lustre/mdt/mdt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/mdt/mdt_handler.c
  32  *
  33  * Lustre Metadata Target (mdt) request handler
  34  *
  35  * Author: Peter Braam <braam@clusterfs.com>
  36  * Author: Andreas Dilger <adilger@clusterfs.com>
  37  * Author: Phil Schwan <phil@clusterfs.com>
  38  * Author: Mike Shaver <shaver@clusterfs.com>
  39  * Author: Nikita Danilov <nikita@clusterfs.com>
  40  * Author: Huang Hua <huanghua@clusterfs.com>
  41  * Author: Yury Umanets <umka@clusterfs.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_MDS
  45
  46 #include <linux/module.h>
  47 #include <linux/pagemap.h>
  48
  49 #include <dt_object.h>
  50 #include <lustre_acl.h>
  51 #include <lustre_export.h>
  52 #include <uapi/linux/lustre/lustre_ioctl.h>
  53 #include <lustre_lfsck.h>
  54 #include <lustre_log.h>
  55 #include <lustre_nodemap.h>
  56 #include <lustre_mds.h>
  57 #include <uapi/linux/lustre/lustre_param.h>
  58 #include <lustre_quota.h>
  59 #include <lustre_swab.h>
  60 #include <lustre_lmv.h>
  61 #include <obd.h>
  62 #include <obd_support.h>
  63 #include <lustre_barrier.h>
  64 #include <obd_cksum.h>
  65 #include <llog_swab.h>
  66 #include <lustre_crypto.h>
  67
  68 #include "mdt_internal.h"
  69
  70 #if OBD_OCD_VERSION(3, 0, 53, 0) > LUSTRE_VERSION_CODE
  71 static int mdt_max_mod_rpcs_per_client_set(const char *val,
  72                                 cfs_kernel_param_arg_t *kp)
  73 {
  74         unsigned int num;
  75         int rc;
  76
  77         rc = kstrtouint(val, 0, &num);
  78         if (rc < 0)
  79                 return rc;
  80
  81         if (num < 1 || num > OBD_MAX_RIF_MAX)
  82                 return -EINVAL;
  83
  84         CWARN("max_mod_rpcs_per_client is deprecated, set mdt.*.max_mod_rpcs_in_flight parameter instead\n");
  85
  86         max_mod_rpcs_per_client = num;
  87         return 0;
  88 }
  89 static const struct kernel_param_ops
  90                                 param_ops_max_mod_rpcs_per_client = {
  91         .set = mdt_max_mod_rpcs_per_client_set,
  92         .get = param_get_uint,
  93 };
  94
  95 #define param_check_max_mod_rpcs_per_client(name, p) \
  96                 __param_check(name, p, unsigned int)
  97
  98 module_param_cb(max_mod_rpcs_per_client,
  99                                 &param_ops_max_mod_rpcs_per_client,
 100                                 &max_mod_rpcs_per_client, 0644);
 101
 102 MODULE_PARM_DESC(max_mod_rpcs_per_client,
 103         "maximum number of modify RPCs in flight allowed per client (Deprecated)");
 104 #endif
 105
 106 mdl_mode_t mdt_mdl_lock_modes[] = {
 107         [LCK_MINMODE] = MDL_MINMODE,
 108         [LCK_EX]      = MDL_EX,
 109         [LCK_PW]      = MDL_PW,
 110         [LCK_PR]      = MDL_PR,
 111         [LCK_CW]      = MDL_CW,
 112         [LCK_CR]      = MDL_CR,
 113         [LCK_NL]      = MDL_NL,
 114         [LCK_GROUP]   = MDL_GROUP
 115 };
 116
 117 enum ldlm_mode mdt_dlm_lock_modes[] = {
 118         [MDL_MINMODE]   = LCK_MINMODE,
 119         [MDL_EX]        = LCK_EX,
 120         [MDL_PW]        = LCK_PW,
 121         [MDL_PR]        = LCK_PR,
 122         [MDL_CW]        = LCK_CW,
 123         [MDL_CR]        = LCK_CR,
 124         [MDL_NL]        = LCK_NL,
 125         [MDL_GROUP]     = LCK_GROUP
 126 };
 127
 128 static struct mdt_device *mdt_dev(struct lu_device *d);
 129
 130 static const struct lu_object_operations mdt_obj_ops;
 131
 132 /* Slab for MDT object allocation */
 133 static struct kmem_cache *mdt_object_kmem;
 134
 135 /* For HSM restore handles */
 136 struct kmem_cache *mdt_hsm_cdt_kmem;
 137
 138 /* For HSM request handles */
 139 struct kmem_cache *mdt_hsm_car_kmem;
 140
 141 static struct lu_kmem_descr mdt_caches[] = {
 142         {
 143                 .ckd_cache = &mdt_object_kmem,
 144                 .ckd_name  = "mdt_obj",
 145                 .ckd_size  = sizeof(struct mdt_object)
 146         },
 147         {
 148                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 149                 .ckd_name       = "mdt_cdt_restore_handle",
 150                 .ckd_size       = sizeof(struct cdt_restore_handle)
 151         },
 152         {
 153                 .ckd_cache      = &mdt_hsm_car_kmem,
 154                 .ckd_name       = "mdt_cdt_agent_req",
 155                 .ckd_size       = sizeof(struct cdt_agent_req)
 156         },
 157         {
 158                 .ckd_cache = NULL
 159         }
 160 };
 161
 162 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 163 {
 164         if (!rep)
 165                 return 0;
 166         return rep->lock_policy_res1 & op_flag;
 167 }
 168
 169 void mdt_clear_disposition(struct mdt_thread_info *info,
 170                            struct ldlm_reply *rep, __u64 op_flag)
 171 {
 172         if (info) {
 173                 info->mti_opdata &= ~op_flag;
 174                 tgt_opdata_clear(info->mti_env, op_flag);
 175         }
 176         if (rep)
 177                 rep->lock_policy_res1 &= ~op_flag;
 178 }
 179
 180 void mdt_set_disposition(struct mdt_thread_info *info,
 181                          struct ldlm_reply *rep, __u64 op_flag)
 182 {
 183         if (info) {
 184                 info->mti_opdata |= op_flag;
 185                 tgt_opdata_set(info->mti_env, op_flag);
 186         }
 187         if (rep)
 188                 rep->lock_policy_res1 |= op_flag;
 189 }
 190
 191 /* assert lock is unlocked before reuse */
 192 static inline void mdt_lock_handle_assert(struct mdt_lock_handle *lh)
 193 {
 194         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
 195         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
 196         LASSERT(!lustre_handle_is_used(&lh->mlh_rreg_lh));
 197 }
 198
 199 void mdt_lock_reg_init(struct mdt_lock_handle *lh, enum ldlm_mode lm)
 200 {
 201         mdt_lock_handle_assert(lh);
 202         lh->mlh_pdo_hash = 0;
 203         lh->mlh_reg_mode = lm;
 204         lh->mlh_rreg_mode = lm;
 205         lh->mlh_type = MDT_REG_LOCK;
 206 }
 207
 208 void mdt_lh_reg_init(struct mdt_lock_handle *lh, struct ldlm_lock *lock)
 209 {
 210         mdt_lock_reg_init(lh, lock->l_req_mode);
 211         if (lock->l_req_mode == LCK_GROUP)
 212                 lh->mlh_gid = lock->l_policy_data.l_inodebits.li_gid;
 213 }
 214
 215 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, enum ldlm_mode lock_mode,
 216                        const struct lu_name *lname)
 217 {
 218         mdt_lock_handle_assert(lh);
 219         lh->mlh_reg_mode = lock_mode;
 220         lh->mlh_pdo_mode = LCK_MINMODE;
 221         lh->mlh_rreg_mode = lock_mode;
 222         lh->mlh_type = MDT_PDO_LOCK;
 223
 224         if (lu_name_is_valid(lname)) {
 225                 lh->mlh_pdo_hash = ll_full_name_hash(NULL, lname->ln_name,
 226                                                      lname->ln_namelen);
 227                 /* XXX Workaround for LU-2856
 228                  *
 229                  * Zero is a valid return value of full_name_hash, but
 230                  * several users of mlh_pdo_hash assume a non-zero
 231                  * hash value. We therefore map zero onto an
 232                  * arbitrary, but consistent value (1) to avoid
 233                  * problems further down the road. */
 234                 if (unlikely(lh->mlh_pdo_hash == 0))
 235                         lh->mlh_pdo_hash = 1;
 236         } else {
 237                 lh->mlh_pdo_hash = 0;
 238         }
 239 }
 240
 241 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 242                               struct mdt_lock_handle *lh)
 243 {
 244         mdl_mode_t mode;
 245         ENTRY;
 246
 247         /*
 248          * Any dir access needs couple of locks:
 249          *
 250          * 1) on part of dir we gonna take lookup/modify;
 251          *
 252          * 2) on whole dir to protect it from concurrent splitting and/or to
 253          * flush client's cache for readdir().
 254          *
 255          * so, for a given mode and object this routine decides what lock mode
 256          * to use for lock #2:
 257          *
 258          * 1) if caller's gonna lookup in dir then we need to protect dir from
 259          * being splitted only - LCK_CR
 260          *
 261          * 2) if caller's gonna modify dir then we need to protect dir from
 262          * being splitted and to flush cache - LCK_CW
 263          *
 264          * 3) if caller's gonna modify dir and that dir seems ready for
 265          * splitting then we need to protect it from any type of access
 266          * (lookup/modify/split) - LCK_EX --bzzz
 267          */
 268
 269         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 270         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 271
 272         /*
 273          * Ask underlaying level its opinion about preferable PDO lock mode
 274          * having access type passed as regular lock mode:
 275          *
 276          * - MDL_MINMODE means that lower layer does not want to specify lock
 277          * mode;
 278          *
 279          * - MDL_NL means that no PDO lock should be taken. This is used in some
 280          * cases. Say, for non-splittable directories no need to use PDO locks
 281          * at all.
 282          */
 283         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 284                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 285
 286         if (mode != MDL_MINMODE) {
 287                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 288         } else {
 289                 /*
 290                  * Lower layer does not want to specify locking mode. We do it
 291                  * our selves. No special protection is needed, just flush
 292                  * client's cache on modification and allow concurrent
 293                  * mondification.
 294                  */
 295                 switch (lh->mlh_reg_mode) {
 296                 case LCK_EX:
 297                         lh->mlh_pdo_mode = LCK_EX;
 298                         break;
 299                 case LCK_PR:
 300                         lh->mlh_pdo_mode = LCK_CR;
 301                         break;
 302                 case LCK_PW:
 303                         lh->mlh_pdo_mode = LCK_CW;
 304                         break;
 305                 default:
 306                         CERROR("Not expected lock type (0x%x)\n",
 307                                (int)lh->mlh_reg_mode);
 308                         LBUG();
 309                 }
 310         }
 311
 312         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 313         EXIT;
 314 }
 315
 316 /**
 317  * Check whether \a o is directory stripe object.
 318  *
 319  * \param[in]  info     thread environment
 320  * \param[in]  o        MDT object
 321  *
 322  * \retval 1    is directory stripe.
 323  * \retval 0    isn't directory stripe.
 324  * \retval < 1  error code
 325  */
 326 static int mdt_is_dir_stripe(struct mdt_thread_info *info,
 327                                 struct mdt_object *o)
 328 {
 329         struct md_attr *ma = &info->mti_attr;
 330         struct lmv_mds_md_v1 *lmv;
 331         int rc;
 332
 333         rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 334         if (rc < 0)
 335                 return rc;
 336
 337         if (!(ma->ma_valid & MA_LMV))
 338                 return 0;
 339
 340         lmv = &ma->ma_lmv->lmv_md_v1;
 341
 342         if (!lmv_is_sane2(lmv))
 343                 return -EBADF;
 344
 345         if (le32_to_cpu(lmv->lmv_magic) == LMV_MAGIC_STRIPE)
 346                 return 1;
 347
 348         return 0;
 349 }
 350
 351 static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 352                               struct lu_fid *fid)
 353 {
 354         struct mdt_device *mdt = info->mti_mdt;
 355         struct lu_name *lname = &info->mti_name;
 356         const char *start = fileset;
 357         char *filename = info->mti_filename;
 358         struct mdt_object *obj;
 359         int rc = 0;
 360
 361         LASSERT(!info->mti_cross_ref);
 362
 363         /*
 364          * We may want to allow this to mount a completely separate
 365          * fileset from the MDT in the future, but keeping it to
 366          * ROOT/ only for now avoid potential security issues.
 367          */
 368         *fid = mdt->mdt_md_root_fid;
 369
 370         while (rc == 0 && start != NULL && *start != '\0') {
 371                 const char *s1 = start;
 372                 const char *s2;
 373
 374                 while (*++s1 == '/')
 375                         ;
 376                 s2 = s1;
 377                 while (*s2 != '/' && *s2 != '\0')
 378                         s2++;
 379
 380                 if (s2 == s1)
 381                         break;
 382
 383                 start = s2;
 384
 385                 lname->ln_namelen = s2 - s1;
 386                 if (lname->ln_namelen > NAME_MAX) {
 387                         rc = -EINVAL;
 388                         break;
 389                 }
 390
 391                 /* reject .. as a path component */
 392                 if (lname->ln_namelen == 2 && strncmp(s1, "..", 2) == 0) {
 393                         rc = -EINVAL;
 394                         break;
 395                 }
 396
 397                 strncpy(filename, s1, lname->ln_namelen);
 398                 filename[lname->ln_namelen] = '\0';
 399                 lname->ln_name = filename;
 400
 401                 obj = mdt_object_find(info->mti_env, mdt, fid);
 402                 if (IS_ERR(obj)) {
 403                         rc = PTR_ERR(obj);
 404                         break;
 405                 }
 406                 /* Only got the fid of this obj by name */
 407                 fid_zero(fid);
 408                 rc = mdo_lookup(info->mti_env, mdt_object_child(obj), lname,
 409                                 fid, &info->mti_spec);
 410                 if (!rc && !S_ISDIR(lu_object_attr(&obj->mot_obj)))
 411                         rc = -ENOTDIR;
 412                 mdt_object_put(info->mti_env, obj);
 413         }
 414
 415         return rc;
 416 }
 417
 418 static int mdt_get_root(struct tgt_session_info *tsi)
 419 {
 420         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 421         struct mdt_device       *mdt = info->mti_mdt;
 422         struct mdt_body         *repbody;
 423         char                    *fileset = NULL, *buffer = NULL;
 424         int                      rc;
 425         struct obd_export       *exp = info->mti_exp;
 426         char                    *nodemap_fileset;
 427
 428         ENTRY;
 429
 430         rc = mdt_check_ucred(info);
 431         if (rc)
 432                 GOTO(out, rc = err_serious(rc));
 433
 434         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_GET_ROOT_PACK))
 435                 GOTO(out, rc = err_serious(-ENOMEM));
 436
 437         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 438         if (req_capsule_get_size(info->mti_pill, &RMF_NAME, RCL_CLIENT) > 0) {
 439                 fileset = req_capsule_client_get(info->mti_pill, &RMF_NAME);
 440                 if (fileset == NULL)
 441                         GOTO(out, rc = err_serious(-EFAULT));
 442         }
 443
 444         nodemap_fileset = nodemap_get_fileset(exp->exp_target_data.ted_nodemap);
 445         if (nodemap_fileset && nodemap_fileset[0]) {
 446                 CDEBUG(D_INFO, "nodemap fileset is %s\n", nodemap_fileset);
 447                 if (fileset) {
 448                         /* consider fileset from client as a sub-fileset
 449                          * of the nodemap one */
 450                         OBD_ALLOC(buffer, PATH_MAX + 1);
 451                         if (buffer == NULL)
 452                                 GOTO(out, rc = err_serious(-ENOMEM));
 453                         if (snprintf(buffer, PATH_MAX + 1, "%s/%s",
 454                                      nodemap_fileset, fileset) >= PATH_MAX + 1)
 455                                 GOTO(out, rc = err_serious(-EINVAL));
 456                         fileset = buffer;
 457                 } else {
 458                         /* enforce fileset as specified in the nodemap */
 459                         fileset = nodemap_fileset;
 460                 }
 461         }
 462
 463         if (fileset) {
 464                 CDEBUG(D_INFO, "Getting fileset %s\n", fileset);
 465                 rc = mdt_lookup_fileset(info, fileset, &repbody->mbo_fid1);
 466                 if (rc < 0)
 467                         GOTO(out, rc = err_serious(rc));
 468         } else {
 469                 repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 470         }
 471         exp->exp_root_fid = repbody->mbo_fid1;
 472         repbody->mbo_valid |= OBD_MD_FLID;
 473
 474         EXIT;
 475 out:
 476         mdt_thread_info_fini(info);
 477         if (buffer)
 478                 OBD_FREE(buffer, PATH_MAX+1);
 479         return rc;
 480 }
 481
 482 static int mdt_statfs(struct tgt_session_info *tsi)
 483 {
 484         struct ptlrpc_request *req = tgt_ses_req(tsi);
 485         struct mdt_thread_info *info = tsi2mdt_info(tsi);
 486         struct mdt_device *mdt = info->mti_mdt;
 487         struct tg_grants_data *tgd = &mdt->mdt_lut.lut_tgd;
 488         struct md_device *next = mdt->mdt_child;
 489         struct ptlrpc_service_part *svcpt;
 490         struct obd_statfs *osfs;
 491         struct mdt_body *reqbody = NULL;
 492         struct mdt_statfs_cache *msf;
 493         ktime_t kstart = ktime_get();
 494         int current_blockbits;
 495         int rc;
 496         timeout_t at_est;
 497
 498         ENTRY;
 499
 500         svcpt = req->rq_rqbd->rqbd_svcpt;
 501
 502         /* This will trigger a watchdog timeout */
 503         at_est = obd_at_get(mdt->mdt_lu_dev.ld_obd, &svcpt->scp_at_estimate);
 504         CFS_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 505                          (MDT_SERVICE_WATCHDOG_FACTOR * at_est) + 1);
 506
 507         rc = mdt_check_ucred(info);
 508         if (rc)
 509                 GOTO(out, rc = err_serious(rc));
 510
 511         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 512                 GOTO(out, rc = err_serious(-ENOMEM));
 513
 514         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 515         if (!osfs)
 516                 GOTO(out, rc = -EPROTO);
 517
 518         if (mdt_is_sum_statfs_client(req->rq_export) &&
 519                 lustre_packed_msg_size(req->rq_reqmsg) ==
 520                 req_capsule_fmt_size(req->rq_reqmsg->lm_magic,
 521                                      &RQF_MDS_STATFS_NEW, RCL_CLIENT)) {
 522                 req_capsule_extend(info->mti_pill, &RQF_MDS_STATFS_NEW);
 523                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
 524         }
 525
 526         if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
 527                 msf = &mdt->mdt_sum_osfs;
 528         else
 529                 msf = &mdt->mdt_osfs;
 530
 531         if (msf->msf_age + OBD_STATFS_CACHE_SECONDS <= ktime_get_seconds()) {
 532                         /** statfs data is too old, get up-to-date one */
 533                         if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
 534                                 rc = next->md_ops->mdo_statfs(info->mti_env,
 535                                                               next, osfs);
 536                         else
 537                                 rc = dt_statfs(info->mti_env, mdt->mdt_bottom,
 538                                                osfs);
 539                         if (rc)
 540                                 GOTO(out, rc);
 541                         spin_lock(&mdt->mdt_lock);
 542                         msf->msf_osfs = *osfs;
 543                         msf->msf_age = ktime_get_seconds();
 544                         spin_unlock(&mdt->mdt_lock);
 545         } else {
 546                         /** use cached statfs data */
 547                         spin_lock(&mdt->mdt_lock);
 548                         *osfs = msf->msf_osfs;
 549                         spin_unlock(&mdt->mdt_lock);
 550         }
 551
 552         /* tgd_blockbit is recordsize bits set during mkfs.
 553          * This once set does not change. However, 'zfs set'
 554          * can be used to change the MDT blocksize. Instead
 555          * of using cached value of 'tgd_blockbit' always
 556          * calculate the blocksize bits which may have
 557          * changed.
 558          */
 559         current_blockbits = fls64(osfs->os_bsize) - 1;
 560
 561         /* at least try to account for cached pages.  its still racy and
 562          * might be under-reporting if clients haven't announced their
 563          * caches with brw recently */
 564         CDEBUG(D_SUPER | D_CACHE, "blocks cached %llu granted %llu"
 565                " pending %llu free %llu avail %llu\n",
 566                tgd->tgd_tot_dirty, tgd->tgd_tot_granted,
 567                tgd->tgd_tot_pending,
 568                osfs->os_bfree << current_blockbits,
 569                osfs->os_bavail << current_blockbits);
 570
 571         osfs->os_bavail -= min_t(u64, osfs->os_bavail,
 572                                  ((tgd->tgd_tot_dirty + tgd->tgd_tot_pending +
 573                                    osfs->os_bsize - 1) >> current_blockbits));
 574
 575         tgt_grant_sanity_check(mdt->mdt_lu_dev.ld_obd, __func__);
 576         if (mdt->mdt_lut.lut_no_create)
 577                 osfs->os_state |= OS_STATFS_NOCREATE;
 578         CDEBUG(D_CACHE, "%llu blocks: %llu free, %llu avail; "
 579                "%llu objects: %llu free; state %x\n",
 580                osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
 581                osfs->os_files, osfs->os_ffree, osfs->os_state);
 582
 583         if (!exp_grant_param_supp(tsi->tsi_exp) &&
 584             current_blockbits > COMPAT_BSIZE_SHIFT) {
 585                 /* clients which don't support OBD_CONNECT_GRANT_PARAM
 586                  * should not see a block size > page size, otherwise
 587                  * cl_lost_grant goes mad. Therefore, we emulate a 4KB (=2^12)
 588                  * block size which is the biggest block size known to work
 589                  * with all client's page size. */
 590                 osfs->os_blocks <<= current_blockbits - COMPAT_BSIZE_SHIFT;
 591                 osfs->os_bfree  <<= current_blockbits - COMPAT_BSIZE_SHIFT;
 592                 osfs->os_bavail <<= current_blockbits - COMPAT_BSIZE_SHIFT;
 593                 osfs->os_bsize = 1 << COMPAT_BSIZE_SHIFT;
 594         }
 595         if (rc == 0)
 596                 mdt_counter_incr(req, LPROC_MDT_STATFS,
 597                                  ktime_us_delta(ktime_get(), kstart));
 598 out:
 599         mdt_thread_info_fini(info);
 600         RETURN(rc);
 601 }
 602
 603 __u32 mdt_lmm_dom_entry_check(struct lov_mds_md *lmm, int *is_dom_only)
 604 {
 605         struct lov_comp_md_v1 *comp_v1;
 606         struct lov_mds_md *v1;
 607         __u32 off;
 608         __u32 dom_stripesize = 0;
 609         int i;
 610         bool has_ost_stripes = false;
 611
 612         ENTRY;
 613
 614         if (is_dom_only)
 615                 *is_dom_only = 0;
 616
 617         if (le32_to_cpu(lmm->lmm_magic) != LOV_MAGIC_COMP_V1)
 618                 RETURN(0);
 619
 620         comp_v1 = (struct lov_comp_md_v1 *)lmm;
 621         off = le32_to_cpu(comp_v1->lcm_entries[0].lcme_offset);
 622         v1 = (struct lov_mds_md *)((char *)comp_v1 + off);
 623
 624         /* Fast check for DoM entry with no mirroring, should be the first */
 625         if (le16_to_cpu(comp_v1->lcm_mirror_count) == 0 &&
 626             !(lov_pattern(le32_to_cpu(v1->lmm_pattern)) & LOV_PATTERN_MDT))
 627                 RETURN(0);
 628
 629         /* check all entries otherwise */
 630         for (i = 0; i < le16_to_cpu(comp_v1->lcm_entry_count); i++) {
 631                 struct lov_comp_md_entry_v1 *lcme;
 632
 633                 lcme = &comp_v1->lcm_entries[i];
 634                 if (!(le32_to_cpu(lcme->lcme_flags) & LCME_FL_INIT))
 635                         continue;
 636
 637                 off = le32_to_cpu(lcme->lcme_offset);
 638                 v1 = (struct lov_mds_md *)((char *)comp_v1 + off);
 639
 640                 if (lov_pattern(le32_to_cpu(v1->lmm_pattern)) &
 641                     LOV_PATTERN_MDT)
 642                         dom_stripesize = le32_to_cpu(v1->lmm_stripe_size);
 643                 else
 644                         has_ost_stripes = true;
 645
 646                 if (dom_stripesize && has_ost_stripes)
 647                         RETURN(dom_stripesize);
 648         }
 649         /* DoM-only case exits here */
 650         if (is_dom_only && dom_stripesize)
 651                 *is_dom_only = 1;
 652         RETURN(dom_stripesize);
 653 }
 654
 655 /**
 656  * Pack size attributes into the reply.
 657  */
 658 int mdt_pack_size2body(struct mdt_thread_info *info,
 659                         const struct lu_fid *fid, struct lustre_handle *lh)
 660 {
 661         struct mdt_body *b;
 662         struct md_attr *ma = &info->mti_attr;
 663         __u32 dom_stripe;
 664         bool dom_lock = false;
 665
 666         ENTRY;
 667
 668         LASSERT(ma->ma_attr.la_valid & LA_MODE);
 669
 670         if (!S_ISREG(ma->ma_attr.la_mode) ||
 671             !(ma->ma_valid & MA_LOV && ma->ma_lmm != NULL))
 672                 RETURN(-ENODATA);
 673
 674         dom_stripe = mdt_lmm_dom_stripesize(ma->ma_lmm);
 675         /* no DoM stripe, no size in reply */
 676         if (!dom_stripe)
 677                 RETURN(-ENOENT);
 678
 679         if (lustre_handle_is_used(lh)) {
 680                 struct ldlm_lock *lock;
 681
 682                 lock = ldlm_handle2lock(lh);
 683                 if (lock != NULL) {
 684                         dom_lock = ldlm_has_dom(lock);
 685                         LDLM_LOCK_PUT(lock);
 686                 }
 687         }
 688
 689         /* no DoM lock, no size in reply */
 690         if (!dom_lock)
 691                 RETURN(0);
 692
 693         /* Either DoM lock exists or LMM has only DoM stripe then
 694          * return size on body. */
 695         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 696
 697         mdt_dom_object_size(info->mti_env, info->mti_mdt, fid, b, dom_lock);
 698         RETURN(0);
 699 }
 700
 701 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
 702 /*
 703  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 704  *
 705  * \param       info    thread info object
 706  * \param       repbody reply to pack ACLs into
 707  * \param       o       mdt object of file to examine
 708  * \param       nodemap nodemap of client to reply to
 709  * \retval      0       success
 710  * \retval      -errno  error getting or parsing ACL from disk
 711  */
 712 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 713                       struct mdt_object *o, struct lu_nodemap *nodemap)
 714 {
 715         const struct lu_env     *env = info->mti_env;
 716         struct md_object        *next = mdt_object_child(o);
 717         struct lu_buf           *buf = &info->mti_buf;
 718         struct mdt_device       *mdt = info->mti_mdt;
 719         struct req_capsule *pill = info->mti_pill;
 720         int rc;
 721
 722         ENTRY;
 723
 724         buf->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 725         buf->lb_len = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
 726         if (buf->lb_len == 0)
 727                 RETURN(0);
 728
 729         LASSERT(!info->mti_big_acl_used);
 730 again:
 731         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 732         if (rc < 0) {
 733                 if (rc == -ENODATA) {
 734                         repbody->mbo_aclsize = 0;
 735                         repbody->mbo_valid |= OBD_MD_FLACL;
 736                         rc = 0;
 737                 } else if (rc == -EOPNOTSUPP) {
 738                         rc = 0;
 739                 } else if (rc == -ERANGE) {
 740                         if (exp_connect_large_acl(info->mti_exp) &&
 741                             !info->mti_big_acl_used) {
 742                                 if (info->mti_big_acl == NULL) {
 743                                         info->mti_big_aclsize =
 744                                                         min_t(unsigned int,
 745                                                               mdt->mdt_max_ea_size,
 746                                                               XATTR_SIZE_MAX);
 747                                         OBD_ALLOC_LARGE(info->mti_big_acl,
 748                                                         info->mti_big_aclsize);
 749                                         if (info->mti_big_acl == NULL) {
 750                                                 info->mti_big_aclsize = 0;
 751                                                 CERROR("%s: unable to grow "
 752                                                        DFID" ACL buffer\n",
 753                                                        mdt_obd_name(mdt),
 754                                                        PFID(mdt_object_fid(o)));
 755                                                 RETURN(-ENOMEM);
 756                                         }
 757                                 }
 758
 759                                 CDEBUG(D_INODE, "%s: grow the "DFID
 760                                        " ACL buffer to size %d\n",
 761                                        mdt_obd_name(mdt),
 762                                        PFID(mdt_object_fid(o)),
 763                                        info->mti_big_aclsize);
 764
 765                                 buf->lb_buf = info->mti_big_acl;
 766                                 buf->lb_len = info->mti_big_aclsize;
 767                                 info->mti_big_acl_used = 1;
 768                                 goto again;
 769                         }
 770                         /* FS has ACL bigger that our limits */
 771                         CDEBUG(D_INODE, "%s: "DFID" ACL can't fit into %d\n",
 772                                mdt_obd_name(mdt), PFID(mdt_object_fid(o)),
 773                                info->mti_big_aclsize);
 774                         rc = -E2BIG;
 775                 } else {
 776                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 777                                mdt_obd_name(mdt), PFID(mdt_object_fid(o)), rc);
 778                 }
 779         } else {
 780                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 781                                      rc, NODEMAP_FS_TO_CLIENT);
 782                 /* if all ACLs mapped out, rc is still >= 0 */
 783                 if (rc < 0) {
 784                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 785                                " ACL: rc = %d\n", mdt_obd_name(mdt),
 786                                PFID(mdt_object_fid(o)), rc);
 787                         repbody->mbo_aclsize = 0;
 788                         repbody->mbo_valid &= ~OBD_MD_FLACL;
 789                 } else {
 790                         repbody->mbo_aclsize = rc;
 791                         repbody->mbo_valid |= OBD_MD_FLACL;
 792                         rc = 0;
 793                 }
 794         }
 795
 796         RETURN(rc);
 797 }
 798 #endif
 799
 800 /* XXX Look into layout in MDT layer. */
 801 static inline bool mdt_hsm_is_released(struct lov_mds_md *lmm)
 802 {
 803         struct lov_comp_md_v1   *comp_v1;
 804         struct lov_mds_md       *v1;
 805         int                      i;
 806
 807         if (lmm->lmm_magic == LOV_MAGIC_COMP_V1) {
 808                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
 809
 810                 for (i = 0; i < comp_v1->lcm_entry_count; i++) {
 811                         v1 = (struct lov_mds_md *)((char *)comp_v1 +
 812                                 comp_v1->lcm_entries[i].lcme_offset);
 813                         /* We don't support partial release for now */
 814                         if (!(v1->lmm_pattern & LOV_PATTERN_F_RELEASED))
 815                                 return false;
 816                 }
 817                 return true;
 818         } else {
 819                 return (lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) ?
 820                         true : false;
 821         }
 822 }
 823
 824 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 825                         const struct lu_attr *attr, const struct lu_fid *fid)
 826 {
 827         struct mdt_device *mdt = info->mti_mdt;
 828         struct obd_export *exp = info->mti_exp;
 829         struct md_attr *ma = &info->mti_attr;
 830         struct lu_nodemap *nodemap = NULL;
 831
 832         LASSERT(ma->ma_valid & MA_INODE);
 833
 834         if (attr->la_valid & LA_ATIME) {
 835                 b->mbo_atime = attr->la_atime;
 836                 b->mbo_valid |= OBD_MD_FLATIME;
 837         }
 838         if (attr->la_valid & LA_MTIME) {
 839                 b->mbo_mtime = attr->la_mtime;
 840                 b->mbo_valid |= OBD_MD_FLMTIME;
 841         }
 842         if (attr->la_valid & LA_CTIME) {
 843                 b->mbo_ctime = attr->la_ctime;
 844                 b->mbo_valid |= OBD_MD_FLCTIME;
 845         }
 846         if (attr->la_valid & LA_BTIME) {
 847                 b->mbo_btime = attr->la_btime;
 848                 b->mbo_valid |= OBD_MD_FLBTIME;
 849         }
 850         if (attr->la_valid & LA_FLAGS) {
 851                 b->mbo_flags = attr->la_flags;
 852                 b->mbo_valid |= OBD_MD_FLFLAGS;
 853         }
 854         if (attr->la_valid & LA_NLINK) {
 855                 b->mbo_nlink = attr->la_nlink;
 856                 b->mbo_valid |= OBD_MD_FLNLINK;
 857         }
 858         if (attr->la_valid & (LA_UID|LA_GID|LA_PROJID)) {
 859                 nodemap = nodemap_get_from_exp(exp);
 860                 if (IS_ERR(nodemap))
 861                         goto out;
 862         }
 863         if (attr->la_valid & LA_UID) {
 864                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 865                                             NODEMAP_FS_TO_CLIENT,
 866                                             attr->la_uid);
 867                 b->mbo_valid |= OBD_MD_FLUID;
 868         }
 869         if (attr->la_valid & LA_GID) {
 870                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 871                                             NODEMAP_FS_TO_CLIENT,
 872                                             attr->la_gid);
 873                 b->mbo_valid |= OBD_MD_FLGID;
 874         }
 875
 876         if (attr->la_valid & LA_PROJID) {
 877                 b->mbo_projid = nodemap_map_id(nodemap, NODEMAP_PROJID,
 878                                                NODEMAP_FS_TO_CLIENT,
 879                                                attr->la_projid);
 880                 b->mbo_valid |= OBD_MD_FLPROJID;
 881         }
 882
 883         b->mbo_mode = attr->la_mode;
 884         if (attr->la_valid & LA_MODE)
 885                 b->mbo_valid |= OBD_MD_FLMODE;
 886         if (attr->la_valid & LA_TYPE)
 887                 b->mbo_valid |= OBD_MD_FLTYPE;
 888
 889         if (fid != NULL) {
 890                 b->mbo_fid1 = *fid;
 891                 b->mbo_valid |= OBD_MD_FLID;
 892                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid=%#llx\n",
 893                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 894         }
 895
 896         if (!(attr->la_valid & LA_TYPE))
 897                 return;
 898
 899         b->mbo_rdev   = attr->la_rdev;
 900         b->mbo_size   = attr->la_size;
 901         b->mbo_blocks = attr->la_blocks;
 902
 903         if (!S_ISREG(attr->la_mode)) {
 904                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 905         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 906                 /* means no objects are allocated on osts. */
 907                 LASSERT(!(ma->ma_valid & MA_LOV));
 908                 /* just ignore blocks occupied by extend attributes on MDS */
 909                 b->mbo_blocks = 0;
 910                 /* if no object is allocated on osts, the size on mds is valid.
 911                  * b=22272 */
 912                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 913         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL) {
 914                 if (mdt_hsm_is_released(ma->ma_lmm)) {
 915                         /* A released file stores its size on MDS. */
 916                         /* But return 1 block for released file, unless tools
 917                          * like tar will consider it fully sparse. (LU-3864)
 918                          */
 919                         if (unlikely(b->mbo_size == 0))
 920                                 b->mbo_blocks = 0;
 921                         else
 922                                 b->mbo_blocks = 1;
 923                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 924                 } else if (info->mti_som_strict &&
 925                            mdt->mdt_opts.mo_enable_strict_som) {
 926                         /* use SOM for size*/
 927                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 928                 } else if (ma->ma_valid & MA_SOM) { /* lsom is valid */
 929                         b->mbo_valid |= OBD_MD_FLLAZYSIZE | OBD_MD_FLLAZYBLOCKS;
 930                         b->mbo_size = ma->ma_som.ms_size;
 931                         b->mbo_blocks = ma->ma_som.ms_blocks;
 932                 }
 933         }
 934
 935         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE ||
 936                             b->mbo_valid & OBD_MD_FLLAZYSIZE))
 937                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 938                        PFID(fid), (unsigned long long)b->mbo_size);
 939
 940 out:
 941         if (!IS_ERR_OR_NULL(nodemap))
 942                 nodemap_putref(nodemap);
 943 }
 944
 945 static inline int mdt_body_has_lov(const struct lu_attr *la,
 946                                    const struct mdt_body *body)
 947 {
 948         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 949                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 950 }
 951
 952 void mdt_client_compatibility(struct mdt_thread_info *info)
 953 {
 954         struct mdt_body       *body;
 955         struct ptlrpc_request *req = mdt_info_req(info);
 956         struct obd_export     *exp = req->rq_export;
 957         struct md_attr        *ma = &info->mti_attr;
 958         struct lu_attr        *la = &ma->ma_attr;
 959         ENTRY;
 960
 961         if (exp_connect_layout(exp))
 962                 /* the client can deal with 16-bit lmm_stripe_count */
 963                 RETURN_EXIT;
 964
 965         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 966
 967         if (!mdt_body_has_lov(la, body))
 968                 RETURN_EXIT;
 969
 970         /* now we have a reply with a lov for a client not compatible with the
 971          * layout lock so we have to clean the layout generation number */
 972         if (S_ISREG(la->la_mode))
 973                 ma->ma_lmm->lmm_layout_gen = 0;
 974         EXIT;
 975 }
 976
 977 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 978                                    struct mdt_object *o)
 979 {
 980         const struct lu_env *env = info->mti_env;
 981         int rc, rc2;
 982
 983         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 984                           XATTR_NAME_LOV);
 985
 986         if (rc == -ENODATA)
 987                 rc = 0;
 988
 989         if (rc < 0)
 990                 goto out;
 991
 992         /* Is it a directory? Let's check for the LMV as well */
 993         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 994                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 995                                    XATTR_NAME_LMV);
 996
 997                 if (rc2 == -ENODATA)
 998                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 999                                            &LU_BUF_NULL,
1000                                            XATTR_NAME_DEFAULT_LMV);
1001
1002                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
1003                         rc = rc2;
1004         }
1005
1006 out:
1007         return rc;
1008 }
1009
1010 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
1011                       const char *name)
1012 {
1013         const struct lu_env *env = info->mti_env;
1014         int rc;
1015         ENTRY;
1016
1017         LASSERT(info->mti_big_lmm_used == 0);
1018         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
1019         if (rc < 0)
1020                 RETURN(rc);
1021
1022         /* big_lmm may need to be grown */
1023         if (info->mti_big_lmmsize < rc) {
1024                 int size = size_roundup_power2(rc);
1025
1026                 if (info->mti_big_lmmsize > 0) {
1027                         /* free old buffer */
1028                         LASSERT(info->mti_big_lmm);
1029                         OBD_FREE_LARGE(info->mti_big_lmm,
1030                                        info->mti_big_lmmsize);
1031                         info->mti_big_lmm = NULL;
1032                         info->mti_big_lmmsize = 0;
1033                 }
1034
1035                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
1036                 if (info->mti_big_lmm == NULL)
1037                         RETURN(-ENOMEM);
1038                 info->mti_big_lmmsize = size;
1039         }
1040         LASSERT(info->mti_big_lmmsize >= rc);
1041
1042         info->mti_buf.lb_buf = info->mti_big_lmm;
1043         info->mti_buf.lb_len = info->mti_big_lmmsize;
1044         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
1045
1046         RETURN(rc);
1047 }
1048
1049 int __mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
1050                      struct md_attr *ma, const char *name)
1051 {
1052         struct md_object *next = mdt_object_child(o);
1053         struct lu_buf    *buf = &info->mti_buf;
1054         int rc;
1055
1056         if (strcmp(name, XATTR_NAME_LOV) == 0) {
1057                 buf->lb_buf = ma->ma_lmm;
1058                 buf->lb_len = ma->ma_lmm_size;
1059                 LASSERT(!(ma->ma_valid & MA_LOV));
1060         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
1061                 buf->lb_buf = ma->ma_lmv;
1062                 buf->lb_len = ma->ma_lmv_size;
1063                 LASSERT(!(ma->ma_valid & MA_LMV));
1064         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
1065                 buf->lb_buf = ma->ma_default_lmv;
1066                 buf->lb_len = ma->ma_default_lmv_size;
1067                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
1068         } else {
1069                 return -EINVAL;
1070         }
1071
1072         LASSERT(buf->lb_buf);
1073
1074         if (!mdt_object_exists(o))
1075                 return -ENOENT;
1076
1077         if (mdt_object_remote(o) && S_ISDIR(lu_object_attr(&o->mot_obj)))
1078                 /* force reload layout for remote dir in case layout changed */
1079                 mo_invalidate(info->mti_env, mdt_object_child(o));
1080
1081         rc = mo_xattr_get(info->mti_env, next, buf, name);
1082         if (rc > 0) {
1083
1084 got:
1085                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
1086                         if (info->mti_big_lmm_used)
1087                                 ma->ma_lmm = info->mti_big_lmm;
1088
1089                         /* NOT return LOV EA with hole to old client. */
1090                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
1091                                      LOV_PATTERN_F_HOLE) &&
1092                             !(exp_connect_flags(info->mti_exp) &
1093                               OBD_CONNECT_LFSCK)) {
1094                                 return -EIO;
1095                         } else {
1096                                 ma->ma_lmm_size = rc;
1097                                 ma->ma_valid |= MA_LOV;
1098                         }
1099                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
1100                         if (info->mti_big_lmm_used)
1101                                 ma->ma_lmv = info->mti_big_lmm;
1102
1103                         ma->ma_lmv_size = rc;
1104                         ma->ma_valid |= MA_LMV;
1105                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
1106                         ma->ma_default_lmv_size = rc;
1107                         ma->ma_valid |= MA_LMV_DEF;
1108                 }
1109
1110                 /* Update mdt_max_mdsize so all clients will be aware that */
1111                 if (info->mti_mdt->mdt_max_mdsize < rc)
1112                         info->mti_mdt->mdt_max_mdsize = rc;
1113
1114                 rc = 0;
1115         } else if (rc == -ENODATA) {
1116                 /* no LOV EA */
1117                 rc = 0;
1118         } else if (rc == -ERANGE) {
1119                 /* Default LMV has fixed size, so it must be able to fit
1120                  * in the original buffer */
1121                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
1122                         return rc;
1123                 rc = mdt_big_xattr_get(info, o, name);
1124                 if (rc > 0) {
1125                         info->mti_big_lmm_used = 1;
1126                         goto got;
1127                 }
1128         }
1129
1130         return rc;
1131 }
1132
1133 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
1134                    struct md_attr *ma, const char *name)
1135 {
1136         int rc;
1137
1138         if (!info->mti_big_lmm) {
1139                 OBD_ALLOC(info->mti_big_lmm, PAGE_SIZE);
1140                 if (!info->mti_big_lmm)
1141                         return -ENOMEM;
1142                 info->mti_big_lmmsize = PAGE_SIZE;
1143         }
1144
1145         if (strcmp(name, XATTR_NAME_LOV) == 0) {
1146                 ma->ma_lmm = info->mti_big_lmm;
1147                 ma->ma_lmm_size = info->mti_big_lmmsize;
1148                 ma->ma_valid &= ~MA_LOV;
1149         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
1150                 ma->ma_lmv = info->mti_big_lmm;
1151                 ma->ma_lmv_size = info->mti_big_lmmsize;
1152                 ma->ma_valid &= ~MA_LMV;
1153         } else {
1154                 LBUG();
1155         }
1156
1157         LASSERT(!info->mti_big_lmm_used);
1158         rc = __mdt_stripe_get(info, o, ma, name);
1159         /* since big_lmm is always used here, clear 'used' flag to avoid
1160          * assertion in mdt_big_xattr_get().
1161          */
1162         info->mti_big_lmm_used = 0;
1163
1164         return rc;
1165 }
1166
1167 int mdt_attr_get_pfid(struct mdt_thread_info *info, struct mdt_object *o,
1168                       struct lu_fid *pfid)
1169 {
1170         struct lu_buf           *buf = &info->mti_buf;
1171         struct link_ea_header   *leh;
1172         struct link_ea_entry    *lee;
1173         int                      rc;
1174         ENTRY;
1175
1176         buf->lb_buf = info->mti_big_lmm;
1177         buf->lb_len = info->mti_big_lmmsize;
1178         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
1179                           buf, XATTR_NAME_LINK);
1180         /* ignore errors, MA_PFID won't be set and it is
1181          * up to the caller to treat this as an error */
1182         if (rc == -ERANGE || buf->lb_len == 0) {
1183                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
1184                 buf->lb_buf = info->mti_big_lmm;
1185                 buf->lb_len = info->mti_big_lmmsize;
1186         }
1187
1188         if (rc < 0)
1189                 RETURN(rc);
1190         if (rc < sizeof(*leh)) {
1191                 CERROR("short LinkEA on "DFID": rc = %d\n",
1192                        PFID(mdt_object_fid(o)), rc);
1193                 RETURN(-ENODATA);
1194         }
1195
1196         leh = (struct link_ea_header *) buf->lb_buf;
1197         lee = (struct link_ea_entry *)(leh + 1);
1198         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
1199                 leh->leh_magic = LINK_EA_MAGIC;
1200                 leh->leh_reccount = __swab32(leh->leh_reccount);
1201                 leh->leh_len = __swab64(leh->leh_len);
1202         }
1203         if (leh->leh_magic != LINK_EA_MAGIC)
1204                 RETURN(-EINVAL);
1205         if (leh->leh_reccount == 0)
1206                 RETURN(-ENODATA);
1207
1208         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
1209         fid_be_to_cpu(pfid, pfid);
1210
1211         RETURN(0);
1212 }
1213
1214 int mdt_attr_get_pfid_name(struct mdt_thread_info *info, struct mdt_object *o,
1215                            struct lu_fid *pfid, struct lu_name *lname)
1216 {
1217         struct lu_buf *buf = &info->mti_buf;
1218         struct link_ea_header *leh;
1219         struct link_ea_entry *lee;
1220         int reclen;
1221         int rc;
1222
1223         buf->lb_buf = info->mti_xattr_buf;
1224         buf->lb_len = sizeof(info->mti_xattr_buf);
1225         rc = mo_xattr_get(info->mti_env, mdt_object_child(o), buf,
1226                           XATTR_NAME_LINK);
1227         if (rc == -ERANGE) {
1228                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
1229                 buf->lb_buf = info->mti_big_lmm;
1230                 buf->lb_len = info->mti_big_lmmsize;
1231         }
1232         if (rc < 0)
1233                 return rc;
1234
1235         if (rc < sizeof(*leh)) {
1236                 CERROR("short LinkEA on "DFID": rc = %d\n",
1237                        PFID(mdt_object_fid(o)), rc);
1238                 return -ENODATA;
1239         }
1240
1241         leh = (struct link_ea_header *)buf->lb_buf;
1242         lee = (struct link_ea_entry *)(leh + 1);
1243         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
1244                 leh->leh_magic = LINK_EA_MAGIC;
1245                 leh->leh_reccount = __swab32(leh->leh_reccount);
1246                 leh->leh_len = __swab64(leh->leh_len);
1247         }
1248         if (leh->leh_magic != LINK_EA_MAGIC)
1249                 return -EINVAL;
1250
1251         if (leh->leh_reccount == 0)
1252                 return -ENODATA;
1253
1254         linkea_entry_unpack(lee, &reclen, lname, pfid);
1255
1256         return 0;
1257 }
1258
1259 int mdt_attr_get_complex(struct mdt_thread_info *info,
1260                          struct mdt_object *o, struct md_attr *ma)
1261 {
1262         const struct lu_env *env = info->mti_env;
1263         struct md_object    *next = mdt_object_child(o);
1264         struct lu_buf       *buf = &info->mti_buf;
1265         int                  need = ma->ma_need;
1266         int                  rc = 0, rc2;
1267         u32                  mode;
1268         ENTRY;
1269
1270         ma->ma_valid = 0;
1271
1272         if (mdt_object_exists(o) == 0)
1273                 GOTO(out, rc = -ENOENT);
1274         mode = lu_object_attr(&next->mo_lu);
1275
1276         if (need & MA_INODE) {
1277                 ma->ma_need = MA_INODE;
1278                 if (need & MA_DIRENT_CNT)
1279                         ma->ma_attr.la_valid |= LA_DIRENT_CNT;
1280                 else
1281                         ma->ma_attr.la_valid &= ~LA_DIRENT_CNT;
1282                 rc = mo_attr_get(env, next, ma);
1283                 if (rc)
1284                         GOTO(out, rc);
1285
1286                 if (S_ISREG(mode))
1287                         (void) mdt_get_som(info, o, ma);
1288                 ma->ma_valid |= MA_INODE;
1289         }
1290
1291         if (need & MA_PFID) {
1292                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
1293                 if (rc == 0)
1294                         ma->ma_valid |= MA_PFID;
1295                 /* ignore this error, parent fid is not mandatory */
1296                 rc = 0;
1297         }
1298
1299         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
1300                 rc = __mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
1301                 if (rc)
1302                         GOTO(out, rc);
1303         }
1304
1305         if (need & MA_LMV && S_ISDIR(mode)) {
1306                 rc = __mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
1307                 if (rc != 0)
1308                         GOTO(out, rc);
1309         }
1310
1311         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
1312                 rc = __mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
1313                 if (rc != 0)
1314                         GOTO(out, rc);
1315         }
1316
1317         /*
1318          * In the handle of MA_INODE, we may already get the SOM attr.
1319          */
1320         if (need & MA_SOM && S_ISREG(mode) && !(ma->ma_valid & MA_SOM)) {
1321                 rc = mdt_get_som(info, o, ma);
1322                 if (rc != 0)
1323                         GOTO(out, rc);
1324         }
1325
1326         if (need & MA_HSM && S_ISREG(mode)) {
1327                 buf->lb_buf = info->mti_xattr_buf;
1328                 buf->lb_len = sizeof(info->mti_xattr_buf);
1329                 BUILD_BUG_ON(sizeof(struct hsm_attrs) >
1330                              sizeof(info->mti_xattr_buf));
1331                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
1332                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
1333                 if (rc2 == 0)
1334                         ma->ma_valid |= MA_HSM;
1335                 else if (rc2 < 0 && rc2 != -ENODATA)
1336                         GOTO(out, rc = rc2);
1337         }
1338
1339 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
1340         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
1341                 buf->lb_buf = ma->ma_acl;
1342                 buf->lb_len = ma->ma_acl_size;
1343                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
1344                 if (rc2 > 0) {
1345                         ma->ma_acl_size = rc2;
1346                         ma->ma_valid |= MA_ACL_DEF;
1347                 } else if (rc2 == -ENODATA) {
1348                         /* no ACLs */
1349                         ma->ma_acl_size = 0;
1350                 } else
1351                         GOTO(out, rc = rc2);
1352         }
1353 #endif
1354 out:
1355         ma->ma_need = need;
1356         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = %#llx ma_lmm=%p\n",
1357                rc, ma->ma_valid, ma->ma_lmm);
1358         RETURN(rc);
1359 }
1360
1361 static void mdt_preset_encctx_size(struct mdt_thread_info *info)
1362 {
1363         struct req_capsule *pill = info->mti_pill;
1364
1365         ENTRY;
1366         if (req_capsule_has_field(pill, &RMF_FILE_ENCCTX,
1367                                   RCL_SERVER))
1368                 /* pre-set size in server part with max size */
1369                 req_capsule_set_size(pill, &RMF_FILE_ENCCTX,
1370                                      RCL_SERVER,
1371                                      info->mti_mdt->mdt_max_mdsize);
1372         EXIT;
1373 }
1374
1375 static int mdt_getattr_internal(struct mdt_thread_info *info,
1376                                 struct mdt_object *o, int ma_need)
1377 {
1378         struct mdt_device *mdt = info->mti_mdt;
1379         struct md_object *next = mdt_object_child(o);
1380         const struct mdt_body *reqbody = info->mti_body;
1381         struct ptlrpc_request *req = mdt_info_req(info);
1382         struct md_attr *ma = &info->mti_attr;
1383         struct lu_attr *la = &ma->ma_attr;
1384         struct req_capsule *pill = info->mti_pill;
1385         const struct lu_env *env = info->mti_env;
1386         struct mdt_body *repbody;
1387         struct lu_buf *buffer = &info->mti_buf;
1388         struct obd_export *exp = info->mti_exp;
1389         ktime_t kstart = ktime_get();
1390         int rc;
1391
1392         ENTRY;
1393
1394         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
1395                 RETURN(err_serious(-ENOMEM));
1396
1397         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1398
1399         ma->ma_valid = 0;
1400
1401         if (mdt_object_remote(o)) {
1402                 /* This object is located on remote node.*/
1403                 /* Return -ENOTSUPP for old client */
1404                 if (!mdt_is_dne_client(req->rq_export))
1405                         GOTO(out, rc = -ENOTSUPP);
1406
1407                 repbody->mbo_fid1 = *mdt_object_fid(o);
1408                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
1409                 GOTO(out, rc = 0);
1410         }
1411
1412         if (reqbody->mbo_eadatasize > 0) {
1413                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
1414                 if (buffer->lb_buf == NULL)
1415                         GOTO(out, rc = -EPROTO);
1416                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
1417                                                       RCL_SERVER);
1418         } else {
1419                 buffer->lb_buf = NULL;
1420                 buffer->lb_len = 0;
1421                 ma_need &= ~(MA_LOV | MA_LMV);
1422                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
1423                        mdt_obd_name(info->mti_mdt),
1424                        req->rq_export->exp_client_uuid.uuid);
1425         }
1426
1427         /* from 2.12.58 intent_getattr pack default LMV in reply */
1428         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1429             ((reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA)) ==
1430                     (OBD_MD_MEA | OBD_MD_DEFAULT_MEA)) &&
1431             req_capsule_has_field(&req->rq_pill, &RMF_DEFAULT_MDT_MD,
1432                                   RCL_SERVER)) {
1433                 ma->ma_lmv = buffer->lb_buf;
1434                 ma->ma_lmv_size = buffer->lb_len;
1435                 ma->ma_default_lmv = req_capsule_server_get(pill,
1436                                                 &RMF_DEFAULT_MDT_MD);
1437                 ma->ma_default_lmv_size = req_capsule_get_size(pill,
1438                                                 &RMF_DEFAULT_MDT_MD,
1439                                                 RCL_SERVER);
1440                 ma->ma_need = MA_INODE;
1441                 if (ma->ma_lmv_size > 0)
1442                         ma->ma_need |= MA_LMV;
1443                 if (ma->ma_default_lmv_size > 0)
1444                         ma->ma_need |= MA_LMV_DEF;
1445         } else if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1446                    (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
1447                 /* If it is dir and client require MEA, then we got MEA */
1448                 /* Assumption: MDT_MD size is enough for lmv size. */
1449                 ma->ma_lmv = buffer->lb_buf;
1450                 ma->ma_lmv_size = buffer->lb_len;
1451                 ma->ma_need = MA_INODE;
1452                 if (ma->ma_lmv_size > 0) {
1453                         if (reqbody->mbo_valid & OBD_MD_MEA) {
1454                                 ma->ma_need |= MA_LMV;
1455                         } else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA) {
1456                                 ma->ma_need |= MA_LMV_DEF;
1457                                 ma->ma_default_lmv = buffer->lb_buf;
1458                                 ma->ma_lmv = NULL;
1459                                 ma->ma_default_lmv_size = buffer->lb_len;
1460                                 ma->ma_lmv_size = 0;
1461                         }
1462                 }
1463         } else {
1464                 ma->ma_lmm = buffer->lb_buf;
1465                 ma->ma_lmm_size = buffer->lb_len;
1466                 ma->ma_need = MA_INODE | MA_HSM;
1467                 if (ma->ma_lmm_size > 0) {
1468                         ma->ma_need |= MA_LOV;
1469                         /* Older clients may crash if they getattr overstriped
1470                          * files
1471                          */
1472                         if (!exp_connect_overstriping(exp) &&
1473                             mdt_lmm_is_overstriping(ma->ma_lmm))
1474                                 RETURN(-EOPNOTSUPP);
1475                 }
1476         }
1477
1478         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1479             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
1480             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
1481                 /* get default stripe info for this dir. */
1482                 ma->ma_need |= MA_LOV_DEF;
1483         }
1484         ma->ma_need |= ma_need;
1485
1486         rc = mdt_attr_get_complex(info, o, ma);
1487         if (unlikely(rc)) {
1488                 CDEBUG_LIMIT(rc == -ENOENT ? D_OTHER : D_ERROR,
1489                              "%s: getattr error for "DFID": rc = %d\n",
1490                              mdt_obd_name(info->mti_mdt),
1491                              PFID(mdt_object_fid(o)), rc);
1492                 RETURN(rc);
1493         }
1494
1495         /* return immutable attr on fscrypt metadata files
1496          * if fscrypt admin is not permitted
1497          */
1498         if (o->mot_obj.lo_header->loh_attr & LOHA_FSCRYPT_MD &&
1499             !mdt_ucred(info)->uc_rbac_fscrypt_admin)
1500                 la->la_flags |= LUSTRE_IMMUTABLE_FL;
1501
1502         /* if file is released, check if a restore is running */
1503         if (ma->ma_valid & MA_HSM) {
1504                 repbody->mbo_valid |= OBD_MD_TSTATE;
1505                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
1506                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
1507                         repbody->mbo_t_state = MS_RESTORE;
1508         }
1509
1510         if (unlikely(!(ma->ma_valid & MA_INODE)))
1511                 RETURN(-EFAULT);
1512
1513         mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1514
1515         if (mdt_body_has_lov(la, reqbody)) {
1516                 u32 stripe_count = 1;
1517                 bool fixed_layout = false;
1518
1519                 if (ma->ma_valid & MA_LOV) {
1520                         LASSERT(ma->ma_lmm_size);
1521                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1522                         if (S_ISDIR(la->la_mode))
1523                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1524                         else
1525                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1526                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1527                 }
1528                 if (ma->ma_valid & MA_LMV) {
1529                         struct lmv_mds_md_v1 *lmv = &ma->ma_lmv->lmv_md_v1;
1530                         u32 magic = le32_to_cpu(lmv->lmv_magic);
1531
1532                         /* Return -ENOTSUPP for old client */
1533                         if (!mdt_is_striped_client(req->rq_export))
1534                                 RETURN(-ENOTSUPP);
1535
1536                         LASSERT(S_ISDIR(la->la_mode));
1537                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1538                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1539                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1540
1541                         stripe_count = le32_to_cpu(lmv->lmv_stripe_count);
1542                         fixed_layout = lmv_is_fixed(lmv);
1543                         if (magic == LMV_MAGIC_STRIPE && lmv_is_restriping(lmv))
1544                                 mdt_restripe_migrate_add(info, o);
1545                         else if (magic == LMV_MAGIC_V1 &&
1546                                  lmv_is_restriping(lmv))
1547                                 mdt_restripe_update_add(info, o);
1548                 }
1549                 if (ma->ma_valid & MA_LMV_DEF) {
1550                         /* Return -ENOTSUPP for old client */
1551                         if (!mdt_is_striped_client(req->rq_export))
1552                                 RETURN(-ENOTSUPP);
1553                         LASSERT(S_ISDIR(la->la_mode));
1554                         /*
1555                          * when ll_dir_getstripe() gets default LMV, it
1556                          * checks mbo_eadatasize.
1557                          */
1558                         if (!(ma->ma_valid & MA_LMV))
1559                                 repbody->mbo_eadatasize =
1560                                         ma->ma_default_lmv_size;
1561                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1562                                                OBD_MD_DEFAULT_MEA);
1563                 }
1564                 CDEBUG(D_VFSTRACE,
1565                        "dirent count %llu stripe count %u MDT count %d\n",
1566                        ma->ma_attr.la_dirent_count, stripe_count,
1567                        atomic_read(&mdt->mdt_mds_mds_conns) + 1);
1568                 if (ma->ma_attr.la_dirent_count != LU_DIRENT_COUNT_UNSET &&
1569                     ma->ma_attr.la_dirent_count >
1570                         mdt->mdt_restriper.mdr_dir_split_count &&
1571                     !fid_is_root(mdt_object_fid(o)) &&
1572                     mdt->mdt_enable_dir_auto_split &&
1573                     !o->mot_restriping &&
1574                     stripe_count < atomic_read(&mdt->mdt_mds_mds_conns) + 1 &&
1575                     !fixed_layout)
1576                         mdt_auto_split_add(info, o);
1577         } else if (S_ISLNK(la->la_mode) &&
1578                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1579                 buffer->lb_buf = ma->ma_lmm;
1580                 /* eadatasize from client includes NULL-terminator, so
1581                  * there is no need to read it */
1582                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1583                 rc = mo_readlink(env, next, buffer);
1584                 if (unlikely(rc <= 0)) {
1585                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1586                                mdt_obd_name(info->mti_mdt),
1587                                PFID(mdt_object_fid(o)), rc);
1588                         rc = -EFAULT;
1589                 } else {
1590                         int print_limit = min_t(int, PAGE_SIZE - 128, rc);
1591
1592                         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1593                                 rc -= 2;
1594                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1595                         /* we need to report back size with NULL-terminator
1596                          * because client expects that */
1597                         repbody->mbo_eadatasize = rc + 1;
1598                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1599                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1600                                        "on "DFID ", expected %d\n",
1601                                        mdt_obd_name(info->mti_mdt),
1602                                        rc, PFID(mdt_object_fid(o)),
1603                                        reqbody->mbo_eadatasize - 1);
1604                         /* NULL terminate */
1605                         ((char *)ma->ma_lmm)[rc] = 0;
1606
1607                         /* If the total CDEBUG() size is larger than a page, it
1608                          * will print a warning to the console, avoid this by
1609                          * printing just the last part of the symlink. */
1610                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1611                                print_limit < rc ? "..." : "", print_limit,
1612                                (char *)ma->ma_lmm + rc - print_limit, rc);
1613                         rc = 0;
1614                 }
1615         }
1616
1617         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1618                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1619                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1620                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1621                        repbody->mbo_max_mdsize);
1622         }
1623
1624 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
1625         if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1626                  (reqbody->mbo_valid & OBD_MD_FLACL)) {
1627                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
1628                 if (IS_ERR(nodemap))
1629                         RETURN(PTR_ERR(nodemap));
1630
1631                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1632                 nodemap_putref(nodemap);
1633         }
1634 #endif
1635
1636 out:
1637         if (rc == 0)
1638                 mdt_counter_incr(req, LPROC_MDT_GETATTR,
1639                                  ktime_us_delta(ktime_get(), kstart));
1640
1641         RETURN(rc);
1642 }
1643
1644 static int mdt_getattr(struct tgt_session_info *tsi)
1645 {
1646         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1647         struct mdt_object       *obj = info->mti_object;
1648         struct req_capsule      *pill = info->mti_pill;
1649         struct mdt_body         *reqbody;
1650         struct mdt_body         *repbody;
1651         int rc, rc2;
1652         ENTRY;
1653
1654         if (unlikely(info->mti_object == NULL))
1655                 RETURN(-EPROTO);
1656
1657         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1658         LASSERT(reqbody);
1659         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1660
1661         /* Special case for Data-on-MDT files to get data version */
1662         if (unlikely(reqbody->mbo_valid & OBD_MD_FLDATAVERSION)) {
1663                 rc = mdt_data_version_get(tsi);
1664                 GOTO(out, rc);
1665         }
1666
1667         /* Unlike intent case where we need to pre-fill out buffers early on
1668          * in intent policy for ldlm reasons, here we can have a much better
1669          * guess at EA size by just reading it from disk.
1670          * Exceptions are readdir and (missing) directory striping */
1671         /* Readlink */
1672         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1673                 /* No easy way to know how long is the symlink, but it cannot
1674                  * be more than PATH_MAX, so we allocate +1 */
1675                 rc = PATH_MAX + 1;
1676         /* A special case for fs ROOT: getattr there might fetch
1677          * default EA for entire fs, not just for this dir!
1678          */
1679         } else if (lu_fid_eq(mdt_object_fid(obj),
1680                              &info->mti_mdt->mdt_md_root_fid) &&
1681                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1682                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1683                                                                  MDS_GETATTR)) {
1684                 /* Should the default strping be bigger, mdt_fix_reply
1685                  * will reallocate */
1686                 rc = DEF_REP_MD_SIZE;
1687         } else {
1688                 /* Read the actual EA size from disk */
1689                 rc = mdt_attr_get_eabuf_size(info, obj);
1690         }
1691
1692         if (rc < 0)
1693                 GOTO(out, rc = err_serious(rc));
1694
1695         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1696
1697         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
1698          * by default. If the target object has more ACL entries, then
1699          * enlarge the buffer when necessary. */
1700         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
1701                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
1702         mdt_preset_encctx_size(info);
1703
1704         rc = req_capsule_server_pack(pill);
1705         if (unlikely(rc != 0))
1706                 GOTO(out, rc = err_serious(rc));
1707
1708         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1709         LASSERT(repbody != NULL);
1710         repbody->mbo_eadatasize = 0;
1711         repbody->mbo_aclsize = 0;
1712
1713         rc = mdt_check_ucred(info);
1714         if (unlikely(rc))
1715                 GOTO(out_shrink, rc);
1716
1717         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1718
1719         rc = mdt_init_ucred(info, reqbody);
1720         if (rc)
1721                 GOTO(out_shrink, rc);
1722
1723         rc = mdt_getattr_internal(info, obj, 0);
1724         if (unlikely(rc))
1725                 GOTO(out_ucred, rc);
1726
1727         rc = mdt_pack_encctx_in_reply(info, obj);
1728         EXIT;
1729 out_ucred:
1730         mdt_exit_ucred(info);
1731 out_shrink:
1732         mdt_client_compatibility(info);
1733         rc2 = mdt_fix_reply(info);
1734         if (rc == 0)
1735                 rc = rc2;
1736 out:
1737         mdt_thread_info_fini(info);
1738         return rc;
1739 }
1740
1741 /**
1742  * Handler of layout intent RPC requiring the layout modification
1743  *
1744  * \param[in]  info     thread environment
1745  * \param[in]  obj      object
1746  * \param[out] lhc      object ldlm lock handle
1747  * \param[in]  layout   layout change descriptor
1748  *
1749  * \retval 0    on success
1750  * \retval < 0  error code
1751  */
1752 int mdt_layout_change(struct mdt_thread_info *info, struct mdt_object *obj,
1753                       struct mdt_lock_handle *lhc,
1754                       struct md_layout_change *layout)
1755 {
1756         int rc;
1757
1758         ENTRY;
1759
1760         if (!mdt_object_exists(obj))
1761                 RETURN(-ENOENT);
1762
1763         if (!S_ISREG(lu_object_attr(&obj->mot_obj)))
1764                 RETURN(-EINVAL);
1765
1766         rc = mo_permission(info->mti_env, NULL, mdt_object_child(obj), NULL,
1767                            MAY_WRITE);
1768         if (rc)
1769                 RETURN(rc);
1770
1771         rc = mdt_check_resent_lock(info, obj, lhc);
1772         if (rc < 0)
1773                 RETURN(rc);
1774
1775         if (rc > 0) {
1776                 /* not resent */
1777                 __u64 lockpart = MDS_INODELOCK_LAYOUT;
1778
1779                 /* take layout lock to prepare layout change */
1780                 if (layout->mlc_opc == MD_LAYOUT_WRITE)
1781                         lockpart |= MDS_INODELOCK_UPDATE;
1782
1783                 rc = mdt_object_lock(info, obj, lhc, lockpart, LCK_EX);
1784                 if (rc)
1785                         RETURN(rc);
1786         }
1787
1788         mutex_lock(&obj->mot_som_mutex);
1789         rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout);
1790         mutex_unlock(&obj->mot_som_mutex);
1791
1792         if (rc)
1793                 mdt_object_unlock(info, obj, lhc, 1);
1794
1795         RETURN(rc);
1796 }
1797
1798 /**
1799  * Exchange MOF_LOV_CREATED flags between two objects after a
1800  * layout swap. No assumption is made on whether o1 or o2 have
1801  * created objects or not.
1802  *
1803  * \param[in,out] o1    First swap layout object
1804  * \param[in,out] o2    Second swap layout object
1805  */
1806 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1807 {
1808         unsigned int o1_lov_created = o1->mot_lov_created;
1809
1810         mutex_lock(&o1->mot_lov_mutex);
1811         mutex_lock(&o2->mot_lov_mutex);
1812
1813         o1->mot_lov_created = o2->mot_lov_created;
1814         o2->mot_lov_created = o1_lov_created;
1815
1816         mutex_unlock(&o2->mot_lov_mutex);
1817         mutex_unlock(&o1->mot_lov_mutex);
1818 }
1819
1820 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1821 {
1822         struct mdt_thread_info  *info;
1823         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1824         struct obd_export       *exp = req->rq_export;
1825         struct mdt_object       *o1, *o2, *o;
1826         struct mdt_lock_handle  *lh1, *lh2;
1827         struct mdc_swap_layouts *msl;
1828         int                      rc;
1829         ENTRY;
1830
1831         /* client does not support layout lock, so layout swaping
1832          * is disabled.
1833          * FIXME: there is a problem for old clients which don't support
1834          * layout lock yet. If those clients have already opened the file
1835          * they won't be notified at all so that old layout may still be
1836          * used to do IO. This can be fixed after file release is landed by
1837          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1838         if (!exp_connect_layout(exp))
1839                 RETURN(-EOPNOTSUPP);
1840
1841         info = tsi2mdt_info(tsi);
1842         if (unlikely(info->mti_object == NULL))
1843                 RETURN(-EPROTO);
1844
1845         if (info->mti_dlm_req != NULL)
1846                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1847
1848         o1 = info->mti_object;
1849         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1850                                 &info->mti_body->mbo_fid2);
1851         if (IS_ERR(o))
1852                 GOTO(out, rc = PTR_ERR(o));
1853
1854         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1855                 GOTO(put, rc = -ENOENT);
1856
1857         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1858         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1859                 GOTO(put, rc);
1860
1861         if (rc < 0)
1862                 swap(o1, o2);
1863
1864         /* permission check. Make sure the calling process having permission
1865          * to write both files. */
1866         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1867                            MAY_WRITE);
1868         if (rc < 0)
1869                 GOTO(put, rc);
1870
1871         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1872                            MAY_WRITE);
1873         if (rc < 0)
1874                 GOTO(put, rc);
1875
1876         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1877         if (msl == NULL)
1878                 GOTO(put, rc = -EPROTO);
1879
1880         lh1 = &info->mti_lh[MDT_LH_NEW];
1881         lh2 = &info->mti_lh[MDT_LH_OLD];
1882         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1883                              MDS_INODELOCK_XATTR, LCK_EX);
1884         if (rc < 0)
1885                 GOTO(put, rc);
1886
1887         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1888                              MDS_INODELOCK_XATTR, LCK_EX);
1889         if (rc < 0)
1890                 GOTO(unlock1, rc);
1891
1892         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1893                              mdt_object_child(o2), msl->msl_flags);
1894         if (rc < 0)
1895                 GOTO(unlock2, rc);
1896
1897         mdt_swap_lov_flag(o1, o2);
1898
1899 unlock2:
1900         mdt_object_unlock(info, o2, lh2, rc);
1901 unlock1:
1902         mdt_object_unlock(info, o1, lh1, rc);
1903 put:
1904         mdt_object_put(info->mti_env, o);
1905 out:
1906         mdt_thread_info_fini(info);
1907         RETURN(rc);
1908 }
1909
1910 static int mdt_raw_lookup(struct mdt_thread_info *info,
1911                           struct mdt_object *parent,
1912                           const struct lu_name *lname)
1913 {
1914         struct lu_fid *fid = &info->mti_tmp_fid1;
1915         struct mdt_body *repbody;
1916         bool is_dotdot = false;
1917         bool is_old_parent_stripe = false;
1918         bool is_new_parent_checked = false;
1919         int rc;
1920
1921         ENTRY;
1922
1923         LASSERT(!info->mti_cross_ref);
1924         /* Always allow to lookup ".." */
1925         if (lname->ln_namelen == 2 &&
1926             lname->ln_name[0] == '.' && lname->ln_name[1] == '.') {
1927                 info->mti_spec.sp_permitted = 1;
1928                 is_dotdot = true;
1929                 if (mdt_is_dir_stripe(info, parent) == 1)
1930                         is_old_parent_stripe = true;
1931         }
1932
1933         mdt_object_get(info->mti_env, parent);
1934 lookup:
1935         /* Only got the fid of this obj by name */
1936         fid_zero(fid);
1937         rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname, fid,
1938                         &info->mti_spec);
1939         mdt_object_put(info->mti_env, parent);
1940         if (rc)
1941                 RETURN(rc);
1942
1943         /* getattr_name("..") should return master object FID for striped dir */
1944         if (is_dotdot && (is_old_parent_stripe || !is_new_parent_checked)) {
1945                 parent = mdt_object_find(info->mti_env, info->mti_mdt, fid);
1946                 if (IS_ERR(parent))
1947                         RETURN(PTR_ERR(parent));
1948
1949                 /* old client getattr_name("..") with stripe FID */
1950                 if (unlikely(is_old_parent_stripe)) {
1951                         is_old_parent_stripe = false;
1952                         goto lookup;
1953                 }
1954
1955                 /* ".." may be a stripe */
1956                 if (unlikely(mdt_is_dir_stripe(info, parent) == 1)) {
1957                         is_new_parent_checked = true;
1958                         goto lookup;
1959                 }
1960
1961                 mdt_object_put(info->mti_env, parent);
1962         }
1963
1964         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1965         repbody->mbo_fid1 = *fid;
1966         repbody->mbo_valid = OBD_MD_FLID;
1967
1968         RETURN(rc);
1969 }
1970
1971 /**
1972  * Find name matching hash
1973  *
1974  * We search \a child LinkEA for a name whose hash matches \a lname
1975  * (it contains an encoded hash).
1976  *
1977  * \param info mdt thread info
1978  * \param lname encoded hash to find
1979  * \param parent parent object
1980  * \param child object to search with LinkEA
1981  *
1982  * \retval 1 match found
1983  * \retval 0 no match found
1984  * \retval -ev negative errno upon error
1985  */
1986 int find_name_matching_hash(struct mdt_thread_info *info, struct lu_name *lname,
1987                             struct mdt_object *parent, struct mdt_object *child)
1988 {
1989         /* Here, lname is an encoded hash of on-disk name, and
1990          * client is doing access without encryption key.
1991          * So we need to get LinkEA, check parent fid is correct and
1992          * compare name hash with the one in the request.
1993          */
1994         struct lu_buf *buf = &info->mti_big_buf;
1995         struct lu_name name;
1996         struct lu_fid pfid;
1997         struct linkea_data ldata = { NULL };
1998         struct link_ea_header *leh;
1999         struct link_ea_entry *lee;
2000         struct lu_buf link = { 0 };
2001         char *hash;
2002         int reclen, count, rc;
2003
2004         ENTRY;
2005         if (lname->ln_namelen < LL_CRYPTO_BLOCK_SIZE)
2006                 RETURN(-EINVAL);
2007
2008         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
2009         if (!buf->lb_buf)
2010                 RETURN(-ENOMEM);
2011
2012         ldata.ld_buf = buf;
2013         rc = mdt_links_read(info, child, &ldata);
2014         if (rc < 0)
2015                 RETURN(rc);
2016
2017         hash = kmalloc(lname->ln_namelen, GFP_NOFS);
2018         if (!hash)
2019                 RETURN(-ENOMEM);
2020         rc = critical_decode(lname->ln_name, lname->ln_namelen, hash);
2021
2022         leh = buf->lb_buf;
2023         lee = (struct link_ea_entry *)(leh + 1);
2024         for (count = 0; count < leh->leh_reccount; count++) {
2025                 linkea_entry_unpack(lee, &reclen, &name, &pfid);
2026                 if (!parent || lu_fid_eq(&pfid, mdt_object_fid(parent))) {
2027                         lu_buf_check_and_alloc(&link, name.ln_namelen);
2028                         if (!link.lb_buf)
2029                                 GOTO(out_match, rc = -ENOMEM);
2030                         rc = critical_decode(name.ln_name, name.ln_namelen,
2031                                              link.lb_buf);
2032
2033                         if (memcmp(LLCRYPT_EXTRACT_DIGEST(link.lb_buf, rc),
2034                                    hash, LL_CRYPTO_BLOCK_SIZE) == 0) {
2035                                 *lname = name;
2036                                 break;
2037                         }
2038                 }
2039                 lee = (struct link_ea_entry *) ((char *)lee + reclen);
2040         }
2041         if (count == leh->leh_reccount)
2042                 rc = 0;
2043         else
2044                 rc = 1;
2045
2046 out_match:
2047         lu_buf_free(&link);
2048         kfree(hash);
2049
2050         RETURN(rc);
2051 }
2052
2053 /*
2054  * UPDATE lock should be taken against parent, and be released before exit;
2055  * child_bits lock should be taken against child, and be returned back:
2056  *            (1)normal request should release the child lock;
2057  *            (2)intent request will grant the lock to client.
2058  */
2059 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
2060                                  struct mdt_lock_handle *lhc,
2061                                  __u64 child_bits,
2062                                  struct ldlm_reply *ldlm_rep)
2063 {
2064         struct ptlrpc_request *req = mdt_info_req(info);
2065         struct mdt_body *reqbody = NULL;
2066         struct mdt_object *parent = info->mti_object;
2067         struct mdt_object *child = NULL;
2068         struct lu_fid *child_fid = &info->mti_tmp_fid1;
2069         struct lu_name *lname = NULL;
2070         struct mdt_lock_handle *lhp = NULL;
2071         struct ldlm_lock *lock;
2072         struct req_capsule *pill = info->mti_pill;
2073         bool fscrypt_md = false;
2074         __u64 try_bits = 0;
2075         bool is_resent;
2076         int ma_need = 0;
2077         int rc;
2078
2079         ENTRY;
2080
2081         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
2082         LASSERT(ergo(is_resent,
2083                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
2084
2085         if (parent == NULL)
2086                 RETURN(-ENOENT);
2087
2088         if (info->mti_mdt->mdt_enable_dir_auto_split)
2089                 ma_need |= MA_DIRENT_CNT;
2090
2091         if (info->mti_cross_ref) {
2092                 /* Only getattr on the child. Parent is on another node. */
2093                 mdt_set_disposition(info, ldlm_rep,
2094                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
2095                 child = parent;
2096                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
2097                        "ldlm_rep = %p\n",
2098                        PFID(mdt_object_fid(child)), ldlm_rep);
2099
2100                 rc = mdt_check_resent_lock(info, child, lhc);
2101                 if (rc < 0) {
2102                         RETURN(rc);
2103                 } else if (rc > 0) {
2104                         /*
2105                          * Object's name entry is on another MDS, it will
2106                          * request PERM lock only because LOOKUP lock is owned
2107                          * by the MDS where name entry resides.
2108                          *
2109                          * TODO: it should try layout lock too. - Jinshan
2110                          */
2111                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
2112                                         MDS_INODELOCK_LAYOUT);
2113                         child_bits |= MDS_INODELOCK_PERM;
2114                         rc = mdt_object_lock(info, child, lhc, child_bits,
2115                                              LCK_PR);
2116                         if (rc < 0)
2117                                 RETURN(rc);
2118                 }
2119
2120                 /* Finally, we can get attr for child. */
2121                 if (!mdt_object_exists(child)) {
2122                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
2123                                         &child->mot_obj,
2124                                         "remote object doesn't exist.");
2125                         mdt_object_unlock(info, child, lhc, 1);
2126                         RETURN(-ENOENT);
2127                 }
2128
2129                 rc = mdt_getattr_internal(info, child, ma_need);
2130                 if (unlikely(rc != 0)) {
2131                         mdt_object_unlock(info, child, lhc, 1);
2132                         RETURN(rc);
2133                 }
2134
2135                 rc = mdt_pack_secctx_in_reply(info, child);
2136                 if (unlikely(rc)) {
2137                         mdt_object_unlock(info, child, lhc, 1);
2138                         RETURN(rc);
2139                 }
2140
2141                 rc = mdt_pack_encctx_in_reply(info, child);
2142                 if (unlikely(rc))
2143                         mdt_object_unlock(info, child, lhc, 1);
2144                 RETURN(rc);
2145         }
2146
2147         lname = &info->mti_name;
2148         mdt_name_unpack(pill, &RMF_NAME, lname, MNF_FIX_ANON);
2149
2150         if (info->mti_body->mbo_valid & OBD_MD_NAMEHASH) {
2151                 reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
2152                 if (unlikely(reqbody == NULL))
2153                         RETURN(err_serious(-EPROTO));
2154
2155                 *child_fid = reqbody->mbo_fid2;
2156                 if (unlikely(!fid_is_sane(child_fid)))
2157                         RETURN(err_serious(-EINVAL));
2158
2159                 if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
2160                         mdt_object_get(info->mti_env, parent);
2161                         child = parent;
2162                 } else {
2163                         child = mdt_object_find(info->mti_env, info->mti_mdt,
2164                                                 child_fid);
2165                         if (IS_ERR(child))
2166                                 RETURN(PTR_ERR(child));
2167                 }
2168
2169                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
2170                        "ldlm_rep = %p\n",
2171                        PFID(mdt_object_fid(parent)),
2172                        PFID(&reqbody->mbo_fid2), ldlm_rep);
2173         } else if (lu_name_is_valid(lname)) {
2174                 if (mdt_object_remote(parent)) {
2175                         CERROR("%s: parent "DFID" is on remote target\n",
2176                                mdt_obd_name(info->mti_mdt),
2177                                PFID(mdt_object_fid(parent)));
2178                         RETURN(-EPROTO);
2179                 }
2180
2181                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
2182                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
2183                        PNAME(lname), ldlm_rep);
2184
2185                 if (parent->mot_obj.lo_header->loh_attr & LOHA_FSCRYPT_MD ||
2186                     (fid_is_root(mdt_object_fid(parent)) &&
2187                      lname->ln_namelen == strlen(dot_fscrypt_name) &&
2188                      strncmp(lname->ln_name, dot_fscrypt_name,
2189                              lname->ln_namelen) == 0))
2190                         fscrypt_md = true;
2191         } else {
2192                 reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
2193                 if (unlikely(reqbody == NULL))
2194                         RETURN(err_serious(-EPROTO));
2195
2196                 *child_fid = reqbody->mbo_fid2;
2197                 if (unlikely(!fid_is_sane(child_fid)))
2198                         RETURN(err_serious(-EINVAL));
2199
2200                 if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
2201                         mdt_object_get(info->mti_env, parent);
2202                         child = parent;
2203                 } else {
2204                         child = mdt_object_find(info->mti_env, info->mti_mdt,
2205                                                 child_fid);
2206                         if (IS_ERR(child))
2207                                 RETURN(PTR_ERR(child));
2208                 }
2209
2210                 if (mdt_object_remote(child)) {
2211                         CERROR("%s: child "DFID" is on remote target\n",
2212                                mdt_obd_name(info->mti_mdt),
2213                                PFID(mdt_object_fid(child)));
2214                         GOTO(out_child, rc = -EPROTO);
2215                 }
2216
2217                 /* don't fetch LOOKUP lock if it's remote object */
2218                 rc = mdt_is_remote_object(info, parent, child);
2219                 if (rc < 0)
2220                         GOTO(out_child, rc);
2221                 if (rc)
2222                         child_bits &= ~MDS_INODELOCK_LOOKUP;
2223
2224                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
2225                        "ldlm_rep = %p\n",
2226                        PFID(mdt_object_fid(parent)),
2227                        PFID(&reqbody->mbo_fid2), ldlm_rep);
2228         }
2229
2230         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
2231
2232         if (unlikely(!mdt_object_exists(parent)) &&
2233             !(info->mti_body->mbo_valid & OBD_MD_NAMEHASH) &&
2234             lu_name_is_valid(lname)) {
2235                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
2236                                 &parent->mot_obj,
2237                                 "Parent doesn't exist!");
2238                 GOTO(out_child, rc = -ESTALE);
2239         }
2240
2241         if (!child && is_resent) {
2242                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2243                 if (lock == NULL) {
2244                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2245                          * a resend case, however, it could be already destroyed
2246                          * due to client eviction or a raced cancel RPC.
2247                          */
2248                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
2249                                           lhc->mlh_reg_lh.cookie);
2250                         RETURN(-ESTALE);
2251                 }
2252                 fid_extract_from_res_name(child_fid,
2253                                           &lock->l_resource->lr_name);
2254                 LDLM_LOCK_PUT(lock);
2255                 child = mdt_object_find(info->mti_env, info->mti_mdt,
2256                                         child_fid);
2257                 if (IS_ERR(child))
2258                         RETURN(PTR_ERR(child));
2259         } else if (!(info->mti_body->mbo_valid & OBD_MD_NAMEHASH) &&
2260             lu_name_is_valid(lname)) {
2261                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
2262                         rc = mdt_raw_lookup(info, parent, lname);
2263
2264                         RETURN(rc);
2265                 }
2266
2267                 /* step 1: lock parent only if parent is a directory */
2268                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
2269                         lhp = &info->mti_lh[MDT_LH_PARENT];
2270                         rc = mdt_parent_lock(info, parent, lhp, lname, LCK_PR);
2271                         if (unlikely(rc != 0))
2272                                 RETURN(rc);
2273                 }
2274
2275                 /* step 2: lookup child's fid by name */
2276                 fid_zero(child_fid);
2277                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
2278                                 child_fid, &info->mti_spec);
2279                 if (rc == -ENOENT)
2280                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
2281
2282                 if (rc != 0)
2283                         GOTO(unlock_parent, rc);
2284
2285                 child = mdt_object_find(info->mti_env, info->mti_mdt,
2286                                         child_fid);
2287                 if (unlikely(IS_ERR(child)))
2288                         GOTO(unlock_parent, rc = PTR_ERR(child));
2289         }
2290
2291         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
2292
2293         /* step 3: lock child regardless if it is local or remote. */
2294         LASSERT(child);
2295
2296         if (info->mti_body->mbo_valid & OBD_MD_NAMEHASH) {
2297                 /* Here, lname is an encoded hash of on-disk name, and
2298                  * client is doing access without encryption key.
2299                  * So we need to compare name hash with the one in the request.
2300                  */
2301                 if (!find_name_matching_hash(info, lname, parent,
2302                                              child)) {
2303                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
2304                         mdt_clear_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
2305                         GOTO(out_child, rc = -ENOENT);
2306                 }
2307         }
2308
2309         CFS_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
2310         if (!mdt_object_exists(child)) {
2311                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
2312                                 &child->mot_obj,
2313                                 "Object doesn't exist!");
2314                 GOTO(out_child, rc = -ENOENT);
2315         }
2316
2317         rc = mdt_check_resent_lock(info, child, lhc);
2318         if (rc < 0) {
2319                 GOTO(out_child, rc);
2320         } else if (rc > 0) {
2321                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
2322                     !mdt_object_remote(child)) {
2323                         struct md_attr *ma = &info->mti_attr;
2324
2325                         ma->ma_valid = 0;
2326                         ma->ma_need = MA_INODE;
2327                         rc = mdt_attr_get_complex(info, child, ma);
2328                         if (unlikely(rc != 0))
2329                                 GOTO(out_child, rc);
2330
2331                         /* If the file has not been changed for some time, we
2332                          * return not only a LOOKUP lock, but also an UPDATE
2333                          * lock and this might save us RPC on later STAT. For
2334                          * directories, it also let negative dentry cache start
2335                          * working for this dir. */
2336                         if (ma->ma_valid & MA_INODE &&
2337                             ma->ma_attr.la_valid & LA_CTIME &&
2338                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
2339                             ma->ma_attr.la_ctime < ktime_get_real_seconds())
2340                                 child_bits |= MDS_INODELOCK_UPDATE;
2341                 }
2342
2343                 /* layout lock must be granted in a best-effort way
2344                  * for IT operations */
2345                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
2346                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
2347                     !mdt_object_remote(child) && ldlm_rep != NULL) {
2348                         if (!CFS_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
2349                             exp_connect_layout(info->mti_exp)) {
2350                                 /* try to grant layout lock for regular file. */
2351                                 try_bits = MDS_INODELOCK_LAYOUT;
2352                         }
2353                         /* Acquire DOM lock in advance for data-on-mdt file */
2354                         if (child != parent)
2355                                 try_bits |= MDS_INODELOCK_DOM;
2356                 }
2357
2358                 /*
2359                  * To avoid possible deadlock between batched statahead RPC
2360                  * and rename()/migrate() operation, it should use trylock to
2361                  * obtain the DLM PR ibits lock for file attributes in a
2362                  * batched statahead RPC. A failed trylock means that other
2363                  * users maybe modify the directory simultaneously as in current
2364                  * Lustre design the server only grants read lock to a client.
2365                  *
2366                  * When a trylock failed, the MDT reports the conflict with
2367                  * error code -EBUSY, and stops statahead immediately.
2368                  */
2369                 if (info->mti_batch_env) {
2370                         /*
2371                          * This is a sub stat-ahead request in a batched RPC.
2372                          * However, the @child is a remote object, we just
2373                          * return -EREMOTE here to forbid stat-ahead on it.
2374                          */
2375                         if (mdt_object_remote(child))
2376                                 GOTO(out_child, rc = -EREMOTE);
2377
2378                         try_bits |= child_bits;
2379                         child_bits = 0;
2380                 }
2381
2382                 if (try_bits != 0) {
2383                         /* try layout lock, it may fail to be granted due to
2384                          * contention at LOOKUP or UPDATE */
2385                         rc = mdt_object_lock_try(info, child, lhc, &child_bits,
2386                                                  try_bits, LCK_PR);
2387                         if (child_bits & MDS_INODELOCK_LAYOUT)
2388                                 ma_need |= MA_LOV;
2389                 } else {
2390                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
2391                          * client will enqueue the lock to the remote MDT */
2392                         if (mdt_object_remote(child))
2393                                 rc = mdt_object_lookup_lock(info, NULL, child,
2394                                                             lhc, LCK_PR);
2395                         else
2396                                 rc = mdt_object_lock(info, child, lhc,
2397                                                      child_bits, LCK_PR);
2398                 }
2399                 if (unlikely(rc != 0))
2400                         GOTO(out_child, rc);
2401                 if (info->mti_batch_env && child_bits == 0) {
2402                         if (!is_resent)
2403                                 mdt_object_unlock(info, child, lhc, 1);
2404                         GOTO(out_child, rc = -EBUSY);
2405                 }
2406         }
2407
2408         if (fscrypt_md)
2409                 child->mot_obj.lo_header->loh_attr |= LOHA_FSCRYPT_MD;
2410
2411         /* finally, we can get attr for child. */
2412         rc = mdt_getattr_internal(info, child, ma_need);
2413         if (unlikely(rc != 0)) {
2414                 if (!is_resent)
2415                         mdt_object_unlock(info, child, lhc, 1);
2416                 GOTO(out_child, rc);
2417         }
2418
2419         rc = mdt_pack_secctx_in_reply(info, child);
2420         if (unlikely(rc)) {
2421                 if (!is_resent)
2422                         mdt_object_unlock(info, child, lhc, 1);
2423                 GOTO(out_child, rc);
2424         }
2425
2426         rc = mdt_pack_encctx_in_reply(info, child);
2427         if (unlikely(rc)) {
2428                 if (!is_resent)
2429                         mdt_object_unlock(info, child, lhc, 1);
2430                 GOTO(out_child, rc);
2431         }
2432
2433         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2434         if (lock) {
2435                 /* Debugging code. */
2436                 LDLM_DEBUG(lock, "Returning lock to client");
2437                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
2438                                          &lock->l_resource->lr_name),
2439                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
2440                          PLDLMRES(lock->l_resource),
2441                          PFID(mdt_object_fid(child)));
2442
2443                 if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_ENQ_RESEND))) {
2444                         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
2445                                 CFS_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_ENQ_RESEND,
2446                                                  req->rq_deadline -
2447                                                  req->rq_arrival_time.tv_sec +
2448                                                  cfs_fail_val ?: 3);
2449                         /* Put the lock to the waiting list and force the cancel */
2450                         ldlm_set_ast_sent(lock);
2451                 }
2452
2453                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
2454                     !mdt_object_remote(child) && child != parent) {
2455                         mdt_object_put(info->mti_env, child);
2456                         rc = mdt_pack_size2body(info, child_fid,
2457                                                 &lhc->mlh_reg_lh);
2458                         if (rc != 0 && child_bits & MDS_INODELOCK_DOM) {
2459                                 /* DOM lock was taken in advance but this is
2460                                  * not DoM file. Drop the lock.
2461                                  */
2462                                 lock_res_and_lock(lock);
2463                                 ldlm_inodebits_drop(lock, MDS_INODELOCK_DOM);
2464                                 unlock_res_and_lock(lock);
2465                         }
2466                         LDLM_LOCK_PUT(lock);
2467                         GOTO(unlock_parent, rc = 0);
2468                 }
2469                 LDLM_LOCK_PUT(lock);
2470         }
2471
2472         EXIT;
2473 out_child:
2474         if (child)
2475                 mdt_object_put(info->mti_env, child);
2476 unlock_parent:
2477         if (lhp)
2478                 mdt_object_unlock(info, parent, lhp, 1);
2479         if (rc == -ENOENT) {
2480                 /* return -ENOKEY instead of -ENOENT to encryption-unaware
2481                  * client if trying to access an encrypted file
2482                  */
2483                 int rc2 = mdt_check_enc(info, parent);
2484
2485                 if (rc2)
2486                         rc = rc2;
2487         }
2488         return rc;
2489 }
2490
2491 /* normal handler: should release the child lock */
2492 static int mdt_getattr_name(struct tgt_session_info *tsi)
2493 {
2494         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
2495         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
2496         struct mdt_body *reqbody;
2497         struct mdt_body *repbody;
2498         int rc, rc2;
2499
2500         ENTRY;
2501
2502         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
2503         LASSERT(reqbody != NULL);
2504         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
2505         LASSERT(repbody != NULL);
2506
2507         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
2508         repbody->mbo_eadatasize = 0;
2509         repbody->mbo_aclsize = 0;
2510
2511         rc = mdt_init_ucred(info, reqbody);
2512         if (unlikely(rc))
2513                 GOTO(out_shrink, rc);
2514
2515         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
2516         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
2517                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
2518                 lhc->mlh_reg_lh.cookie = 0;
2519         }
2520         mdt_exit_ucred(info);
2521         EXIT;
2522 out_shrink:
2523         mdt_client_compatibility(info);
2524         rc2 = mdt_fix_reply(info);
2525         if (rc == 0)
2526                 rc = rc2;
2527         mdt_thread_info_fini(info);
2528         return rc;
2529 }
2530
2531 static int mdt_rmfid_unlink(struct mdt_thread_info *info,
2532                             const struct lu_fid *pfid,
2533                             const struct lu_name *name,
2534                             struct mdt_object *obj, s64 ctime)
2535 {
2536         struct lu_fid *child_fid = &info->mti_tmp_fid1;
2537         struct ldlm_enqueue_info *einfo = &info->mti_einfo;
2538         struct mdt_device *mdt = info->mti_mdt;
2539         struct md_attr *ma = &info->mti_attr;
2540         struct mdt_lock_handle *parent_lh;
2541         struct mdt_lock_handle *child_lh;
2542         struct mdt_object *pobj;
2543         int rc;
2544         ENTRY;
2545
2546         pobj = mdt_object_find(info->mti_env, mdt, pfid);
2547         if (IS_ERR(pobj))
2548                 GOTO(out, rc = PTR_ERR(pobj));
2549
2550         parent_lh = &info->mti_lh[MDT_LH_PARENT];
2551         rc = mdt_parent_lock(info, pobj, parent_lh, name, LCK_PW);
2552         if (rc != 0)
2553                 GOTO(put_parent, rc);
2554
2555         rc = mdo_lookup(info->mti_env, mdt_object_child(pobj),
2556                         name, child_fid, &info->mti_spec);
2557         if (rc != 0)
2558                 GOTO(unlock_parent, rc);
2559
2560         if (!lu_fid_eq(child_fid, mdt_object_fid(obj)))
2561                 GOTO(unlock_parent, rc = -EREMCHG);
2562
2563         child_lh = &info->mti_lh[MDT_LH_CHILD];
2564         rc = mdt_object_stripes_lock(info, pobj, obj, child_lh, einfo,
2565                                      MDS_INODELOCK_LOOKUP |
2566                                      MDS_INODELOCK_UPDATE, LCK_EX);
2567         if (rc != 0)
2568                 GOTO(unlock_parent, rc);
2569
2570         if (atomic_read(&obj->mot_open_count)) {
2571                 CDEBUG(D_OTHER, "object "DFID" open, skip\n",
2572                        PFID(mdt_object_fid(obj)));
2573                 GOTO(unlock_child, rc = -EBUSY);
2574         }
2575
2576         ma->ma_need = 0;
2577         ma->ma_valid = MA_INODE;
2578         ma->ma_attr.la_valid = LA_CTIME;
2579         ma->ma_attr.la_ctime = ctime;
2580
2581         mutex_lock(&obj->mot_lov_mutex);
2582
2583         rc = mdo_unlink(info->mti_env, mdt_object_child(pobj),
2584                         mdt_object_child(obj), name, ma, 0);
2585
2586         mutex_unlock(&obj->mot_lov_mutex);
2587
2588 unlock_child:
2589         mdt_object_stripes_unlock(info, obj, child_lh, einfo, 1);
2590 unlock_parent:
2591         mdt_object_unlock(info, pobj, parent_lh, 1);
2592 put_parent:
2593         mdt_object_put(info->mti_env, pobj);
2594 out:
2595         RETURN(rc);
2596 }
2597
2598 static int mdt_rmfid_check_permission(struct mdt_thread_info *info,
2599                                         struct mdt_object *obj)
2600 {
2601         struct lu_ucred *uc = lu_ucred(info->mti_env);
2602         struct md_attr *ma = &info->mti_attr;
2603         struct lu_attr *la = &ma->ma_attr;
2604         int rc = 0;
2605         ENTRY;
2606
2607         ma->ma_need = MA_INODE;
2608         rc = mo_attr_get(info->mti_env, mdt_object_child(obj), ma);
2609         if (rc)
2610                 GOTO(out, rc);
2611
2612         if (la->la_flags & LUSTRE_IMMUTABLE_FL)
2613                         rc = -EACCES;
2614
2615         /* we want rbac roles to have precedence over any other
2616          * permission or capability checks
2617          */
2618         if (!uc->uc_rbac_byfid_ops)
2619                 RETURN(-EPERM);
2620         if (cap_raised(uc->uc_cap, CAP_DAC_OVERRIDE))
2621                 RETURN(0);
2622         if (uc->uc_fsuid == la->la_uid) {
2623                 if ((la->la_mode & S_IWUSR) == 0)
2624                         rc = -EACCES;
2625         } else if (uc->uc_fsgid == la->la_gid) {
2626                 if ((la->la_mode & S_IWGRP) == 0)
2627                         rc = -EACCES;
2628         } else if ((la->la_mode & S_IWOTH) == 0) {
2629                         rc = -EACCES;
2630         }
2631
2632 out:
2633         RETURN(rc);
2634 }
2635
2636 static int mdt_rmfid_one(struct mdt_thread_info *info, struct lu_fid *fid,
2637                          s64 ctime)
2638 {
2639         struct mdt_device *mdt = info->mti_mdt;
2640         struct mdt_object *obj = NULL;
2641         struct linkea_data ldata = { NULL };
2642         struct lu_buf *buf = &info->mti_big_buf;
2643         struct lu_name *name = &info->mti_name;
2644         struct lu_fid *pfid = &info->mti_tmp_fid1;
2645         struct link_ea_header *leh;
2646         struct link_ea_entry *lee;
2647         int reclen, count, rc = 0;
2648         ENTRY;
2649
2650         if (!fid_is_sane(fid))
2651                 GOTO(out, rc = -EINVAL);
2652
2653         if (!fid_is_namespace_visible(fid))
2654                 GOTO(out, rc = -EINVAL);
2655
2656         obj = mdt_object_find(info->mti_env, mdt, fid);
2657         if (IS_ERR(obj))
2658                 GOTO(out, rc = PTR_ERR(obj));
2659
2660         if (mdt_object_remote(obj))
2661                 GOTO(out, rc = -EREMOTE);
2662         if (!mdt_object_exists(obj) || lu_object_is_dying(&obj->mot_header))
2663                 GOTO(out, rc = -ENOENT);
2664
2665         rc = mdt_rmfid_check_permission(info, obj);
2666         if (rc)
2667                 GOTO(out, rc);
2668
2669         /* take LinkEA */
2670         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
2671         if (!buf->lb_buf)
2672                 GOTO(out, rc = -ENOMEM);
2673
2674         ldata.ld_buf = buf;
2675         rc = mdt_links_read(info, obj, &ldata);
2676         if (rc)
2677                 GOTO(out, rc);
2678
2679         leh = buf->lb_buf;
2680         lee = (struct link_ea_entry *)(leh + 1);
2681         for (count = 0; count < leh->leh_reccount; count++) {
2682                 /* remove every hardlink */
2683                 linkea_entry_unpack(lee, &reclen, name, pfid);
2684                 lee = (struct link_ea_entry *) ((char *)lee + reclen);
2685                 rc = mdt_rmfid_unlink(info, pfid, name, obj, ctime);
2686                 if (rc)
2687                         break;
2688         }
2689
2690 out:
2691         if (obj && !IS_ERR(obj))
2692                 mdt_object_put(info->mti_env, obj);
2693         if (info->mti_big_buf.lb_buf)
2694                 lu_buf_free(&info->mti_big_buf);
2695
2696         RETURN(rc);
2697 }
2698
2699 static int mdt_rmfid(struct tgt_session_info *tsi)
2700 {
2701         struct mdt_thread_info *mti = tsi2mdt_info(tsi);
2702         struct mdt_body *reqbody;
2703         struct lu_fid *fids, *rfids;
2704         int bufsize, rc;
2705         __u32 *rcs;
2706         int i, nr;
2707         ENTRY;
2708
2709         reqbody = req_capsule_client_get(tsi->tsi_pill, &RMF_MDT_BODY);
2710         if (reqbody == NULL)
2711                 RETURN(-EPROTO);
2712         bufsize = req_capsule_get_size(tsi->tsi_pill, &RMF_FID_ARRAY,
2713                                        RCL_CLIENT);
2714         nr = bufsize / sizeof(struct lu_fid);
2715         if (nr * sizeof(struct lu_fid) != bufsize)
2716                 RETURN(-EINVAL);
2717         req_capsule_set_size(tsi->tsi_pill, &RMF_RCS,
2718                              RCL_SERVER, nr * sizeof(__u32));
2719         req_capsule_set_size(tsi->tsi_pill, &RMF_FID_ARRAY,
2720                              RCL_SERVER, nr * sizeof(struct lu_fid));
2721         rc = req_capsule_server_pack(tsi->tsi_pill);
2722         if (rc)
2723                 GOTO(out, rc = err_serious(rc));
2724         fids = req_capsule_client_get(tsi->tsi_pill, &RMF_FID_ARRAY);
2725         if (fids == NULL)
2726                 RETURN(-EPROTO);
2727         rcs = req_capsule_server_get(tsi->tsi_pill, &RMF_RCS);
2728         LASSERT(rcs);
2729         rfids = req_capsule_server_get(tsi->tsi_pill, &RMF_FID_ARRAY);
2730         LASSERT(rfids);
2731
2732         mdt_init_ucred(mti, reqbody);
2733         for (i = 0; i < nr; i++) {
2734                 rfids[i] = fids[i];
2735                 rcs[i] = mdt_rmfid_one(mti, fids + i, reqbody->mbo_ctime);
2736         }
2737         mdt_exit_ucred(mti);
2738
2739 out:
2740         RETURN(rc);
2741 }
2742
2743 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2744                          void *karg, void __user *uarg);
2745
2746 int mdt_io_set_info(struct tgt_session_info *tsi)
2747 {
2748         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2749         struct ost_body         *body = NULL, *repbody;
2750         void                    *key, *val = NULL;
2751         int                      keylen, vallen, rc = 0;
2752         bool                     is_grant_shrink;
2753
2754         ENTRY;
2755
2756         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
2757         if (key == NULL) {
2758                 DEBUG_REQ(D_HA, req, "no set_info key");
2759                 RETURN(err_serious(-EFAULT));
2760         }
2761         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
2762                                       RCL_CLIENT);
2763
2764         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
2765         if (val == NULL) {
2766                 DEBUG_REQ(D_HA, req, "no set_info val");
2767                 RETURN(err_serious(-EFAULT));
2768         }
2769         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
2770                                       RCL_CLIENT);
2771
2772         is_grant_shrink = KEY_IS(KEY_GRANT_SHRINK);
2773         if (is_grant_shrink)
2774                 /* In this case the value is actually an RMF_OST_BODY, so we
2775                  * transmutate the type of this PTLRPC */
2776                 req_capsule_extend(tsi->tsi_pill, &RQF_OST_SET_GRANT_INFO);
2777
2778         rc = req_capsule_server_pack(tsi->tsi_pill);
2779         if (rc < 0)
2780                 RETURN(rc);
2781
2782         if (is_grant_shrink) {
2783                 body = req_capsule_client_get(tsi->tsi_pill, &RMF_OST_BODY);
2784
2785                 repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
2786                 *repbody = *body;
2787
2788                 /** handle grant shrink, similar to a read request */
2789                 tgt_grant_prepare_read(tsi->tsi_env, tsi->tsi_exp,
2790                                        &repbody->oa);
2791         } else {
2792                 CERROR("%s: Unsupported key %s\n",
2793                        tgt_name(tsi->tsi_tgt), (char *)key);
2794                 rc = -EOPNOTSUPP;
2795         }
2796
2797         RETURN(rc);
2798 }
2799
2800
2801 static int mdt_set_info(struct tgt_session_info *tsi)
2802 {
2803         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2804         char                    *key;
2805         void                    *val;
2806         int                      keylen, vallen, rc = 0;
2807
2808         ENTRY;
2809
2810         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
2811         if (key == NULL) {
2812                 DEBUG_REQ(D_HA, req, "no set_info key");
2813                 RETURN(err_serious(-EFAULT));
2814         }
2815
2816         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
2817                                       RCL_CLIENT);
2818
2819         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
2820         if (val == NULL) {
2821                 DEBUG_REQ(D_HA, req, "no set_info val");
2822                 RETURN(err_serious(-EFAULT));
2823         }
2824
2825         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
2826                                       RCL_CLIENT);
2827
2828         /* Swab any part of val you need to here */
2829         if (KEY_IS(KEY_READ_ONLY)) {
2830                 spin_lock(&req->rq_export->exp_lock);
2831                 if (*(__u32 *)val)
2832                         *exp_connect_flags_ptr(req->rq_export) |=
2833                                 OBD_CONNECT_RDONLY;
2834                 else
2835                         *exp_connect_flags_ptr(req->rq_export) &=
2836                                 ~OBD_CONNECT_RDONLY;
2837                 spin_unlock(&req->rq_export->exp_lock);
2838         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2839                 struct changelog_setinfo *cs = val;
2840
2841                 if (vallen != sizeof(*cs)) {
2842                         CERROR("%s: bad changelog_clear setinfo size %d\n",
2843                                tgt_name(tsi->tsi_tgt), vallen);
2844                         RETURN(-EINVAL);
2845                 }
2846                 if (req_capsule_req_need_swab(&req->rq_pill)) {
2847                         __swab64s(&cs->cs_recno);
2848                         __swab32s(&cs->cs_id);
2849                 }
2850
2851                 if (!mdt_changelog_allow(tsi2mdt_info(tsi)))
2852                         RETURN(-EACCES);
2853                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
2854                                    vallen, val, NULL);
2855         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2856                 if (vallen > 0)
2857                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
2858         } else {
2859                 RETURN(-EINVAL);
2860         }
2861         RETURN(rc);
2862 }
2863
2864 static int mdt_readpage(struct tgt_session_info *tsi)
2865 {
2866         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
2867         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
2868         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
2869         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
2870         struct mdt_body         *repbody;
2871         int                      rc;
2872         int                      i;
2873
2874         ENTRY;
2875
2876         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
2877                 RETURN(err_serious(-ENOMEM));
2878
2879         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
2880         if (repbody == NULL || reqbody == NULL)
2881                 RETURN(err_serious(-EFAULT));
2882
2883         /*
2884          * prepare @rdpg before calling lower layers and transfer itself. Here
2885          * reqbody->size contains offset of where to start to read and
2886          * reqbody->nlink contains number bytes to read.
2887          */
2888         rdpg->rp_hash = reqbody->mbo_size;
2889         if (rdpg->rp_hash != reqbody->mbo_size) {
2890                 CERROR("Invalid hash: %#llx != %#llx\n",
2891                        rdpg->rp_hash, reqbody->mbo_size);
2892                 RETURN(-EFAULT);
2893         }
2894
2895         rdpg->rp_attrs = reqbody->mbo_mode;
2896         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
2897                 rdpg->rp_attrs |= LUDA_64BITHASH;
2898         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
2899                                 exp_max_brw_size(tsi->tsi_exp));
2900         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >>
2901                           PAGE_SHIFT;
2902         OBD_ALLOC_PTR_ARRAY_LARGE(rdpg->rp_pages, rdpg->rp_npages);
2903         if (rdpg->rp_pages == NULL)
2904                 RETURN(-ENOMEM);
2905
2906         for (i = 0; i < rdpg->rp_npages; ++i) {
2907                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
2908                 if (rdpg->rp_pages[i] == NULL)
2909                         GOTO(free_rdpg, rc = -ENOMEM);
2910         }
2911
2912         /* call lower layers to fill allocated pages with directory data */
2913         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
2914         if (rc < 0)
2915                 GOTO(free_rdpg, rc);
2916
2917         /* send pages to client */
2918         rc = tgt_sendpage(tsi, rdpg, rc);
2919
2920         EXIT;
2921 free_rdpg:
2922
2923         for (i = 0; i < rdpg->rp_npages; i++)
2924                 if (rdpg->rp_pages[i] != NULL)
2925                         __free_page(rdpg->rp_pages[i]);
2926         OBD_FREE_PTR_ARRAY_LARGE(rdpg->rp_pages, rdpg->rp_npages);
2927
2928         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
2929                 RETURN(0);
2930
2931         return rc;
2932 }
2933
2934 static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
2935 {
2936         struct lu_ucred *uc = mdt_ucred_check(info);
2937         struct lu_attr *attr = &info->mti_attr.ma_attr;
2938
2939         if (uc == NULL)
2940                 return -EINVAL;
2941
2942         if (op != REINT_SETATTR) {
2943                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
2944                         attr->la_uid = uc->uc_fsuid;
2945                 /* for S_ISGID, inherit gid from his parent, such work will be
2946                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
2947                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
2948                         attr->la_gid = uc->uc_fsgid;
2949         }
2950
2951         return 0;
2952 }
2953
2954 static inline bool mdt_is_readonly_open(struct mdt_thread_info *info, __u32 op)
2955 {
2956         return op == REINT_OPEN &&
2957              !(info->mti_spec.sp_cr_flags & (MDS_FMODE_WRITE | MDS_OPEN_CREAT));
2958 }
2959
2960 static void mdt_preset_secctx_size(struct mdt_thread_info *info)
2961 {
2962         struct req_capsule *pill = info->mti_pill;
2963
2964         if (req_capsule_has_field(pill, &RMF_FILE_SECCTX,
2965                                   RCL_SERVER) &&
2966             req_capsule_has_field(pill, &RMF_FILE_SECCTX_NAME,
2967                                   RCL_CLIENT)) {
2968                 if (req_capsule_get_size(pill, &RMF_FILE_SECCTX_NAME,
2969                                          RCL_CLIENT) != 0)
2970                         /* pre-set size in server part with max size */
2971                         req_capsule_set_size(pill, &RMF_FILE_SECCTX,
2972                                              RCL_SERVER,
2973                                              req_capsule_ptlreq(pill) ?
2974                                              OBD_MAX_DEFAULT_EA_SIZE :
2975                                              MAX_MD_SIZE_OLD);
2976                 else
2977                         req_capsule_set_size(pill, &RMF_FILE_SECCTX,
2978                                              RCL_SERVER, 0);
2979         }
2980 }
2981
2982 static int mdt_reint_internal(struct mdt_thread_info *info,
2983                               struct mdt_lock_handle *lhc,
2984                               __u32 op)
2985 {
2986         struct req_capsule      *pill = info->mti_pill;
2987         struct mdt_body         *repbody;
2988         int                      rc = 0, rc2;
2989
2990         ENTRY;
2991
2992         rc = mdt_reint_unpack(info, op);
2993         if (rc != 0) {
2994                 CERROR("Can't unpack reint, rc %d\n", rc);
2995                 RETURN(err_serious(rc));
2996         }
2997
2998
2999         /* check if the file system is set to readonly. O_RDONLY open
3000          * is still allowed even the file system is set to readonly mode */
3001         if (mdt_rdonly(info->mti_exp) && !mdt_is_readonly_open(info, op))
3002                 RETURN(err_serious(-EROFS));
3003
3004         /* for replay (no_create) lmm is not needed, client has it already */
3005         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3006                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
3007                                      DEF_REP_MD_SIZE);
3008
3009         /* llog cookies are always 0, the field is kept for compatibility */
3010         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
3011                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
3012
3013         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
3014          * by default. If the target object has more ACL entries, then
3015          * enlarge the buffer when necessary. */
3016         if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
3017                 req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
3018                                      LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
3019
3020         mdt_preset_secctx_size(info);
3021         mdt_preset_encctx_size(info);
3022
3023         rc = req_capsule_server_pack(pill);
3024         if (rc != 0) {
3025                 CERROR("Can't pack response, rc %d\n", rc);
3026                 RETURN(err_serious(rc));
3027         }
3028
3029         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
3030                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
3031                 LASSERT(repbody);
3032                 repbody->mbo_eadatasize = 0;
3033                 repbody->mbo_aclsize = 0;
3034         }
3035
3036         CFS_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
3037
3038         /* for replay no cookkie / lmm need, because client have this already */
3039         if (info->mti_spec.no_create)
3040                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3041                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
3042
3043         rc = mdt_init_ucred_reint(info);
3044         if (rc)
3045                 GOTO(out_shrink, rc);
3046
3047         rc = mdt_fix_attr_ucred(info, op);
3048         if (rc != 0)
3049                 GOTO(out_ucred, rc = err_serious(rc));
3050
3051         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
3052         if (rc < 0) {
3053                 GOTO(out_ucred, rc);
3054         } else if (rc == 1) {
3055                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt");
3056                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
3057                 GOTO(out_ucred, rc);
3058         }
3059         rc = mdt_reint_rec(info, lhc);
3060         EXIT;
3061 out_ucred:
3062         mdt_exit_ucred(info);
3063 out_shrink:
3064         mdt_client_compatibility(info);
3065
3066         rc2 = mdt_fix_reply(info);
3067         if (rc == 0)
3068                 rc = rc2;
3069
3070         /*
3071          * Data-on-MDT optimization - read data along with OPEN and return it
3072          * in reply when possible.
3073          */
3074         if (rc == 0 && op == REINT_OPEN && !req_is_replay(pill->rc_req))
3075                 rc = mdt_dom_read_on_open(info, info->mti_mdt,
3076                                           &lhc->mlh_reg_lh);
3077
3078         return rc;
3079 }
3080
3081 static long mdt_reint_opcode(struct ptlrpc_request *req,
3082                              const struct req_format **fmt)
3083 {
3084         struct mdt_device       *mdt;
3085         struct mdt_rec_reint    *rec;
3086         long                     opc;
3087
3088         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
3089         if (rec != NULL) {
3090                 opc = rec->rr_opcode;
3091                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
3092                 if (opc < REINT_MAX && fmt[opc] != NULL)
3093                         req_capsule_extend(&req->rq_pill, fmt[opc]);
3094                 else {
3095                         mdt = mdt_exp2dev(req->rq_export);
3096                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
3097                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
3098                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
3099                         opc = err_serious(-EFAULT);
3100                 }
3101         } else {
3102                 opc = err_serious(-EFAULT);
3103         }
3104         return opc;
3105 }
3106
3107 static int mdt_reint(struct tgt_session_info *tsi)
3108 {
3109         long opc;
3110         int  rc;
3111         static const struct req_format *reint_fmts[REINT_MAX] = {
3112                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
3113                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
3114                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
3115                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
3116                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
3117                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
3118                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
3119                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
3120                 [REINT_MIGRATE]  = &RQF_MDS_REINT_MIGRATE,
3121                 [REINT_RESYNC]   = &RQF_MDS_REINT_RESYNC,
3122         };
3123
3124         ENTRY;
3125
3126         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
3127         if (opc >= 0) {
3128                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
3129                 /*
3130                  * No lock possible here from client to pass it to reint code
3131                  * path.
3132                  */
3133                 rc = mdt_reint_internal(info, NULL, opc);
3134                 mdt_thread_info_fini(info);
3135         } else {
3136                 rc = opc;
3137         }
3138
3139         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
3140         RETURN(rc);
3141 }
3142
3143 /* this should sync the whole device */
3144 int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
3145 {
3146         struct dt_device *dt = mdt->mdt_bottom;
3147         int rc;
3148         ENTRY;
3149
3150         rc = dt->dd_ops->dt_sync(env, dt);
3151         RETURN(rc);
3152 }
3153
3154 /* this should sync this object */
3155 static int mdt_object_sync(const struct lu_env *env, struct obd_export *exp,
3156                            struct mdt_object *mo)
3157 {
3158         int rc = 0;
3159
3160         ENTRY;
3161
3162         if (!mdt_object_exists(mo)) {
3163                 CWARN("%s: non existing object "DFID": rc = %d\n",
3164                       exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
3165                       -ESTALE);
3166                 RETURN(-ESTALE);
3167         }
3168
3169         if (S_ISREG(lu_object_attr(&mo->mot_obj))) {
3170                 struct lu_target *tgt = tgt_ses_info(env)->tsi_tgt;
3171                 dt_obj_version_t version;
3172
3173                 version = dt_version_get(env, mdt_obj2dt(mo));
3174                 if (version > tgt->lut_obd->obd_last_committed)
3175                         rc = mo_object_sync(env, mdt_object_child(mo));
3176         } else {
3177                 rc = mo_object_sync(env, mdt_object_child(mo));
3178         }
3179
3180         RETURN(rc);
3181 }
3182
3183 static int mdt_sync(struct tgt_session_info *tsi)
3184 {
3185         struct ptlrpc_request   *req = tgt_ses_req(tsi);
3186         struct req_capsule      *pill = tsi->tsi_pill;
3187         struct mdt_body         *body;
3188         ktime_t                  kstart = ktime_get();
3189         int                      rc;
3190
3191         ENTRY;
3192
3193         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
3194                 RETURN(err_serious(-ENOMEM));
3195
3196         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
3197                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
3198         } else {
3199                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
3200
3201                 if (unlikely(info->mti_object == NULL))
3202                         RETURN(-EPROTO);
3203
3204                 /* sync an object */
3205                 rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp,
3206                                      info->mti_object);
3207                 if (rc == 0) {
3208                         const struct lu_fid *fid;
3209                         struct lu_attr *la = &info->mti_attr.ma_attr;
3210
3211                         info->mti_attr.ma_need = MA_INODE;
3212                         info->mti_attr.ma_valid = 0;
3213                         rc = mdt_attr_get_complex(info, info->mti_object,
3214                                                   &info->mti_attr);
3215                         if (rc == 0) {
3216                                 body = req_capsule_server_get(pill,
3217                                                               &RMF_MDT_BODY);
3218                                 fid = mdt_object_fid(info->mti_object);
3219                                 mdt_pack_attr2body(info, body, la, fid);
3220                         }
3221                 }
3222                 mdt_thread_info_fini(info);
3223         }
3224         if (rc == 0)
3225                 mdt_counter_incr(req, LPROC_MDT_SYNC,
3226                                  ktime_us_delta(ktime_get(), kstart));
3227
3228         RETURN(rc);
3229 }
3230
3231 static int mdt_data_sync(struct tgt_session_info *tsi)
3232 {
3233         struct mdt_thread_info *info;
3234         struct mdt_device *mdt = mdt_exp2dev(tsi->tsi_exp);
3235         struct ost_body *body = tsi->tsi_ost_body;
3236         struct ost_body *repbody;
3237         struct mdt_object *mo = NULL;
3238         struct md_attr *ma;
3239         int rc = 0;
3240
3241         ENTRY;
3242
3243         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
3244
3245         /* if no fid is specified then do nothing,
3246          * device sync is done via MDS_SYNC */
3247         if (fid_is_zero(&tsi->tsi_fid))
3248                 RETURN(0);
3249
3250         mo = mdt_object_find(tsi->tsi_env, mdt, &tsi->tsi_fid);
3251         if (IS_ERR(mo))
3252                 RETURN(PTR_ERR(mo));
3253
3254         rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp, mo);
3255         if (rc)
3256                 GOTO(put, rc);
3257
3258         repbody->oa.o_oi = body->oa.o_oi;
3259         repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
3260
3261         info = tsi2mdt_info(tsi);
3262         ma = &info->mti_attr;
3263         ma->ma_need = MA_INODE;
3264         ma->ma_valid = 0;
3265         rc = mdt_attr_get_complex(info, mo, ma);
3266         if (rc == 0)
3267                 obdo_from_la(&repbody->oa, &ma->ma_attr, VALID_FLAGS);
3268         else
3269                 rc = 0;
3270         mdt_thread_info_fini(info);
3271
3272         EXIT;
3273 put:
3274         if (mo != NULL)
3275                 mdt_object_put(tsi->tsi_env, mo);
3276         return rc;
3277 }
3278
3279 /*
3280  * Handle quota control requests to consult current usage/limit, but also
3281  * to configure quota enforcement
3282  */
3283 static int mdt_quotactl(struct tgt_session_info *tsi)
3284 {
3285         struct obd_export *exp  = tsi->tsi_exp;
3286         struct req_capsule *pill = tsi->tsi_pill;
3287         struct obd_quotactl *oqctl, *repoqc;
3288         int id, rc;
3289         struct mdt_device *mdt = mdt_exp2dev(exp);
3290         struct lu_device *qmt = mdt->mdt_qmt_dev;
3291         struct lu_nodemap *nodemap;
3292         ENTRY;
3293
3294         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
3295         if (!oqctl)
3296                 RETURN(err_serious(-EPROTO));
3297
3298         rc = req_capsule_server_pack(pill);
3299         if (rc)
3300                 RETURN(err_serious(rc));
3301
3302         nodemap = nodemap_get_from_exp(exp);
3303         if (IS_ERR(nodemap))
3304                 RETURN(PTR_ERR(nodemap));
3305
3306         switch (oqctl->qc_cmd) {
3307                 /* master quotactl */
3308         case Q_SETINFO:
3309         case Q_SETQUOTA:
3310         case LUSTRE_Q_SETDEFAULT:
3311         case LUSTRE_Q_SETQUOTAPOOL:
3312         case LUSTRE_Q_SETINFOPOOL:
3313         case LUSTRE_Q_SETDEFAULT_POOL:
3314         case LUSTRE_Q_DELETEQID:
3315         case LUSTRE_Q_RESETQID:
3316                 if (!nodemap_can_setquota(nodemap, oqctl->qc_type,
3317                                           oqctl->qc_id))
3318                         GOTO(out_nodemap, rc = -EPERM);
3319                 fallthrough;
3320         case Q_GETINFO:
3321         case Q_GETQUOTA:
3322         case LUSTRE_Q_GETDEFAULT:
3323         case LUSTRE_Q_GETQUOTAPOOL:
3324         case LUSTRE_Q_GETINFOPOOL:
3325         case LUSTRE_Q_GETDEFAULT_POOL:
3326                 if (qmt == NULL)
3327                         GOTO(out_nodemap, rc = -EOPNOTSUPP);
3328                 /* slave quotactl */
3329                 fallthrough;
3330         case Q_GETOINFO:
3331         case Q_GETOQUOTA:
3332                 break;
3333         default:
3334                 rc = -EFAULT;
3335                 CERROR("%s: unsupported quotactl command %d: rc = %d\n",
3336                        mdt_obd_name(mdt), oqctl->qc_cmd, rc);
3337                 GOTO(out_nodemap, rc);
3338         }
3339
3340         id = oqctl->qc_id;
3341         switch (oqctl->qc_type) {
3342         case USRQUOTA:
3343                 id = nodemap_map_id(nodemap, NODEMAP_UID,
3344                                     NODEMAP_CLIENT_TO_FS, id);
3345                 break;
3346         case GRPQUOTA:
3347                 id = nodemap_map_id(nodemap, NODEMAP_GID,
3348                                     NODEMAP_CLIENT_TO_FS, id);
3349                 break;
3350         case PRJQUOTA:
3351                 id = nodemap_map_id(nodemap, NODEMAP_PROJID,
3352                                     NODEMAP_CLIENT_TO_FS, id);
3353                 break;
3354         default:
3355                 GOTO(out_nodemap, rc = -EOPNOTSUPP);
3356         }
3357         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
3358         if (repoqc == NULL)
3359                 GOTO(out_nodemap, rc = err_serious(-EFAULT));
3360
3361         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA)
3362                 barrier_exit(tsi->tsi_tgt->lut_bottom);
3363
3364         if (oqctl->qc_id != id)
3365                 swap(oqctl->qc_id, id);
3366
3367         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA) {
3368                 if (unlikely(!barrier_entry(tsi->tsi_tgt->lut_bottom)))
3369                         RETURN(-EINPROGRESS);
3370         }
3371
3372         switch (oqctl->qc_cmd) {
3373
3374         case Q_GETINFO:
3375         case Q_SETINFO:
3376         case Q_SETQUOTA:
3377         case Q_GETQUOTA:
3378         case LUSTRE_Q_SETDEFAULT:
3379         case LUSTRE_Q_GETDEFAULT:
3380         case LUSTRE_Q_SETQUOTAPOOL:
3381         case LUSTRE_Q_GETQUOTAPOOL:
3382         case LUSTRE_Q_SETINFOPOOL:
3383         case LUSTRE_Q_GETINFOPOOL:
3384         case LUSTRE_Q_SETDEFAULT_POOL:
3385         case LUSTRE_Q_GETDEFAULT_POOL:
3386         case LUSTRE_Q_DELETEQID:
3387         case LUSTRE_Q_RESETQID:
3388                 /* forward quotactl request to QMT */
3389                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
3390                 break;
3391
3392         case Q_GETOINFO:
3393         case Q_GETOQUOTA:
3394                 /* slave quotactl */
3395                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
3396                                    oqctl);
3397                 break;
3398
3399         default:
3400                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
3401                 GOTO(out_nodemap, rc = -EFAULT);
3402         }
3403
3404         if (oqctl->qc_id != id)
3405                 swap(oqctl->qc_id, id);
3406
3407         QCTL_COPY_NO_PNAME(repoqc, oqctl);
3408         EXIT;
3409
3410 out_nodemap:
3411         nodemap_putref(nodemap);
3412
3413         return rc;
3414 }
3415
3416 /** clone llog ctxt from child (mdd)
3417  * This allows remote llog (replicator) access.
3418  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
3419  * context was originally set up, or we can handle them directly.
3420  * I choose the latter, but that means I need any llog
3421  * contexts set up by child to be accessable by the mdt.  So we clone the
3422  * context into our context list here.
3423  */
3424 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
3425                                int idx)
3426 {
3427         struct md_device  *next = mdt->mdt_child;
3428         struct llog_ctxt *ctxt;
3429         int rc;
3430
3431         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
3432                 return 0;
3433
3434         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
3435         if (rc || ctxt == NULL) {
3436                 return 0;
3437         }
3438
3439         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
3440         if (rc)
3441                 CERROR("Can't set mdt ctxt %d\n", rc);
3442
3443         return rc;
3444 }
3445
3446 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
3447                                  struct mdt_device *mdt, int idx)
3448 {
3449         struct llog_ctxt *ctxt;
3450
3451         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
3452         if (ctxt == NULL)
3453                 return 0;
3454         /* Put once for the get we just did, and once for the clone */
3455         llog_ctxt_put(ctxt);
3456         llog_ctxt_put(ctxt);
3457         return 0;
3458 }
3459
3460 /*
3461  * sec context handlers
3462  */
3463 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
3464 {
3465         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
3466
3467         return 0;
3468 }
3469
3470 /*
3471  * quota request handlers
3472  */
3473 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
3474 {
3475         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
3476         struct lu_device        *qmt = mdt->mdt_qmt_dev;
3477         int                      rc;
3478         ENTRY;
3479
3480         if (qmt == NULL)
3481                 RETURN(err_serious(-EOPNOTSUPP));
3482
3483         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
3484         RETURN(rc);
3485 }
3486
3487 struct mdt_object *mdt_object_new(const struct lu_env *env,
3488                                   struct mdt_device *d,
3489                                   const struct lu_fid *f)
3490 {
3491         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
3492         struct lu_object *o;
3493         struct mdt_object *m;
3494         ENTRY;
3495
3496         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
3497         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
3498         if (unlikely(IS_ERR(o)))
3499                 m = (struct mdt_object *)o;
3500         else
3501                 m = mdt_obj(o);
3502         RETURN(m);
3503 }
3504
3505 struct mdt_object *mdt_object_find(const struct lu_env *env,
3506                                    struct mdt_device *d,
3507                                    const struct lu_fid *f)
3508 {
3509         struct lu_object *o;
3510         struct mdt_object *m;
3511         ENTRY;
3512
3513         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
3514         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
3515         if (unlikely(IS_ERR(o)))
3516                 m = (struct mdt_object *)o;
3517         else
3518                 m = mdt_obj(o);
3519
3520         RETURN(m);
3521 }
3522
3523 /**
3524  * Asyncronous commit for mdt device.
3525  *
3526  * Pass asynchonous commit call down the MDS stack.
3527  *
3528  * \param env environment
3529  * \param mdt the mdt device
3530  */
3531 static void mdt_device_commit_async(const struct lu_env *env,
3532                                     struct mdt_device *mdt)
3533 {
3534         struct dt_device *dt = mdt->mdt_bottom;
3535         int rc;
3536         ENTRY;
3537
3538         rc = dt->dd_ops->dt_commit_async(env, dt);
3539         if (unlikely(rc != 0))
3540                 CWARN("%s: async commit start failed: rc = %d\n",
3541                       mdt_obd_name(mdt), rc);
3542         atomic_inc(&mdt->mdt_async_commit_count);
3543         EXIT;
3544 }
3545
3546 /**
3547  * Mark the lock as "synchonous".
3548  *
3549  * Mark the lock to deffer transaction commit to the unlock time.
3550  *
3551  * \param lock the lock to mark as "synchonous"
3552  *
3553  * \see mdt_is_lock_sync
3554  * \see mdt_save_lock
3555  */
3556 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
3557 {
3558         lock->l_ast_data = (void*)1;
3559 }
3560
3561 /**
3562  * Check whehter the lock "synchonous" or not.
3563  *
3564  * \param lock the lock to check
3565  * \retval 1 the lock is "synchonous"
3566  * \retval 0 the lock isn't "synchronous"
3567  *
3568  * \see mdt_set_lock_sync
3569  * \see mdt_save_lock
3570  */
3571 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
3572 {
3573         return lock->l_ast_data != NULL;
3574 }
3575
3576 /**
3577  * Blocking AST for mdt locks.
3578  *
3579  * Starts transaction commit if in case of COS lock conflict or
3580  * deffers such a commit to the mdt_save_lock.
3581  *
3582  * \param lock the lock which blocks a request or cancelling lock
3583  * \param desc unused
3584  * \param data unused
3585  * \param flag indicates whether this cancelling or blocking callback
3586  * \retval 0
3587  * \see ldlm_blocking_ast_nocheck
3588  */
3589 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
3590                      void *data, int flag)
3591 {
3592         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
3593         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
3594         struct ldlm_cb_set_arg *arg = data;
3595         bool commit_async = false;
3596         int rc;
3597
3598         ENTRY;
3599         if (flag == LDLM_CB_CANCELING)
3600                 RETURN(0);
3601
3602         lock_res_and_lock(lock);
3603         if (lock->l_blocking_ast != mdt_blocking_ast) {
3604                 unlock_res_and_lock(lock);
3605                 RETURN(0);
3606         }
3607
3608         /* A blocking ast may be sent from ldlm_lock_decref_internal
3609          * when the last reference to a local lock was released and
3610          * during blocking event from ldlm_work_bl_ast_lock().
3611          * The 'data' parameter is l_ast_data in the first case and
3612          * callback arguments in the second one. Distinguish them by that.
3613          */
3614         if (data && data != lock->l_ast_data && arg->bl_desc) {
3615                 if (lock->l_req_mode & (LCK_COS | LCK_TXN))
3616                         commit_async = true;
3617                 else if ((lock->l_req_mode & (LCK_PW | LCK_EX)) &&
3618                          ((mdt_cos_is_enabled(mdt) &&
3619                              !arg->bl_desc->bl_same_client) ||
3620                           (mdt_slc_is_enabled(mdt) &&
3621                              arg->bl_desc->bl_txn_dependent)))
3622                         mdt_set_lock_sync(lock);
3623         }
3624
3625         rc = ldlm_blocking_ast_nocheck(lock);
3626
3627         if (commit_async) {
3628                 struct lu_env env;
3629
3630                 rc = lu_env_init(&env, LCT_LOCAL);
3631                 if (unlikely(rc != 0))
3632                         CWARN("%s: lu_env initialization failed, cannot "
3633                               "start asynchronous commit: rc = %d\n",
3634                               obd->obd_name, rc);
3635                 else
3636                         mdt_device_commit_async(&env, mdt);
3637                 lu_env_fini(&env);
3638         }
3639         RETURN(rc);
3640 }
3641
3642 /*
3643  * Blocking AST for cross-MDT lock
3644  *
3645  * Discard lock from uncommitted_slc_locks and cancel it.
3646  *
3647  * \param lock  the lock which blocks a request or cancelling lock
3648  * \param desc  unused
3649  * \param data  unused
3650  * \param flag  indicates whether this cancelling or blocking callback
3651  * \retval      0 on success
3652  * \retval      negative number on error
3653  */
3654 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
3655                             void *data, int flag)
3656 {
3657         int rc = 0;
3658         ENTRY;
3659
3660         switch (flag) {
3661         case LDLM_CB_BLOCKING: {
3662                 struct lustre_handle lockh;
3663
3664                 ldlm_lock2handle(lock, &lockh);
3665                 rc = ldlm_cli_cancel(&lockh,
3666                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
3667                 if (rc < 0) {
3668                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
3669                         RETURN(rc);
3670                 }
3671                 break;
3672         }
3673         case LDLM_CB_CANCELING: {
3674                 struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
3675                 struct mdt_device *mdt =
3676                                 mdt_dev(obd->obd_lu_dev->ld_site->ls_top_dev);
3677
3678                 LDLM_DEBUG(lock, "Revoke remote lock");
3679
3680                 /* discard slc lock here so that it can be cleaned anytime,
3681                  * especially for cleanup_resource() */
3682                 tgt_discard_slc_lock(&mdt->mdt_lut, lock);
3683
3684                 /* once we cache lock, l_ast_data is set to mdt_object */
3685                 if (lock->l_ast_data != NULL) {
3686                         struct mdt_object *mo = lock->l_ast_data;
3687                         struct lu_env env;
3688
3689                         rc = lu_env_init(&env, LCT_MD_THREAD);
3690                         if (unlikely(rc != 0)) {
3691                                 CWARN("%s: lu_env initialization failed, object %p "DFID" is leaked!: rc = %d\n",
3692                                       obd->obd_name, mo,
3693                                       PFID(mdt_object_fid(mo)), rc);
3694                                 RETURN(rc);
3695                         }
3696
3697                         if (lock->l_policy_data.l_inodebits.bits &
3698                             (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)) {
3699                                 rc = mo_invalidate(&env, mdt_object_child(mo));
3700                                 mo->mot_cache_attr = 0;
3701                         }
3702                         mdt_object_put(&env, mo);
3703                         lu_env_fini(&env);
3704                 }
3705                 break;
3706         }
3707         default:
3708                 LBUG();
3709         }
3710
3711         RETURN(rc);
3712 }
3713
3714 int mdt_check_resent_lock(struct mdt_thread_info *info,
3715                           struct mdt_object *mo,
3716                           struct mdt_lock_handle *lhc)
3717 {
3718         /* the lock might already be gotten in ldlm_handle_enqueue() */
3719         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
3720                 struct ptlrpc_request *req = mdt_info_req(info);
3721                 struct ldlm_lock      *lock;
3722
3723                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
3724                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
3725                 if (lock == NULL) {
3726                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
3727                          * a resend case, however, it could be already destroyed
3728                          * due to client eviction or a raced cancel RPC. */
3729                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
3730                                           lhc->mlh_reg_lh.cookie);
3731                         RETURN(-ESTALE);
3732                 }
3733
3734                 if (!fid_res_name_eq(mdt_object_fid(mo),
3735                                      &lock->l_resource->lr_name)) {
3736                         CWARN("%s: Although resent, but still not "
3737                               "get child lock:"DFID"\n",
3738                               info->mti_exp->exp_obd->obd_name,
3739                               PFID(mdt_object_fid(mo)));
3740                         LDLM_LOCK_PUT(lock);
3741                         RETURN(-EPROTO);
3742                 }
3743                 LDLM_LOCK_PUT(lock);
3744                 return 0;
3745         }
3746         return 1;
3747 }
3748
3749 static void mdt_remote_object_lock_created_cb(struct ldlm_lock *lock)
3750 {
3751         mdt_object_get(NULL, lock->l_ast_data);
3752 }
3753
3754 static int mdt_remote_object_lock_try(struct mdt_thread_info *mti,
3755                                       struct mdt_object *obj,
3756                                       struct lustre_handle *lh,
3757                                       enum ldlm_mode mode,
3758                                       union ldlm_policy_data *policy,
3759                                       struct ldlm_res_id *res_id,
3760                                       bool cache)
3761 {
3762         struct ldlm_enqueue_info *einfo = &mti->mti_remote_einfo;
3763         int rc;
3764
3765         LASSERT(mdt_object_remote(obj));
3766
3767         memset(einfo, 0, sizeof(*einfo));
3768         einfo->ei_type = LDLM_IBITS;
3769         einfo->ei_mode = mode;
3770         einfo->ei_cb_bl = mdt_remote_blocking_ast;
3771         einfo->ei_cb_cp = ldlm_completion_ast;
3772         einfo->ei_enq_slave = 0;
3773         einfo->ei_res_id = res_id;
3774         einfo->ei_req_slot = 1;
3775         if (cache) {
3776                 /*
3777                  * if we cache lock, couple lock with mdt_object, so that object
3778                  * can be easily found in lock ASTs.
3779                  */
3780                 einfo->ei_cbdata = obj;
3781                 einfo->ei_cb_created = mdt_remote_object_lock_created_cb;
3782         }
3783
3784         rc = mo_object_lock(mti->mti_env, mdt_object_child(obj), lh, einfo,
3785                             policy);
3786         if (rc) {
3787                 lh->cookie = 0ull;
3788                 return rc;
3789         }
3790
3791         /* other components like LFSCK can use lockless access
3792          * and populate cache, so we better invalidate it
3793          */
3794         if (policy->l_inodebits.bits &
3795             (MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR))
3796                 mo_invalidate(mti->mti_env, mdt_object_child(obj));
3797
3798         return 0;
3799 }
3800
3801 /*
3802  * Helper function to take PDO and hash lock.
3803  *
3804  * if \a pdo_lock is false, don't take PDO lock, this is case in rename.
3805  */
3806 int mdt_object_pdo_lock(struct mdt_thread_info *info, struct mdt_object *obj,
3807                         struct mdt_lock_handle *lh, const struct lu_name *name,
3808                         enum ldlm_mode mode, bool pdo_lock)
3809 {
3810         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
3811         union ldlm_policy_data *policy = &info->mti_policy;
3812         struct ldlm_res_id *res_id = &info->mti_res_id;
3813         /*
3814          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it is never going to
3815          * be sent to client and we do not want it slowed down due to possible
3816          * cancels.
3817          */
3818         __u64 dlmflags = LDLM_FL_ATOMIC_CB;
3819         __u64 *cookie = NULL;
3820         int rc;
3821
3822         LASSERT(obj);
3823
3824         /* check for exists after object is locked */
3825         if (!mdt_object_exists(obj))
3826                 /* Non-existent object shouldn't have PDO lock */
3827                 return -ESTALE;
3828
3829         /* Non-dir object shouldn't have PDO lock */
3830         if (!S_ISDIR(lu_object_attr(&obj->mot_obj)))
3831                 return -ENOTDIR;
3832
3833         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
3834         policy->l_inodebits.try_bits = 0;
3835         policy->l_inodebits.li_gid = 0;
3836         policy->l_inodebits.li_initiator_id = mdt_node_id(info->mti_mdt);
3837         fid_build_reg_res_name(mdt_object_fid(obj), res_id);
3838         if (info->mti_exp)
3839                 cookie = &info->mti_exp->exp_handle.h_cookie;
3840
3841         mdt_lock_pdo_init(lh, mode, name);
3842         mdt_lock_pdo_mode(info, obj, lh);
3843         if (lh->mlh_pdo_mode != LCK_NL) {
3844                 if (pdo_lock) {
3845                         if (mdt_object_remote(obj)) {
3846                                 rc = mdt_remote_object_lock_try(info, obj,
3847                                         &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
3848                                         policy, res_id, false);
3849                                 lh->mlh_pdo_remote = 1;
3850                         } else {
3851                                 rc = mdt_fid_lock(info->mti_env, ns,
3852                                         &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
3853                                         policy, res_id, dlmflags, cookie);
3854                         }
3855                         if (rc) {
3856                                 mdt_object_unlock(info, obj, lh, 1);
3857                                 return rc;
3858                         }
3859                 }
3860                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
3861         }
3862
3863         if (mdt_object_remote(obj))
3864                 rc = mdt_remote_object_lock_try(info, obj, &lh->mlh_rreg_lh,
3865                         lh->mlh_rreg_mode, policy, res_id, false);
3866         else
3867                 rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_reg_lh,
3868                         lh->mlh_reg_mode, policy, res_id, dlmflags, cookie);
3869         if (rc)
3870                 mdt_object_unlock(info, obj, lh, 1);
3871         else if (CFS_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK) &&
3872                    lh->mlh_pdo_hash != 0 &&
3873                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
3874                 CFS_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
3875
3876         return rc;
3877 }
3878
3879 int mdt_object_lock_internal(struct mdt_thread_info *info,
3880                              struct mdt_object *obj, const struct lu_fid *fid,
3881                              struct mdt_lock_handle *lh, __u64 *ibits,
3882                              __u64 trybits, bool cache)
3883 {
3884         union ldlm_policy_data *policy = &info->mti_policy;
3885         struct ldlm_res_id *res_id = &info->mti_res_id;
3886         struct lustre_handle *handle;
3887         int rc;
3888
3889         policy->l_inodebits.bits = *ibits;
3890         policy->l_inodebits.try_bits = trybits;
3891         policy->l_inodebits.li_gid = lh->mlh_gid;
3892         policy->l_inodebits.li_initiator_id = mdt_node_id(info->mti_mdt);
3893         fid_build_reg_res_name(fid, res_id);
3894
3895         if (obj && mdt_object_remote(obj)) {
3896                 handle = &lh->mlh_rreg_lh;
3897                 LASSERT(!lustre_handle_is_used(handle));
3898                 LASSERT(lh->mlh_rreg_mode != LCK_MINMODE);
3899                 LASSERT(lh->mlh_type != MDT_NUL_LOCK);
3900                 rc = mdt_remote_object_lock_try(info, obj, handle,
3901                                                 lh->mlh_rreg_mode, policy,
3902                                                 res_id, cache);
3903         } else {
3904                 struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
3905                 /*
3906                  * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if
3907                  * it is going to be sent to client. If it is -
3908                  * mdt_intent_policy() path will fix it up and turn FL_LOCAL
3909                  * flag off.
3910                  */
3911                 __u64 dlmflags = LDLM_FL_ATOMIC_CB | LDLM_FL_LOCAL_ONLY;
3912                 __u64 *cookie = NULL;
3913
3914                 handle = &lh->mlh_reg_lh;
3915                 LASSERT(!lustre_handle_is_used(handle));
3916                 LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
3917                 LASSERT(lh->mlh_type != MDT_NUL_LOCK);
3918
3919                 /* Lease lock are granted with LDLM_FL_CANCEL_ON_BLOCK */
3920                 if (lh->mlh_type == MDT_REG_LOCK &&
3921                     lh->mlh_reg_mode == LCK_EX && *ibits == MDS_INODELOCK_OPEN)
3922                         dlmflags |= LDLM_FL_CANCEL_ON_BLOCK;
3923
3924
3925                 if (info->mti_exp)
3926                         cookie = &info->mti_exp->exp_handle.h_cookie;
3927
3928                 rc = mdt_fid_lock(info->mti_env, ns, handle, lh->mlh_reg_mode,
3929                                   policy, res_id, dlmflags, cookie);
3930                 if (rc)
3931                         mdt_object_unlock(info, obj, lh, 1);
3932         }
3933
3934         if (rc == 0) {
3935                 struct ldlm_lock *lock;
3936
3937                 /* Return successfully acquired bits to a caller */
3938                 lock = ldlm_handle2lock(handle);
3939                 LASSERT(lock);
3940                 *ibits = lock->l_policy_data.l_inodebits.bits;
3941                 LDLM_LOCK_PUT(lock);
3942         }
3943
3944         return rc;
3945 }
3946
3947 /*
3948  * MDT object locking functions:
3949  * mdt_object_lock(): lock object, this is used in most places, and normally
3950  *      lock ibits doesn't contain LOOKUP, unless the caller knows it's not
3951  *      remote object.
3952  * mdt_object_check_lock(): lock object with LOOKUP and other ibits, it needs
3953  *      to check whether parent is on remote MDT, if so, take LOOKUP on parent
3954  *      MDT separately, and then lock other ibits on child object.
3955  * mdt_parent_lock(): take parent UPDATE lock with specific mode, if parent is
3956  *      local, take PDO lock by name hash, otherwise take regular lock.
3957  * mdt_object_stripes_lock(): lock object which should be local, and if it's a
3958  *      striped directory, lock its stripes, this is called in operations which
3959  *      modify both object and stripes.
3960  * mdt_object_lock_try(): lock object with trybits, the trybits contains
3961  *      optional inode lock bits that can be granted. This is called by
3962  *      getattr/open to fetch more inode lock bits to client, and is also called
3963  *      by dir migration to lock link parent in non-block mode to avoid
3964  *      deadlock.
3965  */
3966
3967 /**
3968  * lock object
3969  *
3970  * this is used to lock object in most places, and normally lock ibits doesn't
3971  * contain LOOKUP, unless the caller knows it's not remote object.
3972  *
3973  * \param info          struct mdt_thread_info
3974  * \param obj           object
3975  * \param lh            lock handle
3976  * \param ibits         MDS inode lock bits
3977  * \param mode          lock mode
3978  *
3979  * \retval              0 on success, -ev on error.
3980  */
3981 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *obj,
3982                     struct mdt_lock_handle *lh, __u64 ibits,
3983                     enum ldlm_mode mode)
3984 {
3985         int rc;
3986
3987         ENTRY;
3988         mdt_lock_reg_init(lh, mode);
3989         rc = mdt_object_lock_internal(info, obj, mdt_object_fid(obj), lh,
3990                                       &ibits, 0, false);
3991         RETURN(rc);
3992 }
3993
3994 /**
3995  * lock object with LOOKUP and other ibits
3996  *
3997  * it will check whether parent and child are on different MDTs, if so, take
3998  * LOOKUP lock on parent MDT, and lock other ibits on child MDT, otherwise lock
3999  * all ibits on child MDT. Note, parent and child shouldn't be both on remote
4000  * MDTs, in which case specific lock function should be used, and it's in
4001  * rename and migrate only.
4002  *
4003  * \param info          struct mdt_thread_info
4004  * \param parent        parent object
4005  * \param child         child object
4006  * \param lh            lock handle
4007  * \param ibits         MDS inode lock bits
4008  * \param mode          lock mode
4009  *
4010  * \retval              0 on success, -ev on error.
4011  */
4012 int mdt_object_check_lock(struct mdt_thread_info *info,
4013                           struct mdt_object *parent, struct mdt_object *child,
4014                           struct mdt_lock_handle *lh, __u64 ibits,
4015                           enum ldlm_mode mode)
4016 {
4017         int rc;
4018
4019         ENTRY;
4020         /* if LOOKUP ibit is not set, use mdt_object_lock() */
4021         LASSERT(ibits & MDS_INODELOCK_LOOKUP);
4022         /* if only LOOKUP ibit is needed, use mdt_object_lookup_lock() */
4023         LASSERT(ibits != MDS_INODELOCK_LOOKUP);
4024         LASSERT(parent);
4025         /* @parent and @child shouldn't both be on remote MDTs */
4026         LASSERT(!(mdt_object_remote(parent) && mdt_object_remote(child)));
4027
4028         mdt_lock_reg_init(lh, mode);
4029         if (mdt_object_remote(parent) ^ mdt_object_remote(child)) {
4030                 __u64 lookup_ibits = MDS_INODELOCK_LOOKUP;
4031
4032                 rc = mdt_object_lock_internal(info, parent,
4033                                               mdt_object_fid(child), lh,
4034                                               &lookup_ibits, 0, false);
4035                 if (rc)
4036                         RETURN(rc);
4037
4038                 ibits &= ~MDS_INODELOCK_LOOKUP;
4039         }
4040
4041         rc = mdt_object_lock_internal(info, child, mdt_object_fid(child), lh,
4042                                       &ibits, 0, false);
4043         if (rc && !(ibits & MDS_INODELOCK_LOOKUP))
4044                 mdt_object_unlock(info, NULL, lh, 1);
4045
4046         RETURN(rc);
4047 }
4048
4049 /**
4050  * take parent UPDATE lock
4051  *
4052  * if parent is local or mode is LCK_PW, take PDO lock, otherwise take regular
4053  * lock.
4054  *
4055  * \param info  struct mdt_thread_info
4056  * \param obj   parent object
4057  * \param lh    lock handle
4058  * \param lname child name
4059  * \param mode  lock mode
4060  *
4061  * \retval      0 on success, -ev on error.
4062  */
4063 int mdt_parent_lock(struct mdt_thread_info *info, struct mdt_object *obj,
4064                     struct mdt_lock_handle *lh, const struct lu_name *lname,
4065                     enum ldlm_mode mode)
4066 {
4067         int rc;
4068
4069         ENTRY;
4070         LASSERT(obj && lname);
4071         LASSERT(mode == LCK_PW || mode == LCK_PR);
4072         if (mdt_object_remote(obj) && mode == LCK_PR) {
4073                 __u64 ibits = MDS_INODELOCK_UPDATE;
4074
4075                 mdt_lock_reg_init(lh, mode);
4076                 rc = mdt_object_lock_internal(info, obj, mdt_object_fid(obj),
4077                                               lh, &ibits, 0, false);
4078         } else {
4079                 rc = mdt_object_pdo_lock(info, obj, lh, lname, mode, true);
4080         }
4081         RETURN(rc);
4082 }
4083
4084 /**
4085  * lock object with trybits
4086  *
4087  * the trybits contains optional inode lock bits that can be granted. This is
4088  * called by getattr/open to fetch more inode lock bits to client, and is also
4089  * called by dir migration to lock link parent in non-block mode to avoid
4090  * deadlock.
4091  *
4092  * \param info          struct mdt_thread_info
4093  * \param obj           object
4094  * \param lh            lock handle
4095  * \param ibits         MDS inode lock bits
4096  * \param trybits       optional inode lock bits
4097  * \param mode          lock mode
4098  *
4099  * \retval              0 on success, -ev on error.
4100  */
4101 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *obj,
4102                         struct mdt_lock_handle *lh, __u64 *ibits,
4103                         __u64 trybits, enum ldlm_mode mode)
4104 {
4105         bool trylock_only = *ibits == 0;
4106         int rc;
4107
4108         ENTRY;
4109         LASSERT(!(*ibits & trybits));
4110         mdt_lock_reg_init(lh, mode);
4111         rc = mdt_object_lock_internal(info, obj, mdt_object_fid(obj), lh, ibits,
4112                                       trybits, false);
4113         if (rc && trylock_only) { /* clear error for try ibits lock only */
4114                 LASSERT(*ibits == 0);
4115                 rc = 0;
4116         }
4117         RETURN(rc);
4118 }
4119
4120 /*
4121  * Helper function to take \a obj LOOKUP lock.
4122  *
4123  * Both \a pobj and \a obj may be located on remote MDTs.
4124  */
4125 int mdt_object_lookup_lock(struct mdt_thread_info *info,
4126                            struct mdt_object *pobj, struct mdt_object *obj,
4127                            struct mdt_lock_handle *lh, enum ldlm_mode mode)
4128 {
4129         __u64 ibits = MDS_INODELOCK_LOOKUP;
4130         int rc;
4131
4132         ENTRY;
4133         /* if @parent is NULL, it's on local MDT, and @child is remote,
4134          * this is case in getattr/unlink/open by name.
4135          */
4136         LASSERT(ergo(!pobj, mdt_object_remote(obj)));
4137         mdt_lock_reg_init(lh, mode);
4138         rc = mdt_object_lock_internal(info, pobj, mdt_object_fid(obj), lh,
4139                                       &ibits, 0, false);
4140         RETURN(rc);
4141 }
4142
4143 /**
4144  * Save a lock within request object.
4145  *
4146  * Keep the lock referenced until whether client ACK or transaction
4147  * commit happens or release the lock immediately depending on input
4148  * parameters. If COS is ON, a write lock is converted to COS lock
4149  * before saving.
4150  *
4151  * \param info thead info object
4152  * \param h lock handle
4153  * \param mode lock mode
4154  * \param decref force immediate lock releasing
4155  */
4156 static void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
4157                           enum ldlm_mode mode, int decref)
4158 {
4159         struct tgt_session_info *tsi = info->mti_env->le_ses ?
4160                                        tgt_ses_info(info->mti_env) : NULL;
4161
4162         ENTRY;
4163
4164         if (lustre_handle_is_used(h)) {
4165                 bool has_trans = tsi && tsi->tsi_has_trans;
4166
4167                 if (decref || !has_trans || !(mode & (LCK_PW | LCK_EX))) {
4168                         mdt_fid_unlock(h, mode);
4169                 } else {
4170                         struct mdt_device *mdt = info->mti_mdt;
4171                         struct ldlm_lock *lock = ldlm_handle2lock(h);
4172                         struct ptlrpc_request *req = mdt_info_req(info);
4173                         bool no_ack = false;
4174
4175                         LASSERTF(lock != NULL, "no lock for cookie %#llx\n",
4176                                  h->cookie);
4177
4178                         /* there is no request if mdt_object_unlock() is called
4179                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
4180                         if (likely(req != NULL)) {
4181                                 LDLM_DEBUG(lock, "save lock request %p reply "
4182                                         "state %p transno %lld", req,
4183                                         req->rq_reply_state, req->rq_transno);
4184                                 if (mdt_cos_is_enabled(mdt)) {
4185                                         mode = LCK_COS;
4186                                         no_ack = true;
4187                                         ldlm_lock_mode_downgrade(lock, mode);
4188                                 } else if (mdt_slc_is_enabled(mdt)) {
4189                                         no_ack = true;
4190                                         if (mode != LCK_TXN) {
4191                                                 mode = LCK_TXN;
4192                                                 ldlm_lock_mode_downgrade(lock,
4193                                                                          mode);
4194                                         }
4195                                 }
4196                                 if (req->rq_export->exp_disconnected)
4197                                         mdt_fid_unlock(h, mode);
4198                                 else
4199                                         ptlrpc_save_lock(req, h, mode, no_ack);
4200                         } else {
4201                                 mdt_fid_unlock(h, mode);
4202                         }
4203
4204                         if (mdt_is_lock_sync(lock)) {
4205                                 CDEBUG(D_HA, "sync_lock, do async commit\n");
4206                                 mdt_device_commit_async(info->mti_env, mdt);
4207                         }
4208                         LDLM_LOCK_PUT(lock);
4209                 }
4210                 h->cookie = 0ull;
4211         }
4212
4213         EXIT;
4214 }
4215
4216 /**
4217  * Save cross-MDT lock in uncommitted_slc_locks
4218  *
4219  * Keep the lock referenced until transaction commit happens or release the lock
4220  * immediately depending on input parameters.
4221  *
4222  * \param info thead info object
4223  * \param h lock handle
4224  * \param mode lock mode
4225  * \param decref force immediate lock releasing
4226  */
4227 static void mdt_save_remote_lock(struct mdt_thread_info *info,
4228                                  struct mdt_object *o, struct lustre_handle *h,
4229                                  enum ldlm_mode mode, int decref)
4230 {
4231         ENTRY;
4232
4233         if (lustre_handle_is_used(h)) {
4234                 struct ldlm_lock *lock = ldlm_handle2lock(h);
4235                 struct ptlrpc_request *req = mdt_info_req(info);
4236
4237                 if (o != NULL &&
4238                     (lock->l_policy_data.l_inodebits.bits &
4239                      (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)))
4240                         mo_invalidate(info->mti_env, mdt_object_child(o));
4241
4242                 if (decref || !req || !(mode & (LCK_PW | LCK_EX)) ||
4243                     !tgt_ses_info(info->mti_env)->tsi_has_trans) {
4244                         ldlm_lock_decref_and_cancel(h, mode);
4245                         LDLM_LOCK_PUT(lock);
4246                 } else {
4247                         tgt_save_slc_lock(&info->mti_mdt->mdt_lut, lock,
4248                                           req->rq_transno);
4249                         ldlm_lock_decref(h, mode);
4250                 }
4251                 h->cookie = 0ull;
4252         }
4253
4254         EXIT;
4255 }
4256
4257 /**
4258  * Unlock mdt object.
4259  *
4260  * Immeditely release the regular lock and the PDO lock or save the
4261  * lock in request and keep them referenced until client ACK or
4262  * transaction commit.
4263  *
4264  * \param info thread info object
4265  * \param o mdt object
4266  * \param lh mdt lock handle referencing regular and PDO locks
4267  * \param decref force immediate lock releasing
4268  *
4269  * XXX o is not used and may be NULL, see hsm_cdt_request_completed().
4270  */
4271 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
4272                        struct mdt_lock_handle *lh, int decref)
4273 {
4274         ENTRY;
4275
4276         if (lh->mlh_pdo_remote)
4277                 mdt_save_remote_lock(info, o, &lh->mlh_pdo_lh,
4278                                      lh->mlh_pdo_mode, decref);
4279         else
4280                 mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
4281         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
4282         mdt_save_remote_lock(info, o, &lh->mlh_rreg_lh, lh->mlh_rreg_mode,
4283                              decref);
4284
4285         EXIT;
4286 }
4287
4288 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
4289                                         const struct lu_fid *f,
4290                                         struct mdt_lock_handle *lh,
4291                                         __u64 ibits, enum ldlm_mode mode)
4292 {
4293         struct mdt_object *o;
4294
4295         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
4296         if (!IS_ERR(o)) {
4297                 int rc;
4298
4299                 rc = mdt_object_lock(info, o, lh, ibits, mode);
4300                 if (rc != 0) {
4301                         mdt_object_put(info->mti_env, o);
4302                         o = ERR_PTR(rc);
4303                 }
4304         }
4305         return o;
4306 }
4307
4308 void mdt_object_unlock_put(struct mdt_thread_info * info,
4309                            struct mdt_object *o,
4310                            struct mdt_lock_handle *lh,
4311                            int decref)
4312 {
4313         mdt_object_unlock(info, o, lh, decref);
4314         mdt_object_put(info->mti_env, o);
4315 }
4316
4317 /*
4318  * Generic code handling requests that have struct mdt_body passed in:
4319  *
4320  *  - extract mdt_body from request and save it in @info, if present;
4321  *
4322  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
4323  *  @info;
4324  *
4325  *  - if HAS_BODY flag is set for this request type check whether object
4326  *  actually exists on storage (lu_object_exists()).
4327  *
4328  */
4329 static int mdt_body_unpack(struct mdt_thread_info *info,
4330                            enum tgt_handler_flags flags)
4331 {
4332         const struct mdt_body    *body;
4333         struct mdt_object        *obj;
4334         const struct lu_env      *env;
4335         struct req_capsule       *pill;
4336         int                       rc;
4337         ENTRY;
4338
4339         env = info->mti_env;
4340         pill = info->mti_pill;
4341
4342         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
4343         if (body == NULL)
4344                 RETURN(-EFAULT);
4345
4346         if (!(body->mbo_valid & OBD_MD_FLID))
4347                 RETURN(0);
4348
4349         if (!fid_is_sane(&body->mbo_fid1)) {
4350                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
4351                 RETURN(-EINVAL);
4352         }
4353
4354         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
4355         if (!IS_ERR(obj)) {
4356                 if ((flags & HAS_BODY) && !mdt_object_exists(obj)) {
4357                         mdt_object_put(env, obj);
4358                         rc = -ENOENT;
4359                 } else {
4360                         info->mti_object = obj;
4361                         rc = 0;
4362                 }
4363         } else
4364                 rc = PTR_ERR(obj);
4365
4366         RETURN(rc);
4367 }
4368
4369 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info,
4370                                    enum tgt_handler_flags flags)
4371 {
4372         struct req_capsule *pill = info->mti_pill;
4373         int rc;
4374
4375         ENTRY;
4376
4377         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
4378                 rc = mdt_body_unpack(info, flags);
4379         else
4380                 rc = 0;
4381
4382         if (rc == 0 && (flags & HAS_REPLY)) {
4383                 /* Pack reply. */
4384                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
4385                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
4386                                              req_capsule_ptlreq(pill) ?
4387                                              DEF_REP_MD_SIZE : MAX_MD_SIZE_OLD);
4388
4389                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
4390                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
4391                                              RCL_SERVER, 0);
4392
4393                 /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
4394                  * by default. If the target object has more ACL entries, then
4395                  * enlarge the buffer when necessary. */
4396                 if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
4397                         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
4398                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
4399
4400                 mdt_preset_secctx_size(info);
4401                 mdt_preset_encctx_size(info);
4402
4403                 rc = req_capsule_server_pack(pill);
4404                 if (rc)
4405                         CWARN("%s: cannot pack response: rc = %d\n",
4406                                       mdt_obd_name(info->mti_mdt), rc);
4407         }
4408         RETURN(rc);
4409 }
4410
4411 void mdt_thread_info_reset(struct mdt_thread_info *info)
4412 {
4413         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
4414         info->mti_body = NULL;
4415         info->mti_dlm_req = NULL;
4416         info->mti_cross_ref = 0;
4417         info->mti_opdata = 0;
4418         info->mti_big_lmm_used = 0;
4419         info->mti_big_acl_used = 0;
4420         info->mti_som_strict = 0;
4421
4422         info->mti_spec.no_create = 0;
4423         info->mti_spec.sp_rm_entry = 0;
4424         info->mti_spec.sp_permitted = 0;
4425
4426         info->mti_spec.u.sp_ea.eadata = NULL;
4427         info->mti_spec.u.sp_ea.eadatalen = 0;
4428
4429         if (info->mti_batch_env && info->mti_object != NULL) {
4430                 mdt_object_put(info->mti_env, info->mti_object);
4431                 info->mti_object = NULL;
4432         }
4433 }
4434
4435 /*
4436  * Initialize fields of struct mdt_thread_info. Other fields are left in
4437  * uninitialized state, because it's too expensive to zero out whole
4438  * mdt_thread_info (> 1K) on each request arrival.
4439  */
4440 void mdt_thread_info_init(struct ptlrpc_request *req,
4441                           struct mdt_thread_info *info)
4442 {
4443         info->mti_pill = &req->rq_pill;
4444
4445         /* mdt device: it can be NULL while CONNECT */
4446         if (req->rq_export) {
4447                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
4448                 info->mti_exp = req->rq_export;
4449         } else
4450                 info->mti_mdt = NULL;
4451         info->mti_env = req->rq_svc_thread->t_env;
4452         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
4453         info->mti_big_buf = LU_BUF_NULL;
4454         info->mti_batch_env = 0;
4455         info->mti_object = NULL;
4456
4457         mdt_thread_info_reset(info);
4458 }
4459
4460 void mdt_thread_info_fini(struct mdt_thread_info *info)
4461 {
4462         int i;
4463
4464         if (info->mti_object != NULL) {
4465                 mdt_object_put(info->mti_env, info->mti_object);
4466                 info->mti_object = NULL;
4467         }
4468
4469         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
4470                 mdt_lock_handle_assert(&info->mti_lh[i]);
4471         info->mti_env = NULL;
4472         info->mti_pill = NULL;
4473         info->mti_exp = NULL;
4474         info->mti_mdt = NULL;
4475
4476         if (unlikely(info->mti_big_buf.lb_buf != NULL))
4477                 lu_buf_free(&info->mti_big_buf);
4478 }
4479
4480 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
4481 {
4482         struct mdt_thread_info  *mti;
4483
4484         mti = mdt_th_info(tsi->tsi_env);
4485         LASSERT(mti != NULL);
4486
4487         mdt_thread_info_init(tgt_ses_req(tsi), mti);
4488         if (tsi->tsi_corpus != NULL) {
4489                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
4490                 lu_object_get(tsi->tsi_corpus);
4491         }
4492         mti->mti_body = tsi->tsi_mdt_body;
4493         mti->mti_dlm_req = tsi->tsi_dlm_req;
4494
4495         return mti;
4496 }
4497
4498 static int mdt_tgt_connect(struct tgt_session_info *tsi)
4499 {
4500         if (CFS_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
4501             cfs_fail_val ==
4502             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id)
4503                 schedule_timeout_uninterruptible(cfs_time_seconds(3));
4504
4505         return tgt_connect(tsi);
4506 }
4507
4508 static int mdt_intent_glimpse(enum ldlm_intent_flags it_opc,
4509                               struct mdt_thread_info *info,
4510                               struct ldlm_lock **lockp, __u64 flags)
4511 {
4512         return mdt_glimpse_enqueue(info, info->mti_mdt->mdt_namespace,
4513                                    lockp, flags);
4514 }
4515 static int mdt_intent_brw(enum ldlm_intent_flags it_opc,
4516                           struct mdt_thread_info *info,
4517                           struct ldlm_lock **lockp, __u64 flags)
4518 {
4519         return mdt_brw_enqueue(info, info->mti_mdt->mdt_namespace,
4520                                lockp, flags);
4521 }
4522
4523 int mdt_intent_lock_replace(struct mdt_thread_info *info,
4524                             struct ldlm_lock **lockp,
4525                             struct mdt_lock_handle *lh,
4526                             __u64 flags, int result)
4527 {
4528         struct ptlrpc_request  *req = mdt_info_req(info);
4529         struct ldlm_lock       *lock = *lockp;
4530         struct ldlm_lock       *new_lock;
4531
4532         /* If possible resent found a lock, @lh is set to its handle */
4533         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
4534
4535         if (new_lock == NULL) {
4536                 if (flags & LDLM_FL_INTENT_ONLY) {
4537                         result = 0;
4538                 } else if (flags & LDLM_FL_RESENT) {
4539                         /* Lock is pinned by ldlm_handle_enqueue0() as it is a
4540                          * resend case, however, it could be already destroyed
4541                          * due to client eviction or a raced cancel RPC.
4542                          */
4543                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx\n",
4544                                           lh->mlh_reg_lh.cookie);
4545                         result = -ESTALE;
4546                 } else {
4547                         CERROR("%s: Invalid lockh=%#llx flags=%#llx fid1="DFID" fid2="DFID": rc = %d\n",
4548                                mdt_obd_name(info->mti_mdt),
4549                                lh->mlh_reg_lh.cookie, flags,
4550                                PFID(&info->mti_tmp_fid1),
4551                                PFID(&info->mti_tmp_fid2), result);
4552                         result = -ESTALE;
4553                 }
4554                 lh->mlh_reg_lh.cookie = 0;
4555                 RETURN(result);
4556         }
4557
4558         /*
4559          * If we've already given this lock to a client once, then we should
4560          * have no readers or writers.  Otherwise, we should have one reader
4561          * _or_ writer ref (which will be zeroed below) before returning the
4562          * lock to a client.
4563          */
4564         if (new_lock->l_export == req->rq_export) {
4565                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
4566         } else {
4567                 LASSERT(new_lock->l_export == NULL);
4568                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
4569         }
4570
4571         *lockp = new_lock;
4572
4573         if (new_lock->l_export == req->rq_export) {
4574                 /*
4575                  * Already gave this to the client, which means that we
4576                  * reconstructed a reply.
4577                  */
4578                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
4579                         MSG_RESENT);
4580
4581                 LDLM_LOCK_RELEASE(new_lock);
4582                 lh->mlh_reg_lh.cookie = 0;
4583                 RETURN(ELDLM_LOCK_REPLACED);
4584         }
4585
4586         /*
4587          * Fixup the lock to be given to the client.
4588          */
4589         lock_res_and_lock(new_lock);
4590         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
4591          * possible blocking AST. */
4592         while (new_lock->l_readers > 0) {
4593                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
4594                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
4595                 new_lock->l_readers--;
4596         }
4597         while (new_lock->l_writers > 0) {
4598                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
4599                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
4600                 new_lock->l_writers--;
4601         }
4602
4603         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
4604         new_lock->l_blocking_ast = lock->l_blocking_ast;
4605         new_lock->l_completion_ast = lock->l_completion_ast;
4606         if (ldlm_has_dom(new_lock))
4607                 new_lock->l_glimpse_ast = ldlm_server_glimpse_ast;
4608         new_lock->l_remote_handle = lock->l_remote_handle;
4609         new_lock->l_flags &= ~LDLM_FL_LOCAL;
4610
4611         unlock_res_and_lock(new_lock);
4612
4613         cfs_hash_add(new_lock->l_export->exp_lock_hash,
4614                      &new_lock->l_remote_handle,
4615                      &new_lock->l_exp_hash);
4616
4617         LDLM_LOCK_RELEASE(new_lock);
4618         lh->mlh_reg_lh.cookie = 0;
4619
4620         RETURN(ELDLM_LOCK_REPLACED);
4621 }
4622
4623 void mdt_intent_fixup_resent(struct mdt_thread_info *info,
4624                              struct ldlm_lock *new_lock,
4625                              struct mdt_lock_handle *lh, __u64 flags)
4626 {
4627         struct ptlrpc_request  *req = mdt_info_req(info);
4628         struct ldlm_request    *dlmreq;
4629
4630         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
4631                 return;
4632
4633         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
4634
4635         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
4636          * lock was found by ldlm_handle_enqueue(); if so @lh must be
4637          * initialized. */
4638         if (flags & LDLM_FL_RESENT) {
4639                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
4640                 lh->mlh_reg_mode = new_lock->l_granted_mode;
4641
4642                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
4643                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie %#llx",
4644                           lh->mlh_reg_lh.cookie);
4645                 return;
4646         }
4647
4648         /*
4649          * If the xid matches, then we know this is a resent request, and allow
4650          * it. (It's probably an OPEN, for which we don't send a lock.
4651          */
4652         if (req_can_reconstruct(req, NULL) != 0)
4653                 return;
4654
4655         /*
4656          * This remote handle isn't enqueued, so we never received or processed
4657          * this request.  Clear MSG_RESENT, because it can be handled like any
4658          * normal request now.
4659          */
4660         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
4661
4662         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle %#llx",
4663                   dlmreq->lock_handle[0].cookie);
4664 }
4665
4666 static int mdt_intent_getxattr(enum ldlm_intent_flags it_opc,
4667                                struct mdt_thread_info *info,
4668                                struct ldlm_lock **lockp,
4669                                __u64 flags)
4670 {
4671         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4672         struct ldlm_reply      *ldlm_rep = NULL;
4673         int rc;
4674         ENTRY;
4675
4676         /*
4677          * Initialize lhc->mlh_reg_lh either from a previously granted lock
4678          * (for the resend case) or a new lock. Below we will use it to
4679          * replace the original lock.
4680          */
4681         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4682         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
4683                 rc = mdt_object_lock(info, info->mti_object, lhc,
4684                                      MDS_INODELOCK_XATTR, (*lockp)->l_req_mode);
4685                 if (rc)
4686                         return rc;
4687         }
4688
4689         rc = mdt_getxattr(info);
4690
4691         if (mdt_info_req(info)->rq_repmsg != NULL)
4692                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4693
4694         if (ldlm_rep == NULL ||
4695             CFS_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
4696                 mdt_object_unlock(info,  info->mti_object, lhc, 1);
4697                 if (is_serious(rc))
4698                         RETURN(rc);
4699                 else
4700                         RETURN(err_serious(-EFAULT));
4701         }
4702
4703         ldlm_rep->lock_policy_res2 = clear_serious(rc);
4704
4705         /* This is left for interop instead of adding a new interop flag.
4706          * LU-7433 */
4707 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(3, 0, 0, 0)
4708         if (ldlm_rep->lock_policy_res2) {
4709                 mdt_object_unlock(info, info->mti_object, lhc, 1);
4710                 RETURN(ELDLM_LOCK_ABORTED);
4711         }
4712 #endif
4713
4714         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4715         RETURN(rc);
4716 }
4717
4718 static int mdt_intent_getattr(enum ldlm_intent_flags it_opc,
4719                               struct mdt_thread_info *info,
4720                               struct ldlm_lock **lockp,
4721                               __u64 flags)
4722 {
4723         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4724         __u64                   child_bits;
4725         struct ldlm_reply      *ldlm_rep;
4726         struct mdt_body        *reqbody;
4727         struct mdt_body        *repbody;
4728         int                     rc, rc2;
4729         ENTRY;
4730
4731         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
4732         LASSERT(reqbody);
4733
4734         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
4735         LASSERT(repbody);
4736
4737         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
4738         repbody->mbo_eadatasize = 0;
4739         repbody->mbo_aclsize = 0;
4740
4741         switch (it_opc) {
4742         case IT_LOOKUP:
4743                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
4744                 break;
4745         case IT_GETATTR:
4746                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
4747                              MDS_INODELOCK_PERM;
4748                 break;
4749         default:
4750                 CERROR("%s: unsupported intent %#x\n",
4751                        mdt_obd_name(info->mti_mdt), (unsigned int)it_opc);
4752                 GOTO(out_shrink, rc = -EINVAL);
4753         }
4754
4755         rc = mdt_init_ucred(info, reqbody);
4756         if (rc)
4757                 GOTO(out_shrink, rc);
4758
4759         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4760         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
4761
4762         /* Get lock from request for possible resent case. */
4763         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4764
4765         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
4766         ldlm_rep->lock_policy_res2 = clear_serious(rc);
4767
4768         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG) &&
4769             ldlm_rep->lock_policy_res2 != -ENOKEY)
4770                 ldlm_rep->lock_policy_res2 = 0;
4771         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
4772             ldlm_rep->lock_policy_res2) {
4773                 lhc->mlh_reg_lh.cookie = 0ull;
4774                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
4775         }
4776
4777         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4778         EXIT;
4779 out_ucred:
4780         mdt_exit_ucred(info);
4781 out_shrink:
4782         mdt_client_compatibility(info);
4783         rc2 = mdt_fix_reply(info);
4784         if (rc == 0)
4785                 rc = rc2;
4786         return rc;
4787 }
4788
4789 static int mdt_intent_layout(enum ldlm_intent_flags it_opc,
4790                              struct mdt_thread_info *info,
4791                              struct ldlm_lock **lockp,
4792                              __u64 flags)
4793 {
4794         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4795         struct md_layout_change layout = { .mlc_opc = MD_LAYOUT_NOP };
4796         struct layout_intent *intent;
4797         struct ldlm_reply *ldlm_rep;
4798         struct lu_fid *fid = &info->mti_tmp_fid2;
4799         struct mdt_object *obj = NULL;
4800         int layout_size = 0;
4801         struct lu_buf *buf = &layout.mlc_buf;
4802         int rc = 0;
4803
4804         ENTRY;
4805
4806         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
4807
4808         intent = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
4809         if (intent == NULL)
4810                 RETURN(-EPROTO);
4811
4812         CDEBUG(D_INFO, DFID "got layout change request from client: "
4813                "opc:%u flags:%#x extent "DEXT"\n",
4814                PFID(fid), intent->lai_opc, intent->lai_flags,
4815                PEXT(&intent->lai_extent));
4816
4817         switch (intent->lai_opc) {
4818         case LAYOUT_INTENT_TRUNC:
4819         case LAYOUT_INTENT_WRITE:
4820         case LAYOUT_INTENT_PCCRO_SET:
4821         case LAYOUT_INTENT_PCCRO_CLEAR:
4822                 layout.mlc_opc = MD_LAYOUT_WRITE;
4823                 layout.mlc_intent = intent;
4824                 break;
4825         case LAYOUT_INTENT_ACCESS:
4826                 break;
4827         case LAYOUT_INTENT_READ:
4828         case LAYOUT_INTENT_GLIMPSE:
4829         case LAYOUT_INTENT_RELEASE:
4830         case LAYOUT_INTENT_RESTORE:
4831                 CERROR("%s: Unsupported layout intent opc %d\n",
4832                        mdt_obd_name(info->mti_mdt), intent->lai_opc);
4833                 RETURN(-ENOTSUPP);
4834         default:
4835                 CERROR("%s: Unknown layout intent opc %d\n",
4836                        mdt_obd_name(info->mti_mdt), intent->lai_opc);
4837                 RETURN(-EINVAL);
4838         }
4839
4840         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
4841         if (IS_ERR(obj))
4842                 RETURN(PTR_ERR(obj));
4843
4844         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
4845                 /* if layout is going to be changed don't use the current EA
4846                  * size but the maximum one. That buffer will be shrinked
4847                  * to the actual size in req_capsule_shrink() before reply.
4848                  */
4849                 if (layout.mlc_opc == MD_LAYOUT_WRITE) {
4850                         layout_size = info->mti_mdt->mdt_max_mdsize;
4851                 } else {
4852                         layout_size = mdt_attr_get_eabuf_size(info, obj);
4853                         if (layout_size < 0)
4854                                 GOTO(out, rc = layout_size);
4855
4856                         if (layout_size > info->mti_mdt->mdt_max_mdsize)
4857                                 info->mti_mdt->mdt_max_mdsize = layout_size;
4858                 }
4859                 CDEBUG(D_INFO, "%s: layout_size %d\n",
4860                        mdt_obd_name(info->mti_mdt), layout_size);
4861         }
4862
4863         /*
4864          * set reply buffer size, so that ldlm_handle_enqueue0()->
4865          * ldlm_lvbo_fill() will fill the reply buffer with lovea.
4866          */
4867         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
4868                              layout_size);
4869         rc = req_capsule_server_pack(info->mti_pill);
4870         if (rc)
4871                 GOTO(out, rc);
4872
4873         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4874         if (!ldlm_rep)
4875                 GOTO(out, rc = -EPROTO);
4876
4877         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
4878
4879         /* take lock in ldlm_lock_enqueue() for LAYOUT_INTENT_ACCESS */
4880         if (layout.mlc_opc == MD_LAYOUT_NOP)
4881                 GOTO(out, rc = 0);
4882
4883         rc = mdt_check_resent(info, mdt_reconstruct_generic, lhc);
4884         if (rc < 0)
4885                 GOTO(out, rc);
4886         if (rc == 1) {
4887                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
4888                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
4889                 GOTO(out, rc);
4890         }
4891
4892         buf->lb_buf = NULL;
4893         buf->lb_len = 0;
4894         if (unlikely(req_is_replay(mdt_info_req(info)))) {
4895                 buf->lb_buf = req_capsule_client_get(info->mti_pill,
4896                                                      &RMF_EADATA);
4897                 buf->lb_len = req_capsule_get_size(info->mti_pill,
4898                                                      &RMF_EADATA, RCL_CLIENT);
4899                 /*
4900                  * If it's a replay of layout write intent RPC, the client has
4901                  * saved the extended lovea when it get reply then.
4902                  */
4903                 if (buf->lb_len > 0)
4904                         mdt_fix_lov_magic(info, buf->lb_buf);
4905         }
4906
4907         /* Get lock from request for possible resent case. */
4908         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4909         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
4910
4911         /*
4912          * Instantiate some layout components, if @buf contains lovea, then it's
4913          * a replay of the layout intent write RPC.
4914          */
4915         rc = mdt_layout_change(info, obj, lhc, &layout);
4916         ldlm_rep->lock_policy_res2 = clear_serious(rc);
4917
4918         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
4919                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4920                 if (rc == ELDLM_LOCK_REPLACED &&
4921                     (*lockp)->l_granted_mode == LCK_EX)
4922                         ldlm_lock_mode_downgrade(*lockp, LCK_CR);
4923         }
4924
4925         EXIT;
4926 out:
4927         mdt_object_put(info->mti_env, obj);
4928         return rc;
4929 }
4930
4931 static int mdt_intent_open(enum ldlm_intent_flags it_opc,
4932                            struct mdt_thread_info *info,
4933                            struct ldlm_lock **lockp,
4934                            __u64 flags)
4935 {
4936         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4937         struct ldlm_reply      *rep = NULL;
4938         long                    opc;
4939         int                     rc;
4940         struct ptlrpc_request  *req = mdt_info_req(info);
4941
4942         static const struct req_format *intent_fmts[REINT_MAX] = {
4943                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
4944                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
4945         };
4946
4947         ENTRY;
4948
4949         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
4950         if (opc < 0)
4951                 RETURN(opc);
4952
4953         /* Get lock from request for possible resent case. */
4954         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4955
4956         rc = mdt_reint_internal(info, lhc, opc);
4957
4958         if (rc < 0 && lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
4959                 DEBUG_REQ(D_ERROR, req, "Replay open failed with %d", rc);
4960
4961         /* Check whether the reply has been packed successfully. */
4962         if (mdt_info_req(info)->rq_repmsg != NULL)
4963                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4964         if (rep == NULL) {
4965                 if (is_serious(rc))
4966                         RETURN(rc);
4967                 else
4968                         RETURN(err_serious(-EFAULT));
4969         }
4970
4971         /* MDC expects this in any case */
4972         if (rc != 0)
4973                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
4974
4975         /* the open lock or the lock for cross-ref object should be
4976          * returned to the client */
4977         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
4978             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
4979                 rep->lock_policy_res2 = 0;
4980                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4981                 RETURN(rc);
4982         }
4983
4984         rep->lock_policy_res2 = clear_serious(rc);
4985
4986         if (rep->lock_policy_res2 == -ENOENT &&
4987             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
4988             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
4989                 rep->lock_policy_res2 = 0;
4990
4991         lhc->mlh_reg_lh.cookie = 0ull;
4992         if (rc == -ENOTCONN || rc == -ENODEV ||
4993             rc == -EOVERFLOW) { /**< if VBR failure then return error */
4994                 /*
4995                  * If it is the disconnect error (ENODEV & ENOCONN), the error
4996                  * will be returned by rq_status, and client at ptlrpc layer
4997                  * will detect this, then disconnect, reconnect the import
4998                  * immediately, instead of impacting the following the rpc.
4999                  */
5000                 RETURN(rc);
5001         }
5002         /*
5003          * For other cases, the error will be returned by intent, and client
5004          * will retrieve the result from intent.
5005          */
5006         RETURN(ELDLM_LOCK_ABORTED);
5007 }
5008
5009 static int mdt_intent_opc(enum ldlm_intent_flags it_opc,
5010                           struct mdt_thread_info *info,
5011                           struct ldlm_lock **lockp,
5012                           u64 flags /* LDLM_FL_* */)
5013 {
5014         struct req_capsule *pill = info->mti_pill;
5015         struct ptlrpc_request *req = mdt_info_req(info);
5016         const struct req_format *it_format;
5017         int (*it_handler)(enum ldlm_intent_flags,
5018                           struct mdt_thread_info *,
5019                           struct ldlm_lock **,
5020                           u64);
5021         enum tgt_handler_flags it_handler_flags = 0;
5022         struct ldlm_reply *rep;
5023         bool check_mdt_object = false;
5024         int rc;
5025         ENTRY;
5026
5027         switch (it_opc) {
5028         case IT_OPEN:
5029         case IT_OPEN|IT_CREAT:
5030                 /*
5031                  * OCREAT is not a IS_MUTABLE request since the file may
5032                  * already exist. We do the extra check of
5033                  * OBD_CONNECT_RDONLY in mdt_reint_open() when we
5034                  * really need to create the object.
5035                  */
5036                 it_format = &RQF_LDLM_INTENT;
5037                 it_handler = &mdt_intent_open;
5038                 break;
5039         case IT_GETATTR:
5040                 check_mdt_object = true;
5041                 fallthrough;
5042         case IT_LOOKUP:
5043                 it_format = &RQF_LDLM_INTENT_GETATTR;
5044                 it_handler = &mdt_intent_getattr;
5045                 it_handler_flags = HAS_REPLY;
5046                 break;
5047         case IT_GETXATTR:
5048                 check_mdt_object = true;
5049                 it_format = &RQF_LDLM_INTENT_GETXATTR;
5050                 it_handler = &mdt_intent_getxattr;
5051                 it_handler_flags = HAS_BODY;
5052                 break;
5053         case IT_LAYOUT:
5054                 it_format = &RQF_LDLM_INTENT_LAYOUT;
5055                 it_handler = &mdt_intent_layout;
5056                 break;
5057         case IT_GLIMPSE:
5058                 it_format = &RQF_LDLM_INTENT;
5059                 it_handler = &mdt_intent_glimpse;
5060                 break;
5061         case IT_BRW:
5062                 it_format = &RQF_LDLM_INTENT;
5063                 it_handler = &mdt_intent_brw;
5064                 break;
5065         case IT_QUOTA_DQACQ:
5066         case IT_QUOTA_CONN: {
5067                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
5068
5069                 if (qmt == NULL)
5070                         RETURN(-EOPNOTSUPP);
5071
5072                 if (mdt_rdonly(req->rq_export))
5073                         RETURN(-EROFS);
5074
5075                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
5076                 /* pass the request to quota master */
5077                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
5078                                                  mdt_info_req(info), lockp,
5079                                                  flags);
5080                 RETURN(rc);
5081         }
5082         default:
5083                 CERROR("%s: unknown intent code %#x\n",
5084                        mdt_obd_name(info->mti_mdt), it_opc);
5085                 RETURN(-EPROTO);
5086         }
5087
5088         if (!info->mti_batch_env)
5089                 req_capsule_extend(pill, it_format);
5090
5091         rc = mdt_unpack_req_pack_rep(info, it_handler_flags);
5092         if (rc < 0)
5093                 RETURN(rc);
5094
5095         if (unlikely(info->mti_object == NULL && check_mdt_object))
5096                 RETURN(-EPROTO);
5097
5098         if (it_handler_flags & IS_MUTABLE && mdt_rdonly(req->rq_export))
5099                 RETURN(-EROFS);
5100
5101         CFS_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
5102
5103         /* execute policy */
5104         rc = (*it_handler)(it_opc, info, lockp, flags);
5105
5106         /* Check whether the reply has been packed successfully. */
5107         if (info->mti_batch_env || req->rq_repmsg != NULL) {
5108                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
5109                 rep->lock_policy_res2 =
5110                         ptlrpc_status_hton(rep->lock_policy_res2);
5111         }
5112
5113         RETURN(rc);
5114 }
5115
5116 static void mdt_ptlrpc_stats_update(struct ptlrpc_request *req,
5117                                     enum ldlm_intent_flags it_opc)
5118 {
5119         struct lprocfs_stats *srv_stats = ptlrpc_req2svc(req)->srv_stats;
5120
5121         /* update stats when IT code is known */
5122         if (srv_stats != NULL)
5123                 lprocfs_counter_incr(srv_stats,
5124                                 PTLRPC_LAST_CNTR + (it_opc == IT_GLIMPSE ?
5125                                 LDLM_GLIMPSE_ENQUEUE : LDLM_IBITS_ENQUEUE));
5126 }
5127
5128 static int mdt_intent_policy(const struct lu_env *env,
5129                              struct ldlm_namespace *ns,
5130                              struct ldlm_lock **lockp,
5131                              void *req_cookie,
5132                              enum ldlm_mode mode,
5133                              __u64 flags, void *data)
5134 {
5135         struct tgt_session_info *tsi;
5136         struct mdt_thread_info  *info;
5137         struct ptlrpc_request   *req  =  req_cookie;
5138         struct ldlm_intent      *it;
5139         struct req_capsule      *pill;
5140         const struct ldlm_lock_desc *ldesc;
5141         int rc;
5142
5143         ENTRY;
5144
5145         LASSERT(req != NULL);
5146
5147         tsi = tgt_ses_info(env);
5148
5149         info = mdt_th_info(env);
5150         LASSERT(info != NULL);
5151
5152         /* Check whether it is a sub request processing in a batch request */
5153         if (info->mti_batch_env) {
5154                 pill = info->mti_pill;
5155                 LASSERT(pill == &info->mti_sub_pill);
5156         } else {
5157                 info = tsi2mdt_info(tsi);
5158                 pill = info->mti_pill;
5159         }
5160
5161         LASSERT(pill->rc_req == req);
5162         ldesc = &info->mti_dlm_req->lock_desc;
5163
5164         if (info->mti_batch_env ||
5165             req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
5166                 /*
5167                  * For batch processing environment, the request format has
5168                  * already been set.
5169                  */
5170                 if (!info->mti_batch_env)
5171                         req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
5172
5173                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
5174                 if (it != NULL) {
5175                         mdt_ptlrpc_stats_update(req, it->opc);
5176                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
5177                         if (rc == 0)
5178                                 rc = ELDLM_OK;
5179
5180                         /* Lock without inodebits makes no sense and will oops
5181                          * later in ldlm. Let's check it now to see if we have
5182                          * ibits corrupted somewhere in mdt_intent_opc().
5183                          * The case for client miss to set ibits has been
5184                          * processed by others. */
5185                         LASSERT(ergo(ldesc->l_resource.lr_type == LDLM_IBITS,
5186                                 ldesc->l_policy_data.l_inodebits.bits != 0));
5187                 } else {
5188                         rc = err_serious(-EFAULT);
5189                 }
5190         } else if (ldesc->l_resource.lr_type == LDLM_IBITS &&
5191                    ldesc->l_policy_data.l_inodebits.bits == MDS_INODELOCK_DOM) {
5192                 struct ldlm_reply *rep;
5193
5194                 /* No intent was provided but INTENT flag is set along with
5195                  * DOM bit, this is considered as GLIMPSE request.
5196                  * This logic is common for MDT and OST glimpse
5197                  */
5198                 mdt_ptlrpc_stats_update(req, IT_GLIMPSE);
5199                 rc = mdt_glimpse_enqueue(info, ns, lockp, flags);
5200                 /* Check whether the reply has been packed successfully. */
5201                 if (req->rq_repmsg != NULL) {
5202                         rep = req_capsule_server_get(info->mti_pill,
5203                                                      &RMF_DLM_REP);
5204                         rep->lock_policy_res2 =
5205                                 ptlrpc_status_hton(rep->lock_policy_res2);
5206                 }
5207         } else {
5208                 /* No intent was provided */
5209                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
5210                 rc = req_capsule_server_pack(pill);
5211                 if (rc)
5212                         rc = err_serious(rc);
5213         }
5214
5215         if (!info->mti_batch_env)
5216                 mdt_thread_info_fini(info);
5217         RETURN(rc);
5218 }
5219
5220 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
5221 {
5222         struct seq_server_site  *ss = mdt_seq_site(mdt);
5223
5224         if (ss->ss_node_id == 0)
5225                 return;
5226
5227         if (ss->ss_client_seq != NULL) {
5228                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
5229                 ss->ss_client_seq->lcs_exp = NULL;
5230         }
5231
5232         if (ss->ss_server_fld != NULL) {
5233                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
5234                 ss->ss_server_fld->lsf_control_exp = NULL;
5235         }
5236 }
5237
5238 static void mdt_seq_fini_cli(struct mdt_device *mdt)
5239 {
5240         struct seq_server_site *ss = mdt_seq_site(mdt);
5241
5242         if (ss == NULL)
5243                 return;
5244
5245         if (ss->ss_server_seq != NULL)
5246                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
5247 }
5248
5249 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
5250 {
5251         mdt_seq_fini_cli(mdt);
5252         mdt_deregister_seq_exp(mdt);
5253
5254         return seq_site_fini(env, mdt_seq_site(mdt));
5255 }
5256
5257 /**
5258  * It will retrieve its FLDB entries from MDT0, and it only happens
5259  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
5260  * and it needs to refresh FLDB from the MDT0.
5261  **/
5262 static int mdt_register_lwp_callback(void *data)
5263 {
5264         struct lu_env           env;
5265         struct mdt_device       *mdt = data;
5266         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
5267         int                     rc;
5268         ENTRY;
5269
5270         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
5271
5272         rc = lu_env_init(&env, LCT_MD_THREAD);
5273         if (rc < 0) {
5274                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
5275                 RETURN(rc);
5276         }
5277
5278         /* Allocate new sequence now to avoid creating local transaction
5279          * in the normal transaction process */
5280         rc = seq_server_check_and_alloc_super(&env,
5281                                               mdt_seq_site(mdt)->ss_server_seq);
5282         if (rc < 0)
5283                 GOTO(out, rc);
5284
5285         if (fld->lsf_new) {
5286                 rc = fld_update_from_controller(&env, fld);
5287                 if (rc != 0) {
5288                         CERROR("%s: cannot update controller: rc = %d\n",
5289                                mdt_obd_name(mdt), rc);
5290                         GOTO(out, rc);
5291                 }
5292         }
5293 out:
5294         lu_env_fini(&env);
5295         RETURN(rc);
5296 }
5297
5298 static int mdt_register_seq_exp(struct mdt_device *mdt)
5299 {
5300         struct seq_server_site  *ss = mdt_seq_site(mdt);
5301         char                    *lwp_name = NULL;
5302         int                     rc;
5303
5304         if (ss->ss_node_id == 0)
5305                 return 0;
5306
5307         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
5308         if (lwp_name == NULL)
5309                 GOTO(out_free, rc = -ENOMEM);
5310
5311         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
5312         if (rc != 0)
5313                 GOTO(out_free, rc);
5314
5315         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
5316                                       NULL, NULL);
5317         if (rc != 0)
5318                 GOTO(out_free, rc);
5319
5320         rc = lustre_register_lwp_item(lwp_name,
5321                                       &ss->ss_server_fld->lsf_control_exp,
5322                                       mdt_register_lwp_callback, mdt);
5323         if (rc != 0) {
5324                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
5325                 ss->ss_client_seq->lcs_exp = NULL;
5326                 GOTO(out_free, rc);
5327         }
5328 out_free:
5329         if (lwp_name != NULL)
5330                 OBD_FREE(lwp_name, MAX_OBD_NAME);
5331
5332         return rc;
5333 }
5334
5335 /*
5336  * Init client sequence manager which is used by local MDS to talk to sequence
5337  * controller on remote node.
5338  */
5339 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
5340 {
5341         struct seq_server_site *ss = mdt_seq_site(mdt);
5342         char *prefix;
5343         ENTRY;
5344
5345         /* check if this is adding the first MDC and controller is not yet
5346          * initialized. */
5347         OBD_ALLOC_PTR(ss->ss_client_seq);
5348         if (ss->ss_client_seq == NULL)
5349                 RETURN(-ENOMEM);
5350
5351         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
5352         if (prefix == NULL) {
5353                 OBD_FREE_PTR(ss->ss_client_seq);
5354                 ss->ss_client_seq = NULL;
5355                 RETURN(-ENOMEM);
5356         }
5357
5358         /* Note: seq_client_fini will be called in seq_site_fini */
5359         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
5360         seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
5361                         prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
5362                                                             NULL);
5363         OBD_FREE(prefix, MAX_OBD_NAME + 5);
5364
5365         RETURN(seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq));
5366 }
5367
5368 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
5369 {
5370         struct seq_server_site  *ss;
5371         int                     rc;
5372         ENTRY;
5373
5374         ss = mdt_seq_site(mdt);
5375         /* init sequence controller server(MDT0) */
5376         if (ss->ss_node_id == 0) {
5377                 OBD_ALLOC_PTR(ss->ss_control_seq);
5378                 if (ss->ss_control_seq == NULL)
5379                         RETURN(-ENOMEM);
5380
5381                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
5382                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
5383                                      ss);
5384                 if (rc)
5385                         GOTO(out_seq_fini, rc);
5386         }
5387
5388         /* Init normal sequence server */
5389         OBD_ALLOC_PTR(ss->ss_server_seq);
5390         if (ss->ss_server_seq == NULL)
5391                 GOTO(out_seq_fini, rc = -ENOMEM);
5392
5393         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
5394                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
5395         if (rc)
5396                 GOTO(out_seq_fini, rc);
5397
5398         /* init seq client for seq server to talk to seq controller(MDT0) */
5399         rc = mdt_seq_init_cli(env, mdt);
5400         if (rc != 0)
5401                 GOTO(out_seq_fini, rc);
5402
5403         if (ss->ss_node_id != 0)
5404                 /* register controller export through lwp */
5405                 rc = mdt_register_seq_exp(mdt);
5406
5407         EXIT;
5408 out_seq_fini:
5409         if (rc)
5410                 mdt_seq_fini(env, mdt);
5411
5412         return rc;
5413 }
5414
5415 /*
5416  * FLD wrappers
5417  */
5418 static int mdt_fld_fini(const struct lu_env *env,
5419                         struct mdt_device *m)
5420 {
5421         struct seq_server_site *ss = mdt_seq_site(m);
5422         ENTRY;
5423
5424         if (ss && ss->ss_server_fld) {
5425                 fld_server_fini(env, ss->ss_server_fld);
5426                 OBD_FREE_PTR(ss->ss_server_fld);
5427                 ss->ss_server_fld = NULL;
5428         }
5429
5430         RETURN(0);
5431 }
5432
5433 static int mdt_fld_init(const struct lu_env *env,
5434                         const char *uuid,
5435                         struct mdt_device *m)
5436 {
5437         struct seq_server_site *ss;
5438         int rc;
5439         ENTRY;
5440
5441         ss = mdt_seq_site(m);
5442
5443         OBD_ALLOC_PTR(ss->ss_server_fld);
5444         if (ss->ss_server_fld == NULL)
5445                 RETURN(rc = -ENOMEM);
5446
5447         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
5448                              LU_SEQ_RANGE_MDT);
5449         if (rc) {
5450                 OBD_FREE_PTR(ss->ss_server_fld);
5451                 ss->ss_server_fld = NULL;
5452                 RETURN(rc);
5453         }
5454
5455         RETURN(0);
5456 }
5457
5458 static void mdt_stack_pre_fini(const struct lu_env *env,
5459                            struct mdt_device *m, struct lu_device *top)
5460 {
5461         struct lustre_cfg_bufs  *bufs;
5462         struct lustre_cfg       *lcfg;
5463         struct mdt_thread_info  *info;
5464         ENTRY;
5465
5466         LASSERT(top);
5467
5468         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
5469         LASSERT(info != NULL);
5470
5471         bufs = &info->mti_u.bufs;
5472
5473         LASSERT(m->mdt_child_exp);
5474         LASSERT(m->mdt_child_exp->exp_obd);
5475
5476         /* process cleanup, pass mdt obd name to get obd umount flags */
5477         /* XXX: this is needed because all layers are referenced by
5478          * objects (some of them are pinned by osd, for example *
5479          * the proper solution should be a model where object used
5480          * by osd only doesn't have mdt/mdd slices -bzzz */
5481         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
5482         lustre_cfg_bufs_set_string(bufs, 1, NULL);
5483         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5484         if (!lcfg)
5485                 RETURN_EXIT;
5486         lustre_cfg_init(lcfg, LCFG_PRE_CLEANUP, bufs);
5487
5488         top->ld_ops->ldo_process_config(env, top, lcfg);
5489         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5490         EXIT;
5491 }
5492
5493 static void mdt_stack_fini(const struct lu_env *env,
5494                            struct mdt_device *m, struct lu_device *top)
5495 {
5496         struct obd_device       *obd = mdt2obd_dev(m);
5497         struct lustre_cfg_bufs  *bufs;
5498         struct lustre_cfg       *lcfg;
5499         struct mdt_thread_info  *info;
5500         char                     flags[3] = "";
5501         ENTRY;
5502
5503         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
5504         LASSERT(info != NULL);
5505
5506         lu_dev_del_linkage(top->ld_site, top);
5507
5508         lu_site_purge(env, top->ld_site, -1);
5509
5510         bufs = &info->mti_u.bufs;
5511         /* process cleanup, pass mdt obd name to get obd umount flags */
5512         /* another purpose is to let all layers to release their objects */
5513         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
5514         if (obd->obd_force)
5515                 strcat(flags, "F");
5516         if (obd->obd_fail)
5517                 strcat(flags, "A");
5518         lustre_cfg_bufs_set_string(bufs, 1, flags);
5519         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5520         if (!lcfg)
5521                 RETURN_EXIT;
5522         lustre_cfg_init(lcfg, LCFG_CLEANUP, bufs);
5523
5524         LASSERT(top);
5525         top->ld_ops->ldo_process_config(env, top, lcfg);
5526         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5527
5528         lu_site_purge(env, top->ld_site, -1);
5529
5530         m->mdt_child = NULL;
5531         m->mdt_bottom = NULL;
5532
5533         obd_disconnect(m->mdt_child_exp);
5534         m->mdt_child_exp = NULL;
5535
5536         obd_disconnect(m->mdt_bottom_exp);
5537         m->mdt_child_exp = NULL;
5538 }
5539
5540 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
5541                                const char *next, struct obd_export **exp)
5542 {
5543         struct obd_connect_data *data = NULL;
5544         struct obd_device       *obd;
5545         int                      rc;
5546         ENTRY;
5547
5548         OBD_ALLOC_PTR(data);
5549         if (data == NULL)
5550                 GOTO(out, rc = -ENOMEM);
5551
5552         obd = class_name2obd(next);
5553         if (obd == NULL) {
5554                 CERROR("%s: can't locate next device: %s\n",
5555                        mdt_obd_name(m), next);
5556                 GOTO(out, rc = -ENOTCONN);
5557         }
5558
5559         data->ocd_connect_flags = OBD_CONNECT_VERSION;
5560         data->ocd_version = LUSTRE_VERSION_CODE;
5561
5562         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
5563         if (rc) {
5564                 CERROR("%s: cannot connect to next dev %s (%d)\n",
5565                        mdt_obd_name(m), next, rc);
5566                 GOTO(out, rc);
5567         }
5568
5569 out:
5570         if (data)
5571                 OBD_FREE_PTR(data);
5572         RETURN(rc);
5573 }
5574
5575 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
5576                           struct lustre_cfg *cfg)
5577 {
5578         char                   *dev = lustre_cfg_string(cfg, 0);
5579         int                     rc, name_size, uuid_size;
5580         char                   *name, *uuid, *p;
5581         struct lustre_cfg_bufs *bufs;
5582         struct lustre_cfg      *lcfg;
5583         struct obd_device      *obd;
5584         struct lustre_profile  *lprof;
5585         struct lu_site         *site;
5586         ENTRY;
5587
5588         /* in 1.8 we had the only device in the stack - MDS.
5589          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
5590          * in 2.3 OSD is instantiated by obd_mount.c, so we need
5591          * to generate names and setup MDT, MDD. MDT will be using
5592          * generated name to connect to MDD. for MDD the next device
5593          * will be LOD with name taken from so called "profile" which
5594          * is generated by mount_option line
5595          *
5596          * 1.8 MGS generates config. commands like this:
5597          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
5598          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
5599          * 2.0 MGS generates config. commands like this:
5600          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
5601          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
5602          *                    3:lustre-MDT0000-mdtlov  4:f
5603          *
5604          * we generate MDD name from MDT one, just replacing T with D
5605          *
5606          * after all the preparations, the logical equivalent will be
5607          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
5608          *                    3:lustre-MDT0000-mdtlov  4:f
5609          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
5610          *                    3:lustre-MDD0000  4:f
5611          *
5612          *  notice we build the stack from down to top: MDD first, then MDT */
5613
5614         name_size = MAX_OBD_NAME;
5615         uuid_size = MAX_OBD_NAME;
5616
5617         OBD_ALLOC(name, name_size);
5618         OBD_ALLOC(uuid, uuid_size);
5619         if (name == NULL || uuid == NULL)
5620                 GOTO(cleanup_mem, rc = -ENOMEM);
5621
5622         OBD_ALLOC_PTR(bufs);
5623         if (!bufs)
5624                 GOTO(cleanup_mem, rc = -ENOMEM);
5625
5626         strcpy(name, dev);
5627         p = strstr(name, "-MDT");
5628         if (p == NULL)
5629                 GOTO(free_bufs, rc = -ENOMEM);
5630         p[3] = 'D';
5631
5632         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
5633
5634         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
5635         if (lprof == NULL || lprof->lp_dt == NULL) {
5636                 CERROR("can't find the profile: %s\n",
5637                        lustre_cfg_string(cfg, 0));
5638                 GOTO(free_bufs, rc = -EINVAL);
5639         }
5640
5641         lustre_cfg_bufs_reset(bufs, name);
5642         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
5643         lustre_cfg_bufs_set_string(bufs, 2, uuid);
5644         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
5645
5646         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5647         if (!lcfg)
5648                 GOTO(put_profile, rc = -ENOMEM);
5649         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
5650
5651         rc = class_attach(lcfg);
5652         if (rc)
5653                 GOTO(lcfg_cleanup, rc);
5654
5655         obd = class_name2obd(name);
5656         if (!obd) {
5657                 CERROR("Can not find obd %s (%s in config)\n",
5658                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
5659                 GOTO(lcfg_cleanup, rc = -EINVAL);
5660         }
5661
5662         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5663
5664         lustre_cfg_bufs_reset(bufs, name);
5665         lustre_cfg_bufs_set_string(bufs, 1, uuid);
5666         lustre_cfg_bufs_set_string(bufs, 2, dev);
5667         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
5668
5669         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5670         if (!lcfg)
5671                 GOTO(class_detach, rc = -ENOMEM);
5672         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
5673
5674         rc = class_setup(obd, lcfg);
5675         if (rc)
5676                 GOTO(class_detach, rc);
5677
5678         /* connect to MDD we just setup */
5679         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
5680         if (rc)
5681                 GOTO(class_detach, rc);
5682
5683         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
5684         LASSERT(site);
5685         LASSERT(mdt_lu_site(mdt) == NULL);
5686         mdt->mdt_lu_dev.ld_site = site;
5687         site->ls_top_dev = &mdt->mdt_lu_dev;
5688         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
5689
5690         /* now connect to bottom OSD */
5691         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
5692         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
5693         if (rc)
5694                 GOTO(class_detach, rc);
5695         mdt->mdt_bottom =
5696                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
5697
5698         rc = lu_env_refill((struct lu_env *)env);
5699         if (rc != 0)
5700                 CERROR("Failure to refill session: '%d'\n", rc);
5701
5702         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
5703
5704         EXIT;
5705 class_detach:
5706         if (rc)
5707                 class_detach(obd, lcfg);
5708 lcfg_cleanup:
5709         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5710 put_profile:
5711         class_put_profile(lprof);
5712 free_bufs:
5713         OBD_FREE_PTR(bufs);
5714 cleanup_mem:
5715         if (name)
5716                 OBD_FREE(name, name_size);
5717         if (uuid)
5718                 OBD_FREE(uuid, uuid_size);
5719         RETURN(rc);
5720 }
5721
5722 /* setup quota master target on MDT0 */
5723 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
5724                           struct lustre_cfg *cfg)
5725 {
5726         struct obd_device       *obd;
5727         char                    *dev = lustre_cfg_string(cfg, 0);
5728         char                    *qmtname, *uuid, *p;
5729         struct lustre_cfg_bufs  *bufs;
5730         struct lustre_cfg       *lcfg;
5731         struct lustre_profile   *lprof;
5732         struct obd_connect_data *data;
5733         int                      rc;
5734         ENTRY;
5735
5736         LASSERT(mdt->mdt_qmt_exp == NULL);
5737         LASSERT(mdt->mdt_qmt_dev == NULL);
5738
5739         /* quota master is on MDT0 only for now */
5740         if (mdt->mdt_seq_site.ss_node_id != 0)
5741                 RETURN(0);
5742
5743         /* MGS generates config commands which look as follows:
5744          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
5745          *                    3:lustre-MDT0000-mdtlov  4:f
5746          *
5747          * We generate the QMT name from the MDT one, just replacing MD with QM
5748          * after all the preparations, the logical equivalent will be:
5749          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
5750          *                    3:lustre-MDT0000-osd  4:f */
5751         OBD_ALLOC(qmtname, MAX_OBD_NAME);
5752         OBD_ALLOC(uuid, UUID_MAX);
5753         OBD_ALLOC_PTR(bufs);
5754         OBD_ALLOC_PTR(data);
5755         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
5756                 GOTO(cleanup_mem, rc = -ENOMEM);
5757
5758         strcpy(qmtname, dev);
5759         p = strstr(qmtname, "-MDT");
5760         if (p == NULL)
5761                 GOTO(cleanup_mem, rc = -ENOMEM);
5762         /* replace MD with QM */
5763         p[1] = 'Q';
5764         p[2] = 'M';
5765
5766         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
5767
5768         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
5769         if (lprof == NULL || lprof->lp_dt == NULL) {
5770                 CERROR("can't find profile for %s\n",
5771                        lustre_cfg_string(cfg, 0));
5772                 GOTO(cleanup_mem, rc = -EINVAL);
5773         }
5774
5775         lustre_cfg_bufs_reset(bufs, qmtname);
5776         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
5777         lustre_cfg_bufs_set_string(bufs, 2, uuid);
5778         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
5779
5780         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5781         if (!lcfg)
5782                 GOTO(put_profile, rc = -ENOMEM);
5783         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
5784
5785         rc = class_attach(lcfg);
5786         if (rc)
5787                 GOTO(lcfg_cleanup, rc);
5788
5789         obd = class_name2obd(qmtname);
5790         if (!obd) {
5791                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
5792                        lustre_cfg_string(cfg, 0));
5793                 GOTO(lcfg_cleanup, rc = -EINVAL);
5794         }
5795
5796         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5797
5798         lustre_cfg_bufs_reset(bufs, qmtname);
5799         lustre_cfg_bufs_set_string(bufs, 1, uuid);
5800         lustre_cfg_bufs_set_string(bufs, 2, dev);
5801
5802         /* for quota, the next device should be the OSD device */
5803         lustre_cfg_bufs_set_string(bufs, 3,
5804                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
5805
5806         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5807         if (!lcfg)
5808                 GOTO(class_detach, rc = -ENOMEM);
5809         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
5810
5811         rc = class_setup(obd, lcfg);
5812         if (rc)
5813                 GOTO(class_detach, rc);
5814
5815         mdt->mdt_qmt_dev = obd->obd_lu_dev;
5816
5817         /* configure local quota objects */
5818         if (CFS_FAIL_CHECK(OBD_FAIL_QUOTA_INIT))
5819                 rc = -EBADF;
5820         else
5821                 rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
5822                                                            &mdt->mdt_lu_dev,
5823                                                            mdt->mdt_qmt_dev);
5824         if (rc)
5825                 GOTO(class_cleanup, rc);
5826
5827         /* connect to quota master target */
5828         data->ocd_connect_flags = OBD_CONNECT_VERSION;
5829         data->ocd_version = LUSTRE_VERSION_CODE;
5830         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
5831                          data, NULL);
5832         if (rc) {
5833                 CERROR("cannot connect to quota master device %s (%d)\n",
5834                        qmtname, rc);
5835                 GOTO(class_cleanup, rc);
5836         }
5837
5838         EXIT;
5839 class_cleanup:
5840         if (rc) {
5841                 class_manual_cleanup(obd);
5842                 mdt->mdt_qmt_dev = NULL;
5843                 GOTO(lcfg_cleanup, rc);
5844         }
5845 class_detach:
5846         if (rc)
5847                 class_detach(obd, lcfg);
5848 lcfg_cleanup:
5849         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5850 put_profile:
5851         class_put_profile(lprof);
5852 cleanup_mem:
5853         if (bufs)
5854                 OBD_FREE_PTR(bufs);
5855         if (qmtname)
5856                 OBD_FREE(qmtname, MAX_OBD_NAME);
5857         if (uuid)
5858                 OBD_FREE(uuid, UUID_MAX);
5859         if (data)
5860                 OBD_FREE_PTR(data);
5861         return rc;
5862 }
5863
5864 /* Shutdown quota master target associated with mdt */
5865 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
5866 {
5867         ENTRY;
5868
5869         if (mdt->mdt_qmt_exp == NULL)
5870                 RETURN_EXIT;
5871         LASSERT(mdt->mdt_qmt_dev != NULL);
5872
5873         /* the qmt automatically shuts down when the mdt disconnects */
5874         obd_disconnect(mdt->mdt_qmt_exp);
5875         mdt->mdt_qmt_exp = NULL;
5876         mdt->mdt_qmt_dev = NULL;
5877         EXIT;
5878 }
5879
5880 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
5881  * for now. This will be removed along with converting rest of MDT code
5882  * to use tgt_session_info */
5883 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
5884 {
5885         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5886         int                      rc;
5887
5888         if (unlikely(info->mti_object == NULL))
5889                 return -EPROTO;
5890
5891         rc = mdt_getxattr(info);
5892
5893         mdt_thread_info_fini(info);
5894         return rc;
5895 }
5896
5897 static int mdt_llog_open(struct tgt_session_info *tsi)
5898 {
5899         ENTRY;
5900
5901         if (!mdt_changelog_allow(tsi2mdt_info(tsi)))
5902                 RETURN(err_serious(-EACCES));
5903
5904         RETURN(tgt_llog_open(tsi));
5905 }
5906
5907 #define OBD_FAIL_OST_READ_NET   OBD_FAIL_OST_BRW_NET
5908 #define OBD_FAIL_OST_WRITE_NET  OBD_FAIL_OST_BRW_NET
5909 #define OST_BRW_READ    OST_READ
5910 #define OST_BRW_WRITE   OST_WRITE
5911
5912 static struct tgt_handler mdt_tgt_handlers[] = {
5913 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5914                 0,                      MDS_CONNECT,    mdt_tgt_connect,
5915                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
5916 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5917                 0,                      MDS_DISCONNECT, tgt_disconnect,
5918                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
5919 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5920                 HAS_REPLY,              MDS_SET_INFO,   mdt_set_info,
5921                 &RQF_MDT_SET_INFO, LUSTRE_MDS_VERSION),
5922 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
5923 TGT_MDT_HDL(HAS_REPLY,          MDS_GET_ROOT,   mdt_get_root),
5924 TGT_MDT_HDL(HAS_BODY,           MDS_GETATTR,    mdt_getattr),
5925 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_GETATTR_NAME,
5926                                                         mdt_getattr_name),
5927 TGT_MDT_HDL(HAS_BODY,           MDS_GETXATTR,   mdt_tgt_getxattr),
5928 TGT_MDT_HDL(HAS_REPLY,          MDS_STATFS,     mdt_statfs),
5929 TGT_MDT_HDL(IS_MUTABLE,         MDS_REINT,      mdt_reint),
5930 TGT_MDT_HDL(HAS_BODY,           MDS_CLOSE,      mdt_close),
5931 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_READPAGE,   mdt_readpage),
5932 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_SYNC,       mdt_sync),
5933 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
5934 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_PROGRESS,
5935                                                         mdt_hsm_progress),
5936 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_REGISTER,
5937                                                         mdt_hsm_ct_register),
5938 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_UNREGISTER,
5939                                                         mdt_hsm_ct_unregister),
5940 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_STATE_GET,
5941                                                         mdt_hsm_state_get),
5942 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_STATE_SET,
5943                                                         mdt_hsm_state_set),
5944 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_ACTION,       mdt_hsm_action),
5945 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_REQUEST,
5946                                                         mdt_hsm_request),
5947 TGT_MDT_HDL(HAS_KEY | HAS_BODY | HAS_REPLY | IS_MUTABLE,
5948             MDS_SWAP_LAYOUTS,
5949             mdt_swap_layouts),
5950 TGT_MDT_HDL(IS_MUTABLE,         MDS_RMFID,      mdt_rmfid),
5951 TGT_MDT_HDL(IS_MUTABLE,         MDS_BATCH,      mdt_batch),
5952 };
5953
5954 static struct tgt_handler mdt_io_ops[] = {
5955 TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY, OST_BRW_READ, tgt_brw_read,
5956                                                         mdt_hp_brw),
5957 TGT_OST_HDL_HP(HAS_BODY | IS_MUTABLE,    OST_BRW_WRITE, tgt_brw_write,
5958                                                         mdt_hp_brw),
5959 TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY | IS_MUTABLE,
5960                                          OST_PUNCH,     mdt_punch_hdl,
5961                                                         mdt_hp_punch),
5962 TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_SYNC,     mdt_data_sync),
5963 TGT_OST_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, OST_FALLOCATE,
5964                                                         mdt_fallocate_hdl),
5965 TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_SEEK, tgt_lseek),
5966 TGT_RPC_HANDLER(OST_FIRST_OPC,
5967                 0,                      OST_SET_INFO,   mdt_io_set_info,
5968                 &RQF_OBD_SET_INFO, LUSTRE_OST_VERSION),
5969 };
5970
5971 static struct tgt_handler mdt_sec_ctx_ops[] = {
5972 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
5973 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
5974 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
5975 };
5976
5977 static struct tgt_handler mdt_quota_ops[] = {
5978 TGT_QUOTA_HDL(HAS_REPLY,                QUOTA_DQACQ,      mdt_quota_dqacq),
5979 };
5980
5981 static struct tgt_handler mdt_llog_handlers[] = {
5982         TGT_LLOG_HDL(0, LLOG_ORIGIN_HANDLE_CREATE,      mdt_llog_open),
5983         TGT_LLOG_HDL(0, LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
5984         TGT_LLOG_HDL(0, LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
5985         TGT_LLOG_HDL(0, LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
5986 };
5987
5988 static struct tgt_opc_slice mdt_common_slice[] = {
5989         {
5990                 .tos_opc_start  = MDS_FIRST_OPC,
5991                 .tos_opc_end    = MDS_LAST_OPC,
5992                 .tos_hs         = mdt_tgt_handlers
5993         },
5994         {
5995                 .tos_opc_start  = OBD_FIRST_OPC,
5996                 .tos_opc_end    = OBD_LAST_OPC,
5997                 .tos_hs         = tgt_obd_handlers
5998         },
5999         {
6000                 .tos_opc_start  = LDLM_FIRST_OPC,
6001                 .tos_opc_end    = LDLM_LAST_OPC,
6002                 .tos_hs         = tgt_dlm_handlers
6003         },
6004         {
6005                 .tos_opc_start  = SEC_FIRST_OPC,
6006                 .tos_opc_end    = SEC_LAST_OPC,
6007                 .tos_hs         = mdt_sec_ctx_ops
6008         },
6009         {
6010                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
6011                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
6012                 .tos_hs         = tgt_out_handlers
6013         },
6014         {
6015                 .tos_opc_start  = FLD_FIRST_OPC,
6016                 .tos_opc_end    = FLD_LAST_OPC,
6017                 .tos_hs         = fld_handlers
6018         },
6019         {
6020                 .tos_opc_start  = SEQ_FIRST_OPC,
6021                 .tos_opc_end    = SEQ_LAST_OPC,
6022                 .tos_hs         = seq_handlers
6023         },
6024         {
6025                 .tos_opc_start  = QUOTA_DQACQ,
6026                 .tos_opc_end    = QUOTA_LAST_OPC,
6027                 .tos_hs         = mdt_quota_ops
6028         },
6029         {
6030                 .tos_opc_start  = LLOG_FIRST_OPC,
6031                 .tos_opc_end    = LLOG_LAST_OPC,
6032                 .tos_hs         = mdt_llog_handlers
6033         },
6034         {
6035                 .tos_opc_start  = LFSCK_FIRST_OPC,
6036                 .tos_opc_end    = LFSCK_LAST_OPC,
6037                 .tos_hs         = tgt_lfsck_handlers
6038         },
6039         {
6040                 .tos_opc_start  = OST_FIRST_OPC,
6041                 .tos_opc_end    = OST_LAST_OPC,
6042                 .tos_hs         = mdt_io_ops
6043         },
6044         {
6045                 .tos_hs         = NULL
6046         }
6047 };
6048
6049 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
6050 {
6051         struct md_device *next = m->mdt_child;
6052         struct lu_device *d = &m->mdt_lu_dev;
6053         struct obd_device *obd = mdt2obd_dev(m);
6054         struct lfsck_stop stop;
6055
6056         ENTRY;
6057         stop.ls_status = LS_PAUSED;
6058         stop.ls_flags = 0;
6059         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
6060
6061         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
6062
6063         mdt_restriper_stop(m);
6064         ping_evictor_stop();
6065
6066         /* Remove the HSM /proc entry so the coordinator cannot be
6067          * restarted by a user while it's shutting down.
6068          */
6069         mdt_hsm_cdt_stop(m);
6070
6071         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
6072         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
6073
6074         if (m->mdt_namespace != NULL)
6075                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
6076                                           d->ld_obd->obd_force);
6077
6078         obd_exports_barrier(obd);
6079         obd_zombie_barrier();
6080
6081         mdt_quota_fini(env, m);
6082
6083         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
6084
6085         /* Calling the cleanup functions in the same order as in the mdt_init0
6086          * error path
6087          */
6088         mdt_tunables_fini(m);
6089
6090         target_recovery_fini(obd);
6091         upcall_cache_cleanup(m->mdt_identity_cache);
6092         m->mdt_identity_cache = NULL;
6093
6094         tgt_fini(env, &m->mdt_lut);
6095
6096         mdt_hsm_cdt_fini(m);
6097
6098         if (m->mdt_los != NULL) {
6099                 local_oid_storage_fini(env, m->mdt_los);
6100                 m->mdt_los = NULL;
6101         }
6102
6103         if (m->mdt_namespace != NULL) {
6104                 ldlm_namespace_free_post(m->mdt_namespace);
6105                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
6106         }
6107
6108         if (m->mdt_md_root != NULL) {
6109                 mdt_object_put(env, m->mdt_md_root);
6110                 m->mdt_md_root = NULL;
6111         }
6112
6113         mdt_seq_fini(env, m);
6114
6115         mdt_fld_fini(env, m);
6116
6117         /*
6118          * Finish the stack
6119          */
6120         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
6121
6122         LASSERT(atomic_read(&d->ld_ref) == 0);
6123
6124         server_put_mount(mdt_obd_name(m), true);
6125
6126         EXIT;
6127 }
6128
6129 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
6130
6131 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
6132                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
6133 {
6134         const struct dt_device_param *dt_conf;
6135         struct mdt_thread_info *info;
6136         struct obd_device *obd;
6137         const char *dev = lustre_cfg_string(cfg, 0);
6138         const char *num = lustre_cfg_string(cfg, 2);
6139         struct tg_grants_data *tgd = &m->mdt_lut.lut_tgd;
6140         struct lustre_mount_info *lmi = NULL;
6141         struct lustre_sb_info *lsi;
6142         struct lu_site *s;
6143         struct seq_server_site *ss_site;
6144         const char *identity_upcall = "NONE";
6145         struct md_device *next;
6146         struct lu_fid fid;
6147         int rc;
6148         long node_id;
6149         mntopt_t mntopts;
6150         ENTRY;
6151
6152         lu_device_init(&m->mdt_lu_dev, ldt);
6153         /*
6154          * Environment (env) might be missing mdt_thread_key values at that
6155          * point, if device is allocated when mdt_thread_key is in QUIESCENT
6156          * mode.
6157          *
6158          * Usually device allocation path doesn't use module key values, but
6159          * mdt has to do a lot of work here, so allocate key value.
6160          */
6161         rc = lu_env_refill((struct lu_env *)env);
6162         if (rc != 0)
6163                 RETURN(rc);
6164
6165         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
6166         LASSERT(info != NULL);
6167
6168         obd = class_name2obd(dev);
6169         LASSERT(obd != NULL);
6170
6171         m->mdt_max_mdsize = MAX_MD_SIZE_OLD;
6172         m->mdt_opts.mo_evict_tgt_nids = 1;
6173         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
6174
6175         lmi = server_get_mount(dev);
6176         if (lmi == NULL) {
6177                 CERROR("Cannot get mount info for %s!\n", dev);
6178                 RETURN(-EFAULT);
6179         } else {
6180                 lsi = s2lsi(lmi->lmi_sb);
6181                 LASSERT(lsi->lsi_lmd);
6182                 /* CMD is supported only in IAM mode */
6183                 LASSERT(num);
6184                 rc = kstrtol(num, 10, &node_id);
6185                 if (rc)
6186                         RETURN(rc);
6187
6188                 obd_obt_init(obd);
6189                 if (test_bit(LMD_FLG_SKIP_LFSCK, lsi->lsi_lmd->lmd_flags))
6190                         m->mdt_skip_lfsck = 1;
6191                 if (test_bit(LMD_FLG_NO_CREATE, lsi->lsi_lmd->lmd_flags))
6192                         m->mdt_lut.lut_no_create = 1;
6193         }
6194
6195         /* Just try to get a DoM lock by default. Otherwise, having a group
6196          * lock granted, it may get blocked for a long time. */
6197         m->mdt_opts.mo_dom_lock = TRYLOCK_DOM_ON_OPEN;
6198         /* DoM files are read at open and data is packed in the reply */
6199         m->mdt_opts.mo_dom_read_open = 1;
6200
6201         m->mdt_squash.rsi_uid = 0;
6202         m->mdt_squash.rsi_gid = 0;
6203         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
6204         spin_lock_init(&m->mdt_squash.rsi_lock);
6205         spin_lock_init(&m->mdt_lock);
6206         m->mdt_enable_chprojid_gid = 0;
6207         m->mdt_enable_dir_migration = 1;
6208         m->mdt_enable_dir_restripe = 0;
6209         m->mdt_enable_dir_auto_split = 0;
6210         m->mdt_enable_parallel_rename_dir = 1;
6211         m->mdt_enable_parallel_rename_file = 1;
6212         m->mdt_enable_remote_dir = 1;
6213         m->mdt_enable_remote_dir_gid = 0;
6214         m->mdt_enable_remote_rename = 1;
6215         m->mdt_enable_striped_dir = 1;
6216         m->mdt_enable_dmv_implicit_inherit = 1;
6217         m->mdt_dir_restripe_nsonly = 1;
6218         m->mdt_max_mod_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
6219
6220         atomic_set(&m->mdt_mds_mds_conns, 0);
6221         atomic_set(&m->mdt_async_commit_count, 0);
6222         atomic_set(&m->mdt_dmv_old_client_count, 0);
6223
6224         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
6225         m->mdt_lu_dev.ld_obd = obd;
6226         /* Set this lu_device to obd for error handling purposes. */
6227         obd->obd_lu_dev = &m->mdt_lu_dev;
6228
6229         strncpy(m->mdt_job_xattr, XATTR_NAME_JOB_DEFAULT, XATTR_JOB_MAX_LEN);
6230
6231         /* init the stack */
6232         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
6233         if (rc) {
6234                 CERROR("%s: Can't init device stack, rc %d\n",
6235                        mdt_obd_name(m), rc);
6236                 GOTO(err_lmi, rc);
6237         }
6238
6239         s = mdt_lu_site(m);
6240         ss_site = mdt_seq_site(m);
6241         s->ld_seq_site = ss_site;
6242         ss_site->ss_lu = s;
6243
6244         /* set server index */
6245         ss_site->ss_node_id = node_id;
6246
6247         /* failover is the default
6248          * FIXME: we do not failout mds0/mgs, which may cause some problems.
6249          * assumed whose ss_node_id == 0 XXX
6250          * */
6251         obd->obd_replayable = 1;
6252         /* No connection accepted until configurations will finish */
6253         obd->obd_no_conn = 1;
6254
6255         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
6256                 char *str = lustre_cfg_string(cfg, 4);
6257                 if (strchr(str, 'n')) {
6258                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
6259                         obd->obd_replayable = 0;
6260                 }
6261         }
6262
6263         rc = mdt_fld_init(env, mdt_obd_name(m), m);
6264         if (rc)
6265                 GOTO(err_fini_stack, rc);
6266
6267         rc = mdt_seq_init(env, m);
6268         if (rc)
6269                 GOTO(err_fini_fld, rc);
6270
6271         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
6272                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
6273         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
6274                                               LDLM_NAMESPACE_SERVER,
6275                                               LDLM_NAMESPACE_GREEDY,
6276                                               LDLM_NS_TYPE_MDT);
6277         if (IS_ERR(m->mdt_namespace)) {
6278                 rc = PTR_ERR(m->mdt_namespace);
6279                 CERROR("%s: unable to create server namespace: rc = %d\n",
6280                        obd->obd_name, rc);
6281                 m->mdt_namespace = NULL;
6282                 GOTO(err_fini_seq, rc);
6283         }
6284
6285         m->mdt_namespace->ns_lvbp = m;
6286         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
6287
6288         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
6289         /* set obd_namespace for compatibility with old code */
6290         obd->obd_namespace = m->mdt_namespace;
6291
6292         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
6293                       OBD_FAIL_MDS_ALL_REQUEST_NET,
6294                       OBD_FAIL_MDS_ALL_REPLY_NET);
6295         if (rc)
6296                 GOTO(err_free_ns, rc);
6297
6298         /* Amount of available space excluded from granting and reserved
6299          * for metadata. It is a percentage of the total MDT size. */
6300         tgd->tgd_reserved_pcnt = 10;
6301
6302         if (ONE_MB_BRW_SIZE < (1U << tgd->tgd_blockbits))
6303                 m->mdt_brw_size = 1U << tgd->tgd_blockbits;
6304         else
6305                 m->mdt_brw_size = ONE_MB_BRW_SIZE;
6306
6307         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
6308                 GOTO(err_tgt, rc = -ENOENT);
6309
6310         fid.f_seq = FID_SEQ_LOCAL_NAME;
6311         fid.f_oid = 1;
6312         fid.f_ver = 0;
6313         rc = local_oid_storage_init(env, m->mdt_bottom, &fid, &m->mdt_los);
6314         if (rc != 0)
6315                 GOTO(err_tgt, rc);
6316
6317         rc = mdt_hsm_cdt_init(m);
6318         if (rc != 0) {
6319                 CERROR("%s: error initializing coordinator, rc %d\n",
6320                        mdt_obd_name(m), rc);
6321                 GOTO(err_los_fini, rc);
6322         }
6323
6324         tgt_adapt_sptlrpc_conf(&m->mdt_lut);
6325
6326         next = m->mdt_child;
6327         dt_conf = next->md_ops->mdo_dtconf_get(env, next);
6328
6329         mntopts = dt_conf->ddp_mntopts;
6330
6331         if (mntopts & MNTOPT_USERXATTR)
6332                 m->mdt_opts.mo_user_xattr = 1;
6333         else
6334                 m->mdt_opts.mo_user_xattr = 0;
6335
6336         m->mdt_max_ea_size = dt_conf->ddp_max_ea_size;
6337
6338         if (mntopts & MNTOPT_ACL)
6339                 m->mdt_opts.mo_acl = 1;
6340         else
6341                 m->mdt_opts.mo_acl = 0;
6342
6343         m->mdt_opts.mo_enable_strict_som = 1;
6344
6345         /* XXX: to support suppgid for ACL, we enable identity_upcall
6346          * by default, otherwise, maybe got unexpected -EACCESS. */
6347         if (m->mdt_opts.mo_acl)
6348                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
6349
6350         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
6351                                                 identity_upcall,
6352                                                 UC_IDCACHE_HASH_SIZE,
6353                                                 1200, /* entry expire: 20 mn */
6354                                                 30, /* acquire expire: 30 s */
6355                                                 true, /* acquire can replay */
6356                                                 &mdt_identity_upcall_cache_ops);
6357         if (IS_ERR(m->mdt_identity_cache)) {
6358                 rc = PTR_ERR(m->mdt_identity_cache);
6359                 m->mdt_identity_cache = NULL;
6360                 GOTO(err_free_hsm, rc);
6361         }
6362
6363         rc = mdt_tunables_init(m, dev);
6364         if (rc) {
6365                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
6366                 GOTO(err_recovery, rc);
6367         }
6368
6369         rc = mdt_quota_init(env, m, cfg);
6370         if (rc)
6371                 GOTO(err_procfs, rc);
6372
6373         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
6374         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
6375                            "mdt_ldlm_client", m->mdt_ldlm_client);
6376
6377         ping_evictor_start();
6378
6379         /* recovery will be started upon mdt_prepare()
6380          * when the whole stack is complete and ready
6381          * to serve the requests */
6382
6383         /* Reduce the initial timeout on an MDS because it doesn't need such
6384          * a long timeout as an OST does. Adaptive timeouts will adjust this
6385          * value appropriately. */
6386         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
6387                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
6388
6389         if (test_bit(LMD_FLG_LOCAL_RECOV, lsi->lsi_lmd->lmd_flags))
6390                 m->mdt_lut.lut_local_recovery = 1;
6391
6392         rc = mdt_restriper_start(m);
6393         if (rc)
6394                 GOTO(err_ping_evictor, rc);
6395
6396         RETURN(0);
6397
6398 err_ping_evictor:
6399         ping_evictor_stop();
6400 err_procfs:
6401         mdt_tunables_fini(m);
6402 err_recovery:
6403         upcall_cache_cleanup(m->mdt_identity_cache);
6404         m->mdt_identity_cache = NULL;
6405 err_free_hsm:
6406         mdt_hsm_cdt_fini(m);
6407 err_los_fini:
6408         local_oid_storage_fini(env, m->mdt_los);
6409         m->mdt_los = NULL;
6410 err_tgt:
6411         /* keep recoverable clients */
6412         obd->obd_fail = 1;
6413         target_recovery_fini(obd);
6414         obd_exports_barrier(obd);
6415         obd_zombie_barrier();
6416         tgt_fini(env, &m->mdt_lut);
6417 err_free_ns:
6418         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
6419         obd->obd_namespace = m->mdt_namespace = NULL;
6420 err_fini_seq:
6421         mdt_seq_fini(env, m);
6422 err_fini_fld:
6423         mdt_fld_fini(env, m);
6424 err_fini_stack:
6425         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
6426 err_lmi:
6427         if (lmi)
6428                 server_put_mount(dev, true);
6429         return(rc);
6430 }
6431
6432 /* For interoperability, the left element is old parameter, the right one
6433  * is the new version of the parameter, if some parameter is deprecated,
6434  * the new version should be set as NULL. */
6435 static struct cfg_interop_param mdt_interop_param[] = {
6436         { "mdt.group_upcall",   NULL },
6437         { "mdt.quota_type",     NULL },
6438         { "mdd.quota_type",     NULL },
6439         { "mdt.som",            NULL },
6440         { "mdt.rootsquash",     "mdt.root_squash" },
6441         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
6442         { NULL }
6443 };
6444
6445 /* used by MGS to process specific configurations */
6446 static int mdt_process_config(const struct lu_env *env,
6447                               struct lu_device *d, struct lustre_cfg *cfg)
6448 {
6449         struct mdt_device *m = mdt_dev(d);
6450         struct md_device *md_next = m->mdt_child;
6451         struct lu_device *next = md2lu_dev(md_next);
6452         int rc;
6453         ENTRY;
6454
6455         switch (cfg->lcfg_command) {
6456         case LCFG_PARAM: {
6457                 struct obd_device *obd = d->ld_obd;
6458                 /* For interoperability */
6459                 struct cfg_interop_param *ptr = NULL;
6460                 struct lustre_cfg *old_cfg = NULL;
6461                 char *param = NULL;
6462                 ssize_t count;
6463
6464                 param = lustre_cfg_string(cfg, 1);
6465                 if (param == NULL) {
6466                         CERROR("param is empty\n");
6467                         rc = -EINVAL;
6468                         break;
6469                 }
6470
6471                 ptr = class_find_old_param(param, mdt_interop_param);
6472                 if (ptr != NULL) {
6473                         if (ptr->new_param == NULL) {
6474                                 rc = 0;
6475                                 CWARN("For interoperability, skip this %s."
6476                                       " It is obsolete.\n", ptr->old_param);
6477                                 break;
6478                         }
6479
6480                         CWARN("Found old param %s, changed it to %s.\n",
6481                               ptr->old_param, ptr->new_param);
6482
6483                         old_cfg = cfg;
6484                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
6485                         if (IS_ERR(cfg)) {
6486                                 rc = PTR_ERR(cfg);
6487                                 break;
6488                         }
6489                 }
6490
6491                 count = class_modify_config(cfg, PARAM_MDT,
6492                                             &obd->obd_kset.kobj);
6493                 if (count < 0) {
6494                         struct coordinator *cdt = &m->mdt_coordinator;
6495
6496                         /* is it an HSM var ? */
6497                         count = class_modify_config(cfg, PARAM_HSM,
6498                                                     &cdt->cdt_hsm_kobj);
6499                         if (count < 0)
6500                                 /* we don't understand; pass it on */
6501                                 rc = next->ld_ops->ldo_process_config(env, next,
6502                                                                       cfg);
6503                         else
6504                                 rc = count > 0 ? 0 : count;
6505                 } else {
6506                         rc = count > 0 ? 0 : count;
6507                 }
6508
6509                 if (old_cfg)
6510                         OBD_FREE(cfg, lustre_cfg_len(cfg->lcfg_bufcount,
6511                                                      cfg->lcfg_buflens));
6512                 break;
6513         }
6514         default:
6515                 /* others are passed further */
6516                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
6517                 break;
6518         }
6519         RETURN(rc);
6520 }
6521
6522 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
6523                                           const struct lu_object_header *hdr,
6524                                           struct lu_device *d)
6525 {
6526         struct mdt_object *mo;
6527
6528         ENTRY;
6529
6530         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
6531         if (mo != NULL) {
6532                 struct lu_object *o;
6533                 struct lu_object_header *h;
6534
6535                 o = &mo->mot_obj;
6536                 h = &mo->mot_header;
6537                 lu_object_header_init(h);
6538                 lu_object_init(o, h, d);
6539                 lu_object_add_top(h, o);
6540                 o->lo_ops = &mdt_obj_ops;
6541                 spin_lock_init(&mo->mot_write_lock);
6542                 mutex_init(&mo->mot_som_mutex);
6543                 mutex_init(&mo->mot_lov_mutex);
6544                 init_rwsem(&mo->mot_dom_sem);
6545                 init_rwsem(&mo->mot_open_sem);
6546                 atomic_set(&mo->mot_open_count, 0);
6547                 mo->mot_restripe_offset = 0;
6548                 INIT_LIST_HEAD(&mo->mot_restripe_linkage);
6549                 mo->mot_lsom_size = 0;
6550                 mo->mot_lsom_blocks = 0;
6551                 mo->mot_lsom_inited = false;
6552                 RETURN(o);
6553         }
6554         RETURN(NULL);
6555 }
6556
6557 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
6558                            const struct lu_object_conf *unused)
6559 {
6560         struct mdt_device *d = mdt_dev(o->lo_dev);
6561         struct lu_device  *under;
6562         struct lu_object  *below;
6563         int                rc = 0;
6564         ENTRY;
6565
6566         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
6567                PFID(lu_object_fid(o)));
6568
6569         under = &d->mdt_child->md_lu_dev;
6570         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
6571         if (below != NULL) {
6572                 lu_object_add(o, below);
6573         } else
6574                 rc = -ENOMEM;
6575
6576         RETURN(rc);
6577 }
6578
6579 static void mdt_object_free_rcu(struct rcu_head *head)
6580 {
6581         struct mdt_object *mo = container_of(head, struct mdt_object,
6582                                              mot_header.loh_rcu);
6583
6584         kmem_cache_free(mdt_object_kmem, mo);
6585 }
6586
6587 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
6588 {
6589         struct mdt_object *mo = mdt_obj(o);
6590         struct lu_object_header *h;
6591         ENTRY;
6592
6593         h = o->lo_header;
6594         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
6595                PFID(lu_object_fid(o)));
6596
6597         LASSERT(atomic_read(&mo->mot_open_count) == 0);
6598         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
6599
6600         lu_object_fini(o);
6601         lu_object_header_fini(h);
6602         OBD_FREE_PRE(mo, sizeof(*mo), "slab-freed");
6603         call_rcu(&mo->mot_header.loh_rcu, mdt_object_free_rcu);
6604
6605         EXIT;
6606 }
6607
6608 static int mdt_object_print(const struct lu_env *env, void *cookie,
6609                             lu_printer_t p, const struct lu_object *o)
6610 {
6611         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
6612
6613         return (*p)(env, cookie,
6614                     LUSTRE_MDT_NAME"-object@%p(%s %s, writecount=%d)",
6615                     mdto, mdto->mot_lov_created ? "lov_created" : "",
6616                     mdto->mot_cache_attr ? "cache_attr" : "",
6617                     mdto->mot_write_count);
6618 }
6619
6620 static int mdt_prepare(const struct lu_env *env,
6621                 struct lu_device *pdev,
6622                 struct lu_device *cdev)
6623 {
6624         struct mdt_device *mdt = mdt_dev(cdev);
6625         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
6626         struct obd_device *obd = cdev->ld_obd;
6627         int rc;
6628
6629         ENTRY;
6630
6631         LASSERT(obd);
6632
6633         rc = next->ld_ops->ldo_prepare(env, cdev, next);
6634         if (rc)
6635                 RETURN(rc);
6636
6637         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
6638         if (rc)
6639                 RETURN(rc);
6640
6641         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
6642         if (rc)
6643                 RETURN(rc);
6644
6645         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
6646         /* The LFSCK instance is registered just now, so it must be there when
6647          * register the namespace to such instance. */
6648         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
6649
6650         if (mdt->mdt_seq_site.ss_node_id == 0) {
6651                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
6652                                                          &mdt->mdt_md_root_fid);
6653                 if (rc)
6654                         RETURN(rc);
6655         }
6656
6657         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
6658
6659         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
6660         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
6661         LASSERT(obd->obd_no_conn);
6662         spin_lock(&obd->obd_dev_lock);
6663         obd->obd_no_conn = 0;
6664         spin_unlock(&obd->obd_dev_lock);
6665
6666         if (obd->obd_recovering == 0)
6667                 mdt_postrecov(env, mdt);
6668
6669         RETURN(rc);
6670 }
6671
6672 const struct lu_device_operations mdt_lu_ops = {
6673         .ldo_object_alloc   = mdt_object_alloc,
6674         .ldo_process_config = mdt_process_config,
6675         .ldo_prepare        = mdt_prepare,
6676 };
6677
6678 static const struct lu_object_operations mdt_obj_ops = {
6679         .loo_object_init    = mdt_object_init,
6680         .loo_object_free    = mdt_object_free,
6681         .loo_object_print   = mdt_object_print
6682 };
6683
6684 static int mdt_obd_set_info_async(const struct lu_env *env,
6685                                   struct obd_export *exp,
6686                                   __u32 keylen, void *key,
6687                                   __u32 vallen, void *val,
6688                                   struct ptlrpc_request_set *set)
6689 {
6690         int rc;
6691
6692         ENTRY;
6693
6694         if (KEY_IS(KEY_SPTLRPC_CONF)) {
6695                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp));
6696                 RETURN(rc);
6697         }
6698
6699         RETURN(0);
6700 }
6701
6702 static inline void mdt_enable_slc(struct mdt_device *mdt)
6703 {
6704         if (mdt->mdt_lut.lut_sync_lock_cancel == SYNC_LOCK_CANCEL_NEVER)
6705                 mdt->mdt_lut.lut_sync_lock_cancel = SYNC_LOCK_CANCEL_BLOCKING;
6706 }
6707
6708 static inline void mdt_disable_slc(struct mdt_device *mdt)
6709 {
6710         if (mdt->mdt_lut.lut_sync_lock_cancel == SYNC_LOCK_CANCEL_BLOCKING)
6711                 mdt->mdt_lut.lut_sync_lock_cancel = SYNC_LOCK_CANCEL_NEVER;
6712 }
6713
6714 /**
6715  * Match client and server connection feature flags.
6716  *
6717  * Compute the compatibility flags for a connection request based on
6718  * features mutually supported by client and server.
6719  *
6720  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
6721  * must not be updated here, otherwise a partially initialized value may
6722  * be exposed. After the connection request is successfully processed,
6723  * the top-level MDT connect request handler atomically updates the export
6724  * connect flags from the obd_connect_data::ocd_connect_flags field of the
6725  * reply. \see mdt_connect().
6726  *
6727  * Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
6728  * full struct obd_connect_data. So care must be taken when accessing fields
6729  * that are not present in struct obd_connect_data_v1. See LU-16.
6730  *
6731  * \param exp   the obd_export associated with this client/target pair
6732  * \param mdt   the target device for the connection
6733  * \param data  stores data for this connect request
6734  *
6735  * \retval 0       success
6736  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
6737  * \retval -EBADE  client and server feature requirements are incompatible
6738  */
6739 static int mdt_connect_internal(const struct lu_env *env,
6740                                 struct obd_export *exp,
6741                                 struct mdt_device *mdt,
6742                                 struct obd_connect_data *data, bool reconnect)
6743 {
6744         const char *obd_name = mdt_obd_name(mdt);
6745         LASSERT(data != NULL);
6746
6747         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
6748
6749         if (mdt->mdt_bottom->dd_rdonly &&
6750             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
6751             !(data->ocd_connect_flags & OBD_CONNECT_RDONLY))
6752                 RETURN(-EACCES);
6753
6754         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
6755                 data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;
6756
6757         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
6758
6759         if (!mdt->mdt_opts.mo_acl)
6760                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
6761
6762         if (!mdt->mdt_opts.mo_user_xattr)
6763                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
6764
6765         if (OCD_HAS_FLAG(data, BRW_SIZE)) {
6766                 data->ocd_brw_size = min(data->ocd_brw_size,
6767                                          mdt->mdt_brw_size);
6768                 if (data->ocd_brw_size == 0) {
6769                         CERROR("%s: cli %s/%p ocd_connect_flags: %#llx "
6770                                "ocd_version: %x ocd_grant: %d ocd_index: %u "
6771                                "ocd_brw_size unexpectedly zero, network data "
6772                                "corruption? Refusing to connect this client\n",
6773                                obd_name, exp->exp_client_uuid.uuid,
6774                                exp, data->ocd_connect_flags, data->ocd_version,
6775                                data->ocd_grant, data->ocd_index);
6776                         return -EPROTO;
6777                 }
6778         }
6779
6780         if (OCD_HAS_FLAG(data, GRANT_PARAM)) {
6781                 struct dt_device_param *ddp = &mdt->mdt_lut.lut_dt_conf;
6782
6783                 /* client is reporting its page size, for future use */
6784                 exp->exp_target_data.ted_pagebits = data->ocd_grant_blkbits;
6785                 data->ocd_grant_blkbits  = mdt->mdt_lut.lut_tgd.tgd_blockbits;
6786                 /* ddp_inodespace may not be power-of-two value, eg. for ldiskfs
6787                  * it's LDISKFS_DIR_REC_LEN(20) = 28. */
6788                 data->ocd_grant_inobits = fls(ddp->ddp_inodespace - 1);
6789                 /* ocd_grant_tax_kb is in 1K byte blocks */
6790                 data->ocd_grant_tax_kb = ddp->ddp_extent_tax >> 10;
6791                 data->ocd_grant_max_blks = ddp->ddp_max_extent_blks;
6792         }
6793
6794         /* Save connect_data we have so far because tgt_grant_connect()
6795          * uses it to calculate grant, and we want to save the client
6796          * version before it is overwritten by LUSTRE_VERSION_CODE. */
6797         exp->exp_connect_data = *data;
6798         if (OCD_HAS_FLAG(data, GRANT))
6799                 tgt_grant_connect(env, exp, data, !reconnect);
6800
6801         if (OCD_HAS_FLAG(data, MAXBYTES))
6802                 data->ocd_maxbytes = mdt->mdt_lut.lut_dt_conf.ddp_maxbytes;
6803
6804         /* NB: Disregard the rule against updating
6805          * exp_connect_data.ocd_connect_flags in this case, since
6806          * tgt_client_new() needs to know if this is a lightweight
6807          * connection, and it is safe to expose this flag before
6808          * connection processing completes. */
6809         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
6810                 spin_lock(&exp->exp_lock);
6811                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
6812                 spin_unlock(&exp->exp_lock);
6813         }
6814
6815         data->ocd_version = LUSTRE_VERSION_CODE;
6816
6817         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
6818                 CWARN("%s: MDS requires FID support, but client not\n",
6819                       obd_name);
6820                 return -EBADE;
6821         }
6822
6823         if (OCD_HAS_FLAG(data, PINGLESS)) {
6824                 if (ptlrpc_pinger_suppress_pings()) {
6825                         spin_lock(&exp->exp_obd->obd_dev_lock);
6826                         list_del_init(&exp->exp_obd_chain_timed);
6827                         spin_unlock(&exp->exp_obd->obd_dev_lock);
6828                 } else {
6829                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
6830                 }
6831         }
6832
6833         data->ocd_max_easize = mdt->mdt_max_ea_size;
6834
6835         /* NB: Disregard the rule against updating
6836          * exp_connect_data.ocd_connect_flags in this case, since
6837          * tgt_client_new() needs to know if this is client supports
6838          * multiple modify RPCs, and it is safe to expose this flag before
6839          * connection processing completes. */
6840         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
6841                 if (mdt_max_mod_rpcs_changed(mdt))
6842                         /* The new mdt.*.max_mod_rpcs_in_flight parameter
6843                          * has not changed since initialization, but the
6844                          * deprecated module parameter was changed,
6845                          * so use that instead.
6846                          */
6847                         data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
6848                 else
6849                         data->ocd_maxmodrpcs = mdt->mdt_max_mod_rpcs_in_flight;
6850                 spin_lock(&exp->exp_lock);
6851                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
6852                 spin_unlock(&exp->exp_lock);
6853         }
6854
6855         if (OCD_HAS_FLAG(data, CKSUM)) {
6856                 __u32 cksum_types = data->ocd_cksum_types;
6857
6858                 tgt_mask_cksum_types(&mdt->mdt_lut, &data->ocd_cksum_types);
6859
6860                 if (unlikely(data->ocd_cksum_types == 0)) {
6861                         CERROR("%s: Connect with checksum support but no "
6862                                "ocd_cksum_types is set\n",
6863                                exp->exp_obd->obd_name);
6864                         RETURN(-EPROTO);
6865                 }
6866
6867                 CDEBUG(D_RPCTRACE, "%s: cli %s supports cksum type %x, return "
6868                        "%x\n", exp->exp_obd->obd_name, obd_export_nid2str(exp),
6869                        cksum_types, data->ocd_cksum_types);
6870         } else {
6871                 /* This client does not support OBD_CONNECT_CKSUM
6872                  * fall back to CRC32 */
6873                 CDEBUG(D_RPCTRACE, "%s: cli %s does not support "
6874                        "OBD_CONNECT_CKSUM, CRC32 will be used\n",
6875                        exp->exp_obd->obd_name, obd_export_nid2str(exp));
6876         }
6877
6878         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
6879             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
6880                 atomic_inc(&mdt->mdt_mds_mds_conns);
6881                 mdt_enable_slc(mdt);
6882         }
6883
6884         if (!mdt->mdt_lut.lut_dt_conf.ddp_has_lseek_data_hole)
6885                 data->ocd_connect_flags2 &= ~OBD_CONNECT2_LSEEK;
6886
6887         if (!OCD_HAS_FLAG(data, MDS_MDS) && !OCD_HAS_FLAG(data, LIGHTWEIGHT) &&
6888             !OCD_HAS_FLAG2(data, DMV_IMP_INHERIT)) {
6889                 atomic_inc(&mdt->mdt_dmv_old_client_count);
6890                 mdt->mdt_enable_dmv_implicit_inherit = 0;
6891         }
6892
6893         return 0;
6894 }
6895
6896 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
6897                                    struct mdt_thread_info *info,
6898                                    struct mdt_file_data *mfd)
6899 {
6900         struct lu_context ses;
6901         int rc;
6902         ENTRY;
6903
6904         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
6905         if (rc)
6906                 RETURN(rc);
6907
6908         env->le_ses = &ses;
6909         lu_context_enter(&ses);
6910
6911         mdt_ucred(info)->uc_valid = UCRED_OLD;
6912         /* do not let rbac interfere with dirty flag internal system event */
6913         mdt_ucred(info)->uc_rbac_file_perms = 1;
6914         mdt_ucred(info)->uc_rbac_dne_ops = 1;
6915         mdt_ucred(info)->uc_rbac_quota_ops = 1;
6916         mdt_ucred(info)->uc_rbac_byfid_ops = 1;
6917         mdt_ucred(info)->uc_rbac_chlg_ops = 1;
6918         mdt_ucred(info)->uc_rbac_fscrypt_admin = 1;
6919         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
6920
6921         lu_context_exit(&ses);
6922         lu_context_fini(&ses);
6923         env->le_ses = NULL;
6924
6925         RETURN(rc);
6926 }
6927
6928 static int mdt_export_cleanup(struct obd_export *exp)
6929 {
6930         LIST_HEAD(closing_list);
6931         struct mdt_export_data  *med = &exp->exp_mdt_data;
6932         struct obd_device       *obd = exp->exp_obd;
6933         struct mdt_device       *mdt;
6934         struct mdt_thread_info  *info;
6935         struct lu_env            env;
6936         struct mdt_file_data    *mfd, *n;
6937         int rc = 0;
6938         ENTRY;
6939
6940         spin_lock(&med->med_open_lock);
6941         while (!list_empty(&med->med_open_head)) {
6942                 struct list_head *tmp = med->med_open_head.next;
6943                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
6944
6945                 /* Remove mfd handle so it can't be found again.
6946                  * We are consuming the mfd_list reference here. */
6947                 class_handle_unhash(&mfd->mfd_open_handle);
6948                 list_move_tail(&mfd->mfd_list, &closing_list);
6949         }
6950         spin_unlock(&med->med_open_lock);
6951         mdt = mdt_dev(obd->obd_lu_dev);
6952         LASSERT(mdt != NULL);
6953
6954         rc = lu_env_init(&env, LCT_MD_THREAD);
6955         if (rc)
6956                 RETURN(rc);
6957
6958         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6959         LASSERT(info != NULL);
6960         memset(info, 0, sizeof *info);
6961         info->mti_env = &env;
6962         info->mti_mdt = mdt;
6963         info->mti_exp = exp;
6964
6965         if (!list_empty(&closing_list)) {
6966                 struct md_attr *ma = &info->mti_attr;
6967
6968                 /* Close any open files (which may also cause orphan
6969                  * unlinking). */
6970                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
6971                         list_del_init(&mfd->mfd_list);
6972                         ma->ma_need = ma->ma_valid = 0;
6973
6974                         /* This file is being closed due to an eviction, it
6975                          * could have been modified and now dirty regarding to
6976                          * HSM archive, check this!
6977                          * The logic here is to mark a file dirty if there's a
6978                          * chance it was dirtied before the client was evicted,
6979                          * so that we don't have to wait for a release attempt
6980                          * before finding out the file was actually dirty and
6981                          * fail the release. Aggressively marking it dirty here
6982                          * will cause the policy engine to attempt to
6983                          * re-archive it; when rearchiving, we can compare the
6984                          * current version to the HSM data_version and make the
6985                          * archive request into a noop if it's not actually
6986                          * dirty.
6987                          */
6988                         if (mfd->mfd_open_flags & MDS_FMODE_WRITE)
6989                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
6990
6991                         /* Don't unlink orphan on failover umount, LU-184 */
6992                         if (exp->exp_flags & OBD_OPT_FAILOVER ||
6993                             exp->exp_obd->obd_stopping) {
6994                                 ma->ma_valid = MA_FLAGS;
6995                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
6996                         }
6997                         ma->ma_valid |= MA_FORCE_LOG;
6998                         mdt_mfd_close(info, mfd);
6999                 }
7000         }
7001         info->mti_mdt = NULL;
7002         /* cleanup client slot early */
7003         /* Do not erase record for recoverable client. */
7004         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
7005                 tgt_client_del(&env, exp);
7006         lu_env_fini(&env);
7007
7008         RETURN(rc);
7009 }
7010
7011 static int mdt_obd_disconnect(struct obd_export *exp)
7012 {
7013         struct obd_connect_data *data = &exp->exp_connect_data;
7014         struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
7015         int rc;
7016
7017         ENTRY;
7018
7019         LASSERT(exp);
7020         class_export_get(exp);
7021
7022         if (!(exp->exp_flags & OBD_OPT_FORCE))
7023                 tgt_grant_sanity_check(exp->exp_obd, __func__);
7024
7025         if (OCD_HAS_FLAG(data, MDS_MDS) && !OCD_HAS_FLAG(data, LIGHTWEIGHT) &&
7026             atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
7027                 mdt_disable_slc(mdt);
7028
7029         if (!OCD_HAS_FLAG(data, MDS_MDS) && !OCD_HAS_FLAG(data, LIGHTWEIGHT) &&
7030             !OCD_HAS_FLAG2(data, DMV_IMP_INHERIT) &&
7031             atomic_dec_and_test(&mdt->mdt_dmv_old_client_count))
7032                 mdt->mdt_enable_dmv_implicit_inherit = 1;
7033
7034         rc = server_disconnect_export(exp);
7035         if (rc != 0)
7036                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
7037
7038         tgt_grant_discard(exp);
7039
7040         rc = mdt_export_cleanup(exp);
7041         nodemap_del_member(exp);
7042         class_export_put(exp);
7043         RETURN(rc);
7044 }
7045
7046 /* mds_connect copy */
7047 static int mdt_obd_connect(const struct lu_env *env,
7048                            struct obd_export **exp, struct obd_device *obd,
7049                            struct obd_uuid *cluuid,
7050                            struct obd_connect_data *data,
7051                            void *localdata)
7052 {
7053         struct obd_export       *lexp;
7054         struct lustre_handle    conn = { 0 };
7055         struct mdt_device       *mdt;
7056         int                      rc;
7057         struct lnet_nid         *client_nid = localdata;
7058         ENTRY;
7059
7060         LASSERT(env != NULL);
7061         LASSERT(data != NULL);
7062
7063         if (!exp || !obd || !cluuid)
7064                 RETURN(-EINVAL);
7065
7066         mdt = mdt_dev(obd->obd_lu_dev);
7067
7068         /*
7069          * first, check whether the stack is ready to handle requests
7070          * XXX: probably not very appropriate method is used now
7071          *      at some point we should find a better one
7072          */
7073         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
7074             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
7075             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
7076                 rc = obd_get_info(env, mdt->mdt_child_exp,
7077                                   sizeof(KEY_OSP_CONNECTED),
7078                                   KEY_OSP_CONNECTED, NULL, NULL);
7079                 if (rc)
7080                         RETURN(-EAGAIN);
7081                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
7082         }
7083
7084         rc = class_connect(&conn, obd, cluuid);
7085         if (rc)
7086                 RETURN(rc);
7087
7088         lexp = class_conn2export(&conn);
7089         LASSERT(lexp != NULL);
7090
7091         if (nid_is_nid4(client_nid)) {
7092                 rc = nodemap_add_member(lnet_nid_to_nid4(client_nid), lexp);
7093                 if (rc != 0 && rc != -EEXIST)
7094                         GOTO(out, rc);
7095         }
7096
7097         rc = mdt_connect_internal(env, lexp, mdt, data, false);
7098         if (rc == 0) {
7099                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
7100
7101                 LASSERT(lcd);
7102                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
7103                 rc = tgt_client_new(env, lexp);
7104                 if (rc == 0)
7105                         mdt_export_stats_init(obd, lexp, localdata);
7106         }
7107 out:
7108         if (rc != 0) {
7109                 class_disconnect(lexp);
7110                 nodemap_del_member(lexp);
7111                 *exp = NULL;
7112         } else {
7113                 *exp = lexp;
7114                 /* Because we do not want this export to be evicted by pinger,
7115                  * let's not add this export to the timed chain list. */
7116                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
7117                         spin_lock(&lexp->exp_obd->obd_dev_lock);
7118                         list_del_init(&lexp->exp_obd_chain_timed);
7119                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
7120                 }
7121         }
7122
7123         RETURN(rc);
7124 }
7125
7126 static int mdt_obd_reconnect(const struct lu_env *env,
7127                              struct obd_export *exp, struct obd_device *obd,
7128                              struct obd_uuid *cluuid,
7129                              struct obd_connect_data *data,
7130                              void *localdata)
7131 {
7132         struct lnet_nid *client_nid = localdata;
7133         int rc;
7134         ENTRY;
7135
7136         if (exp == NULL || obd == NULL || cluuid == NULL)
7137                 RETURN(-EINVAL);
7138
7139         if (nid_is_nid4(client_nid)) {
7140                 rc = nodemap_add_member(lnet_nid_to_nid4(client_nid), exp);
7141                 if (rc != 0 && rc != -EEXIST)
7142                         RETURN(rc);
7143         }
7144
7145         rc = mdt_connect_internal(env, exp, mdt_dev(obd->obd_lu_dev), data,
7146                                   true);
7147         if (rc == 0)
7148                 mdt_export_stats_init(obd, exp, localdata);
7149         else
7150                 nodemap_del_member(exp);
7151
7152         RETURN(rc);
7153 }
7154
7155 /* FIXME: Can we avoid using these two interfaces? */
7156 static int mdt_init_export(struct obd_export *exp)
7157 {
7158         struct mdt_export_data *med = &exp->exp_mdt_data;
7159         int                     rc;
7160         ENTRY;
7161
7162         INIT_LIST_HEAD(&med->med_open_head);
7163         spin_lock_init(&med->med_open_lock);
7164         spin_lock(&exp->exp_lock);
7165         exp->exp_connecting = 1;
7166         spin_unlock(&exp->exp_lock);
7167
7168         OBD_ALLOC(exp->exp_used_slots,
7169                   BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
7170         if (exp->exp_used_slots == NULL)
7171                 RETURN(-ENOMEM);
7172
7173         /* self-export doesn't need client data and ldlm initialization */
7174         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
7175                                      &exp->exp_client_uuid)))
7176                 RETURN(0);
7177
7178         rc = tgt_client_alloc(exp);
7179         if (rc)
7180                 GOTO(err, rc);
7181
7182         rc = ldlm_init_export(exp);
7183         if (rc)
7184                 GOTO(err_free, rc);
7185
7186         RETURN(rc);
7187
7188 err_free:
7189         tgt_client_free(exp);
7190 err:
7191         OBD_FREE(exp->exp_used_slots,
7192                  BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
7193         exp->exp_used_slots = NULL;
7194
7195         CERROR("%s: Failed to initialize export: rc = %d\n",
7196                exp->exp_obd->obd_name, rc);
7197         return rc;
7198 }
7199
7200 static int mdt_destroy_export(struct obd_export *exp)
7201 {
7202         ENTRY;
7203
7204         target_destroy_export(exp);
7205         if (exp->exp_used_slots)
7206                 OBD_FREE(exp->exp_used_slots,
7207                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
7208
7209         /* destroy can be called from failed obd_setup, so
7210          * checking uuid is safer than obd_self_export */
7211         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
7212                                      &exp->exp_client_uuid)))
7213                 RETURN(0);
7214
7215         ldlm_destroy_export(exp);
7216         tgt_client_free(exp);
7217
7218         LASSERT(list_empty(&exp->exp_outstanding_replies));
7219         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
7220
7221         /*
7222          * discard grants once we're sure no more
7223          * interaction with the client is possible
7224          */
7225         tgt_grant_discard(exp);
7226         if (exp_connect_flags(exp) & OBD_CONNECT_GRANT)
7227                 obd2obt(exp->exp_obd)->obt_lut->lut_tgd.tgd_tot_granted_clients--;
7228
7229         if (!(exp->exp_flags & OBD_OPT_FORCE))
7230                 tgt_grant_sanity_check(exp->exp_obd, __func__);
7231
7232         RETURN(0);
7233 }
7234
7235 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
7236                    struct linkea_data *ldata)
7237 {
7238         int rc;
7239
7240         LASSERT(ldata->ld_buf->lb_buf != NULL);
7241
7242         if (!mdt_object_exists(mdt_obj))
7243                 return -ENODATA;
7244
7245         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
7246                           ldata->ld_buf, XATTR_NAME_LINK);
7247         if (rc == -ERANGE) {
7248                 /* Buf was too small, figure out what we need. */
7249                 lu_buf_free(ldata->ld_buf);
7250                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
7251                                   ldata->ld_buf, XATTR_NAME_LINK);
7252                 if (rc < 0)
7253                         return rc;
7254                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
7255                 if (ldata->ld_buf->lb_buf == NULL)
7256                         return -ENOMEM;
7257                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
7258                                   ldata->ld_buf, XATTR_NAME_LINK);
7259         }
7260         if (rc < 0)
7261                 return rc;
7262
7263         return linkea_init_with_rec(ldata);
7264 }
7265
7266 /**
7267  * Given an MDT object, try to look up the full path to the object.
7268  * Part of the MDT layer implementation of lfs fid2path.
7269  *
7270  * \param[in]     info  Per-thread common data shared by MDT level handlers.
7271  * \param[in]     obj   Object to do path lookup of
7272  * \param[in,out] fp    User-provided struct to store path information
7273  * \param[in]     root_fid Root FID of current path should reach
7274  *
7275  * \retval 0 Lookup successful, path information stored in fp
7276  * \retval -EAGAIN Lookup failed, usually because object is being moved
7277  * \retval negative errno if there was a problem
7278  */
7279 static int mdt_path_current(struct mdt_thread_info *info,
7280                             struct mdt_object *obj,
7281                             struct getinfo_fid2path *fp,
7282                             struct lu_fid *root_fid)
7283 {
7284         struct mdt_device *mdt = info->mti_mdt;
7285         struct lu_name *tmpname = &info->mti_name;
7286         struct lu_fid *tmpfid = &info->mti_tmp_fid1;
7287         struct lu_buf *buf = &info->mti_big_buf;
7288         struct linkea_data ldata = { NULL };
7289         bool first = true;
7290         struct mdt_object *mdt_obj;
7291         struct link_ea_header *leh;
7292         struct link_ea_entry *lee;
7293         bool worthchecking = true;
7294         bool needsfid = false;
7295         bool supported = false;
7296         int isenc = -1;
7297         char *ptr;
7298         int reclen;
7299         int rc = 0;
7300
7301         ENTRY;
7302
7303         /* temp buffer for path element, the buffer will be finally freed
7304          * in mdt_thread_info_fini */
7305         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
7306         if (buf->lb_buf == NULL)
7307                 RETURN(-ENOMEM);
7308
7309         ldata.ld_buf = buf;
7310         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
7311         *ptr = 0;
7312         --ptr;
7313         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
7314
7315         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
7316                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
7317                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
7318                         GOTO(out, rc = -ENOENT);
7319
7320                 if (lu_fid_eq(mdt_object_fid(obj), tmpfid)) {
7321                         mdt_obj = obj;
7322                         mdt_object_get(info->mti_env, mdt_obj);
7323                 } else {
7324                         mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
7325                         if (IS_ERR(mdt_obj))
7326                                 GOTO(out, rc = PTR_ERR(mdt_obj));
7327                 }
7328
7329                 if (!mdt_object_exists(mdt_obj)) {
7330                         mdt_object_put(info->mti_env, mdt_obj);
7331                         GOTO(out, rc = -ENOENT);
7332                 }
7333
7334                 if (mdt_object_remote(mdt_obj)) {
7335                         mdt_object_put(info->mti_env, mdt_obj);
7336                         GOTO(remote_out, rc = -EREMOTE);
7337                 }
7338
7339                 if (worthchecking) {
7340                         /* we need to know if the FID being
7341                          * looked up is encrypted
7342                          */
7343                         struct lu_attr la = { 0 };
7344                         struct dt_object *dt = mdt_obj2dt(mdt_obj);
7345
7346                         if (dt && dt->do_ops && dt->do_ops->do_attr_get)
7347                                 dt_attr_get(info->mti_env, dt, &la);
7348                         if (la.la_valid & LA_FLAGS &&
7349                             la.la_flags & LUSTRE_ENCRYPT_FL) {
7350                                 if (!supported && mdt_info_req(info) &&
7351                                     !exp_connect_encrypt_fid2path(
7352                                             mdt_info_req(info)->rq_export)) {
7353                                         /* client does not support fid2path
7354                                          * for encrypted files
7355                                          */
7356                                         mdt_object_put(info->mti_env, mdt_obj);
7357                                         GOTO(out, rc = -ENODATA);
7358                                 } else {
7359                                         supported = true;
7360                                 }
7361                                 needsfid = true;
7362                                 if (isenc == -1)
7363                                         isenc = 1;
7364                         } else {
7365                                 worthchecking = false;
7366                                 needsfid = false;
7367                                 if (isenc == -1)
7368                                         isenc = 0;
7369                         }
7370                 }
7371
7372                 rc = mdt_links_read(info, mdt_obj, &ldata);
7373                 if (rc != 0) {
7374                         mdt_object_put(info->mti_env, mdt_obj);
7375                         GOTO(out, rc);
7376                 }
7377
7378                 leh = buf->lb_buf;
7379                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
7380                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
7381                 /* If set, use link #linkno for path lookup, otherwise use
7382                    link #0.  Only do this for the final path element. */
7383                 if (first && fp->gf_linkno < leh->leh_reccount) {
7384                         int count;
7385                         for (count = 0; count < fp->gf_linkno; count++) {
7386                                 lee = (struct link_ea_entry *)
7387                                      ((char *)lee + reclen);
7388                                 linkea_entry_unpack(lee, &reclen, tmpname,
7389                                                     tmpfid);
7390                         }
7391                         if (fp->gf_linkno < leh->leh_reccount - 1)
7392                                 /* indicate to user there are more links */
7393                                 fp->gf_linkno++;
7394                 }
7395
7396                 /* Check if it is slave stripes */
7397                 rc = mdt_is_dir_stripe(info, mdt_obj);
7398                 mdt_object_put(info->mti_env, mdt_obj);
7399                 if (rc < 0)
7400                         GOTO(out, rc);
7401                 if (rc == 1) {
7402                         fp->gf_fid = *tmpfid;
7403                         continue;
7404                 }
7405
7406                 /* Pack the name in the end of the buffer */
7407                 ptr -= tmpname->ln_namelen;
7408                 if (ptr - 1 <= fp->gf_u.gf_path)
7409                         GOTO(out, rc = -ENAMETOOLONG);
7410                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
7411                 if (needsfid) {
7412                         /* Pack FID before file name, so that client can build
7413                          * encoded/digested form.
7414                          */
7415                         char fidstr[FID_LEN + 1];
7416
7417                         snprintf(fidstr, sizeof(fidstr), DFID,
7418                                  PFID(&fp->gf_fid));
7419                         ptr -= strlen(fidstr);
7420                         if (ptr - 1 <= fp->gf_u.gf_path)
7421                                 GOTO(out, rc = -ENAMETOOLONG);
7422                         strncpy(ptr, fidstr, strlen(fidstr));
7423                 }
7424                 *(--ptr) = '/';
7425
7426                 /* keep the last resolved fid to the client, so the
7427                  * client will build the left path on another MDT for
7428                  * remote object */
7429                 fp->gf_fid = *tmpfid;
7430
7431                 first = false;
7432         }
7433
7434         /* non-zero will be treated as an error */
7435         rc = 0;
7436
7437 remote_out:
7438         if (isenc != 1)
7439                 ptr++; /* skip leading / unless this is an encrypted file */
7440         memmove(fp->gf_u.gf_path, ptr,
7441                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
7442
7443 out:
7444         RETURN(rc);
7445 }
7446
7447 /**
7448  * Given an MDT object, use mdt_path_current to get the path.
7449  * Essentially a wrapper to retry mdt_path_current a set number of times
7450  * if -EAGAIN is returned (usually because an object is being moved).
7451  *
7452  * Part of the MDT layer implementation of lfs fid2path.
7453  *
7454  * \param[in]     info  Per-thread common data shared by mdt level handlers.
7455  * \param[in]     obj   Object to do path lookup of
7456  * \param[in,out] fp    User-provided struct for arguments and to store path
7457  *                      information
7458  *
7459  * \retval 0 Lookup successful, path information stored in fp
7460  * \retval negative errno if there was a problem
7461  */
7462 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
7463                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
7464 {
7465         struct mdt_device       *mdt = info->mti_mdt;
7466         int                     tries = 3;
7467         int                     rc = -EAGAIN;
7468         ENTRY;
7469
7470         if (fp->gf_pathlen < 3)
7471                 RETURN(-EOVERFLOW);
7472
7473         if (root_fid == NULL)
7474                 root_fid = &mdt->mdt_md_root_fid;
7475
7476         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
7477                 fp->gf_u.gf_path[0] = '\0';
7478                 RETURN(0);
7479         }
7480
7481         /* Retry multiple times in case file is being moved */
7482         while (tries-- && rc == -EAGAIN)
7483                 rc = mdt_path_current(info, obj, fp, root_fid);
7484
7485         RETURN(rc);
7486 }
7487
7488 /**
7489  * Get the full path of the provided FID, as of changelog record recno.
7490  *
7491  * This checks sanity and looks up object for user provided FID
7492  * before calling the actual path lookup code.
7493  *
7494  * Part of the MDT layer implementation of lfs fid2path.
7495  *
7496  * \param[in]     info  Per-thread common data shared by mdt level handlers.
7497  * \param[in,out] fp    User-provided struct for arguments and to store path
7498  *                      information
7499  *
7500  * \retval 0 Lookup successful, path information and recno stored in fp
7501  * \retval -ENOENT, object does not exist
7502  * \retval negative errno if there was a problem
7503  */
7504 static int mdt_fid2path(struct mdt_thread_info *info,
7505                         struct lu_fid *root_fid,
7506                         struct getinfo_fid2path *fp)
7507 {
7508         struct mdt_device *mdt = info->mti_mdt;
7509         struct mdt_object *obj;
7510         int    rc;
7511         ENTRY;
7512
7513         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
7514                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
7515
7516         if (!fid_is_sane(&fp->gf_fid))
7517                 RETURN(-EINVAL);
7518
7519         if (!fid_is_namespace_visible(&fp->gf_fid)) {
7520                 CDEBUG(D_INFO, "%s: "DFID" is invalid, f_seq should be >= %#llx"
7521                        ", or f_oid != 0, or f_ver == 0\n", mdt_obd_name(mdt),
7522                        PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
7523                 RETURN(-EINVAL);
7524         }
7525
7526         /* return error if client-provided root fid
7527          * is not the one stored in the export
7528          */
7529         if (root_fid && !fid_is_zero(&info->mti_exp->exp_root_fid) &&
7530             !lu_fid_eq(root_fid, &info->mti_exp->exp_root_fid)) {
7531                 CDEBUG(D_INFO,
7532                        "%s: root fid from client "DFID" but "DFID" stored in export\n",
7533                        mdt_obd_name(mdt), PFID(root_fid),
7534                        PFID(&info->mti_exp->exp_root_fid));
7535                 RETURN(-EXDEV);
7536         }
7537
7538         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
7539         if (IS_ERR(obj)) {
7540                 rc = PTR_ERR(obj);
7541                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
7542                        PFID(&fp->gf_fid), rc);
7543                 RETURN(rc);
7544         }
7545
7546         if (mdt_object_remote(obj))
7547                 rc = -EREMOTE;
7548         else if (!mdt_object_exists(obj))
7549                 rc = -ENOENT;
7550         else
7551                 rc = 0;
7552
7553         if (rc < 0) {
7554                 mdt_object_put(info->mti_env, obj);
7555                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
7556                        PFID(&fp->gf_fid), rc);
7557                 RETURN(rc);
7558         }
7559
7560         rc = mdt_path(info, obj, fp, root_fid);
7561
7562         CDEBUG(D_INFO, "fid "DFID", path %s recno %#llx linkno %u\n",
7563                PFID(&fp->gf_fid), fp->gf_u.gf_path,
7564                fp->gf_recno, fp->gf_linkno);
7565
7566         mdt_object_put(info->mti_env, obj);
7567
7568         RETURN(rc);
7569 }
7570
7571 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
7572                             void *val, int vallen)
7573 {
7574         struct getinfo_fid2path *fpout, *fpin;
7575         struct lu_fid *root_fid = NULL;
7576         int rc = 0;
7577
7578         fpin = key + round_up(sizeof(KEY_FID2PATH), 8);
7579         fpout = val;
7580
7581         if (req_capsule_req_need_swab(info->mti_pill))
7582                 lustre_swab_fid2path(fpin);
7583
7584         memcpy(fpout, fpin, sizeof(*fpin));
7585         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
7586                 RETURN(-EINVAL);
7587
7588         if (keylen >= round_up(sizeof(KEY_FID2PATH), 8) + sizeof(*fpin) +
7589                       sizeof(struct lu_fid)) {
7590                 /* client sent its root FID, which is normally fileset FID */
7591                 root_fid = fpin->gf_u.gf_root_fid;
7592                 if (req_capsule_req_need_swab(info->mti_pill))
7593                         lustre_swab_lu_fid(root_fid);
7594
7595                 if (root_fid != NULL && !fid_is_sane(root_fid))
7596                         RETURN(-EINVAL);
7597         }
7598
7599         rc = mdt_fid2path(info, root_fid, fpout);
7600         RETURN(rc);
7601 }
7602
7603 int mdt_get_info(struct tgt_session_info *tsi)
7604 {
7605         char    *key;
7606         int      keylen;
7607         __u32   *vallen;
7608         void    *valout;
7609         int      rc;
7610
7611         ENTRY;
7612
7613         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
7614         if (key == NULL) {
7615                 CDEBUG(D_IOCTL, "No GETINFO key\n");
7616                 RETURN(err_serious(-EFAULT));
7617         }
7618         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
7619                                       RCL_CLIENT);
7620
7621         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
7622         if (vallen == NULL) {
7623                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
7624                                 tgt_name(tsi->tsi_tgt));
7625                 RETURN(err_serious(-EFAULT));
7626         }
7627
7628         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
7629                              *vallen);
7630         rc = req_capsule_server_pack(tsi->tsi_pill);
7631         if (rc)
7632                 RETURN(err_serious(rc));
7633
7634         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
7635         if (valout == NULL) {
7636                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
7637                                 tgt_name(tsi->tsi_tgt));
7638                 RETURN(err_serious(-EFAULT));
7639         }
7640
7641         if (KEY_IS(KEY_FID2PATH)) {
7642                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
7643
7644                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
7645                 mdt_thread_info_fini(info);
7646         } else {
7647                 rc = -EINVAL;
7648         }
7649         RETURN(rc);
7650 }
7651
7652 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
7653 {
7654         struct obd_ioctl_data *data = karg;
7655         struct lu_fid *fid;
7656         __u64 version;
7657         struct mdt_object *obj;
7658         struct mdt_lock_handle  *lh;
7659         int rc;
7660         ENTRY;
7661
7662         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
7663             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
7664                 RETURN(-EINVAL);
7665
7666         fid = (struct lu_fid *)data->ioc_inlbuf1;
7667
7668         if (!fid_is_sane(fid))
7669                 RETURN(-EINVAL);
7670
7671         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
7672
7673         lh = &mti->mti_lh[MDT_LH_PARENT];
7674         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE, LCK_CR);
7675         if (IS_ERR(obj))
7676                 RETURN(PTR_ERR(obj));
7677
7678         if (mdt_object_remote(obj)) {
7679                 rc = -EREMOTE;
7680                 /**
7681                  * before calling version get the correct MDS should be
7682                  * fid, this is error to find remote object here
7683                  */
7684                 CERROR("nonlocal object "DFID"\n", PFID(fid));
7685         } else if (!mdt_object_exists(obj)) {
7686                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
7687                 rc = -ENOENT;
7688         } else {
7689                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
7690                *(__u64 *)data->ioc_inlbuf2 = version;
7691                 rc = 0;
7692         }
7693         mdt_object_unlock_put(mti, obj, lh, 1);
7694         RETURN(rc);
7695 }
7696
7697 /* ioctls on obd dev */
7698 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
7699                          void *karg, void __user *uarg)
7700 {
7701         struct obd_device *obd = exp->exp_obd;
7702         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
7703         struct dt_device *dt = mdt->mdt_bottom;
7704         struct obd_ioctl_data *data;
7705         struct lu_env env;
7706         int rc;
7707
7708         ENTRY;
7709         CDEBUG(D_IOCTL, "%s: cmd=%x len=%u karg=%pK uarg=%pK\n",
7710                obd->obd_name, cmd, len, karg, uarg);
7711
7712         rc = lu_env_init(&env, LCT_MD_THREAD);
7713         if (rc)
7714                 RETURN(rc);
7715
7716         /* handle commands that don't use @karg first */
7717         switch (cmd) {
7718         case OBD_IOC_SYNC:
7719                 rc = mdt_device_sync(&env, mdt);
7720                 GOTO(out, rc);
7721         case OBD_IOC_SET_READONLY:
7722                 rc = dt_sync(&env, dt);
7723                 if (rc == 0)
7724                         rc = dt_ro(&env, dt);
7725                 GOTO(out, rc);
7726         }
7727
7728         if (unlikely(karg == NULL)) {
7729                 OBD_IOC_ERROR(obd->obd_name, cmd, "karg=NULL", rc = -EINVAL);
7730                 GOTO(out, rc);
7731         }
7732         data = karg;
7733
7734         switch (cmd) {
7735         case OBD_IOC_ABORT_RECOVERY: {
7736                 if (data->ioc_type & OBD_FLG_ABORT_RECOV_MDT) {
7737                         LCONSOLE_WARN("%s: Aborting MDT recovery\n",
7738                                       obd->obd_name);
7739                         obd->obd_abort_mdt_recovery = 1;
7740                         wake_up(&obd->obd_next_transno_waitq);
7741                 } else { /* if (data->ioc_type & OBD_FLG_ABORT_RECOV_OST) */
7742                         /* lctl didn't set OBD_FLG_ABORT_RECOV_OST < 2.13.57 */
7743                         LCONSOLE_WARN("%s: Aborting client recovery\n",
7744                                       obd->obd_name);
7745                         obd->obd_abort_recovery = 1;
7746                         target_stop_recovery_thread(obd);
7747                 }
7748                 rc = 0;
7749                 break;
7750         }
7751         case OBD_IOC_CHANGELOG_REG:
7752         case OBD_IOC_CHANGELOG_DEREG:
7753         case OBD_IOC_CHANGELOG_CLEAR:
7754         case OBD_IOC_LLOG_PRINT:
7755         case OBD_IOC_LLOG_CANCEL:
7756                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(&env, mdt->mdt_child,
7757                                                            cmd, len, karg);
7758                 break;
7759         case OBD_IOC_START_LFSCK: {
7760                 struct md_device *next = mdt->mdt_child;
7761                 struct lfsck_start_param lsp;
7762
7763                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
7764                 lsp.lsp_index_valid = 0;
7765                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
7766                 break;
7767         }
7768         case OBD_IOC_STOP_LFSCK: {
7769                 struct md_device *next = mdt->mdt_child;
7770                 struct lfsck_stop stop;
7771
7772                 stop.ls_status = LS_STOPPED;
7773                 /* Old lfsck utils may pass NULL @stop. */
7774                 if (data->ioc_inlbuf1 == NULL)
7775                         stop.ls_flags = 0;
7776                 else
7777                         stop.ls_flags =
7778                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
7779
7780                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
7781                 break;
7782         }
7783         case OBD_IOC_QUERY_LFSCK: {
7784                 struct md_device *next = mdt->mdt_child;
7785
7786                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
7787                                                  data->ioc_inlbuf1);
7788                 break;
7789         }
7790         case OBD_IOC_GET_OBJ_VERSION: {
7791                 struct mdt_thread_info *mti;
7792
7793                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
7794                 memset(mti, 0, sizeof(*mti));
7795                 mti->mti_env = &env;
7796                 mti->mti_mdt = mdt;
7797                 mti->mti_exp = exp;
7798
7799                 rc = mdt_ioc_version_get(mti, karg);
7800                 break;
7801         }
7802         case OBD_IOC_CATLOGLIST: {
7803                 struct mdt_thread_info *mti;
7804
7805                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
7806                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
7807                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
7808                                        &mti->mti_tmp_fid1);
7809                 break;
7810         }
7811         default:
7812                 rc = OBD_IOC_ERROR(obd->obd_name, cmd, "unrecognized", -ENOTTY);
7813                 break;
7814         }
7815 out:
7816         lu_env_fini(&env);
7817         RETURN(rc);
7818 }
7819
7820 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
7821 {
7822         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
7823         int rc;
7824         ENTRY;
7825
7826         if (!mdt->mdt_skip_lfsck && !mdt->mdt_bottom->dd_rdonly) {
7827                 struct lfsck_start_param lsp;
7828
7829                 lsp.lsp_start = NULL;
7830                 lsp.lsp_index_valid = 0;
7831                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
7832                                                            OBD_IOC_START_LFSCK,
7833                                                            0, &lsp);
7834                 if (rc != 0 && rc != -EALREADY)
7835                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
7836                               mdt_obd_name(mdt), rc);
7837         }
7838
7839         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
7840         RETURN(rc);
7841 }
7842
7843 static int mdt_obd_postrecov(struct obd_device *obd)
7844 {
7845         struct lu_env env;
7846         int rc;
7847
7848         rc = lu_env_init(&env, LCT_MD_THREAD);
7849         if (rc)
7850                 RETURN(rc);
7851         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
7852         lu_env_fini(&env);
7853         return rc;
7854 }
7855
7856 static const struct obd_ops mdt_obd_device_ops = {
7857         .o_owner          = THIS_MODULE,
7858         .o_set_info_async = mdt_obd_set_info_async,
7859         .o_connect        = mdt_obd_connect,
7860         .o_reconnect      = mdt_obd_reconnect,
7861         .o_disconnect     = mdt_obd_disconnect,
7862         .o_init_export    = mdt_init_export,
7863         .o_destroy_export = mdt_destroy_export,
7864         .o_iocontrol      = mdt_iocontrol,
7865         .o_postrecov      = mdt_obd_postrecov,
7866         /* Data-on-MDT IO methods */
7867         .o_preprw         = mdt_obd_preprw,
7868         .o_commitrw       = mdt_obd_commitrw,
7869 };
7870
7871 static struct lu_device* mdt_device_fini(const struct lu_env *env,
7872                                          struct lu_device *d)
7873 {
7874         struct mdt_device *m = mdt_dev(d);
7875         ENTRY;
7876
7877         mdt_fini(env, m);
7878         RETURN(NULL);
7879 }
7880
7881 static struct lu_device *mdt_device_free(const struct lu_env *env,
7882                                          struct lu_device *d)
7883 {
7884         struct mdt_device *m = mdt_dev(d);
7885         ENTRY;
7886
7887         lu_device_fini(&m->mdt_lu_dev);
7888         OBD_FREE_PTR(m);
7889
7890         RETURN(NULL);
7891 }
7892
7893 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
7894                                           struct lu_device_type *t,
7895                                           struct lustre_cfg *cfg)
7896 {
7897         struct lu_device  *l;
7898         struct mdt_device *m;
7899
7900         OBD_ALLOC_PTR(m);
7901         if (m != NULL) {
7902                 int rc;
7903
7904                 l = &m->mdt_lu_dev;
7905                 rc = mdt_init0(env, m, t, cfg);
7906                 if (rc != 0) {
7907                         mdt_device_free(env, l);
7908                         l = ERR_PTR(rc);
7909                         return l;
7910                 }
7911         } else
7912                 l = ERR_PTR(-ENOMEM);
7913         return l;
7914 }
7915
7916 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
7917 LU_KEY_INIT(mdt, struct mdt_thread_info);
7918
7919 static void mdt_key_fini(const struct lu_context *ctx,
7920                          struct lu_context_key *key, void* data)
7921 {
7922         struct mdt_thread_info *info = data;
7923
7924         if (info->mti_big_lmm) {
7925                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
7926                 info->mti_big_lmm = NULL;
7927                 info->mti_big_lmmsize = 0;
7928         }
7929
7930         if (info->mti_big_acl) {
7931                 OBD_FREE_LARGE(info->mti_big_acl, info->mti_big_aclsize);
7932                 info->mti_big_acl = NULL;
7933                 info->mti_big_aclsize = 0;
7934         }
7935
7936         OBD_FREE_PTR(info);
7937 }
7938
7939 /* context key: mdt_thread_key */
7940 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
7941
7942 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
7943 {
7944         return lu_ucred(info->mti_env);
7945 }
7946
7947 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
7948 {
7949         return lu_ucred_check(info->mti_env);
7950 }
7951
7952 /**
7953  * Enable/disable COS (Commit On Sharing).
7954  *
7955  * Set/Clear the COS flag in mdt options.
7956  *
7957  * \param mdt mdt device
7958  * \param val 0 disables COS, other values enable COS
7959  */
7960 void mdt_enable_cos(struct mdt_device *mdt, bool val)
7961 {
7962         struct lu_env env;
7963         int rc;
7964
7965         mdt->mdt_opts.mo_cos = val;
7966         rc = lu_env_init(&env, LCT_LOCAL);
7967         if (unlikely(rc != 0)) {
7968                 CWARN("%s: lu_env initialization failed, cannot "
7969                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
7970                 return;
7971         }
7972         mdt_device_sync(&env, mdt);
7973         lu_env_fini(&env);
7974 }
7975
7976 /**
7977  * Check COS (Commit On Sharing) status.
7978  *
7979  * Return COS flag status.
7980  *
7981  * \param mdt mdt device
7982  */
7983 int mdt_cos_is_enabled(struct mdt_device *mdt)
7984 {
7985         return mdt->mdt_opts.mo_cos != 0;
7986 }
7987
7988 static const struct lu_device_type_operations mdt_device_type_ops = {
7989         .ldto_device_alloc = mdt_device_alloc,
7990         .ldto_device_free  = mdt_device_free,
7991         .ldto_device_fini  = mdt_device_fini
7992 };
7993
7994 static struct lu_device_type mdt_device_type = {
7995         .ldt_tags     = LU_DEVICE_MD,
7996         .ldt_name     = LUSTRE_MDT_NAME,
7997         .ldt_ops      = &mdt_device_type_ops,
7998         .ldt_ctx_tags = LCT_MD_THREAD
7999 };
8000
8001 static int __init mdt_init(void)
8002 {
8003         int rc;
8004
8005         BUILD_BUG_ON(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") !=
8006                      FID_NOBRACE_LEN + 1);
8007         BUILD_BUG_ON(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") !=
8008                      FID_LEN + 1);
8009
8010         rc = libcfs_setup();
8011         if (rc)
8012                 return rc;
8013
8014         rc = lu_kmem_init(mdt_caches);
8015         if (rc)
8016                 return rc;
8017
8018         rc = mds_mod_init();
8019         if (rc)
8020                 GOTO(lu_fini, rc);
8021
8022         rc = class_register_type(&mdt_obd_device_ops, NULL, true,
8023                                  LUSTRE_MDT_NAME, &mdt_device_type);
8024         if (rc)
8025                 GOTO(mds_fini, rc);
8026 lu_fini:
8027         if (rc)
8028                 lu_kmem_fini(mdt_caches);
8029 mds_fini:
8030         if (rc)
8031                 mds_mod_exit();
8032         return rc;
8033 }
8034
8035 static void __exit mdt_exit(void)
8036 {
8037         class_unregister_type(LUSTRE_MDT_NAME);
8038         mds_mod_exit();
8039         lu_kmem_fini(mdt_caches);
8040 }
8041
8042 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
8043 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
8044 MODULE_VERSION(LUSTRE_VERSION_STRING);
8045 MODULE_LICENSE("GPL");
8046
8047 module_init(mdt_init);
8048 module_exit(mdt_exit);