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