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