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  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/mdt/mdt_handler.c
  33  *
  34  * Lustre Metadata Target (mdt) request handler
  35  *
  36  * Author: Peter Braam <braam@clusterfs.com>
  37  * Author: Andreas Dilger <adilger@clusterfs.com>
  38  * Author: Phil Schwan <phil@clusterfs.com>
  39  * Author: Mike Shaver <shaver@clusterfs.com>
  40  * Author: Nikita Danilov <nikita@clusterfs.com>
  41  * Author: Huang Hua <huanghua@clusterfs.com>
  42  * Author: Yury Umanets <umka@clusterfs.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_MDS
  46
  47 #include <linux/module.h>
  48 #include <linux/pagemap.h>
  49
  50 #include <dt_object.h>
  51 #include <lustre_acl.h>
  52 #include <lustre_export.h>
  53 #include <uapi/linux/lustre/lustre_ioctl.h>
  54 #include <lustre_lfsck.h>
  55 #include <lustre_log.h>
  56 #include <lustre_nodemap.h>
  57 #include <lustre_mds.h>
  58 #include <uapi/linux/lustre/lustre_param.h>
  59 #include <lustre_quota.h>
  60 #include <lustre_swab.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_lock_pdo_init(struct mdt_lock_handle *lh, enum ldlm_mode lock_mode,
 167                        const struct lu_name *lname)
 168 {
 169         lh->mlh_reg_mode = lock_mode;
 170         lh->mlh_pdo_mode = LCK_MINMODE;
 171         lh->mlh_rreg_mode = lock_mode;
 172         lh->mlh_type = MDT_PDO_LOCK;
 173
 174         if (lu_name_is_valid(lname)) {
 175                 lh->mlh_pdo_hash = ll_full_name_hash(NULL, lname->ln_name,
 176                                                      lname->ln_namelen);
 177                 /* XXX Workaround for LU-2856
 178                  *
 179                  * Zero is a valid return value of full_name_hash, but
 180                  * several users of mlh_pdo_hash assume a non-zero
 181                  * hash value. We therefore map zero onto an
 182                  * arbitrary, but consistent value (1) to avoid
 183                  * problems further down the road. */
 184                 if (unlikely(lh->mlh_pdo_hash == 0))
 185                         lh->mlh_pdo_hash = 1;
 186         } else {
 187                 lh->mlh_pdo_hash = 0;
 188         }
 189 }
 190
 191 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 192                               struct mdt_lock_handle *lh)
 193 {
 194         mdl_mode_t mode;
 195         ENTRY;
 196
 197         /*
 198          * Any dir access needs couple of locks:
 199          *
 200          * 1) on part of dir we gonna take lookup/modify;
 201          *
 202          * 2) on whole dir to protect it from concurrent splitting and/or to
 203          * flush client's cache for readdir().
 204          *
 205          * so, for a given mode and object this routine decides what lock mode
 206          * to use for lock #2:
 207          *
 208          * 1) if caller's gonna lookup in dir then we need to protect dir from
 209          * being splitted only - LCK_CR
 210          *
 211          * 2) if caller's gonna modify dir then we need to protect dir from
 212          * being splitted and to flush cache - LCK_CW
 213          *
 214          * 3) if caller's gonna modify dir and that dir seems ready for
 215          * splitting then we need to protect it from any type of access
 216          * (lookup/modify/split) - LCK_EX --bzzz
 217          */
 218
 219         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 220         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 221
 222         /*
 223          * Ask underlaying level its opinion about preferable PDO lock mode
 224          * having access type passed as regular lock mode:
 225          *
 226          * - MDL_MINMODE means that lower layer does not want to specify lock
 227          * mode;
 228          *
 229          * - MDL_NL means that no PDO lock should be taken. This is used in some
 230          * cases. Say, for non-splittable directories no need to use PDO locks
 231          * at all.
 232          */
 233         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 234                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 235
 236         if (mode != MDL_MINMODE) {
 237                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 238         } else {
 239                 /*
 240                  * Lower layer does not want to specify locking mode. We do it
 241                  * our selves. No special protection is needed, just flush
 242                  * client's cache on modification and allow concurrent
 243                  * mondification.
 244                  */
 245                 switch (lh->mlh_reg_mode) {
 246                 case LCK_EX:
 247                         lh->mlh_pdo_mode = LCK_EX;
 248                         break;
 249                 case LCK_PR:
 250                         lh->mlh_pdo_mode = LCK_CR;
 251                         break;
 252                 case LCK_PW:
 253                         lh->mlh_pdo_mode = LCK_CW;
 254                         break;
 255                 default:
 256                         CERROR("Not expected lock type (0x%x)\n",
 257                                (int)lh->mlh_reg_mode);
 258                         LBUG();
 259                 }
 260         }
 261
 262         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 263         EXIT;
 264 }
 265
 266 static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 267                               struct lu_fid *fid)
 268 {
 269         struct mdt_device *mdt = info->mti_mdt;
 270         struct lu_name *lname = &info->mti_name;
 271         char *filename = info->mti_filename;
 272         struct mdt_object *parent;
 273         u32 mode;
 274         int rc = 0;
 275
 276         LASSERT(!info->mti_cross_ref);
 277
 278         /*
 279          * We may want to allow this to mount a completely separate
 280          * fileset from the MDT in the future, but keeping it to
 281          * ROOT/ only for now avoid potential security issues.
 282          */
 283         *fid = mdt->mdt_md_root_fid;
 284
 285         while (rc == 0 && fileset != NULL && *fileset != '\0') {
 286                 const char *s1 = fileset;
 287                 const char *s2;
 288
 289                 while (*++s1 == '/')
 290                         ;
 291                 s2 = s1;
 292                 while (*s2 != '/' && *s2 != '\0')
 293                         s2++;
 294
 295                 if (s2 == s1)
 296                         break;
 297
 298                 fileset = s2;
 299
 300                 lname->ln_namelen = s2 - s1;
 301                 if (lname->ln_namelen > NAME_MAX) {
 302                         rc = -EINVAL;
 303                         break;
 304                 }
 305
 306                 /* reject .. as a path component */
 307                 if (lname->ln_namelen == 2 &&
 308                     strncmp(s1, "..", 2) == 0) {
 309                         rc = -EINVAL;
 310                         break;
 311                 }
 312
 313                 strncpy(filename, s1, lname->ln_namelen);
 314                 filename[lname->ln_namelen] = '\0';
 315                 lname->ln_name = filename;
 316
 317                 parent = mdt_object_find(info->mti_env, mdt, fid);
 318                 if (IS_ERR(parent)) {
 319                         rc = PTR_ERR(parent);
 320                         break;
 321                 }
 322                 /* Only got the fid of this obj by name */
 323                 fid_zero(fid);
 324                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
 325                                 fid, &info->mti_spec);
 326                 mdt_object_put(info->mti_env, parent);
 327         }
 328         if (!rc) {
 329                 parent = mdt_object_find(info->mti_env, mdt, fid);
 330                 if (IS_ERR(parent))
 331                         rc = PTR_ERR(parent);
 332                 else {
 333                         mode = lu_object_attr(&parent->mot_obj);
 334                         mdt_object_put(info->mti_env, parent);
 335                         if (!S_ISDIR(mode))
 336                                 rc = -ENOTDIR;
 337                 }
 338         }
 339
 340         return rc;
 341 }
 342
 343 static int mdt_get_root(struct tgt_session_info *tsi)
 344 {
 345         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 346         struct mdt_device       *mdt = info->mti_mdt;
 347         struct mdt_body         *repbody;
 348         char                    *fileset = NULL, *buffer = NULL;
 349         int                      rc;
 350         struct obd_export       *exp = info->mti_exp;
 351         char                    *nodemap_fileset;
 352
 353         ENTRY;
 354
 355         rc = mdt_check_ucred(info);
 356         if (rc)
 357                 GOTO(out, rc = err_serious(rc));
 358
 359         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GET_ROOT_PACK))
 360                 GOTO(out, rc = err_serious(-ENOMEM));
 361
 362         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 363         if (req_capsule_get_size(info->mti_pill, &RMF_NAME, RCL_CLIENT) > 0) {
 364                 fileset = req_capsule_client_get(info->mti_pill, &RMF_NAME);
 365                 if (fileset == NULL)
 366                         GOTO(out, rc = err_serious(-EFAULT));
 367         }
 368
 369         nodemap_fileset = nodemap_get_fileset(exp->exp_target_data.ted_nodemap);
 370         if (nodemap_fileset && nodemap_fileset[0]) {
 371                 CDEBUG(D_INFO, "nodemap fileset is %s\n", nodemap_fileset);
 372                 if (fileset) {
 373                         /* consider fileset from client as a sub-fileset
 374                          * of the nodemap one */
 375                         OBD_ALLOC(buffer, PATH_MAX + 1);
 376                         if (buffer == NULL)
 377                                 GOTO(out, rc = err_serious(-ENOMEM));
 378                         if (snprintf(buffer, PATH_MAX + 1, "%s/%s",
 379                                      nodemap_fileset, fileset) >= PATH_MAX + 1)
 380                                 GOTO(out, rc = err_serious(-EINVAL));
 381                         fileset = buffer;
 382                 } else {
 383                         /* enforce fileset as specified in the nodemap */
 384                         fileset = nodemap_fileset;
 385                 }
 386         }
 387
 388         if (fileset) {
 389                 CDEBUG(D_INFO, "Getting fileset %s\n", fileset);
 390                 rc = mdt_lookup_fileset(info, fileset, &repbody->mbo_fid1);
 391                 if (rc < 0)
 392                         GOTO(out, rc = err_serious(rc));
 393         } else {
 394                 repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 395         }
 396         repbody->mbo_valid |= OBD_MD_FLID;
 397
 398         EXIT;
 399 out:
 400         mdt_thread_info_fini(info);
 401         if (buffer)
 402                 OBD_FREE(buffer, PATH_MAX+1);
 403         return rc;
 404 }
 405
 406 static int mdt_statfs(struct tgt_session_info *tsi)
 407 {
 408         struct ptlrpc_request *req = tgt_ses_req(tsi);
 409         struct mdt_thread_info *info = tsi2mdt_info(tsi);
 410         struct mdt_device *mdt = info->mti_mdt;
 411         struct tg_grants_data *tgd = &mdt->mdt_lut.lut_tgd;
 412         struct md_device *next = mdt->mdt_child;
 413         struct ptlrpc_service_part *svcpt;
 414         struct obd_statfs *osfs;
 415         struct mdt_body *reqbody = NULL;
 416         struct mdt_statfs_cache *msf;
 417         int rc;
 418
 419         ENTRY;
 420
 421         svcpt = req->rq_rqbd->rqbd_svcpt;
 422
 423         /* This will trigger a watchdog timeout */
 424         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 425                          (MDT_SERVICE_WATCHDOG_FACTOR *
 426                           at_get(&svcpt->scp_at_estimate)) + 1);
 427
 428         rc = mdt_check_ucred(info);
 429         if (rc)
 430                 GOTO(out, rc = err_serious(rc));
 431
 432         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 433                 GOTO(out, rc = err_serious(-ENOMEM));
 434
 435         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 436         if (!osfs)
 437                 GOTO(out, rc = -EPROTO);
 438
 439         if (mdt_is_sum_statfs_client(req->rq_export) &&
 440                 lustre_packed_msg_size(req->rq_reqmsg) ==
 441                 req_capsule_fmt_size(req->rq_reqmsg->lm_magic,
 442                                      &RQF_MDS_STATFS_NEW, RCL_CLIENT)) {
 443                 req_capsule_extend(info->mti_pill, &RQF_MDS_STATFS_NEW);
 444                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
 445         }
 446
 447         if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
 448                 msf = &mdt->mdt_sum_osfs;
 449         else
 450                 msf = &mdt->mdt_osfs;
 451
 452         if (msf->msf_age + OBD_STATFS_CACHE_SECONDS <= ktime_get_seconds()) {
 453                         /** statfs data is too old, get up-to-date one */
 454                         if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
 455                                 rc = next->md_ops->mdo_statfs(info->mti_env,
 456                                                               next, osfs);
 457                         else
 458                                 rc = dt_statfs(info->mti_env, mdt->mdt_bottom,
 459                                                osfs);
 460                         if (rc)
 461                                 GOTO(out, rc);
 462                         spin_lock(&mdt->mdt_lock);
 463                         msf->msf_osfs = *osfs;
 464                         msf->msf_age = ktime_get_seconds();
 465                         spin_unlock(&mdt->mdt_lock);
 466         } else {
 467                         /** use cached statfs data */
 468                         spin_lock(&mdt->mdt_lock);
 469                         *osfs = msf->msf_osfs;
 470                         spin_unlock(&mdt->mdt_lock);
 471         }
 472
 473         /* at least try to account for cached pages.  its still racy and
 474          * might be under-reporting if clients haven't announced their
 475          * caches with brw recently */
 476         CDEBUG(D_SUPER | D_CACHE, "blocks cached %llu granted %llu"
 477                " pending %llu free %llu avail %llu\n",
 478                tgd->tgd_tot_dirty, tgd->tgd_tot_granted,
 479                tgd->tgd_tot_pending,
 480                osfs->os_bfree << tgd->tgd_blockbits,
 481                osfs->os_bavail << tgd->tgd_blockbits);
 482
 483         osfs->os_bavail -= min_t(u64, osfs->os_bavail,
 484                                  ((tgd->tgd_tot_dirty + tgd->tgd_tot_pending +
 485                                    osfs->os_bsize - 1) >> tgd->tgd_blockbits));
 486
 487         tgt_grant_sanity_check(mdt->mdt_lu_dev.ld_obd, __func__);
 488         CDEBUG(D_CACHE, "%llu blocks: %llu free, %llu avail; "
 489                "%llu objects: %llu free; state %x\n",
 490                osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
 491                osfs->os_files, osfs->os_ffree, osfs->os_state);
 492
 493         if (!exp_grant_param_supp(tsi->tsi_exp) &&
 494             tgd->tgd_blockbits > COMPAT_BSIZE_SHIFT) {
 495                 /* clients which don't support OBD_CONNECT_GRANT_PARAM
 496                  * should not see a block size > page size, otherwise
 497                  * cl_lost_grant goes mad. Therefore, we emulate a 4KB (=2^12)
 498                  * block size which is the biggest block size known to work
 499                  * with all client's page size. */
 500                 osfs->os_blocks <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 501                 osfs->os_bfree  <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 502                 osfs->os_bavail <<= tgd->tgd_blockbits - COMPAT_BSIZE_SHIFT;
 503                 osfs->os_bsize = 1 << COMPAT_BSIZE_SHIFT;
 504         }
 505         if (rc == 0)
 506                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 507 out:
 508         mdt_thread_info_fini(info);
 509         RETURN(rc);
 510 }
 511
 512 /**
 513  * Pack size attributes into the reply.
 514  */
 515 int mdt_pack_size2body(struct mdt_thread_info *info,
 516                         const struct lu_fid *fid, struct lustre_handle *lh)
 517 {
 518         struct mdt_body *b;
 519         struct md_attr *ma = &info->mti_attr;
 520         int dom_stripe;
 521         bool dom_lock = false;
 522
 523         ENTRY;
 524
 525         LASSERT(ma->ma_attr.la_valid & LA_MODE);
 526
 527         if (!S_ISREG(ma->ma_attr.la_mode) ||
 528             !(ma->ma_valid & MA_LOV && ma->ma_lmm != NULL))
 529                 RETURN(-ENODATA);
 530
 531         dom_stripe = mdt_lmm_dom_entry(ma->ma_lmm);
 532         /* no DoM stripe, no size in reply */
 533         if (dom_stripe == LMM_NO_DOM)
 534                 RETURN(-ENOENT);
 535
 536         if (lustre_handle_is_used(lh)) {
 537                 struct ldlm_lock *lock;
 538
 539                 lock = ldlm_handle2lock(lh);
 540                 if (lock != NULL) {
 541                         dom_lock = ldlm_has_dom(lock);
 542                         LDLM_LOCK_PUT(lock);
 543                 }
 544         }
 545
 546         /* no DoM lock, no size in reply */
 547         if (!dom_lock)
 548                 RETURN(0);
 549
 550         /* Either DoM lock exists or LMM has only DoM stripe then
 551          * return size on body. */
 552         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 553
 554         mdt_dom_object_size(info->mti_env, info->mti_mdt, fid, b, dom_lock);
 555         RETURN(0);
 556 }
 557
 558 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
 559 /*
 560  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 561  *
 562  * \param       info    thread info object
 563  * \param       repbody reply to pack ACLs into
 564  * \param       o       mdt object of file to examine
 565  * \param       nodemap nodemap of client to reply to
 566  * \retval      0       success
 567  * \retval      -errno  error getting or parsing ACL from disk
 568  */
 569 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 570                       struct mdt_object *o, struct lu_nodemap *nodemap)
 571 {
 572         const struct lu_env     *env = info->mti_env;
 573         struct md_object        *next = mdt_object_child(o);
 574         struct lu_buf           *buf = &info->mti_buf;
 575         struct mdt_device       *mdt = info->mti_mdt;
 576         struct req_capsule *pill = info->mti_pill;
 577         int rc;
 578
 579         ENTRY;
 580
 581         buf->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 582         buf->lb_len = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
 583         if (buf->lb_len == 0)
 584                 RETURN(0);
 585
 586 again:
 587         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 588         if (rc < 0) {
 589                 if (rc == -ENODATA) {
 590                         repbody->mbo_aclsize = 0;
 591                         repbody->mbo_valid |= OBD_MD_FLACL;
 592                         rc = 0;
 593                 } else if (rc == -EOPNOTSUPP) {
 594                         rc = 0;
 595                 } else {
 596                         if (rc == -ERANGE &&
 597                             exp_connect_large_acl(info->mti_exp) &&
 598                             buf->lb_buf != info->mti_big_acl) {
 599                                 if (info->mti_big_acl == NULL) {
 600                                         info->mti_big_aclsize =
 601                                                         MIN(mdt->mdt_max_ea_size,
 602                                                             XATTR_SIZE_MAX);
 603                                         OBD_ALLOC_LARGE(info->mti_big_acl,
 604                                                         info->mti_big_aclsize);
 605                                         if (info->mti_big_acl == NULL) {
 606                                                 info->mti_big_aclsize = 0;
 607                                                 CERROR("%s: unable to grow "
 608                                                        DFID" ACL buffer\n",
 609                                                        mdt_obd_name(mdt),
 610                                                        PFID(mdt_object_fid(o)));
 611                                                 RETURN(-ENOMEM);
 612                                         }
 613                                 }
 614
 615                                 CDEBUG(D_INODE, "%s: grow the "DFID
 616                                        " ACL buffer to size %d\n",
 617                                        mdt_obd_name(mdt),
 618                                        PFID(mdt_object_fid(o)),
 619                                        info->mti_big_aclsize);
 620
 621                                 buf->lb_buf = info->mti_big_acl;
 622                                 buf->lb_len = info->mti_big_aclsize;
 623
 624                                 goto again;
 625                         }
 626
 627                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 628                                mdt_obd_name(mdt), PFID(mdt_object_fid(o)), rc);
 629                 }
 630         } else {
 631                 int client;
 632                 int server;
 633                 int acl_buflen;
 634                 int lmm_buflen = 0;
 635                 int lmmsize = 0;
 636
 637                 acl_buflen = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
 638                 if (acl_buflen >= rc)
 639                         goto map;
 640
 641                 /* If LOV/LMA EA is small, we can reuse part of their buffer */
 642                 client = ptlrpc_req_get_repsize(pill->rc_req);
 643                 server = lustre_packed_msg_size(pill->rc_req->rq_repmsg);
 644                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER)) {
 645                         lmm_buflen = req_capsule_get_size(pill, &RMF_MDT_MD,
 646                                                           RCL_SERVER);
 647                         lmmsize = repbody->mbo_eadatasize;
 648                 }
 649
 650                 if (client < server - acl_buflen - lmm_buflen + rc + lmmsize) {
 651                         CDEBUG(D_INODE, "%s: client prepared buffer size %d "
 652                                "is not big enough with the ACL size %d (%d)\n",
 653                                mdt_obd_name(mdt), client, rc,
 654                                server - acl_buflen - lmm_buflen + rc + lmmsize);
 655                         repbody->mbo_aclsize = 0;
 656                         repbody->mbo_valid &= ~OBD_MD_FLACL;
 657                         RETURN(-ERANGE);
 658                 }
 659
 660 map:
 661                 if (buf->lb_buf == info->mti_big_acl)
 662                         info->mti_big_acl_used = 1;
 663
 664                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 665                                      rc, NODEMAP_FS_TO_CLIENT);
 666                 /* if all ACLs mapped out, rc is still >= 0 */
 667                 if (rc < 0) {
 668                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 669                                " ACL: rc = %d\n", mdt_obd_name(mdt),
 670                                PFID(mdt_object_fid(o)), rc);
 671                         repbody->mbo_aclsize = 0;
 672                         repbody->mbo_valid &= ~OBD_MD_FLACL;
 673                 } else {
 674                         repbody->mbo_aclsize = rc;
 675                         repbody->mbo_valid |= OBD_MD_FLACL;
 676                         rc = 0;
 677                 }
 678         }
 679
 680         RETURN(rc);
 681 }
 682 #endif
 683
 684 /* XXX Look into layout in MDT layer. */
 685 static inline bool mdt_hsm_is_released(struct lov_mds_md *lmm)
 686 {
 687         struct lov_comp_md_v1   *comp_v1;
 688         struct lov_mds_md       *v1;
 689         int                      i;
 690
 691         if (lmm->lmm_magic == LOV_MAGIC_COMP_V1) {
 692                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
 693
 694                 for (i = 0; i < comp_v1->lcm_entry_count; i++) {
 695                         v1 = (struct lov_mds_md *)((char *)comp_v1 +
 696                                 comp_v1->lcm_entries[i].lcme_offset);
 697                         /* We don't support partial release for now */
 698                         if (!(v1->lmm_pattern & LOV_PATTERN_F_RELEASED))
 699                                 return false;
 700                 }
 701                 return true;
 702         } else {
 703                 return (lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) ?
 704                         true : false;
 705         }
 706 }
 707
 708 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 709                         const struct lu_attr *attr, const struct lu_fid *fid)
 710 {
 711         struct md_attr *ma = &info->mti_attr;
 712         struct obd_export *exp = info->mti_exp;
 713         struct lu_nodemap *nodemap = NULL;
 714
 715         LASSERT(ma->ma_valid & MA_INODE);
 716
 717         if (attr->la_valid & LA_ATIME) {
 718                 b->mbo_atime = attr->la_atime;
 719                 b->mbo_valid |= OBD_MD_FLATIME;
 720         }
 721         if (attr->la_valid & LA_MTIME) {
 722                 b->mbo_mtime = attr->la_mtime;
 723                 b->mbo_valid |= OBD_MD_FLMTIME;
 724         }
 725         if (attr->la_valid & LA_CTIME) {
 726                 b->mbo_ctime = attr->la_ctime;
 727                 b->mbo_valid |= OBD_MD_FLCTIME;
 728         }
 729         if (attr->la_valid & LA_FLAGS) {
 730                 b->mbo_flags = attr->la_flags;
 731                 b->mbo_valid |= OBD_MD_FLFLAGS;
 732         }
 733         if (attr->la_valid & LA_NLINK) {
 734                 b->mbo_nlink = attr->la_nlink;
 735                 b->mbo_valid |= OBD_MD_FLNLINK;
 736         }
 737         if (attr->la_valid & (LA_UID|LA_GID)) {
 738                 nodemap = nodemap_get_from_exp(exp);
 739                 if (IS_ERR(nodemap))
 740                         goto out;
 741         }
 742         if (attr->la_valid & LA_UID) {
 743                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 744                                             NODEMAP_FS_TO_CLIENT,
 745                                             attr->la_uid);
 746                 b->mbo_valid |= OBD_MD_FLUID;
 747         }
 748         if (attr->la_valid & LA_GID) {
 749                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 750                                             NODEMAP_FS_TO_CLIENT,
 751                                             attr->la_gid);
 752                 b->mbo_valid |= OBD_MD_FLGID;
 753         }
 754
 755         if (attr->la_valid & LA_PROJID) {
 756                 /* TODO, nodemap for project id */
 757                 b->mbo_projid = attr->la_projid;
 758                 b->mbo_valid |= OBD_MD_FLPROJID;
 759         }
 760
 761         b->mbo_mode = attr->la_mode;
 762         if (attr->la_valid & LA_MODE)
 763                 b->mbo_valid |= OBD_MD_FLMODE;
 764         if (attr->la_valid & LA_TYPE)
 765                 b->mbo_valid |= OBD_MD_FLTYPE;
 766
 767         if (fid != NULL) {
 768                 b->mbo_fid1 = *fid;
 769                 b->mbo_valid |= OBD_MD_FLID;
 770                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid=%#llx\n",
 771                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 772         }
 773
 774         if (!(attr->la_valid & LA_TYPE))
 775                 return;
 776
 777         b->mbo_rdev   = attr->la_rdev;
 778         b->mbo_size   = attr->la_size;
 779         b->mbo_blocks = attr->la_blocks;
 780
 781         if (!S_ISREG(attr->la_mode)) {
 782                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 783         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 784                 /* means no objects are allocated on osts. */
 785                 LASSERT(!(ma->ma_valid & MA_LOV));
 786                 /* just ignore blocks occupied by extend attributes on MDS */
 787                 b->mbo_blocks = 0;
 788                 /* if no object is allocated on osts, the size on mds is valid.
 789                  * b=22272 */
 790                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 791         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL) {
 792                 if (mdt_hsm_is_released(ma->ma_lmm)) {
 793                         /* A released file stores its size on MDS. */
 794                         /* But return 1 block for released file, unless tools
 795                          * like tar will consider it fully sparse. (LU-3864)
 796                          */
 797                         if (unlikely(b->mbo_size == 0))
 798                                 b->mbo_blocks = 0;
 799                         else
 800                                 b->mbo_blocks = 1;
 801                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 802                 } else if (info->mti_som_valid) { /* som is valid */
 803                         b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 804                 } else if (ma->ma_valid & MA_SOM) { /* lsom is valid */
 805                         b->mbo_valid |= OBD_MD_FLLAZYSIZE | OBD_MD_FLLAZYBLOCKS;
 806                         b->mbo_size = ma->ma_som.ms_size;
 807                         b->mbo_blocks = ma->ma_som.ms_blocks;
 808                 }
 809         }
 810
 811         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE ||
 812                             b->mbo_valid & OBD_MD_FLLAZYSIZE))
 813                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 814                        PFID(fid), (unsigned long long)b->mbo_size);
 815
 816 out:
 817         if (!IS_ERR_OR_NULL(nodemap))
 818                 nodemap_putref(nodemap);
 819 }
 820
 821 static inline int mdt_body_has_lov(const struct lu_attr *la,
 822                                    const struct mdt_body *body)
 823 {
 824         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 825                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 826 }
 827
 828 void mdt_client_compatibility(struct mdt_thread_info *info)
 829 {
 830         struct mdt_body       *body;
 831         struct ptlrpc_request *req = mdt_info_req(info);
 832         struct obd_export     *exp = req->rq_export;
 833         struct md_attr        *ma = &info->mti_attr;
 834         struct lu_attr        *la = &ma->ma_attr;
 835         ENTRY;
 836
 837         if (exp_connect_layout(exp))
 838                 /* the client can deal with 16-bit lmm_stripe_count */
 839                 RETURN_EXIT;
 840
 841         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 842
 843         if (!mdt_body_has_lov(la, body))
 844                 RETURN_EXIT;
 845
 846         /* now we have a reply with a lov for a client not compatible with the
 847          * layout lock so we have to clean the layout generation number */
 848         if (S_ISREG(la->la_mode))
 849                 ma->ma_lmm->lmm_layout_gen = 0;
 850         EXIT;
 851 }
 852
 853 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 854                                    struct mdt_object *o)
 855 {
 856         const struct lu_env *env = info->mti_env;
 857         int rc, rc2;
 858
 859         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 860                           XATTR_NAME_LOV);
 861
 862         if (rc == -ENODATA)
 863                 rc = 0;
 864
 865         if (rc < 0)
 866                 goto out;
 867
 868         /* Is it a directory? Let's check for the LMV as well */
 869         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 870                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 871                                    XATTR_NAME_LMV);
 872
 873                 if (rc2 == -ENODATA)
 874                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 875                                            &LU_BUF_NULL,
 876                                            XATTR_NAME_DEFAULT_LMV);
 877
 878                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 879                         rc = rc2;
 880         }
 881
 882 out:
 883         return rc;
 884 }
 885
 886 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 887                       const char *name)
 888 {
 889         const struct lu_env *env = info->mti_env;
 890         int rc;
 891         ENTRY;
 892
 893         LASSERT(info->mti_big_lmm_used == 0);
 894         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 895         if (rc < 0)
 896                 RETURN(rc);
 897
 898         /* big_lmm may need to be grown */
 899         if (info->mti_big_lmmsize < rc) {
 900                 int size = size_roundup_power2(rc);
 901
 902                 if (info->mti_big_lmmsize > 0) {
 903                         /* free old buffer */
 904                         LASSERT(info->mti_big_lmm);
 905                         OBD_FREE_LARGE(info->mti_big_lmm,
 906                                        info->mti_big_lmmsize);
 907                         info->mti_big_lmm = NULL;
 908                         info->mti_big_lmmsize = 0;
 909                 }
 910
 911                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 912                 if (info->mti_big_lmm == NULL)
 913                         RETURN(-ENOMEM);
 914                 info->mti_big_lmmsize = size;
 915         }
 916         LASSERT(info->mti_big_lmmsize >= rc);
 917
 918         info->mti_buf.lb_buf = info->mti_big_lmm;
 919         info->mti_buf.lb_len = info->mti_big_lmmsize;
 920         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 921
 922         RETURN(rc);
 923 }
 924
 925 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 926                    struct md_attr *ma, const char *name)
 927 {
 928         struct md_object *next = mdt_object_child(o);
 929         struct lu_buf    *buf = &info->mti_buf;
 930         int rc;
 931
 932         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 933                 buf->lb_buf = ma->ma_lmm;
 934                 buf->lb_len = ma->ma_lmm_size;
 935                 LASSERT(!(ma->ma_valid & MA_LOV));
 936         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 937                 buf->lb_buf = ma->ma_lmv;
 938                 buf->lb_len = ma->ma_lmv_size;
 939                 LASSERT(!(ma->ma_valid & MA_LMV));
 940         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 941                 buf->lb_buf = ma->ma_default_lmv;
 942                 buf->lb_len = ma->ma_default_lmv_size;
 943                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 944         } else {
 945                 return -EINVAL;
 946         }
 947
 948         LASSERT(buf->lb_buf);
 949
 950         rc = mo_xattr_get(info->mti_env, next, buf, name);
 951         if (rc > 0) {
 952
 953 got:
 954                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 955                         if (info->mti_big_lmm_used)
 956                                 ma->ma_lmm = info->mti_big_lmm;
 957
 958                         /* NOT return LOV EA with hole to old client. */
 959                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 960                                      LOV_PATTERN_F_HOLE) &&
 961                             !(exp_connect_flags(info->mti_exp) &
 962                               OBD_CONNECT_LFSCK)) {
 963                                 return -EIO;
 964                         } else {
 965                                 ma->ma_lmm_size = rc;
 966                                 ma->ma_valid |= MA_LOV;
 967                         }
 968                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 969                         if (info->mti_big_lmm_used)
 970                                 ma->ma_lmv = info->mti_big_lmm;
 971
 972                         ma->ma_lmv_size = rc;
 973                         ma->ma_valid |= MA_LMV;
 974                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 975                         ma->ma_default_lmv_size = rc;
 976                         ma->ma_valid |= MA_LMV_DEF;
 977                 }
 978
 979                 /* Update mdt_max_mdsize so all clients will be aware that */
 980                 if (info->mti_mdt->mdt_max_mdsize < rc)
 981                         info->mti_mdt->mdt_max_mdsize = rc;
 982
 983                 rc = 0;
 984         } else if (rc == -ENODATA) {
 985                 /* no LOV EA */
 986                 rc = 0;
 987         } else if (rc == -ERANGE) {
 988                 /* Default LMV has fixed size, so it must be able to fit
 989                  * in the original buffer */
 990                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 991                         return rc;
 992                 rc = mdt_big_xattr_get(info, o, name);
 993                 if (rc > 0) {
 994                         info->mti_big_lmm_used = 1;
 995                         goto got;
 996                 }
 997         }
 998
 999         return rc;
1000 }
1001
1002 int mdt_attr_get_pfid(struct mdt_thread_info *info, struct mdt_object *o,
1003                       struct lu_fid *pfid)
1004 {
1005         struct lu_buf           *buf = &info->mti_buf;
1006         struct link_ea_header   *leh;
1007         struct link_ea_entry    *lee;
1008         int                      rc;
1009         ENTRY;
1010
1011         buf->lb_buf = info->mti_big_lmm;
1012         buf->lb_len = info->mti_big_lmmsize;
1013         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
1014                           buf, XATTR_NAME_LINK);
1015         /* ignore errors, MA_PFID won't be set and it is
1016          * up to the caller to treat this as an error */
1017         if (rc == -ERANGE || buf->lb_len == 0) {
1018                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
1019                 buf->lb_buf = info->mti_big_lmm;
1020                 buf->lb_len = info->mti_big_lmmsize;
1021         }
1022
1023         if (rc < 0)
1024                 RETURN(rc);
1025         if (rc < sizeof(*leh)) {
1026                 CERROR("short LinkEA on "DFID": rc = %d\n",
1027                        PFID(mdt_object_fid(o)), rc);
1028                 RETURN(-ENODATA);
1029         }
1030
1031         leh = (struct link_ea_header *) buf->lb_buf;
1032         lee = (struct link_ea_entry *)(leh + 1);
1033         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
1034                 leh->leh_magic = LINK_EA_MAGIC;
1035                 leh->leh_reccount = __swab32(leh->leh_reccount);
1036                 leh->leh_len = __swab64(leh->leh_len);
1037         }
1038         if (leh->leh_magic != LINK_EA_MAGIC)
1039                 RETURN(-EINVAL);
1040         if (leh->leh_reccount == 0)
1041                 RETURN(-ENODATA);
1042
1043         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
1044         fid_be_to_cpu(pfid, pfid);
1045
1046         RETURN(0);
1047 }
1048
1049 int mdt_attr_get_complex(struct mdt_thread_info *info,
1050                          struct mdt_object *o, struct md_attr *ma)
1051 {
1052         const struct lu_env *env = info->mti_env;
1053         struct md_object    *next = mdt_object_child(o);
1054         struct lu_buf       *buf = &info->mti_buf;
1055         int                  need = ma->ma_need;
1056         int                  rc = 0, rc2;
1057         u32                  mode;
1058         ENTRY;
1059
1060         ma->ma_valid = 0;
1061
1062         if (mdt_object_exists(o) == 0)
1063                 GOTO(out, rc = -ENOENT);
1064         mode = lu_object_attr(&next->mo_lu);
1065
1066         if (need & MA_INODE) {
1067                 ma->ma_need = MA_INODE;
1068                 rc = mo_attr_get(env, next, ma);
1069                 if (rc)
1070                         GOTO(out, rc);
1071
1072                 if (S_ISREG(mode))
1073                         (void) mdt_get_som(info, o, ma);
1074                 ma->ma_valid |= MA_INODE;
1075         }
1076
1077         if (need & MA_PFID) {
1078                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
1079                 if (rc == 0)
1080                         ma->ma_valid |= MA_PFID;
1081                 /* ignore this error, parent fid is not mandatory */
1082                 rc = 0;
1083         }
1084
1085         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
1086                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
1087                 if (rc)
1088                         GOTO(out, rc);
1089         }
1090
1091         if (need & MA_LMV && S_ISDIR(mode)) {
1092                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
1093                 if (rc != 0)
1094                         GOTO(out, rc);
1095         }
1096
1097         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
1098                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
1099                 if (rc != 0)
1100                         GOTO(out, rc);
1101         }
1102
1103         /*
1104          * In the handle of MA_INODE, we may already get the SOM attr.
1105          */
1106         if (need & MA_SOM && S_ISREG(mode) && !(ma->ma_valid & MA_SOM)) {
1107                 rc = mdt_get_som(info, o, ma);
1108                 if (rc != 0)
1109                         GOTO(out, rc);
1110         }
1111
1112         if (need & MA_HSM && S_ISREG(mode)) {
1113                 buf->lb_buf = info->mti_xattr_buf;
1114                 buf->lb_len = sizeof(info->mti_xattr_buf);
1115                 BUILD_BUG_ON(sizeof(struct hsm_attrs) >
1116                              sizeof(info->mti_xattr_buf));
1117                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
1118                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
1119                 if (rc2 == 0)
1120                         ma->ma_valid |= MA_HSM;
1121                 else if (rc2 < 0 && rc2 != -ENODATA)
1122                         GOTO(out, rc = rc2);
1123         }
1124
1125 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
1126         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
1127                 buf->lb_buf = ma->ma_acl;
1128                 buf->lb_len = ma->ma_acl_size;
1129                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
1130                 if (rc2 > 0) {
1131                         ma->ma_acl_size = rc2;
1132                         ma->ma_valid |= MA_ACL_DEF;
1133                 } else if (rc2 == -ENODATA) {
1134                         /* no ACLs */
1135                         ma->ma_acl_size = 0;
1136                 } else
1137                         GOTO(out, rc = rc2);
1138         }
1139 #endif
1140 out:
1141         ma->ma_need = need;
1142         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = %#llx ma_lmm=%p\n",
1143                rc, ma->ma_valid, ma->ma_lmm);
1144         RETURN(rc);
1145 }
1146
1147 static int mdt_getattr_internal(struct mdt_thread_info *info,
1148                                 struct mdt_object *o, int ma_need)
1149 {
1150         struct md_object        *next = mdt_object_child(o);
1151         const struct mdt_body   *reqbody = info->mti_body;
1152         struct ptlrpc_request   *req = mdt_info_req(info);
1153         struct md_attr          *ma = &info->mti_attr;
1154         struct lu_attr          *la = &ma->ma_attr;
1155         struct req_capsule      *pill = info->mti_pill;
1156         const struct lu_env     *env = info->mti_env;
1157         struct mdt_body         *repbody;
1158         struct lu_buf           *buffer = &info->mti_buf;
1159         struct obd_export       *exp = info->mti_exp;
1160         int                      rc;
1161         ENTRY;
1162
1163         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
1164                 RETURN(err_serious(-ENOMEM));
1165
1166         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1167
1168         ma->ma_valid = 0;
1169
1170         if (mdt_object_remote(o)) {
1171                 /* This object is located on remote node.*/
1172                 /* Return -ENOTSUPP for old client */
1173                 if (!mdt_is_dne_client(req->rq_export))
1174                         GOTO(out, rc = -ENOTSUPP);
1175
1176                 repbody->mbo_fid1 = *mdt_object_fid(o);
1177                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
1178                 GOTO(out, rc = 0);
1179         }
1180
1181         if (reqbody->mbo_eadatasize > 0) {
1182                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
1183                 if (buffer->lb_buf == NULL)
1184                         GOTO(out, rc = -EPROTO);
1185                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
1186                                                       RCL_SERVER);
1187         } else {
1188                 buffer->lb_buf = NULL;
1189                 buffer->lb_len = 0;
1190                 ma_need &= ~(MA_LOV | MA_LMV);
1191                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
1192                        mdt_obd_name(info->mti_mdt),
1193                        req->rq_export->exp_client_uuid.uuid);
1194         }
1195
1196         /* from 2.12.58 intent_getattr pack default LMV in reply */
1197         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1198             ((reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA)) ==
1199                     (OBD_MD_MEA | OBD_MD_DEFAULT_MEA)) &&
1200             req_capsule_has_field(&req->rq_pill, &RMF_DEFAULT_MDT_MD,
1201                                   RCL_SERVER)) {
1202                 ma->ma_lmv = buffer->lb_buf;
1203                 ma->ma_lmv_size = buffer->lb_len;
1204                 ma->ma_default_lmv = req_capsule_server_get(pill,
1205                                                 &RMF_DEFAULT_MDT_MD);
1206                 ma->ma_default_lmv_size = req_capsule_get_size(pill,
1207                                                 &RMF_DEFAULT_MDT_MD,
1208                                                 RCL_SERVER);
1209                 ma->ma_need = MA_INODE;
1210                 if (ma->ma_lmv_size > 0)
1211                         ma->ma_need |= MA_LMV;
1212                 if (ma->ma_default_lmv_size > 0)
1213                         ma->ma_need |= MA_LMV_DEF;
1214         } else if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1215                    (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
1216                 /* If it is dir and client require MEA, then we got MEA */
1217                 /* Assumption: MDT_MD size is enough for lmv size. */
1218                 ma->ma_lmv = buffer->lb_buf;
1219                 ma->ma_lmv_size = buffer->lb_len;
1220                 ma->ma_need = MA_INODE;
1221                 if (ma->ma_lmv_size > 0) {
1222                         if (reqbody->mbo_valid & OBD_MD_MEA) {
1223                                 ma->ma_need |= MA_LMV;
1224                         } else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA) {
1225                                 ma->ma_need |= MA_LMV_DEF;
1226                                 ma->ma_default_lmv = buffer->lb_buf;
1227                                 ma->ma_lmv = NULL;
1228                                 ma->ma_default_lmv_size = buffer->lb_len;
1229                                 ma->ma_lmv_size = 0;
1230                         }
1231                 }
1232         } else {
1233                 ma->ma_lmm = buffer->lb_buf;
1234                 ma->ma_lmm_size = buffer->lb_len;
1235                 ma->ma_need = MA_INODE | MA_HSM;
1236                 if (ma->ma_lmm_size > 0) {
1237                         ma->ma_need |= MA_LOV;
1238                         /* Older clients may crash if they getattr overstriped
1239                          * files
1240                          */
1241                         if (!exp_connect_overstriping(exp) &&
1242                             mdt_lmm_is_overstriping(ma->ma_lmm))
1243                                 RETURN(-EOPNOTSUPP);
1244                 }
1245         }
1246
1247         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
1248             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
1249             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
1250                 /* get default stripe info for this dir. */
1251                 ma->ma_need |= MA_LOV_DEF;
1252         }
1253         ma->ma_need |= ma_need;
1254
1255         rc = mdt_attr_get_complex(info, o, ma);
1256         if (unlikely(rc)) {
1257                 CDEBUG(rc == -ENOENT ? D_OTHER : D_ERROR,
1258                        "%s: getattr error for "DFID": rc = %d\n",
1259                        mdt_obd_name(info->mti_mdt),
1260                        PFID(mdt_object_fid(o)), rc);
1261                 RETURN(rc);
1262         }
1263
1264         /* if file is released, check if a restore is running */
1265         if (ma->ma_valid & MA_HSM) {
1266                 repbody->mbo_valid |= OBD_MD_TSTATE;
1267                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
1268                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
1269                         repbody->mbo_t_state = MS_RESTORE;
1270         }
1271
1272         if (likely(ma->ma_valid & MA_INODE))
1273                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1274         else
1275                 RETURN(-EFAULT);
1276
1277         if (mdt_body_has_lov(la, reqbody)) {
1278                 if (ma->ma_valid & MA_LOV) {
1279                         LASSERT(ma->ma_lmm_size);
1280                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1281                         if (S_ISDIR(la->la_mode))
1282                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1283                         else
1284                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1285                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1286                 }
1287                 if (ma->ma_valid & MA_LMV) {
1288                         /* Return -ENOTSUPP for old client */
1289                         if (!mdt_is_striped_client(req->rq_export))
1290                                 RETURN(-ENOTSUPP);
1291
1292                         LASSERT(S_ISDIR(la->la_mode));
1293                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1294                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1295                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1296                 }
1297                 if (ma->ma_valid & MA_LMV_DEF) {
1298                         /* Return -ENOTSUPP for old client */
1299                         if (!mdt_is_striped_client(req->rq_export))
1300                                 RETURN(-ENOTSUPP);
1301                         LASSERT(S_ISDIR(la->la_mode));
1302                         /*
1303                          * when ll_dir_getstripe() gets default LMV, it
1304                          * checks mbo_eadatasize.
1305                          */
1306                         if (!(ma->ma_valid & MA_LMV))
1307                                 repbody->mbo_eadatasize =
1308                                         ma->ma_default_lmv_size;
1309                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1310                                                OBD_MD_DEFAULT_MEA);
1311                 }
1312         } else if (S_ISLNK(la->la_mode) &&
1313                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1314                 buffer->lb_buf = ma->ma_lmm;
1315                 /* eadatasize from client includes NULL-terminator, so
1316                  * there is no need to read it */
1317                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1318                 rc = mo_readlink(env, next, buffer);
1319                 if (unlikely(rc <= 0)) {
1320                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1321                                mdt_obd_name(info->mti_mdt),
1322                                PFID(mdt_object_fid(o)), rc);
1323                         rc = -EFAULT;
1324                 } else {
1325                         int print_limit = min_t(int, PAGE_SIZE - 128, rc);
1326
1327                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1328                                 rc -= 2;
1329                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1330                         /* we need to report back size with NULL-terminator
1331                          * because client expects that */
1332                         repbody->mbo_eadatasize = rc + 1;
1333                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1334                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1335                                        "on "DFID ", expected %d\n",
1336                                        mdt_obd_name(info->mti_mdt),
1337                                        rc, PFID(mdt_object_fid(o)),
1338                                        reqbody->mbo_eadatasize - 1);
1339                         /* NULL terminate */
1340                         ((char *)ma->ma_lmm)[rc] = 0;
1341
1342                         /* If the total CDEBUG() size is larger than a page, it
1343                          * will print a warning to the console, avoid this by
1344                          * printing just the last part of the symlink. */
1345                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1346                                print_limit < rc ? "..." : "", print_limit,
1347                                (char *)ma->ma_lmm + rc - print_limit, rc);
1348                         rc = 0;
1349                 }
1350         }
1351
1352         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1353                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1354                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1355                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1356                        repbody->mbo_max_mdsize);
1357         }
1358
1359 #ifdef CONFIG_LUSTRE_FS_POSIX_ACL
1360         if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1361                  (reqbody->mbo_valid & OBD_MD_FLACL)) {
1362                 struct lu_nodemap *nodemap = nodemap_get_from_exp(exp);
1363                 if (IS_ERR(nodemap))
1364                         RETURN(PTR_ERR(nodemap));
1365
1366                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1367                 nodemap_putref(nodemap);
1368         }
1369 #endif
1370
1371 out:
1372         if (rc == 0)
1373                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1374
1375         RETURN(rc);
1376 }
1377
1378 static int mdt_getattr(struct tgt_session_info *tsi)
1379 {
1380         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1381         struct mdt_object       *obj = info->mti_object;
1382         struct req_capsule      *pill = info->mti_pill;
1383         struct mdt_body         *reqbody;
1384         struct mdt_body         *repbody;
1385         int rc, rc2;
1386         ENTRY;
1387
1388         if (unlikely(info->mti_object == NULL))
1389                 RETURN(-EPROTO);
1390
1391         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1392         LASSERT(reqbody);
1393         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1394
1395         /* Special case for Data-on-MDT files to get data version */
1396         if (unlikely(reqbody->mbo_valid & OBD_MD_FLDATAVERSION)) {
1397                 rc = mdt_data_version_get(tsi);
1398                 GOTO(out, rc);
1399         }
1400
1401         /* Unlike intent case where we need to pre-fill out buffers early on
1402          * in intent policy for ldlm reasons, here we can have a much better
1403          * guess at EA size by just reading it from disk.
1404          * Exceptions are readdir and (missing) directory striping */
1405         /* Readlink */
1406         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1407                 /* No easy way to know how long is the symlink, but it cannot
1408                  * be more than PATH_MAX, so we allocate +1 */
1409                 rc = PATH_MAX + 1;
1410         /* A special case for fs ROOT: getattr there might fetch
1411          * default EA for entire fs, not just for this dir!
1412          */
1413         } else if (lu_fid_eq(mdt_object_fid(obj),
1414                              &info->mti_mdt->mdt_md_root_fid) &&
1415                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1416                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1417                                                                  MDS_GETATTR)) {
1418                 /* Should the default strping be bigger, mdt_fix_reply
1419                  * will reallocate */
1420                 rc = DEF_REP_MD_SIZE;
1421         } else {
1422                 /* Read the actual EA size from disk */
1423                 rc = mdt_attr_get_eabuf_size(info, obj);
1424         }
1425
1426         if (rc < 0)
1427                 GOTO(out, rc = err_serious(rc));
1428
1429         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1430
1431         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
1432          * by default. If the target object has more ACL entries, then
1433          * enlarge the buffer when necessary. */
1434         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
1435                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
1436
1437         rc = req_capsule_server_pack(pill);
1438         if (unlikely(rc != 0))
1439                 GOTO(out, rc = err_serious(rc));
1440
1441         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1442         LASSERT(repbody != NULL);
1443         repbody->mbo_eadatasize = 0;
1444         repbody->mbo_aclsize = 0;
1445
1446         rc = mdt_check_ucred(info);
1447         if (unlikely(rc))
1448                 GOTO(out_shrink, rc);
1449
1450         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1451
1452         rc = mdt_getattr_internal(info, obj, 0);
1453         EXIT;
1454 out_shrink:
1455         mdt_client_compatibility(info);
1456         rc2 = mdt_fix_reply(info);
1457         if (rc == 0)
1458                 rc = rc2;
1459 out:
1460         mdt_thread_info_fini(info);
1461         return rc;
1462 }
1463
1464 /**
1465  * Handler of layout intent RPC requiring the layout modification
1466  *
1467  * \param[in] info      thread environment
1468  * \param[in] obj       object
1469  * \param[in] layout    layout change descriptor
1470  *
1471  * \retval 0    on success
1472  * \retval < 0  error code
1473  */
1474 int mdt_layout_change(struct mdt_thread_info *info, struct mdt_object *obj,
1475                       struct md_layout_change *layout)
1476 {
1477         struct mdt_lock_handle *lh = &info->mti_lh[MDT_LH_LOCAL];
1478         int rc;
1479         ENTRY;
1480
1481         if (!mdt_object_exists(obj))
1482                 GOTO(out, rc = -ENOENT);
1483
1484         if (!S_ISREG(lu_object_attr(&obj->mot_obj)))
1485                 GOTO(out, rc = -EINVAL);
1486
1487         rc = mo_permission(info->mti_env, NULL, mdt_object_child(obj), NULL,
1488                            MAY_WRITE);
1489         if (rc)
1490                 GOTO(out, rc);
1491
1492         /* take layout lock to prepare layout change */
1493         mdt_lock_reg_init(lh, LCK_EX);
1494         rc = mdt_object_lock(info, obj, lh, MDS_INODELOCK_LAYOUT);
1495         if (rc)
1496                 GOTO(out, rc);
1497
1498         mutex_lock(&obj->mot_som_mutex);
1499         rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout);
1500         mutex_unlock(&obj->mot_som_mutex);
1501         mdt_object_unlock(info, obj, lh, 1);
1502 out:
1503         RETURN(rc);
1504 }
1505
1506 /**
1507  * Exchange MOF_LOV_CREATED flags between two objects after a
1508  * layout swap. No assumption is made on whether o1 or o2 have
1509  * created objects or not.
1510  *
1511  * \param[in,out] o1    First swap layout object
1512  * \param[in,out] o2    Second swap layout object
1513  */
1514 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1515 {
1516         unsigned int o1_lov_created = o1->mot_lov_created;
1517
1518         mutex_lock(&o1->mot_lov_mutex);
1519         mutex_lock(&o2->mot_lov_mutex);
1520
1521         o1->mot_lov_created = o2->mot_lov_created;
1522         o2->mot_lov_created = o1_lov_created;
1523
1524         mutex_unlock(&o2->mot_lov_mutex);
1525         mutex_unlock(&o1->mot_lov_mutex);
1526 }
1527
1528 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1529 {
1530         struct mdt_thread_info  *info;
1531         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1532         struct obd_export       *exp = req->rq_export;
1533         struct mdt_object       *o1, *o2, *o;
1534         struct mdt_lock_handle  *lh1, *lh2;
1535         struct mdc_swap_layouts *msl;
1536         int                      rc;
1537         ENTRY;
1538
1539         /* client does not support layout lock, so layout swaping
1540          * is disabled.
1541          * FIXME: there is a problem for old clients which don't support
1542          * layout lock yet. If those clients have already opened the file
1543          * they won't be notified at all so that old layout may still be
1544          * used to do IO. This can be fixed after file release is landed by
1545          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1546         if (!exp_connect_layout(exp))
1547                 RETURN(-EOPNOTSUPP);
1548
1549         info = tsi2mdt_info(tsi);
1550         if (unlikely(info->mti_object == NULL))
1551                 RETURN(-EPROTO);
1552
1553         if (info->mti_dlm_req != NULL)
1554                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1555
1556         o1 = info->mti_object;
1557         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1558                                 &info->mti_body->mbo_fid2);
1559         if (IS_ERR(o))
1560                 GOTO(out, rc = PTR_ERR(o));
1561
1562         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1563                 GOTO(put, rc = -ENOENT);
1564
1565         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1566         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1567                 GOTO(put, rc);
1568
1569         if (rc < 0)
1570                 swap(o1, o2);
1571
1572         /* permission check. Make sure the calling process having permission
1573          * to write both files. */
1574         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1575                            MAY_WRITE);
1576         if (rc < 0)
1577                 GOTO(put, rc);
1578
1579         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1580                            MAY_WRITE);
1581         if (rc < 0)
1582                 GOTO(put, rc);
1583
1584         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1585         if (msl == NULL)
1586                 GOTO(put, rc = -EPROTO);
1587
1588         lh1 = &info->mti_lh[MDT_LH_NEW];
1589         mdt_lock_reg_init(lh1, LCK_EX);
1590         lh2 = &info->mti_lh[MDT_LH_OLD];
1591         mdt_lock_reg_init(lh2, LCK_EX);
1592
1593         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1594                              MDS_INODELOCK_XATTR);
1595         if (rc < 0)
1596                 GOTO(put, rc);
1597
1598         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1599                              MDS_INODELOCK_XATTR);
1600         if (rc < 0)
1601                 GOTO(unlock1, rc);
1602
1603         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1604                              mdt_object_child(o2), msl->msl_flags);
1605         if (rc < 0)
1606                 GOTO(unlock2, rc);
1607
1608         mdt_swap_lov_flag(o1, o2);
1609
1610 unlock2:
1611         mdt_object_unlock(info, o2, lh2, rc);
1612 unlock1:
1613         mdt_object_unlock(info, o1, lh1, rc);
1614 put:
1615         mdt_object_put(info->mti_env, o);
1616 out:
1617         mdt_thread_info_fini(info);
1618         RETURN(rc);
1619 }
1620
1621 static int mdt_raw_lookup(struct mdt_thread_info *info,
1622                           struct mdt_object *parent,
1623                           const struct lu_name *lname,
1624                           struct ldlm_reply *ldlm_rep)
1625 {
1626         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1627         int              rc;
1628         ENTRY;
1629
1630         LASSERT(!info->mti_cross_ref);
1631
1632         /* Only got the fid of this obj by name */
1633         fid_zero(child_fid);
1634         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1635                         lname, child_fid, &info->mti_spec);
1636         if (rc == 0) {
1637                 struct mdt_body *repbody;
1638
1639                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1640                 repbody->mbo_fid1 = *child_fid;
1641                 repbody->mbo_valid = OBD_MD_FLID;
1642                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1643         } else if (rc == -ENOENT) {
1644                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1645         }
1646
1647         RETURN(rc);
1648 }
1649
1650 /*
1651  * UPDATE lock should be taken against parent, and be released before exit;
1652  * child_bits lock should be taken against child, and be returned back:
1653  *            (1)normal request should release the child lock;
1654  *            (2)intent request will grant the lock to client.
1655  */
1656 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1657                                  struct mdt_lock_handle *lhc,
1658                                  __u64 child_bits,
1659                                  struct ldlm_reply *ldlm_rep)
1660 {
1661         struct ptlrpc_request  *req = mdt_info_req(info);
1662         struct mdt_body        *reqbody = NULL;
1663         struct mdt_object      *parent = info->mti_object;
1664         struct mdt_object      *child;
1665         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1666         struct lu_name         *lname = NULL;
1667         struct mdt_lock_handle *lhp = NULL;
1668         struct ldlm_lock       *lock;
1669         struct req_capsule *pill = info->mti_pill;
1670         __u64 try_bits = 0;
1671         bool is_resent;
1672         int ma_need = 0;
1673         int rc;
1674
1675         ENTRY;
1676
1677         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1678         LASSERT(ergo(is_resent,
1679                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1680
1681         if (parent == NULL)
1682                 RETURN(-ENOENT);
1683
1684         if (info->mti_cross_ref) {
1685                 /* Only getattr on the child. Parent is on another node. */
1686                 mdt_set_disposition(info, ldlm_rep,
1687                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1688                 child = parent;
1689                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1690                        "ldlm_rep = %p\n",
1691                        PFID(mdt_object_fid(child)), ldlm_rep);
1692
1693                 rc = mdt_check_resent_lock(info, child, lhc);
1694                 if (rc < 0) {
1695                         RETURN(rc);
1696                 } else if (rc > 0) {
1697                         mdt_lock_handle_init(lhc);
1698                         mdt_lock_reg_init(lhc, LCK_PR);
1699
1700                         /*
1701                          * Object's name entry is on another MDS, it will
1702                          * request PERM lock only because LOOKUP lock is owned
1703                          * by the MDS where name entry resides.
1704                          *
1705                          * TODO: it should try layout lock too. - Jinshan
1706                          */
1707                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1708                                         MDS_INODELOCK_LAYOUT);
1709                         child_bits |= MDS_INODELOCK_PERM;
1710
1711                         rc = mdt_object_lock(info, child, lhc, child_bits);
1712                         if (rc < 0)
1713                                 RETURN(rc);
1714                 }
1715
1716                 /* Finally, we can get attr for child. */
1717                 if (!mdt_object_exists(child)) {
1718                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1719                                         &child->mot_obj,
1720                                         "remote object doesn't exist.");
1721                         mdt_object_unlock(info, child, lhc, 1);
1722                         RETURN(-ENOENT);
1723                 }
1724
1725                 rc = mdt_getattr_internal(info, child, 0);
1726                 if (unlikely(rc != 0))
1727                         mdt_object_unlock(info, child, lhc, 1);
1728
1729                 mdt_pack_secctx_in_reply(info, child);
1730
1731                 RETURN(rc);
1732         }
1733
1734         lname = &info->mti_name;
1735         mdt_name_unpack(pill, &RMF_NAME, lname, MNF_FIX_ANON);
1736
1737         if (lu_name_is_valid(lname)) {
1738                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1739                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1740                        PNAME(lname), ldlm_rep);
1741         } else {
1742                 reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1743                 if (unlikely(reqbody == NULL))
1744                         RETURN(err_serious(-EPROTO));
1745
1746                 *child_fid = reqbody->mbo_fid2;
1747
1748                 if (unlikely(!fid_is_sane(child_fid)))
1749                         RETURN(err_serious(-EINVAL));
1750
1751                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1752                        "ldlm_rep = %p\n",
1753                        PFID(mdt_object_fid(parent)),
1754                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1755         }
1756
1757         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1758
1759         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1760                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1761                                 &parent->mot_obj,
1762                                 "Parent doesn't exist!");
1763                 RETURN(-ESTALE);
1764         }
1765
1766         if (mdt_object_remote(parent)) {
1767                 CERROR("%s: parent "DFID" is on remote target\n",
1768                        mdt_obd_name(info->mti_mdt),
1769                        PFID(mdt_object_fid(parent)));
1770                 RETURN(-EIO);
1771         }
1772
1773         if (lu_name_is_valid(lname)) {
1774                 /* Always allow to lookup ".." */
1775                 if (unlikely(lname->ln_namelen == 2 &&
1776                              lname->ln_name[0] == '.' &&
1777                              lname->ln_name[1] == '.'))
1778                         info->mti_spec.sp_permitted = 1;
1779
1780                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1781                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1782
1783                         RETURN(rc);
1784                 }
1785
1786                 /* step 1: lock parent only if parent is a directory */
1787                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1788                         lhp = &info->mti_lh[MDT_LH_PARENT];
1789                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1790                         rc = mdt_object_lock(info, parent, lhp,
1791                                              MDS_INODELOCK_UPDATE);
1792                         if (unlikely(rc != 0))
1793                                 RETURN(rc);
1794                 }
1795
1796                 /* step 2: lookup child's fid by name */
1797                 fid_zero(child_fid);
1798                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1799                                 child_fid, &info->mti_spec);
1800                 if (rc == -ENOENT)
1801                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1802
1803                 if (rc != 0)
1804                         GOTO(out_parent, rc);
1805         }
1806
1807         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1808
1809         /*
1810          *step 3: find the child object by fid & lock it.
1811          *        regardless if it is local or remote.
1812          *
1813          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1814          *      set parent dir fid the same as child fid in getattr by fid case
1815          *      we should not lu_object_find() the object again, could lead
1816          *      to hung if there is a concurrent unlink destroyed the object.
1817          */
1818         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1819                 mdt_object_get(info->mti_env, parent);
1820                 child = parent;
1821         } else {
1822                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1823                                         child_fid);
1824         }
1825
1826         if (unlikely(IS_ERR(child)))
1827                 GOTO(out_parent, rc = PTR_ERR(child));
1828
1829         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1830         if (!mdt_object_exists(child)) {
1831                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1832                                 &child->mot_obj,
1833                                 "Object doesn't exist!");
1834                 GOTO(out_child, rc = -ENOENT);
1835         }
1836
1837         rc = mdt_check_resent_lock(info, child, lhc);
1838         if (rc < 0) {
1839                 GOTO(out_child, rc);
1840         } else if (rc > 0) {
1841                 mdt_lock_handle_init(lhc);
1842                 mdt_lock_reg_init(lhc, LCK_PR);
1843
1844                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1845                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1846                         struct md_attr *ma = &info->mti_attr;
1847
1848                         ma->ma_valid = 0;
1849                         ma->ma_need = MA_INODE;
1850                         rc = mdt_attr_get_complex(info, child, ma);
1851                         if (unlikely(rc != 0))
1852                                 GOTO(out_child, rc);
1853
1854                         /* If the file has not been changed for some time, we
1855                          * return not only a LOOKUP lock, but also an UPDATE
1856                          * lock and this might save us RPC on later STAT. For
1857                          * directories, it also let negative dentry cache start
1858                          * working for this dir. */
1859                         if (ma->ma_valid & MA_INODE &&
1860                             ma->ma_attr.la_valid & LA_CTIME &&
1861                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1862                                 ma->ma_attr.la_ctime < ktime_get_real_seconds())
1863                                 child_bits |= MDS_INODELOCK_UPDATE;
1864                 }
1865
1866                 /* layout lock must be granted in a best-effort way
1867                  * for IT operations */
1868                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1869                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
1870                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1871                         if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1872                             exp_connect_layout(info->mti_exp)) {
1873                                 /* try to grant layout lock for regular file. */
1874                                 try_bits = MDS_INODELOCK_LAYOUT;
1875                         }
1876                         /* Acquire DOM lock in advance for data-on-mdt file */
1877                         if (child != parent)
1878                                 try_bits |= MDS_INODELOCK_DOM;
1879                 }
1880
1881                 if (try_bits != 0) {
1882                         /* try layout lock, it may fail to be granted due to
1883                          * contention at LOOKUP or UPDATE */
1884                         rc = mdt_object_lock_try(info, child, lhc, &child_bits,
1885                                                  try_bits, false);
1886                         if (child_bits & MDS_INODELOCK_LAYOUT)
1887                                 ma_need |= MA_LOV;
1888                 } else {
1889                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1890                          * client will enqueue the lock to the remote MDT */
1891                         if (mdt_object_remote(child))
1892                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1893                         rc = mdt_object_lock(info, child, lhc, child_bits);
1894                 }
1895                 if (unlikely(rc != 0))
1896                         GOTO(out_child, rc);
1897         }
1898
1899         /* finally, we can get attr for child. */
1900         rc = mdt_getattr_internal(info, child, ma_need);
1901         if (unlikely(rc != 0)) {
1902                 mdt_object_unlock(info, child, lhc, 1);
1903                 GOTO(out_child, rc);
1904         }
1905
1906         mdt_pack_secctx_in_reply(info, child);
1907
1908         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1909         if (lock) {
1910                 /* Debugging code. */
1911                 LDLM_DEBUG(lock, "Returning lock to client");
1912                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1913                                          &lock->l_resource->lr_name),
1914                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1915                          PLDLMRES(lock->l_resource),
1916                          PFID(mdt_object_fid(child)));
1917
1918                 if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
1919                     mdt_object_exists(child) && !mdt_object_remote(child) &&
1920                     child != parent) {
1921                         mdt_object_put(info->mti_env, child);
1922                         rc = mdt_pack_size2body(info, child_fid,
1923                                                 &lhc->mlh_reg_lh);
1924                         if (rc != 0 && child_bits & MDS_INODELOCK_DOM) {
1925                                 /* DOM lock was taken in advance but this is
1926                                  * not DoM file. Drop the lock.
1927                                  */
1928                                 lock_res_and_lock(lock);
1929                                 ldlm_inodebits_drop(lock, MDS_INODELOCK_DOM);
1930                                 unlock_res_and_lock(lock);
1931                         }
1932                         LDLM_LOCK_PUT(lock);
1933                         GOTO(out_parent, rc = 0);
1934                 }
1935                 LDLM_LOCK_PUT(lock);
1936         }
1937
1938         EXIT;
1939 out_child:
1940         mdt_object_put(info->mti_env, child);
1941 out_parent:
1942         if (lhp)
1943                 mdt_object_unlock(info, parent, lhp, 1);
1944         return rc;
1945 }
1946
1947 /* normal handler: should release the child lock */
1948 static int mdt_getattr_name(struct tgt_session_info *tsi)
1949 {
1950         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1951         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1952         struct mdt_body        *reqbody;
1953         struct mdt_body        *repbody;
1954         int rc, rc2;
1955         ENTRY;
1956
1957         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1958         LASSERT(reqbody != NULL);
1959         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1960         LASSERT(repbody != NULL);
1961
1962         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1963         repbody->mbo_eadatasize = 0;
1964         repbody->mbo_aclsize = 0;
1965
1966         rc = mdt_init_ucred_intent_getattr(info, reqbody);
1967         if (unlikely(rc))
1968                 GOTO(out_shrink, rc);
1969
1970         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1971         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1972                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1973                 lhc->mlh_reg_lh.cookie = 0;
1974         }
1975         mdt_exit_ucred(info);
1976         EXIT;
1977 out_shrink:
1978         mdt_client_compatibility(info);
1979         rc2 = mdt_fix_reply(info);
1980         if (rc == 0)
1981                 rc = rc2;
1982         mdt_thread_info_fini(info);
1983         return rc;
1984 }
1985
1986 static int mdt_rmfid_unlink(struct mdt_thread_info *info,
1987                             const struct lu_fid *pfid,
1988                             const struct lu_name *name,
1989                             struct mdt_object *obj, s64 ctime)
1990 {
1991         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1992         struct ldlm_enqueue_info *einfo = &info->mti_einfo[0];
1993         struct mdt_device *mdt = info->mti_mdt;
1994         struct md_attr *ma = &info->mti_attr;
1995         struct mdt_lock_handle *parent_lh;
1996         struct mdt_lock_handle *child_lh;
1997         struct mdt_object *pobj;
1998         bool cos_incompat = false;
1999         int rc;
2000         ENTRY;
2001
2002         pobj = mdt_object_find(info->mti_env, mdt, pfid);
2003         if (IS_ERR(pobj))
2004                 GOTO(out, rc = PTR_ERR(pobj));
2005
2006         parent_lh = &info->mti_lh[MDT_LH_PARENT];
2007         mdt_lock_pdo_init(parent_lh, LCK_PW, name);
2008         rc = mdt_object_lock(info, pobj, parent_lh, MDS_INODELOCK_UPDATE);
2009         if (rc != 0)
2010                 GOTO(put_parent, rc);
2011
2012         if (mdt_object_remote(pobj))
2013                 cos_incompat = true;
2014
2015         rc = mdo_lookup(info->mti_env, mdt_object_child(pobj),
2016                         name, child_fid, &info->mti_spec);
2017         if (rc != 0)
2018                 GOTO(unlock_parent, rc);
2019
2020         if (!lu_fid_eq(child_fid, mdt_object_fid(obj)))
2021                 GOTO(unlock_parent, rc = -EREMCHG);
2022
2023         child_lh = &info->mti_lh[MDT_LH_CHILD];
2024         mdt_lock_reg_init(child_lh, LCK_EX);
2025         rc = mdt_reint_striped_lock(info, obj, child_lh,
2026                                     MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE,
2027                                     einfo, cos_incompat);
2028         if (rc != 0)
2029                 GOTO(unlock_parent, rc);
2030
2031         if (atomic_read(&obj->mot_open_count)) {
2032                 CDEBUG(D_OTHER, "object "DFID" open, skip\n",
2033                        PFID(mdt_object_fid(obj)));
2034                 GOTO(unlock_child, rc = -EBUSY);
2035         }
2036
2037         ma->ma_need = 0;
2038         ma->ma_valid = MA_INODE;
2039         ma->ma_attr.la_valid = LA_CTIME;
2040         ma->ma_attr.la_ctime = ctime;
2041
2042         mutex_lock(&obj->mot_lov_mutex);
2043
2044         rc = mdo_unlink(info->mti_env, mdt_object_child(pobj),
2045                         mdt_object_child(obj), name, ma, 0);
2046
2047         mutex_unlock(&obj->mot_lov_mutex);
2048
2049 unlock_child:
2050         mdt_reint_striped_unlock(info, obj, child_lh, einfo, 1);
2051 unlock_parent:
2052         mdt_object_unlock(info, pobj, parent_lh, 1);
2053 put_parent:
2054         mdt_object_put(info->mti_env, pobj);
2055 out:
2056         RETURN(rc);
2057 }
2058
2059 static int mdt_rmfid_check_permission(struct mdt_thread_info *info,
2060                                         struct mdt_object *obj)
2061 {
2062         struct lu_ucred *uc = lu_ucred(info->mti_env);
2063         struct md_attr *ma = &info->mti_attr;
2064         struct lu_attr *la = &ma->ma_attr;
2065         int rc = 0;
2066         ENTRY;
2067
2068         ma->ma_need = MA_INODE;
2069         rc = mo_attr_get(info->mti_env, mdt_object_child(obj), ma);
2070         if (rc)
2071                 GOTO(out, rc);
2072
2073         if (la->la_flags & LUSTRE_IMMUTABLE_FL)
2074                         rc = -EACCES;
2075
2076         if (md_capable(uc, CFS_CAP_DAC_OVERRIDE))
2077                 RETURN(0);
2078         if (uc->uc_fsuid == la->la_uid) {
2079                 if ((la->la_mode & S_IWUSR) == 0)
2080                         rc = -EACCES;
2081         } else if (uc->uc_fsgid == la->la_gid) {
2082                 if ((la->la_mode & S_IWGRP) == 0)
2083                         rc = -EACCES;
2084         } else if ((la->la_mode & S_IWOTH) == 0) {
2085                         rc = -EACCES;
2086         }
2087
2088 out:
2089         RETURN(rc);
2090 }
2091
2092 static int mdt_rmfid_one(struct mdt_thread_info *info, struct lu_fid *fid,
2093                          s64 ctime)
2094 {
2095         struct mdt_device *mdt = info->mti_mdt;
2096         struct mdt_object *obj = NULL;
2097         struct linkea_data ldata = { NULL };
2098         struct lu_buf *buf = &info->mti_big_buf;
2099         struct lu_name *name = &info->mti_name;
2100         struct lu_fid *pfid = &info->mti_tmp_fid1;
2101         struct link_ea_header *leh;
2102         struct link_ea_entry *lee;
2103         int reclen, count, rc = 0;
2104         ENTRY;
2105
2106         if (!fid_is_sane(fid))
2107                 GOTO(out, rc = -EINVAL);
2108
2109         if (!fid_is_namespace_visible(fid))
2110                 GOTO(out, rc = -EINVAL);
2111
2112         obj = mdt_object_find(info->mti_env, mdt, fid);
2113         if (IS_ERR(obj))
2114                 GOTO(out, rc = PTR_ERR(obj));
2115
2116         if (mdt_object_remote(obj))
2117                 GOTO(out, rc = -EREMOTE);
2118         if (!mdt_object_exists(obj) || lu_object_is_dying(&obj->mot_header))
2119                 GOTO(out, rc = -ENOENT);
2120
2121         rc = mdt_rmfid_check_permission(info, obj);
2122         if (rc)
2123                 GOTO(out, rc);
2124
2125         /* take LinkEA */
2126         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
2127         if (!buf->lb_buf)
2128                 GOTO(out, rc = -ENOMEM);
2129
2130         ldata.ld_buf = buf;
2131         rc = mdt_links_read(info, obj, &ldata);
2132         if (rc)
2133                 GOTO(out, rc);
2134
2135         leh = buf->lb_buf;
2136         lee = (struct link_ea_entry *)(leh + 1);
2137         for (count = 0; count < leh->leh_reccount; count++) {
2138                 /* remove every hardlink */
2139                 linkea_entry_unpack(lee, &reclen, name, pfid);
2140                 lee = (struct link_ea_entry *) ((char *)lee + reclen);
2141                 rc = mdt_rmfid_unlink(info, pfid, name, obj, ctime);
2142                 if (rc)
2143                         break;
2144         }
2145
2146 out:
2147         if (obj && !IS_ERR(obj))
2148                 mdt_object_put(info->mti_env, obj);
2149         if (info->mti_big_buf.lb_buf)
2150                 lu_buf_free(&info->mti_big_buf);
2151
2152         RETURN(rc);
2153 }
2154
2155 static int mdt_rmfid(struct tgt_session_info *tsi)
2156 {
2157         struct mdt_thread_info *mti = tsi2mdt_info(tsi);
2158         struct mdt_body *reqbody;
2159         struct lu_fid *fids, *rfids;
2160         int bufsize, rc;
2161         __u32 *rcs;
2162         int i, nr;
2163         ENTRY;
2164
2165         reqbody = req_capsule_client_get(tsi->tsi_pill, &RMF_MDT_BODY);
2166         if (reqbody == NULL)
2167                 RETURN(-EPROTO);
2168         bufsize = req_capsule_get_size(tsi->tsi_pill, &RMF_FID_ARRAY,
2169                                        RCL_CLIENT);
2170         nr = bufsize / sizeof(struct lu_fid);
2171         if (nr * sizeof(struct lu_fid) != bufsize)
2172                 RETURN(-EINVAL);
2173         req_capsule_set_size(tsi->tsi_pill, &RMF_RCS,
2174                              RCL_SERVER, nr * sizeof(__u32));
2175         req_capsule_set_size(tsi->tsi_pill, &RMF_FID_ARRAY,
2176                              RCL_SERVER, nr * sizeof(struct lu_fid));
2177         rc = req_capsule_server_pack(tsi->tsi_pill);
2178         if (rc)
2179                 GOTO(out, rc = err_serious(rc));
2180         fids = req_capsule_client_get(tsi->tsi_pill, &RMF_FID_ARRAY);
2181         if (fids == NULL)
2182                 RETURN(-EPROTO);
2183         rcs = req_capsule_server_get(tsi->tsi_pill, &RMF_RCS);
2184         LASSERT(rcs);
2185         rfids = req_capsule_server_get(tsi->tsi_pill, &RMF_FID_ARRAY);
2186         LASSERT(rfids);
2187
2188         mdt_init_ucred(mti, reqbody);
2189         for (i = 0; i < nr; i++) {
2190                 rfids[i] = fids[i];
2191                 rcs[i] = mdt_rmfid_one(mti, fids + i, reqbody->mbo_ctime);
2192         }
2193         mdt_exit_ucred(mti);
2194
2195 out:
2196         RETURN(rc);
2197 }
2198
2199 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2200                          void *karg, void __user *uarg);
2201
2202 static int mdt_set_info(struct tgt_session_info *tsi)
2203 {
2204         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2205         char                    *key;
2206         void                    *val;
2207         int                      keylen, vallen, rc = 0;
2208
2209         ENTRY;
2210
2211         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
2212         if (key == NULL) {
2213                 DEBUG_REQ(D_HA, req, "no set_info key");
2214                 RETURN(err_serious(-EFAULT));
2215         }
2216
2217         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
2218                                       RCL_CLIENT);
2219
2220         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
2221         if (val == NULL) {
2222                 DEBUG_REQ(D_HA, req, "no set_info val");
2223                 RETURN(err_serious(-EFAULT));
2224         }
2225
2226         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
2227                                       RCL_CLIENT);
2228
2229         /* Swab any part of val you need to here */
2230         if (KEY_IS(KEY_READ_ONLY)) {
2231                 spin_lock(&req->rq_export->exp_lock);
2232                 if (*(__u32 *)val)
2233                         *exp_connect_flags_ptr(req->rq_export) |=
2234                                 OBD_CONNECT_RDONLY;
2235                 else
2236                         *exp_connect_flags_ptr(req->rq_export) &=
2237                                 ~OBD_CONNECT_RDONLY;
2238                 spin_unlock(&req->rq_export->exp_lock);
2239         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2240                 struct changelog_setinfo *cs = val;
2241
2242                 if (vallen != sizeof(*cs)) {
2243                         CERROR("%s: bad changelog_clear setinfo size %d\n",
2244                                tgt_name(tsi->tsi_tgt), vallen);
2245                         RETURN(-EINVAL);
2246                 }
2247                 if (ptlrpc_req_need_swab(req)) {
2248                         __swab64s(&cs->cs_recno);
2249                         __swab32s(&cs->cs_id);
2250                 }
2251
2252                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
2253                                    vallen, val, NULL);
2254         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
2255                 if (vallen > 0)
2256                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
2257         } else {
2258                 RETURN(-EINVAL);
2259         }
2260         RETURN(rc);
2261 }
2262
2263 static int mdt_readpage(struct tgt_session_info *tsi)
2264 {
2265         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
2266         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
2267         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
2268         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
2269         struct mdt_body         *repbody;
2270         int                      rc;
2271         int                      i;
2272
2273         ENTRY;
2274
2275         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
2276                 RETURN(err_serious(-ENOMEM));
2277
2278         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
2279         if (repbody == NULL || reqbody == NULL)
2280                 RETURN(err_serious(-EFAULT));
2281
2282         /*
2283          * prepare @rdpg before calling lower layers and transfer itself. Here
2284          * reqbody->size contains offset of where to start to read and
2285          * reqbody->nlink contains number bytes to read.
2286          */
2287         rdpg->rp_hash = reqbody->mbo_size;
2288         if (rdpg->rp_hash != reqbody->mbo_size) {
2289                 CERROR("Invalid hash: %#llx != %#llx\n",
2290                        rdpg->rp_hash, reqbody->mbo_size);
2291                 RETURN(-EFAULT);
2292         }
2293
2294         rdpg->rp_attrs = reqbody->mbo_mode;
2295         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
2296                 rdpg->rp_attrs |= LUDA_64BITHASH;
2297         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
2298                                 exp_max_brw_size(tsi->tsi_exp));
2299         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >>
2300                           PAGE_SHIFT;
2301         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
2302         if (rdpg->rp_pages == NULL)
2303                 RETURN(-ENOMEM);
2304
2305         for (i = 0; i < rdpg->rp_npages; ++i) {
2306                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
2307                 if (rdpg->rp_pages[i] == NULL)
2308                         GOTO(free_rdpg, rc = -ENOMEM);
2309         }
2310
2311         /* call lower layers to fill allocated pages with directory data */
2312         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
2313         if (rc < 0)
2314                 GOTO(free_rdpg, rc);
2315
2316         /* send pages to client */
2317         rc = tgt_sendpage(tsi, rdpg, rc);
2318
2319         EXIT;
2320 free_rdpg:
2321
2322         for (i = 0; i < rdpg->rp_npages; i++)
2323                 if (rdpg->rp_pages[i] != NULL)
2324                         __free_page(rdpg->rp_pages[i]);
2325         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
2326
2327         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
2328                 RETURN(0);
2329
2330         return rc;
2331 }
2332
2333 static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
2334 {
2335         struct lu_ucred *uc = mdt_ucred_check(info);
2336         struct lu_attr *attr = &info->mti_attr.ma_attr;
2337
2338         if (uc == NULL)
2339                 return -EINVAL;
2340
2341         if (op != REINT_SETATTR) {
2342                 if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
2343                         attr->la_uid = uc->uc_fsuid;
2344                 /* for S_ISGID, inherit gid from his parent, such work will be
2345                  * done in cmm/mdd layer, here set all cases as uc->uc_fsgid. */
2346                 if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
2347                         attr->la_gid = uc->uc_fsgid;
2348         }
2349
2350         return 0;
2351 }
2352
2353 static inline bool mdt_is_readonly_open(struct mdt_thread_info *info, __u32 op)
2354 {
2355         return op == REINT_OPEN &&
2356              !(info->mti_spec.sp_cr_flags & (MDS_FMODE_WRITE | MDS_OPEN_CREAT));
2357 }
2358
2359 static void mdt_preset_secctx_size(struct mdt_thread_info *info)
2360 {
2361         struct req_capsule *pill = info->mti_pill;
2362
2363         if (req_capsule_has_field(pill, &RMF_FILE_SECCTX,
2364                                   RCL_SERVER) &&
2365             req_capsule_has_field(pill, &RMF_FILE_SECCTX_NAME,
2366                                   RCL_CLIENT)) {
2367                 if (req_capsule_get_size(pill, &RMF_FILE_SECCTX_NAME,
2368                                          RCL_CLIENT) != 0) {
2369                         /* pre-set size in server part with max size */
2370                         req_capsule_set_size(pill, &RMF_FILE_SECCTX,
2371                                              RCL_SERVER,
2372                                              info->mti_mdt->mdt_max_ea_size);
2373                 } else {
2374                         req_capsule_set_size(pill, &RMF_FILE_SECCTX,
2375                                              RCL_SERVER, 0);
2376                 }
2377         }
2378
2379 }
2380
2381 static int mdt_reint_internal(struct mdt_thread_info *info,
2382                               struct mdt_lock_handle *lhc,
2383                               __u32 op)
2384 {
2385         struct req_capsule      *pill = info->mti_pill;
2386         struct mdt_body         *repbody;
2387         int                      rc = 0, rc2;
2388
2389         ENTRY;
2390
2391         rc = mdt_reint_unpack(info, op);
2392         if (rc != 0) {
2393                 CERROR("Can't unpack reint, rc %d\n", rc);
2394                 RETURN(err_serious(rc));
2395         }
2396
2397
2398         /* check if the file system is set to readonly. O_RDONLY open
2399          * is still allowed even the file system is set to readonly mode */
2400         if (mdt_rdonly(info->mti_exp) && !mdt_is_readonly_open(info, op))
2401                 RETURN(err_serious(-EROFS));
2402
2403         /* for replay (no_create) lmm is not needed, client has it already */
2404         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2405                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2406                                      DEF_REP_MD_SIZE);
2407
2408         /* llog cookies are always 0, the field is kept for compatibility */
2409         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2410                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
2411
2412         /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
2413          * by default. If the target object has more ACL entries, then
2414          * enlarge the buffer when necessary. */
2415         if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
2416                 req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
2417                                      LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
2418
2419         mdt_preset_secctx_size(info);
2420
2421         rc = req_capsule_server_pack(pill);
2422         if (rc != 0) {
2423                 CERROR("Can't pack response, rc %d\n", rc);
2424                 RETURN(err_serious(rc));
2425         }
2426
2427         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
2428                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
2429                 LASSERT(repbody);
2430                 repbody->mbo_eadatasize = 0;
2431                 repbody->mbo_aclsize = 0;
2432         }
2433
2434         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
2435
2436         /* for replay no cookkie / lmm need, because client have this already */
2437         if (info->mti_spec.no_create)
2438                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2439                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
2440
2441         rc = mdt_init_ucred_reint(info);
2442         if (rc)
2443                 GOTO(out_shrink, rc);
2444
2445         rc = mdt_fix_attr_ucred(info, op);
2446         if (rc != 0)
2447                 GOTO(out_ucred, rc = err_serious(rc));
2448
2449         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
2450         if (rc < 0) {
2451                 GOTO(out_ucred, rc);
2452         } else if (rc == 1) {
2453                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt");
2454                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
2455                 GOTO(out_ucred, rc);
2456         }
2457         rc = mdt_reint_rec(info, lhc);
2458         EXIT;
2459 out_ucred:
2460         mdt_exit_ucred(info);
2461 out_shrink:
2462         mdt_client_compatibility(info);
2463
2464         rc2 = mdt_fix_reply(info);
2465         if (rc == 0)
2466                 rc = rc2;
2467
2468         /*
2469          * Data-on-MDT optimization - read data along with OPEN and return it
2470          * in reply. Do that only if we have both DOM and LAYOUT locks.
2471          */
2472         if (rc == 0 && op == REINT_OPEN && !req_is_replay(pill->rc_req) &&
2473             info->mti_attr.ma_lmm != NULL &&
2474             mdt_lmm_dom_entry(info->mti_attr.ma_lmm) == LMM_DOM_ONLY) {
2475                 rc = mdt_dom_read_on_open(info, info->mti_mdt,
2476                                           &lhc->mlh_reg_lh);
2477         }
2478
2479         return rc;
2480 }
2481
2482 static long mdt_reint_opcode(struct ptlrpc_request *req,
2483                              const struct req_format **fmt)
2484 {
2485         struct mdt_device       *mdt;
2486         struct mdt_rec_reint    *rec;
2487         long                     opc;
2488
2489         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
2490         if (rec != NULL) {
2491                 opc = rec->rr_opcode;
2492                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
2493                 if (opc < REINT_MAX && fmt[opc] != NULL)
2494                         req_capsule_extend(&req->rq_pill, fmt[opc]);
2495                 else {
2496                         mdt = mdt_exp2dev(req->rq_export);
2497                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
2498                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
2499                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
2500                         opc = err_serious(-EFAULT);
2501                 }
2502         } else {
2503                 opc = err_serious(-EFAULT);
2504         }
2505         return opc;
2506 }
2507
2508 static int mdt_reint(struct tgt_session_info *tsi)
2509 {
2510         long opc;
2511         int  rc;
2512         static const struct req_format *reint_fmts[REINT_MAX] = {
2513                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
2514                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
2515                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
2516                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
2517                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
2518                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
2519                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
2520                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
2521                 [REINT_MIGRATE]  = &RQF_MDS_REINT_MIGRATE,
2522                 [REINT_RESYNC]   = &RQF_MDS_REINT_RESYNC,
2523         };
2524
2525         ENTRY;
2526
2527         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
2528         if (opc >= 0) {
2529                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2530                 /*
2531                  * No lock possible here from client to pass it to reint code
2532                  * path.
2533                  */
2534                 rc = mdt_reint_internal(info, NULL, opc);
2535                 mdt_thread_info_fini(info);
2536         } else {
2537                 rc = opc;
2538         }
2539
2540         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
2541         RETURN(rc);
2542 }
2543
2544 /* this should sync the whole device */
2545 int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
2546 {
2547         struct dt_device *dt = mdt->mdt_bottom;
2548         int rc;
2549         ENTRY;
2550
2551         rc = dt->dd_ops->dt_sync(env, dt);
2552         RETURN(rc);
2553 }
2554
2555 /* this should sync this object */
2556 static int mdt_object_sync(const struct lu_env *env, struct obd_export *exp,
2557                            struct mdt_object *mo)
2558 {
2559         int rc = 0;
2560
2561         ENTRY;
2562
2563         if (!mdt_object_exists(mo)) {
2564                 CWARN("%s: non existing object "DFID": rc = %d\n",
2565                       exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
2566                       -ESTALE);
2567                 RETURN(-ESTALE);
2568         }
2569
2570         if (S_ISREG(lu_object_attr(&mo->mot_obj))) {
2571                 struct lu_target *tgt = tgt_ses_info(env)->tsi_tgt;
2572                 dt_obj_version_t version;
2573
2574                 version = dt_version_get(env, mdt_obj2dt(mo));
2575                 if (version > tgt->lut_obd->obd_last_committed)
2576                         rc = mo_object_sync(env, mdt_object_child(mo));
2577         } else {
2578                 rc = mo_object_sync(env, mdt_object_child(mo));
2579         }
2580
2581         RETURN(rc);
2582 }
2583
2584 static int mdt_sync(struct tgt_session_info *tsi)
2585 {
2586         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2587         struct req_capsule      *pill = tsi->tsi_pill;
2588         struct mdt_body         *body;
2589         int                      rc;
2590
2591         ENTRY;
2592
2593         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
2594                 RETURN(err_serious(-ENOMEM));
2595
2596         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
2597                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
2598         } else {
2599                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
2600
2601                 if (unlikely(info->mti_object == NULL))
2602                         RETURN(-EPROTO);
2603
2604                 /* sync an object */
2605                 rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp,
2606                                      info->mti_object);
2607                 if (rc == 0) {
2608                         const struct lu_fid *fid;
2609                         struct lu_attr *la = &info->mti_attr.ma_attr;
2610
2611                         info->mti_attr.ma_need = MA_INODE;
2612                         info->mti_attr.ma_valid = 0;
2613                         rc = mdt_attr_get_complex(info, info->mti_object,
2614                                                   &info->mti_attr);
2615                         if (rc == 0) {
2616                                 body = req_capsule_server_get(pill,
2617                                                               &RMF_MDT_BODY);
2618                                 fid = mdt_object_fid(info->mti_object);
2619                                 mdt_pack_attr2body(info, body, la, fid);
2620                         }
2621                 }
2622                 mdt_thread_info_fini(info);
2623         }
2624         if (rc == 0)
2625                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2626
2627         RETURN(rc);
2628 }
2629
2630 static int mdt_data_sync(struct tgt_session_info *tsi)
2631 {
2632         struct mdt_thread_info *info;
2633         struct mdt_device *mdt = mdt_exp2dev(tsi->tsi_exp);
2634         struct ost_body *body = tsi->tsi_ost_body;
2635         struct ost_body *repbody;
2636         struct mdt_object *mo = NULL;
2637         struct md_attr *ma;
2638         int rc = 0;
2639
2640         ENTRY;
2641
2642         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
2643
2644         /* if no fid is specified then do nothing,
2645          * device sync is done via MDS_SYNC */
2646         if (fid_is_zero(&tsi->tsi_fid))
2647                 RETURN(0);
2648
2649         mo = mdt_object_find(tsi->tsi_env, mdt, &tsi->tsi_fid);
2650         if (IS_ERR(mo))
2651                 RETURN(PTR_ERR(mo));
2652
2653         rc = mdt_object_sync(tsi->tsi_env, tsi->tsi_exp, mo);
2654         if (rc)
2655                 GOTO(put, rc);
2656
2657         repbody->oa.o_oi = body->oa.o_oi;
2658         repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
2659
2660         info = tsi2mdt_info(tsi);
2661         ma = &info->mti_attr;
2662         ma->ma_need = MA_INODE;
2663         ma->ma_valid = 0;
2664         rc = mdt_attr_get_complex(info, mo, ma);
2665         if (rc == 0)
2666                 obdo_from_la(&repbody->oa, &ma->ma_attr, VALID_FLAGS);
2667         else
2668                 rc = 0;
2669         mdt_thread_info_fini(info);
2670
2671         EXIT;
2672 put:
2673         if (mo != NULL)
2674                 mdt_object_put(tsi->tsi_env, mo);
2675         return rc;
2676 }
2677
2678 /*
2679  * Handle quota control requests to consult current usage/limit, but also
2680  * to configure quota enforcement
2681  */
2682 static int mdt_quotactl(struct tgt_session_info *tsi)
2683 {
2684         struct obd_export       *exp  = tsi->tsi_exp;
2685         struct req_capsule      *pill = tsi->tsi_pill;
2686         struct obd_quotactl     *oqctl, *repoqc;
2687         int                      id, rc;
2688         struct mdt_device       *mdt = mdt_exp2dev(exp);
2689         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2690         struct lu_nodemap       *nodemap;
2691         ENTRY;
2692
2693         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2694         if (oqctl == NULL)
2695                 RETURN(err_serious(-EPROTO));
2696
2697         rc = req_capsule_server_pack(pill);
2698         if (rc)
2699                 RETURN(err_serious(rc));
2700
2701         nodemap = nodemap_get_from_exp(exp);
2702         if (IS_ERR(nodemap))
2703                 RETURN(PTR_ERR(nodemap));
2704
2705         switch (oqctl->qc_cmd) {
2706                 /* master quotactl */
2707         case Q_SETINFO:
2708         case Q_SETQUOTA:
2709         case LUSTRE_Q_SETDEFAULT:
2710                 if (!nodemap_can_setquota(nodemap))
2711                         GOTO(out_nodemap, rc = -EPERM);
2712                 /* fallthrough */
2713         case Q_GETINFO:
2714         case Q_GETQUOTA:
2715         case LUSTRE_Q_GETDEFAULT:
2716                 if (qmt == NULL)
2717                         GOTO(out_nodemap, rc = -EOPNOTSUPP);
2718                 /* slave quotactl */
2719                 /* fallthrough */
2720         case Q_GETOINFO:
2721         case Q_GETOQUOTA:
2722                 break;
2723         default:
2724                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2725                 GOTO(out_nodemap, rc = -EFAULT);
2726         }
2727
2728         id = oqctl->qc_id;
2729         switch (oqctl->qc_type) {
2730         case USRQUOTA:
2731                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2732                                     NODEMAP_CLIENT_TO_FS, id);
2733                 break;
2734         case GRPQUOTA:
2735                 id = nodemap_map_id(nodemap, NODEMAP_GID,
2736                                     NODEMAP_CLIENT_TO_FS, id);
2737                 break;
2738         case PRJQUOTA:
2739                 /* todo: check/map project id */
2740                 id = oqctl->qc_id;
2741                 break;
2742         default:
2743                 GOTO(out_nodemap, rc = -EOPNOTSUPP);
2744         }
2745         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2746         if (repoqc == NULL)
2747                 GOTO(out_nodemap, rc = err_serious(-EFAULT));
2748
2749         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA)
2750                 barrier_exit(tsi->tsi_tgt->lut_bottom);
2751
2752         if (oqctl->qc_id != id)
2753                 swap(oqctl->qc_id, id);
2754
2755         if (oqctl->qc_cmd == Q_SETINFO || oqctl->qc_cmd == Q_SETQUOTA) {
2756                 if (unlikely(!barrier_entry(tsi->tsi_tgt->lut_bottom)))
2757                         RETURN(-EINPROGRESS);
2758         }
2759
2760         switch (oqctl->qc_cmd) {
2761
2762         case Q_GETINFO:
2763         case Q_SETINFO:
2764         case Q_SETQUOTA:
2765         case Q_GETQUOTA:
2766         case LUSTRE_Q_SETDEFAULT:
2767         case LUSTRE_Q_GETDEFAULT:
2768                 /* forward quotactl request to QMT */
2769                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2770                 break;
2771
2772         case Q_GETOINFO:
2773         case Q_GETOQUOTA:
2774                 /* slave quotactl */
2775                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2776                                    oqctl);
2777                 break;
2778
2779         default:
2780                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2781                 GOTO(out_nodemap, rc = -EFAULT);
2782         }
2783
2784         if (oqctl->qc_id != id)
2785                 swap(oqctl->qc_id, id);
2786
2787         *repoqc = *oqctl;
2788
2789         EXIT;
2790
2791 out_nodemap:
2792         nodemap_putref(nodemap);
2793
2794         return rc;
2795 }
2796
2797 /** clone llog ctxt from child (mdd)
2798  * This allows remote llog (replicator) access.
2799  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2800  * context was originally set up, or we can handle them directly.
2801  * I choose the latter, but that means I need any llog
2802  * contexts set up by child to be accessable by the mdt.  So we clone the
2803  * context into our context list here.
2804  */
2805 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2806                                int idx)
2807 {
2808         struct md_device  *next = mdt->mdt_child;
2809         struct llog_ctxt *ctxt;
2810         int rc;
2811
2812         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2813                 return 0;
2814
2815         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2816         if (rc || ctxt == NULL) {
2817                 return 0;
2818         }
2819
2820         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2821         if (rc)
2822                 CERROR("Can't set mdt ctxt %d\n", rc);
2823
2824         return rc;
2825 }
2826
2827 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2828                                  struct mdt_device *mdt, int idx)
2829 {
2830         struct llog_ctxt *ctxt;
2831
2832         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2833         if (ctxt == NULL)
2834                 return 0;
2835         /* Put once for the get we just did, and once for the clone */
2836         llog_ctxt_put(ctxt);
2837         llog_ctxt_put(ctxt);
2838         return 0;
2839 }
2840
2841 /*
2842  * sec context handlers
2843  */
2844 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2845 {
2846         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2847
2848         return 0;
2849 }
2850
2851 /*
2852  * quota request handlers
2853  */
2854 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2855 {
2856         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2857         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2858         int                      rc;
2859         ENTRY;
2860
2861         if (qmt == NULL)
2862                 RETURN(err_serious(-EOPNOTSUPP));
2863
2864         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2865         RETURN(rc);
2866 }
2867
2868 struct mdt_object *mdt_object_new(const struct lu_env *env,
2869                                   struct mdt_device *d,
2870                                   const struct lu_fid *f)
2871 {
2872         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2873         struct lu_object *o;
2874         struct mdt_object *m;
2875         ENTRY;
2876
2877         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2878         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2879         if (unlikely(IS_ERR(o)))
2880                 m = (struct mdt_object *)o;
2881         else
2882                 m = mdt_obj(o);
2883         RETURN(m);
2884 }
2885
2886 struct mdt_object *mdt_object_find(const struct lu_env *env,
2887                                    struct mdt_device *d,
2888                                    const struct lu_fid *f)
2889 {
2890         struct lu_object *o;
2891         struct mdt_object *m;
2892         ENTRY;
2893
2894         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2895         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2896         if (unlikely(IS_ERR(o)))
2897                 m = (struct mdt_object *)o;
2898         else
2899                 m = mdt_obj(o);
2900
2901         RETURN(m);
2902 }
2903
2904 /**
2905  * Asyncronous commit for mdt device.
2906  *
2907  * Pass asynchonous commit call down the MDS stack.
2908  *
2909  * \param env environment
2910  * \param mdt the mdt device
2911  */
2912 static void mdt_device_commit_async(const struct lu_env *env,
2913                                     struct mdt_device *mdt)
2914 {
2915         struct dt_device *dt = mdt->mdt_bottom;
2916         int rc;
2917         ENTRY;
2918
2919         rc = dt->dd_ops->dt_commit_async(env, dt);
2920         if (unlikely(rc != 0))
2921                 CWARN("%s: async commit start failed: rc = %d\n",
2922                       mdt_obd_name(mdt), rc);
2923         atomic_inc(&mdt->mdt_async_commit_count);
2924         EXIT;
2925 }
2926
2927 /**
2928  * Mark the lock as "synchonous".
2929  *
2930  * Mark the lock to deffer transaction commit to the unlock time.
2931  *
2932  * \param lock the lock to mark as "synchonous"
2933  *
2934  * \see mdt_is_lock_sync
2935  * \see mdt_save_lock
2936  */
2937 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2938 {
2939         lock->l_ast_data = (void*)1;
2940 }
2941
2942 /**
2943  * Check whehter the lock "synchonous" or not.
2944  *
2945  * \param lock the lock to check
2946  * \retval 1 the lock is "synchonous"
2947  * \retval 0 the lock isn't "synchronous"
2948  *
2949  * \see mdt_set_lock_sync
2950  * \see mdt_save_lock
2951  */
2952 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2953 {
2954         return lock->l_ast_data != NULL;
2955 }
2956
2957 /**
2958  * Blocking AST for mdt locks.
2959  *
2960  * Starts transaction commit if in case of COS lock conflict or
2961  * deffers such a commit to the mdt_save_lock.
2962  *
2963  * \param lock the lock which blocks a request or cancelling lock
2964  * \param desc unused
2965  * \param data unused
2966  * \param flag indicates whether this cancelling or blocking callback
2967  * \retval 0
2968  * \see ldlm_blocking_ast_nocheck
2969  */
2970 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2971                      void *data, int flag)
2972 {
2973         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2974         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2975         struct ldlm_cb_set_arg *arg = data;
2976         bool commit_async = false;
2977         int rc;
2978         ENTRY;
2979
2980         if (flag == LDLM_CB_CANCELING)
2981                 RETURN(0);
2982
2983         lock_res_and_lock(lock);
2984         if (lock->l_blocking_ast != mdt_blocking_ast) {
2985                 unlock_res_and_lock(lock);
2986                 RETURN(0);
2987         }
2988
2989         /* A blocking ast may be sent from ldlm_lock_decref_internal
2990          * when the last reference to a local lock was released and
2991          * during blocking event from ldlm_work_bl_ast_lock().
2992          * The 'data' parameter is l_ast_data in the first case and
2993          * callback arguments in the second one. Distinguish them by that.
2994          */
2995         if (!data || data == lock->l_ast_data || !arg->bl_desc)
2996                 goto skip_cos_checks;
2997
2998         if (lock->l_req_mode & (LCK_PW | LCK_EX)) {
2999                 if (mdt_cos_is_enabled(mdt)) {
3000                         if (!arg->bl_desc->bl_same_client)
3001                                 mdt_set_lock_sync(lock);
3002                 } else if (mdt_slc_is_enabled(mdt) &&
3003                            arg->bl_desc->bl_cos_incompat) {
3004                         mdt_set_lock_sync(lock);
3005                         /*
3006                          * we may do extra commit here, but there is a small
3007                          * window to miss a commit: lock was unlocked (saved),
3008                          * then a conflict lock queued and we come here, but
3009                          * REP-ACK not received, so lock was not converted to
3010                          * COS mode yet.
3011                          * Fortunately this window is quite small, so the
3012                          * extra commit should be rare (not to say distributed
3013                          * operation is rare too).
3014                          */
3015                         commit_async = true;
3016                 }
3017         } else if (lock->l_req_mode == LCK_COS) {
3018                 commit_async = true;
3019         }
3020
3021 skip_cos_checks:
3022         rc = ldlm_blocking_ast_nocheck(lock);
3023
3024         if (commit_async) {
3025                 struct lu_env env;
3026
3027                 rc = lu_env_init(&env, LCT_LOCAL);
3028                 if (unlikely(rc != 0))
3029                         CWARN("%s: lu_env initialization failed, cannot "
3030                               "start asynchronous commit: rc = %d\n",
3031                               obd->obd_name, rc);
3032                 else
3033                         mdt_device_commit_async(&env, mdt);
3034                 lu_env_fini(&env);
3035         }
3036         RETURN(rc);
3037 }
3038
3039 /*
3040  * Blocking AST for cross-MDT lock
3041  *
3042  * Discard lock from uncommitted_slc_locks and cancel it.
3043  *
3044  * \param lock  the lock which blocks a request or cancelling lock
3045  * \param desc  unused
3046  * \param data  unused
3047  * \param flag  indicates whether this cancelling or blocking callback
3048  * \retval      0 on success
3049  * \retval      negative number on error
3050  */
3051 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
3052                             void *data, int flag)
3053 {
3054         int rc = 0;
3055         ENTRY;
3056
3057         switch (flag) {
3058         case LDLM_CB_BLOCKING: {
3059                 struct lustre_handle lockh;
3060
3061                 ldlm_lock2handle(lock, &lockh);
3062                 rc = ldlm_cli_cancel(&lockh,
3063                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
3064                 if (rc < 0) {
3065                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
3066                         RETURN(rc);
3067                 }
3068                 break;
3069         }
3070         case LDLM_CB_CANCELING: {
3071                 struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
3072                 struct mdt_device *mdt =
3073                                 mdt_dev(obd->obd_lu_dev->ld_site->ls_top_dev);
3074
3075                 LDLM_DEBUG(lock, "Revoke remote lock\n");
3076
3077                 /* discard slc lock here so that it can be cleaned anytime,
3078                  * especially for cleanup_resource() */
3079                 tgt_discard_slc_lock(&mdt->mdt_lut, lock);
3080
3081                 /* once we cache lock, l_ast_data is set to mdt_object */
3082                 if (lock->l_ast_data != NULL) {
3083                         struct mdt_object *mo = lock->l_ast_data;
3084                         struct lu_env env;
3085
3086                         rc = lu_env_init(&env, LCT_MD_THREAD);
3087                         if (unlikely(rc != 0)) {
3088                                 CWARN("%s: lu_env initialization failed, object"
3089                                       "%p "DFID" is leaked!\n",
3090                                       obd->obd_name, mo,
3091                                       PFID(mdt_object_fid(mo)));
3092                                 RETURN(rc);
3093                         }
3094
3095                         if (lock->l_policy_data.l_inodebits.bits &
3096                             (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)) {
3097                                 rc = mo_invalidate(&env, mdt_object_child(mo));
3098                                 mo->mot_cache_attr = 0;
3099                         }
3100                         mdt_object_put(&env, mo);
3101                         lu_env_fini(&env);
3102                 }
3103                 break;
3104         }
3105         default:
3106                 LBUG();
3107         }
3108
3109         RETURN(rc);
3110 }
3111
3112 int mdt_check_resent_lock(struct mdt_thread_info *info,
3113                           struct mdt_object *mo,
3114                           struct mdt_lock_handle *lhc)
3115 {
3116         /* the lock might already be gotten in ldlm_handle_enqueue() */
3117         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
3118                 struct ptlrpc_request *req = mdt_info_req(info);
3119                 struct ldlm_lock      *lock;
3120
3121                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
3122                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
3123                 if (lock == NULL) {
3124                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
3125                          * a resend case, however, it could be already destroyed
3126                          * due to client eviction or a raced cancel RPC. */
3127                         LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx",
3128                                           lhc->mlh_reg_lh.cookie);
3129                         RETURN(-ESTALE);
3130                 }
3131
3132                 if (!fid_res_name_eq(mdt_object_fid(mo),
3133                                      &lock->l_resource->lr_name)) {
3134                         CWARN("%s: Although resent, but still not "
3135                               "get child lock:"DFID"\n",
3136                               info->mti_exp->exp_obd->obd_name,
3137                               PFID(mdt_object_fid(mo)));
3138                         LDLM_LOCK_PUT(lock);
3139                         RETURN(-EPROTO);
3140                 }
3141                 LDLM_LOCK_PUT(lock);
3142                 return 0;
3143         }
3144         return 1;
3145 }
3146
3147 static void mdt_remote_object_lock_created_cb(struct ldlm_lock *lock)
3148 {
3149         mdt_object_get(NULL, lock->l_ast_data);
3150 }
3151
3152 int mdt_remote_object_lock_try(struct mdt_thread_info *mti,
3153                                struct mdt_object *o, const struct lu_fid *fid,
3154                                struct lustre_handle *lh, enum ldlm_mode mode,
3155                                __u64 *ibits, __u64 trybits, bool cache)
3156 {
3157         struct ldlm_enqueue_info *einfo = &mti->mti_remote_einfo;
3158         union ldlm_policy_data *policy = &mti->mti_policy;
3159         struct ldlm_res_id *res_id = &mti->mti_res_id;
3160         int rc = 0;
3161         ENTRY;
3162
3163         LASSERT(mdt_object_remote(o));
3164
3165         fid_build_reg_res_name(fid, res_id);
3166
3167         memset(einfo, 0, sizeof(*einfo));
3168         einfo->ei_type = LDLM_IBITS;
3169         einfo->ei_mode = mode;
3170         einfo->ei_cb_bl = mdt_remote_blocking_ast;
3171         einfo->ei_cb_cp = ldlm_completion_ast;
3172         einfo->ei_enq_slave = 0;
3173         einfo->ei_res_id = res_id;
3174
3175         if (cache) {
3176                 /*
3177                  * if we cache lock, couple lock with mdt_object, so that object
3178                  * can be easily found in lock ASTs.
3179                  */
3180                 einfo->ei_cbdata = o;
3181                 einfo->ei_cb_created = mdt_remote_object_lock_created_cb;
3182         }
3183
3184         memset(policy, 0, sizeof(*policy));
3185         policy->l_inodebits.bits = *ibits;
3186         policy->l_inodebits.try_bits = trybits;
3187
3188         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
3189                             policy);
3190
3191         /* Return successfully acquired bits to a caller */
3192         if (rc == 0) {
3193                 struct ldlm_lock *lock = ldlm_handle2lock(lh);
3194
3195                 LASSERT(lock);
3196                 *ibits = lock->l_policy_data.l_inodebits.bits;
3197                 LDLM_LOCK_PUT(lock);
3198         }
3199         RETURN(rc);
3200 }
3201
3202 int mdt_remote_object_lock(struct mdt_thread_info *mti, struct mdt_object *o,
3203                            const struct lu_fid *fid, struct lustre_handle *lh,
3204                            enum ldlm_mode mode, __u64 ibits, bool cache)
3205 {
3206         return mdt_remote_object_lock_try(mti, o, fid, lh, mode, &ibits, 0,
3207                                           cache);
3208 }
3209
3210 static int mdt_object_local_lock(struct mdt_thread_info *info,
3211                                  struct mdt_object *o,
3212                                  struct mdt_lock_handle *lh, __u64 *ibits,
3213                                  __u64 trybits, bool cos_incompat)
3214 {
3215         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
3216         union ldlm_policy_data *policy = &info->mti_policy;
3217         struct ldlm_res_id *res_id = &info->mti_res_id;
3218         __u64 dlmflags = 0, *cookie = NULL;
3219         int rc;
3220         ENTRY;
3221
3222         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
3223         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
3224         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
3225         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
3226
3227         if (cos_incompat) {
3228                 LASSERT(lh->mlh_reg_mode == LCK_PW ||
3229                         lh->mlh_reg_mode == LCK_EX);
3230                 dlmflags |= LDLM_FL_COS_INCOMPAT;
3231         } else if (mdt_cos_is_enabled(info->mti_mdt)) {
3232                 dlmflags |= LDLM_FL_COS_ENABLED;
3233         }
3234
3235         /* Only enqueue LOOKUP lock for remote object */
3236         LASSERT(ergo(mdt_object_remote(o), *ibits == MDS_INODELOCK_LOOKUP));
3237
3238         /* Lease lock are granted with LDLM_FL_CANCEL_ON_BLOCK */
3239         if (lh->mlh_type == MDT_REG_LOCK && lh->mlh_reg_mode == LCK_EX &&
3240             *ibits == MDS_INODELOCK_OPEN)
3241                 dlmflags |= LDLM_FL_CANCEL_ON_BLOCK;
3242
3243         if (lh->mlh_type == MDT_PDO_LOCK) {
3244                 /* check for exists after object is locked */
3245                 if (mdt_object_exists(o) == 0) {
3246                         /* Non-existent object shouldn't have PDO lock */
3247                         RETURN(-ESTALE);
3248                 } else {
3249                         /* Non-dir object shouldn't have PDO lock */
3250                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
3251                                 RETURN(-ENOTDIR);
3252                 }
3253         }
3254
3255         fid_build_reg_res_name(mdt_object_fid(o), res_id);
3256         dlmflags |= LDLM_FL_ATOMIC_CB;
3257
3258         if (info->mti_exp)
3259                 cookie = &info->mti_exp->exp_handle.h_cookie;
3260
3261         /*
3262          * Take PDO lock on whole directory and build correct @res_id for lock
3263          * on part of directory.
3264          */
3265         if (lh->mlh_pdo_hash != 0) {
3266                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
3267                 mdt_lock_pdo_mode(info, o, lh);
3268                 if (lh->mlh_pdo_mode != LCK_NL) {
3269                         /*
3270                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
3271                          * is never going to be sent to client and we do not
3272                          * want it slowed down due to possible cancels.
3273                          */
3274                         policy->l_inodebits.bits =
3275                                 *ibits & MDS_INODELOCK_UPDATE;
3276                         policy->l_inodebits.try_bits =
3277                                 trybits & MDS_INODELOCK_UPDATE;
3278                         /* at least one of them should be set */
3279                         LASSERT(policy->l_inodebits.bits |
3280                                 policy->l_inodebits.try_bits);
3281                         rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_pdo_lh,
3282                                           lh->mlh_pdo_mode, policy, res_id,
3283                                           dlmflags, cookie);
3284                         if (unlikely(rc != 0))
3285                                 GOTO(out_unlock, rc);
3286                 }
3287
3288                 /*
3289                  * Finish res_id initializing by name hash marking part of
3290                  * directory which is taking modification.
3291                  */
3292                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
3293         }
3294
3295         policy->l_inodebits.bits = *ibits;
3296         policy->l_inodebits.try_bits = trybits;
3297
3298         /*
3299          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
3300          * going to be sent to client. If it is - mdt_intent_policy() path will
3301          * fix it up and turn FL_LOCAL flag off.
3302          */
3303         rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_reg_lh, lh->mlh_reg_mode,
3304                           policy, res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
3305                           cookie);
3306 out_unlock:
3307         if (rc != 0)
3308                 mdt_object_unlock(info, o, lh, 1);
3309         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
3310                    lh->mlh_pdo_hash != 0 &&
3311                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
3312                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
3313
3314         /* Return successfully acquired bits to a caller */
3315         if (rc == 0) {
3316                 struct ldlm_lock *lock = ldlm_handle2lock(&lh->mlh_reg_lh);
3317
3318                 LASSERT(lock);
3319                 *ibits = lock->l_policy_data.l_inodebits.bits;
3320                 LDLM_LOCK_PUT(lock);
3321         }
3322         RETURN(rc);
3323 }
3324
3325 static int
3326 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
3327                          struct mdt_lock_handle *lh, __u64 *ibits,
3328                          __u64 trybits, bool cos_incompat)
3329 {
3330         struct mdt_lock_handle *local_lh = NULL;
3331         int rc;
3332         ENTRY;
3333
3334         if (!mdt_object_remote(o)) {
3335                 rc = mdt_object_local_lock(info, o, lh, ibits, trybits,
3336                                            cos_incompat);
3337                 RETURN(rc);
3338         }
3339
3340         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
3341         *ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
3342                     MDS_INODELOCK_XATTR);
3343
3344         /* Only enqueue LOOKUP lock for remote object */
3345         if (*ibits & MDS_INODELOCK_LOOKUP) {
3346                 __u64 local = MDS_INODELOCK_LOOKUP;
3347
3348                 rc = mdt_object_local_lock(info, o, lh, &local, 0,
3349                                            cos_incompat);
3350                 if (rc != ELDLM_OK)
3351                         RETURN(rc);
3352
3353                 local_lh = lh;
3354         }
3355
3356         if ((*ibits | trybits) & MDS_INODELOCK_UPDATE) {
3357                 /* Sigh, PDO needs to enqueue 2 locks right now, but
3358                  * enqueue RPC can only request 1 lock, to avoid extra
3359                  * RPC, so it will instead enqueue EX lock for remote
3360                  * object anyway XXX*/
3361                 if (lh->mlh_type == MDT_PDO_LOCK &&
3362                     lh->mlh_pdo_hash != 0) {
3363                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
3364                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
3365                                PFID(mdt_object_fid(o)));
3366                         lh->mlh_pdo_hash = 0;
3367                         lh->mlh_rreg_mode = LCK_EX;
3368                         lh->mlh_type = MDT_REG_LOCK;
3369                 }
3370
3371                 rc = mdt_remote_object_lock_try(info, o, mdt_object_fid(o),
3372                                                 &lh->mlh_rreg_lh,
3373                                                 lh->mlh_rreg_mode,
3374                                                 ibits, trybits, false);
3375                 if (rc != ELDLM_OK) {
3376                         if (local_lh != NULL)
3377                                 mdt_object_unlock(info, o, local_lh, rc);
3378                         RETURN(rc);
3379                 }
3380         }
3381
3382         /* other components like LFSCK can use lockless access
3383          * and populate cache, so we better invalidate it */
3384         mo_invalidate(info->mti_env, mdt_object_child(o));
3385
3386         RETURN(0);
3387 }
3388
3389 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
3390                     struct mdt_lock_handle *lh, __u64 ibits)
3391 {
3392         return mdt_object_lock_internal(info, o, lh, &ibits, 0, false);
3393 }
3394
3395 int mdt_reint_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
3396                           struct mdt_lock_handle *lh, __u64 ibits,
3397                           bool cos_incompat)
3398 {
3399         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
3400         return mdt_object_lock_internal(info, o, lh, &ibits, 0,
3401                                         cos_incompat);
3402 }
3403
3404 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
3405                         struct mdt_lock_handle *lh, __u64 *ibits,
3406                         __u64 trybits, bool cos_incompat)
3407 {
3408         bool trylock_only = *ibits == 0;
3409         int rc;
3410
3411         LASSERT(!(*ibits & trybits));
3412         rc = mdt_object_lock_internal(info, o, lh, ibits, trybits,
3413                                       cos_incompat);
3414         if (rc && trylock_only) { /* clear error for try ibits lock only */
3415                 LASSERT(*ibits == 0);
3416                 rc = 0;
3417         }
3418         return rc;
3419 }
3420
3421 /**
3422  * Save a lock within request object.
3423  *
3424  * Keep the lock referenced until whether client ACK or transaction
3425  * commit happens or release the lock immediately depending on input
3426  * parameters. If COS is ON, a write lock is converted to COS lock
3427  * before saving.
3428  *
3429  * \param info thead info object
3430  * \param h lock handle
3431  * \param mode lock mode
3432  * \param decref force immediate lock releasing
3433  */
3434 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
3435                    enum ldlm_mode mode, int decref)
3436 {
3437         ENTRY;
3438
3439         if (lustre_handle_is_used(h)) {
3440                 if (decref || !info->mti_has_trans ||
3441                     !(mode & (LCK_PW | LCK_EX))) {
3442                         mdt_fid_unlock(h, mode);
3443                 } else {
3444                         struct mdt_device *mdt = info->mti_mdt;
3445                         struct ldlm_lock *lock = ldlm_handle2lock(h);
3446                         struct ptlrpc_request *req = mdt_info_req(info);
3447                         bool cos = mdt_cos_is_enabled(mdt);
3448                         bool convert_lock = !cos && mdt_slc_is_enabled(mdt);
3449
3450                         LASSERTF(lock != NULL, "no lock for cookie %#llx\n",
3451                                  h->cookie);
3452
3453                         /* there is no request if mdt_object_unlock() is called
3454                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
3455                         if (likely(req != NULL)) {
3456                                 LDLM_DEBUG(lock, "save lock request %p reply "
3457                                         "state %p transno %lld\n", req,
3458                                         req->rq_reply_state, req->rq_transno);
3459                                 if (cos) {
3460                                         ldlm_lock_mode_downgrade(lock, LCK_COS);
3461                                         mode = LCK_COS;
3462                                 }
3463                                 if (req->rq_export->exp_disconnected)
3464                                         mdt_fid_unlock(h, mode);
3465                                 else
3466                                         ptlrpc_save_lock(req, h, mode, cos,
3467                                                          convert_lock);
3468                         } else {
3469                                 mdt_fid_unlock(h, mode);
3470                         }
3471                         if (mdt_is_lock_sync(lock)) {
3472                                 CDEBUG(D_HA, "found sync-lock,"
3473                                        " async commit started\n");
3474                                 mdt_device_commit_async(info->mti_env,
3475                                                         mdt);
3476                         }
3477                         LDLM_LOCK_PUT(lock);
3478                 }
3479                 h->cookie = 0ull;
3480         }
3481
3482         EXIT;
3483 }
3484
3485 /**
3486  * Save cross-MDT lock in uncommitted_slc_locks
3487  *
3488  * Keep the lock referenced until transaction commit happens or release the lock
3489  * immediately depending on input parameters.
3490  *
3491  * \param info thead info object
3492  * \param h lock handle
3493  * \param mode lock mode
3494  * \param decref force immediate lock releasing
3495  */
3496 static void mdt_save_remote_lock(struct mdt_thread_info *info,
3497                                  struct mdt_object *o, struct lustre_handle *h,
3498                                  enum ldlm_mode mode, int decref)
3499 {
3500         ENTRY;
3501
3502         if (lustre_handle_is_used(h)) {
3503                 struct ldlm_lock *lock = ldlm_handle2lock(h);
3504
3505                 if (o != NULL &&
3506                     (lock->l_policy_data.l_inodebits.bits &
3507                      (MDS_INODELOCK_XATTR | MDS_INODELOCK_UPDATE)))
3508                         mo_invalidate(info->mti_env, mdt_object_child(o));
3509
3510                 if (decref || !info->mti_has_trans ||
3511                     !(mode & (LCK_PW | LCK_EX))) {
3512                         ldlm_lock_decref_and_cancel(h, mode);
3513                         LDLM_LOCK_PUT(lock);
3514                 } else {
3515                         struct ptlrpc_request *req = mdt_info_req(info);
3516
3517                         LASSERT(req != NULL);
3518                         tgt_save_slc_lock(&info->mti_mdt->mdt_lut, lock,
3519                                           req->rq_transno);
3520                         ldlm_lock_decref(h, mode);
3521                 }
3522                 h->cookie = 0ull;
3523         }
3524
3525         EXIT;
3526 }
3527
3528 /**
3529  * Unlock mdt object.
3530  *
3531  * Immeditely release the regular lock and the PDO lock or save the
3532  * lock in request and keep them referenced until client ACK or
3533  * transaction commit.
3534  *
3535  * \param info thread info object
3536  * \param o mdt object
3537  * \param lh mdt lock handle referencing regular and PDO locks
3538  * \param decref force immediate lock releasing
3539  *
3540  * XXX o is not used and may be NULL, see hsm_cdt_request_completed().
3541  */
3542 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
3543                        struct mdt_lock_handle *lh, int decref)
3544 {
3545         ENTRY;
3546
3547         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
3548         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
3549         mdt_save_remote_lock(info, o, &lh->mlh_rreg_lh, lh->mlh_rreg_mode,
3550                              decref);
3551
3552         EXIT;
3553 }
3554
3555 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
3556                                         const struct lu_fid *f,
3557                                         struct mdt_lock_handle *lh,
3558                                         __u64 ibits)
3559 {
3560         struct mdt_object *o;
3561
3562         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
3563         if (!IS_ERR(o)) {
3564                 int rc;
3565
3566                 rc = mdt_object_lock(info, o, lh, ibits);
3567                 if (rc != 0) {
3568                         mdt_object_put(info->mti_env, o);
3569                         o = ERR_PTR(rc);
3570                 }
3571         }
3572         return o;
3573 }
3574
3575 void mdt_object_unlock_put(struct mdt_thread_info * info,
3576                            struct mdt_object * o,
3577                            struct mdt_lock_handle *lh,
3578                            int decref)
3579 {
3580         mdt_object_unlock(info, o, lh, decref);
3581         mdt_object_put(info->mti_env, o);
3582 }
3583
3584 /*
3585  * Generic code handling requests that have struct mdt_body passed in:
3586  *
3587  *  - extract mdt_body from request and save it in @info, if present;
3588  *
3589  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
3590  *  @info;
3591  *
3592  *  - if HAS_BODY flag is set for this request type check whether object
3593  *  actually exists on storage (lu_object_exists()).
3594  *
3595  */
3596 static int mdt_body_unpack(struct mdt_thread_info *info,
3597                            enum tgt_handler_flags flags)
3598 {
3599         const struct mdt_body    *body;
3600         struct mdt_object        *obj;
3601         const struct lu_env      *env;
3602         struct req_capsule       *pill;
3603         int                       rc;
3604         ENTRY;
3605
3606         env = info->mti_env;
3607         pill = info->mti_pill;
3608
3609         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
3610         if (body == NULL)
3611                 RETURN(-EFAULT);
3612
3613         if (!(body->mbo_valid & OBD_MD_FLID))
3614                 RETURN(0);
3615
3616         if (!fid_is_sane(&body->mbo_fid1)) {
3617                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
3618                 RETURN(-EINVAL);
3619         }
3620
3621         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
3622         if (!IS_ERR(obj)) {
3623                 if ((flags & HAS_BODY) && !mdt_object_exists(obj)) {
3624                         mdt_object_put(env, obj);
3625                         rc = -ENOENT;
3626                 } else {
3627                         info->mti_object = obj;
3628                         rc = 0;
3629                 }
3630         } else
3631                 rc = PTR_ERR(obj);
3632
3633         RETURN(rc);
3634 }
3635
3636 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info,
3637                                    enum tgt_handler_flags flags)
3638 {
3639         struct req_capsule *pill = info->mti_pill;
3640         int rc;
3641
3642         ENTRY;
3643
3644         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
3645                 rc = mdt_body_unpack(info, flags);
3646         else
3647                 rc = 0;
3648
3649         if (rc == 0 && (flags & HAS_REPLY)) {
3650                 /* Pack reply. */
3651                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
3652                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
3653                                              DEF_REP_MD_SIZE);
3654                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
3655                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
3656                                              RCL_SERVER, 0);
3657
3658                 /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
3659                  * by default. If the target object has more ACL entries, then
3660                  * enlarge the buffer when necessary. */
3661                 if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
3662                         req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
3663                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
3664
3665                 mdt_preset_secctx_size(info);
3666
3667                 rc = req_capsule_server_pack(pill);
3668                 if (rc)
3669                         CWARN("%s: cannot pack response: rc = %d\n",
3670                                       mdt_obd_name(info->mti_mdt), rc);
3671         }
3672         RETURN(rc);
3673 }
3674
3675 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
3676 {
3677         lh->mlh_type = MDT_NUL_LOCK;
3678         lh->mlh_reg_lh.cookie = 0ull;
3679         lh->mlh_reg_mode = LCK_MINMODE;
3680         lh->mlh_pdo_lh.cookie = 0ull;
3681         lh->mlh_pdo_mode = LCK_MINMODE;
3682         lh->mlh_rreg_lh.cookie = 0ull;
3683         lh->mlh_rreg_mode = LCK_MINMODE;
3684 }
3685
3686 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
3687 {
3688         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
3689         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
3690 }
3691
3692 /*
3693  * Initialize fields of struct mdt_thread_info. Other fields are left in
3694  * uninitialized state, because it's too expensive to zero out whole
3695  * mdt_thread_info (> 1K) on each request arrival.
3696  */
3697 void mdt_thread_info_init(struct ptlrpc_request *req,
3698                           struct mdt_thread_info *info)
3699 {
3700         int i;
3701
3702         info->mti_pill = &req->rq_pill;
3703
3704         /* lock handle */
3705         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3706                 mdt_lock_handle_init(&info->mti_lh[i]);
3707
3708         /* mdt device: it can be NULL while CONNECT */
3709         if (req->rq_export) {
3710                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
3711                 info->mti_exp = req->rq_export;
3712         } else
3713                 info->mti_mdt = NULL;
3714         info->mti_env = req->rq_svc_thread->t_env;
3715         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
3716
3717         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
3718         info->mti_big_buf = LU_BUF_NULL;
3719         info->mti_body = NULL;
3720         info->mti_object = NULL;
3721         info->mti_dlm_req = NULL;
3722         info->mti_has_trans = 0;
3723         info->mti_cross_ref = 0;
3724         info->mti_opdata = 0;
3725         info->mti_big_lmm_used = 0;
3726         info->mti_big_acl_used = 0;
3727         info->mti_som_valid = 0;
3728
3729         info->mti_spec.no_create = 0;
3730         info->mti_spec.sp_rm_entry = 0;
3731         info->mti_spec.sp_permitted = 0;
3732         info->mti_spec.sp_migrate_close = 0;
3733
3734         info->mti_spec.u.sp_ea.eadata = NULL;
3735         info->mti_spec.u.sp_ea.eadatalen = 0;
3736 }
3737
3738 void mdt_thread_info_fini(struct mdt_thread_info *info)
3739 {
3740         int i;
3741
3742         if (info->mti_object != NULL) {
3743                 mdt_object_put(info->mti_env, info->mti_object);
3744                 info->mti_object = NULL;
3745         }
3746
3747         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
3748                 mdt_lock_handle_fini(&info->mti_lh[i]);
3749         info->mti_env = NULL;
3750         info->mti_pill = NULL;
3751         info->mti_exp = NULL;
3752
3753         if (unlikely(info->mti_big_buf.lb_buf != NULL))
3754                 lu_buf_free(&info->mti_big_buf);
3755 }
3756
3757 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
3758 {
3759         struct mdt_thread_info  *mti;
3760
3761         mti = mdt_th_info(tsi->tsi_env);
3762         LASSERT(mti != NULL);
3763
3764         mdt_thread_info_init(tgt_ses_req(tsi), mti);
3765         if (tsi->tsi_corpus != NULL) {
3766                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
3767                 lu_object_get(tsi->tsi_corpus);
3768         }
3769         mti->mti_body = tsi->tsi_mdt_body;
3770         mti->mti_dlm_req = tsi->tsi_dlm_req;
3771
3772         return mti;
3773 }
3774
3775 static int mdt_tgt_connect(struct tgt_session_info *tsi)
3776 {
3777         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
3778             cfs_fail_val ==
3779             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
3780                 set_current_state(TASK_UNINTERRUPTIBLE);
3781                 schedule_timeout(cfs_time_seconds(3));
3782         }
3783
3784         return tgt_connect(tsi);
3785 }
3786
3787 static int mdt_intent_glimpse(enum ldlm_intent_flags it_opc,
3788                               struct mdt_thread_info *info,
3789                               struct ldlm_lock **lockp, __u64 flags)
3790 {
3791         return mdt_glimpse_enqueue(info, info->mti_mdt->mdt_namespace,
3792                                    lockp, flags);
3793 }
3794 static int mdt_intent_brw(enum ldlm_intent_flags it_opc,
3795                           struct mdt_thread_info *info,
3796                           struct ldlm_lock **lockp, __u64 flags)
3797 {
3798         return mdt_brw_enqueue(info, info->mti_mdt->mdt_namespace,
3799                                lockp, flags);
3800 }
3801
3802 int mdt_intent_lock_replace(struct mdt_thread_info *info,
3803                             struct ldlm_lock **lockp,
3804                             struct mdt_lock_handle *lh,
3805                             __u64 flags, int result)
3806 {
3807         struct ptlrpc_request  *req = mdt_info_req(info);
3808         struct ldlm_lock       *lock = *lockp;
3809         struct ldlm_lock       *new_lock;
3810
3811         /* If possible resent found a lock, @lh is set to its handle */
3812         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3813
3814         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3815                 lh->mlh_reg_lh.cookie = 0;
3816                 RETURN(0);
3817         }
3818
3819         if (new_lock == NULL && (flags & LDLM_FL_RESENT)) {
3820                 /* Lock is pinned by ldlm_handle_enqueue0() as it is
3821                  * a resend case, however, it could be already destroyed
3822                  * due to client eviction or a raced cancel RPC. */
3823                 LDLM_DEBUG_NOLOCK("Invalid lock handle %#llx\n",
3824                                   lh->mlh_reg_lh.cookie);
3825                 lh->mlh_reg_lh.cookie = 0;
3826                 RETURN(-ESTALE);
3827         }
3828
3829         LASSERTF(new_lock != NULL,
3830                  "lockh %#llx flags %#llx : rc = %d\n",
3831                  lh->mlh_reg_lh.cookie, flags, result);
3832
3833         /*
3834          * If we've already given this lock to a client once, then we should
3835          * have no readers or writers.  Otherwise, we should have one reader
3836          * _or_ writer ref (which will be zeroed below) before returning the
3837          * lock to a client.
3838          */
3839         if (new_lock->l_export == req->rq_export) {
3840                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3841         } else {
3842                 LASSERT(new_lock->l_export == NULL);
3843                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3844         }
3845
3846         *lockp = new_lock;
3847
3848         if (new_lock->l_export == req->rq_export) {
3849                 /*
3850                  * Already gave this to the client, which means that we
3851                  * reconstructed a reply.
3852                  */
3853                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3854                         MSG_RESENT);
3855
3856                 LDLM_LOCK_RELEASE(new_lock);
3857                 lh->mlh_reg_lh.cookie = 0;
3858                 RETURN(ELDLM_LOCK_REPLACED);
3859         }
3860
3861         /*
3862          * Fixup the lock to be given to the client.
3863          */
3864         lock_res_and_lock(new_lock);
3865         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3866          * possible blocking AST. */
3867         while (new_lock->l_readers > 0) {
3868                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3869                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3870                 new_lock->l_readers--;
3871         }
3872         while (new_lock->l_writers > 0) {
3873                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3874                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3875                 new_lock->l_writers--;
3876         }
3877
3878         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3879         new_lock->l_blocking_ast = lock->l_blocking_ast;
3880         new_lock->l_completion_ast = lock->l_completion_ast;
3881         if (ldlm_has_dom(new_lock))
3882                 new_lock->l_glimpse_ast = ldlm_server_glimpse_ast;
3883         new_lock->l_remote_handle = lock->l_remote_handle;
3884         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3885
3886         unlock_res_and_lock(new_lock);
3887
3888         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3889                      &new_lock->l_remote_handle,
3890                      &new_lock->l_exp_hash);
3891
3892         LDLM_LOCK_RELEASE(new_lock);
3893         lh->mlh_reg_lh.cookie = 0;
3894
3895         RETURN(ELDLM_LOCK_REPLACED);
3896 }
3897
3898 void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3899                              struct ldlm_lock *new_lock,
3900                              struct mdt_lock_handle *lh, __u64 flags)
3901 {
3902         struct ptlrpc_request  *req = mdt_info_req(info);
3903         struct ldlm_request    *dlmreq;
3904
3905         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3906                 return;
3907
3908         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3909
3910         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3911          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3912          * initialized. */
3913         if (flags & LDLM_FL_RESENT) {
3914                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3915                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3916
3917                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3918                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie %#llx",
3919                           lh->mlh_reg_lh.cookie);
3920                 return;
3921         }
3922
3923         /*
3924          * If the xid matches, then we know this is a resent request, and allow
3925          * it. (It's probably an OPEN, for which we don't send a lock.
3926          */
3927         if (req_can_reconstruct(req, NULL))
3928                 return;
3929
3930         /*
3931          * This remote handle isn't enqueued, so we never received or processed
3932          * this request.  Clear MSG_RESENT, because it can be handled like any
3933          * normal request now.
3934          */
3935         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3936
3937         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle %#llx",
3938                   dlmreq->lock_handle[0].cookie);
3939 }
3940
3941 static int mdt_intent_getxattr(enum ldlm_intent_flags it_opc,
3942                                struct mdt_thread_info *info,
3943                                struct ldlm_lock **lockp,
3944                                __u64 flags)
3945 {
3946         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3947         struct ldlm_reply      *ldlm_rep = NULL;
3948         int rc;
3949         ENTRY;
3950
3951         /*
3952          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3953          * (for the resend case) or a new lock. Below we will use it to
3954          * replace the original lock.
3955          */
3956         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3957         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3958                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3959                 rc = mdt_object_lock(info, info->mti_object, lhc,
3960                                      MDS_INODELOCK_XATTR);
3961                 if (rc)
3962                         return rc;
3963         }
3964
3965         rc = mdt_getxattr(info);
3966
3967         if (mdt_info_req(info)->rq_repmsg != NULL)
3968                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3969
3970         if (ldlm_rep == NULL ||
3971             OBD_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
3972                 mdt_object_unlock(info,  info->mti_object, lhc, 1);
3973                 if (is_serious(rc))
3974                         RETURN(rc);
3975                 else
3976                         RETURN(err_serious(-EFAULT));
3977         }
3978
3979         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3980
3981         /* This is left for interop instead of adding a new interop flag.
3982          * LU-7433 */
3983 #if LUSTRE_VERSION_CODE > OBD_OCD_VERSION(3, 0, 0, 0)
3984         if (ldlm_rep->lock_policy_res2) {
3985                 mdt_object_unlock(info, info->mti_object, lhc, 1);
3986                 RETURN(ELDLM_LOCK_ABORTED);
3987         }
3988 #endif
3989
3990         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
3991         RETURN(rc);
3992 }
3993
3994 static int mdt_intent_getattr(enum ldlm_intent_flags it_opc,
3995                               struct mdt_thread_info *info,
3996                               struct ldlm_lock **lockp,
3997                               __u64 flags)
3998 {
3999         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4000         __u64                   child_bits;
4001         struct ldlm_reply      *ldlm_rep;
4002         struct mdt_body        *reqbody;
4003         struct mdt_body        *repbody;
4004         int                     rc, rc2;
4005         ENTRY;
4006
4007         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
4008         LASSERT(reqbody);
4009
4010         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
4011         LASSERT(repbody);
4012
4013         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
4014         repbody->mbo_eadatasize = 0;
4015         repbody->mbo_aclsize = 0;
4016
4017         switch (it_opc) {
4018         case IT_LOOKUP:
4019                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
4020                 break;
4021         case IT_GETATTR:
4022                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
4023                              MDS_INODELOCK_PERM;
4024                 break;
4025         default:
4026                 CERROR("%s: unsupported intent %#x\n",
4027                        mdt_obd_name(info->mti_mdt), (unsigned int)it_opc);
4028                 GOTO(out_shrink, rc = -EINVAL);
4029         }
4030
4031         rc = mdt_init_ucred_intent_getattr(info, reqbody);
4032         if (rc)
4033                 GOTO(out_shrink, rc);
4034
4035         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4036         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
4037
4038         /* Get lock from request for possible resent case. */
4039         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4040
4041         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
4042         ldlm_rep->lock_policy_res2 = clear_serious(rc);
4043
4044         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
4045                 ldlm_rep->lock_policy_res2 = 0;
4046         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
4047             ldlm_rep->lock_policy_res2) {
4048                 lhc->mlh_reg_lh.cookie = 0ull;
4049                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
4050         }
4051
4052         rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4053         EXIT;
4054 out_ucred:
4055         mdt_exit_ucred(info);
4056 out_shrink:
4057         mdt_client_compatibility(info);
4058         rc2 = mdt_fix_reply(info);
4059         if (rc == 0)
4060                 rc = rc2;
4061         return rc;
4062 }
4063
4064 static int mdt_intent_layout(enum ldlm_intent_flags it_opc,
4065                              struct mdt_thread_info *info,
4066                              struct ldlm_lock **lockp,
4067                              __u64 flags)
4068 {
4069         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
4070         struct md_layout_change layout = { .mlc_opc = MD_LAYOUT_NOP };
4071         struct layout_intent *intent;
4072         struct lu_fid *fid = &info->mti_tmp_fid2;
4073         struct mdt_object *obj = NULL;
4074         int layout_size = 0;
4075         int rc = 0;
4076         ENTRY;
4077
4078         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
4079
4080         intent = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
4081         if (intent == NULL)
4082                 RETURN(-EPROTO);
4083
4084         CDEBUG(D_INFO, DFID "got layout change request from client: "
4085                "opc:%u flags:%#x extent "DEXT"\n",
4086                PFID(fid), intent->li_opc, intent->li_flags,
4087                PEXT(&intent->li_extent));
4088
4089         switch (intent->li_opc) {
4090         case LAYOUT_INTENT_TRUNC:
4091         case LAYOUT_INTENT_WRITE:
4092                 layout.mlc_opc = MD_LAYOUT_WRITE;
4093                 layout.mlc_intent = intent;
4094                 break;
4095         case LAYOUT_INTENT_ACCESS:
4096                 break;
4097         case LAYOUT_INTENT_READ:
4098         case LAYOUT_INTENT_GLIMPSE:
4099         case LAYOUT_INTENT_RELEASE:
4100         case LAYOUT_INTENT_RESTORE:
4101                 CERROR("%s: Unsupported layout intent opc %d\n",
4102                        mdt_obd_name(info->mti_mdt), intent->li_opc);
4103                 rc = -ENOTSUPP;
4104                 break;
4105         default:
4106                 CERROR("%s: Unknown layout intent opc %d\n",
4107                        mdt_obd_name(info->mti_mdt), intent->li_opc);
4108                 rc = -EINVAL;
4109                 break;
4110         }
4111         if (rc < 0)
4112                 RETURN(rc);
4113
4114         /* Get lock from request for possible resent case. */
4115         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4116
4117         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
4118         if (IS_ERR(obj))
4119                 GOTO(out, rc = PTR_ERR(obj));
4120
4121
4122         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
4123                 /* if layout is going to be changed don't use the current EA
4124                  * size but the maximum one. That buffer will be shrinked
4125                  * to the actual size in req_capsule_shrink() before reply.
4126                  */
4127                 if (layout.mlc_opc == MD_LAYOUT_WRITE) {
4128                         layout_size = info->mti_mdt->mdt_max_mdsize;
4129                 } else {
4130                         layout_size = mdt_attr_get_eabuf_size(info, obj);
4131                         if (layout_size < 0)
4132                                 GOTO(out_obj, rc = layout_size);
4133
4134                         if (layout_size > info->mti_mdt->mdt_max_mdsize)
4135                                 info->mti_mdt->mdt_max_mdsize = layout_size;
4136                 }
4137                 CDEBUG(D_INFO, "%s: layout_size %d\n",
4138                        mdt_obd_name(info->mti_mdt), layout_size);
4139         }
4140
4141         /*
4142          * set reply buffer size, so that ldlm_handle_enqueue0()->
4143          * ldlm_lvbo_fill() will fill the reply buffer with lovea.
4144          */
4145         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
4146         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
4147                              layout_size);
4148         rc = req_capsule_server_pack(info->mti_pill);
4149         if (rc)
4150                 GOTO(out_obj, rc);
4151
4152
4153         if (layout.mlc_opc != MD_LAYOUT_NOP) {
4154                 struct lu_buf *buf = &layout.mlc_buf;
4155
4156                 /**
4157                  * mdt_layout_change is a reint operation, when the request
4158                  * is resent, layout write shouldn't reprocess it again.
4159                  */
4160                 rc = mdt_check_resent(info, mdt_reconstruct_generic, lhc);
4161                 if (rc)
4162                         GOTO(out_obj, rc = rc < 0 ? rc : 0);
4163
4164                 /**
4165                  * There is another resent case: the client's job has been
4166                  * done by another client, referring lod_declare_layout_change
4167                  * -EALREADY case, and it became a operation w/o transaction,
4168                  * so we should not do the layout change, otherwise
4169                  * mdt_layout_change() will try to cancel the granted server
4170                  * CR lock whose remote counterpart is still in hold on the
4171                  * client, and a deadlock ensues.
4172                  */
4173                 rc = mdt_check_resent_lock(info, obj, lhc);
4174                 if (rc <= 0)
4175                         GOTO(out_obj, rc);
4176
4177                 buf->lb_buf = NULL;
4178                 buf->lb_len = 0;
4179                 if (unlikely(req_is_replay(mdt_info_req(info)))) {
4180                         buf->lb_buf = req_capsule_client_get(info->mti_pill,
4181                                         &RMF_EADATA);
4182                         buf->lb_len = req_capsule_get_size(info->mti_pill,
4183                                         &RMF_EADATA, RCL_CLIENT);
4184                         /*
4185                          * If it's a replay of layout write intent RPC, the
4186                          * client has saved the extended lovea when
4187                          * it get reply then.
4188                          */
4189                         if (buf->lb_len > 0)
4190                                 mdt_fix_lov_magic(info, buf->lb_buf);
4191                 }
4192                 /*
4193                  * Instantiate some layout components, if @buf contains
4194                  * lovea, then it's a replay of the layout intent write
4195                  * RPC.
4196                  */
4197                 rc = mdt_layout_change(info, obj, &layout);
4198                 if (rc)
4199                         GOTO(out_obj, rc);
4200         }
4201 out_obj:
4202         mdt_object_put(info->mti_env, obj);
4203
4204         if (rc == 0 && lustre_handle_is_used(&lhc->mlh_reg_lh))
4205                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4206
4207 out:
4208         lhc->mlh_reg_lh.cookie = 0;
4209
4210         RETURN(rc);
4211 }
4212
4213 static int mdt_intent_open(enum ldlm_intent_flags it_opc,
4214                            struct mdt_thread_info *info,
4215                            struct ldlm_lock **lockp,
4216                            __u64 flags)
4217 {
4218         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
4219         struct ldlm_reply      *rep = NULL;
4220         long                    opc;
4221         int                     rc;
4222
4223         static const struct req_format *intent_fmts[REINT_MAX] = {
4224                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
4225                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
4226         };
4227
4228         ENTRY;
4229
4230         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
4231         if (opc < 0)
4232                 RETURN(opc);
4233
4234         /* Get lock from request for possible resent case. */
4235         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
4236
4237         rc = mdt_reint_internal(info, lhc, opc);
4238
4239         /* Check whether the reply has been packed successfully. */
4240         if (mdt_info_req(info)->rq_repmsg != NULL)
4241                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4242         if (rep == NULL) {
4243                 if (is_serious(rc))
4244                         RETURN(rc);
4245                 else
4246                         RETURN(err_serious(-EFAULT));
4247         }
4248
4249         /* MDC expects this in any case */
4250         if (rc != 0)
4251                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
4252
4253         /* the open lock or the lock for cross-ref object should be
4254          * returned to the client */
4255         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
4256             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
4257                 rep->lock_policy_res2 = 0;
4258                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags, rc);
4259                 RETURN(rc);
4260         }
4261
4262         rep->lock_policy_res2 = clear_serious(rc);
4263
4264         if (rep->lock_policy_res2 == -ENOENT &&
4265             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
4266             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
4267                 rep->lock_policy_res2 = 0;
4268
4269         lhc->mlh_reg_lh.cookie = 0ull;
4270         if (rc == -ENOTCONN || rc == -ENODEV ||
4271             rc == -EOVERFLOW) { /**< if VBR failure then return error */
4272                 /*
4273                  * If it is the disconnect error (ENODEV & ENOCONN), the error
4274                  * will be returned by rq_status, and client at ptlrpc layer
4275                  * will detect this, then disconnect, reconnect the import
4276                  * immediately, instead of impacting the following the rpc.
4277                  */
4278                 RETURN(rc);
4279         }
4280         /*
4281          * For other cases, the error will be returned by intent, and client
4282          * will retrieve the result from intent.
4283          */
4284         RETURN(ELDLM_LOCK_ABORTED);
4285 }
4286
4287 static int mdt_intent_opc(enum ldlm_intent_flags it_opc,
4288                           struct mdt_thread_info *info,
4289                           struct ldlm_lock **lockp,
4290                           u64 flags /* LDLM_FL_* */)
4291 {
4292         struct req_capsule *pill = info->mti_pill;
4293         struct ptlrpc_request *req = mdt_info_req(info);
4294         const struct req_format *it_format;
4295         int (*it_handler)(enum ldlm_intent_flags,
4296                           struct mdt_thread_info *,
4297                           struct ldlm_lock **,
4298                           u64);
4299         enum tgt_handler_flags it_handler_flags = 0;
4300         struct ldlm_reply *rep;
4301         bool check_mdt_object = false;
4302         int rc;
4303         ENTRY;
4304
4305         switch (it_opc) {
4306         case IT_OPEN:
4307         case IT_OPEN|IT_CREAT:
4308                 /*
4309                  * OCREAT is not a IS_MUTABLE request since the file may
4310                  * already exist. We do the extra check of
4311                  * OBD_CONNECT_RDONLY in mdt_reint_open() when we
4312                  * really need to create the object.
4313                  */
4314                 it_format = &RQF_LDLM_INTENT;
4315                 it_handler = &mdt_intent_open;
4316                 break;
4317         case IT_GETATTR:
4318                 check_mdt_object = true;
4319         case IT_LOOKUP:
4320                 it_format = &RQF_LDLM_INTENT_GETATTR;
4321                 it_handler = &mdt_intent_getattr;
4322                 it_handler_flags = HAS_REPLY;
4323                 break;
4324         case IT_GETXATTR:
4325                 check_mdt_object = true;
4326                 it_format = &RQF_LDLM_INTENT_GETXATTR;
4327                 it_handler = &mdt_intent_getxattr;
4328                 it_handler_flags = HAS_BODY;
4329                 break;
4330         case IT_LAYOUT:
4331                 it_format = &RQF_LDLM_INTENT_LAYOUT;
4332                 it_handler = &mdt_intent_layout;
4333                 break;
4334         case IT_GLIMPSE:
4335                 it_format = &RQF_LDLM_INTENT;
4336                 it_handler = &mdt_intent_glimpse;
4337                 break;
4338         case IT_BRW:
4339                 it_format = &RQF_LDLM_INTENT;
4340                 it_handler = &mdt_intent_brw;
4341                 break;
4342         case IT_QUOTA_DQACQ:
4343         case IT_QUOTA_CONN: {
4344                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
4345
4346                 if (qmt == NULL)
4347                         RETURN(-EOPNOTSUPP);
4348
4349                 if (mdt_rdonly(req->rq_export))
4350                         RETURN(-EROFS);
4351
4352                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
4353                 /* pass the request to quota master */
4354                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
4355                                                  mdt_info_req(info), lockp,
4356                                                  flags);
4357                 RETURN(rc);
4358         }
4359         default:
4360                 CERROR("%s: unknown intent code %#x\n",
4361                        mdt_obd_name(info->mti_mdt), it_opc);
4362                 RETURN(-EPROTO);
4363         }
4364
4365         req_capsule_extend(pill, it_format);
4366
4367         rc = mdt_unpack_req_pack_rep(info, it_handler_flags);
4368         if (rc < 0)
4369                 RETURN(rc);
4370
4371         if (unlikely(info->mti_object == NULL && check_mdt_object))
4372                 RETURN(-EPROTO);
4373
4374         if (it_handler_flags & IS_MUTABLE && mdt_rdonly(req->rq_export))
4375                 RETURN(-EROFS);
4376
4377         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
4378
4379         /* execute policy */
4380         rc = (*it_handler)(it_opc, info, lockp, flags);
4381
4382         /* Check whether the reply has been packed successfully. */
4383         if (req->rq_repmsg != NULL) {
4384                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
4385                 rep->lock_policy_res2 =
4386                         ptlrpc_status_hton(rep->lock_policy_res2);
4387         }
4388
4389         RETURN(rc);
4390 }
4391
4392 static void mdt_ptlrpc_stats_update(struct ptlrpc_request *req,
4393                                     enum ldlm_intent_flags it_opc)
4394 {
4395         struct lprocfs_stats *srv_stats = ptlrpc_req2svc(req)->srv_stats;
4396
4397         /* update stats when IT code is known */
4398         if (srv_stats != NULL)
4399                 lprocfs_counter_incr(srv_stats,
4400                                 PTLRPC_LAST_CNTR + (it_opc == IT_GLIMPSE ?
4401                                 LDLM_GLIMPSE_ENQUEUE : LDLM_IBITS_ENQUEUE));
4402 }
4403
4404 static int mdt_intent_policy(const struct lu_env *env,
4405                              struct ldlm_namespace *ns,
4406                              struct ldlm_lock **lockp,
4407                              void *req_cookie,
4408                              enum ldlm_mode mode,
4409                              __u64 flags, void *data)
4410 {
4411         struct tgt_session_info *tsi;
4412         struct mdt_thread_info  *info;
4413         struct ptlrpc_request   *req  =  req_cookie;
4414         struct ldlm_intent      *it;
4415         struct req_capsule      *pill;
4416         const struct ldlm_lock_desc *ldesc;
4417         int rc;
4418
4419         ENTRY;
4420
4421         LASSERT(req != NULL);
4422
4423         tsi = tgt_ses_info(env);
4424
4425         info = tsi2mdt_info(tsi);
4426         LASSERT(info != NULL);
4427         pill = info->mti_pill;
4428         LASSERT(pill->rc_req == req);
4429         ldesc = &info->mti_dlm_req->lock_desc;
4430
4431         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
4432                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
4433                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
4434                 if (it != NULL) {
4435                         mdt_ptlrpc_stats_update(req, it->opc);
4436                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
4437                         if (rc == 0)
4438                                 rc = ELDLM_OK;
4439
4440                         /* Lock without inodebits makes no sense and will oops
4441                          * later in ldlm. Let's check it now to see if we have
4442                          * ibits corrupted somewhere in mdt_intent_opc().
4443                          * The case for client miss to set ibits has been
4444                          * processed by others. */
4445                         LASSERT(ergo(ldesc->l_resource.lr_type == LDLM_IBITS,
4446                                 ldesc->l_policy_data.l_inodebits.bits != 0));
4447                 } else {
4448                         rc = err_serious(-EFAULT);
4449                 }
4450         } else {
4451                 /* No intent was provided */
4452                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
4453                 rc = req_capsule_server_pack(pill);
4454                 if (rc)
4455                         rc = err_serious(rc);
4456         }
4457         mdt_thread_info_fini(info);
4458         RETURN(rc);
4459 }
4460
4461 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
4462 {
4463         struct seq_server_site  *ss = mdt_seq_site(mdt);
4464
4465         if (ss->ss_node_id == 0)
4466                 return;
4467
4468         if (ss->ss_client_seq != NULL) {
4469                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4470                 ss->ss_client_seq->lcs_exp = NULL;
4471         }
4472
4473         if (ss->ss_server_fld != NULL) {
4474                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
4475                 ss->ss_server_fld->lsf_control_exp = NULL;
4476         }
4477 }
4478
4479 static void mdt_seq_fini_cli(struct mdt_device *mdt)
4480 {
4481         struct seq_server_site *ss = mdt_seq_site(mdt);
4482
4483         if (ss == NULL)
4484                 return;
4485
4486         if (ss->ss_server_seq != NULL)
4487                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
4488 }
4489
4490 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
4491 {
4492         mdt_seq_fini_cli(mdt);
4493         mdt_deregister_seq_exp(mdt);
4494
4495         return seq_site_fini(env, mdt_seq_site(mdt));
4496 }
4497
4498 /**
4499  * It will retrieve its FLDB entries from MDT0, and it only happens
4500  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
4501  * and it needs to refresh FLDB from the MDT0.
4502  **/
4503 static int mdt_register_lwp_callback(void *data)
4504 {
4505         struct lu_env           env;
4506         struct mdt_device       *mdt = data;
4507         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
4508         int                     rc;
4509         ENTRY;
4510
4511         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
4512
4513         rc = lu_env_init(&env, LCT_MD_THREAD);
4514         if (rc < 0) {
4515                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
4516                 RETURN(rc);
4517         }
4518
4519         /* Allocate new sequence now to avoid creating local transaction
4520          * in the normal transaction process */
4521         rc = seq_server_check_and_alloc_super(&env,
4522                                               mdt_seq_site(mdt)->ss_server_seq);
4523         if (rc < 0)
4524                 GOTO(out, rc);
4525
4526         if (fld->lsf_new) {
4527                 rc = fld_update_from_controller(&env, fld);
4528                 if (rc != 0) {
4529                         CERROR("%s: cannot update controller: rc = %d\n",
4530                                mdt_obd_name(mdt), rc);
4531                         GOTO(out, rc);
4532                 }
4533         }
4534 out:
4535         lu_env_fini(&env);
4536         RETURN(rc);
4537 }
4538
4539 static int mdt_register_seq_exp(struct mdt_device *mdt)
4540 {
4541         struct seq_server_site  *ss = mdt_seq_site(mdt);
4542         char                    *lwp_name = NULL;
4543         int                     rc;
4544
4545         if (ss->ss_node_id == 0)
4546                 return 0;
4547
4548         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
4549         if (lwp_name == NULL)
4550                 GOTO(out_free, rc = -ENOMEM);
4551
4552         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
4553         if (rc != 0)
4554                 GOTO(out_free, rc);
4555
4556         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
4557                                       NULL, NULL);
4558         if (rc != 0)
4559                 GOTO(out_free, rc);
4560
4561         rc = lustre_register_lwp_item(lwp_name,
4562                                       &ss->ss_server_fld->lsf_control_exp,
4563                                       mdt_register_lwp_callback, mdt);
4564         if (rc != 0) {
4565                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
4566                 ss->ss_client_seq->lcs_exp = NULL;
4567                 GOTO(out_free, rc);
4568         }
4569 out_free:
4570         if (lwp_name != NULL)
4571                 OBD_FREE(lwp_name, MAX_OBD_NAME);
4572
4573         return rc;
4574 }
4575
4576 /*
4577  * Init client sequence manager which is used by local MDS to talk to sequence
4578  * controller on remote node.
4579  */
4580 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
4581 {
4582         struct seq_server_site  *ss = mdt_seq_site(mdt);
4583         int                     rc;
4584         char                    *prefix;
4585         ENTRY;
4586
4587         /* check if this is adding the first MDC and controller is not yet
4588          * initialized. */
4589         OBD_ALLOC_PTR(ss->ss_client_seq);
4590         if (ss->ss_client_seq == NULL)
4591                 RETURN(-ENOMEM);
4592
4593         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
4594         if (prefix == NULL) {
4595                 OBD_FREE_PTR(ss->ss_client_seq);
4596                 ss->ss_client_seq = NULL;
4597                 RETURN(-ENOMEM);
4598         }
4599
4600         /* Note: seq_client_fini will be called in seq_site_fini */
4601         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
4602         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
4603                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
4604                                                             NULL);
4605         OBD_FREE(prefix, MAX_OBD_NAME + 5);
4606         if (rc != 0) {
4607                 OBD_FREE_PTR(ss->ss_client_seq);
4608                 ss->ss_client_seq = NULL;
4609                 RETURN(rc);
4610         }
4611
4612         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
4613
4614         RETURN(rc);
4615 }
4616
4617 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
4618 {
4619         struct seq_server_site  *ss;
4620         int                     rc;
4621         ENTRY;
4622
4623         ss = mdt_seq_site(mdt);
4624         /* init sequence controller server(MDT0) */
4625         if (ss->ss_node_id == 0) {
4626                 OBD_ALLOC_PTR(ss->ss_control_seq);
4627                 if (ss->ss_control_seq == NULL)
4628                         RETURN(-ENOMEM);
4629
4630                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
4631                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
4632                                      ss);
4633                 if (rc)
4634                         GOTO(out_seq_fini, rc);
4635         }
4636
4637         /* Init normal sequence server */
4638         OBD_ALLOC_PTR(ss->ss_server_seq);
4639         if (ss->ss_server_seq == NULL)
4640                 GOTO(out_seq_fini, rc = -ENOMEM);
4641
4642         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
4643                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
4644         if (rc)
4645                 GOTO(out_seq_fini, rc);
4646
4647         /* init seq client for seq server to talk to seq controller(MDT0) */
4648         rc = mdt_seq_init_cli(env, mdt);
4649         if (rc != 0)
4650                 GOTO(out_seq_fini, rc);
4651
4652         if (ss->ss_node_id != 0)
4653                 /* register controller export through lwp */
4654                 rc = mdt_register_seq_exp(mdt);
4655
4656         EXIT;
4657 out_seq_fini:
4658         if (rc)
4659                 mdt_seq_fini(env, mdt);
4660
4661         return rc;
4662 }
4663
4664 /*
4665  * FLD wrappers
4666  */
4667 static int mdt_fld_fini(const struct lu_env *env,
4668                         struct mdt_device *m)
4669 {
4670         struct seq_server_site *ss = mdt_seq_site(m);
4671         ENTRY;
4672
4673         if (ss && ss->ss_server_fld) {
4674                 fld_server_fini(env, ss->ss_server_fld);
4675                 OBD_FREE_PTR(ss->ss_server_fld);
4676                 ss->ss_server_fld = NULL;
4677         }
4678
4679         RETURN(0);
4680 }
4681
4682 static int mdt_fld_init(const struct lu_env *env,
4683                         const char *uuid,
4684                         struct mdt_device *m)
4685 {
4686         struct seq_server_site *ss;
4687         int rc;
4688         ENTRY;
4689
4690         ss = mdt_seq_site(m);
4691
4692         OBD_ALLOC_PTR(ss->ss_server_fld);
4693         if (ss->ss_server_fld == NULL)
4694                 RETURN(rc = -ENOMEM);
4695
4696         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
4697                              LU_SEQ_RANGE_MDT);
4698         if (rc) {
4699                 OBD_FREE_PTR(ss->ss_server_fld);
4700                 ss->ss_server_fld = NULL;
4701                 RETURN(rc);
4702         }
4703
4704         RETURN(0);
4705 }
4706
4707 static void mdt_stack_pre_fini(const struct lu_env *env,
4708                            struct mdt_device *m, struct lu_device *top)
4709 {
4710         struct lustre_cfg_bufs  *bufs;
4711         struct lustre_cfg       *lcfg;
4712         struct mdt_thread_info  *info;
4713         ENTRY;
4714
4715         LASSERT(top);
4716
4717         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4718         LASSERT(info != NULL);
4719
4720         bufs = &info->mti_u.bufs;
4721
4722         LASSERT(m->mdt_child_exp);
4723         LASSERT(m->mdt_child_exp->exp_obd);
4724
4725         /* process cleanup, pass mdt obd name to get obd umount flags */
4726         /* XXX: this is needed because all layers are referenced by
4727          * objects (some of them are pinned by osd, for example *
4728          * the proper solution should be a model where object used
4729          * by osd only doesn't have mdt/mdd slices -bzzz */
4730         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4731         lustre_cfg_bufs_set_string(bufs, 1, NULL);
4732         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4733         if (!lcfg)
4734                 RETURN_EXIT;
4735         lustre_cfg_init(lcfg, LCFG_PRE_CLEANUP, bufs);
4736
4737         top->ld_ops->ldo_process_config(env, top, lcfg);
4738         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4739         EXIT;
4740 }
4741
4742 static void mdt_stack_fini(const struct lu_env *env,
4743                            struct mdt_device *m, struct lu_device *top)
4744 {
4745         struct obd_device       *obd = mdt2obd_dev(m);
4746         struct lustre_cfg_bufs  *bufs;
4747         struct lustre_cfg       *lcfg;
4748         struct mdt_thread_info  *info;
4749         char                     flags[3] = "";
4750         ENTRY;
4751
4752         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4753         LASSERT(info != NULL);
4754
4755         lu_dev_del_linkage(top->ld_site, top);
4756
4757         lu_site_purge(env, top->ld_site, -1);
4758
4759         bufs = &info->mti_u.bufs;
4760         /* process cleanup, pass mdt obd name to get obd umount flags */
4761         /* another purpose is to let all layers to release their objects */
4762         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
4763         if (obd->obd_force)
4764                 strcat(flags, "F");
4765         if (obd->obd_fail)
4766                 strcat(flags, "A");
4767         lustre_cfg_bufs_set_string(bufs, 1, flags);
4768         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4769         if (!lcfg)
4770                 RETURN_EXIT;
4771         lustre_cfg_init(lcfg, LCFG_CLEANUP, bufs);
4772
4773         LASSERT(top);
4774         top->ld_ops->ldo_process_config(env, top, lcfg);
4775         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4776
4777         lu_site_purge(env, top->ld_site, -1);
4778
4779         m->mdt_child = NULL;
4780         m->mdt_bottom = NULL;
4781
4782         obd_disconnect(m->mdt_child_exp);
4783         m->mdt_child_exp = NULL;
4784
4785         obd_disconnect(m->mdt_bottom_exp);
4786         m->mdt_child_exp = NULL;
4787 }
4788
4789 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
4790                                const char *next, struct obd_export **exp)
4791 {
4792         struct obd_connect_data *data = NULL;
4793         struct obd_device       *obd;
4794         int                      rc;
4795         ENTRY;
4796
4797         OBD_ALLOC_PTR(data);
4798         if (data == NULL)
4799                 GOTO(out, rc = -ENOMEM);
4800
4801         obd = class_name2obd(next);
4802         if (obd == NULL) {
4803                 CERROR("%s: can't locate next device: %s\n",
4804                        mdt_obd_name(m), next);
4805                 GOTO(out, rc = -ENOTCONN);
4806         }
4807
4808         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4809         data->ocd_version = LUSTRE_VERSION_CODE;
4810
4811         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
4812         if (rc) {
4813                 CERROR("%s: cannot connect to next dev %s (%d)\n",
4814                        mdt_obd_name(m), next, rc);
4815                 GOTO(out, rc);
4816         }
4817
4818 out:
4819         if (data)
4820                 OBD_FREE_PTR(data);
4821         RETURN(rc);
4822 }
4823
4824 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
4825                           struct lustre_cfg *cfg)
4826 {
4827         char                   *dev = lustre_cfg_string(cfg, 0);
4828         int                     rc, name_size, uuid_size;
4829         char                   *name, *uuid, *p;
4830         struct lustre_cfg_bufs *bufs;
4831         struct lustre_cfg      *lcfg;
4832         struct obd_device      *obd;
4833         struct lustre_profile  *lprof;
4834         struct lu_site         *site;
4835         ENTRY;
4836
4837         /* in 1.8 we had the only device in the stack - MDS.
4838          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
4839          * in 2.3 OSD is instantiated by obd_mount.c, so we need
4840          * to generate names and setup MDT, MDD. MDT will be using
4841          * generated name to connect to MDD. for MDD the next device
4842          * will be LOD with name taken from so called "profile" which
4843          * is generated by mount_option line
4844          *
4845          * 1.8 MGS generates config. commands like this:
4846          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
4847          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
4848          * 2.0 MGS generates config. commands like this:
4849          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
4850          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4851          *                    3:lustre-MDT0000-mdtlov  4:f
4852          *
4853          * we generate MDD name from MDT one, just replacing T with D
4854          *
4855          * after all the preparations, the logical equivalent will be
4856          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
4857          *                    3:lustre-MDT0000-mdtlov  4:f
4858          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4859          *                    3:lustre-MDD0000  4:f
4860          *
4861          *  notice we build the stack from down to top: MDD first, then MDT */
4862
4863         name_size = MAX_OBD_NAME;
4864         uuid_size = MAX_OBD_NAME;
4865
4866         OBD_ALLOC(name, name_size);
4867         OBD_ALLOC(uuid, uuid_size);
4868         if (name == NULL || uuid == NULL)
4869                 GOTO(cleanup_mem, rc = -ENOMEM);
4870
4871         OBD_ALLOC_PTR(bufs);
4872         if (!bufs)
4873                 GOTO(cleanup_mem, rc = -ENOMEM);
4874
4875         strcpy(name, dev);
4876         p = strstr(name, "-MDT");
4877         if (p == NULL)
4878                 GOTO(free_bufs, rc = -ENOMEM);
4879         p[3] = 'D';
4880
4881         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
4882
4883         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4884         if (lprof == NULL || lprof->lp_dt == NULL) {
4885                 CERROR("can't find the profile: %s\n",
4886                        lustre_cfg_string(cfg, 0));
4887                 GOTO(free_bufs, rc = -EINVAL);
4888         }
4889
4890         lustre_cfg_bufs_reset(bufs, name);
4891         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4892         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4893         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4894
4895         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4896         if (!lcfg)
4897                 GOTO(put_profile, rc = -ENOMEM);
4898         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
4899
4900         rc = class_attach(lcfg);
4901         if (rc)
4902                 GOTO(lcfg_cleanup, rc);
4903
4904         obd = class_name2obd(name);
4905         if (!obd) {
4906                 CERROR("Can not find obd %s (%s in config)\n",
4907                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4908                 GOTO(lcfg_cleanup, rc = -EINVAL);
4909         }
4910
4911         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4912
4913         lustre_cfg_bufs_reset(bufs, name);
4914         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4915         lustre_cfg_bufs_set_string(bufs, 2, dev);
4916         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4917
4918         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
4919         if (!lcfg)
4920                 GOTO(class_detach, rc = -ENOMEM);
4921         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
4922
4923         rc = class_setup(obd, lcfg);
4924         if (rc)
4925                 GOTO(class_detach, rc);
4926
4927         /* connect to MDD we just setup */
4928         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4929         if (rc)
4930                 GOTO(class_detach, rc);
4931
4932         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4933         LASSERT(site);
4934         LASSERT(mdt_lu_site(mdt) == NULL);
4935         mdt->mdt_lu_dev.ld_site = site;
4936         site->ls_top_dev = &mdt->mdt_lu_dev;
4937         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4938
4939         /* now connect to bottom OSD */
4940         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4941         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4942         if (rc)
4943                 GOTO(class_detach, rc);
4944         mdt->mdt_bottom =
4945                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4946
4947         rc = lu_env_refill((struct lu_env *)env);
4948         if (rc != 0)
4949                 CERROR("Failure to refill session: '%d'\n", rc);
4950
4951         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4952
4953         EXIT;
4954 class_detach:
4955         if (rc)
4956                 class_detach(obd, lcfg);
4957 lcfg_cleanup:
4958         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
4959 put_profile:
4960         class_put_profile(lprof);
4961 free_bufs:
4962         OBD_FREE_PTR(bufs);
4963 cleanup_mem:
4964         if (name)
4965                 OBD_FREE(name, name_size);
4966         if (uuid)
4967                 OBD_FREE(uuid, uuid_size);
4968         RETURN(rc);
4969 }
4970
4971 /* setup quota master target on MDT0 */
4972 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4973                           struct lustre_cfg *cfg)
4974 {
4975         struct obd_device       *obd;
4976         char                    *dev = lustre_cfg_string(cfg, 0);
4977         char                    *qmtname, *uuid, *p;
4978         struct lustre_cfg_bufs  *bufs;
4979         struct lustre_cfg       *lcfg;
4980         struct lustre_profile   *lprof;
4981         struct obd_connect_data *data;
4982         int                      rc;
4983         ENTRY;
4984
4985         LASSERT(mdt->mdt_qmt_exp == NULL);
4986         LASSERT(mdt->mdt_qmt_dev == NULL);
4987
4988         /* quota master is on MDT0 only for now */
4989         if (mdt->mdt_seq_site.ss_node_id != 0)
4990                 RETURN(0);
4991
4992         /* MGS generates config commands which look as follows:
4993          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4994          *                    3:lustre-MDT0000-mdtlov  4:f
4995          *
4996          * We generate the QMT name from the MDT one, just replacing MD with QM
4997          * after all the preparations, the logical equivalent will be:
4998          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4999          *                    3:lustre-MDT0000-osd  4:f */
5000         OBD_ALLOC(qmtname, MAX_OBD_NAME);
5001         OBD_ALLOC(uuid, UUID_MAX);
5002         OBD_ALLOC_PTR(bufs);
5003         OBD_ALLOC_PTR(data);
5004         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
5005                 GOTO(cleanup_mem, rc = -ENOMEM);
5006
5007         strcpy(qmtname, dev);
5008         p = strstr(qmtname, "-MDT");
5009         if (p == NULL)
5010                 GOTO(cleanup_mem, rc = -ENOMEM);
5011         /* replace MD with QM */
5012         p[1] = 'Q';
5013         p[2] = 'M';
5014
5015         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
5016
5017         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
5018         if (lprof == NULL || lprof->lp_dt == NULL) {
5019                 CERROR("can't find profile for %s\n",
5020                        lustre_cfg_string(cfg, 0));
5021                 GOTO(cleanup_mem, rc = -EINVAL);
5022         }
5023
5024         lustre_cfg_bufs_reset(bufs, qmtname);
5025         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
5026         lustre_cfg_bufs_set_string(bufs, 2, uuid);
5027         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
5028
5029         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5030         if (!lcfg)
5031                 GOTO(put_profile, rc = -ENOMEM);
5032         lustre_cfg_init(lcfg, LCFG_ATTACH, bufs);
5033
5034         rc = class_attach(lcfg);
5035         if (rc)
5036                 GOTO(lcfg_cleanup, rc);
5037
5038         obd = class_name2obd(qmtname);
5039         if (!obd) {
5040                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
5041                        lustre_cfg_string(cfg, 0));
5042                 GOTO(lcfg_cleanup, rc = -EINVAL);
5043         }
5044
5045         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5046
5047         lustre_cfg_bufs_reset(bufs, qmtname);
5048         lustre_cfg_bufs_set_string(bufs, 1, uuid);
5049         lustre_cfg_bufs_set_string(bufs, 2, dev);
5050
5051         /* for quota, the next device should be the OSD device */
5052         lustre_cfg_bufs_set_string(bufs, 3,
5053                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
5054
5055         OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen));
5056         if (!lcfg)
5057                 GOTO(class_detach, rc = -ENOMEM);
5058         lustre_cfg_init(lcfg, LCFG_SETUP, bufs);
5059
5060         rc = class_setup(obd, lcfg);
5061         if (rc)
5062                 GOTO(class_detach, rc);
5063
5064         mdt->mdt_qmt_dev = obd->obd_lu_dev;
5065
5066         /* configure local quota objects */
5067         if (OBD_FAIL_CHECK(OBD_FAIL_QUOTA_INIT))
5068                 rc = -EBADF;
5069         else
5070                 rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
5071                                                            &mdt->mdt_lu_dev,
5072                                                            mdt->mdt_qmt_dev);
5073         if (rc)
5074                 GOTO(class_cleanup, rc);
5075
5076         /* connect to quota master target */
5077         data->ocd_connect_flags = OBD_CONNECT_VERSION;
5078         data->ocd_version = LUSTRE_VERSION_CODE;
5079         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
5080                          data, NULL);
5081         if (rc) {
5082                 CERROR("cannot connect to quota master device %s (%d)\n",
5083                        qmtname, rc);
5084                 GOTO(class_cleanup, rc);
5085         }
5086
5087         EXIT;
5088 class_cleanup:
5089         if (rc) {
5090                 class_manual_cleanup(obd);
5091                 mdt->mdt_qmt_dev = NULL;
5092                 GOTO(lcfg_cleanup, rc);
5093         }
5094 class_detach:
5095         if (rc)
5096                 class_detach(obd, lcfg);
5097 lcfg_cleanup:
5098         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
5099 put_profile:
5100         class_put_profile(lprof);
5101 cleanup_mem:
5102         if (bufs)
5103                 OBD_FREE_PTR(bufs);
5104         if (qmtname)
5105                 OBD_FREE(qmtname, MAX_OBD_NAME);
5106         if (uuid)
5107                 OBD_FREE(uuid, UUID_MAX);
5108         if (data)
5109                 OBD_FREE_PTR(data);
5110         return rc;
5111 }
5112
5113 /* Shutdown quota master target associated with mdt */
5114 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
5115 {
5116         ENTRY;
5117
5118         if (mdt->mdt_qmt_exp == NULL)
5119                 RETURN_EXIT;
5120         LASSERT(mdt->mdt_qmt_dev != NULL);
5121
5122         /* the qmt automatically shuts down when the mdt disconnects */
5123         obd_disconnect(mdt->mdt_qmt_exp);
5124         mdt->mdt_qmt_exp = NULL;
5125         mdt->mdt_qmt_dev = NULL;
5126         EXIT;
5127 }
5128
5129 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
5130  * for now. This will be removed along with converting rest of MDT code
5131  * to use tgt_session_info */
5132 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
5133 {
5134         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5135         int                      rc;
5136
5137         if (unlikely(info->mti_object == NULL))
5138                 return -EPROTO;
5139
5140         rc = mdt_getxattr(info);
5141
5142         mdt_thread_info_fini(info);
5143         return rc;
5144 }
5145
5146 #define OBD_FAIL_OST_READ_NET   OBD_FAIL_OST_BRW_NET
5147 #define OBD_FAIL_OST_WRITE_NET  OBD_FAIL_OST_BRW_NET
5148 #define OST_BRW_READ    OST_READ
5149 #define OST_BRW_WRITE   OST_WRITE
5150
5151 static struct tgt_handler mdt_tgt_handlers[] = {
5152 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5153                 0,                      MDS_CONNECT,    mdt_tgt_connect,
5154                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
5155 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5156                 0,                      MDS_DISCONNECT, tgt_disconnect,
5157                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
5158 TGT_RPC_HANDLER(MDS_FIRST_OPC,
5159                 HAS_REPLY,              MDS_SET_INFO,   mdt_set_info,
5160                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
5161 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
5162 TGT_MDT_HDL(HAS_REPLY,          MDS_GET_ROOT,   mdt_get_root),
5163 TGT_MDT_HDL(HAS_BODY,           MDS_GETATTR,    mdt_getattr),
5164 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_GETATTR_NAME,
5165                                                         mdt_getattr_name),
5166 TGT_MDT_HDL(HAS_BODY,           MDS_GETXATTR,   mdt_tgt_getxattr),
5167 TGT_MDT_HDL(HAS_REPLY,          MDS_STATFS,     mdt_statfs),
5168 TGT_MDT_HDL(IS_MUTABLE,         MDS_REINT,      mdt_reint),
5169 TGT_MDT_HDL(HAS_BODY,           MDS_CLOSE,      mdt_close),
5170 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_READPAGE,   mdt_readpage),
5171 TGT_MDT_HDL(HAS_BODY | HAS_REPLY,       MDS_SYNC,       mdt_sync),
5172 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
5173 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_PROGRESS,
5174                                                         mdt_hsm_progress),
5175 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_REGISTER,
5176                                                         mdt_hsm_ct_register),
5177 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_UNREGISTER,
5178                                                         mdt_hsm_ct_unregister),
5179 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_STATE_GET,
5180                                                         mdt_hsm_state_get),
5181 TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_STATE_SET,
5182                                                         mdt_hsm_state_set),
5183 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_ACTION,       mdt_hsm_action),
5184 TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_REQUEST,
5185                                                         mdt_hsm_request),
5186 TGT_MDT_HDL(HAS_KEY | HAS_BODY | HAS_REPLY | IS_MUTABLE,
5187             MDS_SWAP_LAYOUTS,
5188             mdt_swap_layouts),
5189 TGT_MDT_HDL(IS_MUTABLE,         MDS_RMFID,      mdt_rmfid),
5190 };
5191
5192 static struct tgt_handler mdt_io_ops[] = {
5193 TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY, OST_BRW_READ, tgt_brw_read,
5194                                                         mdt_hp_brw),
5195 TGT_OST_HDL_HP(HAS_BODY | IS_MUTABLE,    OST_BRW_WRITE, tgt_brw_write,
5196                                                         mdt_hp_brw),
5197 TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY | IS_MUTABLE,
5198                                          OST_PUNCH,     mdt_punch_hdl,
5199                                                         mdt_hp_punch),
5200 TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_SYNC,     mdt_data_sync),
5201 };
5202
5203 static struct tgt_handler mdt_sec_ctx_ops[] = {
5204 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
5205 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
5206 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
5207 };
5208
5209 static struct tgt_handler mdt_quota_ops[] = {
5210 TGT_QUOTA_HDL(HAS_REPLY,                QUOTA_DQACQ,      mdt_quota_dqacq),
5211 };
5212
5213 static struct tgt_opc_slice mdt_common_slice[] = {
5214         {
5215                 .tos_opc_start  = MDS_FIRST_OPC,
5216                 .tos_opc_end    = MDS_LAST_OPC,
5217                 .tos_hs         = mdt_tgt_handlers
5218         },
5219         {
5220                 .tos_opc_start  = OBD_FIRST_OPC,
5221                 .tos_opc_end    = OBD_LAST_OPC,
5222                 .tos_hs         = tgt_obd_handlers
5223         },
5224         {
5225                 .tos_opc_start  = LDLM_FIRST_OPC,
5226                 .tos_opc_end    = LDLM_LAST_OPC,
5227                 .tos_hs         = tgt_dlm_handlers
5228         },
5229         {
5230                 .tos_opc_start  = SEC_FIRST_OPC,
5231                 .tos_opc_end    = SEC_LAST_OPC,
5232                 .tos_hs         = mdt_sec_ctx_ops
5233         },
5234         {
5235                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
5236                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
5237                 .tos_hs         = tgt_out_handlers
5238         },
5239         {
5240                 .tos_opc_start  = FLD_FIRST_OPC,
5241                 .tos_opc_end    = FLD_LAST_OPC,
5242                 .tos_hs         = fld_handlers
5243         },
5244         {
5245                 .tos_opc_start  = SEQ_FIRST_OPC,
5246                 .tos_opc_end    = SEQ_LAST_OPC,
5247                 .tos_hs         = seq_handlers
5248         },
5249         {
5250                 .tos_opc_start  = QUOTA_DQACQ,
5251                 .tos_opc_end    = QUOTA_LAST_OPC,
5252                 .tos_hs         = mdt_quota_ops
5253         },
5254         {
5255                 .tos_opc_start  = LLOG_FIRST_OPC,
5256                 .tos_opc_end    = LLOG_LAST_OPC,
5257                 .tos_hs         = tgt_llog_handlers
5258         },
5259         {
5260                 .tos_opc_start  = LFSCK_FIRST_OPC,
5261                 .tos_opc_end    = LFSCK_LAST_OPC,
5262                 .tos_hs         = tgt_lfsck_handlers
5263         },
5264         {
5265                 .tos_opc_start  = OST_FIRST_OPC,
5266                 .tos_opc_end    = OST_LAST_OPC,
5267                 .tos_hs         = mdt_io_ops
5268         },
5269         {
5270                 .tos_hs         = NULL
5271         }
5272 };
5273
5274 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
5275 {
5276         struct md_device *next = m->mdt_child;
5277         struct lu_device *d = &m->mdt_lu_dev;
5278         struct obd_device *obd = mdt2obd_dev(m);
5279         struct lfsck_stop stop;
5280
5281         ENTRY;
5282         stop.ls_status = LS_PAUSED;
5283         stop.ls_flags = 0;
5284         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
5285
5286         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
5287         ping_evictor_stop();
5288
5289         /* Remove the HSM /proc entry so the coordinator cannot be
5290          * restarted by a user while it's shutting down.
5291          */
5292         mdt_hsm_cdt_stop(m);
5293
5294         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
5295         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
5296
5297         if (m->mdt_namespace != NULL)
5298                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
5299                                           d->ld_obd->obd_force);
5300
5301         obd_exports_barrier(obd);
5302         obd_zombie_barrier();
5303
5304         mdt_quota_fini(env, m);
5305
5306         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
5307
5308         /* Calling the cleanup functions in the same order as in the mdt_init0
5309          * error path
5310          */
5311         mdt_tunables_fini(m);
5312
5313         target_recovery_fini(obd);
5314         upcall_cache_cleanup(m->mdt_identity_cache);
5315         m->mdt_identity_cache = NULL;
5316
5317         mdt_fs_cleanup(env, m);
5318
5319         tgt_fini(env, &m->mdt_lut);
5320
5321         mdt_hsm_cdt_fini(m);
5322
5323         if (m->mdt_los != NULL) {
5324                 local_oid_storage_fini(env, m->mdt_los);
5325                 m->mdt_los = NULL;
5326         }
5327
5328         if (m->mdt_namespace != NULL) {
5329                 ldlm_namespace_free_post(m->mdt_namespace);
5330                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
5331         }
5332
5333         if (m->mdt_md_root != NULL) {
5334                 mdt_object_put(env, m->mdt_md_root);
5335                 m->mdt_md_root = NULL;
5336         }
5337
5338         mdt_seq_fini(env, m);
5339
5340         mdt_fld_fini(env, m);
5341
5342         /*
5343          * Finish the stack
5344          */
5345         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
5346
5347         LASSERT(atomic_read(&d->ld_ref) == 0);
5348
5349         server_put_mount(mdt_obd_name(m), true);
5350
5351         EXIT;
5352 }
5353
5354 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
5355
5356 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
5357                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
5358 {
5359         const struct dt_device_param *dt_conf;
5360         struct mdt_thread_info *info;
5361         struct obd_device *obd;
5362         const char *dev = lustre_cfg_string(cfg, 0);
5363         const char *num = lustre_cfg_string(cfg, 2);
5364         struct tg_grants_data *tgd = &m->mdt_lut.lut_tgd;
5365         struct lustre_mount_info *lmi = NULL;
5366         struct lustre_sb_info *lsi;
5367         struct lu_site *s;
5368         struct seq_server_site *ss_site;
5369         const char *identity_upcall = "NONE";
5370         struct md_device *next;
5371         struct lu_fid fid;
5372         int rc;
5373         long node_id;
5374         mntopt_t mntopts;
5375         ENTRY;
5376
5377         lu_device_init(&m->mdt_lu_dev, ldt);
5378         /*
5379          * Environment (env) might be missing mdt_thread_key values at that
5380          * point, if device is allocated when mdt_thread_key is in QUIESCENT
5381          * mode.
5382          *
5383          * Usually device allocation path doesn't use module key values, but
5384          * mdt has to do a lot of work here, so allocate key value.
5385          */
5386         rc = lu_env_refill((struct lu_env *)env);
5387         if (rc != 0)
5388                 RETURN(rc);
5389
5390         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
5391         LASSERT(info != NULL);
5392
5393         obd = class_name2obd(dev);
5394         LASSERT(obd != NULL);
5395
5396         m->mdt_max_mdsize = MAX_MD_SIZE_OLD;
5397         m->mdt_opts.mo_evict_tgt_nids = 1;
5398         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
5399
5400         lmi = server_get_mount(dev);
5401         if (lmi == NULL) {
5402                 CERROR("Cannot get mount info for %s!\n", dev);
5403                 RETURN(-EFAULT);
5404         } else {
5405                 lsi = s2lsi(lmi->lmi_sb);
5406                 /* CMD is supported only in IAM mode */
5407                 LASSERT(num);
5408                 node_id = simple_strtol(num, NULL, 10);
5409                 obd->u.obt.obt_magic = OBT_MAGIC;
5410                 if (lsi->lsi_lmd != NULL &&
5411                     lsi->lsi_lmd->lmd_flags & LMD_FLG_SKIP_LFSCK)
5412                         m->mdt_skip_lfsck = 1;
5413         }
5414
5415         /* DoM files get IO lock at open by default */
5416         m->mdt_opts.mo_dom_lock = ALWAYS_DOM_LOCK_ON_OPEN;
5417         /* DoM files are read at open and data is packed in the reply */
5418         m->mdt_opts.mo_dom_read_open = 1;
5419
5420         m->mdt_squash.rsi_uid = 0;
5421         m->mdt_squash.rsi_gid = 0;
5422         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
5423         spin_lock_init(&m->mdt_squash.rsi_lock);
5424         spin_lock_init(&m->mdt_lock);
5425         m->mdt_enable_remote_dir = 1;
5426         m->mdt_enable_striped_dir = 1;
5427         m->mdt_enable_dir_migration = 1;
5428         m->mdt_enable_remote_dir_gid = 0;
5429         m->mdt_enable_remote_rename = 1;
5430
5431         atomic_set(&m->mdt_mds_mds_conns, 0);
5432         atomic_set(&m->mdt_async_commit_count, 0);
5433
5434         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
5435         m->mdt_lu_dev.ld_obd = obd;
5436         /* Set this lu_device to obd for error handling purposes. */
5437         obd->obd_lu_dev = &m->mdt_lu_dev;
5438
5439         /* init the stack */
5440         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
5441         if (rc) {
5442                 CERROR("%s: Can't init device stack, rc %d\n",
5443                        mdt_obd_name(m), rc);
5444                 GOTO(err_lmi, rc);
5445         }
5446
5447         s = mdt_lu_site(m);
5448         ss_site = mdt_seq_site(m);
5449         s->ld_seq_site = ss_site;
5450         ss_site->ss_lu = s;
5451
5452         /* set server index */
5453         ss_site->ss_node_id = node_id;
5454
5455         /* failover is the default
5456          * FIXME: we do not failout mds0/mgs, which may cause some problems.
5457          * assumed whose ss_node_id == 0 XXX
5458          * */
5459         obd->obd_replayable = 1;
5460         /* No connection accepted until configurations will finish */
5461         obd->obd_no_conn = 1;
5462
5463         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
5464                 char *str = lustre_cfg_string(cfg, 4);
5465                 if (strchr(str, 'n')) {
5466                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
5467                         obd->obd_replayable = 0;
5468                 }
5469         }
5470
5471         rc = mdt_fld_init(env, mdt_obd_name(m), m);
5472         if (rc)
5473                 GOTO(err_fini_stack, rc);
5474
5475         rc = mdt_seq_init(env, m);
5476         if (rc)
5477                 GOTO(err_fini_fld, rc);
5478
5479         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
5480                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
5481         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
5482                                               LDLM_NAMESPACE_SERVER,
5483                                               LDLM_NAMESPACE_GREEDY,
5484                                               LDLM_NS_TYPE_MDT);
5485         if (m->mdt_namespace == NULL)
5486                 GOTO(err_fini_seq, rc = -ENOMEM);
5487
5488         m->mdt_namespace->ns_lvbp = m;
5489         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
5490
5491         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
5492         /* set obd_namespace for compatibility with old code */
5493         obd->obd_namespace = m->mdt_namespace;
5494
5495         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
5496                       OBD_FAIL_MDS_ALL_REQUEST_NET,
5497                       OBD_FAIL_MDS_ALL_REPLY_NET);
5498         if (rc)
5499                 GOTO(err_free_ns, rc);
5500
5501         /* Amount of available space excluded from granting and reserved
5502          * for metadata. It is in percentage and 50% is default value. */
5503         tgd->tgd_reserved_pcnt = 50;
5504
5505         if (ONE_MB_BRW_SIZE < (1U << tgd->tgd_blockbits))
5506                 m->mdt_brw_size = 1U << tgd->tgd_blockbits;
5507         else
5508                 m->mdt_brw_size = ONE_MB_BRW_SIZE;
5509
5510         rc = mdt_fs_setup(env, m, obd, lsi);
5511         if (rc)
5512                 GOTO(err_tgt, rc);
5513
5514         fid.f_seq = FID_SEQ_LOCAL_NAME;
5515         fid.f_oid = 1;
5516         fid.f_ver = 0;
5517         rc = local_oid_storage_init(env, m->mdt_bottom, &fid, &m->mdt_los);
5518         if (rc != 0)
5519                 GOTO(err_fs_cleanup, rc);
5520
5521         rc = mdt_hsm_cdt_init(m);
5522         if (rc != 0) {
5523                 CERROR("%s: error initializing coordinator, rc %d\n",
5524                        mdt_obd_name(m), rc);
5525                 GOTO(err_los_fini, rc);
5526         }
5527
5528         tgt_adapt_sptlrpc_conf(&m->mdt_lut);
5529
5530         next = m->mdt_child;
5531         dt_conf = next->md_ops->mdo_dtconf_get(env, next);
5532
5533         mntopts = dt_conf->ddp_mntopts;
5534
5535         if (mntopts & MNTOPT_USERXATTR)
5536                 m->mdt_opts.mo_user_xattr = 1;
5537         else
5538                 m->mdt_opts.mo_user_xattr = 0;
5539
5540         m->mdt_max_ea_size = dt_conf->ddp_max_ea_size;
5541
5542         if (mntopts & MNTOPT_ACL)
5543                 m->mdt_opts.mo_acl = 1;
5544         else
5545                 m->mdt_opts.mo_acl = 0;
5546
5547         /* XXX: to support suppgid for ACL, we enable identity_upcall
5548          * by default, otherwise, maybe got unexpected -EACCESS. */
5549         if (m->mdt_opts.mo_acl)
5550                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
5551
5552         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
5553                                                 identity_upcall,
5554                                                 &mdt_identity_upcall_cache_ops);
5555         if (IS_ERR(m->mdt_identity_cache)) {
5556                 rc = PTR_ERR(m->mdt_identity_cache);
5557                 m->mdt_identity_cache = NULL;
5558                 GOTO(err_free_hsm, rc);
5559         }
5560
5561         rc = mdt_tunables_init(m, dev);
5562         if (rc) {
5563                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
5564                 GOTO(err_recovery, rc);
5565         }
5566
5567         rc = mdt_quota_init(env, m, cfg);
5568         if (rc)
5569                 GOTO(err_procfs, rc);
5570
5571         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
5572         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
5573                            "mdt_ldlm_client", m->mdt_ldlm_client);
5574
5575         ping_evictor_start();
5576
5577         /* recovery will be started upon mdt_prepare()
5578          * when the whole stack is complete and ready
5579          * to serve the requests */
5580
5581         /* Reduce the initial timeout on an MDS because it doesn't need such
5582          * a long timeout as an OST does. Adaptive timeouts will adjust this
5583          * value appropriately. */
5584         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
5585                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
5586
5587         RETURN(0);
5588 err_procfs:
5589         mdt_tunables_fini(m);
5590 err_recovery:
5591         upcall_cache_cleanup(m->mdt_identity_cache);
5592         m->mdt_identity_cache = NULL;
5593 err_free_hsm:
5594         mdt_hsm_cdt_fini(m);
5595 err_los_fini:
5596         local_oid_storage_fini(env, m->mdt_los);
5597         m->mdt_los = NULL;
5598 err_fs_cleanup:
5599         mdt_fs_cleanup(env, m);
5600 err_tgt:
5601         /* keep recoverable clients */
5602         obd->obd_fail = 1;
5603         target_recovery_fini(obd);
5604         obd_exports_barrier(obd);
5605         obd_zombie_barrier();
5606         tgt_fini(env, &m->mdt_lut);
5607 err_free_ns:
5608         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
5609         obd->obd_namespace = m->mdt_namespace = NULL;
5610 err_fini_seq:
5611         mdt_seq_fini(env, m);
5612 err_fini_fld:
5613         mdt_fld_fini(env, m);
5614 err_fini_stack:
5615         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
5616 err_lmi:
5617         if (lmi)
5618                 server_put_mount(dev, true);
5619         return(rc);
5620 }
5621
5622 /* For interoperability, the left element is old parameter, the right one
5623  * is the new version of the parameter, if some parameter is deprecated,
5624  * the new version should be set as NULL. */
5625 static struct cfg_interop_param mdt_interop_param[] = {
5626         { "mdt.group_upcall",   NULL },
5627         { "mdt.quota_type",     NULL },
5628         { "mdd.quota_type",     NULL },
5629         { "mdt.som",            NULL },
5630         { "mdt.rootsquash",     "mdt.root_squash" },
5631         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
5632         { NULL }
5633 };
5634
5635 /* used by MGS to process specific configurations */
5636 static int mdt_process_config(const struct lu_env *env,
5637                               struct lu_device *d, struct lustre_cfg *cfg)
5638 {
5639         struct mdt_device *m = mdt_dev(d);
5640         struct md_device *md_next = m->mdt_child;
5641         struct lu_device *next = md2lu_dev(md_next);
5642         int rc;
5643         ENTRY;
5644
5645         switch (cfg->lcfg_command) {
5646         case LCFG_PARAM: {
5647                 struct obd_device *obd = d->ld_obd;
5648                 /* For interoperability */
5649                 struct cfg_interop_param *ptr = NULL;
5650                 struct lustre_cfg *old_cfg = NULL;
5651                 char *param = NULL;
5652                 ssize_t count;
5653
5654                 param = lustre_cfg_string(cfg, 1);
5655                 if (param == NULL) {
5656                         CERROR("param is empty\n");
5657                         rc = -EINVAL;
5658                         break;
5659                 }
5660
5661                 ptr = class_find_old_param(param, mdt_interop_param);
5662                 if (ptr != NULL) {
5663                         if (ptr->new_param == NULL) {
5664                                 rc = 0;
5665                                 CWARN("For interoperability, skip this %s."
5666                                       " It is obsolete.\n", ptr->old_param);
5667                                 break;
5668                         }
5669
5670                         CWARN("Found old param %s, changed it to %s.\n",
5671                               ptr->old_param, ptr->new_param);
5672
5673                         old_cfg = cfg;
5674                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
5675                         if (IS_ERR(cfg)) {
5676                                 rc = PTR_ERR(cfg);
5677                                 break;
5678                         }
5679                 }
5680
5681                 count = class_modify_config(cfg, PARAM_MDT,
5682                                             &obd->obd_kset.kobj);
5683                 if (count < 0) {
5684                         struct coordinator *cdt = &m->mdt_coordinator;
5685
5686                         /* is it an HSM var ? */
5687                         count = class_modify_config(cfg, PARAM_HSM,
5688                                                     &cdt->cdt_hsm_kobj);
5689                         if (count < 0)
5690                                 /* we don't understand; pass it on */
5691                                 rc = next->ld_ops->ldo_process_config(env, next,
5692                                                                       cfg);
5693                         else
5694                                 rc = count > 0 ? 0 : count;
5695                 } else {
5696                         rc = count > 0 ? 0 : count;
5697                 }
5698
5699                 if (old_cfg)
5700                         OBD_FREE(cfg, lustre_cfg_len(cfg->lcfg_bufcount,
5701                                                      cfg->lcfg_buflens));
5702                 break;
5703         }
5704         default:
5705                 /* others are passed further */
5706                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
5707                 break;
5708         }
5709         RETURN(rc);
5710 }
5711
5712 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
5713                                           const struct lu_object_header *hdr,
5714                                           struct lu_device *d)
5715 {
5716         struct mdt_object *mo;
5717
5718         ENTRY;
5719
5720         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
5721         if (mo != NULL) {
5722                 struct lu_object *o;
5723                 struct lu_object_header *h;
5724
5725                 o = &mo->mot_obj;
5726                 h = &mo->mot_header;
5727                 lu_object_header_init(h);
5728                 lu_object_init(o, h, d);
5729                 lu_object_add_top(h, o);
5730                 o->lo_ops = &mdt_obj_ops;
5731                 spin_lock_init(&mo->mot_write_lock);
5732                 mutex_init(&mo->mot_som_mutex);
5733                 mutex_init(&mo->mot_lov_mutex);
5734                 init_rwsem(&mo->mot_dom_sem);
5735                 init_rwsem(&mo->mot_open_sem);
5736                 atomic_set(&mo->mot_open_count, 0);
5737                 RETURN(o);
5738         }
5739         RETURN(NULL);
5740 }
5741
5742 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
5743                            const struct lu_object_conf *unused)
5744 {
5745         struct mdt_device *d = mdt_dev(o->lo_dev);
5746         struct lu_device  *under;
5747         struct lu_object  *below;
5748         int                rc = 0;
5749         ENTRY;
5750
5751         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
5752                PFID(lu_object_fid(o)));
5753
5754         under = &d->mdt_child->md_lu_dev;
5755         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
5756         if (below != NULL) {
5757                 lu_object_add(o, below);
5758         } else
5759                 rc = -ENOMEM;
5760
5761         RETURN(rc);
5762 }
5763
5764 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
5765 {
5766         struct mdt_object *mo = mdt_obj(o);
5767         struct lu_object_header *h;
5768         ENTRY;
5769
5770         h = o->lo_header;
5771         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
5772                PFID(lu_object_fid(o)));
5773
5774         LASSERT(atomic_read(&mo->mot_open_count) == 0);
5775         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
5776
5777         lu_object_fini(o);
5778         lu_object_header_fini(h);
5779         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
5780
5781         EXIT;
5782 }
5783
5784 static int mdt_object_print(const struct lu_env *env, void *cookie,
5785                             lu_printer_t p, const struct lu_object *o)
5786 {
5787         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
5788
5789         return (*p)(env, cookie,
5790                     LUSTRE_MDT_NAME"-object@%p(%s %s, writecount=%d)",
5791                     mdto, mdto->mot_lov_created ? "lov_created" : "",
5792                     mdto->mot_cache_attr ? "cache_attr" : "",
5793                     mdto->mot_write_count);
5794 }
5795
5796 static int mdt_prepare(const struct lu_env *env,
5797                 struct lu_device *pdev,
5798                 struct lu_device *cdev)
5799 {
5800         struct mdt_device *mdt = mdt_dev(cdev);
5801         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
5802         struct obd_device *obd = cdev->ld_obd;
5803         int rc;
5804
5805         ENTRY;
5806
5807         LASSERT(obd);
5808
5809         rc = next->ld_ops->ldo_prepare(env, cdev, next);
5810         if (rc)
5811                 RETURN(rc);
5812
5813         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
5814         if (rc)
5815                 RETURN(rc);
5816
5817         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
5818         if (rc)
5819                 RETURN(rc);
5820
5821         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
5822         /* The LFSCK instance is registered just now, so it must be there when
5823          * register the namespace to such instance. */
5824         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
5825
5826         if (mdt->mdt_seq_site.ss_node_id == 0) {
5827                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
5828                                                          &mdt->mdt_md_root_fid);
5829                 if (rc)
5830                         RETURN(rc);
5831         }
5832
5833         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
5834
5835         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
5836         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
5837         LASSERT(obd->obd_no_conn);
5838         spin_lock(&obd->obd_dev_lock);
5839         obd->obd_no_conn = 0;
5840         spin_unlock(&obd->obd_dev_lock);
5841
5842         if (obd->obd_recovering == 0)
5843                 mdt_postrecov(env, mdt);
5844
5845         RETURN(rc);
5846 }
5847
5848 const struct lu_device_operations mdt_lu_ops = {
5849         .ldo_object_alloc   = mdt_object_alloc,
5850         .ldo_process_config = mdt_process_config,
5851         .ldo_prepare        = mdt_prepare,
5852 };
5853
5854 static const struct lu_object_operations mdt_obj_ops = {
5855         .loo_object_init    = mdt_object_init,
5856         .loo_object_free    = mdt_object_free,
5857         .loo_object_print   = mdt_object_print
5858 };
5859
5860 static int mdt_obd_set_info_async(const struct lu_env *env,
5861                                   struct obd_export *exp,
5862                                   __u32 keylen, void *key,
5863                                   __u32 vallen, void *val,
5864                                   struct ptlrpc_request_set *set)
5865 {
5866         int rc;
5867
5868         ENTRY;
5869
5870         if (KEY_IS(KEY_SPTLRPC_CONF)) {
5871                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp));
5872                 RETURN(rc);
5873         }
5874
5875         RETURN(0);
5876 }
5877
5878 /**
5879  * Match client and server connection feature flags.
5880  *
5881  * Compute the compatibility flags for a connection request based on
5882  * features mutually supported by client and server.
5883  *
5884  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
5885  * must not be updated here, otherwise a partially initialized value may
5886  * be exposed. After the connection request is successfully processed,
5887  * the top-level MDT connect request handler atomically updates the export
5888  * connect flags from the obd_connect_data::ocd_connect_flags field of the
5889  * reply. \see mdt_connect().
5890  *
5891  * Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
5892  * full struct obd_connect_data. So care must be taken when accessing fields
5893  * that are not present in struct obd_connect_data_v1. See LU-16.
5894  *
5895  * \param exp   the obd_export associated with this client/target pair
5896  * \param mdt   the target device for the connection
5897  * \param data  stores data for this connect request
5898  *
5899  * \retval 0       success
5900  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
5901  * \retval -EBADE  client and server feature requirements are incompatible
5902  */
5903 static int mdt_connect_internal(const struct lu_env *env,
5904                                 struct obd_export *exp,
5905                                 struct mdt_device *mdt,
5906                                 struct obd_connect_data *data, bool reconnect)
5907 {
5908         const char *obd_name = mdt_obd_name(mdt);
5909         LASSERT(data != NULL);
5910
5911         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
5912
5913         if (mdt->mdt_bottom->dd_rdonly &&
5914             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5915             !(data->ocd_connect_flags & OBD_CONNECT_RDONLY))
5916                 RETURN(-EACCES);
5917
5918         if (data->ocd_connect_flags & OBD_CONNECT_FLAGS2)
5919                 data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;
5920
5921         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
5922
5923         if (!mdt->mdt_opts.mo_acl)
5924                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
5925
5926         if (!mdt->mdt_opts.mo_user_xattr)
5927                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
5928
5929         if (OCD_HAS_FLAG(data, BRW_SIZE)) {
5930                 data->ocd_brw_size = min(data->ocd_brw_size,
5931                                          mdt->mdt_brw_size);
5932                 if (data->ocd_brw_size == 0) {
5933                         CERROR("%s: cli %s/%p ocd_connect_flags: %#llx "
5934                                "ocd_version: %x ocd_grant: %d ocd_index: %u "
5935                                "ocd_brw_size unexpectedly zero, network data "
5936                                "corruption? Refusing to connect this client\n",
5937                                obd_name, exp->exp_client_uuid.uuid,
5938                                exp, data->ocd_connect_flags, data->ocd_version,
5939                                data->ocd_grant, data->ocd_index);
5940                         return -EPROTO;
5941                 }
5942         }
5943
5944         if (OCD_HAS_FLAG(data, GRANT_PARAM)) {
5945                 struct dt_device_param *ddp = &mdt->mdt_lut.lut_dt_conf;
5946
5947                 /* client is reporting its page size, for future use */
5948                 exp->exp_target_data.ted_pagebits = data->ocd_grant_blkbits;
5949                 data->ocd_grant_blkbits  = mdt->mdt_lut.lut_tgd.tgd_blockbits;
5950                 /* ddp_inodespace may not be power-of-two value, eg. for ldiskfs
5951                  * it's LDISKFS_DIR_REC_LEN(20) = 28. */
5952                 data->ocd_grant_inobits = fls(ddp->ddp_inodespace - 1);
5953                 /* ocd_grant_tax_kb is in 1K byte blocks */
5954                 data->ocd_grant_tax_kb = ddp->ddp_extent_tax >> 10;
5955                 data->ocd_grant_max_blks = ddp->ddp_max_extent_blks;
5956         }
5957
5958         /* Save connect_data we have so far because tgt_grant_connect()
5959          * uses it to calculate grant, and we want to save the client
5960          * version before it is overwritten by LUSTRE_VERSION_CODE. */
5961         exp->exp_connect_data = *data;
5962         if (OCD_HAS_FLAG(data, GRANT))
5963                 tgt_grant_connect(env, exp, data, !reconnect);
5964
5965         if (OCD_HAS_FLAG(data, MAXBYTES))
5966                 data->ocd_maxbytes = mdt->mdt_lut.lut_dt_conf.ddp_maxbytes;
5967
5968         /* NB: Disregard the rule against updating
5969          * exp_connect_data.ocd_connect_flags in this case, since
5970          * tgt_client_new() needs to know if this is a lightweight
5971          * connection, and it is safe to expose this flag before
5972          * connection processing completes. */
5973         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5974                 spin_lock(&exp->exp_lock);
5975                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5976                 spin_unlock(&exp->exp_lock);
5977         }
5978
5979         data->ocd_version = LUSTRE_VERSION_CODE;
5980
5981         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5982                 CWARN("%s: MDS requires FID support, but client not\n",
5983                       obd_name);
5984                 return -EBADE;
5985         }
5986
5987         if (OCD_HAS_FLAG(data, PINGLESS)) {
5988                 if (ptlrpc_pinger_suppress_pings()) {
5989                         spin_lock(&exp->exp_obd->obd_dev_lock);
5990                         list_del_init(&exp->exp_obd_chain_timed);
5991                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5992                 } else {
5993                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5994                 }
5995         }
5996
5997         data->ocd_max_easize = mdt->mdt_max_ea_size;
5998
5999         /* NB: Disregard the rule against updating
6000          * exp_connect_data.ocd_connect_flags in this case, since
6001          * tgt_client_new() needs to know if this is client supports
6002          * multiple modify RPCs, and it is safe to expose this flag before
6003          * connection processing completes. */
6004         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
6005                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
6006                 spin_lock(&exp->exp_lock);
6007                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
6008                 spin_unlock(&exp->exp_lock);
6009         }
6010
6011         if (OCD_HAS_FLAG(data, CKSUM)) {
6012                 __u32 cksum_types = data->ocd_cksum_types;
6013
6014                 /* The client set in ocd_cksum_types the checksum types it
6015                  * supports. We have to mask off the algorithms that we don't
6016                  * support */
6017                 data->ocd_cksum_types &=
6018                         obd_cksum_types_supported_server(obd_name);
6019
6020                 if (unlikely(data->ocd_cksum_types == 0)) {
6021                         CERROR("%s: Connect with checksum support but no "
6022                                "ocd_cksum_types is set\n",
6023                                exp->exp_obd->obd_name);
6024                         RETURN(-EPROTO);
6025                 }
6026
6027                 CDEBUG(D_RPCTRACE, "%s: cli %s supports cksum type %x, return "
6028                        "%x\n", exp->exp_obd->obd_name, obd_export_nid2str(exp),
6029                        cksum_types, data->ocd_cksum_types);
6030         } else {
6031                 /* This client does not support OBD_CONNECT_CKSUM
6032                  * fall back to CRC32 */
6033                 CDEBUG(D_RPCTRACE, "%s: cli %s does not support "
6034                        "OBD_CONNECT_CKSUM, CRC32 will be used\n",
6035                        exp->exp_obd->obd_name, obd_export_nid2str(exp));
6036         }
6037
6038         return 0;
6039 }
6040
6041 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
6042                                    struct mdt_thread_info *info,
6043                                    struct mdt_file_data *mfd)
6044 {
6045         struct lu_context ses;
6046         int rc;
6047         ENTRY;
6048
6049         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
6050         if (rc)
6051                 RETURN(rc);
6052
6053         env->le_ses = &ses;
6054         lu_context_enter(&ses);
6055
6056         mdt_ucred(info)->uc_valid = UCRED_OLD;
6057         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
6058
6059         lu_context_exit(&ses);
6060         lu_context_fini(&ses);
6061         env->le_ses = NULL;
6062
6063         RETURN(rc);
6064 }
6065
6066 static int mdt_export_cleanup(struct obd_export *exp)
6067 {
6068         struct list_head         closing_list;
6069         struct mdt_export_data  *med = &exp->exp_mdt_data;
6070         struct obd_device       *obd = exp->exp_obd;
6071         struct mdt_device       *mdt;
6072         struct mdt_thread_info  *info;
6073         struct lu_env            env;
6074         struct mdt_file_data    *mfd, *n;
6075         int rc = 0;
6076         ENTRY;
6077
6078         INIT_LIST_HEAD(&closing_list);
6079         spin_lock(&med->med_open_lock);
6080         while (!list_empty(&med->med_open_head)) {
6081                 struct list_head *tmp = med->med_open_head.next;
6082                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
6083
6084                 /* Remove mfd handle so it can't be found again.
6085                  * We are consuming the mfd_list reference here. */
6086                 class_handle_unhash(&mfd->mfd_open_handle);
6087                 list_move_tail(&mfd->mfd_list, &closing_list);
6088         }
6089         spin_unlock(&med->med_open_lock);
6090         mdt = mdt_dev(obd->obd_lu_dev);
6091         LASSERT(mdt != NULL);
6092
6093         rc = lu_env_init(&env, LCT_MD_THREAD);
6094         if (rc)
6095                 RETURN(rc);
6096
6097         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6098         LASSERT(info != NULL);
6099         memset(info, 0, sizeof *info);
6100         info->mti_env = &env;
6101         info->mti_mdt = mdt;
6102         info->mti_exp = exp;
6103
6104         if (!list_empty(&closing_list)) {
6105                 struct md_attr *ma = &info->mti_attr;
6106
6107                 /* Close any open files (which may also cause orphan
6108                  * unlinking). */
6109                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
6110                         list_del_init(&mfd->mfd_list);
6111                         ma->ma_need = ma->ma_valid = 0;
6112
6113                         /* This file is being closed due to an eviction, it
6114                          * could have been modified and now dirty regarding to
6115                          * HSM archive, check this!
6116                          * The logic here is to mark a file dirty if there's a
6117                          * chance it was dirtied before the client was evicted,
6118                          * so that we don't have to wait for a release attempt
6119                          * before finding out the file was actually dirty and
6120                          * fail the release. Aggressively marking it dirty here
6121                          * will cause the policy engine to attempt to
6122                          * re-archive it; when rearchiving, we can compare the
6123                          * current version to the HSM data_version and make the
6124                          * archive request into a noop if it's not actually
6125                          * dirty.
6126                          */
6127                         if (mfd->mfd_open_flags & MDS_FMODE_WRITE)
6128                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
6129
6130                         /* Don't unlink orphan on failover umount, LU-184 */
6131                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
6132                                 ma->ma_valid = MA_FLAGS;
6133                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
6134                         }
6135                         ma->ma_valid |= MA_FORCE_LOG;
6136                         mdt_mfd_close(info, mfd);
6137                 }
6138         }
6139         info->mti_mdt = NULL;
6140         /* cleanup client slot early */
6141         /* Do not erase record for recoverable client. */
6142         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
6143                 tgt_client_del(&env, exp);
6144         lu_env_fini(&env);
6145
6146         RETURN(rc);
6147 }
6148
6149 static inline void mdt_enable_slc(struct mdt_device *mdt)
6150 {
6151         if (mdt->mdt_lut.lut_sync_lock_cancel == NEVER_SYNC_ON_CANCEL)
6152                 mdt->mdt_lut.lut_sync_lock_cancel = BLOCKING_SYNC_ON_CANCEL;
6153 }
6154
6155 static inline void mdt_disable_slc(struct mdt_device *mdt)
6156 {
6157         if (mdt->mdt_lut.lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL)
6158                 mdt->mdt_lut.lut_sync_lock_cancel = NEVER_SYNC_ON_CANCEL;
6159 }
6160
6161 static int mdt_obd_disconnect(struct obd_export *exp)
6162 {
6163         int rc;
6164
6165         ENTRY;
6166
6167         LASSERT(exp);
6168         class_export_get(exp);
6169
6170         if (!(exp->exp_flags & OBD_OPT_FORCE))
6171                 tgt_grant_sanity_check(exp->exp_obd, __func__);
6172
6173         if ((exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
6174             !(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)) {
6175                 struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
6176
6177                 if (atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
6178                         mdt_disable_slc(mdt);
6179         }
6180
6181         rc = server_disconnect_export(exp);
6182         if (rc != 0)
6183                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
6184
6185         tgt_grant_discard(exp);
6186
6187         rc = mdt_export_cleanup(exp);
6188         nodemap_del_member(exp);
6189         class_export_put(exp);
6190         RETURN(rc);
6191 }
6192
6193 /* mds_connect copy */
6194 static int mdt_obd_connect(const struct lu_env *env,
6195                            struct obd_export **exp, struct obd_device *obd,
6196                            struct obd_uuid *cluuid,
6197                            struct obd_connect_data *data,
6198                            void *localdata)
6199 {
6200         struct obd_export       *lexp;
6201         struct lustre_handle    conn = { 0 };
6202         struct mdt_device       *mdt;
6203         int                      rc;
6204         lnet_nid_t              *client_nid = localdata;
6205         ENTRY;
6206
6207         LASSERT(env != NULL);
6208         LASSERT(data != NULL);
6209
6210         if (!exp || !obd || !cluuid)
6211                 RETURN(-EINVAL);
6212
6213         mdt = mdt_dev(obd->obd_lu_dev);
6214
6215         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
6216             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
6217                 atomic_inc(&mdt->mdt_mds_mds_conns);
6218                 mdt_enable_slc(mdt);
6219         }
6220
6221         /*
6222          * first, check whether the stack is ready to handle requests
6223          * XXX: probably not very appropriate method is used now
6224          *      at some point we should find a better one
6225          */
6226         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
6227             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
6228             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
6229                 rc = obd_get_info(env, mdt->mdt_child_exp,
6230                                   sizeof(KEY_OSP_CONNECTED),
6231                                   KEY_OSP_CONNECTED, NULL, NULL);
6232                 if (rc)
6233                         RETURN(-EAGAIN);
6234                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
6235         }
6236
6237         rc = class_connect(&conn, obd, cluuid);
6238         if (rc)
6239                 RETURN(rc);
6240
6241         lexp = class_conn2export(&conn);
6242         LASSERT(lexp != NULL);
6243
6244         rc = nodemap_add_member(*client_nid, lexp);
6245         if (rc != 0 && rc != -EEXIST)
6246                 GOTO(out, rc);
6247
6248         rc = mdt_connect_internal(env, lexp, mdt, data, false);
6249         if (rc == 0) {
6250                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
6251
6252                 LASSERT(lcd);
6253                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
6254                 rc = tgt_client_new(env, lexp);
6255                 if (rc == 0)
6256                         mdt_export_stats_init(obd, lexp, localdata);
6257         }
6258 out:
6259         if (rc != 0) {
6260                 class_disconnect(lexp);
6261                 nodemap_del_member(lexp);
6262                 *exp = NULL;
6263         } else {
6264                 *exp = lexp;
6265                 /* Because we do not want this export to be evicted by pinger,
6266                  * let's not add this export to the timed chain list. */
6267                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
6268                         spin_lock(&lexp->exp_obd->obd_dev_lock);
6269                         list_del_init(&lexp->exp_obd_chain_timed);
6270                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
6271                 }
6272         }
6273
6274         RETURN(rc);
6275 }
6276
6277 static int mdt_obd_reconnect(const struct lu_env *env,
6278                              struct obd_export *exp, struct obd_device *obd,
6279                              struct obd_uuid *cluuid,
6280                              struct obd_connect_data *data,
6281                              void *localdata)
6282 {
6283         lnet_nid_t             *client_nid = localdata;
6284         int                     rc;
6285         ENTRY;
6286
6287         if (exp == NULL || obd == NULL || cluuid == NULL)
6288                 RETURN(-EINVAL);
6289
6290         rc = nodemap_add_member(*client_nid, exp);
6291         if (rc != 0 && rc != -EEXIST)
6292                 RETURN(rc);
6293
6294         rc = mdt_connect_internal(env, exp, mdt_dev(obd->obd_lu_dev), data,
6295                                   true);
6296         if (rc == 0)
6297                 mdt_export_stats_init(obd, exp, localdata);
6298         else
6299                 nodemap_del_member(exp);
6300
6301         RETURN(rc);
6302 }
6303
6304 /* FIXME: Can we avoid using these two interfaces? */
6305 static int mdt_init_export(struct obd_export *exp)
6306 {
6307         struct mdt_export_data *med = &exp->exp_mdt_data;
6308         int                     rc;
6309         ENTRY;
6310
6311         INIT_LIST_HEAD(&med->med_open_head);
6312         spin_lock_init(&med->med_open_lock);
6313         spin_lock(&exp->exp_lock);
6314         exp->exp_connecting = 1;
6315         spin_unlock(&exp->exp_lock);
6316
6317         /* self-export doesn't need client data and ldlm initialization */
6318         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
6319                                      &exp->exp_client_uuid)))
6320                 RETURN(0);
6321
6322         rc = tgt_client_alloc(exp);
6323         if (rc)
6324                 GOTO(err, rc);
6325
6326         rc = ldlm_init_export(exp);
6327         if (rc)
6328                 GOTO(err_free, rc);
6329
6330         RETURN(rc);
6331
6332 err_free:
6333         tgt_client_free(exp);
6334 err:
6335         CERROR("%s: Failed to initialize export: rc = %d\n",
6336                exp->exp_obd->obd_name, rc);
6337         return rc;
6338 }
6339
6340 static int mdt_destroy_export(struct obd_export *exp)
6341 {
6342         ENTRY;
6343
6344         target_destroy_export(exp);
6345         /* destroy can be called from failed obd_setup, so
6346          * checking uuid is safer than obd_self_export */
6347         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
6348                                      &exp->exp_client_uuid)))
6349                 RETURN(0);
6350
6351         ldlm_destroy_export(exp);
6352         tgt_client_free(exp);
6353
6354         LASSERT(list_empty(&exp->exp_outstanding_replies));
6355         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
6356
6357         /*
6358          * discard grants once we're sure no more
6359          * interaction with the client is possible
6360          */
6361         tgt_grant_discard(exp);
6362         if (exp_connect_flags(exp) & OBD_CONNECT_GRANT)
6363                 exp->exp_obd->u.obt.obt_lut->lut_tgd.tgd_tot_granted_clients--;
6364
6365         if (!(exp->exp_flags & OBD_OPT_FORCE))
6366                 tgt_grant_sanity_check(exp->exp_obd, __func__);
6367
6368         RETURN(0);
6369 }
6370
6371 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
6372                    struct linkea_data *ldata)
6373 {
6374         int rc;
6375
6376         LASSERT(ldata->ld_buf->lb_buf != NULL);
6377
6378         if (!mdt_object_exists(mdt_obj))
6379                 return -ENODATA;
6380
6381         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6382                           ldata->ld_buf, XATTR_NAME_LINK);
6383         if (rc == -ERANGE) {
6384                 /* Buf was too small, figure out what we need. */
6385                 lu_buf_free(ldata->ld_buf);
6386                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6387                                   ldata->ld_buf, XATTR_NAME_LINK);
6388                 if (rc < 0)
6389                         return rc;
6390                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
6391                 if (ldata->ld_buf->lb_buf == NULL)
6392                         return -ENOMEM;
6393                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6394                                   ldata->ld_buf, XATTR_NAME_LINK);
6395         }
6396         if (rc < 0)
6397                 return rc;
6398
6399         return linkea_init_with_rec(ldata);
6400 }
6401
6402 /**
6403  * Given an MDT object, try to look up the full path to the object.
6404  * Part of the MDT layer implementation of lfs fid2path.
6405  *
6406  * \param[in]     info  Per-thread common data shared by MDT level handlers.
6407  * \param[in]     obj   Object to do path lookup of
6408  * \param[in,out] fp    User-provided struct to store path information
6409  * \param[in]     root_fid Root FID of current path should reach
6410  *
6411  * \retval 0 Lookup successful, path information stored in fp
6412  * \retval -EAGAIN Lookup failed, usually because object is being moved
6413  * \retval negative errno if there was a problem
6414  */
6415 static int mdt_path_current(struct mdt_thread_info *info,
6416                             struct mdt_object *obj,
6417                             struct getinfo_fid2path *fp,
6418                             struct lu_fid *root_fid)
6419 {
6420         struct mdt_device       *mdt = info->mti_mdt;
6421         struct mdt_object       *mdt_obj;
6422         struct link_ea_header   *leh;
6423         struct link_ea_entry    *lee;
6424         struct lu_name          *tmpname = &info->mti_name;
6425         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
6426         struct lu_buf           *buf = &info->mti_big_buf;
6427         char                    *ptr;
6428         int                     reclen;
6429         struct linkea_data      ldata = { NULL };
6430         int                     rc = 0;
6431         bool                    first = true;
6432         ENTRY;
6433
6434         /* temp buffer for path element, the buffer will be finally freed
6435          * in mdt_thread_info_fini */
6436         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
6437         if (buf->lb_buf == NULL)
6438                 RETURN(-ENOMEM);
6439
6440         ldata.ld_buf = buf;
6441         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
6442         *ptr = 0;
6443         --ptr;
6444         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
6445
6446         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
6447                 struct lu_buf           lmv_buf;
6448
6449                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
6450                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
6451                         GOTO(out, rc = -ENOENT);
6452
6453                 if (lu_fid_eq(mdt_object_fid(obj), tmpfid)) {
6454                         mdt_obj = obj;
6455                         mdt_object_get(info->mti_env, mdt_obj);
6456                 } else {
6457                         mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
6458                         if (IS_ERR(mdt_obj))
6459                                 GOTO(out, rc = PTR_ERR(mdt_obj));
6460                 }
6461
6462                 if (!mdt_object_exists(mdt_obj)) {
6463                         mdt_object_put(info->mti_env, mdt_obj);
6464                         GOTO(out, rc = -ENOENT);
6465                 }
6466
6467                 if (mdt_object_remote(mdt_obj)) {
6468                         mdt_object_put(info->mti_env, mdt_obj);
6469                         GOTO(remote_out, rc = -EREMOTE);
6470                 }
6471
6472                 rc = mdt_links_read(info, mdt_obj, &ldata);
6473                 if (rc != 0) {
6474                         mdt_object_put(info->mti_env, mdt_obj);
6475                         GOTO(out, rc);
6476                 }
6477
6478                 leh = buf->lb_buf;
6479                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
6480                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
6481                 /* If set, use link #linkno for path lookup, otherwise use
6482                    link #0.  Only do this for the final path element. */
6483                 if (first && fp->gf_linkno < leh->leh_reccount) {
6484                         int count;
6485                         for (count = 0; count < fp->gf_linkno; count++) {
6486                                 lee = (struct link_ea_entry *)
6487                                      ((char *)lee + reclen);
6488                                 linkea_entry_unpack(lee, &reclen, tmpname,
6489                                                     tmpfid);
6490                         }
6491                         if (fp->gf_linkno < leh->leh_reccount - 1)
6492                                 /* indicate to user there are more links */
6493                                 fp->gf_linkno++;
6494                 }
6495
6496                 lmv_buf.lb_buf = info->mti_xattr_buf;
6497                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
6498                 /* Check if it is slave stripes */
6499                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
6500                                   &lmv_buf, XATTR_NAME_LMV);
6501                 mdt_object_put(info->mti_env, mdt_obj);
6502                 if (rc > 0) {
6503                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
6504
6505                         /* For slave stripes, get its master */
6506                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
6507                                 fp->gf_fid = *tmpfid;
6508                                 continue;
6509                         }
6510                 } else if (rc < 0 && rc != -ENODATA) {
6511                         GOTO(out, rc);
6512                 }
6513
6514                 rc = 0;
6515
6516                 /* Pack the name in the end of the buffer */
6517                 ptr -= tmpname->ln_namelen;
6518                 if (ptr - 1 <= fp->gf_u.gf_path)
6519                         GOTO(out, rc = -EOVERFLOW);
6520                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
6521                 *(--ptr) = '/';
6522
6523                 /* keep the last resolved fid to the client, so the
6524                  * client will build the left path on another MDT for
6525                  * remote object */
6526                 fp->gf_fid = *tmpfid;
6527
6528                 first = false;
6529         }
6530
6531 remote_out:
6532         ptr++; /* skip leading / */
6533         memmove(fp->gf_u.gf_path, ptr,
6534                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
6535
6536 out:
6537         RETURN(rc);
6538 }
6539
6540 /**
6541  * Given an MDT object, use mdt_path_current to get the path.
6542  * Essentially a wrapper to retry mdt_path_current a set number of times
6543  * if -EAGAIN is returned (usually because an object is being moved).
6544  *
6545  * Part of the MDT layer implementation of lfs fid2path.
6546  *
6547  * \param[in]     info  Per-thread common data shared by mdt level handlers.
6548  * \param[in]     obj   Object to do path lookup of
6549  * \param[in,out] fp    User-provided struct for arguments and to store path
6550  *                      information
6551  *
6552  * \retval 0 Lookup successful, path information stored in fp
6553  * \retval negative errno if there was a problem
6554  */
6555 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
6556                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
6557 {
6558         struct mdt_device       *mdt = info->mti_mdt;
6559         int                     tries = 3;
6560         int                     rc = -EAGAIN;
6561         ENTRY;
6562
6563         if (fp->gf_pathlen < 3)
6564                 RETURN(-EOVERFLOW);
6565
6566         if (root_fid == NULL)
6567                 root_fid = &mdt->mdt_md_root_fid;
6568
6569         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
6570                 fp->gf_u.gf_path[0] = '\0';
6571                 RETURN(0);
6572         }
6573
6574         /* Retry multiple times in case file is being moved */
6575         while (tries-- && rc == -EAGAIN)
6576                 rc = mdt_path_current(info, obj, fp, root_fid);
6577
6578         RETURN(rc);
6579 }
6580
6581 /**
6582  * Get the full path of the provided FID, as of changelog record recno.
6583  *
6584  * This checks sanity and looks up object for user provided FID
6585  * before calling the actual path lookup code.
6586  *
6587  * Part of the MDT layer implementation of lfs fid2path.
6588  *
6589  * \param[in]     info  Per-thread common data shared by mdt level handlers.
6590  * \param[in,out] fp    User-provided struct for arguments and to store path
6591  *                      information
6592  *
6593  * \retval 0 Lookup successful, path information and recno stored in fp
6594  * \retval -ENOENT, object does not exist
6595  * \retval negative errno if there was a problem
6596  */
6597 static int mdt_fid2path(struct mdt_thread_info *info,
6598                         struct lu_fid *root_fid,
6599                         struct getinfo_fid2path *fp)
6600 {
6601         struct mdt_device *mdt = info->mti_mdt;
6602         struct mdt_object *obj;
6603         int    rc;
6604         ENTRY;
6605
6606         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
6607                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
6608
6609         if (!fid_is_sane(&fp->gf_fid))
6610                 RETURN(-EINVAL);
6611
6612         if (!fid_is_namespace_visible(&fp->gf_fid)) {
6613                 CDEBUG(D_INFO, "%s: "DFID" is invalid, f_seq should be >= %#llx"
6614                        ", or f_oid != 0, or f_ver == 0\n", mdt_obd_name(mdt),
6615                        PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
6616                 RETURN(-EINVAL);
6617         }
6618
6619         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
6620         if (IS_ERR(obj)) {
6621                 rc = PTR_ERR(obj);
6622                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
6623                        PFID(&fp->gf_fid), rc);
6624                 RETURN(rc);
6625         }
6626
6627         if (mdt_object_remote(obj))
6628                 rc = -EREMOTE;
6629         else if (!mdt_object_exists(obj))
6630                 rc = -ENOENT;
6631         else
6632                 rc = 0;
6633
6634         if (rc < 0) {
6635                 mdt_object_put(info->mti_env, obj);
6636                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
6637                        PFID(&fp->gf_fid), rc);
6638                 RETURN(rc);
6639         }
6640
6641         rc = mdt_path(info, obj, fp, root_fid);
6642
6643         CDEBUG(D_INFO, "fid "DFID", path %s recno %#llx linkno %u\n",
6644                PFID(&fp->gf_fid), fp->gf_u.gf_path,
6645                fp->gf_recno, fp->gf_linkno);
6646
6647         mdt_object_put(info->mti_env, obj);
6648
6649         RETURN(rc);
6650 }
6651
6652 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
6653                             void *val, int vallen)
6654 {
6655         struct getinfo_fid2path *fpout, *fpin;
6656         struct lu_fid *root_fid = NULL;
6657         int rc = 0;
6658
6659         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
6660         fpout = val;
6661
6662         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6663                 lustre_swab_fid2path(fpin);
6664
6665         memcpy(fpout, fpin, sizeof(*fpin));
6666         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
6667                 RETURN(-EINVAL);
6668
6669         if (keylen >= cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*fpin) +
6670                       sizeof(struct lu_fid)) {
6671                 /* client sent its root FID, which is normally fileset FID */
6672                 root_fid = fpin->gf_u.gf_root_fid;
6673                 if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
6674                         lustre_swab_lu_fid(root_fid);
6675
6676                 if (root_fid != NULL && !fid_is_sane(root_fid))
6677                         RETURN(-EINVAL);
6678         }
6679
6680         rc = mdt_fid2path(info, root_fid, fpout);
6681         RETURN(rc);
6682 }
6683
6684 int mdt_get_info(struct tgt_session_info *tsi)
6685 {
6686         char    *key;
6687         int      keylen;
6688         __u32   *vallen;
6689         void    *valout;
6690         int      rc;
6691
6692         ENTRY;
6693
6694         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
6695         if (key == NULL) {
6696                 CDEBUG(D_IOCTL, "No GETINFO key\n");
6697                 RETURN(err_serious(-EFAULT));
6698         }
6699         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
6700                                       RCL_CLIENT);
6701
6702         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
6703         if (vallen == NULL) {
6704                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
6705                                 tgt_name(tsi->tsi_tgt));
6706                 RETURN(err_serious(-EFAULT));
6707         }
6708
6709         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
6710                              *vallen);
6711         rc = req_capsule_server_pack(tsi->tsi_pill);
6712         if (rc)
6713                 RETURN(err_serious(rc));
6714
6715         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
6716         if (valout == NULL) {
6717                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
6718                                 tgt_name(tsi->tsi_tgt));
6719                 RETURN(err_serious(-EFAULT));
6720         }
6721
6722         if (KEY_IS(KEY_FID2PATH)) {
6723                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
6724
6725                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
6726                 mdt_thread_info_fini(info);
6727         } else {
6728                 rc = -EINVAL;
6729         }
6730         RETURN(rc);
6731 }
6732
6733 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
6734 {
6735         struct obd_ioctl_data *data = karg;
6736         struct lu_fid *fid;
6737         __u64 version;
6738         struct mdt_object *obj;
6739         struct mdt_lock_handle  *lh;
6740         int rc;
6741         ENTRY;
6742
6743         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
6744             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
6745                 RETURN(-EINVAL);
6746
6747         fid = (struct lu_fid *)data->ioc_inlbuf1;
6748
6749         if (!fid_is_sane(fid))
6750                 RETURN(-EINVAL);
6751
6752         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
6753
6754         lh = &mti->mti_lh[MDT_LH_PARENT];
6755         mdt_lock_reg_init(lh, LCK_CR);
6756
6757         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
6758         if (IS_ERR(obj))
6759                 RETURN(PTR_ERR(obj));
6760
6761         if (mdt_object_remote(obj)) {
6762                 rc = -EREMOTE;
6763                 /**
6764                  * before calling version get the correct MDS should be
6765                  * fid, this is error to find remote object here
6766                  */
6767                 CERROR("nonlocal object "DFID"\n", PFID(fid));
6768         } else if (!mdt_object_exists(obj)) {
6769                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
6770                 rc = -ENOENT;
6771         } else {
6772                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
6773                *(__u64 *)data->ioc_inlbuf2 = version;
6774                 rc = 0;
6775         }
6776         mdt_object_unlock_put(mti, obj, lh, 1);
6777         RETURN(rc);
6778 }
6779
6780 /* ioctls on obd dev */
6781 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
6782                          void *karg, void __user *uarg)
6783 {
6784         struct lu_env      env;
6785         struct obd_device *obd = exp->exp_obd;
6786         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
6787         struct dt_device  *dt = mdt->mdt_bottom;
6788         int rc;
6789
6790         ENTRY;
6791         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
6792         rc = lu_env_init(&env, LCT_MD_THREAD);
6793         if (rc)
6794                 RETURN(rc);
6795
6796         switch (cmd) {
6797         case OBD_IOC_SYNC:
6798                 rc = mdt_device_sync(&env, mdt);
6799                 break;
6800         case OBD_IOC_SET_READONLY:
6801                 rc = dt_sync(&env, dt);
6802                 if (rc == 0)
6803                         rc = dt_ro(&env, dt);
6804                 break;
6805         case OBD_IOC_ABORT_RECOVERY:
6806                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
6807                 obd->obd_abort_recovery = 1;
6808                 target_stop_recovery_thread(obd);
6809                 rc = 0;
6810                 break;
6811         case OBD_IOC_CHANGELOG_REG:
6812         case OBD_IOC_CHANGELOG_DEREG:
6813         case OBD_IOC_CHANGELOG_CLEAR:
6814                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(&env,
6815                                                            mdt->mdt_child,
6816                                                            cmd, len, karg);
6817                 break;
6818         case OBD_IOC_START_LFSCK: {
6819                 struct md_device *next = mdt->mdt_child;
6820                 struct obd_ioctl_data *data = karg;
6821                 struct lfsck_start_param lsp;
6822
6823                 if (unlikely(data == NULL)) {
6824                         rc = -EINVAL;
6825                         break;
6826                 }
6827
6828                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
6829                 lsp.lsp_index_valid = 0;
6830                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
6831                 break;
6832         }
6833         case OBD_IOC_STOP_LFSCK: {
6834                 struct md_device        *next = mdt->mdt_child;
6835                 struct obd_ioctl_data   *data = karg;
6836                 struct lfsck_stop        stop;
6837
6838                 stop.ls_status = LS_STOPPED;
6839                 /* Old lfsck utils may pass NULL @stop. */
6840                 if (data->ioc_inlbuf1 == NULL)
6841                         stop.ls_flags = 0;
6842                 else
6843                         stop.ls_flags =
6844                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
6845
6846                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
6847                 break;
6848         }
6849         case OBD_IOC_QUERY_LFSCK: {
6850                 struct md_device        *next = mdt->mdt_child;
6851                 struct obd_ioctl_data   *data = karg;
6852
6853                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
6854                                                  data->ioc_inlbuf1);
6855                 break;
6856         }
6857         case OBD_IOC_GET_OBJ_VERSION: {
6858                 struct mdt_thread_info *mti;
6859                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6860                 memset(mti, 0, sizeof *mti);
6861                 mti->mti_env = &env;
6862                 mti->mti_mdt = mdt;
6863                 mti->mti_exp = exp;
6864
6865                 rc = mdt_ioc_version_get(mti, karg);
6866                 break;
6867         }
6868         case OBD_IOC_CATLOGLIST: {
6869                 struct mdt_thread_info *mti;
6870
6871                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
6872                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
6873                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
6874                                        &mti->mti_tmp_fid1);
6875                 break;
6876          }
6877         default:
6878                 rc = -EOPNOTSUPP;
6879                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
6880                         mdt_obd_name(mdt), cmd, rc);
6881         }
6882
6883         lu_env_fini(&env);
6884         RETURN(rc);
6885 }
6886
6887 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
6888 {
6889         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
6890         int rc;
6891         ENTRY;
6892
6893         if (!mdt->mdt_skip_lfsck && !mdt->mdt_bottom->dd_rdonly) {
6894                 struct lfsck_start_param lsp;
6895
6896                 lsp.lsp_start = NULL;
6897                 lsp.lsp_index_valid = 0;
6898                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
6899                                                            OBD_IOC_START_LFSCK,
6900                                                            0, &lsp);
6901                 if (rc != 0 && rc != -EALREADY)
6902                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
6903                               mdt_obd_name(mdt), rc);
6904         }
6905
6906         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
6907         RETURN(rc);
6908 }
6909
6910 static int mdt_obd_postrecov(struct obd_device *obd)
6911 {
6912         struct lu_env env;
6913         int rc;
6914
6915         rc = lu_env_init(&env, LCT_MD_THREAD);
6916         if (rc)
6917                 RETURN(rc);
6918         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
6919         lu_env_fini(&env);
6920         return rc;
6921 }
6922
6923 static struct obd_ops mdt_obd_device_ops = {
6924         .o_owner          = THIS_MODULE,
6925         .o_set_info_async = mdt_obd_set_info_async,
6926         .o_connect        = mdt_obd_connect,
6927         .o_reconnect      = mdt_obd_reconnect,
6928         .o_disconnect     = mdt_obd_disconnect,
6929         .o_init_export    = mdt_init_export,
6930         .o_destroy_export = mdt_destroy_export,
6931         .o_iocontrol      = mdt_iocontrol,
6932         .o_postrecov      = mdt_obd_postrecov,
6933         /* Data-on-MDT IO methods */
6934         .o_preprw         = mdt_obd_preprw,
6935         .o_commitrw       = mdt_obd_commitrw,
6936 };
6937
6938 static struct lu_device* mdt_device_fini(const struct lu_env *env,
6939                                          struct lu_device *d)
6940 {
6941         struct mdt_device *m = mdt_dev(d);
6942         ENTRY;
6943
6944         mdt_fini(env, m);
6945         RETURN(NULL);
6946 }
6947
6948 static struct lu_device *mdt_device_free(const struct lu_env *env,
6949                                          struct lu_device *d)
6950 {
6951         struct mdt_device *m = mdt_dev(d);
6952         ENTRY;
6953
6954         lu_device_fini(&m->mdt_lu_dev);
6955         OBD_FREE_PTR(m);
6956
6957         RETURN(NULL);
6958 }
6959
6960 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
6961                                           struct lu_device_type *t,
6962                                           struct lustre_cfg *cfg)
6963 {
6964         struct lu_device  *l;
6965         struct mdt_device *m;
6966
6967         OBD_ALLOC_PTR(m);
6968         if (m != NULL) {
6969                 int rc;
6970
6971                 l = &m->mdt_lu_dev;
6972                 rc = mdt_init0(env, m, t, cfg);
6973                 if (rc != 0) {
6974                         mdt_device_free(env, l);
6975                         l = ERR_PTR(rc);
6976                         return l;
6977                 }
6978         } else
6979                 l = ERR_PTR(-ENOMEM);
6980         return l;
6981 }
6982
6983 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
6984 LU_KEY_INIT(mdt, struct mdt_thread_info);
6985
6986 static void mdt_key_fini(const struct lu_context *ctx,
6987                          struct lu_context_key *key, void* data)
6988 {
6989         struct mdt_thread_info *info = data;
6990
6991         if (info->mti_big_lmm) {
6992                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
6993                 info->mti_big_lmm = NULL;
6994                 info->mti_big_lmmsize = 0;
6995         }
6996
6997         if (info->mti_big_acl) {
6998                 OBD_FREE_LARGE(info->mti_big_acl, info->mti_big_aclsize);
6999                 info->mti_big_acl = NULL;
7000                 info->mti_big_aclsize = 0;
7001         }
7002
7003         OBD_FREE_PTR(info);
7004 }
7005
7006 /* context key: mdt_thread_key */
7007 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
7008
7009 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
7010 {
7011         return lu_ucred(info->mti_env);
7012 }
7013
7014 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
7015 {
7016         return lu_ucred_check(info->mti_env);
7017 }
7018
7019 /**
7020  * Enable/disable COS (Commit On Sharing).
7021  *
7022  * Set/Clear the COS flag in mdt options.
7023  *
7024  * \param mdt mdt device
7025  * \param val 0 disables COS, other values enable COS
7026  */
7027 void mdt_enable_cos(struct mdt_device *mdt, bool val)
7028 {
7029         struct lu_env env;
7030         int rc;
7031
7032         mdt->mdt_opts.mo_cos = val;
7033         rc = lu_env_init(&env, LCT_LOCAL);
7034         if (unlikely(rc != 0)) {
7035                 CWARN("%s: lu_env initialization failed, cannot "
7036                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
7037                 return;
7038         }
7039         mdt_device_sync(&env, mdt);
7040         lu_env_fini(&env);
7041 }
7042
7043 /**
7044  * Check COS (Commit On Sharing) status.
7045  *
7046  * Return COS flag status.
7047  *
7048  * \param mdt mdt device
7049  */
7050 int mdt_cos_is_enabled(struct mdt_device *mdt)
7051 {
7052         return mdt->mdt_opts.mo_cos != 0;
7053 }
7054
7055 static struct lu_device_type_operations mdt_device_type_ops = {
7056         .ldto_device_alloc = mdt_device_alloc,
7057         .ldto_device_free  = mdt_device_free,
7058         .ldto_device_fini  = mdt_device_fini
7059 };
7060
7061 static struct lu_device_type mdt_device_type = {
7062         .ldt_tags     = LU_DEVICE_MD,
7063         .ldt_name     = LUSTRE_MDT_NAME,
7064         .ldt_ops      = &mdt_device_type_ops,
7065         .ldt_ctx_tags = LCT_MD_THREAD
7066 };
7067
7068 static int __init mdt_init(void)
7069 {
7070         int rc;
7071
7072         BUILD_BUG_ON(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") !=
7073                      FID_NOBRACE_LEN + 1);
7074         BUILD_BUG_ON(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") !=
7075                      FID_LEN + 1);
7076         rc = lu_kmem_init(mdt_caches);
7077         if (rc)
7078                 return rc;
7079
7080         rc = mds_mod_init();
7081         if (rc)
7082                 GOTO(lu_fini, rc);
7083
7084         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
7085                                  LUSTRE_MDT_NAME, &mdt_device_type);
7086         if (rc)
7087                 GOTO(mds_fini, rc);
7088 lu_fini:
7089         if (rc)
7090                 lu_kmem_fini(mdt_caches);
7091 mds_fini:
7092         if (rc)
7093                 mds_mod_exit();
7094         return rc;
7095 }
7096
7097 static void __exit mdt_exit(void)
7098 {
7099         class_unregister_type(LUSTRE_MDT_NAME);
7100         mds_mod_exit();
7101         lu_kmem_fini(mdt_caches);
7102 }
7103
7104 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
7105 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
7106 MODULE_VERSION(LUSTRE_VERSION_STRING);
7107 MODULE_LICENSE("GPL");
7108
7109 module_init(mdt_init);
7110 module_exit(mdt_exit);