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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_handler.c
  37  *
  38  * Lustre Metadata Target (mdt) request handler
  39  *
  40  * Author: Peter Braam <braam@clusterfs.com>
  41  * Author: Andreas Dilger <adilger@clusterfs.com>
  42  * Author: Phil Schwan <phil@clusterfs.com>
  43  * Author: Mike Shaver <shaver@clusterfs.com>
  44  * Author: Nikita Danilov <nikita@clusterfs.com>
  45  * Author: Huang Hua <huanghua@clusterfs.com>
  46  * Author: Yury Umanets <umka@clusterfs.com>
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_MDS
  50
  51 #include <linux/module.h>
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  */
  55 #include <obd_support.h>
  56 /* struct ptlrpc_request */
  57 #include <lustre_net.h>
  58 /* struct obd_export */
  59 #include <lustre_export.h>
  60 /* struct obd_device */
  61 #include <obd.h>
  62 /* lu2dt_dev() */
  63 #include <dt_object.h>
  64 #include <lustre_mds.h>
  65 #include <lustre_log.h>
  66 #include "mdt_internal.h"
  67 #include <lustre_acl.h>
  68 #include <lustre_param.h>
  69 #include <lustre_quota.h>
  70 #include <lustre_lfsck.h>
  71
  72 mdl_mode_t mdt_mdl_lock_modes[] = {
  73         [LCK_MINMODE] = MDL_MINMODE,
  74         [LCK_EX]      = MDL_EX,
  75         [LCK_PW]      = MDL_PW,
  76         [LCK_PR]      = MDL_PR,
  77         [LCK_CW]      = MDL_CW,
  78         [LCK_CR]      = MDL_CR,
  79         [LCK_NL]      = MDL_NL,
  80         [LCK_GROUP]   = MDL_GROUP
  81 };
  82
  83 ldlm_mode_t mdt_dlm_lock_modes[] = {
  84         [MDL_MINMODE] = LCK_MINMODE,
  85         [MDL_EX]      = LCK_EX,
  86         [MDL_PW]      = LCK_PW,
  87         [MDL_PR]      = LCK_PR,
  88         [MDL_CW]      = LCK_CW,
  89         [MDL_CR]      = LCK_CR,
  90         [MDL_NL]      = LCK_NL,
  91         [MDL_GROUP]   = LCK_GROUP
  92 };
  93
  94 static struct mdt_device *mdt_dev(struct lu_device *d);
  95 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  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 int mdt_get_disposition(struct ldlm_reply *rep, int flag)
 130 {
 131         if (!rep)
 132                 return 0;
 133         return (rep->lock_policy_res1 & flag);
 134 }
 135
 136 void mdt_clear_disposition(struct mdt_thread_info *info,
 137                            struct ldlm_reply *rep, int flag)
 138 {
 139         if (info) {
 140                 info->mti_opdata &= ~flag;
 141                 tgt_opdata_clear(info->mti_env, flag);
 142         }
 143         if (rep)
 144                 rep->lock_policy_res1 &= ~flag;
 145 }
 146
 147 void mdt_set_disposition(struct mdt_thread_info *info,
 148                          struct ldlm_reply *rep, int flag)
 149 {
 150         if (info) {
 151                 info->mti_opdata |= flag;
 152                 tgt_opdata_set(info->mti_env, flag);
 153         }
 154         if (rep)
 155                 rep->lock_policy_res1 |= flag;
 156 }
 157
 158 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t 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, ldlm_mode_t lock_mode,
 167                        const struct lu_name *lname)
 168 {
 169         lh->mlh_reg_mode = lock_mode;
 170         lh->mlh_rreg_mode = lock_mode;
 171         lh->mlh_type = MDT_PDO_LOCK;
 172
 173         if (lu_name_is_valid(lname)) {
 174                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
 175                                                   lname->ln_namelen);
 176                 /* XXX Workaround for LU-2856
 177                  *
 178                  * Zero is a valid return value of full_name_hash, but
 179                  * several users of mlh_pdo_hash assume a non-zero
 180                  * hash value. We therefore map zero onto an
 181                  * arbitrary, but consistent value (1) to avoid
 182                  * problems further down the road. */
 183                 if (unlikely(lh->mlh_pdo_hash == 0))
 184                         lh->mlh_pdo_hash = 1;
 185         } else {
 186                 lh->mlh_pdo_hash = 0;
 187         }
 188 }
 189
 190 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 191                               struct mdt_lock_handle *lh)
 192 {
 193         mdl_mode_t mode;
 194         ENTRY;
 195
 196         /*
 197          * Any dir access needs couple of locks:
 198          *
 199          * 1) on part of dir we gonna take lookup/modify;
 200          *
 201          * 2) on whole dir to protect it from concurrent splitting and/or to
 202          * flush client's cache for readdir().
 203          *
 204          * so, for a given mode and object this routine decides what lock mode
 205          * to use for lock #2:
 206          *
 207          * 1) if caller's gonna lookup in dir then we need to protect dir from
 208          * being splitted only - LCK_CR
 209          *
 210          * 2) if caller's gonna modify dir then we need to protect dir from
 211          * being splitted and to flush cache - LCK_CW
 212          *
 213          * 3) if caller's gonna modify dir and that dir seems ready for
 214          * splitting then we need to protect it from any type of access
 215          * (lookup/modify/split) - LCK_EX --bzzz
 216          */
 217
 218         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 219         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 220
 221         /*
 222          * Ask underlaying level its opinion about preferable PDO lock mode
 223          * having access type passed as regular lock mode:
 224          *
 225          * - MDL_MINMODE means that lower layer does not want to specify lock
 226          * mode;
 227          *
 228          * - MDL_NL means that no PDO lock should be taken. This is used in some
 229          * cases. Say, for non-splittable directories no need to use PDO locks
 230          * at all.
 231          */
 232         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 233                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 234
 235         if (mode != MDL_MINMODE) {
 236                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 237         } else {
 238                 /*
 239                  * Lower layer does not want to specify locking mode. We do it
 240                  * our selves. No special protection is needed, just flush
 241                  * client's cache on modification and allow concurrent
 242                  * mondification.
 243                  */
 244                 switch (lh->mlh_reg_mode) {
 245                 case LCK_EX:
 246                         lh->mlh_pdo_mode = LCK_EX;
 247                         break;
 248                 case LCK_PR:
 249                         lh->mlh_pdo_mode = LCK_CR;
 250                         break;
 251                 case LCK_PW:
 252                         lh->mlh_pdo_mode = LCK_CW;
 253                         break;
 254                 default:
 255                         CERROR("Not expected lock type (0x%x)\n",
 256                                (int)lh->mlh_reg_mode);
 257                         LBUG();
 258                 }
 259         }
 260
 261         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 262         EXIT;
 263 }
 264
 265 int mdt_getstatus(struct tgt_session_info *tsi)
 266 {
 267         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 268         struct mdt_device       *mdt = info->mti_mdt;
 269         struct mdt_body         *repbody;
 270         int                      rc;
 271
 272         ENTRY;
 273
 274         rc = mdt_check_ucred(info);
 275         if (rc)
 276                 GOTO(out, rc = err_serious(rc));
 277
 278         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
 279                 GOTO(out, rc = err_serious(-ENOMEM));
 280
 281         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 282         repbody->fid1 = mdt->mdt_md_root_fid;
 283         repbody->valid |= OBD_MD_FLID;
 284
 285         if (tsi->tsi_tgt->lut_mds_capa &&
 286             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
 287                 struct mdt_object       *root;
 288                 struct lustre_capa      *capa;
 289
 290                 root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
 291                 if (IS_ERR(root))
 292                         GOTO(out, rc = PTR_ERR(root));
 293
 294                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 295                 LASSERT(capa);
 296                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 297                 rc = mo_capa_get(info->mti_env, mdt_object_child(root), capa,
 298                                  0);
 299                 mdt_object_put(info->mti_env, root);
 300                 if (rc == 0)
 301                         repbody->valid |= OBD_MD_FLMDSCAPA;
 302         }
 303         EXIT;
 304 out:
 305         mdt_thread_info_fini(info);
 306         return rc;
 307 }
 308
 309 int mdt_statfs(struct tgt_session_info *tsi)
 310 {
 311         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 312         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 313         struct md_device                *next = info->mti_mdt->mdt_child;
 314         struct ptlrpc_service_part      *svcpt;
 315         struct obd_statfs               *osfs;
 316         int                             rc;
 317
 318         ENTRY;
 319
 320         svcpt = req->rq_rqbd->rqbd_svcpt;
 321
 322         /* This will trigger a watchdog timeout */
 323         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 324                          (MDT_SERVICE_WATCHDOG_FACTOR *
 325                           at_get(&svcpt->scp_at_estimate)) + 1);
 326
 327         rc = mdt_check_ucred(info);
 328         if (rc)
 329                 GOTO(out, rc = err_serious(rc));
 330
 331         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 332                 GOTO(out, rc = err_serious(-ENOMEM));
 333
 334         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 335         if (!osfs)
 336                 GOTO(out, rc = -EPROTO);
 337
 338         /** statfs information are cached in the mdt_device */
 339         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 340                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 341                 /** statfs data is too old, get up-to-date one */
 342                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 343                 if (rc)
 344                         GOTO(out, rc);
 345                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 346                 info->mti_mdt->mdt_osfs = *osfs;
 347                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 348                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 349         } else {
 350                 /** use cached statfs data */
 351                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 352                 *osfs = info->mti_mdt->mdt_osfs;
 353                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 354         }
 355
 356         if (rc == 0)
 357                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 358 out:
 359         mdt_thread_info_fini(info);
 360         RETURN(rc);
 361 }
 362
 363 /**
 364  * Pack SOM attributes into the reply.
 365  * Call under a DLM UPDATE lock.
 366  */
 367 static void mdt_pack_size2body(struct mdt_thread_info *info,
 368                                struct mdt_object *mo)
 369 {
 370         struct mdt_body *b;
 371         struct md_attr *ma = &info->mti_attr;
 372
 373         LASSERT(ma->ma_attr.la_valid & LA_MODE);
 374         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 375
 376         /* Check if Size-on-MDS is supported, if this is a regular file,
 377          * if SOM is enabled on the object and if SOM cache exists and valid.
 378          * Otherwise do not pack Size-on-MDS attributes to the reply. */
 379         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 380             !S_ISREG(ma->ma_attr.la_mode) ||
 381             !mdt_object_is_som_enabled(mo) ||
 382             !(ma->ma_valid & MA_SOM))
 383                 return;
 384
 385         b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 386         b->size = ma->ma_som->msd_size;
 387         b->blocks = ma->ma_som->msd_blocks;
 388 }
 389
 390 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 391                         const struct lu_attr *attr, const struct lu_fid *fid)
 392 {
 393         struct md_attr *ma = &info->mti_attr;
 394
 395         LASSERT(ma->ma_valid & MA_INODE);
 396
 397         b->atime      = attr->la_atime;
 398         b->mtime      = attr->la_mtime;
 399         b->ctime      = attr->la_ctime;
 400         b->mode       = attr->la_mode;
 401         b->size       = attr->la_size;
 402         b->blocks     = attr->la_blocks;
 403         b->uid        = attr->la_uid;
 404         b->gid        = attr->la_gid;
 405         b->flags      = attr->la_flags;
 406         b->nlink      = attr->la_nlink;
 407         b->rdev       = attr->la_rdev;
 408
 409         /*XXX should pack the reply body according to lu_valid*/
 410         b->valid |= OBD_MD_FLCTIME | OBD_MD_FLUID   |
 411                     OBD_MD_FLGID   | OBD_MD_FLTYPE  |
 412                     OBD_MD_FLMODE  | OBD_MD_FLNLINK | OBD_MD_FLFLAGS |
 413                     OBD_MD_FLATIME | OBD_MD_FLMTIME ;
 414
 415         if (!S_ISREG(attr->la_mode)) {
 416                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 417         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 418                 /* means no objects are allocated on osts. */
 419                 LASSERT(!(ma->ma_valid & MA_LOV));
 420                 /* just ignore blocks occupied by extend attributes on MDS */
 421                 b->blocks = 0;
 422                 /* if no object is allocated on osts, the size on mds is valid. b=22272 */
 423                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 424         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 425                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 426                 /* A released file stores its size on MDS. */
 427                 /* But return 1 block for released file, unless tools like tar
 428                  * will consider it fully sparse. (LU-3864)
 429                  */
 430                 if (unlikely(b->size == 0))
 431                         b->blocks = 0;
 432                 else
 433                         b->blocks = 1;
 434                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 435         }
 436
 437         if (fid) {
 438                 b->fid1 = *fid;
 439                 b->valid |= OBD_MD_FLID;
 440                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, size="LPU64"\n",
 441                                 PFID(fid), b->nlink, b->mode, b->size);
 442         }
 443
 444         if (info)
 445                 mdt_body_reverse_idmap(info, b);
 446
 447         if (fid != NULL && (b->valid & OBD_MD_FLSIZE))
 448                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 449                        PFID(fid), (unsigned long long)b->size);
 450 }
 451
 452 static inline int mdt_body_has_lov(const struct lu_attr *la,
 453                                    const struct mdt_body *body)
 454 {
 455         return ((S_ISREG(la->la_mode) && (body->valid & OBD_MD_FLEASIZE)) ||
 456                 (S_ISDIR(la->la_mode) && (body->valid & OBD_MD_FLDIREA )) );
 457 }
 458
 459 void mdt_client_compatibility(struct mdt_thread_info *info)
 460 {
 461         struct mdt_body       *body;
 462         struct ptlrpc_request *req = mdt_info_req(info);
 463         struct obd_export     *exp = req->rq_export;
 464         struct md_attr        *ma = &info->mti_attr;
 465         struct lu_attr        *la = &ma->ma_attr;
 466         ENTRY;
 467
 468         if (exp_connect_layout(exp))
 469                 /* the client can deal with 16-bit lmm_stripe_count */
 470                 RETURN_EXIT;
 471
 472         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 473
 474         if (!mdt_body_has_lov(la, body))
 475                 RETURN_EXIT;
 476
 477         /* now we have a reply with a lov for a client not compatible with the
 478          * layout lock so we have to clean the layout generation number */
 479         if (S_ISREG(la->la_mode))
 480                 ma->ma_lmm->lmm_layout_gen = 0;
 481         EXIT;
 482 }
 483
 484 static int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 485                              const char *name)
 486 {
 487         const struct lu_env *env = info->mti_env;
 488         int rc;
 489         ENTRY;
 490
 491         LASSERT(info->mti_big_lmm_used == 0);
 492         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 493         if (rc < 0)
 494                 RETURN(rc);
 495
 496         /* big_lmm may need to be grown */
 497         if (info->mti_big_lmmsize < rc) {
 498                 int size = size_roundup_power2(rc);
 499
 500                 if (info->mti_big_lmmsize > 0) {
 501                         /* free old buffer */
 502                         LASSERT(info->mti_big_lmm);
 503                         OBD_FREE_LARGE(info->mti_big_lmm,
 504                                        info->mti_big_lmmsize);
 505                         info->mti_big_lmm = NULL;
 506                         info->mti_big_lmmsize = 0;
 507                 }
 508
 509                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 510                 if (info->mti_big_lmm == NULL)
 511                         RETURN(-ENOMEM);
 512                 info->mti_big_lmmsize = size;
 513         }
 514         LASSERT(info->mti_big_lmmsize >= rc);
 515
 516         info->mti_buf.lb_buf = info->mti_big_lmm;
 517         info->mti_buf.lb_len = info->mti_big_lmmsize;
 518         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 519
 520         RETURN(rc);
 521 }
 522
 523 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 524                    struct md_attr *ma, const char *name)
 525 {
 526         struct md_object *next = mdt_object_child(o);
 527         struct lu_buf    *buf = &info->mti_buf;
 528         int rc;
 529
 530         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 531                 buf->lb_buf = ma->ma_lmm;
 532                 buf->lb_len = ma->ma_lmm_size;
 533                 LASSERT(!(ma->ma_valid & MA_LOV));
 534         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 535                 buf->lb_buf = ma->ma_lmv;
 536                 buf->lb_len = ma->ma_lmv_size;
 537                 LASSERT(!(ma->ma_valid & MA_LMV));
 538         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 539                 buf->lb_buf = ma->ma_lmv;
 540                 buf->lb_len = ma->ma_lmv_size;
 541                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 542         } else {
 543                 return -EINVAL;
 544         }
 545
 546         rc = mo_xattr_get(info->mti_env, next, buf, name);
 547         if (rc > 0) {
 548                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 549                         ma->ma_lmm_size = rc;
 550                         ma->ma_valid |= MA_LOV;
 551                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 552                         ma->ma_lmv_size = rc;
 553                         ma->ma_valid |= MA_LMV;
 554                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 555                         ma->ma_lmv_size = rc;
 556                         ma->ma_valid |= MA_LMV_DEF;
 557                 }
 558
 559                 rc = 0;
 560         } else if (rc == -ENODATA) {
 561                 /* no LOV EA */
 562                 rc = 0;
 563         } else if (rc == -ERANGE) {
 564                 /* Default LMV has fixed size, so it must be able to fit
 565                  * in the original buffer */
 566                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 567                         return rc;
 568                 rc = mdt_big_xattr_get(info, o, name);
 569                 if (rc > 0) {
 570                         info->mti_big_lmm_used = 1;
 571                         if (!strcmp(name, XATTR_NAME_LOV)) {
 572                                 ma->ma_valid |= MA_LOV;
 573                                 ma->ma_lmm = info->mti_big_lmm;
 574                                 ma->ma_lmm_size = rc;
 575                         } else if (!strcmp(name, XATTR_NAME_LMV)) {
 576                                 ma->ma_valid |= MA_LMV;
 577                                 ma->ma_lmv = info->mti_big_lmm;
 578                                 ma->ma_lmv_size = rc;
 579                         } else {
 580                                 return -EINVAL;
 581                         }
 582
 583                         /* update mdt_max_mdsize so all clients
 584                          * will be aware about that */
 585                         if (info->mti_mdt->mdt_max_mdsize < rc)
 586                                 info->mti_mdt->mdt_max_mdsize = rc;
 587                         rc = 0;
 588                 }
 589         }
 590
 591         return rc;
 592 }
 593
 594 int mdt_attr_get_pfid(struct mdt_thread_info *info,
 595                       struct mdt_object *o, struct lu_fid *pfid)
 596 {
 597         struct lu_buf           *buf = &info->mti_buf;
 598         struct link_ea_header   *leh;
 599         struct link_ea_entry    *lee;
 600         int                      rc;
 601         ENTRY;
 602
 603         buf->lb_buf = info->mti_big_lmm;
 604         buf->lb_len = info->mti_big_lmmsize;
 605         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 606                           buf, XATTR_NAME_LINK);
 607         /* ignore errors, MA_PFID won't be set and it is
 608          * up to the caller to treat this as an error */
 609         if (rc == -ERANGE || buf->lb_len == 0) {
 610                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 611                 buf->lb_buf = info->mti_big_lmm;
 612                 buf->lb_len = info->mti_big_lmmsize;
 613         }
 614
 615         if (rc < 0)
 616                 RETURN(rc);
 617         if (rc < sizeof(*leh)) {
 618                 CERROR("short LinkEA on "DFID": rc = %d\n",
 619                        PFID(mdt_object_fid(o)), rc);
 620                 RETURN(-ENODATA);
 621         }
 622
 623         leh = (struct link_ea_header *) buf->lb_buf;
 624         lee = (struct link_ea_entry *)(leh + 1);
 625         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 626                 leh->leh_magic = LINK_EA_MAGIC;
 627                 leh->leh_reccount = __swab32(leh->leh_reccount);
 628                 leh->leh_len = __swab64(leh->leh_len);
 629         }
 630         if (leh->leh_magic != LINK_EA_MAGIC)
 631                 RETURN(-EINVAL);
 632         if (leh->leh_reccount == 0)
 633                 RETURN(-ENODATA);
 634
 635         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 636         fid_be_to_cpu(pfid, pfid);
 637
 638         RETURN(0);
 639 }
 640
 641 int mdt_attr_get_complex(struct mdt_thread_info *info,
 642                          struct mdt_object *o, struct md_attr *ma)
 643 {
 644         const struct lu_env *env = info->mti_env;
 645         struct md_object    *next = mdt_object_child(o);
 646         struct lu_buf       *buf = &info->mti_buf;
 647         u32                  mode = lu_object_attr(&next->mo_lu);
 648         int                  need = ma->ma_need;
 649         int                  rc = 0, rc2;
 650         ENTRY;
 651
 652         ma->ma_valid = 0;
 653
 654         if (need & MA_INODE) {
 655                 ma->ma_need = MA_INODE;
 656                 rc = mo_attr_get(env, next, ma);
 657                 if (rc)
 658                         GOTO(out, rc);
 659                 ma->ma_valid |= MA_INODE;
 660         }
 661
 662         if (need & MA_PFID) {
 663                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 664                 if (rc == 0)
 665                         ma->ma_valid |= MA_PFID;
 666                 /* ignore this error, parent fid is not mandatory */
 667                 rc = 0;
 668         }
 669
 670         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 671                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 672                 if (rc)
 673                         GOTO(out, rc);
 674         }
 675
 676         if (need & MA_LMV && S_ISDIR(mode)) {
 677                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 678                 if (rc != 0)
 679                         GOTO(out, rc);
 680         }
 681
 682         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 683                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 684                 if (rc != 0)
 685                         GOTO(out, rc);
 686         }
 687
 688         if (need & MA_SOM && S_ISREG(mode)) {
 689                 buf->lb_buf = info->mti_xattr_buf;
 690                 buf->lb_len = sizeof(info->mti_xattr_buf);
 691                 CLASSERT(sizeof(struct som_attrs) <=
 692                          sizeof(info->mti_xattr_buf));
 693                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_SOM);
 694                 rc2 = lustre_buf2som(info->mti_xattr_buf, rc2, ma->ma_som);
 695                 if (rc2 == 0)
 696                         ma->ma_valid |= MA_SOM;
 697                 else if (rc2 < 0 && rc2 != -ENODATA)
 698                         GOTO(out, rc = rc2);
 699         }
 700
 701         if (need & MA_HSM && S_ISREG(mode)) {
 702                 buf->lb_buf = info->mti_xattr_buf;
 703                 buf->lb_len = sizeof(info->mti_xattr_buf);
 704                 CLASSERT(sizeof(struct hsm_attrs) <=
 705                          sizeof(info->mti_xattr_buf));
 706                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 707                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 708                 if (rc2 == 0)
 709                         ma->ma_valid |= MA_HSM;
 710                 else if (rc2 < 0 && rc2 != -ENODATA)
 711                         GOTO(out, rc = rc2);
 712         }
 713
 714 #ifdef CONFIG_FS_POSIX_ACL
 715         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 716                 buf->lb_buf = ma->ma_acl;
 717                 buf->lb_len = ma->ma_acl_size;
 718                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 719                 if (rc2 > 0) {
 720                         ma->ma_acl_size = rc2;
 721                         ma->ma_valid |= MA_ACL_DEF;
 722                 } else if (rc2 == -ENODATA) {
 723                         /* no ACLs */
 724                         ma->ma_acl_size = 0;
 725                 } else
 726                         GOTO(out, rc = rc2);
 727         }
 728 #endif
 729 out:
 730         ma->ma_need = need;
 731         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 732                rc, ma->ma_valid, ma->ma_lmm);
 733         RETURN(rc);
 734 }
 735
 736 static int mdt_getattr_internal(struct mdt_thread_info *info,
 737                                 struct mdt_object *o, int ma_need)
 738 {
 739         struct md_object        *next = mdt_object_child(o);
 740         const struct mdt_body   *reqbody = info->mti_body;
 741         struct ptlrpc_request   *req = mdt_info_req(info);
 742         struct md_attr          *ma = &info->mti_attr;
 743         struct lu_attr          *la = &ma->ma_attr;
 744         struct req_capsule      *pill = info->mti_pill;
 745         const struct lu_env     *env = info->mti_env;
 746         struct mdt_body         *repbody;
 747         struct lu_buf           *buffer = &info->mti_buf;
 748         int                     rc;
 749         int                     is_root;
 750         ENTRY;
 751
 752         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 753                 RETURN(err_serious(-ENOMEM));
 754
 755         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 756
 757         ma->ma_valid = 0;
 758
 759         if (mdt_object_remote(o)) {
 760                 /* This object is located on remote node.*/
 761                 /* Return -EIO for old client */
 762                 if (!mdt_is_dne_client(req->rq_export))
 763                         GOTO(out, rc = -EIO);
 764
 765                 repbody->fid1 = *mdt_object_fid(o);
 766                 repbody->valid = OBD_MD_FLID | OBD_MD_MDS;
 767                 GOTO(out, rc = 0);
 768         }
 769
 770         buffer->lb_len = reqbody->eadatasize;
 771         if (buffer->lb_len > 0) {
 772                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 773                 if (buffer->lb_buf == NULL)
 774                         GOTO(out, rc = -EPROTO);
 775         } else {
 776                 buffer->lb_buf = NULL;
 777                 ma_need &= ~(MA_LOV | MA_LMV);
 778                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 779                        mdt_obd_name(info->mti_mdt),
 780                        req->rq_export->exp_client_uuid.uuid);
 781         }
 782
 783         /* If it is dir object and client require MEA, then we got MEA */
 784         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 785             (reqbody->valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 786                 /* Assumption: MDT_MD size is enough for lmv size. */
 787                 ma->ma_lmv = buffer->lb_buf;
 788                 ma->ma_lmv_size = buffer->lb_len;
 789                 ma->ma_need = MA_INODE;
 790                 if (ma->ma_lmv_size > 0) {
 791                         if (reqbody->valid & OBD_MD_MEA)
 792                                 ma->ma_need |= MA_LMV;
 793                         else if (reqbody->valid & OBD_MD_DEFAULT_MEA)
 794                                 ma->ma_need |= MA_LMV_DEF;
 795                 }
 796         } else {
 797                 ma->ma_lmm = buffer->lb_buf;
 798                 ma->ma_lmm_size = buffer->lb_len;
 799                 ma->ma_need = MA_INODE | MA_HSM;
 800                 if (ma->ma_lmm_size > 0)
 801                         ma->ma_need |= MA_LOV;
 802         }
 803
 804         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 805             reqbody->valid & OBD_MD_FLDIREA  &&
 806             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 807                 /* get default stripe info for this dir. */
 808                 ma->ma_need |= MA_LOV_DEF;
 809         }
 810         ma->ma_need |= ma_need;
 811         if (ma->ma_need & MA_SOM)
 812                 ma->ma_som = &info->mti_u.som.data;
 813
 814         rc = mdt_attr_get_complex(info, o, ma);
 815         if (unlikely(rc)) {
 816                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 817                        mdt_obd_name(info->mti_mdt),
 818                        PFID(mdt_object_fid(o)), rc);
 819                 RETURN(rc);
 820         }
 821
 822         /* if file is released, check if a restore is running */
 823         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
 824             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
 825                 repbody->t_state = MS_RESTORE;
 826                 repbody->valid |= OBD_MD_TSTATE;
 827         }
 828
 829         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 830
 831         /* the Lustre protocol supposes to return default striping
 832          * on the user-visible root if explicitly requested */
 833         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 834             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 835                 struct lu_fid      rootfid;
 836                 struct mdt_object *root;
 837                 struct mdt_device *mdt = info->mti_mdt;
 838
 839                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 840                 if (rc)
 841                         RETURN(rc);
 842                 root = mdt_object_find(env, mdt, &rootfid);
 843                 if (IS_ERR(root))
 844                         RETURN(PTR_ERR(root));
 845                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
 846                 mdt_object_put(info->mti_env, root);
 847                 if (unlikely(rc)) {
 848                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 849                                mdt_obd_name(info->mti_mdt),
 850                                PFID(mdt_object_fid(o)), rc);
 851                         RETURN(rc);
 852                 }
 853         }
 854
 855         if (likely(ma->ma_valid & MA_INODE))
 856                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 857         else
 858                 RETURN(-EFAULT);
 859
 860         if (mdt_body_has_lov(la, reqbody)) {
 861                 if (ma->ma_valid & MA_LOV) {
 862                         LASSERT(ma->ma_lmm_size);
 863                         mdt_dump_lmm(D_INFO, ma->ma_lmm);
 864                         repbody->eadatasize = ma->ma_lmm_size;
 865                         if (S_ISDIR(la->la_mode))
 866                                 repbody->valid |= OBD_MD_FLDIREA;
 867                         else
 868                                 repbody->valid |= OBD_MD_FLEASIZE;
 869                 }
 870                 if (ma->ma_valid & MA_LMV) {
 871                         LASSERT(S_ISDIR(la->la_mode));
 872                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
 873                         repbody->eadatasize = ma->ma_lmv_size;
 874                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 875                 }
 876                 if (ma->ma_valid & MA_LMV_DEF) {
 877                         LASSERT(S_ISDIR(la->la_mode));
 878                         repbody->eadatasize = ma->ma_lmv_size;
 879                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_DEFAULT_MEA);
 880                 }
 881         } else if (S_ISLNK(la->la_mode) &&
 882                    reqbody->valid & OBD_MD_LINKNAME) {
 883                 buffer->lb_buf = ma->ma_lmm;
 884                 /* eadatasize from client includes NULL-terminator, so
 885                  * there is no need to read it */
 886                 buffer->lb_len = reqbody->eadatasize - 1;
 887                 rc = mo_readlink(env, next, buffer);
 888                 if (unlikely(rc <= 0)) {
 889                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 890                                mdt_obd_name(info->mti_mdt),
 891                                PFID(mdt_object_fid(o)), rc);
 892                         rc = -EFAULT;
 893                 } else {
 894                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 895
 896                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 897                                 rc -= 2;
 898                         repbody->valid |= OBD_MD_LINKNAME;
 899                         /* we need to report back size with NULL-terminator
 900                          * because client expects that */
 901                         repbody->eadatasize = rc + 1;
 902                         if (repbody->eadatasize != reqbody->eadatasize)
 903                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 904                                        "on "DFID ", expected %d\n",
 905                                        mdt_obd_name(info->mti_mdt),
 906                                        rc, PFID(mdt_object_fid(o)),
 907                                        reqbody->eadatasize - 1);
 908                         /* NULL terminate */
 909                         ((char *)ma->ma_lmm)[rc] = 0;
 910
 911                         /* If the total CDEBUG() size is larger than a page, it
 912                          * will print a warning to the console, avoid this by
 913                          * printing just the last part of the symlink. */
 914                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
 915                                print_limit < rc ? "..." : "", print_limit,
 916                                (char *)ma->ma_lmm + rc - print_limit, rc);
 917                         rc = 0;
 918                 }
 919         }
 920
 921         if (reqbody->valid & OBD_MD_FLMODEASIZE) {
 922                 repbody->max_cookiesize = 0;
 923                 repbody->max_mdsize = info->mti_mdt->mdt_max_mdsize;
 924                 repbody->valid |= OBD_MD_FLMODEASIZE;
 925                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
 926                        "MAX_COOKIE to : %d:%d\n", repbody->max_mdsize,
 927                        repbody->max_cookiesize);
 928         }
 929
 930         if (exp_connect_rmtclient(info->mti_exp) &&
 931             reqbody->valid & OBD_MD_FLRMTPERM) {
 932                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
 933
 934                 /* mdt_getattr_lock only */
 935                 rc = mdt_pack_remote_perm(info, o, buf);
 936                 if (rc) {
 937                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 938                         repbody->aclsize = 0;
 939                         RETURN(rc);
 940                 } else {
 941                         repbody->valid |= OBD_MD_FLRMTPERM;
 942                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 943                 }
 944         }
 945 #ifdef CONFIG_FS_POSIX_ACL
 946         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
 947                  (reqbody->valid & OBD_MD_FLACL)) {
 948                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 949                 buffer->lb_len = req_capsule_get_size(pill,
 950                                                       &RMF_ACL, RCL_SERVER);
 951                 if (buffer->lb_len > 0) {
 952                         rc = mo_xattr_get(env, next, buffer,
 953                                           XATTR_NAME_ACL_ACCESS);
 954                         if (rc < 0) {
 955                                 if (rc == -ENODATA) {
 956                                         repbody->aclsize = 0;
 957                                         repbody->valid |= OBD_MD_FLACL;
 958                                         rc = 0;
 959                                 } else if (rc == -EOPNOTSUPP) {
 960                                         rc = 0;
 961                                 } else {
 962                                         CERROR("%s: unable to read "DFID
 963                                                " ACL: rc = %d\n",
 964                                                mdt_obd_name(info->mti_mdt),
 965                                                PFID(mdt_object_fid(o)), rc);
 966                                 }
 967                         } else {
 968                                 repbody->aclsize = rc;
 969                                 repbody->valid |= OBD_MD_FLACL;
 970                                 rc = 0;
 971                         }
 972                 }
 973         }
 974 #endif
 975
 976         if (reqbody->valid & OBD_MD_FLMDSCAPA &&
 977             info->mti_mdt->mdt_lut.lut_mds_capa &&
 978             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
 979                 struct lustre_capa *capa;
 980
 981                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
 982                 LASSERT(capa);
 983                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 984                 rc = mo_capa_get(env, next, capa, 0);
 985                 if (rc)
 986                         RETURN(rc);
 987                 repbody->valid |= OBD_MD_FLMDSCAPA;
 988         }
 989
 990 out:
 991         if (rc == 0)
 992                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
 993
 994         RETURN(rc);
 995 }
 996
 997 static int mdt_renew_capa(struct mdt_thread_info *info)
 998 {
 999         struct mdt_object  *obj = info->mti_object;
1000         struct mdt_body    *body;
1001         struct lustre_capa *capa, *c;
1002         int rc;
1003         ENTRY;
1004
1005         /* if object doesn't exist, or server has disabled capability,
1006          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
1007          * flag not set.
1008          */
1009         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
1010             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
1011                 RETURN(0);
1012
1013         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1014         LASSERT(body != NULL);
1015
1016         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
1017         LASSERT(c);
1018
1019         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
1020         LASSERT(capa);
1021
1022         *capa = *c;
1023         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
1024         if (rc == 0)
1025                 body->valid |= OBD_MD_FLOSSCAPA;
1026         RETURN(rc);
1027 }
1028
1029 int mdt_getattr(struct tgt_session_info *tsi)
1030 {
1031         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1032         struct mdt_object       *obj = info->mti_object;
1033         struct req_capsule      *pill = info->mti_pill;
1034         struct mdt_body         *reqbody;
1035         struct mdt_body         *repbody;
1036         mode_t                   mode;
1037         int rc, rc2;
1038         ENTRY;
1039
1040         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1041         LASSERT(reqbody);
1042
1043         if (reqbody->valid & OBD_MD_FLOSSCAPA) {
1044                 rc = req_capsule_server_pack(pill);
1045                 if (unlikely(rc))
1046                         RETURN(err_serious(rc));
1047                 rc = mdt_renew_capa(info);
1048                 GOTO(out_shrink, rc);
1049         }
1050
1051         LASSERT(obj != NULL);
1052         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1053
1054         mode = lu_object_attr(&obj->mot_obj);
1055
1056         /* old clients may not report needed easize, use max value then */
1057         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1058                              reqbody->eadatasize == 0 ?
1059                              info->mti_mdt->mdt_max_mdsize :
1060                              reqbody->eadatasize);
1061
1062         rc = req_capsule_server_pack(pill);
1063         if (unlikely(rc != 0))
1064                 GOTO(out, rc = err_serious(rc));
1065
1066         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1067         LASSERT(repbody != NULL);
1068         repbody->eadatasize = 0;
1069         repbody->aclsize = 0;
1070
1071         if (reqbody->valid & OBD_MD_FLRMTPERM)
1072                 rc = mdt_init_ucred(info, reqbody);
1073         else
1074                 rc = mdt_check_ucred(info);
1075         if (unlikely(rc))
1076                 GOTO(out_shrink, rc);
1077
1078         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1079
1080         /*
1081          * Don't check capability at all, because rename might getattr for
1082          * remote obj, and at that time no capability is available.
1083          */
1084         mdt_set_capainfo(info, 1, &reqbody->fid1, BYPASS_CAPA);
1085         rc = mdt_getattr_internal(info, obj, 0);
1086         if (reqbody->valid & OBD_MD_FLRMTPERM)
1087                 mdt_exit_ucred(info);
1088         EXIT;
1089 out_shrink:
1090         mdt_client_compatibility(info);
1091         rc2 = mdt_fix_reply(info);
1092         if (rc == 0)
1093                 rc = rc2;
1094 out:
1095         mdt_thread_info_fini(info);
1096         return rc;
1097 }
1098
1099 int mdt_is_subdir(struct tgt_session_info *tsi)
1100 {
1101         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1102         struct mdt_object     *o = info->mti_object;
1103         struct req_capsule    *pill = info->mti_pill;
1104         const struct mdt_body *body = info->mti_body;
1105         struct mdt_body       *repbody;
1106         int                    rc;
1107         ENTRY;
1108
1109         LASSERT(o != NULL);
1110
1111         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1112
1113         /*
1114          * We save last checked parent fid to @repbody->fid1 for remote
1115          * directory case.
1116          */
1117         LASSERT(fid_is_sane(&body->fid2));
1118         LASSERT(mdt_object_exists(o) && !mdt_object_remote(o));
1119         rc = mdo_is_subdir(info->mti_env, mdt_object_child(o),
1120                            &body->fid2, &repbody->fid1);
1121         if (rc == 0 || rc == -EREMOTE)
1122                 repbody->valid |= OBD_MD_FLID;
1123
1124         mdt_thread_info_fini(info);
1125         RETURN(rc);
1126 }
1127
1128 int mdt_swap_layouts(struct tgt_session_info *tsi)
1129 {
1130         struct mdt_thread_info  *info;
1131         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1132         struct obd_export       *exp = req->rq_export;
1133         struct mdt_object       *o1, *o2, *o;
1134         struct mdt_lock_handle  *lh1, *lh2;
1135         struct mdc_swap_layouts *msl;
1136         int                      rc;
1137         ENTRY;
1138
1139         /* client does not support layout lock, so layout swaping
1140          * is disabled.
1141          * FIXME: there is a problem for old clients which don't support
1142          * layout lock yet. If those clients have already opened the file
1143          * they won't be notified at all so that old layout may still be
1144          * used to do IO. This can be fixed after file release is landed by
1145          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1146         if (!exp_connect_layout(exp))
1147                 RETURN(-EOPNOTSUPP);
1148
1149         info = tsi2mdt_info(tsi);
1150         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1151                 mdt_set_capainfo(info, 0, &info->mti_body->fid1,
1152                                  req_capsule_client_get(info->mti_pill,
1153                                                         &RMF_CAPA1));
1154
1155         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1156                 mdt_set_capainfo(info, 1, &info->mti_body->fid2,
1157                                  req_capsule_client_get(info->mti_pill,
1158                                                         &RMF_CAPA2));
1159
1160         o1 = info->mti_object;
1161         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1162                                 &info->mti_body->fid2);
1163         if (IS_ERR(o))
1164                 GOTO(out, rc = PTR_ERR(o));
1165
1166         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1167                 GOTO(put, rc = -ENOENT);
1168
1169         rc = lu_fid_cmp(&info->mti_body->fid1, &info->mti_body->fid2);
1170         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1171                 GOTO(put, rc);
1172
1173         if (rc < 0)
1174                 swap(o1, o2);
1175
1176         /* permission check. Make sure the calling process having permission
1177          * to write both files. */
1178         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1179                                 MAY_WRITE);
1180         if (rc < 0)
1181                 GOTO(put, rc);
1182
1183         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1184                                 MAY_WRITE);
1185         if (rc < 0)
1186                 GOTO(put, rc);
1187
1188         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1189         if (msl == NULL)
1190                 GOTO(put, rc = -EPROTO);
1191
1192         lh1 = &info->mti_lh[MDT_LH_NEW];
1193         mdt_lock_reg_init(lh1, LCK_EX);
1194         lh2 = &info->mti_lh[MDT_LH_OLD];
1195         mdt_lock_reg_init(lh2, LCK_EX);
1196
1197         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1198                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1199         if (rc < 0)
1200                 GOTO(put, rc);
1201
1202         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1203                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1204         if (rc < 0)
1205                 GOTO(unlock1, rc);
1206
1207         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1208                              mdt_object_child(o2), msl->msl_flags);
1209         GOTO(unlock2, rc);
1210 unlock2:
1211         mdt_object_unlock(info, o2, lh2, rc);
1212 unlock1:
1213         mdt_object_unlock(info, o1, lh1, rc);
1214 put:
1215         mdt_object_put(info->mti_env, o);
1216 out:
1217         mdt_thread_info_fini(info);
1218         RETURN(rc);
1219 }
1220
1221 static int mdt_raw_lookup(struct mdt_thread_info *info,
1222                           struct mdt_object *parent,
1223                           const struct lu_name *lname,
1224                           struct ldlm_reply *ldlm_rep)
1225 {
1226         struct md_object *next = mdt_object_child(info->mti_object);
1227         const struct mdt_body *reqbody = info->mti_body;
1228         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1229         struct mdt_body *repbody;
1230         int rc;
1231         ENTRY;
1232
1233         if (reqbody->valid != OBD_MD_FLID)
1234                 RETURN(0);
1235
1236         LASSERT(!info->mti_cross_ref);
1237
1238         /* Only got the fid of this obj by name */
1239         fid_zero(child_fid);
1240         rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1241                         &info->mti_spec);
1242 #if 0
1243         /* XXX is raw_lookup possible as intent operation? */
1244         if (rc != 0) {
1245                 if (rc == -ENOENT)
1246                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1247                 RETURN(rc);
1248         } else
1249                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1250
1251         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1252 #endif
1253         if (rc == 0) {
1254                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1255                 repbody->fid1 = *child_fid;
1256                 repbody->valid = OBD_MD_FLID;
1257         }
1258         RETURN(1);
1259 }
1260
1261 /*
1262  * UPDATE lock should be taken against parent, and be release before exit;
1263  * child_bits lock should be taken against child, and be returned back:
1264  *            (1)normal request should release the child lock;
1265  *            (2)intent request will grant the lock to client.
1266  */
1267 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1268                                  struct mdt_lock_handle *lhc,
1269                                  __u64 child_bits,
1270                                  struct ldlm_reply *ldlm_rep)
1271 {
1272         struct ptlrpc_request  *req       = mdt_info_req(info);
1273         struct mdt_body        *reqbody   = NULL;
1274         struct mdt_object      *parent    = info->mti_object;
1275         struct mdt_object      *child;
1276         struct md_object       *next      = mdt_object_child(parent);
1277         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1278         struct lu_name         *lname     = NULL;
1279         struct mdt_lock_handle *lhp       = NULL;
1280         struct ldlm_lock       *lock;
1281         struct ldlm_res_id     *res_id;
1282         int                     is_resent;
1283         int                     ma_need = 0;
1284         int                     rc;
1285
1286         ENTRY;
1287
1288         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1289         LASSERT(ergo(is_resent,
1290                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1291
1292         LASSERT(parent != NULL);
1293
1294         lname = &info->mti_name;
1295         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1296
1297         if (!info->mti_cross_ref) {
1298                 /*
1299                  * XXX: Check for anonymous name is for getattr by fid
1300                  * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
1301                  * that is the name must contain at least one character and
1302                  * the terminating '\0'.
1303                  */
1304                 if (!lu_name_is_valid(lname)) {
1305                         reqbody = req_capsule_client_get(info->mti_pill,
1306                                                          &RMF_MDT_BODY);
1307                         if (unlikely(reqbody == NULL))
1308                                 RETURN(err_serious(-EFAULT));
1309
1310                         if (unlikely(!fid_is_sane(&reqbody->fid2)))
1311                                 RETURN(err_serious(-EINVAL));
1312
1313                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1314                                "ldlm_rep = %p\n",
1315                                PFID(mdt_object_fid(parent)),
1316                                PFID(&reqbody->fid2), ldlm_rep);
1317                 } else {
1318                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1319                                "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1320                                PNAME(lname), ldlm_rep);
1321                 }
1322         }
1323
1324         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1325
1326         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1327                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1328                                 &parent->mot_obj,
1329                                 "Parent doesn't exist!\n");
1330                 RETURN(-ESTALE);
1331         } else if (!info->mti_cross_ref) {
1332                 LASSERTF(!mdt_object_remote(parent),
1333                          "Parent "DFID" is on remote server\n",
1334                          PFID(mdt_object_fid(parent)));
1335         }
1336
1337         if (lu_name_is_valid(lname)) {
1338                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1339                 if (rc != 0) {
1340                         if (rc > 0)
1341                                 rc = 0;
1342                         RETURN(rc);
1343                 }
1344         }
1345
1346         if (info->mti_cross_ref) {
1347                 /* Only getattr on the child. Parent is on another node. */
1348                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1349                 child = parent;
1350                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1351                        "ldlm_rep=%p\n", PFID(mdt_object_fid(child)), ldlm_rep);
1352
1353                 if (is_resent) {
1354                         /* Do not take lock for resent case. */
1355                         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1356                         LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1357                                  lhc->mlh_reg_lh.cookie);
1358                         LASSERT(fid_res_name_eq(mdt_object_fid(child),
1359                                                 &lock->l_resource->lr_name));
1360                         LDLM_LOCK_PUT(lock);
1361                         rc = 0;
1362                 } else {
1363                         mdt_lock_handle_init(lhc);
1364                         mdt_lock_reg_init(lhc, LCK_PR);
1365
1366                         /*
1367                          * Object's name is on another MDS, no lookup or layout
1368                          * lock is needed here but update lock is.
1369                          */
1370                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1371                                         MDS_INODELOCK_LAYOUT);
1372                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1373
1374                         rc = mdt_object_lock(info, child, lhc, child_bits,
1375                                              MDT_LOCAL_LOCK);
1376                 }
1377                 if (rc == 0) {
1378                         /* Finally, we can get attr for child. */
1379                         if (!mdt_object_exists(child)) {
1380                                 LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1381                                                 &child->mot_obj,
1382                                              "remote object doesn't exist.\n");
1383                                 mdt_object_unlock(info, child, lhc, 1);
1384                                 RETURN(-ENOENT);
1385                         }
1386
1387                         mdt_set_capainfo(info, 0, mdt_object_fid(child),
1388                                          BYPASS_CAPA);
1389                         rc = mdt_getattr_internal(info, child, 0);
1390                         if (unlikely(rc != 0))
1391                                 mdt_object_unlock(info, child, lhc, 1);
1392                 }
1393                 RETURN(rc);
1394         }
1395
1396         if (lu_name_is_valid(lname)) {
1397                 /* step 1: lock parent only if parent is a directory */
1398                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1399                         lhp = &info->mti_lh[MDT_LH_PARENT];
1400                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1401                         rc = mdt_object_lock(info, parent, lhp,
1402                                              MDS_INODELOCK_UPDATE,
1403                                              MDT_LOCAL_LOCK);
1404                         if (unlikely(rc != 0))
1405                                 RETURN(rc);
1406                 }
1407
1408                 /* step 2: lookup child's fid by name */
1409                 fid_zero(child_fid);
1410                 rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1411                                 &info->mti_spec);
1412
1413                 if (rc != 0) {
1414                         if (rc == -ENOENT)
1415                                 mdt_set_disposition(info, ldlm_rep,
1416                                                     DISP_LOOKUP_NEG);
1417                         GOTO(out_parent, rc);
1418                 } else
1419                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1420         } else {
1421                 *child_fid = reqbody->fid2;
1422                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1423         }
1424
1425         /*
1426          *step 3: find the child object by fid & lock it.
1427          *        regardless if it is local or remote.
1428          *
1429          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1430          *      set parent dir fid the same as child fid in getattr by fid case
1431          *      we should not lu_object_find() the object again, could lead
1432          *      to hung if there is a concurrent unlink destroyed the object.
1433          */
1434         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1435                 mdt_object_get(info->mti_env, parent);
1436                 child = parent;
1437         } else {
1438                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1439                                         child_fid);
1440         }
1441
1442         if (unlikely(IS_ERR(child)))
1443                 GOTO(out_parent, rc = PTR_ERR(child));
1444         if (is_resent) {
1445                 /* Do not take lock for resent case. */
1446                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1447                 LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1448                          lhc->mlh_reg_lh.cookie);
1449
1450                 res_id = &lock->l_resource->lr_name;
1451                 if (!fid_res_name_eq(mdt_object_fid(child),
1452                                      &lock->l_resource->lr_name)) {
1453                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
1454                                                  &lock->l_resource->lr_name),
1455                                  "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1456                                  PLDLMRES(lock->l_resource),
1457                                  PFID(mdt_object_fid(parent)));
1458                         CWARN("Although resent, but still not get child lock"
1459                               "parent:"DFID" child:"DFID"\n",
1460                               PFID(mdt_object_fid(parent)),
1461                               PFID(mdt_object_fid(child)));
1462                         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1463                         LDLM_LOCK_PUT(lock);
1464                         GOTO(relock, 0);
1465                 }
1466                 LDLM_LOCK_PUT(lock);
1467                 rc = 0;
1468         } else {
1469                 bool try_layout = false;
1470
1471 relock:
1472                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1473                 mdt_lock_handle_init(lhc);
1474                 mdt_lock_reg_init(lhc, LCK_PR);
1475
1476                 if (!mdt_object_exists(child)) {
1477                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1478                                         &child->mot_obj,
1479                                         "Object doesn't exist!\n");
1480                         GOTO(out_child, rc = -ENOENT);
1481                 }
1482
1483                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1484                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1485                         struct md_attr *ma = &info->mti_attr;
1486
1487                         ma->ma_valid = 0;
1488                         ma->ma_need = MA_INODE;
1489                         rc = mdt_attr_get_complex(info, child, ma);
1490                         if (unlikely(rc != 0))
1491                                 GOTO(out_child, rc);
1492
1493                         /* If the file has not been changed for some time, we
1494                          * return not only a LOOKUP lock, but also an UPDATE
1495                          * lock and this might save us RPC on later STAT. For
1496                          * directories, it also let negative dentry cache start
1497                          * working for this dir. */
1498                         if (ma->ma_valid & MA_INODE &&
1499                             ma->ma_attr.la_valid & LA_CTIME &&
1500                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1501                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1502                                 child_bits |= MDS_INODELOCK_UPDATE;
1503                 }
1504
1505                 /* layout lock must be granted in a best-effort way
1506                  * for IT operations */
1507                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1508                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1509                     exp_connect_layout(info->mti_exp) &&
1510                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1511                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1512                         /* try to grant layout lock for regular file. */
1513                         try_layout = true;
1514                 }
1515
1516                 rc = 0;
1517                 if (try_layout) {
1518                         child_bits |= MDS_INODELOCK_LAYOUT;
1519                         /* try layout lock, it may fail to be granted due to
1520                          * contention at LOOKUP or UPDATE */
1521                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1522                                                  MDT_CROSS_LOCK)) {
1523                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1524                                 LASSERT(child_bits != 0);
1525                                 rc = mdt_object_lock(info, child, lhc,
1526                                                 child_bits, MDT_CROSS_LOCK);
1527                         } else {
1528                                 ma_need |= MA_LOV;
1529                         }
1530                 } else {
1531                         rc = mdt_object_lock(info, child, lhc, child_bits,
1532                                                 MDT_CROSS_LOCK);
1533                 }
1534                 if (unlikely(rc != 0))
1535                         GOTO(out_child, rc);
1536         }
1537
1538         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1539         /* Get MA_SOM attributes if update lock is given. */
1540         if (lock &&
1541             lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_UPDATE &&
1542             S_ISREG(lu_object_attr(&mdt_object_child(child)->mo_lu)))
1543                 ma_need |= MA_SOM;
1544
1545         /* finally, we can get attr for child. */
1546         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1547         rc = mdt_getattr_internal(info, child, ma_need);
1548         if (unlikely(rc != 0)) {
1549                 mdt_object_unlock(info, child, lhc, 1);
1550         } else if (lock) {
1551                 /* Debugging code. */
1552                 res_id = &lock->l_resource->lr_name;
1553                 LDLM_DEBUG(lock, "Returning lock to client");
1554                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1555                                          &lock->l_resource->lr_name),
1556                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1557                          PLDLMRES(lock->l_resource),
1558                          PFID(mdt_object_fid(child)));
1559                 if (mdt_object_exists(child) && !mdt_object_remote(child))
1560                         mdt_pack_size2body(info, child);
1561         }
1562         if (lock)
1563                 LDLM_LOCK_PUT(lock);
1564
1565         EXIT;
1566 out_child:
1567         mdt_object_put(info->mti_env, child);
1568 out_parent:
1569         if (lhp)
1570                 mdt_object_unlock(info, parent, lhp, 1);
1571         return rc;
1572 }
1573
1574 /* normal handler: should release the child lock */
1575 int mdt_getattr_name(struct tgt_session_info *tsi)
1576 {
1577         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1578         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1579         struct mdt_body        *reqbody;
1580         struct mdt_body        *repbody;
1581         int rc, rc2;
1582         ENTRY;
1583
1584         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1585         LASSERT(reqbody != NULL);
1586         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1587         LASSERT(repbody != NULL);
1588
1589         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1590         repbody->eadatasize = 0;
1591         repbody->aclsize = 0;
1592
1593         rc = mdt_init_ucred(info, reqbody);
1594         if (unlikely(rc))
1595                 GOTO(out_shrink, rc);
1596
1597         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1598         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1599                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1600                 lhc->mlh_reg_lh.cookie = 0;
1601         }
1602         mdt_exit_ucred(info);
1603         EXIT;
1604 out_shrink:
1605         mdt_client_compatibility(info);
1606         rc2 = mdt_fix_reply(info);
1607         if (rc == 0)
1608                 rc = rc2;
1609         mdt_thread_info_fini(info);
1610         return rc;
1611 }
1612
1613 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1614                          void *karg, void *uarg);
1615
1616 int mdt_set_info(struct tgt_session_info *tsi)
1617 {
1618         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1619         char                    *key;
1620         void                    *val;
1621         int                      keylen, vallen, rc = 0;
1622
1623         ENTRY;
1624
1625         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1626         if (key == NULL) {
1627                 DEBUG_REQ(D_HA, req, "no set_info key");
1628                 RETURN(err_serious(-EFAULT));
1629         }
1630
1631         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1632                                       RCL_CLIENT);
1633
1634         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1635         if (val == NULL) {
1636                 DEBUG_REQ(D_HA, req, "no set_info val");
1637                 RETURN(err_serious(-EFAULT));
1638         }
1639
1640         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1641                                       RCL_CLIENT);
1642
1643         /* Swab any part of val you need to here */
1644         if (KEY_IS(KEY_READ_ONLY)) {
1645                 spin_lock(&req->rq_export->exp_lock);
1646                 if (*(__u32 *)val)
1647                         *exp_connect_flags_ptr(req->rq_export) |=
1648                                 OBD_CONNECT_RDONLY;
1649                 else
1650                         *exp_connect_flags_ptr(req->rq_export) &=
1651                                 ~OBD_CONNECT_RDONLY;
1652                 spin_unlock(&req->rq_export->exp_lock);
1653         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1654                 struct changelog_setinfo *cs = val;
1655
1656                 if (vallen != sizeof(*cs)) {
1657                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1658                                tgt_name(tsi->tsi_tgt), vallen);
1659                         RETURN(-EINVAL);
1660                 }
1661                 if (ptlrpc_req_need_swab(req)) {
1662                         __swab64s(&cs->cs_recno);
1663                         __swab32s(&cs->cs_id);
1664                 }
1665
1666                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1667                                    vallen, val, NULL);
1668         } else {
1669                 RETURN(-EINVAL);
1670         }
1671         RETURN(rc);
1672 }
1673
1674 int mdt_readpage(struct tgt_session_info *tsi)
1675 {
1676         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1677         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1678         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1679         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1680         struct mdt_body         *repbody;
1681         int                      rc;
1682         int                      i;
1683
1684         ENTRY;
1685
1686         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1687                 RETURN(err_serious(-ENOMEM));
1688
1689         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1690         if (repbody == NULL || reqbody == NULL)
1691                 RETURN(err_serious(-EFAULT));
1692
1693         /*
1694          * prepare @rdpg before calling lower layers and transfer itself. Here
1695          * reqbody->size contains offset of where to start to read and
1696          * reqbody->nlink contains number bytes to read.
1697          */
1698         rdpg->rp_hash = reqbody->size;
1699         if (rdpg->rp_hash != reqbody->size) {
1700                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1701                        rdpg->rp_hash, reqbody->size);
1702                 RETURN(-EFAULT);
1703         }
1704
1705         rdpg->rp_attrs = reqbody->mode;
1706         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1707                 rdpg->rp_attrs |= LUDA_64BITHASH;
1708         rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
1709                                 exp_max_brw_size(tsi->tsi_exp));
1710         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1711                           PAGE_CACHE_SHIFT;
1712         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1713         if (rdpg->rp_pages == NULL)
1714                 RETURN(-ENOMEM);
1715
1716         for (i = 0; i < rdpg->rp_npages; ++i) {
1717                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1718                 if (rdpg->rp_pages[i] == NULL)
1719                         GOTO(free_rdpg, rc = -ENOMEM);
1720         }
1721
1722         /* call lower layers to fill allocated pages with directory data */
1723         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1724         if (rc < 0)
1725                 GOTO(free_rdpg, rc);
1726
1727         /* send pages to client */
1728         rc = tgt_sendpage(tsi, rdpg, rc);
1729
1730         EXIT;
1731 free_rdpg:
1732
1733         for (i = 0; i < rdpg->rp_npages; i++)
1734                 if (rdpg->rp_pages[i] != NULL)
1735                         __free_page(rdpg->rp_pages[i]);
1736         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1737
1738         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1739                 RETURN(0);
1740
1741         return rc;
1742 }
1743
1744 static int mdt_reint_internal(struct mdt_thread_info *info,
1745                               struct mdt_lock_handle *lhc,
1746                               __u32 op)
1747 {
1748         struct req_capsule      *pill = info->mti_pill;
1749         struct mdt_body         *repbody;
1750         int                      rc = 0, rc2;
1751
1752         ENTRY;
1753
1754         rc = mdt_reint_unpack(info, op);
1755         if (rc != 0) {
1756                 CERROR("Can't unpack reint, rc %d\n", rc);
1757                 RETURN(err_serious(rc));
1758         }
1759
1760         /* for replay (no_create) lmm is not needed, client has it already */
1761         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1762                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1763                                      info->mti_rr.rr_eadatalen);
1764
1765         /* llog cookies are always 0, the field is kept for compatibility */
1766         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1767                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1768
1769         rc = req_capsule_server_pack(pill);
1770         if (rc != 0) {
1771                 CERROR("Can't pack response, rc %d\n", rc);
1772                 RETURN(err_serious(rc));
1773         }
1774
1775         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1776                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1777                 LASSERT(repbody);
1778                 repbody->eadatasize = 0;
1779                 repbody->aclsize = 0;
1780         }
1781
1782         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1783
1784         /* for replay no cookkie / lmm need, because client have this already */
1785         if (info->mti_spec.no_create)
1786                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1787                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1788
1789         rc = mdt_init_ucred_reint(info);
1790         if (rc)
1791                 GOTO(out_shrink, rc);
1792
1793         rc = mdt_fix_attr_ucred(info, op);
1794         if (rc != 0)
1795                 GOTO(out_ucred, rc = err_serious(rc));
1796
1797         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1798                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1799                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1800                 GOTO(out_ucred, rc);
1801         }
1802         rc = mdt_reint_rec(info, lhc);
1803         EXIT;
1804 out_ucred:
1805         mdt_exit_ucred(info);
1806 out_shrink:
1807         mdt_client_compatibility(info);
1808         rc2 = mdt_fix_reply(info);
1809         if (rc == 0)
1810                 rc = rc2;
1811         return rc;
1812 }
1813
1814 static long mdt_reint_opcode(struct ptlrpc_request *req,
1815                              const struct req_format **fmt)
1816 {
1817         struct mdt_device       *mdt;
1818         struct mdt_rec_reint    *rec;
1819         long                     opc;
1820
1821         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1822         if (rec != NULL) {
1823                 opc = rec->rr_opcode;
1824                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1825                 if (opc < REINT_MAX && fmt[opc] != NULL)
1826                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1827                 else {
1828                         mdt = mdt_exp2dev(req->rq_export);
1829                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1830                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1831                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1832                         opc = err_serious(-EFAULT);
1833                 }
1834         } else {
1835                 opc = err_serious(-EFAULT);
1836         }
1837         return opc;
1838 }
1839
1840 int mdt_reint(struct tgt_session_info *tsi)
1841 {
1842         long opc;
1843         int  rc;
1844         static const struct req_format *reint_fmts[REINT_MAX] = {
1845                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1846                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1847                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1848                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1849                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1850                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1851                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1852                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1853                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1854         };
1855
1856         ENTRY;
1857
1858         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1859         if (opc >= 0) {
1860                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1861                 /*
1862                  * No lock possible here from client to pass it to reint code
1863                  * path.
1864                  */
1865                 rc = mdt_reint_internal(info, NULL, opc);
1866                 mdt_thread_info_fini(info);
1867         } else {
1868                 rc = opc;
1869         }
1870
1871         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1872         RETURN(rc);
1873 }
1874
1875 /* this should sync the whole device */
1876 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1877 {
1878         struct dt_device *dt = mdt->mdt_bottom;
1879         int rc;
1880         ENTRY;
1881
1882         rc = dt->dd_ops->dt_sync(env, dt);
1883         RETURN(rc);
1884 }
1885
1886 /* this should sync this object */
1887 static int mdt_object_sync(struct mdt_thread_info *info)
1888 {
1889         struct md_object *next;
1890         int rc;
1891         ENTRY;
1892
1893         if (!mdt_object_exists(info->mti_object)) {
1894                 CWARN("Non existing object  "DFID"!\n",
1895                       PFID(mdt_object_fid(info->mti_object)));
1896                 RETURN(-ESTALE);
1897         }
1898         next = mdt_object_child(info->mti_object);
1899         rc = mo_object_sync(info->mti_env, next);
1900
1901         RETURN(rc);
1902 }
1903
1904 int mdt_sync(struct tgt_session_info *tsi)
1905 {
1906         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1907         struct req_capsule      *pill = tsi->tsi_pill;
1908         struct mdt_body         *body;
1909         int                      rc;
1910
1911         ENTRY;
1912
1913         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1914                 RETURN(err_serious(-ENOMEM));
1915
1916         if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
1917                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1918         } else {
1919                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1920
1921                 /* sync an object */
1922                 rc = mdt_object_sync(info);
1923                 if (rc == 0) {
1924                         const struct lu_fid *fid;
1925                         struct lu_attr *la = &info->mti_attr.ma_attr;
1926
1927                         info->mti_attr.ma_need = MA_INODE;
1928                         info->mti_attr.ma_valid = 0;
1929                         rc = mdt_attr_get_complex(info, info->mti_object,
1930                                                   &info->mti_attr);
1931                         if (rc == 0) {
1932                                 body = req_capsule_server_get(pill,
1933                                                               &RMF_MDT_BODY);
1934                                 fid = mdt_object_fid(info->mti_object);
1935                                 mdt_pack_attr2body(info, body, la, fid);
1936                         }
1937                 }
1938                 mdt_thread_info_fini(info);
1939         }
1940         if (rc == 0)
1941                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1942
1943         RETURN(rc);
1944 }
1945
1946 /*
1947  * Handle quota control requests to consult current usage/limit, but also
1948  * to configure quota enforcement
1949  */
1950 int mdt_quotactl(struct tgt_session_info *tsi)
1951 {
1952         struct obd_export       *exp  = tsi->tsi_exp;
1953         struct req_capsule      *pill = tsi->tsi_pill;
1954         struct obd_quotactl     *oqctl, *repoqc;
1955         int                      id, rc;
1956         struct mdt_device       *mdt = mdt_exp2dev(exp);
1957         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1958         ENTRY;
1959
1960         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1961         if (oqctl == NULL)
1962                 RETURN(err_serious(-EPROTO));
1963
1964         rc = req_capsule_server_pack(pill);
1965         if (rc)
1966                 RETURN(err_serious(rc));
1967
1968         switch (oqctl->qc_cmd) {
1969         case Q_QUOTACHECK:
1970         case LUSTRE_Q_INVALIDATE:
1971         case LUSTRE_Q_FINVALIDATE:
1972         case Q_QUOTAON:
1973         case Q_QUOTAOFF:
1974         case Q_INITQUOTA:
1975                 /* deprecated, not used any more */
1976                 RETURN(-EOPNOTSUPP);
1977                 /* master quotactl */
1978         case Q_GETINFO:
1979         case Q_SETINFO:
1980         case Q_SETQUOTA:
1981         case Q_GETQUOTA:
1982                 if (qmt == NULL)
1983                         RETURN(-EOPNOTSUPP);
1984                 /* slave quotactl */
1985         case Q_GETOINFO:
1986         case Q_GETOQUOTA:
1987                 break;
1988         default:
1989                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1990                 RETURN(-EFAULT);
1991         }
1992
1993         /* map uid/gid for remote client */
1994         id = oqctl->qc_id;
1995         if (exp_connect_rmtclient(exp)) {
1996                 struct lustre_idmap_table *idmap;
1997
1998                 idmap = exp->exp_mdt_data.med_idmap;
1999
2000                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2001                              oqctl->qc_cmd != Q_GETINFO))
2002                         RETURN(-EPERM);
2003
2004                 if (oqctl->qc_type == USRQUOTA)
2005                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2006                                                      oqctl->qc_id);
2007                 else if (oqctl->qc_type == GRPQUOTA)
2008                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2009                                                      oqctl->qc_id);
2010                 else
2011                         RETURN(-EINVAL);
2012
2013                 if (id == CFS_IDMAP_NOTFOUND) {
2014                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2015                         RETURN(-EACCES);
2016                 }
2017         }
2018
2019         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2020         if (repoqc == NULL)
2021                 RETURN(err_serious(-EFAULT));
2022
2023         if (oqctl->qc_id != id)
2024                 swap(oqctl->qc_id, id);
2025
2026         switch (oqctl->qc_cmd) {
2027
2028         case Q_GETINFO:
2029         case Q_SETINFO:
2030         case Q_SETQUOTA:
2031         case Q_GETQUOTA:
2032                 /* forward quotactl request to QMT */
2033                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2034                 break;
2035
2036         case Q_GETOINFO:
2037         case Q_GETOQUOTA:
2038                 /* slave quotactl */
2039                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2040                                    oqctl);
2041                 break;
2042
2043         default:
2044                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2045                 RETURN(-EFAULT);
2046         }
2047
2048         if (oqctl->qc_id != id)
2049                 swap(oqctl->qc_id, id);
2050
2051         *repoqc = *oqctl;
2052         RETURN(rc);
2053 }
2054
2055 /** clone llog ctxt from child (mdd)
2056  * This allows remote llog (replicator) access.
2057  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2058  * context was originally set up, or we can handle them directly.
2059  * I choose the latter, but that means I need any llog
2060  * contexts set up by child to be accessable by the mdt.  So we clone the
2061  * context into our context list here.
2062  */
2063 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2064                                int idx)
2065 {
2066         struct md_device  *next = mdt->mdt_child;
2067         struct llog_ctxt *ctxt;
2068         int rc;
2069
2070         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2071                 return 0;
2072
2073         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2074         if (rc || ctxt == NULL) {
2075                 return 0;
2076         }
2077
2078         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2079         if (rc)
2080                 CERROR("Can't set mdt ctxt %d\n", rc);
2081
2082         return rc;
2083 }
2084
2085 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2086                                  struct mdt_device *mdt, int idx)
2087 {
2088         struct llog_ctxt *ctxt;
2089
2090         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2091         if (ctxt == NULL)
2092                 return 0;
2093         /* Put once for the get we just did, and once for the clone */
2094         llog_ctxt_put(ctxt);
2095         llog_ctxt_put(ctxt);
2096         return 0;
2097 }
2098
2099 /*
2100  * sec context handlers
2101  */
2102 int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2103 {
2104         int rc;
2105
2106         rc = mdt_handle_idmap(tsi);
2107         if (unlikely(rc)) {
2108                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2109                 __u32                    opc;
2110
2111                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2112                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2113                         sptlrpc_svc_ctx_invalidate(req);
2114         }
2115
2116         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2117
2118         return rc;
2119 }
2120
2121 /*
2122  * quota request handlers
2123  */
2124 int mdt_quota_dqacq(struct tgt_session_info *tsi)
2125 {
2126         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2127         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2128         int                      rc;
2129         ENTRY;
2130
2131         if (qmt == NULL)
2132                 RETURN(err_serious(-EOPNOTSUPP));
2133
2134         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2135         RETURN(rc);
2136 }
2137
2138 struct mdt_object *mdt_object_new(const struct lu_env *env,
2139                                   struct mdt_device *d,
2140                                   const struct lu_fid *f)
2141 {
2142         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2143         struct lu_object *o;
2144         struct mdt_object *m;
2145         ENTRY;
2146
2147         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2148         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2149         if (unlikely(IS_ERR(o)))
2150                 m = (struct mdt_object *)o;
2151         else
2152                 m = mdt_obj(o);
2153         RETURN(m);
2154 }
2155
2156 struct mdt_object *mdt_object_find(const struct lu_env *env,
2157                                    struct mdt_device *d,
2158                                    const struct lu_fid *f)
2159 {
2160         struct lu_object *o;
2161         struct mdt_object *m;
2162         ENTRY;
2163
2164         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2165         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2166         if (unlikely(IS_ERR(o)))
2167                 m = (struct mdt_object *)o;
2168         else
2169                 m = mdt_obj(o);
2170
2171         RETURN(m);
2172 }
2173
2174 /**
2175  * Asyncronous commit for mdt device.
2176  *
2177  * Pass asynchonous commit call down the MDS stack.
2178  *
2179  * \param env environment
2180  * \param mdt the mdt device
2181  */
2182 static void mdt_device_commit_async(const struct lu_env *env,
2183                                     struct mdt_device *mdt)
2184 {
2185         struct dt_device *dt = mdt->mdt_bottom;
2186         int rc;
2187
2188         rc = dt->dd_ops->dt_commit_async(env, dt);
2189         if (unlikely(rc != 0))
2190                 CWARN("async commit start failed with rc = %d", rc);
2191 }
2192
2193 /**
2194  * Mark the lock as "synchonous".
2195  *
2196  * Mark the lock to deffer transaction commit to the unlock time.
2197  *
2198  * \param lock the lock to mark as "synchonous"
2199  *
2200  * \see mdt_is_lock_sync
2201  * \see mdt_save_lock
2202  */
2203 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2204 {
2205         lock->l_ast_data = (void*)1;
2206 }
2207
2208 /**
2209  * Check whehter the lock "synchonous" or not.
2210  *
2211  * \param lock the lock to check
2212  * \retval 1 the lock is "synchonous"
2213  * \retval 0 the lock isn't "synchronous"
2214  *
2215  * \see mdt_set_lock_sync
2216  * \see mdt_save_lock
2217  */
2218 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2219 {
2220         return lock->l_ast_data != NULL;
2221 }
2222
2223 /**
2224  * Blocking AST for mdt locks.
2225  *
2226  * Starts transaction commit if in case of COS lock conflict or
2227  * deffers such a commit to the mdt_save_lock.
2228  *
2229  * \param lock the lock which blocks a request or cancelling lock
2230  * \param desc unused
2231  * \param data unused
2232  * \param flag indicates whether this cancelling or blocking callback
2233  * \retval 0
2234  * \see ldlm_blocking_ast_nocheck
2235  */
2236 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2237                      void *data, int flag)
2238 {
2239         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2240         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2241         int rc;
2242         ENTRY;
2243
2244         if (flag == LDLM_CB_CANCELING)
2245                 RETURN(0);
2246         lock_res_and_lock(lock);
2247         if (lock->l_blocking_ast != mdt_blocking_ast) {
2248                 unlock_res_and_lock(lock);
2249                 RETURN(0);
2250         }
2251         if (mdt_cos_is_enabled(mdt) &&
2252             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2253             lock->l_blocking_lock != NULL &&
2254             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2255                 mdt_set_lock_sync(lock);
2256         }
2257         rc = ldlm_blocking_ast_nocheck(lock);
2258
2259         /* There is no lock conflict if l_blocking_lock == NULL,
2260          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2261          * when the last reference to a local lock was released */
2262         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2263                 struct lu_env env;
2264
2265                 rc = lu_env_init(&env, LCT_LOCAL);
2266                 if (unlikely(rc != 0))
2267                         CWARN("lu_env initialization failed with rc = %d,"
2268                               "cannot start asynchronous commit\n", rc);
2269                 else
2270                         mdt_device_commit_async(&env, mdt);
2271                 lu_env_fini(&env);
2272         }
2273         RETURN(rc);
2274 }
2275
2276 /* Used for cross-MDT lock */
2277 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2278                             void *data, int flag)
2279 {
2280         struct lustre_handle lockh;
2281         int               rc;
2282
2283         switch (flag) {
2284         case LDLM_CB_BLOCKING:
2285                 ldlm_lock2handle(lock, &lockh);
2286                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2287                 if (rc < 0) {
2288                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2289                         RETURN(rc);
2290                 }
2291                 break;
2292         case LDLM_CB_CANCELING:
2293                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2294                 break;
2295         default:
2296                 LBUG();
2297         }
2298         RETURN(0);
2299 }
2300
2301 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2302                            struct mdt_object *o, struct lustre_handle *lh,
2303                            ldlm_mode_t mode, __u64 ibits)
2304 {
2305         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2306         ldlm_policy_data_t *policy = &mti->mti_policy;
2307         int rc = 0;
2308         ENTRY;
2309
2310         LASSERT(mdt_object_remote(o));
2311
2312         LASSERT(ibits & MDS_INODELOCK_UPDATE);
2313
2314         memset(einfo, 0, sizeof(*einfo));
2315         einfo->ei_type = LDLM_IBITS;
2316         einfo->ei_mode = mode;
2317         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2318         einfo->ei_cb_cp = ldlm_completion_ast;
2319         einfo->ei_enq_slave = 0;
2320
2321         memset(policy, 0, sizeof(*policy));
2322         policy->l_inodebits.bits = ibits;
2323
2324         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2325                             policy);
2326         RETURN(rc);
2327 }
2328
2329 static int mdt_object_lock0(struct mdt_thread_info *info, struct mdt_object *o,
2330                             struct mdt_lock_handle *lh, __u64 ibits,
2331                             bool nonblock, int locality)
2332 {
2333         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2334         ldlm_policy_data_t *policy = &info->mti_policy;
2335         struct ldlm_res_id *res_id = &info->mti_res_id;
2336         __u64 dlmflags;
2337         int rc;
2338         ENTRY;
2339
2340         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2341         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2342         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2343         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2344
2345         if (mdt_object_remote(o)) {
2346                 if (locality == MDT_CROSS_LOCK) {
2347                         ibits &= ~(MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM |
2348                                    MDS_INODELOCK_LAYOUT);
2349                         ibits |= MDS_INODELOCK_LOOKUP;
2350                 } else {
2351                         LASSERTF(!(ibits &
2352                                  (MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM |
2353                                   MDS_INODELOCK_LAYOUT)),
2354                                 "%s: wrong bit "LPX64" for remote obj "DFID"\n",
2355                                 mdt_obd_name(info->mti_mdt), ibits,
2356                                 PFID(mdt_object_fid(o)));
2357                         LASSERT(ibits & MDS_INODELOCK_LOOKUP);
2358                 }
2359                 /* No PDO lock on remote object */
2360                 LASSERT(lh->mlh_type != MDT_PDO_LOCK);
2361         }
2362
2363         if (lh->mlh_type == MDT_PDO_LOCK) {
2364                 /* check for exists after object is locked */
2365                 if (mdt_object_exists(o) == 0) {
2366                         /* Non-existent object shouldn't have PDO lock */
2367                         RETURN(-ESTALE);
2368                 } else {
2369                         /* Non-dir object shouldn't have PDO lock */
2370                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2371                                 RETURN(-ENOTDIR);
2372                 }
2373         }
2374
2375         memset(policy, 0, sizeof(*policy));
2376         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2377
2378         dlmflags = LDLM_FL_ATOMIC_CB;
2379         if (nonblock)
2380                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2381
2382         /*
2383          * Take PDO lock on whole directory and build correct @res_id for lock
2384          * on part of directory.
2385          */
2386         if (lh->mlh_pdo_hash != 0) {
2387                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2388                 mdt_lock_pdo_mode(info, o, lh);
2389                 if (lh->mlh_pdo_mode != LCK_NL) {
2390                         /*
2391                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2392                          * is never going to be sent to client and we do not
2393                          * want it slowed down due to possible cancels.
2394                          */
2395                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2396                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2397                                           policy, res_id, dlmflags,
2398                                           &info->mti_exp->exp_handle.h_cookie);
2399                         if (unlikely(rc))
2400                                 RETURN(rc);
2401                 }
2402
2403                 /*
2404                  * Finish res_id initializing by name hash marking part of
2405                  * directory which is taking modification.
2406                  */
2407                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2408         }
2409
2410         policy->l_inodebits.bits = ibits;
2411
2412         /*
2413          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2414          * going to be sent to client. If it is - mdt_intent_policy() path will
2415          * fix it up and turn FL_LOCAL flag off.
2416          */
2417         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2418                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2419                           &info->mti_exp->exp_handle.h_cookie);
2420         if (rc)
2421                 mdt_object_unlock(info, o, lh, 1);
2422         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2423                  lh->mlh_pdo_hash != 0 &&
2424                  (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX)) {
2425                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2426         }
2427
2428         RETURN(rc);
2429 }
2430
2431 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2432                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2433 {
2434         return mdt_object_lock0(info, o, lh, ibits, false, locality);
2435 }
2436
2437 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2438                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2439 {
2440         struct mdt_lock_handle tmp = *lh;
2441         int rc;
2442
2443         rc = mdt_object_lock0(info, o, &tmp, ibits, true, locality);
2444         if (rc == 0)
2445                 *lh = tmp;
2446
2447         return rc == 0;
2448 }
2449
2450 /**
2451  * Save a lock within request object.
2452  *
2453  * Keep the lock referenced until whether client ACK or transaction
2454  * commit happens or release the lock immediately depending on input
2455  * parameters. If COS is ON, a write lock is converted to COS lock
2456  * before saving.
2457  *
2458  * \param info thead info object
2459  * \param h lock handle
2460  * \param mode lock mode
2461  * \param decref force immediate lock releasing
2462  */
2463 static
2464 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2465                    ldlm_mode_t mode, int decref)
2466 {
2467         ENTRY;
2468
2469         if (lustre_handle_is_used(h)) {
2470                 if (decref || !info->mti_has_trans ||
2471                     !(mode & (LCK_PW | LCK_EX))){
2472                         mdt_fid_unlock(h, mode);
2473                 } else {
2474                         struct mdt_device *mdt = info->mti_mdt;
2475                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2476                         struct ptlrpc_request *req = mdt_info_req(info);
2477                         int no_ack = 0;
2478
2479                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2480                                  h->cookie);
2481                         /* there is no request if mdt_object_unlock() is called
2482                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2483                         if (likely(req != NULL)) {
2484                                 CDEBUG(D_HA, "request = %p reply state = %p"
2485                                        " transno = "LPD64"\n", req,
2486                                        req->rq_reply_state, req->rq_transno);
2487                                 if (mdt_cos_is_enabled(mdt)) {
2488                                         no_ack = 1;
2489                                         ldlm_lock_downgrade(lock, LCK_COS);
2490                                         mode = LCK_COS;
2491                                 }
2492                                 ptlrpc_save_lock(req, h, mode, no_ack);
2493                         } else {
2494                                 ldlm_lock_decref(h, mode);
2495                         }
2496                         if (mdt_is_lock_sync(lock)) {
2497                                 CDEBUG(D_HA, "found sync-lock,"
2498                                        " async commit started\n");
2499                                 mdt_device_commit_async(info->mti_env,
2500                                                         mdt);
2501                         }
2502                         LDLM_LOCK_PUT(lock);
2503                 }
2504                 h->cookie = 0ull;
2505         }
2506
2507         EXIT;
2508 }
2509
2510 /**
2511  * Unlock mdt object.
2512  *
2513  * Immeditely release the regular lock and the PDO lock or save the
2514  * lock in reqeuest and keep them referenced until client ACK or
2515  * transaction commit.
2516  *
2517  * \param info thread info object
2518  * \param o mdt object
2519  * \param lh mdt lock handle referencing regular and PDO locks
2520  * \param decref force immediate lock releasing
2521  */
2522 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2523                        struct mdt_lock_handle *lh, int decref)
2524 {
2525         ENTRY;
2526
2527         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2528         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2529
2530         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2531                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2532
2533         EXIT;
2534 }
2535
2536 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2537                                         const struct lu_fid *f,
2538                                         struct mdt_lock_handle *lh,
2539                                         __u64 ibits)
2540 {
2541         struct mdt_object *o;
2542
2543         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2544         if (!IS_ERR(o)) {
2545                 int rc;
2546
2547                 rc = mdt_object_lock(info, o, lh, ibits,
2548                                      MDT_LOCAL_LOCK);
2549                 if (rc != 0) {
2550                         mdt_object_put(info->mti_env, o);
2551                         o = ERR_PTR(rc);
2552                 }
2553         }
2554         return o;
2555 }
2556
2557 void mdt_object_unlock_put(struct mdt_thread_info * info,
2558                            struct mdt_object * o,
2559                            struct mdt_lock_handle *lh,
2560                            int decref)
2561 {
2562         mdt_object_unlock(info, o, lh, decref);
2563         mdt_object_put(info->mti_env, o);
2564 }
2565
2566 /*
2567  * Generic code handling requests that have struct mdt_body passed in:
2568  *
2569  *  - extract mdt_body from request and save it in @info, if present;
2570  *
2571  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2572  *  @info;
2573  *
2574  *  - if HABEO_CORPUS flag is set for this request type check whether object
2575  *  actually exists on storage (lu_object_exists()).
2576  *
2577  */
2578 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2579 {
2580         const struct mdt_body    *body;
2581         struct mdt_object        *obj;
2582         const struct lu_env      *env;
2583         struct req_capsule       *pill;
2584         int                       rc;
2585         ENTRY;
2586
2587         env = info->mti_env;
2588         pill = info->mti_pill;
2589
2590         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2591         if (body == NULL)
2592                 RETURN(-EFAULT);
2593
2594         if (!(body->valid & OBD_MD_FLID))
2595                 RETURN(0);
2596
2597         if (!fid_is_sane(&body->fid1)) {
2598                 CERROR("Invalid fid: "DFID"\n", PFID(&body->fid1));
2599                 RETURN(-EINVAL);
2600         }
2601
2602         /*
2603          * Do not get size or any capa fields before we check that request
2604          * contains capa actually. There are some requests which do not, for
2605          * instance MDS_IS_SUBDIR.
2606          */
2607         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2608             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2609                 mdt_set_capainfo(info, 0, &body->fid1,
2610                                  req_capsule_client_get(pill, &RMF_CAPA1));
2611
2612         obj = mdt_object_find(env, info->mti_mdt, &body->fid1);
2613         if (!IS_ERR(obj)) {
2614                 if ((flags & HABEO_CORPUS) &&
2615                     !mdt_object_exists(obj)) {
2616                         mdt_object_put(env, obj);
2617                         /* for capability renew ENOENT will be handled in
2618                          * mdt_renew_capa */
2619                         if (body->valid & OBD_MD_FLOSSCAPA)
2620                                 rc = 0;
2621                         else
2622                                 rc = -ENOENT;
2623                 } else {
2624                         info->mti_object = obj;
2625                         rc = 0;
2626                 }
2627         } else
2628                 rc = PTR_ERR(obj);
2629
2630         RETURN(rc);
2631 }
2632
2633 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2634 {
2635         struct req_capsule *pill = info->mti_pill;
2636         int rc;
2637         ENTRY;
2638
2639         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2640                 rc = mdt_body_unpack(info, flags);
2641         else
2642                 rc = 0;
2643
2644         if (rc == 0 && (flags & HABEO_REFERO)) {
2645                 /* Pack reply. */
2646                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2647                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2648                                              info->mti_body->eadatasize);
2649                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2650                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2651                                              RCL_SERVER, 0);
2652
2653                 rc = req_capsule_server_pack(pill);
2654         }
2655         RETURN(rc);
2656 }
2657
2658 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2659 {
2660         struct md_device *next = m->mdt_child;
2661
2662         return next->md_ops->mdo_init_capa_ctxt(env, next,
2663                                                 m->mdt_lut.lut_mds_capa,
2664                                                 m->mdt_capa_timeout,
2665                                                 m->mdt_capa_alg,
2666                                                 m->mdt_capa_keys);
2667 }
2668
2669 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2670 {
2671         lh->mlh_type = MDT_NUL_LOCK;
2672         lh->mlh_reg_lh.cookie = 0ull;
2673         lh->mlh_reg_mode = LCK_MINMODE;
2674         lh->mlh_pdo_lh.cookie = 0ull;
2675         lh->mlh_pdo_mode = LCK_MINMODE;
2676         lh->mlh_rreg_lh.cookie = 0ull;
2677         lh->mlh_rreg_mode = LCK_MINMODE;
2678 }
2679
2680 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2681 {
2682         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2683         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2684 }
2685
2686 /*
2687  * Initialize fields of struct mdt_thread_info. Other fields are left in
2688  * uninitialized state, because it's too expensive to zero out whole
2689  * mdt_thread_info (> 1K) on each request arrival.
2690  */
2691 void mdt_thread_info_init(struct ptlrpc_request *req,
2692                           struct mdt_thread_info *info)
2693 {
2694         int i;
2695
2696         info->mti_pill = &req->rq_pill;
2697
2698         /* lock handle */
2699         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2700                 mdt_lock_handle_init(&info->mti_lh[i]);
2701
2702         /* mdt device: it can be NULL while CONNECT */
2703         if (req->rq_export) {
2704                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2705                 info->mti_exp = req->rq_export;
2706         } else
2707                 info->mti_mdt = NULL;
2708         info->mti_env = req->rq_svc_thread->t_env;
2709         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2710
2711         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2712         info->mti_big_buf = LU_BUF_NULL;
2713         info->mti_body = NULL;
2714         info->mti_object = NULL;
2715         info->mti_dlm_req = NULL;
2716         info->mti_has_trans = 0;
2717         info->mti_cross_ref = 0;
2718         info->mti_opdata = 0;
2719         info->mti_big_lmm_used = 0;
2720
2721         info->mti_spec.no_create = 0;
2722         info->mti_spec.sp_rm_entry = 0;
2723
2724         info->mti_spec.u.sp_ea.eadata = NULL;
2725         info->mti_spec.u.sp_ea.eadatalen = 0;
2726 }
2727
2728 void mdt_thread_info_fini(struct mdt_thread_info *info)
2729 {
2730         int i;
2731
2732         if (info->mti_object != NULL) {
2733                 mdt_object_put(info->mti_env, info->mti_object);
2734                 info->mti_object = NULL;
2735         }
2736
2737         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2738                 mdt_lock_handle_fini(&info->mti_lh[i]);
2739         info->mti_env = NULL;
2740         info->mti_pill = NULL;
2741         info->mti_exp = NULL;
2742
2743         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2744                 lu_buf_free(&info->mti_big_buf);
2745 }
2746
2747 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2748 {
2749         struct mdt_thread_info  *mti;
2750         struct lustre_capa      *lc;
2751
2752         mti = mdt_th_info(tsi->tsi_env);
2753         LASSERT(mti != NULL);
2754
2755         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2756         if (tsi->tsi_corpus != NULL) {
2757                 struct req_capsule *pill = tsi->tsi_pill;
2758
2759                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2760                 lu_object_get(tsi->tsi_corpus);
2761
2762                 /*
2763                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2764                  * due to mdt_set_capainfo().
2765                  */
2766                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2767                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2768                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2769                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
2770                 }
2771         }
2772         mti->mti_body = tsi->tsi_mdt_body;
2773         mti->mti_dlm_req = tsi->tsi_dlm_req;
2774
2775         return mti;
2776 }
2777
2778 int mdt_tgt_connect(struct tgt_session_info *tsi)
2779 {
2780         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2781         int                      rc;
2782
2783         ENTRY;
2784
2785         rc = tgt_connect(tsi);
2786         if (rc != 0)
2787                 RETURN(rc);
2788
2789         rc = mdt_init_idmap(tsi);
2790         if (rc != 0)
2791                 GOTO(err, rc);
2792         RETURN(0);
2793 err:
2794         obd_disconnect(class_export_get(req->rq_export));
2795         return rc;
2796 }
2797
2798 enum mdt_it_code {
2799         MDT_IT_OPEN,
2800         MDT_IT_OCREAT,
2801         MDT_IT_CREATE,
2802         MDT_IT_GETATTR,
2803         MDT_IT_READDIR,
2804         MDT_IT_LOOKUP,
2805         MDT_IT_UNLINK,
2806         MDT_IT_TRUNC,
2807         MDT_IT_GETXATTR,
2808         MDT_IT_LAYOUT,
2809         MDT_IT_QUOTA,
2810         MDT_IT_NR
2811 };
2812
2813 static int mdt_intent_getattr(enum mdt_it_code opcode,
2814                               struct mdt_thread_info *info,
2815                               struct ldlm_lock **,
2816                               __u64);
2817
2818 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2819                                 struct mdt_thread_info *info,
2820                                 struct ldlm_lock **lockp,
2821                                 __u64 flags);
2822
2823 static int mdt_intent_layout(enum mdt_it_code opcode,
2824                              struct mdt_thread_info *info,
2825                              struct ldlm_lock **,
2826                              __u64);
2827 static int mdt_intent_reint(enum mdt_it_code opcode,
2828                             struct mdt_thread_info *info,
2829                             struct ldlm_lock **,
2830                             __u64);
2831
2832 static struct mdt_it_flavor {
2833         const struct req_format *it_fmt;
2834         __u32                    it_flags;
2835         int                    (*it_act)(enum mdt_it_code ,
2836                                          struct mdt_thread_info *,
2837                                          struct ldlm_lock **,
2838                                          __u64);
2839         long                     it_reint;
2840 } mdt_it_flavor[] = {
2841         [MDT_IT_OPEN]     = {
2842                 .it_fmt   = &RQF_LDLM_INTENT,
2843                 /*.it_flags = HABEO_REFERO,*/
2844                 .it_flags = 0,
2845                 .it_act   = mdt_intent_reint,
2846                 .it_reint = REINT_OPEN
2847         },
2848         [MDT_IT_OCREAT]   = {
2849                 .it_fmt   = &RQF_LDLM_INTENT,
2850                 /*
2851                  * OCREAT is not a MUTABOR request as if the file
2852                  * already exists.
2853                  * We do the extra check of OBD_CONNECT_RDONLY in
2854                  * mdt_reint_open() when we really need to create
2855                  * the object.
2856                  */
2857                 .it_flags = 0,
2858                 .it_act   = mdt_intent_reint,
2859                 .it_reint = REINT_OPEN
2860         },
2861         [MDT_IT_CREATE]   = {
2862                 .it_fmt   = &RQF_LDLM_INTENT,
2863                 .it_flags = MUTABOR,
2864                 .it_act   = mdt_intent_reint,
2865                 .it_reint = REINT_CREATE
2866         },
2867         [MDT_IT_GETATTR]  = {
2868                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2869                 .it_flags = HABEO_REFERO,
2870                 .it_act   = mdt_intent_getattr
2871         },
2872         [MDT_IT_READDIR]  = {
2873                 .it_fmt   = NULL,
2874                 .it_flags = 0,
2875                 .it_act   = NULL
2876         },
2877         [MDT_IT_LOOKUP]   = {
2878                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2879                 .it_flags = HABEO_REFERO,
2880                 .it_act   = mdt_intent_getattr
2881         },
2882         [MDT_IT_UNLINK]   = {
2883                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2884                 .it_flags = MUTABOR,
2885                 .it_act   = NULL,
2886                 .it_reint = REINT_UNLINK
2887         },
2888         [MDT_IT_TRUNC]    = {
2889                 .it_fmt   = NULL,
2890                 .it_flags = MUTABOR,
2891                 .it_act   = NULL
2892         },
2893         [MDT_IT_GETXATTR] = {
2894                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2895                 .it_flags = HABEO_CORPUS,
2896                 .it_act   = mdt_intent_getxattr
2897         },
2898         [MDT_IT_LAYOUT] = {
2899                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2900                 .it_flags = 0,
2901                 .it_act   = mdt_intent_layout
2902         }
2903 };
2904
2905 int mdt_intent_lock_replace(struct mdt_thread_info *info,
2906                             struct ldlm_lock **lockp,
2907                             struct ldlm_lock *new_lock,
2908                             struct mdt_lock_handle *lh,
2909                             __u64 flags)
2910 {
2911         struct ptlrpc_request  *req = mdt_info_req(info);
2912         struct ldlm_lock       *lock = *lockp;
2913
2914         /*
2915          * Get new lock only for cases when possible resent did not find any
2916          * lock.
2917          */
2918         if (new_lock == NULL)
2919                 new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2920
2921         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2922                 lh->mlh_reg_lh.cookie = 0;
2923                 RETURN(0);
2924         }
2925
2926         LASSERTF(new_lock != NULL,
2927                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2928
2929         /*
2930          * If we've already given this lock to a client once, then we should
2931          * have no readers or writers.  Otherwise, we should have one reader
2932          * _or_ writer ref (which will be zeroed below) before returning the
2933          * lock to a client.
2934          */
2935         if (new_lock->l_export == req->rq_export) {
2936                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2937         } else {
2938                 LASSERT(new_lock->l_export == NULL);
2939                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2940         }
2941
2942         *lockp = new_lock;
2943
2944         if (new_lock->l_export == req->rq_export) {
2945                 /*
2946                  * Already gave this to the client, which means that we
2947                  * reconstructed a reply.
2948                  */
2949                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2950                         MSG_RESENT);
2951                 lh->mlh_reg_lh.cookie = 0;
2952                 RETURN(ELDLM_LOCK_REPLACED);
2953         }
2954
2955         /*
2956          * Fixup the lock to be given to the client.
2957          */
2958         lock_res_and_lock(new_lock);
2959         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
2960          * possible blocking AST. */
2961         while (new_lock->l_readers > 0) {
2962                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
2963                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2964                 new_lock->l_readers--;
2965         }
2966         while (new_lock->l_writers > 0) {
2967                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
2968                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2969                 new_lock->l_writers--;
2970         }
2971
2972         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
2973         new_lock->l_blocking_ast = lock->l_blocking_ast;
2974         new_lock->l_completion_ast = lock->l_completion_ast;
2975         new_lock->l_remote_handle = lock->l_remote_handle;
2976         new_lock->l_flags &= ~LDLM_FL_LOCAL;
2977
2978         unlock_res_and_lock(new_lock);
2979
2980         cfs_hash_add(new_lock->l_export->exp_lock_hash,
2981                      &new_lock->l_remote_handle,
2982                      &new_lock->l_exp_hash);
2983
2984         LDLM_LOCK_RELEASE(new_lock);
2985         lh->mlh_reg_lh.cookie = 0;
2986
2987         RETURN(ELDLM_LOCK_REPLACED);
2988 }
2989
2990 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
2991                                     struct ldlm_lock *new_lock,
2992                                     struct ldlm_lock **old_lock,
2993                                     struct mdt_lock_handle *lh,
2994                                     enum mdt_it_code opcode)
2995 {
2996         struct ptlrpc_request  *req = mdt_info_req(info);
2997         struct obd_export      *exp = req->rq_export;
2998         struct lustre_handle    remote_hdl;
2999         struct ldlm_request    *dlmreq;
3000         struct ldlm_lock       *lock;
3001
3002         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3003                 return;
3004
3005         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3006         remote_hdl = dlmreq->lock_handle[0];
3007         /* If the client does not require open lock, it does not need to
3008          * search lock in exp_lock_hash, since the server thread will
3009          * make sure the lock will be released, and the resend request
3010          * can always re-enqueue the lock */
3011         if ((opcode != MDT_IT_OPEN) || (opcode == MDT_IT_OPEN &&
3012             info->mti_spec.sp_cr_flags & MDS_OPEN_LOCK)) {
3013                 /* In the function below, .hs_keycmp resolves to
3014                  * ldlm_export_lock_keycmp() */
3015                 /* coverity[overrun-buffer-val] */
3016                 lock = cfs_hash_lookup(exp->exp_lock_hash, &remote_hdl);
3017                 if (lock) {
3018                         lock_res_and_lock(lock);
3019                         if (lock != new_lock) {
3020                                 lh->mlh_reg_lh.cookie = lock->l_handle.h_cookie;
3021                                 lh->mlh_reg_mode = lock->l_granted_mode;
3022
3023                                 LDLM_DEBUG(lock, "Restoring lock cookie");
3024                                 DEBUG_REQ(D_DLMTRACE, req,
3025                                           "restoring lock cookie "LPX64,
3026                                           lh->mlh_reg_lh.cookie);
3027                                 if (old_lock)
3028                                         *old_lock = LDLM_LOCK_GET(lock);
3029                                 cfs_hash_put(exp->exp_lock_hash,
3030                                              &lock->l_exp_hash);
3031                                 unlock_res_and_lock(lock);
3032                                 return;
3033                         }
3034                         cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
3035                         unlock_res_and_lock(lock);
3036                 }
3037         }
3038         /*
3039          * If the xid matches, then we know this is a resent request, and allow
3040          * it. (It's probably an OPEN, for which we don't send a lock.
3041          */
3042         if (req_xid_is_last(req))
3043                 return;
3044
3045         /*
3046          * This remote handle isn't enqueued, so we never received or processed
3047          * this request.  Clear MSG_RESENT, because it can be handled like any
3048          * normal request now.
3049          */
3050         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3051
3052         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3053                   remote_hdl.cookie);
3054 }
3055
3056 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3057                                 struct mdt_thread_info *info,
3058                                 struct ldlm_lock **lockp,
3059                                 __u64 flags)
3060 {
3061         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3062         struct ldlm_reply      *ldlm_rep = NULL;
3063         int rc, grc;
3064
3065         /*
3066          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3067          * (for the resend case) or a new lock. Below we will use it to
3068          * replace the original lock.
3069          */
3070         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3071         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3072                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3073                 rc = mdt_object_lock(info, info->mti_object, lhc,
3074                                         MDS_INODELOCK_XATTR,
3075                                         MDT_LOCAL_LOCK);
3076                 if (rc)
3077                         return rc;
3078         }
3079
3080         grc = mdt_getxattr(info);
3081
3082         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3083
3084         if (mdt_info_req(info)->rq_repmsg != NULL)
3085                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3086         if (ldlm_rep == NULL)
3087                 RETURN(err_serious(-EFAULT));
3088
3089         ldlm_rep->lock_policy_res2 = grc;
3090
3091         return rc;
3092 }
3093
3094 static int mdt_intent_getattr(enum mdt_it_code opcode,
3095                               struct mdt_thread_info *info,
3096                               struct ldlm_lock **lockp,
3097                               __u64 flags)
3098 {
3099         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3100         struct ldlm_lock       *new_lock = NULL;
3101         __u64                   child_bits;
3102         struct ldlm_reply      *ldlm_rep;
3103         struct ptlrpc_request  *req;
3104         struct mdt_body        *reqbody;
3105         struct mdt_body        *repbody;
3106         int                     rc, rc2;
3107         ENTRY;
3108
3109         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3110         LASSERT(reqbody);
3111
3112         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3113         LASSERT(repbody);
3114
3115         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
3116         repbody->eadatasize = 0;
3117         repbody->aclsize = 0;
3118
3119         switch (opcode) {
3120         case MDT_IT_LOOKUP:
3121                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3122                 break;
3123         case MDT_IT_GETATTR:
3124                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3125                              MDS_INODELOCK_PERM;
3126                 break;
3127         default:
3128                 CERROR("Unsupported intent (%d)\n", opcode);
3129                 GOTO(out_shrink, rc = -EINVAL);
3130         }
3131
3132         rc = mdt_init_ucred(info, reqbody);
3133         if (rc)
3134                 GOTO(out_shrink, rc);
3135
3136         req = info->mti_pill->rc_req;
3137         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3138         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3139
3140         /* Get lock from request for possible resent case. */
3141         mdt_intent_fixup_resent(info, *lockp, &new_lock, lhc, opcode);
3142
3143         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3144         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3145
3146         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3147                 ldlm_rep->lock_policy_res2 = 0;
3148         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3149             ldlm_rep->lock_policy_res2) {
3150                 lhc->mlh_reg_lh.cookie = 0ull;
3151                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3152         }
3153
3154         rc = mdt_intent_lock_replace(info, lockp, new_lock, lhc, flags);
3155         EXIT;
3156 out_ucred:
3157         mdt_exit_ucred(info);
3158 out_shrink:
3159         mdt_client_compatibility(info);
3160         rc2 = mdt_fix_reply(info);
3161         if (rc == 0)
3162                 rc = rc2;
3163         return rc;
3164 }
3165
3166 static int mdt_intent_layout(enum mdt_it_code opcode,
3167                              struct mdt_thread_info *info,
3168                              struct ldlm_lock **lockp,
3169                              __u64 flags)
3170 {
3171         struct layout_intent *layout;
3172         struct lu_fid *fid;
3173         struct mdt_object *obj = NULL;
3174         struct md_object *child = NULL;
3175         int rc;
3176         ENTRY;
3177
3178         if (opcode != MDT_IT_LAYOUT) {
3179                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3180                         opcode);
3181                 RETURN(-EINVAL);
3182         }
3183
3184         fid = &info->mti_tmp_fid2;
3185         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3186
3187         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3188         if (IS_ERR(obj))
3189                 RETURN(PTR_ERR(obj));
3190
3191         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3192                 child = mdt_object_child(obj);
3193
3194                 /* get the length of lsm */
3195                 rc = mo_xattr_get(info->mti_env, child, &LU_BUF_NULL,
3196                                   XATTR_NAME_LOV);
3197
3198                 if (rc > info->mti_mdt->mdt_max_mdsize)
3199                         info->mti_mdt->mdt_max_mdsize = rc;
3200         }
3201
3202         mdt_object_put(info->mti_env, obj);
3203
3204         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3205         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3206                         ldlm_lvbo_size(*lockp));
3207         rc = req_capsule_server_pack(info->mti_pill);
3208         if (rc != 0)
3209                 RETURN(-EINVAL);
3210
3211         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3212         LASSERT(layout != NULL);
3213         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3214                 /* return to normal ldlm handling */
3215                 RETURN(0);
3216
3217         CERROR("%s: Unsupported layout intent (%d)\n",
3218                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3219         RETURN(-EINVAL);
3220 }
3221
3222 static int mdt_intent_reint(enum mdt_it_code opcode,
3223                             struct mdt_thread_info *info,
3224                             struct ldlm_lock **lockp,
3225                             __u64 flags)
3226 {
3227         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3228         struct ldlm_reply      *rep = NULL;
3229         long                    opc;
3230         int                     rc;
3231
3232         static const struct req_format *intent_fmts[REINT_MAX] = {
3233                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3234                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3235         };
3236
3237         ENTRY;
3238
3239         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3240         if (opc < 0)
3241                 RETURN(opc);
3242
3243         if (mdt_it_flavor[opcode].it_reint != opc) {
3244                 CERROR("Reint code %ld doesn't match intent: %d\n",
3245                        opc, opcode);
3246                 RETURN(err_serious(-EPROTO));
3247         }
3248
3249         /* Get lock from request for possible resent case. */
3250         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3251
3252         rc = mdt_reint_internal(info, lhc, opc);
3253
3254         /* Check whether the reply has been packed successfully. */
3255         if (mdt_info_req(info)->rq_repmsg != NULL)
3256                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3257         if (rep == NULL)
3258                 RETURN(err_serious(-EFAULT));
3259
3260         /* MDC expects this in any case */
3261         if (rc != 0)
3262                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3263
3264         /* the open lock or the lock for cross-ref object should be
3265          * returned to the client */
3266         if (rc == -EREMOTE || mdt_get_disposition(rep, DISP_OPEN_LOCK)) {
3267                 LASSERT(lustre_handle_is_used(&lhc->mlh_reg_lh));
3268                 rep->lock_policy_res2 = 0;
3269                 rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3270                 RETURN(rc);
3271         }
3272
3273         rep->lock_policy_res2 = clear_serious(rc);
3274
3275         if (rep->lock_policy_res2 == -ENOENT &&
3276             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3277                 rep->lock_policy_res2 = 0;
3278
3279         if (rc == -ENOTCONN || rc == -ENODEV ||
3280             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3281                 /*
3282                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3283                  * will be returned by rq_status, and client at ptlrpc layer
3284                  * will detect this, then disconnect, reconnect the import
3285                  * immediately, instead of impacting the following the rpc.
3286                  */
3287                 lhc->mlh_reg_lh.cookie = 0ull;
3288                 RETURN(rc);
3289         } else {
3290                 /*
3291                  * For other cases, the error will be returned by intent.
3292                  * and client will retrieve the result from intent.
3293                  */
3294                  /*
3295                   * FIXME: when open lock is finished, that should be
3296                   * checked here.
3297                   */
3298                 if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3299                         LASSERTF(rc == 0, "Error occurred but lock handle "
3300                                  "is still in use, rc = %d\n", rc);
3301                         rep->lock_policy_res2 = 0;
3302                         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3303                         RETURN(rc);
3304                 } else {
3305                         lhc->mlh_reg_lh.cookie = 0ull;
3306                         RETURN(ELDLM_LOCK_ABORTED);
3307                 }
3308         }
3309 }
3310
3311 static int mdt_intent_code(long itcode)
3312 {
3313         int rc;
3314
3315         switch(itcode) {
3316         case IT_OPEN:
3317                 rc = MDT_IT_OPEN;
3318                 break;
3319         case IT_OPEN|IT_CREAT:
3320                 rc = MDT_IT_OCREAT;
3321                 break;
3322         case IT_CREAT:
3323                 rc = MDT_IT_CREATE;
3324                 break;
3325         case IT_READDIR:
3326                 rc = MDT_IT_READDIR;
3327                 break;
3328         case IT_GETATTR:
3329                 rc = MDT_IT_GETATTR;
3330                 break;
3331         case IT_LOOKUP:
3332                 rc = MDT_IT_LOOKUP;
3333                 break;
3334         case IT_UNLINK:
3335                 rc = MDT_IT_UNLINK;
3336                 break;
3337         case IT_TRUNC:
3338                 rc = MDT_IT_TRUNC;
3339                 break;
3340         case IT_GETXATTR:
3341                 rc = MDT_IT_GETXATTR;
3342                 break;
3343         case IT_LAYOUT:
3344                 rc = MDT_IT_LAYOUT;
3345                 break;
3346         case IT_QUOTA_DQACQ:
3347         case IT_QUOTA_CONN:
3348                 rc = MDT_IT_QUOTA;
3349                 break;
3350         default:
3351                 CERROR("Unknown intent opcode: %ld\n", itcode);
3352                 rc = -EINVAL;
3353                 break;
3354         }
3355         return rc;
3356 }
3357
3358 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3359                           struct ldlm_lock **lockp, __u64 flags)
3360 {
3361         struct req_capsule   *pill;
3362         struct mdt_it_flavor *flv;
3363         int opc;
3364         int rc;
3365         ENTRY;
3366
3367         opc = mdt_intent_code(itopc);
3368         if (opc < 0)
3369                 RETURN(-EINVAL);
3370
3371         pill = info->mti_pill;
3372
3373         if (opc == MDT_IT_QUOTA) {
3374                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3375
3376                 if (qmt == NULL)
3377                         RETURN(-EOPNOTSUPP);
3378
3379                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3380                 /* pass the request to quota master */
3381                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3382                                                  mdt_info_req(info), lockp,
3383                                                  flags);
3384                 RETURN(rc);
3385         }
3386
3387         flv  = &mdt_it_flavor[opc];
3388         if (flv->it_fmt != NULL)
3389                 req_capsule_extend(pill, flv->it_fmt);
3390
3391         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3392         if (rc == 0) {
3393                 struct ptlrpc_request *req = mdt_info_req(info);
3394                 if (flv->it_flags & MUTABOR &&
3395                     exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3396                         RETURN(-EROFS);
3397         }
3398         if (rc == 0 && flv->it_act != NULL) {
3399                 struct ldlm_reply *rep;
3400
3401                 /* execute policy */
3402                 rc = flv->it_act(opc, info, lockp, flags);
3403
3404                 /* Check whether the reply has been packed successfully. */
3405                 if (mdt_info_req(info)->rq_repmsg != NULL) {
3406                         rep = req_capsule_server_get(info->mti_pill,
3407                                                      &RMF_DLM_REP);
3408                         rep->lock_policy_res2 =
3409                                 ptlrpc_status_hton(rep->lock_policy_res2);
3410                 }
3411         } else {
3412                 rc = -EPROTO;
3413         }
3414         RETURN(rc);
3415 }
3416
3417 static int mdt_intent_policy(struct ldlm_namespace *ns,
3418                              struct ldlm_lock **lockp, void *req_cookie,
3419                              ldlm_mode_t mode, __u64 flags, void *data)
3420 {
3421         struct tgt_session_info *tsi;
3422         struct mdt_thread_info  *info;
3423         struct ptlrpc_request   *req  =  req_cookie;
3424         struct ldlm_intent      *it;
3425         struct req_capsule      *pill;
3426         int rc;
3427
3428         ENTRY;
3429
3430         LASSERT(req != NULL);
3431
3432         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3433
3434         info = tsi2mdt_info(tsi);
3435         LASSERT(info != NULL);
3436         pill = info->mti_pill;
3437         LASSERT(pill->rc_req == req);
3438
3439         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3440                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3441                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3442                 if (it != NULL) {
3443                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3444                         if (rc == 0)
3445                                 rc = ELDLM_OK;
3446
3447                         /* Lock without inodebits makes no sense and will oops
3448                          * later in ldlm. Let's check it now to see if we have
3449                          * ibits corrupted somewhere in mdt_intent_opc().
3450                          * The case for client miss to set ibits has been
3451                          * processed by others. */
3452                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3453                                         lr_type == LDLM_IBITS,
3454                                      info->mti_dlm_req->lock_desc.\
3455                                         l_policy_data.l_inodebits.bits != 0));
3456                 } else
3457                         rc = err_serious(-EFAULT);
3458         } else {
3459                 /* No intent was provided */
3460                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3461                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3462                 rc = req_capsule_server_pack(pill);
3463                 if (rc)
3464                         rc = err_serious(rc);
3465         }
3466         mdt_thread_info_fini(info);
3467         RETURN(rc);
3468 }
3469
3470 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3471 {
3472         struct seq_server_site  *ss = mdt_seq_site(mdt);
3473
3474         if (ss->ss_node_id == 0)
3475                 return;
3476
3477         if (ss->ss_client_seq != NULL) {
3478                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3479                 ss->ss_client_seq->lcs_exp = NULL;
3480         }
3481
3482         if (ss->ss_server_fld != NULL) {
3483                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3484                 ss->ss_server_fld->lsf_control_exp = NULL;
3485         }
3486 }
3487
3488 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3489 {
3490         struct seq_server_site *ss = mdt_seq_site(mdt);
3491
3492         if (ss == NULL)
3493                 return;
3494
3495         if (ss->ss_server_seq == NULL)
3496                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3497
3498         return;
3499 }
3500
3501 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3502 {
3503         mdt_seq_fini_cli(mdt);
3504         mdt_deregister_seq_exp(mdt);
3505
3506         return seq_site_fini(env, mdt_seq_site(mdt));
3507 }
3508
3509 /**
3510  * It will retrieve its FLDB entries from MDT0, and it only happens
3511  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3512  * and it needs to refresh FLDB from the MDT0.
3513  **/
3514 static int mdt_register_lwp_callback(void *data)
3515 {
3516         struct lu_env           env;
3517         struct mdt_device       *mdt = data;
3518         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3519         int                     rc;
3520         ENTRY;
3521
3522         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3523
3524         if (!likely(fld->lsf_new))
3525                 RETURN(0);
3526
3527         rc = lu_env_init(&env, LCT_MD_THREAD);
3528         if (rc) {
3529                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3530                 RETURN(rc);
3531         }
3532
3533         rc = fld_update_from_controller(&env, fld);
3534         if (rc != 0) {
3535                 CERROR("%s: cannot update controller: rc = %d\n",
3536                        mdt_obd_name(mdt), rc);
3537                 GOTO(out, rc);
3538         }
3539 out:
3540         lu_env_fini(&env);
3541         RETURN(rc);
3542 }
3543
3544 static int mdt_register_seq_exp(struct mdt_device *mdt)
3545 {
3546         struct seq_server_site  *ss = mdt_seq_site(mdt);
3547         char                    *lwp_name = NULL;
3548         int                     rc;
3549
3550         if (ss->ss_node_id == 0)
3551                 return 0;
3552
3553         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3554         if (lwp_name == NULL)
3555                 GOTO(out_free, rc = -ENOMEM);
3556
3557         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3558         if (rc != 0)
3559                 GOTO(out_free, rc);
3560
3561         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3562                                       NULL, NULL);
3563         if (rc != 0)
3564                 GOTO(out_free, rc);
3565
3566         rc = lustre_register_lwp_item(lwp_name,
3567                                       &ss->ss_server_fld->lsf_control_exp,
3568                                       mdt_register_lwp_callback, mdt);
3569         if (rc != 0) {
3570                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3571                 ss->ss_client_seq->lcs_exp = NULL;
3572                 GOTO(out_free, rc);
3573         }
3574 out_free:
3575         if (lwp_name != NULL)
3576                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3577
3578         return rc;
3579 }
3580
3581 /*
3582  * Init client sequence manager which is used by local MDS to talk to sequence
3583  * controller on remote node.
3584  */
3585 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3586 {
3587         struct seq_server_site  *ss = mdt_seq_site(mdt);
3588         int                     rc;
3589         char                    *prefix;
3590         ENTRY;
3591
3592         /* check if this is adding the first MDC and controller is not yet
3593          * initialized. */
3594         OBD_ALLOC_PTR(ss->ss_client_seq);
3595         if (ss->ss_client_seq == NULL)
3596                 RETURN(-ENOMEM);
3597
3598         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3599         if (prefix == NULL) {
3600                 OBD_FREE_PTR(ss->ss_client_seq);
3601                 ss->ss_client_seq = NULL;
3602                 RETURN(-ENOMEM);
3603         }
3604
3605         /* Note: seq_client_fini will be called in seq_site_fini */
3606         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3607         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3608                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3609                                                             NULL);
3610         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3611         if (rc != 0) {
3612                 OBD_FREE_PTR(ss->ss_client_seq);
3613                 ss->ss_client_seq = NULL;
3614                 RETURN(rc);
3615         }
3616
3617         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3618
3619         RETURN(rc);
3620 }
3621
3622 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3623 {
3624         struct seq_server_site  *ss;
3625         int                     rc;
3626         ENTRY;
3627
3628         ss = mdt_seq_site(mdt);
3629         /* init sequence controller server(MDT0) */
3630         if (ss->ss_node_id == 0) {
3631                 OBD_ALLOC_PTR(ss->ss_control_seq);
3632                 if (ss->ss_control_seq == NULL)
3633                         RETURN(-ENOMEM);
3634
3635                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3636                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3637                                      ss);
3638                 if (rc)
3639                         GOTO(out_seq_fini, rc);
3640         }
3641
3642         /* Init normal sequence server */
3643         OBD_ALLOC_PTR(ss->ss_server_seq);
3644         if (ss->ss_server_seq == NULL)
3645                 GOTO(out_seq_fini, rc = -ENOMEM);
3646
3647         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3648                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3649         if (rc)
3650                 GOTO(out_seq_fini, rc);
3651
3652         /* init seq client for seq server to talk to seq controller(MDT0) */
3653         rc = mdt_seq_init_cli(env, mdt);
3654         if (rc != 0)
3655                 GOTO(out_seq_fini, rc);
3656
3657         if (ss->ss_node_id != 0)
3658                 /* register controler export through lwp */
3659                 rc = mdt_register_seq_exp(mdt);
3660
3661         EXIT;
3662 out_seq_fini:
3663         if (rc)
3664                 mdt_seq_fini(env, mdt);
3665
3666         return rc;
3667 }
3668
3669 /*
3670  * FLD wrappers
3671  */
3672 static int mdt_fld_fini(const struct lu_env *env,
3673                         struct mdt_device *m)
3674 {
3675         struct seq_server_site *ss = mdt_seq_site(m);
3676         ENTRY;
3677
3678         if (ss && ss->ss_server_fld) {
3679                 fld_server_fini(env, ss->ss_server_fld);
3680                 OBD_FREE_PTR(ss->ss_server_fld);
3681                 ss->ss_server_fld = NULL;
3682         }
3683
3684         RETURN(0);
3685 }
3686
3687 static int mdt_fld_init(const struct lu_env *env,
3688                         const char *uuid,
3689                         struct mdt_device *m)
3690 {
3691         struct seq_server_site *ss;
3692         int rc;
3693         ENTRY;
3694
3695         ss = mdt_seq_site(m);
3696
3697         OBD_ALLOC_PTR(ss->ss_server_fld);
3698         if (ss->ss_server_fld == NULL)
3699                 RETURN(rc = -ENOMEM);
3700
3701         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3702                              LU_SEQ_RANGE_MDT);
3703         if (rc) {
3704                 OBD_FREE_PTR(ss->ss_server_fld);
3705                 ss->ss_server_fld = NULL;
3706                 RETURN(rc);
3707         }
3708
3709         RETURN(0);
3710 }
3711
3712 static void mdt_stack_pre_fini(const struct lu_env *env,
3713                            struct mdt_device *m, struct lu_device *top)
3714 {
3715         struct obd_device       *obd;
3716         struct lustre_cfg_bufs  *bufs;
3717         struct lustre_cfg       *lcfg;
3718         struct mdt_thread_info  *info;
3719         ENTRY;
3720
3721         LASSERT(top);
3722
3723         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3724         LASSERT(info != NULL);
3725
3726         bufs = &info->mti_u.bufs;
3727
3728         LASSERT(m->mdt_child_exp);
3729         LASSERT(m->mdt_child_exp->exp_obd);
3730         obd = m->mdt_child_exp->exp_obd;
3731
3732         /* process cleanup, pass mdt obd name to get obd umount flags */
3733         /* XXX: this is needed because all layers are referenced by
3734          * objects (some of them are pinned by osd, for example *
3735          * the proper solution should be a model where object used
3736          * by osd only doesn't have mdt/mdd slices -bzzz */
3737         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3738         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3739         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3740         if (!lcfg) {
3741                 CERROR("%s:Cannot alloc lcfg!\n", mdt_obd_name(m));
3742                 return;
3743         }
3744         top->ld_ops->ldo_process_config(env, top, lcfg);
3745         lustre_cfg_free(lcfg);
3746         EXIT;
3747 }
3748
3749 static void mdt_stack_fini(const struct lu_env *env,
3750                            struct mdt_device *m, struct lu_device *top)
3751 {
3752         struct obd_device       *obd = mdt2obd_dev(m);
3753         struct lustre_cfg_bufs  *bufs;
3754         struct lustre_cfg       *lcfg;
3755         struct mdt_thread_info  *info;
3756         char                     flags[3] = "";
3757         ENTRY;
3758
3759         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3760         LASSERT(info != NULL);
3761
3762         lu_dev_del_linkage(top->ld_site, top);
3763
3764         lu_site_purge(env, top->ld_site, -1);
3765
3766         bufs = &info->mti_u.bufs;
3767         /* process cleanup, pass mdt obd name to get obd umount flags */
3768         /* another purpose is to let all layers to release their objects */
3769         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3770         if (obd->obd_force)
3771                 strcat(flags, "F");
3772         if (obd->obd_fail)
3773                 strcat(flags, "A");
3774         lustre_cfg_bufs_set_string(bufs, 1, flags);
3775         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3776         if (!lcfg) {
3777                 CERROR("Cannot alloc lcfg!\n");
3778                 return;
3779         }
3780         LASSERT(top);
3781         top->ld_ops->ldo_process_config(env, top, lcfg);
3782         lustre_cfg_free(lcfg);
3783
3784         lu_site_purge(env, top->ld_site, -1);
3785
3786         m->mdt_child = NULL;
3787         m->mdt_bottom = NULL;
3788
3789         obd_disconnect(m->mdt_child_exp);
3790         m->mdt_child_exp = NULL;
3791
3792         obd_disconnect(m->mdt_bottom_exp);
3793         m->mdt_child_exp = NULL;
3794 }
3795
3796 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3797                                const char *next, struct obd_export **exp)
3798 {
3799         struct obd_connect_data *data = NULL;
3800         struct obd_device       *obd;
3801         int                      rc;
3802         ENTRY;
3803
3804         OBD_ALLOC_PTR(data);
3805         if (data == NULL)
3806                 GOTO(out, rc = -ENOMEM);
3807
3808         obd = class_name2obd(next);
3809         if (obd == NULL) {
3810                 CERROR("%s: can't locate next device: %s\n",
3811                        mdt_obd_name(m), next);
3812                 GOTO(out, rc = -ENOTCONN);
3813         }
3814
3815         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3816         data->ocd_version = LUSTRE_VERSION_CODE;
3817
3818         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3819         if (rc) {
3820                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3821                        mdt_obd_name(m), next, rc);
3822                 GOTO(out, rc);
3823         }
3824
3825 out:
3826         if (data)
3827                 OBD_FREE_PTR(data);
3828         RETURN(rc);
3829 }
3830
3831 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3832                           struct lustre_cfg *cfg)
3833 {
3834         char                   *dev = lustre_cfg_string(cfg, 0);
3835         int                     rc, name_size, uuid_size;
3836         char                   *name, *uuid, *p;
3837         struct lustre_cfg_bufs *bufs;
3838         struct lustre_cfg      *lcfg;
3839         struct obd_device      *obd;
3840         struct lustre_profile  *lprof;
3841         struct lu_site         *site;
3842         ENTRY;
3843
3844         /* in 1.8 we had the only device in the stack - MDS.
3845          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3846          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3847          * to generate names and setup MDT, MDD. MDT will be using
3848          * generated name to connect to MDD. for MDD the next device
3849          * will be LOD with name taken from so called "profile" which
3850          * is generated by mount_option line
3851          *
3852          * 1.8 MGS generates config. commands like this:
3853          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3854          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3855          * 2.0 MGS generates config. commands like this:
3856          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3857          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3858          *                    3:lustre-MDT0000-mdtlov  4:f
3859          *
3860          * we generate MDD name from MDT one, just replacing T with D
3861          *
3862          * after all the preparations, the logical equivalent will be
3863          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3864          *                    3:lustre-MDT0000-mdtlov  4:f
3865          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3866          *                    3:lustre-MDD0000  4:f
3867          *
3868          *  notice we build the stack from down to top: MDD first, then MDT */
3869
3870         name_size = MAX_OBD_NAME;
3871         uuid_size = MAX_OBD_NAME;
3872
3873         OBD_ALLOC(name, name_size);
3874         OBD_ALLOC(uuid, uuid_size);
3875         if (name == NULL || uuid == NULL)
3876                 GOTO(cleanup_mem, rc = -ENOMEM);
3877
3878         OBD_ALLOC_PTR(bufs);
3879         if (!bufs)
3880                 GOTO(cleanup_mem, rc = -ENOMEM);
3881
3882         strcpy(name, dev);
3883         p = strstr(name, "-MDT");
3884         if (p == NULL)
3885                 GOTO(free_bufs, rc = -ENOMEM);
3886         p[3] = 'D';
3887
3888         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3889
3890         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3891         if (lprof == NULL || lprof->lp_dt == NULL) {
3892                 CERROR("can't find the profile: %s\n",
3893                        lustre_cfg_string(cfg, 0));
3894                 GOTO(free_bufs, rc = -EINVAL);
3895         }
3896
3897         lustre_cfg_bufs_reset(bufs, name);
3898         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
3899         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3900         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3901
3902         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3903         if (!lcfg)
3904                 GOTO(free_bufs, rc = -ENOMEM);
3905
3906         rc = class_attach(lcfg);
3907         if (rc)
3908                 GOTO(lcfg_cleanup, rc);
3909
3910         obd = class_name2obd(name);
3911         if (!obd) {
3912                 CERROR("Can not find obd %s (%s in config)\n",
3913                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
3914                 GOTO(class_detach, rc = -EINVAL);
3915         }
3916
3917         lustre_cfg_free(lcfg);
3918
3919         lustre_cfg_bufs_reset(bufs, name);
3920         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3921         lustre_cfg_bufs_set_string(bufs, 2, dev);
3922         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3923
3924         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3925
3926         rc = class_setup(obd, lcfg);
3927         if (rc)
3928                 GOTO(class_detach, rc);
3929
3930         /* connect to MDD we just setup */
3931         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
3932         if (rc)
3933                 GOTO(class_detach, rc);
3934
3935         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
3936         LASSERT(site);
3937         LASSERT(mdt_lu_site(mdt) == NULL);
3938         mdt->mdt_lu_dev.ld_site = site;
3939         site->ls_top_dev = &mdt->mdt_lu_dev;
3940         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
3941
3942         /* now connect to bottom OSD */
3943         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
3944         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
3945         if (rc)
3946                 GOTO(class_detach, rc);
3947         mdt->mdt_bottom =
3948                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
3949
3950         rc = lu_env_refill((struct lu_env *)env);
3951         if (rc != 0)
3952                 CERROR("Failure to refill session: '%d'\n", rc);
3953
3954         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
3955
3956         EXIT;
3957 class_detach:
3958         if (rc)
3959                 class_detach(obd, lcfg);
3960 lcfg_cleanup:
3961         lustre_cfg_free(lcfg);
3962 free_bufs:
3963         OBD_FREE_PTR(bufs);
3964 cleanup_mem:
3965         if (name)
3966                 OBD_FREE(name, name_size);
3967         if (uuid)
3968                 OBD_FREE(uuid, uuid_size);
3969         RETURN(rc);
3970 }
3971
3972 /* setup quota master target on MDT0 */
3973 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
3974                           struct lustre_cfg *cfg)
3975 {
3976         struct obd_device       *obd;
3977         char                    *dev = lustre_cfg_string(cfg, 0);
3978         char                    *qmtname, *uuid, *p;
3979         struct lustre_cfg_bufs  *bufs;
3980         struct lustre_cfg       *lcfg;
3981         struct lustre_profile   *lprof;
3982         struct obd_connect_data *data;
3983         int                      rc;
3984         ENTRY;
3985
3986         LASSERT(mdt->mdt_qmt_exp == NULL);
3987         LASSERT(mdt->mdt_qmt_dev == NULL);
3988
3989         /* quota master is on MDT0 only for now */
3990         if (mdt->mdt_seq_site.ss_node_id != 0)
3991                 RETURN(0);
3992
3993         /* MGS generates config commands which look as follows:
3994          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3995          *                    3:lustre-MDT0000-mdtlov  4:f
3996          *
3997          * We generate the QMT name from the MDT one, just replacing MD with QM
3998          * after all the preparations, the logical equivalent will be:
3999          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4000          *                    3:lustre-MDT0000-osd  4:f */
4001         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4002         OBD_ALLOC(uuid, UUID_MAX);
4003         OBD_ALLOC_PTR(bufs);
4004         OBD_ALLOC_PTR(data);
4005         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4006                 GOTO(cleanup_mem, rc = -ENOMEM);
4007
4008         strcpy(qmtname, dev);
4009         p = strstr(qmtname, "-MDT");
4010         if (p == NULL)
4011                 GOTO(cleanup_mem, rc = -ENOMEM);
4012         /* replace MD with QM */
4013         p[1] = 'Q';
4014         p[2] = 'M';
4015
4016         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4017
4018         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4019         if (lprof == NULL || lprof->lp_dt == NULL) {
4020                 CERROR("can't find profile for %s\n",
4021                        lustre_cfg_string(cfg, 0));
4022                 GOTO(cleanup_mem, rc = -EINVAL);
4023         }
4024
4025         lustre_cfg_bufs_reset(bufs, qmtname);
4026         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4027         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4028         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4029
4030         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4031         if (!lcfg)
4032                 GOTO(cleanup_mem, rc = -ENOMEM);
4033
4034         rc = class_attach(lcfg);
4035         if (rc)
4036                 GOTO(lcfg_cleanup, rc);
4037
4038         obd = class_name2obd(qmtname);
4039         if (!obd) {
4040                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4041                        lustre_cfg_string(cfg, 0));
4042                 GOTO(class_detach, rc = -EINVAL);
4043         }
4044
4045         lustre_cfg_free(lcfg);
4046
4047         lustre_cfg_bufs_reset(bufs, qmtname);
4048         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4049         lustre_cfg_bufs_set_string(bufs, 2, dev);
4050
4051         /* for quota, the next device should be the OSD device */
4052         lustre_cfg_bufs_set_string(bufs, 3,
4053                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4054
4055         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4056
4057         rc = class_setup(obd, lcfg);
4058         if (rc)
4059                 GOTO(class_detach, rc);
4060
4061         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4062
4063         /* configure local quota objects */
4064         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4065                                                    &mdt->mdt_lu_dev,
4066                                                    mdt->mdt_qmt_dev);
4067         if (rc)
4068                 GOTO(class_cleanup, rc);
4069
4070         /* connect to quota master target */
4071         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4072         data->ocd_version = LUSTRE_VERSION_CODE;
4073         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4074                          data, NULL);
4075         if (rc) {
4076                 CERROR("cannot connect to quota master device %s (%d)\n",
4077                        qmtname, rc);
4078                 GOTO(class_cleanup, rc);
4079         }
4080
4081         EXIT;
4082 class_cleanup:
4083         if (rc) {
4084                 class_manual_cleanup(obd);
4085                 mdt->mdt_qmt_dev = NULL;
4086         }
4087 class_detach:
4088         if (rc)
4089                 class_detach(obd, lcfg);
4090 lcfg_cleanup:
4091         lustre_cfg_free(lcfg);
4092 cleanup_mem:
4093         if (bufs)
4094                 OBD_FREE_PTR(bufs);
4095         if (qmtname)
4096                 OBD_FREE(qmtname, MAX_OBD_NAME);
4097         if (uuid)
4098                 OBD_FREE(uuid, UUID_MAX);
4099         if (data)
4100                 OBD_FREE_PTR(data);
4101         return rc;
4102 }
4103
4104 /* Shutdown quota master target associated with mdt */
4105 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4106 {
4107         ENTRY;
4108
4109         if (mdt->mdt_qmt_exp == NULL)
4110                 RETURN_EXIT;
4111         LASSERT(mdt->mdt_qmt_dev != NULL);
4112
4113         /* the qmt automatically shuts down when the mdt disconnects */
4114         obd_disconnect(mdt->mdt_qmt_exp);
4115         mdt->mdt_qmt_exp = NULL;
4116         mdt->mdt_qmt_dev = NULL;
4117         EXIT;
4118 }
4119
4120 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4121  * for now. This will be removed along with converting rest of MDT code
4122  * to use tgt_session_info */
4123 int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4124 {
4125         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4126         int                      rc;
4127
4128         rc = mdt_getxattr(info);
4129
4130         mdt_thread_info_fini(info);
4131         return rc;
4132 }
4133
4134 static struct tgt_handler mdt_tgt_handlers[] = {
4135 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4136                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4137                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4138 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4139                 0,                      MDS_DISCONNECT, tgt_disconnect,
4140                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4141 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4142                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4143                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4144 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4145 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
4146 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4147 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4148                                                         mdt_getattr_name),
4149 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4150 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4151 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4152 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4153 TGT_MDT_HDL(HABEO_CORPUS,               MDS_DONE_WRITING,
4154                                                         mdt_done_writing),
4155 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4156 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4157 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_IS_SUBDIR,  mdt_is_subdir),
4158 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4159 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4160                                                         mdt_hsm_progress),
4161 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4162                                                         mdt_hsm_ct_register),
4163 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4164                                                         mdt_hsm_ct_unregister),
4165 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4166                                                         mdt_hsm_state_get),
4167 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4168                                                         mdt_hsm_state_set),
4169 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4170 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4171                                                         mdt_hsm_request),
4172 TGT_MDT_HDL(HABEO_CORPUS|HABEO_REFERO | MUTABOR, MDS_SWAP_LAYOUTS,
4173                                                         mdt_swap_layouts)
4174 };
4175
4176 static struct tgt_handler mdt_sec_ctx_ops[] = {
4177 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4178 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4179 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4180 };
4181
4182 static struct tgt_handler mdt_quota_ops[] = {
4183 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4184 };
4185
4186 static struct tgt_opc_slice mdt_common_slice[] = {
4187         {
4188                 .tos_opc_start  = MDS_FIRST_OPC,
4189                 .tos_opc_end    = MDS_LAST_OPC,
4190                 .tos_hs         = mdt_tgt_handlers
4191         },
4192         {
4193                 .tos_opc_start  = OBD_FIRST_OPC,
4194                 .tos_opc_end    = OBD_LAST_OPC,
4195                 .tos_hs         = tgt_obd_handlers
4196         },
4197         {
4198                 .tos_opc_start  = LDLM_FIRST_OPC,
4199                 .tos_opc_end    = LDLM_LAST_OPC,
4200                 .tos_hs         = tgt_dlm_handlers
4201         },
4202         {
4203                 .tos_opc_start  = SEC_FIRST_OPC,
4204                 .tos_opc_end    = SEC_LAST_OPC,
4205                 .tos_hs         = mdt_sec_ctx_ops
4206         },
4207         {
4208                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4209                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4210                 .tos_hs         = tgt_out_handlers
4211         },
4212         {
4213                 .tos_opc_start  = FLD_FIRST_OPC,
4214                 .tos_opc_end    = FLD_LAST_OPC,
4215                 .tos_hs         = fld_handlers
4216         },
4217         {
4218                 .tos_opc_start  = SEQ_FIRST_OPC,
4219                 .tos_opc_end    = SEQ_LAST_OPC,
4220                 .tos_hs         = seq_handlers
4221         },
4222         {
4223                 .tos_opc_start  = QUOTA_DQACQ,
4224                 .tos_opc_end    = QUOTA_LAST_OPC,
4225                 .tos_hs         = mdt_quota_ops
4226         },
4227         {
4228                 .tos_opc_start  = LLOG_FIRST_OPC,
4229                 .tos_opc_end    = LLOG_LAST_OPC,
4230                 .tos_hs         = tgt_llog_handlers
4231         },
4232         {
4233                 .tos_opc_start  = LFSCK_FIRST_OPC,
4234                 .tos_opc_end    = LFSCK_LAST_OPC,
4235                 .tos_hs         = tgt_lfsck_handlers
4236         },
4237
4238         {
4239                 .tos_hs         = NULL
4240         }
4241 };
4242
4243 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4244 {
4245         struct md_device        *next = m->mdt_child;
4246         struct lu_device        *d    = &m->mdt_lu_dev;
4247         struct obd_device       *obd  = mdt2obd_dev(m);
4248         struct lfsck_stop        stop;
4249         ENTRY;
4250
4251         target_recovery_fini(obd);
4252         ping_evictor_stop();
4253         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4254
4255         if (m->mdt_opts.mo_coordinator)
4256                 mdt_hsm_cdt_stop(m);
4257
4258         mdt_hsm_cdt_fini(m);
4259
4260         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4261         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4262         obd_exports_barrier(obd);
4263         obd_zombie_barrier();
4264
4265         mdt_procfs_fini(m);
4266
4267         tgt_fini(env, &m->mdt_lut);
4268         mdt_fs_cleanup(env, m);
4269         upcall_cache_cleanup(m->mdt_identity_cache);
4270         m->mdt_identity_cache = NULL;
4271
4272         if (m->mdt_namespace != NULL) {
4273                 ldlm_namespace_free(m->mdt_namespace, NULL,
4274                                     d->ld_obd->obd_force);
4275                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4276         }
4277
4278         mdt_quota_fini(env, m);
4279
4280         cfs_free_nidlist(&m->mdt_nosquash_nids);
4281         if (m->mdt_nosquash_str) {
4282                 OBD_FREE(m->mdt_nosquash_str, m->mdt_nosquash_strlen);
4283                 m->mdt_nosquash_str = NULL;
4284                 m->mdt_nosquash_strlen = 0;
4285         }
4286
4287         stop.ls_status = LS_PAUSED;
4288         stop.ls_flags = 0;
4289         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4290
4291         mdt_seq_fini(env, m);
4292         mdt_fld_fini(env, m);
4293
4294         next->md_ops->mdo_init_capa_ctxt(env, next, 0, 0, 0, NULL);
4295         cfs_timer_disarm(&m->mdt_ck_timer);
4296         mdt_ck_thread_stop(m);
4297
4298         /*
4299          * Finish the stack
4300          */
4301         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4302
4303         LASSERT(atomic_read(&d->ld_ref) == 0);
4304
4305         server_put_mount(mdt_obd_name(m));
4306
4307         EXIT;
4308 }
4309
4310 int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4311
4312 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4313                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4314 {
4315         struct mdt_thread_info    *info;
4316         struct obd_device         *obd;
4317         const char                *dev = lustre_cfg_string(cfg, 0);
4318         const char                *num = lustre_cfg_string(cfg, 2);
4319         struct lustre_mount_info  *lmi = NULL;
4320         struct lustre_sb_info     *lsi;
4321         struct lu_site            *s;
4322         struct seq_server_site    *ss_site;
4323         const char                *identity_upcall = "NONE";
4324         struct md_device          *next;
4325         int                        rc;
4326         long                       node_id;
4327         mntopt_t                   mntopts;
4328         ENTRY;
4329
4330         lu_device_init(&m->mdt_lu_dev, ldt);
4331         /*
4332          * Environment (env) might be missing mdt_thread_key values at that
4333          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4334          * mode.
4335          *
4336          * Usually device allocation path doesn't use module key values, but
4337          * mdt has to do a lot of work here, so allocate key value.
4338          */
4339         rc = lu_env_refill((struct lu_env *)env);
4340         if (rc != 0)
4341                 RETURN(rc);
4342
4343         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4344         LASSERT(info != NULL);
4345
4346         obd = class_name2obd(dev);
4347         LASSERT(obd != NULL);
4348
4349         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4350
4351         m->mdt_som_conf = 0;
4352
4353         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4354
4355         /* default is coordinator off, it is started through conf_param
4356          * or /proc */
4357         m->mdt_opts.mo_coordinator = 0;
4358
4359         lmi = server_get_mount(dev);
4360         if (lmi == NULL) {
4361                 CERROR("Cannot get mount info for %s!\n", dev);
4362                 RETURN(-EFAULT);
4363         } else {
4364                 lsi = s2lsi(lmi->lmi_sb);
4365                 /* CMD is supported only in IAM mode */
4366                 LASSERT(num);
4367                 node_id = simple_strtol(num, NULL, 10);
4368                 obd->u.obt.obt_magic = OBT_MAGIC;
4369         }
4370
4371         spin_lock_init(&m->mdt_ioepoch_lock);
4372         m->mdt_capa_timeout = CAPA_TIMEOUT;
4373         m->mdt_capa_alg = CAPA_HMAC_ALG_SHA1;
4374         m->mdt_ck_timeout = CAPA_KEY_TIMEOUT;
4375         m->mdt_squash_uid = 0;
4376         m->mdt_squash_gid = 0;
4377         CFS_INIT_LIST_HEAD(&m->mdt_nosquash_nids);
4378         m->mdt_nosquash_str = NULL;
4379         m->mdt_nosquash_strlen = 0;
4380         init_rwsem(&m->mdt_squash_sem);
4381         spin_lock_init(&m->mdt_osfs_lock);
4382         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4383         m->mdt_enable_remote_dir = 0;
4384         m->mdt_enable_remote_dir_gid = 0;
4385
4386         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4387         m->mdt_lu_dev.ld_obd = obd;
4388         /* Set this lu_device to obd for error handling purposes. */
4389         obd->obd_lu_dev = &m->mdt_lu_dev;
4390
4391         /* init the stack */
4392         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4393         if (rc) {
4394                 CERROR("%s: Can't init device stack, rc %d\n",
4395                        mdt_obd_name(m), rc);
4396                 GOTO(err_lmi, rc);
4397         }
4398
4399         s = mdt_lu_site(m);
4400         ss_site = mdt_seq_site(m);
4401         s->ld_seq_site = ss_site;
4402         ss_site->ss_lu = s;
4403
4404         /* set server index */
4405         ss_site->ss_node_id = node_id;
4406
4407         /* failover is the default
4408          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4409          * assumed whose ss_node_id == 0 XXX
4410          * */
4411         obd->obd_replayable = 1;
4412         /* No connection accepted until configurations will finish */
4413         obd->obd_no_conn = 1;
4414
4415         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4416                 char *str = lustre_cfg_string(cfg, 4);
4417                 if (strchr(str, 'n')) {
4418                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4419                         obd->obd_replayable = 0;
4420                 }
4421         }
4422
4423         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4424         if (rc)
4425                 GOTO(err_fini_stack, rc);
4426
4427         rc = mdt_seq_init(env, m);
4428         if (rc)
4429                 GOTO(err_fini_fld, rc);
4430
4431         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4432                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4433         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4434                                               LDLM_NAMESPACE_SERVER,
4435                                               LDLM_NAMESPACE_GREEDY,
4436                                               LDLM_NS_TYPE_MDT);
4437         if (m->mdt_namespace == NULL)
4438                 GOTO(err_fini_seq, rc = -ENOMEM);
4439
4440         m->mdt_namespace->ns_lvbp = m;
4441         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4442
4443         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4444         /* set obd_namespace for compatibility with old code */
4445         obd->obd_namespace = m->mdt_namespace;
4446
4447         cfs_timer_init(&m->mdt_ck_timer, mdt_ck_timer_callback, m);
4448
4449         rc = mdt_hsm_cdt_init(m);
4450         if (rc != 0) {
4451                 CERROR("%s: error initializing coordinator, rc %d\n",
4452                        mdt_obd_name(m), rc);
4453                 GOTO(err_free_ns, rc);
4454         }
4455
4456         rc = mdt_ck_thread_start(m);
4457         if (rc)
4458                 GOTO(err_free_hsm, rc);
4459
4460         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4461                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4462                       OBD_FAIL_MDS_ALL_REPLY_NET);
4463         if (rc)
4464                 GOTO(err_capa, rc);
4465
4466         rc = mdt_fs_setup(env, m, obd, lsi);
4467         if (rc)
4468                 GOTO(err_tgt, rc);
4469
4470         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4471
4472         next = m->mdt_child;
4473         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4474                                          &mntopts);
4475         if (rc)
4476                 GOTO(err_fs_cleanup, rc);
4477
4478         if (mntopts & MNTOPT_USERXATTR)
4479                 m->mdt_opts.mo_user_xattr = 1;
4480         else
4481                 m->mdt_opts.mo_user_xattr = 0;
4482
4483         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4484         if (rc)
4485                 GOTO(err_fs_cleanup, rc);
4486
4487         if (mntopts & MNTOPT_ACL)
4488                 m->mdt_opts.mo_acl = 1;
4489         else
4490                 m->mdt_opts.mo_acl = 0;
4491
4492         /* XXX: to support suppgid for ACL, we enable identity_upcall
4493          * by default, otherwise, maybe got unexpected -EACCESS. */
4494         if (m->mdt_opts.mo_acl)
4495                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4496
4497         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4498                                                 identity_upcall,
4499                                                 &mdt_identity_upcall_cache_ops);
4500         if (IS_ERR(m->mdt_identity_cache)) {
4501                 rc = PTR_ERR(m->mdt_identity_cache);
4502                 m->mdt_identity_cache = NULL;
4503                 GOTO(err_fs_cleanup, rc);
4504         }
4505
4506         rc = mdt_procfs_init(m, dev);
4507         if (rc) {
4508                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4509                 GOTO(err_recovery, rc);
4510         }
4511
4512         rc = mdt_quota_init(env, m, cfg);
4513         if (rc)
4514                 GOTO(err_procfs, rc);
4515
4516         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4517         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4518                            "mdt_ldlm_client", m->mdt_ldlm_client);
4519
4520         ping_evictor_start();
4521
4522         /* recovery will be started upon mdt_prepare()
4523          * when the whole stack is complete and ready
4524          * to serve the requests */
4525
4526         mdt_init_capa_ctxt(env, m);
4527
4528         /* Reduce the initial timeout on an MDS because it doesn't need such
4529          * a long timeout as an OST does. Adaptive timeouts will adjust this
4530          * value appropriately. */
4531         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4532                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4533
4534         RETURN(0);
4535 err_procfs:
4536         mdt_procfs_fini(m);
4537 err_recovery:
4538         target_recovery_fini(obd);
4539         upcall_cache_cleanup(m->mdt_identity_cache);
4540         m->mdt_identity_cache = NULL;
4541 err_fs_cleanup:
4542         mdt_fs_cleanup(env, m);
4543 err_tgt:
4544         tgt_fini(env, &m->mdt_lut);
4545 err_capa:
4546         cfs_timer_disarm(&m->mdt_ck_timer);
4547         mdt_ck_thread_stop(m);
4548 err_free_hsm:
4549         mdt_hsm_cdt_fini(m);
4550 err_free_ns:
4551         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4552         obd->obd_namespace = m->mdt_namespace = NULL;
4553 err_fini_seq:
4554         mdt_seq_fini(env, m);
4555 err_fini_fld:
4556         mdt_fld_fini(env, m);
4557 err_fini_stack:
4558         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4559 err_lmi:
4560         if (lmi)
4561                 server_put_mount(dev);
4562         return(rc);
4563 }
4564
4565 /* For interoperability, the left element is old parameter, the right one
4566  * is the new version of the parameter, if some parameter is deprecated,
4567  * the new version should be set as NULL. */
4568 static struct cfg_interop_param mdt_interop_param[] = {
4569         { "mdt.group_upcall",   NULL },
4570         { "mdt.quota_type",     NULL },
4571         { "mdd.quota_type",     NULL },
4572         { "mdt.rootsquash",     "mdt.root_squash" },
4573         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4574         { NULL }
4575 };
4576
4577 /* used by MGS to process specific configurations */
4578 static int mdt_process_config(const struct lu_env *env,
4579                               struct lu_device *d, struct lustre_cfg *cfg)
4580 {
4581         struct mdt_device *m = mdt_dev(d);
4582         struct md_device *md_next = m->mdt_child;
4583         struct lu_device *next = md2lu_dev(md_next);
4584         int rc;
4585         ENTRY;
4586
4587         switch (cfg->lcfg_command) {
4588         case LCFG_PARAM: {
4589                 struct lprocfs_static_vars  lvars;
4590                 struct obd_device          *obd = d->ld_obd;
4591
4592                 /* For interoperability */
4593                 struct cfg_interop_param   *ptr = NULL;
4594                 struct lustre_cfg          *old_cfg = NULL;
4595                 char                       *param = NULL;
4596
4597                 param = lustre_cfg_string(cfg, 1);
4598                 if (param == NULL) {
4599                         CERROR("param is empty\n");
4600                         rc = -EINVAL;
4601                         break;
4602                 }
4603
4604                 ptr = class_find_old_param(param, mdt_interop_param);
4605                 if (ptr != NULL) {
4606                         if (ptr->new_param == NULL) {
4607                                 rc = 0;
4608                                 CWARN("For interoperability, skip this %s."
4609                                       " It is obsolete.\n", ptr->old_param);
4610                                 break;
4611                         }
4612
4613                         CWARN("Found old param %s, changed it to %s.\n",
4614                               ptr->old_param, ptr->new_param);
4615
4616                         old_cfg = cfg;
4617                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4618                         if (IS_ERR(cfg)) {
4619                                 rc = PTR_ERR(cfg);
4620                                 break;
4621                         }
4622                 }
4623
4624                 lprocfs_mdt_init_vars(&lvars);
4625                 rc = class_process_proc_param(PARAM_MDT, lvars.obd_vars,
4626                                               cfg, obd);
4627                 if (rc > 0 || rc == -ENOSYS) {
4628                         /* is it an HSM var ? */
4629                         rc = class_process_proc_param(PARAM_HSM,
4630                                                       hsm_cdt_get_proc_vars(),
4631                                                       cfg, obd);
4632                         if (rc > 0 || rc == -ENOSYS)
4633                                 /* we don't understand; pass it on */
4634                                 rc = next->ld_ops->ldo_process_config(env, next,
4635                                                                       cfg);
4636                 }
4637
4638                 if (old_cfg != NULL)
4639                         lustre_cfg_free(cfg);
4640
4641                 break;
4642         }
4643         default:
4644                 /* others are passed further */
4645                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4646                 break;
4647         }
4648         RETURN(rc);
4649 }
4650
4651 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4652                                           const struct lu_object_header *hdr,
4653                                           struct lu_device *d)
4654 {
4655         struct mdt_object *mo;
4656
4657         ENTRY;
4658
4659         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4660         if (mo != NULL) {
4661                 struct lu_object *o;
4662                 struct lu_object_header *h;
4663
4664                 o = &mo->mot_obj;
4665                 h = &mo->mot_header;
4666                 lu_object_header_init(h);
4667                 lu_object_init(o, h, d);
4668                 lu_object_add_top(h, o);
4669                 o->lo_ops = &mdt_obj_ops;
4670                 mutex_init(&mo->mot_ioepoch_mutex);
4671                 mutex_init(&mo->mot_lov_mutex);
4672                 init_rwsem(&mo->mot_open_sem);
4673                 RETURN(o);
4674         }
4675         RETURN(NULL);
4676 }
4677
4678 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4679                            const struct lu_object_conf *unused)
4680 {
4681         struct mdt_device *d = mdt_dev(o->lo_dev);
4682         struct lu_device  *under;
4683         struct lu_object  *below;
4684         int                rc = 0;
4685         ENTRY;
4686
4687         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4688                PFID(lu_object_fid(o)));
4689
4690         under = &d->mdt_child->md_lu_dev;
4691         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4692         if (below != NULL) {
4693                 lu_object_add(o, below);
4694         } else
4695                 rc = -ENOMEM;
4696
4697         RETURN(rc);
4698 }
4699
4700 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4701 {
4702         struct mdt_object *mo = mdt_obj(o);
4703         struct lu_object_header *h;
4704         ENTRY;
4705
4706         h = o->lo_header;
4707         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4708                PFID(lu_object_fid(o)));
4709
4710         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4711         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4712
4713         lu_object_fini(o);
4714         lu_object_header_fini(h);
4715         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4716
4717         EXIT;
4718 }
4719
4720 static int mdt_object_print(const struct lu_env *env, void *cookie,
4721                             lu_printer_t p, const struct lu_object *o)
4722 {
4723         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4724         return (*p)(env, cookie, LUSTRE_MDT_NAME"-object@%p(ioepoch="LPU64" "
4725                     "flags="LPX64", epochcount=%d, writecount=%d)",
4726                     mdto, mdto->mot_ioepoch, mdto->mot_flags,
4727                     mdto->mot_ioepoch_count, mdto->mot_writecount);
4728 }
4729
4730 static int mdt_prepare(const struct lu_env *env,
4731                 struct lu_device *pdev,
4732                 struct lu_device *cdev)
4733 {
4734         struct mdt_device *mdt = mdt_dev(cdev);
4735         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4736         struct obd_device *obd = cdev->ld_obd;
4737         struct lfsck_start_param lsp;
4738         int rc;
4739
4740         ENTRY;
4741
4742         LASSERT(obd);
4743
4744         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4745         if (rc)
4746                 RETURN(rc);
4747
4748         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4749         if (rc)
4750                 RETURN(rc);
4751
4752         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4753         if (rc)
4754                 RETURN(rc);
4755
4756         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4757         /* The LFSCK instance is registered just now, so it must be there when
4758          * register the namespace to such instance. */
4759         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4760
4761         lsp.lsp_start = NULL;
4762         lsp.lsp_index_valid = 0;
4763         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
4764                                                    OBD_IOC_START_LFSCK,
4765                                                    0, &lsp);
4766         if (rc != 0) {
4767                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
4768                       mdt_obd_name(mdt), rc);
4769                 rc = 0;
4770         }
4771
4772         if (mdt->mdt_seq_site.ss_node_id == 0) {
4773                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4774                                                          &mdt->mdt_md_root_fid);
4775                 if (rc)
4776                         RETURN(rc);
4777         }
4778
4779         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4780         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4781         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4782         LASSERT(obd->obd_no_conn);
4783         spin_lock(&obd->obd_dev_lock);
4784         obd->obd_no_conn = 0;
4785         spin_unlock(&obd->obd_dev_lock);
4786
4787         if (obd->obd_recovering == 0)
4788                 mdt_postrecov(env, mdt);
4789
4790         RETURN(rc);
4791 }
4792
4793 const struct lu_device_operations mdt_lu_ops = {
4794         .ldo_object_alloc   = mdt_object_alloc,
4795         .ldo_process_config = mdt_process_config,
4796         .ldo_prepare        = mdt_prepare,
4797 };
4798
4799 static const struct lu_object_operations mdt_obj_ops = {
4800         .loo_object_init    = mdt_object_init,
4801         .loo_object_free    = mdt_object_free,
4802         .loo_object_print   = mdt_object_print
4803 };
4804
4805 static int mdt_obd_set_info_async(const struct lu_env *env,
4806                                   struct obd_export *exp,
4807                                   __u32 keylen, void *key,
4808                                   __u32 vallen, void *val,
4809                                   struct ptlrpc_request_set *set)
4810 {
4811         int rc;
4812
4813         ENTRY;
4814
4815         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4816                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4817                 RETURN(rc);
4818         }
4819
4820         RETURN(0);
4821 }
4822
4823 /**
4824  * Match client and server connection feature flags.
4825  *
4826  * Compute the compatibility flags for a connection request based on
4827  * features mutually supported by client and server.
4828  *
4829  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4830  * must not be updated here, otherwise a partially initialized value may
4831  * be exposed. After the connection request is successfully processed,
4832  * the top-level MDT connect request handler atomically updates the export
4833  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4834  * reply. \see mdt_connect().
4835  *
4836  * \param exp   the obd_export associated with this client/target pair
4837  * \param mdt   the target device for the connection
4838  * \param data  stores data for this connect request
4839  *
4840  * \retval 0       success
4841  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4842  * \retval -EBADE  client and server feature requirements are incompatible
4843  */
4844 static int mdt_connect_internal(struct obd_export *exp,
4845                                 struct mdt_device *mdt,
4846                                 struct obd_connect_data *data)
4847 {
4848         LASSERT(data != NULL);
4849
4850         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4851         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4852
4853         /* If no known bits (which should not happen, probably,
4854            as everybody should support LOOKUP and UPDATE bits at least)
4855            revert to compat mode with plain locks. */
4856         if (!data->ocd_ibits_known &&
4857             data->ocd_connect_flags & OBD_CONNECT_IBITS)
4858                 data->ocd_connect_flags &= ~OBD_CONNECT_IBITS;
4859
4860         if (!mdt->mdt_opts.mo_acl)
4861                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4862
4863         if (!mdt->mdt_opts.mo_user_xattr)
4864                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4865
4866         if (!mdt->mdt_som_conf)
4867                 data->ocd_connect_flags &= ~OBD_CONNECT_SOM;
4868
4869         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4870                 data->ocd_brw_size = min(data->ocd_brw_size,
4871                                          (__u32)MD_MAX_BRW_SIZE);
4872                 if (data->ocd_brw_size == 0) {
4873                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4874                                " ocd_version: %x ocd_grant: %d "
4875                                "ocd_index: %u ocd_brw_size is "
4876                                "unexpectedly zero, network data "
4877                                "corruption? Refusing connection of this"
4878                                " client\n",
4879                                mdt_obd_name(mdt),
4880                                exp->exp_client_uuid.uuid,
4881                                exp, data->ocd_connect_flags, data->ocd_version,
4882                                data->ocd_grant, data->ocd_index);
4883                         return -EPROTO;
4884                 }
4885         }
4886
4887         /* NB: Disregard the rule against updating
4888          * exp_connect_data.ocd_connect_flags in this case, since
4889          * tgt_client_new() needs to know if this is a lightweight
4890          * connection, and it is safe to expose this flag before
4891          * connection processing completes. */
4892         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
4893                 spin_lock(&exp->exp_lock);
4894                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
4895                 spin_unlock(&exp->exp_lock);
4896         }
4897
4898         data->ocd_version = LUSTRE_VERSION_CODE;
4899
4900         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
4901                 CWARN("%s: MDS requires FID support, but client not\n",
4902                       mdt_obd_name(mdt));
4903                 return -EBADE;
4904         }
4905
4906         if (mdt->mdt_som_conf &&
4907             !(data->ocd_connect_flags & (OBD_CONNECT_LIGHTWEIGHT |
4908                                          OBD_CONNECT_MDS_MDS |
4909                                          OBD_CONNECT_SOM))) {
4910                 CWARN("%s: MDS has SOM enabled, but client does not support "
4911                       "it\n", mdt_obd_name(mdt));
4912                 return -EBADE;
4913         }
4914
4915         if (OCD_HAS_FLAG(data, PINGLESS)) {
4916                 if (ptlrpc_pinger_suppress_pings()) {
4917                         spin_lock(&exp->exp_obd->obd_dev_lock);
4918                         list_del_init(&exp->exp_obd_chain_timed);
4919                         spin_unlock(&exp->exp_obd->obd_dev_lock);
4920                 } else {
4921                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
4922                 }
4923         }
4924
4925         data->ocd_max_easize = mdt->mdt_max_ea_size;
4926
4927         return 0;
4928 }
4929
4930 /* mds_connect copy */
4931 static int mdt_obd_connect(const struct lu_env *env,
4932                            struct obd_export **exp, struct obd_device *obd,
4933                            struct obd_uuid *cluuid,
4934                            struct obd_connect_data *data,
4935                            void *localdata)
4936 {
4937         struct obd_export      *lexp;
4938         struct lustre_handle    conn = { 0 };
4939         struct mdt_device      *mdt;
4940         int                     rc;
4941         ENTRY;
4942
4943         LASSERT(env != NULL);
4944         if (!exp || !obd || !cluuid)
4945                 RETURN(-EINVAL);
4946
4947         mdt = mdt_dev(obd->obd_lu_dev);
4948
4949         /*
4950          * first, check whether the stack is ready to handle requests
4951          * XXX: probably not very appropriate method is used now
4952          *      at some point we should find a better one
4953          */
4954         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
4955             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
4956                 rc = obd_get_info(env, mdt->mdt_child_exp,
4957                                   sizeof(KEY_OSP_CONNECTED),
4958                                   KEY_OSP_CONNECTED, NULL, NULL, NULL);
4959                 if (rc)
4960                         RETURN(-EAGAIN);
4961                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
4962         }
4963
4964         rc = class_connect(&conn, obd, cluuid);
4965         if (rc)
4966                 RETURN(rc);
4967
4968         lexp = class_conn2export(&conn);
4969         LASSERT(lexp != NULL);
4970
4971         rc = mdt_connect_internal(lexp, mdt, data);
4972         if (rc == 0) {
4973                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
4974
4975                 LASSERT(lcd);
4976                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
4977                 rc = tgt_client_new(env, lexp);
4978                 if (rc == 0)
4979                         mdt_export_stats_init(obd, lexp, localdata);
4980
4981                 /* For phase I, sync for cross-ref operation. */
4982                 lexp->exp_keep_sync = 1;
4983         }
4984
4985         if (rc != 0) {
4986                 class_disconnect(lexp);
4987                 *exp = NULL;
4988         } else {
4989                 *exp = lexp;
4990         }
4991
4992         RETURN(rc);
4993 }
4994
4995 static int mdt_obd_reconnect(const struct lu_env *env,
4996                              struct obd_export *exp, struct obd_device *obd,
4997                              struct obd_uuid *cluuid,
4998                              struct obd_connect_data *data,
4999                              void *localdata)
5000 {
5001         int                     rc;
5002         ENTRY;
5003
5004         if (exp == NULL || obd == NULL || cluuid == NULL)
5005                 RETURN(-EINVAL);
5006
5007         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5008         if (rc == 0)
5009                 mdt_export_stats_init(obd, exp, localdata);
5010
5011         RETURN(rc);
5012 }
5013
5014 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5015                                    struct mdt_thread_info *info,
5016                                    struct mdt_file_data *mfd)
5017 {
5018         struct lu_context ses;
5019         int rc;
5020         ENTRY;
5021
5022         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5023         if (rc)
5024                 RETURN(rc);
5025
5026         env->le_ses = &ses;
5027         lu_context_enter(&ses);
5028
5029         mdt_ucred(info)->uc_valid = UCRED_OLD;
5030         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5031
5032         lu_context_exit(&ses);
5033         lu_context_fini(&ses);
5034         env->le_ses = NULL;
5035
5036         RETURN(rc);
5037 }
5038
5039 static int mdt_export_cleanup(struct obd_export *exp)
5040 {
5041         struct mdt_export_data *med = &exp->exp_mdt_data;
5042         struct obd_device      *obd = exp->exp_obd;
5043         struct mdt_device      *mdt;
5044         struct mdt_thread_info *info;
5045         struct lu_env           env;
5046         CFS_LIST_HEAD(closing_list);
5047         struct mdt_file_data *mfd, *n;
5048         int rc = 0;
5049         ENTRY;
5050
5051         spin_lock(&med->med_open_lock);
5052         while (!cfs_list_empty(&med->med_open_head)) {
5053                 cfs_list_t *tmp = med->med_open_head.next;
5054                 mfd = cfs_list_entry(tmp, struct mdt_file_data, mfd_list);
5055
5056                 /* Remove mfd handle so it can't be found again.
5057                  * We are consuming the mfd_list reference here. */
5058                 class_handle_unhash(&mfd->mfd_handle);
5059                 cfs_list_move_tail(&mfd->mfd_list, &closing_list);
5060         }
5061         spin_unlock(&med->med_open_lock);
5062         mdt = mdt_dev(obd->obd_lu_dev);
5063         LASSERT(mdt != NULL);
5064
5065         rc = lu_env_init(&env, LCT_MD_THREAD);
5066         if (rc)
5067                 RETURN(rc);
5068
5069         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5070         LASSERT(info != NULL);
5071         memset(info, 0, sizeof *info);
5072         info->mti_env = &env;
5073         info->mti_mdt = mdt;
5074         info->mti_exp = exp;
5075
5076         if (!cfs_list_empty(&closing_list)) {
5077                 struct md_attr *ma = &info->mti_attr;
5078
5079                 /* Close any open files (which may also cause orphan unlinking). */
5080                 cfs_list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5081                         cfs_list_del_init(&mfd->mfd_list);
5082                         ma->ma_need = ma->ma_valid = 0;
5083
5084                         /* This file is being closed due to an eviction, it
5085                          * could have been modified and now dirty regarding to
5086                          * HSM archive, check this!
5087                          * The logic here is to mark a file dirty if there's a
5088                          * chance it was dirtied before the client was evicted,
5089                          * so that we don't have to wait for a release attempt
5090                          * before finding out the file was actually dirty and
5091                          * fail the release. Aggressively marking it dirty here
5092                          * will cause the policy engine to attempt to
5093                          * re-archive it; when rearchiving, we can compare the
5094                          * current version to the HSM data_version and make the
5095                          * archive request into a noop if it's not actually
5096                          * dirty.
5097                          */
5098                         if (mfd->mfd_mode & (FMODE_WRITE|MDS_FMODE_TRUNC))
5099                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5100
5101                         /* Don't unlink orphan on failover umount, LU-184 */
5102                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
5103                                 ma->ma_valid = MA_FLAGS;
5104                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5105                         }
5106                         mdt_mfd_close(info, mfd);
5107                 }
5108         }
5109         info->mti_mdt = NULL;
5110         /* cleanup client slot early */
5111         /* Do not erase record for recoverable client. */
5112         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
5113                 tgt_client_del(&env, exp);
5114         lu_env_fini(&env);
5115
5116         RETURN(rc);
5117 }
5118
5119 static int mdt_obd_disconnect(struct obd_export *exp)
5120 {
5121         int rc;
5122         ENTRY;
5123
5124         LASSERT(exp);
5125         class_export_get(exp);
5126
5127         rc = server_disconnect_export(exp);
5128         if (rc != 0)
5129                 CDEBUG(D_IOCTL, "server disconnect error: %d\n", rc);
5130
5131         rc = mdt_export_cleanup(exp);
5132         class_export_put(exp);
5133         RETURN(rc);
5134 }
5135
5136 /* FIXME: Can we avoid using these two interfaces? */
5137 static int mdt_init_export(struct obd_export *exp)
5138 {
5139         struct mdt_export_data *med = &exp->exp_mdt_data;
5140         int                     rc;
5141         ENTRY;
5142
5143         CFS_INIT_LIST_HEAD(&med->med_open_head);
5144         spin_lock_init(&med->med_open_lock);
5145         mutex_init(&med->med_idmap_mutex);
5146         med->med_idmap = NULL;
5147         spin_lock(&exp->exp_lock);
5148         exp->exp_connecting = 1;
5149         spin_unlock(&exp->exp_lock);
5150
5151         /* self-export doesn't need client data and ldlm initialization */
5152         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5153                                      &exp->exp_client_uuid)))
5154                 RETURN(0);
5155
5156         rc = tgt_client_alloc(exp);
5157         if (rc)
5158                 GOTO(err, rc);
5159
5160         rc = ldlm_init_export(exp);
5161         if (rc)
5162                 GOTO(err_free, rc);
5163
5164         RETURN(rc);
5165
5166 err_free:
5167         tgt_client_free(exp);
5168 err:
5169         CERROR("%s: Failed to initialize export: rc = %d\n",
5170                exp->exp_obd->obd_name, rc);
5171         return rc;
5172 }
5173
5174 static int mdt_destroy_export(struct obd_export *exp)
5175 {
5176         ENTRY;
5177
5178         if (exp_connect_rmtclient(exp))
5179                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5180
5181         target_destroy_export(exp);
5182         /* destroy can be called from failed obd_setup, so
5183          * checking uuid is safer than obd_self_export */
5184         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5185                                      &exp->exp_client_uuid)))
5186                 RETURN(0);
5187
5188         ldlm_destroy_export(exp);
5189         tgt_client_free(exp);
5190
5191         LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
5192         LASSERT(cfs_list_empty(&exp->exp_mdt_data.med_open_head));
5193
5194         RETURN(0);
5195 }
5196
5197 /** The maximum depth that fid2path() will search.
5198  * This is limited only because we want to store the fids for
5199  * historical path lookup purposes.
5200  */
5201 #define MAX_PATH_DEPTH 100
5202
5203 /** mdt_path() lookup structure. */
5204 struct path_lookup_info {
5205         __u64                   pli_recno;      /**< history point */
5206         __u64                   pli_currec;     /**< current record */
5207         struct lu_fid           pli_fid;
5208         struct lu_fid           pli_fids[MAX_PATH_DEPTH]; /**< path, in fids */
5209         struct mdt_object       *pli_mdt_obj;
5210         char                    *pli_path;      /**< full path */
5211         int                     pli_pathlen;
5212         int                     pli_linkno;     /**< which hardlink to follow */
5213         int                     pli_fidcount;   /**< number of \a pli_fids */
5214 };
5215
5216 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5217                    struct linkea_data *ldata)
5218 {
5219         int rc;
5220
5221         LASSERT(ldata->ld_buf->lb_buf != NULL);
5222
5223         if (!mdt_object_exists(mdt_obj))
5224                 return -ENODATA;
5225
5226         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5227                           ldata->ld_buf, XATTR_NAME_LINK);
5228         if (rc == -ERANGE) {
5229                 /* Buf was too small, figure out what we need. */
5230                 lu_buf_free(ldata->ld_buf);
5231                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5232                                   ldata->ld_buf, XATTR_NAME_LINK);
5233                 if (rc < 0)
5234                         return rc;
5235                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5236                 if (ldata->ld_buf->lb_buf == NULL)
5237                         return -ENOMEM;
5238                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5239                                   ldata->ld_buf, XATTR_NAME_LINK);
5240         }
5241         if (rc < 0)
5242                 return rc;
5243
5244         return linkea_init(ldata);
5245 }
5246
5247 static int mdt_path_current(struct mdt_thread_info *info,
5248                             struct path_lookup_info *pli)
5249 {
5250         struct mdt_device       *mdt = info->mti_mdt;
5251         struct mdt_object       *mdt_obj;
5252         struct link_ea_header   *leh;
5253         struct link_ea_entry    *lee;
5254         struct lu_name          *tmpname = &info->mti_name;
5255         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5256         struct lu_buf           *buf = &info->mti_big_buf;
5257         char                    *ptr;
5258         int                     reclen;
5259         struct linkea_data      ldata = { 0 };
5260         int                     rc = 0;
5261         ENTRY;
5262
5263         /* temp buffer for path element, the buffer will be finally freed
5264          * in mdt_thread_info_fini */
5265         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5266         if (buf->lb_buf == NULL)
5267                 RETURN(-ENOMEM);
5268
5269         ldata.ld_buf = buf;
5270         ptr = pli->pli_path + pli->pli_pathlen - 1;
5271         *ptr = 0;
5272         --ptr;
5273         pli->pli_fidcount = 0;
5274         pli->pli_fids[0] = *(struct lu_fid *)mdt_object_fid(pli->pli_mdt_obj);
5275
5276         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5277          * so checking root_fid can only happen on MDT0. */
5278         while (!lu_fid_eq(&mdt->mdt_md_root_fid,
5279                           &pli->pli_fids[pli->pli_fidcount])) {
5280                 mdt_obj = mdt_object_find(info->mti_env, mdt,
5281                                           &pli->pli_fids[pli->pli_fidcount]);
5282                 if (IS_ERR(mdt_obj))
5283                         GOTO(out, rc = PTR_ERR(mdt_obj));
5284                 if (mdt_object_remote(mdt_obj)) {
5285                         mdt_object_put(info->mti_env, mdt_obj);
5286                         GOTO(remote_out, rc = -EREMOTE);
5287                 }
5288                 if (!mdt_object_exists(mdt_obj)) {
5289                         mdt_object_put(info->mti_env, mdt_obj);
5290                         GOTO(out, rc = -ENOENT);
5291                 }
5292
5293                 rc = mdt_links_read(info, mdt_obj, &ldata);
5294                 mdt_object_put(info->mti_env, mdt_obj);
5295                 if (rc != 0)
5296                         GOTO(out, rc);
5297
5298                 leh = buf->lb_buf;
5299                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5300                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5301                 /* If set, use link #linkno for path lookup, otherwise use
5302                    link #0.  Only do this for the final path element. */
5303                 if (pli->pli_fidcount == 0 &&
5304                     pli->pli_linkno < leh->leh_reccount) {
5305                         int count;
5306                         for (count = 0; count < pli->pli_linkno; count++) {
5307                                 lee = (struct link_ea_entry *)
5308                                      ((char *)lee + reclen);
5309                                 linkea_entry_unpack(lee, &reclen, tmpname,
5310                                                     tmpfid);
5311                         }
5312                         if (pli->pli_linkno < leh->leh_reccount - 1)
5313                                 /* indicate to user there are more links */
5314                                 pli->pli_linkno++;
5315                 }
5316
5317                 /* Pack the name in the end of the buffer */
5318                 ptr -= tmpname->ln_namelen;
5319                 if (ptr - 1 <= pli->pli_path)
5320                         GOTO(out, rc = -EOVERFLOW);
5321                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5322                 *(--ptr) = '/';
5323
5324                 /* Store the parent fid for historic lookup */
5325                 if (++pli->pli_fidcount >= MAX_PATH_DEPTH)
5326                         GOTO(out, rc = -EOVERFLOW);
5327                 pli->pli_fids[pli->pli_fidcount] = *tmpfid;
5328         }
5329
5330 remote_out:
5331         ptr++; /* skip leading / */
5332         memmove(pli->pli_path, ptr, pli->pli_path + pli->pli_pathlen - ptr);
5333
5334         EXIT;
5335 out:
5336         return rc;
5337 }
5338
5339 /* Returns the full path to this fid, as of changelog record recno. */
5340 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5341                     char *path, int pathlen, __u64 *recno, int *linkno,
5342                     struct lu_fid *fid)
5343 {
5344         struct mdt_device       *mdt = info->mti_mdt;
5345         struct path_lookup_info *pli;
5346         int                     tries = 3;
5347         int                     rc = -EAGAIN;
5348         ENTRY;
5349
5350         if (pathlen < 3)
5351                 RETURN(-EOVERFLOW);
5352
5353         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5354                 path[0] = '\0';
5355                 RETURN(0);
5356         }
5357
5358         OBD_ALLOC_PTR(pli);
5359         if (pli == NULL)
5360                 RETURN(-ENOMEM);
5361
5362         pli->pli_mdt_obj = obj;
5363         pli->pli_recno = *recno;
5364         pli->pli_path = path;
5365         pli->pli_pathlen = pathlen;
5366         pli->pli_linkno = *linkno;
5367
5368         /* Retry multiple times in case file is being moved */
5369         while (tries-- && rc == -EAGAIN)
5370                 rc = mdt_path_current(info, pli);
5371
5372         /* return the last resolved fids to the client, so the client will
5373          * build the left path on another MDT for remote object */
5374         *fid = pli->pli_fids[pli->pli_fidcount];
5375
5376         *recno = pli->pli_currec;
5377         /* Return next link index to caller */
5378         *linkno = pli->pli_linkno;
5379
5380         OBD_FREE_PTR(pli);
5381
5382         RETURN(rc);
5383 }
5384
5385 static int mdt_fid2path(struct mdt_thread_info *info,
5386                         struct getinfo_fid2path *fp)
5387 {
5388         struct mdt_device *mdt = info->mti_mdt;
5389         struct mdt_object *obj;
5390         int    rc;
5391         ENTRY;
5392
5393         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5394                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5395
5396         if (!fid_is_sane(&fp->gf_fid))
5397                 RETURN(-EINVAL);
5398
5399         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5400                 CWARN("%s: "DFID" is invalid, sequence should be "
5401                       ">= "LPX64"\n", mdt_obd_name(mdt),
5402                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5403                 RETURN(-EINVAL);
5404         }
5405
5406         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5407         if (obj == NULL || IS_ERR(obj)) {
5408                 CDEBUG(D_IOCTL, "no object "DFID": %ld\n", PFID(&fp->gf_fid),
5409                        PTR_ERR(obj));
5410                 RETURN(-EINVAL);
5411         }
5412
5413         if (mdt_object_remote(obj))
5414                 rc = -EREMOTE;
5415         else if (!mdt_object_exists(obj))
5416                 rc = -ENOENT;
5417         else
5418                 rc = 0;
5419
5420         if (rc < 0) {
5421                 mdt_object_put(info->mti_env, obj);
5422                 CDEBUG(D_IOCTL, "nonlocal object "DFID": %d\n",
5423                        PFID(&fp->gf_fid), rc);
5424                 RETURN(rc);
5425         }
5426
5427         rc = mdt_path(info, obj, fp->gf_path, fp->gf_pathlen, &fp->gf_recno,
5428                       &fp->gf_linkno, &fp->gf_fid);
5429
5430         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5431                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5432
5433         mdt_object_put(info->mti_env, obj);
5434
5435         RETURN(rc);
5436 }
5437
5438 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5439                             void *val, int vallen)
5440 {
5441         struct getinfo_fid2path *fpout, *fpin;
5442         int rc = 0;
5443
5444         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5445         fpout = val;
5446
5447         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5448                 lustre_swab_fid2path(fpin);
5449
5450         memcpy(fpout, fpin, sizeof(*fpin));
5451         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5452                 RETURN(-EINVAL);
5453
5454         rc = mdt_fid2path(info, fpout);
5455         RETURN(rc);
5456 }
5457
5458 int mdt_get_info(struct tgt_session_info *tsi)
5459 {
5460         char    *key;
5461         int      keylen;
5462         __u32   *vallen;
5463         void    *valout;
5464         int      rc;
5465
5466         ENTRY;
5467
5468         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5469         if (key == NULL) {
5470                 CDEBUG(D_IOCTL, "No GETINFO key");
5471                 RETURN(err_serious(-EFAULT));
5472         }
5473         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5474                                       RCL_CLIENT);
5475
5476         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5477         if (vallen == NULL) {
5478                 CDEBUG(D_IOCTL, "Unable to get RMF_GETINFO_VALLEN buffer");
5479                 RETURN(err_serious(-EFAULT));
5480         }
5481
5482         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5483                              *vallen);
5484         rc = req_capsule_server_pack(tsi->tsi_pill);
5485         if (rc)
5486                 RETURN(err_serious(rc));
5487
5488         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5489         if (valout == NULL) {
5490                 CDEBUG(D_IOCTL, "Unable to get get-info RPC out buffer");
5491                 RETURN(err_serious(-EFAULT));
5492         }
5493
5494         if (KEY_IS(KEY_FID2PATH)) {
5495                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5496
5497                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5498                 mdt_thread_info_fini(info);
5499         } else {
5500                 rc = -EINVAL;
5501         }
5502         RETURN(rc);
5503 }
5504
5505 /* Pass the ioc down */
5506 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5507                          unsigned int cmd, int len, void *data)
5508 {
5509         struct lu_context ioctl_session;
5510         struct md_device *next = mdt->mdt_child;
5511         int rc;
5512         ENTRY;
5513
5514         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5515         if (rc)
5516                 RETURN(rc);
5517         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5518         lu_context_enter(&ioctl_session);
5519         env->le_ses = &ioctl_session;
5520
5521         LASSERT(next->md_ops->mdo_iocontrol);
5522         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5523
5524         lu_context_exit(&ioctl_session);
5525         lu_context_fini(&ioctl_session);
5526         RETURN(rc);
5527 }
5528
5529 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5530 {
5531         struct obd_ioctl_data *data = karg;
5532         struct lu_fid *fid;
5533         __u64 version;
5534         struct mdt_object *obj;
5535         struct mdt_lock_handle  *lh;
5536         int rc;
5537         ENTRY;
5538
5539         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5540             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5541                 RETURN(-EINVAL);
5542
5543         fid = (struct lu_fid *)data->ioc_inlbuf1;
5544
5545         if (!fid_is_sane(fid))
5546                 RETURN(-EINVAL);
5547
5548         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5549
5550         lh = &mti->mti_lh[MDT_LH_PARENT];
5551         mdt_lock_reg_init(lh, LCK_CR);
5552
5553         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5554         if (IS_ERR(obj))
5555                 RETURN(PTR_ERR(obj));
5556
5557         if (mdt_object_remote(obj)) {
5558                 rc = -EREMOTE;
5559                 /**
5560                  * before calling version get the correct MDS should be
5561                  * fid, this is error to find remote object here
5562                  */
5563                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5564         } else if (!mdt_object_exists(obj)) {
5565                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5566                 rc = -ENOENT;
5567         } else {
5568                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5569                *(__u64 *)data->ioc_inlbuf2 = version;
5570                 rc = 0;
5571         }
5572         mdt_object_unlock_put(mti, obj, lh, 1);
5573         RETURN(rc);
5574 }
5575
5576 /* ioctls on obd dev */
5577 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5578                          void *karg, void *uarg)
5579 {
5580         struct lu_env      env;
5581         struct obd_device *obd = exp->exp_obd;
5582         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5583         struct dt_device  *dt = mdt->mdt_bottom;
5584         int rc;
5585
5586         ENTRY;
5587         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5588         rc = lu_env_init(&env, LCT_MD_THREAD);
5589         if (rc)
5590                 RETURN(rc);
5591
5592         switch (cmd) {
5593         case OBD_IOC_SYNC:
5594                 rc = mdt_device_sync(&env, mdt);
5595                 break;
5596         case OBD_IOC_SET_READONLY:
5597                 rc = dt->dd_ops->dt_ro(&env, dt);
5598                 break;
5599         case OBD_IOC_ABORT_RECOVERY:
5600                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5601                 target_stop_recovery_thread(obd);
5602                 rc = 0;
5603                 break;
5604         case OBD_IOC_CHANGELOG_REG:
5605         case OBD_IOC_CHANGELOG_DEREG:
5606         case OBD_IOC_CHANGELOG_CLEAR:
5607                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5608                 break;
5609         case OBD_IOC_START_LFSCK: {
5610                 struct md_device *next = mdt->mdt_child;
5611                 struct obd_ioctl_data *data = karg;
5612                 struct lfsck_start_param lsp;
5613
5614                 if (unlikely(data == NULL)) {
5615                         rc = -EINVAL;
5616                         break;
5617                 }
5618
5619                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5620                 lsp.lsp_index_valid = 0;
5621                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5622                 break;
5623         }
5624         case OBD_IOC_STOP_LFSCK: {
5625                 struct md_device        *next = mdt->mdt_child;
5626                 struct obd_ioctl_data   *data = karg;
5627                 struct lfsck_stop        stop;
5628
5629                 stop.ls_status = LS_STOPPED;
5630                 /* Old lfsck utils may pass NULL @stop. */
5631                 if (data->ioc_inlbuf1 == NULL)
5632                         stop.ls_flags = 0;
5633                 else
5634                         stop.ls_flags =
5635                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5636
5637                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5638                 break;
5639         }
5640         case OBD_IOC_GET_OBJ_VERSION: {
5641                 struct mdt_thread_info *mti;
5642                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5643                 memset(mti, 0, sizeof *mti);
5644                 mti->mti_env = &env;
5645                 mti->mti_mdt = mdt;
5646                 mti->mti_exp = exp;
5647
5648                 rc = mdt_ioc_version_get(mti, karg);
5649                 break;
5650         }
5651         case OBD_IOC_CATLOGLIST: {
5652                 struct mdt_thread_info *mti;
5653
5654                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5655                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5656                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5657                                        &mti->mti_tmp_fid1);
5658                 break;
5659          }
5660         default:
5661                 rc = -EOPNOTSUPP;
5662                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5663                         mdt_obd_name(mdt), cmd, rc);
5664         }
5665
5666         lu_env_fini(&env);
5667         RETURN(rc);
5668 }
5669
5670 int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5671 {
5672         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5673         int rc;
5674         ENTRY;
5675
5676         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5677         RETURN(rc);
5678 }
5679
5680 int mdt_obd_postrecov(struct obd_device *obd)
5681 {
5682         struct lu_env env;
5683         int rc;
5684
5685         rc = lu_env_init(&env, LCT_MD_THREAD);
5686         if (rc)
5687                 RETURN(rc);
5688         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5689         lu_env_fini(&env);
5690         return rc;
5691 }
5692
5693 static struct obd_ops mdt_obd_device_ops = {
5694         .o_owner          = THIS_MODULE,
5695         .o_set_info_async = mdt_obd_set_info_async,
5696         .o_connect        = mdt_obd_connect,
5697         .o_reconnect      = mdt_obd_reconnect,
5698         .o_disconnect     = mdt_obd_disconnect,
5699         .o_init_export    = mdt_init_export,
5700         .o_destroy_export = mdt_destroy_export,
5701         .o_iocontrol      = mdt_iocontrol,
5702         .o_postrecov      = mdt_obd_postrecov,
5703 };
5704
5705 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5706                                          struct lu_device *d)
5707 {
5708         struct mdt_device *m = mdt_dev(d);
5709         ENTRY;
5710
5711         mdt_fini(env, m);
5712         RETURN(NULL);
5713 }
5714
5715 static struct lu_device *mdt_device_free(const struct lu_env *env,
5716                                          struct lu_device *d)
5717 {
5718         struct mdt_device *m = mdt_dev(d);
5719         ENTRY;
5720
5721         lu_device_fini(&m->mdt_lu_dev);
5722         OBD_FREE_PTR(m);
5723
5724         RETURN(NULL);
5725 }
5726
5727 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5728                                           struct lu_device_type *t,
5729                                           struct lustre_cfg *cfg)
5730 {
5731         struct lu_device  *l;
5732         struct mdt_device *m;
5733
5734         OBD_ALLOC_PTR(m);
5735         if (m != NULL) {
5736                 int rc;
5737
5738                 l = &m->mdt_lu_dev;
5739                 rc = mdt_init0(env, m, t, cfg);
5740                 if (rc != 0) {
5741                         mdt_device_free(env, l);
5742                         l = ERR_PTR(rc);
5743                         return l;
5744                 }
5745         } else
5746                 l = ERR_PTR(-ENOMEM);
5747         return l;
5748 }
5749
5750 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5751 LU_KEY_INIT(mdt, struct mdt_thread_info);
5752
5753 static void mdt_key_fini(const struct lu_context *ctx,
5754                          struct lu_context_key *key, void* data)
5755 {
5756         struct mdt_thread_info *info = data;
5757
5758         if (info->mti_big_lmm) {
5759                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5760                 info->mti_big_lmm = NULL;
5761                 info->mti_big_lmmsize = 0;
5762         }
5763         OBD_FREE_PTR(info);
5764 }
5765
5766 /* context key: mdt_thread_key */
5767 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5768
5769 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5770 {
5771         return lu_ucred(info->mti_env);
5772 }
5773
5774 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5775 {
5776         return lu_ucred_check(info->mti_env);
5777 }
5778
5779 /**
5780  * Enable/disable COS (Commit On Sharing).
5781  *
5782  * Set/Clear the COS flag in mdt options.
5783  *
5784  * \param mdt mdt device
5785  * \param val 0 disables COS, other values enable COS
5786  */
5787 void mdt_enable_cos(struct mdt_device *mdt, int val)
5788 {
5789         struct lu_env env;
5790         int rc;
5791
5792         mdt->mdt_opts.mo_cos = !!val;
5793         rc = lu_env_init(&env, LCT_LOCAL);
5794         if (unlikely(rc != 0)) {
5795                 CWARN("lu_env initialization failed with rc = %d,"
5796                       "cannot sync\n", rc);
5797                 return;
5798         }
5799         mdt_device_sync(&env, mdt);
5800         lu_env_fini(&env);
5801 }
5802
5803 /**
5804  * Check COS (Commit On Sharing) status.
5805  *
5806  * Return COS flag status.
5807  *
5808  * \param mdt mdt device
5809  */
5810 int mdt_cos_is_enabled(struct mdt_device *mdt)
5811 {
5812         return mdt->mdt_opts.mo_cos != 0;
5813 }
5814
5815 static struct lu_device_type_operations mdt_device_type_ops = {
5816         .ldto_device_alloc = mdt_device_alloc,
5817         .ldto_device_free  = mdt_device_free,
5818         .ldto_device_fini  = mdt_device_fini
5819 };
5820
5821 static struct lu_device_type mdt_device_type = {
5822         .ldt_tags     = LU_DEVICE_MD,
5823         .ldt_name     = LUSTRE_MDT_NAME,
5824         .ldt_ops      = &mdt_device_type_ops,
5825         .ldt_ctx_tags = LCT_MD_THREAD
5826 };
5827
5828 static int __init mdt_mod_init(void)
5829 {
5830         struct lprocfs_static_vars lvars;
5831         int rc;
5832
5833         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5834                  FID_NOBRACE_LEN + 1);
5835         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5836                  FID_LEN + 1);
5837         rc = lu_kmem_init(mdt_caches);
5838         if (rc)
5839                 return rc;
5840
5841         rc = mds_mod_init();
5842         if (rc)
5843                 GOTO(lu_fini, rc);
5844
5845         lprocfs_mdt_init_vars(&lvars);
5846         rc = class_register_type(&mdt_obd_device_ops, NULL, NULL,
5847 #ifndef HAVE_ONLY_PROCFS_SEQ
5848                                 lvars.module_vars,
5849 #endif
5850                                 LUSTRE_MDT_NAME, &mdt_device_type);
5851         if (rc)
5852                 GOTO(mds_fini, rc);
5853 lu_fini:
5854         if (rc)
5855                 lu_kmem_fini(mdt_caches);
5856 mds_fini:
5857         if (rc)
5858                 mds_mod_exit();
5859         return rc;
5860 }
5861
5862 static void __exit mdt_mod_exit(void)
5863 {
5864         class_unregister_type(LUSTRE_MDT_NAME);
5865         mds_mod_exit();
5866         lu_kmem_fini(mdt_caches);
5867 }
5868
5869 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5870 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5871 MODULE_LICENSE("GPL");
5872
5873 cfs_module(mdt, LUSTRE_VERSION_STRING, mdt_mod_init, mdt_mod_exit);