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 int mdt_attr_get_eabuf_size(struct mdt_thread_info *info, struct mdt_object *o)
 485 {
 486         const struct lu_env *env = info->mti_env;
 487         int rc, rc2;
 488
 489         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 490                           XATTR_NAME_LOV);
 491
 492         if (rc == -ENODATA)
 493                 rc = 0;
 494
 495         if (rc < 0)
 496                 goto out;
 497
 498         /* Is it a directory? Let's check for the LMV as well */
 499         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 500                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 501                                    XATTR_NAME_LMV);
 502                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 503                         rc = rc2;
 504         }
 505
 506 out:
 507         return rc;
 508 }
 509
 510 static int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 511                              const char *name)
 512 {
 513         const struct lu_env *env = info->mti_env;
 514         int rc;
 515         ENTRY;
 516
 517         LASSERT(info->mti_big_lmm_used == 0);
 518         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 519         if (rc < 0)
 520                 RETURN(rc);
 521
 522         /* big_lmm may need to be grown */
 523         if (info->mti_big_lmmsize < rc) {
 524                 int size = size_roundup_power2(rc);
 525
 526                 if (info->mti_big_lmmsize > 0) {
 527                         /* free old buffer */
 528                         LASSERT(info->mti_big_lmm);
 529                         OBD_FREE_LARGE(info->mti_big_lmm,
 530                                        info->mti_big_lmmsize);
 531                         info->mti_big_lmm = NULL;
 532                         info->mti_big_lmmsize = 0;
 533                 }
 534
 535                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 536                 if (info->mti_big_lmm == NULL)
 537                         RETURN(-ENOMEM);
 538                 info->mti_big_lmmsize = size;
 539         }
 540         LASSERT(info->mti_big_lmmsize >= rc);
 541
 542         info->mti_buf.lb_buf = info->mti_big_lmm;
 543         info->mti_buf.lb_len = info->mti_big_lmmsize;
 544         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 545
 546         RETURN(rc);
 547 }
 548
 549 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 550                    struct md_attr *ma, const char *name)
 551 {
 552         struct md_object *next = mdt_object_child(o);
 553         struct lu_buf    *buf = &info->mti_buf;
 554         int rc;
 555
 556         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 557                 buf->lb_buf = ma->ma_lmm;
 558                 buf->lb_len = ma->ma_lmm_size;
 559                 LASSERT(!(ma->ma_valid & MA_LOV));
 560         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 561                 buf->lb_buf = ma->ma_lmv;
 562                 buf->lb_len = ma->ma_lmv_size;
 563                 LASSERT(!(ma->ma_valid & MA_LMV));
 564         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 565                 buf->lb_buf = ma->ma_lmv;
 566                 buf->lb_len = ma->ma_lmv_size;
 567                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 568         } else {
 569                 return -EINVAL;
 570         }
 571
 572         rc = mo_xattr_get(info->mti_env, next, buf, name);
 573         if (rc > 0) {
 574                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 575                         ma->ma_lmm_size = rc;
 576                         ma->ma_valid |= MA_LOV;
 577                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 578                         ma->ma_lmv_size = rc;
 579                         ma->ma_valid |= MA_LMV;
 580                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 581                         ma->ma_lmv_size = rc;
 582                         ma->ma_valid |= MA_LMV_DEF;
 583                 }
 584
 585                 rc = 0;
 586         } else if (rc == -ENODATA) {
 587                 /* no LOV EA */
 588                 rc = 0;
 589         } else if (rc == -ERANGE) {
 590                 /* Default LMV has fixed size, so it must be able to fit
 591                  * in the original buffer */
 592                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 593                         return rc;
 594                 rc = mdt_big_xattr_get(info, o, name);
 595                 if (rc > 0) {
 596                         info->mti_big_lmm_used = 1;
 597                         if (!strcmp(name, XATTR_NAME_LOV)) {
 598                                 ma->ma_valid |= MA_LOV;
 599                                 ma->ma_lmm = info->mti_big_lmm;
 600                                 ma->ma_lmm_size = rc;
 601                         } else if (!strcmp(name, XATTR_NAME_LMV)) {
 602                                 ma->ma_valid |= MA_LMV;
 603                                 ma->ma_lmv = info->mti_big_lmm;
 604                                 ma->ma_lmv_size = rc;
 605                         } else {
 606                                 return -EINVAL;
 607                         }
 608
 609                         /* update mdt_max_mdsize so all clients
 610                          * will be aware about that */
 611                         if (info->mti_mdt->mdt_max_mdsize < rc)
 612                                 info->mti_mdt->mdt_max_mdsize = rc;
 613                         rc = 0;
 614                 }
 615         }
 616
 617         return rc;
 618 }
 619
 620 int mdt_attr_get_pfid(struct mdt_thread_info *info,
 621                       struct mdt_object *o, struct lu_fid *pfid)
 622 {
 623         struct lu_buf           *buf = &info->mti_buf;
 624         struct link_ea_header   *leh;
 625         struct link_ea_entry    *lee;
 626         int                      rc;
 627         ENTRY;
 628
 629         buf->lb_buf = info->mti_big_lmm;
 630         buf->lb_len = info->mti_big_lmmsize;
 631         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 632                           buf, XATTR_NAME_LINK);
 633         /* ignore errors, MA_PFID won't be set and it is
 634          * up to the caller to treat this as an error */
 635         if (rc == -ERANGE || buf->lb_len == 0) {
 636                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 637                 buf->lb_buf = info->mti_big_lmm;
 638                 buf->lb_len = info->mti_big_lmmsize;
 639         }
 640
 641         if (rc < 0)
 642                 RETURN(rc);
 643         if (rc < sizeof(*leh)) {
 644                 CERROR("short LinkEA on "DFID": rc = %d\n",
 645                        PFID(mdt_object_fid(o)), rc);
 646                 RETURN(-ENODATA);
 647         }
 648
 649         leh = (struct link_ea_header *) buf->lb_buf;
 650         lee = (struct link_ea_entry *)(leh + 1);
 651         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 652                 leh->leh_magic = LINK_EA_MAGIC;
 653                 leh->leh_reccount = __swab32(leh->leh_reccount);
 654                 leh->leh_len = __swab64(leh->leh_len);
 655         }
 656         if (leh->leh_magic != LINK_EA_MAGIC)
 657                 RETURN(-EINVAL);
 658         if (leh->leh_reccount == 0)
 659                 RETURN(-ENODATA);
 660
 661         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 662         fid_be_to_cpu(pfid, pfid);
 663
 664         RETURN(0);
 665 }
 666
 667 int mdt_attr_get_complex(struct mdt_thread_info *info,
 668                          struct mdt_object *o, struct md_attr *ma)
 669 {
 670         const struct lu_env *env = info->mti_env;
 671         struct md_object    *next = mdt_object_child(o);
 672         struct lu_buf       *buf = &info->mti_buf;
 673         u32                  mode = lu_object_attr(&next->mo_lu);
 674         int                  need = ma->ma_need;
 675         int                  rc = 0, rc2;
 676         ENTRY;
 677
 678         ma->ma_valid = 0;
 679
 680         if (need & MA_INODE) {
 681                 ma->ma_need = MA_INODE;
 682                 rc = mo_attr_get(env, next, ma);
 683                 if (rc)
 684                         GOTO(out, rc);
 685                 ma->ma_valid |= MA_INODE;
 686         }
 687
 688         if (need & MA_PFID) {
 689                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 690                 if (rc == 0)
 691                         ma->ma_valid |= MA_PFID;
 692                 /* ignore this error, parent fid is not mandatory */
 693                 rc = 0;
 694         }
 695
 696         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 697                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 698                 if (rc)
 699                         GOTO(out, rc);
 700         }
 701
 702         if (need & MA_LMV && S_ISDIR(mode)) {
 703                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 704                 if (rc != 0)
 705                         GOTO(out, rc);
 706         }
 707
 708         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 709                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 710                 if (rc != 0)
 711                         GOTO(out, rc);
 712         }
 713
 714         if (need & MA_SOM && S_ISREG(mode)) {
 715                 buf->lb_buf = info->mti_xattr_buf;
 716                 buf->lb_len = sizeof(info->mti_xattr_buf);
 717                 CLASSERT(sizeof(struct som_attrs) <=
 718                          sizeof(info->mti_xattr_buf));
 719                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_SOM);
 720                 rc2 = lustre_buf2som(info->mti_xattr_buf, rc2, ma->ma_som);
 721                 if (rc2 == 0)
 722                         ma->ma_valid |= MA_SOM;
 723                 else if (rc2 < 0 && rc2 != -ENODATA)
 724                         GOTO(out, rc = rc2);
 725         }
 726
 727         if (need & MA_HSM && S_ISREG(mode)) {
 728                 buf->lb_buf = info->mti_xattr_buf;
 729                 buf->lb_len = sizeof(info->mti_xattr_buf);
 730                 CLASSERT(sizeof(struct hsm_attrs) <=
 731                          sizeof(info->mti_xattr_buf));
 732                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 733                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 734                 if (rc2 == 0)
 735                         ma->ma_valid |= MA_HSM;
 736                 else if (rc2 < 0 && rc2 != -ENODATA)
 737                         GOTO(out, rc = rc2);
 738         }
 739
 740 #ifdef CONFIG_FS_POSIX_ACL
 741         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 742                 buf->lb_buf = ma->ma_acl;
 743                 buf->lb_len = ma->ma_acl_size;
 744                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 745                 if (rc2 > 0) {
 746                         ma->ma_acl_size = rc2;
 747                         ma->ma_valid |= MA_ACL_DEF;
 748                 } else if (rc2 == -ENODATA) {
 749                         /* no ACLs */
 750                         ma->ma_acl_size = 0;
 751                 } else
 752                         GOTO(out, rc = rc2);
 753         }
 754 #endif
 755 out:
 756         ma->ma_need = need;
 757         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 758                rc, ma->ma_valid, ma->ma_lmm);
 759         RETURN(rc);
 760 }
 761
 762 static int mdt_getattr_internal(struct mdt_thread_info *info,
 763                                 struct mdt_object *o, int ma_need)
 764 {
 765         struct md_object        *next = mdt_object_child(o);
 766         const struct mdt_body   *reqbody = info->mti_body;
 767         struct ptlrpc_request   *req = mdt_info_req(info);
 768         struct md_attr          *ma = &info->mti_attr;
 769         struct lu_attr          *la = &ma->ma_attr;
 770         struct req_capsule      *pill = info->mti_pill;
 771         const struct lu_env     *env = info->mti_env;
 772         struct mdt_body         *repbody;
 773         struct lu_buf           *buffer = &info->mti_buf;
 774         int                     rc;
 775         int                     is_root;
 776         ENTRY;
 777
 778         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 779                 RETURN(err_serious(-ENOMEM));
 780
 781         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 782
 783         ma->ma_valid = 0;
 784
 785         if (mdt_object_remote(o)) {
 786                 /* This object is located on remote node.*/
 787                 /* Return -EIO for old client */
 788                 if (!mdt_is_dne_client(req->rq_export))
 789                         GOTO(out, rc = -EIO);
 790
 791                 repbody->fid1 = *mdt_object_fid(o);
 792                 repbody->valid = OBD_MD_FLID | OBD_MD_MDS;
 793                 GOTO(out, rc = 0);
 794         }
 795
 796         if (reqbody->eadatasize > 0) {
 797                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 798                 if (buffer->lb_buf == NULL)
 799                         GOTO(out, rc = -EPROTO);
 800                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
 801                                                       RCL_SERVER);
 802         } else {
 803                 buffer->lb_buf = NULL;
 804                 buffer->lb_len = 0;
 805                 ma_need &= ~(MA_LOV | MA_LMV);
 806                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 807                        mdt_obd_name(info->mti_mdt),
 808                        req->rq_export->exp_client_uuid.uuid);
 809         }
 810
 811         /* If it is dir object and client require MEA, then we got MEA */
 812         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 813             (reqbody->valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 814                 /* Assumption: MDT_MD size is enough for lmv size. */
 815                 ma->ma_lmv = buffer->lb_buf;
 816                 ma->ma_lmv_size = buffer->lb_len;
 817                 ma->ma_need = MA_INODE;
 818                 if (ma->ma_lmv_size > 0) {
 819                         if (reqbody->valid & OBD_MD_MEA)
 820                                 ma->ma_need |= MA_LMV;
 821                         else if (reqbody->valid & OBD_MD_DEFAULT_MEA)
 822                                 ma->ma_need |= MA_LMV_DEF;
 823                 }
 824         } else {
 825                 ma->ma_lmm = buffer->lb_buf;
 826                 ma->ma_lmm_size = buffer->lb_len;
 827                 ma->ma_need = MA_INODE | MA_HSM;
 828                 if (ma->ma_lmm_size > 0)
 829                         ma->ma_need |= MA_LOV;
 830         }
 831
 832         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 833             reqbody->valid & OBD_MD_FLDIREA  &&
 834             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 835                 /* get default stripe info for this dir. */
 836                 ma->ma_need |= MA_LOV_DEF;
 837         }
 838         ma->ma_need |= ma_need;
 839         if (ma->ma_need & MA_SOM)
 840                 ma->ma_som = &info->mti_u.som.data;
 841
 842         rc = mdt_attr_get_complex(info, o, ma);
 843         if (unlikely(rc)) {
 844                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 845                        mdt_obd_name(info->mti_mdt),
 846                        PFID(mdt_object_fid(o)), rc);
 847                 RETURN(rc);
 848         }
 849
 850         /* if file is released, check if a restore is running */
 851         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
 852             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
 853                 repbody->t_state = MS_RESTORE;
 854                 repbody->valid |= OBD_MD_TSTATE;
 855         }
 856
 857         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 858
 859         /* the Lustre protocol supposes to return default striping
 860          * on the user-visible root if explicitly requested */
 861         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 862             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 863                 struct lu_fid      rootfid;
 864                 struct mdt_object *root;
 865                 struct mdt_device *mdt = info->mti_mdt;
 866
 867                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 868                 if (rc)
 869                         RETURN(rc);
 870                 root = mdt_object_find(env, mdt, &rootfid);
 871                 if (IS_ERR(root))
 872                         RETURN(PTR_ERR(root));
 873                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
 874                 mdt_object_put(info->mti_env, root);
 875                 if (unlikely(rc)) {
 876                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 877                                mdt_obd_name(info->mti_mdt),
 878                                PFID(mdt_object_fid(o)), rc);
 879                         RETURN(rc);
 880                 }
 881         }
 882
 883         if (likely(ma->ma_valid & MA_INODE))
 884                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 885         else
 886                 RETURN(-EFAULT);
 887
 888         if (mdt_body_has_lov(la, reqbody)) {
 889                 if (ma->ma_valid & MA_LOV) {
 890                         LASSERT(ma->ma_lmm_size);
 891                         repbody->eadatasize = ma->ma_lmm_size;
 892                         if (S_ISDIR(la->la_mode))
 893                                 repbody->valid |= OBD_MD_FLDIREA;
 894                         else
 895                                 repbody->valid |= OBD_MD_FLEASIZE;
 896                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->valid);
 897                 }
 898                 if (ma->ma_valid & MA_LMV) {
 899                         LASSERT(S_ISDIR(la->la_mode));
 900                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
 901                         repbody->eadatasize = ma->ma_lmv_size;
 902                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 903                 }
 904                 if (ma->ma_valid & MA_LMV_DEF) {
 905                         LASSERT(S_ISDIR(la->la_mode));
 906                         repbody->eadatasize = ma->ma_lmv_size;
 907                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_DEFAULT_MEA);
 908                 }
 909         } else if (S_ISLNK(la->la_mode) &&
 910                    reqbody->valid & OBD_MD_LINKNAME) {
 911                 buffer->lb_buf = ma->ma_lmm;
 912                 /* eadatasize from client includes NULL-terminator, so
 913                  * there is no need to read it */
 914                 buffer->lb_len = reqbody->eadatasize - 1;
 915                 rc = mo_readlink(env, next, buffer);
 916                 if (unlikely(rc <= 0)) {
 917                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 918                                mdt_obd_name(info->mti_mdt),
 919                                PFID(mdt_object_fid(o)), rc);
 920                         rc = -EFAULT;
 921                 } else {
 922                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 923
 924                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 925                                 rc -= 2;
 926                         repbody->valid |= OBD_MD_LINKNAME;
 927                         /* we need to report back size with NULL-terminator
 928                          * because client expects that */
 929                         repbody->eadatasize = rc + 1;
 930                         if (repbody->eadatasize != reqbody->eadatasize)
 931                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 932                                        "on "DFID ", expected %d\n",
 933                                        mdt_obd_name(info->mti_mdt),
 934                                        rc, PFID(mdt_object_fid(o)),
 935                                        reqbody->eadatasize - 1);
 936                         /* NULL terminate */
 937                         ((char *)ma->ma_lmm)[rc] = 0;
 938
 939                         /* If the total CDEBUG() size is larger than a page, it
 940                          * will print a warning to the console, avoid this by
 941                          * printing just the last part of the symlink. */
 942                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
 943                                print_limit < rc ? "..." : "", print_limit,
 944                                (char *)ma->ma_lmm + rc - print_limit, rc);
 945                         rc = 0;
 946                 }
 947         }
 948
 949         if (reqbody->valid & OBD_MD_FLMODEASIZE) {
 950                 repbody->max_cookiesize = 0;
 951                 repbody->max_mdsize = info->mti_mdt->mdt_max_mdsize;
 952                 repbody->valid |= OBD_MD_FLMODEASIZE;
 953                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
 954                        "MAX_COOKIE to : %d:%d\n", repbody->max_mdsize,
 955                        repbody->max_cookiesize);
 956         }
 957
 958         if (exp_connect_rmtclient(info->mti_exp) &&
 959             reqbody->valid & OBD_MD_FLRMTPERM) {
 960                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
 961
 962                 /* mdt_getattr_lock only */
 963                 rc = mdt_pack_remote_perm(info, o, buf);
 964                 if (rc) {
 965                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 966                         repbody->aclsize = 0;
 967                         RETURN(rc);
 968                 } else {
 969                         repbody->valid |= OBD_MD_FLRMTPERM;
 970                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 971                 }
 972         }
 973 #ifdef CONFIG_FS_POSIX_ACL
 974         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
 975                  (reqbody->valid & OBD_MD_FLACL)) {
 976                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 977                 buffer->lb_len = req_capsule_get_size(pill,
 978                                                       &RMF_ACL, RCL_SERVER);
 979                 if (buffer->lb_len > 0) {
 980                         rc = mo_xattr_get(env, next, buffer,
 981                                           XATTR_NAME_ACL_ACCESS);
 982                         if (rc < 0) {
 983                                 if (rc == -ENODATA) {
 984                                         repbody->aclsize = 0;
 985                                         repbody->valid |= OBD_MD_FLACL;
 986                                         rc = 0;
 987                                 } else if (rc == -EOPNOTSUPP) {
 988                                         rc = 0;
 989                                 } else {
 990                                         CERROR("%s: unable to read "DFID
 991                                                " ACL: rc = %d\n",
 992                                                mdt_obd_name(info->mti_mdt),
 993                                                PFID(mdt_object_fid(o)), rc);
 994                                 }
 995                         } else {
 996                                 repbody->aclsize = rc;
 997                                 repbody->valid |= OBD_MD_FLACL;
 998                                 rc = 0;
 999                         }
1000                 }
1001         }
1002 #endif
1003
1004         if (reqbody->valid & OBD_MD_FLMDSCAPA &&
1005             info->mti_mdt->mdt_lut.lut_mds_capa &&
1006             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
1007                 struct lustre_capa *capa;
1008
1009                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
1010                 LASSERT(capa);
1011                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
1012                 rc = mo_capa_get(env, next, capa, 0);
1013                 if (rc)
1014                         RETURN(rc);
1015                 repbody->valid |= OBD_MD_FLMDSCAPA;
1016         }
1017
1018 out:
1019         if (rc == 0)
1020                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1021
1022         RETURN(rc);
1023 }
1024
1025 static int mdt_renew_capa(struct mdt_thread_info *info)
1026 {
1027         struct mdt_object  *obj = info->mti_object;
1028         struct mdt_body    *body;
1029         struct lustre_capa *capa, *c;
1030         int rc;
1031         ENTRY;
1032
1033         /* if object doesn't exist, or server has disabled capability,
1034          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
1035          * flag not set.
1036          */
1037         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
1038             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
1039                 RETURN(0);
1040
1041         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1042         LASSERT(body != NULL);
1043
1044         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
1045         LASSERT(c);
1046
1047         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
1048         LASSERT(capa);
1049
1050         *capa = *c;
1051         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
1052         if (rc == 0)
1053                 body->valid |= OBD_MD_FLOSSCAPA;
1054         RETURN(rc);
1055 }
1056
1057 int mdt_getattr(struct tgt_session_info *tsi)
1058 {
1059         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1060         struct mdt_object       *obj = info->mti_object;
1061         struct req_capsule      *pill = info->mti_pill;
1062         struct mdt_body         *reqbody;
1063         struct mdt_body         *repbody;
1064         mode_t                   mode;
1065         int rc, rc2;
1066         ENTRY;
1067
1068         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1069         LASSERT(reqbody);
1070
1071         if (reqbody->valid & OBD_MD_FLOSSCAPA) {
1072                 rc = req_capsule_server_pack(pill);
1073                 if (unlikely(rc))
1074                         RETURN(err_serious(rc));
1075                 rc = mdt_renew_capa(info);
1076                 GOTO(out_shrink, rc);
1077         }
1078
1079         LASSERT(obj != NULL);
1080         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1081
1082         mode = lu_object_attr(&obj->mot_obj);
1083
1084         /* Readlink */
1085         if (reqbody->valid & OBD_MD_LINKNAME) {
1086                 /* No easy way to know how long is the symlink, but it cannot
1087                  * be more than PATH_MAX, so we allocate +1 */
1088                 rc = PATH_MAX + 1;
1089
1090         /* A special case for fs ROOT: getattr there might fetch
1091          * default EA for entire fs, not just for this dir!
1092          */
1093         } else if (lu_fid_eq(mdt_object_fid(obj),
1094                              &info->mti_mdt->mdt_md_root_fid) &&
1095                    (reqbody->valid & OBD_MD_FLDIREA) &&
1096                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1097                                                                  MDS_GETATTR)) {
1098                 /* Should the default strping be bigger, mdt_fix_reply
1099                  * will reallocate */
1100                 rc = DEF_REP_MD_SIZE;
1101         } else {
1102                 /* Hopefully no race in EA change for either file or directory?
1103                  */
1104                 rc = mdt_attr_get_eabuf_size(info, obj);
1105         }
1106
1107         if (rc < 0)
1108                 GOTO(out_shrink, rc);
1109
1110         /* old clients may not report needed easize, use max value then */
1111         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1112
1113         rc = req_capsule_server_pack(pill);
1114         if (unlikely(rc != 0))
1115                 GOTO(out, rc = err_serious(rc));
1116
1117         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1118         LASSERT(repbody != NULL);
1119         repbody->eadatasize = 0;
1120         repbody->aclsize = 0;
1121
1122         if (reqbody->valid & OBD_MD_FLRMTPERM)
1123                 rc = mdt_init_ucred(info, reqbody);
1124         else
1125                 rc = mdt_check_ucred(info);
1126         if (unlikely(rc))
1127                 GOTO(out_shrink, rc);
1128
1129         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1130
1131         /*
1132          * Don't check capability at all, because rename might getattr for
1133          * remote obj, and at that time no capability is available.
1134          */
1135         mdt_set_capainfo(info, 1, &reqbody->fid1, BYPASS_CAPA);
1136         rc = mdt_getattr_internal(info, obj, 0);
1137         if (reqbody->valid & OBD_MD_FLRMTPERM)
1138                 mdt_exit_ucred(info);
1139         EXIT;
1140 out_shrink:
1141         mdt_client_compatibility(info);
1142         rc2 = mdt_fix_reply(info);
1143         if (rc == 0)
1144                 rc = rc2;
1145 out:
1146         mdt_thread_info_fini(info);
1147         return rc;
1148 }
1149
1150 int mdt_is_subdir(struct tgt_session_info *tsi)
1151 {
1152         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1153         struct mdt_object     *o = info->mti_object;
1154         struct req_capsule    *pill = info->mti_pill;
1155         const struct mdt_body *body = info->mti_body;
1156         struct mdt_body       *repbody;
1157         int                    rc;
1158         ENTRY;
1159
1160         LASSERT(o != NULL);
1161
1162         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1163
1164         /*
1165          * We save last checked parent fid to @repbody->fid1 for remote
1166          * directory case.
1167          */
1168         LASSERT(fid_is_sane(&body->fid2));
1169         LASSERT(mdt_object_exists(o) && !mdt_object_remote(o));
1170         rc = mdo_is_subdir(info->mti_env, mdt_object_child(o),
1171                            &body->fid2, &repbody->fid1);
1172         if (rc == 0 || rc == -EREMOTE)
1173                 repbody->valid |= OBD_MD_FLID;
1174
1175         mdt_thread_info_fini(info);
1176         RETURN(rc);
1177 }
1178
1179 int mdt_swap_layouts(struct tgt_session_info *tsi)
1180 {
1181         struct mdt_thread_info  *info;
1182         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1183         struct obd_export       *exp = req->rq_export;
1184         struct mdt_object       *o1, *o2, *o;
1185         struct mdt_lock_handle  *lh1, *lh2;
1186         struct mdc_swap_layouts *msl;
1187         int                      rc;
1188         ENTRY;
1189
1190         /* client does not support layout lock, so layout swaping
1191          * is disabled.
1192          * FIXME: there is a problem for old clients which don't support
1193          * layout lock yet. If those clients have already opened the file
1194          * they won't be notified at all so that old layout may still be
1195          * used to do IO. This can be fixed after file release is landed by
1196          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1197         if (!exp_connect_layout(exp))
1198                 RETURN(-EOPNOTSUPP);
1199
1200         info = tsi2mdt_info(tsi);
1201
1202         if (info->mti_dlm_req != NULL)
1203                 ldlm_request_cancel(req, info->mti_dlm_req, 0);
1204
1205         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1206                 mdt_set_capainfo(info, 0, &info->mti_body->fid1,
1207                                  req_capsule_client_get(info->mti_pill,
1208                                                         &RMF_CAPA1));
1209
1210         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1211                 mdt_set_capainfo(info, 1, &info->mti_body->fid2,
1212                                  req_capsule_client_get(info->mti_pill,
1213                                                         &RMF_CAPA2));
1214
1215         o1 = info->mti_object;
1216         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1217                                 &info->mti_body->fid2);
1218         if (IS_ERR(o))
1219                 GOTO(out, rc = PTR_ERR(o));
1220
1221         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1222                 GOTO(put, rc = -ENOENT);
1223
1224         rc = lu_fid_cmp(&info->mti_body->fid1, &info->mti_body->fid2);
1225         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1226                 GOTO(put, rc);
1227
1228         if (rc < 0)
1229                 swap(o1, o2);
1230
1231         /* permission check. Make sure the calling process having permission
1232          * to write both files. */
1233         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1234                                 MAY_WRITE);
1235         if (rc < 0)
1236                 GOTO(put, rc);
1237
1238         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1239                                 MAY_WRITE);
1240         if (rc < 0)
1241                 GOTO(put, rc);
1242
1243         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1244         if (msl == NULL)
1245                 GOTO(put, rc = -EPROTO);
1246
1247         lh1 = &info->mti_lh[MDT_LH_NEW];
1248         mdt_lock_reg_init(lh1, LCK_EX);
1249         lh2 = &info->mti_lh[MDT_LH_OLD];
1250         mdt_lock_reg_init(lh2, LCK_EX);
1251
1252         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1253                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1254         if (rc < 0)
1255                 GOTO(put, rc);
1256
1257         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1258                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1259         if (rc < 0)
1260                 GOTO(unlock1, rc);
1261
1262         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1263                              mdt_object_child(o2), msl->msl_flags);
1264         GOTO(unlock2, rc);
1265 unlock2:
1266         mdt_object_unlock(info, o2, lh2, rc);
1267 unlock1:
1268         mdt_object_unlock(info, o1, lh1, rc);
1269 put:
1270         mdt_object_put(info->mti_env, o);
1271 out:
1272         mdt_thread_info_fini(info);
1273         RETURN(rc);
1274 }
1275
1276 static int mdt_raw_lookup(struct mdt_thread_info *info,
1277                           struct mdt_object *parent,
1278                           const struct lu_name *lname,
1279                           struct ldlm_reply *ldlm_rep)
1280 {
1281         struct md_object *next = mdt_object_child(info->mti_object);
1282         const struct mdt_body *reqbody = info->mti_body;
1283         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1284         struct mdt_body *repbody;
1285         int rc;
1286         ENTRY;
1287
1288         if (reqbody->valid != OBD_MD_FLID)
1289                 RETURN(0);
1290
1291         LASSERT(!info->mti_cross_ref);
1292
1293         /* Only got the fid of this obj by name */
1294         fid_zero(child_fid);
1295         rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1296                         &info->mti_spec);
1297 #if 0
1298         /* XXX is raw_lookup possible as intent operation? */
1299         if (rc != 0) {
1300                 if (rc == -ENOENT)
1301                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1302                 RETURN(rc);
1303         } else
1304                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1305
1306         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1307 #endif
1308         if (rc == 0) {
1309                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1310                 repbody->fid1 = *child_fid;
1311                 repbody->valid = OBD_MD_FLID;
1312         }
1313         RETURN(1);
1314 }
1315
1316 /*
1317  * UPDATE lock should be taken against parent, and be release before exit;
1318  * child_bits lock should be taken against child, and be returned back:
1319  *            (1)normal request should release the child lock;
1320  *            (2)intent request will grant the lock to client.
1321  */
1322 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1323                                  struct mdt_lock_handle *lhc,
1324                                  __u64 child_bits,
1325                                  struct ldlm_reply *ldlm_rep)
1326 {
1327         struct ptlrpc_request  *req       = mdt_info_req(info);
1328         struct mdt_body        *reqbody   = NULL;
1329         struct mdt_object      *parent    = info->mti_object;
1330         struct mdt_object      *child;
1331         struct md_object       *next      = mdt_object_child(parent);
1332         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1333         struct lu_name         *lname     = NULL;
1334         struct mdt_lock_handle *lhp       = NULL;
1335         struct ldlm_lock       *lock;
1336         struct ldlm_res_id     *res_id;
1337         int                     is_resent;
1338         int                     ma_need = 0;
1339         int                     rc;
1340
1341         ENTRY;
1342
1343         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1344         LASSERT(ergo(is_resent,
1345                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1346
1347         LASSERT(parent != NULL);
1348
1349         lname = &info->mti_name;
1350         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1351
1352         if (!info->mti_cross_ref) {
1353                 /*
1354                  * XXX: Check for anonymous name is for getattr by fid
1355                  * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
1356                  * that is the name must contain at least one character and
1357                  * the terminating '\0'.
1358                  */
1359                 if (!lu_name_is_valid(lname)) {
1360                         reqbody = req_capsule_client_get(info->mti_pill,
1361                                                          &RMF_MDT_BODY);
1362                         if (unlikely(reqbody == NULL))
1363                                 RETURN(err_serious(-EFAULT));
1364
1365                         if (unlikely(!fid_is_sane(&reqbody->fid2)))
1366                                 RETURN(err_serious(-EINVAL));
1367
1368                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1369                                "ldlm_rep = %p\n",
1370                                PFID(mdt_object_fid(parent)),
1371                                PFID(&reqbody->fid2), ldlm_rep);
1372                 } else {
1373                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1374                                "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1375                                PNAME(lname), ldlm_rep);
1376                 }
1377         }
1378
1379         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1380
1381         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1382                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1383                                 &parent->mot_obj,
1384                                 "Parent doesn't exist!\n");
1385                 RETURN(-ESTALE);
1386         } else if (!info->mti_cross_ref) {
1387                 LASSERTF(!mdt_object_remote(parent),
1388                          "Parent "DFID" is on remote server\n",
1389                          PFID(mdt_object_fid(parent)));
1390         }
1391
1392         if (lu_name_is_valid(lname)) {
1393                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1394                 if (rc != 0) {
1395                         if (rc > 0)
1396                                 rc = 0;
1397                         RETURN(rc);
1398                 }
1399         }
1400
1401         if (info->mti_cross_ref) {
1402                 /* Only getattr on the child. Parent is on another node. */
1403                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1404                 child = parent;
1405                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1406                        "ldlm_rep=%p\n", PFID(mdt_object_fid(child)), ldlm_rep);
1407
1408                 if (is_resent) {
1409                         /* Do not take lock for resent case. */
1410                         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1411                         LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1412                                  lhc->mlh_reg_lh.cookie);
1413                         LASSERT(fid_res_name_eq(mdt_object_fid(child),
1414                                                 &lock->l_resource->lr_name));
1415                         LDLM_LOCK_PUT(lock);
1416                         rc = 0;
1417                 } else {
1418                         mdt_lock_handle_init(lhc);
1419                         mdt_lock_reg_init(lhc, LCK_PR);
1420
1421                         /*
1422                          * Object's name is on another MDS, no lookup or layout
1423                          * lock is needed here but update lock is.
1424                          */
1425                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1426                                         MDS_INODELOCK_LAYOUT);
1427                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1428
1429                         rc = mdt_object_lock(info, child, lhc, child_bits,
1430                                              MDT_LOCAL_LOCK);
1431                 }
1432                 if (rc == 0) {
1433                         /* Finally, we can get attr for child. */
1434                         if (!mdt_object_exists(child)) {
1435                                 LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1436                                                 &child->mot_obj,
1437                                              "remote object doesn't exist.\n");
1438                                 mdt_object_unlock(info, child, lhc, 1);
1439                                 RETURN(-ENOENT);
1440                         }
1441
1442                         mdt_set_capainfo(info, 0, mdt_object_fid(child),
1443                                          BYPASS_CAPA);
1444                         rc = mdt_getattr_internal(info, child, 0);
1445                         if (unlikely(rc != 0))
1446                                 mdt_object_unlock(info, child, lhc, 1);
1447                 }
1448                 RETURN(rc);
1449         }
1450
1451         if (lu_name_is_valid(lname)) {
1452                 /* step 1: lock parent only if parent is a directory */
1453                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1454                         lhp = &info->mti_lh[MDT_LH_PARENT];
1455                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1456                         rc = mdt_object_lock(info, parent, lhp,
1457                                              MDS_INODELOCK_UPDATE,
1458                                              MDT_LOCAL_LOCK);
1459                         if (unlikely(rc != 0))
1460                                 RETURN(rc);
1461                 }
1462
1463                 /* step 2: lookup child's fid by name */
1464                 fid_zero(child_fid);
1465                 rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1466                                 &info->mti_spec);
1467
1468                 if (rc != 0) {
1469                         if (rc == -ENOENT)
1470                                 mdt_set_disposition(info, ldlm_rep,
1471                                                     DISP_LOOKUP_NEG);
1472                         GOTO(out_parent, rc);
1473                 } else
1474                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1475         } else {
1476                 *child_fid = reqbody->fid2;
1477                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1478         }
1479
1480         /*
1481          *step 3: find the child object by fid & lock it.
1482          *        regardless if it is local or remote.
1483          *
1484          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1485          *      set parent dir fid the same as child fid in getattr by fid case
1486          *      we should not lu_object_find() the object again, could lead
1487          *      to hung if there is a concurrent unlink destroyed the object.
1488          */
1489         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1490                 mdt_object_get(info->mti_env, parent);
1491                 child = parent;
1492         } else {
1493                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1494                                         child_fid);
1495         }
1496
1497         if (unlikely(IS_ERR(child)))
1498                 GOTO(out_parent, rc = PTR_ERR(child));
1499         if (is_resent) {
1500                 /* Do not take lock for resent case. */
1501                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1502                 LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1503                          lhc->mlh_reg_lh.cookie);
1504
1505                 res_id = &lock->l_resource->lr_name;
1506                 if (!fid_res_name_eq(mdt_object_fid(child),
1507                                      &lock->l_resource->lr_name)) {
1508                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
1509                                                  &lock->l_resource->lr_name),
1510                                  "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1511                                  PLDLMRES(lock->l_resource),
1512                                  PFID(mdt_object_fid(parent)));
1513                         CWARN("Although resent, but still not get child lock"
1514                               "parent:"DFID" child:"DFID"\n",
1515                               PFID(mdt_object_fid(parent)),
1516                               PFID(mdt_object_fid(child)));
1517                         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1518                         LDLM_LOCK_PUT(lock);
1519                         GOTO(relock, 0);
1520                 }
1521                 LDLM_LOCK_PUT(lock);
1522                 rc = 0;
1523         } else {
1524                 bool try_layout = false;
1525
1526 relock:
1527                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1528                 mdt_lock_handle_init(lhc);
1529                 mdt_lock_reg_init(lhc, LCK_PR);
1530
1531                 if (!mdt_object_exists(child)) {
1532                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1533                                         &child->mot_obj,
1534                                         "Object doesn't exist!\n");
1535                         GOTO(out_child, rc = -ENOENT);
1536                 }
1537
1538                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1539                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1540                         struct md_attr *ma = &info->mti_attr;
1541
1542                         ma->ma_valid = 0;
1543                         ma->ma_need = MA_INODE;
1544                         rc = mdt_attr_get_complex(info, child, ma);
1545                         if (unlikely(rc != 0))
1546                                 GOTO(out_child, rc);
1547
1548                         /* If the file has not been changed for some time, we
1549                          * return not only a LOOKUP lock, but also an UPDATE
1550                          * lock and this might save us RPC on later STAT. For
1551                          * directories, it also let negative dentry cache start
1552                          * working for this dir. */
1553                         if (ma->ma_valid & MA_INODE &&
1554                             ma->ma_attr.la_valid & LA_CTIME &&
1555                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1556                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1557                                 child_bits |= MDS_INODELOCK_UPDATE;
1558                 }
1559
1560                 /* layout lock must be granted in a best-effort way
1561                  * for IT operations */
1562                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1563                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1564                     exp_connect_layout(info->mti_exp) &&
1565                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1566                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1567                         /* try to grant layout lock for regular file. */
1568                         try_layout = true;
1569                 }
1570
1571                 rc = 0;
1572                 if (try_layout) {
1573                         child_bits |= MDS_INODELOCK_LAYOUT;
1574                         /* try layout lock, it may fail to be granted due to
1575                          * contention at LOOKUP or UPDATE */
1576                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1577                                                  MDT_CROSS_LOCK)) {
1578                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1579                                 LASSERT(child_bits != 0);
1580                                 rc = mdt_object_lock(info, child, lhc,
1581                                                 child_bits, MDT_CROSS_LOCK);
1582                         } else {
1583                                 ma_need |= MA_LOV;
1584                         }
1585                 } else {
1586                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1587                          * client will enqueue the lock to the remote MDT */
1588                         if (mdt_object_remote(child))
1589                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1590                         rc = mdt_object_lock(info, child, lhc, child_bits,
1591                                                 MDT_CROSS_LOCK);
1592                 }
1593                 if (unlikely(rc != 0))
1594                         GOTO(out_child, rc);
1595         }
1596
1597         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1598         /* Get MA_SOM attributes if update lock is given. */
1599         if (lock &&
1600             lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_UPDATE &&
1601             S_ISREG(lu_object_attr(&mdt_object_child(child)->mo_lu)))
1602                 ma_need |= MA_SOM;
1603
1604         /* finally, we can get attr for child. */
1605         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1606         rc = mdt_getattr_internal(info, child, ma_need);
1607         if (unlikely(rc != 0)) {
1608                 mdt_object_unlock(info, child, lhc, 1);
1609         } else if (lock) {
1610                 /* Debugging code. */
1611                 res_id = &lock->l_resource->lr_name;
1612                 LDLM_DEBUG(lock, "Returning lock to client");
1613                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1614                                          &lock->l_resource->lr_name),
1615                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1616                          PLDLMRES(lock->l_resource),
1617                          PFID(mdt_object_fid(child)));
1618                 if (mdt_object_exists(child) && !mdt_object_remote(child))
1619                         mdt_pack_size2body(info, child);
1620         }
1621         if (lock)
1622                 LDLM_LOCK_PUT(lock);
1623
1624         EXIT;
1625 out_child:
1626         mdt_object_put(info->mti_env, child);
1627 out_parent:
1628         if (lhp)
1629                 mdt_object_unlock(info, parent, lhp, 1);
1630         return rc;
1631 }
1632
1633 /* normal handler: should release the child lock */
1634 int mdt_getattr_name(struct tgt_session_info *tsi)
1635 {
1636         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1637         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1638         struct mdt_body        *reqbody;
1639         struct mdt_body        *repbody;
1640         int rc, rc2;
1641         ENTRY;
1642
1643         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1644         LASSERT(reqbody != NULL);
1645         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1646         LASSERT(repbody != NULL);
1647
1648         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1649         repbody->eadatasize = 0;
1650         repbody->aclsize = 0;
1651
1652         rc = mdt_init_ucred(info, reqbody);
1653         if (unlikely(rc))
1654                 GOTO(out_shrink, rc);
1655
1656         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1657         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1658                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1659                 lhc->mlh_reg_lh.cookie = 0;
1660         }
1661         mdt_exit_ucred(info);
1662         EXIT;
1663 out_shrink:
1664         mdt_client_compatibility(info);
1665         rc2 = mdt_fix_reply(info);
1666         if (rc == 0)
1667                 rc = rc2;
1668         mdt_thread_info_fini(info);
1669         return rc;
1670 }
1671
1672 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1673                          void *karg, void *uarg);
1674
1675 int mdt_set_info(struct tgt_session_info *tsi)
1676 {
1677         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1678         char                    *key;
1679         void                    *val;
1680         int                      keylen, vallen, rc = 0;
1681
1682         ENTRY;
1683
1684         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1685         if (key == NULL) {
1686                 DEBUG_REQ(D_HA, req, "no set_info key");
1687                 RETURN(err_serious(-EFAULT));
1688         }
1689
1690         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1691                                       RCL_CLIENT);
1692
1693         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1694         if (val == NULL) {
1695                 DEBUG_REQ(D_HA, req, "no set_info val");
1696                 RETURN(err_serious(-EFAULT));
1697         }
1698
1699         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1700                                       RCL_CLIENT);
1701
1702         /* Swab any part of val you need to here */
1703         if (KEY_IS(KEY_READ_ONLY)) {
1704                 spin_lock(&req->rq_export->exp_lock);
1705                 if (*(__u32 *)val)
1706                         *exp_connect_flags_ptr(req->rq_export) |=
1707                                 OBD_CONNECT_RDONLY;
1708                 else
1709                         *exp_connect_flags_ptr(req->rq_export) &=
1710                                 ~OBD_CONNECT_RDONLY;
1711                 spin_unlock(&req->rq_export->exp_lock);
1712         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1713                 struct changelog_setinfo *cs = val;
1714
1715                 if (vallen != sizeof(*cs)) {
1716                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1717                                tgt_name(tsi->tsi_tgt), vallen);
1718                         RETURN(-EINVAL);
1719                 }
1720                 if (ptlrpc_req_need_swab(req)) {
1721                         __swab64s(&cs->cs_recno);
1722                         __swab32s(&cs->cs_id);
1723                 }
1724
1725                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1726                                    vallen, val, NULL);
1727         } else {
1728                 RETURN(-EINVAL);
1729         }
1730         RETURN(rc);
1731 }
1732
1733 int mdt_readpage(struct tgt_session_info *tsi)
1734 {
1735         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1736         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1737         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1738         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1739         struct mdt_body         *repbody;
1740         int                      rc;
1741         int                      i;
1742
1743         ENTRY;
1744
1745         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1746                 RETURN(err_serious(-ENOMEM));
1747
1748         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1749         if (repbody == NULL || reqbody == NULL)
1750                 RETURN(err_serious(-EFAULT));
1751
1752         /*
1753          * prepare @rdpg before calling lower layers and transfer itself. Here
1754          * reqbody->size contains offset of where to start to read and
1755          * reqbody->nlink contains number bytes to read.
1756          */
1757         rdpg->rp_hash = reqbody->size;
1758         if (rdpg->rp_hash != reqbody->size) {
1759                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1760                        rdpg->rp_hash, reqbody->size);
1761                 RETURN(-EFAULT);
1762         }
1763
1764         rdpg->rp_attrs = reqbody->mode;
1765         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1766                 rdpg->rp_attrs |= LUDA_64BITHASH;
1767         rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
1768                                 exp_max_brw_size(tsi->tsi_exp));
1769         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1770                           PAGE_CACHE_SHIFT;
1771         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1772         if (rdpg->rp_pages == NULL)
1773                 RETURN(-ENOMEM);
1774
1775         for (i = 0; i < rdpg->rp_npages; ++i) {
1776                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1777                 if (rdpg->rp_pages[i] == NULL)
1778                         GOTO(free_rdpg, rc = -ENOMEM);
1779         }
1780
1781         /* call lower layers to fill allocated pages with directory data */
1782         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1783         if (rc < 0)
1784                 GOTO(free_rdpg, rc);
1785
1786         /* send pages to client */
1787         rc = tgt_sendpage(tsi, rdpg, rc);
1788
1789         EXIT;
1790 free_rdpg:
1791
1792         for (i = 0; i < rdpg->rp_npages; i++)
1793                 if (rdpg->rp_pages[i] != NULL)
1794                         __free_page(rdpg->rp_pages[i]);
1795         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1796
1797         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1798                 RETURN(0);
1799
1800         return rc;
1801 }
1802
1803 static int mdt_reint_internal(struct mdt_thread_info *info,
1804                               struct mdt_lock_handle *lhc,
1805                               __u32 op)
1806 {
1807         struct req_capsule      *pill = info->mti_pill;
1808         struct mdt_body         *repbody;
1809         int                      rc = 0, rc2;
1810
1811         ENTRY;
1812
1813         rc = mdt_reint_unpack(info, op);
1814         if (rc != 0) {
1815                 CERROR("Can't unpack reint, rc %d\n", rc);
1816                 RETURN(err_serious(rc));
1817         }
1818
1819         /* for replay (no_create) lmm is not needed, client has it already */
1820         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1821                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1822                                      DEF_REP_MD_SIZE);
1823
1824         /* llog cookies are always 0, the field is kept for compatibility */
1825         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1826                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1827
1828         rc = req_capsule_server_pack(pill);
1829         if (rc != 0) {
1830                 CERROR("Can't pack response, rc %d\n", rc);
1831                 RETURN(err_serious(rc));
1832         }
1833
1834         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1835                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1836                 LASSERT(repbody);
1837                 repbody->eadatasize = 0;
1838                 repbody->aclsize = 0;
1839         }
1840
1841         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1842
1843         /* for replay no cookkie / lmm need, because client have this already */
1844         if (info->mti_spec.no_create)
1845                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1846                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1847
1848         rc = mdt_init_ucred_reint(info);
1849         if (rc)
1850                 GOTO(out_shrink, rc);
1851
1852         rc = mdt_fix_attr_ucred(info, op);
1853         if (rc != 0)
1854                 GOTO(out_ucred, rc = err_serious(rc));
1855
1856         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1857                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1858                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1859                 GOTO(out_ucred, rc);
1860         }
1861         rc = mdt_reint_rec(info, lhc);
1862         EXIT;
1863 out_ucred:
1864         mdt_exit_ucred(info);
1865 out_shrink:
1866         mdt_client_compatibility(info);
1867         rc2 = mdt_fix_reply(info);
1868         if (rc == 0)
1869                 rc = rc2;
1870         return rc;
1871 }
1872
1873 static long mdt_reint_opcode(struct ptlrpc_request *req,
1874                              const struct req_format **fmt)
1875 {
1876         struct mdt_device       *mdt;
1877         struct mdt_rec_reint    *rec;
1878         long                     opc;
1879
1880         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1881         if (rec != NULL) {
1882                 opc = rec->rr_opcode;
1883                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1884                 if (opc < REINT_MAX && fmt[opc] != NULL)
1885                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1886                 else {
1887                         mdt = mdt_exp2dev(req->rq_export);
1888                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1889                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1890                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1891                         opc = err_serious(-EFAULT);
1892                 }
1893         } else {
1894                 opc = err_serious(-EFAULT);
1895         }
1896         return opc;
1897 }
1898
1899 int mdt_reint(struct tgt_session_info *tsi)
1900 {
1901         long opc;
1902         int  rc;
1903         static const struct req_format *reint_fmts[REINT_MAX] = {
1904                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1905                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1906                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1907                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1908                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1909                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1910                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1911                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1912                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1913         };
1914
1915         ENTRY;
1916
1917         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1918         if (opc >= 0) {
1919                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1920                 /*
1921                  * No lock possible here from client to pass it to reint code
1922                  * path.
1923                  */
1924                 rc = mdt_reint_internal(info, NULL, opc);
1925                 mdt_thread_info_fini(info);
1926         } else {
1927                 rc = opc;
1928         }
1929
1930         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1931         RETURN(rc);
1932 }
1933
1934 /* this should sync the whole device */
1935 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1936 {
1937         struct dt_device *dt = mdt->mdt_bottom;
1938         int rc;
1939         ENTRY;
1940
1941         rc = dt->dd_ops->dt_sync(env, dt);
1942         RETURN(rc);
1943 }
1944
1945 /* this should sync this object */
1946 static int mdt_object_sync(struct mdt_thread_info *info)
1947 {
1948         struct md_object *next;
1949         int rc;
1950         ENTRY;
1951
1952         if (!mdt_object_exists(info->mti_object)) {
1953                 CWARN("Non existing object  "DFID"!\n",
1954                       PFID(mdt_object_fid(info->mti_object)));
1955                 RETURN(-ESTALE);
1956         }
1957         next = mdt_object_child(info->mti_object);
1958         rc = mo_object_sync(info->mti_env, next);
1959
1960         RETURN(rc);
1961 }
1962
1963 int mdt_sync(struct tgt_session_info *tsi)
1964 {
1965         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1966         struct req_capsule      *pill = tsi->tsi_pill;
1967         struct mdt_body         *body;
1968         int                      rc;
1969
1970         ENTRY;
1971
1972         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1973                 RETURN(err_serious(-ENOMEM));
1974
1975         if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
1976                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1977         } else {
1978                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1979
1980                 /* sync an object */
1981                 rc = mdt_object_sync(info);
1982                 if (rc == 0) {
1983                         const struct lu_fid *fid;
1984                         struct lu_attr *la = &info->mti_attr.ma_attr;
1985
1986                         info->mti_attr.ma_need = MA_INODE;
1987                         info->mti_attr.ma_valid = 0;
1988                         rc = mdt_attr_get_complex(info, info->mti_object,
1989                                                   &info->mti_attr);
1990                         if (rc == 0) {
1991                                 body = req_capsule_server_get(pill,
1992                                                               &RMF_MDT_BODY);
1993                                 fid = mdt_object_fid(info->mti_object);
1994                                 mdt_pack_attr2body(info, body, la, fid);
1995                         }
1996                 }
1997                 mdt_thread_info_fini(info);
1998         }
1999         if (rc == 0)
2000                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2001
2002         RETURN(rc);
2003 }
2004
2005 /*
2006  * Handle quota control requests to consult current usage/limit, but also
2007  * to configure quota enforcement
2008  */
2009 int mdt_quotactl(struct tgt_session_info *tsi)
2010 {
2011         struct obd_export       *exp  = tsi->tsi_exp;
2012         struct req_capsule      *pill = tsi->tsi_pill;
2013         struct obd_quotactl     *oqctl, *repoqc;
2014         int                      id, rc;
2015         struct mdt_device       *mdt = mdt_exp2dev(exp);
2016         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2017         ENTRY;
2018
2019         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2020         if (oqctl == NULL)
2021                 RETURN(err_serious(-EPROTO));
2022
2023         rc = req_capsule_server_pack(pill);
2024         if (rc)
2025                 RETURN(err_serious(rc));
2026
2027         switch (oqctl->qc_cmd) {
2028         case Q_QUOTACHECK:
2029         case LUSTRE_Q_INVALIDATE:
2030         case LUSTRE_Q_FINVALIDATE:
2031         case Q_QUOTAON:
2032         case Q_QUOTAOFF:
2033         case Q_INITQUOTA:
2034                 /* deprecated, not used any more */
2035                 RETURN(-EOPNOTSUPP);
2036                 /* master quotactl */
2037         case Q_GETINFO:
2038         case Q_SETINFO:
2039         case Q_SETQUOTA:
2040         case Q_GETQUOTA:
2041                 if (qmt == NULL)
2042                         RETURN(-EOPNOTSUPP);
2043                 /* slave quotactl */
2044         case Q_GETOINFO:
2045         case Q_GETOQUOTA:
2046                 break;
2047         default:
2048                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2049                 RETURN(-EFAULT);
2050         }
2051
2052         /* map uid/gid for remote client */
2053         id = oqctl->qc_id;
2054         if (exp_connect_rmtclient(exp)) {
2055                 struct lustre_idmap_table *idmap;
2056
2057                 idmap = exp->exp_mdt_data.med_idmap;
2058
2059                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2060                              oqctl->qc_cmd != Q_GETINFO))
2061                         RETURN(-EPERM);
2062
2063                 if (oqctl->qc_type == USRQUOTA)
2064                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2065                                                      oqctl->qc_id);
2066                 else if (oqctl->qc_type == GRPQUOTA)
2067                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2068                                                      oqctl->qc_id);
2069                 else
2070                         RETURN(-EINVAL);
2071
2072                 if (id == CFS_IDMAP_NOTFOUND) {
2073                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2074                         RETURN(-EACCES);
2075                 }
2076         }
2077
2078         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2079         if (repoqc == NULL)
2080                 RETURN(err_serious(-EFAULT));
2081
2082         if (oqctl->qc_id != id)
2083                 swap(oqctl->qc_id, id);
2084
2085         switch (oqctl->qc_cmd) {
2086
2087         case Q_GETINFO:
2088         case Q_SETINFO:
2089         case Q_SETQUOTA:
2090         case Q_GETQUOTA:
2091                 /* forward quotactl request to QMT */
2092                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2093                 break;
2094
2095         case Q_GETOINFO:
2096         case Q_GETOQUOTA:
2097                 /* slave quotactl */
2098                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2099                                    oqctl);
2100                 break;
2101
2102         default:
2103                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2104                 RETURN(-EFAULT);
2105         }
2106
2107         if (oqctl->qc_id != id)
2108                 swap(oqctl->qc_id, id);
2109
2110         *repoqc = *oqctl;
2111         RETURN(rc);
2112 }
2113
2114 /** clone llog ctxt from child (mdd)
2115  * This allows remote llog (replicator) access.
2116  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2117  * context was originally set up, or we can handle them directly.
2118  * I choose the latter, but that means I need any llog
2119  * contexts set up by child to be accessable by the mdt.  So we clone the
2120  * context into our context list here.
2121  */
2122 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2123                                int idx)
2124 {
2125         struct md_device  *next = mdt->mdt_child;
2126         struct llog_ctxt *ctxt;
2127         int rc;
2128
2129         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2130                 return 0;
2131
2132         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2133         if (rc || ctxt == NULL) {
2134                 return 0;
2135         }
2136
2137         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2138         if (rc)
2139                 CERROR("Can't set mdt ctxt %d\n", rc);
2140
2141         return rc;
2142 }
2143
2144 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2145                                  struct mdt_device *mdt, int idx)
2146 {
2147         struct llog_ctxt *ctxt;
2148
2149         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2150         if (ctxt == NULL)
2151                 return 0;
2152         /* Put once for the get we just did, and once for the clone */
2153         llog_ctxt_put(ctxt);
2154         llog_ctxt_put(ctxt);
2155         return 0;
2156 }
2157
2158 /*
2159  * sec context handlers
2160  */
2161 int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2162 {
2163         int rc;
2164
2165         rc = mdt_handle_idmap(tsi);
2166         if (unlikely(rc)) {
2167                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2168                 __u32                    opc;
2169
2170                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2171                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2172                         sptlrpc_svc_ctx_invalidate(req);
2173         }
2174
2175         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2176
2177         return rc;
2178 }
2179
2180 /*
2181  * quota request handlers
2182  */
2183 int mdt_quota_dqacq(struct tgt_session_info *tsi)
2184 {
2185         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2186         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2187         int                      rc;
2188         ENTRY;
2189
2190         if (qmt == NULL)
2191                 RETURN(err_serious(-EOPNOTSUPP));
2192
2193         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2194         RETURN(rc);
2195 }
2196
2197 struct mdt_object *mdt_object_new(const struct lu_env *env,
2198                                   struct mdt_device *d,
2199                                   const struct lu_fid *f)
2200 {
2201         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2202         struct lu_object *o;
2203         struct mdt_object *m;
2204         ENTRY;
2205
2206         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2207         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2208         if (unlikely(IS_ERR(o)))
2209                 m = (struct mdt_object *)o;
2210         else
2211                 m = mdt_obj(o);
2212         RETURN(m);
2213 }
2214
2215 struct mdt_object *mdt_object_find(const struct lu_env *env,
2216                                    struct mdt_device *d,
2217                                    const struct lu_fid *f)
2218 {
2219         struct lu_object *o;
2220         struct mdt_object *m;
2221         ENTRY;
2222
2223         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2224         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2225         if (unlikely(IS_ERR(o)))
2226                 m = (struct mdt_object *)o;
2227         else
2228                 m = mdt_obj(o);
2229
2230         RETURN(m);
2231 }
2232
2233 /**
2234  * Asyncronous commit for mdt device.
2235  *
2236  * Pass asynchonous commit call down the MDS stack.
2237  *
2238  * \param env environment
2239  * \param mdt the mdt device
2240  */
2241 static void mdt_device_commit_async(const struct lu_env *env,
2242                                     struct mdt_device *mdt)
2243 {
2244         struct dt_device *dt = mdt->mdt_bottom;
2245         int rc;
2246
2247         rc = dt->dd_ops->dt_commit_async(env, dt);
2248         if (unlikely(rc != 0))
2249                 CWARN("async commit start failed with rc = %d", rc);
2250 }
2251
2252 /**
2253  * Mark the lock as "synchonous".
2254  *
2255  * Mark the lock to deffer transaction commit to the unlock time.
2256  *
2257  * \param lock the lock to mark as "synchonous"
2258  *
2259  * \see mdt_is_lock_sync
2260  * \see mdt_save_lock
2261  */
2262 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2263 {
2264         lock->l_ast_data = (void*)1;
2265 }
2266
2267 /**
2268  * Check whehter the lock "synchonous" or not.
2269  *
2270  * \param lock the lock to check
2271  * \retval 1 the lock is "synchonous"
2272  * \retval 0 the lock isn't "synchronous"
2273  *
2274  * \see mdt_set_lock_sync
2275  * \see mdt_save_lock
2276  */
2277 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2278 {
2279         return lock->l_ast_data != NULL;
2280 }
2281
2282 /**
2283  * Blocking AST for mdt locks.
2284  *
2285  * Starts transaction commit if in case of COS lock conflict or
2286  * deffers such a commit to the mdt_save_lock.
2287  *
2288  * \param lock the lock which blocks a request or cancelling lock
2289  * \param desc unused
2290  * \param data unused
2291  * \param flag indicates whether this cancelling or blocking callback
2292  * \retval 0
2293  * \see ldlm_blocking_ast_nocheck
2294  */
2295 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2296                      void *data, int flag)
2297 {
2298         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2299         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2300         int rc;
2301         ENTRY;
2302
2303         if (flag == LDLM_CB_CANCELING)
2304                 RETURN(0);
2305         lock_res_and_lock(lock);
2306         if (lock->l_blocking_ast != mdt_blocking_ast) {
2307                 unlock_res_and_lock(lock);
2308                 RETURN(0);
2309         }
2310         if (mdt_cos_is_enabled(mdt) &&
2311             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2312             lock->l_blocking_lock != NULL &&
2313             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2314                 mdt_set_lock_sync(lock);
2315         }
2316         rc = ldlm_blocking_ast_nocheck(lock);
2317
2318         /* There is no lock conflict if l_blocking_lock == NULL,
2319          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2320          * when the last reference to a local lock was released */
2321         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2322                 struct lu_env env;
2323
2324                 rc = lu_env_init(&env, LCT_LOCAL);
2325                 if (unlikely(rc != 0))
2326                         CWARN("lu_env initialization failed with rc = %d,"
2327                               "cannot start asynchronous commit\n", rc);
2328                 else
2329                         mdt_device_commit_async(&env, mdt);
2330                 lu_env_fini(&env);
2331         }
2332         RETURN(rc);
2333 }
2334
2335 /* Used for cross-MDT lock */
2336 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2337                             void *data, int flag)
2338 {
2339         struct lustre_handle lockh;
2340         int               rc;
2341
2342         switch (flag) {
2343         case LDLM_CB_BLOCKING:
2344                 ldlm_lock2handle(lock, &lockh);
2345                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2346                 if (rc < 0) {
2347                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2348                         RETURN(rc);
2349                 }
2350                 break;
2351         case LDLM_CB_CANCELING:
2352                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2353                 break;
2354         default:
2355                 LBUG();
2356         }
2357         RETURN(0);
2358 }
2359
2360 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2361                            struct mdt_object *o, const struct lu_fid *fid,
2362                            struct lustre_handle *lh, ldlm_mode_t mode,
2363                            __u64 ibits)
2364 {
2365         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2366         ldlm_policy_data_t *policy = &mti->mti_policy;
2367         struct ldlm_res_id *res_id = &mti->mti_res_id;
2368         int rc = 0;
2369         ENTRY;
2370
2371         LASSERT(mdt_object_remote(o));
2372
2373         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2374
2375         fid_build_reg_res_name(fid, res_id);
2376
2377         memset(einfo, 0, sizeof(*einfo));
2378         einfo->ei_type = LDLM_IBITS;
2379         einfo->ei_mode = mode;
2380         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2381         einfo->ei_cb_cp = ldlm_completion_ast;
2382         einfo->ei_enq_slave = 0;
2383         einfo->ei_res_id = res_id;
2384
2385         memset(policy, 0, sizeof(*policy));
2386         policy->l_inodebits.bits = ibits;
2387
2388         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2389                             policy);
2390         RETURN(rc);
2391 }
2392
2393 static int mdt_object_local_lock(struct mdt_thread_info *info,
2394                                  struct mdt_object *o,
2395                                  struct mdt_lock_handle *lh, __u64 ibits,
2396                                  bool nonblock, int locality)
2397 {
2398         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2399         ldlm_policy_data_t *policy = &info->mti_policy;
2400         struct ldlm_res_id *res_id = &info->mti_res_id;
2401         __u64 dlmflags;
2402         int rc;
2403         ENTRY;
2404
2405         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2406         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2407         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2408         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2409
2410         /* Only enqueue LOOKUP lock for remote object */
2411         if (mdt_object_remote(o))
2412                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2413
2414         if (lh->mlh_type == MDT_PDO_LOCK) {
2415                 /* check for exists after object is locked */
2416                 if (mdt_object_exists(o) == 0) {
2417                         /* Non-existent object shouldn't have PDO lock */
2418                         RETURN(-ESTALE);
2419                 } else {
2420                         /* Non-dir object shouldn't have PDO lock */
2421                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2422                                 RETURN(-ENOTDIR);
2423                 }
2424         }
2425
2426         memset(policy, 0, sizeof(*policy));
2427         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2428
2429         dlmflags = LDLM_FL_ATOMIC_CB;
2430         if (nonblock)
2431                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2432
2433         /*
2434          * Take PDO lock on whole directory and build correct @res_id for lock
2435          * on part of directory.
2436          */
2437         if (lh->mlh_pdo_hash != 0) {
2438                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2439                 mdt_lock_pdo_mode(info, o, lh);
2440                 if (lh->mlh_pdo_mode != LCK_NL) {
2441                         /*
2442                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2443                          * is never going to be sent to client and we do not
2444                          * want it slowed down due to possible cancels.
2445                          */
2446                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2447                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2448                                           policy, res_id, dlmflags,
2449                                           info->mti_exp == NULL ? NULL :
2450                                           &info->mti_exp->exp_handle.h_cookie);
2451                         if (unlikely(rc))
2452                                 RETURN(rc);
2453                 }
2454
2455                 /*
2456                  * Finish res_id initializing by name hash marking part of
2457                  * directory which is taking modification.
2458                  */
2459                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2460         }
2461
2462         policy->l_inodebits.bits = ibits;
2463
2464         /*
2465          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2466          * going to be sent to client. If it is - mdt_intent_policy() path will
2467          * fix it up and turn FL_LOCAL flag off.
2468          */
2469         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2470                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2471                           info->mti_exp == NULL ? NULL :
2472                           &info->mti_exp->exp_handle.h_cookie);
2473         if (rc)
2474                 mdt_object_unlock(info, o, lh, 1);
2475         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2476                  lh->mlh_pdo_hash != 0 &&
2477                  (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX)) {
2478                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2479         }
2480
2481         RETURN(rc);
2482 }
2483
2484 int mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2485                              struct mdt_lock_handle *lh, __u64 ibits,
2486                              bool nonblock, int locality)
2487 {
2488         int rc;
2489         ENTRY;
2490
2491         if (!mdt_object_remote(o))
2492                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2493                                              locality);
2494
2495         if (locality == MDT_LOCAL_LOCK) {
2496                 CERROR("%s: try to get local lock for remote object"
2497                        DFID".\n", mdt_obd_name(info->mti_mdt),
2498                        PFID(mdt_object_fid(o)));
2499                 RETURN(-EPROTO);
2500         }
2501
2502         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2503         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2504                    MDS_INODELOCK_XATTR);
2505         if (ibits & MDS_INODELOCK_UPDATE) {
2506                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2507                  * enqueue RPC can only request 1 lock, to avoid extra
2508                  * RPC, so it will instead enqueue EX lock for remote
2509                  * object anyway XXX*/
2510                 if (lh->mlh_type == MDT_PDO_LOCK &&
2511                     lh->mlh_pdo_hash != 0) {
2512                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2513                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2514                                PFID(mdt_object_fid(o)));
2515                         lh->mlh_pdo_hash = 0;
2516                         lh->mlh_rreg_mode = LCK_EX;
2517                         lh->mlh_type = MDT_REG_LOCK;
2518                 }
2519                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2520                                             &lh->mlh_rreg_lh,
2521                                             lh->mlh_rreg_mode,
2522                                             MDS_INODELOCK_UPDATE);
2523                 if (rc != ELDLM_OK)
2524                         RETURN(rc);
2525         }
2526
2527         /* Only enqueue LOOKUP lock for remote object */
2528         if (ibits & MDS_INODELOCK_LOOKUP) {
2529                 rc = mdt_object_local_lock(info, o, lh,
2530                                            MDS_INODELOCK_LOOKUP,
2531                                            nonblock, locality);
2532                 if (rc != ELDLM_OK)
2533                         RETURN(rc);
2534         }
2535
2536         RETURN(0);
2537 }
2538
2539 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2540                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2541 {
2542         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2543 }
2544
2545 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2546                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2547 {
2548         struct mdt_lock_handle tmp = *lh;
2549         int rc;
2550
2551         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2552         if (rc == 0)
2553                 *lh = tmp;
2554
2555         return rc == 0;
2556 }
2557
2558 /**
2559  * Save a lock within request object.
2560  *
2561  * Keep the lock referenced until whether client ACK or transaction
2562  * commit happens or release the lock immediately depending on input
2563  * parameters. If COS is ON, a write lock is converted to COS lock
2564  * before saving.
2565  *
2566  * \param info thead info object
2567  * \param h lock handle
2568  * \param mode lock mode
2569  * \param decref force immediate lock releasing
2570  */
2571 static
2572 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2573                    ldlm_mode_t mode, int decref)
2574 {
2575         ENTRY;
2576
2577         if (lustre_handle_is_used(h)) {
2578                 if (decref || !info->mti_has_trans ||
2579                     !(mode & (LCK_PW | LCK_EX))){
2580                         mdt_fid_unlock(h, mode);
2581                 } else {
2582                         struct mdt_device *mdt = info->mti_mdt;
2583                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2584                         struct ptlrpc_request *req = mdt_info_req(info);
2585                         int no_ack = 0;
2586
2587                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2588                                  h->cookie);
2589                         /* there is no request if mdt_object_unlock() is called
2590                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2591                         if (likely(req != NULL)) {
2592                                 CDEBUG(D_HA, "request = %p reply state = %p"
2593                                        " transno = "LPD64"\n", req,
2594                                        req->rq_reply_state, req->rq_transno);
2595                                 if (mdt_cos_is_enabled(mdt)) {
2596                                         no_ack = 1;
2597                                         ldlm_lock_downgrade(lock, LCK_COS);
2598                                         mode = LCK_COS;
2599                                 }
2600                                 ptlrpc_save_lock(req, h, mode, no_ack);
2601                         } else {
2602                                 ldlm_lock_decref(h, mode);
2603                         }
2604                         if (mdt_is_lock_sync(lock)) {
2605                                 CDEBUG(D_HA, "found sync-lock,"
2606                                        " async commit started\n");
2607                                 mdt_device_commit_async(info->mti_env,
2608                                                         mdt);
2609                         }
2610                         LDLM_LOCK_PUT(lock);
2611                 }
2612                 h->cookie = 0ull;
2613         }
2614
2615         EXIT;
2616 }
2617
2618 /**
2619  * Unlock mdt object.
2620  *
2621  * Immeditely release the regular lock and the PDO lock or save the
2622  * lock in reqeuest and keep them referenced until client ACK or
2623  * transaction commit.
2624  *
2625  * \param info thread info object
2626  * \param o mdt object
2627  * \param lh mdt lock handle referencing regular and PDO locks
2628  * \param decref force immediate lock releasing
2629  */
2630 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2631                        struct mdt_lock_handle *lh, int decref)
2632 {
2633         ENTRY;
2634
2635         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2636         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2637
2638         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2639                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2640
2641         EXIT;
2642 }
2643
2644 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2645                                         const struct lu_fid *f,
2646                                         struct mdt_lock_handle *lh,
2647                                         __u64 ibits)
2648 {
2649         struct mdt_object *o;
2650
2651         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2652         if (!IS_ERR(o)) {
2653                 int rc;
2654
2655                 rc = mdt_object_lock(info, o, lh, ibits,
2656                                      MDT_LOCAL_LOCK);
2657                 if (rc != 0) {
2658                         mdt_object_put(info->mti_env, o);
2659                         o = ERR_PTR(rc);
2660                 }
2661         }
2662         return o;
2663 }
2664
2665 void mdt_object_unlock_put(struct mdt_thread_info * info,
2666                            struct mdt_object * o,
2667                            struct mdt_lock_handle *lh,
2668                            int decref)
2669 {
2670         mdt_object_unlock(info, o, lh, decref);
2671         mdt_object_put(info->mti_env, o);
2672 }
2673
2674 /*
2675  * Generic code handling requests that have struct mdt_body passed in:
2676  *
2677  *  - extract mdt_body from request and save it in @info, if present;
2678  *
2679  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2680  *  @info;
2681  *
2682  *  - if HABEO_CORPUS flag is set for this request type check whether object
2683  *  actually exists on storage (lu_object_exists()).
2684  *
2685  */
2686 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2687 {
2688         const struct mdt_body    *body;
2689         struct mdt_object        *obj;
2690         const struct lu_env      *env;
2691         struct req_capsule       *pill;
2692         int                       rc;
2693         ENTRY;
2694
2695         env = info->mti_env;
2696         pill = info->mti_pill;
2697
2698         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2699         if (body == NULL)
2700                 RETURN(-EFAULT);
2701
2702         if (!(body->valid & OBD_MD_FLID))
2703                 RETURN(0);
2704
2705         if (!fid_is_sane(&body->fid1)) {
2706                 CERROR("Invalid fid: "DFID"\n", PFID(&body->fid1));
2707                 RETURN(-EINVAL);
2708         }
2709
2710         /*
2711          * Do not get size or any capa fields before we check that request
2712          * contains capa actually. There are some requests which do not, for
2713          * instance MDS_IS_SUBDIR.
2714          */
2715         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2716             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2717                 mdt_set_capainfo(info, 0, &body->fid1,
2718                                  req_capsule_client_get(pill, &RMF_CAPA1));
2719
2720         obj = mdt_object_find(env, info->mti_mdt, &body->fid1);
2721         if (!IS_ERR(obj)) {
2722                 if ((flags & HABEO_CORPUS) &&
2723                     !mdt_object_exists(obj)) {
2724                         mdt_object_put(env, obj);
2725                         /* for capability renew ENOENT will be handled in
2726                          * mdt_renew_capa */
2727                         if (body->valid & OBD_MD_FLOSSCAPA)
2728                                 rc = 0;
2729                         else
2730                                 rc = -ENOENT;
2731                 } else {
2732                         info->mti_object = obj;
2733                         rc = 0;
2734                 }
2735         } else
2736                 rc = PTR_ERR(obj);
2737
2738         RETURN(rc);
2739 }
2740
2741 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2742 {
2743         struct req_capsule *pill = info->mti_pill;
2744         int rc;
2745         ENTRY;
2746
2747         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2748                 rc = mdt_body_unpack(info, flags);
2749         else
2750                 rc = 0;
2751
2752         if (rc == 0 && (flags & HABEO_REFERO)) {
2753                 /* Pack reply. */
2754                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2755                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2756                                              DEF_REP_MD_SIZE);
2757                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2758                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2759                                              RCL_SERVER, 0);
2760
2761                 rc = req_capsule_server_pack(pill);
2762         }
2763         RETURN(rc);
2764 }
2765
2766 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2767 {
2768         struct md_device *next = m->mdt_child;
2769
2770         return next->md_ops->mdo_init_capa_ctxt(env, next,
2771                                                 m->mdt_lut.lut_mds_capa,
2772                                                 m->mdt_capa_timeout,
2773                                                 m->mdt_capa_alg,
2774                                                 m->mdt_capa_keys);
2775 }
2776
2777 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2778 {
2779         lh->mlh_type = MDT_NUL_LOCK;
2780         lh->mlh_reg_lh.cookie = 0ull;
2781         lh->mlh_reg_mode = LCK_MINMODE;
2782         lh->mlh_pdo_lh.cookie = 0ull;
2783         lh->mlh_pdo_mode = LCK_MINMODE;
2784         lh->mlh_rreg_lh.cookie = 0ull;
2785         lh->mlh_rreg_mode = LCK_MINMODE;
2786 }
2787
2788 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2789 {
2790         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2791         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2792 }
2793
2794 /*
2795  * Initialize fields of struct mdt_thread_info. Other fields are left in
2796  * uninitialized state, because it's too expensive to zero out whole
2797  * mdt_thread_info (> 1K) on each request arrival.
2798  */
2799 void mdt_thread_info_init(struct ptlrpc_request *req,
2800                           struct mdt_thread_info *info)
2801 {
2802         int i;
2803
2804         info->mti_pill = &req->rq_pill;
2805
2806         /* lock handle */
2807         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2808                 mdt_lock_handle_init(&info->mti_lh[i]);
2809
2810         /* mdt device: it can be NULL while CONNECT */
2811         if (req->rq_export) {
2812                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2813                 info->mti_exp = req->rq_export;
2814         } else
2815                 info->mti_mdt = NULL;
2816         info->mti_env = req->rq_svc_thread->t_env;
2817         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2818
2819         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2820         info->mti_big_buf = LU_BUF_NULL;
2821         info->mti_body = NULL;
2822         info->mti_object = NULL;
2823         info->mti_dlm_req = NULL;
2824         info->mti_has_trans = 0;
2825         info->mti_cross_ref = 0;
2826         info->mti_opdata = 0;
2827         info->mti_big_lmm_used = 0;
2828
2829         info->mti_spec.no_create = 0;
2830         info->mti_spec.sp_rm_entry = 0;
2831
2832         info->mti_spec.u.sp_ea.eadata = NULL;
2833         info->mti_spec.u.sp_ea.eadatalen = 0;
2834 }
2835
2836 void mdt_thread_info_fini(struct mdt_thread_info *info)
2837 {
2838         int i;
2839
2840         if (info->mti_object != NULL) {
2841                 mdt_object_put(info->mti_env, info->mti_object);
2842                 info->mti_object = NULL;
2843         }
2844
2845         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2846                 mdt_lock_handle_fini(&info->mti_lh[i]);
2847         info->mti_env = NULL;
2848         info->mti_pill = NULL;
2849         info->mti_exp = NULL;
2850
2851         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2852                 lu_buf_free(&info->mti_big_buf);
2853 }
2854
2855 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2856 {
2857         struct mdt_thread_info  *mti;
2858         struct lustre_capa      *lc;
2859
2860         mti = mdt_th_info(tsi->tsi_env);
2861         LASSERT(mti != NULL);
2862
2863         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2864         if (tsi->tsi_corpus != NULL) {
2865                 struct req_capsule *pill = tsi->tsi_pill;
2866
2867                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2868                 lu_object_get(tsi->tsi_corpus);
2869
2870                 /*
2871                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2872                  * due to mdt_set_capainfo().
2873                  */
2874                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2875                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2876                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2877                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
2878                 }
2879         }
2880         mti->mti_body = tsi->tsi_mdt_body;
2881         mti->mti_dlm_req = tsi->tsi_dlm_req;
2882
2883         return mti;
2884 }
2885
2886 int mdt_tgt_connect(struct tgt_session_info *tsi)
2887 {
2888         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2889         int                      rc;
2890
2891         ENTRY;
2892
2893         rc = tgt_connect(tsi);
2894         if (rc != 0)
2895                 RETURN(rc);
2896
2897         rc = mdt_init_idmap(tsi);
2898         if (rc != 0)
2899                 GOTO(err, rc);
2900         RETURN(0);
2901 err:
2902         obd_disconnect(class_export_get(req->rq_export));
2903         return rc;
2904 }
2905
2906 enum mdt_it_code {
2907         MDT_IT_OPEN,
2908         MDT_IT_OCREAT,
2909         MDT_IT_CREATE,
2910         MDT_IT_GETATTR,
2911         MDT_IT_READDIR,
2912         MDT_IT_LOOKUP,
2913         MDT_IT_UNLINK,
2914         MDT_IT_TRUNC,
2915         MDT_IT_GETXATTR,
2916         MDT_IT_LAYOUT,
2917         MDT_IT_QUOTA,
2918         MDT_IT_NR
2919 };
2920
2921 static int mdt_intent_getattr(enum mdt_it_code opcode,
2922                               struct mdt_thread_info *info,
2923                               struct ldlm_lock **,
2924                               __u64);
2925
2926 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2927                                 struct mdt_thread_info *info,
2928                                 struct ldlm_lock **lockp,
2929                                 __u64 flags);
2930
2931 static int mdt_intent_layout(enum mdt_it_code opcode,
2932                              struct mdt_thread_info *info,
2933                              struct ldlm_lock **,
2934                              __u64);
2935 static int mdt_intent_reint(enum mdt_it_code opcode,
2936                             struct mdt_thread_info *info,
2937                             struct ldlm_lock **,
2938                             __u64);
2939
2940 static struct mdt_it_flavor {
2941         const struct req_format *it_fmt;
2942         __u32                    it_flags;
2943         int                    (*it_act)(enum mdt_it_code ,
2944                                          struct mdt_thread_info *,
2945                                          struct ldlm_lock **,
2946                                          __u64);
2947         long                     it_reint;
2948 } mdt_it_flavor[] = {
2949         [MDT_IT_OPEN]     = {
2950                 .it_fmt   = &RQF_LDLM_INTENT,
2951                 /*.it_flags = HABEO_REFERO,*/
2952                 .it_flags = 0,
2953                 .it_act   = mdt_intent_reint,
2954                 .it_reint = REINT_OPEN
2955         },
2956         [MDT_IT_OCREAT]   = {
2957                 .it_fmt   = &RQF_LDLM_INTENT,
2958                 /*
2959                  * OCREAT is not a MUTABOR request as if the file
2960                  * already exists.
2961                  * We do the extra check of OBD_CONNECT_RDONLY in
2962                  * mdt_reint_open() when we really need to create
2963                  * the object.
2964                  */
2965                 .it_flags = 0,
2966                 .it_act   = mdt_intent_reint,
2967                 .it_reint = REINT_OPEN
2968         },
2969         [MDT_IT_CREATE]   = {
2970                 .it_fmt   = &RQF_LDLM_INTENT,
2971                 .it_flags = MUTABOR,
2972                 .it_act   = mdt_intent_reint,
2973                 .it_reint = REINT_CREATE
2974         },
2975         [MDT_IT_GETATTR]  = {
2976                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2977                 .it_flags = HABEO_REFERO,
2978                 .it_act   = mdt_intent_getattr
2979         },
2980         [MDT_IT_READDIR]  = {
2981                 .it_fmt   = NULL,
2982                 .it_flags = 0,
2983                 .it_act   = NULL
2984         },
2985         [MDT_IT_LOOKUP]   = {
2986                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2987                 .it_flags = HABEO_REFERO,
2988                 .it_act   = mdt_intent_getattr
2989         },
2990         [MDT_IT_UNLINK]   = {
2991                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2992                 .it_flags = MUTABOR,
2993                 .it_act   = NULL,
2994                 .it_reint = REINT_UNLINK
2995         },
2996         [MDT_IT_TRUNC]    = {
2997                 .it_fmt   = NULL,
2998                 .it_flags = MUTABOR,
2999                 .it_act   = NULL
3000         },
3001         [MDT_IT_GETXATTR] = {
3002                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3003                 .it_flags = HABEO_CORPUS,
3004                 .it_act   = mdt_intent_getxattr
3005         },
3006         [MDT_IT_LAYOUT] = {
3007                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3008                 .it_flags = 0,
3009                 .it_act   = mdt_intent_layout
3010         }
3011 };
3012
3013 int mdt_intent_lock_replace(struct mdt_thread_info *info,
3014                             struct ldlm_lock **lockp,
3015                             struct ldlm_lock *new_lock,
3016                             struct mdt_lock_handle *lh,
3017                             __u64 flags)
3018 {
3019         struct ptlrpc_request  *req = mdt_info_req(info);
3020         struct ldlm_lock       *lock = *lockp;
3021
3022         /*
3023          * Get new lock only for cases when possible resent did not find any
3024          * lock.
3025          */
3026         if (new_lock == NULL)
3027                 new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3028
3029         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3030                 lh->mlh_reg_lh.cookie = 0;
3031                 RETURN(0);
3032         }
3033
3034         LASSERTF(new_lock != NULL,
3035                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
3036
3037         /*
3038          * If we've already given this lock to a client once, then we should
3039          * have no readers or writers.  Otherwise, we should have one reader
3040          * _or_ writer ref (which will be zeroed below) before returning the
3041          * lock to a client.
3042          */
3043         if (new_lock->l_export == req->rq_export) {
3044                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3045         } else {
3046                 LASSERT(new_lock->l_export == NULL);
3047                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3048         }
3049
3050         *lockp = new_lock;
3051
3052         if (new_lock->l_export == req->rq_export) {
3053                 /*
3054                  * Already gave this to the client, which means that we
3055                  * reconstructed a reply.
3056                  */
3057                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3058                         MSG_RESENT);
3059                 lh->mlh_reg_lh.cookie = 0;
3060                 RETURN(ELDLM_LOCK_REPLACED);
3061         }
3062
3063         /*
3064          * Fixup the lock to be given to the client.
3065          */
3066         lock_res_and_lock(new_lock);
3067         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3068          * possible blocking AST. */
3069         while (new_lock->l_readers > 0) {
3070                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3071                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3072                 new_lock->l_readers--;
3073         }
3074         while (new_lock->l_writers > 0) {
3075                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3076                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3077                 new_lock->l_writers--;
3078         }
3079
3080         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3081         new_lock->l_blocking_ast = lock->l_blocking_ast;
3082         new_lock->l_completion_ast = lock->l_completion_ast;
3083         new_lock->l_remote_handle = lock->l_remote_handle;
3084         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3085
3086         unlock_res_and_lock(new_lock);
3087
3088         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3089                      &new_lock->l_remote_handle,
3090                      &new_lock->l_exp_hash);
3091
3092         LDLM_LOCK_RELEASE(new_lock);
3093         lh->mlh_reg_lh.cookie = 0;
3094
3095         RETURN(ELDLM_LOCK_REPLACED);
3096 }
3097
3098 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3099                                     struct ldlm_lock *new_lock,
3100                                     struct ldlm_lock **old_lock,
3101                                     struct mdt_lock_handle *lh,
3102                                     enum mdt_it_code opcode)
3103 {
3104         struct ptlrpc_request  *req = mdt_info_req(info);
3105         struct obd_export      *exp = req->rq_export;
3106         struct lustre_handle    remote_hdl;
3107         struct ldlm_request    *dlmreq;
3108         struct ldlm_lock       *lock;
3109
3110         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3111                 return;
3112
3113         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3114         remote_hdl = dlmreq->lock_handle[0];
3115         /* If the client does not require open lock, it does not need to
3116          * search lock in exp_lock_hash, since the server thread will
3117          * make sure the lock will be released, and the resend request
3118          * can always re-enqueue the lock */
3119         if ((opcode != MDT_IT_OPEN) || (opcode == MDT_IT_OPEN &&
3120             info->mti_spec.sp_cr_flags & MDS_OPEN_LOCK)) {
3121                 /* In the function below, .hs_keycmp resolves to
3122                  * ldlm_export_lock_keycmp() */
3123                 /* coverity[overrun-buffer-val] */
3124                 lock = cfs_hash_lookup(exp->exp_lock_hash, &remote_hdl);
3125                 if (lock) {
3126                         lock_res_and_lock(lock);
3127                         if (lock != new_lock) {
3128                                 lh->mlh_reg_lh.cookie = lock->l_handle.h_cookie;
3129                                 lh->mlh_reg_mode = lock->l_granted_mode;
3130
3131                                 LDLM_DEBUG(lock, "Restoring lock cookie");
3132                                 DEBUG_REQ(D_DLMTRACE, req,
3133                                           "restoring lock cookie "LPX64,
3134                                           lh->mlh_reg_lh.cookie);
3135                                 if (old_lock)
3136                                         *old_lock = LDLM_LOCK_GET(lock);
3137                                 cfs_hash_put(exp->exp_lock_hash,
3138                                              &lock->l_exp_hash);
3139                                 unlock_res_and_lock(lock);
3140                                 return;
3141                         }
3142                         cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
3143                         unlock_res_and_lock(lock);
3144                 }
3145         }
3146         /*
3147          * If the xid matches, then we know this is a resent request, and allow
3148          * it. (It's probably an OPEN, for which we don't send a lock.
3149          */
3150         if (req_xid_is_last(req))
3151                 return;
3152
3153         /*
3154          * This remote handle isn't enqueued, so we never received or processed
3155          * this request.  Clear MSG_RESENT, because it can be handled like any
3156          * normal request now.
3157          */
3158         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3159
3160         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3161                   remote_hdl.cookie);
3162 }
3163
3164 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3165                                 struct mdt_thread_info *info,
3166                                 struct ldlm_lock **lockp,
3167                                 __u64 flags)
3168 {
3169         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3170         struct ldlm_reply      *ldlm_rep = NULL;
3171         int rc, grc;
3172
3173         /*
3174          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3175          * (for the resend case) or a new lock. Below we will use it to
3176          * replace the original lock.
3177          */
3178         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3179         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3180                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3181                 rc = mdt_object_lock(info, info->mti_object, lhc,
3182                                         MDS_INODELOCK_XATTR,
3183                                         MDT_LOCAL_LOCK);
3184                 if (rc)
3185                         return rc;
3186         }
3187
3188         grc = mdt_getxattr(info);
3189
3190         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3191
3192         if (mdt_info_req(info)->rq_repmsg != NULL)
3193                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3194         if (ldlm_rep == NULL)
3195                 RETURN(err_serious(-EFAULT));
3196
3197         ldlm_rep->lock_policy_res2 = grc;
3198
3199         return rc;
3200 }
3201
3202 static int mdt_intent_getattr(enum mdt_it_code opcode,
3203                               struct mdt_thread_info *info,
3204                               struct ldlm_lock **lockp,
3205                               __u64 flags)
3206 {
3207         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3208         struct ldlm_lock       *new_lock = NULL;
3209         __u64                   child_bits;
3210         struct ldlm_reply      *ldlm_rep;
3211         struct ptlrpc_request  *req;
3212         struct mdt_body        *reqbody;
3213         struct mdt_body        *repbody;
3214         int                     rc, rc2;
3215         ENTRY;
3216
3217         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3218         LASSERT(reqbody);
3219
3220         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3221         LASSERT(repbody);
3222
3223         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
3224         repbody->eadatasize = 0;
3225         repbody->aclsize = 0;
3226
3227         switch (opcode) {
3228         case MDT_IT_LOOKUP:
3229                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3230                 break;
3231         case MDT_IT_GETATTR:
3232                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3233                              MDS_INODELOCK_PERM;
3234                 break;
3235         default:
3236                 CERROR("Unsupported intent (%d)\n", opcode);
3237                 GOTO(out_shrink, rc = -EINVAL);
3238         }
3239
3240         rc = mdt_init_ucred(info, reqbody);
3241         if (rc)
3242                 GOTO(out_shrink, rc);
3243
3244         req = info->mti_pill->rc_req;
3245         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3246         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3247
3248         /* Get lock from request for possible resent case. */
3249         mdt_intent_fixup_resent(info, *lockp, &new_lock, lhc, opcode);
3250
3251         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3252         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3253
3254         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3255                 ldlm_rep->lock_policy_res2 = 0;
3256         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3257             ldlm_rep->lock_policy_res2) {
3258                 lhc->mlh_reg_lh.cookie = 0ull;
3259                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3260         }
3261
3262         rc = mdt_intent_lock_replace(info, lockp, new_lock, lhc, flags);
3263         EXIT;
3264 out_ucred:
3265         mdt_exit_ucred(info);
3266 out_shrink:
3267         mdt_client_compatibility(info);
3268         rc2 = mdt_fix_reply(info);
3269         if (rc == 0)
3270                 rc = rc2;
3271         return rc;
3272 }
3273
3274 static int mdt_intent_layout(enum mdt_it_code opcode,
3275                              struct mdt_thread_info *info,
3276                              struct ldlm_lock **lockp,
3277                              __u64 flags)
3278 {
3279         struct layout_intent *layout;
3280         struct lu_fid *fid;
3281         struct mdt_object *obj = NULL;
3282         struct md_object *child = NULL;
3283         int rc;
3284         ENTRY;
3285
3286         if (opcode != MDT_IT_LAYOUT) {
3287                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3288                         opcode);
3289                 RETURN(-EINVAL);
3290         }
3291
3292         fid = &info->mti_tmp_fid2;
3293         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3294
3295         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3296         if (IS_ERR(obj))
3297                 RETURN(PTR_ERR(obj));
3298
3299         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3300                 child = mdt_object_child(obj);
3301
3302                 /* get the length of lsm */
3303                 rc = mo_xattr_get(info->mti_env, child, &LU_BUF_NULL,
3304                                   XATTR_NAME_LOV);
3305
3306                 if (rc > info->mti_mdt->mdt_max_mdsize)
3307                         info->mti_mdt->mdt_max_mdsize = rc;
3308         }
3309
3310         mdt_object_put(info->mti_env, obj);
3311
3312         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3313         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3314                         ldlm_lvbo_size(*lockp));
3315         rc = req_capsule_server_pack(info->mti_pill);
3316         if (rc != 0)
3317                 RETURN(-EINVAL);
3318
3319         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3320         LASSERT(layout != NULL);
3321         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3322                 /* return to normal ldlm handling */
3323                 RETURN(0);
3324
3325         CERROR("%s: Unsupported layout intent (%d)\n",
3326                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3327         RETURN(-EINVAL);
3328 }
3329
3330 static int mdt_intent_reint(enum mdt_it_code opcode,
3331                             struct mdt_thread_info *info,
3332                             struct ldlm_lock **lockp,
3333                             __u64 flags)
3334 {
3335         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3336         struct ldlm_reply      *rep = NULL;
3337         long                    opc;
3338         int                     rc;
3339
3340         static const struct req_format *intent_fmts[REINT_MAX] = {
3341                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3342                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3343         };
3344
3345         ENTRY;
3346
3347         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3348         if (opc < 0)
3349                 RETURN(opc);
3350
3351         if (mdt_it_flavor[opcode].it_reint != opc) {
3352                 CERROR("Reint code %ld doesn't match intent: %d\n",
3353                        opc, opcode);
3354                 RETURN(err_serious(-EPROTO));
3355         }
3356
3357         /* Get lock from request for possible resent case. */
3358         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3359
3360         rc = mdt_reint_internal(info, lhc, opc);
3361
3362         /* Check whether the reply has been packed successfully. */
3363         if (mdt_info_req(info)->rq_repmsg != NULL)
3364                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3365         if (rep == NULL)
3366                 RETURN(err_serious(-EFAULT));
3367
3368         /* MDC expects this in any case */
3369         if (rc != 0)
3370                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3371
3372         /* the open lock or the lock for cross-ref object should be
3373          * returned to the client */
3374         if (rc == -EREMOTE || mdt_get_disposition(rep, DISP_OPEN_LOCK)) {
3375                 LASSERT(lustre_handle_is_used(&lhc->mlh_reg_lh));
3376                 rep->lock_policy_res2 = 0;
3377                 rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3378                 RETURN(rc);
3379         }
3380
3381         rep->lock_policy_res2 = clear_serious(rc);
3382
3383         if (rep->lock_policy_res2 == -ENOENT &&
3384             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3385                 rep->lock_policy_res2 = 0;
3386
3387         if (rc == -ENOTCONN || rc == -ENODEV ||
3388             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3389                 /*
3390                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3391                  * will be returned by rq_status, and client at ptlrpc layer
3392                  * will detect this, then disconnect, reconnect the import
3393                  * immediately, instead of impacting the following the rpc.
3394                  */
3395                 lhc->mlh_reg_lh.cookie = 0ull;
3396                 RETURN(rc);
3397         } else {
3398                 /*
3399                  * For other cases, the error will be returned by intent.
3400                  * and client will retrieve the result from intent.
3401                  */
3402                  /*
3403                   * FIXME: when open lock is finished, that should be
3404                   * checked here.
3405                   */
3406                 if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3407                         LASSERTF(rc == 0, "Error occurred but lock handle "
3408                                  "is still in use, rc = %d\n", rc);
3409                         rep->lock_policy_res2 = 0;
3410                         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3411                         RETURN(rc);
3412                 } else {
3413                         lhc->mlh_reg_lh.cookie = 0ull;
3414                         RETURN(ELDLM_LOCK_ABORTED);
3415                 }
3416         }
3417 }
3418
3419 static int mdt_intent_code(long itcode)
3420 {
3421         int rc;
3422
3423         switch(itcode) {
3424         case IT_OPEN:
3425                 rc = MDT_IT_OPEN;
3426                 break;
3427         case IT_OPEN|IT_CREAT:
3428                 rc = MDT_IT_OCREAT;
3429                 break;
3430         case IT_CREAT:
3431                 rc = MDT_IT_CREATE;
3432                 break;
3433         case IT_READDIR:
3434                 rc = MDT_IT_READDIR;
3435                 break;
3436         case IT_GETATTR:
3437                 rc = MDT_IT_GETATTR;
3438                 break;
3439         case IT_LOOKUP:
3440                 rc = MDT_IT_LOOKUP;
3441                 break;
3442         case IT_UNLINK:
3443                 rc = MDT_IT_UNLINK;
3444                 break;
3445         case IT_TRUNC:
3446                 rc = MDT_IT_TRUNC;
3447                 break;
3448         case IT_GETXATTR:
3449                 rc = MDT_IT_GETXATTR;
3450                 break;
3451         case IT_LAYOUT:
3452                 rc = MDT_IT_LAYOUT;
3453                 break;
3454         case IT_QUOTA_DQACQ:
3455         case IT_QUOTA_CONN:
3456                 rc = MDT_IT_QUOTA;
3457                 break;
3458         default:
3459                 CERROR("Unknown intent opcode: %ld\n", itcode);
3460                 rc = -EINVAL;
3461                 break;
3462         }
3463         return rc;
3464 }
3465
3466 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3467                           struct ldlm_lock **lockp, __u64 flags)
3468 {
3469         struct req_capsule   *pill;
3470         struct mdt_it_flavor *flv;
3471         int opc;
3472         int rc;
3473         ENTRY;
3474
3475         opc = mdt_intent_code(itopc);
3476         if (opc < 0)
3477                 RETURN(-EINVAL);
3478
3479         pill = info->mti_pill;
3480
3481         if (opc == MDT_IT_QUOTA) {
3482                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3483
3484                 if (qmt == NULL)
3485                         RETURN(-EOPNOTSUPP);
3486
3487                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3488                 /* pass the request to quota master */
3489                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3490                                                  mdt_info_req(info), lockp,
3491                                                  flags);
3492                 RETURN(rc);
3493         }
3494
3495         flv  = &mdt_it_flavor[opc];
3496         if (flv->it_fmt != NULL)
3497                 req_capsule_extend(pill, flv->it_fmt);
3498
3499         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3500         if (rc == 0) {
3501                 struct ptlrpc_request *req = mdt_info_req(info);
3502                 if (flv->it_flags & MUTABOR &&
3503                     exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3504                         RETURN(-EROFS);
3505         }
3506         if (rc == 0 && flv->it_act != NULL) {
3507                 struct ldlm_reply *rep;
3508
3509                 /* execute policy */
3510                 rc = flv->it_act(opc, info, lockp, flags);
3511
3512                 /* Check whether the reply has been packed successfully. */
3513                 if (mdt_info_req(info)->rq_repmsg != NULL) {
3514                         rep = req_capsule_server_get(info->mti_pill,
3515                                                      &RMF_DLM_REP);
3516                         rep->lock_policy_res2 =
3517                                 ptlrpc_status_hton(rep->lock_policy_res2);
3518                 }
3519         } else {
3520                 rc = -EPROTO;
3521         }
3522         RETURN(rc);
3523 }
3524
3525 static int mdt_intent_policy(struct ldlm_namespace *ns,
3526                              struct ldlm_lock **lockp, void *req_cookie,
3527                              ldlm_mode_t mode, __u64 flags, void *data)
3528 {
3529         struct tgt_session_info *tsi;
3530         struct mdt_thread_info  *info;
3531         struct ptlrpc_request   *req  =  req_cookie;
3532         struct ldlm_intent      *it;
3533         struct req_capsule      *pill;
3534         int rc;
3535
3536         ENTRY;
3537
3538         LASSERT(req != NULL);
3539
3540         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3541
3542         info = tsi2mdt_info(tsi);
3543         LASSERT(info != NULL);
3544         pill = info->mti_pill;
3545         LASSERT(pill->rc_req == req);
3546
3547         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3548                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3549                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3550                 if (it != NULL) {
3551                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3552                         if (rc == 0)
3553                                 rc = ELDLM_OK;
3554
3555                         /* Lock without inodebits makes no sense and will oops
3556                          * later in ldlm. Let's check it now to see if we have
3557                          * ibits corrupted somewhere in mdt_intent_opc().
3558                          * The case for client miss to set ibits has been
3559                          * processed by others. */
3560                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3561                                         lr_type == LDLM_IBITS,
3562                                      info->mti_dlm_req->lock_desc.\
3563                                         l_policy_data.l_inodebits.bits != 0));
3564                 } else
3565                         rc = err_serious(-EFAULT);
3566         } else {
3567                 /* No intent was provided */
3568                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3569                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3570                 rc = req_capsule_server_pack(pill);
3571                 if (rc)
3572                         rc = err_serious(rc);
3573         }
3574         mdt_thread_info_fini(info);
3575         RETURN(rc);
3576 }
3577
3578 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3579 {
3580         struct seq_server_site  *ss = mdt_seq_site(mdt);
3581
3582         if (ss->ss_node_id == 0)
3583                 return;
3584
3585         if (ss->ss_client_seq != NULL) {
3586                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3587                 ss->ss_client_seq->lcs_exp = NULL;
3588         }
3589
3590         if (ss->ss_server_fld != NULL) {
3591                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3592                 ss->ss_server_fld->lsf_control_exp = NULL;
3593         }
3594 }
3595
3596 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3597 {
3598         struct seq_server_site *ss = mdt_seq_site(mdt);
3599
3600         if (ss == NULL)
3601                 return;
3602
3603         if (ss->ss_server_seq == NULL)
3604                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3605
3606         return;
3607 }
3608
3609 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3610 {
3611         mdt_seq_fini_cli(mdt);
3612         mdt_deregister_seq_exp(mdt);
3613
3614         return seq_site_fini(env, mdt_seq_site(mdt));
3615 }
3616
3617 /**
3618  * It will retrieve its FLDB entries from MDT0, and it only happens
3619  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3620  * and it needs to refresh FLDB from the MDT0.
3621  **/
3622 static int mdt_register_lwp_callback(void *data)
3623 {
3624         struct lu_env           env;
3625         struct mdt_device       *mdt = data;
3626         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3627         int                     rc;
3628         ENTRY;
3629
3630         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3631
3632         if (!likely(fld->lsf_new))
3633                 RETURN(0);
3634
3635         rc = lu_env_init(&env, LCT_MD_THREAD);
3636         if (rc) {
3637                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3638                 RETURN(rc);
3639         }
3640
3641         rc = fld_update_from_controller(&env, fld);
3642         if (rc != 0) {
3643                 CERROR("%s: cannot update controller: rc = %d\n",
3644                        mdt_obd_name(mdt), rc);
3645                 GOTO(out, rc);
3646         }
3647 out:
3648         lu_env_fini(&env);
3649         RETURN(rc);
3650 }
3651
3652 static int mdt_register_seq_exp(struct mdt_device *mdt)
3653 {
3654         struct seq_server_site  *ss = mdt_seq_site(mdt);
3655         char                    *lwp_name = NULL;
3656         int                     rc;
3657
3658         if (ss->ss_node_id == 0)
3659                 return 0;
3660
3661         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3662         if (lwp_name == NULL)
3663                 GOTO(out_free, rc = -ENOMEM);
3664
3665         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3666         if (rc != 0)
3667                 GOTO(out_free, rc);
3668
3669         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3670                                       NULL, NULL);
3671         if (rc != 0)
3672                 GOTO(out_free, rc);
3673
3674         rc = lustre_register_lwp_item(lwp_name,
3675                                       &ss->ss_server_fld->lsf_control_exp,
3676                                       mdt_register_lwp_callback, mdt);
3677         if (rc != 0) {
3678                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3679                 ss->ss_client_seq->lcs_exp = NULL;
3680                 GOTO(out_free, rc);
3681         }
3682 out_free:
3683         if (lwp_name != NULL)
3684                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3685
3686         return rc;
3687 }
3688
3689 /*
3690  * Init client sequence manager which is used by local MDS to talk to sequence
3691  * controller on remote node.
3692  */
3693 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3694 {
3695         struct seq_server_site  *ss = mdt_seq_site(mdt);
3696         int                     rc;
3697         char                    *prefix;
3698         ENTRY;
3699
3700         /* check if this is adding the first MDC and controller is not yet
3701          * initialized. */
3702         OBD_ALLOC_PTR(ss->ss_client_seq);
3703         if (ss->ss_client_seq == NULL)
3704                 RETURN(-ENOMEM);
3705
3706         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3707         if (prefix == NULL) {
3708                 OBD_FREE_PTR(ss->ss_client_seq);
3709                 ss->ss_client_seq = NULL;
3710                 RETURN(-ENOMEM);
3711         }
3712
3713         /* Note: seq_client_fini will be called in seq_site_fini */
3714         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3715         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3716                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3717                                                             NULL);
3718         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3719         if (rc != 0) {
3720                 OBD_FREE_PTR(ss->ss_client_seq);
3721                 ss->ss_client_seq = NULL;
3722                 RETURN(rc);
3723         }
3724
3725         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3726
3727         RETURN(rc);
3728 }
3729
3730 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3731 {
3732         struct seq_server_site  *ss;
3733         int                     rc;
3734         ENTRY;
3735
3736         ss = mdt_seq_site(mdt);
3737         /* init sequence controller server(MDT0) */
3738         if (ss->ss_node_id == 0) {
3739                 OBD_ALLOC_PTR(ss->ss_control_seq);
3740                 if (ss->ss_control_seq == NULL)
3741                         RETURN(-ENOMEM);
3742
3743                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3744                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3745                                      ss);
3746                 if (rc)
3747                         GOTO(out_seq_fini, rc);
3748         }
3749
3750         /* Init normal sequence server */
3751         OBD_ALLOC_PTR(ss->ss_server_seq);
3752         if (ss->ss_server_seq == NULL)
3753                 GOTO(out_seq_fini, rc = -ENOMEM);
3754
3755         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3756                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3757         if (rc)
3758                 GOTO(out_seq_fini, rc);
3759
3760         /* init seq client for seq server to talk to seq controller(MDT0) */
3761         rc = mdt_seq_init_cli(env, mdt);
3762         if (rc != 0)
3763                 GOTO(out_seq_fini, rc);
3764
3765         if (ss->ss_node_id != 0)
3766                 /* register controler export through lwp */
3767                 rc = mdt_register_seq_exp(mdt);
3768
3769         EXIT;
3770 out_seq_fini:
3771         if (rc)
3772                 mdt_seq_fini(env, mdt);
3773
3774         return rc;
3775 }
3776
3777 /*
3778  * FLD wrappers
3779  */
3780 static int mdt_fld_fini(const struct lu_env *env,
3781                         struct mdt_device *m)
3782 {
3783         struct seq_server_site *ss = mdt_seq_site(m);
3784         ENTRY;
3785
3786         if (ss && ss->ss_server_fld) {
3787                 fld_server_fini(env, ss->ss_server_fld);
3788                 OBD_FREE_PTR(ss->ss_server_fld);
3789                 ss->ss_server_fld = NULL;
3790         }
3791
3792         RETURN(0);
3793 }
3794
3795 static int mdt_fld_init(const struct lu_env *env,
3796                         const char *uuid,
3797                         struct mdt_device *m)
3798 {
3799         struct seq_server_site *ss;
3800         int rc;
3801         ENTRY;
3802
3803         ss = mdt_seq_site(m);
3804
3805         OBD_ALLOC_PTR(ss->ss_server_fld);
3806         if (ss->ss_server_fld == NULL)
3807                 RETURN(rc = -ENOMEM);
3808
3809         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3810                              LU_SEQ_RANGE_MDT);
3811         if (rc) {
3812                 OBD_FREE_PTR(ss->ss_server_fld);
3813                 ss->ss_server_fld = NULL;
3814                 RETURN(rc);
3815         }
3816
3817         RETURN(0);
3818 }
3819
3820 static void mdt_stack_pre_fini(const struct lu_env *env,
3821                            struct mdt_device *m, struct lu_device *top)
3822 {
3823         struct obd_device       *obd;
3824         struct lustre_cfg_bufs  *bufs;
3825         struct lustre_cfg       *lcfg;
3826         struct mdt_thread_info  *info;
3827         ENTRY;
3828
3829         LASSERT(top);
3830
3831         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3832         LASSERT(info != NULL);
3833
3834         bufs = &info->mti_u.bufs;
3835
3836         LASSERT(m->mdt_child_exp);
3837         LASSERT(m->mdt_child_exp->exp_obd);
3838         obd = m->mdt_child_exp->exp_obd;
3839
3840         /* process cleanup, pass mdt obd name to get obd umount flags */
3841         /* XXX: this is needed because all layers are referenced by
3842          * objects (some of them are pinned by osd, for example *
3843          * the proper solution should be a model where object used
3844          * by osd only doesn't have mdt/mdd slices -bzzz */
3845         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3846         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3847         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3848         if (!lcfg) {
3849                 CERROR("%s:Cannot alloc lcfg!\n", mdt_obd_name(m));
3850                 return;
3851         }
3852         top->ld_ops->ldo_process_config(env, top, lcfg);
3853         lustre_cfg_free(lcfg);
3854         EXIT;
3855 }
3856
3857 static void mdt_stack_fini(const struct lu_env *env,
3858                            struct mdt_device *m, struct lu_device *top)
3859 {
3860         struct obd_device       *obd = mdt2obd_dev(m);
3861         struct lustre_cfg_bufs  *bufs;
3862         struct lustre_cfg       *lcfg;
3863         struct mdt_thread_info  *info;
3864         char                     flags[3] = "";
3865         ENTRY;
3866
3867         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3868         LASSERT(info != NULL);
3869
3870         lu_dev_del_linkage(top->ld_site, top);
3871
3872         lu_site_purge(env, top->ld_site, -1);
3873
3874         bufs = &info->mti_u.bufs;
3875         /* process cleanup, pass mdt obd name to get obd umount flags */
3876         /* another purpose is to let all layers to release their objects */
3877         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3878         if (obd->obd_force)
3879                 strcat(flags, "F");
3880         if (obd->obd_fail)
3881                 strcat(flags, "A");
3882         lustre_cfg_bufs_set_string(bufs, 1, flags);
3883         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3884         if (!lcfg) {
3885                 CERROR("Cannot alloc lcfg!\n");
3886                 return;
3887         }
3888         LASSERT(top);
3889         top->ld_ops->ldo_process_config(env, top, lcfg);
3890         lustre_cfg_free(lcfg);
3891
3892         lu_site_purge(env, top->ld_site, -1);
3893
3894         m->mdt_child = NULL;
3895         m->mdt_bottom = NULL;
3896
3897         obd_disconnect(m->mdt_child_exp);
3898         m->mdt_child_exp = NULL;
3899
3900         obd_disconnect(m->mdt_bottom_exp);
3901         m->mdt_child_exp = NULL;
3902 }
3903
3904 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3905                                const char *next, struct obd_export **exp)
3906 {
3907         struct obd_connect_data *data = NULL;
3908         struct obd_device       *obd;
3909         int                      rc;
3910         ENTRY;
3911
3912         OBD_ALLOC_PTR(data);
3913         if (data == NULL)
3914                 GOTO(out, rc = -ENOMEM);
3915
3916         obd = class_name2obd(next);
3917         if (obd == NULL) {
3918                 CERROR("%s: can't locate next device: %s\n",
3919                        mdt_obd_name(m), next);
3920                 GOTO(out, rc = -ENOTCONN);
3921         }
3922
3923         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3924         data->ocd_version = LUSTRE_VERSION_CODE;
3925
3926         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3927         if (rc) {
3928                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3929                        mdt_obd_name(m), next, rc);
3930                 GOTO(out, rc);
3931         }
3932
3933 out:
3934         if (data)
3935                 OBD_FREE_PTR(data);
3936         RETURN(rc);
3937 }
3938
3939 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3940                           struct lustre_cfg *cfg)
3941 {
3942         char                   *dev = lustre_cfg_string(cfg, 0);
3943         int                     rc, name_size, uuid_size;
3944         char                   *name, *uuid, *p;
3945         struct lustre_cfg_bufs *bufs;
3946         struct lustre_cfg      *lcfg;
3947         struct obd_device      *obd;
3948         struct lustre_profile  *lprof;
3949         struct lu_site         *site;
3950         ENTRY;
3951
3952         /* in 1.8 we had the only device in the stack - MDS.
3953          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3954          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3955          * to generate names and setup MDT, MDD. MDT will be using
3956          * generated name to connect to MDD. for MDD the next device
3957          * will be LOD with name taken from so called "profile" which
3958          * is generated by mount_option line
3959          *
3960          * 1.8 MGS generates config. commands like this:
3961          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3962          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3963          * 2.0 MGS generates config. commands like this:
3964          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3965          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3966          *                    3:lustre-MDT0000-mdtlov  4:f
3967          *
3968          * we generate MDD name from MDT one, just replacing T with D
3969          *
3970          * after all the preparations, the logical equivalent will be
3971          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3972          *                    3:lustre-MDT0000-mdtlov  4:f
3973          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3974          *                    3:lustre-MDD0000  4:f
3975          *
3976          *  notice we build the stack from down to top: MDD first, then MDT */
3977
3978         name_size = MAX_OBD_NAME;
3979         uuid_size = MAX_OBD_NAME;
3980
3981         OBD_ALLOC(name, name_size);
3982         OBD_ALLOC(uuid, uuid_size);
3983         if (name == NULL || uuid == NULL)
3984                 GOTO(cleanup_mem, rc = -ENOMEM);
3985
3986         OBD_ALLOC_PTR(bufs);
3987         if (!bufs)
3988                 GOTO(cleanup_mem, rc = -ENOMEM);
3989
3990         strcpy(name, dev);
3991         p = strstr(name, "-MDT");
3992         if (p == NULL)
3993                 GOTO(free_bufs, rc = -ENOMEM);
3994         p[3] = 'D';
3995
3996         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3997
3998         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3999         if (lprof == NULL || lprof->lp_dt == NULL) {
4000                 CERROR("can't find the profile: %s\n",
4001                        lustre_cfg_string(cfg, 0));
4002                 GOTO(free_bufs, rc = -EINVAL);
4003         }
4004
4005         lustre_cfg_bufs_reset(bufs, name);
4006         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4007         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4008         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4009
4010         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4011         if (!lcfg)
4012                 GOTO(free_bufs, rc = -ENOMEM);
4013
4014         rc = class_attach(lcfg);
4015         if (rc)
4016                 GOTO(lcfg_cleanup, rc);
4017
4018         obd = class_name2obd(name);
4019         if (!obd) {
4020                 CERROR("Can not find obd %s (%s in config)\n",
4021                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4022                 GOTO(class_detach, rc = -EINVAL);
4023         }
4024
4025         lustre_cfg_free(lcfg);
4026
4027         lustre_cfg_bufs_reset(bufs, name);
4028         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4029         lustre_cfg_bufs_set_string(bufs, 2, dev);
4030         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4031
4032         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4033
4034         rc = class_setup(obd, lcfg);
4035         if (rc)
4036                 GOTO(class_detach, rc);
4037
4038         /* connect to MDD we just setup */
4039         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4040         if (rc)
4041                 GOTO(class_detach, rc);
4042
4043         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4044         LASSERT(site);
4045         LASSERT(mdt_lu_site(mdt) == NULL);
4046         mdt->mdt_lu_dev.ld_site = site;
4047         site->ls_top_dev = &mdt->mdt_lu_dev;
4048         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4049
4050         /* now connect to bottom OSD */
4051         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4052         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4053         if (rc)
4054                 GOTO(class_detach, rc);
4055         mdt->mdt_bottom =
4056                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4057
4058         rc = lu_env_refill((struct lu_env *)env);
4059         if (rc != 0)
4060                 CERROR("Failure to refill session: '%d'\n", rc);
4061
4062         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4063
4064         EXIT;
4065 class_detach:
4066         if (rc)
4067                 class_detach(obd, lcfg);
4068 lcfg_cleanup:
4069         lustre_cfg_free(lcfg);
4070 free_bufs:
4071         OBD_FREE_PTR(bufs);
4072 cleanup_mem:
4073         if (name)
4074                 OBD_FREE(name, name_size);
4075         if (uuid)
4076                 OBD_FREE(uuid, uuid_size);
4077         RETURN(rc);
4078 }
4079
4080 /* setup quota master target on MDT0 */
4081 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4082                           struct lustre_cfg *cfg)
4083 {
4084         struct obd_device       *obd;
4085         char                    *dev = lustre_cfg_string(cfg, 0);
4086         char                    *qmtname, *uuid, *p;
4087         struct lustre_cfg_bufs  *bufs;
4088         struct lustre_cfg       *lcfg;
4089         struct lustre_profile   *lprof;
4090         struct obd_connect_data *data;
4091         int                      rc;
4092         ENTRY;
4093
4094         LASSERT(mdt->mdt_qmt_exp == NULL);
4095         LASSERT(mdt->mdt_qmt_dev == NULL);
4096
4097         /* quota master is on MDT0 only for now */
4098         if (mdt->mdt_seq_site.ss_node_id != 0)
4099                 RETURN(0);
4100
4101         /* MGS generates config commands which look as follows:
4102          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4103          *                    3:lustre-MDT0000-mdtlov  4:f
4104          *
4105          * We generate the QMT name from the MDT one, just replacing MD with QM
4106          * after all the preparations, the logical equivalent will be:
4107          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4108          *                    3:lustre-MDT0000-osd  4:f */
4109         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4110         OBD_ALLOC(uuid, UUID_MAX);
4111         OBD_ALLOC_PTR(bufs);
4112         OBD_ALLOC_PTR(data);
4113         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4114                 GOTO(cleanup_mem, rc = -ENOMEM);
4115
4116         strcpy(qmtname, dev);
4117         p = strstr(qmtname, "-MDT");
4118         if (p == NULL)
4119                 GOTO(cleanup_mem, rc = -ENOMEM);
4120         /* replace MD with QM */
4121         p[1] = 'Q';
4122         p[2] = 'M';
4123
4124         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4125
4126         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4127         if (lprof == NULL || lprof->lp_dt == NULL) {
4128                 CERROR("can't find profile for %s\n",
4129                        lustre_cfg_string(cfg, 0));
4130                 GOTO(cleanup_mem, rc = -EINVAL);
4131         }
4132
4133         lustre_cfg_bufs_reset(bufs, qmtname);
4134         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4135         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4136         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4137
4138         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4139         if (!lcfg)
4140                 GOTO(cleanup_mem, rc = -ENOMEM);
4141
4142         rc = class_attach(lcfg);
4143         if (rc)
4144                 GOTO(lcfg_cleanup, rc);
4145
4146         obd = class_name2obd(qmtname);
4147         if (!obd) {
4148                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4149                        lustre_cfg_string(cfg, 0));
4150                 GOTO(class_detach, rc = -EINVAL);
4151         }
4152
4153         lustre_cfg_free(lcfg);
4154
4155         lustre_cfg_bufs_reset(bufs, qmtname);
4156         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4157         lustre_cfg_bufs_set_string(bufs, 2, dev);
4158
4159         /* for quota, the next device should be the OSD device */
4160         lustre_cfg_bufs_set_string(bufs, 3,
4161                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4162
4163         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4164
4165         rc = class_setup(obd, lcfg);
4166         if (rc)
4167                 GOTO(class_detach, rc);
4168
4169         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4170
4171         /* configure local quota objects */
4172         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4173                                                    &mdt->mdt_lu_dev,
4174                                                    mdt->mdt_qmt_dev);
4175         if (rc)
4176                 GOTO(class_cleanup, rc);
4177
4178         /* connect to quota master target */
4179         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4180         data->ocd_version = LUSTRE_VERSION_CODE;
4181         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4182                          data, NULL);
4183         if (rc) {
4184                 CERROR("cannot connect to quota master device %s (%d)\n",
4185                        qmtname, rc);
4186                 GOTO(class_cleanup, rc);
4187         }
4188
4189         EXIT;
4190 class_cleanup:
4191         if (rc) {
4192                 class_manual_cleanup(obd);
4193                 mdt->mdt_qmt_dev = NULL;
4194         }
4195 class_detach:
4196         if (rc)
4197                 class_detach(obd, lcfg);
4198 lcfg_cleanup:
4199         lustre_cfg_free(lcfg);
4200 cleanup_mem:
4201         if (bufs)
4202                 OBD_FREE_PTR(bufs);
4203         if (qmtname)
4204                 OBD_FREE(qmtname, MAX_OBD_NAME);
4205         if (uuid)
4206                 OBD_FREE(uuid, UUID_MAX);
4207         if (data)
4208                 OBD_FREE_PTR(data);
4209         return rc;
4210 }
4211
4212 /* Shutdown quota master target associated with mdt */
4213 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4214 {
4215         ENTRY;
4216
4217         if (mdt->mdt_qmt_exp == NULL)
4218                 RETURN_EXIT;
4219         LASSERT(mdt->mdt_qmt_dev != NULL);
4220
4221         /* the qmt automatically shuts down when the mdt disconnects */
4222         obd_disconnect(mdt->mdt_qmt_exp);
4223         mdt->mdt_qmt_exp = NULL;
4224         mdt->mdt_qmt_dev = NULL;
4225         EXIT;
4226 }
4227
4228 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4229  * for now. This will be removed along with converting rest of MDT code
4230  * to use tgt_session_info */
4231 int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4232 {
4233         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4234         int                      rc;
4235
4236         rc = mdt_getxattr(info);
4237
4238         mdt_thread_info_fini(info);
4239         return rc;
4240 }
4241
4242 static struct tgt_handler mdt_tgt_handlers[] = {
4243 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4244                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4245                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4246 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4247                 0,                      MDS_DISCONNECT, tgt_disconnect,
4248                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4249 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4250                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4251                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4252 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4253 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
4254 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4255 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4256                                                         mdt_getattr_name),
4257 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4258 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4259 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4260 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4261 TGT_MDT_HDL(HABEO_CORPUS,               MDS_DONE_WRITING,
4262                                                         mdt_done_writing),
4263 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4264 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4265 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_IS_SUBDIR,  mdt_is_subdir),
4266 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4267 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4268                                                         mdt_hsm_progress),
4269 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4270                                                         mdt_hsm_ct_register),
4271 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4272                                                         mdt_hsm_ct_unregister),
4273 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4274                                                         mdt_hsm_state_get),
4275 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4276                                                         mdt_hsm_state_set),
4277 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4278 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4279                                                         mdt_hsm_request),
4280 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4281             MDS_SWAP_LAYOUTS,
4282             mdt_swap_layouts),
4283 };
4284
4285 static struct tgt_handler mdt_sec_ctx_ops[] = {
4286 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4287 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4288 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4289 };
4290
4291 static struct tgt_handler mdt_quota_ops[] = {
4292 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4293 };
4294
4295 static struct tgt_opc_slice mdt_common_slice[] = {
4296         {
4297                 .tos_opc_start  = MDS_FIRST_OPC,
4298                 .tos_opc_end    = MDS_LAST_OPC,
4299                 .tos_hs         = mdt_tgt_handlers
4300         },
4301         {
4302                 .tos_opc_start  = OBD_FIRST_OPC,
4303                 .tos_opc_end    = OBD_LAST_OPC,
4304                 .tos_hs         = tgt_obd_handlers
4305         },
4306         {
4307                 .tos_opc_start  = LDLM_FIRST_OPC,
4308                 .tos_opc_end    = LDLM_LAST_OPC,
4309                 .tos_hs         = tgt_dlm_handlers
4310         },
4311         {
4312                 .tos_opc_start  = SEC_FIRST_OPC,
4313                 .tos_opc_end    = SEC_LAST_OPC,
4314                 .tos_hs         = mdt_sec_ctx_ops
4315         },
4316         {
4317                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4318                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4319                 .tos_hs         = tgt_out_handlers
4320         },
4321         {
4322                 .tos_opc_start  = FLD_FIRST_OPC,
4323                 .tos_opc_end    = FLD_LAST_OPC,
4324                 .tos_hs         = fld_handlers
4325         },
4326         {
4327                 .tos_opc_start  = SEQ_FIRST_OPC,
4328                 .tos_opc_end    = SEQ_LAST_OPC,
4329                 .tos_hs         = seq_handlers
4330         },
4331         {
4332                 .tos_opc_start  = QUOTA_DQACQ,
4333                 .tos_opc_end    = QUOTA_LAST_OPC,
4334                 .tos_hs         = mdt_quota_ops
4335         },
4336         {
4337                 .tos_opc_start  = LLOG_FIRST_OPC,
4338                 .tos_opc_end    = LLOG_LAST_OPC,
4339                 .tos_hs         = tgt_llog_handlers
4340         },
4341         {
4342                 .tos_opc_start  = LFSCK_FIRST_OPC,
4343                 .tos_opc_end    = LFSCK_LAST_OPC,
4344                 .tos_hs         = tgt_lfsck_handlers
4345         },
4346
4347         {
4348                 .tos_hs         = NULL
4349         }
4350 };
4351
4352 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4353 {
4354         struct md_device        *next = m->mdt_child;
4355         struct lu_device        *d    = &m->mdt_lu_dev;
4356         struct obd_device       *obd  = mdt2obd_dev(m);
4357         struct lfsck_stop        stop;
4358         ENTRY;
4359
4360         stop.ls_status = LS_PAUSED;
4361         stop.ls_flags = 0;
4362         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4363
4364         target_recovery_fini(obd);
4365         ping_evictor_stop();
4366         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4367
4368         if (m->mdt_opts.mo_coordinator)
4369                 mdt_hsm_cdt_stop(m);
4370
4371         mdt_hsm_cdt_fini(m);
4372
4373         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4374         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4375         obd_exports_barrier(obd);
4376         obd_zombie_barrier();
4377
4378         mdt_procfs_fini(m);
4379
4380         tgt_fini(env, &m->mdt_lut);
4381         mdt_fs_cleanup(env, m);
4382         upcall_cache_cleanup(m->mdt_identity_cache);
4383         m->mdt_identity_cache = NULL;
4384
4385         if (m->mdt_namespace != NULL) {
4386                 ldlm_namespace_free(m->mdt_namespace, NULL,
4387                                     d->ld_obd->obd_force);
4388                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4389         }
4390
4391         mdt_quota_fini(env, m);
4392
4393         cfs_free_nidlist(&m->mdt_nosquash_nids);
4394         if (m->mdt_nosquash_str) {
4395                 OBD_FREE(m->mdt_nosquash_str, m->mdt_nosquash_strlen);
4396                 m->mdt_nosquash_str = NULL;
4397                 m->mdt_nosquash_strlen = 0;
4398         }
4399
4400         mdt_seq_fini(env, m);
4401         mdt_fld_fini(env, m);
4402
4403         next->md_ops->mdo_init_capa_ctxt(env, next, 0, 0, 0, NULL);
4404         cfs_timer_disarm(&m->mdt_ck_timer);
4405         mdt_ck_thread_stop(m);
4406
4407         /*
4408          * Finish the stack
4409          */
4410         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4411
4412         LASSERT(atomic_read(&d->ld_ref) == 0);
4413
4414         server_put_mount(mdt_obd_name(m));
4415
4416         EXIT;
4417 }
4418
4419 int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4420
4421 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4422                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4423 {
4424         struct mdt_thread_info    *info;
4425         struct obd_device         *obd;
4426         const char                *dev = lustre_cfg_string(cfg, 0);
4427         const char                *num = lustre_cfg_string(cfg, 2);
4428         struct lustre_mount_info  *lmi = NULL;
4429         struct lustre_sb_info     *lsi;
4430         struct lu_site            *s;
4431         struct seq_server_site    *ss_site;
4432         const char                *identity_upcall = "NONE";
4433         struct md_device          *next;
4434         int                        rc;
4435         long                       node_id;
4436         mntopt_t                   mntopts;
4437         ENTRY;
4438
4439         lu_device_init(&m->mdt_lu_dev, ldt);
4440         /*
4441          * Environment (env) might be missing mdt_thread_key values at that
4442          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4443          * mode.
4444          *
4445          * Usually device allocation path doesn't use module key values, but
4446          * mdt has to do a lot of work here, so allocate key value.
4447          */
4448         rc = lu_env_refill((struct lu_env *)env);
4449         if (rc != 0)
4450                 RETURN(rc);
4451
4452         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4453         LASSERT(info != NULL);
4454
4455         obd = class_name2obd(dev);
4456         LASSERT(obd != NULL);
4457
4458         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4459
4460         m->mdt_som_conf = 0;
4461
4462         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4463
4464         /* default is coordinator off, it is started through conf_param
4465          * or /proc */
4466         m->mdt_opts.mo_coordinator = 0;
4467
4468         lmi = server_get_mount(dev);
4469         if (lmi == NULL) {
4470                 CERROR("Cannot get mount info for %s!\n", dev);
4471                 RETURN(-EFAULT);
4472         } else {
4473                 lsi = s2lsi(lmi->lmi_sb);
4474                 /* CMD is supported only in IAM mode */
4475                 LASSERT(num);
4476                 node_id = simple_strtol(num, NULL, 10);
4477                 obd->u.obt.obt_magic = OBT_MAGIC;
4478         }
4479
4480         spin_lock_init(&m->mdt_ioepoch_lock);
4481         m->mdt_capa_timeout = CAPA_TIMEOUT;
4482         m->mdt_capa_alg = CAPA_HMAC_ALG_SHA1;
4483         m->mdt_ck_timeout = CAPA_KEY_TIMEOUT;
4484         m->mdt_squash_uid = 0;
4485         m->mdt_squash_gid = 0;
4486         CFS_INIT_LIST_HEAD(&m->mdt_nosquash_nids);
4487         m->mdt_nosquash_str = NULL;
4488         m->mdt_nosquash_strlen = 0;
4489         init_rwsem(&m->mdt_squash_sem);
4490         spin_lock_init(&m->mdt_osfs_lock);
4491         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4492         m->mdt_enable_remote_dir = 0;
4493         m->mdt_enable_remote_dir_gid = 0;
4494
4495         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4496         m->mdt_lu_dev.ld_obd = obd;
4497         /* Set this lu_device to obd for error handling purposes. */
4498         obd->obd_lu_dev = &m->mdt_lu_dev;
4499
4500         /* init the stack */
4501         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4502         if (rc) {
4503                 CERROR("%s: Can't init device stack, rc %d\n",
4504                        mdt_obd_name(m), rc);
4505                 GOTO(err_lmi, rc);
4506         }
4507
4508         s = mdt_lu_site(m);
4509         ss_site = mdt_seq_site(m);
4510         s->ld_seq_site = ss_site;
4511         ss_site->ss_lu = s;
4512
4513         /* set server index */
4514         ss_site->ss_node_id = node_id;
4515
4516         /* failover is the default
4517          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4518          * assumed whose ss_node_id == 0 XXX
4519          * */
4520         obd->obd_replayable = 1;
4521         /* No connection accepted until configurations will finish */
4522         obd->obd_no_conn = 1;
4523
4524         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4525                 char *str = lustre_cfg_string(cfg, 4);
4526                 if (strchr(str, 'n')) {
4527                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4528                         obd->obd_replayable = 0;
4529                 }
4530         }
4531
4532         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4533         if (rc)
4534                 GOTO(err_fini_stack, rc);
4535
4536         rc = mdt_seq_init(env, m);
4537         if (rc)
4538                 GOTO(err_fini_fld, rc);
4539
4540         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4541                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4542         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4543                                               LDLM_NAMESPACE_SERVER,
4544                                               LDLM_NAMESPACE_GREEDY,
4545                                               LDLM_NS_TYPE_MDT);
4546         if (m->mdt_namespace == NULL)
4547                 GOTO(err_fini_seq, rc = -ENOMEM);
4548
4549         m->mdt_namespace->ns_lvbp = m;
4550         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4551
4552         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4553         /* set obd_namespace for compatibility with old code */
4554         obd->obd_namespace = m->mdt_namespace;
4555
4556         cfs_timer_init(&m->mdt_ck_timer, mdt_ck_timer_callback, m);
4557
4558         rc = mdt_hsm_cdt_init(m);
4559         if (rc != 0) {
4560                 CERROR("%s: error initializing coordinator, rc %d\n",
4561                        mdt_obd_name(m), rc);
4562                 GOTO(err_free_ns, rc);
4563         }
4564
4565         rc = mdt_ck_thread_start(m);
4566         if (rc)
4567                 GOTO(err_free_hsm, rc);
4568
4569         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4570                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4571                       OBD_FAIL_MDS_ALL_REPLY_NET);
4572         if (rc)
4573                 GOTO(err_capa, rc);
4574
4575         rc = mdt_fs_setup(env, m, obd, lsi);
4576         if (rc)
4577                 GOTO(err_tgt, rc);
4578
4579         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4580
4581         next = m->mdt_child;
4582         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4583                                          &mntopts);
4584         if (rc)
4585                 GOTO(err_fs_cleanup, rc);
4586
4587         if (mntopts & MNTOPT_USERXATTR)
4588                 m->mdt_opts.mo_user_xattr = 1;
4589         else
4590                 m->mdt_opts.mo_user_xattr = 0;
4591
4592         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4593         if (rc)
4594                 GOTO(err_fs_cleanup, rc);
4595
4596         if (mntopts & MNTOPT_ACL)
4597                 m->mdt_opts.mo_acl = 1;
4598         else
4599                 m->mdt_opts.mo_acl = 0;
4600
4601         /* XXX: to support suppgid for ACL, we enable identity_upcall
4602          * by default, otherwise, maybe got unexpected -EACCESS. */
4603         if (m->mdt_opts.mo_acl)
4604                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4605
4606         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4607                                                 identity_upcall,
4608                                                 &mdt_identity_upcall_cache_ops);
4609         if (IS_ERR(m->mdt_identity_cache)) {
4610                 rc = PTR_ERR(m->mdt_identity_cache);
4611                 m->mdt_identity_cache = NULL;
4612                 GOTO(err_fs_cleanup, rc);
4613         }
4614
4615         rc = mdt_procfs_init(m, dev);
4616         if (rc) {
4617                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4618                 GOTO(err_recovery, rc);
4619         }
4620
4621         rc = mdt_quota_init(env, m, cfg);
4622         if (rc)
4623                 GOTO(err_procfs, rc);
4624
4625         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4626         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4627                            "mdt_ldlm_client", m->mdt_ldlm_client);
4628
4629         ping_evictor_start();
4630
4631         /* recovery will be started upon mdt_prepare()
4632          * when the whole stack is complete and ready
4633          * to serve the requests */
4634
4635         mdt_init_capa_ctxt(env, m);
4636
4637         /* Reduce the initial timeout on an MDS because it doesn't need such
4638          * a long timeout as an OST does. Adaptive timeouts will adjust this
4639          * value appropriately. */
4640         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4641                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4642
4643         RETURN(0);
4644 err_procfs:
4645         mdt_procfs_fini(m);
4646 err_recovery:
4647         target_recovery_fini(obd);
4648         upcall_cache_cleanup(m->mdt_identity_cache);
4649         m->mdt_identity_cache = NULL;
4650 err_fs_cleanup:
4651         mdt_fs_cleanup(env, m);
4652 err_tgt:
4653         tgt_fini(env, &m->mdt_lut);
4654 err_capa:
4655         cfs_timer_disarm(&m->mdt_ck_timer);
4656         mdt_ck_thread_stop(m);
4657 err_free_hsm:
4658         mdt_hsm_cdt_fini(m);
4659 err_free_ns:
4660         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4661         obd->obd_namespace = m->mdt_namespace = NULL;
4662 err_fini_seq:
4663         mdt_seq_fini(env, m);
4664 err_fini_fld:
4665         mdt_fld_fini(env, m);
4666 err_fini_stack:
4667         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4668 err_lmi:
4669         if (lmi)
4670                 server_put_mount(dev);
4671         return(rc);
4672 }
4673
4674 /* For interoperability, the left element is old parameter, the right one
4675  * is the new version of the parameter, if some parameter is deprecated,
4676  * the new version should be set as NULL. */
4677 static struct cfg_interop_param mdt_interop_param[] = {
4678         { "mdt.group_upcall",   NULL },
4679         { "mdt.quota_type",     NULL },
4680         { "mdd.quota_type",     NULL },
4681         { "mdt.rootsquash",     "mdt.root_squash" },
4682         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4683         { NULL }
4684 };
4685
4686 /* used by MGS to process specific configurations */
4687 static int mdt_process_config(const struct lu_env *env,
4688                               struct lu_device *d, struct lustre_cfg *cfg)
4689 {
4690         struct mdt_device *m = mdt_dev(d);
4691         struct md_device *md_next = m->mdt_child;
4692         struct lu_device *next = md2lu_dev(md_next);
4693         int rc;
4694         ENTRY;
4695
4696         switch (cfg->lcfg_command) {
4697         case LCFG_PARAM: {
4698                 struct lprocfs_static_vars  lvars;
4699                 struct obd_device          *obd = d->ld_obd;
4700
4701                 /* For interoperability */
4702                 struct cfg_interop_param   *ptr = NULL;
4703                 struct lustre_cfg          *old_cfg = NULL;
4704                 char                       *param = NULL;
4705
4706                 param = lustre_cfg_string(cfg, 1);
4707                 if (param == NULL) {
4708                         CERROR("param is empty\n");
4709                         rc = -EINVAL;
4710                         break;
4711                 }
4712
4713                 ptr = class_find_old_param(param, mdt_interop_param);
4714                 if (ptr != NULL) {
4715                         if (ptr->new_param == NULL) {
4716                                 rc = 0;
4717                                 CWARN("For interoperability, skip this %s."
4718                                       " It is obsolete.\n", ptr->old_param);
4719                                 break;
4720                         }
4721
4722                         CWARN("Found old param %s, changed it to %s.\n",
4723                               ptr->old_param, ptr->new_param);
4724
4725                         old_cfg = cfg;
4726                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4727                         if (IS_ERR(cfg)) {
4728                                 rc = PTR_ERR(cfg);
4729                                 break;
4730                         }
4731                 }
4732
4733                 lprocfs_mdt_init_vars(&lvars);
4734                 rc = class_process_proc_param(PARAM_MDT, lvars.obd_vars,
4735                                               cfg, obd);
4736                 if (rc > 0 || rc == -ENOSYS) {
4737                         /* is it an HSM var ? */
4738                         rc = class_process_proc_param(PARAM_HSM,
4739                                                       hsm_cdt_get_proc_vars(),
4740                                                       cfg, obd);
4741                         if (rc > 0 || rc == -ENOSYS)
4742                                 /* we don't understand; pass it on */
4743                                 rc = next->ld_ops->ldo_process_config(env, next,
4744                                                                       cfg);
4745                 }
4746
4747                 if (old_cfg != NULL)
4748                         lustre_cfg_free(cfg);
4749
4750                 break;
4751         }
4752         default:
4753                 /* others are passed further */
4754                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4755                 break;
4756         }
4757         RETURN(rc);
4758 }
4759
4760 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4761                                           const struct lu_object_header *hdr,
4762                                           struct lu_device *d)
4763 {
4764         struct mdt_object *mo;
4765
4766         ENTRY;
4767
4768         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4769         if (mo != NULL) {
4770                 struct lu_object *o;
4771                 struct lu_object_header *h;
4772
4773                 o = &mo->mot_obj;
4774                 h = &mo->mot_header;
4775                 lu_object_header_init(h);
4776                 lu_object_init(o, h, d);
4777                 lu_object_add_top(h, o);
4778                 o->lo_ops = &mdt_obj_ops;
4779                 mutex_init(&mo->mot_ioepoch_mutex);
4780                 mutex_init(&mo->mot_lov_mutex);
4781                 init_rwsem(&mo->mot_open_sem);
4782                 RETURN(o);
4783         }
4784         RETURN(NULL);
4785 }
4786
4787 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4788                            const struct lu_object_conf *unused)
4789 {
4790         struct mdt_device *d = mdt_dev(o->lo_dev);
4791         struct lu_device  *under;
4792         struct lu_object  *below;
4793         int                rc = 0;
4794         ENTRY;
4795
4796         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4797                PFID(lu_object_fid(o)));
4798
4799         under = &d->mdt_child->md_lu_dev;
4800         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4801         if (below != NULL) {
4802                 lu_object_add(o, below);
4803         } else
4804                 rc = -ENOMEM;
4805
4806         RETURN(rc);
4807 }
4808
4809 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4810 {
4811         struct mdt_object *mo = mdt_obj(o);
4812         struct lu_object_header *h;
4813         ENTRY;
4814
4815         h = o->lo_header;
4816         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4817                PFID(lu_object_fid(o)));
4818
4819         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4820         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4821
4822         lu_object_fini(o);
4823         lu_object_header_fini(h);
4824         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4825
4826         EXIT;
4827 }
4828
4829 static int mdt_object_print(const struct lu_env *env, void *cookie,
4830                             lu_printer_t p, const struct lu_object *o)
4831 {
4832         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4833         return (*p)(env, cookie, LUSTRE_MDT_NAME"-object@%p(ioepoch="LPU64" "
4834                     "flags="LPX64", epochcount=%d, writecount=%d)",
4835                     mdto, mdto->mot_ioepoch, mdto->mot_flags,
4836                     mdto->mot_ioepoch_count, mdto->mot_writecount);
4837 }
4838
4839 static int mdt_prepare(const struct lu_env *env,
4840                 struct lu_device *pdev,
4841                 struct lu_device *cdev)
4842 {
4843         struct mdt_device *mdt = mdt_dev(cdev);
4844         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4845         struct obd_device *obd = cdev->ld_obd;
4846         struct lfsck_start_param lsp;
4847         int rc;
4848
4849         ENTRY;
4850
4851         LASSERT(obd);
4852
4853         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4854         if (rc)
4855                 RETURN(rc);
4856
4857         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4858         if (rc)
4859                 RETURN(rc);
4860
4861         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4862         if (rc)
4863                 RETURN(rc);
4864
4865         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4866         /* The LFSCK instance is registered just now, so it must be there when
4867          * register the namespace to such instance. */
4868         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4869
4870         lsp.lsp_start = NULL;
4871         lsp.lsp_index_valid = 0;
4872         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
4873                                                    OBD_IOC_START_LFSCK,
4874                                                    0, &lsp);
4875         if (rc != 0) {
4876                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
4877                       mdt_obd_name(mdt), rc);
4878                 rc = 0;
4879         }
4880
4881         if (mdt->mdt_seq_site.ss_node_id == 0) {
4882                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4883                                                          &mdt->mdt_md_root_fid);
4884                 if (rc)
4885                         RETURN(rc);
4886         }
4887
4888         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4889         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4890         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4891         LASSERT(obd->obd_no_conn);
4892         spin_lock(&obd->obd_dev_lock);
4893         obd->obd_no_conn = 0;
4894         spin_unlock(&obd->obd_dev_lock);
4895
4896         if (obd->obd_recovering == 0)
4897                 mdt_postrecov(env, mdt);
4898
4899         RETURN(rc);
4900 }
4901
4902 const struct lu_device_operations mdt_lu_ops = {
4903         .ldo_object_alloc   = mdt_object_alloc,
4904         .ldo_process_config = mdt_process_config,
4905         .ldo_prepare        = mdt_prepare,
4906 };
4907
4908 static const struct lu_object_operations mdt_obj_ops = {
4909         .loo_object_init    = mdt_object_init,
4910         .loo_object_free    = mdt_object_free,
4911         .loo_object_print   = mdt_object_print
4912 };
4913
4914 static int mdt_obd_set_info_async(const struct lu_env *env,
4915                                   struct obd_export *exp,
4916                                   __u32 keylen, void *key,
4917                                   __u32 vallen, void *val,
4918                                   struct ptlrpc_request_set *set)
4919 {
4920         int rc;
4921
4922         ENTRY;
4923
4924         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4925                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4926                 RETURN(rc);
4927         }
4928
4929         RETURN(0);
4930 }
4931
4932 /**
4933  * Match client and server connection feature flags.
4934  *
4935  * Compute the compatibility flags for a connection request based on
4936  * features mutually supported by client and server.
4937  *
4938  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4939  * must not be updated here, otherwise a partially initialized value may
4940  * be exposed. After the connection request is successfully processed,
4941  * the top-level MDT connect request handler atomically updates the export
4942  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4943  * reply. \see mdt_connect().
4944  *
4945  * \param exp   the obd_export associated with this client/target pair
4946  * \param mdt   the target device for the connection
4947  * \param data  stores data for this connect request
4948  *
4949  * \retval 0       success
4950  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4951  * \retval -EBADE  client and server feature requirements are incompatible
4952  */
4953 static int mdt_connect_internal(struct obd_export *exp,
4954                                 struct mdt_device *mdt,
4955                                 struct obd_connect_data *data)
4956 {
4957         LASSERT(data != NULL);
4958
4959         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4960         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4961
4962         /* If no known bits (which should not happen, probably,
4963            as everybody should support LOOKUP and UPDATE bits at least)
4964            revert to compat mode with plain locks. */
4965         if (!data->ocd_ibits_known &&
4966             data->ocd_connect_flags & OBD_CONNECT_IBITS)
4967                 data->ocd_connect_flags &= ~OBD_CONNECT_IBITS;
4968
4969         if (!mdt->mdt_opts.mo_acl)
4970                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4971
4972         if (!mdt->mdt_opts.mo_user_xattr)
4973                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4974
4975         if (!mdt->mdt_som_conf)
4976                 data->ocd_connect_flags &= ~OBD_CONNECT_SOM;
4977
4978         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4979                 data->ocd_brw_size = min(data->ocd_brw_size,
4980                                          (__u32)MD_MAX_BRW_SIZE);
4981                 if (data->ocd_brw_size == 0) {
4982                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4983                                " ocd_version: %x ocd_grant: %d "
4984                                "ocd_index: %u ocd_brw_size is "
4985                                "unexpectedly zero, network data "
4986                                "corruption? Refusing connection of this"
4987                                " client\n",
4988                                mdt_obd_name(mdt),
4989                                exp->exp_client_uuid.uuid,
4990                                exp, data->ocd_connect_flags, data->ocd_version,
4991                                data->ocd_grant, data->ocd_index);
4992                         return -EPROTO;
4993                 }
4994         }
4995
4996         /* NB: Disregard the rule against updating
4997          * exp_connect_data.ocd_connect_flags in this case, since
4998          * tgt_client_new() needs to know if this is a lightweight
4999          * connection, and it is safe to expose this flag before
5000          * connection processing completes. */
5001         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5002                 spin_lock(&exp->exp_lock);
5003                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5004                 spin_unlock(&exp->exp_lock);
5005         }
5006
5007         data->ocd_version = LUSTRE_VERSION_CODE;
5008
5009         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5010                 CWARN("%s: MDS requires FID support, but client not\n",
5011                       mdt_obd_name(mdt));
5012                 return -EBADE;
5013         }
5014
5015         if (mdt->mdt_som_conf &&
5016             !(data->ocd_connect_flags & (OBD_CONNECT_LIGHTWEIGHT |
5017                                          OBD_CONNECT_MDS_MDS |
5018                                          OBD_CONNECT_SOM))) {
5019                 CWARN("%s: MDS has SOM enabled, but client does not support "
5020                       "it\n", mdt_obd_name(mdt));
5021                 return -EBADE;
5022         }
5023
5024         if (OCD_HAS_FLAG(data, PINGLESS)) {
5025                 if (ptlrpc_pinger_suppress_pings()) {
5026                         spin_lock(&exp->exp_obd->obd_dev_lock);
5027                         list_del_init(&exp->exp_obd_chain_timed);
5028                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5029                 } else {
5030                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5031                 }
5032         }
5033
5034         data->ocd_max_easize = mdt->mdt_max_ea_size;
5035
5036         return 0;
5037 }
5038
5039 /* mds_connect copy */
5040 static int mdt_obd_connect(const struct lu_env *env,
5041                            struct obd_export **exp, struct obd_device *obd,
5042                            struct obd_uuid *cluuid,
5043                            struct obd_connect_data *data,
5044                            void *localdata)
5045 {
5046         struct obd_export      *lexp;
5047         struct lustre_handle    conn = { 0 };
5048         struct mdt_device      *mdt;
5049         int                     rc;
5050         ENTRY;
5051
5052         LASSERT(env != NULL);
5053         if (!exp || !obd || !cluuid)
5054                 RETURN(-EINVAL);
5055
5056         mdt = mdt_dev(obd->obd_lu_dev);
5057
5058         /*
5059          * first, check whether the stack is ready to handle requests
5060          * XXX: probably not very appropriate method is used now
5061          *      at some point we should find a better one
5062          */
5063         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
5064             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5065                 rc = obd_get_info(env, mdt->mdt_child_exp,
5066                                   sizeof(KEY_OSP_CONNECTED),
5067                                   KEY_OSP_CONNECTED, NULL, NULL, NULL);
5068                 if (rc)
5069                         RETURN(-EAGAIN);
5070                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5071         }
5072
5073         rc = class_connect(&conn, obd, cluuid);
5074         if (rc)
5075                 RETURN(rc);
5076
5077         lexp = class_conn2export(&conn);
5078         LASSERT(lexp != NULL);
5079
5080         rc = mdt_connect_internal(lexp, mdt, data);
5081         if (rc == 0) {
5082                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5083
5084                 LASSERT(lcd);
5085                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5086                 rc = tgt_client_new(env, lexp);
5087                 if (rc == 0)
5088                         mdt_export_stats_init(obd, lexp, localdata);
5089
5090                 /* For phase I, sync for cross-ref operation. */
5091                 lexp->exp_keep_sync = 1;
5092         }
5093
5094         if (rc != 0) {
5095                 class_disconnect(lexp);
5096                 *exp = NULL;
5097         } else {
5098                 *exp = lexp;
5099         }
5100
5101         RETURN(rc);
5102 }
5103
5104 static int mdt_obd_reconnect(const struct lu_env *env,
5105                              struct obd_export *exp, struct obd_device *obd,
5106                              struct obd_uuid *cluuid,
5107                              struct obd_connect_data *data,
5108                              void *localdata)
5109 {
5110         int                     rc;
5111         ENTRY;
5112
5113         if (exp == NULL || obd == NULL || cluuid == NULL)
5114                 RETURN(-EINVAL);
5115
5116         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5117         if (rc == 0)
5118                 mdt_export_stats_init(obd, exp, localdata);
5119
5120         RETURN(rc);
5121 }
5122
5123 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5124                                    struct mdt_thread_info *info,
5125                                    struct mdt_file_data *mfd)
5126 {
5127         struct lu_context ses;
5128         int rc;
5129         ENTRY;
5130
5131         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5132         if (rc)
5133                 RETURN(rc);
5134
5135         env->le_ses = &ses;
5136         lu_context_enter(&ses);
5137
5138         mdt_ucred(info)->uc_valid = UCRED_OLD;
5139         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5140
5141         lu_context_exit(&ses);
5142         lu_context_fini(&ses);
5143         env->le_ses = NULL;
5144
5145         RETURN(rc);
5146 }
5147
5148 static int mdt_export_cleanup(struct obd_export *exp)
5149 {
5150         struct mdt_export_data *med = &exp->exp_mdt_data;
5151         struct obd_device      *obd = exp->exp_obd;
5152         struct mdt_device      *mdt;
5153         struct mdt_thread_info *info;
5154         struct lu_env           env;
5155         CFS_LIST_HEAD(closing_list);
5156         struct mdt_file_data *mfd, *n;
5157         int rc = 0;
5158         ENTRY;
5159
5160         spin_lock(&med->med_open_lock);
5161         while (!cfs_list_empty(&med->med_open_head)) {
5162                 cfs_list_t *tmp = med->med_open_head.next;
5163                 mfd = cfs_list_entry(tmp, struct mdt_file_data, mfd_list);
5164
5165                 /* Remove mfd handle so it can't be found again.
5166                  * We are consuming the mfd_list reference here. */
5167                 class_handle_unhash(&mfd->mfd_handle);
5168                 cfs_list_move_tail(&mfd->mfd_list, &closing_list);
5169         }
5170         spin_unlock(&med->med_open_lock);
5171         mdt = mdt_dev(obd->obd_lu_dev);
5172         LASSERT(mdt != NULL);
5173
5174         rc = lu_env_init(&env, LCT_MD_THREAD);
5175         if (rc)
5176                 RETURN(rc);
5177
5178         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5179         LASSERT(info != NULL);
5180         memset(info, 0, sizeof *info);
5181         info->mti_env = &env;
5182         info->mti_mdt = mdt;
5183         info->mti_exp = exp;
5184
5185         if (!cfs_list_empty(&closing_list)) {
5186                 struct md_attr *ma = &info->mti_attr;
5187
5188                 /* Close any open files (which may also cause orphan unlinking). */
5189                 cfs_list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5190                         cfs_list_del_init(&mfd->mfd_list);
5191                         ma->ma_need = ma->ma_valid = 0;
5192
5193                         /* This file is being closed due to an eviction, it
5194                          * could have been modified and now dirty regarding to
5195                          * HSM archive, check this!
5196                          * The logic here is to mark a file dirty if there's a
5197                          * chance it was dirtied before the client was evicted,
5198                          * so that we don't have to wait for a release attempt
5199                          * before finding out the file was actually dirty and
5200                          * fail the release. Aggressively marking it dirty here
5201                          * will cause the policy engine to attempt to
5202                          * re-archive it; when rearchiving, we can compare the
5203                          * current version to the HSM data_version and make the
5204                          * archive request into a noop if it's not actually
5205                          * dirty.
5206                          */
5207                         if (mfd->mfd_mode & (FMODE_WRITE|MDS_FMODE_TRUNC))
5208                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5209
5210                         /* Don't unlink orphan on failover umount, LU-184 */
5211                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
5212                                 ma->ma_valid = MA_FLAGS;
5213                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5214                         }
5215                         mdt_mfd_close(info, mfd);
5216                 }
5217         }
5218         info->mti_mdt = NULL;
5219         /* cleanup client slot early */
5220         /* Do not erase record for recoverable client. */
5221         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
5222                 tgt_client_del(&env, exp);
5223         lu_env_fini(&env);
5224
5225         RETURN(rc);
5226 }
5227
5228 static int mdt_obd_disconnect(struct obd_export *exp)
5229 {
5230         int rc;
5231         ENTRY;
5232
5233         LASSERT(exp);
5234         class_export_get(exp);
5235
5236         rc = server_disconnect_export(exp);
5237         if (rc != 0)
5238                 CDEBUG(D_IOCTL, "server disconnect error: %d\n", rc);
5239
5240         rc = mdt_export_cleanup(exp);
5241         class_export_put(exp);
5242         RETURN(rc);
5243 }
5244
5245 /* FIXME: Can we avoid using these two interfaces? */
5246 static int mdt_init_export(struct obd_export *exp)
5247 {
5248         struct mdt_export_data *med = &exp->exp_mdt_data;
5249         int                     rc;
5250         ENTRY;
5251
5252         CFS_INIT_LIST_HEAD(&med->med_open_head);
5253         spin_lock_init(&med->med_open_lock);
5254         mutex_init(&med->med_idmap_mutex);
5255         med->med_idmap = NULL;
5256         spin_lock(&exp->exp_lock);
5257         exp->exp_connecting = 1;
5258         spin_unlock(&exp->exp_lock);
5259
5260         /* self-export doesn't need client data and ldlm initialization */
5261         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5262                                      &exp->exp_client_uuid)))
5263                 RETURN(0);
5264
5265         rc = tgt_client_alloc(exp);
5266         if (rc)
5267                 GOTO(err, rc);
5268
5269         rc = ldlm_init_export(exp);
5270         if (rc)
5271                 GOTO(err_free, rc);
5272
5273         RETURN(rc);
5274
5275 err_free:
5276         tgt_client_free(exp);
5277 err:
5278         CERROR("%s: Failed to initialize export: rc = %d\n",
5279                exp->exp_obd->obd_name, rc);
5280         return rc;
5281 }
5282
5283 static int mdt_destroy_export(struct obd_export *exp)
5284 {
5285         ENTRY;
5286
5287         if (exp_connect_rmtclient(exp))
5288                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5289
5290         target_destroy_export(exp);
5291         /* destroy can be called from failed obd_setup, so
5292          * checking uuid is safer than obd_self_export */
5293         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5294                                      &exp->exp_client_uuid)))
5295                 RETURN(0);
5296
5297         ldlm_destroy_export(exp);
5298         tgt_client_free(exp);
5299
5300         LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
5301         LASSERT(cfs_list_empty(&exp->exp_mdt_data.med_open_head));
5302
5303         RETURN(0);
5304 }
5305
5306 /** The maximum depth that fid2path() will search.
5307  * This is limited only because we want to store the fids for
5308  * historical path lookup purposes.
5309  */
5310 #define MAX_PATH_DEPTH 100
5311
5312 /** mdt_path() lookup structure. */
5313 struct path_lookup_info {
5314         __u64                   pli_recno;      /**< history point */
5315         __u64                   pli_currec;     /**< current record */
5316         struct lu_fid           pli_fid;
5317         struct lu_fid           pli_fids[MAX_PATH_DEPTH]; /**< path, in fids */
5318         struct mdt_object       *pli_mdt_obj;
5319         char                    *pli_path;      /**< full path */
5320         int                     pli_pathlen;
5321         int                     pli_linkno;     /**< which hardlink to follow */
5322         int                     pli_fidcount;   /**< number of \a pli_fids */
5323 };
5324
5325 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5326                    struct linkea_data *ldata)
5327 {
5328         int rc;
5329
5330         LASSERT(ldata->ld_buf->lb_buf != NULL);
5331
5332         if (!mdt_object_exists(mdt_obj))
5333                 return -ENODATA;
5334
5335         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5336                           ldata->ld_buf, XATTR_NAME_LINK);
5337         if (rc == -ERANGE) {
5338                 /* Buf was too small, figure out what we need. */
5339                 lu_buf_free(ldata->ld_buf);
5340                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5341                                   ldata->ld_buf, XATTR_NAME_LINK);
5342                 if (rc < 0)
5343                         return rc;
5344                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5345                 if (ldata->ld_buf->lb_buf == NULL)
5346                         return -ENOMEM;
5347                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5348                                   ldata->ld_buf, XATTR_NAME_LINK);
5349         }
5350         if (rc < 0)
5351                 return rc;
5352
5353         return linkea_init(ldata);
5354 }
5355
5356 static int mdt_path_current(struct mdt_thread_info *info,
5357                             struct path_lookup_info *pli)
5358 {
5359         struct mdt_device       *mdt = info->mti_mdt;
5360         struct mdt_object       *mdt_obj;
5361         struct link_ea_header   *leh;
5362         struct link_ea_entry    *lee;
5363         struct lu_name          *tmpname = &info->mti_name;
5364         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5365         struct lu_buf           *buf = &info->mti_big_buf;
5366         char                    *ptr;
5367         int                     reclen;
5368         struct linkea_data      ldata = { 0 };
5369         int                     rc = 0;
5370         ENTRY;
5371
5372         /* temp buffer for path element, the buffer will be finally freed
5373          * in mdt_thread_info_fini */
5374         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5375         if (buf->lb_buf == NULL)
5376                 RETURN(-ENOMEM);
5377
5378         ldata.ld_buf = buf;
5379         ptr = pli->pli_path + pli->pli_pathlen - 1;
5380         *ptr = 0;
5381         --ptr;
5382         pli->pli_fidcount = 0;
5383         pli->pli_fids[0] = *(struct lu_fid *)mdt_object_fid(pli->pli_mdt_obj);
5384
5385         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5386          * so checking root_fid can only happen on MDT0. */
5387         while (!lu_fid_eq(&mdt->mdt_md_root_fid,
5388                           &pli->pli_fids[pli->pli_fidcount])) {
5389                 mdt_obj = mdt_object_find(info->mti_env, mdt,
5390                                           &pli->pli_fids[pli->pli_fidcount]);
5391                 if (IS_ERR(mdt_obj))
5392                         GOTO(out, rc = PTR_ERR(mdt_obj));
5393                 if (mdt_object_remote(mdt_obj)) {
5394                         mdt_object_put(info->mti_env, mdt_obj);
5395                         GOTO(remote_out, rc = -EREMOTE);
5396                 }
5397                 if (!mdt_object_exists(mdt_obj)) {
5398                         mdt_object_put(info->mti_env, mdt_obj);
5399                         GOTO(out, rc = -ENOENT);
5400                 }
5401
5402                 rc = mdt_links_read(info, mdt_obj, &ldata);
5403                 mdt_object_put(info->mti_env, mdt_obj);
5404                 if (rc != 0)
5405                         GOTO(out, rc);
5406
5407                 leh = buf->lb_buf;
5408                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5409                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5410                 /* If set, use link #linkno for path lookup, otherwise use
5411                    link #0.  Only do this for the final path element. */
5412                 if (pli->pli_fidcount == 0 &&
5413                     pli->pli_linkno < leh->leh_reccount) {
5414                         int count;
5415                         for (count = 0; count < pli->pli_linkno; count++) {
5416                                 lee = (struct link_ea_entry *)
5417                                      ((char *)lee + reclen);
5418                                 linkea_entry_unpack(lee, &reclen, tmpname,
5419                                                     tmpfid);
5420                         }
5421                         if (pli->pli_linkno < leh->leh_reccount - 1)
5422                                 /* indicate to user there are more links */
5423                                 pli->pli_linkno++;
5424                 }
5425
5426                 /* Pack the name in the end of the buffer */
5427                 ptr -= tmpname->ln_namelen;
5428                 if (ptr - 1 <= pli->pli_path)
5429                         GOTO(out, rc = -EOVERFLOW);
5430                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5431                 *(--ptr) = '/';
5432
5433                 /* Store the parent fid for historic lookup */
5434                 if (++pli->pli_fidcount >= MAX_PATH_DEPTH)
5435                         GOTO(out, rc = -EOVERFLOW);
5436                 pli->pli_fids[pli->pli_fidcount] = *tmpfid;
5437         }
5438
5439 remote_out:
5440         ptr++; /* skip leading / */
5441         memmove(pli->pli_path, ptr, pli->pli_path + pli->pli_pathlen - ptr);
5442
5443         EXIT;
5444 out:
5445         return rc;
5446 }
5447
5448 /* Returns the full path to this fid, as of changelog record recno. */
5449 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5450                     char *path, int pathlen, __u64 *recno, int *linkno,
5451                     struct lu_fid *fid)
5452 {
5453         struct mdt_device       *mdt = info->mti_mdt;
5454         struct path_lookup_info *pli;
5455         int                     tries = 3;
5456         int                     rc = -EAGAIN;
5457         ENTRY;
5458
5459         if (pathlen < 3)
5460                 RETURN(-EOVERFLOW);
5461
5462         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5463                 path[0] = '\0';
5464                 RETURN(0);
5465         }
5466
5467         OBD_ALLOC_PTR(pli);
5468         if (pli == NULL)
5469                 RETURN(-ENOMEM);
5470
5471         pli->pli_mdt_obj = obj;
5472         pli->pli_recno = *recno;
5473         pli->pli_path = path;
5474         pli->pli_pathlen = pathlen;
5475         pli->pli_linkno = *linkno;
5476
5477         /* Retry multiple times in case file is being moved */
5478         while (tries-- && rc == -EAGAIN)
5479                 rc = mdt_path_current(info, pli);
5480
5481         /* return the last resolved fids to the client, so the client will
5482          * build the left path on another MDT for remote object */
5483         *fid = pli->pli_fids[pli->pli_fidcount];
5484
5485         *recno = pli->pli_currec;
5486         /* Return next link index to caller */
5487         *linkno = pli->pli_linkno;
5488
5489         OBD_FREE_PTR(pli);
5490
5491         RETURN(rc);
5492 }
5493
5494 static int mdt_fid2path(struct mdt_thread_info *info,
5495                         struct getinfo_fid2path *fp)
5496 {
5497         struct mdt_device *mdt = info->mti_mdt;
5498         struct mdt_object *obj;
5499         int    rc;
5500         ENTRY;
5501
5502         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5503                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5504
5505         if (!fid_is_sane(&fp->gf_fid))
5506                 RETURN(-EINVAL);
5507
5508         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5509                 CWARN("%s: "DFID" is invalid, sequence should be "
5510                       ">= "LPX64"\n", mdt_obd_name(mdt),
5511                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5512                 RETURN(-EINVAL);
5513         }
5514
5515         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5516         if (obj == NULL || IS_ERR(obj)) {
5517                 CDEBUG(D_IOCTL, "no object "DFID": %ld\n", PFID(&fp->gf_fid),
5518                        PTR_ERR(obj));
5519                 RETURN(-EINVAL);
5520         }
5521
5522         if (mdt_object_remote(obj))
5523                 rc = -EREMOTE;
5524         else if (!mdt_object_exists(obj))
5525                 rc = -ENOENT;
5526         else
5527                 rc = 0;
5528
5529         if (rc < 0) {
5530                 mdt_object_put(info->mti_env, obj);
5531                 CDEBUG(D_IOCTL, "nonlocal object "DFID": %d\n",
5532                        PFID(&fp->gf_fid), rc);
5533                 RETURN(rc);
5534         }
5535
5536         rc = mdt_path(info, obj, fp->gf_path, fp->gf_pathlen, &fp->gf_recno,
5537                       &fp->gf_linkno, &fp->gf_fid);
5538
5539         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5540                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5541
5542         mdt_object_put(info->mti_env, obj);
5543
5544         RETURN(rc);
5545 }
5546
5547 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5548                             void *val, int vallen)
5549 {
5550         struct getinfo_fid2path *fpout, *fpin;
5551         int rc = 0;
5552
5553         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5554         fpout = val;
5555
5556         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5557                 lustre_swab_fid2path(fpin);
5558
5559         memcpy(fpout, fpin, sizeof(*fpin));
5560         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5561                 RETURN(-EINVAL);
5562
5563         rc = mdt_fid2path(info, fpout);
5564         RETURN(rc);
5565 }
5566
5567 int mdt_get_info(struct tgt_session_info *tsi)
5568 {
5569         char    *key;
5570         int      keylen;
5571         __u32   *vallen;
5572         void    *valout;
5573         int      rc;
5574
5575         ENTRY;
5576
5577         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5578         if (key == NULL) {
5579                 CDEBUG(D_IOCTL, "No GETINFO key");
5580                 RETURN(err_serious(-EFAULT));
5581         }
5582         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5583                                       RCL_CLIENT);
5584
5585         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5586         if (vallen == NULL) {
5587                 CDEBUG(D_IOCTL, "Unable to get RMF_GETINFO_VALLEN buffer");
5588                 RETURN(err_serious(-EFAULT));
5589         }
5590
5591         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5592                              *vallen);
5593         rc = req_capsule_server_pack(tsi->tsi_pill);
5594         if (rc)
5595                 RETURN(err_serious(rc));
5596
5597         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5598         if (valout == NULL) {
5599                 CDEBUG(D_IOCTL, "Unable to get get-info RPC out buffer");
5600                 RETURN(err_serious(-EFAULT));
5601         }
5602
5603         if (KEY_IS(KEY_FID2PATH)) {
5604                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5605
5606                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5607                 mdt_thread_info_fini(info);
5608         } else {
5609                 rc = -EINVAL;
5610         }
5611         RETURN(rc);
5612 }
5613
5614 /* Pass the ioc down */
5615 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5616                          unsigned int cmd, int len, void *data)
5617 {
5618         struct lu_context ioctl_session;
5619         struct md_device *next = mdt->mdt_child;
5620         int rc;
5621         ENTRY;
5622
5623         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5624         if (rc)
5625                 RETURN(rc);
5626         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5627         lu_context_enter(&ioctl_session);
5628         env->le_ses = &ioctl_session;
5629
5630         LASSERT(next->md_ops->mdo_iocontrol);
5631         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5632
5633         lu_context_exit(&ioctl_session);
5634         lu_context_fini(&ioctl_session);
5635         RETURN(rc);
5636 }
5637
5638 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5639 {
5640         struct obd_ioctl_data *data = karg;
5641         struct lu_fid *fid;
5642         __u64 version;
5643         struct mdt_object *obj;
5644         struct mdt_lock_handle  *lh;
5645         int rc;
5646         ENTRY;
5647
5648         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5649             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5650                 RETURN(-EINVAL);
5651
5652         fid = (struct lu_fid *)data->ioc_inlbuf1;
5653
5654         if (!fid_is_sane(fid))
5655                 RETURN(-EINVAL);
5656
5657         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5658
5659         lh = &mti->mti_lh[MDT_LH_PARENT];
5660         mdt_lock_reg_init(lh, LCK_CR);
5661
5662         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5663         if (IS_ERR(obj))
5664                 RETURN(PTR_ERR(obj));
5665
5666         if (mdt_object_remote(obj)) {
5667                 rc = -EREMOTE;
5668                 /**
5669                  * before calling version get the correct MDS should be
5670                  * fid, this is error to find remote object here
5671                  */
5672                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5673         } else if (!mdt_object_exists(obj)) {
5674                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5675                 rc = -ENOENT;
5676         } else {
5677                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5678                *(__u64 *)data->ioc_inlbuf2 = version;
5679                 rc = 0;
5680         }
5681         mdt_object_unlock_put(mti, obj, lh, 1);
5682         RETURN(rc);
5683 }
5684
5685 /* ioctls on obd dev */
5686 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5687                          void *karg, void *uarg)
5688 {
5689         struct lu_env      env;
5690         struct obd_device *obd = exp->exp_obd;
5691         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5692         struct dt_device  *dt = mdt->mdt_bottom;
5693         int rc;
5694
5695         ENTRY;
5696         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5697         rc = lu_env_init(&env, LCT_MD_THREAD);
5698         if (rc)
5699                 RETURN(rc);
5700
5701         switch (cmd) {
5702         case OBD_IOC_SYNC:
5703                 rc = mdt_device_sync(&env, mdt);
5704                 break;
5705         case OBD_IOC_SET_READONLY:
5706                 rc = dt->dd_ops->dt_ro(&env, dt);
5707                 break;
5708         case OBD_IOC_ABORT_RECOVERY:
5709                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5710                 target_stop_recovery_thread(obd);
5711                 rc = 0;
5712                 break;
5713         case OBD_IOC_CHANGELOG_REG:
5714         case OBD_IOC_CHANGELOG_DEREG:
5715         case OBD_IOC_CHANGELOG_CLEAR:
5716                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5717                 break;
5718         case OBD_IOC_START_LFSCK: {
5719                 struct md_device *next = mdt->mdt_child;
5720                 struct obd_ioctl_data *data = karg;
5721                 struct lfsck_start_param lsp;
5722
5723                 if (unlikely(data == NULL)) {
5724                         rc = -EINVAL;
5725                         break;
5726                 }
5727
5728                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5729                 lsp.lsp_index_valid = 0;
5730                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5731                 break;
5732         }
5733         case OBD_IOC_STOP_LFSCK: {
5734                 struct md_device        *next = mdt->mdt_child;
5735                 struct obd_ioctl_data   *data = karg;
5736                 struct lfsck_stop        stop;
5737
5738                 stop.ls_status = LS_STOPPED;
5739                 /* Old lfsck utils may pass NULL @stop. */
5740                 if (data->ioc_inlbuf1 == NULL)
5741                         stop.ls_flags = 0;
5742                 else
5743                         stop.ls_flags =
5744                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5745
5746                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5747                 break;
5748         }
5749         case OBD_IOC_GET_OBJ_VERSION: {
5750                 struct mdt_thread_info *mti;
5751                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5752                 memset(mti, 0, sizeof *mti);
5753                 mti->mti_env = &env;
5754                 mti->mti_mdt = mdt;
5755                 mti->mti_exp = exp;
5756
5757                 rc = mdt_ioc_version_get(mti, karg);
5758                 break;
5759         }
5760         case OBD_IOC_CATLOGLIST: {
5761                 struct mdt_thread_info *mti;
5762
5763                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5764                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5765                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5766                                        &mti->mti_tmp_fid1);
5767                 break;
5768          }
5769         default:
5770                 rc = -EOPNOTSUPP;
5771                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5772                         mdt_obd_name(mdt), cmd, rc);
5773         }
5774
5775         lu_env_fini(&env);
5776         RETURN(rc);
5777 }
5778
5779 int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5780 {
5781         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5782         int rc;
5783         ENTRY;
5784
5785         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5786         RETURN(rc);
5787 }
5788
5789 int mdt_obd_postrecov(struct obd_device *obd)
5790 {
5791         struct lu_env env;
5792         int rc;
5793
5794         rc = lu_env_init(&env, LCT_MD_THREAD);
5795         if (rc)
5796                 RETURN(rc);
5797         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5798         lu_env_fini(&env);
5799         return rc;
5800 }
5801
5802 static struct obd_ops mdt_obd_device_ops = {
5803         .o_owner          = THIS_MODULE,
5804         .o_set_info_async = mdt_obd_set_info_async,
5805         .o_connect        = mdt_obd_connect,
5806         .o_reconnect      = mdt_obd_reconnect,
5807         .o_disconnect     = mdt_obd_disconnect,
5808         .o_init_export    = mdt_init_export,
5809         .o_destroy_export = mdt_destroy_export,
5810         .o_iocontrol      = mdt_iocontrol,
5811         .o_postrecov      = mdt_obd_postrecov,
5812 };
5813
5814 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5815                                          struct lu_device *d)
5816 {
5817         struct mdt_device *m = mdt_dev(d);
5818         ENTRY;
5819
5820         mdt_fini(env, m);
5821         RETURN(NULL);
5822 }
5823
5824 static struct lu_device *mdt_device_free(const struct lu_env *env,
5825                                          struct lu_device *d)
5826 {
5827         struct mdt_device *m = mdt_dev(d);
5828         ENTRY;
5829
5830         lu_device_fini(&m->mdt_lu_dev);
5831         OBD_FREE_PTR(m);
5832
5833         RETURN(NULL);
5834 }
5835
5836 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5837                                           struct lu_device_type *t,
5838                                           struct lustre_cfg *cfg)
5839 {
5840         struct lu_device  *l;
5841         struct mdt_device *m;
5842
5843         OBD_ALLOC_PTR(m);
5844         if (m != NULL) {
5845                 int rc;
5846
5847                 l = &m->mdt_lu_dev;
5848                 rc = mdt_init0(env, m, t, cfg);
5849                 if (rc != 0) {
5850                         mdt_device_free(env, l);
5851                         l = ERR_PTR(rc);
5852                         return l;
5853                 }
5854         } else
5855                 l = ERR_PTR(-ENOMEM);
5856         return l;
5857 }
5858
5859 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5860 LU_KEY_INIT(mdt, struct mdt_thread_info);
5861
5862 static void mdt_key_fini(const struct lu_context *ctx,
5863                          struct lu_context_key *key, void* data)
5864 {
5865         struct mdt_thread_info *info = data;
5866
5867         if (info->mti_big_lmm) {
5868                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5869                 info->mti_big_lmm = NULL;
5870                 info->mti_big_lmmsize = 0;
5871         }
5872         OBD_FREE_PTR(info);
5873 }
5874
5875 /* context key: mdt_thread_key */
5876 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5877
5878 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5879 {
5880         return lu_ucred(info->mti_env);
5881 }
5882
5883 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5884 {
5885         return lu_ucred_check(info->mti_env);
5886 }
5887
5888 /**
5889  * Enable/disable COS (Commit On Sharing).
5890  *
5891  * Set/Clear the COS flag in mdt options.
5892  *
5893  * \param mdt mdt device
5894  * \param val 0 disables COS, other values enable COS
5895  */
5896 void mdt_enable_cos(struct mdt_device *mdt, int val)
5897 {
5898         struct lu_env env;
5899         int rc;
5900
5901         mdt->mdt_opts.mo_cos = !!val;
5902         rc = lu_env_init(&env, LCT_LOCAL);
5903         if (unlikely(rc != 0)) {
5904                 CWARN("lu_env initialization failed with rc = %d,"
5905                       "cannot sync\n", rc);
5906                 return;
5907         }
5908         mdt_device_sync(&env, mdt);
5909         lu_env_fini(&env);
5910 }
5911
5912 /**
5913  * Check COS (Commit On Sharing) status.
5914  *
5915  * Return COS flag status.
5916  *
5917  * \param mdt mdt device
5918  */
5919 int mdt_cos_is_enabled(struct mdt_device *mdt)
5920 {
5921         return mdt->mdt_opts.mo_cos != 0;
5922 }
5923
5924 static struct lu_device_type_operations mdt_device_type_ops = {
5925         .ldto_device_alloc = mdt_device_alloc,
5926         .ldto_device_free  = mdt_device_free,
5927         .ldto_device_fini  = mdt_device_fini
5928 };
5929
5930 static struct lu_device_type mdt_device_type = {
5931         .ldt_tags     = LU_DEVICE_MD,
5932         .ldt_name     = LUSTRE_MDT_NAME,
5933         .ldt_ops      = &mdt_device_type_ops,
5934         .ldt_ctx_tags = LCT_MD_THREAD
5935 };
5936
5937 static int __init mdt_mod_init(void)
5938 {
5939         struct lprocfs_static_vars lvars;
5940         int rc;
5941
5942         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5943                  FID_NOBRACE_LEN + 1);
5944         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5945                  FID_LEN + 1);
5946         rc = lu_kmem_init(mdt_caches);
5947         if (rc)
5948                 return rc;
5949
5950         rc = mds_mod_init();
5951         if (rc)
5952                 GOTO(lu_fini, rc);
5953
5954         lprocfs_mdt_init_vars(&lvars);
5955         rc = class_register_type(&mdt_obd_device_ops, NULL, NULL,
5956 #ifndef HAVE_ONLY_PROCFS_SEQ
5957                                 lvars.module_vars,
5958 #endif
5959                                 LUSTRE_MDT_NAME, &mdt_device_type);
5960         if (rc)
5961                 GOTO(mds_fini, rc);
5962 lu_fini:
5963         if (rc)
5964                 lu_kmem_fini(mdt_caches);
5965 mds_fini:
5966         if (rc)
5967                 mds_mod_exit();
5968         return rc;
5969 }
5970
5971 static void __exit mdt_mod_exit(void)
5972 {
5973         class_unregister_type(LUSTRE_MDT_NAME);
5974         mds_mod_exit();
5975         lu_kmem_fini(mdt_caches);
5976 }
5977
5978 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5979 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5980 MODULE_LICENSE("GPL");
5981
5982 cfs_module(mdt, LUSTRE_VERSION_STRING, mdt_mod_init, mdt_mod_exit);