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, 2014, 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 #include <lustre_ioctl.h>
  57 /* struct ptlrpc_request */
  58 #include <lustre_net.h>
  59 /* struct obd_export */
  60 #include <lustre_export.h>
  61 /* struct obd_device */
  62 #include <obd.h>
  63 /* lu2dt_dev() */
  64 #include <dt_object.h>
  65 #include <lustre_mds.h>
  66 #include <lustre_log.h>
  67 #include "mdt_internal.h"
  68 #include <lustre_acl.h>
  69 #include <lustre_param.h>
  70 #include <lustre_quota.h>
  71 #include <lustre_lfsck.h>
  72 #include <lustre_nodemap.h>
  73
  74 static unsigned int max_mod_rpcs_per_client = 8;
  75 CFS_MODULE_PARM(max_mod_rpcs_per_client, "i", uint, 0644,
  76                 "maximum number of modify RPCs in flight allowed per client");
  77
  78 mdl_mode_t mdt_mdl_lock_modes[] = {
  79         [LCK_MINMODE] = MDL_MINMODE,
  80         [LCK_EX]      = MDL_EX,
  81         [LCK_PW]      = MDL_PW,
  82         [LCK_PR]      = MDL_PR,
  83         [LCK_CW]      = MDL_CW,
  84         [LCK_CR]      = MDL_CR,
  85         [LCK_NL]      = MDL_NL,
  86         [LCK_GROUP]   = MDL_GROUP
  87 };
  88
  89 ldlm_mode_t mdt_dlm_lock_modes[] = {
  90         [MDL_MINMODE] = LCK_MINMODE,
  91         [MDL_EX]      = LCK_EX,
  92         [MDL_PW]      = LCK_PW,
  93         [MDL_PR]      = LCK_PR,
  94         [MDL_CW]      = LCK_CW,
  95         [MDL_CR]      = LCK_CR,
  96         [MDL_NL]      = LCK_NL,
  97         [MDL_GROUP]   = LCK_GROUP
  98 };
  99
 100 static struct mdt_device *mdt_dev(struct lu_device *d);
 101 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
 102
 103 static const struct lu_object_operations mdt_obj_ops;
 104
 105 /* Slab for MDT object allocation */
 106 static struct kmem_cache *mdt_object_kmem;
 107
 108 /* For HSM restore handles */
 109 struct kmem_cache *mdt_hsm_cdt_kmem;
 110
 111 /* For HSM request handles */
 112 struct kmem_cache *mdt_hsm_car_kmem;
 113
 114 static struct lu_kmem_descr mdt_caches[] = {
 115         {
 116                 .ckd_cache = &mdt_object_kmem,
 117                 .ckd_name  = "mdt_obj",
 118                 .ckd_size  = sizeof(struct mdt_object)
 119         },
 120         {
 121                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 122                 .ckd_name       = "mdt_cdt_restore_handle",
 123                 .ckd_size       = sizeof(struct cdt_restore_handle)
 124         },
 125         {
 126                 .ckd_cache      = &mdt_hsm_car_kmem,
 127                 .ckd_name       = "mdt_cdt_agent_req",
 128                 .ckd_size       = sizeof(struct cdt_agent_req)
 129         },
 130         {
 131                 .ckd_cache = NULL
 132         }
 133 };
 134
 135 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 136 {
 137         if (!rep)
 138                 return 0;
 139         return rep->lock_policy_res1 & op_flag;
 140 }
 141
 142 void mdt_clear_disposition(struct mdt_thread_info *info,
 143                            struct ldlm_reply *rep, __u64 op_flag)
 144 {
 145         if (info) {
 146                 info->mti_opdata &= ~op_flag;
 147                 tgt_opdata_clear(info->mti_env, op_flag);
 148         }
 149         if (rep)
 150                 rep->lock_policy_res1 &= ~op_flag;
 151 }
 152
 153 void mdt_set_disposition(struct mdt_thread_info *info,
 154                          struct ldlm_reply *rep, __u64 op_flag)
 155 {
 156         if (info) {
 157                 info->mti_opdata |= op_flag;
 158                 tgt_opdata_set(info->mti_env, op_flag);
 159         }
 160         if (rep)
 161                 rep->lock_policy_res1 |= op_flag;
 162 }
 163
 164 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
 165 {
 166         lh->mlh_pdo_hash = 0;
 167         lh->mlh_reg_mode = lm;
 168         lh->mlh_rreg_mode = lm;
 169         lh->mlh_type = MDT_REG_LOCK;
 170 }
 171
 172 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
 173                        const struct lu_name *lname)
 174 {
 175         lh->mlh_reg_mode = lock_mode;
 176         lh->mlh_rreg_mode = lock_mode;
 177         lh->mlh_type = MDT_PDO_LOCK;
 178
 179         if (lu_name_is_valid(lname)) {
 180                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
 181                                                   lname->ln_namelen);
 182                 /* XXX Workaround for LU-2856
 183                  *
 184                  * Zero is a valid return value of full_name_hash, but
 185                  * several users of mlh_pdo_hash assume a non-zero
 186                  * hash value. We therefore map zero onto an
 187                  * arbitrary, but consistent value (1) to avoid
 188                  * problems further down the road. */
 189                 if (unlikely(lh->mlh_pdo_hash == 0))
 190                         lh->mlh_pdo_hash = 1;
 191         } else {
 192                 lh->mlh_pdo_hash = 0;
 193         }
 194 }
 195
 196 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 197                               struct mdt_lock_handle *lh)
 198 {
 199         mdl_mode_t mode;
 200         ENTRY;
 201
 202         /*
 203          * Any dir access needs couple of locks:
 204          *
 205          * 1) on part of dir we gonna take lookup/modify;
 206          *
 207          * 2) on whole dir to protect it from concurrent splitting and/or to
 208          * flush client's cache for readdir().
 209          *
 210          * so, for a given mode and object this routine decides what lock mode
 211          * to use for lock #2:
 212          *
 213          * 1) if caller's gonna lookup in dir then we need to protect dir from
 214          * being splitted only - LCK_CR
 215          *
 216          * 2) if caller's gonna modify dir then we need to protect dir from
 217          * being splitted and to flush cache - LCK_CW
 218          *
 219          * 3) if caller's gonna modify dir and that dir seems ready for
 220          * splitting then we need to protect it from any type of access
 221          * (lookup/modify/split) - LCK_EX --bzzz
 222          */
 223
 224         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 225         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 226
 227         /*
 228          * Ask underlaying level its opinion about preferable PDO lock mode
 229          * having access type passed as regular lock mode:
 230          *
 231          * - MDL_MINMODE means that lower layer does not want to specify lock
 232          * mode;
 233          *
 234          * - MDL_NL means that no PDO lock should be taken. This is used in some
 235          * cases. Say, for non-splittable directories no need to use PDO locks
 236          * at all.
 237          */
 238         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 239                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 240
 241         if (mode != MDL_MINMODE) {
 242                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 243         } else {
 244                 /*
 245                  * Lower layer does not want to specify locking mode. We do it
 246                  * our selves. No special protection is needed, just flush
 247                  * client's cache on modification and allow concurrent
 248                  * mondification.
 249                  */
 250                 switch (lh->mlh_reg_mode) {
 251                 case LCK_EX:
 252                         lh->mlh_pdo_mode = LCK_EX;
 253                         break;
 254                 case LCK_PR:
 255                         lh->mlh_pdo_mode = LCK_CR;
 256                         break;
 257                 case LCK_PW:
 258                         lh->mlh_pdo_mode = LCK_CW;
 259                         break;
 260                 default:
 261                         CERROR("Not expected lock type (0x%x)\n",
 262                                (int)lh->mlh_reg_mode);
 263                         LBUG();
 264                 }
 265         }
 266
 267         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 268         EXIT;
 269 }
 270
 271 static int mdt_getstatus(struct tgt_session_info *tsi)
 272 {
 273         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 274         struct mdt_device       *mdt = info->mti_mdt;
 275         struct mdt_body         *repbody;
 276         int                      rc;
 277
 278         ENTRY;
 279
 280         rc = mdt_check_ucred(info);
 281         if (rc)
 282                 GOTO(out, rc = err_serious(rc));
 283
 284         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
 285                 GOTO(out, rc = err_serious(-ENOMEM));
 286
 287         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 288         repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 289         repbody->mbo_valid |= OBD_MD_FLID;
 290
 291         EXIT;
 292 out:
 293         mdt_thread_info_fini(info);
 294         return rc;
 295 }
 296
 297 static int mdt_statfs(struct tgt_session_info *tsi)
 298 {
 299         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 300         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 301         struct md_device                *next = info->mti_mdt->mdt_child;
 302         struct ptlrpc_service_part      *svcpt;
 303         struct obd_statfs               *osfs;
 304         int                             rc;
 305
 306         ENTRY;
 307
 308         svcpt = req->rq_rqbd->rqbd_svcpt;
 309
 310         /* This will trigger a watchdog timeout */
 311         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 312                          (MDT_SERVICE_WATCHDOG_FACTOR *
 313                           at_get(&svcpt->scp_at_estimate)) + 1);
 314
 315         rc = mdt_check_ucred(info);
 316         if (rc)
 317                 GOTO(out, rc = err_serious(rc));
 318
 319         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 320                 GOTO(out, rc = err_serious(-ENOMEM));
 321
 322         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 323         if (!osfs)
 324                 GOTO(out, rc = -EPROTO);
 325
 326         /** statfs information are cached in the mdt_device */
 327         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 328                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 329                 /** statfs data is too old, get up-to-date one */
 330                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 331                 if (rc)
 332                         GOTO(out, rc);
 333                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 334                 info->mti_mdt->mdt_osfs = *osfs;
 335                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 336                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 337         } else {
 338                 /** use cached statfs data */
 339                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 340                 *osfs = info->mti_mdt->mdt_osfs;
 341                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 342         }
 343
 344         if (rc == 0)
 345                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 346 out:
 347         mdt_thread_info_fini(info);
 348         RETURN(rc);
 349 }
 350
 351 #ifdef CONFIG_FS_POSIX_ACL
 352 /*
 353  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 354  *
 355  * \param       info    thread info object
 356  * \param       repbody reply to pack ACLs into
 357  * \param       o       mdt object of file to examine
 358  * \param       nodemap nodemap of client to reply to
 359  * \retval      0       success
 360  * \retval      -errno  error getting or parsing ACL from disk
 361  */
 362 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 363                       struct mdt_object *o, struct lu_nodemap *nodemap)
 364 {
 365         const struct lu_env     *env = info->mti_env;
 366         struct md_object        *next = mdt_object_child(o);
 367         struct lu_buf           *buf = &info->mti_buf;
 368         int rc;
 369
 370         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 371         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 372                                            RCL_SERVER);
 373         if (buf->lb_len == 0)
 374                 return 0;
 375
 376         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 377         if (rc < 0) {
 378                 if (rc == -ENODATA) {
 379                         repbody->mbo_aclsize = 0;
 380                         repbody->mbo_valid |= OBD_MD_FLACL;
 381                         rc = 0;
 382                 } else if (rc == -EOPNOTSUPP) {
 383                         rc = 0;
 384                 } else {
 385                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 386                                mdt_obd_name(info->mti_mdt),
 387                                PFID(mdt_object_fid(o)), rc);
 388                 }
 389         } else {
 390                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 391                                      rc, NODEMAP_FS_TO_CLIENT);
 392                 /* if all ACLs mapped out, rc is still >= 0 */
 393                 if (rc < 0) {
 394                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 395                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
 396                                PFID(mdt_object_fid(o)), rc);
 397                 } else {
 398                         repbody->mbo_aclsize = rc;
 399                         repbody->mbo_valid |= OBD_MD_FLACL;
 400                         rc = 0;
 401                 }
 402         }
 403         return rc;
 404 }
 405 #endif
 406
 407 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 408                         const struct lu_attr *attr, const struct lu_fid *fid)
 409 {
 410         struct md_attr          *ma = &info->mti_attr;
 411         struct obd_export       *exp = info->mti_exp;
 412         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 413
 414         LASSERT(ma->ma_valid & MA_INODE);
 415
 416         if (attr->la_valid & LA_ATIME) {
 417                 b->mbo_atime = attr->la_atime;
 418                 b->mbo_valid |= OBD_MD_FLATIME;
 419         }
 420         if (attr->la_valid & LA_MTIME) {
 421                 b->mbo_mtime = attr->la_mtime;
 422                 b->mbo_valid |= OBD_MD_FLMTIME;
 423         }
 424         if (attr->la_valid & LA_CTIME) {
 425                 b->mbo_ctime = attr->la_ctime;
 426                 b->mbo_valid |= OBD_MD_FLCTIME;
 427         }
 428         if (attr->la_valid & LA_FLAGS) {
 429                 b->mbo_flags = attr->la_flags;
 430                 b->mbo_valid |= OBD_MD_FLFLAGS;
 431         }
 432         if (attr->la_valid & LA_NLINK) {
 433                 b->mbo_nlink = attr->la_nlink;
 434                 b->mbo_valid |= OBD_MD_FLNLINK;
 435         }
 436         if (attr->la_valid & LA_UID) {
 437                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 438                                             NODEMAP_FS_TO_CLIENT,
 439                                             attr->la_uid);
 440                 b->mbo_valid |= OBD_MD_FLUID;
 441         }
 442         if (attr->la_valid & LA_GID) {
 443                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 444                                             NODEMAP_FS_TO_CLIENT,
 445                                             attr->la_gid);
 446                 b->mbo_valid |= OBD_MD_FLGID;
 447         }
 448         b->mbo_mode = attr->la_mode;
 449         if (attr->la_valid & LA_MODE)
 450                 b->mbo_valid |= OBD_MD_FLMODE;
 451         if (attr->la_valid & LA_TYPE)
 452                 b->mbo_valid |= OBD_MD_FLTYPE;
 453
 454         if (fid != NULL) {
 455                 b->mbo_fid1 = *fid;
 456                 b->mbo_valid |= OBD_MD_FLID;
 457                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid="LPX64"\n",
 458                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 459         }
 460
 461         if (info != NULL)
 462                 mdt_body_reverse_idmap(info, b);
 463
 464         if (!(attr->la_valid & LA_TYPE))
 465                 return;
 466
 467         b->mbo_rdev   = attr->la_rdev;
 468         b->mbo_size   = attr->la_size;
 469         b->mbo_blocks = attr->la_blocks;
 470
 471         if (!S_ISREG(attr->la_mode)) {
 472                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 473         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 474                 /* means no objects are allocated on osts. */
 475                 LASSERT(!(ma->ma_valid & MA_LOV));
 476                 /* just ignore blocks occupied by extend attributes on MDS */
 477                 b->mbo_blocks = 0;
 478                 /* if no object is allocated on osts, the size on mds is valid.
 479                  * b=22272 */
 480                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 481         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 482                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 483                 /* A released file stores its size on MDS. */
 484                 /* But return 1 block for released file, unless tools like tar
 485                  * will consider it fully sparse. (LU-3864)
 486                  */
 487                 if (unlikely(b->mbo_size == 0))
 488                         b->mbo_blocks = 0;
 489                 else
 490                         b->mbo_blocks = 1;
 491                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 492         }
 493
 494         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 495                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 496                        PFID(fid), (unsigned long long)b->mbo_size);
 497 }
 498
 499 static inline int mdt_body_has_lov(const struct lu_attr *la,
 500                                    const struct mdt_body *body)
 501 {
 502         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 503                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 504 }
 505
 506 void mdt_client_compatibility(struct mdt_thread_info *info)
 507 {
 508         struct mdt_body       *body;
 509         struct ptlrpc_request *req = mdt_info_req(info);
 510         struct obd_export     *exp = req->rq_export;
 511         struct md_attr        *ma = &info->mti_attr;
 512         struct lu_attr        *la = &ma->ma_attr;
 513         ENTRY;
 514
 515         if (exp_connect_layout(exp))
 516                 /* the client can deal with 16-bit lmm_stripe_count */
 517                 RETURN_EXIT;
 518
 519         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 520
 521         if (!mdt_body_has_lov(la, body))
 522                 RETURN_EXIT;
 523
 524         /* now we have a reply with a lov for a client not compatible with the
 525          * layout lock so we have to clean the layout generation number */
 526         if (S_ISREG(la->la_mode))
 527                 ma->ma_lmm->lmm_layout_gen = 0;
 528         EXIT;
 529 }
 530
 531 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 532                                    struct mdt_object *o)
 533 {
 534         const struct lu_env *env = info->mti_env;
 535         int rc, rc2;
 536
 537         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 538                           XATTR_NAME_LOV);
 539
 540         if (rc == -ENODATA)
 541                 rc = 0;
 542
 543         if (rc < 0)
 544                 goto out;
 545
 546         /* Is it a directory? Let's check for the LMV as well */
 547         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 548                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 549                                    XATTR_NAME_LMV);
 550
 551                 if (rc2 == -ENODATA)
 552                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 553                                            &LU_BUF_NULL,
 554                                            XATTR_NAME_DEFAULT_LMV);
 555
 556                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 557                         rc = rc2;
 558         }
 559
 560 out:
 561         return rc;
 562 }
 563
 564 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 565                       const char *name)
 566 {
 567         const struct lu_env *env = info->mti_env;
 568         int rc;
 569         ENTRY;
 570
 571         LASSERT(info->mti_big_lmm_used == 0);
 572         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 573         if (rc < 0)
 574                 RETURN(rc);
 575
 576         /* big_lmm may need to be grown */
 577         if (info->mti_big_lmmsize < rc) {
 578                 int size = size_roundup_power2(rc);
 579
 580                 if (info->mti_big_lmmsize > 0) {
 581                         /* free old buffer */
 582                         LASSERT(info->mti_big_lmm);
 583                         OBD_FREE_LARGE(info->mti_big_lmm,
 584                                        info->mti_big_lmmsize);
 585                         info->mti_big_lmm = NULL;
 586                         info->mti_big_lmmsize = 0;
 587                 }
 588
 589                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 590                 if (info->mti_big_lmm == NULL)
 591                         RETURN(-ENOMEM);
 592                 info->mti_big_lmmsize = size;
 593         }
 594         LASSERT(info->mti_big_lmmsize >= rc);
 595
 596         info->mti_buf.lb_buf = info->mti_big_lmm;
 597         info->mti_buf.lb_len = info->mti_big_lmmsize;
 598         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 599
 600         RETURN(rc);
 601 }
 602
 603 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 604                    struct md_attr *ma, const char *name)
 605 {
 606         struct md_object *next = mdt_object_child(o);
 607         struct lu_buf    *buf = &info->mti_buf;
 608         int rc;
 609
 610         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 611                 buf->lb_buf = ma->ma_lmm;
 612                 buf->lb_len = ma->ma_lmm_size;
 613                 LASSERT(!(ma->ma_valid & MA_LOV));
 614         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 615                 buf->lb_buf = ma->ma_lmv;
 616                 buf->lb_len = ma->ma_lmv_size;
 617                 LASSERT(!(ma->ma_valid & MA_LMV));
 618         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 619                 buf->lb_buf = ma->ma_lmv;
 620                 buf->lb_len = ma->ma_lmv_size;
 621                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 622         } else {
 623                 return -EINVAL;
 624         }
 625
 626         rc = mo_xattr_get(info->mti_env, next, buf, name);
 627         if (rc > 0) {
 628
 629 got:
 630                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 631                         if (info->mti_big_lmm_used)
 632                                 ma->ma_lmm = info->mti_big_lmm;
 633
 634                         /* NOT return LOV EA with hole to old client. */
 635                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 636                                      LOV_PATTERN_F_HOLE) &&
 637                             !(exp_connect_flags(info->mti_exp) &
 638                               OBD_CONNECT_LFSCK)) {
 639                                 return -EIO;
 640                         } else {
 641                                 ma->ma_lmm_size = rc;
 642                                 ma->ma_valid |= MA_LOV;
 643                         }
 644                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 645                         if (info->mti_big_lmm_used)
 646                                 ma->ma_lmv = info->mti_big_lmm;
 647
 648                         ma->ma_lmv_size = rc;
 649                         ma->ma_valid |= MA_LMV;
 650                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 651                         ma->ma_lmv_size = rc;
 652                         ma->ma_valid |= MA_LMV_DEF;
 653                 }
 654
 655                 /* Update mdt_max_mdsize so all clients will be aware that */
 656                 if (info->mti_mdt->mdt_max_mdsize < rc)
 657                         info->mti_mdt->mdt_max_mdsize = rc;
 658
 659                 rc = 0;
 660         } else if (rc == -ENODATA) {
 661                 /* no LOV EA */
 662                 rc = 0;
 663         } else if (rc == -ERANGE) {
 664                 /* Default LMV has fixed size, so it must be able to fit
 665                  * in the original buffer */
 666                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 667                         return rc;
 668                 rc = mdt_big_xattr_get(info, o, name);
 669                 if (rc > 0) {
 670                         info->mti_big_lmm_used = 1;
 671                         goto got;
 672                 }
 673         }
 674
 675         return rc;
 676 }
 677
 678 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 679                              struct mdt_object *o, struct lu_fid *pfid)
 680 {
 681         struct lu_buf           *buf = &info->mti_buf;
 682         struct link_ea_header   *leh;
 683         struct link_ea_entry    *lee;
 684         int                      rc;
 685         ENTRY;
 686
 687         buf->lb_buf = info->mti_big_lmm;
 688         buf->lb_len = info->mti_big_lmmsize;
 689         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 690                           buf, XATTR_NAME_LINK);
 691         /* ignore errors, MA_PFID won't be set and it is
 692          * up to the caller to treat this as an error */
 693         if (rc == -ERANGE || buf->lb_len == 0) {
 694                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 695                 buf->lb_buf = info->mti_big_lmm;
 696                 buf->lb_len = info->mti_big_lmmsize;
 697         }
 698
 699         if (rc < 0)
 700                 RETURN(rc);
 701         if (rc < sizeof(*leh)) {
 702                 CERROR("short LinkEA on "DFID": rc = %d\n",
 703                        PFID(mdt_object_fid(o)), rc);
 704                 RETURN(-ENODATA);
 705         }
 706
 707         leh = (struct link_ea_header *) buf->lb_buf;
 708         lee = (struct link_ea_entry *)(leh + 1);
 709         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 710                 leh->leh_magic = LINK_EA_MAGIC;
 711                 leh->leh_reccount = __swab32(leh->leh_reccount);
 712                 leh->leh_len = __swab64(leh->leh_len);
 713         }
 714         if (leh->leh_magic != LINK_EA_MAGIC)
 715                 RETURN(-EINVAL);
 716         if (leh->leh_reccount == 0)
 717                 RETURN(-ENODATA);
 718
 719         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 720         fid_be_to_cpu(pfid, pfid);
 721
 722         RETURN(0);
 723 }
 724
 725 int mdt_attr_get_complex(struct mdt_thread_info *info,
 726                          struct mdt_object *o, struct md_attr *ma)
 727 {
 728         const struct lu_env *env = info->mti_env;
 729         struct md_object    *next = mdt_object_child(o);
 730         struct lu_buf       *buf = &info->mti_buf;
 731         int                  need = ma->ma_need;
 732         int                  rc = 0, rc2;
 733         u32                  mode;
 734         ENTRY;
 735
 736         ma->ma_valid = 0;
 737
 738         if (mdt_object_exists(o) == 0)
 739                 GOTO(out, rc = -ENOENT);
 740         mode = lu_object_attr(&next->mo_lu);
 741
 742         if (need & MA_INODE) {
 743                 ma->ma_need = MA_INODE;
 744                 rc = mo_attr_get(env, next, ma);
 745                 if (rc)
 746                         GOTO(out, rc);
 747                 ma->ma_valid |= MA_INODE;
 748         }
 749
 750         if (need & MA_PFID) {
 751                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 752                 if (rc == 0)
 753                         ma->ma_valid |= MA_PFID;
 754                 /* ignore this error, parent fid is not mandatory */
 755                 rc = 0;
 756         }
 757
 758         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 759                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 760                 if (rc)
 761                         GOTO(out, rc);
 762         }
 763
 764         if (need & MA_LMV && S_ISDIR(mode)) {
 765                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 766                 if (rc != 0)
 767                         GOTO(out, rc);
 768         }
 769
 770         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 771                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 772                 if (rc != 0)
 773                         GOTO(out, rc);
 774         }
 775
 776         if (need & MA_HSM && S_ISREG(mode)) {
 777                 buf->lb_buf = info->mti_xattr_buf;
 778                 buf->lb_len = sizeof(info->mti_xattr_buf);
 779                 CLASSERT(sizeof(struct hsm_attrs) <=
 780                          sizeof(info->mti_xattr_buf));
 781                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 782                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 783                 if (rc2 == 0)
 784                         ma->ma_valid |= MA_HSM;
 785                 else if (rc2 < 0 && rc2 != -ENODATA)
 786                         GOTO(out, rc = rc2);
 787         }
 788
 789 #ifdef CONFIG_FS_POSIX_ACL
 790         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 791                 buf->lb_buf = ma->ma_acl;
 792                 buf->lb_len = ma->ma_acl_size;
 793                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 794                 if (rc2 > 0) {
 795                         ma->ma_acl_size = rc2;
 796                         ma->ma_valid |= MA_ACL_DEF;
 797                 } else if (rc2 == -ENODATA) {
 798                         /* no ACLs */
 799                         ma->ma_acl_size = 0;
 800                 } else
 801                         GOTO(out, rc = rc2);
 802         }
 803 #endif
 804 out:
 805         ma->ma_need = need;
 806         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 807                rc, ma->ma_valid, ma->ma_lmm);
 808         RETURN(rc);
 809 }
 810
 811 static int mdt_getattr_internal(struct mdt_thread_info *info,
 812                                 struct mdt_object *o, int ma_need)
 813 {
 814         struct md_object        *next = mdt_object_child(o);
 815         const struct mdt_body   *reqbody = info->mti_body;
 816         struct ptlrpc_request   *req = mdt_info_req(info);
 817         struct md_attr          *ma = &info->mti_attr;
 818         struct lu_attr          *la = &ma->ma_attr;
 819         struct req_capsule      *pill = info->mti_pill;
 820         const struct lu_env     *env = info->mti_env;
 821         struct mdt_body         *repbody;
 822         struct lu_buf           *buffer = &info->mti_buf;
 823         struct obd_export       *exp = info->mti_exp;
 824         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 825         int                      rc;
 826         int                      is_root;
 827         ENTRY;
 828
 829         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 830                 RETURN(err_serious(-ENOMEM));
 831
 832         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 833
 834         ma->ma_valid = 0;
 835
 836         if (mdt_object_remote(o)) {
 837                 /* This object is located on remote node.*/
 838                 /* Return -ENOTSUPP for old client */
 839                 if (!mdt_is_dne_client(req->rq_export))
 840                         GOTO(out, rc = -ENOTSUPP);
 841
 842                 repbody->mbo_fid1 = *mdt_object_fid(o);
 843                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
 844                 GOTO(out, rc = 0);
 845         }
 846
 847         if (reqbody->mbo_eadatasize > 0) {
 848                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 849                 if (buffer->lb_buf == NULL)
 850                         GOTO(out, rc = -EPROTO);
 851                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
 852                                                       RCL_SERVER);
 853         } else {
 854                 buffer->lb_buf = NULL;
 855                 buffer->lb_len = 0;
 856                 ma_need &= ~(MA_LOV | MA_LMV);
 857                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 858                        mdt_obd_name(info->mti_mdt),
 859                        req->rq_export->exp_client_uuid.uuid);
 860         }
 861
 862         /* If it is dir object and client require MEA, then we got MEA */
 863         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 864             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 865                 /* Assumption: MDT_MD size is enough for lmv size. */
 866                 ma->ma_lmv = buffer->lb_buf;
 867                 ma->ma_lmv_size = buffer->lb_len;
 868                 ma->ma_need = MA_INODE;
 869                 if (ma->ma_lmv_size > 0) {
 870                         if (reqbody->mbo_valid & OBD_MD_MEA)
 871                                 ma->ma_need |= MA_LMV;
 872                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
 873                                 ma->ma_need |= MA_LMV_DEF;
 874                 }
 875         } else {
 876                 ma->ma_lmm = buffer->lb_buf;
 877                 ma->ma_lmm_size = buffer->lb_len;
 878                 ma->ma_need = MA_INODE | MA_HSM;
 879                 if (ma->ma_lmm_size > 0)
 880                         ma->ma_need |= MA_LOV;
 881         }
 882
 883         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 884             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
 885             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 886                 /* get default stripe info for this dir. */
 887                 ma->ma_need |= MA_LOV_DEF;
 888         }
 889         ma->ma_need |= ma_need;
 890
 891         rc = mdt_attr_get_complex(info, o, ma);
 892         if (unlikely(rc)) {
 893                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 894                        mdt_obd_name(info->mti_mdt),
 895                        PFID(mdt_object_fid(o)), rc);
 896                 RETURN(rc);
 897         }
 898
 899         /* if file is released, check if a restore is running */
 900         if (ma->ma_valid & MA_HSM) {
 901                 repbody->mbo_valid |= OBD_MD_TSTATE;
 902                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
 903                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
 904                         repbody->mbo_t_state = MS_RESTORE;
 905         }
 906
 907         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 908
 909         /* the Lustre protocol supposes to return default striping
 910          * on the user-visible root if explicitly requested */
 911         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 912             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 913                 struct lu_fid      rootfid;
 914                 struct mdt_object *root;
 915                 struct mdt_device *mdt = info->mti_mdt;
 916
 917                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 918                 if (rc)
 919                         RETURN(rc);
 920                 root = mdt_object_find(env, mdt, &rootfid);
 921                 if (IS_ERR(root))
 922                         RETURN(PTR_ERR(root));
 923                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
 924                 mdt_object_put(info->mti_env, root);
 925                 if (unlikely(rc)) {
 926                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 927                                mdt_obd_name(info->mti_mdt),
 928                                PFID(mdt_object_fid(o)), rc);
 929                         RETURN(rc);
 930                 }
 931         }
 932
 933         if (likely(ma->ma_valid & MA_INODE))
 934                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 935         else
 936                 RETURN(-EFAULT);
 937
 938         if (mdt_body_has_lov(la, reqbody)) {
 939                 if (ma->ma_valid & MA_LOV) {
 940                         LASSERT(ma->ma_lmm_size);
 941                         repbody->mbo_eadatasize = ma->ma_lmm_size;
 942                         if (S_ISDIR(la->la_mode))
 943                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
 944                         else
 945                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
 946                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
 947                 }
 948                 if (ma->ma_valid & MA_LMV) {
 949                         /* Return -ENOTSUPP for old client */
 950                         if (!mdt_is_striped_client(req->rq_export))
 951                                 RETURN(-ENOTSUPP);
 952
 953                         LASSERT(S_ISDIR(la->la_mode));
 954                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
 955                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 956                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 957                 }
 958                 if (ma->ma_valid & MA_LMV_DEF) {
 959                         /* Return -ENOTSUPP for old client */
 960                         if (!mdt_is_striped_client(req->rq_export))
 961                                 RETURN(-ENOTSUPP);
 962                         LASSERT(S_ISDIR(la->la_mode));
 963                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 964                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
 965                                                OBD_MD_DEFAULT_MEA);
 966                 }
 967         } else if (S_ISLNK(la->la_mode) &&
 968                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
 969                 buffer->lb_buf = ma->ma_lmm;
 970                 /* eadatasize from client includes NULL-terminator, so
 971                  * there is no need to read it */
 972                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
 973                 rc = mo_readlink(env, next, buffer);
 974                 if (unlikely(rc <= 0)) {
 975                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 976                                mdt_obd_name(info->mti_mdt),
 977                                PFID(mdt_object_fid(o)), rc);
 978                         rc = -EFAULT;
 979                 } else {
 980                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 981
 982                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 983                                 rc -= 2;
 984                         repbody->mbo_valid |= OBD_MD_LINKNAME;
 985                         /* we need to report back size with NULL-terminator
 986                          * because client expects that */
 987                         repbody->mbo_eadatasize = rc + 1;
 988                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
 989                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 990                                        "on "DFID ", expected %d\n",
 991                                        mdt_obd_name(info->mti_mdt),
 992                                        rc, PFID(mdt_object_fid(o)),
 993                                        reqbody->mbo_eadatasize - 1);
 994                         /* NULL terminate */
 995                         ((char *)ma->ma_lmm)[rc] = 0;
 996
 997                         /* If the total CDEBUG() size is larger than a page, it
 998                          * will print a warning to the console, avoid this by
 999                          * printing just the last part of the symlink. */
1000                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1001                                print_limit < rc ? "..." : "", print_limit,
1002                                (char *)ma->ma_lmm + rc - print_limit, rc);
1003                         rc = 0;
1004                 }
1005         }
1006
1007         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1008                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1009                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1010                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1011                        repbody->mbo_max_mdsize);
1012         }
1013
1014         if (exp_connect_rmtclient(info->mti_exp) &&
1015             reqbody->mbo_valid & OBD_MD_FLRMTPERM) {
1016                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
1017
1018                 /* mdt_getattr_lock only */
1019                 rc = mdt_pack_remote_perm(info, o, buf);
1020                 if (rc) {
1021                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
1022                         repbody->mbo_aclsize = 0;
1023                         RETURN(rc);
1024                 } else {
1025                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
1026                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
1027                 }
1028         }
1029 #ifdef CONFIG_FS_POSIX_ACL
1030         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1031                  (reqbody->mbo_valid & OBD_MD_FLACL))
1032                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1033 #endif
1034
1035 out:
1036         if (rc == 0)
1037                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1038
1039         RETURN(rc);
1040 }
1041
1042 static int mdt_getattr(struct tgt_session_info *tsi)
1043 {
1044         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1045         struct mdt_object       *obj = info->mti_object;
1046         struct req_capsule      *pill = info->mti_pill;
1047         struct mdt_body         *reqbody;
1048         struct mdt_body         *repbody;
1049         int rc, rc2;
1050         ENTRY;
1051
1052         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1053         LASSERT(reqbody);
1054         LASSERT(obj != NULL);
1055         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1056
1057         /* Unlike intent case where we need to pre-fill out buffers early on
1058          * in intent policy for ldlm reasons, here we can have a much better
1059          * guess at EA size by just reading it from disk.
1060          * Exceptions are readdir and (missing) directory striping */
1061         /* Readlink */
1062         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1063                 /* No easy way to know how long is the symlink, but it cannot
1064                  * be more than PATH_MAX, so we allocate +1 */
1065                 rc = PATH_MAX + 1;
1066
1067         /* A special case for fs ROOT: getattr there might fetch
1068          * default EA for entire fs, not just for this dir!
1069          */
1070         } else if (lu_fid_eq(mdt_object_fid(obj),
1071                              &info->mti_mdt->mdt_md_root_fid) &&
1072                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1073                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1074                                                                  MDS_GETATTR)) {
1075                 /* Should the default strping be bigger, mdt_fix_reply
1076                  * will reallocate */
1077                 rc = DEF_REP_MD_SIZE;
1078         } else {
1079                 /* Read the actual EA size from disk */
1080                 rc = mdt_attr_get_eabuf_size(info, obj);
1081         }
1082
1083         if (rc < 0)
1084                 GOTO(out, rc = err_serious(rc));
1085
1086         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1087
1088         rc = req_capsule_server_pack(pill);
1089         if (unlikely(rc != 0))
1090                 GOTO(out, rc = err_serious(rc));
1091
1092         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1093         LASSERT(repbody != NULL);
1094         repbody->mbo_eadatasize = 0;
1095         repbody->mbo_aclsize = 0;
1096
1097         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1098                 rc = mdt_init_ucred(info, reqbody);
1099         else
1100                 rc = mdt_check_ucred(info);
1101         if (unlikely(rc))
1102                 GOTO(out_shrink, rc);
1103
1104         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1105
1106         rc = mdt_getattr_internal(info, obj, 0);
1107         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1108                 mdt_exit_ucred(info);
1109         EXIT;
1110 out_shrink:
1111         mdt_client_compatibility(info);
1112         rc2 = mdt_fix_reply(info);
1113         if (rc == 0)
1114                 rc = rc2;
1115 out:
1116         mdt_thread_info_fini(info);
1117         return rc;
1118 }
1119
1120 /**
1121  * Exchange MOF_LOV_CREATED flags between two objects after a
1122  * layout swap. No assumption is made on whether o1 or o2 have
1123  * created objects or not.
1124  *
1125  * \param[in,out] o1    First swap layout object
1126  * \param[in,out] o2    Second swap layout object
1127  */
1128 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1129 {
1130         __u64   o1_flags;
1131
1132         mutex_lock(&o1->mot_lov_mutex);
1133         mutex_lock(&o2->mot_lov_mutex);
1134
1135         o1_flags = o1->mot_flags;
1136         o1->mot_flags = (o1->mot_flags & ~MOF_LOV_CREATED) |
1137                         (o2->mot_flags & MOF_LOV_CREATED);
1138
1139         o2->mot_flags = (o2->mot_flags & ~MOF_LOV_CREATED) |
1140                         (o1_flags & MOF_LOV_CREATED);
1141
1142         mutex_unlock(&o2->mot_lov_mutex);
1143         mutex_unlock(&o1->mot_lov_mutex);
1144 }
1145
1146 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1147 {
1148         struct mdt_thread_info  *info;
1149         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1150         struct obd_export       *exp = req->rq_export;
1151         struct mdt_object       *o1, *o2, *o;
1152         struct mdt_lock_handle  *lh1, *lh2;
1153         struct mdc_swap_layouts *msl;
1154         int                      rc;
1155         ENTRY;
1156
1157         /* client does not support layout lock, so layout swaping
1158          * is disabled.
1159          * FIXME: there is a problem for old clients which don't support
1160          * layout lock yet. If those clients have already opened the file
1161          * they won't be notified at all so that old layout may still be
1162          * used to do IO. This can be fixed after file release is landed by
1163          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1164         if (!exp_connect_layout(exp))
1165                 RETURN(-EOPNOTSUPP);
1166
1167         info = tsi2mdt_info(tsi);
1168
1169         if (info->mti_dlm_req != NULL)
1170                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1171
1172         o1 = info->mti_object;
1173         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1174                                 &info->mti_body->mbo_fid2);
1175         if (IS_ERR(o))
1176                 GOTO(out, rc = PTR_ERR(o));
1177
1178         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1179                 GOTO(put, rc = -ENOENT);
1180
1181         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1182         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1183                 GOTO(put, rc);
1184
1185         if (rc < 0)
1186                 swap(o1, o2);
1187
1188         /* permission check. Make sure the calling process having permission
1189          * to write both files. */
1190         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1191                                 MAY_WRITE);
1192         if (rc < 0)
1193                 GOTO(put, rc);
1194
1195         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1196                                 MAY_WRITE);
1197         if (rc < 0)
1198                 GOTO(put, rc);
1199
1200         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1201         if (msl == NULL)
1202                 GOTO(put, rc = -EPROTO);
1203
1204         lh1 = &info->mti_lh[MDT_LH_NEW];
1205         mdt_lock_reg_init(lh1, LCK_EX);
1206         lh2 = &info->mti_lh[MDT_LH_OLD];
1207         mdt_lock_reg_init(lh2, LCK_EX);
1208
1209         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1210                              MDS_INODELOCK_XATTR);
1211         if (rc < 0)
1212                 GOTO(put, rc);
1213
1214         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1215                              MDS_INODELOCK_XATTR);
1216         if (rc < 0)
1217                 GOTO(unlock1, rc);
1218
1219         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1220                              mdt_object_child(o2), msl->msl_flags);
1221         if (rc < 0)
1222                 GOTO(unlock2, rc);
1223
1224         mdt_swap_lov_flag(o1, o2);
1225
1226 unlock2:
1227         mdt_object_unlock(info, o2, lh2, rc);
1228 unlock1:
1229         mdt_object_unlock(info, o1, lh1, rc);
1230 put:
1231         mdt_object_put(info->mti_env, o);
1232 out:
1233         mdt_thread_info_fini(info);
1234         RETURN(rc);
1235 }
1236
1237 static int mdt_raw_lookup(struct mdt_thread_info *info,
1238                           struct mdt_object *parent,
1239                           const struct lu_name *lname,
1240                           struct ldlm_reply *ldlm_rep)
1241 {
1242         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1243         int              rc;
1244         ENTRY;
1245
1246         LASSERT(!info->mti_cross_ref);
1247
1248         /* Only got the fid of this obj by name */
1249         fid_zero(child_fid);
1250         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1251                         lname, child_fid, &info->mti_spec);
1252         if (rc == 0) {
1253                 struct mdt_body *repbody;
1254
1255                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1256                 repbody->mbo_fid1 = *child_fid;
1257                 repbody->mbo_valid = OBD_MD_FLID;
1258                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1259         } else if (rc == -ENOENT) {
1260                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1261         }
1262
1263         RETURN(rc);
1264 }
1265
1266 /*
1267  * UPDATE lock should be taken against parent, and be released before exit;
1268  * child_bits lock should be taken against child, and be returned back:
1269  *            (1)normal request should release the child lock;
1270  *            (2)intent request will grant the lock to client.
1271  */
1272 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1273                                  struct mdt_lock_handle *lhc,
1274                                  __u64 child_bits,
1275                                  struct ldlm_reply *ldlm_rep)
1276 {
1277         struct ptlrpc_request  *req       = mdt_info_req(info);
1278         struct mdt_body        *reqbody   = NULL;
1279         struct mdt_object      *parent    = info->mti_object;
1280         struct mdt_object      *child;
1281         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1282         struct lu_name         *lname     = NULL;
1283         struct mdt_lock_handle *lhp       = NULL;
1284         struct ldlm_lock       *lock;
1285         bool                    is_resent;
1286         bool                    try_layout;
1287         int                     ma_need = 0;
1288         int                     rc;
1289         ENTRY;
1290
1291         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1292         LASSERT(ergo(is_resent,
1293                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1294
1295         if (parent == NULL)
1296                 RETURN(-ENOENT);
1297
1298         if (info->mti_cross_ref) {
1299                 /* Only getattr on the child. Parent is on another node. */
1300                 mdt_set_disposition(info, ldlm_rep,
1301                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1302                 child = parent;
1303                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1304                        "ldlm_rep = %p\n",
1305                        PFID(mdt_object_fid(child)), ldlm_rep);
1306
1307                 rc = mdt_check_resent_lock(info, child, lhc);
1308                 if (rc < 0) {
1309                         RETURN(rc);
1310                 } else if (rc > 0) {
1311                         mdt_lock_handle_init(lhc);
1312                         mdt_lock_reg_init(lhc, LCK_PR);
1313
1314                         /*
1315                          * Object's name is on another MDS, no lookup or layout
1316                          * lock is needed here but update lock is.
1317                          */
1318                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1319                                         MDS_INODELOCK_LAYOUT);
1320                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1321
1322                         rc = mdt_object_lock(info, child, lhc, child_bits);
1323                         if (rc < 0)
1324                                 RETURN(rc);
1325                 }
1326
1327                 /* Finally, we can get attr for child. */
1328                 if (!mdt_object_exists(child)) {
1329                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1330                                         &child->mot_obj,
1331                                         "remote object doesn't exist.\n");
1332                         mdt_object_unlock(info, child, lhc, 1);
1333                         RETURN(-ENOENT);
1334                 }
1335
1336                 rc = mdt_getattr_internal(info, child, 0);
1337                 if (unlikely(rc != 0))
1338                         mdt_object_unlock(info, child, lhc, 1);
1339
1340                 RETURN(rc);
1341         }
1342
1343         lname = &info->mti_name;
1344         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1345
1346         if (lu_name_is_valid(lname)) {
1347                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1348                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1349                        PNAME(lname), ldlm_rep);
1350         } else {
1351                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1352                 if (unlikely(reqbody == NULL))
1353                         RETURN(err_serious(-EPROTO));
1354
1355                 *child_fid = reqbody->mbo_fid2;
1356
1357                 if (unlikely(!fid_is_sane(child_fid)))
1358                         RETURN(err_serious(-EINVAL));
1359
1360                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1361                        "ldlm_rep = %p\n",
1362                        PFID(mdt_object_fid(parent)),
1363                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1364         }
1365
1366         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1367
1368         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1369                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1370                                 &parent->mot_obj,
1371                                 "Parent doesn't exist!\n");
1372                 RETURN(-ESTALE);
1373         }
1374
1375         if (mdt_object_remote(parent)) {
1376                 CERROR("%s: parent "DFID" is on remote target\n",
1377                        mdt_obd_name(info->mti_mdt),
1378                        PFID(mdt_object_fid(parent)));
1379                 RETURN(-EIO);
1380         }
1381
1382         if (lu_name_is_valid(lname)) {
1383                 /* Always allow to lookup ".." */
1384                 if (unlikely(lname->ln_namelen == 2 &&
1385                              lname->ln_name[0] == '.' &&
1386                              lname->ln_name[1] == '.'))
1387                         info->mti_spec.sp_permitted = 1;
1388
1389                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1390                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1391
1392                         RETURN(rc);
1393                 }
1394
1395                 /* step 1: lock parent only if parent is a directory */
1396                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1397                         lhp = &info->mti_lh[MDT_LH_PARENT];
1398                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1399                         rc = mdt_object_lock(info, parent, lhp,
1400                                              MDS_INODELOCK_UPDATE);
1401                         if (unlikely(rc != 0))
1402                                 RETURN(rc);
1403                 }
1404
1405                 /* step 2: lookup child's fid by name */
1406                 fid_zero(child_fid);
1407                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1408                                 child_fid, &info->mti_spec);
1409                 if (rc == -ENOENT)
1410                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1411
1412                 if (rc != 0)
1413                         GOTO(out_parent, rc);
1414         }
1415
1416         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1417
1418         /*
1419          *step 3: find the child object by fid & lock it.
1420          *        regardless if it is local or remote.
1421          *
1422          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1423          *      set parent dir fid the same as child fid in getattr by fid case
1424          *      we should not lu_object_find() the object again, could lead
1425          *      to hung if there is a concurrent unlink destroyed the object.
1426          */
1427         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1428                 mdt_object_get(info->mti_env, parent);
1429                 child = parent;
1430         } else {
1431                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1432                                         child_fid);
1433         }
1434
1435         if (unlikely(IS_ERR(child)))
1436                 GOTO(out_parent, rc = PTR_ERR(child));
1437
1438         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1439         rc = mdt_check_resent_lock(info, child, lhc);
1440         if (rc < 0) {
1441                 GOTO(out_child, rc);
1442         } else if (rc > 0) {
1443                 mdt_lock_handle_init(lhc);
1444                 mdt_lock_reg_init(lhc, LCK_PR);
1445                 try_layout = false;
1446
1447                 if (!mdt_object_exists(child)) {
1448                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1449                                         &child->mot_obj,
1450                                         "Object doesn't exist!\n");
1451                         GOTO(out_child, rc = -ENOENT);
1452                 }
1453
1454                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1455                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1456                         struct md_attr *ma = &info->mti_attr;
1457
1458                         ma->ma_valid = 0;
1459                         ma->ma_need = MA_INODE;
1460                         rc = mdt_attr_get_complex(info, child, ma);
1461                         if (unlikely(rc != 0))
1462                                 GOTO(out_child, rc);
1463
1464                         /* If the file has not been changed for some time, we
1465                          * return not only a LOOKUP lock, but also an UPDATE
1466                          * lock and this might save us RPC on later STAT. For
1467                          * directories, it also let negative dentry cache start
1468                          * working for this dir. */
1469                         if (ma->ma_valid & MA_INODE &&
1470                             ma->ma_attr.la_valid & LA_CTIME &&
1471                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1472                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1473                                 child_bits |= MDS_INODELOCK_UPDATE;
1474                 }
1475
1476                 /* layout lock must be granted in a best-effort way
1477                  * for IT operations */
1478                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1479                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1480                     exp_connect_layout(info->mti_exp) &&
1481                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1482                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1483                         /* try to grant layout lock for regular file. */
1484                         try_layout = true;
1485                 }
1486
1487                 rc = 0;
1488                 if (try_layout) {
1489                         child_bits |= MDS_INODELOCK_LAYOUT;
1490                         /* try layout lock, it may fail to be granted due to
1491                          * contention at LOOKUP or UPDATE */
1492                         if (!mdt_object_lock_try(info, child, lhc,
1493                                                  child_bits)) {
1494                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1495                                 LASSERT(child_bits != 0);
1496                                 rc = mdt_object_lock(info, child, lhc,
1497                                                      child_bits);
1498                         } else {
1499                                 ma_need |= MA_LOV;
1500                         }
1501                 } else {
1502                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1503                          * client will enqueue the lock to the remote MDT */
1504                         if (mdt_object_remote(child))
1505                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1506                         rc = mdt_object_lock(info, child, lhc, child_bits);
1507                 }
1508                 if (unlikely(rc != 0))
1509                         GOTO(out_child, rc);
1510         }
1511
1512         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1513
1514         /* finally, we can get attr for child. */
1515         rc = mdt_getattr_internal(info, child, ma_need);
1516         if (unlikely(rc != 0)) {
1517                 mdt_object_unlock(info, child, lhc, 1);
1518         } else if (lock) {
1519                 /* Debugging code. */
1520                 LDLM_DEBUG(lock, "Returning lock to client");
1521                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1522                                          &lock->l_resource->lr_name),
1523                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1524                          PLDLMRES(lock->l_resource),
1525                          PFID(mdt_object_fid(child)));
1526         }
1527         if (lock)
1528                 LDLM_LOCK_PUT(lock);
1529
1530         EXIT;
1531 out_child:
1532         mdt_object_put(info->mti_env, child);
1533 out_parent:
1534         if (lhp)
1535                 mdt_object_unlock(info, parent, lhp, 1);
1536         return rc;
1537 }
1538
1539 /* normal handler: should release the child lock */
1540 static int mdt_getattr_name(struct tgt_session_info *tsi)
1541 {
1542         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1543         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1544         struct mdt_body        *reqbody;
1545         struct mdt_body        *repbody;
1546         int rc, rc2;
1547         ENTRY;
1548
1549         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1550         LASSERT(reqbody != NULL);
1551         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1552         LASSERT(repbody != NULL);
1553
1554         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1555         repbody->mbo_eadatasize = 0;
1556         repbody->mbo_aclsize = 0;
1557
1558         rc = mdt_init_ucred(info, reqbody);
1559         if (unlikely(rc))
1560                 GOTO(out_shrink, rc);
1561
1562         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1563         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1564                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1565                 lhc->mlh_reg_lh.cookie = 0;
1566         }
1567         mdt_exit_ucred(info);
1568         EXIT;
1569 out_shrink:
1570         mdt_client_compatibility(info);
1571         rc2 = mdt_fix_reply(info);
1572         if (rc == 0)
1573                 rc = rc2;
1574         mdt_thread_info_fini(info);
1575         return rc;
1576 }
1577
1578 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1579                          void *karg, void *uarg);
1580
1581 static int mdt_set_info(struct tgt_session_info *tsi)
1582 {
1583         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1584         char                    *key;
1585         void                    *val;
1586         int                      keylen, vallen, rc = 0;
1587
1588         ENTRY;
1589
1590         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1591         if (key == NULL) {
1592                 DEBUG_REQ(D_HA, req, "no set_info key");
1593                 RETURN(err_serious(-EFAULT));
1594         }
1595
1596         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1597                                       RCL_CLIENT);
1598
1599         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1600         if (val == NULL) {
1601                 DEBUG_REQ(D_HA, req, "no set_info val");
1602                 RETURN(err_serious(-EFAULT));
1603         }
1604
1605         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1606                                       RCL_CLIENT);
1607
1608         /* Swab any part of val you need to here */
1609         if (KEY_IS(KEY_READ_ONLY)) {
1610                 spin_lock(&req->rq_export->exp_lock);
1611                 if (*(__u32 *)val)
1612                         *exp_connect_flags_ptr(req->rq_export) |=
1613                                 OBD_CONNECT_RDONLY;
1614                 else
1615                         *exp_connect_flags_ptr(req->rq_export) &=
1616                                 ~OBD_CONNECT_RDONLY;
1617                 spin_unlock(&req->rq_export->exp_lock);
1618         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1619                 struct changelog_setinfo *cs = val;
1620
1621                 if (vallen != sizeof(*cs)) {
1622                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1623                                tgt_name(tsi->tsi_tgt), vallen);
1624                         RETURN(-EINVAL);
1625                 }
1626                 if (ptlrpc_req_need_swab(req)) {
1627                         __swab64s(&cs->cs_recno);
1628                         __swab32s(&cs->cs_id);
1629                 }
1630
1631                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1632                                    vallen, val, NULL);
1633         } else {
1634                 RETURN(-EINVAL);
1635         }
1636         RETURN(rc);
1637 }
1638
1639 static int mdt_readpage(struct tgt_session_info *tsi)
1640 {
1641         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1642         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1643         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1644         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1645         struct mdt_body         *repbody;
1646         int                      rc;
1647         int                      i;
1648
1649         ENTRY;
1650
1651         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1652                 RETURN(err_serious(-ENOMEM));
1653
1654         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1655         if (repbody == NULL || reqbody == NULL)
1656                 RETURN(err_serious(-EFAULT));
1657
1658         /*
1659          * prepare @rdpg before calling lower layers and transfer itself. Here
1660          * reqbody->size contains offset of where to start to read and
1661          * reqbody->nlink contains number bytes to read.
1662          */
1663         rdpg->rp_hash = reqbody->mbo_size;
1664         if (rdpg->rp_hash != reqbody->mbo_size) {
1665                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1666                        rdpg->rp_hash, reqbody->mbo_size);
1667                 RETURN(-EFAULT);
1668         }
1669
1670         rdpg->rp_attrs = reqbody->mbo_mode;
1671         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1672                 rdpg->rp_attrs |= LUDA_64BITHASH;
1673         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1674                                 exp_max_brw_size(tsi->tsi_exp));
1675         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1676                           PAGE_CACHE_SHIFT;
1677         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1678         if (rdpg->rp_pages == NULL)
1679                 RETURN(-ENOMEM);
1680
1681         for (i = 0; i < rdpg->rp_npages; ++i) {
1682                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1683                 if (rdpg->rp_pages[i] == NULL)
1684                         GOTO(free_rdpg, rc = -ENOMEM);
1685         }
1686
1687         /* call lower layers to fill allocated pages with directory data */
1688         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1689         if (rc < 0)
1690                 GOTO(free_rdpg, rc);
1691
1692         /* send pages to client */
1693         rc = tgt_sendpage(tsi, rdpg, rc);
1694
1695         EXIT;
1696 free_rdpg:
1697
1698         for (i = 0; i < rdpg->rp_npages; i++)
1699                 if (rdpg->rp_pages[i] != NULL)
1700                         __free_page(rdpg->rp_pages[i]);
1701         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1702
1703         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1704                 RETURN(0);
1705
1706         return rc;
1707 }
1708
1709 static int mdt_reint_internal(struct mdt_thread_info *info,
1710                               struct mdt_lock_handle *lhc,
1711                               __u32 op)
1712 {
1713         struct req_capsule      *pill = info->mti_pill;
1714         struct mdt_body         *repbody;
1715         int                      rc = 0, rc2;
1716
1717         ENTRY;
1718
1719         rc = mdt_reint_unpack(info, op);
1720         if (rc != 0) {
1721                 CERROR("Can't unpack reint, rc %d\n", rc);
1722                 RETURN(err_serious(rc));
1723         }
1724
1725         /* for replay (no_create) lmm is not needed, client has it already */
1726         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1727                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1728                                      DEF_REP_MD_SIZE);
1729
1730         /* llog cookies are always 0, the field is kept for compatibility */
1731         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1732                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1733
1734         rc = req_capsule_server_pack(pill);
1735         if (rc != 0) {
1736                 CERROR("Can't pack response, rc %d\n", rc);
1737                 RETURN(err_serious(rc));
1738         }
1739
1740         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1741                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1742                 LASSERT(repbody);
1743                 repbody->mbo_eadatasize = 0;
1744                 repbody->mbo_aclsize = 0;
1745         }
1746
1747         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1748
1749         /* for replay no cookkie / lmm need, because client have this already */
1750         if (info->mti_spec.no_create)
1751                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1752                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1753
1754         rc = mdt_init_ucred_reint(info);
1755         if (rc)
1756                 GOTO(out_shrink, rc);
1757
1758         rc = mdt_fix_attr_ucred(info, op);
1759         if (rc != 0)
1760                 GOTO(out_ucred, rc = err_serious(rc));
1761
1762         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
1763         if (rc < 0) {
1764                 GOTO(out_ucred, rc);
1765         } else if (rc == 1) {
1766                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1767                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1768                 GOTO(out_ucred, rc);
1769         }
1770         rc = mdt_reint_rec(info, lhc);
1771         EXIT;
1772 out_ucred:
1773         mdt_exit_ucred(info);
1774 out_shrink:
1775         mdt_client_compatibility(info);
1776         rc2 = mdt_fix_reply(info);
1777         if (rc == 0)
1778                 rc = rc2;
1779         return rc;
1780 }
1781
1782 static long mdt_reint_opcode(struct ptlrpc_request *req,
1783                              const struct req_format **fmt)
1784 {
1785         struct mdt_device       *mdt;
1786         struct mdt_rec_reint    *rec;
1787         long                     opc;
1788
1789         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1790         if (rec != NULL) {
1791                 opc = rec->rr_opcode;
1792                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1793                 if (opc < REINT_MAX && fmt[opc] != NULL)
1794                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1795                 else {
1796                         mdt = mdt_exp2dev(req->rq_export);
1797                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1798                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1799                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1800                         opc = err_serious(-EFAULT);
1801                 }
1802         } else {
1803                 opc = err_serious(-EFAULT);
1804         }
1805         return opc;
1806 }
1807
1808 static int mdt_reint(struct tgt_session_info *tsi)
1809 {
1810         long opc;
1811         int  rc;
1812         static const struct req_format *reint_fmts[REINT_MAX] = {
1813                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1814                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1815                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1816                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1817                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1818                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1819                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1820                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1821                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1822         };
1823
1824         ENTRY;
1825
1826         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1827         if (opc >= 0) {
1828                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1829                 /*
1830                  * No lock possible here from client to pass it to reint code
1831                  * path.
1832                  */
1833                 rc = mdt_reint_internal(info, NULL, opc);
1834                 mdt_thread_info_fini(info);
1835         } else {
1836                 rc = opc;
1837         }
1838
1839         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1840         RETURN(rc);
1841 }
1842
1843 /* this should sync the whole device */
1844 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1845 {
1846         struct dt_device *dt = mdt->mdt_bottom;
1847         int rc;
1848         ENTRY;
1849
1850         rc = dt->dd_ops->dt_sync(env, dt);
1851         RETURN(rc);
1852 }
1853
1854 /* this should sync this object */
1855 static int mdt_object_sync(struct mdt_thread_info *info)
1856 {
1857         struct md_object *next;
1858         int rc;
1859         ENTRY;
1860
1861         if (!mdt_object_exists(info->mti_object)) {
1862                 CWARN("%s: non existing object "DFID": rc = %d\n",
1863                       mdt_obd_name(info->mti_mdt),
1864                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
1865                 RETURN(-ESTALE);
1866         }
1867         next = mdt_object_child(info->mti_object);
1868         rc = mo_object_sync(info->mti_env, next);
1869
1870         RETURN(rc);
1871 }
1872
1873 static int mdt_sync(struct tgt_session_info *tsi)
1874 {
1875         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1876         struct req_capsule      *pill = tsi->tsi_pill;
1877         struct mdt_body         *body;
1878         int                      rc;
1879
1880         ENTRY;
1881
1882         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1883                 RETURN(err_serious(-ENOMEM));
1884
1885         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
1886                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1887         } else {
1888                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1889
1890                 /* sync an object */
1891                 rc = mdt_object_sync(info);
1892                 if (rc == 0) {
1893                         const struct lu_fid *fid;
1894                         struct lu_attr *la = &info->mti_attr.ma_attr;
1895
1896                         info->mti_attr.ma_need = MA_INODE;
1897                         info->mti_attr.ma_valid = 0;
1898                         rc = mdt_attr_get_complex(info, info->mti_object,
1899                                                   &info->mti_attr);
1900                         if (rc == 0) {
1901                                 body = req_capsule_server_get(pill,
1902                                                               &RMF_MDT_BODY);
1903                                 fid = mdt_object_fid(info->mti_object);
1904                                 mdt_pack_attr2body(info, body, la, fid);
1905                         }
1906                 }
1907                 mdt_thread_info_fini(info);
1908         }
1909         if (rc == 0)
1910                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1911
1912         RETURN(rc);
1913 }
1914
1915 /*
1916  * Handle quota control requests to consult current usage/limit, but also
1917  * to configure quota enforcement
1918  */
1919 static int mdt_quotactl(struct tgt_session_info *tsi)
1920 {
1921         struct obd_export       *exp  = tsi->tsi_exp;
1922         struct req_capsule      *pill = tsi->tsi_pill;
1923         struct obd_quotactl     *oqctl, *repoqc;
1924         int                      id, rc;
1925         struct mdt_device       *mdt = mdt_exp2dev(exp);
1926         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1927         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
1928         ENTRY;
1929
1930         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1931         if (oqctl == NULL)
1932                 RETURN(err_serious(-EPROTO));
1933
1934         rc = req_capsule_server_pack(pill);
1935         if (rc)
1936                 RETURN(err_serious(rc));
1937
1938         switch (oqctl->qc_cmd) {
1939                 /* master quotactl */
1940         case Q_SETINFO:
1941         case Q_SETQUOTA:
1942                 if (!nodemap_can_setquota(nodemap))
1943                         RETURN(-EPERM);
1944         case Q_GETINFO:
1945         case Q_GETQUOTA:
1946                 if (qmt == NULL)
1947                         RETURN(-EOPNOTSUPP);
1948                 /* slave quotactl */
1949         case Q_GETOINFO:
1950         case Q_GETOQUOTA:
1951                 break;
1952         default:
1953                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1954                 RETURN(-EFAULT);
1955         }
1956
1957         /* map uid/gid for remote client */
1958         id = oqctl->qc_id;
1959         if (exp_connect_rmtclient(exp)) {
1960                 struct lustre_idmap_table *idmap;
1961
1962                 idmap = exp->exp_mdt_data.med_idmap;
1963
1964                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
1965                              oqctl->qc_cmd != Q_GETINFO))
1966                         RETURN(-EPERM);
1967
1968                 if (oqctl->qc_type == USRQUOTA)
1969                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
1970                                                      oqctl->qc_id);
1971                 else if (oqctl->qc_type == GRPQUOTA)
1972                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
1973                                                      oqctl->qc_id);
1974                 else
1975                         RETURN(-EINVAL);
1976
1977                 if (id == CFS_IDMAP_NOTFOUND) {
1978                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
1979                         RETURN(-EACCES);
1980                 }
1981         }
1982
1983         if (oqctl->qc_type == USRQUOTA)
1984                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1985                                     NODEMAP_CLIENT_TO_FS, id);
1986         else if (oqctl->qc_type == GRPQUOTA)
1987                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1988                                     NODEMAP_CLIENT_TO_FS, id);
1989
1990         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
1991         if (repoqc == NULL)
1992                 RETURN(err_serious(-EFAULT));
1993
1994         if (oqctl->qc_id != id)
1995                 swap(oqctl->qc_id, id);
1996
1997         switch (oqctl->qc_cmd) {
1998
1999         case Q_GETINFO:
2000         case Q_SETINFO:
2001         case Q_SETQUOTA:
2002         case Q_GETQUOTA:
2003                 /* forward quotactl request to QMT */
2004                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2005                 break;
2006
2007         case Q_GETOINFO:
2008         case Q_GETOQUOTA:
2009                 /* slave quotactl */
2010                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2011                                    oqctl);
2012                 break;
2013
2014         default:
2015                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2016                 RETURN(-EFAULT);
2017         }
2018
2019         if (oqctl->qc_id != id)
2020                 swap(oqctl->qc_id, id);
2021
2022         *repoqc = *oqctl;
2023         RETURN(rc);
2024 }
2025
2026 /** clone llog ctxt from child (mdd)
2027  * This allows remote llog (replicator) access.
2028  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2029  * context was originally set up, or we can handle them directly.
2030  * I choose the latter, but that means I need any llog
2031  * contexts set up by child to be accessable by the mdt.  So we clone the
2032  * context into our context list here.
2033  */
2034 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2035                                int idx)
2036 {
2037         struct md_device  *next = mdt->mdt_child;
2038         struct llog_ctxt *ctxt;
2039         int rc;
2040
2041         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2042                 return 0;
2043
2044         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2045         if (rc || ctxt == NULL) {
2046                 return 0;
2047         }
2048
2049         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2050         if (rc)
2051                 CERROR("Can't set mdt ctxt %d\n", rc);
2052
2053         return rc;
2054 }
2055
2056 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2057                                  struct mdt_device *mdt, int idx)
2058 {
2059         struct llog_ctxt *ctxt;
2060
2061         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2062         if (ctxt == NULL)
2063                 return 0;
2064         /* Put once for the get we just did, and once for the clone */
2065         llog_ctxt_put(ctxt);
2066         llog_ctxt_put(ctxt);
2067         return 0;
2068 }
2069
2070 /*
2071  * sec context handlers
2072  */
2073 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2074 {
2075         int rc;
2076
2077         rc = mdt_handle_idmap(tsi);
2078         if (unlikely(rc)) {
2079                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2080                 __u32                    opc;
2081
2082                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2083                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2084                         sptlrpc_svc_ctx_invalidate(req);
2085         }
2086
2087         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2088
2089         return rc;
2090 }
2091
2092 /*
2093  * quota request handlers
2094  */
2095 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2096 {
2097         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2098         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2099         int                      rc;
2100         ENTRY;
2101
2102         if (qmt == NULL)
2103                 RETURN(err_serious(-EOPNOTSUPP));
2104
2105         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2106         RETURN(rc);
2107 }
2108
2109 struct mdt_object *mdt_object_new(const struct lu_env *env,
2110                                   struct mdt_device *d,
2111                                   const struct lu_fid *f)
2112 {
2113         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2114         struct lu_object *o;
2115         struct mdt_object *m;
2116         ENTRY;
2117
2118         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2119         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2120         if (unlikely(IS_ERR(o)))
2121                 m = (struct mdt_object *)o;
2122         else
2123                 m = mdt_obj(o);
2124         RETURN(m);
2125 }
2126
2127 struct mdt_object *mdt_object_find(const struct lu_env *env,
2128                                    struct mdt_device *d,
2129                                    const struct lu_fid *f)
2130 {
2131         struct lu_object *o;
2132         struct mdt_object *m;
2133         ENTRY;
2134
2135         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2136         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2137         if (unlikely(IS_ERR(o)))
2138                 m = (struct mdt_object *)o;
2139         else
2140                 m = mdt_obj(o);
2141
2142         RETURN(m);
2143 }
2144
2145 /**
2146  * Asyncronous commit for mdt device.
2147  *
2148  * Pass asynchonous commit call down the MDS stack.
2149  *
2150  * \param env environment
2151  * \param mdt the mdt device
2152  */
2153 static void mdt_device_commit_async(const struct lu_env *env,
2154                                     struct mdt_device *mdt)
2155 {
2156         struct dt_device *dt = mdt->mdt_bottom;
2157         int rc;
2158
2159         rc = dt->dd_ops->dt_commit_async(env, dt);
2160         if (unlikely(rc != 0))
2161                 CWARN("%s: async commit start failed: rc = %d\n",
2162                       mdt_obd_name(mdt), rc);
2163 }
2164
2165 /**
2166  * Mark the lock as "synchonous".
2167  *
2168  * Mark the lock to deffer transaction commit to the unlock time.
2169  *
2170  * \param lock the lock to mark as "synchonous"
2171  *
2172  * \see mdt_is_lock_sync
2173  * \see mdt_save_lock
2174  */
2175 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2176 {
2177         lock->l_ast_data = (void*)1;
2178 }
2179
2180 /**
2181  * Check whehter the lock "synchonous" or not.
2182  *
2183  * \param lock the lock to check
2184  * \retval 1 the lock is "synchonous"
2185  * \retval 0 the lock isn't "synchronous"
2186  *
2187  * \see mdt_set_lock_sync
2188  * \see mdt_save_lock
2189  */
2190 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2191 {
2192         return lock->l_ast_data != NULL;
2193 }
2194
2195 /**
2196  * Blocking AST for mdt locks.
2197  *
2198  * Starts transaction commit if in case of COS lock conflict or
2199  * deffers such a commit to the mdt_save_lock.
2200  *
2201  * \param lock the lock which blocks a request or cancelling lock
2202  * \param desc unused
2203  * \param data unused
2204  * \param flag indicates whether this cancelling or blocking callback
2205  * \retval 0
2206  * \see ldlm_blocking_ast_nocheck
2207  */
2208 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2209                      void *data, int flag)
2210 {
2211         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2212         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2213         int rc;
2214         ENTRY;
2215
2216         if (flag == LDLM_CB_CANCELING)
2217                 RETURN(0);
2218         lock_res_and_lock(lock);
2219         if (lock->l_blocking_ast != mdt_blocking_ast) {
2220                 unlock_res_and_lock(lock);
2221                 RETURN(0);
2222         }
2223         if (mdt_cos_is_enabled(mdt) &&
2224             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2225             lock->l_blocking_lock != NULL &&
2226             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2227                 mdt_set_lock_sync(lock);
2228         }
2229         rc = ldlm_blocking_ast_nocheck(lock);
2230
2231         /* There is no lock conflict if l_blocking_lock == NULL,
2232          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2233          * when the last reference to a local lock was released */
2234         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2235                 struct lu_env env;
2236
2237                 rc = lu_env_init(&env, LCT_LOCAL);
2238                 if (unlikely(rc != 0))
2239                         CWARN("%s: lu_env initialization failed, cannot "
2240                               "start asynchronous commit: rc = %d\n",
2241                               obd->obd_name, rc);
2242                 else
2243                         mdt_device_commit_async(&env, mdt);
2244                 lu_env_fini(&env);
2245         }
2246         RETURN(rc);
2247 }
2248
2249 /* Used for cross-MDT lock */
2250 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2251                             void *data, int flag)
2252 {
2253         struct lustre_handle lockh;
2254         int               rc;
2255
2256         switch (flag) {
2257         case LDLM_CB_BLOCKING:
2258                 ldlm_lock2handle(lock, &lockh);
2259                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2260                 if (rc < 0) {
2261                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2262                         RETURN(rc);
2263                 }
2264                 break;
2265         case LDLM_CB_CANCELING:
2266                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2267                 break;
2268         default:
2269                 LBUG();
2270         }
2271         RETURN(0);
2272 }
2273
2274 int mdt_check_resent_lock(struct mdt_thread_info *info,
2275                           struct mdt_object *mo,
2276                           struct mdt_lock_handle *lhc)
2277 {
2278         /* the lock might already be gotten in ldlm_handle_enqueue() */
2279         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2280                 struct ptlrpc_request *req = mdt_info_req(info);
2281                 struct ldlm_lock      *lock;
2282
2283                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2284                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2285                 if (lock == NULL) {
2286                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2287                          * a resend case, however, it could be already destroyed
2288                          * due to client eviction or a raced cancel RPC. */
2289                         LDLM_DEBUG_NOLOCK("Invalid lock handle "LPX64"\n",
2290                                           lhc->mlh_reg_lh.cookie);
2291                         RETURN(-ESTALE);
2292                 }
2293
2294                 if (!fid_res_name_eq(mdt_object_fid(mo),
2295                                      &lock->l_resource->lr_name)) {
2296                         CWARN("%s: Although resent, but still not "
2297                               "get child lock:"DFID"\n",
2298                               info->mti_exp->exp_obd->obd_name,
2299                               PFID(mdt_object_fid(mo)));
2300                         LDLM_LOCK_PUT(lock);
2301                         RETURN(-EPROTO);
2302                 }
2303                 LDLM_LOCK_PUT(lock);
2304                 return 0;
2305         }
2306         return 1;
2307 }
2308
2309 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2310                            struct mdt_object *o, const struct lu_fid *fid,
2311                            struct lustre_handle *lh, ldlm_mode_t mode,
2312                            __u64 ibits)
2313 {
2314         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2315         ldlm_policy_data_t *policy = &mti->mti_policy;
2316         struct ldlm_res_id *res_id = &mti->mti_res_id;
2317         int rc = 0;
2318         ENTRY;
2319
2320         LASSERT(mdt_object_remote(o));
2321
2322         fid_build_reg_res_name(fid, res_id);
2323
2324         memset(einfo, 0, sizeof(*einfo));
2325         einfo->ei_type = LDLM_IBITS;
2326         einfo->ei_mode = mode;
2327         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2328         einfo->ei_cb_cp = ldlm_completion_ast;
2329         einfo->ei_enq_slave = 0;
2330         einfo->ei_res_id = res_id;
2331
2332         memset(policy, 0, sizeof(*policy));
2333         policy->l_inodebits.bits = ibits;
2334
2335         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2336                             policy);
2337         RETURN(rc);
2338 }
2339
2340 static int mdt_object_local_lock(struct mdt_thread_info *info,
2341                                  struct mdt_object *o,
2342                                  struct mdt_lock_handle *lh, __u64 ibits,
2343                                  bool nonblock)
2344 {
2345         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2346         ldlm_policy_data_t *policy = &info->mti_policy;
2347         struct ldlm_res_id *res_id = &info->mti_res_id;
2348         __u64 dlmflags;
2349         int rc;
2350         ENTRY;
2351
2352         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2353         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2354         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2355         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2356
2357         /* Only enqueue LOOKUP lock for remote object */
2358         if (mdt_object_remote(o))
2359                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2360
2361         if (lh->mlh_type == MDT_PDO_LOCK) {
2362                 /* check for exists after object is locked */
2363                 if (mdt_object_exists(o) == 0) {
2364                         /* Non-existent object shouldn't have PDO lock */
2365                         RETURN(-ESTALE);
2366                 } else {
2367                         /* Non-dir object shouldn't have PDO lock */
2368                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2369                                 RETURN(-ENOTDIR);
2370                 }
2371         }
2372
2373         memset(policy, 0, sizeof(*policy));
2374         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2375
2376         dlmflags = LDLM_FL_ATOMIC_CB;
2377         if (nonblock)
2378                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2379
2380         /*
2381          * Take PDO lock on whole directory and build correct @res_id for lock
2382          * on part of directory.
2383          */
2384         if (lh->mlh_pdo_hash != 0) {
2385                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2386                 mdt_lock_pdo_mode(info, o, lh);
2387                 if (lh->mlh_pdo_mode != LCK_NL) {
2388                         /*
2389                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2390                          * is never going to be sent to client and we do not
2391                          * want it slowed down due to possible cancels.
2392                          */
2393                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2394                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2395                                           policy, res_id, dlmflags,
2396                                           info->mti_exp == NULL ? NULL :
2397                                           &info->mti_exp->exp_handle.h_cookie);
2398                         if (unlikely(rc != 0))
2399                                 GOTO(out_unlock, rc);
2400                 }
2401
2402                 /*
2403                  * Finish res_id initializing by name hash marking part of
2404                  * directory which is taking modification.
2405                  */
2406                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2407         }
2408
2409         policy->l_inodebits.bits = ibits;
2410
2411         /*
2412          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2413          * going to be sent to client. If it is - mdt_intent_policy() path will
2414          * fix it up and turn FL_LOCAL flag off.
2415          */
2416         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2417                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2418                           info->mti_exp == NULL ? NULL :
2419                           &info->mti_exp->exp_handle.h_cookie);
2420 out_unlock:
2421         if (rc != 0)
2422                 mdt_object_unlock(info, o, lh, 1);
2423         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2424                    lh->mlh_pdo_hash != 0 &&
2425                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2426                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2427
2428         RETURN(rc);
2429 }
2430
2431 static int
2432 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2433                          struct mdt_lock_handle *lh, __u64 ibits,
2434                          bool nonblock)
2435 {
2436         int rc;
2437         ENTRY;
2438
2439         if (!mdt_object_remote(o))
2440                 return mdt_object_local_lock(info, o, lh, ibits, nonblock);
2441
2442         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2443         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2444                    MDS_INODELOCK_XATTR);
2445         if (ibits & MDS_INODELOCK_UPDATE) {
2446                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2447                  * enqueue RPC can only request 1 lock, to avoid extra
2448                  * RPC, so it will instead enqueue EX lock for remote
2449                  * object anyway XXX*/
2450                 if (lh->mlh_type == MDT_PDO_LOCK &&
2451                     lh->mlh_pdo_hash != 0) {
2452                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2453                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2454                                PFID(mdt_object_fid(o)));
2455                         lh->mlh_pdo_hash = 0;
2456                         lh->mlh_rreg_mode = LCK_EX;
2457                         lh->mlh_type = MDT_REG_LOCK;
2458                 }
2459                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2460                                             &lh->mlh_rreg_lh,
2461                                             lh->mlh_rreg_mode,
2462                                             MDS_INODELOCK_UPDATE);
2463                 if (rc != ELDLM_OK)
2464                         RETURN(rc);
2465         }
2466
2467         /* Only enqueue LOOKUP lock for remote object */
2468         if (ibits & MDS_INODELOCK_LOOKUP) {
2469                 rc = mdt_object_local_lock(info, o, lh,
2470                                            MDS_INODELOCK_LOOKUP,
2471                                            nonblock);
2472                 if (rc != ELDLM_OK)
2473                         RETURN(rc);
2474         }
2475
2476         RETURN(0);
2477 }
2478
2479 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2480                     struct mdt_lock_handle *lh, __u64 ibits)
2481 {
2482         return mdt_object_lock_internal(info, o, lh, ibits, false);
2483 }
2484
2485 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2486                         struct mdt_lock_handle *lh, __u64 ibits)
2487 {
2488         struct mdt_lock_handle tmp = *lh;
2489         int rc;
2490
2491         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true);
2492         if (rc == 0)
2493                 *lh = tmp;
2494
2495         return rc == 0;
2496 }
2497
2498 /**
2499  * Save a lock within request object.
2500  *
2501  * Keep the lock referenced until whether client ACK or transaction
2502  * commit happens or release the lock immediately depending on input
2503  * parameters. If COS is ON, a write lock is converted to COS lock
2504  * before saving.
2505  *
2506  * \param info thead info object
2507  * \param h lock handle
2508  * \param mode lock mode
2509  * \param decref force immediate lock releasing
2510  */
2511 static
2512 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2513                    ldlm_mode_t mode, int decref)
2514 {
2515         ENTRY;
2516
2517         if (lustre_handle_is_used(h)) {
2518                 if (decref || !info->mti_has_trans ||
2519                     !(mode & (LCK_PW | LCK_EX))){
2520                         mdt_fid_unlock(h, mode);
2521                 } else {
2522                         struct mdt_device *mdt = info->mti_mdt;
2523                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2524                         struct ptlrpc_request *req = mdt_info_req(info);
2525                         int no_ack = 0;
2526
2527                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2528                                  h->cookie);
2529                         /* there is no request if mdt_object_unlock() is called
2530                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2531                         if (likely(req != NULL)) {
2532                                 CDEBUG(D_HA, "request = %p reply state = %p"
2533                                        " transno = "LPD64"\n", req,
2534                                        req->rq_reply_state, req->rq_transno);
2535                                 if (mdt_cos_is_enabled(mdt)) {
2536                                         no_ack = 1;
2537                                         ldlm_lock_downgrade(lock, LCK_COS);
2538                                         mode = LCK_COS;
2539                                 }
2540                                 ptlrpc_save_lock(req, h, mode, no_ack);
2541                         } else {
2542                                 ldlm_lock_decref(h, mode);
2543                         }
2544                         if (mdt_is_lock_sync(lock)) {
2545                                 CDEBUG(D_HA, "found sync-lock,"
2546                                        " async commit started\n");
2547                                 mdt_device_commit_async(info->mti_env,
2548                                                         mdt);
2549                         }
2550                         LDLM_LOCK_PUT(lock);
2551                 }
2552                 h->cookie = 0ull;
2553         }
2554
2555         EXIT;
2556 }
2557
2558 /**
2559  * Unlock mdt object.
2560  *
2561  * Immeditely release the regular lock and the PDO lock or save the
2562  * lock in request and keep them referenced until client ACK or
2563  * transaction commit.
2564  *
2565  * \param info thread info object
2566  * \param o mdt object
2567  * \param lh mdt lock handle referencing regular and PDO locks
2568  * \param decref force immediate lock releasing
2569  */
2570 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2571                        struct mdt_lock_handle *lh, int decref)
2572 {
2573         ENTRY;
2574
2575         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2576         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2577
2578         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2579                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2580
2581         EXIT;
2582 }
2583
2584 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2585                                         const struct lu_fid *f,
2586                                         struct mdt_lock_handle *lh,
2587                                         __u64 ibits)
2588 {
2589         struct mdt_object *o;
2590
2591         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2592         if (!IS_ERR(o)) {
2593                 int rc;
2594
2595                 rc = mdt_object_lock(info, o, lh, ibits);
2596                 if (rc != 0) {
2597                         mdt_object_put(info->mti_env, o);
2598                         o = ERR_PTR(rc);
2599                 }
2600         }
2601         return o;
2602 }
2603
2604 void mdt_object_unlock_put(struct mdt_thread_info * info,
2605                            struct mdt_object * o,
2606                            struct mdt_lock_handle *lh,
2607                            int decref)
2608 {
2609         mdt_object_unlock(info, o, lh, decref);
2610         mdt_object_put(info->mti_env, o);
2611 }
2612
2613 /*
2614  * Generic code handling requests that have struct mdt_body passed in:
2615  *
2616  *  - extract mdt_body from request and save it in @info, if present;
2617  *
2618  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2619  *  @info;
2620  *
2621  *  - if HABEO_CORPUS flag is set for this request type check whether object
2622  *  actually exists on storage (lu_object_exists()).
2623  *
2624  */
2625 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2626 {
2627         const struct mdt_body    *body;
2628         struct mdt_object        *obj;
2629         const struct lu_env      *env;
2630         struct req_capsule       *pill;
2631         int                       rc;
2632         ENTRY;
2633
2634         env = info->mti_env;
2635         pill = info->mti_pill;
2636
2637         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2638         if (body == NULL)
2639                 RETURN(-EFAULT);
2640
2641         if (!(body->mbo_valid & OBD_MD_FLID))
2642                 RETURN(0);
2643
2644         if (!fid_is_sane(&body->mbo_fid1)) {
2645                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2646                 RETURN(-EINVAL);
2647         }
2648
2649         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
2650         if (!IS_ERR(obj)) {
2651                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
2652                         mdt_object_put(env, obj);
2653                         rc = -ENOENT;
2654                 } else {
2655                         info->mti_object = obj;
2656                         rc = 0;
2657                 }
2658         } else
2659                 rc = PTR_ERR(obj);
2660
2661         RETURN(rc);
2662 }
2663
2664 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2665 {
2666         struct req_capsule *pill = info->mti_pill;
2667         int rc;
2668         ENTRY;
2669
2670         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2671                 rc = mdt_body_unpack(info, flags);
2672         else
2673                 rc = 0;
2674
2675         if (rc == 0 && (flags & HABEO_REFERO)) {
2676                 /* Pack reply. */
2677                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2678                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2679                                              DEF_REP_MD_SIZE);
2680                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2681                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2682                                              RCL_SERVER, 0);
2683
2684                 rc = req_capsule_server_pack(pill);
2685         }
2686         RETURN(rc);
2687 }
2688
2689 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2690 {
2691         lh->mlh_type = MDT_NUL_LOCK;
2692         lh->mlh_reg_lh.cookie = 0ull;
2693         lh->mlh_reg_mode = LCK_MINMODE;
2694         lh->mlh_pdo_lh.cookie = 0ull;
2695         lh->mlh_pdo_mode = LCK_MINMODE;
2696         lh->mlh_rreg_lh.cookie = 0ull;
2697         lh->mlh_rreg_mode = LCK_MINMODE;
2698 }
2699
2700 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2701 {
2702         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2703         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2704 }
2705
2706 /*
2707  * Initialize fields of struct mdt_thread_info. Other fields are left in
2708  * uninitialized state, because it's too expensive to zero out whole
2709  * mdt_thread_info (> 1K) on each request arrival.
2710  */
2711 void mdt_thread_info_init(struct ptlrpc_request *req,
2712                           struct mdt_thread_info *info)
2713 {
2714         int i;
2715
2716         info->mti_pill = &req->rq_pill;
2717
2718         /* lock handle */
2719         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2720                 mdt_lock_handle_init(&info->mti_lh[i]);
2721
2722         /* mdt device: it can be NULL while CONNECT */
2723         if (req->rq_export) {
2724                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2725                 info->mti_exp = req->rq_export;
2726         } else
2727                 info->mti_mdt = NULL;
2728         info->mti_env = req->rq_svc_thread->t_env;
2729         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2730
2731         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2732         info->mti_big_buf = LU_BUF_NULL;
2733         info->mti_body = NULL;
2734         info->mti_object = NULL;
2735         info->mti_dlm_req = NULL;
2736         info->mti_has_trans = 0;
2737         info->mti_cross_ref = 0;
2738         info->mti_opdata = 0;
2739         info->mti_big_lmm_used = 0;
2740
2741         info->mti_spec.no_create = 0;
2742         info->mti_spec.sp_rm_entry = 0;
2743         info->mti_spec.sp_permitted = 0;
2744         info->mti_spec.sp_migrate_close = 0;
2745
2746         info->mti_spec.u.sp_ea.eadata = NULL;
2747         info->mti_spec.u.sp_ea.eadatalen = 0;
2748 }
2749
2750 void mdt_thread_info_fini(struct mdt_thread_info *info)
2751 {
2752         int i;
2753
2754         if (info->mti_object != NULL) {
2755                 mdt_object_put(info->mti_env, info->mti_object);
2756                 info->mti_object = NULL;
2757         }
2758
2759         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2760                 mdt_lock_handle_fini(&info->mti_lh[i]);
2761         info->mti_env = NULL;
2762         info->mti_pill = NULL;
2763         info->mti_exp = NULL;
2764
2765         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2766                 lu_buf_free(&info->mti_big_buf);
2767 }
2768
2769 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2770 {
2771         struct mdt_thread_info  *mti;
2772
2773         mti = mdt_th_info(tsi->tsi_env);
2774         LASSERT(mti != NULL);
2775
2776         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2777         if (tsi->tsi_corpus != NULL) {
2778                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2779                 lu_object_get(tsi->tsi_corpus);
2780         }
2781         mti->mti_body = tsi->tsi_mdt_body;
2782         mti->mti_dlm_req = tsi->tsi_dlm_req;
2783
2784         return mti;
2785 }
2786
2787 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2788 {
2789         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2790         int                      rc;
2791
2792         ENTRY;
2793
2794         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
2795             cfs_fail_val ==
2796             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
2797                 set_current_state(TASK_UNINTERRUPTIBLE);
2798                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
2799         }
2800
2801         rc = tgt_connect(tsi);
2802         if (rc != 0)
2803                 RETURN(rc);
2804
2805         rc = mdt_init_idmap(tsi);
2806         if (rc != 0)
2807                 GOTO(err, rc);
2808         RETURN(0);
2809 err:
2810         obd_disconnect(class_export_get(req->rq_export));
2811         return rc;
2812 }
2813
2814 enum mdt_it_code {
2815         MDT_IT_OPEN,
2816         MDT_IT_OCREAT,
2817         MDT_IT_CREATE,
2818         MDT_IT_GETATTR,
2819         MDT_IT_READDIR,
2820         MDT_IT_LOOKUP,
2821         MDT_IT_UNLINK,
2822         MDT_IT_TRUNC,
2823         MDT_IT_GETXATTR,
2824         MDT_IT_LAYOUT,
2825         MDT_IT_QUOTA,
2826         MDT_IT_NR
2827 };
2828
2829 static int mdt_intent_getattr(enum mdt_it_code opcode,
2830                               struct mdt_thread_info *info,
2831                               struct ldlm_lock **,
2832                               __u64);
2833
2834 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2835                                 struct mdt_thread_info *info,
2836                                 struct ldlm_lock **lockp,
2837                                 __u64 flags);
2838
2839 static int mdt_intent_layout(enum mdt_it_code opcode,
2840                              struct mdt_thread_info *info,
2841                              struct ldlm_lock **,
2842                              __u64);
2843 static int mdt_intent_reint(enum mdt_it_code opcode,
2844                             struct mdt_thread_info *info,
2845                             struct ldlm_lock **,
2846                             __u64);
2847
2848 static struct mdt_it_flavor {
2849         const struct req_format *it_fmt;
2850         __u32                    it_flags;
2851         int                    (*it_act)(enum mdt_it_code ,
2852                                          struct mdt_thread_info *,
2853                                          struct ldlm_lock **,
2854                                          __u64);
2855         long                     it_reint;
2856 } mdt_it_flavor[] = {
2857         [MDT_IT_OPEN]     = {
2858                 .it_fmt   = &RQF_LDLM_INTENT,
2859                 /*.it_flags = HABEO_REFERO,*/
2860                 .it_flags = 0,
2861                 .it_act   = mdt_intent_reint,
2862                 .it_reint = REINT_OPEN
2863         },
2864         [MDT_IT_OCREAT]   = {
2865                 .it_fmt   = &RQF_LDLM_INTENT,
2866                 /*
2867                  * OCREAT is not a MUTABOR request as if the file
2868                  * already exists.
2869                  * We do the extra check of OBD_CONNECT_RDONLY in
2870                  * mdt_reint_open() when we really need to create
2871                  * the object.
2872                  */
2873                 .it_flags = 0,
2874                 .it_act   = mdt_intent_reint,
2875                 .it_reint = REINT_OPEN
2876         },
2877         [MDT_IT_CREATE]   = {
2878                 .it_fmt   = &RQF_LDLM_INTENT,
2879                 .it_flags = MUTABOR,
2880                 .it_act   = mdt_intent_reint,
2881                 .it_reint = REINT_CREATE
2882         },
2883         [MDT_IT_GETATTR]  = {
2884                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2885                 .it_flags = HABEO_REFERO,
2886                 .it_act   = mdt_intent_getattr
2887         },
2888         [MDT_IT_READDIR]  = {
2889                 .it_fmt   = NULL,
2890                 .it_flags = 0,
2891                 .it_act   = NULL
2892         },
2893         [MDT_IT_LOOKUP]   = {
2894                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2895                 .it_flags = HABEO_REFERO,
2896                 .it_act   = mdt_intent_getattr
2897         },
2898         [MDT_IT_UNLINK]   = {
2899                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2900                 .it_flags = MUTABOR,
2901                 .it_act   = NULL,
2902                 .it_reint = REINT_UNLINK
2903         },
2904         [MDT_IT_TRUNC]    = {
2905                 .it_fmt   = NULL,
2906                 .it_flags = MUTABOR,
2907                 .it_act   = NULL
2908         },
2909         [MDT_IT_GETXATTR] = {
2910                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2911                 .it_flags = HABEO_CORPUS,
2912                 .it_act   = mdt_intent_getxattr
2913         },
2914         [MDT_IT_LAYOUT] = {
2915                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2916                 .it_flags = 0,
2917                 .it_act   = mdt_intent_layout
2918         }
2919 };
2920
2921 static int
2922 mdt_intent_lock_replace(struct mdt_thread_info *info,
2923                         struct ldlm_lock **lockp,
2924                         struct mdt_lock_handle *lh,
2925                         __u64 flags)
2926 {
2927         struct ptlrpc_request  *req = mdt_info_req(info);
2928         struct ldlm_lock       *lock = *lockp;
2929         struct ldlm_lock       *new_lock;
2930
2931         /* If possible resent found a lock, @lh is set to its handle */
2932         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2933
2934         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2935                 lh->mlh_reg_lh.cookie = 0;
2936                 RETURN(0);
2937         }
2938
2939         LASSERTF(new_lock != NULL,
2940                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2941
2942         /*
2943          * If we've already given this lock to a client once, then we should
2944          * have no readers or writers.  Otherwise, we should have one reader
2945          * _or_ writer ref (which will be zeroed below) before returning the
2946          * lock to a client.
2947          */
2948         if (new_lock->l_export == req->rq_export) {
2949                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2950         } else {
2951                 LASSERT(new_lock->l_export == NULL);
2952                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2953         }
2954
2955         *lockp = new_lock;
2956
2957         if (new_lock->l_export == req->rq_export) {
2958                 /*
2959                  * Already gave this to the client, which means that we
2960                  * reconstructed a reply.
2961                  */
2962                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2963                         MSG_RESENT);
2964
2965                 LDLM_LOCK_RELEASE(new_lock);
2966                 lh->mlh_reg_lh.cookie = 0;
2967                 RETURN(ELDLM_LOCK_REPLACED);
2968         }
2969
2970         /*
2971          * Fixup the lock to be given to the client.
2972          */
2973         lock_res_and_lock(new_lock);
2974         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
2975          * possible blocking AST. */
2976         while (new_lock->l_readers > 0) {
2977                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
2978                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2979                 new_lock->l_readers--;
2980         }
2981         while (new_lock->l_writers > 0) {
2982                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
2983                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2984                 new_lock->l_writers--;
2985         }
2986
2987         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
2988         new_lock->l_blocking_ast = lock->l_blocking_ast;
2989         new_lock->l_completion_ast = lock->l_completion_ast;
2990         new_lock->l_remote_handle = lock->l_remote_handle;
2991         new_lock->l_flags &= ~LDLM_FL_LOCAL;
2992
2993         unlock_res_and_lock(new_lock);
2994
2995         cfs_hash_add(new_lock->l_export->exp_lock_hash,
2996                      &new_lock->l_remote_handle,
2997                      &new_lock->l_exp_hash);
2998
2999         LDLM_LOCK_RELEASE(new_lock);
3000         lh->mlh_reg_lh.cookie = 0;
3001
3002         RETURN(ELDLM_LOCK_REPLACED);
3003 }
3004
3005 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3006                                     struct ldlm_lock *new_lock,
3007                                     struct mdt_lock_handle *lh,
3008                                     __u64 flags)
3009 {
3010         struct ptlrpc_request  *req = mdt_info_req(info);
3011         struct ldlm_request    *dlmreq;
3012
3013         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3014                 return;
3015
3016         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3017
3018         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3019          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3020          * initialized. */
3021         if (flags & LDLM_FL_RESENT) {
3022                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3023                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3024
3025                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3026                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie "LPX64,
3027                           lh->mlh_reg_lh.cookie);
3028                 return;
3029         }
3030
3031         /*
3032          * If the xid matches, then we know this is a resent request, and allow
3033          * it. (It's probably an OPEN, for which we don't send a lock.
3034          */
3035         if (req_can_reconstruct(req, NULL))
3036                 return;
3037
3038         /*
3039          * This remote handle isn't enqueued, so we never received or processed
3040          * this request.  Clear MSG_RESENT, because it can be handled like any
3041          * normal request now.
3042          */
3043         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3044
3045         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3046                   dlmreq->lock_handle[0].cookie);
3047 }
3048
3049 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3050                                 struct mdt_thread_info *info,
3051                                 struct ldlm_lock **lockp,
3052                                 __u64 flags)
3053 {
3054         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3055         struct ldlm_reply      *ldlm_rep = NULL;
3056         int rc, grc;
3057
3058         /*
3059          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3060          * (for the resend case) or a new lock. Below we will use it to
3061          * replace the original lock.
3062          */
3063         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3064         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3065                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3066                 rc = mdt_object_lock(info, info->mti_object, lhc,
3067                                      MDS_INODELOCK_XATTR);
3068                 if (rc)
3069                         return rc;
3070         }
3071
3072         grc = mdt_getxattr(info);
3073
3074         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3075
3076         if (mdt_info_req(info)->rq_repmsg != NULL)
3077                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3078         if (ldlm_rep == NULL)
3079                 RETURN(err_serious(-EFAULT));
3080
3081         ldlm_rep->lock_policy_res2 = grc;
3082
3083         return rc;
3084 }
3085
3086 static int mdt_intent_getattr(enum mdt_it_code opcode,
3087                               struct mdt_thread_info *info,
3088                               struct ldlm_lock **lockp,
3089                               __u64 flags)
3090 {
3091         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3092         __u64                   child_bits;
3093         struct ldlm_reply      *ldlm_rep;
3094         struct mdt_body        *reqbody;
3095         struct mdt_body        *repbody;
3096         int                     rc, rc2;
3097         ENTRY;
3098
3099         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3100         LASSERT(reqbody);
3101
3102         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3103         LASSERT(repbody);
3104
3105         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3106         repbody->mbo_eadatasize = 0;
3107         repbody->mbo_aclsize = 0;
3108
3109         switch (opcode) {
3110         case MDT_IT_LOOKUP:
3111                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3112                 break;
3113         case MDT_IT_GETATTR:
3114                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3115                              MDS_INODELOCK_PERM;
3116                 break;
3117         default:
3118                 CERROR("Unsupported intent (%d)\n", opcode);
3119                 GOTO(out_shrink, rc = -EINVAL);
3120         }
3121
3122         rc = mdt_init_ucred_intent_getattr(info, reqbody);
3123         if (rc)
3124                 GOTO(out_shrink, rc);
3125
3126         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3127         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3128
3129         /* Get lock from request for possible resent case. */
3130         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3131
3132         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3133         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3134
3135         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3136                 ldlm_rep->lock_policy_res2 = 0;
3137         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3138             ldlm_rep->lock_policy_res2) {
3139                 lhc->mlh_reg_lh.cookie = 0ull;
3140                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3141         }
3142
3143         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3144         EXIT;
3145 out_ucred:
3146         mdt_exit_ucred(info);
3147 out_shrink:
3148         mdt_client_compatibility(info);
3149         rc2 = mdt_fix_reply(info);
3150         if (rc == 0)
3151                 rc = rc2;
3152         return rc;
3153 }
3154
3155 static int mdt_intent_layout(enum mdt_it_code opcode,
3156                              struct mdt_thread_info *info,
3157                              struct ldlm_lock **lockp,
3158                              __u64 flags)
3159 {
3160         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3161         struct layout_intent *layout;
3162         struct lu_fid *fid;
3163         struct mdt_object *obj = NULL;
3164         int rc = 0;
3165         ENTRY;
3166
3167         if (opcode != MDT_IT_LAYOUT) {
3168                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3169                         opcode);
3170                 RETURN(-EINVAL);
3171         }
3172
3173         fid = &info->mti_tmp_fid2;
3174         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3175
3176         /* Get lock from request for possible resent case. */
3177         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3178
3179         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3180         if (IS_ERR(obj))
3181                 RETURN(PTR_ERR(obj));
3182
3183         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3184                 /* get the length of lsm */
3185                 rc = mdt_attr_get_eabuf_size(info, obj);
3186                 if (rc < 0) {
3187                         mdt_object_put(info->mti_env, obj);
3188                         RETURN(rc);
3189                 }
3190
3191                 if (rc > info->mti_mdt->mdt_max_mdsize)
3192                         info->mti_mdt->mdt_max_mdsize = rc;
3193         }
3194
3195         mdt_object_put(info->mti_env, obj);
3196
3197         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3198         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER, rc);
3199         rc = req_capsule_server_pack(info->mti_pill);
3200         if (rc != 0)
3201                 RETURN(-EINVAL);
3202
3203         if (lustre_handle_is_used(&lhc->mlh_reg_lh))
3204                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3205
3206         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3207         LASSERT(layout != NULL);
3208         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3209                 /* return to normal/resent ldlm handling */
3210                 RETURN(rc);
3211
3212         CERROR("%s: Unsupported layout intent (%d)\n",
3213                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3214         RETURN(-EINVAL);
3215 }
3216
3217 static int mdt_intent_reint(enum mdt_it_code opcode,
3218                             struct mdt_thread_info *info,
3219                             struct ldlm_lock **lockp,
3220                             __u64 flags)
3221 {
3222         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3223         struct ldlm_reply      *rep = NULL;
3224         long                    opc;
3225         int                     rc;
3226
3227         static const struct req_format *intent_fmts[REINT_MAX] = {
3228                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3229                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3230         };
3231
3232         ENTRY;
3233
3234         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3235         if (opc < 0)
3236                 RETURN(opc);
3237
3238         if (mdt_it_flavor[opcode].it_reint != opc) {
3239                 CERROR("Reint code %ld doesn't match intent: %d\n",
3240                        opc, opcode);
3241                 RETURN(err_serious(-EPROTO));
3242         }
3243
3244         /* Get lock from request for possible resent case. */
3245         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3246
3247         rc = mdt_reint_internal(info, lhc, opc);
3248
3249         /* Check whether the reply has been packed successfully. */
3250         if (mdt_info_req(info)->rq_repmsg != NULL)
3251                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3252         if (rep == NULL)
3253                 RETURN(err_serious(-EFAULT));
3254
3255         /* MDC expects this in any case */
3256         if (rc != 0)
3257                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3258
3259         /* the open lock or the lock for cross-ref object should be
3260          * returned to the client */
3261         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3262             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3263                 rep->lock_policy_res2 = 0;
3264                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3265                 RETURN(rc);
3266         }
3267
3268         rep->lock_policy_res2 = clear_serious(rc);
3269
3270         if (rep->lock_policy_res2 == -ENOENT &&
3271             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3272                 rep->lock_policy_res2 = 0;
3273
3274         lhc->mlh_reg_lh.cookie = 0ull;
3275         if (rc == -ENOTCONN || rc == -ENODEV ||
3276             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3277                 /*
3278                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3279                  * will be returned by rq_status, and client at ptlrpc layer
3280                  * will detect this, then disconnect, reconnect the import
3281                  * immediately, instead of impacting the following the rpc.
3282                  */
3283                 RETURN(rc);
3284         }
3285         /*
3286          * For other cases, the error will be returned by intent, and client
3287          * will retrieve the result from intent.
3288          */
3289         RETURN(ELDLM_LOCK_ABORTED);
3290 }
3291
3292 static int mdt_intent_code(long itcode)
3293 {
3294         int rc;
3295
3296         switch(itcode) {
3297         case IT_OPEN:
3298                 rc = MDT_IT_OPEN;
3299                 break;
3300         case IT_OPEN|IT_CREAT:
3301                 rc = MDT_IT_OCREAT;
3302                 break;
3303         case IT_CREAT:
3304                 rc = MDT_IT_CREATE;
3305                 break;
3306         case IT_READDIR:
3307                 rc = MDT_IT_READDIR;
3308                 break;
3309         case IT_GETATTR:
3310                 rc = MDT_IT_GETATTR;
3311                 break;
3312         case IT_LOOKUP:
3313                 rc = MDT_IT_LOOKUP;
3314                 break;
3315         case IT_UNLINK:
3316                 rc = MDT_IT_UNLINK;
3317                 break;
3318         case IT_TRUNC:
3319                 rc = MDT_IT_TRUNC;
3320                 break;
3321         case IT_GETXATTR:
3322                 rc = MDT_IT_GETXATTR;
3323                 break;
3324         case IT_LAYOUT:
3325                 rc = MDT_IT_LAYOUT;
3326                 break;
3327         case IT_QUOTA_DQACQ:
3328         case IT_QUOTA_CONN:
3329                 rc = MDT_IT_QUOTA;
3330                 break;
3331         default:
3332                 CERROR("Unknown intent opcode: %ld\n", itcode);
3333                 rc = -EINVAL;
3334                 break;
3335         }
3336         return rc;
3337 }
3338
3339 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3340                           struct ldlm_lock **lockp, __u64 flags)
3341 {
3342         struct req_capsule      *pill = info->mti_pill;
3343         struct ptlrpc_request   *req = mdt_info_req(info);
3344         struct mdt_it_flavor    *flv;
3345         int opc;
3346         int rc;
3347         ENTRY;
3348
3349         opc = mdt_intent_code(itopc);
3350         if (opc < 0)
3351                 RETURN(-EINVAL);
3352
3353         if (opc == MDT_IT_QUOTA) {
3354                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3355
3356                 if (qmt == NULL)
3357                         RETURN(-EOPNOTSUPP);
3358
3359                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3360                 /* pass the request to quota master */
3361                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3362                                                  mdt_info_req(info), lockp,
3363                                                  flags);
3364                 RETURN(rc);
3365         }
3366
3367         flv = &mdt_it_flavor[opc];
3368         if (flv->it_fmt != NULL)
3369                 req_capsule_extend(pill, flv->it_fmt);
3370
3371         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3372         if (rc < 0)
3373                 RETURN(rc);
3374
3375         if (flv->it_flags & MUTABOR &&
3376             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3377                 RETURN(-EROFS);
3378
3379         if (flv->it_act != NULL) {
3380                 struct ldlm_reply *rep;
3381
3382                 /* execute policy */
3383                 rc = flv->it_act(opc, info, lockp, flags);
3384
3385                 /* Check whether the reply has been packed successfully. */
3386                 if (req->rq_repmsg != NULL) {
3387                         rep = req_capsule_server_get(info->mti_pill,
3388                                                      &RMF_DLM_REP);
3389                         rep->lock_policy_res2 =
3390                                 ptlrpc_status_hton(rep->lock_policy_res2);
3391                 }
3392         }
3393
3394         RETURN(rc);
3395 }
3396
3397 static int mdt_intent_policy(struct ldlm_namespace *ns,
3398                              struct ldlm_lock **lockp, void *req_cookie,
3399                              ldlm_mode_t mode, __u64 flags, void *data)
3400 {
3401         struct tgt_session_info *tsi;
3402         struct mdt_thread_info  *info;
3403         struct ptlrpc_request   *req  =  req_cookie;
3404         struct ldlm_intent      *it;
3405         struct req_capsule      *pill;
3406         int rc;
3407
3408         ENTRY;
3409
3410         LASSERT(req != NULL);
3411
3412         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3413
3414         info = tsi2mdt_info(tsi);
3415         LASSERT(info != NULL);
3416         pill = info->mti_pill;
3417         LASSERT(pill->rc_req == req);
3418
3419         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3420                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3421                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3422                 if (it != NULL) {
3423                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3424                         if (rc == 0)
3425                                 rc = ELDLM_OK;
3426
3427                         /* Lock without inodebits makes no sense and will oops
3428                          * later in ldlm. Let's check it now to see if we have
3429                          * ibits corrupted somewhere in mdt_intent_opc().
3430                          * The case for client miss to set ibits has been
3431                          * processed by others. */
3432                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3433                                         lr_type == LDLM_IBITS,
3434                                      info->mti_dlm_req->lock_desc.\
3435                                         l_policy_data.l_inodebits.bits != 0));
3436                 } else
3437                         rc = err_serious(-EFAULT);
3438         } else {
3439                 /* No intent was provided */
3440                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3441                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3442                 rc = req_capsule_server_pack(pill);
3443                 if (rc)
3444                         rc = err_serious(rc);
3445         }
3446         mdt_thread_info_fini(info);
3447         RETURN(rc);
3448 }
3449
3450 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3451 {
3452         struct seq_server_site  *ss = mdt_seq_site(mdt);
3453
3454         if (ss->ss_node_id == 0)
3455                 return;
3456
3457         if (ss->ss_client_seq != NULL) {
3458                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3459                 ss->ss_client_seq->lcs_exp = NULL;
3460         }
3461
3462         if (ss->ss_server_fld != NULL) {
3463                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3464                 ss->ss_server_fld->lsf_control_exp = NULL;
3465         }
3466 }
3467
3468 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3469 {
3470         struct seq_server_site *ss = mdt_seq_site(mdt);
3471
3472         if (ss == NULL)
3473                 return;
3474
3475         if (ss->ss_server_seq != NULL)
3476                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3477 }
3478
3479 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3480 {
3481         mdt_seq_fini_cli(mdt);
3482         mdt_deregister_seq_exp(mdt);
3483
3484         return seq_site_fini(env, mdt_seq_site(mdt));
3485 }
3486
3487 /**
3488  * It will retrieve its FLDB entries from MDT0, and it only happens
3489  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3490  * and it needs to refresh FLDB from the MDT0.
3491  **/
3492 static int mdt_register_lwp_callback(void *data)
3493 {
3494         struct lu_env           env;
3495         struct mdt_device       *mdt = data;
3496         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3497         int                     rc;
3498         ENTRY;
3499
3500         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3501
3502         rc = lu_env_init(&env, LCT_MD_THREAD);
3503         if (rc < 0) {
3504                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3505                 RETURN(rc);
3506         }
3507
3508         /* Allocate new sequence now to avoid creating local transaction
3509          * in the normal transaction process */
3510         rc = seq_server_check_and_alloc_super(&env,
3511                                               mdt_seq_site(mdt)->ss_server_seq);
3512         if (rc < 0)
3513                 GOTO(out, rc);
3514
3515         if (fld->lsf_new) {
3516                 rc = fld_update_from_controller(&env, fld);
3517                 if (rc != 0) {
3518                         CERROR("%s: cannot update controller: rc = %d\n",
3519                                mdt_obd_name(mdt), rc);
3520                         GOTO(out, rc);
3521                 }
3522         }
3523 out:
3524         lu_env_fini(&env);
3525         RETURN(rc);
3526 }
3527
3528 static int mdt_register_seq_exp(struct mdt_device *mdt)
3529 {
3530         struct seq_server_site  *ss = mdt_seq_site(mdt);
3531         char                    *lwp_name = NULL;
3532         int                     rc;
3533
3534         if (ss->ss_node_id == 0)
3535                 return 0;
3536
3537         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3538         if (lwp_name == NULL)
3539                 GOTO(out_free, rc = -ENOMEM);
3540
3541         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3542         if (rc != 0)
3543                 GOTO(out_free, rc);
3544
3545         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3546                                       NULL, NULL);
3547         if (rc != 0)
3548                 GOTO(out_free, rc);
3549
3550         rc = lustre_register_lwp_item(lwp_name,
3551                                       &ss->ss_server_fld->lsf_control_exp,
3552                                       mdt_register_lwp_callback, mdt);
3553         if (rc != 0) {
3554                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3555                 ss->ss_client_seq->lcs_exp = NULL;
3556                 GOTO(out_free, rc);
3557         }
3558 out_free:
3559         if (lwp_name != NULL)
3560                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3561
3562         return rc;
3563 }
3564
3565 /*
3566  * Init client sequence manager which is used by local MDS to talk to sequence
3567  * controller on remote node.
3568  */
3569 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3570 {
3571         struct seq_server_site  *ss = mdt_seq_site(mdt);
3572         int                     rc;
3573         char                    *prefix;
3574         ENTRY;
3575
3576         /* check if this is adding the first MDC and controller is not yet
3577          * initialized. */
3578         OBD_ALLOC_PTR(ss->ss_client_seq);
3579         if (ss->ss_client_seq == NULL)
3580                 RETURN(-ENOMEM);
3581
3582         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3583         if (prefix == NULL) {
3584                 OBD_FREE_PTR(ss->ss_client_seq);
3585                 ss->ss_client_seq = NULL;
3586                 RETURN(-ENOMEM);
3587         }
3588
3589         /* Note: seq_client_fini will be called in seq_site_fini */
3590         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3591         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3592                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3593                                                             NULL);
3594         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3595         if (rc != 0) {
3596                 OBD_FREE_PTR(ss->ss_client_seq);
3597                 ss->ss_client_seq = NULL;
3598                 RETURN(rc);
3599         }
3600
3601         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3602
3603         RETURN(rc);
3604 }
3605
3606 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3607 {
3608         struct seq_server_site  *ss;
3609         int                     rc;
3610         ENTRY;
3611
3612         ss = mdt_seq_site(mdt);
3613         /* init sequence controller server(MDT0) */
3614         if (ss->ss_node_id == 0) {
3615                 OBD_ALLOC_PTR(ss->ss_control_seq);
3616                 if (ss->ss_control_seq == NULL)
3617                         RETURN(-ENOMEM);
3618
3619                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3620                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3621                                      ss);
3622                 if (rc)
3623                         GOTO(out_seq_fini, rc);
3624         }
3625
3626         /* Init normal sequence server */
3627         OBD_ALLOC_PTR(ss->ss_server_seq);
3628         if (ss->ss_server_seq == NULL)
3629                 GOTO(out_seq_fini, rc = -ENOMEM);
3630
3631         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3632                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3633         if (rc)
3634                 GOTO(out_seq_fini, rc);
3635
3636         /* init seq client for seq server to talk to seq controller(MDT0) */
3637         rc = mdt_seq_init_cli(env, mdt);
3638         if (rc != 0)
3639                 GOTO(out_seq_fini, rc);
3640
3641         if (ss->ss_node_id != 0)
3642                 /* register controller export through lwp */
3643                 rc = mdt_register_seq_exp(mdt);
3644
3645         EXIT;
3646 out_seq_fini:
3647         if (rc)
3648                 mdt_seq_fini(env, mdt);
3649
3650         return rc;
3651 }
3652
3653 /*
3654  * FLD wrappers
3655  */
3656 static int mdt_fld_fini(const struct lu_env *env,
3657                         struct mdt_device *m)
3658 {
3659         struct seq_server_site *ss = mdt_seq_site(m);
3660         ENTRY;
3661
3662         if (ss && ss->ss_server_fld) {
3663                 fld_server_fini(env, ss->ss_server_fld);
3664                 OBD_FREE_PTR(ss->ss_server_fld);
3665                 ss->ss_server_fld = NULL;
3666         }
3667
3668         RETURN(0);
3669 }
3670
3671 static int mdt_fld_init(const struct lu_env *env,
3672                         const char *uuid,
3673                         struct mdt_device *m)
3674 {
3675         struct seq_server_site *ss;
3676         int rc;
3677         ENTRY;
3678
3679         ss = mdt_seq_site(m);
3680
3681         OBD_ALLOC_PTR(ss->ss_server_fld);
3682         if (ss->ss_server_fld == NULL)
3683                 RETURN(rc = -ENOMEM);
3684
3685         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3686                              LU_SEQ_RANGE_MDT);
3687         if (rc) {
3688                 OBD_FREE_PTR(ss->ss_server_fld);
3689                 ss->ss_server_fld = NULL;
3690                 RETURN(rc);
3691         }
3692
3693         RETURN(0);
3694 }
3695
3696 static void mdt_stack_pre_fini(const struct lu_env *env,
3697                            struct mdt_device *m, struct lu_device *top)
3698 {
3699         struct lustre_cfg_bufs  *bufs;
3700         struct lustre_cfg       *lcfg;
3701         struct mdt_thread_info  *info;
3702         ENTRY;
3703
3704         LASSERT(top);
3705
3706         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3707         LASSERT(info != NULL);
3708
3709         bufs = &info->mti_u.bufs;
3710
3711         LASSERT(m->mdt_child_exp);
3712         LASSERT(m->mdt_child_exp->exp_obd);
3713
3714         /* process cleanup, pass mdt obd name to get obd umount flags */
3715         /* XXX: this is needed because all layers are referenced by
3716          * objects (some of them are pinned by osd, for example *
3717          * the proper solution should be a model where object used
3718          * by osd only doesn't have mdt/mdd slices -bzzz */
3719         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3720         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3721         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3722         if (lcfg == NULL)
3723                 RETURN_EXIT;
3724
3725         top->ld_ops->ldo_process_config(env, top, lcfg);
3726         lustre_cfg_free(lcfg);
3727         EXIT;
3728 }
3729
3730 static void mdt_stack_fini(const struct lu_env *env,
3731                            struct mdt_device *m, struct lu_device *top)
3732 {
3733         struct obd_device       *obd = mdt2obd_dev(m);
3734         struct lustre_cfg_bufs  *bufs;
3735         struct lustre_cfg       *lcfg;
3736         struct mdt_thread_info  *info;
3737         char                     flags[3] = "";
3738         ENTRY;
3739
3740         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3741         LASSERT(info != NULL);
3742
3743         lu_dev_del_linkage(top->ld_site, top);
3744
3745         lu_site_purge(env, top->ld_site, -1);
3746
3747         bufs = &info->mti_u.bufs;
3748         /* process cleanup, pass mdt obd name to get obd umount flags */
3749         /* another purpose is to let all layers to release their objects */
3750         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3751         if (obd->obd_force)
3752                 strcat(flags, "F");
3753         if (obd->obd_fail)
3754                 strcat(flags, "A");
3755         lustre_cfg_bufs_set_string(bufs, 1, flags);
3756         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3757         if (lcfg == NULL)
3758                 RETURN_EXIT;
3759
3760         LASSERT(top);
3761         top->ld_ops->ldo_process_config(env, top, lcfg);
3762         lustre_cfg_free(lcfg);
3763
3764         lu_site_purge(env, top->ld_site, -1);
3765
3766         m->mdt_child = NULL;
3767         m->mdt_bottom = NULL;
3768
3769         obd_disconnect(m->mdt_child_exp);
3770         m->mdt_child_exp = NULL;
3771
3772         obd_disconnect(m->mdt_bottom_exp);
3773         m->mdt_child_exp = NULL;
3774 }
3775
3776 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3777                                const char *next, struct obd_export **exp)
3778 {
3779         struct obd_connect_data *data = NULL;
3780         struct obd_device       *obd;
3781         int                      rc;
3782         ENTRY;
3783
3784         OBD_ALLOC_PTR(data);
3785         if (data == NULL)
3786                 GOTO(out, rc = -ENOMEM);
3787
3788         obd = class_name2obd(next);
3789         if (obd == NULL) {
3790                 CERROR("%s: can't locate next device: %s\n",
3791                        mdt_obd_name(m), next);
3792                 GOTO(out, rc = -ENOTCONN);
3793         }
3794
3795         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3796         data->ocd_version = LUSTRE_VERSION_CODE;
3797
3798         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3799         if (rc) {
3800                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3801                        mdt_obd_name(m), next, rc);
3802                 GOTO(out, rc);
3803         }
3804
3805 out:
3806         if (data)
3807                 OBD_FREE_PTR(data);
3808         RETURN(rc);
3809 }
3810
3811 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3812                           struct lustre_cfg *cfg)
3813 {
3814         char                   *dev = lustre_cfg_string(cfg, 0);
3815         int                     rc, name_size, uuid_size;
3816         char                   *name, *uuid, *p;
3817         struct lustre_cfg_bufs *bufs;
3818         struct lustre_cfg      *lcfg;
3819         struct obd_device      *obd;
3820         struct lustre_profile  *lprof;
3821         struct lu_site         *site;
3822         ENTRY;
3823
3824         /* in 1.8 we had the only device in the stack - MDS.
3825          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3826          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3827          * to generate names and setup MDT, MDD. MDT will be using
3828          * generated name to connect to MDD. for MDD the next device
3829          * will be LOD with name taken from so called "profile" which
3830          * is generated by mount_option line
3831          *
3832          * 1.8 MGS generates config. commands like this:
3833          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3834          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3835          * 2.0 MGS generates config. commands like this:
3836          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3837          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3838          *                    3:lustre-MDT0000-mdtlov  4:f
3839          *
3840          * we generate MDD name from MDT one, just replacing T with D
3841          *
3842          * after all the preparations, the logical equivalent will be
3843          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3844          *                    3:lustre-MDT0000-mdtlov  4:f
3845          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3846          *                    3:lustre-MDD0000  4:f
3847          *
3848          *  notice we build the stack from down to top: MDD first, then MDT */
3849
3850         name_size = MAX_OBD_NAME;
3851         uuid_size = MAX_OBD_NAME;
3852
3853         OBD_ALLOC(name, name_size);
3854         OBD_ALLOC(uuid, uuid_size);
3855         if (name == NULL || uuid == NULL)
3856                 GOTO(cleanup_mem, rc = -ENOMEM);
3857
3858         OBD_ALLOC_PTR(bufs);
3859         if (!bufs)
3860                 GOTO(cleanup_mem, rc = -ENOMEM);
3861
3862         strcpy(name, dev);
3863         p = strstr(name, "-MDT");
3864         if (p == NULL)
3865                 GOTO(free_bufs, rc = -ENOMEM);
3866         p[3] = 'D';
3867
3868         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3869
3870         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3871         if (lprof == NULL || lprof->lp_dt == NULL) {
3872                 CERROR("can't find the profile: %s\n",
3873                        lustre_cfg_string(cfg, 0));
3874                 GOTO(free_bufs, rc = -EINVAL);
3875         }
3876
3877         lustre_cfg_bufs_reset(bufs, name);
3878         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
3879         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3880         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3881
3882         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3883         if (lcfg == NULL)
3884                 GOTO(free_bufs, rc = -ENOMEM);
3885
3886         rc = class_attach(lcfg);
3887         if (rc)
3888                 GOTO(lcfg_cleanup, rc);
3889
3890         obd = class_name2obd(name);
3891         if (!obd) {
3892                 CERROR("Can not find obd %s (%s in config)\n",
3893                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
3894                 GOTO(lcfg_cleanup, rc = -EINVAL);
3895         }
3896
3897         lustre_cfg_free(lcfg);
3898
3899         lustre_cfg_bufs_reset(bufs, name);
3900         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3901         lustre_cfg_bufs_set_string(bufs, 2, dev);
3902         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3903
3904         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3905         if (lcfg == NULL)
3906                 GOTO(class_detach, rc = -ENOMEM);
3907
3908         rc = class_setup(obd, lcfg);
3909         if (rc)
3910                 GOTO(class_detach, rc);
3911
3912         /* connect to MDD we just setup */
3913         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
3914         if (rc)
3915                 GOTO(class_detach, rc);
3916
3917         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
3918         LASSERT(site);
3919         LASSERT(mdt_lu_site(mdt) == NULL);
3920         mdt->mdt_lu_dev.ld_site = site;
3921         site->ls_top_dev = &mdt->mdt_lu_dev;
3922         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
3923
3924         /* now connect to bottom OSD */
3925         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
3926         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
3927         if (rc)
3928                 GOTO(class_detach, rc);
3929         mdt->mdt_bottom =
3930                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
3931
3932         rc = lu_env_refill((struct lu_env *)env);
3933         if (rc != 0)
3934                 CERROR("Failure to refill session: '%d'\n", rc);
3935
3936         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
3937
3938         EXIT;
3939 class_detach:
3940         if (rc)
3941                 class_detach(obd, lcfg);
3942 lcfg_cleanup:
3943         lustre_cfg_free(lcfg);
3944 free_bufs:
3945         OBD_FREE_PTR(bufs);
3946 cleanup_mem:
3947         if (name)
3948                 OBD_FREE(name, name_size);
3949         if (uuid)
3950                 OBD_FREE(uuid, uuid_size);
3951         RETURN(rc);
3952 }
3953
3954 /* setup quota master target on MDT0 */
3955 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
3956                           struct lustre_cfg *cfg)
3957 {
3958         struct obd_device       *obd;
3959         char                    *dev = lustre_cfg_string(cfg, 0);
3960         char                    *qmtname, *uuid, *p;
3961         struct lustre_cfg_bufs  *bufs;
3962         struct lustre_cfg       *lcfg;
3963         struct lustre_profile   *lprof;
3964         struct obd_connect_data *data;
3965         int                      rc;
3966         ENTRY;
3967
3968         LASSERT(mdt->mdt_qmt_exp == NULL);
3969         LASSERT(mdt->mdt_qmt_dev == NULL);
3970
3971         /* quota master is on MDT0 only for now */
3972         if (mdt->mdt_seq_site.ss_node_id != 0)
3973                 RETURN(0);
3974
3975         /* MGS generates config commands which look as follows:
3976          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3977          *                    3:lustre-MDT0000-mdtlov  4:f
3978          *
3979          * We generate the QMT name from the MDT one, just replacing MD with QM
3980          * after all the preparations, the logical equivalent will be:
3981          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
3982          *                    3:lustre-MDT0000-osd  4:f */
3983         OBD_ALLOC(qmtname, MAX_OBD_NAME);
3984         OBD_ALLOC(uuid, UUID_MAX);
3985         OBD_ALLOC_PTR(bufs);
3986         OBD_ALLOC_PTR(data);
3987         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
3988                 GOTO(cleanup_mem, rc = -ENOMEM);
3989
3990         strcpy(qmtname, dev);
3991         p = strstr(qmtname, "-MDT");
3992         if (p == NULL)
3993                 GOTO(cleanup_mem, rc = -ENOMEM);
3994         /* replace MD with QM */
3995         p[1] = 'Q';
3996         p[2] = 'M';
3997
3998         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
3999
4000         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4001         if (lprof == NULL || lprof->lp_dt == NULL) {
4002                 CERROR("can't find profile for %s\n",
4003                        lustre_cfg_string(cfg, 0));
4004                 GOTO(cleanup_mem, rc = -EINVAL);
4005         }
4006
4007         lustre_cfg_bufs_reset(bufs, qmtname);
4008         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4009         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4010         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4011
4012         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4013         if (lcfg == NULL)
4014                 GOTO(cleanup_mem, rc = -ENOMEM);
4015
4016         rc = class_attach(lcfg);
4017         if (rc)
4018                 GOTO(lcfg_cleanup, rc);
4019
4020         obd = class_name2obd(qmtname);
4021         if (!obd) {
4022                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4023                        lustre_cfg_string(cfg, 0));
4024                 GOTO(lcfg_cleanup, rc = -EINVAL);
4025         }
4026
4027         lustre_cfg_free(lcfg);
4028
4029         lustre_cfg_bufs_reset(bufs, qmtname);
4030         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4031         lustre_cfg_bufs_set_string(bufs, 2, dev);
4032
4033         /* for quota, the next device should be the OSD device */
4034         lustre_cfg_bufs_set_string(bufs, 3,
4035                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4036
4037         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4038         if (lcfg == NULL)
4039                 GOTO(class_detach, rc = -ENOMEM);
4040
4041         rc = class_setup(obd, lcfg);
4042         if (rc)
4043                 GOTO(class_detach, rc);
4044
4045         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4046
4047         /* configure local quota objects */
4048         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4049                                                    &mdt->mdt_lu_dev,
4050                                                    mdt->mdt_qmt_dev);
4051         if (rc)
4052                 GOTO(class_cleanup, rc);
4053
4054         /* connect to quota master target */
4055         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4056         data->ocd_version = LUSTRE_VERSION_CODE;
4057         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4058                          data, NULL);
4059         if (rc) {
4060                 CERROR("cannot connect to quota master device %s (%d)\n",
4061                        qmtname, rc);
4062                 GOTO(class_cleanup, rc);
4063         }
4064
4065         EXIT;
4066 class_cleanup:
4067         if (rc) {
4068                 class_manual_cleanup(obd);
4069                 mdt->mdt_qmt_dev = NULL;
4070         }
4071 class_detach:
4072         if (rc)
4073                 class_detach(obd, lcfg);
4074 lcfg_cleanup:
4075         lustre_cfg_free(lcfg);
4076 cleanup_mem:
4077         if (bufs)
4078                 OBD_FREE_PTR(bufs);
4079         if (qmtname)
4080                 OBD_FREE(qmtname, MAX_OBD_NAME);
4081         if (uuid)
4082                 OBD_FREE(uuid, UUID_MAX);
4083         if (data)
4084                 OBD_FREE_PTR(data);
4085         return rc;
4086 }
4087
4088 /* Shutdown quota master target associated with mdt */
4089 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4090 {
4091         ENTRY;
4092
4093         if (mdt->mdt_qmt_exp == NULL)
4094                 RETURN_EXIT;
4095         LASSERT(mdt->mdt_qmt_dev != NULL);
4096
4097         /* the qmt automatically shuts down when the mdt disconnects */
4098         obd_disconnect(mdt->mdt_qmt_exp);
4099         mdt->mdt_qmt_exp = NULL;
4100         mdt->mdt_qmt_dev = NULL;
4101         EXIT;
4102 }
4103
4104 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4105  * for now. This will be removed along with converting rest of MDT code
4106  * to use tgt_session_info */
4107 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4108 {
4109         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4110         int                      rc;
4111
4112         rc = mdt_getxattr(info);
4113
4114         mdt_thread_info_fini(info);
4115         return rc;
4116 }
4117
4118 static struct tgt_handler mdt_tgt_handlers[] = {
4119 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4120                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4121                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4122 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4123                 0,                      MDS_DISCONNECT, tgt_disconnect,
4124                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4125 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4126                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4127                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4128 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4129 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
4130 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4131 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4132                                                         mdt_getattr_name),
4133 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4134 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4135 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4136 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4137 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4138 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4139 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4140 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4141                                                         mdt_hsm_progress),
4142 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4143                                                         mdt_hsm_ct_register),
4144 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4145                                                         mdt_hsm_ct_unregister),
4146 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4147                                                         mdt_hsm_state_get),
4148 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4149                                                         mdt_hsm_state_set),
4150 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4151 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4152                                                         mdt_hsm_request),
4153 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4154             MDS_SWAP_LAYOUTS,
4155             mdt_swap_layouts),
4156 };
4157
4158 static struct tgt_handler mdt_sec_ctx_ops[] = {
4159 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4160 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4161 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4162 };
4163
4164 static struct tgt_handler mdt_quota_ops[] = {
4165 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4166 };
4167
4168 static struct tgt_opc_slice mdt_common_slice[] = {
4169         {
4170                 .tos_opc_start  = MDS_FIRST_OPC,
4171                 .tos_opc_end    = MDS_LAST_OPC,
4172                 .tos_hs         = mdt_tgt_handlers
4173         },
4174         {
4175                 .tos_opc_start  = OBD_FIRST_OPC,
4176                 .tos_opc_end    = OBD_LAST_OPC,
4177                 .tos_hs         = tgt_obd_handlers
4178         },
4179         {
4180                 .tos_opc_start  = LDLM_FIRST_OPC,
4181                 .tos_opc_end    = LDLM_LAST_OPC,
4182                 .tos_hs         = tgt_dlm_handlers
4183         },
4184         {
4185                 .tos_opc_start  = SEC_FIRST_OPC,
4186                 .tos_opc_end    = SEC_LAST_OPC,
4187                 .tos_hs         = mdt_sec_ctx_ops
4188         },
4189         {
4190                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4191                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4192                 .tos_hs         = tgt_out_handlers
4193         },
4194         {
4195                 .tos_opc_start  = FLD_FIRST_OPC,
4196                 .tos_opc_end    = FLD_LAST_OPC,
4197                 .tos_hs         = fld_handlers
4198         },
4199         {
4200                 .tos_opc_start  = SEQ_FIRST_OPC,
4201                 .tos_opc_end    = SEQ_LAST_OPC,
4202                 .tos_hs         = seq_handlers
4203         },
4204         {
4205                 .tos_opc_start  = QUOTA_DQACQ,
4206                 .tos_opc_end    = QUOTA_LAST_OPC,
4207                 .tos_hs         = mdt_quota_ops
4208         },
4209         {
4210                 .tos_opc_start  = LLOG_FIRST_OPC,
4211                 .tos_opc_end    = LLOG_LAST_OPC,
4212                 .tos_hs         = tgt_llog_handlers
4213         },
4214         {
4215                 .tos_opc_start  = LFSCK_FIRST_OPC,
4216                 .tos_opc_end    = LFSCK_LAST_OPC,
4217                 .tos_hs         = tgt_lfsck_handlers
4218         },
4219
4220         {
4221                 .tos_hs         = NULL
4222         }
4223 };
4224
4225 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4226 {
4227         struct md_device        *next = m->mdt_child;
4228         struct lu_device        *d    = &m->mdt_lu_dev;
4229         struct obd_device       *obd  = mdt2obd_dev(m);
4230         struct lfsck_stop        stop;
4231         ENTRY;
4232
4233         stop.ls_status = LS_PAUSED;
4234         stop.ls_flags = 0;
4235         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4236
4237         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4238         target_recovery_fini(obd);
4239         ping_evictor_stop();
4240
4241         if (m->mdt_opts.mo_coordinator)
4242                 mdt_hsm_cdt_stop(m);
4243
4244         mdt_hsm_cdt_fini(m);
4245
4246         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4247         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4248
4249         if (m->mdt_namespace != NULL)
4250                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
4251                                           d->ld_obd->obd_force);
4252
4253         obd_exports_barrier(obd);
4254         obd_zombie_barrier();
4255
4256         mdt_procfs_fini(m);
4257
4258         tgt_fini(env, &m->mdt_lut);
4259         mdt_fs_cleanup(env, m);
4260         upcall_cache_cleanup(m->mdt_identity_cache);
4261         m->mdt_identity_cache = NULL;
4262
4263         if (m->mdt_namespace != NULL) {
4264                 ldlm_namespace_free_post(m->mdt_namespace);
4265                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4266         }
4267
4268         mdt_quota_fini(env, m);
4269
4270         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4271
4272         mdt_seq_fini(env, m);
4273         mdt_fld_fini(env, m);
4274
4275         /*
4276          * Finish the stack
4277          */
4278         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4279
4280         LASSERT(atomic_read(&d->ld_ref) == 0);
4281
4282         server_put_mount(mdt_obd_name(m), true);
4283
4284         EXIT;
4285 }
4286
4287 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4288
4289 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4290                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4291 {
4292         struct mdt_thread_info    *info;
4293         struct obd_device         *obd;
4294         const char                *dev = lustre_cfg_string(cfg, 0);
4295         const char                *num = lustre_cfg_string(cfg, 2);
4296         struct lustre_mount_info  *lmi = NULL;
4297         struct lustre_sb_info     *lsi;
4298         struct lu_site            *s;
4299         struct seq_server_site    *ss_site;
4300         const char                *identity_upcall = "NONE";
4301         struct md_device          *next;
4302         int                        rc;
4303         long                       node_id;
4304         mntopt_t                   mntopts;
4305         ENTRY;
4306
4307         lu_device_init(&m->mdt_lu_dev, ldt);
4308         /*
4309          * Environment (env) might be missing mdt_thread_key values at that
4310          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4311          * mode.
4312          *
4313          * Usually device allocation path doesn't use module key values, but
4314          * mdt has to do a lot of work here, so allocate key value.
4315          */
4316         rc = lu_env_refill((struct lu_env *)env);
4317         if (rc != 0)
4318                 RETURN(rc);
4319
4320         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4321         LASSERT(info != NULL);
4322
4323         obd = class_name2obd(dev);
4324         LASSERT(obd != NULL);
4325
4326         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4327
4328         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4329
4330         /* default is coordinator off, it is started through conf_param
4331          * or /proc */
4332         m->mdt_opts.mo_coordinator = 0;
4333
4334         lmi = server_get_mount(dev);
4335         if (lmi == NULL) {
4336                 CERROR("Cannot get mount info for %s!\n", dev);
4337                 RETURN(-EFAULT);
4338         } else {
4339                 lsi = s2lsi(lmi->lmi_sb);
4340                 /* CMD is supported only in IAM mode */
4341                 LASSERT(num);
4342                 node_id = simple_strtol(num, NULL, 10);
4343                 obd->u.obt.obt_magic = OBT_MAGIC;
4344         }
4345
4346         m->mdt_squash.rsi_uid = 0;
4347         m->mdt_squash.rsi_gid = 0;
4348         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4349         init_rwsem(&m->mdt_squash.rsi_sem);
4350         spin_lock_init(&m->mdt_osfs_lock);
4351         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4352         m->mdt_enable_remote_dir = 0;
4353         m->mdt_enable_remote_dir_gid = 0;
4354
4355         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4356         m->mdt_lu_dev.ld_obd = obd;
4357         /* Set this lu_device to obd for error handling purposes. */
4358         obd->obd_lu_dev = &m->mdt_lu_dev;
4359
4360         /* init the stack */
4361         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4362         if (rc) {
4363                 CERROR("%s: Can't init device stack, rc %d\n",
4364                        mdt_obd_name(m), rc);
4365                 GOTO(err_lmi, rc);
4366         }
4367
4368         s = mdt_lu_site(m);
4369         ss_site = mdt_seq_site(m);
4370         s->ld_seq_site = ss_site;
4371         ss_site->ss_lu = s;
4372
4373         /* set server index */
4374         ss_site->ss_node_id = node_id;
4375
4376         /* failover is the default
4377          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4378          * assumed whose ss_node_id == 0 XXX
4379          * */
4380         obd->obd_replayable = 1;
4381         /* No connection accepted until configurations will finish */
4382         obd->obd_no_conn = 1;
4383
4384         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4385                 char *str = lustre_cfg_string(cfg, 4);
4386                 if (strchr(str, 'n')) {
4387                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4388                         obd->obd_replayable = 0;
4389                 }
4390         }
4391
4392         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4393         if (rc)
4394                 GOTO(err_fini_stack, rc);
4395
4396         rc = mdt_seq_init(env, m);
4397         if (rc)
4398                 GOTO(err_fini_fld, rc);
4399
4400         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4401                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4402         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4403                                               LDLM_NAMESPACE_SERVER,
4404                                               LDLM_NAMESPACE_GREEDY,
4405                                               LDLM_NS_TYPE_MDT);
4406         if (m->mdt_namespace == NULL)
4407                 GOTO(err_fini_seq, rc = -ENOMEM);
4408
4409         m->mdt_namespace->ns_lvbp = m;
4410         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4411
4412         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4413         /* set obd_namespace for compatibility with old code */
4414         obd->obd_namespace = m->mdt_namespace;
4415
4416         rc = mdt_hsm_cdt_init(m);
4417         if (rc != 0) {
4418                 CERROR("%s: error initializing coordinator, rc %d\n",
4419                        mdt_obd_name(m), rc);
4420                 GOTO(err_free_ns, rc);
4421         }
4422
4423         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4424                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4425                       OBD_FAIL_MDS_ALL_REPLY_NET);
4426         if (rc)
4427                 GOTO(err_free_hsm, rc);
4428
4429         rc = mdt_fs_setup(env, m, obd, lsi);
4430         if (rc)
4431                 GOTO(err_tgt, rc);
4432
4433         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4434
4435         next = m->mdt_child;
4436         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4437                                          &mntopts);
4438         if (rc)
4439                 GOTO(err_fs_cleanup, rc);
4440
4441         if (mntopts & MNTOPT_USERXATTR)
4442                 m->mdt_opts.mo_user_xattr = 1;
4443         else
4444                 m->mdt_opts.mo_user_xattr = 0;
4445
4446         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4447         if (rc)
4448                 GOTO(err_fs_cleanup, rc);
4449
4450         if (mntopts & MNTOPT_ACL)
4451                 m->mdt_opts.mo_acl = 1;
4452         else
4453                 m->mdt_opts.mo_acl = 0;
4454
4455         /* XXX: to support suppgid for ACL, we enable identity_upcall
4456          * by default, otherwise, maybe got unexpected -EACCESS. */
4457         if (m->mdt_opts.mo_acl)
4458                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4459
4460         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4461                                                 identity_upcall,
4462                                                 &mdt_identity_upcall_cache_ops);
4463         if (IS_ERR(m->mdt_identity_cache)) {
4464                 rc = PTR_ERR(m->mdt_identity_cache);
4465                 m->mdt_identity_cache = NULL;
4466                 GOTO(err_fs_cleanup, rc);
4467         }
4468
4469         rc = mdt_procfs_init(m, dev);
4470         if (rc) {
4471                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4472                 GOTO(err_recovery, rc);
4473         }
4474
4475         rc = mdt_quota_init(env, m, cfg);
4476         if (rc)
4477                 GOTO(err_procfs, rc);
4478
4479         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4480         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4481                            "mdt_ldlm_client", m->mdt_ldlm_client);
4482
4483         ping_evictor_start();
4484
4485         /* recovery will be started upon mdt_prepare()
4486          * when the whole stack is complete and ready
4487          * to serve the requests */
4488
4489         /* Reduce the initial timeout on an MDS because it doesn't need such
4490          * a long timeout as an OST does. Adaptive timeouts will adjust this
4491          * value appropriately. */
4492         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4493                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4494
4495         RETURN(0);
4496 err_procfs:
4497         mdt_procfs_fini(m);
4498 err_recovery:
4499         target_recovery_fini(obd);
4500         upcall_cache_cleanup(m->mdt_identity_cache);
4501         m->mdt_identity_cache = NULL;
4502 err_fs_cleanup:
4503         mdt_fs_cleanup(env, m);
4504 err_tgt:
4505         tgt_fini(env, &m->mdt_lut);
4506 err_free_hsm:
4507         mdt_hsm_cdt_fini(m);
4508 err_free_ns:
4509         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4510         obd->obd_namespace = m->mdt_namespace = NULL;
4511 err_fini_seq:
4512         mdt_seq_fini(env, m);
4513 err_fini_fld:
4514         mdt_fld_fini(env, m);
4515 err_fini_stack:
4516         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4517 err_lmi:
4518         if (lmi)
4519                 server_put_mount(dev, true);
4520         return(rc);
4521 }
4522
4523 /* For interoperability, the left element is old parameter, the right one
4524  * is the new version of the parameter, if some parameter is deprecated,
4525  * the new version should be set as NULL. */
4526 static struct cfg_interop_param mdt_interop_param[] = {
4527         { "mdt.group_upcall",   NULL },
4528         { "mdt.quota_type",     NULL },
4529         { "mdd.quota_type",     NULL },
4530         { "mdt.rootsquash",     "mdt.root_squash" },
4531         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4532         { NULL }
4533 };
4534
4535 /* used by MGS to process specific configurations */
4536 static int mdt_process_config(const struct lu_env *env,
4537                               struct lu_device *d, struct lustre_cfg *cfg)
4538 {
4539         struct mdt_device *m = mdt_dev(d);
4540         struct md_device *md_next = m->mdt_child;
4541         struct lu_device *next = md2lu_dev(md_next);
4542         int rc;
4543         ENTRY;
4544
4545         switch (cfg->lcfg_command) {
4546         case LCFG_PARAM: {
4547                 struct obd_device          *obd = d->ld_obd;
4548
4549                 /* For interoperability */
4550                 struct cfg_interop_param   *ptr = NULL;
4551                 struct lustre_cfg          *old_cfg = NULL;
4552                 char                       *param = NULL;
4553
4554                 param = lustre_cfg_string(cfg, 1);
4555                 if (param == NULL) {
4556                         CERROR("param is empty\n");
4557                         rc = -EINVAL;
4558                         break;
4559                 }
4560
4561                 ptr = class_find_old_param(param, mdt_interop_param);
4562                 if (ptr != NULL) {
4563                         if (ptr->new_param == NULL) {
4564                                 rc = 0;
4565                                 CWARN("For interoperability, skip this %s."
4566                                       " It is obsolete.\n", ptr->old_param);
4567                                 break;
4568                         }
4569
4570                         CWARN("Found old param %s, changed it to %s.\n",
4571                               ptr->old_param, ptr->new_param);
4572
4573                         old_cfg = cfg;
4574                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4575                         if (IS_ERR(cfg)) {
4576                                 rc = PTR_ERR(cfg);
4577                                 break;
4578                         }
4579                 }
4580
4581                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
4582                                               cfg, obd);
4583                 if (rc > 0 || rc == -ENOSYS) {
4584                         /* is it an HSM var ? */
4585                         rc = class_process_proc_param(PARAM_HSM,
4586                                                       hsm_cdt_get_proc_vars(),
4587                                                       cfg, obd);
4588                         if (rc > 0 || rc == -ENOSYS)
4589                                 /* we don't understand; pass it on */
4590                                 rc = next->ld_ops->ldo_process_config(env, next,
4591                                                                       cfg);
4592                 }
4593
4594                 if (old_cfg != NULL)
4595                         lustre_cfg_free(cfg);
4596
4597                 break;
4598         }
4599         default:
4600                 /* others are passed further */
4601                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4602                 break;
4603         }
4604         RETURN(rc);
4605 }
4606
4607 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4608                                           const struct lu_object_header *hdr,
4609                                           struct lu_device *d)
4610 {
4611         struct mdt_object *mo;
4612
4613         ENTRY;
4614
4615         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4616         if (mo != NULL) {
4617                 struct lu_object *o;
4618                 struct lu_object_header *h;
4619
4620                 o = &mo->mot_obj;
4621                 h = &mo->mot_header;
4622                 lu_object_header_init(h);
4623                 lu_object_init(o, h, d);
4624                 lu_object_add_top(h, o);
4625                 o->lo_ops = &mdt_obj_ops;
4626                 spin_lock_init(&mo->mot_write_lock);
4627                 mutex_init(&mo->mot_lov_mutex);
4628                 init_rwsem(&mo->mot_open_sem);
4629                 RETURN(o);
4630         }
4631         RETURN(NULL);
4632 }
4633
4634 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4635                            const struct lu_object_conf *unused)
4636 {
4637         struct mdt_device *d = mdt_dev(o->lo_dev);
4638         struct lu_device  *under;
4639         struct lu_object  *below;
4640         int                rc = 0;
4641         ENTRY;
4642
4643         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4644                PFID(lu_object_fid(o)));
4645
4646         under = &d->mdt_child->md_lu_dev;
4647         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4648         if (below != NULL) {
4649                 lu_object_add(o, below);
4650         } else
4651                 rc = -ENOMEM;
4652
4653         RETURN(rc);
4654 }
4655
4656 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4657 {
4658         struct mdt_object *mo = mdt_obj(o);
4659         struct lu_object_header *h;
4660         ENTRY;
4661
4662         h = o->lo_header;
4663         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4664                PFID(lu_object_fid(o)));
4665
4666         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4667         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4668
4669         lu_object_fini(o);
4670         lu_object_header_fini(h);
4671         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4672
4673         EXIT;
4674 }
4675
4676 static int mdt_object_print(const struct lu_env *env, void *cookie,
4677                             lu_printer_t p, const struct lu_object *o)
4678 {
4679         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4680
4681         return (*p)(env, cookie,
4682                     LUSTRE_MDT_NAME"-object@%p(flags=%d, writecount=%d)",
4683                     mdto, mdto->mot_flags, mdto->mot_write_count);
4684 }
4685
4686 static int mdt_prepare(const struct lu_env *env,
4687                 struct lu_device *pdev,
4688                 struct lu_device *cdev)
4689 {
4690         struct mdt_device *mdt = mdt_dev(cdev);
4691         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4692         struct obd_device *obd = cdev->ld_obd;
4693         int rc;
4694
4695         ENTRY;
4696
4697         LASSERT(obd);
4698
4699         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4700         if (rc)
4701                 RETURN(rc);
4702
4703         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4704         if (rc)
4705                 RETURN(rc);
4706
4707         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4708         if (rc)
4709                 RETURN(rc);
4710
4711         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4712         /* The LFSCK instance is registered just now, so it must be there when
4713          * register the namespace to such instance. */
4714         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4715
4716         if (mdt->mdt_seq_site.ss_node_id == 0) {
4717                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4718                                                          &mdt->mdt_md_root_fid);
4719                 if (rc)
4720                         RETURN(rc);
4721         }
4722
4723         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4724
4725         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4726         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4727         LASSERT(obd->obd_no_conn);
4728         spin_lock(&obd->obd_dev_lock);
4729         obd->obd_no_conn = 0;
4730         spin_unlock(&obd->obd_dev_lock);
4731
4732         if (obd->obd_recovering == 0)
4733                 mdt_postrecov(env, mdt);
4734
4735         RETURN(rc);
4736 }
4737
4738 const struct lu_device_operations mdt_lu_ops = {
4739         .ldo_object_alloc   = mdt_object_alloc,
4740         .ldo_process_config = mdt_process_config,
4741         .ldo_prepare        = mdt_prepare,
4742 };
4743
4744 static const struct lu_object_operations mdt_obj_ops = {
4745         .loo_object_init    = mdt_object_init,
4746         .loo_object_free    = mdt_object_free,
4747         .loo_object_print   = mdt_object_print
4748 };
4749
4750 static int mdt_obd_set_info_async(const struct lu_env *env,
4751                                   struct obd_export *exp,
4752                                   __u32 keylen, void *key,
4753                                   __u32 vallen, void *val,
4754                                   struct ptlrpc_request_set *set)
4755 {
4756         int rc;
4757
4758         ENTRY;
4759
4760         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4761                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4762                 RETURN(rc);
4763         }
4764
4765         RETURN(0);
4766 }
4767
4768 /**
4769  * Match client and server connection feature flags.
4770  *
4771  * Compute the compatibility flags for a connection request based on
4772  * features mutually supported by client and server.
4773  *
4774  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4775  * must not be updated here, otherwise a partially initialized value may
4776  * be exposed. After the connection request is successfully processed,
4777  * the top-level MDT connect request handler atomically updates the export
4778  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4779  * reply. \see mdt_connect().
4780  *
4781  * \param exp   the obd_export associated with this client/target pair
4782  * \param mdt   the target device for the connection
4783  * \param data  stores data for this connect request
4784  *
4785  * \retval 0       success
4786  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4787  * \retval -EBADE  client and server feature requirements are incompatible
4788  */
4789 static int mdt_connect_internal(struct obd_export *exp,
4790                                 struct mdt_device *mdt,
4791                                 struct obd_connect_data *data)
4792 {
4793         LASSERT(data != NULL);
4794
4795         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4796         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4797
4798         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
4799             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
4800                 CWARN("%s: client %s does not support ibits lock, either "
4801                       "very old or an invalid client: flags "LPX64"\n",
4802                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
4803                       data->ocd_connect_flags);
4804                 return -EBADE;
4805         }
4806
4807         if (!mdt->mdt_opts.mo_acl)
4808                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4809
4810         if (!mdt->mdt_opts.mo_user_xattr)
4811                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4812
4813         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4814                 data->ocd_brw_size = min(data->ocd_brw_size,
4815                                          (__u32)MD_MAX_BRW_SIZE);
4816                 if (data->ocd_brw_size == 0) {
4817                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4818                                " ocd_version: %x ocd_grant: %d "
4819                                "ocd_index: %u ocd_brw_size is "
4820                                "unexpectedly zero, network data "
4821                                "corruption? Refusing connection of this"
4822                                " client\n",
4823                                mdt_obd_name(mdt),
4824                                exp->exp_client_uuid.uuid,
4825                                exp, data->ocd_connect_flags, data->ocd_version,
4826                                data->ocd_grant, data->ocd_index);
4827                         return -EPROTO;
4828                 }
4829         }
4830
4831         /* NB: Disregard the rule against updating
4832          * exp_connect_data.ocd_connect_flags in this case, since
4833          * tgt_client_new() needs to know if this is a lightweight
4834          * connection, and it is safe to expose this flag before
4835          * connection processing completes. */
4836         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
4837                 spin_lock(&exp->exp_lock);
4838                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
4839                 spin_unlock(&exp->exp_lock);
4840         }
4841
4842         data->ocd_version = LUSTRE_VERSION_CODE;
4843
4844         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
4845                 CWARN("%s: MDS requires FID support, but client not\n",
4846                       mdt_obd_name(mdt));
4847                 return -EBADE;
4848         }
4849
4850         if (OCD_HAS_FLAG(data, PINGLESS)) {
4851                 if (ptlrpc_pinger_suppress_pings()) {
4852                         spin_lock(&exp->exp_obd->obd_dev_lock);
4853                         list_del_init(&exp->exp_obd_chain_timed);
4854                         spin_unlock(&exp->exp_obd->obd_dev_lock);
4855                 } else {
4856                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
4857                 }
4858         }
4859
4860         data->ocd_max_easize = mdt->mdt_max_ea_size;
4861
4862         /* NB: Disregard the rule against updating
4863          * exp_connect_data.ocd_connect_flags in this case, since
4864          * tgt_client_new() needs to know if this is client supports
4865          * multiple modify RPCs, and it is safe to expose this flag before
4866          * connection processing completes. */
4867         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
4868                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
4869                 spin_lock(&exp->exp_lock);
4870                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
4871                 spin_unlock(&exp->exp_lock);
4872         }
4873
4874         return 0;
4875 }
4876
4877 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
4878                                    struct mdt_thread_info *info,
4879                                    struct mdt_file_data *mfd)
4880 {
4881         struct lu_context ses;
4882         int rc;
4883         ENTRY;
4884
4885         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
4886         if (rc)
4887                 RETURN(rc);
4888
4889         env->le_ses = &ses;
4890         lu_context_enter(&ses);
4891
4892         mdt_ucred(info)->uc_valid = UCRED_OLD;
4893         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
4894
4895         lu_context_exit(&ses);
4896         lu_context_fini(&ses);
4897         env->le_ses = NULL;
4898
4899         RETURN(rc);
4900 }
4901
4902 static int mdt_export_cleanup(struct obd_export *exp)
4903 {
4904         struct list_head         closing_list;
4905         struct mdt_export_data  *med = &exp->exp_mdt_data;
4906         struct obd_device       *obd = exp->exp_obd;
4907         struct mdt_device       *mdt;
4908         struct mdt_thread_info  *info;
4909         struct lu_env            env;
4910         struct mdt_file_data    *mfd, *n;
4911         int rc = 0;
4912         ENTRY;
4913
4914         INIT_LIST_HEAD(&closing_list);
4915         spin_lock(&med->med_open_lock);
4916         while (!list_empty(&med->med_open_head)) {
4917                 struct list_head *tmp = med->med_open_head.next;
4918                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
4919
4920                 /* Remove mfd handle so it can't be found again.
4921                  * We are consuming the mfd_list reference here. */
4922                 class_handle_unhash(&mfd->mfd_handle);
4923                 list_move_tail(&mfd->mfd_list, &closing_list);
4924         }
4925         spin_unlock(&med->med_open_lock);
4926         mdt = mdt_dev(obd->obd_lu_dev);
4927         LASSERT(mdt != NULL);
4928
4929         rc = lu_env_init(&env, LCT_MD_THREAD);
4930         if (rc)
4931                 RETURN(rc);
4932
4933         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
4934         LASSERT(info != NULL);
4935         memset(info, 0, sizeof *info);
4936         info->mti_env = &env;
4937         info->mti_mdt = mdt;
4938         info->mti_exp = exp;
4939
4940         if (!list_empty(&closing_list)) {
4941                 struct md_attr *ma = &info->mti_attr;
4942
4943                 /* Close any open files (which may also cause orphan
4944                  * unlinking). */
4945                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
4946                         list_del_init(&mfd->mfd_list);
4947                         ma->ma_need = ma->ma_valid = 0;
4948
4949                         /* This file is being closed due to an eviction, it
4950                          * could have been modified and now dirty regarding to
4951                          * HSM archive, check this!
4952                          * The logic here is to mark a file dirty if there's a
4953                          * chance it was dirtied before the client was evicted,
4954                          * so that we don't have to wait for a release attempt
4955                          * before finding out the file was actually dirty and
4956                          * fail the release. Aggressively marking it dirty here
4957                          * will cause the policy engine to attempt to
4958                          * re-archive it; when rearchiving, we can compare the
4959                          * current version to the HSM data_version and make the
4960                          * archive request into a noop if it's not actually
4961                          * dirty.
4962                          */
4963                         if (mfd->mfd_mode & FMODE_WRITE)
4964                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
4965
4966                         /* Don't unlink orphan on failover umount, LU-184 */
4967                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
4968                                 ma->ma_valid = MA_FLAGS;
4969                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
4970                         }
4971                         mdt_mfd_close(info, mfd);
4972                 }
4973         }
4974         info->mti_mdt = NULL;
4975         /* cleanup client slot early */
4976         /* Do not erase record for recoverable client. */
4977         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
4978                 tgt_client_del(&env, exp);
4979         lu_env_fini(&env);
4980
4981         RETURN(rc);
4982 }
4983
4984 static int mdt_obd_disconnect(struct obd_export *exp)
4985 {
4986         int rc;
4987         ENTRY;
4988
4989         LASSERT(exp);
4990         class_export_get(exp);
4991
4992         nodemap_del_member(exp);
4993         rc = server_disconnect_export(exp);
4994         if (rc != 0)
4995                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
4996
4997         rc = mdt_export_cleanup(exp);
4998         class_export_put(exp);
4999         RETURN(rc);
5000 }
5001
5002 /* mds_connect copy */
5003 static int mdt_obd_connect(const struct lu_env *env,
5004                            struct obd_export **exp, struct obd_device *obd,
5005                            struct obd_uuid *cluuid,
5006                            struct obd_connect_data *data,
5007                            void *localdata)
5008 {
5009         struct obd_export       *lexp;
5010         struct lustre_handle    conn = { 0 };
5011         struct mdt_device       *mdt;
5012         int                      rc;
5013         lnet_nid_t              *client_nid = localdata;
5014         ENTRY;
5015
5016         LASSERT(env != NULL);
5017         if (!exp || !obd || !cluuid)
5018                 RETURN(-EINVAL);
5019
5020         mdt = mdt_dev(obd->obd_lu_dev);
5021
5022         /*
5023          * first, check whether the stack is ready to handle requests
5024          * XXX: probably not very appropriate method is used now
5025          *      at some point we should find a better one
5026          */
5027         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
5028             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
5029             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
5030                 rc = obd_get_info(env, mdt->mdt_child_exp,
5031                                   sizeof(KEY_OSP_CONNECTED),
5032                                   KEY_OSP_CONNECTED, NULL, NULL);
5033                 if (rc)
5034                         RETURN(-EAGAIN);
5035                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5036         }
5037
5038         rc = class_connect(&conn, obd, cluuid);
5039         if (rc)
5040                 RETURN(rc);
5041
5042         lexp = class_conn2export(&conn);
5043         LASSERT(lexp != NULL);
5044
5045         rc = mdt_connect_internal(lexp, mdt, data);
5046         if (rc == 0) {
5047                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5048
5049                 LASSERT(lcd);
5050                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5051                 rc = tgt_client_new(env, lexp);
5052                 if (rc == 0) {
5053                         rc = nodemap_add_member(*client_nid, lexp);
5054                         if (rc != 0 && rc != -EEXIST)
5055                                 goto out;
5056
5057                         mdt_export_stats_init(obd, lexp, localdata);
5058                 }
5059         }
5060 out:
5061         if (rc != 0) {
5062                 class_disconnect(lexp);
5063                 *exp = NULL;
5064         } else {
5065                 *exp = lexp;
5066         }
5067
5068         RETURN(rc);
5069 }
5070
5071 static int mdt_obd_reconnect(const struct lu_env *env,
5072                              struct obd_export *exp, struct obd_device *obd,
5073                              struct obd_uuid *cluuid,
5074                              struct obd_connect_data *data,
5075                              void *localdata)
5076 {
5077         lnet_nid_t             *client_nid = localdata;
5078         int                     rc;
5079         ENTRY;
5080
5081         if (exp == NULL || obd == NULL || cluuid == NULL)
5082                 RETURN(-EINVAL);
5083
5084         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5085         if (rc == 0) {
5086                 rc = nodemap_add_member(*client_nid, exp);
5087                 if (rc == 0 || rc == -EEXIST)
5088                         mdt_export_stats_init(obd, exp, localdata);
5089         }
5090
5091         RETURN(rc);
5092 }
5093
5094 /* FIXME: Can we avoid using these two interfaces? */
5095 static int mdt_init_export(struct obd_export *exp)
5096 {
5097         struct mdt_export_data *med = &exp->exp_mdt_data;
5098         int                     rc;
5099         ENTRY;
5100
5101         INIT_LIST_HEAD(&med->med_open_head);
5102         spin_lock_init(&med->med_open_lock);
5103         mutex_init(&med->med_idmap_mutex);
5104         med->med_idmap = NULL;
5105         spin_lock(&exp->exp_lock);
5106         exp->exp_connecting = 1;
5107         spin_unlock(&exp->exp_lock);
5108
5109         /* self-export doesn't need client data and ldlm initialization */
5110         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5111                                      &exp->exp_client_uuid)))
5112                 RETURN(0);
5113
5114         rc = tgt_client_alloc(exp);
5115         if (rc)
5116                 GOTO(err, rc);
5117
5118         rc = ldlm_init_export(exp);
5119         if (rc)
5120                 GOTO(err_free, rc);
5121
5122         RETURN(rc);
5123
5124 err_free:
5125         tgt_client_free(exp);
5126 err:
5127         CERROR("%s: Failed to initialize export: rc = %d\n",
5128                exp->exp_obd->obd_name, rc);
5129         return rc;
5130 }
5131
5132 static int mdt_destroy_export(struct obd_export *exp)
5133 {
5134         ENTRY;
5135
5136         if (exp_connect_rmtclient(exp))
5137                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5138
5139         target_destroy_export(exp);
5140         /* destroy can be called from failed obd_setup, so
5141          * checking uuid is safer than obd_self_export */
5142         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5143                                      &exp->exp_client_uuid)))
5144                 RETURN(0);
5145
5146         ldlm_destroy_export(exp);
5147         tgt_client_free(exp);
5148
5149         LASSERT(list_empty(&exp->exp_outstanding_replies));
5150         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5151
5152         RETURN(0);
5153 }
5154
5155 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5156                    struct linkea_data *ldata)
5157 {
5158         int rc;
5159
5160         LASSERT(ldata->ld_buf->lb_buf != NULL);
5161
5162         if (!mdt_object_exists(mdt_obj))
5163                 return -ENODATA;
5164
5165         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5166                           ldata->ld_buf, XATTR_NAME_LINK);
5167         if (rc == -ERANGE) {
5168                 /* Buf was too small, figure out what we need. */
5169                 lu_buf_free(ldata->ld_buf);
5170                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5171                                   ldata->ld_buf, XATTR_NAME_LINK);
5172                 if (rc < 0)
5173                         return rc;
5174                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5175                 if (ldata->ld_buf->lb_buf == NULL)
5176                         return -ENOMEM;
5177                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5178                                   ldata->ld_buf, XATTR_NAME_LINK);
5179         }
5180         if (rc < 0)
5181                 return rc;
5182
5183         return linkea_init(ldata);
5184 }
5185
5186 /**
5187  * Given an MDT object, try to look up the full path to the object.
5188  * Part of the MDT layer implementation of lfs fid2path.
5189  *
5190  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5191  * \param[in]     obj   Object to do path lookup of
5192  * \param[in,out] fp    User-provided struct to store path information
5193  *
5194  * \retval 0 Lookup successful, path information stored in fp
5195  * \retval -EAGAIN Lookup failed, usually because object is being moved
5196  * \retval negative errno if there was a problem
5197  */
5198 static int mdt_path_current(struct mdt_thread_info *info,
5199                             struct mdt_object *obj,
5200                             struct getinfo_fid2path *fp)
5201 {
5202         struct mdt_device       *mdt = info->mti_mdt;
5203         struct mdt_object       *mdt_obj;
5204         struct link_ea_header   *leh;
5205         struct link_ea_entry    *lee;
5206         struct lu_name          *tmpname = &info->mti_name;
5207         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5208         struct lu_buf           *buf = &info->mti_big_buf;
5209         char                    *ptr;
5210         int                     reclen;
5211         struct linkea_data      ldata = { NULL };
5212         int                     rc = 0;
5213         bool                    first = true;
5214         ENTRY;
5215
5216         /* temp buffer for path element, the buffer will be finally freed
5217          * in mdt_thread_info_fini */
5218         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5219         if (buf->lb_buf == NULL)
5220                 RETURN(-ENOMEM);
5221
5222         ldata.ld_buf = buf;
5223         ptr = fp->gf_path + fp->gf_pathlen - 1;
5224         *ptr = 0;
5225         --ptr;
5226         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5227
5228         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5229          * so checking root_fid can only happen on MDT0. */
5230         while (!lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid)) {
5231                 struct lu_buf           lmv_buf;
5232
5233                 mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5234                 if (IS_ERR(mdt_obj))
5235                         GOTO(out, rc = PTR_ERR(mdt_obj));
5236
5237                 if (!mdt_object_exists(mdt_obj)) {
5238                         mdt_object_put(info->mti_env, mdt_obj);
5239                         GOTO(out, rc = -ENOENT);
5240                 }
5241
5242                 if (mdt_object_remote(mdt_obj)) {
5243                         mdt_object_put(info->mti_env, mdt_obj);
5244                         GOTO(remote_out, rc = -EREMOTE);
5245                 }
5246
5247                 rc = mdt_links_read(info, mdt_obj, &ldata);
5248                 if (rc != 0) {
5249                         mdt_object_put(info->mti_env, mdt_obj);
5250                         GOTO(out, rc);
5251                 }
5252
5253                 leh = buf->lb_buf;
5254                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5255                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5256                 /* If set, use link #linkno for path lookup, otherwise use
5257                    link #0.  Only do this for the final path element. */
5258                 if (first && fp->gf_linkno < leh->leh_reccount) {
5259                         int count;
5260                         for (count = 0; count < fp->gf_linkno; count++) {
5261                                 lee = (struct link_ea_entry *)
5262                                      ((char *)lee + reclen);
5263                                 linkea_entry_unpack(lee, &reclen, tmpname,
5264                                                     tmpfid);
5265                         }
5266                         if (fp->gf_linkno < leh->leh_reccount - 1)
5267                                 /* indicate to user there are more links */
5268                                 fp->gf_linkno++;
5269                 }
5270
5271                 lmv_buf.lb_buf = info->mti_xattr_buf;
5272                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5273                 /* Check if it is slave stripes */
5274                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5275                                   &lmv_buf, XATTR_NAME_LMV);
5276                 mdt_object_put(info->mti_env, mdt_obj);
5277                 if (rc > 0) {
5278                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5279
5280                         /* For slave stripes, get its master */
5281                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5282                                 fp->gf_fid = *tmpfid;
5283                                 continue;
5284                         }
5285                 } else if (rc < 0 && rc != -ENODATA) {
5286                         GOTO(out, rc);
5287                 }
5288
5289                 rc = 0;
5290
5291                 /* Pack the name in the end of the buffer */
5292                 ptr -= tmpname->ln_namelen;
5293                 if (ptr - 1 <= fp->gf_path)
5294                         GOTO(out, rc = -EOVERFLOW);
5295                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5296                 *(--ptr) = '/';
5297
5298                 /* keep the last resolved fid to the client, so the
5299                  * client will build the left path on another MDT for
5300                  * remote object */
5301                 fp->gf_fid = *tmpfid;
5302
5303                 first = false;
5304         }
5305
5306 remote_out:
5307         ptr++; /* skip leading / */
5308         memmove(fp->gf_path, ptr, fp->gf_path + fp->gf_pathlen - ptr);
5309
5310 out:
5311         RETURN(rc);
5312 }
5313
5314 /**
5315  * Given an MDT object, use mdt_path_current to get the path.
5316  * Essentially a wrapper to retry mdt_path_current a set number of times
5317  * if -EAGAIN is returned (usually because an object is being moved).
5318  *
5319  * Part of the MDT layer implementation of lfs fid2path.
5320  *
5321  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5322  * \param[in]     obj   Object to do path lookup of
5323  * \param[in,out] fp    User-provided struct for arguments and to store path
5324  *                      information
5325  *
5326  * \retval 0 Lookup successful, path information stored in fp
5327  * \retval negative errno if there was a problem
5328  */
5329 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5330                     struct getinfo_fid2path *fp)
5331 {
5332         struct mdt_device       *mdt = info->mti_mdt;
5333         int                     tries = 3;
5334         int                     rc = -EAGAIN;
5335         ENTRY;
5336
5337         if (fp->gf_pathlen < 3)
5338                 RETURN(-EOVERFLOW);
5339
5340         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5341                 fp->gf_path[0] = '\0';
5342                 RETURN(0);
5343         }
5344
5345         /* Retry multiple times in case file is being moved */
5346         while (tries-- && rc == -EAGAIN)
5347                 rc = mdt_path_current(info, obj, fp);
5348
5349         RETURN(rc);
5350 }
5351
5352 /**
5353  * Get the full path of the provided FID, as of changelog record recno.
5354  *
5355  * This checks sanity and looks up object for user provided FID
5356  * before calling the actual path lookup code.
5357  *
5358  * Part of the MDT layer implementation of lfs fid2path.
5359  *
5360  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5361  * \param[in,out] fp    User-provided struct for arguments and to store path
5362  *                      information
5363  *
5364  * \retval 0 Lookup successful, path information and recno stored in fp
5365  * \retval -ENOENT, object does not exist
5366  * \retval negative errno if there was a problem
5367  */
5368 static int mdt_fid2path(struct mdt_thread_info *info,
5369                         struct getinfo_fid2path *fp)
5370 {
5371         struct mdt_device *mdt = info->mti_mdt;
5372         struct mdt_object *obj;
5373         int    rc;
5374         ENTRY;
5375
5376         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5377                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5378
5379         if (!fid_is_sane(&fp->gf_fid))
5380                 RETURN(-EINVAL);
5381
5382         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5383                 CWARN("%s: "DFID" is invalid, sequence should be "
5384                       ">= "LPX64"\n", mdt_obd_name(mdt),
5385                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5386                 RETURN(-EINVAL);
5387         }
5388
5389         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5390         if (IS_ERR(obj)) {
5391                 rc = PTR_ERR(obj);
5392                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5393                        PFID(&fp->gf_fid), rc);
5394                 RETURN(rc);
5395         }
5396
5397         if (mdt_object_remote(obj))
5398                 rc = -EREMOTE;
5399         else if (!mdt_object_exists(obj))
5400                 rc = -ENOENT;
5401         else
5402                 rc = 0;
5403
5404         if (rc < 0) {
5405                 mdt_object_put(info->mti_env, obj);
5406                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5407                        PFID(&fp->gf_fid), rc);
5408                 RETURN(rc);
5409         }
5410
5411         rc = mdt_path(info, obj, fp);
5412
5413         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5414                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5415
5416         mdt_object_put(info->mti_env, obj);
5417
5418         RETURN(rc);
5419 }
5420
5421 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5422                             void *val, int vallen)
5423 {
5424         struct getinfo_fid2path *fpout, *fpin;
5425         int rc = 0;
5426
5427         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5428         fpout = val;
5429
5430         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5431                 lustre_swab_fid2path(fpin);
5432
5433         memcpy(fpout, fpin, sizeof(*fpin));
5434         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5435                 RETURN(-EINVAL);
5436
5437         rc = mdt_fid2path(info, fpout);
5438         RETURN(rc);
5439 }
5440
5441 int mdt_get_info(struct tgt_session_info *tsi)
5442 {
5443         char    *key;
5444         int      keylen;
5445         __u32   *vallen;
5446         void    *valout;
5447         int      rc;
5448
5449         ENTRY;
5450
5451         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5452         if (key == NULL) {
5453                 CDEBUG(D_IOCTL, "No GETINFO key\n");
5454                 RETURN(err_serious(-EFAULT));
5455         }
5456         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5457                                       RCL_CLIENT);
5458
5459         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5460         if (vallen == NULL) {
5461                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
5462                                 tgt_name(tsi->tsi_tgt));
5463                 RETURN(err_serious(-EFAULT));
5464         }
5465
5466         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5467                              *vallen);
5468         rc = req_capsule_server_pack(tsi->tsi_pill);
5469         if (rc)
5470                 RETURN(err_serious(rc));
5471
5472         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5473         if (valout == NULL) {
5474                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
5475                                 tgt_name(tsi->tsi_tgt));
5476                 RETURN(err_serious(-EFAULT));
5477         }
5478
5479         if (KEY_IS(KEY_FID2PATH)) {
5480                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5481
5482                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5483                 mdt_thread_info_fini(info);
5484         } else {
5485                 rc = -EINVAL;
5486         }
5487         RETURN(rc);
5488 }
5489
5490 /* Pass the ioc down */
5491 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5492                          unsigned int cmd, int len, void *data)
5493 {
5494         struct lu_context ioctl_session;
5495         struct md_device *next = mdt->mdt_child;
5496         int rc;
5497         ENTRY;
5498
5499         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5500         if (rc)
5501                 RETURN(rc);
5502         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5503         lu_context_enter(&ioctl_session);
5504         env->le_ses = &ioctl_session;
5505
5506         LASSERT(next->md_ops->mdo_iocontrol);
5507         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5508
5509         lu_context_exit(&ioctl_session);
5510         lu_context_fini(&ioctl_session);
5511         RETURN(rc);
5512 }
5513
5514 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5515 {
5516         struct obd_ioctl_data *data = karg;
5517         struct lu_fid *fid;
5518         __u64 version;
5519         struct mdt_object *obj;
5520         struct mdt_lock_handle  *lh;
5521         int rc;
5522         ENTRY;
5523
5524         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5525             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5526                 RETURN(-EINVAL);
5527
5528         fid = (struct lu_fid *)data->ioc_inlbuf1;
5529
5530         if (!fid_is_sane(fid))
5531                 RETURN(-EINVAL);
5532
5533         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5534
5535         lh = &mti->mti_lh[MDT_LH_PARENT];
5536         mdt_lock_reg_init(lh, LCK_CR);
5537
5538         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5539         if (IS_ERR(obj))
5540                 RETURN(PTR_ERR(obj));
5541
5542         if (mdt_object_remote(obj)) {
5543                 rc = -EREMOTE;
5544                 /**
5545                  * before calling version get the correct MDS should be
5546                  * fid, this is error to find remote object here
5547                  */
5548                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5549         } else if (!mdt_object_exists(obj)) {
5550                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5551                 rc = -ENOENT;
5552         } else {
5553                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5554                *(__u64 *)data->ioc_inlbuf2 = version;
5555                 rc = 0;
5556         }
5557         mdt_object_unlock_put(mti, obj, lh, 1);
5558         RETURN(rc);
5559 }
5560
5561 /* ioctls on obd dev */
5562 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5563                          void *karg, void *uarg)
5564 {
5565         struct lu_env      env;
5566         struct obd_device *obd = exp->exp_obd;
5567         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5568         struct dt_device  *dt = mdt->mdt_bottom;
5569         int rc;
5570
5571         ENTRY;
5572         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5573         rc = lu_env_init(&env, LCT_MD_THREAD);
5574         if (rc)
5575                 RETURN(rc);
5576
5577         switch (cmd) {
5578         case OBD_IOC_SYNC:
5579                 rc = mdt_device_sync(&env, mdt);
5580                 break;
5581         case OBD_IOC_SET_READONLY:
5582                 rc = dt->dd_ops->dt_ro(&env, dt);
5583                 break;
5584         case OBD_IOC_ABORT_RECOVERY:
5585                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5586                 obd->obd_force_abort_recovery = 1;
5587                 target_stop_recovery_thread(obd);
5588                 rc = 0;
5589                 break;
5590         case OBD_IOC_CHANGELOG_REG:
5591         case OBD_IOC_CHANGELOG_DEREG:
5592         case OBD_IOC_CHANGELOG_CLEAR:
5593                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5594                 break;
5595         case OBD_IOC_START_LFSCK: {
5596                 struct md_device *next = mdt->mdt_child;
5597                 struct obd_ioctl_data *data = karg;
5598                 struct lfsck_start_param lsp;
5599
5600                 if (unlikely(data == NULL)) {
5601                         rc = -EINVAL;
5602                         break;
5603                 }
5604
5605                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5606                 lsp.lsp_index_valid = 0;
5607                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5608                 break;
5609         }
5610         case OBD_IOC_STOP_LFSCK: {
5611                 struct md_device        *next = mdt->mdt_child;
5612                 struct obd_ioctl_data   *data = karg;
5613                 struct lfsck_stop        stop;
5614
5615                 stop.ls_status = LS_STOPPED;
5616                 /* Old lfsck utils may pass NULL @stop. */
5617                 if (data->ioc_inlbuf1 == NULL)
5618                         stop.ls_flags = 0;
5619                 else
5620                         stop.ls_flags =
5621                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5622
5623                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5624                 break;
5625         }
5626         case OBD_IOC_GET_OBJ_VERSION: {
5627                 struct mdt_thread_info *mti;
5628                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5629                 memset(mti, 0, sizeof *mti);
5630                 mti->mti_env = &env;
5631                 mti->mti_mdt = mdt;
5632                 mti->mti_exp = exp;
5633
5634                 rc = mdt_ioc_version_get(mti, karg);
5635                 break;
5636         }
5637         case OBD_IOC_CATLOGLIST: {
5638                 struct mdt_thread_info *mti;
5639
5640                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5641                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5642                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5643                                        &mti->mti_tmp_fid1);
5644                 break;
5645          }
5646         default:
5647                 rc = -EOPNOTSUPP;
5648                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5649                         mdt_obd_name(mdt), cmd, rc);
5650         }
5651
5652         lu_env_fini(&env);
5653         RETURN(rc);
5654 }
5655
5656 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5657 {
5658         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5659         struct lfsck_start_param lsp;
5660         int rc;
5661         ENTRY;
5662
5663         lsp.lsp_start = NULL;
5664         lsp.lsp_index_valid = 0;
5665         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
5666                                                    OBD_IOC_START_LFSCK,
5667                                                    0, &lsp);
5668         if (rc != 0 && rc != -EALREADY)
5669                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
5670                       mdt_obd_name(mdt), rc);
5671
5672         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5673         RETURN(rc);
5674 }
5675
5676 static int mdt_obd_postrecov(struct obd_device *obd)
5677 {
5678         struct lu_env env;
5679         int rc;
5680
5681         rc = lu_env_init(&env, LCT_MD_THREAD);
5682         if (rc)
5683                 RETURN(rc);
5684         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5685         lu_env_fini(&env);
5686         return rc;
5687 }
5688
5689 static struct obd_ops mdt_obd_device_ops = {
5690         .o_owner          = THIS_MODULE,
5691         .o_set_info_async = mdt_obd_set_info_async,
5692         .o_connect        = mdt_obd_connect,
5693         .o_reconnect      = mdt_obd_reconnect,
5694         .o_disconnect     = mdt_obd_disconnect,
5695         .o_init_export    = mdt_init_export,
5696         .o_destroy_export = mdt_destroy_export,
5697         .o_iocontrol      = mdt_iocontrol,
5698         .o_postrecov      = mdt_obd_postrecov,
5699 };
5700
5701 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5702                                          struct lu_device *d)
5703 {
5704         struct mdt_device *m = mdt_dev(d);
5705         ENTRY;
5706
5707         mdt_fini(env, m);
5708         RETURN(NULL);
5709 }
5710
5711 static struct lu_device *mdt_device_free(const struct lu_env *env,
5712                                          struct lu_device *d)
5713 {
5714         struct mdt_device *m = mdt_dev(d);
5715         ENTRY;
5716
5717         lu_device_fini(&m->mdt_lu_dev);
5718         OBD_FREE_PTR(m);
5719
5720         RETURN(NULL);
5721 }
5722
5723 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5724                                           struct lu_device_type *t,
5725                                           struct lustre_cfg *cfg)
5726 {
5727         struct lu_device  *l;
5728         struct mdt_device *m;
5729
5730         OBD_ALLOC_PTR(m);
5731         if (m != NULL) {
5732                 int rc;
5733
5734                 l = &m->mdt_lu_dev;
5735                 rc = mdt_init0(env, m, t, cfg);
5736                 if (rc != 0) {
5737                         mdt_device_free(env, l);
5738                         l = ERR_PTR(rc);
5739                         return l;
5740                 }
5741         } else
5742                 l = ERR_PTR(-ENOMEM);
5743         return l;
5744 }
5745
5746 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5747 LU_KEY_INIT(mdt, struct mdt_thread_info);
5748
5749 static void mdt_key_fini(const struct lu_context *ctx,
5750                          struct lu_context_key *key, void* data)
5751 {
5752         struct mdt_thread_info *info = data;
5753
5754         if (info->mti_big_lmm) {
5755                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5756                 info->mti_big_lmm = NULL;
5757                 info->mti_big_lmmsize = 0;
5758         }
5759         OBD_FREE_PTR(info);
5760 }
5761
5762 /* context key: mdt_thread_key */
5763 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5764
5765 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5766 {
5767         return lu_ucred(info->mti_env);
5768 }
5769
5770 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5771 {
5772         return lu_ucred_check(info->mti_env);
5773 }
5774
5775 /**
5776  * Enable/disable COS (Commit On Sharing).
5777  *
5778  * Set/Clear the COS flag in mdt options.
5779  *
5780  * \param mdt mdt device
5781  * \param val 0 disables COS, other values enable COS
5782  */
5783 void mdt_enable_cos(struct mdt_device *mdt, int val)
5784 {
5785         struct lu_env env;
5786         int rc;
5787
5788         mdt->mdt_opts.mo_cos = !!val;
5789         rc = lu_env_init(&env, LCT_LOCAL);
5790         if (unlikely(rc != 0)) {
5791                 CWARN("%s: lu_env initialization failed, cannot "
5792                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
5793                 return;
5794         }
5795         mdt_device_sync(&env, mdt);
5796         lu_env_fini(&env);
5797 }
5798
5799 /**
5800  * Check COS (Commit On Sharing) status.
5801  *
5802  * Return COS flag status.
5803  *
5804  * \param mdt mdt device
5805  */
5806 int mdt_cos_is_enabled(struct mdt_device *mdt)
5807 {
5808         return mdt->mdt_opts.mo_cos != 0;
5809 }
5810
5811 static struct lu_device_type_operations mdt_device_type_ops = {
5812         .ldto_device_alloc = mdt_device_alloc,
5813         .ldto_device_free  = mdt_device_free,
5814         .ldto_device_fini  = mdt_device_fini
5815 };
5816
5817 static struct lu_device_type mdt_device_type = {
5818         .ldt_tags     = LU_DEVICE_MD,
5819         .ldt_name     = LUSTRE_MDT_NAME,
5820         .ldt_ops      = &mdt_device_type_ops,
5821         .ldt_ctx_tags = LCT_MD_THREAD
5822 };
5823
5824 static int __init mdt_mod_init(void)
5825 {
5826         int rc;
5827
5828         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5829                  FID_NOBRACE_LEN + 1);
5830         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5831                  FID_LEN + 1);
5832         rc = lu_kmem_init(mdt_caches);
5833         if (rc)
5834                 return rc;
5835
5836         rc = mds_mod_init();
5837         if (rc)
5838                 GOTO(lu_fini, rc);
5839
5840         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
5841                                  LUSTRE_MDT_NAME, &mdt_device_type);
5842         if (rc)
5843                 GOTO(mds_fini, rc);
5844 lu_fini:
5845         if (rc)
5846                 lu_kmem_fini(mdt_caches);
5847 mds_fini:
5848         if (rc)
5849                 mds_mod_exit();
5850         return rc;
5851 }
5852
5853 static void __exit mdt_mod_exit(void)
5854 {
5855         class_unregister_type(LUSTRE_MDT_NAME);
5856         mds_mod_exit();
5857         lu_kmem_fini(mdt_caches);
5858 }
5859
5860 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5861 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5862 MODULE_VERSION(LUSTRE_VERSION_STRING);
5863 MODULE_LICENSE("GPL");
5864
5865 module_init(mdt_mod_init);
5866 module_exit(mdt_mod_exit);