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, 2015, 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 #include <dt_object.h>
  54 #include <lustre_acl.h>
  55 #include <lustre_export.h>
  56 #include <lustre_ioctl.h>
  57 #include <lustre_lfsck.h>
  58 #include <lustre_log.h>
  59 #include <lustre_net.h>
  60 #include <lustre_nodemap.h>
  61 #include <lustre_mds.h>
  62 #include <lustre_param.h>
  63 #include <lustre_quota.h>
  64 #include <lustre_swab.h>
  65 #include <obd.h>
  66 #include <obd_support.h>
  67
  68 #include <llog_swab.h>
  69
  70 #include "mdt_internal.h"
  71
  72
  73 static unsigned int max_mod_rpcs_per_client = 8;
  74 module_param(max_mod_rpcs_per_client, uint, 0644);
  75 MODULE_PARM_DESC(max_mod_rpcs_per_client, "maximum number of modify RPCs in flight allowed per client");
  76
  77 mdl_mode_t mdt_mdl_lock_modes[] = {
  78         [LCK_MINMODE] = MDL_MINMODE,
  79         [LCK_EX]      = MDL_EX,
  80         [LCK_PW]      = MDL_PW,
  81         [LCK_PR]      = MDL_PR,
  82         [LCK_CW]      = MDL_CW,
  83         [LCK_CR]      = MDL_CR,
  84         [LCK_NL]      = MDL_NL,
  85         [LCK_GROUP]   = MDL_GROUP
  86 };
  87
  88 enum ldlm_mode mdt_dlm_lock_modes[] = {
  89         [MDL_MINMODE]   = LCK_MINMODE,
  90         [MDL_EX]        = LCK_EX,
  91         [MDL_PW]        = LCK_PW,
  92         [MDL_PR]        = LCK_PR,
  93         [MDL_CW]        = LCK_CW,
  94         [MDL_CR]        = LCK_CR,
  95         [MDL_NL]        = LCK_NL,
  96         [MDL_GROUP]     = LCK_GROUP
  97 };
  98
  99 static struct mdt_device *mdt_dev(struct lu_device *d);
 100 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
 101
 102 static const struct lu_object_operations mdt_obj_ops;
 103
 104 /* Slab for MDT object allocation */
 105 static struct kmem_cache *mdt_object_kmem;
 106
 107 /* For HSM restore handles */
 108 struct kmem_cache *mdt_hsm_cdt_kmem;
 109
 110 /* For HSM request handles */
 111 struct kmem_cache *mdt_hsm_car_kmem;
 112
 113 static struct lu_kmem_descr mdt_caches[] = {
 114         {
 115                 .ckd_cache = &mdt_object_kmem,
 116                 .ckd_name  = "mdt_obj",
 117                 .ckd_size  = sizeof(struct mdt_object)
 118         },
 119         {
 120                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 121                 .ckd_name       = "mdt_cdt_restore_handle",
 122                 .ckd_size       = sizeof(struct cdt_restore_handle)
 123         },
 124         {
 125                 .ckd_cache      = &mdt_hsm_car_kmem,
 126                 .ckd_name       = "mdt_cdt_agent_req",
 127                 .ckd_size       = sizeof(struct cdt_agent_req)
 128         },
 129         {
 130                 .ckd_cache = NULL
 131         }
 132 };
 133
 134 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 135 {
 136         if (!rep)
 137                 return 0;
 138         return rep->lock_policy_res1 & op_flag;
 139 }
 140
 141 void mdt_clear_disposition(struct mdt_thread_info *info,
 142                            struct ldlm_reply *rep, __u64 op_flag)
 143 {
 144         if (info) {
 145                 info->mti_opdata &= ~op_flag;
 146                 tgt_opdata_clear(info->mti_env, op_flag);
 147         }
 148         if (rep)
 149                 rep->lock_policy_res1 &= ~op_flag;
 150 }
 151
 152 void mdt_set_disposition(struct mdt_thread_info *info,
 153                          struct ldlm_reply *rep, __u64 op_flag)
 154 {
 155         if (info) {
 156                 info->mti_opdata |= op_flag;
 157                 tgt_opdata_set(info->mti_env, op_flag);
 158         }
 159         if (rep)
 160                 rep->lock_policy_res1 |= op_flag;
 161 }
 162
 163 void mdt_lock_reg_init(struct mdt_lock_handle *lh, enum ldlm_mode lm)
 164 {
 165         lh->mlh_pdo_hash = 0;
 166         lh->mlh_reg_mode = lm;
 167         lh->mlh_rreg_mode = lm;
 168         lh->mlh_type = MDT_REG_LOCK;
 169 }
 170
 171 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, enum ldlm_mode lock_mode,
 172                        const struct lu_name *lname)
 173 {
 174         lh->mlh_reg_mode = lock_mode;
 175         lh->mlh_pdo_mode = LCK_MINMODE;
 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_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 272                               struct lu_fid *fid)
 273 {
 274         struct mdt_device *mdt = info->mti_mdt;
 275         struct lu_name *lname = &info->mti_name;
 276         char *name = NULL;
 277         struct mdt_object *parent;
 278         u32 mode;
 279         int rc = 0;
 280
 281         LASSERT(!info->mti_cross_ref);
 282
 283         OBD_ALLOC(name, NAME_MAX + 1);
 284         if (name == NULL)
 285                 return -ENOMEM;
 286         lname->ln_name = name;
 287
 288         /*
 289          * We may want to allow this to mount a completely separate
 290          * fileset from the MDT in the future, but keeping it to
 291          * ROOT/ only for now avoid potential security issues.
 292          */
 293         *fid = mdt->mdt_md_root_fid;
 294
 295         while (rc == 0 && fileset != NULL && *fileset != '\0') {
 296                 const char *s1 = fileset;
 297                 const char *s2;
 298
 299                 while (*++s1 == '/')
 300                         ;
 301                 s2 = s1;
 302                 while (*s2 != '/' && *s2 != '\0')
 303                         s2++;
 304
 305                 if (s2 == s1)
 306                         break;
 307
 308                 fileset = s2;
 309
 310                 lname->ln_namelen = s2 - s1;
 311                 if (lname->ln_namelen > NAME_MAX) {
 312                         rc = -EINVAL;
 313                         break;
 314                 }
 315
 316                 /* reject .. as a path component */
 317                 if (lname->ln_namelen == 2 &&
 318                     strncmp(s1, "..", 2) == 0) {
 319                         rc = -EINVAL;
 320                         break;
 321                 }
 322
 323                 strncpy(name, s1, lname->ln_namelen);
 324                 name[lname->ln_namelen] = '\0';
 325
 326                 parent = mdt_object_find(info->mti_env, mdt, fid);
 327                 if (IS_ERR(parent)) {
 328                         rc = PTR_ERR(parent);
 329                         break;
 330                 }
 331                 /* Only got the fid of this obj by name */
 332                 fid_zero(fid);
 333                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
 334                                 fid, &info->mti_spec);
 335                 mdt_object_put(info->mti_env, parent);
 336         }
 337         if (!rc) {
 338                 parent = mdt_object_find(info->mti_env, mdt, fid);
 339                 if (IS_ERR(parent))
 340                         rc = PTR_ERR(parent);
 341                 else {
 342                         mode = lu_object_attr(&parent->mot_obj);
 343                         mdt_object_put(info->mti_env, parent);
 344                         if (!S_ISDIR(mode))
 345                                 rc = -ENOTDIR;
 346                 }
 347         }
 348
 349         OBD_FREE(name, NAME_MAX + 1);
 350
 351         return rc;
 352 }
 353
 354 static int mdt_get_root(struct tgt_session_info *tsi)
 355 {
 356         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 357         struct mdt_device       *mdt = info->mti_mdt;
 358         struct mdt_body         *repbody;
 359         char                    *fileset;
 360         int                      rc;
 361
 362         ENTRY;
 363
 364         rc = mdt_check_ucred(info);
 365         if (rc)
 366                 GOTO(out, rc = err_serious(rc));
 367
 368         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GET_ROOT_PACK))
 369                 GOTO(out, rc = err_serious(-ENOMEM));
 370
 371         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 372         if (req_capsule_get_size(info->mti_pill, &RMF_NAME, RCL_CLIENT) > 0) {
 373                 fileset = req_capsule_client_get(info->mti_pill, &RMF_NAME);
 374                 if (fileset == NULL)
 375                         GOTO(out, rc = err_serious(-EFAULT));
 376
 377                 rc = mdt_lookup_fileset(info, fileset, &repbody->mbo_fid1);
 378                 if (rc < 0)
 379                         GOTO(out, rc = err_serious(rc));
 380         } else {
 381                 repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 382         }
 383         repbody->mbo_valid |= OBD_MD_FLID;
 384
 385         EXIT;
 386 out:
 387         mdt_thread_info_fini(info);
 388         return rc;
 389 }
 390
 391 static int mdt_statfs(struct tgt_session_info *tsi)
 392 {
 393         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 394         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 395         struct md_device                *next = info->mti_mdt->mdt_child;
 396         struct ptlrpc_service_part      *svcpt;
 397         struct obd_statfs               *osfs;
 398         int                             rc;
 399
 400         ENTRY;
 401
 402         svcpt = req->rq_rqbd->rqbd_svcpt;
 403
 404         /* This will trigger a watchdog timeout */
 405         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 406                          (MDT_SERVICE_WATCHDOG_FACTOR *
 407                           at_get(&svcpt->scp_at_estimate)) + 1);
 408
 409         rc = mdt_check_ucred(info);
 410         if (rc)
 411                 GOTO(out, rc = err_serious(rc));
 412
 413         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 414                 GOTO(out, rc = err_serious(-ENOMEM));
 415
 416         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 417         if (!osfs)
 418                 GOTO(out, rc = -EPROTO);
 419
 420         /** statfs information are cached in the mdt_device */
 421         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 422                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 423                 /** statfs data is too old, get up-to-date one */
 424                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 425                 if (rc)
 426                         GOTO(out, rc);
 427                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 428                 info->mti_mdt->mdt_osfs = *osfs;
 429                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 430                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 431         } else {
 432                 /** use cached statfs data */
 433                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 434                 *osfs = info->mti_mdt->mdt_osfs;
 435                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 436         }
 437
 438         if (rc == 0)
 439                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 440 out:
 441         mdt_thread_info_fini(info);
 442         RETURN(rc);
 443 }
 444
 445 #ifdef CONFIG_FS_POSIX_ACL
 446 /*
 447  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 448  *
 449  * \param       info    thread info object
 450  * \param       repbody reply to pack ACLs into
 451  * \param       o       mdt object of file to examine
 452  * \param       nodemap nodemap of client to reply to
 453  * \retval      0       success
 454  * \retval      -errno  error getting or parsing ACL from disk
 455  */
 456 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 457                       struct mdt_object *o, struct lu_nodemap *nodemap)
 458 {
 459         const struct lu_env     *env = info->mti_env;
 460         struct md_object        *next = mdt_object_child(o);
 461         struct lu_buf           *buf = &info->mti_buf;
 462         int rc;
 463
 464         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 465         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 466                                            RCL_SERVER);
 467         if (buf->lb_len == 0)
 468                 return 0;
 469
 470         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 471         if (rc < 0) {
 472                 if (rc == -ENODATA) {
 473                         repbody->mbo_aclsize = 0;
 474                         repbody->mbo_valid |= OBD_MD_FLACL;
 475                         rc = 0;
 476                 } else if (rc == -EOPNOTSUPP) {
 477                         rc = 0;
 478                 } else {
 479                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 480                                mdt_obd_name(info->mti_mdt),
 481                                PFID(mdt_object_fid(o)), rc);
 482                 }
 483         } else {
 484                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 485                                      rc, NODEMAP_FS_TO_CLIENT);
 486                 /* if all ACLs mapped out, rc is still >= 0 */
 487                 if (rc < 0) {
 488                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 489                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
 490                                PFID(mdt_object_fid(o)), rc);
 491                 } else {
 492                         repbody->mbo_aclsize = rc;
 493                         repbody->mbo_valid |= OBD_MD_FLACL;
 494                         rc = 0;
 495                 }
 496         }
 497         return rc;
 498 }
 499 #endif
 500
 501 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 502                         const struct lu_attr *attr, const struct lu_fid *fid)
 503 {
 504         struct md_attr          *ma = &info->mti_attr;
 505         struct obd_export       *exp = info->mti_exp;
 506         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 507
 508         LASSERT(ma->ma_valid & MA_INODE);
 509
 510         if (attr->la_valid & LA_ATIME) {
 511                 b->mbo_atime = attr->la_atime;
 512                 b->mbo_valid |= OBD_MD_FLATIME;
 513         }
 514         if (attr->la_valid & LA_MTIME) {
 515                 b->mbo_mtime = attr->la_mtime;
 516                 b->mbo_valid |= OBD_MD_FLMTIME;
 517         }
 518         if (attr->la_valid & LA_CTIME) {
 519                 b->mbo_ctime = attr->la_ctime;
 520                 b->mbo_valid |= OBD_MD_FLCTIME;
 521         }
 522         if (attr->la_valid & LA_FLAGS) {
 523                 b->mbo_flags = attr->la_flags;
 524                 b->mbo_valid |= OBD_MD_FLFLAGS;
 525         }
 526         if (attr->la_valid & LA_NLINK) {
 527                 b->mbo_nlink = attr->la_nlink;
 528                 b->mbo_valid |= OBD_MD_FLNLINK;
 529         }
 530         if (attr->la_valid & LA_UID) {
 531                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 532                                             NODEMAP_FS_TO_CLIENT,
 533                                             attr->la_uid);
 534                 b->mbo_valid |= OBD_MD_FLUID;
 535         }
 536         if (attr->la_valid & LA_GID) {
 537                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 538                                             NODEMAP_FS_TO_CLIENT,
 539                                             attr->la_gid);
 540                 b->mbo_valid |= OBD_MD_FLGID;
 541         }
 542         b->mbo_mode = attr->la_mode;
 543         if (attr->la_valid & LA_MODE)
 544                 b->mbo_valid |= OBD_MD_FLMODE;
 545         if (attr->la_valid & LA_TYPE)
 546                 b->mbo_valid |= OBD_MD_FLTYPE;
 547
 548         if (fid != NULL) {
 549                 b->mbo_fid1 = *fid;
 550                 b->mbo_valid |= OBD_MD_FLID;
 551                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid="LPX64"\n",
 552                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 553         }
 554
 555         if (info != NULL)
 556                 mdt_body_reverse_idmap(info, b);
 557
 558         if (!(attr->la_valid & LA_TYPE))
 559                 return;
 560
 561         b->mbo_rdev   = attr->la_rdev;
 562         b->mbo_size   = attr->la_size;
 563         b->mbo_blocks = attr->la_blocks;
 564
 565         if (!S_ISREG(attr->la_mode)) {
 566                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 567         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 568                 /* means no objects are allocated on osts. */
 569                 LASSERT(!(ma->ma_valid & MA_LOV));
 570                 /* just ignore blocks occupied by extend attributes on MDS */
 571                 b->mbo_blocks = 0;
 572                 /* if no object is allocated on osts, the size on mds is valid.
 573                  * b=22272 */
 574                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 575         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 576                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 577                 /* A released file stores its size on MDS. */
 578                 /* But return 1 block for released file, unless tools like tar
 579                  * will consider it fully sparse. (LU-3864)
 580                  */
 581                 if (unlikely(b->mbo_size == 0))
 582                         b->mbo_blocks = 0;
 583                 else
 584                         b->mbo_blocks = 1;
 585                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 586         }
 587
 588         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 589                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 590                        PFID(fid), (unsigned long long)b->mbo_size);
 591 }
 592
 593 static inline int mdt_body_has_lov(const struct lu_attr *la,
 594                                    const struct mdt_body *body)
 595 {
 596         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 597                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 598 }
 599
 600 void mdt_client_compatibility(struct mdt_thread_info *info)
 601 {
 602         struct mdt_body       *body;
 603         struct ptlrpc_request *req = mdt_info_req(info);
 604         struct obd_export     *exp = req->rq_export;
 605         struct md_attr        *ma = &info->mti_attr;
 606         struct lu_attr        *la = &ma->ma_attr;
 607         ENTRY;
 608
 609         if (exp_connect_layout(exp))
 610                 /* the client can deal with 16-bit lmm_stripe_count */
 611                 RETURN_EXIT;
 612
 613         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 614
 615         if (!mdt_body_has_lov(la, body))
 616                 RETURN_EXIT;
 617
 618         /* now we have a reply with a lov for a client not compatible with the
 619          * layout lock so we have to clean the layout generation number */
 620         if (S_ISREG(la->la_mode))
 621                 ma->ma_lmm->lmm_layout_gen = 0;
 622         EXIT;
 623 }
 624
 625 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 626                                    struct mdt_object *o)
 627 {
 628         const struct lu_env *env = info->mti_env;
 629         int rc, rc2;
 630
 631         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 632                           XATTR_NAME_LOV);
 633
 634         if (rc == -ENODATA)
 635                 rc = 0;
 636
 637         if (rc < 0)
 638                 goto out;
 639
 640         /* Is it a directory? Let's check for the LMV as well */
 641         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 642                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 643                                    XATTR_NAME_LMV);
 644
 645                 if (rc2 == -ENODATA)
 646                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 647                                            &LU_BUF_NULL,
 648                                            XATTR_NAME_DEFAULT_LMV);
 649
 650                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 651                         rc = rc2;
 652         }
 653
 654 out:
 655         return rc;
 656 }
 657
 658 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 659                       const char *name)
 660 {
 661         const struct lu_env *env = info->mti_env;
 662         int rc;
 663         ENTRY;
 664
 665         LASSERT(info->mti_big_lmm_used == 0);
 666         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 667         if (rc < 0)
 668                 RETURN(rc);
 669
 670         /* big_lmm may need to be grown */
 671         if (info->mti_big_lmmsize < rc) {
 672                 int size = size_roundup_power2(rc);
 673
 674                 if (info->mti_big_lmmsize > 0) {
 675                         /* free old buffer */
 676                         LASSERT(info->mti_big_lmm);
 677                         OBD_FREE_LARGE(info->mti_big_lmm,
 678                                        info->mti_big_lmmsize);
 679                         info->mti_big_lmm = NULL;
 680                         info->mti_big_lmmsize = 0;
 681                 }
 682
 683                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 684                 if (info->mti_big_lmm == NULL)
 685                         RETURN(-ENOMEM);
 686                 info->mti_big_lmmsize = size;
 687         }
 688         LASSERT(info->mti_big_lmmsize >= rc);
 689
 690         info->mti_buf.lb_buf = info->mti_big_lmm;
 691         info->mti_buf.lb_len = info->mti_big_lmmsize;
 692         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 693
 694         RETURN(rc);
 695 }
 696
 697 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 698                    struct md_attr *ma, const char *name)
 699 {
 700         struct md_object *next = mdt_object_child(o);
 701         struct lu_buf    *buf = &info->mti_buf;
 702         int rc;
 703
 704         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 705                 buf->lb_buf = ma->ma_lmm;
 706                 buf->lb_len = ma->ma_lmm_size;
 707                 LASSERT(!(ma->ma_valid & MA_LOV));
 708         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 709                 buf->lb_buf = ma->ma_lmv;
 710                 buf->lb_len = ma->ma_lmv_size;
 711                 LASSERT(!(ma->ma_valid & MA_LMV));
 712         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 713                 buf->lb_buf = ma->ma_lmv;
 714                 buf->lb_len = ma->ma_lmv_size;
 715                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 716         } else {
 717                 return -EINVAL;
 718         }
 719
 720         rc = mo_xattr_get(info->mti_env, next, buf, name);
 721         if (rc > 0) {
 722
 723 got:
 724                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 725                         if (info->mti_big_lmm_used)
 726                                 ma->ma_lmm = info->mti_big_lmm;
 727
 728                         /* NOT return LOV EA with hole to old client. */
 729                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 730                                      LOV_PATTERN_F_HOLE) &&
 731                             !(exp_connect_flags(info->mti_exp) &
 732                               OBD_CONNECT_LFSCK)) {
 733                                 return -EIO;
 734                         } else {
 735                                 ma->ma_lmm_size = rc;
 736                                 ma->ma_valid |= MA_LOV;
 737                         }
 738                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 739                         if (info->mti_big_lmm_used)
 740                                 ma->ma_lmv = info->mti_big_lmm;
 741
 742                         ma->ma_lmv_size = rc;
 743                         ma->ma_valid |= MA_LMV;
 744                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 745                         ma->ma_lmv_size = rc;
 746                         ma->ma_valid |= MA_LMV_DEF;
 747                 }
 748
 749                 /* Update mdt_max_mdsize so all clients will be aware that */
 750                 if (info->mti_mdt->mdt_max_mdsize < rc)
 751                         info->mti_mdt->mdt_max_mdsize = rc;
 752
 753                 rc = 0;
 754         } else if (rc == -ENODATA) {
 755                 /* no LOV EA */
 756                 rc = 0;
 757         } else if (rc == -ERANGE) {
 758                 /* Default LMV has fixed size, so it must be able to fit
 759                  * in the original buffer */
 760                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 761                         return rc;
 762                 rc = mdt_big_xattr_get(info, o, name);
 763                 if (rc > 0) {
 764                         info->mti_big_lmm_used = 1;
 765                         goto got;
 766                 }
 767         }
 768
 769         return rc;
 770 }
 771
 772 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 773                              struct mdt_object *o, struct lu_fid *pfid)
 774 {
 775         struct lu_buf           *buf = &info->mti_buf;
 776         struct link_ea_header   *leh;
 777         struct link_ea_entry    *lee;
 778         int                      rc;
 779         ENTRY;
 780
 781         buf->lb_buf = info->mti_big_lmm;
 782         buf->lb_len = info->mti_big_lmmsize;
 783         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 784                           buf, XATTR_NAME_LINK);
 785         /* ignore errors, MA_PFID won't be set and it is
 786          * up to the caller to treat this as an error */
 787         if (rc == -ERANGE || buf->lb_len == 0) {
 788                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 789                 buf->lb_buf = info->mti_big_lmm;
 790                 buf->lb_len = info->mti_big_lmmsize;
 791         }
 792
 793         if (rc < 0)
 794                 RETURN(rc);
 795         if (rc < sizeof(*leh)) {
 796                 CERROR("short LinkEA on "DFID": rc = %d\n",
 797                        PFID(mdt_object_fid(o)), rc);
 798                 RETURN(-ENODATA);
 799         }
 800
 801         leh = (struct link_ea_header *) buf->lb_buf;
 802         lee = (struct link_ea_entry *)(leh + 1);
 803         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 804                 leh->leh_magic = LINK_EA_MAGIC;
 805                 leh->leh_reccount = __swab32(leh->leh_reccount);
 806                 leh->leh_len = __swab64(leh->leh_len);
 807         }
 808         if (leh->leh_magic != LINK_EA_MAGIC)
 809                 RETURN(-EINVAL);
 810         if (leh->leh_reccount == 0)
 811                 RETURN(-ENODATA);
 812
 813         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 814         fid_be_to_cpu(pfid, pfid);
 815
 816         RETURN(0);
 817 }
 818
 819 int mdt_attr_get_complex(struct mdt_thread_info *info,
 820                          struct mdt_object *o, struct md_attr *ma)
 821 {
 822         const struct lu_env *env = info->mti_env;
 823         struct md_object    *next = mdt_object_child(o);
 824         struct lu_buf       *buf = &info->mti_buf;
 825         int                  need = ma->ma_need;
 826         int                  rc = 0, rc2;
 827         u32                  mode;
 828         ENTRY;
 829
 830         ma->ma_valid = 0;
 831
 832         if (mdt_object_exists(o) == 0)
 833                 GOTO(out, rc = -ENOENT);
 834         mode = lu_object_attr(&next->mo_lu);
 835
 836         if (need & MA_INODE) {
 837                 ma->ma_need = MA_INODE;
 838                 rc = mo_attr_get(env, next, ma);
 839                 if (rc)
 840                         GOTO(out, rc);
 841                 ma->ma_valid |= MA_INODE;
 842         }
 843
 844         if (need & MA_PFID) {
 845                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 846                 if (rc == 0)
 847                         ma->ma_valid |= MA_PFID;
 848                 /* ignore this error, parent fid is not mandatory */
 849                 rc = 0;
 850         }
 851
 852         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 853                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 854                 if (rc)
 855                         GOTO(out, rc);
 856         }
 857
 858         if (need & MA_LMV && S_ISDIR(mode)) {
 859                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 860                 if (rc != 0)
 861                         GOTO(out, rc);
 862         }
 863
 864         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 865                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 866                 if (rc != 0)
 867                         GOTO(out, rc);
 868         }
 869
 870         if (need & MA_HSM && S_ISREG(mode)) {
 871                 buf->lb_buf = info->mti_xattr_buf;
 872                 buf->lb_len = sizeof(info->mti_xattr_buf);
 873                 CLASSERT(sizeof(struct hsm_attrs) <=
 874                          sizeof(info->mti_xattr_buf));
 875                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 876                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 877                 if (rc2 == 0)
 878                         ma->ma_valid |= MA_HSM;
 879                 else if (rc2 < 0 && rc2 != -ENODATA)
 880                         GOTO(out, rc = rc2);
 881         }
 882
 883 #ifdef CONFIG_FS_POSIX_ACL
 884         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 885                 buf->lb_buf = ma->ma_acl;
 886                 buf->lb_len = ma->ma_acl_size;
 887                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 888                 if (rc2 > 0) {
 889                         ma->ma_acl_size = rc2;
 890                         ma->ma_valid |= MA_ACL_DEF;
 891                 } else if (rc2 == -ENODATA) {
 892                         /* no ACLs */
 893                         ma->ma_acl_size = 0;
 894                 } else
 895                         GOTO(out, rc = rc2);
 896         }
 897 #endif
 898 out:
 899         ma->ma_need = need;
 900         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 901                rc, ma->ma_valid, ma->ma_lmm);
 902         RETURN(rc);
 903 }
 904
 905 static int mdt_getattr_internal(struct mdt_thread_info *info,
 906                                 struct mdt_object *o, int ma_need)
 907 {
 908         struct md_object        *next = mdt_object_child(o);
 909         const struct mdt_body   *reqbody = info->mti_body;
 910         struct ptlrpc_request   *req = mdt_info_req(info);
 911         struct md_attr          *ma = &info->mti_attr;
 912         struct lu_attr          *la = &ma->ma_attr;
 913         struct req_capsule      *pill = info->mti_pill;
 914         const struct lu_env     *env = info->mti_env;
 915         struct mdt_body         *repbody;
 916         struct lu_buf           *buffer = &info->mti_buf;
 917         struct obd_export       *exp = info->mti_exp;
 918         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 919         int                      rc;
 920         int                      is_root;
 921         ENTRY;
 922
 923         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 924                 RETURN(err_serious(-ENOMEM));
 925
 926         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 927
 928         ma->ma_valid = 0;
 929
 930         if (mdt_object_remote(o)) {
 931                 /* This object is located on remote node.*/
 932                 /* Return -ENOTSUPP for old client */
 933                 if (!mdt_is_dne_client(req->rq_export))
 934                         GOTO(out, rc = -ENOTSUPP);
 935
 936                 repbody->mbo_fid1 = *mdt_object_fid(o);
 937                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
 938                 GOTO(out, rc = 0);
 939         }
 940
 941         if (reqbody->mbo_eadatasize > 0) {
 942                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 943                 if (buffer->lb_buf == NULL)
 944                         GOTO(out, rc = -EPROTO);
 945                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
 946                                                       RCL_SERVER);
 947         } else {
 948                 buffer->lb_buf = NULL;
 949                 buffer->lb_len = 0;
 950                 ma_need &= ~(MA_LOV | MA_LMV);
 951                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 952                        mdt_obd_name(info->mti_mdt),
 953                        req->rq_export->exp_client_uuid.uuid);
 954         }
 955
 956         /* If it is dir object and client require MEA, then we got MEA */
 957         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 958             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 959                 /* Assumption: MDT_MD size is enough for lmv size. */
 960                 ma->ma_lmv = buffer->lb_buf;
 961                 ma->ma_lmv_size = buffer->lb_len;
 962                 ma->ma_need = MA_INODE;
 963                 if (ma->ma_lmv_size > 0) {
 964                         if (reqbody->mbo_valid & OBD_MD_MEA)
 965                                 ma->ma_need |= MA_LMV;
 966                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
 967                                 ma->ma_need |= MA_LMV_DEF;
 968                 }
 969         } else {
 970                 ma->ma_lmm = buffer->lb_buf;
 971                 ma->ma_lmm_size = buffer->lb_len;
 972                 ma->ma_need = MA_INODE | MA_HSM;
 973                 if (ma->ma_lmm_size > 0)
 974                         ma->ma_need |= MA_LOV;
 975         }
 976
 977         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 978             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
 979             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 980                 /* get default stripe info for this dir. */
 981                 ma->ma_need |= MA_LOV_DEF;
 982         }
 983         ma->ma_need |= ma_need;
 984
 985         rc = mdt_attr_get_complex(info, o, ma);
 986         if (unlikely(rc)) {
 987                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 988                        mdt_obd_name(info->mti_mdt),
 989                        PFID(mdt_object_fid(o)), rc);
 990                 RETURN(rc);
 991         }
 992
 993         /* if file is released, check if a restore is running */
 994         if (ma->ma_valid & MA_HSM) {
 995                 repbody->mbo_valid |= OBD_MD_TSTATE;
 996                 if ((ma->ma_hsm.mh_flags & HS_RELEASED) &&
 997                     mdt_hsm_restore_is_running(info, mdt_object_fid(o)))
 998                         repbody->mbo_t_state = MS_RESTORE;
 999         }
1000
1001         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
1002
1003         /* the Lustre protocol supposes to return default striping
1004          * on the user-visible root if explicitly requested */
1005         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
1006             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
1007                 struct lu_fid      rootfid;
1008                 struct mdt_object *root;
1009                 struct mdt_device *mdt = info->mti_mdt;
1010
1011                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
1012                 if (rc)
1013                         RETURN(rc);
1014                 root = mdt_object_find(env, mdt, &rootfid);
1015                 if (IS_ERR(root))
1016                         RETURN(PTR_ERR(root));
1017                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
1018                 mdt_object_put(info->mti_env, root);
1019                 if (unlikely(rc)) {
1020                         CERROR("%s: getattr error for "DFID": rc = %d\n",
1021                                mdt_obd_name(info->mti_mdt),
1022                                PFID(mdt_object_fid(o)), rc);
1023                         RETURN(rc);
1024                 }
1025         }
1026
1027         if (likely(ma->ma_valid & MA_INODE))
1028                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
1029         else
1030                 RETURN(-EFAULT);
1031
1032         if (mdt_body_has_lov(la, reqbody)) {
1033                 if (ma->ma_valid & MA_LOV) {
1034                         LASSERT(ma->ma_lmm_size);
1035                         repbody->mbo_eadatasize = ma->ma_lmm_size;
1036                         if (S_ISDIR(la->la_mode))
1037                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
1038                         else
1039                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
1040                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
1041                 }
1042                 if (ma->ma_valid & MA_LMV) {
1043                         /* Return -ENOTSUPP for old client */
1044                         if (!mdt_is_striped_client(req->rq_export))
1045                                 RETURN(-ENOTSUPP);
1046
1047                         LASSERT(S_ISDIR(la->la_mode));
1048                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
1049                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1050                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
1051                 }
1052                 if (ma->ma_valid & MA_LMV_DEF) {
1053                         /* Return -ENOTSUPP for old client */
1054                         if (!mdt_is_striped_client(req->rq_export))
1055                                 RETURN(-ENOTSUPP);
1056                         LASSERT(S_ISDIR(la->la_mode));
1057                         repbody->mbo_eadatasize = ma->ma_lmv_size;
1058                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
1059                                                OBD_MD_DEFAULT_MEA);
1060                 }
1061         } else if (S_ISLNK(la->la_mode) &&
1062                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
1063                 buffer->lb_buf = ma->ma_lmm;
1064                 /* eadatasize from client includes NULL-terminator, so
1065                  * there is no need to read it */
1066                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
1067                 rc = mo_readlink(env, next, buffer);
1068                 if (unlikely(rc <= 0)) {
1069                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
1070                                mdt_obd_name(info->mti_mdt),
1071                                PFID(mdt_object_fid(o)), rc);
1072                         rc = -EFAULT;
1073                 } else {
1074                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
1075
1076                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
1077                                 rc -= 2;
1078                         repbody->mbo_valid |= OBD_MD_LINKNAME;
1079                         /* we need to report back size with NULL-terminator
1080                          * because client expects that */
1081                         repbody->mbo_eadatasize = rc + 1;
1082                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1083                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1084                                        "on "DFID ", expected %d\n",
1085                                        mdt_obd_name(info->mti_mdt),
1086                                        rc, PFID(mdt_object_fid(o)),
1087                                        reqbody->mbo_eadatasize - 1);
1088                         /* NULL terminate */
1089                         ((char *)ma->ma_lmm)[rc] = 0;
1090
1091                         /* If the total CDEBUG() size is larger than a page, it
1092                          * will print a warning to the console, avoid this by
1093                          * printing just the last part of the symlink. */
1094                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1095                                print_limit < rc ? "..." : "", print_limit,
1096                                (char *)ma->ma_lmm + rc - print_limit, rc);
1097                         rc = 0;
1098                 }
1099         }
1100
1101         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1102                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1103                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1104                 CDEBUG(D_INODE, "changing the max MD size to %u\n",
1105                        repbody->mbo_max_mdsize);
1106         }
1107
1108         if (exp_connect_rmtclient(info->mti_exp) &&
1109             reqbody->mbo_valid & OBD_MD_FLRMTPERM) {
1110                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
1111
1112                 /* mdt_getattr_lock only */
1113                 rc = mdt_pack_remote_perm(info, o, buf);
1114                 if (rc) {
1115                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
1116                         repbody->mbo_aclsize = 0;
1117                         RETURN(rc);
1118                 } else {
1119                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
1120                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
1121                 }
1122         }
1123 #ifdef CONFIG_FS_POSIX_ACL
1124         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1125                  (reqbody->mbo_valid & OBD_MD_FLACL))
1126                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1127 #endif
1128
1129 out:
1130         if (rc == 0)
1131                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1132
1133         RETURN(rc);
1134 }
1135
1136 static int mdt_getattr(struct tgt_session_info *tsi)
1137 {
1138         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1139         struct mdt_object       *obj = info->mti_object;
1140         struct req_capsule      *pill = info->mti_pill;
1141         struct mdt_body         *reqbody;
1142         struct mdt_body         *repbody;
1143         int rc, rc2;
1144         ENTRY;
1145
1146         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1147         LASSERT(reqbody);
1148         LASSERT(obj != NULL);
1149         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1150
1151         /* Unlike intent case where we need to pre-fill out buffers early on
1152          * in intent policy for ldlm reasons, here we can have a much better
1153          * guess at EA size by just reading it from disk.
1154          * Exceptions are readdir and (missing) directory striping */
1155         /* Readlink */
1156         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1157                 /* No easy way to know how long is the symlink, but it cannot
1158                  * be more than PATH_MAX, so we allocate +1 */
1159                 rc = PATH_MAX + 1;
1160
1161         /* A special case for fs ROOT: getattr there might fetch
1162          * default EA for entire fs, not just for this dir!
1163          */
1164         } else if (lu_fid_eq(mdt_object_fid(obj),
1165                              &info->mti_mdt->mdt_md_root_fid) &&
1166                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1167                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1168                                                                  MDS_GETATTR)) {
1169                 /* Should the default strping be bigger, mdt_fix_reply
1170                  * will reallocate */
1171                 rc = DEF_REP_MD_SIZE;
1172         } else {
1173                 /* Read the actual EA size from disk */
1174                 rc = mdt_attr_get_eabuf_size(info, obj);
1175         }
1176
1177         if (rc < 0)
1178                 GOTO(out, rc = err_serious(rc));
1179
1180         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1181
1182         rc = req_capsule_server_pack(pill);
1183         if (unlikely(rc != 0))
1184                 GOTO(out, rc = err_serious(rc));
1185
1186         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1187         LASSERT(repbody != NULL);
1188         repbody->mbo_eadatasize = 0;
1189         repbody->mbo_aclsize = 0;
1190
1191         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1192                 rc = mdt_init_ucred(info, reqbody);
1193         else
1194                 rc = mdt_check_ucred(info);
1195         if (unlikely(rc))
1196                 GOTO(out_shrink, rc);
1197
1198         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1199
1200         rc = mdt_getattr_internal(info, obj, 0);
1201         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1202                 mdt_exit_ucred(info);
1203         EXIT;
1204 out_shrink:
1205         mdt_client_compatibility(info);
1206         rc2 = mdt_fix_reply(info);
1207         if (rc == 0)
1208                 rc = rc2;
1209 out:
1210         mdt_thread_info_fini(info);
1211         return rc;
1212 }
1213
1214 /**
1215  * Exchange MOF_LOV_CREATED flags between two objects after a
1216  * layout swap. No assumption is made on whether o1 or o2 have
1217  * created objects or not.
1218  *
1219  * \param[in,out] o1    First swap layout object
1220  * \param[in,out] o2    Second swap layout object
1221  */
1222 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1223 {
1224         __u64   o1_flags;
1225
1226         mutex_lock(&o1->mot_lov_mutex);
1227         mutex_lock(&o2->mot_lov_mutex);
1228
1229         o1_flags = o1->mot_flags;
1230         o1->mot_flags = (o1->mot_flags & ~MOF_LOV_CREATED) |
1231                         (o2->mot_flags & MOF_LOV_CREATED);
1232
1233         o2->mot_flags = (o2->mot_flags & ~MOF_LOV_CREATED) |
1234                         (o1_flags & MOF_LOV_CREATED);
1235
1236         mutex_unlock(&o2->mot_lov_mutex);
1237         mutex_unlock(&o1->mot_lov_mutex);
1238 }
1239
1240 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1241 {
1242         struct mdt_thread_info  *info;
1243         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1244         struct obd_export       *exp = req->rq_export;
1245         struct mdt_object       *o1, *o2, *o;
1246         struct mdt_lock_handle  *lh1, *lh2;
1247         struct mdc_swap_layouts *msl;
1248         int                      rc;
1249         ENTRY;
1250
1251         /* client does not support layout lock, so layout swaping
1252          * is disabled.
1253          * FIXME: there is a problem for old clients which don't support
1254          * layout lock yet. If those clients have already opened the file
1255          * they won't be notified at all so that old layout may still be
1256          * used to do IO. This can be fixed after file release is landed by
1257          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1258         if (!exp_connect_layout(exp))
1259                 RETURN(-EOPNOTSUPP);
1260
1261         info = tsi2mdt_info(tsi);
1262
1263         if (info->mti_dlm_req != NULL)
1264                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1265
1266         o1 = info->mti_object;
1267         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1268                                 &info->mti_body->mbo_fid2);
1269         if (IS_ERR(o))
1270                 GOTO(out, rc = PTR_ERR(o));
1271
1272         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1273                 GOTO(put, rc = -ENOENT);
1274
1275         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1276         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1277                 GOTO(put, rc);
1278
1279         if (rc < 0)
1280                 swap(o1, o2);
1281
1282         /* permission check. Make sure the calling process having permission
1283          * to write both files. */
1284         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1285                                 MAY_WRITE);
1286         if (rc < 0)
1287                 GOTO(put, rc);
1288
1289         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1290                                 MAY_WRITE);
1291         if (rc < 0)
1292                 GOTO(put, rc);
1293
1294         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1295         if (msl == NULL)
1296                 GOTO(put, rc = -EPROTO);
1297
1298         lh1 = &info->mti_lh[MDT_LH_NEW];
1299         mdt_lock_reg_init(lh1, LCK_EX);
1300         lh2 = &info->mti_lh[MDT_LH_OLD];
1301         mdt_lock_reg_init(lh2, LCK_EX);
1302
1303         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1304                              MDS_INODELOCK_XATTR);
1305         if (rc < 0)
1306                 GOTO(put, rc);
1307
1308         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1309                              MDS_INODELOCK_XATTR);
1310         if (rc < 0)
1311                 GOTO(unlock1, rc);
1312
1313         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1314                              mdt_object_child(o2), msl->msl_flags);
1315         if (rc < 0)
1316                 GOTO(unlock2, rc);
1317
1318         mdt_swap_lov_flag(o1, o2);
1319
1320 unlock2:
1321         mdt_object_unlock(info, o2, lh2, rc);
1322 unlock1:
1323         mdt_object_unlock(info, o1, lh1, rc);
1324 put:
1325         mdt_object_put(info->mti_env, o);
1326 out:
1327         mdt_thread_info_fini(info);
1328         RETURN(rc);
1329 }
1330
1331 static int mdt_raw_lookup(struct mdt_thread_info *info,
1332                           struct mdt_object *parent,
1333                           const struct lu_name *lname,
1334                           struct ldlm_reply *ldlm_rep)
1335 {
1336         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1337         int              rc;
1338         ENTRY;
1339
1340         LASSERT(!info->mti_cross_ref);
1341
1342         /* Only got the fid of this obj by name */
1343         fid_zero(child_fid);
1344         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1345                         lname, child_fid, &info->mti_spec);
1346         if (rc == 0) {
1347                 struct mdt_body *repbody;
1348
1349                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1350                 repbody->mbo_fid1 = *child_fid;
1351                 repbody->mbo_valid = OBD_MD_FLID;
1352                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1353         } else if (rc == -ENOENT) {
1354                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1355         }
1356
1357         RETURN(rc);
1358 }
1359
1360 /*
1361  * UPDATE lock should be taken against parent, and be released before exit;
1362  * child_bits lock should be taken against child, and be returned back:
1363  *            (1)normal request should release the child lock;
1364  *            (2)intent request will grant the lock to client.
1365  */
1366 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1367                                  struct mdt_lock_handle *lhc,
1368                                  __u64 child_bits,
1369                                  struct ldlm_reply *ldlm_rep)
1370 {
1371         struct ptlrpc_request  *req       = mdt_info_req(info);
1372         struct mdt_body        *reqbody   = NULL;
1373         struct mdt_object      *parent    = info->mti_object;
1374         struct mdt_object      *child;
1375         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1376         struct lu_name         *lname     = NULL;
1377         struct mdt_lock_handle *lhp       = NULL;
1378         struct ldlm_lock       *lock;
1379         bool                    is_resent;
1380         bool                    try_layout;
1381         int                     ma_need = 0;
1382         int                     rc;
1383         ENTRY;
1384
1385         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1386         LASSERT(ergo(is_resent,
1387                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1388
1389         if (parent == NULL)
1390                 RETURN(-ENOENT);
1391
1392         if (info->mti_cross_ref) {
1393                 /* Only getattr on the child. Parent is on another node. */
1394                 mdt_set_disposition(info, ldlm_rep,
1395                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1396                 child = parent;
1397                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1398                        "ldlm_rep = %p\n",
1399                        PFID(mdt_object_fid(child)), ldlm_rep);
1400
1401                 rc = mdt_check_resent_lock(info, child, lhc);
1402                 if (rc < 0) {
1403                         RETURN(rc);
1404                 } else if (rc > 0) {
1405                         mdt_lock_handle_init(lhc);
1406                         mdt_lock_reg_init(lhc, LCK_PR);
1407
1408                         /*
1409                          * Object's name is on another MDS, no lookup or layout
1410                          * lock is needed here but update lock is.
1411                          */
1412                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1413                                         MDS_INODELOCK_LAYOUT);
1414                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1415
1416                         rc = mdt_object_lock(info, child, lhc, child_bits);
1417                         if (rc < 0)
1418                                 RETURN(rc);
1419                 }
1420
1421                 /* Finally, we can get attr for child. */
1422                 if (!mdt_object_exists(child)) {
1423                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1424                                         &child->mot_obj,
1425                                         "remote object doesn't exist.\n");
1426                         mdt_object_unlock(info, child, lhc, 1);
1427                         RETURN(-ENOENT);
1428                 }
1429
1430                 rc = mdt_getattr_internal(info, child, 0);
1431                 if (unlikely(rc != 0))
1432                         mdt_object_unlock(info, child, lhc, 1);
1433
1434                 RETURN(rc);
1435         }
1436
1437         lname = &info->mti_name;
1438         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1439
1440         if (lu_name_is_valid(lname)) {
1441                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1442                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1443                        PNAME(lname), ldlm_rep);
1444         } else {
1445                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1446                 if (unlikely(reqbody == NULL))
1447                         RETURN(err_serious(-EPROTO));
1448
1449                 *child_fid = reqbody->mbo_fid2;
1450
1451                 if (unlikely(!fid_is_sane(child_fid)))
1452                         RETURN(err_serious(-EINVAL));
1453
1454                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1455                        "ldlm_rep = %p\n",
1456                        PFID(mdt_object_fid(parent)),
1457                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1458         }
1459
1460         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1461
1462         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1463                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1464                                 &parent->mot_obj,
1465                                 "Parent doesn't exist!\n");
1466                 RETURN(-ESTALE);
1467         }
1468
1469         if (mdt_object_remote(parent)) {
1470                 CERROR("%s: parent "DFID" is on remote target\n",
1471                        mdt_obd_name(info->mti_mdt),
1472                        PFID(mdt_object_fid(parent)));
1473                 RETURN(-EIO);
1474         }
1475
1476         if (lu_name_is_valid(lname)) {
1477                 /* Always allow to lookup ".." */
1478                 if (unlikely(lname->ln_namelen == 2 &&
1479                              lname->ln_name[0] == '.' &&
1480                              lname->ln_name[1] == '.'))
1481                         info->mti_spec.sp_permitted = 1;
1482
1483                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1484                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1485
1486                         RETURN(rc);
1487                 }
1488
1489                 /* step 1: lock parent only if parent is a directory */
1490                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1491                         lhp = &info->mti_lh[MDT_LH_PARENT];
1492                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1493                         rc = mdt_object_lock(info, parent, lhp,
1494                                              MDS_INODELOCK_UPDATE);
1495                         if (unlikely(rc != 0))
1496                                 RETURN(rc);
1497                 }
1498
1499                 /* step 2: lookup child's fid by name */
1500                 fid_zero(child_fid);
1501                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1502                                 child_fid, &info->mti_spec);
1503                 if (rc == -ENOENT)
1504                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1505
1506                 if (rc != 0)
1507                         GOTO(out_parent, rc);
1508         }
1509
1510         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1511
1512         /*
1513          *step 3: find the child object by fid & lock it.
1514          *        regardless if it is local or remote.
1515          *
1516          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1517          *      set parent dir fid the same as child fid in getattr by fid case
1518          *      we should not lu_object_find() the object again, could lead
1519          *      to hung if there is a concurrent unlink destroyed the object.
1520          */
1521         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1522                 mdt_object_get(info->mti_env, parent);
1523                 child = parent;
1524         } else {
1525                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1526                                         child_fid);
1527         }
1528
1529         if (unlikely(IS_ERR(child)))
1530                 GOTO(out_parent, rc = PTR_ERR(child));
1531
1532         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1533         if (!mdt_object_exists(child)) {
1534                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1535                                 &child->mot_obj,
1536                                 "Object doesn't exist!\n");
1537                 GOTO(out_child, rc = -ENOENT);
1538         }
1539
1540         rc = mdt_check_resent_lock(info, child, lhc);
1541         if (rc < 0) {
1542                 GOTO(out_child, rc);
1543         } else if (rc > 0) {
1544                 mdt_lock_handle_init(lhc);
1545                 mdt_lock_reg_init(lhc, LCK_PR);
1546                 try_layout = false;
1547
1548                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1549                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1550                         struct md_attr *ma = &info->mti_attr;
1551
1552                         ma->ma_valid = 0;
1553                         ma->ma_need = MA_INODE;
1554                         rc = mdt_attr_get_complex(info, child, ma);
1555                         if (unlikely(rc != 0))
1556                                 GOTO(out_child, rc);
1557
1558                         /* If the file has not been changed for some time, we
1559                          * return not only a LOOKUP lock, but also an UPDATE
1560                          * lock and this might save us RPC on later STAT. For
1561                          * directories, it also let negative dentry cache start
1562                          * working for this dir. */
1563                         if (ma->ma_valid & MA_INODE &&
1564                             ma->ma_attr.la_valid & LA_CTIME &&
1565                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1566                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1567                                 child_bits |= MDS_INODELOCK_UPDATE;
1568                 }
1569
1570                 /* layout lock must be granted in a best-effort way
1571                  * for IT operations */
1572                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1573                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1574                     exp_connect_layout(info->mti_exp) &&
1575                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1576                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1577                         /* try to grant layout lock for regular file. */
1578                         try_layout = true;
1579                 }
1580
1581                 rc = 0;
1582                 if (try_layout) {
1583                         child_bits |= MDS_INODELOCK_LAYOUT;
1584                         /* try layout lock, it may fail to be granted due to
1585                          * contention at LOOKUP or UPDATE */
1586                         if (!mdt_object_lock_try(info, child, lhc,
1587                                                  child_bits)) {
1588                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1589                                 LASSERT(child_bits != 0);
1590                                 rc = mdt_object_lock(info, child, lhc,
1591                                                      child_bits);
1592                         } else {
1593                                 ma_need |= MA_LOV;
1594                         }
1595                 } else {
1596                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1597                          * client will enqueue the lock to the remote MDT */
1598                         if (mdt_object_remote(child))
1599                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1600                         rc = mdt_object_lock(info, child, lhc, child_bits);
1601                 }
1602                 if (unlikely(rc != 0))
1603                         GOTO(out_child, rc);
1604         }
1605
1606         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1607
1608         /* finally, we can get attr for child. */
1609         rc = mdt_getattr_internal(info, child, ma_need);
1610         if (unlikely(rc != 0)) {
1611                 mdt_object_unlock(info, child, lhc, 1);
1612         } else if (lock) {
1613                 /* Debugging code. */
1614                 LDLM_DEBUG(lock, "Returning lock to client");
1615                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1616                                          &lock->l_resource->lr_name),
1617                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1618                          PLDLMRES(lock->l_resource),
1619                          PFID(mdt_object_fid(child)));
1620         }
1621         if (lock)
1622                 LDLM_LOCK_PUT(lock);
1623
1624         EXIT;
1625 out_child:
1626         mdt_object_put(info->mti_env, child);
1627 out_parent:
1628         if (lhp)
1629                 mdt_object_unlock(info, parent, lhp, 1);
1630         return rc;
1631 }
1632
1633 /* normal handler: should release the child lock */
1634 static int mdt_getattr_name(struct tgt_session_info *tsi)
1635 {
1636         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1637         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1638         struct mdt_body        *reqbody;
1639         struct mdt_body        *repbody;
1640         int rc, rc2;
1641         ENTRY;
1642
1643         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1644         LASSERT(reqbody != NULL);
1645         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1646         LASSERT(repbody != NULL);
1647
1648         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1649         repbody->mbo_eadatasize = 0;
1650         repbody->mbo_aclsize = 0;
1651
1652         rc = mdt_init_ucred_intent_getattr(info, reqbody);
1653         if (unlikely(rc))
1654                 GOTO(out_shrink, rc);
1655
1656         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1657         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1658                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1659                 lhc->mlh_reg_lh.cookie = 0;
1660         }
1661         mdt_exit_ucred(info);
1662         EXIT;
1663 out_shrink:
1664         mdt_client_compatibility(info);
1665         rc2 = mdt_fix_reply(info);
1666         if (rc == 0)
1667                 rc = rc2;
1668         mdt_thread_info_fini(info);
1669         return rc;
1670 }
1671
1672 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1673                          void *karg, void __user *uarg);
1674
1675 static int mdt_set_info(struct tgt_session_info *tsi)
1676 {
1677         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1678         char                    *key;
1679         void                    *val;
1680         int                      keylen, vallen, rc = 0;
1681
1682         ENTRY;
1683
1684         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1685         if (key == NULL) {
1686                 DEBUG_REQ(D_HA, req, "no set_info key");
1687                 RETURN(err_serious(-EFAULT));
1688         }
1689
1690         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1691                                       RCL_CLIENT);
1692
1693         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1694         if (val == NULL) {
1695                 DEBUG_REQ(D_HA, req, "no set_info val");
1696                 RETURN(err_serious(-EFAULT));
1697         }
1698
1699         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1700                                       RCL_CLIENT);
1701
1702         /* Swab any part of val you need to here */
1703         if (KEY_IS(KEY_READ_ONLY)) {
1704                 spin_lock(&req->rq_export->exp_lock);
1705                 if (*(__u32 *)val)
1706                         *exp_connect_flags_ptr(req->rq_export) |=
1707                                 OBD_CONNECT_RDONLY;
1708                 else
1709                         *exp_connect_flags_ptr(req->rq_export) &=
1710                                 ~OBD_CONNECT_RDONLY;
1711                 spin_unlock(&req->rq_export->exp_lock);
1712         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1713                 struct changelog_setinfo *cs = val;
1714
1715                 if (vallen != sizeof(*cs)) {
1716                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1717                                tgt_name(tsi->tsi_tgt), vallen);
1718                         RETURN(-EINVAL);
1719                 }
1720                 if (ptlrpc_req_need_swab(req)) {
1721                         __swab64s(&cs->cs_recno);
1722                         __swab32s(&cs->cs_id);
1723                 }
1724
1725                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1726                                    vallen, val, NULL);
1727         } else if (KEY_IS(KEY_EVICT_BY_NID)) {
1728                 if (vallen > 0)
1729                         obd_export_evict_by_nid(req->rq_export->exp_obd, val);
1730         } else {
1731                 RETURN(-EINVAL);
1732         }
1733         RETURN(rc);
1734 }
1735
1736 static int mdt_readpage(struct tgt_session_info *tsi)
1737 {
1738         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1739         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1740         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1741         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1742         struct mdt_body         *repbody;
1743         int                      rc;
1744         int                      i;
1745
1746         ENTRY;
1747
1748         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1749                 RETURN(err_serious(-ENOMEM));
1750
1751         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1752         if (repbody == NULL || reqbody == NULL)
1753                 RETURN(err_serious(-EFAULT));
1754
1755         /*
1756          * prepare @rdpg before calling lower layers and transfer itself. Here
1757          * reqbody->size contains offset of where to start to read and
1758          * reqbody->nlink contains number bytes to read.
1759          */
1760         rdpg->rp_hash = reqbody->mbo_size;
1761         if (rdpg->rp_hash != reqbody->mbo_size) {
1762                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1763                        rdpg->rp_hash, reqbody->mbo_size);
1764                 RETURN(-EFAULT);
1765         }
1766
1767         rdpg->rp_attrs = reqbody->mbo_mode;
1768         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1769                 rdpg->rp_attrs |= LUDA_64BITHASH;
1770         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1771                                 exp_max_brw_size(tsi->tsi_exp));
1772         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1773                           PAGE_CACHE_SHIFT;
1774         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1775         if (rdpg->rp_pages == NULL)
1776                 RETURN(-ENOMEM);
1777
1778         for (i = 0; i < rdpg->rp_npages; ++i) {
1779                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1780                 if (rdpg->rp_pages[i] == NULL)
1781                         GOTO(free_rdpg, rc = -ENOMEM);
1782         }
1783
1784         /* call lower layers to fill allocated pages with directory data */
1785         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1786         if (rc < 0)
1787                 GOTO(free_rdpg, rc);
1788
1789         /* send pages to client */
1790         rc = tgt_sendpage(tsi, rdpg, rc);
1791
1792         EXIT;
1793 free_rdpg:
1794
1795         for (i = 0; i < rdpg->rp_npages; i++)
1796                 if (rdpg->rp_pages[i] != NULL)
1797                         __free_page(rdpg->rp_pages[i]);
1798         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1799
1800         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1801                 RETURN(0);
1802
1803         return rc;
1804 }
1805
1806 static int mdt_reint_internal(struct mdt_thread_info *info,
1807                               struct mdt_lock_handle *lhc,
1808                               __u32 op)
1809 {
1810         struct req_capsule      *pill = info->mti_pill;
1811         struct mdt_body         *repbody;
1812         int                      rc = 0, rc2;
1813
1814         ENTRY;
1815
1816         rc = mdt_reint_unpack(info, op);
1817         if (rc != 0) {
1818                 CERROR("Can't unpack reint, rc %d\n", rc);
1819                 RETURN(err_serious(rc));
1820         }
1821
1822         /* for replay (no_create) lmm is not needed, client has it already */
1823         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1824                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1825                                      DEF_REP_MD_SIZE);
1826
1827         /* llog cookies are always 0, the field is kept for compatibility */
1828         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1829                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1830
1831         rc = req_capsule_server_pack(pill);
1832         if (rc != 0) {
1833                 CERROR("Can't pack response, rc %d\n", rc);
1834                 RETURN(err_serious(rc));
1835         }
1836
1837         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1838                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1839                 LASSERT(repbody);
1840                 repbody->mbo_eadatasize = 0;
1841                 repbody->mbo_aclsize = 0;
1842         }
1843
1844         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1845
1846         /* for replay no cookkie / lmm need, because client have this already */
1847         if (info->mti_spec.no_create)
1848                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1849                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1850
1851         rc = mdt_init_ucred_reint(info);
1852         if (rc)
1853                 GOTO(out_shrink, rc);
1854
1855         rc = mdt_fix_attr_ucred(info, op);
1856         if (rc != 0)
1857                 GOTO(out_ucred, rc = err_serious(rc));
1858
1859         rc = mdt_check_resent(info, mdt_reconstruct, lhc);
1860         if (rc < 0) {
1861                 GOTO(out_ucred, rc);
1862         } else if (rc == 1) {
1863                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1864                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1865                 GOTO(out_ucred, rc);
1866         }
1867         rc = mdt_reint_rec(info, lhc);
1868         EXIT;
1869 out_ucred:
1870         mdt_exit_ucred(info);
1871 out_shrink:
1872         mdt_client_compatibility(info);
1873         rc2 = mdt_fix_reply(info);
1874         if (rc == 0)
1875                 rc = rc2;
1876         return rc;
1877 }
1878
1879 static long mdt_reint_opcode(struct ptlrpc_request *req,
1880                              const struct req_format **fmt)
1881 {
1882         struct mdt_device       *mdt;
1883         struct mdt_rec_reint    *rec;
1884         long                     opc;
1885
1886         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1887         if (rec != NULL) {
1888                 opc = rec->rr_opcode;
1889                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1890                 if (opc < REINT_MAX && fmt[opc] != NULL)
1891                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1892                 else {
1893                         mdt = mdt_exp2dev(req->rq_export);
1894                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1895                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1896                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1897                         opc = err_serious(-EFAULT);
1898                 }
1899         } else {
1900                 opc = err_serious(-EFAULT);
1901         }
1902         return opc;
1903 }
1904
1905 static int mdt_reint(struct tgt_session_info *tsi)
1906 {
1907         long opc;
1908         int  rc;
1909         static const struct req_format *reint_fmts[REINT_MAX] = {
1910                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1911                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1912                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1913                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1914                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1915                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1916                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1917                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1918                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1919         };
1920
1921         ENTRY;
1922
1923         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1924         if (opc >= 0) {
1925                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1926                 /*
1927                  * No lock possible here from client to pass it to reint code
1928                  * path.
1929                  */
1930                 rc = mdt_reint_internal(info, NULL, opc);
1931                 mdt_thread_info_fini(info);
1932         } else {
1933                 rc = opc;
1934         }
1935
1936         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1937         RETURN(rc);
1938 }
1939
1940 /* this should sync the whole device */
1941 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1942 {
1943         struct dt_device *dt = mdt->mdt_bottom;
1944         int rc;
1945         ENTRY;
1946
1947         rc = dt->dd_ops->dt_sync(env, dt);
1948         RETURN(rc);
1949 }
1950
1951 /* this should sync this object */
1952 static int mdt_object_sync(struct mdt_thread_info *info)
1953 {
1954         struct md_object *next;
1955         int rc;
1956         ENTRY;
1957
1958         if (!mdt_object_exists(info->mti_object)) {
1959                 CWARN("%s: non existing object "DFID": rc = %d\n",
1960                       mdt_obd_name(info->mti_mdt),
1961                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
1962                 RETURN(-ESTALE);
1963         }
1964         next = mdt_object_child(info->mti_object);
1965         rc = mo_object_sync(info->mti_env, next);
1966
1967         RETURN(rc);
1968 }
1969
1970 static int mdt_sync(struct tgt_session_info *tsi)
1971 {
1972         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1973         struct req_capsule      *pill = tsi->tsi_pill;
1974         struct mdt_body         *body;
1975         int                      rc;
1976
1977         ENTRY;
1978
1979         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1980                 RETURN(err_serious(-ENOMEM));
1981
1982         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
1983                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1984         } else {
1985                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1986
1987                 /* sync an object */
1988                 rc = mdt_object_sync(info);
1989                 if (rc == 0) {
1990                         const struct lu_fid *fid;
1991                         struct lu_attr *la = &info->mti_attr.ma_attr;
1992
1993                         info->mti_attr.ma_need = MA_INODE;
1994                         info->mti_attr.ma_valid = 0;
1995                         rc = mdt_attr_get_complex(info, info->mti_object,
1996                                                   &info->mti_attr);
1997                         if (rc == 0) {
1998                                 body = req_capsule_server_get(pill,
1999                                                               &RMF_MDT_BODY);
2000                                 fid = mdt_object_fid(info->mti_object);
2001                                 mdt_pack_attr2body(info, body, la, fid);
2002                         }
2003                 }
2004                 mdt_thread_info_fini(info);
2005         }
2006         if (rc == 0)
2007                 mdt_counter_incr(req, LPROC_MDT_SYNC);
2008
2009         RETURN(rc);
2010 }
2011
2012 /*
2013  * Handle quota control requests to consult current usage/limit, but also
2014  * to configure quota enforcement
2015  */
2016 static int mdt_quotactl(struct tgt_session_info *tsi)
2017 {
2018         struct obd_export       *exp  = tsi->tsi_exp;
2019         struct req_capsule      *pill = tsi->tsi_pill;
2020         struct obd_quotactl     *oqctl, *repoqc;
2021         int                      id, rc;
2022         struct mdt_device       *mdt = mdt_exp2dev(exp);
2023         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2024         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
2025         ENTRY;
2026
2027         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2028         if (oqctl == NULL)
2029                 RETURN(err_serious(-EPROTO));
2030
2031         rc = req_capsule_server_pack(pill);
2032         if (rc)
2033                 RETURN(err_serious(rc));
2034
2035         switch (oqctl->qc_cmd) {
2036                 /* master quotactl */
2037         case Q_SETINFO:
2038         case Q_SETQUOTA:
2039                 if (!nodemap_can_setquota(nodemap))
2040                         RETURN(-EPERM);
2041         case Q_GETINFO:
2042         case Q_GETQUOTA:
2043                 if (qmt == NULL)
2044                         RETURN(-EOPNOTSUPP);
2045                 /* slave quotactl */
2046         case Q_GETOINFO:
2047         case Q_GETOQUOTA:
2048                 break;
2049         default:
2050                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2051                 RETURN(-EFAULT);
2052         }
2053
2054         /* map uid/gid for remote client */
2055         id = oqctl->qc_id;
2056         if (exp_connect_rmtclient(exp)) {
2057                 struct lustre_idmap_table *idmap;
2058
2059                 idmap = exp->exp_mdt_data.med_idmap;
2060
2061                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2062                              oqctl->qc_cmd != Q_GETINFO))
2063                         RETURN(-EPERM);
2064
2065                 if (oqctl->qc_type == USRQUOTA)
2066                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2067                                                      oqctl->qc_id);
2068                 else if (oqctl->qc_type == GRPQUOTA)
2069                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2070                                                      oqctl->qc_id);
2071                 else
2072                         RETURN(-EINVAL);
2073
2074                 if (id == CFS_IDMAP_NOTFOUND) {
2075                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2076                         RETURN(-EACCES);
2077                 }
2078         }
2079
2080         if (oqctl->qc_type == USRQUOTA)
2081                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2082                                     NODEMAP_CLIENT_TO_FS, id);
2083         else if (oqctl->qc_type == GRPQUOTA)
2084                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2085                                     NODEMAP_CLIENT_TO_FS, id);
2086
2087         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2088         if (repoqc == NULL)
2089                 RETURN(err_serious(-EFAULT));
2090
2091         if (oqctl->qc_id != id)
2092                 swap(oqctl->qc_id, id);
2093
2094         switch (oqctl->qc_cmd) {
2095
2096         case Q_GETINFO:
2097         case Q_SETINFO:
2098         case Q_SETQUOTA:
2099         case Q_GETQUOTA:
2100                 /* forward quotactl request to QMT */
2101                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2102                 break;
2103
2104         case Q_GETOINFO:
2105         case Q_GETOQUOTA:
2106                 /* slave quotactl */
2107                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2108                                    oqctl);
2109                 break;
2110
2111         default:
2112                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2113                 RETURN(-EFAULT);
2114         }
2115
2116         if (oqctl->qc_id != id)
2117                 swap(oqctl->qc_id, id);
2118
2119         *repoqc = *oqctl;
2120         RETURN(rc);
2121 }
2122
2123 /** clone llog ctxt from child (mdd)
2124  * This allows remote llog (replicator) access.
2125  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2126  * context was originally set up, or we can handle them directly.
2127  * I choose the latter, but that means I need any llog
2128  * contexts set up by child to be accessable by the mdt.  So we clone the
2129  * context into our context list here.
2130  */
2131 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2132                                int idx)
2133 {
2134         struct md_device  *next = mdt->mdt_child;
2135         struct llog_ctxt *ctxt;
2136         int rc;
2137
2138         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2139                 return 0;
2140
2141         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2142         if (rc || ctxt == NULL) {
2143                 return 0;
2144         }
2145
2146         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2147         if (rc)
2148                 CERROR("Can't set mdt ctxt %d\n", rc);
2149
2150         return rc;
2151 }
2152
2153 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2154                                  struct mdt_device *mdt, int idx)
2155 {
2156         struct llog_ctxt *ctxt;
2157
2158         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2159         if (ctxt == NULL)
2160                 return 0;
2161         /* Put once for the get we just did, and once for the clone */
2162         llog_ctxt_put(ctxt);
2163         llog_ctxt_put(ctxt);
2164         return 0;
2165 }
2166
2167 /*
2168  * sec context handlers
2169  */
2170 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2171 {
2172         int rc;
2173
2174         rc = mdt_handle_idmap(tsi);
2175         if (unlikely(rc)) {
2176                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2177                 __u32                    opc;
2178
2179                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2180                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2181                         sptlrpc_svc_ctx_invalidate(req);
2182         }
2183
2184         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2185
2186         return rc;
2187 }
2188
2189 /*
2190  * quota request handlers
2191  */
2192 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2193 {
2194         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2195         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2196         int                      rc;
2197         ENTRY;
2198
2199         if (qmt == NULL)
2200                 RETURN(err_serious(-EOPNOTSUPP));
2201
2202         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2203         RETURN(rc);
2204 }
2205
2206 struct mdt_object *mdt_object_new(const struct lu_env *env,
2207                                   struct mdt_device *d,
2208                                   const struct lu_fid *f)
2209 {
2210         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2211         struct lu_object *o;
2212         struct mdt_object *m;
2213         ENTRY;
2214
2215         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2216         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2217         if (unlikely(IS_ERR(o)))
2218                 m = (struct mdt_object *)o;
2219         else
2220                 m = mdt_obj(o);
2221         RETURN(m);
2222 }
2223
2224 struct mdt_object *mdt_object_find(const struct lu_env *env,
2225                                    struct mdt_device *d,
2226                                    const struct lu_fid *f)
2227 {
2228         struct lu_object *o;
2229         struct mdt_object *m;
2230         ENTRY;
2231
2232         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2233         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2234         if (unlikely(IS_ERR(o)))
2235                 m = (struct mdt_object *)o;
2236         else
2237                 m = mdt_obj(o);
2238
2239         RETURN(m);
2240 }
2241
2242 /**
2243  * Asyncronous commit for mdt device.
2244  *
2245  * Pass asynchonous commit call down the MDS stack.
2246  *
2247  * \param env environment
2248  * \param mdt the mdt device
2249  */
2250 static void mdt_device_commit_async(const struct lu_env *env,
2251                                     struct mdt_device *mdt)
2252 {
2253         struct dt_device *dt = mdt->mdt_bottom;
2254         int rc;
2255         ENTRY;
2256
2257         rc = dt->dd_ops->dt_commit_async(env, dt);
2258         if (unlikely(rc != 0))
2259                 CWARN("%s: async commit start failed: rc = %d\n",
2260                       mdt_obd_name(mdt), rc);
2261         atomic_inc(&mdt->mdt_async_commit_count);
2262         EXIT;
2263 }
2264
2265 /**
2266  * Mark the lock as "synchonous".
2267  *
2268  * Mark the lock to deffer transaction commit to the unlock time.
2269  *
2270  * \param lock the lock to mark as "synchonous"
2271  *
2272  * \see mdt_is_lock_sync
2273  * \see mdt_save_lock
2274  */
2275 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2276 {
2277         lock->l_ast_data = (void*)1;
2278 }
2279
2280 /**
2281  * Check whehter the lock "synchonous" or not.
2282  *
2283  * \param lock the lock to check
2284  * \retval 1 the lock is "synchonous"
2285  * \retval 0 the lock isn't "synchronous"
2286  *
2287  * \see mdt_set_lock_sync
2288  * \see mdt_save_lock
2289  */
2290 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2291 {
2292         return lock->l_ast_data != NULL;
2293 }
2294
2295 /**
2296  * Blocking AST for mdt locks.
2297  *
2298  * Starts transaction commit if in case of COS lock conflict or
2299  * deffers such a commit to the mdt_save_lock.
2300  *
2301  * \param lock the lock which blocks a request or cancelling lock
2302  * \param desc unused
2303  * \param data unused
2304  * \param flag indicates whether this cancelling or blocking callback
2305  * \retval 0
2306  * \see ldlm_blocking_ast_nocheck
2307  */
2308 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2309                      void *data, int flag)
2310 {
2311         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2312         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2313         int rc;
2314         ENTRY;
2315
2316         if (flag == LDLM_CB_CANCELING)
2317                 RETURN(0);
2318
2319         lock_res_and_lock(lock);
2320         if (lock->l_blocking_ast != mdt_blocking_ast) {
2321                 unlock_res_and_lock(lock);
2322                 RETURN(0);
2323         }
2324         if (lock->l_req_mode & (LCK_PW | LCK_EX) &&
2325             lock->l_blocking_lock != NULL) {
2326                 if (mdt_cos_is_enabled(mdt) &&
2327                     lock->l_client_cookie !=
2328                     lock->l_blocking_lock->l_client_cookie)
2329                         mdt_set_lock_sync(lock);
2330                 else if (mdt_slc_is_enabled(mdt) &&
2331                          ldlm_is_cos_incompat(lock->l_blocking_lock))
2332                         mdt_set_lock_sync(lock);
2333         }
2334         rc = ldlm_blocking_ast_nocheck(lock);
2335
2336         /* There is no lock conflict if l_blocking_lock == NULL,
2337          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2338          * when the last reference to a local lock was released */
2339         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2340                 struct lu_env env;
2341
2342                 rc = lu_env_init(&env, LCT_LOCAL);
2343                 if (unlikely(rc != 0))
2344                         CWARN("%s: lu_env initialization failed, cannot "
2345                               "start asynchronous commit: rc = %d\n",
2346                               obd->obd_name, rc);
2347                 else
2348                         mdt_device_commit_async(&env, mdt);
2349                 lu_env_fini(&env);
2350         }
2351         RETURN(rc);
2352 }
2353
2354 /*
2355  * Blocking AST for cross-MDT lock
2356  *
2357  * Discard lock from uncommitted_slc_locks and cancel it.
2358  *
2359  * \param lock  the lock which blocks a request or cancelling lock
2360  * \param desc  unused
2361  * \param data  unused
2362  * \param flag  indicates whether this cancelling or blocking callback
2363  * \retval      0 on success
2364  * \retval      negative number on error
2365  */
2366 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2367                             void *data, int flag)
2368 {
2369         struct lustre_handle lockh;
2370         int               rc;
2371         ENTRY;
2372
2373         switch (flag) {
2374         case LDLM_CB_BLOCKING:
2375                 ldlm_lock2handle(lock, &lockh);
2376                 rc = ldlm_cli_cancel(&lockh,
2377                         ldlm_is_atomic_cb(lock) ? 0 : LCF_ASYNC);
2378                 if (rc < 0) {
2379                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2380                         RETURN(rc);
2381                 }
2382                 break;
2383         case LDLM_CB_CANCELING:
2384                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2385                 /* discard slc lock here so that it can be cleaned anytime,
2386                  * especially for cleanup_resource() */
2387                 tgt_discard_slc_lock(lock);
2388                 break;
2389         default:
2390                 LBUG();
2391         }
2392
2393         RETURN(0);
2394 }
2395
2396 int mdt_check_resent_lock(struct mdt_thread_info *info,
2397                           struct mdt_object *mo,
2398                           struct mdt_lock_handle *lhc)
2399 {
2400         /* the lock might already be gotten in ldlm_handle_enqueue() */
2401         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2402                 struct ptlrpc_request *req = mdt_info_req(info);
2403                 struct ldlm_lock      *lock;
2404
2405                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2406                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2407                 if (lock == NULL) {
2408                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2409                          * a resend case, however, it could be already destroyed
2410                          * due to client eviction or a raced cancel RPC. */
2411                         LDLM_DEBUG_NOLOCK("Invalid lock handle "LPX64"\n",
2412                                           lhc->mlh_reg_lh.cookie);
2413                         RETURN(-ESTALE);
2414                 }
2415
2416                 if (!fid_res_name_eq(mdt_object_fid(mo),
2417                                      &lock->l_resource->lr_name)) {
2418                         CWARN("%s: Although resent, but still not "
2419                               "get child lock:"DFID"\n",
2420                               info->mti_exp->exp_obd->obd_name,
2421                               PFID(mdt_object_fid(mo)));
2422                         LDLM_LOCK_PUT(lock);
2423                         RETURN(-EPROTO);
2424                 }
2425                 LDLM_LOCK_PUT(lock);
2426                 return 0;
2427         }
2428         return 1;
2429 }
2430
2431 int mdt_remote_object_lock(struct mdt_thread_info *mti, struct mdt_object *o,
2432                            const struct lu_fid *fid, struct lustre_handle *lh,
2433                            enum ldlm_mode mode, __u64 ibits, bool nonblock)
2434 {
2435         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2436         union ldlm_policy_data *policy = &mti->mti_policy;
2437         struct ldlm_res_id *res_id = &mti->mti_res_id;
2438         int rc = 0;
2439         ENTRY;
2440
2441         LASSERT(mdt_object_remote(o));
2442
2443         fid_build_reg_res_name(fid, res_id);
2444
2445         memset(einfo, 0, sizeof(*einfo));
2446         einfo->ei_type = LDLM_IBITS;
2447         einfo->ei_mode = mode;
2448         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2449         einfo->ei_cb_cp = ldlm_completion_ast;
2450         einfo->ei_enq_slave = 0;
2451         einfo->ei_res_id = res_id;
2452         if (nonblock)
2453                 einfo->ei_nonblock = 1;
2454
2455         memset(policy, 0, sizeof(*policy));
2456         policy->l_inodebits.bits = ibits;
2457
2458         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2459                             policy);
2460         RETURN(rc);
2461 }
2462
2463 static int mdt_object_local_lock(struct mdt_thread_info *info,
2464                                  struct mdt_object *o,
2465                                  struct mdt_lock_handle *lh, __u64 ibits,
2466                                  bool nonblock, bool cos_incompat)
2467 {
2468         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2469         union ldlm_policy_data *policy = &info->mti_policy;
2470         struct ldlm_res_id *res_id = &info->mti_res_id;
2471         __u64 dlmflags = 0;
2472         int rc;
2473         ENTRY;
2474
2475         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2476         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2477         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2478         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2479
2480         if (cos_incompat) {
2481                 LASSERT(lh->mlh_reg_mode == LCK_PW ||
2482                         lh->mlh_reg_mode == LCK_EX);
2483                 dlmflags |= LDLM_FL_COS_INCOMPAT;
2484         } else if (mdt_cos_is_enabled(info->mti_mdt)) {
2485                 dlmflags |= LDLM_FL_COS_ENABLED;
2486         }
2487
2488         /* Only enqueue LOOKUP lock for remote object */
2489         if (mdt_object_remote(o))
2490                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2491
2492         if (lh->mlh_type == MDT_PDO_LOCK) {
2493                 /* check for exists after object is locked */
2494                 if (mdt_object_exists(o) == 0) {
2495                         /* Non-existent object shouldn't have PDO lock */
2496                         RETURN(-ESTALE);
2497                 } else {
2498                         /* Non-dir object shouldn't have PDO lock */
2499                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2500                                 RETURN(-ENOTDIR);
2501                 }
2502         }
2503
2504         memset(policy, 0, sizeof(*policy));
2505         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2506
2507         dlmflags |= LDLM_FL_ATOMIC_CB;
2508         if (nonblock)
2509                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2510
2511         /*
2512          * Take PDO lock on whole directory and build correct @res_id for lock
2513          * on part of directory.
2514          */
2515         if (lh->mlh_pdo_hash != 0) {
2516                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2517                 mdt_lock_pdo_mode(info, o, lh);
2518                 if (lh->mlh_pdo_mode != LCK_NL) {
2519                         /*
2520                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2521                          * is never going to be sent to client and we do not
2522                          * want it slowed down due to possible cancels.
2523                          */
2524                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2525                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2526                                           policy, res_id, dlmflags,
2527                                           info->mti_exp == NULL ? NULL :
2528                                           &info->mti_exp->exp_handle.h_cookie);
2529                         if (unlikely(rc != 0))
2530                                 GOTO(out_unlock, rc);
2531                 }
2532
2533                 /*
2534                  * Finish res_id initializing by name hash marking part of
2535                  * directory which is taking modification.
2536                  */
2537                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2538         }
2539
2540         policy->l_inodebits.bits = ibits;
2541
2542         /*
2543          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2544          * going to be sent to client. If it is - mdt_intent_policy() path will
2545          * fix it up and turn FL_LOCAL flag off.
2546          */
2547         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2548                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2549                           info->mti_exp == NULL ? NULL :
2550                           &info->mti_exp->exp_handle.h_cookie);
2551 out_unlock:
2552         if (rc != 0)
2553                 mdt_object_unlock(info, o, lh, 1);
2554         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2555                    lh->mlh_pdo_hash != 0 &&
2556                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2557                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2558
2559         RETURN(rc);
2560 }
2561
2562 static int
2563 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2564                          struct mdt_lock_handle *lh, __u64 ibits, bool nonblock,
2565                          bool cos_incompat)
2566 {
2567         struct mdt_lock_handle *local_lh = NULL;
2568         int rc;
2569         ENTRY;
2570
2571         if (!mdt_object_remote(o)) {
2572                 rc = mdt_object_local_lock(info, o, lh, ibits, nonblock,
2573                                            cos_incompat);
2574                 RETURN(rc);
2575         }
2576
2577         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2578         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2579                    MDS_INODELOCK_XATTR);
2580
2581         /* Only enqueue LOOKUP lock for remote object */
2582         if (ibits & MDS_INODELOCK_LOOKUP) {
2583                 rc = mdt_object_local_lock(info, o, lh, MDS_INODELOCK_LOOKUP,
2584                                            nonblock, cos_incompat);
2585                 if (rc != ELDLM_OK)
2586                         RETURN(rc);
2587
2588                 local_lh = lh;
2589         }
2590
2591         if (ibits & MDS_INODELOCK_UPDATE) {
2592                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2593                  * enqueue RPC can only request 1 lock, to avoid extra
2594                  * RPC, so it will instead enqueue EX lock for remote
2595                  * object anyway XXX*/
2596                 if (lh->mlh_type == MDT_PDO_LOCK &&
2597                     lh->mlh_pdo_hash != 0) {
2598                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2599                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2600                                PFID(mdt_object_fid(o)));
2601                         lh->mlh_pdo_hash = 0;
2602                         lh->mlh_rreg_mode = LCK_EX;
2603                         lh->mlh_type = MDT_REG_LOCK;
2604                 }
2605                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2606                                             &lh->mlh_rreg_lh,
2607                                             lh->mlh_rreg_mode,
2608                                             MDS_INODELOCK_UPDATE, nonblock);
2609                 if (rc != ELDLM_OK) {
2610                         if (local_lh != NULL)
2611                                 mdt_object_unlock(info, o, local_lh, rc);
2612                         RETURN(rc);
2613                 }
2614         }
2615
2616         RETURN(0);
2617 }
2618
2619 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2620                     struct mdt_lock_handle *lh, __u64 ibits)
2621 {
2622         return mdt_object_lock_internal(info, o, lh, ibits, false, false);
2623 }
2624
2625 int mdt_reint_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2626                           struct mdt_lock_handle *lh, __u64 ibits,
2627                           bool cos_incompat)
2628 {
2629         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2630         return mdt_object_lock_internal(info, o, lh, ibits, false,
2631                                         cos_incompat);
2632 }
2633
2634 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2635                         struct mdt_lock_handle *lh, __u64 ibits)
2636 {
2637         struct mdt_lock_handle tmp = *lh;
2638         int rc;
2639
2640         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, false);
2641         if (rc == 0)
2642                 *lh = tmp;
2643
2644         return rc == 0;
2645 }
2646
2647 int mdt_reint_object_lock_try(struct mdt_thread_info *info,
2648                               struct mdt_object *o, struct mdt_lock_handle *lh,
2649                               __u64 ibits, bool cos_incompat)
2650 {
2651         struct mdt_lock_handle tmp = *lh;
2652         int rc;
2653
2654         LASSERT(lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX);
2655         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, cos_incompat);
2656         if (rc == 0)
2657                 *lh = tmp;
2658
2659         return rc == 0;
2660 }
2661
2662 /**
2663  * Save a lock within request object.
2664  *
2665  * Keep the lock referenced until whether client ACK or transaction
2666  * commit happens or release the lock immediately depending on input
2667  * parameters. If COS is ON, a write lock is converted to COS lock
2668  * before saving.
2669  *
2670  * \param info thead info object
2671  * \param h lock handle
2672  * \param mode lock mode
2673  * \param decref force immediate lock releasing
2674  */
2675 static void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2676                           enum ldlm_mode mode, int decref)
2677 {
2678         ENTRY;
2679
2680         if (lustre_handle_is_used(h)) {
2681                 if (decref || !info->mti_has_trans ||
2682                     !(mode & (LCK_PW | LCK_EX))) {
2683                         mdt_fid_unlock(h, mode);
2684                 } else {
2685                         struct mdt_device *mdt = info->mti_mdt;
2686                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2687                         struct ptlrpc_request *req = mdt_info_req(info);
2688                         int cos;
2689
2690                         cos = (mdt_cos_is_enabled(mdt) ||
2691                                mdt_slc_is_enabled(mdt));
2692
2693                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2694                                  h->cookie);
2695
2696                         /* there is no request if mdt_object_unlock() is called
2697                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2698                         if (likely(req != NULL)) {
2699                                 CDEBUG(D_HA, "request = %p reply state = %p"
2700                                        " transno = "LPD64"\n", req,
2701                                        req->rq_reply_state, req->rq_transno);
2702                                 if (cos) {
2703                                         ldlm_lock_downgrade(lock, LCK_COS);
2704                                         mode = LCK_COS;
2705                                 }
2706                                 ptlrpc_save_lock(req, h, mode, cos);
2707                         } else {
2708                                 mdt_fid_unlock(h, mode);
2709                         }
2710                         if (mdt_is_lock_sync(lock)) {
2711                                 CDEBUG(D_HA, "found sync-lock,"
2712                                        " async commit started\n");
2713                                 mdt_device_commit_async(info->mti_env,
2714                                                         mdt);
2715                         }
2716                         LDLM_LOCK_PUT(lock);
2717                 }
2718                 h->cookie = 0ull;
2719         }
2720
2721         EXIT;
2722 }
2723
2724 /**
2725  * Save cross-MDT lock in uncommitted_slc_locks
2726  *
2727  * Keep the lock referenced until transaction commit happens or release the lock
2728  * immediately depending on input parameters.
2729  *
2730  * \param info thead info object
2731  * \param h lock handle
2732  * \param mode lock mode
2733  * \param decref force immediate lock releasing
2734  */
2735 static void mdt_save_remote_lock(struct mdt_thread_info *info,
2736                                  struct lustre_handle *h, enum ldlm_mode mode,
2737                                  int decref)
2738 {
2739         ENTRY;
2740
2741         if (lustre_handle_is_used(h)) {
2742                 if (decref || !info->mti_has_trans ||
2743                     !(mode & (LCK_PW | LCK_EX))) {
2744                         ldlm_lock_decref_and_cancel(h, mode);
2745                 } else {
2746                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2747                         struct ptlrpc_request *req = mdt_info_req(info);
2748
2749                         LASSERT(req != NULL);
2750                         tgt_save_slc_lock(lock, req->rq_transno);
2751                         ldlm_lock_decref(h, mode);
2752                 }
2753                 h->cookie = 0ull;
2754         }
2755
2756         EXIT;
2757 }
2758
2759 /**
2760  * Unlock mdt object.
2761  *
2762  * Immeditely release the regular lock and the PDO lock or save the
2763  * lock in request and keep them referenced until client ACK or
2764  * transaction commit.
2765  *
2766  * \param info thread info object
2767  * \param o mdt object
2768  * \param lh mdt lock handle referencing regular and PDO locks
2769  * \param decref force immediate lock releasing
2770  */
2771 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2772                        struct mdt_lock_handle *lh, int decref)
2773 {
2774         ENTRY;
2775
2776         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2777         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2778         mdt_save_remote_lock(info, &lh->mlh_rreg_lh, lh->mlh_rreg_mode, decref);
2779
2780         EXIT;
2781 }
2782
2783 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2784                                         const struct lu_fid *f,
2785                                         struct mdt_lock_handle *lh,
2786                                         __u64 ibits)
2787 {
2788         struct mdt_object *o;
2789
2790         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2791         if (!IS_ERR(o)) {
2792                 int rc;
2793
2794                 rc = mdt_object_lock(info, o, lh, ibits);
2795                 if (rc != 0) {
2796                         mdt_object_put(info->mti_env, o);
2797                         o = ERR_PTR(rc);
2798                 }
2799         }
2800         return o;
2801 }
2802
2803 void mdt_object_unlock_put(struct mdt_thread_info * info,
2804                            struct mdt_object * o,
2805                            struct mdt_lock_handle *lh,
2806                            int decref)
2807 {
2808         mdt_object_unlock(info, o, lh, decref);
2809         mdt_object_put(info->mti_env, o);
2810 }
2811
2812 /*
2813  * Generic code handling requests that have struct mdt_body passed in:
2814  *
2815  *  - extract mdt_body from request and save it in @info, if present;
2816  *
2817  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2818  *  @info;
2819  *
2820  *  - if HABEO_CORPUS flag is set for this request type check whether object
2821  *  actually exists on storage (lu_object_exists()).
2822  *
2823  */
2824 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2825 {
2826         const struct mdt_body    *body;
2827         struct mdt_object        *obj;
2828         const struct lu_env      *env;
2829         struct req_capsule       *pill;
2830         int                       rc;
2831         ENTRY;
2832
2833         env = info->mti_env;
2834         pill = info->mti_pill;
2835
2836         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2837         if (body == NULL)
2838                 RETURN(-EFAULT);
2839
2840         if (!(body->mbo_valid & OBD_MD_FLID))
2841                 RETURN(0);
2842
2843         if (!fid_is_sane(&body->mbo_fid1)) {
2844                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2845                 RETURN(-EINVAL);
2846         }
2847
2848         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
2849         if (!IS_ERR(obj)) {
2850                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
2851                         mdt_object_put(env, obj);
2852                         rc = -ENOENT;
2853                 } else {
2854                         info->mti_object = obj;
2855                         rc = 0;
2856                 }
2857         } else
2858                 rc = PTR_ERR(obj);
2859
2860         RETURN(rc);
2861 }
2862
2863 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2864 {
2865         struct req_capsule *pill = info->mti_pill;
2866         int rc;
2867         ENTRY;
2868
2869         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2870                 rc = mdt_body_unpack(info, flags);
2871         else
2872                 rc = 0;
2873
2874         if (rc == 0 && (flags & HABEO_REFERO)) {
2875                 /* Pack reply. */
2876                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2877                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2878                                              DEF_REP_MD_SIZE);
2879                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2880                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2881                                              RCL_SERVER, 0);
2882
2883                 rc = req_capsule_server_pack(pill);
2884         }
2885         RETURN(rc);
2886 }
2887
2888 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2889 {
2890         lh->mlh_type = MDT_NUL_LOCK;
2891         lh->mlh_reg_lh.cookie = 0ull;
2892         lh->mlh_reg_mode = LCK_MINMODE;
2893         lh->mlh_pdo_lh.cookie = 0ull;
2894         lh->mlh_pdo_mode = LCK_MINMODE;
2895         lh->mlh_rreg_lh.cookie = 0ull;
2896         lh->mlh_rreg_mode = LCK_MINMODE;
2897 }
2898
2899 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2900 {
2901         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2902         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2903 }
2904
2905 /*
2906  * Initialize fields of struct mdt_thread_info. Other fields are left in
2907  * uninitialized state, because it's too expensive to zero out whole
2908  * mdt_thread_info (> 1K) on each request arrival.
2909  */
2910 void mdt_thread_info_init(struct ptlrpc_request *req,
2911                           struct mdt_thread_info *info)
2912 {
2913         int i;
2914
2915         info->mti_pill = &req->rq_pill;
2916
2917         /* lock handle */
2918         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2919                 mdt_lock_handle_init(&info->mti_lh[i]);
2920
2921         /* mdt device: it can be NULL while CONNECT */
2922         if (req->rq_export) {
2923                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2924                 info->mti_exp = req->rq_export;
2925         } else
2926                 info->mti_mdt = NULL;
2927         info->mti_env = req->rq_svc_thread->t_env;
2928         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2929
2930         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2931         info->mti_big_buf = LU_BUF_NULL;
2932         info->mti_body = NULL;
2933         info->mti_object = NULL;
2934         info->mti_dlm_req = NULL;
2935         info->mti_has_trans = 0;
2936         info->mti_cross_ref = 0;
2937         info->mti_opdata = 0;
2938         info->mti_big_lmm_used = 0;
2939
2940         info->mti_spec.no_create = 0;
2941         info->mti_spec.sp_rm_entry = 0;
2942         info->mti_spec.sp_permitted = 0;
2943         info->mti_spec.sp_migrate_close = 0;
2944
2945         info->mti_spec.u.sp_ea.eadata = NULL;
2946         info->mti_spec.u.sp_ea.eadatalen = 0;
2947 }
2948
2949 void mdt_thread_info_fini(struct mdt_thread_info *info)
2950 {
2951         int i;
2952
2953         if (info->mti_object != NULL) {
2954                 mdt_object_put(info->mti_env, info->mti_object);
2955                 info->mti_object = NULL;
2956         }
2957
2958         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2959                 mdt_lock_handle_fini(&info->mti_lh[i]);
2960         info->mti_env = NULL;
2961         info->mti_pill = NULL;
2962         info->mti_exp = NULL;
2963
2964         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2965                 lu_buf_free(&info->mti_big_buf);
2966 }
2967
2968 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2969 {
2970         struct mdt_thread_info  *mti;
2971
2972         mti = mdt_th_info(tsi->tsi_env);
2973         LASSERT(mti != NULL);
2974
2975         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2976         if (tsi->tsi_corpus != NULL) {
2977                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2978                 lu_object_get(tsi->tsi_corpus);
2979         }
2980         mti->mti_body = tsi->tsi_mdt_body;
2981         mti->mti_dlm_req = tsi->tsi_dlm_req;
2982
2983         return mti;
2984 }
2985
2986 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2987 {
2988         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2989         int                      rc;
2990
2991         ENTRY;
2992
2993         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
2994             cfs_fail_val ==
2995             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
2996                 set_current_state(TASK_UNINTERRUPTIBLE);
2997                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
2998         }
2999
3000         rc = tgt_connect(tsi);
3001         if (rc != 0)
3002                 RETURN(rc);
3003
3004         rc = mdt_init_idmap(tsi);
3005         if (rc != 0)
3006                 GOTO(err, rc);
3007         RETURN(0);
3008 err:
3009         obd_disconnect(class_export_get(req->rq_export));
3010         return rc;
3011 }
3012
3013 enum mdt_it_code {
3014         MDT_IT_OPEN,
3015         MDT_IT_OCREAT,
3016         MDT_IT_CREATE,
3017         MDT_IT_GETATTR,
3018         MDT_IT_READDIR,
3019         MDT_IT_LOOKUP,
3020         MDT_IT_UNLINK,
3021         MDT_IT_TRUNC,
3022         MDT_IT_GETXATTR,
3023         MDT_IT_LAYOUT,
3024         MDT_IT_QUOTA,
3025         MDT_IT_NR
3026 };
3027
3028 static int mdt_intent_getattr(enum mdt_it_code opcode,
3029                               struct mdt_thread_info *info,
3030                               struct ldlm_lock **,
3031                               __u64);
3032
3033 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3034                                 struct mdt_thread_info *info,
3035                                 struct ldlm_lock **lockp,
3036                                 __u64 flags);
3037
3038 static int mdt_intent_layout(enum mdt_it_code opcode,
3039                              struct mdt_thread_info *info,
3040                              struct ldlm_lock **,
3041                              __u64);
3042 static int mdt_intent_reint(enum mdt_it_code opcode,
3043                             struct mdt_thread_info *info,
3044                             struct ldlm_lock **,
3045                             __u64);
3046
3047 static struct mdt_it_flavor {
3048         const struct req_format *it_fmt;
3049         __u32                    it_flags;
3050         int                    (*it_act)(enum mdt_it_code ,
3051                                          struct mdt_thread_info *,
3052                                          struct ldlm_lock **,
3053                                          __u64);
3054         long                     it_reint;
3055 } mdt_it_flavor[] = {
3056         [MDT_IT_OPEN]     = {
3057                 .it_fmt   = &RQF_LDLM_INTENT,
3058                 /*.it_flags = HABEO_REFERO,*/
3059                 .it_flags = 0,
3060                 .it_act   = mdt_intent_reint,
3061                 .it_reint = REINT_OPEN
3062         },
3063         [MDT_IT_OCREAT]   = {
3064                 .it_fmt   = &RQF_LDLM_INTENT,
3065                 /*
3066                  * OCREAT is not a MUTABOR request as if the file
3067                  * already exists.
3068                  * We do the extra check of OBD_CONNECT_RDONLY in
3069                  * mdt_reint_open() when we really need to create
3070                  * the object.
3071                  */
3072                 .it_flags = 0,
3073                 .it_act   = mdt_intent_reint,
3074                 .it_reint = REINT_OPEN
3075         },
3076         [MDT_IT_CREATE]   = {
3077                 .it_fmt   = &RQF_LDLM_INTENT,
3078                 .it_flags = MUTABOR,
3079                 .it_act   = mdt_intent_reint,
3080                 .it_reint = REINT_CREATE
3081         },
3082         [MDT_IT_GETATTR]  = {
3083                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3084                 .it_flags = HABEO_REFERO,
3085                 .it_act   = mdt_intent_getattr
3086         },
3087         [MDT_IT_READDIR]  = {
3088                 .it_fmt   = NULL,
3089                 .it_flags = 0,
3090                 .it_act   = NULL
3091         },
3092         [MDT_IT_LOOKUP]   = {
3093                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3094                 .it_flags = HABEO_REFERO,
3095                 .it_act   = mdt_intent_getattr
3096         },
3097         [MDT_IT_UNLINK]   = {
3098                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
3099                 .it_flags = MUTABOR,
3100                 .it_act   = NULL,
3101                 .it_reint = REINT_UNLINK
3102         },
3103         [MDT_IT_TRUNC]    = {
3104                 .it_fmt   = NULL,
3105                 .it_flags = MUTABOR,
3106                 .it_act   = NULL
3107         },
3108         [MDT_IT_GETXATTR] = {
3109                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3110                 .it_flags = HABEO_CORPUS,
3111                 .it_act   = mdt_intent_getxattr
3112         },
3113         [MDT_IT_LAYOUT] = {
3114                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3115                 .it_flags = 0,
3116                 .it_act   = mdt_intent_layout
3117         }
3118 };
3119
3120 static int
3121 mdt_intent_lock_replace(struct mdt_thread_info *info,
3122                         struct ldlm_lock **lockp,
3123                         struct mdt_lock_handle *lh,
3124                         __u64 flags)
3125 {
3126         struct ptlrpc_request  *req = mdt_info_req(info);
3127         struct ldlm_lock       *lock = *lockp;
3128         struct ldlm_lock       *new_lock;
3129
3130         /* If possible resent found a lock, @lh is set to its handle */
3131         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3132
3133         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3134                 lh->mlh_reg_lh.cookie = 0;
3135                 RETURN(0);
3136         }
3137
3138         LASSERTF(new_lock != NULL,
3139                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
3140
3141         /*
3142          * If we've already given this lock to a client once, then we should
3143          * have no readers or writers.  Otherwise, we should have one reader
3144          * _or_ writer ref (which will be zeroed below) before returning the
3145          * lock to a client.
3146          */
3147         if (new_lock->l_export == req->rq_export) {
3148                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3149         } else {
3150                 LASSERT(new_lock->l_export == NULL);
3151                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3152         }
3153
3154         *lockp = new_lock;
3155
3156         if (new_lock->l_export == req->rq_export) {
3157                 /*
3158                  * Already gave this to the client, which means that we
3159                  * reconstructed a reply.
3160                  */
3161                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3162                         MSG_RESENT);
3163
3164                 LDLM_LOCK_RELEASE(new_lock);
3165                 lh->mlh_reg_lh.cookie = 0;
3166                 RETURN(ELDLM_LOCK_REPLACED);
3167         }
3168
3169         /*
3170          * Fixup the lock to be given to the client.
3171          */
3172         lock_res_and_lock(new_lock);
3173         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3174          * possible blocking AST. */
3175         while (new_lock->l_readers > 0) {
3176                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3177                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3178                 new_lock->l_readers--;
3179         }
3180         while (new_lock->l_writers > 0) {
3181                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3182                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3183                 new_lock->l_writers--;
3184         }
3185
3186         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3187         new_lock->l_blocking_ast = lock->l_blocking_ast;
3188         new_lock->l_completion_ast = lock->l_completion_ast;
3189         new_lock->l_remote_handle = lock->l_remote_handle;
3190         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3191
3192         unlock_res_and_lock(new_lock);
3193
3194         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3195                      &new_lock->l_remote_handle,
3196                      &new_lock->l_exp_hash);
3197
3198         LDLM_LOCK_RELEASE(new_lock);
3199         lh->mlh_reg_lh.cookie = 0;
3200
3201         RETURN(ELDLM_LOCK_REPLACED);
3202 }
3203
3204 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3205                                     struct ldlm_lock *new_lock,
3206                                     struct mdt_lock_handle *lh,
3207                                     __u64 flags)
3208 {
3209         struct ptlrpc_request  *req = mdt_info_req(info);
3210         struct ldlm_request    *dlmreq;
3211
3212         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3213                 return;
3214
3215         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3216
3217         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3218          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3219          * initialized. */
3220         if (flags & LDLM_FL_RESENT) {
3221                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3222                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3223
3224                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3225                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie "LPX64,
3226                           lh->mlh_reg_lh.cookie);
3227                 return;
3228         }
3229
3230         /*
3231          * If the xid matches, then we know this is a resent request, and allow
3232          * it. (It's probably an OPEN, for which we don't send a lock.
3233          */
3234         if (req_can_reconstruct(req, NULL))
3235                 return;
3236
3237         /*
3238          * This remote handle isn't enqueued, so we never received or processed
3239          * this request.  Clear MSG_RESENT, because it can be handled like any
3240          * normal request now.
3241          */
3242         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3243
3244         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3245                   dlmreq->lock_handle[0].cookie);
3246 }
3247
3248 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3249                                 struct mdt_thread_info *info,
3250                                 struct ldlm_lock **lockp,
3251                                 __u64 flags)
3252 {
3253         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3254         struct ldlm_reply      *ldlm_rep = NULL;
3255         int rc, grc;
3256
3257         /*
3258          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3259          * (for the resend case) or a new lock. Below we will use it to
3260          * replace the original lock.
3261          */
3262         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3263         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3264                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3265                 rc = mdt_object_lock(info, info->mti_object, lhc,
3266                                      MDS_INODELOCK_XATTR);
3267                 if (rc)
3268                         return rc;
3269         }
3270
3271         grc = mdt_getxattr(info);
3272
3273         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3274
3275         if (mdt_info_req(info)->rq_repmsg != NULL)
3276                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3277         if (ldlm_rep == NULL)
3278                 RETURN(err_serious(-EFAULT));
3279
3280         ldlm_rep->lock_policy_res2 = grc;
3281
3282         return rc;
3283 }
3284
3285 static int mdt_intent_getattr(enum mdt_it_code opcode,
3286                               struct mdt_thread_info *info,
3287                               struct ldlm_lock **lockp,
3288                               __u64 flags)
3289 {
3290         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3291         __u64                   child_bits;
3292         struct ldlm_reply      *ldlm_rep;
3293         struct mdt_body        *reqbody;
3294         struct mdt_body        *repbody;
3295         int                     rc, rc2;
3296         ENTRY;
3297
3298         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3299         LASSERT(reqbody);
3300
3301         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3302         LASSERT(repbody);
3303
3304         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3305         repbody->mbo_eadatasize = 0;
3306         repbody->mbo_aclsize = 0;
3307
3308         switch (opcode) {
3309         case MDT_IT_LOOKUP:
3310                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3311                 break;
3312         case MDT_IT_GETATTR:
3313                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3314                              MDS_INODELOCK_PERM;
3315                 break;
3316         default:
3317                 CERROR("Unsupported intent (%d)\n", opcode);
3318                 GOTO(out_shrink, rc = -EINVAL);
3319         }
3320
3321         rc = mdt_init_ucred_intent_getattr(info, reqbody);
3322         if (rc)
3323                 GOTO(out_shrink, rc);
3324
3325         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3326         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3327
3328         /* Get lock from request for possible resent case. */
3329         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3330
3331         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3332         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3333
3334         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3335                 ldlm_rep->lock_policy_res2 = 0;
3336         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3337             ldlm_rep->lock_policy_res2) {
3338                 lhc->mlh_reg_lh.cookie = 0ull;
3339                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3340         }
3341
3342         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3343         EXIT;
3344 out_ucred:
3345         mdt_exit_ucred(info);
3346 out_shrink:
3347         mdt_client_compatibility(info);
3348         rc2 = mdt_fix_reply(info);
3349         if (rc == 0)
3350                 rc = rc2;
3351         return rc;
3352 }
3353
3354 static int mdt_intent_layout(enum mdt_it_code opcode,
3355                              struct mdt_thread_info *info,
3356                              struct ldlm_lock **lockp,
3357                              __u64 flags)
3358 {
3359         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3360         struct layout_intent *layout;
3361         struct lu_fid *fid;
3362         struct mdt_object *obj = NULL;
3363         int layout_size = 0;
3364         int rc = 0;
3365         ENTRY;
3366
3367         if (opcode != MDT_IT_LAYOUT) {
3368                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3369                         opcode);
3370                 RETURN(-EINVAL);
3371         }
3372
3373         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3374         if (layout == NULL)
3375                 RETURN(-EPROTO);
3376
3377         if (layout->li_opc != LAYOUT_INTENT_ACCESS) {
3378                 CERROR("%s: Unsupported layout intent opc %d\n",
3379                        mdt_obd_name(info->mti_mdt), layout->li_opc);
3380                 RETURN(-EINVAL);
3381         }
3382
3383         fid = &info->mti_tmp_fid2;
3384         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3385
3386         /* Get lock from request for possible resent case. */
3387         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3388
3389         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3390         if (IS_ERR(obj))
3391                 GOTO(out, rc = PTR_ERR(obj));
3392
3393         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3394                 layout_size = mdt_attr_get_eabuf_size(info, obj);
3395                 if (layout_size < 0)
3396                         GOTO(out_obj, rc = layout_size);
3397
3398                 if (layout_size > info->mti_mdt->mdt_max_mdsize)
3399                         info->mti_mdt->mdt_max_mdsize = layout_size;
3400         }
3401
3402         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3403         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3404                              layout_size);
3405         rc = req_capsule_server_pack(info->mti_pill);
3406         GOTO(out_obj, rc);
3407
3408 out_obj:
3409         mdt_object_put(info->mti_env, obj);
3410
3411         if (rc == 0 && lustre_handle_is_used(&lhc->mlh_reg_lh))
3412                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3413
3414 out:
3415         lhc->mlh_reg_lh.cookie = 0;
3416
3417         return rc;
3418 }
3419
3420 static int mdt_intent_reint(enum mdt_it_code opcode,
3421                             struct mdt_thread_info *info,
3422                             struct ldlm_lock **lockp,
3423                             __u64 flags)
3424 {
3425         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3426         struct ldlm_reply      *rep = NULL;
3427         long                    opc;
3428         int                     rc;
3429
3430         static const struct req_format *intent_fmts[REINT_MAX] = {
3431                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3432                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3433         };
3434
3435         ENTRY;
3436
3437         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3438         if (opc < 0)
3439                 RETURN(opc);
3440
3441         if (mdt_it_flavor[opcode].it_reint != opc) {
3442                 CERROR("Reint code %ld doesn't match intent: %d\n",
3443                        opc, opcode);
3444                 RETURN(err_serious(-EPROTO));
3445         }
3446
3447         /* Get lock from request for possible resent case. */
3448         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3449
3450         rc = mdt_reint_internal(info, lhc, opc);
3451
3452         /* Check whether the reply has been packed successfully. */
3453         if (mdt_info_req(info)->rq_repmsg != NULL)
3454                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3455         if (rep == NULL)
3456                 RETURN(err_serious(-EFAULT));
3457
3458         /* MDC expects this in any case */
3459         if (rc != 0)
3460                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3461
3462         /* the open lock or the lock for cross-ref object should be
3463          * returned to the client */
3464         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3465             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3466                 rep->lock_policy_res2 = 0;
3467                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3468                 RETURN(rc);
3469         }
3470
3471         rep->lock_policy_res2 = clear_serious(rc);
3472
3473         if (rep->lock_policy_res2 == -ENOENT &&
3474             mdt_get_disposition(rep, DISP_LOOKUP_NEG) &&
3475             !mdt_get_disposition(rep, DISP_OPEN_CREATE))
3476                 rep->lock_policy_res2 = 0;
3477
3478         lhc->mlh_reg_lh.cookie = 0ull;
3479         if (rc == -ENOTCONN || rc == -ENODEV ||
3480             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3481                 /*
3482                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3483                  * will be returned by rq_status, and client at ptlrpc layer
3484                  * will detect this, then disconnect, reconnect the import
3485                  * immediately, instead of impacting the following the rpc.
3486                  */
3487                 RETURN(rc);
3488         }
3489         /*
3490          * For other cases, the error will be returned by intent, and client
3491          * will retrieve the result from intent.
3492          */
3493         RETURN(ELDLM_LOCK_ABORTED);
3494 }
3495
3496 static int mdt_intent_code(enum ldlm_intent_flags itcode)
3497 {
3498         int rc;
3499
3500         switch (itcode) {
3501         case IT_OPEN:
3502                 rc = MDT_IT_OPEN;
3503                 break;
3504         case IT_OPEN|IT_CREAT:
3505                 rc = MDT_IT_OCREAT;
3506                 break;
3507         case IT_CREAT:
3508                 rc = MDT_IT_CREATE;
3509                 break;
3510         case IT_READDIR:
3511                 rc = MDT_IT_READDIR;
3512                 break;
3513         case IT_GETATTR:
3514                 rc = MDT_IT_GETATTR;
3515                 break;
3516         case IT_LOOKUP:
3517                 rc = MDT_IT_LOOKUP;
3518                 break;
3519         case IT_UNLINK:
3520                 rc = MDT_IT_UNLINK;
3521                 break;
3522         case IT_TRUNC:
3523                 rc = MDT_IT_TRUNC;
3524                 break;
3525         case IT_GETXATTR:
3526                 rc = MDT_IT_GETXATTR;
3527                 break;
3528         case IT_LAYOUT:
3529                 rc = MDT_IT_LAYOUT;
3530                 break;
3531         case IT_QUOTA_DQACQ:
3532         case IT_QUOTA_CONN:
3533                 rc = MDT_IT_QUOTA;
3534                 break;
3535         default:
3536                 CERROR("Unknown intent opcode: 0x%08x\n", itcode);
3537                 rc = -EINVAL;
3538                 break;
3539         }
3540         return rc;
3541 }
3542
3543 static int mdt_intent_opc(enum ldlm_intent_flags itopc,
3544                           struct mdt_thread_info *info,
3545                           struct ldlm_lock **lockp, __u64 flags)
3546 {
3547         struct req_capsule      *pill = info->mti_pill;
3548         struct ptlrpc_request   *req = mdt_info_req(info);
3549         struct mdt_it_flavor    *flv;
3550         int opc;
3551         int rc;
3552         ENTRY;
3553
3554         opc = mdt_intent_code(itopc);
3555         if (opc < 0)
3556                 RETURN(-EINVAL);
3557
3558         if (opc == MDT_IT_QUOTA) {
3559                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3560
3561                 if (qmt == NULL)
3562                         RETURN(-EOPNOTSUPP);
3563
3564                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3565                 /* pass the request to quota master */
3566                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3567                                                  mdt_info_req(info), lockp,
3568                                                  flags);
3569                 RETURN(rc);
3570         }
3571
3572         flv = &mdt_it_flavor[opc];
3573         if (flv->it_fmt != NULL)
3574                 req_capsule_extend(pill, flv->it_fmt);
3575
3576         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3577         if (rc < 0)
3578                 RETURN(rc);
3579
3580         if (flv->it_flags & MUTABOR &&
3581             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3582                 RETURN(-EROFS);
3583
3584         if (flv->it_act != NULL) {
3585                 struct ldlm_reply *rep;
3586
3587                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
3588
3589                 /* execute policy */
3590                 rc = flv->it_act(opc, info, lockp, flags);
3591
3592                 /* Check whether the reply has been packed successfully. */
3593                 if (req->rq_repmsg != NULL) {
3594                         rep = req_capsule_server_get(info->mti_pill,
3595                                                      &RMF_DLM_REP);
3596                         rep->lock_policy_res2 =
3597                                 ptlrpc_status_hton(rep->lock_policy_res2);
3598                 }
3599         }
3600
3601         RETURN(rc);
3602 }
3603
3604 static int mdt_intent_policy(struct ldlm_namespace *ns,
3605                              struct ldlm_lock **lockp, void *req_cookie,
3606                              enum ldlm_mode mode, __u64 flags, void *data)
3607 {
3608         struct tgt_session_info *tsi;
3609         struct mdt_thread_info  *info;
3610         struct ptlrpc_request   *req  =  req_cookie;
3611         struct ldlm_intent      *it;
3612         struct req_capsule      *pill;
3613         int rc;
3614
3615         ENTRY;
3616
3617         LASSERT(req != NULL);
3618
3619         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3620
3621         info = tsi2mdt_info(tsi);
3622         LASSERT(info != NULL);
3623         pill = info->mti_pill;
3624         LASSERT(pill->rc_req == req);
3625
3626         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3627                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3628                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3629                 if (it != NULL) {
3630                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3631                         if (rc == 0)
3632                                 rc = ELDLM_OK;
3633
3634                         /* Lock without inodebits makes no sense and will oops
3635                          * later in ldlm. Let's check it now to see if we have
3636                          * ibits corrupted somewhere in mdt_intent_opc().
3637                          * The case for client miss to set ibits has been
3638                          * processed by others. */
3639                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3640                                         lr_type == LDLM_IBITS,
3641                                      info->mti_dlm_req->lock_desc.\
3642                                         l_policy_data.l_inodebits.bits != 0));
3643                 } else
3644                         rc = err_serious(-EFAULT);
3645         } else {
3646                 /* No intent was provided */
3647                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3648                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3649                 rc = req_capsule_server_pack(pill);
3650                 if (rc)
3651                         rc = err_serious(rc);
3652         }
3653         mdt_thread_info_fini(info);
3654         RETURN(rc);
3655 }
3656
3657 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3658 {
3659         struct seq_server_site  *ss = mdt_seq_site(mdt);
3660
3661         if (ss->ss_node_id == 0)
3662                 return;
3663
3664         if (ss->ss_client_seq != NULL) {
3665                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3666                 ss->ss_client_seq->lcs_exp = NULL;
3667         }
3668
3669         if (ss->ss_server_fld != NULL) {
3670                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3671                 ss->ss_server_fld->lsf_control_exp = NULL;
3672         }
3673 }
3674
3675 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3676 {
3677         struct seq_server_site *ss = mdt_seq_site(mdt);
3678
3679         if (ss == NULL)
3680                 return;
3681
3682         if (ss->ss_server_seq != NULL)
3683                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3684 }
3685
3686 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3687 {
3688         mdt_seq_fini_cli(mdt);
3689         mdt_deregister_seq_exp(mdt);
3690
3691         return seq_site_fini(env, mdt_seq_site(mdt));
3692 }
3693
3694 /**
3695  * It will retrieve its FLDB entries from MDT0, and it only happens
3696  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3697  * and it needs to refresh FLDB from the MDT0.
3698  **/
3699 static int mdt_register_lwp_callback(void *data)
3700 {
3701         struct lu_env           env;
3702         struct mdt_device       *mdt = data;
3703         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3704         int                     rc;
3705         ENTRY;
3706
3707         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3708
3709         rc = lu_env_init(&env, LCT_MD_THREAD);
3710         if (rc < 0) {
3711                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3712                 RETURN(rc);
3713         }
3714
3715         /* Allocate new sequence now to avoid creating local transaction
3716          * in the normal transaction process */
3717         rc = seq_server_check_and_alloc_super(&env,
3718                                               mdt_seq_site(mdt)->ss_server_seq);
3719         if (rc < 0)
3720                 GOTO(out, rc);
3721
3722         if (fld->lsf_new) {
3723                 rc = fld_update_from_controller(&env, fld);
3724                 if (rc != 0) {
3725                         CERROR("%s: cannot update controller: rc = %d\n",
3726                                mdt_obd_name(mdt), rc);
3727                         GOTO(out, rc);
3728                 }
3729         }
3730 out:
3731         lu_env_fini(&env);
3732         RETURN(rc);
3733 }
3734
3735 static int mdt_register_seq_exp(struct mdt_device *mdt)
3736 {
3737         struct seq_server_site  *ss = mdt_seq_site(mdt);
3738         char                    *lwp_name = NULL;
3739         int                     rc;
3740
3741         if (ss->ss_node_id == 0)
3742                 return 0;
3743
3744         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3745         if (lwp_name == NULL)
3746                 GOTO(out_free, rc = -ENOMEM);
3747
3748         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3749         if (rc != 0)
3750                 GOTO(out_free, rc);
3751
3752         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3753                                       NULL, NULL);
3754         if (rc != 0)
3755                 GOTO(out_free, rc);
3756
3757         rc = lustre_register_lwp_item(lwp_name,
3758                                       &ss->ss_server_fld->lsf_control_exp,
3759                                       mdt_register_lwp_callback, mdt);
3760         if (rc != 0) {
3761                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3762                 ss->ss_client_seq->lcs_exp = NULL;
3763                 GOTO(out_free, rc);
3764         }
3765 out_free:
3766         if (lwp_name != NULL)
3767                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3768
3769         return rc;
3770 }
3771
3772 /*
3773  * Init client sequence manager which is used by local MDS to talk to sequence
3774  * controller on remote node.
3775  */
3776 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3777 {
3778         struct seq_server_site  *ss = mdt_seq_site(mdt);
3779         int                     rc;
3780         char                    *prefix;
3781         ENTRY;
3782
3783         /* check if this is adding the first MDC and controller is not yet
3784          * initialized. */
3785         OBD_ALLOC_PTR(ss->ss_client_seq);
3786         if (ss->ss_client_seq == NULL)
3787                 RETURN(-ENOMEM);
3788
3789         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3790         if (prefix == NULL) {
3791                 OBD_FREE_PTR(ss->ss_client_seq);
3792                 ss->ss_client_seq = NULL;
3793                 RETURN(-ENOMEM);
3794         }
3795
3796         /* Note: seq_client_fini will be called in seq_site_fini */
3797         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3798         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3799                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3800                                                             NULL);
3801         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3802         if (rc != 0) {
3803                 OBD_FREE_PTR(ss->ss_client_seq);
3804                 ss->ss_client_seq = NULL;
3805                 RETURN(rc);
3806         }
3807
3808         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3809
3810         RETURN(rc);
3811 }
3812
3813 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3814 {
3815         struct seq_server_site  *ss;
3816         int                     rc;
3817         ENTRY;
3818
3819         ss = mdt_seq_site(mdt);
3820         /* init sequence controller server(MDT0) */
3821         if (ss->ss_node_id == 0) {
3822                 OBD_ALLOC_PTR(ss->ss_control_seq);
3823                 if (ss->ss_control_seq == NULL)
3824                         RETURN(-ENOMEM);
3825
3826                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3827                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3828                                      ss);
3829                 if (rc)
3830                         GOTO(out_seq_fini, rc);
3831         }
3832
3833         /* Init normal sequence server */
3834         OBD_ALLOC_PTR(ss->ss_server_seq);
3835         if (ss->ss_server_seq == NULL)
3836                 GOTO(out_seq_fini, rc = -ENOMEM);
3837
3838         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3839                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3840         if (rc)
3841                 GOTO(out_seq_fini, rc);
3842
3843         /* init seq client for seq server to talk to seq controller(MDT0) */
3844         rc = mdt_seq_init_cli(env, mdt);
3845         if (rc != 0)
3846                 GOTO(out_seq_fini, rc);
3847
3848         if (ss->ss_node_id != 0)
3849                 /* register controller export through lwp */
3850                 rc = mdt_register_seq_exp(mdt);
3851
3852         EXIT;
3853 out_seq_fini:
3854         if (rc)
3855                 mdt_seq_fini(env, mdt);
3856
3857         return rc;
3858 }
3859
3860 /*
3861  * FLD wrappers
3862  */
3863 static int mdt_fld_fini(const struct lu_env *env,
3864                         struct mdt_device *m)
3865 {
3866         struct seq_server_site *ss = mdt_seq_site(m);
3867         ENTRY;
3868
3869         if (ss && ss->ss_server_fld) {
3870                 fld_server_fini(env, ss->ss_server_fld);
3871                 OBD_FREE_PTR(ss->ss_server_fld);
3872                 ss->ss_server_fld = NULL;
3873         }
3874
3875         RETURN(0);
3876 }
3877
3878 static int mdt_fld_init(const struct lu_env *env,
3879                         const char *uuid,
3880                         struct mdt_device *m)
3881 {
3882         struct seq_server_site *ss;
3883         int rc;
3884         ENTRY;
3885
3886         ss = mdt_seq_site(m);
3887
3888         OBD_ALLOC_PTR(ss->ss_server_fld);
3889         if (ss->ss_server_fld == NULL)
3890                 RETURN(rc = -ENOMEM);
3891
3892         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3893                              LU_SEQ_RANGE_MDT);
3894         if (rc) {
3895                 OBD_FREE_PTR(ss->ss_server_fld);
3896                 ss->ss_server_fld = NULL;
3897                 RETURN(rc);
3898         }
3899
3900         RETURN(0);
3901 }
3902
3903 static void mdt_stack_pre_fini(const struct lu_env *env,
3904                            struct mdt_device *m, struct lu_device *top)
3905 {
3906         struct lustre_cfg_bufs  *bufs;
3907         struct lustre_cfg       *lcfg;
3908         struct mdt_thread_info  *info;
3909         ENTRY;
3910
3911         LASSERT(top);
3912
3913         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3914         LASSERT(info != NULL);
3915
3916         bufs = &info->mti_u.bufs;
3917
3918         LASSERT(m->mdt_child_exp);
3919         LASSERT(m->mdt_child_exp->exp_obd);
3920
3921         /* process cleanup, pass mdt obd name to get obd umount flags */
3922         /* XXX: this is needed because all layers are referenced by
3923          * objects (some of them are pinned by osd, for example *
3924          * the proper solution should be a model where object used
3925          * by osd only doesn't have mdt/mdd slices -bzzz */
3926         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3927         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3928         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3929         if (lcfg == NULL)
3930                 RETURN_EXIT;
3931
3932         top->ld_ops->ldo_process_config(env, top, lcfg);
3933         lustre_cfg_free(lcfg);
3934         EXIT;
3935 }
3936
3937 static void mdt_stack_fini(const struct lu_env *env,
3938                            struct mdt_device *m, struct lu_device *top)
3939 {
3940         struct obd_device       *obd = mdt2obd_dev(m);
3941         struct lustre_cfg_bufs  *bufs;
3942         struct lustre_cfg       *lcfg;
3943         struct mdt_thread_info  *info;
3944         char                     flags[3] = "";
3945         ENTRY;
3946
3947         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3948         LASSERT(info != NULL);
3949
3950         lu_dev_del_linkage(top->ld_site, top);
3951
3952         lu_site_purge(env, top->ld_site, -1);
3953
3954         bufs = &info->mti_u.bufs;
3955         /* process cleanup, pass mdt obd name to get obd umount flags */
3956         /* another purpose is to let all layers to release their objects */
3957         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3958         if (obd->obd_force)
3959                 strcat(flags, "F");
3960         if (obd->obd_fail)
3961                 strcat(flags, "A");
3962         lustre_cfg_bufs_set_string(bufs, 1, flags);
3963         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3964         if (lcfg == NULL)
3965                 RETURN_EXIT;
3966
3967         LASSERT(top);
3968         top->ld_ops->ldo_process_config(env, top, lcfg);
3969         lustre_cfg_free(lcfg);
3970
3971         lu_site_purge(env, top->ld_site, -1);
3972
3973         m->mdt_child = NULL;
3974         m->mdt_bottom = NULL;
3975
3976         obd_disconnect(m->mdt_child_exp);
3977         m->mdt_child_exp = NULL;
3978
3979         obd_disconnect(m->mdt_bottom_exp);
3980         m->mdt_child_exp = NULL;
3981 }
3982
3983 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3984                                const char *next, struct obd_export **exp)
3985 {
3986         struct obd_connect_data *data = NULL;
3987         struct obd_device       *obd;
3988         int                      rc;
3989         ENTRY;
3990
3991         OBD_ALLOC_PTR(data);
3992         if (data == NULL)
3993                 GOTO(out, rc = -ENOMEM);
3994
3995         obd = class_name2obd(next);
3996         if (obd == NULL) {
3997                 CERROR("%s: can't locate next device: %s\n",
3998                        mdt_obd_name(m), next);
3999                 GOTO(out, rc = -ENOTCONN);
4000         }
4001
4002         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4003         data->ocd_version = LUSTRE_VERSION_CODE;
4004
4005         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
4006         if (rc) {
4007                 CERROR("%s: cannot connect to next dev %s (%d)\n",
4008                        mdt_obd_name(m), next, rc);
4009                 GOTO(out, rc);
4010         }
4011
4012 out:
4013         if (data)
4014                 OBD_FREE_PTR(data);
4015         RETURN(rc);
4016 }
4017
4018 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
4019                           struct lustre_cfg *cfg)
4020 {
4021         char                   *dev = lustre_cfg_string(cfg, 0);
4022         int                     rc, name_size, uuid_size;
4023         char                   *name, *uuid, *p;
4024         struct lustre_cfg_bufs *bufs;
4025         struct lustre_cfg      *lcfg;
4026         struct obd_device      *obd;
4027         struct lustre_profile  *lprof;
4028         struct lu_site         *site;
4029         ENTRY;
4030
4031         /* in 1.8 we had the only device in the stack - MDS.
4032          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
4033          * in 2.3 OSD is instantiated by obd_mount.c, so we need
4034          * to generate names and setup MDT, MDD. MDT will be using
4035          * generated name to connect to MDD. for MDD the next device
4036          * will be LOD with name taken from so called "profile" which
4037          * is generated by mount_option line
4038          *
4039          * 1.8 MGS generates config. commands like this:
4040          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
4041          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
4042          * 2.0 MGS generates config. commands like this:
4043          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
4044          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4045          *                    3:lustre-MDT0000-mdtlov  4:f
4046          *
4047          * we generate MDD name from MDT one, just replacing T with D
4048          *
4049          * after all the preparations, the logical equivalent will be
4050          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
4051          *                    3:lustre-MDT0000-mdtlov  4:f
4052          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4053          *                    3:lustre-MDD0000  4:f
4054          *
4055          *  notice we build the stack from down to top: MDD first, then MDT */
4056
4057         name_size = MAX_OBD_NAME;
4058         uuid_size = MAX_OBD_NAME;
4059
4060         OBD_ALLOC(name, name_size);
4061         OBD_ALLOC(uuid, uuid_size);
4062         if (name == NULL || uuid == NULL)
4063                 GOTO(cleanup_mem, rc = -ENOMEM);
4064
4065         OBD_ALLOC_PTR(bufs);
4066         if (!bufs)
4067                 GOTO(cleanup_mem, rc = -ENOMEM);
4068
4069         strcpy(name, dev);
4070         p = strstr(name, "-MDT");
4071         if (p == NULL)
4072                 GOTO(free_bufs, rc = -ENOMEM);
4073         p[3] = 'D';
4074
4075         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
4076
4077         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4078         if (lprof == NULL || lprof->lp_dt == NULL) {
4079                 CERROR("can't find the profile: %s\n",
4080                        lustre_cfg_string(cfg, 0));
4081                 GOTO(free_bufs, rc = -EINVAL);
4082         }
4083
4084         lustre_cfg_bufs_reset(bufs, name);
4085         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
4086         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4087         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4088
4089         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4090         if (lcfg == NULL)
4091                 GOTO(put_profile, rc = -ENOMEM);
4092
4093         rc = class_attach(lcfg);
4094         if (rc)
4095                 GOTO(lcfg_cleanup, rc);
4096
4097         obd = class_name2obd(name);
4098         if (!obd) {
4099                 CERROR("Can not find obd %s (%s in config)\n",
4100                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
4101                 GOTO(lcfg_cleanup, rc = -EINVAL);
4102         }
4103
4104         lustre_cfg_free(lcfg);
4105
4106         lustre_cfg_bufs_reset(bufs, name);
4107         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4108         lustre_cfg_bufs_set_string(bufs, 2, dev);
4109         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4110
4111         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4112         if (lcfg == NULL)
4113                 GOTO(class_detach, rc = -ENOMEM);
4114
4115         rc = class_setup(obd, lcfg);
4116         if (rc)
4117                 GOTO(class_detach, rc);
4118
4119         /* connect to MDD we just setup */
4120         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
4121         if (rc)
4122                 GOTO(class_detach, rc);
4123
4124         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
4125         LASSERT(site);
4126         LASSERT(mdt_lu_site(mdt) == NULL);
4127         mdt->mdt_lu_dev.ld_site = site;
4128         site->ls_top_dev = &mdt->mdt_lu_dev;
4129         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
4130
4131         /* now connect to bottom OSD */
4132         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
4133         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
4134         if (rc)
4135                 GOTO(class_detach, rc);
4136         mdt->mdt_bottom =
4137                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
4138
4139         rc = lu_env_refill((struct lu_env *)env);
4140         if (rc != 0)
4141                 CERROR("Failure to refill session: '%d'\n", rc);
4142
4143         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
4144
4145         EXIT;
4146 class_detach:
4147         if (rc)
4148                 class_detach(obd, lcfg);
4149 lcfg_cleanup:
4150         lustre_cfg_free(lcfg);
4151 put_profile:
4152         class_put_profile(lprof);
4153 free_bufs:
4154         OBD_FREE_PTR(bufs);
4155 cleanup_mem:
4156         if (name)
4157                 OBD_FREE(name, name_size);
4158         if (uuid)
4159                 OBD_FREE(uuid, uuid_size);
4160         RETURN(rc);
4161 }
4162
4163 /* setup quota master target on MDT0 */
4164 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
4165                           struct lustre_cfg *cfg)
4166 {
4167         struct obd_device       *obd;
4168         char                    *dev = lustre_cfg_string(cfg, 0);
4169         char                    *qmtname, *uuid, *p;
4170         struct lustre_cfg_bufs  *bufs;
4171         struct lustre_cfg       *lcfg;
4172         struct lustre_profile   *lprof;
4173         struct obd_connect_data *data;
4174         int                      rc;
4175         ENTRY;
4176
4177         LASSERT(mdt->mdt_qmt_exp == NULL);
4178         LASSERT(mdt->mdt_qmt_dev == NULL);
4179
4180         /* quota master is on MDT0 only for now */
4181         if (mdt->mdt_seq_site.ss_node_id != 0)
4182                 RETURN(0);
4183
4184         /* MGS generates config commands which look as follows:
4185          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
4186          *                    3:lustre-MDT0000-mdtlov  4:f
4187          *
4188          * We generate the QMT name from the MDT one, just replacing MD with QM
4189          * after all the preparations, the logical equivalent will be:
4190          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
4191          *                    3:lustre-MDT0000-osd  4:f */
4192         OBD_ALLOC(qmtname, MAX_OBD_NAME);
4193         OBD_ALLOC(uuid, UUID_MAX);
4194         OBD_ALLOC_PTR(bufs);
4195         OBD_ALLOC_PTR(data);
4196         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
4197                 GOTO(cleanup_mem, rc = -ENOMEM);
4198
4199         strcpy(qmtname, dev);
4200         p = strstr(qmtname, "-MDT");
4201         if (p == NULL)
4202                 GOTO(cleanup_mem, rc = -ENOMEM);
4203         /* replace MD with QM */
4204         p[1] = 'Q';
4205         p[2] = 'M';
4206
4207         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4208
4209         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4210         if (lprof == NULL || lprof->lp_dt == NULL) {
4211                 CERROR("can't find profile for %s\n",
4212                        lustre_cfg_string(cfg, 0));
4213                 GOTO(cleanup_mem, rc = -EINVAL);
4214         }
4215
4216         lustre_cfg_bufs_reset(bufs, qmtname);
4217         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4218         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4219         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4220
4221         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4222         if (lcfg == NULL)
4223                 GOTO(put_profile, rc = -ENOMEM);
4224
4225         rc = class_attach(lcfg);
4226         if (rc)
4227                 GOTO(lcfg_cleanup, rc);
4228
4229         obd = class_name2obd(qmtname);
4230         if (!obd) {
4231                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4232                        lustre_cfg_string(cfg, 0));
4233                 GOTO(lcfg_cleanup, rc = -EINVAL);
4234         }
4235
4236         lustre_cfg_free(lcfg);
4237
4238         lustre_cfg_bufs_reset(bufs, qmtname);
4239         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4240         lustre_cfg_bufs_set_string(bufs, 2, dev);
4241
4242         /* for quota, the next device should be the OSD device */
4243         lustre_cfg_bufs_set_string(bufs, 3,
4244                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4245
4246         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4247         if (lcfg == NULL)
4248                 GOTO(class_detach, rc = -ENOMEM);
4249
4250         rc = class_setup(obd, lcfg);
4251         if (rc)
4252                 GOTO(class_detach, rc);
4253
4254         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4255
4256         /* configure local quota objects */
4257         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4258                                                    &mdt->mdt_lu_dev,
4259                                                    mdt->mdt_qmt_dev);
4260         if (rc)
4261                 GOTO(class_cleanup, rc);
4262
4263         /* connect to quota master target */
4264         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4265         data->ocd_version = LUSTRE_VERSION_CODE;
4266         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4267                          data, NULL);
4268         if (rc) {
4269                 CERROR("cannot connect to quota master device %s (%d)\n",
4270                        qmtname, rc);
4271                 GOTO(class_cleanup, rc);
4272         }
4273
4274         EXIT;
4275 class_cleanup:
4276         if (rc) {
4277                 class_manual_cleanup(obd);
4278                 mdt->mdt_qmt_dev = NULL;
4279         }
4280 class_detach:
4281         if (rc)
4282                 class_detach(obd, lcfg);
4283 lcfg_cleanup:
4284         lustre_cfg_free(lcfg);
4285 put_profile:
4286         class_put_profile(lprof);
4287 cleanup_mem:
4288         if (bufs)
4289                 OBD_FREE_PTR(bufs);
4290         if (qmtname)
4291                 OBD_FREE(qmtname, MAX_OBD_NAME);
4292         if (uuid)
4293                 OBD_FREE(uuid, UUID_MAX);
4294         if (data)
4295                 OBD_FREE_PTR(data);
4296         return rc;
4297 }
4298
4299 /* Shutdown quota master target associated with mdt */
4300 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4301 {
4302         ENTRY;
4303
4304         if (mdt->mdt_qmt_exp == NULL)
4305                 RETURN_EXIT;
4306         LASSERT(mdt->mdt_qmt_dev != NULL);
4307
4308         /* the qmt automatically shuts down when the mdt disconnects */
4309         obd_disconnect(mdt->mdt_qmt_exp);
4310         mdt->mdt_qmt_exp = NULL;
4311         mdt->mdt_qmt_dev = NULL;
4312         EXIT;
4313 }
4314
4315 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4316  * for now. This will be removed along with converting rest of MDT code
4317  * to use tgt_session_info */
4318 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4319 {
4320         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4321         int                      rc;
4322
4323         rc = mdt_getxattr(info);
4324
4325         mdt_thread_info_fini(info);
4326         return rc;
4327 }
4328
4329 static struct tgt_handler mdt_tgt_handlers[] = {
4330 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4331                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4332                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4333 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4334                 0,                      MDS_DISCONNECT, tgt_disconnect,
4335                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4336 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4337                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4338                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4339 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4340 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GET_ROOT,   mdt_get_root),
4341 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4342 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4343                                                         mdt_getattr_name),
4344 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4345 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4346 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4347 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4348 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4349 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4350 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4351 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4352                                                         mdt_hsm_progress),
4353 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4354                                                         mdt_hsm_ct_register),
4355 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4356                                                         mdt_hsm_ct_unregister),
4357 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4358                                                         mdt_hsm_state_get),
4359 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4360                                                         mdt_hsm_state_set),
4361 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4362 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4363                                                         mdt_hsm_request),
4364 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4365             MDS_SWAP_LAYOUTS,
4366             mdt_swap_layouts),
4367 };
4368
4369 static struct tgt_handler mdt_sec_ctx_ops[] = {
4370 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4371 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4372 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4373 };
4374
4375 static struct tgt_handler mdt_quota_ops[] = {
4376 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4377 };
4378
4379 static struct tgt_opc_slice mdt_common_slice[] = {
4380         {
4381                 .tos_opc_start  = MDS_FIRST_OPC,
4382                 .tos_opc_end    = MDS_LAST_OPC,
4383                 .tos_hs         = mdt_tgt_handlers
4384         },
4385         {
4386                 .tos_opc_start  = OBD_FIRST_OPC,
4387                 .tos_opc_end    = OBD_LAST_OPC,
4388                 .tos_hs         = tgt_obd_handlers
4389         },
4390         {
4391                 .tos_opc_start  = LDLM_FIRST_OPC,
4392                 .tos_opc_end    = LDLM_LAST_OPC,
4393                 .tos_hs         = tgt_dlm_handlers
4394         },
4395         {
4396                 .tos_opc_start  = SEC_FIRST_OPC,
4397                 .tos_opc_end    = SEC_LAST_OPC,
4398                 .tos_hs         = mdt_sec_ctx_ops
4399         },
4400         {
4401                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4402                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4403                 .tos_hs         = tgt_out_handlers
4404         },
4405         {
4406                 .tos_opc_start  = FLD_FIRST_OPC,
4407                 .tos_opc_end    = FLD_LAST_OPC,
4408                 .tos_hs         = fld_handlers
4409         },
4410         {
4411                 .tos_opc_start  = SEQ_FIRST_OPC,
4412                 .tos_opc_end    = SEQ_LAST_OPC,
4413                 .tos_hs         = seq_handlers
4414         },
4415         {
4416                 .tos_opc_start  = QUOTA_DQACQ,
4417                 .tos_opc_end    = QUOTA_LAST_OPC,
4418                 .tos_hs         = mdt_quota_ops
4419         },
4420         {
4421                 .tos_opc_start  = LLOG_FIRST_OPC,
4422                 .tos_opc_end    = LLOG_LAST_OPC,
4423                 .tos_hs         = tgt_llog_handlers
4424         },
4425         {
4426                 .tos_opc_start  = LFSCK_FIRST_OPC,
4427                 .tos_opc_end    = LFSCK_LAST_OPC,
4428                 .tos_hs         = tgt_lfsck_handlers
4429         },
4430
4431         {
4432                 .tos_hs         = NULL
4433         }
4434 };
4435
4436 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4437 {
4438         struct md_device        *next = m->mdt_child;
4439         struct lu_device        *d    = &m->mdt_lu_dev;
4440         struct obd_device       *obd  = mdt2obd_dev(m);
4441         struct lfsck_stop        stop;
4442         ENTRY;
4443
4444         stop.ls_status = LS_PAUSED;
4445         stop.ls_flags = 0;
4446         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4447
4448         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4449         target_recovery_fini(obd);
4450         ping_evictor_stop();
4451
4452         if (m->mdt_opts.mo_coordinator)
4453                 mdt_hsm_cdt_stop(m);
4454
4455         mdt_hsm_cdt_fini(m);
4456
4457         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4458         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4459
4460         if (m->mdt_namespace != NULL)
4461                 ldlm_namespace_free_prior(m->mdt_namespace, NULL,
4462                                           d->ld_obd->obd_force);
4463
4464         obd_exports_barrier(obd);
4465         obd_zombie_barrier();
4466
4467         mdt_procfs_fini(m);
4468
4469         tgt_fini(env, &m->mdt_lut);
4470         mdt_fs_cleanup(env, m);
4471         upcall_cache_cleanup(m->mdt_identity_cache);
4472         m->mdt_identity_cache = NULL;
4473
4474         if (m->mdt_namespace != NULL) {
4475                 ldlm_namespace_free_post(m->mdt_namespace);
4476                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4477         }
4478
4479         mdt_quota_fini(env, m);
4480
4481         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4482
4483         mdt_seq_fini(env, m);
4484         mdt_fld_fini(env, m);
4485
4486         /*
4487          * Finish the stack
4488          */
4489         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4490
4491         LASSERT(atomic_read(&d->ld_ref) == 0);
4492
4493         server_put_mount(mdt_obd_name(m), true);
4494
4495         EXIT;
4496 }
4497
4498 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4499
4500 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4501                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4502 {
4503         struct mdt_thread_info    *info;
4504         struct obd_device         *obd;
4505         const char                *dev = lustre_cfg_string(cfg, 0);
4506         const char                *num = lustre_cfg_string(cfg, 2);
4507         struct lustre_mount_info  *lmi = NULL;
4508         struct lustre_sb_info     *lsi;
4509         struct lu_site            *s;
4510         struct seq_server_site    *ss_site;
4511         const char                *identity_upcall = "NONE";
4512         struct md_device          *next;
4513         int                        rc;
4514         long                       node_id;
4515         mntopt_t                   mntopts;
4516         ENTRY;
4517
4518         lu_device_init(&m->mdt_lu_dev, ldt);
4519         /*
4520          * Environment (env) might be missing mdt_thread_key values at that
4521          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4522          * mode.
4523          *
4524          * Usually device allocation path doesn't use module key values, but
4525          * mdt has to do a lot of work here, so allocate key value.
4526          */
4527         rc = lu_env_refill((struct lu_env *)env);
4528         if (rc != 0)
4529                 RETURN(rc);
4530
4531         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4532         LASSERT(info != NULL);
4533
4534         obd = class_name2obd(dev);
4535         LASSERT(obd != NULL);
4536
4537         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4538         m->mdt_opts.mo_evict_tgt_nids = 1;
4539         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4540
4541         /* default is coordinator off, it is started through conf_param
4542          * or /proc */
4543         m->mdt_opts.mo_coordinator = 0;
4544
4545         lmi = server_get_mount(dev);
4546         if (lmi == NULL) {
4547                 CERROR("Cannot get mount info for %s!\n", dev);
4548                 RETURN(-EFAULT);
4549         } else {
4550                 lsi = s2lsi(lmi->lmi_sb);
4551                 /* CMD is supported only in IAM mode */
4552                 LASSERT(num);
4553                 node_id = simple_strtol(num, NULL, 10);
4554                 obd->u.obt.obt_magic = OBT_MAGIC;
4555                 if (lsi->lsi_lmd != NULL &&
4556                     lsi->lsi_lmd->lmd_flags & LMD_FLG_SKIP_LFSCK)
4557                         m->mdt_skip_lfsck = 1;
4558         }
4559
4560         m->mdt_squash.rsi_uid = 0;
4561         m->mdt_squash.rsi_gid = 0;
4562         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4563         init_rwsem(&m->mdt_squash.rsi_sem);
4564         spin_lock_init(&m->mdt_osfs_lock);
4565         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4566         m->mdt_enable_remote_dir = 0;
4567         m->mdt_enable_remote_dir_gid = 0;
4568
4569         atomic_set(&m->mdt_mds_mds_conns, 0);
4570         atomic_set(&m->mdt_async_commit_count, 0);
4571
4572         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4573         m->mdt_lu_dev.ld_obd = obd;
4574         /* Set this lu_device to obd for error handling purposes. */
4575         obd->obd_lu_dev = &m->mdt_lu_dev;
4576
4577         /* init the stack */
4578         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4579         if (rc) {
4580                 CERROR("%s: Can't init device stack, rc %d\n",
4581                        mdt_obd_name(m), rc);
4582                 GOTO(err_lmi, rc);
4583         }
4584
4585         s = mdt_lu_site(m);
4586         ss_site = mdt_seq_site(m);
4587         s->ld_seq_site = ss_site;
4588         ss_site->ss_lu = s;
4589
4590         /* set server index */
4591         ss_site->ss_node_id = node_id;
4592
4593         /* failover is the default
4594          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4595          * assumed whose ss_node_id == 0 XXX
4596          * */
4597         obd->obd_replayable = 1;
4598         /* No connection accepted until configurations will finish */
4599         obd->obd_no_conn = 1;
4600
4601         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4602                 char *str = lustre_cfg_string(cfg, 4);
4603                 if (strchr(str, 'n')) {
4604                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4605                         obd->obd_replayable = 0;
4606                 }
4607         }
4608
4609         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4610         if (rc)
4611                 GOTO(err_fini_stack, rc);
4612
4613         rc = mdt_seq_init(env, m);
4614         if (rc)
4615                 GOTO(err_fini_fld, rc);
4616
4617         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4618                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4619         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4620                                               LDLM_NAMESPACE_SERVER,
4621                                               LDLM_NAMESPACE_GREEDY,
4622                                               LDLM_NS_TYPE_MDT);
4623         if (m->mdt_namespace == NULL)
4624                 GOTO(err_fini_seq, rc = -ENOMEM);
4625
4626         m->mdt_namespace->ns_lvbp = m;
4627         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4628
4629         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4630         /* set obd_namespace for compatibility with old code */
4631         obd->obd_namespace = m->mdt_namespace;
4632
4633         rc = mdt_hsm_cdt_init(m);
4634         if (rc != 0) {
4635                 CERROR("%s: error initializing coordinator, rc %d\n",
4636                        mdt_obd_name(m), rc);
4637                 GOTO(err_free_ns, rc);
4638         }
4639
4640         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4641                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4642                       OBD_FAIL_MDS_ALL_REPLY_NET);
4643         if (rc)
4644                 GOTO(err_free_hsm, rc);
4645
4646         rc = mdt_fs_setup(env, m, obd, lsi);
4647         if (rc)
4648                 GOTO(err_tgt, rc);
4649
4650         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4651
4652         next = m->mdt_child;
4653         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4654                                          &mntopts);
4655         if (rc)
4656                 GOTO(err_fs_cleanup, rc);
4657
4658         if (mntopts & MNTOPT_USERXATTR)
4659                 m->mdt_opts.mo_user_xattr = 1;
4660         else
4661                 m->mdt_opts.mo_user_xattr = 0;
4662
4663         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4664         if (rc)
4665                 GOTO(err_fs_cleanup, rc);
4666
4667         if (mntopts & MNTOPT_ACL)
4668                 m->mdt_opts.mo_acl = 1;
4669         else
4670                 m->mdt_opts.mo_acl = 0;
4671
4672         /* XXX: to support suppgid for ACL, we enable identity_upcall
4673          * by default, otherwise, maybe got unexpected -EACCESS. */
4674         if (m->mdt_opts.mo_acl)
4675                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4676
4677         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4678                                                 identity_upcall,
4679                                                 &mdt_identity_upcall_cache_ops);
4680         if (IS_ERR(m->mdt_identity_cache)) {
4681                 rc = PTR_ERR(m->mdt_identity_cache);
4682                 m->mdt_identity_cache = NULL;
4683                 GOTO(err_fs_cleanup, rc);
4684         }
4685
4686         rc = mdt_procfs_init(m, dev);
4687         if (rc) {
4688                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4689                 GOTO(err_recovery, rc);
4690         }
4691
4692         rc = mdt_quota_init(env, m, cfg);
4693         if (rc)
4694                 GOTO(err_procfs, rc);
4695
4696         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4697         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4698                            "mdt_ldlm_client", m->mdt_ldlm_client);
4699
4700         ping_evictor_start();
4701
4702         /* recovery will be started upon mdt_prepare()
4703          * when the whole stack is complete and ready
4704          * to serve the requests */
4705
4706         /* Reduce the initial timeout on an MDS because it doesn't need such
4707          * a long timeout as an OST does. Adaptive timeouts will adjust this
4708          * value appropriately. */
4709         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4710                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4711
4712         RETURN(0);
4713 err_procfs:
4714         mdt_procfs_fini(m);
4715 err_recovery:
4716         target_recovery_fini(obd);
4717         upcall_cache_cleanup(m->mdt_identity_cache);
4718         m->mdt_identity_cache = NULL;
4719 err_fs_cleanup:
4720         mdt_fs_cleanup(env, m);
4721 err_tgt:
4722         tgt_fini(env, &m->mdt_lut);
4723 err_free_hsm:
4724         mdt_hsm_cdt_fini(m);
4725 err_free_ns:
4726         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4727         obd->obd_namespace = m->mdt_namespace = NULL;
4728 err_fini_seq:
4729         mdt_seq_fini(env, m);
4730 err_fini_fld:
4731         mdt_fld_fini(env, m);
4732 err_fini_stack:
4733         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4734 err_lmi:
4735         if (lmi)
4736                 server_put_mount(dev, true);
4737         return(rc);
4738 }
4739
4740 /* For interoperability, the left element is old parameter, the right one
4741  * is the new version of the parameter, if some parameter is deprecated,
4742  * the new version should be set as NULL. */
4743 static struct cfg_interop_param mdt_interop_param[] = {
4744         { "mdt.group_upcall",   NULL },
4745         { "mdt.quota_type",     NULL },
4746         { "mdd.quota_type",     NULL },
4747         { "mdt.rootsquash",     "mdt.root_squash" },
4748         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4749         { NULL }
4750 };
4751
4752 /* used by MGS to process specific configurations */
4753 static int mdt_process_config(const struct lu_env *env,
4754                               struct lu_device *d, struct lustre_cfg *cfg)
4755 {
4756         struct mdt_device *m = mdt_dev(d);
4757         struct md_device *md_next = m->mdt_child;
4758         struct lu_device *next = md2lu_dev(md_next);
4759         int rc;
4760         ENTRY;
4761
4762         switch (cfg->lcfg_command) {
4763         case LCFG_PARAM: {
4764                 struct obd_device          *obd = d->ld_obd;
4765
4766                 /* For interoperability */
4767                 struct cfg_interop_param   *ptr = NULL;
4768                 struct lustre_cfg          *old_cfg = NULL;
4769                 char                       *param = NULL;
4770
4771                 param = lustre_cfg_string(cfg, 1);
4772                 if (param == NULL) {
4773                         CERROR("param is empty\n");
4774                         rc = -EINVAL;
4775                         break;
4776                 }
4777
4778                 ptr = class_find_old_param(param, mdt_interop_param);
4779                 if (ptr != NULL) {
4780                         if (ptr->new_param == NULL) {
4781                                 rc = 0;
4782                                 CWARN("For interoperability, skip this %s."
4783                                       " It is obsolete.\n", ptr->old_param);
4784                                 break;
4785                         }
4786
4787                         CWARN("Found old param %s, changed it to %s.\n",
4788                               ptr->old_param, ptr->new_param);
4789
4790                         old_cfg = cfg;
4791                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4792                         if (IS_ERR(cfg)) {
4793                                 rc = PTR_ERR(cfg);
4794                                 break;
4795                         }
4796                 }
4797
4798                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
4799                                               cfg, obd);
4800                 if (rc > 0 || rc == -ENOSYS) {
4801                         /* is it an HSM var ? */
4802                         rc = class_process_proc_param(PARAM_HSM,
4803                                                       hsm_cdt_get_proc_vars(),
4804                                                       cfg, obd);
4805                         if (rc > 0 || rc == -ENOSYS)
4806                                 /* we don't understand; pass it on */
4807                                 rc = next->ld_ops->ldo_process_config(env, next,
4808                                                                       cfg);
4809                 }
4810
4811                 if (old_cfg != NULL)
4812                         lustre_cfg_free(cfg);
4813
4814                 break;
4815         }
4816         default:
4817                 /* others are passed further */
4818                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4819                 break;
4820         }
4821         RETURN(rc);
4822 }
4823
4824 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4825                                           const struct lu_object_header *hdr,
4826                                           struct lu_device *d)
4827 {
4828         struct mdt_object *mo;
4829
4830         ENTRY;
4831
4832         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4833         if (mo != NULL) {
4834                 struct lu_object *o;
4835                 struct lu_object_header *h;
4836
4837                 o = &mo->mot_obj;
4838                 h = &mo->mot_header;
4839                 lu_object_header_init(h);
4840                 lu_object_init(o, h, d);
4841                 lu_object_add_top(h, o);
4842                 o->lo_ops = &mdt_obj_ops;
4843                 spin_lock_init(&mo->mot_write_lock);
4844                 mutex_init(&mo->mot_lov_mutex);
4845                 init_rwsem(&mo->mot_open_sem);
4846                 RETURN(o);
4847         }
4848         RETURN(NULL);
4849 }
4850
4851 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4852                            const struct lu_object_conf *unused)
4853 {
4854         struct mdt_device *d = mdt_dev(o->lo_dev);
4855         struct lu_device  *under;
4856         struct lu_object  *below;
4857         int                rc = 0;
4858         ENTRY;
4859
4860         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4861                PFID(lu_object_fid(o)));
4862
4863         under = &d->mdt_child->md_lu_dev;
4864         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4865         if (below != NULL) {
4866                 lu_object_add(o, below);
4867         } else
4868                 rc = -ENOMEM;
4869
4870         RETURN(rc);
4871 }
4872
4873 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4874 {
4875         struct mdt_object *mo = mdt_obj(o);
4876         struct lu_object_header *h;
4877         ENTRY;
4878
4879         h = o->lo_header;
4880         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4881                PFID(lu_object_fid(o)));
4882
4883         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4884         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4885
4886         lu_object_fini(o);
4887         lu_object_header_fini(h);
4888         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4889
4890         EXIT;
4891 }
4892
4893 static int mdt_object_print(const struct lu_env *env, void *cookie,
4894                             lu_printer_t p, const struct lu_object *o)
4895 {
4896         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4897
4898         return (*p)(env, cookie,
4899                     LUSTRE_MDT_NAME"-object@%p(flags=%d, writecount=%d)",
4900                     mdto, mdto->mot_flags, mdto->mot_write_count);
4901 }
4902
4903 static int mdt_prepare(const struct lu_env *env,
4904                 struct lu_device *pdev,
4905                 struct lu_device *cdev)
4906 {
4907         struct mdt_device *mdt = mdt_dev(cdev);
4908         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4909         struct obd_device *obd = cdev->ld_obd;
4910         int rc;
4911
4912         ENTRY;
4913
4914         LASSERT(obd);
4915
4916         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4917         if (rc)
4918                 RETURN(rc);
4919
4920         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4921         if (rc)
4922                 RETURN(rc);
4923
4924         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4925         if (rc)
4926                 RETURN(rc);
4927
4928         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4929         /* The LFSCK instance is registered just now, so it must be there when
4930          * register the namespace to such instance. */
4931         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4932
4933         if (mdt->mdt_seq_site.ss_node_id == 0) {
4934                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4935                                                          &mdt->mdt_md_root_fid);
4936                 if (rc)
4937                         RETURN(rc);
4938         }
4939
4940         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4941
4942         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4943         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4944         LASSERT(obd->obd_no_conn);
4945         spin_lock(&obd->obd_dev_lock);
4946         obd->obd_no_conn = 0;
4947         spin_unlock(&obd->obd_dev_lock);
4948
4949         if (obd->obd_recovering == 0)
4950                 mdt_postrecov(env, mdt);
4951
4952         RETURN(rc);
4953 }
4954
4955 const struct lu_device_operations mdt_lu_ops = {
4956         .ldo_object_alloc   = mdt_object_alloc,
4957         .ldo_process_config = mdt_process_config,
4958         .ldo_prepare        = mdt_prepare,
4959 };
4960
4961 static const struct lu_object_operations mdt_obj_ops = {
4962         .loo_object_init    = mdt_object_init,
4963         .loo_object_free    = mdt_object_free,
4964         .loo_object_print   = mdt_object_print
4965 };
4966
4967 static int mdt_obd_set_info_async(const struct lu_env *env,
4968                                   struct obd_export *exp,
4969                                   __u32 keylen, void *key,
4970                                   __u32 vallen, void *val,
4971                                   struct ptlrpc_request_set *set)
4972 {
4973         int rc;
4974
4975         ENTRY;
4976
4977         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4978                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4979                 RETURN(rc);
4980         }
4981
4982         RETURN(0);
4983 }
4984
4985 /**
4986  * Match client and server connection feature flags.
4987  *
4988  * Compute the compatibility flags for a connection request based on
4989  * features mutually supported by client and server.
4990  *
4991  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4992  * must not be updated here, otherwise a partially initialized value may
4993  * be exposed. After the connection request is successfully processed,
4994  * the top-level MDT connect request handler atomically updates the export
4995  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4996  * reply. \see mdt_connect().
4997  *
4998  * \param exp   the obd_export associated with this client/target pair
4999  * \param mdt   the target device for the connection
5000  * \param data  stores data for this connect request
5001  *
5002  * \retval 0       success
5003  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
5004  * \retval -EBADE  client and server feature requirements are incompatible
5005  */
5006 static int mdt_connect_internal(struct obd_export *exp,
5007                                 struct mdt_device *mdt,
5008                                 struct obd_connect_data *data)
5009 {
5010         LASSERT(data != NULL);
5011
5012         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
5013         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
5014
5015         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5016             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
5017                 CWARN("%s: client %s does not support ibits lock, either "
5018                       "very old or an invalid client: flags "LPX64"\n",
5019                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
5020                       data->ocd_connect_flags);
5021                 return -EBADE;
5022         }
5023
5024         if (!mdt->mdt_opts.mo_acl)
5025                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
5026
5027         if (!mdt->mdt_opts.mo_user_xattr)
5028                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
5029
5030         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
5031                 data->ocd_brw_size = min(data->ocd_brw_size,
5032                                          (__u32)MD_MAX_BRW_SIZE);
5033                 if (data->ocd_brw_size == 0) {
5034                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
5035                                " ocd_version: %x ocd_grant: %d "
5036                                "ocd_index: %u ocd_brw_size is "
5037                                "unexpectedly zero, network data "
5038                                "corruption? Refusing connection of this"
5039                                " client\n",
5040                                mdt_obd_name(mdt),
5041                                exp->exp_client_uuid.uuid,
5042                                exp, data->ocd_connect_flags, data->ocd_version,
5043                                data->ocd_grant, data->ocd_index);
5044                         return -EPROTO;
5045                 }
5046         }
5047
5048         /* NB: Disregard the rule against updating
5049          * exp_connect_data.ocd_connect_flags in this case, since
5050          * tgt_client_new() needs to know if this is a lightweight
5051          * connection, and it is safe to expose this flag before
5052          * connection processing completes. */
5053         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
5054                 spin_lock(&exp->exp_lock);
5055                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
5056                 spin_unlock(&exp->exp_lock);
5057         }
5058
5059         data->ocd_version = LUSTRE_VERSION_CODE;
5060
5061         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
5062                 CWARN("%s: MDS requires FID support, but client not\n",
5063                       mdt_obd_name(mdt));
5064                 return -EBADE;
5065         }
5066
5067         if (OCD_HAS_FLAG(data, PINGLESS)) {
5068                 if (ptlrpc_pinger_suppress_pings()) {
5069                         spin_lock(&exp->exp_obd->obd_dev_lock);
5070                         list_del_init(&exp->exp_obd_chain_timed);
5071                         spin_unlock(&exp->exp_obd->obd_dev_lock);
5072                 } else {
5073                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
5074                 }
5075         }
5076
5077         data->ocd_max_easize = mdt->mdt_max_ea_size;
5078
5079         /* NB: Disregard the rule against updating
5080          * exp_connect_data.ocd_connect_flags in this case, since
5081          * tgt_client_new() needs to know if this is client supports
5082          * multiple modify RPCs, and it is safe to expose this flag before
5083          * connection processing completes. */
5084         if (data->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS) {
5085                 data->ocd_maxmodrpcs = max_mod_rpcs_per_client;
5086                 spin_lock(&exp->exp_lock);
5087                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_MULTIMODRPCS;
5088                 spin_unlock(&exp->exp_lock);
5089         }
5090
5091         return 0;
5092 }
5093
5094 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
5095                                    struct mdt_thread_info *info,
5096                                    struct mdt_file_data *mfd)
5097 {
5098         struct lu_context ses;
5099         int rc;
5100         ENTRY;
5101
5102         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
5103         if (rc)
5104                 RETURN(rc);
5105
5106         env->le_ses = &ses;
5107         lu_context_enter(&ses);
5108
5109         mdt_ucred(info)->uc_valid = UCRED_OLD;
5110         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
5111
5112         lu_context_exit(&ses);
5113         lu_context_fini(&ses);
5114         env->le_ses = NULL;
5115
5116         RETURN(rc);
5117 }
5118
5119 static int mdt_export_cleanup(struct obd_export *exp)
5120 {
5121         struct list_head         closing_list;
5122         struct mdt_export_data  *med = &exp->exp_mdt_data;
5123         struct obd_device       *obd = exp->exp_obd;
5124         struct mdt_device       *mdt;
5125         struct mdt_thread_info  *info;
5126         struct lu_env            env;
5127         struct mdt_file_data    *mfd, *n;
5128         int rc = 0;
5129         ENTRY;
5130
5131         INIT_LIST_HEAD(&closing_list);
5132         spin_lock(&med->med_open_lock);
5133         while (!list_empty(&med->med_open_head)) {
5134                 struct list_head *tmp = med->med_open_head.next;
5135                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
5136
5137                 /* Remove mfd handle so it can't be found again.
5138                  * We are consuming the mfd_list reference here. */
5139                 class_handle_unhash(&mfd->mfd_handle);
5140                 list_move_tail(&mfd->mfd_list, &closing_list);
5141         }
5142         spin_unlock(&med->med_open_lock);
5143         mdt = mdt_dev(obd->obd_lu_dev);
5144         LASSERT(mdt != NULL);
5145
5146         rc = lu_env_init(&env, LCT_MD_THREAD);
5147         if (rc)
5148                 RETURN(rc);
5149
5150         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5151         LASSERT(info != NULL);
5152         memset(info, 0, sizeof *info);
5153         info->mti_env = &env;
5154         info->mti_mdt = mdt;
5155         info->mti_exp = exp;
5156
5157         if (!list_empty(&closing_list)) {
5158                 struct md_attr *ma = &info->mti_attr;
5159
5160                 /* Close any open files (which may also cause orphan
5161                  * unlinking). */
5162                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
5163                         list_del_init(&mfd->mfd_list);
5164                         ma->ma_need = ma->ma_valid = 0;
5165
5166                         /* This file is being closed due to an eviction, it
5167                          * could have been modified and now dirty regarding to
5168                          * HSM archive, check this!
5169                          * The logic here is to mark a file dirty if there's a
5170                          * chance it was dirtied before the client was evicted,
5171                          * so that we don't have to wait for a release attempt
5172                          * before finding out the file was actually dirty and
5173                          * fail the release. Aggressively marking it dirty here
5174                          * will cause the policy engine to attempt to
5175                          * re-archive it; when rearchiving, we can compare the
5176                          * current version to the HSM data_version and make the
5177                          * archive request into a noop if it's not actually
5178                          * dirty.
5179                          */
5180                         if (mfd->mfd_mode & FMODE_WRITE)
5181                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
5182
5183                         /* Don't unlink orphan on failover umount, LU-184 */
5184                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
5185                                 ma->ma_valid = MA_FLAGS;
5186                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
5187                         }
5188                         mdt_mfd_close(info, mfd);
5189                 }
5190         }
5191         info->mti_mdt = NULL;
5192         /* cleanup client slot early */
5193         /* Do not erase record for recoverable client. */
5194         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
5195                 tgt_client_del(&env, exp);
5196         lu_env_fini(&env);
5197
5198         RETURN(rc);
5199 }
5200
5201 static inline void mdt_enable_slc(struct mdt_device *mdt)
5202 {
5203         if (mdt->mdt_lut.lut_sync_lock_cancel == NEVER_SYNC_ON_CANCEL)
5204                 mdt->mdt_lut.lut_sync_lock_cancel = BLOCKING_SYNC_ON_CANCEL;
5205 }
5206
5207 static inline void mdt_disable_slc(struct mdt_device *mdt)
5208 {
5209         if (mdt->mdt_lut.lut_sync_lock_cancel == BLOCKING_SYNC_ON_CANCEL)
5210                 mdt->mdt_lut.lut_sync_lock_cancel = NEVER_SYNC_ON_CANCEL;
5211 }
5212
5213 static int mdt_obd_disconnect(struct obd_export *exp)
5214 {
5215         int rc;
5216         ENTRY;
5217
5218         LASSERT(exp);
5219         class_export_get(exp);
5220
5221         if ((exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
5222             !(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)) {
5223                 struct mdt_device *mdt = mdt_dev(exp->exp_obd->obd_lu_dev);
5224
5225                 if (atomic_dec_and_test(&mdt->mdt_mds_mds_conns))
5226                         mdt_disable_slc(mdt);
5227         }
5228
5229         rc = server_disconnect_export(exp);
5230         if (rc != 0)
5231                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
5232
5233         rc = mdt_export_cleanup(exp);
5234         nodemap_del_member(exp);
5235         class_export_put(exp);
5236         RETURN(rc);
5237 }
5238
5239 /* mds_connect copy */
5240 static int mdt_obd_connect(const struct lu_env *env,
5241                            struct obd_export **exp, struct obd_device *obd,
5242                            struct obd_uuid *cluuid,
5243                            struct obd_connect_data *data,
5244                            void *localdata)
5245 {
5246         struct obd_export       *lexp;
5247         struct lustre_handle    conn = { 0 };
5248         struct mdt_device       *mdt;
5249         int                      rc;
5250         lnet_nid_t              *client_nid = localdata;
5251         ENTRY;
5252
5253         LASSERT(env != NULL);
5254         if (!exp || !obd || !cluuid)
5255                 RETURN(-EINVAL);
5256
5257         mdt = mdt_dev(obd->obd_lu_dev);
5258
5259         if ((data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
5260             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5261                 atomic_inc(&mdt->mdt_mds_mds_conns);
5262                 mdt_enable_slc(mdt);
5263         }
5264
5265         /*
5266          * first, check whether the stack is ready to handle requests
5267          * XXX: probably not very appropriate method is used now
5268          *      at some point we should find a better one
5269          */
5270         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
5271             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) &&
5272             !(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS)) {
5273                 rc = obd_get_info(env, mdt->mdt_child_exp,
5274                                   sizeof(KEY_OSP_CONNECTED),
5275                                   KEY_OSP_CONNECTED, NULL, NULL);
5276                 if (rc)
5277                         RETURN(-EAGAIN);
5278                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5279         }
5280
5281         rc = class_connect(&conn, obd, cluuid);
5282         if (rc)
5283                 RETURN(rc);
5284
5285         lexp = class_conn2export(&conn);
5286         LASSERT(lexp != NULL);
5287
5288         rc = nodemap_add_member(*client_nid, lexp);
5289         if (rc != 0 && rc != -EEXIST)
5290                 GOTO(out, rc);
5291
5292         rc = mdt_connect_internal(lexp, mdt, data);
5293         if (rc == 0) {
5294                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5295
5296                 LASSERT(lcd);
5297                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5298                 rc = tgt_client_new(env, lexp);
5299                 if (rc == 0)
5300                         mdt_export_stats_init(obd, lexp, localdata);
5301         }
5302 out:
5303         if (rc != 0) {
5304                 class_disconnect(lexp);
5305                 nodemap_del_member(lexp);
5306                 *exp = NULL;
5307         } else {
5308                 *exp = lexp;
5309                 /* Because we do not want this export to be evicted by pinger,
5310                  * let's not add this export to the timed chain list. */
5311                 if (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
5312                         spin_lock(&lexp->exp_obd->obd_dev_lock);
5313                         list_del_init(&lexp->exp_obd_chain_timed);
5314                         spin_unlock(&lexp->exp_obd->obd_dev_lock);
5315                 }
5316         }
5317
5318         RETURN(rc);
5319 }
5320
5321 static int mdt_obd_reconnect(const struct lu_env *env,
5322                              struct obd_export *exp, struct obd_device *obd,
5323                              struct obd_uuid *cluuid,
5324                              struct obd_connect_data *data,
5325                              void *localdata)
5326 {
5327         lnet_nid_t             *client_nid = localdata;
5328         int                     rc;
5329         ENTRY;
5330
5331         if (exp == NULL || obd == NULL || cluuid == NULL)
5332                 RETURN(-EINVAL);
5333
5334         rc = nodemap_add_member(*client_nid, exp);
5335         if (rc != 0 && rc != -EEXIST)
5336                 RETURN(rc);
5337
5338         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5339         if (rc == 0)
5340                 mdt_export_stats_init(obd, exp, localdata);
5341         else
5342                 nodemap_del_member(exp);
5343
5344         RETURN(rc);
5345 }
5346
5347 /* FIXME: Can we avoid using these two interfaces? */
5348 static int mdt_init_export(struct obd_export *exp)
5349 {
5350         struct mdt_export_data *med = &exp->exp_mdt_data;
5351         int                     rc;
5352         ENTRY;
5353
5354         INIT_LIST_HEAD(&med->med_open_head);
5355         spin_lock_init(&med->med_open_lock);
5356         mutex_init(&med->med_idmap_mutex);
5357         med->med_idmap = NULL;
5358         spin_lock(&exp->exp_lock);
5359         exp->exp_connecting = 1;
5360         spin_unlock(&exp->exp_lock);
5361
5362         /* self-export doesn't need client data and ldlm initialization */
5363         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5364                                      &exp->exp_client_uuid)))
5365                 RETURN(0);
5366
5367         rc = tgt_client_alloc(exp);
5368         if (rc)
5369                 GOTO(err, rc);
5370
5371         rc = ldlm_init_export(exp);
5372         if (rc)
5373                 GOTO(err_free, rc);
5374
5375         RETURN(rc);
5376
5377 err_free:
5378         tgt_client_free(exp);
5379 err:
5380         CERROR("%s: Failed to initialize export: rc = %d\n",
5381                exp->exp_obd->obd_name, rc);
5382         return rc;
5383 }
5384
5385 static int mdt_destroy_export(struct obd_export *exp)
5386 {
5387         ENTRY;
5388
5389         if (exp_connect_rmtclient(exp))
5390                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5391
5392         target_destroy_export(exp);
5393         /* destroy can be called from failed obd_setup, so
5394          * checking uuid is safer than obd_self_export */
5395         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5396                                      &exp->exp_client_uuid)))
5397                 RETURN(0);
5398
5399         ldlm_destroy_export(exp);
5400         tgt_client_free(exp);
5401
5402         LASSERT(list_empty(&exp->exp_outstanding_replies));
5403         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5404
5405         RETURN(0);
5406 }
5407
5408 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5409                    struct linkea_data *ldata)
5410 {
5411         int rc;
5412
5413         LASSERT(ldata->ld_buf->lb_buf != NULL);
5414
5415         if (!mdt_object_exists(mdt_obj))
5416                 return -ENODATA;
5417
5418         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5419                           ldata->ld_buf, XATTR_NAME_LINK);
5420         if (rc == -ERANGE) {
5421                 /* Buf was too small, figure out what we need. */
5422                 lu_buf_free(ldata->ld_buf);
5423                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5424                                   ldata->ld_buf, XATTR_NAME_LINK);
5425                 if (rc < 0)
5426                         return rc;
5427                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5428                 if (ldata->ld_buf->lb_buf == NULL)
5429                         return -ENOMEM;
5430                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5431                                   ldata->ld_buf, XATTR_NAME_LINK);
5432         }
5433         if (rc < 0)
5434                 return rc;
5435
5436         return linkea_init(ldata);
5437 }
5438
5439 /**
5440  * Given an MDT object, try to look up the full path to the object.
5441  * Part of the MDT layer implementation of lfs fid2path.
5442  *
5443  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5444  * \param[in]     obj   Object to do path lookup of
5445  * \param[in,out] fp    User-provided struct to store path information
5446  * \param[in]     root_fid Root FID of current path should reach
5447  *
5448  * \retval 0 Lookup successful, path information stored in fp
5449  * \retval -EAGAIN Lookup failed, usually because object is being moved
5450  * \retval negative errno if there was a problem
5451  */
5452 static int mdt_path_current(struct mdt_thread_info *info,
5453                             struct mdt_object *obj,
5454                             struct getinfo_fid2path *fp,
5455                             struct lu_fid *root_fid)
5456 {
5457         struct mdt_device       *mdt = info->mti_mdt;
5458         struct mdt_object       *mdt_obj;
5459         struct link_ea_header   *leh;
5460         struct link_ea_entry    *lee;
5461         struct lu_name          *tmpname = &info->mti_name;
5462         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5463         struct lu_buf           *buf = &info->mti_big_buf;
5464         char                    *ptr;
5465         int                     reclen;
5466         struct linkea_data      ldata = { NULL };
5467         int                     rc = 0;
5468         bool                    first = true;
5469         ENTRY;
5470
5471         /* temp buffer for path element, the buffer will be finally freed
5472          * in mdt_thread_info_fini */
5473         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5474         if (buf->lb_buf == NULL)
5475                 RETURN(-ENOMEM);
5476
5477         ldata.ld_buf = buf;
5478         ptr = fp->gf_u.gf_path + fp->gf_pathlen - 1;
5479         *ptr = 0;
5480         --ptr;
5481         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5482
5483         while (!lu_fid_eq(root_fid, &fp->gf_fid)) {
5484                 struct lu_buf           lmv_buf;
5485
5486                 if (!lu_fid_eq(root_fid, &mdt->mdt_md_root_fid) &&
5487                     lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid))
5488                         GOTO(out, rc = -ENOENT);
5489
5490                 mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5491                 if (IS_ERR(mdt_obj))
5492                         GOTO(out, rc = PTR_ERR(mdt_obj));
5493
5494                 if (!mdt_object_exists(mdt_obj)) {
5495                         mdt_object_put(info->mti_env, mdt_obj);
5496                         GOTO(out, rc = -ENOENT);
5497                 }
5498
5499                 if (mdt_object_remote(mdt_obj)) {
5500                         mdt_object_put(info->mti_env, mdt_obj);
5501                         GOTO(remote_out, rc = -EREMOTE);
5502                 }
5503
5504                 rc = mdt_links_read(info, mdt_obj, &ldata);
5505                 if (rc != 0) {
5506                         mdt_object_put(info->mti_env, mdt_obj);
5507                         GOTO(out, rc);
5508                 }
5509
5510                 leh = buf->lb_buf;
5511                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5512                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5513                 /* If set, use link #linkno for path lookup, otherwise use
5514                    link #0.  Only do this for the final path element. */
5515                 if (first && fp->gf_linkno < leh->leh_reccount) {
5516                         int count;
5517                         for (count = 0; count < fp->gf_linkno; count++) {
5518                                 lee = (struct link_ea_entry *)
5519                                      ((char *)lee + reclen);
5520                                 linkea_entry_unpack(lee, &reclen, tmpname,
5521                                                     tmpfid);
5522                         }
5523                         if (fp->gf_linkno < leh->leh_reccount - 1)
5524                                 /* indicate to user there are more links */
5525                                 fp->gf_linkno++;
5526                 }
5527
5528                 lmv_buf.lb_buf = info->mti_xattr_buf;
5529                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5530                 /* Check if it is slave stripes */
5531                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5532                                   &lmv_buf, XATTR_NAME_LMV);
5533                 mdt_object_put(info->mti_env, mdt_obj);
5534                 if (rc > 0) {
5535                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5536
5537                         /* For slave stripes, get its master */
5538                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5539                                 fp->gf_fid = *tmpfid;
5540                                 continue;
5541                         }
5542                 } else if (rc < 0 && rc != -ENODATA) {
5543                         GOTO(out, rc);
5544                 }
5545
5546                 rc = 0;
5547
5548                 /* Pack the name in the end of the buffer */
5549                 ptr -= tmpname->ln_namelen;
5550                 if (ptr - 1 <= fp->gf_u.gf_path)
5551                         GOTO(out, rc = -EOVERFLOW);
5552                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5553                 *(--ptr) = '/';
5554
5555                 /* keep the last resolved fid to the client, so the
5556                  * client will build the left path on another MDT for
5557                  * remote object */
5558                 fp->gf_fid = *tmpfid;
5559
5560                 first = false;
5561         }
5562
5563 remote_out:
5564         ptr++; /* skip leading / */
5565         memmove(fp->gf_u.gf_path, ptr,
5566                 fp->gf_u.gf_path + fp->gf_pathlen - ptr);
5567
5568 out:
5569         RETURN(rc);
5570 }
5571
5572 /**
5573  * Given an MDT object, use mdt_path_current to get the path.
5574  * Essentially a wrapper to retry mdt_path_current a set number of times
5575  * if -EAGAIN is returned (usually because an object is being moved).
5576  *
5577  * Part of the MDT layer implementation of lfs fid2path.
5578  *
5579  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5580  * \param[in]     obj   Object to do path lookup of
5581  * \param[in,out] fp    User-provided struct for arguments and to store path
5582  *                      information
5583  *
5584  * \retval 0 Lookup successful, path information stored in fp
5585  * \retval negative errno if there was a problem
5586  */
5587 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5588                     struct getinfo_fid2path *fp, struct lu_fid *root_fid)
5589 {
5590         struct mdt_device       *mdt = info->mti_mdt;
5591         int                     tries = 3;
5592         int                     rc = -EAGAIN;
5593         ENTRY;
5594
5595         if (fp->gf_pathlen < 3)
5596                 RETURN(-EOVERFLOW);
5597
5598         if (root_fid == NULL)
5599                 root_fid = &mdt->mdt_md_root_fid;
5600
5601         if (lu_fid_eq(root_fid, mdt_object_fid(obj))) {
5602                 fp->gf_u.gf_path[0] = '\0';
5603                 RETURN(0);
5604         }
5605
5606         /* Retry multiple times in case file is being moved */
5607         while (tries-- && rc == -EAGAIN)
5608                 rc = mdt_path_current(info, obj, fp, root_fid);
5609
5610         RETURN(rc);
5611 }
5612
5613 /**
5614  * Get the full path of the provided FID, as of changelog record recno.
5615  *
5616  * This checks sanity and looks up object for user provided FID
5617  * before calling the actual path lookup code.
5618  *
5619  * Part of the MDT layer implementation of lfs fid2path.
5620  *
5621  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5622  * \param[in,out] fp    User-provided struct for arguments and to store path
5623  *                      information
5624  *
5625  * \retval 0 Lookup successful, path information and recno stored in fp
5626  * \retval -ENOENT, object does not exist
5627  * \retval negative errno if there was a problem
5628  */
5629 static int mdt_fid2path(struct mdt_thread_info *info,
5630                         struct lu_fid *root_fid,
5631                         struct getinfo_fid2path *fp)
5632 {
5633         struct mdt_device *mdt = info->mti_mdt;
5634         struct mdt_object *obj;
5635         int    rc;
5636         ENTRY;
5637
5638         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5639                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5640
5641         if (!fid_is_sane(&fp->gf_fid))
5642                 RETURN(-EINVAL);
5643
5644         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5645                 CWARN("%s: "DFID" is invalid, sequence should be "
5646                       ">= "LPX64"\n", mdt_obd_name(mdt),
5647                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5648                 RETURN(-EINVAL);
5649         }
5650
5651         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5652         if (IS_ERR(obj)) {
5653                 rc = PTR_ERR(obj);
5654                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5655                        PFID(&fp->gf_fid), rc);
5656                 RETURN(rc);
5657         }
5658
5659         if (mdt_object_remote(obj))
5660                 rc = -EREMOTE;
5661         else if (!mdt_object_exists(obj))
5662                 rc = -ENOENT;
5663         else
5664                 rc = 0;
5665
5666         if (rc < 0) {
5667                 mdt_object_put(info->mti_env, obj);
5668                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5669                        PFID(&fp->gf_fid), rc);
5670                 RETURN(rc);
5671         }
5672
5673         rc = mdt_path(info, obj, fp, root_fid);
5674
5675         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5676                PFID(&fp->gf_fid), fp->gf_u.gf_path,
5677                fp->gf_recno, fp->gf_linkno);
5678
5679         mdt_object_put(info->mti_env, obj);
5680
5681         RETURN(rc);
5682 }
5683
5684 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key, int keylen,
5685                             void *val, int vallen)
5686 {
5687         struct getinfo_fid2path *fpout, *fpin;
5688         struct lu_fid *root_fid = NULL;
5689         int rc = 0;
5690
5691         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5692         fpout = val;
5693
5694         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5695                 lustre_swab_fid2path(fpin);
5696
5697         memcpy(fpout, fpin, sizeof(*fpin));
5698         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5699                 RETURN(-EINVAL);
5700
5701         if (keylen >= cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*fpin) +
5702                       sizeof(struct lu_fid)) {
5703                 /* client sent its root FID, which is normally fileset FID */
5704                 root_fid = fpin->gf_u.gf_root_fid;
5705                 if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5706                         lustre_swab_lu_fid(root_fid);
5707
5708                 if (root_fid != NULL && !fid_is_sane(root_fid))
5709                         RETURN(-EINVAL);
5710         }
5711
5712         rc = mdt_fid2path(info, root_fid, fpout);
5713         RETURN(rc);
5714 }
5715
5716 int mdt_get_info(struct tgt_session_info *tsi)
5717 {
5718         char    *key;
5719         int      keylen;
5720         __u32   *vallen;
5721         void    *valout;
5722         int      rc;
5723
5724         ENTRY;
5725
5726         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5727         if (key == NULL) {
5728                 CDEBUG(D_IOCTL, "No GETINFO key\n");
5729                 RETURN(err_serious(-EFAULT));
5730         }
5731         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5732                                       RCL_CLIENT);
5733
5734         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5735         if (vallen == NULL) {
5736                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
5737                                 tgt_name(tsi->tsi_tgt));
5738                 RETURN(err_serious(-EFAULT));
5739         }
5740
5741         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5742                              *vallen);
5743         rc = req_capsule_server_pack(tsi->tsi_pill);
5744         if (rc)
5745                 RETURN(err_serious(rc));
5746
5747         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5748         if (valout == NULL) {
5749                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
5750                                 tgt_name(tsi->tsi_tgt));
5751                 RETURN(err_serious(-EFAULT));
5752         }
5753
5754         if (KEY_IS(KEY_FID2PATH)) {
5755                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5756
5757                 rc = mdt_rpc_fid2path(info, key, keylen, valout, *vallen);
5758                 mdt_thread_info_fini(info);
5759         } else {
5760                 rc = -EINVAL;
5761         }
5762         RETURN(rc);
5763 }
5764
5765 /* Pass the ioc down */
5766 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5767                          unsigned int cmd, int len, void *data)
5768 {
5769         struct lu_context ioctl_session;
5770         struct md_device *next = mdt->mdt_child;
5771         int rc;
5772         ENTRY;
5773
5774         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5775         if (rc)
5776                 RETURN(rc);
5777         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5778         lu_context_enter(&ioctl_session);
5779         env->le_ses = &ioctl_session;
5780
5781         LASSERT(next->md_ops->mdo_iocontrol);
5782         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5783
5784         lu_context_exit(&ioctl_session);
5785         lu_context_fini(&ioctl_session);
5786         RETURN(rc);
5787 }
5788
5789 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5790 {
5791         struct obd_ioctl_data *data = karg;
5792         struct lu_fid *fid;
5793         __u64 version;
5794         struct mdt_object *obj;
5795         struct mdt_lock_handle  *lh;
5796         int rc;
5797         ENTRY;
5798
5799         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5800             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5801                 RETURN(-EINVAL);
5802
5803         fid = (struct lu_fid *)data->ioc_inlbuf1;
5804
5805         if (!fid_is_sane(fid))
5806                 RETURN(-EINVAL);
5807
5808         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5809
5810         lh = &mti->mti_lh[MDT_LH_PARENT];
5811         mdt_lock_reg_init(lh, LCK_CR);
5812
5813         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5814         if (IS_ERR(obj))
5815                 RETURN(PTR_ERR(obj));
5816
5817         if (mdt_object_remote(obj)) {
5818                 rc = -EREMOTE;
5819                 /**
5820                  * before calling version get the correct MDS should be
5821                  * fid, this is error to find remote object here
5822                  */
5823                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5824         } else if (!mdt_object_exists(obj)) {
5825                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5826                 rc = -ENOENT;
5827         } else {
5828                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5829                *(__u64 *)data->ioc_inlbuf2 = version;
5830                 rc = 0;
5831         }
5832         mdt_object_unlock_put(mti, obj, lh, 1);
5833         RETURN(rc);
5834 }
5835
5836 /* ioctls on obd dev */
5837 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5838                          void *karg, void __user *uarg)
5839 {
5840         struct lu_env      env;
5841         struct obd_device *obd = exp->exp_obd;
5842         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5843         struct dt_device  *dt = mdt->mdt_bottom;
5844         int rc;
5845
5846         ENTRY;
5847         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5848         rc = lu_env_init(&env, LCT_MD_THREAD);
5849         if (rc)
5850                 RETURN(rc);
5851
5852         switch (cmd) {
5853         case OBD_IOC_SYNC:
5854                 rc = mdt_device_sync(&env, mdt);
5855                 break;
5856         case OBD_IOC_SET_READONLY:
5857                 rc = dt->dd_ops->dt_ro(&env, dt);
5858                 break;
5859         case OBD_IOC_ABORT_RECOVERY:
5860                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5861                 obd->obd_abort_recovery = 1;
5862                 target_stop_recovery_thread(obd);
5863                 rc = 0;
5864                 break;
5865         case OBD_IOC_CHANGELOG_REG:
5866         case OBD_IOC_CHANGELOG_DEREG:
5867         case OBD_IOC_CHANGELOG_CLEAR:
5868                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5869                 break;
5870         case OBD_IOC_START_LFSCK: {
5871                 struct md_device *next = mdt->mdt_child;
5872                 struct obd_ioctl_data *data = karg;
5873                 struct lfsck_start_param lsp;
5874
5875                 if (unlikely(data == NULL)) {
5876                         rc = -EINVAL;
5877                         break;
5878                 }
5879
5880                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5881                 lsp.lsp_index_valid = 0;
5882                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5883                 break;
5884         }
5885         case OBD_IOC_STOP_LFSCK: {
5886                 struct md_device        *next = mdt->mdt_child;
5887                 struct obd_ioctl_data   *data = karg;
5888                 struct lfsck_stop        stop;
5889
5890                 stop.ls_status = LS_STOPPED;
5891                 /* Old lfsck utils may pass NULL @stop. */
5892                 if (data->ioc_inlbuf1 == NULL)
5893                         stop.ls_flags = 0;
5894                 else
5895                         stop.ls_flags =
5896                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5897
5898                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5899                 break;
5900         }
5901         case OBD_IOC_QUERY_LFSCK: {
5902                 struct md_device        *next = mdt->mdt_child;
5903                 struct obd_ioctl_data   *data = karg;
5904
5905                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0,
5906                                                  data->ioc_inlbuf1);
5907                 break;
5908         }
5909         case OBD_IOC_GET_OBJ_VERSION: {
5910                 struct mdt_thread_info *mti;
5911                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5912                 memset(mti, 0, sizeof *mti);
5913                 mti->mti_env = &env;
5914                 mti->mti_mdt = mdt;
5915                 mti->mti_exp = exp;
5916
5917                 rc = mdt_ioc_version_get(mti, karg);
5918                 break;
5919         }
5920         case OBD_IOC_CATLOGLIST: {
5921                 struct mdt_thread_info *mti;
5922
5923                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5924                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5925                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5926                                        &mti->mti_tmp_fid1);
5927                 break;
5928          }
5929         default:
5930                 rc = -EOPNOTSUPP;
5931                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5932                         mdt_obd_name(mdt), cmd, rc);
5933         }
5934
5935         lu_env_fini(&env);
5936         RETURN(rc);
5937 }
5938
5939 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5940 {
5941         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5942         int rc;
5943         ENTRY;
5944
5945         if (!mdt->mdt_skip_lfsck) {
5946                 struct lfsck_start_param lsp;
5947
5948                 lsp.lsp_start = NULL;
5949                 lsp.lsp_index_valid = 0;
5950                 rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
5951                                                            OBD_IOC_START_LFSCK,
5952                                                            0, &lsp);
5953                 if (rc != 0 && rc != -EALREADY)
5954                         CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
5955                               mdt_obd_name(mdt), rc);
5956         }
5957
5958         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5959         RETURN(rc);
5960 }
5961
5962 static int mdt_obd_postrecov(struct obd_device *obd)
5963 {
5964         struct lu_env env;
5965         int rc;
5966
5967         rc = lu_env_init(&env, LCT_MD_THREAD);
5968         if (rc)
5969                 RETURN(rc);
5970         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5971         lu_env_fini(&env);
5972         return rc;
5973 }
5974
5975 static struct obd_ops mdt_obd_device_ops = {
5976         .o_owner          = THIS_MODULE,
5977         .o_set_info_async = mdt_obd_set_info_async,
5978         .o_connect        = mdt_obd_connect,
5979         .o_reconnect      = mdt_obd_reconnect,
5980         .o_disconnect     = mdt_obd_disconnect,
5981         .o_init_export    = mdt_init_export,
5982         .o_destroy_export = mdt_destroy_export,
5983         .o_iocontrol      = mdt_iocontrol,
5984         .o_postrecov      = mdt_obd_postrecov,
5985 };
5986
5987 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5988                                          struct lu_device *d)
5989 {
5990         struct mdt_device *m = mdt_dev(d);
5991         ENTRY;
5992
5993         mdt_fini(env, m);
5994         RETURN(NULL);
5995 }
5996
5997 static struct lu_device *mdt_device_free(const struct lu_env *env,
5998                                          struct lu_device *d)
5999 {
6000         struct mdt_device *m = mdt_dev(d);
6001         ENTRY;
6002
6003         lu_device_fini(&m->mdt_lu_dev);
6004         OBD_FREE_PTR(m);
6005
6006         RETURN(NULL);
6007 }
6008
6009 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
6010                                           struct lu_device_type *t,
6011                                           struct lustre_cfg *cfg)
6012 {
6013         struct lu_device  *l;
6014         struct mdt_device *m;
6015
6016         OBD_ALLOC_PTR(m);
6017         if (m != NULL) {
6018                 int rc;
6019
6020                 l = &m->mdt_lu_dev;
6021                 rc = mdt_init0(env, m, t, cfg);
6022                 if (rc != 0) {
6023                         mdt_device_free(env, l);
6024                         l = ERR_PTR(rc);
6025                         return l;
6026                 }
6027         } else
6028                 l = ERR_PTR(-ENOMEM);
6029         return l;
6030 }
6031
6032 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
6033 LU_KEY_INIT(mdt, struct mdt_thread_info);
6034
6035 static void mdt_key_fini(const struct lu_context *ctx,
6036                          struct lu_context_key *key, void* data)
6037 {
6038         struct mdt_thread_info *info = data;
6039
6040         if (info->mti_big_lmm) {
6041                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
6042                 info->mti_big_lmm = NULL;
6043                 info->mti_big_lmmsize = 0;
6044         }
6045         OBD_FREE_PTR(info);
6046 }
6047
6048 /* context key: mdt_thread_key */
6049 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
6050
6051 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
6052 {
6053         return lu_ucred(info->mti_env);
6054 }
6055
6056 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
6057 {
6058         return lu_ucred_check(info->mti_env);
6059 }
6060
6061 /**
6062  * Enable/disable COS (Commit On Sharing).
6063  *
6064  * Set/Clear the COS flag in mdt options.
6065  *
6066  * \param mdt mdt device
6067  * \param val 0 disables COS, other values enable COS
6068  */
6069 void mdt_enable_cos(struct mdt_device *mdt, int val)
6070 {
6071         struct lu_env env;
6072         int rc;
6073
6074         mdt->mdt_opts.mo_cos = !!val;
6075         rc = lu_env_init(&env, LCT_LOCAL);
6076         if (unlikely(rc != 0)) {
6077                 CWARN("%s: lu_env initialization failed, cannot "
6078                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
6079                 return;
6080         }
6081         mdt_device_sync(&env, mdt);
6082         lu_env_fini(&env);
6083 }
6084
6085 /**
6086  * Check COS (Commit On Sharing) status.
6087  *
6088  * Return COS flag status.
6089  *
6090  * \param mdt mdt device
6091  */
6092 int mdt_cos_is_enabled(struct mdt_device *mdt)
6093 {
6094         return mdt->mdt_opts.mo_cos != 0;
6095 }
6096
6097 static struct lu_device_type_operations mdt_device_type_ops = {
6098         .ldto_device_alloc = mdt_device_alloc,
6099         .ldto_device_free  = mdt_device_free,
6100         .ldto_device_fini  = mdt_device_fini
6101 };
6102
6103 static struct lu_device_type mdt_device_type = {
6104         .ldt_tags     = LU_DEVICE_MD,
6105         .ldt_name     = LUSTRE_MDT_NAME,
6106         .ldt_ops      = &mdt_device_type_ops,
6107         .ldt_ctx_tags = LCT_MD_THREAD
6108 };
6109
6110 static int __init mdt_init(void)
6111 {
6112         int rc;
6113
6114         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
6115                  FID_NOBRACE_LEN + 1);
6116         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
6117                  FID_LEN + 1);
6118         rc = lu_kmem_init(mdt_caches);
6119         if (rc)
6120                 return rc;
6121
6122         rc = mds_mod_init();
6123         if (rc)
6124                 GOTO(lu_fini, rc);
6125
6126         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
6127                                  LUSTRE_MDT_NAME, &mdt_device_type);
6128         if (rc)
6129                 GOTO(mds_fini, rc);
6130 lu_fini:
6131         if (rc)
6132                 lu_kmem_fini(mdt_caches);
6133 mds_fini:
6134         if (rc)
6135                 mds_mod_exit();
6136         return rc;
6137 }
6138
6139 static void __exit mdt_exit(void)
6140 {
6141         class_unregister_type(LUSTRE_MDT_NAME);
6142         mds_mod_exit();
6143         lu_kmem_fini(mdt_caches);
6144 }
6145
6146 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
6147 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
6148 MODULE_VERSION(LUSTRE_VERSION_STRING);
6149 MODULE_LICENSE("GPL");
6150
6151 module_init(mdt_init);
6152 module_exit(mdt_exit);