lustre/mdt/mdt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_handler.c
  37  *
  38  * Lustre Metadata Target (mdt) request handler
  39  *
  40  * Author: Peter Braam <braam@clusterfs.com>
  41  * Author: Andreas Dilger <adilger@clusterfs.com>
  42  * Author: Phil Schwan <phil@clusterfs.com>
  43  * Author: Mike Shaver <shaver@clusterfs.com>
  44  * Author: Nikita Danilov <nikita@clusterfs.com>
  45  * Author: Huang Hua <huanghua@clusterfs.com>
  46  * Author: Yury Umanets <umka@clusterfs.com>
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_MDS
  50
  51 #include <linux/module.h>
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  */
  55 #include <obd_support.h>
  56 /* struct ptlrpc_request */
  57 #include <lustre_net.h>
  58 /* struct obd_export */
  59 #include <lustre_export.h>
  60 /* struct obd_device */
  61 #include <obd.h>
  62 /* lu2dt_dev() */
  63 #include <dt_object.h>
  64 #include <lustre_mds.h>
  65 #include <lustre_log.h>
  66 #include "mdt_internal.h"
  67 #include <lustre_acl.h>
  68 #include <lustre_param.h>
  69 #include <lustre_quota.h>
  70 #include <lustre_linkea.h>
  71 #include <lustre_lfsck.h>
  72
  73 mdl_mode_t mdt_mdl_lock_modes[] = {
  74         [LCK_MINMODE] = MDL_MINMODE,
  75         [LCK_EX]      = MDL_EX,
  76         [LCK_PW]      = MDL_PW,
  77         [LCK_PR]      = MDL_PR,
  78         [LCK_CW]      = MDL_CW,
  79         [LCK_CR]      = MDL_CR,
  80         [LCK_NL]      = MDL_NL,
  81         [LCK_GROUP]   = MDL_GROUP
  82 };
  83
  84 ldlm_mode_t mdt_dlm_lock_modes[] = {
  85         [MDL_MINMODE] = LCK_MINMODE,
  86         [MDL_EX]      = LCK_EX,
  87         [MDL_PW]      = LCK_PW,
  88         [MDL_PR]      = LCK_PR,
  89         [MDL_CW]      = LCK_CW,
  90         [MDL_CR]      = LCK_CR,
  91         [MDL_NL]      = LCK_NL,
  92         [MDL_GROUP]   = LCK_GROUP
  93 };
  94
  95 static struct mdt_device *mdt_dev(struct lu_device *d);
  96 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  97
  98 static const struct lu_object_operations mdt_obj_ops;
  99
 100 /* Slab for MDT object allocation */
 101 static struct kmem_cache *mdt_object_kmem;
 102
 103 /* For HSM restore handles */
 104 struct kmem_cache *mdt_hsm_cdt_kmem;
 105
 106 /* For HSM request handles */
 107 struct kmem_cache *mdt_hsm_car_kmem;
 108
 109 static struct lu_kmem_descr mdt_caches[] = {
 110         {
 111                 .ckd_cache = &mdt_object_kmem,
 112                 .ckd_name  = "mdt_obj",
 113                 .ckd_size  = sizeof(struct mdt_object)
 114         },
 115         {
 116                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 117                 .ckd_name       = "mdt_cdt_restore_handle",
 118                 .ckd_size       = sizeof(struct cdt_restore_handle)
 119         },
 120         {
 121                 .ckd_cache      = &mdt_hsm_car_kmem,
 122                 .ckd_name       = "mdt_cdt_agent_req",
 123                 .ckd_size       = sizeof(struct cdt_agent_req)
 124         },
 125         {
 126                 .ckd_cache = NULL
 127         }
 128 };
 129
 130 int mdt_get_disposition(struct ldlm_reply *rep, int flag)
 131 {
 132         if (!rep)
 133                 return 0;
 134         return (rep->lock_policy_res1 & flag);
 135 }
 136
 137 void mdt_clear_disposition(struct mdt_thread_info *info,
 138                            struct ldlm_reply *rep, int flag)
 139 {
 140         if (info)
 141                 info->mti_opdata &= ~flag;
 142         if (rep)
 143                 rep->lock_policy_res1 &= ~flag;
 144 }
 145
 146 void mdt_set_disposition(struct mdt_thread_info *info,
 147                          struct ldlm_reply *rep, int flag)
 148 {
 149         if (info)
 150                 info->mti_opdata |= flag;
 151         if (rep)
 152                 rep->lock_policy_res1 |= flag;
 153 }
 154
 155 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
 156 {
 157         lh->mlh_pdo_hash = 0;
 158         lh->mlh_reg_mode = lm;
 159         lh->mlh_rreg_mode = lm;
 160         lh->mlh_type = MDT_REG_LOCK;
 161 }
 162
 163 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lm,
 164                        const char *name, int namelen)
 165 {
 166         lh->mlh_reg_mode = lm;
 167         lh->mlh_rreg_mode = lm;
 168         lh->mlh_type = MDT_PDO_LOCK;
 169
 170         if (name != NULL && (name[0] != '\0')) {
 171                 LASSERT(namelen > 0);
 172                 lh->mlh_pdo_hash = full_name_hash(name, namelen);
 173                 /* XXX Workaround for LU-2856
 174                  * Zero is a valid return value of full_name_hash, but several
 175                  * users of mlh_pdo_hash assume a non-zero hash value. We
 176                  * therefore map zero onto an arbitrary, but consistent
 177                  * value (1) to avoid problems further down the road. */
 178                 if (unlikely(!lh->mlh_pdo_hash))
 179                         lh->mlh_pdo_hash = 1;
 180         } else {
 181                 LASSERT(namelen == 0);
 182                 lh->mlh_pdo_hash = 0ull;
 183         }
 184 }
 185
 186 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 187                               struct mdt_lock_handle *lh)
 188 {
 189         mdl_mode_t mode;
 190         ENTRY;
 191
 192         /*
 193          * Any dir access needs couple of locks:
 194          *
 195          * 1) on part of dir we gonna take lookup/modify;
 196          *
 197          * 2) on whole dir to protect it from concurrent splitting and/or to
 198          * flush client's cache for readdir().
 199          *
 200          * so, for a given mode and object this routine decides what lock mode
 201          * to use for lock #2:
 202          *
 203          * 1) if caller's gonna lookup in dir then we need to protect dir from
 204          * being splitted only - LCK_CR
 205          *
 206          * 2) if caller's gonna modify dir then we need to protect dir from
 207          * being splitted and to flush cache - LCK_CW
 208          *
 209          * 3) if caller's gonna modify dir and that dir seems ready for
 210          * splitting then we need to protect it from any type of access
 211          * (lookup/modify/split) - LCK_EX --bzzz
 212          */
 213
 214         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 215         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 216
 217         /*
 218          * Ask underlaying level its opinion about preferable PDO lock mode
 219          * having access type passed as regular lock mode:
 220          *
 221          * - MDL_MINMODE means that lower layer does not want to specify lock
 222          * mode;
 223          *
 224          * - MDL_NL means that no PDO lock should be taken. This is used in some
 225          * cases. Say, for non-splittable directories no need to use PDO locks
 226          * at all.
 227          */
 228         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 229                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 230
 231         if (mode != MDL_MINMODE) {
 232                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 233         } else {
 234                 /*
 235                  * Lower layer does not want to specify locking mode. We do it
 236                  * our selves. No special protection is needed, just flush
 237                  * client's cache on modification and allow concurrent
 238                  * mondification.
 239                  */
 240                 switch (lh->mlh_reg_mode) {
 241                 case LCK_EX:
 242                         lh->mlh_pdo_mode = LCK_EX;
 243                         break;
 244                 case LCK_PR:
 245                         lh->mlh_pdo_mode = LCK_CR;
 246                         break;
 247                 case LCK_PW:
 248                         lh->mlh_pdo_mode = LCK_CW;
 249                         break;
 250                 default:
 251                         CERROR("Not expected lock type (0x%x)\n",
 252                                (int)lh->mlh_reg_mode);
 253                         LBUG();
 254                 }
 255         }
 256
 257         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 258         EXIT;
 259 }
 260
 261 int mdt_getstatus(struct tgt_session_info *tsi)
 262 {
 263         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 264         struct mdt_device       *mdt = info->mti_mdt;
 265         struct mdt_body         *repbody;
 266         int                      rc;
 267
 268         ENTRY;
 269
 270         rc = mdt_check_ucred(info);
 271         if (rc)
 272                 GOTO(out, rc = err_serious(rc));
 273
 274         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
 275                 GOTO(out, rc = err_serious(-ENOMEM));
 276
 277         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 278         repbody->fid1 = mdt->mdt_md_root_fid;
 279         repbody->valid |= OBD_MD_FLID;
 280
 281         if (tsi->tsi_tgt->lut_mds_capa &&
 282             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
 283                 struct mdt_object       *root;
 284                 struct lustre_capa      *capa;
 285
 286                 root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
 287                 if (IS_ERR(root))
 288                         GOTO(out, rc = PTR_ERR(root));
 289
 290                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
 291                 LASSERT(capa);
 292                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 293                 rc = mo_capa_get(info->mti_env, mdt_object_child(root), capa,
 294                                  0);
 295                 mdt_object_put(info->mti_env, root);
 296                 if (rc == 0)
 297                         repbody->valid |= OBD_MD_FLMDSCAPA;
 298         }
 299         EXIT;
 300 out:
 301         mdt_thread_info_fini(info);
 302         return rc;
 303 }
 304
 305 int mdt_statfs(struct tgt_session_info *tsi)
 306 {
 307         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 308         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 309         struct md_device                *next = info->mti_mdt->mdt_child;
 310         struct ptlrpc_service_part      *svcpt;
 311         struct obd_statfs               *osfs;
 312         int                             rc;
 313
 314         ENTRY;
 315
 316         svcpt = req->rq_rqbd->rqbd_svcpt;
 317
 318         /* This will trigger a watchdog timeout */
 319         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 320                          (MDT_SERVICE_WATCHDOG_FACTOR *
 321                           at_get(&svcpt->scp_at_estimate)) + 1);
 322
 323         rc = mdt_check_ucred(info);
 324         if (rc)
 325                 GOTO(out, rc = err_serious(rc));
 326
 327         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 328                 GOTO(out, rc = err_serious(-ENOMEM));
 329
 330         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 331         if (!osfs)
 332                 GOTO(out, rc = -EPROTO);
 333
 334         /** statfs information are cached in the mdt_device */
 335         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 336                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 337                 /** statfs data is too old, get up-to-date one */
 338                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 339                 if (rc)
 340                         GOTO(out, rc);
 341                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 342                 info->mti_mdt->mdt_osfs = *osfs;
 343                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 344                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 345         } else {
 346                 /** use cached statfs data */
 347                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 348                 *osfs = info->mti_mdt->mdt_osfs;
 349                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 350         }
 351
 352         if (rc == 0)
 353                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 354 out:
 355         mdt_thread_info_fini(info);
 356         RETURN(rc);
 357 }
 358
 359 /**
 360  * Pack SOM attributes into the reply.
 361  * Call under a DLM UPDATE lock.
 362  */
 363 static void mdt_pack_size2body(struct mdt_thread_info *info,
 364                                struct mdt_object *mo)
 365 {
 366         struct mdt_body *b;
 367         struct md_attr *ma = &info->mti_attr;
 368
 369         LASSERT(ma->ma_attr.la_valid & LA_MODE);
 370         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 371
 372         /* Check if Size-on-MDS is supported, if this is a regular file,
 373          * if SOM is enabled on the object and if SOM cache exists and valid.
 374          * Otherwise do not pack Size-on-MDS attributes to the reply. */
 375         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
 376             !S_ISREG(ma->ma_attr.la_mode) ||
 377             !mdt_object_is_som_enabled(mo) ||
 378             !(ma->ma_valid & MA_SOM))
 379                 return;
 380
 381         b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 382         b->size = ma->ma_som->msd_size;
 383         b->blocks = ma->ma_som->msd_blocks;
 384 }
 385
 386 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 387                         const struct lu_attr *attr, const struct lu_fid *fid)
 388 {
 389         struct md_attr *ma = &info->mti_attr;
 390
 391         LASSERT(ma->ma_valid & MA_INODE);
 392
 393         b->atime      = attr->la_atime;
 394         b->mtime      = attr->la_mtime;
 395         b->ctime      = attr->la_ctime;
 396         b->mode       = attr->la_mode;
 397         b->size       = attr->la_size;
 398         b->blocks     = attr->la_blocks;
 399         b->uid        = attr->la_uid;
 400         b->gid        = attr->la_gid;
 401         b->flags      = attr->la_flags;
 402         b->nlink      = attr->la_nlink;
 403         b->rdev       = attr->la_rdev;
 404
 405         /*XXX should pack the reply body according to lu_valid*/
 406         b->valid |= OBD_MD_FLCTIME | OBD_MD_FLUID   |
 407                     OBD_MD_FLGID   | OBD_MD_FLTYPE  |
 408                     OBD_MD_FLMODE  | OBD_MD_FLNLINK | OBD_MD_FLFLAGS |
 409                     OBD_MD_FLATIME | OBD_MD_FLMTIME ;
 410
 411         if (!S_ISREG(attr->la_mode)) {
 412                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 413         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 414                 /* means no objects are allocated on osts. */
 415                 LASSERT(!(ma->ma_valid & MA_LOV));
 416                 /* just ignore blocks occupied by extend attributes on MDS */
 417                 b->blocks = 0;
 418                 /* if no object is allocated on osts, the size on mds is valid. b=22272 */
 419                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 420         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 421                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 422                 /* A released file stores its size on MDS. */
 423                 /* But return 1 block for released file, unless tools like tar
 424                  * will consider it fully sparse. (LU-3864)
 425                  */
 426                 if (unlikely(b->size == 0))
 427                         b->blocks = 0;
 428                 else
 429                         b->blocks = 1;
 430                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 431         }
 432
 433         if (fid) {
 434                 b->fid1 = *fid;
 435                 b->valid |= OBD_MD_FLID;
 436                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, size="LPU64"\n",
 437                                 PFID(fid), b->nlink, b->mode, b->size);
 438         }
 439
 440         if (info)
 441                 mdt_body_reverse_idmap(info, b);
 442
 443         if (fid != NULL && (b->valid & OBD_MD_FLSIZE))
 444                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 445                        PFID(fid), (unsigned long long)b->size);
 446 }
 447
 448 static inline int mdt_body_has_lov(const struct lu_attr *la,
 449                                    const struct mdt_body *body)
 450 {
 451         return ((S_ISREG(la->la_mode) && (body->valid & OBD_MD_FLEASIZE)) ||
 452                 (S_ISDIR(la->la_mode) && (body->valid & OBD_MD_FLDIREA )) );
 453 }
 454
 455 void mdt_client_compatibility(struct mdt_thread_info *info)
 456 {
 457         struct mdt_body       *body;
 458         struct ptlrpc_request *req = mdt_info_req(info);
 459         struct obd_export     *exp = req->rq_export;
 460         struct md_attr        *ma = &info->mti_attr;
 461         struct lu_attr        *la = &ma->ma_attr;
 462         ENTRY;
 463
 464         if (exp_connect_layout(exp))
 465                 /* the client can deal with 16-bit lmm_stripe_count */
 466                 RETURN_EXIT;
 467
 468         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 469
 470         if (!mdt_body_has_lov(la, body))
 471                 RETURN_EXIT;
 472
 473         /* now we have a reply with a lov for a client not compatible with the
 474          * layout lock so we have to clean the layout generation number */
 475         if (S_ISREG(la->la_mode))
 476                 ma->ma_lmm->lmm_layout_gen = 0;
 477         EXIT;
 478 }
 479
 480 static int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 481                              char *name)
 482 {
 483         const struct lu_env *env = info->mti_env;
 484         int rc;
 485         ENTRY;
 486
 487         LASSERT(info->mti_big_lmm_used == 0);
 488         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 489         if (rc < 0)
 490                 RETURN(rc);
 491
 492         /* big_lmm may need to be grown */
 493         if (info->mti_big_lmmsize < rc) {
 494                 int size = size_roundup_power2(rc);
 495
 496                 if (info->mti_big_lmmsize > 0) {
 497                         /* free old buffer */
 498                         LASSERT(info->mti_big_lmm);
 499                         OBD_FREE_LARGE(info->mti_big_lmm,
 500                                        info->mti_big_lmmsize);
 501                         info->mti_big_lmm = NULL;
 502                         info->mti_big_lmmsize = 0;
 503                 }
 504
 505                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 506                 if (info->mti_big_lmm == NULL)
 507                         RETURN(-ENOMEM);
 508                 info->mti_big_lmmsize = size;
 509         }
 510         LASSERT(info->mti_big_lmmsize >= rc);
 511
 512         info->mti_buf.lb_buf = info->mti_big_lmm;
 513         info->mti_buf.lb_len = info->mti_big_lmmsize;
 514         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 515
 516         RETURN(rc);
 517 }
 518
 519 int mdt_attr_get_lov(struct mdt_thread_info *info,
 520                      struct mdt_object *o, struct md_attr *ma)
 521 {
 522         struct md_object *next = mdt_object_child(o);
 523         struct lu_buf    *buf = &info->mti_buf;
 524         int rc;
 525
 526         buf->lb_buf = ma->ma_lmm;
 527         buf->lb_len = ma->ma_lmm_size;
 528         rc = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_LOV);
 529         if (rc > 0) {
 530                 ma->ma_lmm_size = rc;
 531                 ma->ma_valid |= MA_LOV;
 532                 rc = 0;
 533         } else if (rc == -ENODATA) {
 534                 /* no LOV EA */
 535                 rc = 0;
 536         } else if (rc == -ERANGE) {
 537                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LOV);
 538                 if (rc > 0) {
 539                         info->mti_big_lmm_used = 1;
 540                         ma->ma_valid |= MA_LOV;
 541                         ma->ma_lmm = info->mti_big_lmm;
 542                         ma->ma_lmm_size = rc;
 543                         /* update mdt_max_mdsize so all clients
 544                          * will be aware about that */
 545                         if (info->mti_mdt->mdt_max_mdsize < rc)
 546                                 info->mti_mdt->mdt_max_mdsize = rc;
 547                         rc = 0;
 548                 }
 549         }
 550
 551         return rc;
 552 }
 553
 554 int mdt_attr_get_pfid(struct mdt_thread_info *info,
 555                       struct mdt_object *o, struct lu_fid *pfid)
 556 {
 557         struct lu_buf           *buf = &info->mti_buf;
 558         struct link_ea_header   *leh;
 559         struct link_ea_entry    *lee;
 560         int                      rc;
 561         ENTRY;
 562
 563         buf->lb_buf = info->mti_big_lmm;
 564         buf->lb_len = info->mti_big_lmmsize;
 565         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 566                           buf, XATTR_NAME_LINK);
 567         /* ignore errors, MA_PFID won't be set and it is
 568          * up to the caller to treat this as an error */
 569         if (rc == -ERANGE || buf->lb_len == 0) {
 570                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 571                 buf->lb_buf = info->mti_big_lmm;
 572                 buf->lb_len = info->mti_big_lmmsize;
 573         }
 574
 575         if (rc < 0)
 576                 RETURN(rc);
 577         if (rc < sizeof(*leh)) {
 578                 CERROR("short LinkEA on "DFID": rc = %d\n",
 579                        PFID(mdt_object_fid(o)), rc);
 580                 RETURN(-ENODATA);
 581         }
 582
 583         leh = (struct link_ea_header *) buf->lb_buf;
 584         lee = (struct link_ea_entry *)(leh + 1);
 585         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 586                 leh->leh_magic = LINK_EA_MAGIC;
 587                 leh->leh_reccount = __swab32(leh->leh_reccount);
 588                 leh->leh_len = __swab64(leh->leh_len);
 589         }
 590         if (leh->leh_magic != LINK_EA_MAGIC)
 591                 RETURN(-EINVAL);
 592         if (leh->leh_reccount == 0)
 593                 RETURN(-ENODATA);
 594
 595         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 596         fid_be_to_cpu(pfid, pfid);
 597
 598         RETURN(0);
 599 }
 600
 601 int mdt_attr_get_complex(struct mdt_thread_info *info,
 602                          struct mdt_object *o, struct md_attr *ma)
 603 {
 604         const struct lu_env *env = info->mti_env;
 605         struct md_object    *next = mdt_object_child(o);
 606         struct lu_buf       *buf = &info->mti_buf;
 607         u32                  mode = lu_object_attr(&next->mo_lu);
 608         int                  need = ma->ma_need;
 609         int                  rc = 0, rc2;
 610         ENTRY;
 611
 612         ma->ma_valid = 0;
 613
 614         if (need & MA_INODE) {
 615                 ma->ma_need = MA_INODE;
 616                 rc = mo_attr_get(env, next, ma);
 617                 if (rc)
 618                         GOTO(out, rc);
 619                 ma->ma_valid |= MA_INODE;
 620         }
 621
 622         if (need & MA_PFID) {
 623                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 624                 if (rc == 0)
 625                         ma->ma_valid |= MA_PFID;
 626                 /* ignore this error, parent fid is not mandatory */
 627                 rc = 0;
 628         }
 629
 630         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 631                 rc = mdt_attr_get_lov(info, o, ma);
 632                 if (rc)
 633                         GOTO(out, rc);
 634         }
 635
 636         if (need & MA_LMV && S_ISDIR(mode)) {
 637                 buf->lb_buf = ma->ma_lmv;
 638                 buf->lb_len = ma->ma_lmv_size;
 639                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_LMV);
 640                 if (rc2 > 0) {
 641                         ma->ma_lmv_size = rc2;
 642                         ma->ma_valid |= MA_LMV;
 643                 } else if (rc2 == -ENODATA) {
 644                         /* no LMV EA */
 645                         ma->ma_lmv_size = 0;
 646                 } else
 647                         GOTO(out, rc = rc2);
 648         }
 649
 650         if (need & MA_SOM && S_ISREG(mode)) {
 651                 buf->lb_buf = info->mti_xattr_buf;
 652                 buf->lb_len = sizeof(info->mti_xattr_buf);
 653                 CLASSERT(sizeof(struct som_attrs) <=
 654                          sizeof(info->mti_xattr_buf));
 655                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_SOM);
 656                 rc2 = lustre_buf2som(info->mti_xattr_buf, rc2, ma->ma_som);
 657                 if (rc2 == 0)
 658                         ma->ma_valid |= MA_SOM;
 659                 else if (rc2 < 0 && rc2 != -ENODATA)
 660                         GOTO(out, rc = rc2);
 661         }
 662
 663         if (need & MA_HSM && S_ISREG(mode)) {
 664                 buf->lb_buf = info->mti_xattr_buf;
 665                 buf->lb_len = sizeof(info->mti_xattr_buf);
 666                 CLASSERT(sizeof(struct hsm_attrs) <=
 667                          sizeof(info->mti_xattr_buf));
 668                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 669                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 670                 if (rc2 == 0)
 671                         ma->ma_valid |= MA_HSM;
 672                 else if (rc2 < 0 && rc2 != -ENODATA)
 673                         GOTO(out, rc = rc2);
 674         }
 675
 676 #ifdef CONFIG_FS_POSIX_ACL
 677         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 678                 buf->lb_buf = ma->ma_acl;
 679                 buf->lb_len = ma->ma_acl_size;
 680                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 681                 if (rc2 > 0) {
 682                         ma->ma_acl_size = rc2;
 683                         ma->ma_valid |= MA_ACL_DEF;
 684                 } else if (rc2 == -ENODATA) {
 685                         /* no ACLs */
 686                         ma->ma_acl_size = 0;
 687                 } else
 688                         GOTO(out, rc = rc2);
 689         }
 690 #endif
 691 out:
 692         ma->ma_need = need;
 693         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 694                rc, ma->ma_valid, ma->ma_lmm);
 695         RETURN(rc);
 696 }
 697
 698 static int mdt_getattr_internal(struct mdt_thread_info *info,
 699                                 struct mdt_object *o, int ma_need)
 700 {
 701         struct md_object        *next = mdt_object_child(o);
 702         const struct mdt_body   *reqbody = info->mti_body;
 703         struct ptlrpc_request   *req = mdt_info_req(info);
 704         struct md_attr          *ma = &info->mti_attr;
 705         struct lu_attr          *la = &ma->ma_attr;
 706         struct req_capsule      *pill = info->mti_pill;
 707         const struct lu_env     *env = info->mti_env;
 708         struct mdt_body         *repbody;
 709         struct lu_buf           *buffer = &info->mti_buf;
 710         int                     rc;
 711         int                     is_root;
 712         ENTRY;
 713
 714         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 715                 RETURN(err_serious(-ENOMEM));
 716
 717         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 718
 719         ma->ma_valid = 0;
 720
 721         if (mdt_object_remote(o)) {
 722                 /* This object is located on remote node.*/
 723                 /* Return -EIO for old client */
 724                 if (!mdt_is_dne_client(req->rq_export))
 725                         GOTO(out, rc = -EIO);
 726
 727                 repbody->fid1 = *mdt_object_fid(o);
 728                 repbody->valid = OBD_MD_FLID | OBD_MD_MDS;
 729                 GOTO(out, rc = 0);
 730         }
 731
 732         buffer->lb_len = reqbody->eadatasize;
 733         if (buffer->lb_len > 0)
 734                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 735         else
 736                 buffer->lb_buf = NULL;
 737
 738         /* If it is dir object and client require MEA, then we got MEA */
 739         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 740             reqbody->valid & OBD_MD_MEA) {
 741                 /* Assumption: MDT_MD size is enough for lmv size. */
 742                 ma->ma_lmv = buffer->lb_buf;
 743                 ma->ma_lmv_size = buffer->lb_len;
 744                 ma->ma_need = MA_LMV | MA_INODE;
 745         } else {
 746                 ma->ma_lmm = buffer->lb_buf;
 747                 ma->ma_lmm_size = buffer->lb_len;
 748                 ma->ma_need = MA_LOV | MA_INODE | MA_HSM;
 749         }
 750
 751         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 752             reqbody->valid & OBD_MD_FLDIREA  &&
 753             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 754                 /* get default stripe info for this dir. */
 755                 ma->ma_need |= MA_LOV_DEF;
 756         }
 757         ma->ma_need |= ma_need;
 758         if (ma->ma_need & MA_SOM)
 759                 ma->ma_som = &info->mti_u.som.data;
 760
 761         rc = mdt_attr_get_complex(info, o, ma);
 762         if (unlikely(rc)) {
 763                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 764                        mdt_obd_name(info->mti_mdt),
 765                        PFID(mdt_object_fid(o)), rc);
 766                 RETURN(rc);
 767         }
 768
 769         /* if file is released, check if a restore is running */
 770         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
 771             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
 772                 repbody->t_state = MS_RESTORE;
 773                 repbody->valid |= OBD_MD_TSTATE;
 774         }
 775
 776         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 777
 778         /* the Lustre protocol supposes to return default striping
 779          * on the user-visible root if explicitly requested */
 780         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 781             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 782                 struct lu_fid      rootfid;
 783                 struct mdt_object *root;
 784                 struct mdt_device *mdt = info->mti_mdt;
 785
 786                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 787                 if (rc)
 788                         RETURN(rc);
 789                 root = mdt_object_find(env, mdt, &rootfid);
 790                 if (IS_ERR(root))
 791                         RETURN(PTR_ERR(root));
 792                 rc = mdt_attr_get_lov(info, root, ma);
 793                 mdt_object_put(info->mti_env, root);
 794                 if (unlikely(rc)) {
 795                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 796                                mdt_obd_name(info->mti_mdt),
 797                                PFID(mdt_object_fid(o)), rc);
 798                         RETURN(rc);
 799                 }
 800         }
 801
 802         if (likely(ma->ma_valid & MA_INODE))
 803                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 804         else
 805                 RETURN(-EFAULT);
 806
 807         if (mdt_body_has_lov(la, reqbody)) {
 808                 if (ma->ma_valid & MA_LOV) {
 809                         LASSERT(ma->ma_lmm_size);
 810                         mdt_dump_lmm(D_INFO, ma->ma_lmm);
 811                         repbody->eadatasize = ma->ma_lmm_size;
 812                         if (S_ISDIR(la->la_mode))
 813                                 repbody->valid |= OBD_MD_FLDIREA;
 814                         else
 815                                 repbody->valid |= OBD_MD_FLEASIZE;
 816                 }
 817                 if (ma->ma_valid & MA_LMV) {
 818                         LASSERT(S_ISDIR(la->la_mode));
 819                         repbody->eadatasize = ma->ma_lmv_size;
 820                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 821                 }
 822         } else if (S_ISLNK(la->la_mode) &&
 823                    reqbody->valid & OBD_MD_LINKNAME) {
 824                 buffer->lb_buf = ma->ma_lmm;
 825                 /* eadatasize from client includes NULL-terminator, so
 826                  * there is no need to read it */
 827                 buffer->lb_len = reqbody->eadatasize - 1;
 828                 rc = mo_readlink(env, next, buffer);
 829                 if (unlikely(rc <= 0)) {
 830                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 831                                mdt_obd_name(info->mti_mdt),
 832                                PFID(mdt_object_fid(o)), rc);
 833                         rc = -EFAULT;
 834                 } else {
 835                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 836
 837                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 838                                 rc -= 2;
 839                         repbody->valid |= OBD_MD_LINKNAME;
 840                         /* we need to report back size with NULL-terminator
 841                          * because client expects that */
 842                         repbody->eadatasize = rc + 1;
 843                         if (repbody->eadatasize != reqbody->eadatasize)
 844                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 845                                        "on "DFID ", expected %d\n",
 846                                        mdt_obd_name(info->mti_mdt),
 847                                        rc, PFID(mdt_object_fid(o)),
 848                                        reqbody->eadatasize - 1);
 849                         /* NULL terminate */
 850                         ((char *)ma->ma_lmm)[rc] = 0;
 851
 852                         /* If the total CDEBUG() size is larger than a page, it
 853                          * will print a warning to the console, avoid this by
 854                          * printing just the last part of the symlink. */
 855                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
 856                                print_limit < rc ? "..." : "", print_limit,
 857                                (char *)ma->ma_lmm + rc - print_limit, rc);
 858                         rc = 0;
 859                 }
 860         }
 861
 862         if (reqbody->valid & OBD_MD_FLMODEASIZE) {
 863                 repbody->max_cookiesize = 0;
 864                 repbody->max_mdsize = info->mti_mdt->mdt_max_mdsize;
 865                 repbody->valid |= OBD_MD_FLMODEASIZE;
 866                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
 867                        "MAX_COOKIE to : %d:%d\n", repbody->max_mdsize,
 868                        repbody->max_cookiesize);
 869         }
 870
 871         if (exp_connect_rmtclient(info->mti_exp) &&
 872             reqbody->valid & OBD_MD_FLRMTPERM) {
 873                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
 874
 875                 /* mdt_getattr_lock only */
 876                 rc = mdt_pack_remote_perm(info, o, buf);
 877                 if (rc) {
 878                         repbody->valid &= ~OBD_MD_FLRMTPERM;
 879                         repbody->aclsize = 0;
 880                         RETURN(rc);
 881                 } else {
 882                         repbody->valid |= OBD_MD_FLRMTPERM;
 883                         repbody->aclsize = sizeof(struct mdt_remote_perm);
 884                 }
 885         }
 886 #ifdef CONFIG_FS_POSIX_ACL
 887         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
 888                  (reqbody->valid & OBD_MD_FLACL)) {
 889                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
 890                 buffer->lb_len = req_capsule_get_size(pill,
 891                                                       &RMF_ACL, RCL_SERVER);
 892                 if (buffer->lb_len > 0) {
 893                         rc = mo_xattr_get(env, next, buffer,
 894                                           XATTR_NAME_ACL_ACCESS);
 895                         if (rc < 0) {
 896                                 if (rc == -ENODATA) {
 897                                         repbody->aclsize = 0;
 898                                         repbody->valid |= OBD_MD_FLACL;
 899                                         rc = 0;
 900                                 } else if (rc == -EOPNOTSUPP) {
 901                                         rc = 0;
 902                                 } else {
 903                                         CERROR("%s: unable to read "DFID
 904                                                " ACL: rc = %d\n",
 905                                                mdt_obd_name(info->mti_mdt),
 906                                                PFID(mdt_object_fid(o)), rc);
 907                                 }
 908                         } else {
 909                                 repbody->aclsize = rc;
 910                                 repbody->valid |= OBD_MD_FLACL;
 911                                 rc = 0;
 912                         }
 913                 }
 914         }
 915 #endif
 916
 917         if (reqbody->valid & OBD_MD_FLMDSCAPA &&
 918             info->mti_mdt->mdt_lut.lut_mds_capa &&
 919             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
 920                 struct lustre_capa *capa;
 921
 922                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
 923                 LASSERT(capa);
 924                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
 925                 rc = mo_capa_get(env, next, capa, 0);
 926                 if (rc)
 927                         RETURN(rc);
 928                 repbody->valid |= OBD_MD_FLMDSCAPA;
 929         }
 930
 931 out:
 932         if (rc == 0)
 933                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
 934
 935         RETURN(rc);
 936 }
 937
 938 static int mdt_renew_capa(struct mdt_thread_info *info)
 939 {
 940         struct mdt_object  *obj = info->mti_object;
 941         struct mdt_body    *body;
 942         struct lustre_capa *capa, *c;
 943         int rc;
 944         ENTRY;
 945
 946         /* if object doesn't exist, or server has disabled capability,
 947          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
 948          * flag not set.
 949          */
 950         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
 951             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
 952                 RETURN(0);
 953
 954         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 955         LASSERT(body != NULL);
 956
 957         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
 958         LASSERT(c);
 959
 960         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
 961         LASSERT(capa);
 962
 963         *capa = *c;
 964         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
 965         if (rc == 0)
 966                 body->valid |= OBD_MD_FLOSSCAPA;
 967         RETURN(rc);
 968 }
 969
 970 int mdt_getattr(struct tgt_session_info *tsi)
 971 {
 972         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 973         struct mdt_object       *obj = info->mti_object;
 974         struct req_capsule      *pill = info->mti_pill;
 975         struct mdt_body         *reqbody;
 976         struct mdt_body         *repbody;
 977         mode_t                   mode;
 978         int rc, rc2;
 979         ENTRY;
 980
 981         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
 982         LASSERT(reqbody);
 983
 984         if (reqbody->valid & OBD_MD_FLOSSCAPA) {
 985                 rc = req_capsule_server_pack(pill);
 986                 if (unlikely(rc))
 987                         RETURN(err_serious(rc));
 988                 rc = mdt_renew_capa(info);
 989                 GOTO(out_shrink, rc);
 990         }
 991
 992         LASSERT(obj != NULL);
 993         LASSERT(lu_object_assert_exists(&obj->mot_obj));
 994
 995         mode = lu_object_attr(&obj->mot_obj);
 996
 997         /* old clients may not report needed easize, use max value then */
 998         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
 999                              reqbody->eadatasize == 0 ?
1000                              info->mti_mdt->mdt_max_mdsize :
1001                              reqbody->eadatasize);
1002
1003         rc = req_capsule_server_pack(pill);
1004         if (unlikely(rc != 0))
1005                 GOTO(out, rc = err_serious(rc));
1006
1007         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1008         LASSERT(repbody != NULL);
1009         repbody->eadatasize = 0;
1010         repbody->aclsize = 0;
1011
1012         if (reqbody->valid & OBD_MD_FLRMTPERM)
1013                 rc = mdt_init_ucred(info, reqbody);
1014         else
1015                 rc = mdt_check_ucred(info);
1016         if (unlikely(rc))
1017                 GOTO(out_shrink, rc);
1018
1019         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1020
1021         /*
1022          * Don't check capability at all, because rename might getattr for
1023          * remote obj, and at that time no capability is available.
1024          */
1025         mdt_set_capainfo(info, 1, &reqbody->fid1, BYPASS_CAPA);
1026         rc = mdt_getattr_internal(info, obj, 0);
1027         if (reqbody->valid & OBD_MD_FLRMTPERM)
1028                 mdt_exit_ucred(info);
1029         EXIT;
1030 out_shrink:
1031         mdt_client_compatibility(info);
1032         rc2 = mdt_fix_reply(info);
1033         if (rc == 0)
1034                 rc = rc2;
1035 out:
1036         mdt_thread_info_fini(info);
1037         return rc;
1038 }
1039
1040 int mdt_is_subdir(struct tgt_session_info *tsi)
1041 {
1042         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1043         struct mdt_object     *o = info->mti_object;
1044         struct req_capsule    *pill = info->mti_pill;
1045         const struct mdt_body *body = info->mti_body;
1046         struct mdt_body       *repbody;
1047         int                    rc;
1048         ENTRY;
1049
1050         LASSERT(o != NULL);
1051
1052         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1053
1054         /*
1055          * We save last checked parent fid to @repbody->fid1 for remote
1056          * directory case.
1057          */
1058         LASSERT(fid_is_sane(&body->fid2));
1059         LASSERT(mdt_object_exists(o) && !mdt_object_remote(o));
1060         rc = mdo_is_subdir(info->mti_env, mdt_object_child(o),
1061                            &body->fid2, &repbody->fid1);
1062         if (rc == 0 || rc == -EREMOTE)
1063                 repbody->valid |= OBD_MD_FLID;
1064
1065         mdt_thread_info_fini(info);
1066         RETURN(rc);
1067 }
1068
1069 int mdt_swap_layouts(struct tgt_session_info *tsi)
1070 {
1071         struct mdt_thread_info  *info;
1072         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1073         struct obd_export       *exp = req->rq_export;
1074         struct mdt_object       *o1, *o2, *o;
1075         struct mdt_lock_handle  *lh1, *lh2;
1076         struct mdc_swap_layouts *msl;
1077         int                      rc;
1078         ENTRY;
1079
1080         /* client does not support layout lock, so layout swaping
1081          * is disabled.
1082          * FIXME: there is a problem for old clients which don't support
1083          * layout lock yet. If those clients have already opened the file
1084          * they won't be notified at all so that old layout may still be
1085          * used to do IO. This can be fixed after file release is landed by
1086          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1087         if (!exp_connect_layout(exp))
1088                 RETURN(-EOPNOTSUPP);
1089
1090         info = tsi2mdt_info(tsi);
1091         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1092                 mdt_set_capainfo(info, 0, &info->mti_body->fid1,
1093                                  req_capsule_client_get(info->mti_pill,
1094                                                         &RMF_CAPA1));
1095
1096         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1097                 mdt_set_capainfo(info, 1, &info->mti_body->fid2,
1098                                  req_capsule_client_get(info->mti_pill,
1099                                                         &RMF_CAPA2));
1100
1101         o1 = info->mti_object;
1102         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1103                                 &info->mti_body->fid2);
1104         if (IS_ERR(o))
1105                 GOTO(out, rc = PTR_ERR(o));
1106
1107         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1108                 GOTO(put, rc = -ENOENT);
1109
1110         rc = lu_fid_cmp(&info->mti_body->fid1, &info->mti_body->fid2);
1111         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1112                 GOTO(put, rc);
1113
1114         if (rc < 0)
1115                 swap(o1, o2);
1116
1117         /* permission check. Make sure the calling process having permission
1118          * to write both files. */
1119         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1120                                 MAY_WRITE);
1121         if (rc < 0)
1122                 GOTO(put, rc);
1123
1124         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1125                                 MAY_WRITE);
1126         if (rc < 0)
1127                 GOTO(put, rc);
1128
1129         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1130         if (msl == NULL)
1131                 GOTO(put, rc = -EPROTO);
1132
1133         lh1 = &info->mti_lh[MDT_LH_NEW];
1134         mdt_lock_reg_init(lh1, LCK_EX);
1135         lh2 = &info->mti_lh[MDT_LH_OLD];
1136         mdt_lock_reg_init(lh2, LCK_EX);
1137
1138         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1139                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1140         if (rc < 0)
1141                 GOTO(put, rc);
1142
1143         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1144                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1145         if (rc < 0)
1146                 GOTO(unlock1, rc);
1147
1148         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1149                              mdt_object_child(o2), msl->msl_flags);
1150         GOTO(unlock2, rc);
1151 unlock2:
1152         mdt_object_unlock(info, o2, lh2, rc);
1153 unlock1:
1154         mdt_object_unlock(info, o1, lh1, rc);
1155 put:
1156         mdt_object_put(info->mti_env, o);
1157 out:
1158         mdt_thread_info_fini(info);
1159         RETURN(rc);
1160 }
1161
1162 static int mdt_raw_lookup(struct mdt_thread_info *info,
1163                           struct mdt_object *parent,
1164                           const struct lu_name *lname,
1165                           struct ldlm_reply *ldlm_rep)
1166 {
1167         struct md_object *next = mdt_object_child(info->mti_object);
1168         const struct mdt_body *reqbody = info->mti_body;
1169         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1170         struct mdt_body *repbody;
1171         int rc;
1172         ENTRY;
1173
1174         if (reqbody->valid != OBD_MD_FLID)
1175                 RETURN(0);
1176
1177         LASSERT(!info->mti_cross_ref);
1178
1179         /* Only got the fid of this obj by name */
1180         fid_zero(child_fid);
1181         rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1182                         &info->mti_spec);
1183 #if 0
1184         /* XXX is raw_lookup possible as intent operation? */
1185         if (rc != 0) {
1186                 if (rc == -ENOENT)
1187                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1188                 RETURN(rc);
1189         } else
1190                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1191
1192         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1193 #endif
1194         if (rc == 0) {
1195                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1196                 repbody->fid1 = *child_fid;
1197                 repbody->valid = OBD_MD_FLID;
1198         }
1199         RETURN(1);
1200 }
1201
1202 /*
1203  * UPDATE lock should be taken against parent, and be release before exit;
1204  * child_bits lock should be taken against child, and be returned back:
1205  *            (1)normal request should release the child lock;
1206  *            (2)intent request will grant the lock to client.
1207  */
1208 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1209                                  struct mdt_lock_handle *lhc,
1210                                  __u64 child_bits,
1211                                  struct ldlm_reply *ldlm_rep)
1212 {
1213         struct ptlrpc_request  *req       = mdt_info_req(info);
1214         struct mdt_body        *reqbody   = NULL;
1215         struct mdt_object      *parent    = info->mti_object;
1216         struct mdt_object      *child;
1217         struct md_object       *next      = mdt_object_child(parent);
1218         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1219         struct lu_name         *lname     = NULL;
1220         const char             *name      = NULL;
1221         int                     namelen   = 0;
1222         struct mdt_lock_handle *lhp       = NULL;
1223         struct ldlm_lock       *lock;
1224         struct ldlm_res_id     *res_id;
1225         int                     is_resent;
1226         int                     ma_need = 0;
1227         int                     rc;
1228
1229         ENTRY;
1230
1231         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1232         LASSERT(ergo(is_resent,
1233                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1234
1235         LASSERT(parent != NULL);
1236         name = req_capsule_client_get(info->mti_pill, &RMF_NAME);
1237         if (name == NULL)
1238                 RETURN(err_serious(-EFAULT));
1239
1240         namelen = req_capsule_get_size(info->mti_pill, &RMF_NAME,
1241                                        RCL_CLIENT) - 1;
1242         if (!info->mti_cross_ref) {
1243                 /*
1244                  * XXX: Check for "namelen == 0" is for getattr by fid
1245                  * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
1246                  * that is the name must contain at least one character and
1247                  * the terminating '\0'
1248                  */
1249                 if (namelen == 0) {
1250                         reqbody = req_capsule_client_get(info->mti_pill,
1251                                                          &RMF_MDT_BODY);
1252                         if (unlikely(reqbody == NULL))
1253                                 RETURN(err_serious(-EFAULT));
1254
1255                         if (unlikely(!fid_is_sane(&reqbody->fid2)))
1256                                 RETURN(err_serious(-EINVAL));
1257
1258                         name = NULL;
1259                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1260                                "ldlm_rep = %p\n",
1261                                PFID(mdt_object_fid(parent)),
1262                                PFID(&reqbody->fid2), ldlm_rep);
1263                 } else {
1264                         lname = mdt_name(info->mti_env, (char *)name, namelen);
1265                         CDEBUG(D_INODE, "getattr with lock for "DFID"/%s, "
1266                                "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1267                                name, ldlm_rep);
1268                 }
1269         }
1270         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1271
1272         if (unlikely(!mdt_object_exists(parent)) && lname) {
1273                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1274                                 &parent->mot_obj,
1275                                 "Parent doesn't exist!\n");
1276                 RETURN(-ESTALE);
1277         } else if (!info->mti_cross_ref) {
1278                 LASSERTF(!mdt_object_remote(parent),
1279                          "Parent "DFID" is on remote server\n",
1280                          PFID(mdt_object_fid(parent)));
1281         }
1282         if (lname) {
1283                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1284                 if (rc != 0) {
1285                         if (rc > 0)
1286                                 rc = 0;
1287                         RETURN(rc);
1288                 }
1289         }
1290
1291         if (info->mti_cross_ref) {
1292                 /* Only getattr on the child. Parent is on another node. */
1293                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1294                 child = parent;
1295                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1296                        "ldlm_rep=%p\n", PFID(mdt_object_fid(child)), ldlm_rep);
1297
1298                 if (is_resent) {
1299                         /* Do not take lock for resent case. */
1300                         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1301                         LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1302                                  lhc->mlh_reg_lh.cookie);
1303                         LASSERT(fid_res_name_eq(mdt_object_fid(child),
1304                                                 &lock->l_resource->lr_name));
1305                         LDLM_LOCK_PUT(lock);
1306                         rc = 0;
1307                 } else {
1308                         mdt_lock_handle_init(lhc);
1309                         mdt_lock_reg_init(lhc, LCK_PR);
1310
1311                         /*
1312                          * Object's name is on another MDS, no lookup lock is
1313                          * needed here but update is.
1314                          */
1315                         child_bits &= ~MDS_INODELOCK_LOOKUP;
1316                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1317
1318                         rc = mdt_object_lock(info, child, lhc, child_bits,
1319                                              MDT_LOCAL_LOCK);
1320                 }
1321                 if (rc == 0) {
1322                         /* Finally, we can get attr for child. */
1323                         mdt_set_capainfo(info, 0, mdt_object_fid(child),
1324                                          BYPASS_CAPA);
1325                         rc = mdt_getattr_internal(info, child, 0);
1326                         if (unlikely(rc != 0))
1327                                 mdt_object_unlock(info, child, lhc, 1);
1328                 }
1329                 RETURN(rc);
1330         }
1331
1332         if (lname) {
1333                 /* step 1: lock parent only if parent is a directory */
1334                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1335                         lhp = &info->mti_lh[MDT_LH_PARENT];
1336                         mdt_lock_pdo_init(lhp, LCK_PR, name, namelen);
1337                         rc = mdt_object_lock(info, parent, lhp,
1338                                              MDS_INODELOCK_UPDATE,
1339                                              MDT_LOCAL_LOCK);
1340                         if (unlikely(rc != 0))
1341                                 RETURN(rc);
1342                 }
1343
1344                 /* step 2: lookup child's fid by name */
1345                 fid_zero(child_fid);
1346                 rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1347                                 &info->mti_spec);
1348
1349                 if (rc != 0) {
1350                         if (rc == -ENOENT)
1351                                 mdt_set_disposition(info, ldlm_rep,
1352                                                     DISP_LOOKUP_NEG);
1353                         GOTO(out_parent, rc);
1354                 } else
1355                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1356         } else {
1357                 *child_fid = reqbody->fid2;
1358                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1359         }
1360
1361         /*
1362          *step 3: find the child object by fid & lock it.
1363          *        regardless if it is local or remote.
1364          */
1365         child = mdt_object_find(info->mti_env, info->mti_mdt, child_fid);
1366
1367         if (unlikely(IS_ERR(child)))
1368                 GOTO(out_parent, rc = PTR_ERR(child));
1369         if (is_resent) {
1370                 /* Do not take lock for resent case. */
1371                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1372                 LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1373                          lhc->mlh_reg_lh.cookie);
1374
1375                 res_id = &lock->l_resource->lr_name;
1376                 if (!fid_res_name_eq(mdt_object_fid(child),
1377                                      &lock->l_resource->lr_name)) {
1378                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
1379                                                  &lock->l_resource->lr_name),
1380                                  "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1381                                  PLDLMRES(lock->l_resource),
1382                                  PFID(mdt_object_fid(parent)));
1383                         CWARN("Although resent, but still not get child lock"
1384                               "parent:"DFID" child:"DFID"\n",
1385                               PFID(mdt_object_fid(parent)),
1386                               PFID(mdt_object_fid(child)));
1387                         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1388                         LDLM_LOCK_PUT(lock);
1389                         GOTO(relock, 0);
1390                 }
1391                 LDLM_LOCK_PUT(lock);
1392                 rc = 0;
1393         } else {
1394                 bool try_layout = false;
1395
1396 relock:
1397                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1398                 mdt_lock_handle_init(lhc);
1399                 mdt_lock_reg_init(lhc, LCK_PR);
1400
1401                 if (!mdt_object_exists(child)) {
1402                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1403                                         &child->mot_obj,
1404                                         "Object doesn't exist!\n");
1405                         GOTO(out_child, rc = -ENOENT);
1406                 }
1407
1408                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1409                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1410                         struct md_attr *ma = &info->mti_attr;
1411
1412                         ma->ma_valid = 0;
1413                         ma->ma_need = MA_INODE;
1414                         rc = mdt_attr_get_complex(info, child, ma);
1415                         if (unlikely(rc != 0))
1416                                 GOTO(out_child, rc);
1417
1418                         /* If the file has not been changed for some time, we
1419                          * return not only a LOOKUP lock, but also an UPDATE
1420                          * lock and this might save us RPC on later STAT. For
1421                          * directories, it also let negative dentry cache start
1422                          * working for this dir. */
1423                         if (ma->ma_valid & MA_INODE &&
1424                             ma->ma_attr.la_valid & LA_CTIME &&
1425                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1426                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1427                                 child_bits |= MDS_INODELOCK_UPDATE;
1428                 }
1429
1430                 /* layout lock must be granted in a best-effort way
1431                  * for IT operations */
1432                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1433                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1434                     exp_connect_layout(info->mti_exp) &&
1435                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1436                     ldlm_rep != NULL) {
1437                         /* try to grant layout lock for regular file. */
1438                         try_layout = true;
1439                 }
1440
1441                 rc = 0;
1442                 if (try_layout) {
1443                         child_bits |= MDS_INODELOCK_LAYOUT;
1444                         /* try layout lock, it may fail to be granted due to
1445                          * contention at LOOKUP or UPDATE */
1446                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1447                                                  MDT_CROSS_LOCK)) {
1448                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1449                                 LASSERT(child_bits != 0);
1450                                 rc = mdt_object_lock(info, child, lhc,
1451                                                 child_bits, MDT_CROSS_LOCK);
1452                         } else {
1453                                 ma_need |= MA_LOV;
1454                         }
1455                 } else {
1456                         rc = mdt_object_lock(info, child, lhc, child_bits,
1457                                                 MDT_CROSS_LOCK);
1458                 }
1459                 if (unlikely(rc != 0))
1460                         GOTO(out_child, rc);
1461         }
1462
1463         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1464         /* Get MA_SOM attributes if update lock is given. */
1465         if (lock &&
1466             lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_UPDATE &&
1467             S_ISREG(lu_object_attr(&mdt_object_child(child)->mo_lu)))
1468                 ma_need |= MA_SOM;
1469
1470         /* finally, we can get attr for child. */
1471         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1472         rc = mdt_getattr_internal(info, child, ma_need);
1473         if (unlikely(rc != 0)) {
1474                 mdt_object_unlock(info, child, lhc, 1);
1475         } else if (lock) {
1476                 /* Debugging code. */
1477                 res_id = &lock->l_resource->lr_name;
1478                 LDLM_DEBUG(lock, "Returning lock to client");
1479                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1480                                          &lock->l_resource->lr_name),
1481                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1482                          PLDLMRES(lock->l_resource),
1483                          PFID(mdt_object_fid(child)));
1484                 if (mdt_object_exists(child) && !mdt_object_remote(child))
1485                         mdt_pack_size2body(info, child);
1486         }
1487         if (lock)
1488                 LDLM_LOCK_PUT(lock);
1489
1490         EXIT;
1491 out_child:
1492         mdt_object_put(info->mti_env, child);
1493 out_parent:
1494         if (lhp)
1495                 mdt_object_unlock(info, parent, lhp, 1);
1496         return rc;
1497 }
1498
1499 /* normal handler: should release the child lock */
1500 int mdt_getattr_name(struct tgt_session_info *tsi)
1501 {
1502         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1503         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1504         struct mdt_body        *reqbody;
1505         struct mdt_body        *repbody;
1506         int rc, rc2;
1507         ENTRY;
1508
1509         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1510         LASSERT(reqbody != NULL);
1511         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1512         LASSERT(repbody != NULL);
1513
1514         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1515         repbody->eadatasize = 0;
1516         repbody->aclsize = 0;
1517
1518         rc = mdt_init_ucred(info, reqbody);
1519         if (unlikely(rc))
1520                 GOTO(out_shrink, rc);
1521
1522         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1523         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1524                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1525                 lhc->mlh_reg_lh.cookie = 0;
1526         }
1527         mdt_exit_ucred(info);
1528         EXIT;
1529 out_shrink:
1530         mdt_client_compatibility(info);
1531         rc2 = mdt_fix_reply(info);
1532         if (rc == 0)
1533                 rc = rc2;
1534         mdt_thread_info_fini(info);
1535         return rc;
1536 }
1537
1538 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1539                          void *karg, void *uarg);
1540
1541 int mdt_set_info(struct tgt_session_info *tsi)
1542 {
1543         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1544         char                    *key;
1545         void                    *val;
1546         int                      keylen, vallen, rc = 0;
1547
1548         ENTRY;
1549
1550         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1551         if (key == NULL) {
1552                 DEBUG_REQ(D_HA, req, "no set_info key");
1553                 RETURN(err_serious(-EFAULT));
1554         }
1555
1556         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1557                                       RCL_CLIENT);
1558
1559         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1560         if (val == NULL) {
1561                 DEBUG_REQ(D_HA, req, "no set_info val");
1562                 RETURN(err_serious(-EFAULT));
1563         }
1564
1565         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1566                                       RCL_CLIENT);
1567
1568         /* Swab any part of val you need to here */
1569         if (KEY_IS(KEY_READ_ONLY)) {
1570                 spin_lock(&req->rq_export->exp_lock);
1571                 if (*(__u32 *)val)
1572                         *exp_connect_flags_ptr(req->rq_export) |=
1573                                 OBD_CONNECT_RDONLY;
1574                 else
1575                         *exp_connect_flags_ptr(req->rq_export) &=
1576                                 ~OBD_CONNECT_RDONLY;
1577                 spin_unlock(&req->rq_export->exp_lock);
1578         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1579                 struct changelog_setinfo *cs = val;
1580
1581                 if (vallen != sizeof(*cs)) {
1582                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1583                                tgt_name(tsi->tsi_tgt), vallen);
1584                         RETURN(-EINVAL);
1585                 }
1586                 if (ptlrpc_req_need_swab(req)) {
1587                         __swab64s(&cs->cs_recno);
1588                         __swab32s(&cs->cs_id);
1589                 }
1590
1591                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1592                                    vallen, val, NULL);
1593         } else {
1594                 RETURN(-EINVAL);
1595         }
1596         RETURN(rc);
1597 }
1598
1599 int mdt_readpage(struct tgt_session_info *tsi)
1600 {
1601         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1602         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1603         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1604         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1605         struct mdt_body         *repbody;
1606         int                      rc;
1607         int                      i;
1608
1609         ENTRY;
1610
1611         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1612                 RETURN(err_serious(-ENOMEM));
1613
1614         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1615         if (repbody == NULL || reqbody == NULL)
1616                 RETURN(err_serious(-EFAULT));
1617
1618         /*
1619          * prepare @rdpg before calling lower layers and transfer itself. Here
1620          * reqbody->size contains offset of where to start to read and
1621          * reqbody->nlink contains number bytes to read.
1622          */
1623         rdpg->rp_hash = reqbody->size;
1624         if (rdpg->rp_hash != reqbody->size) {
1625                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1626                        rdpg->rp_hash, reqbody->size);
1627                 RETURN(-EFAULT);
1628         }
1629
1630         rdpg->rp_attrs = reqbody->mode;
1631         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1632                 rdpg->rp_attrs |= LUDA_64BITHASH;
1633         rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
1634                                 exp_max_brw_size(tsi->tsi_exp));
1635         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1636                           PAGE_CACHE_SHIFT;
1637         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1638         if (rdpg->rp_pages == NULL)
1639                 RETURN(-ENOMEM);
1640
1641         for (i = 0; i < rdpg->rp_npages; ++i) {
1642                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1643                 if (rdpg->rp_pages[i] == NULL)
1644                         GOTO(free_rdpg, rc = -ENOMEM);
1645         }
1646
1647         /* call lower layers to fill allocated pages with directory data */
1648         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1649         if (rc < 0)
1650                 GOTO(free_rdpg, rc);
1651
1652         /* send pages to client */
1653         rc = tgt_sendpage(tsi, rdpg, rc);
1654
1655         EXIT;
1656 free_rdpg:
1657
1658         for (i = 0; i < rdpg->rp_npages; i++)
1659                 if (rdpg->rp_pages[i] != NULL)
1660                         __free_page(rdpg->rp_pages[i]);
1661         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1662
1663         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1664                 RETURN(0);
1665
1666         return rc;
1667 }
1668
1669 static int mdt_reint_internal(struct mdt_thread_info *info,
1670                               struct mdt_lock_handle *lhc,
1671                               __u32 op)
1672 {
1673         struct req_capsule      *pill = info->mti_pill;
1674         struct mdt_body         *repbody;
1675         int                      rc = 0, rc2;
1676
1677         ENTRY;
1678
1679         rc = mdt_reint_unpack(info, op);
1680         if (rc != 0) {
1681                 CERROR("Can't unpack reint, rc %d\n", rc);
1682                 RETURN(err_serious(rc));
1683         }
1684
1685         /* for replay (no_create) lmm is not needed, client has it already */
1686         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1687                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1688                                      info->mti_rr.rr_eadatalen);
1689
1690         /* llog cookies are always 0, the field is kept for compatibility */
1691         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1692                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1693
1694         rc = req_capsule_server_pack(pill);
1695         if (rc != 0) {
1696                 CERROR("Can't pack response, rc %d\n", rc);
1697                 RETURN(err_serious(rc));
1698         }
1699
1700         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1701                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1702                 LASSERT(repbody);
1703                 repbody->eadatasize = 0;
1704                 repbody->aclsize = 0;
1705         }
1706
1707         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1708
1709         /* for replay no cookkie / lmm need, because client have this already */
1710         if (info->mti_spec.no_create)
1711                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1712                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1713
1714         rc = mdt_init_ucred_reint(info);
1715         if (rc)
1716                 GOTO(out_shrink, rc);
1717
1718         rc = mdt_fix_attr_ucred(info, op);
1719         if (rc != 0)
1720                 GOTO(out_ucred, rc = err_serious(rc));
1721
1722         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1723                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1724                 GOTO(out_ucred, rc);
1725         }
1726         rc = mdt_reint_rec(info, lhc);
1727         EXIT;
1728 out_ucred:
1729         mdt_exit_ucred(info);
1730 out_shrink:
1731         mdt_client_compatibility(info);
1732         rc2 = mdt_fix_reply(info);
1733         if (rc == 0)
1734                 rc = rc2;
1735         return rc;
1736 }
1737
1738 static long mdt_reint_opcode(struct ptlrpc_request *req,
1739                              const struct req_format **fmt)
1740 {
1741         struct mdt_device       *mdt;
1742         struct mdt_rec_reint    *rec;
1743         long                     opc;
1744
1745         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1746         if (rec != NULL) {
1747                 opc = rec->rr_opcode;
1748                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1749                 if (opc < REINT_MAX && fmt[opc] != NULL)
1750                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1751                 else {
1752                         mdt = mdt_exp2dev(req->rq_export);
1753                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1754                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1755                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1756                         opc = err_serious(-EFAULT);
1757                 }
1758         } else {
1759                 opc = err_serious(-EFAULT);
1760         }
1761         return opc;
1762 }
1763
1764 int mdt_reint(struct tgt_session_info *tsi)
1765 {
1766         long opc;
1767         int  rc;
1768         static const struct req_format *reint_fmts[REINT_MAX] = {
1769                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1770                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1771                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1772                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1773                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1774                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1775                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1776                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK
1777         };
1778
1779         ENTRY;
1780
1781         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1782         if (opc >= 0) {
1783                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1784                 /*
1785                  * No lock possible here from client to pass it to reint code
1786                  * path.
1787                  */
1788                 rc = mdt_reint_internal(info, NULL, opc);
1789                 mdt_thread_info_fini(info);
1790         } else {
1791                 rc = opc;
1792         }
1793
1794         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1795         RETURN(rc);
1796 }
1797
1798 /* this should sync the whole device */
1799 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1800 {
1801         struct dt_device *dt = mdt->mdt_bottom;
1802         int rc;
1803         ENTRY;
1804
1805         rc = dt->dd_ops->dt_sync(env, dt);
1806         RETURN(rc);
1807 }
1808
1809 /* this should sync this object */
1810 static int mdt_object_sync(struct mdt_thread_info *info)
1811 {
1812         struct md_object *next;
1813         int rc;
1814         ENTRY;
1815
1816         if (!mdt_object_exists(info->mti_object)) {
1817                 CWARN("Non existing object  "DFID"!\n",
1818                       PFID(mdt_object_fid(info->mti_object)));
1819                 RETURN(-ESTALE);
1820         }
1821         next = mdt_object_child(info->mti_object);
1822         rc = mo_object_sync(info->mti_env, next);
1823
1824         RETURN(rc);
1825 }
1826
1827 int mdt_sync(struct tgt_session_info *tsi)
1828 {
1829         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1830         struct req_capsule      *pill = tsi->tsi_pill;
1831         struct mdt_body         *body;
1832         int                      rc;
1833
1834         ENTRY;
1835
1836         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1837                 RETURN(err_serious(-ENOMEM));
1838
1839         if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
1840                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1841         } else {
1842                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1843
1844                 /* sync an object */
1845                 rc = mdt_object_sync(info);
1846                 if (rc == 0) {
1847                         const struct lu_fid *fid;
1848                         struct lu_attr *la = &info->mti_attr.ma_attr;
1849
1850                         info->mti_attr.ma_need = MA_INODE;
1851                         info->mti_attr.ma_valid = 0;
1852                         rc = mdt_attr_get_complex(info, info->mti_object,
1853                                                   &info->mti_attr);
1854                         if (rc == 0) {
1855                                 body = req_capsule_server_get(pill,
1856                                                               &RMF_MDT_BODY);
1857                                 fid = mdt_object_fid(info->mti_object);
1858                                 mdt_pack_attr2body(info, body, la, fid);
1859                         }
1860                 }
1861                 mdt_thread_info_fini(info);
1862         }
1863         if (rc == 0)
1864                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1865
1866         RETURN(rc);
1867 }
1868
1869 /*
1870  * Handle quota control requests to consult current usage/limit, but also
1871  * to configure quota enforcement
1872  */
1873 int mdt_quotactl(struct tgt_session_info *tsi)
1874 {
1875         struct obd_export       *exp  = tsi->tsi_exp;
1876         struct req_capsule      *pill = tsi->tsi_pill;
1877         struct obd_quotactl     *oqctl, *repoqc;
1878         int                      id, rc;
1879         struct mdt_device       *mdt = mdt_exp2dev(exp);
1880         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1881         ENTRY;
1882
1883         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1884         if (oqctl == NULL)
1885                 RETURN(err_serious(-EPROTO));
1886
1887         rc = req_capsule_server_pack(pill);
1888         if (rc)
1889                 RETURN(err_serious(rc));
1890
1891         switch (oqctl->qc_cmd) {
1892         case Q_QUOTACHECK:
1893         case LUSTRE_Q_INVALIDATE:
1894         case LUSTRE_Q_FINVALIDATE:
1895         case Q_QUOTAON:
1896         case Q_QUOTAOFF:
1897         case Q_INITQUOTA:
1898                 /* deprecated, not used any more */
1899                 RETURN(-EOPNOTSUPP);
1900                 /* master quotactl */
1901         case Q_GETINFO:
1902         case Q_SETINFO:
1903         case Q_SETQUOTA:
1904         case Q_GETQUOTA:
1905                 if (qmt == NULL)
1906                         RETURN(-EOPNOTSUPP);
1907                 /* slave quotactl */
1908         case Q_GETOINFO:
1909         case Q_GETOQUOTA:
1910                 break;
1911         default:
1912                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1913                 RETURN(-EFAULT);
1914         }
1915
1916         /* map uid/gid for remote client */
1917         id = oqctl->qc_id;
1918         if (exp_connect_rmtclient(exp)) {
1919                 struct lustre_idmap_table *idmap;
1920
1921                 idmap = exp->exp_mdt_data.med_idmap;
1922
1923                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
1924                              oqctl->qc_cmd != Q_GETINFO))
1925                         RETURN(-EPERM);
1926
1927                 if (oqctl->qc_type == USRQUOTA)
1928                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
1929                                                      oqctl->qc_id);
1930                 else if (oqctl->qc_type == GRPQUOTA)
1931                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
1932                                                      oqctl->qc_id);
1933                 else
1934                         RETURN(-EINVAL);
1935
1936                 if (id == CFS_IDMAP_NOTFOUND) {
1937                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
1938                         RETURN(-EACCES);
1939                 }
1940         }
1941
1942         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
1943         if (repoqc == NULL)
1944                 RETURN(err_serious(-EFAULT));
1945
1946         if (oqctl->qc_id != id)
1947                 swap(oqctl->qc_id, id);
1948
1949         switch (oqctl->qc_cmd) {
1950
1951         case Q_GETINFO:
1952         case Q_SETINFO:
1953         case Q_SETQUOTA:
1954         case Q_GETQUOTA:
1955                 /* forward quotactl request to QMT */
1956                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
1957                 break;
1958
1959         case Q_GETOINFO:
1960         case Q_GETOQUOTA:
1961                 /* slave quotactl */
1962                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1963                                    oqctl);
1964                 break;
1965
1966         default:
1967                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1968                 RETURN(-EFAULT);
1969         }
1970
1971         if (oqctl->qc_id != id)
1972                 swap(oqctl->qc_id, id);
1973
1974         *repoqc = *oqctl;
1975         RETURN(rc);
1976 }
1977
1978 /** clone llog ctxt from child (mdd)
1979  * This allows remote llog (replicator) access.
1980  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
1981  * context was originally set up, or we can handle them directly.
1982  * I choose the latter, but that means I need any llog
1983  * contexts set up by child to be accessable by the mdt.  So we clone the
1984  * context into our context list here.
1985  */
1986 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
1987                                int idx)
1988 {
1989         struct md_device  *next = mdt->mdt_child;
1990         struct llog_ctxt *ctxt;
1991         int rc;
1992
1993         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
1994                 return 0;
1995
1996         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
1997         if (rc || ctxt == NULL) {
1998                 return 0;
1999         }
2000
2001         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2002         if (rc)
2003                 CERROR("Can't set mdt ctxt %d\n", rc);
2004
2005         return rc;
2006 }
2007
2008 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2009                                  struct mdt_device *mdt, int idx)
2010 {
2011         struct llog_ctxt *ctxt;
2012
2013         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2014         if (ctxt == NULL)
2015                 return 0;
2016         /* Put once for the get we just did, and once for the clone */
2017         llog_ctxt_put(ctxt);
2018         llog_ctxt_put(ctxt);
2019         return 0;
2020 }
2021
2022 /*
2023  * sec context handlers
2024  */
2025 int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2026 {
2027         int rc;
2028
2029         rc = mdt_handle_idmap(tsi);
2030         if (unlikely(rc)) {
2031                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2032                 __u32                    opc;
2033
2034                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2035                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2036                         sptlrpc_svc_ctx_invalidate(req);
2037         }
2038
2039         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2040
2041         return rc;
2042 }
2043
2044 /*
2045  * quota request handlers
2046  */
2047 int mdt_quota_dqacq(struct tgt_session_info *tsi)
2048 {
2049         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2050         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2051         int                      rc;
2052         ENTRY;
2053
2054         if (qmt == NULL)
2055                 RETURN(err_serious(-EOPNOTSUPP));
2056
2057         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2058         RETURN(rc);
2059 }
2060
2061 struct mdt_object *mdt_object_new(const struct lu_env *env,
2062                                   struct mdt_device *d,
2063                                   const struct lu_fid *f)
2064 {
2065         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2066         struct lu_object *o;
2067         struct mdt_object *m;
2068         ENTRY;
2069
2070         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2071         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2072         if (unlikely(IS_ERR(o)))
2073                 m = (struct mdt_object *)o;
2074         else
2075                 m = mdt_obj(o);
2076         RETURN(m);
2077 }
2078
2079 struct mdt_object *mdt_object_find(const struct lu_env *env,
2080                                    struct mdt_device *d,
2081                                    const struct lu_fid *f)
2082 {
2083         struct lu_object *o;
2084         struct mdt_object *m;
2085         ENTRY;
2086
2087         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2088         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2089         if (unlikely(IS_ERR(o)))
2090                 m = (struct mdt_object *)o;
2091         else
2092                 m = mdt_obj(o);
2093
2094         RETURN(m);
2095 }
2096
2097 /**
2098  * Asyncronous commit for mdt device.
2099  *
2100  * Pass asynchonous commit call down the MDS stack.
2101  *
2102  * \param env environment
2103  * \param mdt the mdt device
2104  */
2105 static void mdt_device_commit_async(const struct lu_env *env,
2106                                     struct mdt_device *mdt)
2107 {
2108         struct dt_device *dt = mdt->mdt_bottom;
2109         int rc;
2110
2111         rc = dt->dd_ops->dt_commit_async(env, dt);
2112         if (unlikely(rc != 0))
2113                 CWARN("async commit start failed with rc = %d", rc);
2114 }
2115
2116 /**
2117  * Mark the lock as "synchonous".
2118  *
2119  * Mark the lock to deffer transaction commit to the unlock time.
2120  *
2121  * \param lock the lock to mark as "synchonous"
2122  *
2123  * \see mdt_is_lock_sync
2124  * \see mdt_save_lock
2125  */
2126 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2127 {
2128         lock->l_ast_data = (void*)1;
2129 }
2130
2131 /**
2132  * Check whehter the lock "synchonous" or not.
2133  *
2134  * \param lock the lock to check
2135  * \retval 1 the lock is "synchonous"
2136  * \retval 0 the lock isn't "synchronous"
2137  *
2138  * \see mdt_set_lock_sync
2139  * \see mdt_save_lock
2140  */
2141 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2142 {
2143         return lock->l_ast_data != NULL;
2144 }
2145
2146 /**
2147  * Blocking AST for mdt locks.
2148  *
2149  * Starts transaction commit if in case of COS lock conflict or
2150  * deffers such a commit to the mdt_save_lock.
2151  *
2152  * \param lock the lock which blocks a request or cancelling lock
2153  * \param desc unused
2154  * \param data unused
2155  * \param flag indicates whether this cancelling or blocking callback
2156  * \retval 0
2157  * \see ldlm_blocking_ast_nocheck
2158  */
2159 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2160                      void *data, int flag)
2161 {
2162         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2163         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2164         int rc;
2165         ENTRY;
2166
2167         if (flag == LDLM_CB_CANCELING)
2168                 RETURN(0);
2169         lock_res_and_lock(lock);
2170         if (lock->l_blocking_ast != mdt_blocking_ast) {
2171                 unlock_res_and_lock(lock);
2172                 RETURN(0);
2173         }
2174         if (mdt_cos_is_enabled(mdt) &&
2175             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2176             lock->l_blocking_lock != NULL &&
2177             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2178                 mdt_set_lock_sync(lock);
2179         }
2180         rc = ldlm_blocking_ast_nocheck(lock);
2181
2182         /* There is no lock conflict if l_blocking_lock == NULL,
2183          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2184          * when the last reference to a local lock was released */
2185         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2186                 struct lu_env env;
2187
2188                 rc = lu_env_init(&env, LCT_LOCAL);
2189                 if (unlikely(rc != 0))
2190                         CWARN("lu_env initialization failed with rc = %d,"
2191                               "cannot start asynchronous commit\n", rc);
2192                 else
2193                         mdt_device_commit_async(&env, mdt);
2194                 lu_env_fini(&env);
2195         }
2196         RETURN(rc);
2197 }
2198
2199 int mdt_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2200                         void *data, int flag)
2201 {
2202         struct lustre_handle lockh;
2203         int               rc;
2204
2205         switch (flag) {
2206         case LDLM_CB_BLOCKING:
2207                 ldlm_lock2handle(lock, &lockh);
2208                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2209                 if (rc < 0) {
2210                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2211                         RETURN(rc);
2212                 }
2213                 break;
2214         case LDLM_CB_CANCELING:
2215                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2216                 break;
2217         default:
2218                 LBUG();
2219         }
2220         RETURN(0);
2221 }
2222
2223 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2224                            struct mdt_object *o, struct lustre_handle *lh,
2225                            ldlm_mode_t mode, __u64 ibits)
2226 {
2227         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2228         ldlm_policy_data_t *policy = &mti->mti_policy;
2229         int rc = 0;
2230         ENTRY;
2231
2232         LASSERT(mdt_object_remote(o));
2233
2234         LASSERT(ibits & MDS_INODELOCK_UPDATE);
2235
2236         memset(einfo, 0, sizeof(*einfo));
2237         einfo->ei_type = LDLM_IBITS;
2238         einfo->ei_mode = mode;
2239         einfo->ei_cb_bl = mdt_md_blocking_ast;
2240         einfo->ei_cb_cp = ldlm_completion_ast;
2241
2242         memset(policy, 0, sizeof(*policy));
2243         policy->l_inodebits.bits = ibits;
2244
2245         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2246                             policy);
2247         RETURN(rc);
2248 }
2249
2250 static int mdt_object_lock0(struct mdt_thread_info *info, struct mdt_object *o,
2251                             struct mdt_lock_handle *lh, __u64 ibits,
2252                             bool nonblock, int locality)
2253 {
2254         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2255         ldlm_policy_data_t *policy = &info->mti_policy;
2256         struct ldlm_res_id *res_id = &info->mti_res_id;
2257         __u64 dlmflags;
2258         int rc;
2259         ENTRY;
2260
2261         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2262         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2263         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2264         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2265
2266         if (mdt_object_remote(o)) {
2267                 if (locality == MDT_CROSS_LOCK) {
2268                         ibits &= ~(MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM);
2269                         ibits |= MDS_INODELOCK_LOOKUP;
2270                 } else {
2271                         LASSERTF(!(ibits &
2272                                   (MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM)),
2273                                 "%s: wrong bit "LPX64" for remote obj "DFID"\n",
2274                                 mdt_obd_name(info->mti_mdt), ibits,
2275                                 PFID(mdt_object_fid(o)));
2276                         LASSERT(ibits & MDS_INODELOCK_LOOKUP);
2277                 }
2278                 /* No PDO lock on remote object */
2279                 LASSERT(lh->mlh_type != MDT_PDO_LOCK);
2280         }
2281
2282         if (lh->mlh_type == MDT_PDO_LOCK) {
2283                 /* check for exists after object is locked */
2284                 if (mdt_object_exists(o) == 0) {
2285                         /* Non-existent object shouldn't have PDO lock */
2286                         RETURN(-ESTALE);
2287                 } else {
2288                         /* Non-dir object shouldn't have PDO lock */
2289                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2290                                 RETURN(-ENOTDIR);
2291                 }
2292         }
2293
2294         memset(policy, 0, sizeof(*policy));
2295         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2296
2297         dlmflags = LDLM_FL_ATOMIC_CB;
2298         if (nonblock)
2299                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2300
2301         /*
2302          * Take PDO lock on whole directory and build correct @res_id for lock
2303          * on part of directory.
2304          */
2305         if (lh->mlh_pdo_hash != 0) {
2306                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2307                 mdt_lock_pdo_mode(info, o, lh);
2308                 if (lh->mlh_pdo_mode != LCK_NL) {
2309                         /*
2310                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2311                          * is never going to be sent to client and we do not
2312                          * want it slowed down due to possible cancels.
2313                          */
2314                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2315                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2316                                           policy, res_id, dlmflags,
2317                                           &info->mti_exp->exp_handle.h_cookie);
2318                         if (unlikely(rc))
2319                                 RETURN(rc);
2320                 }
2321
2322                 /*
2323                  * Finish res_id initializing by name hash marking part of
2324                  * directory which is taking modification.
2325                  */
2326                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2327         }
2328
2329         policy->l_inodebits.bits = ibits;
2330
2331         /*
2332          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2333          * going to be sent to client. If it is - mdt_intent_policy() path will
2334          * fix it up and turn FL_LOCAL flag off.
2335          */
2336         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2337                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2338                           &info->mti_exp->exp_handle.h_cookie);
2339         if (rc)
2340                 mdt_object_unlock(info, o, lh, 1);
2341         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2342                  lh->mlh_pdo_hash != 0 &&
2343                  (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX)) {
2344                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2345         }
2346
2347         RETURN(rc);
2348 }
2349
2350 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2351                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2352 {
2353         return mdt_object_lock0(info, o, lh, ibits, false, locality);
2354 }
2355
2356 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2357                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2358 {
2359         struct mdt_lock_handle tmp = *lh;
2360         int rc;
2361
2362         rc = mdt_object_lock0(info, o, &tmp, ibits, true, locality);
2363         if (rc == 0)
2364                 *lh = tmp;
2365
2366         return rc == 0;
2367 }
2368
2369 /**
2370  * Save a lock within request object.
2371  *
2372  * Keep the lock referenced until whether client ACK or transaction
2373  * commit happens or release the lock immediately depending on input
2374  * parameters. If COS is ON, a write lock is converted to COS lock
2375  * before saving.
2376  *
2377  * \param info thead info object
2378  * \param h lock handle
2379  * \param mode lock mode
2380  * \param decref force immediate lock releasing
2381  */
2382 static
2383 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2384                    ldlm_mode_t mode, int decref)
2385 {
2386         ENTRY;
2387
2388         if (lustre_handle_is_used(h)) {
2389                 if (decref || !info->mti_has_trans ||
2390                     !(mode & (LCK_PW | LCK_EX))){
2391                         mdt_fid_unlock(h, mode);
2392                 } else {
2393                         struct mdt_device *mdt = info->mti_mdt;
2394                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2395                         struct ptlrpc_request *req = mdt_info_req(info);
2396                         int no_ack = 0;
2397
2398                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2399                                  h->cookie);
2400                         /* there is no request if mdt_object_unlock() is called
2401                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2402                         if (likely(req != NULL)) {
2403                                 CDEBUG(D_HA, "request = %p reply state = %p"
2404                                        " transno = "LPD64"\n", req,
2405                                        req->rq_reply_state, req->rq_transno);
2406                                 if (mdt_cos_is_enabled(mdt)) {
2407                                         no_ack = 1;
2408                                         ldlm_lock_downgrade(lock, LCK_COS);
2409                                         mode = LCK_COS;
2410                                 }
2411                                 ptlrpc_save_lock(req, h, mode, no_ack);
2412                         } else {
2413                                 ldlm_lock_decref(h, mode);
2414                         }
2415                         if (mdt_is_lock_sync(lock)) {
2416                                 CDEBUG(D_HA, "found sync-lock,"
2417                                        " async commit started\n");
2418                                 mdt_device_commit_async(info->mti_env,
2419                                                         mdt);
2420                         }
2421                         LDLM_LOCK_PUT(lock);
2422                 }
2423                 h->cookie = 0ull;
2424         }
2425
2426         EXIT;
2427 }
2428
2429 /**
2430  * Unlock mdt object.
2431  *
2432  * Immeditely release the regular lock and the PDO lock or save the
2433  * lock in reqeuest and keep them referenced until client ACK or
2434  * transaction commit.
2435  *
2436  * \param info thread info object
2437  * \param o mdt object
2438  * \param lh mdt lock handle referencing regular and PDO locks
2439  * \param decref force immediate lock releasing
2440  */
2441 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2442                        struct mdt_lock_handle *lh, int decref)
2443 {
2444         ENTRY;
2445
2446         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2447         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2448
2449         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2450                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2451
2452         EXIT;
2453 }
2454
2455 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2456                                         const struct lu_fid *f,
2457                                         struct mdt_lock_handle *lh,
2458                                         __u64 ibits)
2459 {
2460         struct mdt_object *o;
2461
2462         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2463         if (!IS_ERR(o)) {
2464                 int rc;
2465
2466                 rc = mdt_object_lock(info, o, lh, ibits,
2467                                      MDT_LOCAL_LOCK);
2468                 if (rc != 0) {
2469                         mdt_object_put(info->mti_env, o);
2470                         o = ERR_PTR(rc);
2471                 }
2472         }
2473         return o;
2474 }
2475
2476 void mdt_object_unlock_put(struct mdt_thread_info * info,
2477                            struct mdt_object * o,
2478                            struct mdt_lock_handle *lh,
2479                            int decref)
2480 {
2481         mdt_object_unlock(info, o, lh, decref);
2482         mdt_object_put(info->mti_env, o);
2483 }
2484
2485 /*
2486  * Generic code handling requests that have struct mdt_body passed in:
2487  *
2488  *  - extract mdt_body from request and save it in @info, if present;
2489  *
2490  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2491  *  @info;
2492  *
2493  *  - if HABEO_CORPUS flag is set for this request type check whether object
2494  *  actually exists on storage (lu_object_exists()).
2495  *
2496  */
2497 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2498 {
2499         const struct mdt_body    *body;
2500         struct mdt_object        *obj;
2501         const struct lu_env      *env;
2502         struct req_capsule       *pill;
2503         int                       rc;
2504         ENTRY;
2505
2506         env = info->mti_env;
2507         pill = info->mti_pill;
2508
2509         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2510         if (body == NULL)
2511                 RETURN(-EFAULT);
2512
2513         if (!(body->valid & OBD_MD_FLID))
2514                 RETURN(0);
2515
2516         if (!fid_is_sane(&body->fid1)) {
2517                 CERROR("Invalid fid: "DFID"\n", PFID(&body->fid1));
2518                 RETURN(-EINVAL);
2519         }
2520
2521         /*
2522          * Do not get size or any capa fields before we check that request
2523          * contains capa actually. There are some requests which do not, for
2524          * instance MDS_IS_SUBDIR.
2525          */
2526         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2527             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2528                 mdt_set_capainfo(info, 0, &body->fid1,
2529                                  req_capsule_client_get(pill, &RMF_CAPA1));
2530
2531         obj = mdt_object_find(env, info->mti_mdt, &body->fid1);
2532         if (!IS_ERR(obj)) {
2533                 if ((flags & HABEO_CORPUS) &&
2534                     !mdt_object_exists(obj)) {
2535                         mdt_object_put(env, obj);
2536                         /* for capability renew ENOENT will be handled in
2537                          * mdt_renew_capa */
2538                         if (body->valid & OBD_MD_FLOSSCAPA)
2539                                 rc = 0;
2540                         else
2541                                 rc = -ENOENT;
2542                 } else {
2543                         info->mti_object = obj;
2544                         rc = 0;
2545                 }
2546         } else
2547                 rc = PTR_ERR(obj);
2548
2549         RETURN(rc);
2550 }
2551
2552 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2553 {
2554         struct req_capsule *pill = info->mti_pill;
2555         int rc;
2556         ENTRY;
2557
2558         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2559                 rc = mdt_body_unpack(info, flags);
2560         else
2561                 rc = 0;
2562
2563         if (rc == 0 && (flags & HABEO_REFERO)) {
2564                 /* Pack reply. */
2565                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2566                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2567                                              info->mti_body->eadatasize);
2568                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2569                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2570                                              RCL_SERVER, 0);
2571
2572                 rc = req_capsule_server_pack(pill);
2573         }
2574         RETURN(rc);
2575 }
2576
2577 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2578 {
2579         struct md_device *next = m->mdt_child;
2580
2581         return next->md_ops->mdo_init_capa_ctxt(env, next,
2582                                                 m->mdt_lut.lut_mds_capa,
2583                                                 m->mdt_capa_timeout,
2584                                                 m->mdt_capa_alg,
2585                                                 m->mdt_capa_keys);
2586 }
2587
2588 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2589 {
2590         lh->mlh_type = MDT_NUL_LOCK;
2591         lh->mlh_reg_lh.cookie = 0ull;
2592         lh->mlh_reg_mode = LCK_MINMODE;
2593         lh->mlh_pdo_lh.cookie = 0ull;
2594         lh->mlh_pdo_mode = LCK_MINMODE;
2595         lh->mlh_rreg_lh.cookie = 0ull;
2596         lh->mlh_rreg_mode = LCK_MINMODE;
2597 }
2598
2599 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2600 {
2601         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2602         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2603 }
2604
2605 /*
2606  * Initialize fields of struct mdt_thread_info. Other fields are left in
2607  * uninitialized state, because it's too expensive to zero out whole
2608  * mdt_thread_info (> 1K) on each request arrival.
2609  */
2610 void mdt_thread_info_init(struct ptlrpc_request *req,
2611                           struct mdt_thread_info *info)
2612 {
2613         int i;
2614
2615         info->mti_pill = &req->rq_pill;
2616
2617         /* lock handle */
2618         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2619                 mdt_lock_handle_init(&info->mti_lh[i]);
2620
2621         /* mdt device: it can be NULL while CONNECT */
2622         if (req->rq_export) {
2623                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2624                 info->mti_exp = req->rq_export;
2625         } else
2626                 info->mti_mdt = NULL;
2627         info->mti_env = req->rq_svc_thread->t_env;
2628         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2629         info->mti_mos = NULL;
2630
2631         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2632         info->mti_big_buf = LU_BUF_NULL;
2633         info->mti_body = NULL;
2634         info->mti_object = NULL;
2635         info->mti_dlm_req = NULL;
2636         info->mti_has_trans = 0;
2637         info->mti_cross_ref = 0;
2638         info->mti_opdata = 0;
2639         info->mti_big_lmm_used = 0;
2640
2641         /* To not check for split by default. */
2642         info->mti_spec.no_create = 0;
2643         info->mti_spec.sp_rm_entry = 0;
2644 }
2645
2646 void mdt_thread_info_fini(struct mdt_thread_info *info)
2647 {
2648         int i;
2649
2650         if (info->mti_object != NULL) {
2651                 mdt_object_put(info->mti_env, info->mti_object);
2652                 info->mti_object = NULL;
2653         }
2654
2655         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2656                 mdt_lock_handle_fini(&info->mti_lh[i]);
2657         info->mti_env = NULL;
2658         info->mti_pill = NULL;
2659         info->mti_exp = NULL;
2660
2661         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2662                 lu_buf_free(&info->mti_big_buf);
2663 }
2664
2665 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2666 {
2667         struct mdt_thread_info  *mti;
2668         struct lustre_capa      *lc;
2669
2670         mti = mdt_th_info(tsi->tsi_env);
2671         LASSERT(mti != NULL);
2672
2673         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2674         if (tsi->tsi_corpus != NULL) {
2675                 struct req_capsule *pill = tsi->tsi_pill;
2676
2677                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2678                 lu_object_get(tsi->tsi_corpus);
2679
2680                 /*
2681                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2682                  * due to mdt_set_capainfo().
2683                  */
2684                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2685                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2686                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2687                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
2688                 }
2689         }
2690         mti->mti_body = tsi->tsi_mdt_body;
2691         mti->mti_dlm_req = tsi->tsi_dlm_req;
2692
2693         return mti;
2694 }
2695
2696 int mdt_tgt_connect(struct tgt_session_info *tsi)
2697 {
2698         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2699         int                      rc;
2700
2701         ENTRY;
2702
2703         rc = tgt_connect(tsi);
2704         if (rc != 0)
2705                 RETURN(rc);
2706
2707         rc = mdt_init_idmap(tsi);
2708         if (rc != 0)
2709                 GOTO(err, rc);
2710         RETURN(0);
2711 err:
2712         obd_disconnect(class_export_get(req->rq_export));
2713         return rc;
2714 }
2715
2716 enum mdt_it_code {
2717         MDT_IT_OPEN,
2718         MDT_IT_OCREAT,
2719         MDT_IT_CREATE,
2720         MDT_IT_GETATTR,
2721         MDT_IT_READDIR,
2722         MDT_IT_LOOKUP,
2723         MDT_IT_UNLINK,
2724         MDT_IT_TRUNC,
2725         MDT_IT_GETXATTR,
2726         MDT_IT_LAYOUT,
2727         MDT_IT_QUOTA,
2728         MDT_IT_NR
2729 };
2730
2731 static int mdt_intent_getattr(enum mdt_it_code opcode,
2732                               struct mdt_thread_info *info,
2733                               struct ldlm_lock **,
2734                               __u64);
2735
2736 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2737                                 struct mdt_thread_info *info,
2738                                 struct ldlm_lock **lockp,
2739                                 __u64 flags);
2740
2741 static int mdt_intent_layout(enum mdt_it_code opcode,
2742                              struct mdt_thread_info *info,
2743                              struct ldlm_lock **,
2744                              __u64);
2745 static int mdt_intent_reint(enum mdt_it_code opcode,
2746                             struct mdt_thread_info *info,
2747                             struct ldlm_lock **,
2748                             __u64);
2749
2750 static struct mdt_it_flavor {
2751         const struct req_format *it_fmt;
2752         __u32                    it_flags;
2753         int                    (*it_act)(enum mdt_it_code ,
2754                                          struct mdt_thread_info *,
2755                                          struct ldlm_lock **,
2756                                          __u64);
2757         long                     it_reint;
2758 } mdt_it_flavor[] = {
2759         [MDT_IT_OPEN]     = {
2760                 .it_fmt   = &RQF_LDLM_INTENT,
2761                 /*.it_flags = HABEO_REFERO,*/
2762                 .it_flags = 0,
2763                 .it_act   = mdt_intent_reint,
2764                 .it_reint = REINT_OPEN
2765         },
2766         [MDT_IT_OCREAT]   = {
2767                 .it_fmt   = &RQF_LDLM_INTENT,
2768                 /*
2769                  * OCREAT is not a MUTABOR request as if the file
2770                  * already exists.
2771                  * We do the extra check of OBD_CONNECT_RDONLY in
2772                  * mdt_reint_open() when we really need to create
2773                  * the object.
2774                  */
2775                 .it_flags = 0,
2776                 .it_act   = mdt_intent_reint,
2777                 .it_reint = REINT_OPEN
2778         },
2779         [MDT_IT_CREATE]   = {
2780                 .it_fmt   = &RQF_LDLM_INTENT,
2781                 .it_flags = MUTABOR,
2782                 .it_act   = mdt_intent_reint,
2783                 .it_reint = REINT_CREATE
2784         },
2785         [MDT_IT_GETATTR]  = {
2786                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2787                 .it_flags = HABEO_REFERO,
2788                 .it_act   = mdt_intent_getattr
2789         },
2790         [MDT_IT_READDIR]  = {
2791                 .it_fmt   = NULL,
2792                 .it_flags = 0,
2793                 .it_act   = NULL
2794         },
2795         [MDT_IT_LOOKUP]   = {
2796                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2797                 .it_flags = HABEO_REFERO,
2798                 .it_act   = mdt_intent_getattr
2799         },
2800         [MDT_IT_UNLINK]   = {
2801                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2802                 .it_flags = MUTABOR,
2803                 .it_act   = NULL,
2804                 .it_reint = REINT_UNLINK
2805         },
2806         [MDT_IT_TRUNC]    = {
2807                 .it_fmt   = NULL,
2808                 .it_flags = MUTABOR,
2809                 .it_act   = NULL
2810         },
2811         [MDT_IT_GETXATTR] = {
2812                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2813                 .it_flags = HABEO_CORPUS,
2814                 .it_act   = mdt_intent_getxattr
2815         },
2816         [MDT_IT_LAYOUT] = {
2817                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2818                 .it_flags = 0,
2819                 .it_act   = mdt_intent_layout
2820         }
2821 };
2822
2823 int mdt_intent_lock_replace(struct mdt_thread_info *info,
2824                             struct ldlm_lock **lockp,
2825                             struct ldlm_lock *new_lock,
2826                             struct mdt_lock_handle *lh,
2827                             __u64 flags)
2828 {
2829         struct ptlrpc_request  *req = mdt_info_req(info);
2830         struct ldlm_lock       *lock = *lockp;
2831
2832         /*
2833          * Get new lock only for cases when possible resent did not find any
2834          * lock.
2835          */
2836         if (new_lock == NULL)
2837                 new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2838
2839         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2840                 lh->mlh_reg_lh.cookie = 0;
2841                 RETURN(0);
2842         }
2843
2844         LASSERTF(new_lock != NULL,
2845                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2846
2847         /*
2848          * If we've already given this lock to a client once, then we should
2849          * have no readers or writers.  Otherwise, we should have one reader
2850          * _or_ writer ref (which will be zeroed below) before returning the
2851          * lock to a client.
2852          */
2853         if (new_lock->l_export == req->rq_export) {
2854                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2855         } else {
2856                 LASSERT(new_lock->l_export == NULL);
2857                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2858         }
2859
2860         *lockp = new_lock;
2861
2862         if (new_lock->l_export == req->rq_export) {
2863                 /*
2864                  * Already gave this to the client, which means that we
2865                  * reconstructed a reply.
2866                  */
2867                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2868                         MSG_RESENT);
2869                 lh->mlh_reg_lh.cookie = 0;
2870                 RETURN(ELDLM_LOCK_REPLACED);
2871         }
2872
2873         /*
2874          * Fixup the lock to be given to the client.
2875          */
2876         lock_res_and_lock(new_lock);
2877         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
2878          * possible blocking AST. */
2879         while (new_lock->l_readers > 0) {
2880                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
2881                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2882                 new_lock->l_readers--;
2883         }
2884         while (new_lock->l_writers > 0) {
2885                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
2886                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2887                 new_lock->l_writers--;
2888         }
2889
2890         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
2891         new_lock->l_blocking_ast = lock->l_blocking_ast;
2892         new_lock->l_completion_ast = lock->l_completion_ast;
2893         new_lock->l_remote_handle = lock->l_remote_handle;
2894         new_lock->l_flags &= ~LDLM_FL_LOCAL;
2895
2896         unlock_res_and_lock(new_lock);
2897
2898         cfs_hash_add(new_lock->l_export->exp_lock_hash,
2899                      &new_lock->l_remote_handle,
2900                      &new_lock->l_exp_hash);
2901
2902         LDLM_LOCK_RELEASE(new_lock);
2903         lh->mlh_reg_lh.cookie = 0;
2904
2905         RETURN(ELDLM_LOCK_REPLACED);
2906 }
2907
2908 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
2909                                     struct ldlm_lock *new_lock,
2910                                     struct ldlm_lock **old_lock,
2911                                     struct mdt_lock_handle *lh)
2912 {
2913         struct ptlrpc_request  *req = mdt_info_req(info);
2914         struct obd_export      *exp = req->rq_export;
2915         struct lustre_handle    remote_hdl;
2916         struct ldlm_request    *dlmreq;
2917         struct ldlm_lock       *lock;
2918
2919         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
2920                 return;
2921
2922         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
2923         remote_hdl = dlmreq->lock_handle[0];
2924
2925         /* In the function below, .hs_keycmp resolves to
2926          * ldlm_export_lock_keycmp() */
2927         /* coverity[overrun-buffer-val] */
2928         lock = cfs_hash_lookup(exp->exp_lock_hash, &remote_hdl);
2929         if (lock) {
2930                 if (lock != new_lock) {
2931                         lh->mlh_reg_lh.cookie = lock->l_handle.h_cookie;
2932                         lh->mlh_reg_mode = lock->l_granted_mode;
2933
2934                         LDLM_DEBUG(lock, "Restoring lock cookie");
2935                         DEBUG_REQ(D_DLMTRACE, req,
2936                                   "restoring lock cookie "LPX64,
2937                                   lh->mlh_reg_lh.cookie);
2938                         if (old_lock)
2939                                 *old_lock = LDLM_LOCK_GET(lock);
2940                         cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
2941                         return;
2942                 }
2943
2944                 cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
2945         }
2946
2947         /*
2948          * If the xid matches, then we know this is a resent request, and allow
2949          * it. (It's probably an OPEN, for which we don't send a lock.
2950          */
2951         if (req_xid_is_last(req))
2952                 return;
2953
2954         /*
2955          * This remote handle isn't enqueued, so we never received or processed
2956          * this request.  Clear MSG_RESENT, because it can be handled like any
2957          * normal request now.
2958          */
2959         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
2960
2961         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
2962                   remote_hdl.cookie);
2963 }
2964
2965 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2966                                 struct mdt_thread_info *info,
2967                                 struct ldlm_lock **lockp,
2968                                 __u64 flags)
2969 {
2970         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
2971         struct ldlm_reply      *ldlm_rep = NULL;
2972         int rc, grc;
2973
2974         /*
2975          * Initialize lhc->mlh_reg_lh either from a previously granted lock
2976          * (for the resend case) or a new lock. Below we will use it to
2977          * replace the original lock.
2978          */
2979         mdt_intent_fixup_resent(info, *lockp, NULL, lhc);
2980         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
2981                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
2982                 rc = mdt_object_lock(info, info->mti_object, lhc,
2983                                         MDS_INODELOCK_XATTR,
2984                                         MDT_LOCAL_LOCK);
2985                 if (rc)
2986                         return rc;
2987         }
2988
2989         grc = mdt_getxattr(info);
2990
2991         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
2992
2993         if (mdt_info_req(info)->rq_repmsg != NULL)
2994                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
2995         if (ldlm_rep == NULL)
2996                 RETURN(err_serious(-EFAULT));
2997
2998         ldlm_rep->lock_policy_res2 = grc;
2999
3000         return rc;
3001 }
3002
3003 static int mdt_intent_getattr(enum mdt_it_code opcode,
3004                               struct mdt_thread_info *info,
3005                               struct ldlm_lock **lockp,
3006                               __u64 flags)
3007 {
3008         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3009         struct ldlm_lock       *new_lock = NULL;
3010         __u64                   child_bits;
3011         struct ldlm_reply      *ldlm_rep;
3012         struct ptlrpc_request  *req;
3013         struct mdt_body        *reqbody;
3014         struct mdt_body        *repbody;
3015         int                     rc, rc2;
3016         ENTRY;
3017
3018         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3019         LASSERT(reqbody);
3020
3021         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3022         LASSERT(repbody);
3023
3024         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
3025         repbody->eadatasize = 0;
3026         repbody->aclsize = 0;
3027
3028         switch (opcode) {
3029         case MDT_IT_LOOKUP:
3030                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3031                 break;
3032         case MDT_IT_GETATTR:
3033                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3034                              MDS_INODELOCK_PERM;
3035                 break;
3036         default:
3037                 CERROR("Unsupported intent (%d)\n", opcode);
3038                 GOTO(out_shrink, rc = -EINVAL);
3039         }
3040
3041         rc = mdt_init_ucred(info, reqbody);
3042         if (rc)
3043                 GOTO(out_shrink, rc);
3044
3045         req = info->mti_pill->rc_req;
3046         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3047         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3048
3049         /* Get lock from request for possible resent case. */
3050         mdt_intent_fixup_resent(info, *lockp, &new_lock, lhc);
3051
3052         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3053         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3054
3055         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3056                 ldlm_rep->lock_policy_res2 = 0;
3057         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3058             ldlm_rep->lock_policy_res2) {
3059                 lhc->mlh_reg_lh.cookie = 0ull;
3060                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3061         }
3062
3063         rc = mdt_intent_lock_replace(info, lockp, new_lock, lhc, flags);
3064         EXIT;
3065 out_ucred:
3066         mdt_exit_ucred(info);
3067 out_shrink:
3068         mdt_client_compatibility(info);
3069         rc2 = mdt_fix_reply(info);
3070         if (rc == 0)
3071                 rc = rc2;
3072         return rc;
3073 }
3074
3075 static int mdt_intent_layout(enum mdt_it_code opcode,
3076                              struct mdt_thread_info *info,
3077                              struct ldlm_lock **lockp,
3078                              __u64 flags)
3079 {
3080         struct layout_intent *layout;
3081         struct lu_fid *fid;
3082         struct mdt_object *obj = NULL;
3083         struct md_object *child = NULL;
3084         int rc;
3085         ENTRY;
3086
3087         if (opcode != MDT_IT_LAYOUT) {
3088                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3089                         opcode);
3090                 RETURN(-EINVAL);
3091         }
3092
3093         fid = &info->mti_tmp_fid2;
3094         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3095
3096         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3097         if (IS_ERR(obj))
3098                 RETURN(PTR_ERR(obj));
3099
3100         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3101                 child = mdt_object_child(obj);
3102
3103                 /* get the length of lsm */
3104                 rc = mo_xattr_get(info->mti_env, child, &LU_BUF_NULL,
3105                                   XATTR_NAME_LOV);
3106
3107                 if (rc > info->mti_mdt->mdt_max_mdsize)
3108                         info->mti_mdt->mdt_max_mdsize = rc;
3109         }
3110
3111         mdt_object_put(info->mti_env, obj);
3112
3113         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3114         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER,
3115                         ldlm_lvbo_size(*lockp));
3116         rc = req_capsule_server_pack(info->mti_pill);
3117         if (rc != 0)
3118                 RETURN(-EINVAL);
3119
3120         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3121         LASSERT(layout != NULL);
3122         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3123                 /* return to normal ldlm handling */
3124                 RETURN(0);
3125
3126         CERROR("%s: Unsupported layout intent (%d)\n",
3127                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3128         RETURN(-EINVAL);
3129 }
3130
3131 static int mdt_intent_reint(enum mdt_it_code opcode,
3132                             struct mdt_thread_info *info,
3133                             struct ldlm_lock **lockp,
3134                             __u64 flags)
3135 {
3136         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3137         struct ldlm_reply      *rep = NULL;
3138         long                    opc;
3139         int                     rc;
3140
3141         static const struct req_format *intent_fmts[REINT_MAX] = {
3142                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3143                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3144         };
3145
3146         ENTRY;
3147
3148         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3149         if (opc < 0)
3150                 RETURN(opc);
3151
3152         if (mdt_it_flavor[opcode].it_reint != opc) {
3153                 CERROR("Reint code %ld doesn't match intent: %d\n",
3154                        opc, opcode);
3155                 RETURN(err_serious(-EPROTO));
3156         }
3157
3158         /* Get lock from request for possible resent case. */
3159         mdt_intent_fixup_resent(info, *lockp, NULL, lhc);
3160
3161         rc = mdt_reint_internal(info, lhc, opc);
3162
3163         /* Check whether the reply has been packed successfully. */
3164         if (mdt_info_req(info)->rq_repmsg != NULL)
3165                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3166         if (rep == NULL)
3167                 RETURN(err_serious(-EFAULT));
3168
3169         /* MDC expects this in any case */
3170         if (rc != 0)
3171                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3172
3173         /* the open lock or the lock for cross-ref object should be
3174          * returned to the client */
3175         if (rc == -EREMOTE || mdt_get_disposition(rep, DISP_OPEN_LOCK)) {
3176                 LASSERT(lustre_handle_is_used(&lhc->mlh_reg_lh));
3177                 rep->lock_policy_res2 = 0;
3178                 rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3179                 RETURN(rc);
3180         }
3181
3182         rep->lock_policy_res2 = clear_serious(rc);
3183
3184         if (rep->lock_policy_res2 == -ENOENT &&
3185             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3186                 rep->lock_policy_res2 = 0;
3187
3188         if (rc == -ENOTCONN || rc == -ENODEV ||
3189             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3190                 /*
3191                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3192                  * will be returned by rq_status, and client at ptlrpc layer
3193                  * will detect this, then disconnect, reconnect the import
3194                  * immediately, instead of impacting the following the rpc.
3195                  */
3196                 lhc->mlh_reg_lh.cookie = 0ull;
3197                 RETURN(rc);
3198         } else {
3199                 /*
3200                  * For other cases, the error will be returned by intent.
3201                  * and client will retrieve the result from intent.
3202                  */
3203                  /*
3204                   * FIXME: when open lock is finished, that should be
3205                   * checked here.
3206                   */
3207                 if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3208                         LASSERTF(rc == 0, "Error occurred but lock handle "
3209                                  "is still in use, rc = %d\n", rc);
3210                         rep->lock_policy_res2 = 0;
3211                         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3212                         RETURN(rc);
3213                 } else {
3214                         lhc->mlh_reg_lh.cookie = 0ull;
3215                         RETURN(ELDLM_LOCK_ABORTED);
3216                 }
3217         }
3218 }
3219
3220 static int mdt_intent_code(long itcode)
3221 {
3222         int rc;
3223
3224         switch(itcode) {
3225         case IT_OPEN:
3226                 rc = MDT_IT_OPEN;
3227                 break;
3228         case IT_OPEN|IT_CREAT:
3229                 rc = MDT_IT_OCREAT;
3230                 break;
3231         case IT_CREAT:
3232                 rc = MDT_IT_CREATE;
3233                 break;
3234         case IT_READDIR:
3235                 rc = MDT_IT_READDIR;
3236                 break;
3237         case IT_GETATTR:
3238                 rc = MDT_IT_GETATTR;
3239                 break;
3240         case IT_LOOKUP:
3241                 rc = MDT_IT_LOOKUP;
3242                 break;
3243         case IT_UNLINK:
3244                 rc = MDT_IT_UNLINK;
3245                 break;
3246         case IT_TRUNC:
3247                 rc = MDT_IT_TRUNC;
3248                 break;
3249         case IT_GETXATTR:
3250                 rc = MDT_IT_GETXATTR;
3251                 break;
3252         case IT_LAYOUT:
3253                 rc = MDT_IT_LAYOUT;
3254                 break;
3255         case IT_QUOTA_DQACQ:
3256         case IT_QUOTA_CONN:
3257                 rc = MDT_IT_QUOTA;
3258                 break;
3259         default:
3260                 CERROR("Unknown intent opcode: %ld\n", itcode);
3261                 rc = -EINVAL;
3262                 break;
3263         }
3264         return rc;
3265 }
3266
3267 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3268                           struct ldlm_lock **lockp, __u64 flags)
3269 {
3270         struct req_capsule   *pill;
3271         struct mdt_it_flavor *flv;
3272         int opc;
3273         int rc;
3274         ENTRY;
3275
3276         opc = mdt_intent_code(itopc);
3277         if (opc < 0)
3278                 RETURN(-EINVAL);
3279
3280         pill = info->mti_pill;
3281
3282         if (opc == MDT_IT_QUOTA) {
3283                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3284
3285                 if (qmt == NULL)
3286                         RETURN(-EOPNOTSUPP);
3287
3288                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3289                 /* pass the request to quota master */
3290                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3291                                                  mdt_info_req(info), lockp,
3292                                                  flags);
3293                 RETURN(rc);
3294         }
3295
3296         flv  = &mdt_it_flavor[opc];
3297         if (flv->it_fmt != NULL)
3298                 req_capsule_extend(pill, flv->it_fmt);
3299
3300         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3301         if (rc == 0) {
3302                 struct ptlrpc_request *req = mdt_info_req(info);
3303                 if (flv->it_flags & MUTABOR &&
3304                     exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3305                         RETURN(-EROFS);
3306         }
3307         if (rc == 0 && flv->it_act != NULL) {
3308                 struct ldlm_reply *rep;
3309
3310                 /* execute policy */
3311                 rc = flv->it_act(opc, info, lockp, flags);
3312
3313                 /* Check whether the reply has been packed successfully. */
3314                 if (mdt_info_req(info)->rq_repmsg != NULL) {
3315                         rep = req_capsule_server_get(info->mti_pill,
3316                                                      &RMF_DLM_REP);
3317                         rep->lock_policy_res2 =
3318                                 ptlrpc_status_hton(rep->lock_policy_res2);
3319                 }
3320         } else {
3321                 rc = -EPROTO;
3322         }
3323         RETURN(rc);
3324 }
3325
3326 static int mdt_intent_policy(struct ldlm_namespace *ns,
3327                              struct ldlm_lock **lockp, void *req_cookie,
3328                              ldlm_mode_t mode, __u64 flags, void *data)
3329 {
3330         struct tgt_session_info *tsi;
3331         struct mdt_thread_info  *info;
3332         struct ptlrpc_request   *req  =  req_cookie;
3333         struct ldlm_intent      *it;
3334         struct req_capsule      *pill;
3335         int rc;
3336
3337         ENTRY;
3338
3339         LASSERT(req != NULL);
3340
3341         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3342
3343         info = tsi2mdt_info(tsi);
3344         LASSERT(info != NULL);
3345         pill = info->mti_pill;
3346         LASSERT(pill->rc_req == req);
3347
3348         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3349                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3350                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3351                 if (it != NULL) {
3352                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3353                         if (rc == 0)
3354                                 rc = ELDLM_OK;
3355
3356                         /* Lock without inodebits makes no sense and will oops
3357                          * later in ldlm. Let's check it now to see if we have
3358                          * ibits corrupted somewhere in mdt_intent_opc().
3359                          * The case for client miss to set ibits has been
3360                          * processed by others. */
3361                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3362                                         lr_type == LDLM_IBITS,
3363                                      info->mti_dlm_req->lock_desc.\
3364                                         l_policy_data.l_inodebits.bits != 0));
3365                 } else
3366                         rc = err_serious(-EFAULT);
3367         } else {
3368                 /* No intent was provided */
3369                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3370                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3371                 rc = req_capsule_server_pack(pill);
3372                 if (rc)
3373                         rc = err_serious(rc);
3374         }
3375         mdt_thread_info_fini(info);
3376         RETURN(rc);
3377 }
3378
3379 static int mdt_seq_fini(const struct lu_env *env,
3380                         struct mdt_device *m)
3381 {
3382         return seq_site_fini(env, mdt_seq_site(m));
3383 }
3384
3385 static int mdt_seq_init(const struct lu_env *env,
3386                         const char *uuid,
3387                         struct mdt_device *m)
3388 {
3389         struct seq_server_site *ss;
3390         char *prefix;
3391         int rc;
3392         ENTRY;
3393
3394         ss = mdt_seq_site(m);
3395
3396         /*
3397          * This is sequence-controller node. Init seq-controller server on local
3398          * MDT.
3399          */
3400         if (ss->ss_node_id == 0) {
3401                 LASSERT(ss->ss_control_seq == NULL);
3402
3403                 OBD_ALLOC_PTR(ss->ss_control_seq);
3404                 if (ss->ss_control_seq == NULL)
3405                         RETURN(-ENOMEM);
3406
3407                 rc = seq_server_init(ss->ss_control_seq,
3408                                      m->mdt_bottom, uuid,
3409                                      LUSTRE_SEQ_CONTROLLER,
3410                                      ss,
3411                                      env);
3412
3413                 if (rc)
3414                         GOTO(out_seq_fini, rc);
3415
3416                 OBD_ALLOC_PTR(ss->ss_client_seq);
3417                 if (ss->ss_client_seq == NULL)
3418                         GOTO(out_seq_fini, rc = -ENOMEM);
3419
3420                 OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3421                 if (prefix == NULL) {
3422                         OBD_FREE_PTR(ss->ss_client_seq);
3423                         GOTO(out_seq_fini, rc = -ENOMEM);
3424                 }
3425
3426                 snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s",
3427                          uuid);
3428
3429                 /*
3430                  * Init seq-controller client after seq-controller server is
3431                  * ready. Pass ss->ss_control_seq to it for direct talking.
3432                  */
3433                 rc = seq_client_init(ss->ss_client_seq, NULL,
3434                                      LUSTRE_SEQ_METADATA, prefix,
3435                                      ss->ss_control_seq);
3436                 OBD_FREE(prefix, MAX_OBD_NAME + 5);
3437
3438                 if (rc)
3439                         GOTO(out_seq_fini, rc);
3440         }
3441
3442         /* Init seq-server on local MDT */
3443         LASSERT(ss->ss_server_seq == NULL);
3444
3445         OBD_ALLOC_PTR(ss->ss_server_seq);
3446         if (ss->ss_server_seq == NULL)
3447                 GOTO(out_seq_fini, rc = -ENOMEM);
3448
3449         rc = seq_server_init(ss->ss_server_seq,
3450                              m->mdt_bottom, uuid,
3451                              LUSTRE_SEQ_SERVER,
3452                              ss,
3453                              env);
3454         if (rc)
3455                 GOTO(out_seq_fini, rc = -ENOMEM);
3456
3457         /* Assign seq-controller client to local seq-server. */
3458         if (ss->ss_node_id == 0) {
3459                 LASSERT(ss->ss_client_seq != NULL);
3460
3461                 rc = seq_server_set_cli(ss->ss_server_seq,
3462                                         ss->ss_client_seq,
3463                                         env);
3464         }
3465
3466         EXIT;
3467 out_seq_fini:
3468         if (rc)
3469                 mdt_seq_fini(env, m);
3470
3471         return rc;
3472 }
3473
3474 /*
3475  * FLD wrappers
3476  */
3477 static int mdt_fld_fini(const struct lu_env *env,
3478                         struct mdt_device *m)
3479 {
3480         struct seq_server_site *ss = mdt_seq_site(m);
3481         ENTRY;
3482
3483         if (ss && ss->ss_server_fld) {
3484                 fld_server_fini(env, ss->ss_server_fld);
3485                 OBD_FREE_PTR(ss->ss_server_fld);
3486                 ss->ss_server_fld = NULL;
3487         }
3488
3489         RETURN(0);
3490 }
3491
3492 static int mdt_fld_init(const struct lu_env *env,
3493                         const char *uuid,
3494                         struct mdt_device *m)
3495 {
3496         struct seq_server_site *ss;
3497         int rc;
3498         ENTRY;
3499
3500         ss = mdt_seq_site(m);
3501
3502         OBD_ALLOC_PTR(ss->ss_server_fld);
3503         if (ss->ss_server_fld == NULL)
3504                 RETURN(rc = -ENOMEM);
3505
3506         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3507                              ss->ss_node_id, LU_SEQ_RANGE_MDT);
3508         if (rc) {
3509                 OBD_FREE_PTR(ss->ss_server_fld);
3510                 ss->ss_server_fld = NULL;
3511                 RETURN(rc);
3512         }
3513
3514         RETURN(0);
3515 }
3516
3517 static void mdt_stack_pre_fini(const struct lu_env *env,
3518                            struct mdt_device *m, struct lu_device *top)
3519 {
3520         struct obd_device       *obd;
3521         struct lustre_cfg_bufs  *bufs;
3522         struct lustre_cfg       *lcfg;
3523         struct mdt_thread_info  *info;
3524         ENTRY;
3525
3526         LASSERT(top);
3527
3528         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3529         LASSERT(info != NULL);
3530
3531         bufs = &info->mti_u.bufs;
3532
3533         LASSERT(m->mdt_child_exp);
3534         LASSERT(m->mdt_child_exp->exp_obd);
3535         obd = m->mdt_child_exp->exp_obd;
3536
3537         /* process cleanup, pass mdt obd name to get obd umount flags */
3538         /* XXX: this is needed because all layers are referenced by
3539          * objects (some of them are pinned by osd, for example *
3540          * the proper solution should be a model where object used
3541          * by osd only doesn't have mdt/mdd slices -bzzz */
3542         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3543         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3544         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3545         if (!lcfg) {
3546                 CERROR("%s:Cannot alloc lcfg!\n", mdt_obd_name(m));
3547                 return;
3548         }
3549         top->ld_ops->ldo_process_config(env, top, lcfg);
3550         lustre_cfg_free(lcfg);
3551         EXIT;
3552 }
3553
3554 static void mdt_stack_fini(const struct lu_env *env,
3555                            struct mdt_device *m, struct lu_device *top)
3556 {
3557         struct obd_device       *obd = mdt2obd_dev(m);
3558         struct lustre_cfg_bufs  *bufs;
3559         struct lustre_cfg       *lcfg;
3560         struct mdt_thread_info  *info;
3561         char                     flags[3] = "";
3562         ENTRY;
3563
3564         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3565         LASSERT(info != NULL);
3566
3567         lu_dev_del_linkage(top->ld_site, top);
3568
3569         lu_site_purge(env, top->ld_site, -1);
3570
3571         bufs = &info->mti_u.bufs;
3572         /* process cleanup, pass mdt obd name to get obd umount flags */
3573         /* another purpose is to let all layers to release their objects */
3574         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3575         if (obd->obd_force)
3576                 strcat(flags, "F");
3577         if (obd->obd_fail)
3578                 strcat(flags, "A");
3579         lustre_cfg_bufs_set_string(bufs, 1, flags);
3580         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3581         if (!lcfg) {
3582                 CERROR("Cannot alloc lcfg!\n");
3583                 return;
3584         }
3585         LASSERT(top);
3586         top->ld_ops->ldo_process_config(env, top, lcfg);
3587         lustre_cfg_free(lcfg);
3588
3589         lu_site_purge(env, top->ld_site, -1);
3590
3591         m->mdt_child = NULL;
3592         m->mdt_bottom = NULL;
3593
3594         obd_disconnect(m->mdt_child_exp);
3595         m->mdt_child_exp = NULL;
3596
3597         obd_disconnect(m->mdt_bottom_exp);
3598         m->mdt_child_exp = NULL;
3599 }
3600
3601 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3602                                const char *next, struct obd_export **exp)
3603 {
3604         struct obd_connect_data *data = NULL;
3605         struct obd_device       *obd;
3606         int                      rc;
3607         ENTRY;
3608
3609         OBD_ALLOC_PTR(data);
3610         if (data == NULL)
3611                 GOTO(out, rc = -ENOMEM);
3612
3613         obd = class_name2obd(next);
3614         if (obd == NULL) {
3615                 CERROR("%s: can't locate next device: %s\n",
3616                        mdt_obd_name(m), next);
3617                 GOTO(out, rc = -ENOTCONN);
3618         }
3619
3620         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3621         data->ocd_version = LUSTRE_VERSION_CODE;
3622
3623         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3624         if (rc) {
3625                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3626                        mdt_obd_name(m), next, rc);
3627                 GOTO(out, rc);
3628         }
3629
3630 out:
3631         if (data)
3632                 OBD_FREE_PTR(data);
3633         RETURN(rc);
3634 }
3635
3636 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3637                           struct lustre_cfg *cfg)
3638 {
3639         char                   *dev = lustre_cfg_string(cfg, 0);
3640         int                     rc, name_size, uuid_size;
3641         char                   *name, *uuid, *p;
3642         struct lustre_cfg_bufs *bufs;
3643         struct lustre_cfg      *lcfg;
3644         struct obd_device      *obd;
3645         struct lustre_profile  *lprof;
3646         struct lu_site         *site;
3647         ENTRY;
3648
3649         /* in 1.8 we had the only device in the stack - MDS.
3650          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3651          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3652          * to generate names and setup MDT, MDD. MDT will be using
3653          * generated name to connect to MDD. for MDD the next device
3654          * will be LOD with name taken from so called "profile" which
3655          * is generated by mount_option line
3656          *
3657          * 1.8 MGS generates config. commands like this:
3658          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3659          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3660          * 2.0 MGS generates config. commands like this:
3661          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3662          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3663          *                    3:lustre-MDT0000-mdtlov  4:f
3664          *
3665          * we generate MDD name from MDT one, just replacing T with D
3666          *
3667          * after all the preparations, the logical equivalent will be
3668          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3669          *                    3:lustre-MDT0000-mdtlov  4:f
3670          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3671          *                    3:lustre-MDD0000  4:f
3672          *
3673          *  notice we build the stack from down to top: MDD first, then MDT */
3674
3675         name_size = MAX_OBD_NAME;
3676         uuid_size = MAX_OBD_NAME;
3677
3678         OBD_ALLOC(name, name_size);
3679         OBD_ALLOC(uuid, uuid_size);
3680         if (name == NULL || uuid == NULL)
3681                 GOTO(cleanup_mem, rc = -ENOMEM);
3682
3683         OBD_ALLOC_PTR(bufs);
3684         if (!bufs)
3685                 GOTO(cleanup_mem, rc = -ENOMEM);
3686
3687         strcpy(name, dev);
3688         p = strstr(name, "-MDT");
3689         if (p == NULL)
3690                 GOTO(free_bufs, rc = -ENOMEM);
3691         p[3] = 'D';
3692
3693         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3694
3695         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3696         if (lprof == NULL || lprof->lp_dt == NULL) {
3697                 CERROR("can't find the profile: %s\n",
3698                        lustre_cfg_string(cfg, 0));
3699                 GOTO(free_bufs, rc = -EINVAL);
3700         }
3701
3702         lustre_cfg_bufs_reset(bufs, name);
3703         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
3704         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3705         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3706
3707         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3708         if (!lcfg)
3709                 GOTO(free_bufs, rc = -ENOMEM);
3710
3711         rc = class_attach(lcfg);
3712         if (rc)
3713                 GOTO(lcfg_cleanup, rc);
3714
3715         obd = class_name2obd(name);
3716         if (!obd) {
3717                 CERROR("Can not find obd %s (%s in config)\n",
3718                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
3719                 GOTO(class_detach, rc = -EINVAL);
3720         }
3721
3722         lustre_cfg_free(lcfg);
3723
3724         lustre_cfg_bufs_reset(bufs, name);
3725         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3726         lustre_cfg_bufs_set_string(bufs, 2, dev);
3727         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3728
3729         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3730
3731         rc = class_setup(obd, lcfg);
3732         if (rc)
3733                 GOTO(class_detach, rc);
3734
3735         /* connect to MDD we just setup */
3736         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
3737         if (rc)
3738                 GOTO(class_detach, rc);
3739
3740         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
3741         LASSERT(site);
3742         LASSERT(mdt_lu_site(mdt) == NULL);
3743         mdt->mdt_lu_dev.ld_site = site;
3744         site->ls_top_dev = &mdt->mdt_lu_dev;
3745         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
3746
3747
3748         /* now connect to bottom OSD */
3749         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
3750         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
3751         if (rc)
3752                 GOTO(class_detach, rc);
3753         mdt->mdt_bottom =
3754                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
3755
3756
3757         rc = lu_env_refill((struct lu_env *)env);
3758         if (rc != 0)
3759                 CERROR("Failure to refill session: '%d'\n", rc);
3760
3761         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
3762
3763         EXIT;
3764 class_detach:
3765         if (rc)
3766                 class_detach(obd, lcfg);
3767 lcfg_cleanup:
3768         lustre_cfg_free(lcfg);
3769 free_bufs:
3770         OBD_FREE_PTR(bufs);
3771 cleanup_mem:
3772         if (name)
3773                 OBD_FREE(name, name_size);
3774         if (uuid)
3775                 OBD_FREE(uuid, uuid_size);
3776         RETURN(rc);
3777 }
3778
3779 /* setup quota master target on MDT0 */
3780 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
3781                           struct lustre_cfg *cfg)
3782 {
3783         struct obd_device       *obd;
3784         char                    *dev = lustre_cfg_string(cfg, 0);
3785         char                    *qmtname, *uuid, *p;
3786         struct lustre_cfg_bufs  *bufs;
3787         struct lustre_cfg       *lcfg;
3788         struct lustre_profile   *lprof;
3789         struct obd_connect_data *data;
3790         int                      rc;
3791         ENTRY;
3792
3793         LASSERT(mdt->mdt_qmt_exp == NULL);
3794         LASSERT(mdt->mdt_qmt_dev == NULL);
3795
3796         /* quota master is on MDT0 only for now */
3797         if (mdt->mdt_seq_site.ss_node_id != 0)
3798                 RETURN(0);
3799
3800         /* MGS generates config commands which look as follows:
3801          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3802          *                    3:lustre-MDT0000-mdtlov  4:f
3803          *
3804          * We generate the QMT name from the MDT one, just replacing MD with QM
3805          * after all the preparations, the logical equivalent will be:
3806          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
3807          *                    3:lustre-MDT0000-osd  4:f */
3808         OBD_ALLOC(qmtname, MAX_OBD_NAME);
3809         OBD_ALLOC(uuid, UUID_MAX);
3810         OBD_ALLOC_PTR(bufs);
3811         OBD_ALLOC_PTR(data);
3812         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
3813                 GOTO(cleanup_mem, rc = -ENOMEM);
3814
3815         strcpy(qmtname, dev);
3816         p = strstr(qmtname, "-MDT");
3817         if (p == NULL)
3818                 GOTO(cleanup_mem, rc = -ENOMEM);
3819         /* replace MD with QM */
3820         p[1] = 'Q';
3821         p[2] = 'M';
3822
3823         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
3824
3825         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3826         if (lprof == NULL || lprof->lp_dt == NULL) {
3827                 CERROR("can't find profile for %s\n",
3828                        lustre_cfg_string(cfg, 0));
3829                 GOTO(cleanup_mem, rc = -EINVAL);
3830         }
3831
3832         lustre_cfg_bufs_reset(bufs, qmtname);
3833         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
3834         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3835         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3836
3837         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3838         if (!lcfg)
3839                 GOTO(cleanup_mem, rc = -ENOMEM);
3840
3841         rc = class_attach(lcfg);
3842         if (rc)
3843                 GOTO(lcfg_cleanup, rc);
3844
3845         obd = class_name2obd(qmtname);
3846         if (!obd) {
3847                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
3848                        lustre_cfg_string(cfg, 0));
3849                 GOTO(class_detach, rc = -EINVAL);
3850         }
3851
3852         lustre_cfg_free(lcfg);
3853
3854         lustre_cfg_bufs_reset(bufs, qmtname);
3855         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3856         lustre_cfg_bufs_set_string(bufs, 2, dev);
3857
3858         /* for quota, the next device should be the OSD device */
3859         lustre_cfg_bufs_set_string(bufs, 3,
3860                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
3861
3862         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3863
3864         rc = class_setup(obd, lcfg);
3865         if (rc)
3866                 GOTO(class_detach, rc);
3867
3868         mdt->mdt_qmt_dev = obd->obd_lu_dev;
3869
3870         /* configure local quota objects */
3871         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
3872                                                    &mdt->mdt_lu_dev,
3873                                                    mdt->mdt_qmt_dev);
3874         if (rc)
3875                 GOTO(class_cleanup, rc);
3876
3877         /* connect to quota master target */
3878         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3879         data->ocd_version = LUSTRE_VERSION_CODE;
3880         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
3881                          data, NULL);
3882         if (rc) {
3883                 CERROR("cannot connect to quota master device %s (%d)\n",
3884                        qmtname, rc);
3885                 GOTO(class_cleanup, rc);
3886         }
3887
3888         EXIT;
3889 class_cleanup:
3890         if (rc) {
3891                 class_manual_cleanup(obd);
3892                 mdt->mdt_qmt_dev = NULL;
3893         }
3894 class_detach:
3895         if (rc)
3896                 class_detach(obd, lcfg);
3897 lcfg_cleanup:
3898         lustre_cfg_free(lcfg);
3899 cleanup_mem:
3900         if (bufs)
3901                 OBD_FREE_PTR(bufs);
3902         if (qmtname)
3903                 OBD_FREE(qmtname, MAX_OBD_NAME);
3904         if (uuid)
3905                 OBD_FREE(uuid, UUID_MAX);
3906         if (data)
3907                 OBD_FREE_PTR(data);
3908         return rc;
3909 }
3910
3911 /* Shutdown quota master target associated with mdt */
3912 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
3913 {
3914         ENTRY;
3915
3916         if (mdt->mdt_qmt_exp == NULL)
3917                 RETURN_EXIT;
3918         LASSERT(mdt->mdt_qmt_dev != NULL);
3919
3920         /* the qmt automatically shuts down when the mdt disconnects */
3921         obd_disconnect(mdt->mdt_qmt_exp);
3922         mdt->mdt_qmt_exp = NULL;
3923         mdt->mdt_qmt_dev = NULL;
3924         EXIT;
3925 }
3926
3927 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
3928  * for now. This will be removed along with converting rest of MDT code
3929  * to use tgt_session_info */
3930 int mdt_tgt_getxattr(struct tgt_session_info *tsi)
3931 {
3932         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
3933         int                      rc;
3934
3935         rc = mdt_getxattr(info);
3936
3937         mdt_thread_info_fini(info);
3938         return rc;
3939 }
3940
3941 static struct tgt_handler mdt_tgt_handlers[] = {
3942 TGT_RPC_HANDLER(MDS_FIRST_OPC,
3943                 0,                      MDS_CONNECT,    mdt_tgt_connect,
3944                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
3945 TGT_RPC_HANDLER(MDS_FIRST_OPC,
3946                 0,                      MDS_DISCONNECT, tgt_disconnect,
3947                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
3948 TGT_RPC_HANDLER(MDS_FIRST_OPC,
3949                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
3950                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
3951 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
3952 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
3953 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
3954 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
3955                                                         mdt_getattr_name),
3956 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
3957 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
3958 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
3959 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
3960 TGT_MDT_HDL(HABEO_CORPUS,               MDS_DONE_WRITING,
3961                                                         mdt_done_writing),
3962 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
3963 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
3964 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_IS_SUBDIR,  mdt_is_subdir),
3965 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
3966 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
3967                                                         mdt_hsm_progress),
3968 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
3969                                                         mdt_hsm_ct_register),
3970 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
3971                                                         mdt_hsm_ct_unregister),
3972 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
3973                                                         mdt_hsm_state_get),
3974 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
3975                                                         mdt_hsm_state_set),
3976 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
3977 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
3978                                                         mdt_hsm_request),
3979 TGT_MDT_HDL(HABEO_CORPUS|HABEO_REFERO | MUTABOR, MDS_SWAP_LAYOUTS,
3980                                                         mdt_swap_layouts)
3981 };
3982
3983 static struct tgt_handler mdt_sec_ctx_ops[] = {
3984 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
3985 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
3986 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
3987 };
3988
3989 static struct tgt_handler mdt_quota_ops[] = {
3990 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
3991 };
3992
3993 static struct tgt_opc_slice mdt_common_slice[] = {
3994         {
3995                 .tos_opc_start  = MDS_FIRST_OPC,
3996                 .tos_opc_end    = MDS_LAST_OPC,
3997                 .tos_hs         = mdt_tgt_handlers
3998         },
3999         {
4000                 .tos_opc_start  = OBD_FIRST_OPC,
4001                 .tos_opc_end    = OBD_LAST_OPC,
4002                 .tos_hs         = tgt_obd_handlers
4003         },
4004         {
4005                 .tos_opc_start  = LDLM_FIRST_OPC,
4006                 .tos_opc_end    = LDLM_LAST_OPC,
4007                 .tos_hs         = tgt_dlm_handlers
4008         },
4009         {
4010                 .tos_opc_start  = SEC_FIRST_OPC,
4011                 .tos_opc_end    = SEC_LAST_OPC,
4012                 .tos_hs         = mdt_sec_ctx_ops
4013         },
4014         {
4015                 .tos_opc_start  = UPDATE_OBJ,
4016                 .tos_opc_end    = UPDATE_LAST_OPC,
4017                 .tos_hs         = tgt_out_handlers
4018         },
4019         {
4020                 .tos_opc_start  = FLD_FIRST_OPC,
4021                 .tos_opc_end    = FLD_LAST_OPC,
4022                 .tos_hs         = fld_handlers
4023         },
4024         {
4025                 .tos_opc_start  = SEQ_FIRST_OPC,
4026                 .tos_opc_end    = SEQ_LAST_OPC,
4027                 .tos_hs         = seq_handlers
4028         },
4029         {
4030                 .tos_opc_start  = QUOTA_DQACQ,
4031                 .tos_opc_end    = QUOTA_LAST_OPC,
4032                 .tos_hs         = mdt_quota_ops
4033         },
4034         {
4035                 .tos_opc_start  = LLOG_FIRST_OPC,
4036                 .tos_opc_end    = LLOG_LAST_OPC,
4037                 .tos_hs         = tgt_llog_handlers
4038         },
4039
4040         {
4041                 .tos_hs         = NULL
4042         }
4043 };
4044
4045 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4046 {
4047         struct md_device  *next = m->mdt_child;
4048         struct lu_device  *d    = &m->mdt_lu_dev;
4049         struct obd_device *obd = mdt2obd_dev(m);
4050         ENTRY;
4051
4052         target_recovery_fini(obd);
4053
4054         ping_evictor_stop();
4055
4056         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4057
4058         if (m->mdt_opts.mo_coordinator)
4059                 mdt_hsm_cdt_stop(m);
4060
4061         mdt_hsm_cdt_fini(m);
4062
4063         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4064         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4065         obd_exports_barrier(obd);
4066         obd_zombie_barrier();
4067
4068         mdt_procfs_fini(m);
4069
4070         tgt_fini(env, &m->mdt_lut);
4071         mdt_fs_cleanup(env, m);
4072         upcall_cache_cleanup(m->mdt_identity_cache);
4073         m->mdt_identity_cache = NULL;
4074
4075         if (m->mdt_namespace != NULL) {
4076                 ldlm_namespace_free(m->mdt_namespace, NULL,
4077                                     d->ld_obd->obd_force);
4078                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4079         }
4080
4081         mdt_quota_fini(env, m);
4082
4083         cfs_free_nidlist(&m->mdt_nosquash_nids);
4084         if (m->mdt_nosquash_str) {
4085                 OBD_FREE(m->mdt_nosquash_str, m->mdt_nosquash_strlen);
4086                 m->mdt_nosquash_str = NULL;
4087                 m->mdt_nosquash_strlen = 0;
4088         }
4089
4090         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_PAUSE_LFSCK, 0, NULL);
4091
4092         mdt_seq_fini(env, m);
4093         mdt_fld_fini(env, m);
4094
4095         next->md_ops->mdo_init_capa_ctxt(env, next, 0, 0, 0, NULL);
4096         cfs_timer_disarm(&m->mdt_ck_timer);
4097         mdt_ck_thread_stop(m);
4098
4099         /*
4100          * Finish the stack
4101          */
4102         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4103
4104         LASSERT(cfs_atomic_read(&d->ld_ref) == 0);
4105
4106         server_put_mount(mdt_obd_name(m), NULL);
4107
4108         EXIT;
4109 }
4110
4111 int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4112
4113 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4114                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4115 {
4116         struct mdt_thread_info    *info;
4117         struct obd_device         *obd;
4118         const char                *dev = lustre_cfg_string(cfg, 0);
4119         const char                *num = lustre_cfg_string(cfg, 2);
4120         struct lustre_mount_info  *lmi = NULL;
4121         struct lustre_sb_info     *lsi;
4122         struct lu_site            *s;
4123         struct seq_server_site    *ss_site;
4124         const char                *identity_upcall = "NONE";
4125         struct md_device          *next;
4126         int                        rc;
4127         long                       node_id;
4128         mntopt_t                   mntopts;
4129         ENTRY;
4130
4131         lu_device_init(&m->mdt_lu_dev, ldt);
4132         /*
4133          * Environment (env) might be missing mdt_thread_key values at that
4134          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4135          * mode.
4136          *
4137          * Usually device allocation path doesn't use module key values, but
4138          * mdt has to do a lot of work here, so allocate key value.
4139          */
4140         rc = lu_env_refill((struct lu_env *)env);
4141         if (rc != 0)
4142                 RETURN(rc);
4143
4144         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4145         LASSERT(info != NULL);
4146
4147         obd = class_name2obd(dev);
4148         LASSERT(obd != NULL);
4149
4150         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4151
4152         m->mdt_som_conf = 0;
4153
4154         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4155
4156         /* default is coordinator off, it is started through conf_param
4157          * or /proc */
4158         m->mdt_opts.mo_coordinator = 0;
4159
4160         lmi = server_get_mount(dev);
4161         if (lmi == NULL) {
4162                 CERROR("Cannot get mount info for %s!\n", dev);
4163                 RETURN(-EFAULT);
4164         } else {
4165                 lsi = s2lsi(lmi->lmi_sb);
4166                 /* CMD is supported only in IAM mode */
4167                 LASSERT(num);
4168                 node_id = simple_strtol(num, NULL, 10);
4169                 obd->u.obt.obt_magic = OBT_MAGIC;
4170         }
4171
4172         spin_lock_init(&m->mdt_ioepoch_lock);
4173         m->mdt_capa_timeout = CAPA_TIMEOUT;
4174         m->mdt_capa_alg = CAPA_HMAC_ALG_SHA1;
4175         m->mdt_ck_timeout = CAPA_KEY_TIMEOUT;
4176         m->mdt_squash_uid = 0;
4177         m->mdt_squash_gid = 0;
4178         CFS_INIT_LIST_HEAD(&m->mdt_nosquash_nids);
4179         m->mdt_nosquash_str = NULL;
4180         m->mdt_nosquash_strlen = 0;
4181         init_rwsem(&m->mdt_squash_sem);
4182         spin_lock_init(&m->mdt_osfs_lock);
4183         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4184         m->mdt_enable_remote_dir = 0;
4185         m->mdt_enable_remote_dir_gid = 0;
4186
4187         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4188         m->mdt_lu_dev.ld_obd = obd;
4189         /* Set this lu_device to obd for error handling purposes. */
4190         obd->obd_lu_dev = &m->mdt_lu_dev;
4191
4192         /* init the stack */
4193         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4194         if (rc) {
4195                 CERROR("%s: Can't init device stack, rc %d\n",
4196                        mdt_obd_name(m), rc);
4197                 GOTO(err_lmi, rc);
4198         }
4199
4200         s = mdt_lu_site(m);
4201         ss_site = mdt_seq_site(m);
4202         s->ld_seq_site = ss_site;
4203         ss_site->ss_lu = s;
4204
4205         /* set server index */
4206         ss_site->ss_node_id = node_id;
4207
4208         /* failover is the default
4209          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4210          * assumed whose ss_node_id == 0 XXX
4211          * */
4212         obd->obd_replayable = 1;
4213         /* No connection accepted until configurations will finish */
4214         obd->obd_no_conn = 1;
4215
4216         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4217                 char *str = lustre_cfg_string(cfg, 4);
4218                 if (strchr(str, 'n')) {
4219                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4220                         obd->obd_replayable = 0;
4221                 }
4222         }
4223
4224         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4225         if (rc)
4226                 GOTO(err_fini_stack, rc);
4227
4228         rc = mdt_seq_init(env, mdt_obd_name(m), m);
4229         if (rc)
4230                 GOTO(err_fini_fld, rc);
4231
4232         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4233                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4234         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4235                                               LDLM_NAMESPACE_SERVER,
4236                                               LDLM_NAMESPACE_GREEDY,
4237                                               LDLM_NS_TYPE_MDT);
4238         if (m->mdt_namespace == NULL)
4239                 GOTO(err_fini_seq, rc = -ENOMEM);
4240
4241         m->mdt_namespace->ns_lvbp = m;
4242         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4243
4244         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4245         /* set obd_namespace for compatibility with old code */
4246         obd->obd_namespace = m->mdt_namespace;
4247
4248         cfs_timer_init(&m->mdt_ck_timer, mdt_ck_timer_callback, m);
4249
4250         rc = mdt_hsm_cdt_init(m);
4251         if (rc != 0) {
4252                 CERROR("%s: error initializing coordinator, rc %d\n",
4253                        mdt_obd_name(m), rc);
4254                 GOTO(err_free_ns, rc);
4255         }
4256
4257         rc = mdt_ck_thread_start(m);
4258         if (rc)
4259                 GOTO(err_free_hsm, rc);
4260
4261         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4262                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4263                       OBD_FAIL_MDS_ALL_REPLY_NET);
4264         if (rc)
4265                 GOTO(err_capa, rc);
4266
4267         rc = mdt_fs_setup(env, m, obd, lsi);
4268         if (rc)
4269                 GOTO(err_tgt, rc);
4270
4271         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4272
4273         next = m->mdt_child;
4274         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4275                                          &mntopts);
4276         if (rc)
4277                 GOTO(err_fs_cleanup, rc);
4278
4279         if (mntopts & MNTOPT_USERXATTR)
4280                 m->mdt_opts.mo_user_xattr = 1;
4281         else
4282                 m->mdt_opts.mo_user_xattr = 0;
4283
4284         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4285         if (rc)
4286                 GOTO(err_fs_cleanup, rc);
4287
4288         if (mntopts & MNTOPT_ACL)
4289                 m->mdt_opts.mo_acl = 1;
4290         else
4291                 m->mdt_opts.mo_acl = 0;
4292
4293         /* XXX: to support suppgid for ACL, we enable identity_upcall
4294          * by default, otherwise, maybe got unexpected -EACCESS. */
4295         if (m->mdt_opts.mo_acl)
4296                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4297
4298         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4299                                                 identity_upcall,
4300                                                 &mdt_identity_upcall_cache_ops);
4301         if (IS_ERR(m->mdt_identity_cache)) {
4302                 rc = PTR_ERR(m->mdt_identity_cache);
4303                 m->mdt_identity_cache = NULL;
4304                 GOTO(err_fs_cleanup, rc);
4305         }
4306
4307         rc = mdt_procfs_init(m, dev);
4308         if (rc) {
4309                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4310                 GOTO(err_recovery, rc);
4311         }
4312
4313         rc = mdt_quota_init(env, m, cfg);
4314         if (rc)
4315                 GOTO(err_procfs, rc);
4316
4317         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4318         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4319                            "mdt_ldlm_client", m->mdt_ldlm_client);
4320
4321         ping_evictor_start();
4322
4323         /* recovery will be started upon mdt_prepare()
4324          * when the whole stack is complete and ready
4325          * to serve the requests */
4326
4327         mdt_init_capa_ctxt(env, m);
4328
4329         /* Reduce the initial timeout on an MDS because it doesn't need such
4330          * a long timeout as an OST does. Adaptive timeouts will adjust this
4331          * value appropriately. */
4332         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4333                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4334
4335         RETURN(0);
4336 err_procfs:
4337         mdt_procfs_fini(m);
4338 err_recovery:
4339         target_recovery_fini(obd);
4340         upcall_cache_cleanup(m->mdt_identity_cache);
4341         m->mdt_identity_cache = NULL;
4342 err_fs_cleanup:
4343         mdt_fs_cleanup(env, m);
4344 err_tgt:
4345         tgt_fini(env, &m->mdt_lut);
4346 err_capa:
4347         cfs_timer_disarm(&m->mdt_ck_timer);
4348         mdt_ck_thread_stop(m);
4349 err_free_hsm:
4350         mdt_hsm_cdt_fini(m);
4351 err_free_ns:
4352         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4353         obd->obd_namespace = m->mdt_namespace = NULL;
4354 err_fini_seq:
4355         mdt_seq_fini(env, m);
4356 err_fini_fld:
4357         mdt_fld_fini(env, m);
4358 err_fini_stack:
4359         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4360 err_lmi:
4361         if (lmi)
4362                 server_put_mount(dev, lmi->lmi_mnt);
4363         return(rc);
4364 }
4365
4366 /* For interoperability, the left element is old parameter, the right one
4367  * is the new version of the parameter, if some parameter is deprecated,
4368  * the new version should be set as NULL. */
4369 static struct cfg_interop_param mdt_interop_param[] = {
4370         { "mdt.group_upcall",   NULL },
4371         { "mdt.quota_type",     NULL },
4372         { "mdd.quota_type",     NULL },
4373         { "mdt.rootsquash",     "mdt.root_squash" },
4374         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4375         { NULL }
4376 };
4377
4378 /* used by MGS to process specific configurations */
4379 static int mdt_process_config(const struct lu_env *env,
4380                               struct lu_device *d, struct lustre_cfg *cfg)
4381 {
4382         struct mdt_device *m = mdt_dev(d);
4383         struct md_device *md_next = m->mdt_child;
4384         struct lu_device *next = md2lu_dev(md_next);
4385         int rc;
4386         ENTRY;
4387
4388         switch (cfg->lcfg_command) {
4389         case LCFG_PARAM: {
4390                 struct lprocfs_static_vars  lvars;
4391                 struct obd_device          *obd = d->ld_obd;
4392
4393                 /* For interoperability */
4394                 struct cfg_interop_param   *ptr = NULL;
4395                 struct lustre_cfg          *old_cfg = NULL;
4396                 char                       *param = NULL;
4397
4398                 param = lustre_cfg_string(cfg, 1);
4399                 if (param == NULL) {
4400                         CERROR("param is empty\n");
4401                         rc = -EINVAL;
4402                         break;
4403                 }
4404
4405                 ptr = class_find_old_param(param, mdt_interop_param);
4406                 if (ptr != NULL) {
4407                         if (ptr->new_param == NULL) {
4408                                 rc = 0;
4409                                 CWARN("For interoperability, skip this %s."
4410                                       " It is obsolete.\n", ptr->old_param);
4411                                 break;
4412                         }
4413
4414                         CWARN("Found old param %s, changed it to %s.\n",
4415                               ptr->old_param, ptr->new_param);
4416
4417                         old_cfg = cfg;
4418                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4419                         if (IS_ERR(cfg)) {
4420                                 rc = PTR_ERR(cfg);
4421                                 break;
4422                         }
4423                 }
4424
4425                 lprocfs_mdt_init_vars(&lvars);
4426                 rc = class_process_proc_param(PARAM_MDT, lvars.obd_vars,
4427                                               cfg, obd);
4428                 if (rc > 0 || rc == -ENOSYS) {
4429                         /* is it an HSM var ? */
4430                         rc = class_process_proc_param(PARAM_HSM,
4431                                                       hsm_cdt_get_proc_vars(),
4432                                                       cfg, obd);
4433                         if (rc > 0 || rc == -ENOSYS)
4434                                 /* we don't understand; pass it on */
4435                                 rc = next->ld_ops->ldo_process_config(env, next,
4436                                                                       cfg);
4437                 }
4438
4439                 if (old_cfg != NULL)
4440                         lustre_cfg_free(cfg);
4441
4442                 break;
4443         }
4444         default:
4445                 /* others are passed further */
4446                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4447                 break;
4448         }
4449         RETURN(rc);
4450 }
4451
4452 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4453                                           const struct lu_object_header *hdr,
4454                                           struct lu_device *d)
4455 {
4456         struct mdt_object *mo;
4457
4458         ENTRY;
4459
4460         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, __GFP_IO);
4461         if (mo != NULL) {
4462                 struct lu_object *o;
4463                 struct lu_object_header *h;
4464
4465                 o = &mo->mot_obj;
4466                 h = &mo->mot_header;
4467                 lu_object_header_init(h);
4468                 lu_object_init(o, h, d);
4469                 lu_object_add_top(h, o);
4470                 o->lo_ops = &mdt_obj_ops;
4471                 mutex_init(&mo->mot_ioepoch_mutex);
4472                 mutex_init(&mo->mot_lov_mutex);
4473                 init_rwsem(&mo->mot_open_sem);
4474                 RETURN(o);
4475         }
4476         RETURN(NULL);
4477 }
4478
4479 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4480                            const struct lu_object_conf *unused)
4481 {
4482         struct mdt_device *d = mdt_dev(o->lo_dev);
4483         struct lu_device  *under;
4484         struct lu_object  *below;
4485         int                rc = 0;
4486         ENTRY;
4487
4488         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4489                PFID(lu_object_fid(o)));
4490
4491         under = &d->mdt_child->md_lu_dev;
4492         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4493         if (below != NULL) {
4494                 lu_object_add(o, below);
4495         } else
4496                 rc = -ENOMEM;
4497
4498         RETURN(rc);
4499 }
4500
4501 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4502 {
4503         struct mdt_object *mo = mdt_obj(o);
4504         struct lu_object_header *h;
4505         ENTRY;
4506
4507         h = o->lo_header;
4508         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4509                PFID(lu_object_fid(o)));
4510
4511         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4512         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4513
4514         lu_object_fini(o);
4515         lu_object_header_fini(h);
4516         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4517
4518         EXIT;
4519 }
4520
4521 static int mdt_object_print(const struct lu_env *env, void *cookie,
4522                             lu_printer_t p, const struct lu_object *o)
4523 {
4524         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4525         return (*p)(env, cookie, LUSTRE_MDT_NAME"-object@%p(ioepoch="LPU64" "
4526                     "flags="LPX64", epochcount=%d, writecount=%d)",
4527                     mdto, mdto->mot_ioepoch, mdto->mot_flags,
4528                     mdto->mot_ioepoch_count, mdto->mot_writecount);
4529 }
4530
4531 static int mdt_prepare(const struct lu_env *env,
4532                 struct lu_device *pdev,
4533                 struct lu_device *cdev)
4534 {
4535         struct mdt_device *mdt = mdt_dev(cdev);
4536         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4537         struct obd_device *obd = cdev->ld_obd;
4538         struct lfsck_start_param lsp;
4539         int rc;
4540
4541         ENTRY;
4542
4543         LASSERT(obd);
4544
4545         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4546         if (rc)
4547                 RETURN(rc);
4548
4549         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4550         if (rc)
4551                 RETURN(rc);
4552
4553         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4554         if (rc)
4555                 RETURN(rc);
4556
4557         lsp.lsp_start = NULL;
4558         lsp.lsp_namespace = mdt->mdt_namespace;
4559         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
4560                                                    OBD_IOC_START_LFSCK,
4561                                                    0, &lsp);
4562         if (rc != 0) {
4563                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
4564                       mdt_obd_name(mdt), rc);
4565                 rc = 0;
4566         }
4567
4568         if (mdt->mdt_seq_site.ss_node_id == 0) {
4569                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4570                                                          &mdt->mdt_md_root_fid);
4571                 if (rc)
4572                         RETURN(rc);
4573         }
4574
4575         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4576         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4577         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4578         LASSERT(obd->obd_no_conn);
4579         spin_lock(&obd->obd_dev_lock);
4580         obd->obd_no_conn = 0;
4581         spin_unlock(&obd->obd_dev_lock);
4582
4583         if (obd->obd_recovering == 0)
4584                 mdt_postrecov(env, mdt);
4585
4586         RETURN(rc);
4587 }
4588
4589 const struct lu_device_operations mdt_lu_ops = {
4590         .ldo_object_alloc   = mdt_object_alloc,
4591         .ldo_process_config = mdt_process_config,
4592         .ldo_prepare        = mdt_prepare,
4593 };
4594
4595 static const struct lu_object_operations mdt_obj_ops = {
4596         .loo_object_init    = mdt_object_init,
4597         .loo_object_free    = mdt_object_free,
4598         .loo_object_print   = mdt_object_print
4599 };
4600
4601 static int mdt_obd_set_info_async(const struct lu_env *env,
4602                                   struct obd_export *exp,
4603                                   __u32 keylen, void *key,
4604                                   __u32 vallen, void *val,
4605                                   struct ptlrpc_request_set *set)
4606 {
4607         int rc;
4608
4609         ENTRY;
4610
4611         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4612                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4613                 RETURN(rc);
4614         }
4615
4616         RETURN(0);
4617 }
4618
4619 /**
4620  * Match client and server connection feature flags.
4621  *
4622  * Compute the compatibility flags for a connection request based on
4623  * features mutually supported by client and server.
4624  *
4625  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4626  * must not be updated here, otherwise a partially initialized value may
4627  * be exposed. After the connection request is successfully processed,
4628  * the top-level MDT connect request handler atomically updates the export
4629  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4630  * reply. \see mdt_connect().
4631  *
4632  * \param exp   the obd_export associated with this client/target pair
4633  * \param mdt   the target device for the connection
4634  * \param data  stores data for this connect request
4635  *
4636  * \retval 0       success
4637  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4638  * \retval -EBADE  client and server feature requirements are incompatible
4639  */
4640 static int mdt_connect_internal(struct obd_export *exp,
4641                                 struct mdt_device *mdt,
4642                                 struct obd_connect_data *data)
4643 {
4644         LASSERT(data != NULL);
4645
4646         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4647         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4648
4649         /* If no known bits (which should not happen, probably,
4650            as everybody should support LOOKUP and UPDATE bits at least)
4651            revert to compat mode with plain locks. */
4652         if (!data->ocd_ibits_known &&
4653             data->ocd_connect_flags & OBD_CONNECT_IBITS)
4654                 data->ocd_connect_flags &= ~OBD_CONNECT_IBITS;
4655
4656         if (!mdt->mdt_opts.mo_acl)
4657                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4658
4659         if (!mdt->mdt_opts.mo_user_xattr)
4660                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4661
4662         if (!mdt->mdt_som_conf)
4663                 data->ocd_connect_flags &= ~OBD_CONNECT_SOM;
4664
4665         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4666                 data->ocd_brw_size = min(data->ocd_brw_size,
4667                                          (__u32)MD_MAX_BRW_SIZE);
4668                 if (data->ocd_brw_size == 0) {
4669                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4670                                " ocd_version: %x ocd_grant: %d "
4671                                "ocd_index: %u ocd_brw_size is "
4672                                "unexpectedly zero, network data "
4673                                "corruption? Refusing connection of this"
4674                                " client\n",
4675                                mdt_obd_name(mdt),
4676                                exp->exp_client_uuid.uuid,
4677                                exp, data->ocd_connect_flags, data->ocd_version,
4678                                data->ocd_grant, data->ocd_index);
4679                         return -EPROTO;
4680                 }
4681         }
4682
4683         /* NB: Disregard the rule against updating
4684          * exp_connect_data.ocd_connect_flags in this case, since
4685          * tgt_client_new() needs to know if this is a lightweight
4686          * connection, and it is safe to expose this flag before
4687          * connection processing completes. */
4688         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
4689                 spin_lock(&exp->exp_lock);
4690                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
4691                 spin_unlock(&exp->exp_lock);
4692         }
4693
4694         data->ocd_version = LUSTRE_VERSION_CODE;
4695
4696         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
4697                 CWARN("%s: MDS requires FID support, but client not\n",
4698                       mdt_obd_name(mdt));
4699                 return -EBADE;
4700         }
4701
4702         if (mdt->mdt_som_conf &&
4703             !(data->ocd_connect_flags & (OBD_CONNECT_LIGHTWEIGHT |
4704                                          OBD_CONNECT_MDS_MDS |
4705                                          OBD_CONNECT_SOM))) {
4706                 CWARN("%s: MDS has SOM enabled, but client does not support "
4707                       "it\n", mdt_obd_name(mdt));
4708                 return -EBADE;
4709         }
4710
4711         if (OCD_HAS_FLAG(data, PINGLESS)) {
4712                 if (ptlrpc_pinger_suppress_pings()) {
4713                         spin_lock(&exp->exp_obd->obd_dev_lock);
4714                         list_del_init(&exp->exp_obd_chain_timed);
4715                         spin_unlock(&exp->exp_obd->obd_dev_lock);
4716                 } else {
4717                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
4718                 }
4719         }
4720
4721         data->ocd_max_easize = mdt->mdt_max_ea_size;
4722
4723         return 0;
4724 }
4725
4726 /* mds_connect copy */
4727 static int mdt_obd_connect(const struct lu_env *env,
4728                            struct obd_export **exp, struct obd_device *obd,
4729                            struct obd_uuid *cluuid,
4730                            struct obd_connect_data *data,
4731                            void *localdata)
4732 {
4733         struct obd_export      *lexp;
4734         struct lustre_handle    conn = { 0 };
4735         struct mdt_device      *mdt;
4736         int                     rc;
4737         ENTRY;
4738
4739         LASSERT(env != NULL);
4740         if (!exp || !obd || !cluuid)
4741                 RETURN(-EINVAL);
4742
4743         mdt = mdt_dev(obd->obd_lu_dev);
4744
4745         /*
4746          * first, check whether the stack is ready to handle requests
4747          * XXX: probably not very appropriate method is used now
4748          *      at some point we should find a better one
4749          */
4750         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
4751             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
4752                 rc = obd_health_check(env, mdt->mdt_child_exp->exp_obd);
4753                 if (rc)
4754                         RETURN(-EAGAIN);
4755                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
4756         }
4757
4758         rc = class_connect(&conn, obd, cluuid);
4759         if (rc)
4760                 RETURN(rc);
4761
4762         lexp = class_conn2export(&conn);
4763         LASSERT(lexp != NULL);
4764
4765         rc = mdt_connect_internal(lexp, mdt, data);
4766         if (rc == 0) {
4767                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
4768
4769                 LASSERT(lcd);
4770                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
4771                 rc = tgt_client_new(env, lexp);
4772                 if (rc == 0)
4773                         mdt_export_stats_init(obd, lexp, localdata);
4774         }
4775
4776         if (rc != 0) {
4777                 class_disconnect(lexp);
4778                 *exp = NULL;
4779         } else {
4780                 *exp = lexp;
4781         }
4782
4783         RETURN(rc);
4784 }
4785
4786 static int mdt_obd_reconnect(const struct lu_env *env,
4787                              struct obd_export *exp, struct obd_device *obd,
4788                              struct obd_uuid *cluuid,
4789                              struct obd_connect_data *data,
4790                              void *localdata)
4791 {
4792         int                     rc;
4793         ENTRY;
4794
4795         if (exp == NULL || obd == NULL || cluuid == NULL)
4796                 RETURN(-EINVAL);
4797
4798         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
4799         if (rc == 0)
4800                 mdt_export_stats_init(obd, exp, localdata);
4801
4802         RETURN(rc);
4803 }
4804
4805 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
4806                                    struct mdt_thread_info *info,
4807                                    struct mdt_file_data *mfd)
4808 {
4809         struct lu_context ses;
4810         int rc;
4811         ENTRY;
4812
4813         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
4814         if (rc)
4815                 RETURN(rc);
4816
4817         env->le_ses = &ses;
4818         lu_context_enter(&ses);
4819
4820         mdt_ucred(info)->uc_valid = UCRED_OLD;
4821         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
4822
4823         lu_context_exit(&ses);
4824         lu_context_fini(&ses);
4825         env->le_ses = NULL;
4826
4827         RETURN(rc);
4828 }
4829
4830 static int mdt_export_cleanup(struct obd_export *exp)
4831 {
4832         struct mdt_export_data *med = &exp->exp_mdt_data;
4833         struct obd_device      *obd = exp->exp_obd;
4834         struct mdt_device      *mdt;
4835         struct mdt_thread_info *info;
4836         struct lu_env           env;
4837         CFS_LIST_HEAD(closing_list);
4838         struct mdt_file_data *mfd, *n;
4839         int rc = 0;
4840         ENTRY;
4841
4842         spin_lock(&med->med_open_lock);
4843         while (!cfs_list_empty(&med->med_open_head)) {
4844                 cfs_list_t *tmp = med->med_open_head.next;
4845                 mfd = cfs_list_entry(tmp, struct mdt_file_data, mfd_list);
4846
4847                 /* Remove mfd handle so it can't be found again.
4848                  * We are consuming the mfd_list reference here. */
4849                 class_handle_unhash(&mfd->mfd_handle);
4850                 cfs_list_move_tail(&mfd->mfd_list, &closing_list);
4851         }
4852         spin_unlock(&med->med_open_lock);
4853         mdt = mdt_dev(obd->obd_lu_dev);
4854         LASSERT(mdt != NULL);
4855
4856         rc = lu_env_init(&env, LCT_MD_THREAD);
4857         if (rc)
4858                 RETURN(rc);
4859
4860         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
4861         LASSERT(info != NULL);
4862         memset(info, 0, sizeof *info);
4863         info->mti_env = &env;
4864         info->mti_mdt = mdt;
4865         info->mti_exp = exp;
4866
4867         if (!cfs_list_empty(&closing_list)) {
4868                 struct md_attr *ma = &info->mti_attr;
4869
4870                 /* Close any open files (which may also cause orphan unlinking). */
4871                 cfs_list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
4872                         cfs_list_del_init(&mfd->mfd_list);
4873                         ma->ma_need = ma->ma_valid = 0;
4874
4875                         /* This file is being closed due to an eviction, it
4876                          * could have been modified and now dirty regarding to
4877                          * HSM archive, check this!
4878                          * The logic here is to mark a file dirty if there's a
4879                          * chance it was dirtied before the client was evicted,
4880                          * so that we don't have to wait for a release attempt
4881                          * before finding out the file was actually dirty and
4882                          * fail the release. Aggressively marking it dirty here
4883                          * will cause the policy engine to attempt to
4884                          * re-archive it; when rearchiving, we can compare the
4885                          * current version to the HSM data_version and make the
4886                          * archive request into a noop if it's not actually
4887                          * dirty.
4888                          */
4889                         if (mfd->mfd_mode & (FMODE_WRITE|MDS_FMODE_TRUNC))
4890                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
4891
4892                         /* Don't unlink orphan on failover umount, LU-184 */
4893                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
4894                                 ma->ma_valid = MA_FLAGS;
4895                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
4896                         }
4897                         mdt_mfd_close(info, mfd);
4898                 }
4899         }
4900         info->mti_mdt = NULL;
4901         /* cleanup client slot early */
4902         /* Do not erase record for recoverable client. */
4903         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
4904                 tgt_client_del(&env, exp);
4905         lu_env_fini(&env);
4906
4907         RETURN(rc);
4908 }
4909
4910 static int mdt_obd_disconnect(struct obd_export *exp)
4911 {
4912         int rc;
4913         ENTRY;
4914
4915         LASSERT(exp);
4916         class_export_get(exp);
4917
4918         rc = server_disconnect_export(exp);
4919         if (rc != 0)
4920                 CDEBUG(D_IOCTL, "server disconnect error: %d\n", rc);
4921
4922         rc = mdt_export_cleanup(exp);
4923         class_export_put(exp);
4924         RETURN(rc);
4925 }
4926
4927 /* FIXME: Can we avoid using these two interfaces? */
4928 static int mdt_init_export(struct obd_export *exp)
4929 {
4930         struct mdt_export_data *med = &exp->exp_mdt_data;
4931         int                     rc;
4932         ENTRY;
4933
4934         CFS_INIT_LIST_HEAD(&med->med_open_head);
4935         spin_lock_init(&med->med_open_lock);
4936         mutex_init(&med->med_idmap_mutex);
4937         med->med_idmap = NULL;
4938         spin_lock(&exp->exp_lock);
4939         exp->exp_connecting = 1;
4940         spin_unlock(&exp->exp_lock);
4941
4942         /* self-export doesn't need client data and ldlm initialization */
4943         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
4944                                      &exp->exp_client_uuid)))
4945                 RETURN(0);
4946
4947         rc = tgt_client_alloc(exp);
4948         if (rc)
4949                 GOTO(err, rc);
4950
4951         rc = ldlm_init_export(exp);
4952         if (rc)
4953                 GOTO(err_free, rc);
4954
4955         RETURN(rc);
4956
4957 err_free:
4958         tgt_client_free(exp);
4959 err:
4960         CERROR("%s: Failed to initialize export: rc = %d\n",
4961                exp->exp_obd->obd_name, rc);
4962         return rc;
4963 }
4964
4965 static int mdt_destroy_export(struct obd_export *exp)
4966 {
4967         ENTRY;
4968
4969         if (exp_connect_rmtclient(exp))
4970                 mdt_cleanup_idmap(&exp->exp_mdt_data);
4971
4972         target_destroy_export(exp);
4973         /* destroy can be called from failed obd_setup, so
4974          * checking uuid is safer than obd_self_export */
4975         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
4976                                      &exp->exp_client_uuid)))
4977                 RETURN(0);
4978
4979         ldlm_destroy_export(exp);
4980         tgt_client_free(exp);
4981
4982         LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
4983         LASSERT(cfs_list_empty(&exp->exp_mdt_data.med_open_head));
4984
4985         RETURN(0);
4986 }
4987
4988 /** The maximum depth that fid2path() will search.
4989  * This is limited only because we want to store the fids for
4990  * historical path lookup purposes.
4991  */
4992 #define MAX_PATH_DEPTH 100
4993
4994 /** mdt_path() lookup structure. */
4995 struct path_lookup_info {
4996         __u64                   pli_recno;      /**< history point */
4997         __u64                   pli_currec;     /**< current record */
4998         struct lu_fid           pli_fid;
4999         struct lu_fid           pli_fids[MAX_PATH_DEPTH]; /**< path, in fids */
5000         struct mdt_object       *pli_mdt_obj;
5001         char                    *pli_path;      /**< full path */
5002         int                     pli_pathlen;
5003         int                     pli_linkno;     /**< which hardlink to follow */
5004         int                     pli_fidcount;   /**< number of \a pli_fids */
5005 };
5006
5007 static int mdt_links_read(struct mdt_thread_info *info,
5008                           struct mdt_object *mdt_obj, struct linkea_data *ldata)
5009 {
5010         int rc;
5011
5012         LASSERT(ldata->ld_buf->lb_buf != NULL);
5013
5014         if (!mdt_object_exists(mdt_obj))
5015                 return -ENODATA;
5016
5017         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5018                           ldata->ld_buf, XATTR_NAME_LINK);
5019         if (rc == -ERANGE) {
5020                 /* Buf was too small, figure out what we need. */
5021                 lu_buf_free(ldata->ld_buf);
5022                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5023                                   ldata->ld_buf, XATTR_NAME_LINK);
5024                 if (rc < 0)
5025                         return rc;
5026                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5027                 if (ldata->ld_buf->lb_buf == NULL)
5028                         return -ENOMEM;
5029                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5030                                   ldata->ld_buf, XATTR_NAME_LINK);
5031         }
5032         if (rc < 0)
5033                 return rc;
5034
5035         return linkea_init(ldata);
5036 }
5037
5038 static int mdt_path_current(struct mdt_thread_info *info,
5039                             struct path_lookup_info *pli)
5040 {
5041         struct mdt_device       *mdt = info->mti_mdt;
5042         struct mdt_object       *mdt_obj;
5043         struct link_ea_header   *leh;
5044         struct link_ea_entry    *lee;
5045         struct lu_name          *tmpname = &info->mti_name;
5046         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5047         struct lu_buf           *buf = &info->mti_big_buf;
5048         char                    *ptr;
5049         int                     reclen;
5050         struct linkea_data      ldata = { 0 };
5051         int                     rc = 0;
5052         ENTRY;
5053
5054         /* temp buffer for path element, the buffer will be finally freed
5055          * in mdt_thread_info_fini */
5056         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5057         if (buf->lb_buf == NULL)
5058                 RETURN(-ENOMEM);
5059
5060         ldata.ld_buf = buf;
5061         ptr = pli->pli_path + pli->pli_pathlen - 1;
5062         *ptr = 0;
5063         --ptr;
5064         pli->pli_fidcount = 0;
5065         pli->pli_fids[0] = *(struct lu_fid *)mdt_object_fid(pli->pli_mdt_obj);
5066
5067         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5068          * so checking root_fid can only happen on MDT0. */
5069         while (!lu_fid_eq(&mdt->mdt_md_root_fid,
5070                           &pli->pli_fids[pli->pli_fidcount])) {
5071                 mdt_obj = mdt_object_find(info->mti_env, mdt,
5072                                           &pli->pli_fids[pli->pli_fidcount]);
5073                 if (IS_ERR(mdt_obj))
5074                         GOTO(out, rc = PTR_ERR(mdt_obj));
5075                 if (mdt_object_remote(mdt_obj)) {
5076                         mdt_object_put(info->mti_env, mdt_obj);
5077                         GOTO(remote_out, rc = -EREMOTE);
5078                 }
5079                 if (!mdt_object_exists(mdt_obj)) {
5080                         mdt_object_put(info->mti_env, mdt_obj);
5081                         GOTO(out, rc = -ENOENT);
5082                 }
5083
5084                 rc = mdt_links_read(info, mdt_obj, &ldata);
5085                 mdt_object_put(info->mti_env, mdt_obj);
5086                 if (rc != 0)
5087                         GOTO(out, rc);
5088
5089                 leh = buf->lb_buf;
5090                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5091                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5092                 /* If set, use link #linkno for path lookup, otherwise use
5093                    link #0.  Only do this for the final path element. */
5094                 if (pli->pli_fidcount == 0 &&
5095                     pli->pli_linkno < leh->leh_reccount) {
5096                         int count;
5097                         for (count = 0; count < pli->pli_linkno; count++) {
5098                                 lee = (struct link_ea_entry *)
5099                                      ((char *)lee + reclen);
5100                                 linkea_entry_unpack(lee, &reclen, tmpname,
5101                                                     tmpfid);
5102                         }
5103                         if (pli->pli_linkno < leh->leh_reccount - 1)
5104                                 /* indicate to user there are more links */
5105                                 pli->pli_linkno++;
5106                 }
5107
5108                 /* Pack the name in the end of the buffer */
5109                 ptr -= tmpname->ln_namelen;
5110                 if (ptr - 1 <= pli->pli_path)
5111                         GOTO(out, rc = -EOVERFLOW);
5112                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5113                 *(--ptr) = '/';
5114
5115                 /* Store the parent fid for historic lookup */
5116                 if (++pli->pli_fidcount >= MAX_PATH_DEPTH)
5117                         GOTO(out, rc = -EOVERFLOW);
5118                 pli->pli_fids[pli->pli_fidcount] = *tmpfid;
5119         }
5120
5121 remote_out:
5122         ptr++; /* skip leading / */
5123         memmove(pli->pli_path, ptr, pli->pli_path + pli->pli_pathlen - ptr);
5124
5125         EXIT;
5126 out:
5127         return rc;
5128 }
5129
5130 /* Returns the full path to this fid, as of changelog record recno. */
5131 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5132                     char *path, int pathlen, __u64 *recno, int *linkno,
5133                     struct lu_fid *fid)
5134 {
5135         struct mdt_device       *mdt = info->mti_mdt;
5136         struct path_lookup_info *pli;
5137         int                     tries = 3;
5138         int                     rc = -EAGAIN;
5139         ENTRY;
5140
5141         if (pathlen < 3)
5142                 RETURN(-EOVERFLOW);
5143
5144         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5145                 path[0] = '\0';
5146                 RETURN(0);
5147         }
5148
5149         OBD_ALLOC_PTR(pli);
5150         if (pli == NULL)
5151                 RETURN(-ENOMEM);
5152
5153         pli->pli_mdt_obj = obj;
5154         pli->pli_recno = *recno;
5155         pli->pli_path = path;
5156         pli->pli_pathlen = pathlen;
5157         pli->pli_linkno = *linkno;
5158
5159         /* Retry multiple times in case file is being moved */
5160         while (tries-- && rc == -EAGAIN)
5161                 rc = mdt_path_current(info, pli);
5162
5163         /* return the last resolved fids to the client, so the client will
5164          * build the left path on another MDT for remote object */
5165         *fid = pli->pli_fids[pli->pli_fidcount];
5166
5167         *recno = pli->pli_currec;
5168         /* Return next link index to caller */
5169         *linkno = pli->pli_linkno;
5170
5171         OBD_FREE_PTR(pli);
5172
5173         RETURN(rc);
5174 }
5175
5176 static int mdt_fid2path(struct mdt_thread_info *info,
5177                         struct getinfo_fid2path *fp)
5178 {
5179         struct mdt_device *mdt = info->mti_mdt;
5180         struct mdt_object *obj;
5181         int    rc;
5182         ENTRY;
5183
5184         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5185                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5186
5187         if (!fid_is_sane(&fp->gf_fid))
5188                 RETURN(-EINVAL);
5189
5190         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5191                 CWARN("%s: "DFID" is invalid, sequence should be "
5192                       ">= "LPX64"\n", mdt_obd_name(mdt),
5193                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5194                 RETURN(-EINVAL);
5195         }
5196
5197         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5198         if (obj == NULL || IS_ERR(obj)) {
5199                 CDEBUG(D_IOCTL, "no object "DFID": %ld\n", PFID(&fp->gf_fid),
5200                        PTR_ERR(obj));
5201                 RETURN(-EINVAL);
5202         }
5203
5204         if (mdt_object_remote(obj))
5205                 rc = -EREMOTE;
5206         else if (!mdt_object_exists(obj))
5207                 rc = -ENOENT;
5208         else
5209                 rc = 0;
5210
5211         if (rc < 0) {
5212                 mdt_object_put(info->mti_env, obj);
5213                 CDEBUG(D_IOCTL, "nonlocal object "DFID": %d\n",
5214                        PFID(&fp->gf_fid), rc);
5215                 RETURN(rc);
5216         }
5217
5218         rc = mdt_path(info, obj, fp->gf_path, fp->gf_pathlen, &fp->gf_recno,
5219                       &fp->gf_linkno, &fp->gf_fid);
5220
5221         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5222                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5223
5224         mdt_object_put(info->mti_env, obj);
5225
5226         RETURN(rc);
5227 }
5228
5229 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5230                             void *val, int vallen)
5231 {
5232         struct getinfo_fid2path *fpout, *fpin;
5233         int rc = 0;
5234
5235         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5236         fpout = val;
5237
5238         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5239                 lustre_swab_fid2path(fpin);
5240
5241         memcpy(fpout, fpin, sizeof(*fpin));
5242         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5243                 RETURN(-EINVAL);
5244
5245         rc = mdt_fid2path(info, fpout);
5246         RETURN(rc);
5247 }
5248
5249 int mdt_get_info(struct tgt_session_info *tsi)
5250 {
5251         char    *key;
5252         int      keylen;
5253         __u32   *vallen;
5254         void    *valout;
5255         int      rc;
5256
5257         ENTRY;
5258
5259         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5260         if (key == NULL) {
5261                 CDEBUG(D_IOCTL, "No GETINFO key");
5262                 RETURN(err_serious(-EFAULT));
5263         }
5264         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5265                                       RCL_CLIENT);
5266
5267         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5268         if (vallen == NULL) {
5269                 CDEBUG(D_IOCTL, "Unable to get RMF_GETINFO_VALLEN buffer");
5270                 RETURN(err_serious(-EFAULT));
5271         }
5272
5273         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5274                              *vallen);
5275         rc = req_capsule_server_pack(tsi->tsi_pill);
5276         if (rc)
5277                 RETURN(err_serious(rc));
5278
5279         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5280         if (valout == NULL) {
5281                 CDEBUG(D_IOCTL, "Unable to get get-info RPC out buffer");
5282                 RETURN(err_serious(-EFAULT));
5283         }
5284
5285         if (KEY_IS(KEY_FID2PATH)) {
5286                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5287
5288                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5289                 mdt_thread_info_fini(info);
5290         } else {
5291                 rc = -EINVAL;
5292         }
5293         RETURN(rc);
5294 }
5295
5296 /* Pass the ioc down */
5297 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5298                          unsigned int cmd, int len, void *data)
5299 {
5300         struct lu_context ioctl_session;
5301         struct md_device *next = mdt->mdt_child;
5302         int rc;
5303         ENTRY;
5304
5305         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5306         if (rc)
5307                 RETURN(rc);
5308         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5309         lu_context_enter(&ioctl_session);
5310         env->le_ses = &ioctl_session;
5311
5312         LASSERT(next->md_ops->mdo_iocontrol);
5313         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5314
5315         lu_context_exit(&ioctl_session);
5316         lu_context_fini(&ioctl_session);
5317         RETURN(rc);
5318 }
5319
5320 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5321 {
5322         struct obd_ioctl_data *data = karg;
5323         struct lu_fid *fid;
5324         __u64 version;
5325         struct mdt_object *obj;
5326         struct mdt_lock_handle  *lh;
5327         int rc;
5328         ENTRY;
5329
5330         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5331             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5332                 RETURN(-EINVAL);
5333
5334         fid = (struct lu_fid *)data->ioc_inlbuf1;
5335
5336         if (!fid_is_sane(fid))
5337                 RETURN(-EINVAL);
5338
5339         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5340
5341         lh = &mti->mti_lh[MDT_LH_PARENT];
5342         mdt_lock_reg_init(lh, LCK_CR);
5343
5344         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5345         if (IS_ERR(obj))
5346                 RETURN(PTR_ERR(obj));
5347
5348         if (mdt_object_remote(obj)) {
5349                 rc = -EREMOTE;
5350                 /**
5351                  * before calling version get the correct MDS should be
5352                  * fid, this is error to find remote object here
5353                  */
5354                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5355         } else if (!mdt_object_exists(obj)) {
5356                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5357                 rc = -ENOENT;
5358         } else {
5359                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5360                *(__u64 *)data->ioc_inlbuf2 = version;
5361                 rc = 0;
5362         }
5363         mdt_object_unlock_put(mti, obj, lh, 1);
5364         RETURN(rc);
5365 }
5366
5367 /* ioctls on obd dev */
5368 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5369                          void *karg, void *uarg)
5370 {
5371         struct lu_env      env;
5372         struct obd_device *obd = exp->exp_obd;
5373         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5374         struct dt_device  *dt = mdt->mdt_bottom;
5375         int rc;
5376
5377         ENTRY;
5378         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5379         rc = lu_env_init(&env, LCT_MD_THREAD);
5380         if (rc)
5381                 RETURN(rc);
5382
5383         switch (cmd) {
5384         case OBD_IOC_SYNC:
5385                 rc = mdt_device_sync(&env, mdt);
5386                 break;
5387         case OBD_IOC_SET_READONLY:
5388                 rc = dt->dd_ops->dt_ro(&env, dt);
5389                 break;
5390         case OBD_IOC_ABORT_RECOVERY:
5391                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5392                 target_stop_recovery_thread(obd);
5393                 rc = 0;
5394                 break;
5395         case OBD_IOC_CHANGELOG_REG:
5396         case OBD_IOC_CHANGELOG_DEREG:
5397         case OBD_IOC_CHANGELOG_CLEAR:
5398                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5399                 break;
5400         case OBD_IOC_START_LFSCK: {
5401                 struct md_device *next = mdt->mdt_child;
5402                 struct obd_ioctl_data *data = karg;
5403                 struct lfsck_start_param lsp;
5404
5405                 if (unlikely(data == NULL)) {
5406                         rc = -EINVAL;
5407                         break;
5408                 }
5409
5410                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5411                 lsp.lsp_namespace = mdt->mdt_namespace;
5412                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5413                 break;
5414         }
5415         case OBD_IOC_STOP_LFSCK: {
5416                 struct md_device *next = mdt->mdt_child;
5417
5418                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, NULL);
5419                 break;
5420         }
5421         case OBD_IOC_GET_OBJ_VERSION: {
5422                 struct mdt_thread_info *mti;
5423                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5424                 memset(mti, 0, sizeof *mti);
5425                 mti->mti_env = &env;
5426                 mti->mti_mdt = mdt;
5427                 mti->mti_exp = exp;
5428
5429                 rc = mdt_ioc_version_get(mti, karg);
5430                 break;
5431         }
5432         case OBD_IOC_CATLOGLIST:
5433                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg);
5434                 break;
5435         default:
5436                 rc = -EOPNOTSUPP;
5437                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5438                         mdt_obd_name(mdt), cmd, rc);
5439         }
5440
5441         lu_env_fini(&env);
5442         RETURN(rc);
5443 }
5444
5445 int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5446 {
5447         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5448         int rc;
5449         ENTRY;
5450
5451         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5452         RETURN(rc);
5453 }
5454
5455 int mdt_obd_postrecov(struct obd_device *obd)
5456 {
5457         struct lu_env env;
5458         int rc;
5459
5460         rc = lu_env_init(&env, LCT_MD_THREAD);
5461         if (rc)
5462                 RETURN(rc);
5463         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5464         lu_env_fini(&env);
5465         return rc;
5466 }
5467
5468 static struct obd_ops mdt_obd_device_ops = {
5469         .o_owner          = THIS_MODULE,
5470         .o_set_info_async = mdt_obd_set_info_async,
5471         .o_connect        = mdt_obd_connect,
5472         .o_reconnect      = mdt_obd_reconnect,
5473         .o_disconnect     = mdt_obd_disconnect,
5474         .o_init_export    = mdt_init_export,
5475         .o_destroy_export = mdt_destroy_export,
5476         .o_iocontrol      = mdt_iocontrol,
5477         .o_postrecov      = mdt_obd_postrecov,
5478 };
5479
5480 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5481                                          struct lu_device *d)
5482 {
5483         struct mdt_device *m = mdt_dev(d);
5484         ENTRY;
5485
5486         mdt_fini(env, m);
5487         RETURN(NULL);
5488 }
5489
5490 static struct lu_device *mdt_device_free(const struct lu_env *env,
5491                                          struct lu_device *d)
5492 {
5493         struct mdt_device *m = mdt_dev(d);
5494         ENTRY;
5495
5496         lu_device_fini(&m->mdt_lu_dev);
5497         OBD_FREE_PTR(m);
5498
5499         RETURN(NULL);
5500 }
5501
5502 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5503                                           struct lu_device_type *t,
5504                                           struct lustre_cfg *cfg)
5505 {
5506         struct lu_device  *l;
5507         struct mdt_device *m;
5508
5509         OBD_ALLOC_PTR(m);
5510         if (m != NULL) {
5511                 int rc;
5512
5513                 l = &m->mdt_lu_dev;
5514                 rc = mdt_init0(env, m, t, cfg);
5515                 if (rc != 0) {
5516                         mdt_device_free(env, l);
5517                         l = ERR_PTR(rc);
5518                         return l;
5519                 }
5520         } else
5521                 l = ERR_PTR(-ENOMEM);
5522         return l;
5523 }
5524
5525 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5526 LU_KEY_INIT(mdt, struct mdt_thread_info);
5527
5528 static void mdt_key_fini(const struct lu_context *ctx,
5529                          struct lu_context_key *key, void* data)
5530 {
5531         struct mdt_thread_info *info = data;
5532
5533         if (info->mti_big_lmm) {
5534                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5535                 info->mti_big_lmm = NULL;
5536                 info->mti_big_lmmsize = 0;
5537         }
5538         OBD_FREE_PTR(info);
5539 }
5540
5541 /* context key: mdt_thread_key */
5542 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5543
5544 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5545 {
5546         return lu_ucred(info->mti_env);
5547 }
5548
5549 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5550 {
5551         return lu_ucred_check(info->mti_env);
5552 }
5553
5554 /**
5555  * Enable/disable COS (Commit On Sharing).
5556  *
5557  * Set/Clear the COS flag in mdt options.
5558  *
5559  * \param mdt mdt device
5560  * \param val 0 disables COS, other values enable COS
5561  */
5562 void mdt_enable_cos(struct mdt_device *mdt, int val)
5563 {
5564         struct lu_env env;
5565         int rc;
5566
5567         mdt->mdt_opts.mo_cos = !!val;
5568         rc = lu_env_init(&env, LCT_LOCAL);
5569         if (unlikely(rc != 0)) {
5570                 CWARN("lu_env initialization failed with rc = %d,"
5571                       "cannot sync\n", rc);
5572                 return;
5573         }
5574         mdt_device_sync(&env, mdt);
5575         lu_env_fini(&env);
5576 }
5577
5578 /**
5579  * Check COS (Commit On Sharing) status.
5580  *
5581  * Return COS flag status.
5582  *
5583  * \param mdt mdt device
5584  */
5585 int mdt_cos_is_enabled(struct mdt_device *mdt)
5586 {
5587         return mdt->mdt_opts.mo_cos != 0;
5588 }
5589
5590 static struct lu_device_type_operations mdt_device_type_ops = {
5591         .ldto_device_alloc = mdt_device_alloc,
5592         .ldto_device_free  = mdt_device_free,
5593         .ldto_device_fini  = mdt_device_fini
5594 };
5595
5596 static struct lu_device_type mdt_device_type = {
5597         .ldt_tags     = LU_DEVICE_MD,
5598         .ldt_name     = LUSTRE_MDT_NAME,
5599         .ldt_ops      = &mdt_device_type_ops,
5600         .ldt_ctx_tags = LCT_MD_THREAD
5601 };
5602
5603 static int __init mdt_mod_init(void)
5604 {
5605         struct lprocfs_static_vars lvars;
5606         int rc;
5607
5608         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5609                  FID_NOBRACE_LEN + 1);
5610         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5611                  FID_LEN + 1);
5612         rc = lu_kmem_init(mdt_caches);
5613         if (rc)
5614                 return rc;
5615
5616         rc = mds_mod_init();
5617         if (rc)
5618                 GOTO(lu_fini, rc);
5619
5620         lprocfs_mdt_init_vars(&lvars);
5621         rc = class_register_type(&mdt_obd_device_ops, NULL,
5622                                  lvars.module_vars, LUSTRE_MDT_NAME,
5623                                  &mdt_device_type);
5624         if (rc)
5625                 GOTO(mds_fini, rc);
5626 lu_fini:
5627         if (rc)
5628                 lu_kmem_fini(mdt_caches);
5629 mds_fini:
5630         if (rc)
5631                 mds_mod_exit();
5632         return rc;
5633 }
5634
5635 static void __exit mdt_mod_exit(void)
5636 {
5637         class_unregister_type(LUSTRE_MDT_NAME);
5638         mds_mod_exit();
5639         lu_kmem_fini(mdt_caches);
5640 }
5641
5642 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5643 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5644 MODULE_LICENSE("GPL");
5645
5646 cfs_module(mdt, LUSTRE_VERSION_STRING, mdt_mod_init, mdt_mod_exit);