lustre/mdt/mdt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_handler.c
  37  *
  38  * Lustre Metadata Target (mdt) request handler
  39  *
  40  * Author: Peter Braam <braam@clusterfs.com>
  41  * Author: Andreas Dilger <adilger@clusterfs.com>
  42  * Author: Phil Schwan <phil@clusterfs.com>
  43  * Author: Mike Shaver <shaver@clusterfs.com>
  44  * Author: Nikita Danilov <nikita@clusterfs.com>
  45  * Author: Huang Hua <huanghua@clusterfs.com>
  46  * Author: Yury Umanets <umka@clusterfs.com>
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_MDS
  50
  51 #include <linux/module.h>
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  */
  55 #include <obd_support.h>
  56 #include <lustre_ioctl.h>
  57 /* struct ptlrpc_request */
  58 #include <lustre_net.h>
  59 /* struct obd_export */
  60 #include <lustre_export.h>
  61 /* struct obd_device */
  62 #include <obd.h>
  63 /* lu2dt_dev() */
  64 #include <dt_object.h>
  65 #include <lustre_mds.h>
  66 #include <lustre_log.h>
  67 #include "mdt_internal.h"
  68 #include <lustre_acl.h>
  69 #include <lustre_param.h>
  70 #include <lustre_quota.h>
  71 #include <lustre_lfsck.h>
  72 #include <lustre_nodemap.h>
  73
  74 mdl_mode_t mdt_mdl_lock_modes[] = {
  75         [LCK_MINMODE] = MDL_MINMODE,
  76         [LCK_EX]      = MDL_EX,
  77         [LCK_PW]      = MDL_PW,
  78         [LCK_PR]      = MDL_PR,
  79         [LCK_CW]      = MDL_CW,
  80         [LCK_CR]      = MDL_CR,
  81         [LCK_NL]      = MDL_NL,
  82         [LCK_GROUP]   = MDL_GROUP
  83 };
  84
  85 ldlm_mode_t mdt_dlm_lock_modes[] = {
  86         [MDL_MINMODE] = LCK_MINMODE,
  87         [MDL_EX]      = LCK_EX,
  88         [MDL_PW]      = LCK_PW,
  89         [MDL_PR]      = LCK_PR,
  90         [MDL_CW]      = LCK_CW,
  91         [MDL_CR]      = LCK_CR,
  92         [MDL_NL]      = LCK_NL,
  93         [MDL_GROUP]   = LCK_GROUP
  94 };
  95
  96 static struct mdt_device *mdt_dev(struct lu_device *d);
  97 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  98
  99 static const struct lu_object_operations mdt_obj_ops;
 100
 101 /* Slab for MDT object allocation */
 102 static struct kmem_cache *mdt_object_kmem;
 103
 104 /* For HSM restore handles */
 105 struct kmem_cache *mdt_hsm_cdt_kmem;
 106
 107 /* For HSM request handles */
 108 struct kmem_cache *mdt_hsm_car_kmem;
 109
 110 static struct lu_kmem_descr mdt_caches[] = {
 111         {
 112                 .ckd_cache = &mdt_object_kmem,
 113                 .ckd_name  = "mdt_obj",
 114                 .ckd_size  = sizeof(struct mdt_object)
 115         },
 116         {
 117                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 118                 .ckd_name       = "mdt_cdt_restore_handle",
 119                 .ckd_size       = sizeof(struct cdt_restore_handle)
 120         },
 121         {
 122                 .ckd_cache      = &mdt_hsm_car_kmem,
 123                 .ckd_name       = "mdt_cdt_agent_req",
 124                 .ckd_size       = sizeof(struct cdt_agent_req)
 125         },
 126         {
 127                 .ckd_cache = NULL
 128         }
 129 };
 130
 131 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 132 {
 133         if (!rep)
 134                 return 0;
 135         return rep->lock_policy_res1 & op_flag;
 136 }
 137
 138 void mdt_clear_disposition(struct mdt_thread_info *info,
 139                            struct ldlm_reply *rep, __u64 op_flag)
 140 {
 141         if (info) {
 142                 info->mti_opdata &= ~op_flag;
 143                 tgt_opdata_clear(info->mti_env, op_flag);
 144         }
 145         if (rep)
 146                 rep->lock_policy_res1 &= ~op_flag;
 147 }
 148
 149 void mdt_set_disposition(struct mdt_thread_info *info,
 150                          struct ldlm_reply *rep, __u64 op_flag)
 151 {
 152         if (info) {
 153                 info->mti_opdata |= op_flag;
 154                 tgt_opdata_set(info->mti_env, op_flag);
 155         }
 156         if (rep)
 157                 rep->lock_policy_res1 |= op_flag;
 158 }
 159
 160 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
 161 {
 162         lh->mlh_pdo_hash = 0;
 163         lh->mlh_reg_mode = lm;
 164         lh->mlh_rreg_mode = lm;
 165         lh->mlh_type = MDT_REG_LOCK;
 166 }
 167
 168 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
 169                        const struct lu_name *lname)
 170 {
 171         lh->mlh_reg_mode = lock_mode;
 172         lh->mlh_rreg_mode = lock_mode;
 173         lh->mlh_type = MDT_PDO_LOCK;
 174
 175         if (lu_name_is_valid(lname)) {
 176                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
 177                                                   lname->ln_namelen);
 178                 /* XXX Workaround for LU-2856
 179                  *
 180                  * Zero is a valid return value of full_name_hash, but
 181                  * several users of mlh_pdo_hash assume a non-zero
 182                  * hash value. We therefore map zero onto an
 183                  * arbitrary, but consistent value (1) to avoid
 184                  * problems further down the road. */
 185                 if (unlikely(lh->mlh_pdo_hash == 0))
 186                         lh->mlh_pdo_hash = 1;
 187         } else {
 188                 lh->mlh_pdo_hash = 0;
 189         }
 190 }
 191
 192 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 193                               struct mdt_lock_handle *lh)
 194 {
 195         mdl_mode_t mode;
 196         ENTRY;
 197
 198         /*
 199          * Any dir access needs couple of locks:
 200          *
 201          * 1) on part of dir we gonna take lookup/modify;
 202          *
 203          * 2) on whole dir to protect it from concurrent splitting and/or to
 204          * flush client's cache for readdir().
 205          *
 206          * so, for a given mode and object this routine decides what lock mode
 207          * to use for lock #2:
 208          *
 209          * 1) if caller's gonna lookup in dir then we need to protect dir from
 210          * being splitted only - LCK_CR
 211          *
 212          * 2) if caller's gonna modify dir then we need to protect dir from
 213          * being splitted and to flush cache - LCK_CW
 214          *
 215          * 3) if caller's gonna modify dir and that dir seems ready for
 216          * splitting then we need to protect it from any type of access
 217          * (lookup/modify/split) - LCK_EX --bzzz
 218          */
 219
 220         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 221         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 222
 223         /*
 224          * Ask underlaying level its opinion about preferable PDO lock mode
 225          * having access type passed as regular lock mode:
 226          *
 227          * - MDL_MINMODE means that lower layer does not want to specify lock
 228          * mode;
 229          *
 230          * - MDL_NL means that no PDO lock should be taken. This is used in some
 231          * cases. Say, for non-splittable directories no need to use PDO locks
 232          * at all.
 233          */
 234         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 235                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 236
 237         if (mode != MDL_MINMODE) {
 238                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 239         } else {
 240                 /*
 241                  * Lower layer does not want to specify locking mode. We do it
 242                  * our selves. No special protection is needed, just flush
 243                  * client's cache on modification and allow concurrent
 244                  * mondification.
 245                  */
 246                 switch (lh->mlh_reg_mode) {
 247                 case LCK_EX:
 248                         lh->mlh_pdo_mode = LCK_EX;
 249                         break;
 250                 case LCK_PR:
 251                         lh->mlh_pdo_mode = LCK_CR;
 252                         break;
 253                 case LCK_PW:
 254                         lh->mlh_pdo_mode = LCK_CW;
 255                         break;
 256                 default:
 257                         CERROR("Not expected lock type (0x%x)\n",
 258                                (int)lh->mlh_reg_mode);
 259                         LBUG();
 260                 }
 261         }
 262
 263         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 264         EXIT;
 265 }
 266
 267 static int mdt_getstatus(struct tgt_session_info *tsi)
 268 {
 269         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 270         struct mdt_device       *mdt = info->mti_mdt;
 271         struct mdt_body         *repbody;
 272         int                      rc;
 273
 274         ENTRY;
 275
 276         rc = mdt_check_ucred(info);
 277         if (rc)
 278                 GOTO(out, rc = err_serious(rc));
 279
 280         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
 281                 GOTO(out, rc = err_serious(-ENOMEM));
 282
 283         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 284         repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 285         repbody->mbo_valid |= OBD_MD_FLID;
 286
 287         EXIT;
 288 out:
 289         mdt_thread_info_fini(info);
 290         return rc;
 291 }
 292
 293 static int mdt_statfs(struct tgt_session_info *tsi)
 294 {
 295         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 296         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 297         struct md_device                *next = info->mti_mdt->mdt_child;
 298         struct ptlrpc_service_part      *svcpt;
 299         struct obd_statfs               *osfs;
 300         int                             rc;
 301
 302         ENTRY;
 303
 304         svcpt = req->rq_rqbd->rqbd_svcpt;
 305
 306         /* This will trigger a watchdog timeout */
 307         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 308                          (MDT_SERVICE_WATCHDOG_FACTOR *
 309                           at_get(&svcpt->scp_at_estimate)) + 1);
 310
 311         rc = mdt_check_ucred(info);
 312         if (rc)
 313                 GOTO(out, rc = err_serious(rc));
 314
 315         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 316                 GOTO(out, rc = err_serious(-ENOMEM));
 317
 318         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 319         if (!osfs)
 320                 GOTO(out, rc = -EPROTO);
 321
 322         /** statfs information are cached in the mdt_device */
 323         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 324                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 325                 /** statfs data is too old, get up-to-date one */
 326                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 327                 if (rc)
 328                         GOTO(out, rc);
 329                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 330                 info->mti_mdt->mdt_osfs = *osfs;
 331                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 332                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 333         } else {
 334                 /** use cached statfs data */
 335                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 336                 *osfs = info->mti_mdt->mdt_osfs;
 337                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 338         }
 339
 340         if (rc == 0)
 341                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 342 out:
 343         mdt_thread_info_fini(info);
 344         RETURN(rc);
 345 }
 346
 347 #ifdef CONFIG_FS_POSIX_ACL
 348 /*
 349  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 350  *
 351  * \param       info    thread info object
 352  * \param       repbody reply to pack ACLs into
 353  * \param       o       mdt object of file to examine
 354  * \param       nodemap nodemap of client to reply to
 355  * \retval      0       success
 356  * \retval      -errno  error getting or parsing ACL from disk
 357  */
 358 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 359                       struct mdt_object *o, struct lu_nodemap *nodemap)
 360 {
 361         const struct lu_env     *env = info->mti_env;
 362         struct md_object        *next = mdt_object_child(o);
 363         struct lu_buf           *buf = &info->mti_buf;
 364         int rc;
 365
 366         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 367         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 368                                            RCL_SERVER);
 369         if (buf->lb_len == 0)
 370                 return 0;
 371
 372         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 373         if (rc < 0) {
 374                 if (rc == -ENODATA) {
 375                         repbody->mbo_aclsize = 0;
 376                         repbody->mbo_valid |= OBD_MD_FLACL;
 377                         rc = 0;
 378                 } else if (rc == -EOPNOTSUPP) {
 379                         rc = 0;
 380                 } else {
 381                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 382                                mdt_obd_name(info->mti_mdt),
 383                                PFID(mdt_object_fid(o)), rc);
 384                 }
 385         } else {
 386                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 387                                      rc, NODEMAP_FS_TO_CLIENT);
 388                 /* if all ACLs mapped out, rc is still >= 0 */
 389                 if (rc < 0) {
 390                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 391                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
 392                                PFID(mdt_object_fid(o)), rc);
 393                 } else {
 394                         repbody->mbo_aclsize = rc;
 395                         repbody->mbo_valid |= OBD_MD_FLACL;
 396                         rc = 0;
 397                 }
 398         }
 399         return rc;
 400 }
 401 #endif
 402
 403 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 404                         const struct lu_attr *attr, const struct lu_fid *fid)
 405 {
 406         struct md_attr          *ma = &info->mti_attr;
 407         struct obd_export       *exp = info->mti_exp;
 408         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 409
 410         LASSERT(ma->ma_valid & MA_INODE);
 411
 412         if (attr->la_valid & LA_ATIME) {
 413                 b->mbo_atime = attr->la_atime;
 414                 b->mbo_valid |= OBD_MD_FLATIME;
 415         }
 416         if (attr->la_valid & LA_MTIME) {
 417                 b->mbo_mtime = attr->la_mtime;
 418                 b->mbo_valid |= OBD_MD_FLMTIME;
 419         }
 420         if (attr->la_valid & LA_CTIME) {
 421                 b->mbo_ctime = attr->la_ctime;
 422                 b->mbo_valid |= OBD_MD_FLCTIME;
 423         }
 424         if (attr->la_valid & LA_FLAGS) {
 425                 b->mbo_flags = attr->la_flags;
 426                 b->mbo_valid |= OBD_MD_FLFLAGS;
 427         }
 428         if (attr->la_valid & LA_NLINK) {
 429                 b->mbo_nlink = attr->la_nlink;
 430                 b->mbo_valid |= OBD_MD_FLNLINK;
 431         }
 432         if (attr->la_valid & LA_UID) {
 433                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 434                                             NODEMAP_FS_TO_CLIENT,
 435                                             attr->la_uid);
 436                 b->mbo_valid |= OBD_MD_FLUID;
 437         }
 438         if (attr->la_valid & LA_GID) {
 439                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 440                                             NODEMAP_FS_TO_CLIENT,
 441                                             attr->la_gid);
 442                 b->mbo_valid |= OBD_MD_FLGID;
 443         }
 444         b->mbo_mode = attr->la_mode;
 445         if (attr->la_valid & LA_MODE)
 446                 b->mbo_valid |= OBD_MD_FLMODE;
 447         if (attr->la_valid & LA_TYPE)
 448                 b->mbo_valid |= OBD_MD_FLTYPE;
 449
 450         if (fid != NULL) {
 451                 b->mbo_fid1 = *fid;
 452                 b->mbo_valid |= OBD_MD_FLID;
 453                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid="LPX64"\n",
 454                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 455         }
 456
 457         if (info != NULL)
 458                 mdt_body_reverse_idmap(info, b);
 459
 460         if (!(attr->la_valid & LA_TYPE))
 461                 return;
 462
 463         b->mbo_rdev   = attr->la_rdev;
 464         b->mbo_size   = attr->la_size;
 465         b->mbo_blocks = attr->la_blocks;
 466
 467         if (!S_ISREG(attr->la_mode)) {
 468                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 469         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 470                 /* means no objects are allocated on osts. */
 471                 LASSERT(!(ma->ma_valid & MA_LOV));
 472                 /* just ignore blocks occupied by extend attributes on MDS */
 473                 b->mbo_blocks = 0;
 474                 /* if no object is allocated on osts, the size on mds is valid.
 475                  * b=22272 */
 476                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 477         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 478                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 479                 /* A released file stores its size on MDS. */
 480                 /* But return 1 block for released file, unless tools like tar
 481                  * will consider it fully sparse. (LU-3864)
 482                  */
 483                 if (unlikely(b->mbo_size == 0))
 484                         b->mbo_blocks = 0;
 485                 else
 486                         b->mbo_blocks = 1;
 487                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 488         }
 489
 490         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 491                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 492                        PFID(fid), (unsigned long long)b->mbo_size);
 493 }
 494
 495 static inline int mdt_body_has_lov(const struct lu_attr *la,
 496                                    const struct mdt_body *body)
 497 {
 498         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 499                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 500 }
 501
 502 void mdt_client_compatibility(struct mdt_thread_info *info)
 503 {
 504         struct mdt_body       *body;
 505         struct ptlrpc_request *req = mdt_info_req(info);
 506         struct obd_export     *exp = req->rq_export;
 507         struct md_attr        *ma = &info->mti_attr;
 508         struct lu_attr        *la = &ma->ma_attr;
 509         ENTRY;
 510
 511         if (exp_connect_layout(exp))
 512                 /* the client can deal with 16-bit lmm_stripe_count */
 513                 RETURN_EXIT;
 514
 515         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 516
 517         if (!mdt_body_has_lov(la, body))
 518                 RETURN_EXIT;
 519
 520         /* now we have a reply with a lov for a client not compatible with the
 521          * layout lock so we have to clean the layout generation number */
 522         if (S_ISREG(la->la_mode))
 523                 ma->ma_lmm->lmm_layout_gen = 0;
 524         EXIT;
 525 }
 526
 527 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 528                                    struct mdt_object *o)
 529 {
 530         const struct lu_env *env = info->mti_env;
 531         int rc, rc2;
 532
 533         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 534                           XATTR_NAME_LOV);
 535
 536         if (rc == -ENODATA)
 537                 rc = 0;
 538
 539         if (rc < 0)
 540                 goto out;
 541
 542         /* Is it a directory? Let's check for the LMV as well */
 543         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 544                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 545                                    XATTR_NAME_LMV);
 546
 547                 if (rc2 == -ENODATA)
 548                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 549                                            &LU_BUF_NULL,
 550                                            XATTR_NAME_DEFAULT_LMV);
 551
 552                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 553                         rc = rc2;
 554         }
 555
 556 out:
 557         return rc;
 558 }
 559
 560 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 561                       const char *name)
 562 {
 563         const struct lu_env *env = info->mti_env;
 564         int rc;
 565         ENTRY;
 566
 567         LASSERT(info->mti_big_lmm_used == 0);
 568         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 569         if (rc < 0)
 570                 RETURN(rc);
 571
 572         /* big_lmm may need to be grown */
 573         if (info->mti_big_lmmsize < rc) {
 574                 int size = size_roundup_power2(rc);
 575
 576                 if (info->mti_big_lmmsize > 0) {
 577                         /* free old buffer */
 578                         LASSERT(info->mti_big_lmm);
 579                         OBD_FREE_LARGE(info->mti_big_lmm,
 580                                        info->mti_big_lmmsize);
 581                         info->mti_big_lmm = NULL;
 582                         info->mti_big_lmmsize = 0;
 583                 }
 584
 585                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 586                 if (info->mti_big_lmm == NULL)
 587                         RETURN(-ENOMEM);
 588                 info->mti_big_lmmsize = size;
 589         }
 590         LASSERT(info->mti_big_lmmsize >= rc);
 591
 592         info->mti_buf.lb_buf = info->mti_big_lmm;
 593         info->mti_buf.lb_len = info->mti_big_lmmsize;
 594         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 595
 596         RETURN(rc);
 597 }
 598
 599 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 600                    struct md_attr *ma, const char *name)
 601 {
 602         struct md_object *next = mdt_object_child(o);
 603         struct lu_buf    *buf = &info->mti_buf;
 604         int rc;
 605
 606         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 607                 buf->lb_buf = ma->ma_lmm;
 608                 buf->lb_len = ma->ma_lmm_size;
 609                 LASSERT(!(ma->ma_valid & MA_LOV));
 610         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 611                 buf->lb_buf = ma->ma_lmv;
 612                 buf->lb_len = ma->ma_lmv_size;
 613                 LASSERT(!(ma->ma_valid & MA_LMV));
 614         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 615                 buf->lb_buf = ma->ma_lmv;
 616                 buf->lb_len = ma->ma_lmv_size;
 617                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 618         } else {
 619                 return -EINVAL;
 620         }
 621
 622         rc = mo_xattr_get(info->mti_env, next, buf, name);
 623         if (rc > 0) {
 624
 625 got:
 626                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 627                         if (info->mti_big_lmm_used)
 628                                 ma->ma_lmm = info->mti_big_lmm;
 629
 630                         /* NOT return LOV EA with hole to old client. */
 631                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 632                                      LOV_PATTERN_F_HOLE) &&
 633                             !(exp_connect_flags(info->mti_exp) &
 634                               OBD_CONNECT_LFSCK)) {
 635                                 return -EIO;
 636                         } else {
 637                                 ma->ma_lmm_size = rc;
 638                                 ma->ma_valid |= MA_LOV;
 639                         }
 640                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 641                         if (info->mti_big_lmm_used)
 642                                 ma->ma_lmv = info->mti_big_lmm;
 643
 644                         ma->ma_lmv_size = rc;
 645                         ma->ma_valid |= MA_LMV;
 646                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 647                         ma->ma_lmv_size = rc;
 648                         ma->ma_valid |= MA_LMV_DEF;
 649                 }
 650
 651                 /* Update mdt_max_mdsize so all clients will be aware that */
 652                 if (info->mti_mdt->mdt_max_mdsize < rc)
 653                         info->mti_mdt->mdt_max_mdsize = rc;
 654
 655                 rc = 0;
 656         } else if (rc == -ENODATA) {
 657                 /* no LOV EA */
 658                 rc = 0;
 659         } else if (rc == -ERANGE) {
 660                 /* Default LMV has fixed size, so it must be able to fit
 661                  * in the original buffer */
 662                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 663                         return rc;
 664                 rc = mdt_big_xattr_get(info, o, name);
 665                 if (rc > 0) {
 666                         info->mti_big_lmm_used = 1;
 667                         goto got;
 668                 }
 669         }
 670
 671         return rc;
 672 }
 673
 674 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 675                              struct mdt_object *o, struct lu_fid *pfid)
 676 {
 677         struct lu_buf           *buf = &info->mti_buf;
 678         struct link_ea_header   *leh;
 679         struct link_ea_entry    *lee;
 680         int                      rc;
 681         ENTRY;
 682
 683         buf->lb_buf = info->mti_big_lmm;
 684         buf->lb_len = info->mti_big_lmmsize;
 685         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 686                           buf, XATTR_NAME_LINK);
 687         /* ignore errors, MA_PFID won't be set and it is
 688          * up to the caller to treat this as an error */
 689         if (rc == -ERANGE || buf->lb_len == 0) {
 690                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 691                 buf->lb_buf = info->mti_big_lmm;
 692                 buf->lb_len = info->mti_big_lmmsize;
 693         }
 694
 695         if (rc < 0)
 696                 RETURN(rc);
 697         if (rc < sizeof(*leh)) {
 698                 CERROR("short LinkEA on "DFID": rc = %d\n",
 699                        PFID(mdt_object_fid(o)), rc);
 700                 RETURN(-ENODATA);
 701         }
 702
 703         leh = (struct link_ea_header *) buf->lb_buf;
 704         lee = (struct link_ea_entry *)(leh + 1);
 705         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 706                 leh->leh_magic = LINK_EA_MAGIC;
 707                 leh->leh_reccount = __swab32(leh->leh_reccount);
 708                 leh->leh_len = __swab64(leh->leh_len);
 709         }
 710         if (leh->leh_magic != LINK_EA_MAGIC)
 711                 RETURN(-EINVAL);
 712         if (leh->leh_reccount == 0)
 713                 RETURN(-ENODATA);
 714
 715         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 716         fid_be_to_cpu(pfid, pfid);
 717
 718         RETURN(0);
 719 }
 720
 721 int mdt_attr_get_complex(struct mdt_thread_info *info,
 722                          struct mdt_object *o, struct md_attr *ma)
 723 {
 724         const struct lu_env *env = info->mti_env;
 725         struct md_object    *next = mdt_object_child(o);
 726         struct lu_buf       *buf = &info->mti_buf;
 727         int                  need = ma->ma_need;
 728         int                  rc = 0, rc2;
 729         u32                  mode;
 730         ENTRY;
 731
 732         ma->ma_valid = 0;
 733
 734         if (mdt_object_exists(o) == 0)
 735                 GOTO(out, rc = -ENOENT);
 736         mode = lu_object_attr(&next->mo_lu);
 737
 738         if (need & MA_INODE) {
 739                 ma->ma_need = MA_INODE;
 740                 rc = mo_attr_get(env, next, ma);
 741                 if (rc)
 742                         GOTO(out, rc);
 743                 ma->ma_valid |= MA_INODE;
 744         }
 745
 746         if (need & MA_PFID) {
 747                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 748                 if (rc == 0)
 749                         ma->ma_valid |= MA_PFID;
 750                 /* ignore this error, parent fid is not mandatory */
 751                 rc = 0;
 752         }
 753
 754         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 755                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 756                 if (rc)
 757                         GOTO(out, rc);
 758         }
 759
 760         if (need & MA_LMV && S_ISDIR(mode)) {
 761                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 762                 if (rc != 0)
 763                         GOTO(out, rc);
 764         }
 765
 766         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 767                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 768                 if (rc != 0)
 769                         GOTO(out, rc);
 770         }
 771
 772         if (need & MA_HSM && S_ISREG(mode)) {
 773                 buf->lb_buf = info->mti_xattr_buf;
 774                 buf->lb_len = sizeof(info->mti_xattr_buf);
 775                 CLASSERT(sizeof(struct hsm_attrs) <=
 776                          sizeof(info->mti_xattr_buf));
 777                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 778                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 779                 if (rc2 == 0)
 780                         ma->ma_valid |= MA_HSM;
 781                 else if (rc2 < 0 && rc2 != -ENODATA)
 782                         GOTO(out, rc = rc2);
 783         }
 784
 785 #ifdef CONFIG_FS_POSIX_ACL
 786         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 787                 buf->lb_buf = ma->ma_acl;
 788                 buf->lb_len = ma->ma_acl_size;
 789                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 790                 if (rc2 > 0) {
 791                         ma->ma_acl_size = rc2;
 792                         ma->ma_valid |= MA_ACL_DEF;
 793                 } else if (rc2 == -ENODATA) {
 794                         /* no ACLs */
 795                         ma->ma_acl_size = 0;
 796                 } else
 797                         GOTO(out, rc = rc2);
 798         }
 799 #endif
 800 out:
 801         ma->ma_need = need;
 802         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 803                rc, ma->ma_valid, ma->ma_lmm);
 804         RETURN(rc);
 805 }
 806
 807 static int mdt_getattr_internal(struct mdt_thread_info *info,
 808                                 struct mdt_object *o, int ma_need)
 809 {
 810         struct md_object        *next = mdt_object_child(o);
 811         const struct mdt_body   *reqbody = info->mti_body;
 812         struct ptlrpc_request   *req = mdt_info_req(info);
 813         struct md_attr          *ma = &info->mti_attr;
 814         struct lu_attr          *la = &ma->ma_attr;
 815         struct req_capsule      *pill = info->mti_pill;
 816         const struct lu_env     *env = info->mti_env;
 817         struct mdt_body         *repbody;
 818         struct lu_buf           *buffer = &info->mti_buf;
 819         struct obd_export       *exp = info->mti_exp;
 820         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 821         int                      rc;
 822         int                      is_root;
 823         ENTRY;
 824
 825         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 826                 RETURN(err_serious(-ENOMEM));
 827
 828         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 829
 830         ma->ma_valid = 0;
 831
 832         if (mdt_object_remote(o)) {
 833                 /* This object is located on remote node.*/
 834                 /* Return -ENOTSUPP for old client */
 835                 if (!mdt_is_dne_client(req->rq_export))
 836                         GOTO(out, rc = -ENOTSUPP);
 837
 838                 repbody->mbo_fid1 = *mdt_object_fid(o);
 839                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
 840                 GOTO(out, rc = 0);
 841         }
 842
 843         if (reqbody->mbo_eadatasize > 0) {
 844                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 845                 if (buffer->lb_buf == NULL)
 846                         GOTO(out, rc = -EPROTO);
 847                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
 848                                                       RCL_SERVER);
 849         } else {
 850                 buffer->lb_buf = NULL;
 851                 buffer->lb_len = 0;
 852                 ma_need &= ~(MA_LOV | MA_LMV);
 853                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 854                        mdt_obd_name(info->mti_mdt),
 855                        req->rq_export->exp_client_uuid.uuid);
 856         }
 857
 858         /* If it is dir object and client require MEA, then we got MEA */
 859         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 860             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 861                 /* Assumption: MDT_MD size is enough for lmv size. */
 862                 ma->ma_lmv = buffer->lb_buf;
 863                 ma->ma_lmv_size = buffer->lb_len;
 864                 ma->ma_need = MA_INODE;
 865                 if (ma->ma_lmv_size > 0) {
 866                         if (reqbody->mbo_valid & OBD_MD_MEA)
 867                                 ma->ma_need |= MA_LMV;
 868                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
 869                                 ma->ma_need |= MA_LMV_DEF;
 870                 }
 871         } else {
 872                 ma->ma_lmm = buffer->lb_buf;
 873                 ma->ma_lmm_size = buffer->lb_len;
 874                 ma->ma_need = MA_INODE | MA_HSM;
 875                 if (ma->ma_lmm_size > 0)
 876                         ma->ma_need |= MA_LOV;
 877         }
 878
 879         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 880             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
 881             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 882                 /* get default stripe info for this dir. */
 883                 ma->ma_need |= MA_LOV_DEF;
 884         }
 885         ma->ma_need |= ma_need;
 886
 887         rc = mdt_attr_get_complex(info, o, ma);
 888         if (unlikely(rc)) {
 889                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 890                        mdt_obd_name(info->mti_mdt),
 891                        PFID(mdt_object_fid(o)), rc);
 892                 RETURN(rc);
 893         }
 894
 895         /* if file is released, check if a restore is running */
 896         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
 897             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
 898                 repbody->mbo_t_state = MS_RESTORE;
 899                 repbody->mbo_valid |= OBD_MD_TSTATE;
 900         }
 901
 902         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 903
 904         /* the Lustre protocol supposes to return default striping
 905          * on the user-visible root if explicitly requested */
 906         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 907             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 908                 struct lu_fid      rootfid;
 909                 struct mdt_object *root;
 910                 struct mdt_device *mdt = info->mti_mdt;
 911
 912                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 913                 if (rc)
 914                         RETURN(rc);
 915                 root = mdt_object_find(env, mdt, &rootfid);
 916                 if (IS_ERR(root))
 917                         RETURN(PTR_ERR(root));
 918                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
 919                 mdt_object_put(info->mti_env, root);
 920                 if (unlikely(rc)) {
 921                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 922                                mdt_obd_name(info->mti_mdt),
 923                                PFID(mdt_object_fid(o)), rc);
 924                         RETURN(rc);
 925                 }
 926         }
 927
 928         if (likely(ma->ma_valid & MA_INODE))
 929                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 930         else
 931                 RETURN(-EFAULT);
 932
 933         if (mdt_body_has_lov(la, reqbody)) {
 934                 if (ma->ma_valid & MA_LOV) {
 935                         LASSERT(ma->ma_lmm_size);
 936                         repbody->mbo_eadatasize = ma->ma_lmm_size;
 937                         if (S_ISDIR(la->la_mode))
 938                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
 939                         else
 940                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
 941                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
 942                 }
 943                 if (ma->ma_valid & MA_LMV) {
 944                         /* Return -ENOTSUPP for old client */
 945                         if (!mdt_is_striped_client(req->rq_export))
 946                                 RETURN(-ENOTSUPP);
 947
 948                         LASSERT(S_ISDIR(la->la_mode));
 949                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
 950                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 951                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 952                 }
 953                 if (ma->ma_valid & MA_LMV_DEF) {
 954                         /* Return -ENOTSUPP for old client */
 955                         if (!mdt_is_striped_client(req->rq_export))
 956                                 RETURN(-ENOTSUPP);
 957                         LASSERT(S_ISDIR(la->la_mode));
 958                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 959                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
 960                                                OBD_MD_DEFAULT_MEA);
 961                 }
 962         } else if (S_ISLNK(la->la_mode) &&
 963                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
 964                 buffer->lb_buf = ma->ma_lmm;
 965                 /* eadatasize from client includes NULL-terminator, so
 966                  * there is no need to read it */
 967                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
 968                 rc = mo_readlink(env, next, buffer);
 969                 if (unlikely(rc <= 0)) {
 970                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 971                                mdt_obd_name(info->mti_mdt),
 972                                PFID(mdt_object_fid(o)), rc);
 973                         rc = -EFAULT;
 974                 } else {
 975                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 976
 977                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 978                                 rc -= 2;
 979                         repbody->mbo_valid |= OBD_MD_LINKNAME;
 980                         /* we need to report back size with NULL-terminator
 981                          * because client expects that */
 982                         repbody->mbo_eadatasize = rc + 1;
 983                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
 984                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 985                                        "on "DFID ", expected %d\n",
 986                                        mdt_obd_name(info->mti_mdt),
 987                                        rc, PFID(mdt_object_fid(o)),
 988                                        reqbody->mbo_eadatasize - 1);
 989                         /* NULL terminate */
 990                         ((char *)ma->ma_lmm)[rc] = 0;
 991
 992                         /* If the total CDEBUG() size is larger than a page, it
 993                          * will print a warning to the console, avoid this by
 994                          * printing just the last part of the symlink. */
 995                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
 996                                print_limit < rc ? "..." : "", print_limit,
 997                                (char *)ma->ma_lmm + rc - print_limit, rc);
 998                         rc = 0;
 999                 }
1000         }
1001
1002         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1003                 repbody->mbo_max_cookiesize = 0;
1004                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1005                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1006                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
1007                        "MAX_COOKIE to : %d:%d\n", repbody->mbo_max_mdsize,
1008                        repbody->mbo_max_cookiesize);
1009         }
1010
1011         if (exp_connect_rmtclient(info->mti_exp) &&
1012             reqbody->mbo_valid & OBD_MD_FLRMTPERM) {
1013                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
1014
1015                 /* mdt_getattr_lock only */
1016                 rc = mdt_pack_remote_perm(info, o, buf);
1017                 if (rc) {
1018                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
1019                         repbody->mbo_aclsize = 0;
1020                         RETURN(rc);
1021                 } else {
1022                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
1023                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
1024                 }
1025         }
1026 #ifdef CONFIG_FS_POSIX_ACL
1027         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1028                  (reqbody->mbo_valid & OBD_MD_FLACL))
1029                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1030 #endif
1031
1032 out:
1033         if (rc == 0)
1034                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1035
1036         RETURN(rc);
1037 }
1038
1039 static int mdt_getattr(struct tgt_session_info *tsi)
1040 {
1041         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1042         struct mdt_object       *obj = info->mti_object;
1043         struct req_capsule      *pill = info->mti_pill;
1044         struct mdt_body         *reqbody;
1045         struct mdt_body         *repbody;
1046         int rc, rc2;
1047         ENTRY;
1048
1049         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1050         LASSERT(reqbody);
1051         LASSERT(obj != NULL);
1052         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1053
1054         /* Unlike intent case where we need to pre-fill out buffers early on
1055          * in intent policy for ldlm reasons, here we can have a much better
1056          * guess at EA size by just reading it from disk.
1057          * Exceptions are readdir and (missing) directory striping */
1058         /* Readlink */
1059         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1060                 /* No easy way to know how long is the symlink, but it cannot
1061                  * be more than PATH_MAX, so we allocate +1 */
1062                 rc = PATH_MAX + 1;
1063
1064         /* A special case for fs ROOT: getattr there might fetch
1065          * default EA for entire fs, not just for this dir!
1066          */
1067         } else if (lu_fid_eq(mdt_object_fid(obj),
1068                              &info->mti_mdt->mdt_md_root_fid) &&
1069                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1070                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1071                                                                  MDS_GETATTR)) {
1072                 /* Should the default strping be bigger, mdt_fix_reply
1073                  * will reallocate */
1074                 rc = DEF_REP_MD_SIZE;
1075         } else {
1076                 /* Read the actual EA size from disk */
1077                 rc = mdt_attr_get_eabuf_size(info, obj);
1078         }
1079
1080         if (rc < 0)
1081                 GOTO(out, rc = err_serious(rc));
1082
1083         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1084
1085         rc = req_capsule_server_pack(pill);
1086         if (unlikely(rc != 0))
1087                 GOTO(out, rc = err_serious(rc));
1088
1089         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1090         LASSERT(repbody != NULL);
1091         repbody->mbo_eadatasize = 0;
1092         repbody->mbo_aclsize = 0;
1093
1094         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1095                 rc = mdt_init_ucred(info, reqbody);
1096         else
1097                 rc = mdt_check_ucred(info);
1098         if (unlikely(rc))
1099                 GOTO(out_shrink, rc);
1100
1101         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1102
1103         rc = mdt_getattr_internal(info, obj, 0);
1104         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1105                 mdt_exit_ucred(info);
1106         EXIT;
1107 out_shrink:
1108         mdt_client_compatibility(info);
1109         rc2 = mdt_fix_reply(info);
1110         if (rc == 0)
1111                 rc = rc2;
1112 out:
1113         mdt_thread_info_fini(info);
1114         return rc;
1115 }
1116
1117 /**
1118  * Exchange MOF_LOV_CREATED flags between two objects after a
1119  * layout swap. No assumption is made on whether o1 or o2 have
1120  * created objects or not.
1121  *
1122  * \param[in,out] o1    First swap layout object
1123  * \param[in,out] o2    Second swap layout object
1124  */
1125 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1126 {
1127         __u64   o1_flags;
1128
1129         mutex_lock(&o1->mot_lov_mutex);
1130         mutex_lock(&o2->mot_lov_mutex);
1131
1132         o1_flags = o1->mot_flags;
1133         o1->mot_flags = (o1->mot_flags & ~MOF_LOV_CREATED) |
1134                         (o2->mot_flags & MOF_LOV_CREATED);
1135
1136         o2->mot_flags = (o2->mot_flags & ~MOF_LOV_CREATED) |
1137                         (o1_flags & MOF_LOV_CREATED);
1138
1139         mutex_unlock(&o2->mot_lov_mutex);
1140         mutex_unlock(&o1->mot_lov_mutex);
1141 }
1142
1143 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1144 {
1145         struct mdt_thread_info  *info;
1146         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1147         struct obd_export       *exp = req->rq_export;
1148         struct mdt_object       *o1, *o2, *o;
1149         struct mdt_lock_handle  *lh1, *lh2;
1150         struct mdc_swap_layouts *msl;
1151         int                      rc;
1152         ENTRY;
1153
1154         /* client does not support layout lock, so layout swaping
1155          * is disabled.
1156          * FIXME: there is a problem for old clients which don't support
1157          * layout lock yet. If those clients have already opened the file
1158          * they won't be notified at all so that old layout may still be
1159          * used to do IO. This can be fixed after file release is landed by
1160          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1161         if (!exp_connect_layout(exp))
1162                 RETURN(-EOPNOTSUPP);
1163
1164         info = tsi2mdt_info(tsi);
1165
1166         if (info->mti_dlm_req != NULL)
1167                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1168
1169         o1 = info->mti_object;
1170         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1171                                 &info->mti_body->mbo_fid2);
1172         if (IS_ERR(o))
1173                 GOTO(out, rc = PTR_ERR(o));
1174
1175         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1176                 GOTO(put, rc = -ENOENT);
1177
1178         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1179         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1180                 GOTO(put, rc);
1181
1182         if (rc < 0)
1183                 swap(o1, o2);
1184
1185         /* permission check. Make sure the calling process having permission
1186          * to write both files. */
1187         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1188                                 MAY_WRITE);
1189         if (rc < 0)
1190                 GOTO(put, rc);
1191
1192         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1193                                 MAY_WRITE);
1194         if (rc < 0)
1195                 GOTO(put, rc);
1196
1197         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1198         if (msl == NULL)
1199                 GOTO(put, rc = -EPROTO);
1200
1201         lh1 = &info->mti_lh[MDT_LH_NEW];
1202         mdt_lock_reg_init(lh1, LCK_EX);
1203         lh2 = &info->mti_lh[MDT_LH_OLD];
1204         mdt_lock_reg_init(lh2, LCK_EX);
1205
1206         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1207                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1208         if (rc < 0)
1209                 GOTO(put, rc);
1210
1211         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1212                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1213         if (rc < 0)
1214                 GOTO(unlock1, rc);
1215
1216         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1217                              mdt_object_child(o2), msl->msl_flags);
1218         if (rc < 0)
1219                 GOTO(unlock2, rc);
1220
1221         mdt_swap_lov_flag(o1, o2);
1222
1223 unlock2:
1224         mdt_object_unlock(info, o2, lh2, rc);
1225 unlock1:
1226         mdt_object_unlock(info, o1, lh1, rc);
1227 put:
1228         mdt_object_put(info->mti_env, o);
1229 out:
1230         mdt_thread_info_fini(info);
1231         RETURN(rc);
1232 }
1233
1234 static int mdt_raw_lookup(struct mdt_thread_info *info,
1235                           struct mdt_object *parent,
1236                           const struct lu_name *lname,
1237                           struct ldlm_reply *ldlm_rep)
1238 {
1239         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1240         int              rc;
1241         ENTRY;
1242
1243         LASSERT(!info->mti_cross_ref);
1244
1245         /* Only got the fid of this obj by name */
1246         fid_zero(child_fid);
1247         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1248                         lname, child_fid, &info->mti_spec);
1249         if (rc == 0) {
1250                 struct mdt_body *repbody;
1251
1252                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1253                 repbody->mbo_fid1 = *child_fid;
1254                 repbody->mbo_valid = OBD_MD_FLID;
1255                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1256         } else if (rc == -ENOENT) {
1257                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1258         }
1259
1260         RETURN(rc);
1261 }
1262
1263 /*
1264  * UPDATE lock should be taken against parent, and be release before exit;
1265  * child_bits lock should be taken against child, and be returned back:
1266  *            (1)normal request should release the child lock;
1267  *            (2)intent request will grant the lock to client.
1268  */
1269 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1270                                  struct mdt_lock_handle *lhc,
1271                                  __u64 child_bits,
1272                                  struct ldlm_reply *ldlm_rep)
1273 {
1274         struct ptlrpc_request  *req       = mdt_info_req(info);
1275         struct mdt_body        *reqbody   = NULL;
1276         struct mdt_object      *parent    = info->mti_object;
1277         struct mdt_object      *child;
1278         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1279         struct lu_name         *lname     = NULL;
1280         struct mdt_lock_handle *lhp       = NULL;
1281         struct ldlm_lock       *lock;
1282         bool                    is_resent;
1283         bool                    try_layout;
1284         int                     ma_need = 0;
1285         int                     rc;
1286         ENTRY;
1287
1288         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1289         LASSERT(ergo(is_resent,
1290                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1291
1292         if (parent == NULL)
1293                 RETURN(-ENOENT);
1294
1295         if (info->mti_cross_ref) {
1296                 /* Only getattr on the child. Parent is on another node. */
1297                 mdt_set_disposition(info, ldlm_rep,
1298                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1299                 child = parent;
1300                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1301                        "ldlm_rep = %p\n",
1302                        PFID(mdt_object_fid(child)), ldlm_rep);
1303
1304                 rc = mdt_check_resent_lock(info, child, lhc);
1305                 if (rc < 0) {
1306                         RETURN(rc);
1307                 } else if (rc > 0) {
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 or layout
1313                          * lock is needed here but update lock is.
1314                          */
1315                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1316                                         MDS_INODELOCK_LAYOUT);
1317                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1318
1319                         rc = mdt_object_lock(info, child, lhc, child_bits,
1320                                              MDT_LOCAL_LOCK);
1321                         if (rc < 0)
1322                                 RETURN(rc);
1323                 }
1324
1325                 /* Finally, we can get attr for child. */
1326                 if (!mdt_object_exists(child)) {
1327                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1328                                         &child->mot_obj,
1329                                         "remote object doesn't exist.\n");
1330                         mdt_object_unlock(info, child, lhc, 1);
1331                         RETURN(-ENOENT);
1332                 }
1333
1334                 rc = mdt_getattr_internal(info, child, 0);
1335                 if (unlikely(rc != 0))
1336                         mdt_object_unlock(info, child, lhc, 1);
1337
1338                 RETURN(rc);
1339         }
1340
1341         lname = &info->mti_name;
1342         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1343
1344         if (lu_name_is_valid(lname)) {
1345                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1346                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1347                        PNAME(lname), ldlm_rep);
1348         } else {
1349                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1350                 if (unlikely(reqbody == NULL))
1351                         RETURN(err_serious(-EPROTO));
1352
1353                 *child_fid = reqbody->mbo_fid2;
1354
1355                 if (unlikely(!fid_is_sane(child_fid)))
1356                         RETURN(err_serious(-EINVAL));
1357
1358                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1359                        "ldlm_rep = %p\n",
1360                        PFID(mdt_object_fid(parent)),
1361                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1362         }
1363
1364         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1365
1366         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1367                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1368                                 &parent->mot_obj,
1369                                 "Parent doesn't exist!\n");
1370                 RETURN(-ESTALE);
1371         }
1372
1373         if (mdt_object_remote(parent)) {
1374                 CERROR("%s: parent "DFID" is on remote target\n",
1375                        mdt_obd_name(info->mti_mdt),
1376                        PFID(mdt_object_fid(parent)));
1377                 RETURN(-EIO);
1378         }
1379
1380         if (lu_name_is_valid(lname)) {
1381                 /* Always allow to lookup ".." */
1382                 if (unlikely(lname->ln_namelen == 2 &&
1383                              lname->ln_name[0] == '.' &&
1384                              lname->ln_name[1] == '.'))
1385                         info->mti_spec.sp_permitted = 1;
1386
1387                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1388                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1389
1390                         RETURN(rc);
1391                 }
1392
1393                 /* step 1: lock parent only if parent is a directory */
1394                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1395                         lhp = &info->mti_lh[MDT_LH_PARENT];
1396                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1397                         rc = mdt_object_lock(info, parent, lhp,
1398                                              MDS_INODELOCK_UPDATE,
1399                                              MDT_LOCAL_LOCK);
1400                         if (unlikely(rc != 0))
1401                                 RETURN(rc);
1402                 }
1403
1404                 /* step 2: lookup child's fid by name */
1405                 fid_zero(child_fid);
1406                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1407                                 child_fid, &info->mti_spec);
1408                 if (rc == -ENOENT)
1409                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1410
1411                 if (rc != 0)
1412                         GOTO(out_parent, rc);
1413         }
1414
1415         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1416
1417         /*
1418          *step 3: find the child object by fid & lock it.
1419          *        regardless if it is local or remote.
1420          *
1421          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1422          *      set parent dir fid the same as child fid in getattr by fid case
1423          *      we should not lu_object_find() the object again, could lead
1424          *      to hung if there is a concurrent unlink destroyed the object.
1425          */
1426         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1427                 mdt_object_get(info->mti_env, parent);
1428                 child = parent;
1429         } else {
1430                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1431                                         child_fid);
1432         }
1433
1434         if (unlikely(IS_ERR(child)))
1435                 GOTO(out_parent, rc = PTR_ERR(child));
1436
1437         rc = mdt_check_resent_lock(info, child, lhc);
1438         if (rc < 0) {
1439                 GOTO(out_child, rc);
1440         } else if (rc > 0) {
1441                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1442                 mdt_lock_handle_init(lhc);
1443                 mdt_lock_reg_init(lhc, LCK_PR);
1444                 try_layout = false;
1445
1446                 if (!mdt_object_exists(child)) {
1447                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1448                                         &child->mot_obj,
1449                                         "Object doesn't exist!\n");
1450                         GOTO(out_child, rc = -ENOENT);
1451                 }
1452
1453                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1454                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1455                         struct md_attr *ma = &info->mti_attr;
1456
1457                         ma->ma_valid = 0;
1458                         ma->ma_need = MA_INODE;
1459                         rc = mdt_attr_get_complex(info, child, ma);
1460                         if (unlikely(rc != 0))
1461                                 GOTO(out_child, rc);
1462
1463                         /* If the file has not been changed for some time, we
1464                          * return not only a LOOKUP lock, but also an UPDATE
1465                          * lock and this might save us RPC on later STAT. For
1466                          * directories, it also let negative dentry cache start
1467                          * working for this dir. */
1468                         if (ma->ma_valid & MA_INODE &&
1469                             ma->ma_attr.la_valid & LA_CTIME &&
1470                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1471                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1472                                 child_bits |= MDS_INODELOCK_UPDATE;
1473                 }
1474
1475                 /* layout lock must be granted in a best-effort way
1476                  * for IT operations */
1477                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1478                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1479                     exp_connect_layout(info->mti_exp) &&
1480                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1481                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1482                         /* try to grant layout lock for regular file. */
1483                         try_layout = true;
1484                 }
1485
1486                 rc = 0;
1487                 if (try_layout) {
1488                         child_bits |= MDS_INODELOCK_LAYOUT;
1489                         /* try layout lock, it may fail to be granted due to
1490                          * contention at LOOKUP or UPDATE */
1491                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1492                                                  MDT_CROSS_LOCK)) {
1493                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1494                                 LASSERT(child_bits != 0);
1495                                 rc = mdt_object_lock(info, child, lhc,
1496                                                 child_bits, MDT_CROSS_LOCK);
1497                         } else {
1498                                 ma_need |= MA_LOV;
1499                         }
1500                 } else {
1501                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1502                          * client will enqueue the lock to the remote MDT */
1503                         if (mdt_object_remote(child))
1504                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1505                         rc = mdt_object_lock(info, child, lhc, child_bits,
1506                                                 MDT_CROSS_LOCK);
1507                 }
1508                 if (unlikely(rc != 0))
1509                         GOTO(out_child, rc);
1510         }
1511
1512         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1513
1514         /* finally, we can get attr for child. */
1515         rc = mdt_getattr_internal(info, child, ma_need);
1516         if (unlikely(rc != 0)) {
1517                 mdt_object_unlock(info, child, lhc, 1);
1518         } else if (lock) {
1519                 /* Debugging code. */
1520                 LDLM_DEBUG(lock, "Returning lock to client");
1521                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1522                                          &lock->l_resource->lr_name),
1523                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1524                          PLDLMRES(lock->l_resource),
1525                          PFID(mdt_object_fid(child)));
1526         }
1527         if (lock)
1528                 LDLM_LOCK_PUT(lock);
1529
1530         EXIT;
1531 out_child:
1532         mdt_object_put(info->mti_env, child);
1533 out_parent:
1534         if (lhp)
1535                 mdt_object_unlock(info, parent, lhp, 1);
1536         return rc;
1537 }
1538
1539 /* normal handler: should release the child lock */
1540 static int mdt_getattr_name(struct tgt_session_info *tsi)
1541 {
1542         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1543         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1544         struct mdt_body        *reqbody;
1545         struct mdt_body        *repbody;
1546         int rc, rc2;
1547         ENTRY;
1548
1549         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1550         LASSERT(reqbody != NULL);
1551         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1552         LASSERT(repbody != NULL);
1553
1554         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1555         repbody->mbo_eadatasize = 0;
1556         repbody->mbo_aclsize = 0;
1557
1558         rc = mdt_init_ucred(info, reqbody);
1559         if (unlikely(rc))
1560                 GOTO(out_shrink, rc);
1561
1562         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1563         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1564                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1565                 lhc->mlh_reg_lh.cookie = 0;
1566         }
1567         mdt_exit_ucred(info);
1568         EXIT;
1569 out_shrink:
1570         mdt_client_compatibility(info);
1571         rc2 = mdt_fix_reply(info);
1572         if (rc == 0)
1573                 rc = rc2;
1574         mdt_thread_info_fini(info);
1575         return rc;
1576 }
1577
1578 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1579                          void *karg, void *uarg);
1580
1581 static int mdt_set_info(struct tgt_session_info *tsi)
1582 {
1583         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1584         char                    *key;
1585         void                    *val;
1586         int                      keylen, vallen, rc = 0;
1587
1588         ENTRY;
1589
1590         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1591         if (key == NULL) {
1592                 DEBUG_REQ(D_HA, req, "no set_info key");
1593                 RETURN(err_serious(-EFAULT));
1594         }
1595
1596         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1597                                       RCL_CLIENT);
1598
1599         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1600         if (val == NULL) {
1601                 DEBUG_REQ(D_HA, req, "no set_info val");
1602                 RETURN(err_serious(-EFAULT));
1603         }
1604
1605         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1606                                       RCL_CLIENT);
1607
1608         /* Swab any part of val you need to here */
1609         if (KEY_IS(KEY_READ_ONLY)) {
1610                 spin_lock(&req->rq_export->exp_lock);
1611                 if (*(__u32 *)val)
1612                         *exp_connect_flags_ptr(req->rq_export) |=
1613                                 OBD_CONNECT_RDONLY;
1614                 else
1615                         *exp_connect_flags_ptr(req->rq_export) &=
1616                                 ~OBD_CONNECT_RDONLY;
1617                 spin_unlock(&req->rq_export->exp_lock);
1618         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1619                 struct changelog_setinfo *cs = val;
1620
1621                 if (vallen != sizeof(*cs)) {
1622                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1623                                tgt_name(tsi->tsi_tgt), vallen);
1624                         RETURN(-EINVAL);
1625                 }
1626                 if (ptlrpc_req_need_swab(req)) {
1627                         __swab64s(&cs->cs_recno);
1628                         __swab32s(&cs->cs_id);
1629                 }
1630
1631                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1632                                    vallen, val, NULL);
1633         } else {
1634                 RETURN(-EINVAL);
1635         }
1636         RETURN(rc);
1637 }
1638
1639 static int mdt_readpage(struct tgt_session_info *tsi)
1640 {
1641         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1642         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1643         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1644         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1645         struct mdt_body         *repbody;
1646         int                      rc;
1647         int                      i;
1648
1649         ENTRY;
1650
1651         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1652                 RETURN(err_serious(-ENOMEM));
1653
1654         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1655         if (repbody == NULL || reqbody == NULL)
1656                 RETURN(err_serious(-EFAULT));
1657
1658         /*
1659          * prepare @rdpg before calling lower layers and transfer itself. Here
1660          * reqbody->size contains offset of where to start to read and
1661          * reqbody->nlink contains number bytes to read.
1662          */
1663         rdpg->rp_hash = reqbody->mbo_size;
1664         if (rdpg->rp_hash != reqbody->mbo_size) {
1665                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1666                        rdpg->rp_hash, reqbody->mbo_size);
1667                 RETURN(-EFAULT);
1668         }
1669
1670         rdpg->rp_attrs = reqbody->mbo_mode;
1671         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1672                 rdpg->rp_attrs |= LUDA_64BITHASH;
1673         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1674                                 exp_max_brw_size(tsi->tsi_exp));
1675         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1676                           PAGE_CACHE_SHIFT;
1677         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1678         if (rdpg->rp_pages == NULL)
1679                 RETURN(-ENOMEM);
1680
1681         for (i = 0; i < rdpg->rp_npages; ++i) {
1682                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1683                 if (rdpg->rp_pages[i] == NULL)
1684                         GOTO(free_rdpg, rc = -ENOMEM);
1685         }
1686
1687         /* call lower layers to fill allocated pages with directory data */
1688         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1689         if (rc < 0)
1690                 GOTO(free_rdpg, rc);
1691
1692         /* send pages to client */
1693         rc = tgt_sendpage(tsi, rdpg, rc);
1694
1695         EXIT;
1696 free_rdpg:
1697
1698         for (i = 0; i < rdpg->rp_npages; i++)
1699                 if (rdpg->rp_pages[i] != NULL)
1700                         __free_page(rdpg->rp_pages[i]);
1701         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1702
1703         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1704                 RETURN(0);
1705
1706         return rc;
1707 }
1708
1709 static int mdt_reint_internal(struct mdt_thread_info *info,
1710                               struct mdt_lock_handle *lhc,
1711                               __u32 op)
1712 {
1713         struct req_capsule      *pill = info->mti_pill;
1714         struct mdt_body         *repbody;
1715         int                      rc = 0, rc2;
1716
1717         ENTRY;
1718
1719         rc = mdt_reint_unpack(info, op);
1720         if (rc != 0) {
1721                 CERROR("Can't unpack reint, rc %d\n", rc);
1722                 RETURN(err_serious(rc));
1723         }
1724
1725         /* for replay (no_create) lmm is not needed, client has it already */
1726         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1727                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1728                                      DEF_REP_MD_SIZE);
1729
1730         /* llog cookies are always 0, the field is kept for compatibility */
1731         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1732                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1733
1734         rc = req_capsule_server_pack(pill);
1735         if (rc != 0) {
1736                 CERROR("Can't pack response, rc %d\n", rc);
1737                 RETURN(err_serious(rc));
1738         }
1739
1740         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1741                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1742                 LASSERT(repbody);
1743                 repbody->mbo_eadatasize = 0;
1744                 repbody->mbo_aclsize = 0;
1745         }
1746
1747         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1748
1749         /* for replay no cookkie / lmm need, because client have this already */
1750         if (info->mti_spec.no_create)
1751                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1752                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1753
1754         rc = mdt_init_ucred_reint(info);
1755         if (rc)
1756                 GOTO(out_shrink, rc);
1757
1758         rc = mdt_fix_attr_ucred(info, op);
1759         if (rc != 0)
1760                 GOTO(out_ucred, rc = err_serious(rc));
1761
1762         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1763                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1764                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1765                 GOTO(out_ucred, rc);
1766         }
1767         rc = mdt_reint_rec(info, lhc);
1768         EXIT;
1769 out_ucred:
1770         mdt_exit_ucred(info);
1771 out_shrink:
1772         mdt_client_compatibility(info);
1773         rc2 = mdt_fix_reply(info);
1774         if (rc == 0)
1775                 rc = rc2;
1776         return rc;
1777 }
1778
1779 static long mdt_reint_opcode(struct ptlrpc_request *req,
1780                              const struct req_format **fmt)
1781 {
1782         struct mdt_device       *mdt;
1783         struct mdt_rec_reint    *rec;
1784         long                     opc;
1785
1786         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1787         if (rec != NULL) {
1788                 opc = rec->rr_opcode;
1789                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1790                 if (opc < REINT_MAX && fmt[opc] != NULL)
1791                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1792                 else {
1793                         mdt = mdt_exp2dev(req->rq_export);
1794                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1795                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1796                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1797                         opc = err_serious(-EFAULT);
1798                 }
1799         } else {
1800                 opc = err_serious(-EFAULT);
1801         }
1802         return opc;
1803 }
1804
1805 static int mdt_reint(struct tgt_session_info *tsi)
1806 {
1807         long opc;
1808         int  rc;
1809         static const struct req_format *reint_fmts[REINT_MAX] = {
1810                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1811                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1812                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1813                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1814                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1815                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1816                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1817                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1818                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1819         };
1820
1821         ENTRY;
1822
1823         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1824         if (opc >= 0) {
1825                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1826                 /*
1827                  * No lock possible here from client to pass it to reint code
1828                  * path.
1829                  */
1830                 rc = mdt_reint_internal(info, NULL, opc);
1831                 mdt_thread_info_fini(info);
1832         } else {
1833                 rc = opc;
1834         }
1835
1836         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1837         RETURN(rc);
1838 }
1839
1840 /* this should sync the whole device */
1841 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1842 {
1843         struct dt_device *dt = mdt->mdt_bottom;
1844         int rc;
1845         ENTRY;
1846
1847         rc = dt->dd_ops->dt_sync(env, dt);
1848         RETURN(rc);
1849 }
1850
1851 /* this should sync this object */
1852 static int mdt_object_sync(struct mdt_thread_info *info)
1853 {
1854         struct md_object *next;
1855         int rc;
1856         ENTRY;
1857
1858         if (!mdt_object_exists(info->mti_object)) {
1859                 CWARN("%s: non existing object "DFID": rc = %d\n",
1860                       mdt_obd_name(info->mti_mdt),
1861                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
1862                 RETURN(-ESTALE);
1863         }
1864         next = mdt_object_child(info->mti_object);
1865         rc = mo_object_sync(info->mti_env, next);
1866
1867         RETURN(rc);
1868 }
1869
1870 static int mdt_sync(struct tgt_session_info *tsi)
1871 {
1872         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1873         struct req_capsule      *pill = tsi->tsi_pill;
1874         struct mdt_body         *body;
1875         int                      rc;
1876
1877         ENTRY;
1878
1879         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1880                 RETURN(err_serious(-ENOMEM));
1881
1882         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
1883                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1884         } else {
1885                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1886
1887                 /* sync an object */
1888                 rc = mdt_object_sync(info);
1889                 if (rc == 0) {
1890                         const struct lu_fid *fid;
1891                         struct lu_attr *la = &info->mti_attr.ma_attr;
1892
1893                         info->mti_attr.ma_need = MA_INODE;
1894                         info->mti_attr.ma_valid = 0;
1895                         rc = mdt_attr_get_complex(info, info->mti_object,
1896                                                   &info->mti_attr);
1897                         if (rc == 0) {
1898                                 body = req_capsule_server_get(pill,
1899                                                               &RMF_MDT_BODY);
1900                                 fid = mdt_object_fid(info->mti_object);
1901                                 mdt_pack_attr2body(info, body, la, fid);
1902                         }
1903                 }
1904                 mdt_thread_info_fini(info);
1905         }
1906         if (rc == 0)
1907                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1908
1909         RETURN(rc);
1910 }
1911
1912 /*
1913  * Handle quota control requests to consult current usage/limit, but also
1914  * to configure quota enforcement
1915  */
1916 static int mdt_quotactl(struct tgt_session_info *tsi)
1917 {
1918         struct obd_export       *exp  = tsi->tsi_exp;
1919         struct req_capsule      *pill = tsi->tsi_pill;
1920         struct obd_quotactl     *oqctl, *repoqc;
1921         int                      id, rc;
1922         struct mdt_device       *mdt = mdt_exp2dev(exp);
1923         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1924         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
1925         ENTRY;
1926
1927         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1928         if (oqctl == NULL)
1929                 RETURN(err_serious(-EPROTO));
1930
1931         rc = req_capsule_server_pack(pill);
1932         if (rc)
1933                 RETURN(err_serious(rc));
1934
1935         switch (oqctl->qc_cmd) {
1936         case Q_QUOTACHECK:
1937         case LUSTRE_Q_INVALIDATE:
1938         case LUSTRE_Q_FINVALIDATE:
1939         case Q_QUOTAON:
1940         case Q_QUOTAOFF:
1941         case Q_INITQUOTA:
1942                 /* deprecated, not used any more */
1943                 RETURN(-EOPNOTSUPP);
1944                 /* master quotactl */
1945         case Q_SETINFO:
1946         case Q_SETQUOTA:
1947                 if (!nodemap_can_setquota(nodemap))
1948                         RETURN(-EPERM);
1949         case Q_GETINFO:
1950         case Q_GETQUOTA:
1951                 if (qmt == NULL)
1952                         RETURN(-EOPNOTSUPP);
1953                 /* slave quotactl */
1954         case Q_GETOINFO:
1955         case Q_GETOQUOTA:
1956                 break;
1957         default:
1958                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1959                 RETURN(-EFAULT);
1960         }
1961
1962         /* map uid/gid for remote client */
1963         id = oqctl->qc_id;
1964         if (exp_connect_rmtclient(exp)) {
1965                 struct lustre_idmap_table *idmap;
1966
1967                 idmap = exp->exp_mdt_data.med_idmap;
1968
1969                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
1970                              oqctl->qc_cmd != Q_GETINFO))
1971                         RETURN(-EPERM);
1972
1973                 if (oqctl->qc_type == USRQUOTA)
1974                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
1975                                                      oqctl->qc_id);
1976                 else if (oqctl->qc_type == GRPQUOTA)
1977                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
1978                                                      oqctl->qc_id);
1979                 else
1980                         RETURN(-EINVAL);
1981
1982                 if (id == CFS_IDMAP_NOTFOUND) {
1983                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
1984                         RETURN(-EACCES);
1985                 }
1986         }
1987
1988         if (oqctl->qc_type == USRQUOTA)
1989                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1990                                     NODEMAP_CLIENT_TO_FS, id);
1991         else if (oqctl->qc_type == GRPQUOTA)
1992                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1993                                     NODEMAP_CLIENT_TO_FS, id);
1994
1995         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
1996         if (repoqc == NULL)
1997                 RETURN(err_serious(-EFAULT));
1998
1999         if (oqctl->qc_id != id)
2000                 swap(oqctl->qc_id, id);
2001
2002         switch (oqctl->qc_cmd) {
2003
2004         case Q_GETINFO:
2005         case Q_SETINFO:
2006         case Q_SETQUOTA:
2007         case Q_GETQUOTA:
2008                 /* forward quotactl request to QMT */
2009                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2010                 break;
2011
2012         case Q_GETOINFO:
2013         case Q_GETOQUOTA:
2014                 /* slave quotactl */
2015                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2016                                    oqctl);
2017                 break;
2018
2019         default:
2020                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2021                 RETURN(-EFAULT);
2022         }
2023
2024         if (oqctl->qc_id != id)
2025                 swap(oqctl->qc_id, id);
2026
2027         *repoqc = *oqctl;
2028         RETURN(rc);
2029 }
2030
2031 /** clone llog ctxt from child (mdd)
2032  * This allows remote llog (replicator) access.
2033  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2034  * context was originally set up, or we can handle them directly.
2035  * I choose the latter, but that means I need any llog
2036  * contexts set up by child to be accessable by the mdt.  So we clone the
2037  * context into our context list here.
2038  */
2039 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2040                                int idx)
2041 {
2042         struct md_device  *next = mdt->mdt_child;
2043         struct llog_ctxt *ctxt;
2044         int rc;
2045
2046         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2047                 return 0;
2048
2049         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2050         if (rc || ctxt == NULL) {
2051                 return 0;
2052         }
2053
2054         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2055         if (rc)
2056                 CERROR("Can't set mdt ctxt %d\n", rc);
2057
2058         return rc;
2059 }
2060
2061 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2062                                  struct mdt_device *mdt, int idx)
2063 {
2064         struct llog_ctxt *ctxt;
2065
2066         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2067         if (ctxt == NULL)
2068                 return 0;
2069         /* Put once for the get we just did, and once for the clone */
2070         llog_ctxt_put(ctxt);
2071         llog_ctxt_put(ctxt);
2072         return 0;
2073 }
2074
2075 /*
2076  * sec context handlers
2077  */
2078 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2079 {
2080         int rc;
2081
2082         rc = mdt_handle_idmap(tsi);
2083         if (unlikely(rc)) {
2084                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2085                 __u32                    opc;
2086
2087                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2088                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2089                         sptlrpc_svc_ctx_invalidate(req);
2090         }
2091
2092         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2093
2094         return rc;
2095 }
2096
2097 /*
2098  * quota request handlers
2099  */
2100 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2101 {
2102         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2103         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2104         int                      rc;
2105         ENTRY;
2106
2107         if (qmt == NULL)
2108                 RETURN(err_serious(-EOPNOTSUPP));
2109
2110         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2111         RETURN(rc);
2112 }
2113
2114 struct mdt_object *mdt_object_new(const struct lu_env *env,
2115                                   struct mdt_device *d,
2116                                   const struct lu_fid *f)
2117 {
2118         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2119         struct lu_object *o;
2120         struct mdt_object *m;
2121         ENTRY;
2122
2123         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2124         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2125         if (unlikely(IS_ERR(o)))
2126                 m = (struct mdt_object *)o;
2127         else
2128                 m = mdt_obj(o);
2129         RETURN(m);
2130 }
2131
2132 struct mdt_object *mdt_object_find(const struct lu_env *env,
2133                                    struct mdt_device *d,
2134                                    const struct lu_fid *f)
2135 {
2136         struct lu_object *o;
2137         struct mdt_object *m;
2138         ENTRY;
2139
2140         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2141         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2142         if (unlikely(IS_ERR(o)))
2143                 m = (struct mdt_object *)o;
2144         else
2145                 m = mdt_obj(o);
2146
2147         RETURN(m);
2148 }
2149
2150 /**
2151  * Asyncronous commit for mdt device.
2152  *
2153  * Pass asynchonous commit call down the MDS stack.
2154  *
2155  * \param env environment
2156  * \param mdt the mdt device
2157  */
2158 static void mdt_device_commit_async(const struct lu_env *env,
2159                                     struct mdt_device *mdt)
2160 {
2161         struct dt_device *dt = mdt->mdt_bottom;
2162         int rc;
2163
2164         rc = dt->dd_ops->dt_commit_async(env, dt);
2165         if (unlikely(rc != 0))
2166                 CWARN("%s: async commit start failed: rc = %d\n",
2167                       mdt_obd_name(mdt), rc);
2168 }
2169
2170 /**
2171  * Mark the lock as "synchonous".
2172  *
2173  * Mark the lock to deffer transaction commit to the unlock time.
2174  *
2175  * \param lock the lock to mark as "synchonous"
2176  *
2177  * \see mdt_is_lock_sync
2178  * \see mdt_save_lock
2179  */
2180 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2181 {
2182         lock->l_ast_data = (void*)1;
2183 }
2184
2185 /**
2186  * Check whehter the lock "synchonous" or not.
2187  *
2188  * \param lock the lock to check
2189  * \retval 1 the lock is "synchonous"
2190  * \retval 0 the lock isn't "synchronous"
2191  *
2192  * \see mdt_set_lock_sync
2193  * \see mdt_save_lock
2194  */
2195 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2196 {
2197         return lock->l_ast_data != NULL;
2198 }
2199
2200 /**
2201  * Blocking AST for mdt locks.
2202  *
2203  * Starts transaction commit if in case of COS lock conflict or
2204  * deffers such a commit to the mdt_save_lock.
2205  *
2206  * \param lock the lock which blocks a request or cancelling lock
2207  * \param desc unused
2208  * \param data unused
2209  * \param flag indicates whether this cancelling or blocking callback
2210  * \retval 0
2211  * \see ldlm_blocking_ast_nocheck
2212  */
2213 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2214                      void *data, int flag)
2215 {
2216         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2217         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2218         int rc;
2219         ENTRY;
2220
2221         if (flag == LDLM_CB_CANCELING)
2222                 RETURN(0);
2223         lock_res_and_lock(lock);
2224         if (lock->l_blocking_ast != mdt_blocking_ast) {
2225                 unlock_res_and_lock(lock);
2226                 RETURN(0);
2227         }
2228         if (mdt_cos_is_enabled(mdt) &&
2229             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2230             lock->l_blocking_lock != NULL &&
2231             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2232                 mdt_set_lock_sync(lock);
2233         }
2234         rc = ldlm_blocking_ast_nocheck(lock);
2235
2236         /* There is no lock conflict if l_blocking_lock == NULL,
2237          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2238          * when the last reference to a local lock was released */
2239         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2240                 struct lu_env env;
2241
2242                 rc = lu_env_init(&env, LCT_LOCAL);
2243                 if (unlikely(rc != 0))
2244                         CWARN("%s: lu_env initialization failed, cannot "
2245                               "start asynchronous commit: rc = %d\n",
2246                               obd->obd_name, rc);
2247                 else
2248                         mdt_device_commit_async(&env, mdt);
2249                 lu_env_fini(&env);
2250         }
2251         RETURN(rc);
2252 }
2253
2254 /* Used for cross-MDT lock */
2255 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2256                             void *data, int flag)
2257 {
2258         struct lustre_handle lockh;
2259         int               rc;
2260
2261         switch (flag) {
2262         case LDLM_CB_BLOCKING:
2263                 ldlm_lock2handle(lock, &lockh);
2264                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2265                 if (rc < 0) {
2266                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2267                         RETURN(rc);
2268                 }
2269                 break;
2270         case LDLM_CB_CANCELING:
2271                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2272                 break;
2273         default:
2274                 LBUG();
2275         }
2276         RETURN(0);
2277 }
2278
2279 int mdt_check_resent_lock(struct mdt_thread_info *info,
2280                           struct mdt_object *mo,
2281                           struct mdt_lock_handle *lhc)
2282 {
2283         /* the lock might already be gotten in ldlm_handle_enqueue() */
2284         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2285                 struct ptlrpc_request *req = mdt_info_req(info);
2286                 struct ldlm_lock      *lock;
2287
2288                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2289                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2290                 if (lock == NULL) {
2291                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2292                          * a resend case, however, it could be already destroyed
2293                          * due to client eviction or a raced cancel RPC. */
2294                         LDLM_DEBUG_NOLOCK("Invalid lock handle "LPX64"\n",
2295                                           lhc->mlh_reg_lh.cookie);
2296                         RETURN(-ESTALE);
2297                 }
2298
2299                 if (!fid_res_name_eq(mdt_object_fid(mo),
2300                                      &lock->l_resource->lr_name)) {
2301                         CWARN("%s: Although resent, but still not "
2302                               "get child lock:"DFID"\n",
2303                               info->mti_exp->exp_obd->obd_name,
2304                               PFID(mdt_object_fid(mo)));
2305                         LDLM_LOCK_PUT(lock);
2306                         RETURN(-EPROTO);
2307                 }
2308                 LDLM_LOCK_PUT(lock);
2309                 return 0;
2310         }
2311         return 1;
2312 }
2313
2314 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2315                            struct mdt_object *o, const struct lu_fid *fid,
2316                            struct lustre_handle *lh, ldlm_mode_t mode,
2317                            __u64 ibits)
2318 {
2319         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2320         ldlm_policy_data_t *policy = &mti->mti_policy;
2321         struct ldlm_res_id *res_id = &mti->mti_res_id;
2322         int rc = 0;
2323         ENTRY;
2324
2325         LASSERT(mdt_object_remote(o));
2326
2327         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2328
2329         fid_build_reg_res_name(fid, res_id);
2330
2331         memset(einfo, 0, sizeof(*einfo));
2332         einfo->ei_type = LDLM_IBITS;
2333         einfo->ei_mode = mode;
2334         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2335         einfo->ei_cb_cp = ldlm_completion_ast;
2336         einfo->ei_enq_slave = 0;
2337         einfo->ei_res_id = res_id;
2338
2339         memset(policy, 0, sizeof(*policy));
2340         policy->l_inodebits.bits = ibits;
2341
2342         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2343                             policy);
2344         RETURN(rc);
2345 }
2346
2347 static int mdt_object_local_lock(struct mdt_thread_info *info,
2348                                  struct mdt_object *o,
2349                                  struct mdt_lock_handle *lh, __u64 ibits,
2350                                  bool nonblock, int locality)
2351 {
2352         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2353         ldlm_policy_data_t *policy = &info->mti_policy;
2354         struct ldlm_res_id *res_id = &info->mti_res_id;
2355         __u64 dlmflags;
2356         int rc;
2357         ENTRY;
2358
2359         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2360         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2361         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2362         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2363
2364         /* Only enqueue LOOKUP lock for remote object */
2365         if (mdt_object_remote(o))
2366                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2367
2368         if (lh->mlh_type == MDT_PDO_LOCK) {
2369                 /* check for exists after object is locked */
2370                 if (mdt_object_exists(o) == 0) {
2371                         /* Non-existent object shouldn't have PDO lock */
2372                         RETURN(-ESTALE);
2373                 } else {
2374                         /* Non-dir object shouldn't have PDO lock */
2375                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2376                                 RETURN(-ENOTDIR);
2377                 }
2378         }
2379
2380         memset(policy, 0, sizeof(*policy));
2381         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2382
2383         dlmflags = LDLM_FL_ATOMIC_CB;
2384         if (nonblock)
2385                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2386
2387         /*
2388          * Take PDO lock on whole directory and build correct @res_id for lock
2389          * on part of directory.
2390          */
2391         if (lh->mlh_pdo_hash != 0) {
2392                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2393                 mdt_lock_pdo_mode(info, o, lh);
2394                 if (lh->mlh_pdo_mode != LCK_NL) {
2395                         /*
2396                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2397                          * is never going to be sent to client and we do not
2398                          * want it slowed down due to possible cancels.
2399                          */
2400                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2401                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2402                                           policy, res_id, dlmflags,
2403                                           info->mti_exp == NULL ? NULL :
2404                                           &info->mti_exp->exp_handle.h_cookie);
2405                         if (unlikely(rc != 0))
2406                                 GOTO(out_unlock, rc);
2407                 }
2408
2409                 /*
2410                  * Finish res_id initializing by name hash marking part of
2411                  * directory which is taking modification.
2412                  */
2413                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2414         }
2415
2416         policy->l_inodebits.bits = ibits;
2417
2418         /*
2419          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2420          * going to be sent to client. If it is - mdt_intent_policy() path will
2421          * fix it up and turn FL_LOCAL flag off.
2422          */
2423         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2424                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2425                           info->mti_exp == NULL ? NULL :
2426                           &info->mti_exp->exp_handle.h_cookie);
2427 out_unlock:
2428         if (rc != 0)
2429                 mdt_object_unlock(info, o, lh, 1);
2430         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2431                    lh->mlh_pdo_hash != 0 &&
2432                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2433                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2434
2435         RETURN(rc);
2436 }
2437
2438 static int
2439 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2440                          struct mdt_lock_handle *lh, __u64 ibits,
2441                          bool nonblock, int locality)
2442 {
2443         int rc;
2444         ENTRY;
2445
2446         if (!mdt_object_remote(o))
2447                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2448                                              locality);
2449
2450         if (locality == MDT_LOCAL_LOCK) {
2451                 CERROR("%s: try to get local lock for remote object"
2452                        DFID".\n", mdt_obd_name(info->mti_mdt),
2453                        PFID(mdt_object_fid(o)));
2454                 RETURN(-EPROTO);
2455         }
2456
2457         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2458         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2459                    MDS_INODELOCK_XATTR);
2460         if (ibits & MDS_INODELOCK_UPDATE) {
2461                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2462                  * enqueue RPC can only request 1 lock, to avoid extra
2463                  * RPC, so it will instead enqueue EX lock for remote
2464                  * object anyway XXX*/
2465                 if (lh->mlh_type == MDT_PDO_LOCK &&
2466                     lh->mlh_pdo_hash != 0) {
2467                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2468                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2469                                PFID(mdt_object_fid(o)));
2470                         lh->mlh_pdo_hash = 0;
2471                         lh->mlh_rreg_mode = LCK_EX;
2472                         lh->mlh_type = MDT_REG_LOCK;
2473                 }
2474                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2475                                             &lh->mlh_rreg_lh,
2476                                             lh->mlh_rreg_mode,
2477                                             MDS_INODELOCK_UPDATE);
2478                 if (rc != ELDLM_OK)
2479                         RETURN(rc);
2480         }
2481
2482         /* Only enqueue LOOKUP lock for remote object */
2483         if (ibits & MDS_INODELOCK_LOOKUP) {
2484                 rc = mdt_object_local_lock(info, o, lh,
2485                                            MDS_INODELOCK_LOOKUP,
2486                                            nonblock, locality);
2487                 if (rc != ELDLM_OK)
2488                         RETURN(rc);
2489         }
2490
2491         RETURN(0);
2492 }
2493
2494 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2495                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2496 {
2497         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2498 }
2499
2500 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2501                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2502 {
2503         struct mdt_lock_handle tmp = *lh;
2504         int rc;
2505
2506         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2507         if (rc == 0)
2508                 *lh = tmp;
2509
2510         return rc == 0;
2511 }
2512
2513 /**
2514  * Save a lock within request object.
2515  *
2516  * Keep the lock referenced until whether client ACK or transaction
2517  * commit happens or release the lock immediately depending on input
2518  * parameters. If COS is ON, a write lock is converted to COS lock
2519  * before saving.
2520  *
2521  * \param info thead info object
2522  * \param h lock handle
2523  * \param mode lock mode
2524  * \param decref force immediate lock releasing
2525  */
2526 static
2527 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2528                    ldlm_mode_t mode, int decref)
2529 {
2530         ENTRY;
2531
2532         if (lustre_handle_is_used(h)) {
2533                 if (decref || !info->mti_has_trans ||
2534                     !(mode & (LCK_PW | LCK_EX))){
2535                         mdt_fid_unlock(h, mode);
2536                 } else {
2537                         struct mdt_device *mdt = info->mti_mdt;
2538                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2539                         struct ptlrpc_request *req = mdt_info_req(info);
2540                         int no_ack = 0;
2541
2542                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2543                                  h->cookie);
2544                         /* there is no request if mdt_object_unlock() is called
2545                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2546                         if (likely(req != NULL)) {
2547                                 CDEBUG(D_HA, "request = %p reply state = %p"
2548                                        " transno = "LPD64"\n", req,
2549                                        req->rq_reply_state, req->rq_transno);
2550                                 if (mdt_cos_is_enabled(mdt)) {
2551                                         no_ack = 1;
2552                                         ldlm_lock_downgrade(lock, LCK_COS);
2553                                         mode = LCK_COS;
2554                                 }
2555                                 ptlrpc_save_lock(req, h, mode, no_ack);
2556                         } else {
2557                                 ldlm_lock_decref(h, mode);
2558                         }
2559                         if (mdt_is_lock_sync(lock)) {
2560                                 CDEBUG(D_HA, "found sync-lock,"
2561                                        " async commit started\n");
2562                                 mdt_device_commit_async(info->mti_env,
2563                                                         mdt);
2564                         }
2565                         LDLM_LOCK_PUT(lock);
2566                 }
2567                 h->cookie = 0ull;
2568         }
2569
2570         EXIT;
2571 }
2572
2573 /**
2574  * Unlock mdt object.
2575  *
2576  * Immeditely release the regular lock and the PDO lock or save the
2577  * lock in reqeuest and keep them referenced until client ACK or
2578  * transaction commit.
2579  *
2580  * \param info thread info object
2581  * \param o mdt object
2582  * \param lh mdt lock handle referencing regular and PDO locks
2583  * \param decref force immediate lock releasing
2584  */
2585 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2586                        struct mdt_lock_handle *lh, int decref)
2587 {
2588         ENTRY;
2589
2590         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2591         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2592
2593         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2594                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2595
2596         EXIT;
2597 }
2598
2599 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2600                                         const struct lu_fid *f,
2601                                         struct mdt_lock_handle *lh,
2602                                         __u64 ibits)
2603 {
2604         struct mdt_object *o;
2605
2606         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2607         if (!IS_ERR(o)) {
2608                 int rc;
2609
2610                 rc = mdt_object_lock(info, o, lh, ibits,
2611                                      MDT_LOCAL_LOCK);
2612                 if (rc != 0) {
2613                         mdt_object_put(info->mti_env, o);
2614                         o = ERR_PTR(rc);
2615                 }
2616         }
2617         return o;
2618 }
2619
2620 void mdt_object_unlock_put(struct mdt_thread_info * info,
2621                            struct mdt_object * o,
2622                            struct mdt_lock_handle *lh,
2623                            int decref)
2624 {
2625         mdt_object_unlock(info, o, lh, decref);
2626         mdt_object_put(info->mti_env, o);
2627 }
2628
2629 /*
2630  * Generic code handling requests that have struct mdt_body passed in:
2631  *
2632  *  - extract mdt_body from request and save it in @info, if present;
2633  *
2634  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2635  *  @info;
2636  *
2637  *  - if HABEO_CORPUS flag is set for this request type check whether object
2638  *  actually exists on storage (lu_object_exists()).
2639  *
2640  */
2641 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2642 {
2643         const struct mdt_body    *body;
2644         struct mdt_object        *obj;
2645         const struct lu_env      *env;
2646         struct req_capsule       *pill;
2647         int                       rc;
2648         ENTRY;
2649
2650         env = info->mti_env;
2651         pill = info->mti_pill;
2652
2653         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2654         if (body == NULL)
2655                 RETURN(-EFAULT);
2656
2657         if (!(body->mbo_valid & OBD_MD_FLID))
2658                 RETURN(0);
2659
2660         if (!fid_is_sane(&body->mbo_fid1)) {
2661                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2662                 RETURN(-EINVAL);
2663         }
2664
2665         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
2666         if (!IS_ERR(obj)) {
2667                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
2668                         mdt_object_put(env, obj);
2669                         rc = -ENOENT;
2670                 } else {
2671                         info->mti_object = obj;
2672                         rc = 0;
2673                 }
2674         } else
2675                 rc = PTR_ERR(obj);
2676
2677         RETURN(rc);
2678 }
2679
2680 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2681 {
2682         struct req_capsule *pill = info->mti_pill;
2683         int rc;
2684         ENTRY;
2685
2686         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2687                 rc = mdt_body_unpack(info, flags);
2688         else
2689                 rc = 0;
2690
2691         if (rc == 0 && (flags & HABEO_REFERO)) {
2692                 /* Pack reply. */
2693                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2694                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2695                                              DEF_REP_MD_SIZE);
2696                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2697                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2698                                              RCL_SERVER, 0);
2699
2700                 rc = req_capsule_server_pack(pill);
2701         }
2702         RETURN(rc);
2703 }
2704
2705 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2706 {
2707         lh->mlh_type = MDT_NUL_LOCK;
2708         lh->mlh_reg_lh.cookie = 0ull;
2709         lh->mlh_reg_mode = LCK_MINMODE;
2710         lh->mlh_pdo_lh.cookie = 0ull;
2711         lh->mlh_pdo_mode = LCK_MINMODE;
2712         lh->mlh_rreg_lh.cookie = 0ull;
2713         lh->mlh_rreg_mode = LCK_MINMODE;
2714 }
2715
2716 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2717 {
2718         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2719         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2720 }
2721
2722 /*
2723  * Initialize fields of struct mdt_thread_info. Other fields are left in
2724  * uninitialized state, because it's too expensive to zero out whole
2725  * mdt_thread_info (> 1K) on each request arrival.
2726  */
2727 void mdt_thread_info_init(struct ptlrpc_request *req,
2728                           struct mdt_thread_info *info)
2729 {
2730         int i;
2731
2732         info->mti_pill = &req->rq_pill;
2733
2734         /* lock handle */
2735         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2736                 mdt_lock_handle_init(&info->mti_lh[i]);
2737
2738         /* mdt device: it can be NULL while CONNECT */
2739         if (req->rq_export) {
2740                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2741                 info->mti_exp = req->rq_export;
2742         } else
2743                 info->mti_mdt = NULL;
2744         info->mti_env = req->rq_svc_thread->t_env;
2745         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2746
2747         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2748         info->mti_big_buf = LU_BUF_NULL;
2749         info->mti_body = NULL;
2750         info->mti_object = NULL;
2751         info->mti_dlm_req = NULL;
2752         info->mti_has_trans = 0;
2753         info->mti_cross_ref = 0;
2754         info->mti_opdata = 0;
2755         info->mti_big_lmm_used = 0;
2756
2757         info->mti_spec.no_create = 0;
2758         info->mti_spec.sp_rm_entry = 0;
2759         info->mti_spec.sp_permitted = 0;
2760
2761         info->mti_spec.u.sp_ea.eadata = NULL;
2762         info->mti_spec.u.sp_ea.eadatalen = 0;
2763 }
2764
2765 void mdt_thread_info_fini(struct mdt_thread_info *info)
2766 {
2767         int i;
2768
2769         if (info->mti_object != NULL) {
2770                 mdt_object_put(info->mti_env, info->mti_object);
2771                 info->mti_object = NULL;
2772         }
2773
2774         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2775                 mdt_lock_handle_fini(&info->mti_lh[i]);
2776         info->mti_env = NULL;
2777         info->mti_pill = NULL;
2778         info->mti_exp = NULL;
2779
2780         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2781                 lu_buf_free(&info->mti_big_buf);
2782 }
2783
2784 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2785 {
2786         struct mdt_thread_info  *mti;
2787
2788         mti = mdt_th_info(tsi->tsi_env);
2789         LASSERT(mti != NULL);
2790
2791         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2792         if (tsi->tsi_corpus != NULL) {
2793                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2794                 lu_object_get(tsi->tsi_corpus);
2795         }
2796         mti->mti_body = tsi->tsi_mdt_body;
2797         mti->mti_dlm_req = tsi->tsi_dlm_req;
2798
2799         return mti;
2800 }
2801
2802 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2803 {
2804         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2805         int                      rc;
2806
2807         ENTRY;
2808
2809         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
2810             cfs_fail_val ==
2811             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id)
2812                 schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE,
2813                         msecs_to_jiffies(3 * MSEC_PER_SEC));
2814
2815         rc = tgt_connect(tsi);
2816         if (rc != 0)
2817                 RETURN(rc);
2818
2819         rc = mdt_init_idmap(tsi);
2820         if (rc != 0)
2821                 GOTO(err, rc);
2822         RETURN(0);
2823 err:
2824         obd_disconnect(class_export_get(req->rq_export));
2825         return rc;
2826 }
2827
2828 enum mdt_it_code {
2829         MDT_IT_OPEN,
2830         MDT_IT_OCREAT,
2831         MDT_IT_CREATE,
2832         MDT_IT_GETATTR,
2833         MDT_IT_READDIR,
2834         MDT_IT_LOOKUP,
2835         MDT_IT_UNLINK,
2836         MDT_IT_TRUNC,
2837         MDT_IT_GETXATTR,
2838         MDT_IT_LAYOUT,
2839         MDT_IT_QUOTA,
2840         MDT_IT_NR
2841 };
2842
2843 static int mdt_intent_getattr(enum mdt_it_code opcode,
2844                               struct mdt_thread_info *info,
2845                               struct ldlm_lock **,
2846                               __u64);
2847
2848 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2849                                 struct mdt_thread_info *info,
2850                                 struct ldlm_lock **lockp,
2851                                 __u64 flags);
2852
2853 static int mdt_intent_layout(enum mdt_it_code opcode,
2854                              struct mdt_thread_info *info,
2855                              struct ldlm_lock **,
2856                              __u64);
2857 static int mdt_intent_reint(enum mdt_it_code opcode,
2858                             struct mdt_thread_info *info,
2859                             struct ldlm_lock **,
2860                             __u64);
2861
2862 static struct mdt_it_flavor {
2863         const struct req_format *it_fmt;
2864         __u32                    it_flags;
2865         int                    (*it_act)(enum mdt_it_code ,
2866                                          struct mdt_thread_info *,
2867                                          struct ldlm_lock **,
2868                                          __u64);
2869         long                     it_reint;
2870 } mdt_it_flavor[] = {
2871         [MDT_IT_OPEN]     = {
2872                 .it_fmt   = &RQF_LDLM_INTENT,
2873                 /*.it_flags = HABEO_REFERO,*/
2874                 .it_flags = 0,
2875                 .it_act   = mdt_intent_reint,
2876                 .it_reint = REINT_OPEN
2877         },
2878         [MDT_IT_OCREAT]   = {
2879                 .it_fmt   = &RQF_LDLM_INTENT,
2880                 /*
2881                  * OCREAT is not a MUTABOR request as if the file
2882                  * already exists.
2883                  * We do the extra check of OBD_CONNECT_RDONLY in
2884                  * mdt_reint_open() when we really need to create
2885                  * the object.
2886                  */
2887                 .it_flags = 0,
2888                 .it_act   = mdt_intent_reint,
2889                 .it_reint = REINT_OPEN
2890         },
2891         [MDT_IT_CREATE]   = {
2892                 .it_fmt   = &RQF_LDLM_INTENT,
2893                 .it_flags = MUTABOR,
2894                 .it_act   = mdt_intent_reint,
2895                 .it_reint = REINT_CREATE
2896         },
2897         [MDT_IT_GETATTR]  = {
2898                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2899                 .it_flags = HABEO_REFERO,
2900                 .it_act   = mdt_intent_getattr
2901         },
2902         [MDT_IT_READDIR]  = {
2903                 .it_fmt   = NULL,
2904                 .it_flags = 0,
2905                 .it_act   = NULL
2906         },
2907         [MDT_IT_LOOKUP]   = {
2908                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2909                 .it_flags = HABEO_REFERO,
2910                 .it_act   = mdt_intent_getattr
2911         },
2912         [MDT_IT_UNLINK]   = {
2913                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2914                 .it_flags = MUTABOR,
2915                 .it_act   = NULL,
2916                 .it_reint = REINT_UNLINK
2917         },
2918         [MDT_IT_TRUNC]    = {
2919                 .it_fmt   = NULL,
2920                 .it_flags = MUTABOR,
2921                 .it_act   = NULL
2922         },
2923         [MDT_IT_GETXATTR] = {
2924                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2925                 .it_flags = HABEO_CORPUS,
2926                 .it_act   = mdt_intent_getxattr
2927         },
2928         [MDT_IT_LAYOUT] = {
2929                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2930                 .it_flags = 0,
2931                 .it_act   = mdt_intent_layout
2932         }
2933 };
2934
2935 static int
2936 mdt_intent_lock_replace(struct mdt_thread_info *info,
2937                         struct ldlm_lock **lockp,
2938                         struct mdt_lock_handle *lh,
2939                         __u64 flags)
2940 {
2941         struct ptlrpc_request  *req = mdt_info_req(info);
2942         struct ldlm_lock       *lock = *lockp;
2943         struct ldlm_lock       *new_lock;
2944
2945         /* If possible resent found a lock, @lh is set to its handle */
2946         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2947
2948         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2949                 lh->mlh_reg_lh.cookie = 0;
2950                 RETURN(0);
2951         }
2952
2953         LASSERTF(new_lock != NULL,
2954                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2955
2956         /*
2957          * If we've already given this lock to a client once, then we should
2958          * have no readers or writers.  Otherwise, we should have one reader
2959          * _or_ writer ref (which will be zeroed below) before returning the
2960          * lock to a client.
2961          */
2962         if (new_lock->l_export == req->rq_export) {
2963                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2964         } else {
2965                 LASSERT(new_lock->l_export == NULL);
2966                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2967         }
2968
2969         *lockp = new_lock;
2970
2971         if (new_lock->l_export == req->rq_export) {
2972                 /*
2973                  * Already gave this to the client, which means that we
2974                  * reconstructed a reply.
2975                  */
2976                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2977                         MSG_RESENT);
2978
2979                 LDLM_LOCK_RELEASE(new_lock);
2980                 lh->mlh_reg_lh.cookie = 0;
2981                 RETURN(ELDLM_LOCK_REPLACED);
2982         }
2983
2984         /*
2985          * Fixup the lock to be given to the client.
2986          */
2987         lock_res_and_lock(new_lock);
2988         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
2989          * possible blocking AST. */
2990         while (new_lock->l_readers > 0) {
2991                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
2992                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2993                 new_lock->l_readers--;
2994         }
2995         while (new_lock->l_writers > 0) {
2996                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
2997                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2998                 new_lock->l_writers--;
2999         }
3000
3001         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3002         new_lock->l_blocking_ast = lock->l_blocking_ast;
3003         new_lock->l_completion_ast = lock->l_completion_ast;
3004         new_lock->l_remote_handle = lock->l_remote_handle;
3005         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3006
3007         unlock_res_and_lock(new_lock);
3008
3009         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3010                      &new_lock->l_remote_handle,
3011                      &new_lock->l_exp_hash);
3012
3013         LDLM_LOCK_RELEASE(new_lock);
3014         lh->mlh_reg_lh.cookie = 0;
3015
3016         RETURN(ELDLM_LOCK_REPLACED);
3017 }
3018
3019 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3020                                     struct ldlm_lock *new_lock,
3021                                     struct mdt_lock_handle *lh,
3022                                     __u64 flags)
3023 {
3024         struct ptlrpc_request  *req = mdt_info_req(info);
3025         struct ldlm_request    *dlmreq;
3026
3027         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3028                 return;
3029
3030         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3031
3032         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3033          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3034          * initialized. */
3035         if (flags & LDLM_FL_RESENT) {
3036                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3037                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3038
3039                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3040                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie "LPX64,
3041                           lh->mlh_reg_lh.cookie);
3042                 return;
3043         }
3044
3045         /*
3046          * If the xid matches, then we know this is a resent request, and allow
3047          * it. (It's probably an OPEN, for which we don't send a lock.
3048          */
3049         if (req_xid_is_last(req))
3050                 return;
3051
3052         /*
3053          * This remote handle isn't enqueued, so we never received or processed
3054          * this request.  Clear MSG_RESENT, because it can be handled like any
3055          * normal request now.
3056          */
3057         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3058
3059         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3060                   dlmreq->lock_handle[0].cookie);
3061 }
3062
3063 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3064                                 struct mdt_thread_info *info,
3065                                 struct ldlm_lock **lockp,
3066                                 __u64 flags)
3067 {
3068         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3069         struct ldlm_reply      *ldlm_rep = NULL;
3070         int rc, grc;
3071
3072         /*
3073          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3074          * (for the resend case) or a new lock. Below we will use it to
3075          * replace the original lock.
3076          */
3077         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3078         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3079                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3080                 rc = mdt_object_lock(info, info->mti_object, lhc,
3081                                         MDS_INODELOCK_XATTR,
3082                                         MDT_LOCAL_LOCK);
3083                 if (rc)
3084                         return rc;
3085         }
3086
3087         grc = mdt_getxattr(info);
3088
3089         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3090
3091         if (mdt_info_req(info)->rq_repmsg != NULL)
3092                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3093         if (ldlm_rep == NULL)
3094                 RETURN(err_serious(-EFAULT));
3095
3096         ldlm_rep->lock_policy_res2 = grc;
3097
3098         return rc;
3099 }
3100
3101 static int mdt_intent_getattr(enum mdt_it_code opcode,
3102                               struct mdt_thread_info *info,
3103                               struct ldlm_lock **lockp,
3104                               __u64 flags)
3105 {
3106         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3107         __u64                   child_bits;
3108         struct ldlm_reply      *ldlm_rep;
3109         struct mdt_body        *reqbody;
3110         struct mdt_body        *repbody;
3111         int                     rc, rc2;
3112         ENTRY;
3113
3114         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3115         LASSERT(reqbody);
3116
3117         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3118         LASSERT(repbody);
3119
3120         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3121         repbody->mbo_eadatasize = 0;
3122         repbody->mbo_aclsize = 0;
3123
3124         switch (opcode) {
3125         case MDT_IT_LOOKUP:
3126                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3127                 break;
3128         case MDT_IT_GETATTR:
3129                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3130                              MDS_INODELOCK_PERM;
3131                 break;
3132         default:
3133                 CERROR("Unsupported intent (%d)\n", opcode);
3134                 GOTO(out_shrink, rc = -EINVAL);
3135         }
3136
3137         rc = mdt_init_ucred(info, reqbody);
3138         if (rc)
3139                 GOTO(out_shrink, rc);
3140
3141         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3142         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3143
3144         /* Get lock from request for possible resent case. */
3145         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3146
3147         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3148         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3149
3150         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3151                 ldlm_rep->lock_policy_res2 = 0;
3152         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3153             ldlm_rep->lock_policy_res2) {
3154                 lhc->mlh_reg_lh.cookie = 0ull;
3155                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3156         }
3157
3158         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3159         EXIT;
3160 out_ucred:
3161         mdt_exit_ucred(info);
3162 out_shrink:
3163         mdt_client_compatibility(info);
3164         rc2 = mdt_fix_reply(info);
3165         if (rc == 0)
3166                 rc = rc2;
3167         return rc;
3168 }
3169
3170 static int mdt_intent_layout(enum mdt_it_code opcode,
3171                              struct mdt_thread_info *info,
3172                              struct ldlm_lock **lockp,
3173                              __u64 flags)
3174 {
3175         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3176         struct layout_intent *layout;
3177         struct lu_fid *fid;
3178         struct mdt_object *obj = NULL;
3179         int rc = 0;
3180         ENTRY;
3181
3182         if (opcode != MDT_IT_LAYOUT) {
3183                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3184                         opcode);
3185                 RETURN(-EINVAL);
3186         }
3187
3188         fid = &info->mti_tmp_fid2;
3189         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3190
3191         /* Get lock from request for possible resent case. */
3192         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3193
3194         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3195         if (IS_ERR(obj))
3196                 RETURN(PTR_ERR(obj));
3197
3198         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3199                 /* get the length of lsm */
3200                 rc = mdt_attr_get_eabuf_size(info, obj);
3201                 if (rc < 0) {
3202                         mdt_object_put(info->mti_env, obj);
3203                         RETURN(rc);
3204                 }
3205
3206                 if (rc > info->mti_mdt->mdt_max_mdsize)
3207                         info->mti_mdt->mdt_max_mdsize = rc;
3208         }
3209
3210         mdt_object_put(info->mti_env, obj);
3211
3212         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3213         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER, rc);
3214         rc = req_capsule_server_pack(info->mti_pill);
3215         if (rc != 0)
3216                 RETURN(-EINVAL);
3217
3218         if (lustre_handle_is_used(&lhc->mlh_reg_lh))
3219                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3220
3221         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3222         LASSERT(layout != NULL);
3223         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3224                 /* return to normal/resent ldlm handling */
3225                 RETURN(rc);
3226
3227         CERROR("%s: Unsupported layout intent (%d)\n",
3228                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3229         RETURN(-EINVAL);
3230 }
3231
3232 static int mdt_intent_reint(enum mdt_it_code opcode,
3233                             struct mdt_thread_info *info,
3234                             struct ldlm_lock **lockp,
3235                             __u64 flags)
3236 {
3237         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3238         struct ldlm_reply      *rep = NULL;
3239         long                    opc;
3240         int                     rc;
3241
3242         static const struct req_format *intent_fmts[REINT_MAX] = {
3243                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3244                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3245         };
3246
3247         ENTRY;
3248
3249         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3250         if (opc < 0)
3251                 RETURN(opc);
3252
3253         if (mdt_it_flavor[opcode].it_reint != opc) {
3254                 CERROR("Reint code %ld doesn't match intent: %d\n",
3255                        opc, opcode);
3256                 RETURN(err_serious(-EPROTO));
3257         }
3258
3259         /* Get lock from request for possible resent case. */
3260         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3261
3262         rc = mdt_reint_internal(info, lhc, opc);
3263
3264         /* Check whether the reply has been packed successfully. */
3265         if (mdt_info_req(info)->rq_repmsg != NULL)
3266                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3267         if (rep == NULL)
3268                 RETURN(err_serious(-EFAULT));
3269
3270         /* MDC expects this in any case */
3271         if (rc != 0)
3272                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3273
3274         /* the open lock or the lock for cross-ref object should be
3275          * returned to the client */
3276         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3277             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3278                 rep->lock_policy_res2 = 0;
3279                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3280                 RETURN(rc);
3281         }
3282
3283         rep->lock_policy_res2 = clear_serious(rc);
3284
3285         if (rep->lock_policy_res2 == -ENOENT &&
3286             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3287                 rep->lock_policy_res2 = 0;
3288
3289         lhc->mlh_reg_lh.cookie = 0ull;
3290         if (rc == -ENOTCONN || rc == -ENODEV ||
3291             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3292                 /*
3293                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3294                  * will be returned by rq_status, and client at ptlrpc layer
3295                  * will detect this, then disconnect, reconnect the import
3296                  * immediately, instead of impacting the following the rpc.
3297                  */
3298                 RETURN(rc);
3299         }
3300         /*
3301          * For other cases, the error will be returned by intent, and client
3302          * will retrieve the result from intent.
3303          */
3304         RETURN(ELDLM_LOCK_ABORTED);
3305 }
3306
3307 static int mdt_intent_code(long itcode)
3308 {
3309         int rc;
3310
3311         switch(itcode) {
3312         case IT_OPEN:
3313                 rc = MDT_IT_OPEN;
3314                 break;
3315         case IT_OPEN|IT_CREAT:
3316                 rc = MDT_IT_OCREAT;
3317                 break;
3318         case IT_CREAT:
3319                 rc = MDT_IT_CREATE;
3320                 break;
3321         case IT_READDIR:
3322                 rc = MDT_IT_READDIR;
3323                 break;
3324         case IT_GETATTR:
3325                 rc = MDT_IT_GETATTR;
3326                 break;
3327         case IT_LOOKUP:
3328                 rc = MDT_IT_LOOKUP;
3329                 break;
3330         case IT_UNLINK:
3331                 rc = MDT_IT_UNLINK;
3332                 break;
3333         case IT_TRUNC:
3334                 rc = MDT_IT_TRUNC;
3335                 break;
3336         case IT_GETXATTR:
3337                 rc = MDT_IT_GETXATTR;
3338                 break;
3339         case IT_LAYOUT:
3340                 rc = MDT_IT_LAYOUT;
3341                 break;
3342         case IT_QUOTA_DQACQ:
3343         case IT_QUOTA_CONN:
3344                 rc = MDT_IT_QUOTA;
3345                 break;
3346         default:
3347                 CERROR("Unknown intent opcode: %ld\n", itcode);
3348                 rc = -EINVAL;
3349                 break;
3350         }
3351         return rc;
3352 }
3353
3354 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3355                           struct ldlm_lock **lockp, __u64 flags)
3356 {
3357         struct req_capsule      *pill = info->mti_pill;
3358         struct ptlrpc_request   *req = mdt_info_req(info);
3359         struct mdt_it_flavor    *flv;
3360         int opc;
3361         int rc;
3362         ENTRY;
3363
3364         opc = mdt_intent_code(itopc);
3365         if (opc < 0)
3366                 RETURN(-EINVAL);
3367
3368         if (opc == MDT_IT_QUOTA) {
3369                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3370
3371                 if (qmt == NULL)
3372                         RETURN(-EOPNOTSUPP);
3373
3374                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3375                 /* pass the request to quota master */
3376                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3377                                                  mdt_info_req(info), lockp,
3378                                                  flags);
3379                 RETURN(rc);
3380         }
3381
3382         flv = &mdt_it_flavor[opc];
3383         if (flv->it_fmt != NULL)
3384                 req_capsule_extend(pill, flv->it_fmt);
3385
3386         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3387         if (rc < 0)
3388                 RETURN(rc);
3389
3390         if (flv->it_flags & MUTABOR &&
3391             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3392                 RETURN(-EROFS);
3393
3394         if (flv->it_act != NULL) {
3395                 struct ldlm_reply *rep;
3396
3397                 /* execute policy */
3398                 rc = flv->it_act(opc, info, lockp, flags);
3399
3400                 /* Check whether the reply has been packed successfully. */
3401                 if (req->rq_repmsg != NULL) {
3402                         rep = req_capsule_server_get(info->mti_pill,
3403                                                      &RMF_DLM_REP);
3404                         rep->lock_policy_res2 =
3405                                 ptlrpc_status_hton(rep->lock_policy_res2);
3406                 }
3407         }
3408
3409         RETURN(rc);
3410 }
3411
3412 static int mdt_intent_policy(struct ldlm_namespace *ns,
3413                              struct ldlm_lock **lockp, void *req_cookie,
3414                              ldlm_mode_t mode, __u64 flags, void *data)
3415 {
3416         struct tgt_session_info *tsi;
3417         struct mdt_thread_info  *info;
3418         struct ptlrpc_request   *req  =  req_cookie;
3419         struct ldlm_intent      *it;
3420         struct req_capsule      *pill;
3421         int rc;
3422
3423         ENTRY;
3424
3425         LASSERT(req != NULL);
3426
3427         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3428
3429         info = tsi2mdt_info(tsi);
3430         LASSERT(info != NULL);
3431         pill = info->mti_pill;
3432         LASSERT(pill->rc_req == req);
3433
3434         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3435                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3436                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3437                 if (it != NULL) {
3438                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3439                         if (rc == 0)
3440                                 rc = ELDLM_OK;
3441
3442                         /* Lock without inodebits makes no sense and will oops
3443                          * later in ldlm. Let's check it now to see if we have
3444                          * ibits corrupted somewhere in mdt_intent_opc().
3445                          * The case for client miss to set ibits has been
3446                          * processed by others. */
3447                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3448                                         lr_type == LDLM_IBITS,
3449                                      info->mti_dlm_req->lock_desc.\
3450                                         l_policy_data.l_inodebits.bits != 0));
3451                 } else
3452                         rc = err_serious(-EFAULT);
3453         } else {
3454                 /* No intent was provided */
3455                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3456                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3457                 rc = req_capsule_server_pack(pill);
3458                 if (rc)
3459                         rc = err_serious(rc);
3460         }
3461         mdt_thread_info_fini(info);
3462         RETURN(rc);
3463 }
3464
3465 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3466 {
3467         struct seq_server_site  *ss = mdt_seq_site(mdt);
3468
3469         if (ss->ss_node_id == 0)
3470                 return;
3471
3472         if (ss->ss_client_seq != NULL) {
3473                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3474                 ss->ss_client_seq->lcs_exp = NULL;
3475         }
3476
3477         if (ss->ss_server_fld != NULL) {
3478                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3479                 ss->ss_server_fld->lsf_control_exp = NULL;
3480         }
3481 }
3482
3483 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3484 {
3485         struct seq_server_site *ss = mdt_seq_site(mdt);
3486
3487         if (ss == NULL)
3488                 return;
3489
3490         if (ss->ss_server_seq != NULL)
3491                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3492 }
3493
3494 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3495 {
3496         mdt_seq_fini_cli(mdt);
3497         mdt_deregister_seq_exp(mdt);
3498
3499         return seq_site_fini(env, mdt_seq_site(mdt));
3500 }
3501
3502 /**
3503  * It will retrieve its FLDB entries from MDT0, and it only happens
3504  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3505  * and it needs to refresh FLDB from the MDT0.
3506  **/
3507 static int mdt_register_lwp_callback(void *data)
3508 {
3509         struct lu_env           env;
3510         struct mdt_device       *mdt = data;
3511         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3512         int                     rc;
3513         ENTRY;
3514
3515         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3516
3517         if (!likely(fld->lsf_new))
3518                 RETURN(0);
3519
3520         rc = lu_env_init(&env, LCT_MD_THREAD);
3521         if (rc) {
3522                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3523                 RETURN(rc);
3524         }
3525
3526         rc = fld_update_from_controller(&env, fld);
3527         if (rc != 0) {
3528                 CERROR("%s: cannot update controller: rc = %d\n",
3529                        mdt_obd_name(mdt), rc);
3530                 GOTO(out, rc);
3531         }
3532 out:
3533         lu_env_fini(&env);
3534         RETURN(rc);
3535 }
3536
3537 static int mdt_register_seq_exp(struct mdt_device *mdt)
3538 {
3539         struct seq_server_site  *ss = mdt_seq_site(mdt);
3540         char                    *lwp_name = NULL;
3541         int                     rc;
3542
3543         if (ss->ss_node_id == 0)
3544                 return 0;
3545
3546         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3547         if (lwp_name == NULL)
3548                 GOTO(out_free, rc = -ENOMEM);
3549
3550         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3551         if (rc != 0)
3552                 GOTO(out_free, rc);
3553
3554         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3555                                       NULL, NULL);
3556         if (rc != 0)
3557                 GOTO(out_free, rc);
3558
3559         rc = lustre_register_lwp_item(lwp_name,
3560                                       &ss->ss_server_fld->lsf_control_exp,
3561                                       mdt_register_lwp_callback, mdt);
3562         if (rc != 0) {
3563                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3564                 ss->ss_client_seq->lcs_exp = NULL;
3565                 GOTO(out_free, rc);
3566         }
3567 out_free:
3568         if (lwp_name != NULL)
3569                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3570
3571         return rc;
3572 }
3573
3574 /*
3575  * Init client sequence manager which is used by local MDS to talk to sequence
3576  * controller on remote node.
3577  */
3578 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3579 {
3580         struct seq_server_site  *ss = mdt_seq_site(mdt);
3581         int                     rc;
3582         char                    *prefix;
3583         ENTRY;
3584
3585         /* check if this is adding the first MDC and controller is not yet
3586          * initialized. */
3587         OBD_ALLOC_PTR(ss->ss_client_seq);
3588         if (ss->ss_client_seq == NULL)
3589                 RETURN(-ENOMEM);
3590
3591         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3592         if (prefix == NULL) {
3593                 OBD_FREE_PTR(ss->ss_client_seq);
3594                 ss->ss_client_seq = NULL;
3595                 RETURN(-ENOMEM);
3596         }
3597
3598         /* Note: seq_client_fini will be called in seq_site_fini */
3599         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3600         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3601                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3602                                                             NULL);
3603         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3604         if (rc != 0) {
3605                 OBD_FREE_PTR(ss->ss_client_seq);
3606                 ss->ss_client_seq = NULL;
3607                 RETURN(rc);
3608         }
3609
3610         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3611
3612         RETURN(rc);
3613 }
3614
3615 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3616 {
3617         struct seq_server_site  *ss;
3618         int                     rc;
3619         ENTRY;
3620
3621         ss = mdt_seq_site(mdt);
3622         /* init sequence controller server(MDT0) */
3623         if (ss->ss_node_id == 0) {
3624                 OBD_ALLOC_PTR(ss->ss_control_seq);
3625                 if (ss->ss_control_seq == NULL)
3626                         RETURN(-ENOMEM);
3627
3628                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3629                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3630                                      ss);
3631                 if (rc)
3632                         GOTO(out_seq_fini, rc);
3633         }
3634
3635         /* Init normal sequence server */
3636         OBD_ALLOC_PTR(ss->ss_server_seq);
3637         if (ss->ss_server_seq == NULL)
3638                 GOTO(out_seq_fini, rc = -ENOMEM);
3639
3640         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3641                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3642         if (rc)
3643                 GOTO(out_seq_fini, rc);
3644
3645         /* init seq client for seq server to talk to seq controller(MDT0) */
3646         rc = mdt_seq_init_cli(env, mdt);
3647         if (rc != 0)
3648                 GOTO(out_seq_fini, rc);
3649
3650         if (ss->ss_node_id != 0)
3651                 /* register controler export through lwp */
3652                 rc = mdt_register_seq_exp(mdt);
3653
3654         EXIT;
3655 out_seq_fini:
3656         if (rc)
3657                 mdt_seq_fini(env, mdt);
3658
3659         return rc;
3660 }
3661
3662 /*
3663  * FLD wrappers
3664  */
3665 static int mdt_fld_fini(const struct lu_env *env,
3666                         struct mdt_device *m)
3667 {
3668         struct seq_server_site *ss = mdt_seq_site(m);
3669         ENTRY;
3670
3671         if (ss && ss->ss_server_fld) {
3672                 fld_server_fini(env, ss->ss_server_fld);
3673                 OBD_FREE_PTR(ss->ss_server_fld);
3674                 ss->ss_server_fld = NULL;
3675         }
3676
3677         RETURN(0);
3678 }
3679
3680 static int mdt_fld_init(const struct lu_env *env,
3681                         const char *uuid,
3682                         struct mdt_device *m)
3683 {
3684         struct seq_server_site *ss;
3685         int rc;
3686         ENTRY;
3687
3688         ss = mdt_seq_site(m);
3689
3690         OBD_ALLOC_PTR(ss->ss_server_fld);
3691         if (ss->ss_server_fld == NULL)
3692                 RETURN(rc = -ENOMEM);
3693
3694         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3695                              LU_SEQ_RANGE_MDT);
3696         if (rc) {
3697                 OBD_FREE_PTR(ss->ss_server_fld);
3698                 ss->ss_server_fld = NULL;
3699                 RETURN(rc);
3700         }
3701
3702         RETURN(0);
3703 }
3704
3705 static void mdt_stack_pre_fini(const struct lu_env *env,
3706                            struct mdt_device *m, struct lu_device *top)
3707 {
3708         struct lustre_cfg_bufs  *bufs;
3709         struct lustre_cfg       *lcfg;
3710         struct mdt_thread_info  *info;
3711         ENTRY;
3712
3713         LASSERT(top);
3714
3715         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3716         LASSERT(info != NULL);
3717
3718         bufs = &info->mti_u.bufs;
3719
3720         LASSERT(m->mdt_child_exp);
3721         LASSERT(m->mdt_child_exp->exp_obd);
3722
3723         /* process cleanup, pass mdt obd name to get obd umount flags */
3724         /* XXX: this is needed because all layers are referenced by
3725          * objects (some of them are pinned by osd, for example *
3726          * the proper solution should be a model where object used
3727          * by osd only doesn't have mdt/mdd slices -bzzz */
3728         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3729         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3730         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3731         if (lcfg == NULL)
3732                 RETURN_EXIT;
3733
3734         top->ld_ops->ldo_process_config(env, top, lcfg);
3735         lustre_cfg_free(lcfg);
3736         EXIT;
3737 }
3738
3739 static void mdt_stack_fini(const struct lu_env *env,
3740                            struct mdt_device *m, struct lu_device *top)
3741 {
3742         struct obd_device       *obd = mdt2obd_dev(m);
3743         struct lustre_cfg_bufs  *bufs;
3744         struct lustre_cfg       *lcfg;
3745         struct mdt_thread_info  *info;
3746         char                     flags[3] = "";
3747         ENTRY;
3748
3749         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3750         LASSERT(info != NULL);
3751
3752         lu_dev_del_linkage(top->ld_site, top);
3753
3754         lu_site_purge(env, top->ld_site, -1);
3755
3756         bufs = &info->mti_u.bufs;
3757         /* process cleanup, pass mdt obd name to get obd umount flags */
3758         /* another purpose is to let all layers to release their objects */
3759         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3760         if (obd->obd_force)
3761                 strcat(flags, "F");
3762         if (obd->obd_fail)
3763                 strcat(flags, "A");
3764         lustre_cfg_bufs_set_string(bufs, 1, flags);
3765         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3766         if (lcfg == NULL)
3767                 RETURN_EXIT;
3768
3769         LASSERT(top);
3770         top->ld_ops->ldo_process_config(env, top, lcfg);
3771         lustre_cfg_free(lcfg);
3772
3773         lu_site_purge(env, top->ld_site, -1);
3774
3775         m->mdt_child = NULL;
3776         m->mdt_bottom = NULL;
3777
3778         obd_disconnect(m->mdt_child_exp);
3779         m->mdt_child_exp = NULL;
3780
3781         obd_disconnect(m->mdt_bottom_exp);
3782         m->mdt_child_exp = NULL;
3783 }
3784
3785 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3786                                const char *next, struct obd_export **exp)
3787 {
3788         struct obd_connect_data *data = NULL;
3789         struct obd_device       *obd;
3790         int                      rc;
3791         ENTRY;
3792
3793         OBD_ALLOC_PTR(data);
3794         if (data == NULL)
3795                 GOTO(out, rc = -ENOMEM);
3796
3797         obd = class_name2obd(next);
3798         if (obd == NULL) {
3799                 CERROR("%s: can't locate next device: %s\n",
3800                        mdt_obd_name(m), next);
3801                 GOTO(out, rc = -ENOTCONN);
3802         }
3803
3804         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3805         data->ocd_version = LUSTRE_VERSION_CODE;
3806
3807         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3808         if (rc) {
3809                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3810                        mdt_obd_name(m), next, rc);
3811                 GOTO(out, rc);
3812         }
3813
3814 out:
3815         if (data)
3816                 OBD_FREE_PTR(data);
3817         RETURN(rc);
3818 }
3819
3820 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3821                           struct lustre_cfg *cfg)
3822 {
3823         char                   *dev = lustre_cfg_string(cfg, 0);
3824         int                     rc, name_size, uuid_size;
3825         char                   *name, *uuid, *p;
3826         struct lustre_cfg_bufs *bufs;
3827         struct lustre_cfg      *lcfg;
3828         struct obd_device      *obd;
3829         struct lustre_profile  *lprof;
3830         struct lu_site         *site;
3831         ENTRY;
3832
3833         /* in 1.8 we had the only device in the stack - MDS.
3834          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3835          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3836          * to generate names and setup MDT, MDD. MDT will be using
3837          * generated name to connect to MDD. for MDD the next device
3838          * will be LOD with name taken from so called "profile" which
3839          * is generated by mount_option line
3840          *
3841          * 1.8 MGS generates config. commands like this:
3842          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3843          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3844          * 2.0 MGS generates config. commands like this:
3845          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3846          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3847          *                    3:lustre-MDT0000-mdtlov  4:f
3848          *
3849          * we generate MDD name from MDT one, just replacing T with D
3850          *
3851          * after all the preparations, the logical equivalent will be
3852          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3853          *                    3:lustre-MDT0000-mdtlov  4:f
3854          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3855          *                    3:lustre-MDD0000  4:f
3856          *
3857          *  notice we build the stack from down to top: MDD first, then MDT */
3858
3859         name_size = MAX_OBD_NAME;
3860         uuid_size = MAX_OBD_NAME;
3861
3862         OBD_ALLOC(name, name_size);
3863         OBD_ALLOC(uuid, uuid_size);
3864         if (name == NULL || uuid == NULL)
3865                 GOTO(cleanup_mem, rc = -ENOMEM);
3866
3867         OBD_ALLOC_PTR(bufs);
3868         if (!bufs)
3869                 GOTO(cleanup_mem, rc = -ENOMEM);
3870
3871         strcpy(name, dev);
3872         p = strstr(name, "-MDT");
3873         if (p == NULL)
3874                 GOTO(free_bufs, rc = -ENOMEM);
3875         p[3] = 'D';
3876
3877         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3878
3879         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3880         if (lprof == NULL || lprof->lp_dt == NULL) {
3881                 CERROR("can't find the profile: %s\n",
3882                        lustre_cfg_string(cfg, 0));
3883                 GOTO(free_bufs, rc = -EINVAL);
3884         }
3885
3886         lustre_cfg_bufs_reset(bufs, name);
3887         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
3888         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3889         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3890
3891         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3892         if (lcfg == NULL)
3893                 GOTO(free_bufs, rc = -ENOMEM);
3894
3895         rc = class_attach(lcfg);
3896         if (rc)
3897                 GOTO(lcfg_cleanup, rc);
3898
3899         obd = class_name2obd(name);
3900         if (!obd) {
3901                 CERROR("Can not find obd %s (%s in config)\n",
3902                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
3903                 GOTO(lcfg_cleanup, rc = -EINVAL);
3904         }
3905
3906         lustre_cfg_free(lcfg);
3907
3908         lustre_cfg_bufs_reset(bufs, name);
3909         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3910         lustre_cfg_bufs_set_string(bufs, 2, dev);
3911         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3912
3913         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3914         if (lcfg == NULL)
3915                 GOTO(class_detach, rc = -ENOMEM);
3916
3917         rc = class_setup(obd, lcfg);
3918         if (rc)
3919                 GOTO(class_detach, rc);
3920
3921         /* connect to MDD we just setup */
3922         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
3923         if (rc)
3924                 GOTO(class_detach, rc);
3925
3926         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
3927         LASSERT(site);
3928         LASSERT(mdt_lu_site(mdt) == NULL);
3929         mdt->mdt_lu_dev.ld_site = site;
3930         site->ls_top_dev = &mdt->mdt_lu_dev;
3931         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
3932
3933         /* now connect to bottom OSD */
3934         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
3935         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
3936         if (rc)
3937                 GOTO(class_detach, rc);
3938         mdt->mdt_bottom =
3939                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
3940
3941         rc = lu_env_refill((struct lu_env *)env);
3942         if (rc != 0)
3943                 CERROR("Failure to refill session: '%d'\n", rc);
3944
3945         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
3946
3947         EXIT;
3948 class_detach:
3949         if (rc)
3950                 class_detach(obd, lcfg);
3951 lcfg_cleanup:
3952         lustre_cfg_free(lcfg);
3953 free_bufs:
3954         OBD_FREE_PTR(bufs);
3955 cleanup_mem:
3956         if (name)
3957                 OBD_FREE(name, name_size);
3958         if (uuid)
3959                 OBD_FREE(uuid, uuid_size);
3960         RETURN(rc);
3961 }
3962
3963 /* setup quota master target on MDT0 */
3964 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
3965                           struct lustre_cfg *cfg)
3966 {
3967         struct obd_device       *obd;
3968         char                    *dev = lustre_cfg_string(cfg, 0);
3969         char                    *qmtname, *uuid, *p;
3970         struct lustre_cfg_bufs  *bufs;
3971         struct lustre_cfg       *lcfg;
3972         struct lustre_profile   *lprof;
3973         struct obd_connect_data *data;
3974         int                      rc;
3975         ENTRY;
3976
3977         LASSERT(mdt->mdt_qmt_exp == NULL);
3978         LASSERT(mdt->mdt_qmt_dev == NULL);
3979
3980         /* quota master is on MDT0 only for now */
3981         if (mdt->mdt_seq_site.ss_node_id != 0)
3982                 RETURN(0);
3983
3984         /* MGS generates config commands which look as follows:
3985          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3986          *                    3:lustre-MDT0000-mdtlov  4:f
3987          *
3988          * We generate the QMT name from the MDT one, just replacing MD with QM
3989          * after all the preparations, the logical equivalent will be:
3990          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
3991          *                    3:lustre-MDT0000-osd  4:f */
3992         OBD_ALLOC(qmtname, MAX_OBD_NAME);
3993         OBD_ALLOC(uuid, UUID_MAX);
3994         OBD_ALLOC_PTR(bufs);
3995         OBD_ALLOC_PTR(data);
3996         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
3997                 GOTO(cleanup_mem, rc = -ENOMEM);
3998
3999         strcpy(qmtname, dev);
4000         p = strstr(qmtname, "-MDT");
4001         if (p == NULL)
4002                 GOTO(cleanup_mem, rc = -ENOMEM);
4003         /* replace MD with QM */
4004         p[1] = 'Q';
4005         p[2] = 'M';
4006
4007         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4008
4009         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4010         if (lprof == NULL || lprof->lp_dt == NULL) {
4011                 CERROR("can't find profile for %s\n",
4012                        lustre_cfg_string(cfg, 0));
4013                 GOTO(cleanup_mem, rc = -EINVAL);
4014         }
4015
4016         lustre_cfg_bufs_reset(bufs, qmtname);
4017         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4018         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4019         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4020
4021         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4022         if (lcfg == NULL)
4023                 GOTO(cleanup_mem, rc = -ENOMEM);
4024
4025         rc = class_attach(lcfg);
4026         if (rc)
4027                 GOTO(lcfg_cleanup, rc);
4028
4029         obd = class_name2obd(qmtname);
4030         if (!obd) {
4031                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4032                        lustre_cfg_string(cfg, 0));
4033                 GOTO(lcfg_cleanup, rc = -EINVAL);
4034         }
4035
4036         lustre_cfg_free(lcfg);
4037
4038         lustre_cfg_bufs_reset(bufs, qmtname);
4039         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4040         lustre_cfg_bufs_set_string(bufs, 2, dev);
4041
4042         /* for quota, the next device should be the OSD device */
4043         lustre_cfg_bufs_set_string(bufs, 3,
4044                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4045
4046         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4047         if (lcfg == NULL)
4048                 GOTO(class_detach, rc = -ENOMEM);
4049
4050         rc = class_setup(obd, lcfg);
4051         if (rc)
4052                 GOTO(class_detach, rc);
4053
4054         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4055
4056         /* configure local quota objects */
4057         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4058                                                    &mdt->mdt_lu_dev,
4059                                                    mdt->mdt_qmt_dev);
4060         if (rc)
4061                 GOTO(class_cleanup, rc);
4062
4063         /* connect to quota master target */
4064         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4065         data->ocd_version = LUSTRE_VERSION_CODE;
4066         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4067                          data, NULL);
4068         if (rc) {
4069                 CERROR("cannot connect to quota master device %s (%d)\n",
4070                        qmtname, rc);
4071                 GOTO(class_cleanup, rc);
4072         }
4073
4074         EXIT;
4075 class_cleanup:
4076         if (rc) {
4077                 class_manual_cleanup(obd);
4078                 mdt->mdt_qmt_dev = NULL;
4079         }
4080 class_detach:
4081         if (rc)
4082                 class_detach(obd, lcfg);
4083 lcfg_cleanup:
4084         lustre_cfg_free(lcfg);
4085 cleanup_mem:
4086         if (bufs)
4087                 OBD_FREE_PTR(bufs);
4088         if (qmtname)
4089                 OBD_FREE(qmtname, MAX_OBD_NAME);
4090         if (uuid)
4091                 OBD_FREE(uuid, UUID_MAX);
4092         if (data)
4093                 OBD_FREE_PTR(data);
4094         return rc;
4095 }
4096
4097 /* Shutdown quota master target associated with mdt */
4098 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4099 {
4100         ENTRY;
4101
4102         if (mdt->mdt_qmt_exp == NULL)
4103                 RETURN_EXIT;
4104         LASSERT(mdt->mdt_qmt_dev != NULL);
4105
4106         /* the qmt automatically shuts down when the mdt disconnects */
4107         obd_disconnect(mdt->mdt_qmt_exp);
4108         mdt->mdt_qmt_exp = NULL;
4109         mdt->mdt_qmt_dev = NULL;
4110         EXIT;
4111 }
4112
4113 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4114  * for now. This will be removed along with converting rest of MDT code
4115  * to use tgt_session_info */
4116 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4117 {
4118         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4119         int                      rc;
4120
4121         rc = mdt_getxattr(info);
4122
4123         mdt_thread_info_fini(info);
4124         return rc;
4125 }
4126
4127 static struct tgt_handler mdt_tgt_handlers[] = {
4128 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4129                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4130                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4131 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4132                 0,                      MDS_DISCONNECT, tgt_disconnect,
4133                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4134 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4135                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4136                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4137 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4138 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
4139 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4140 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4141                                                         mdt_getattr_name),
4142 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4143 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4144 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4145 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4146 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4147 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4148 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4149 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4150                                                         mdt_hsm_progress),
4151 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4152                                                         mdt_hsm_ct_register),
4153 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4154                                                         mdt_hsm_ct_unregister),
4155 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4156                                                         mdt_hsm_state_get),
4157 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4158                                                         mdt_hsm_state_set),
4159 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4160 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4161                                                         mdt_hsm_request),
4162 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4163             MDS_SWAP_LAYOUTS,
4164             mdt_swap_layouts),
4165 };
4166
4167 static struct tgt_handler mdt_sec_ctx_ops[] = {
4168 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4169 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4170 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4171 };
4172
4173 static struct tgt_handler mdt_quota_ops[] = {
4174 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4175 };
4176
4177 static struct tgt_opc_slice mdt_common_slice[] = {
4178         {
4179                 .tos_opc_start  = MDS_FIRST_OPC,
4180                 .tos_opc_end    = MDS_LAST_OPC,
4181                 .tos_hs         = mdt_tgt_handlers
4182         },
4183         {
4184                 .tos_opc_start  = OBD_FIRST_OPC,
4185                 .tos_opc_end    = OBD_LAST_OPC,
4186                 .tos_hs         = tgt_obd_handlers
4187         },
4188         {
4189                 .tos_opc_start  = LDLM_FIRST_OPC,
4190                 .tos_opc_end    = LDLM_LAST_OPC,
4191                 .tos_hs         = tgt_dlm_handlers
4192         },
4193         {
4194                 .tos_opc_start  = SEC_FIRST_OPC,
4195                 .tos_opc_end    = SEC_LAST_OPC,
4196                 .tos_hs         = mdt_sec_ctx_ops
4197         },
4198         {
4199                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4200                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4201                 .tos_hs         = tgt_out_handlers
4202         },
4203         {
4204                 .tos_opc_start  = FLD_FIRST_OPC,
4205                 .tos_opc_end    = FLD_LAST_OPC,
4206                 .tos_hs         = fld_handlers
4207         },
4208         {
4209                 .tos_opc_start  = SEQ_FIRST_OPC,
4210                 .tos_opc_end    = SEQ_LAST_OPC,
4211                 .tos_hs         = seq_handlers
4212         },
4213         {
4214                 .tos_opc_start  = QUOTA_DQACQ,
4215                 .tos_opc_end    = QUOTA_LAST_OPC,
4216                 .tos_hs         = mdt_quota_ops
4217         },
4218         {
4219                 .tos_opc_start  = LLOG_FIRST_OPC,
4220                 .tos_opc_end    = LLOG_LAST_OPC,
4221                 .tos_hs         = tgt_llog_handlers
4222         },
4223         {
4224                 .tos_opc_start  = LFSCK_FIRST_OPC,
4225                 .tos_opc_end    = LFSCK_LAST_OPC,
4226                 .tos_hs         = tgt_lfsck_handlers
4227         },
4228
4229         {
4230                 .tos_hs         = NULL
4231         }
4232 };
4233
4234 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4235 {
4236         struct md_device        *next = m->mdt_child;
4237         struct lu_device        *d    = &m->mdt_lu_dev;
4238         struct obd_device       *obd  = mdt2obd_dev(m);
4239         struct lfsck_stop        stop;
4240         ENTRY;
4241
4242         stop.ls_status = LS_PAUSED;
4243         stop.ls_flags = 0;
4244         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4245
4246         target_recovery_fini(obd);
4247         ping_evictor_stop();
4248         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4249
4250         if (m->mdt_opts.mo_coordinator)
4251                 mdt_hsm_cdt_stop(m);
4252
4253         mdt_hsm_cdt_fini(m);
4254
4255         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4256         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4257         obd_exports_barrier(obd);
4258         obd_zombie_barrier();
4259
4260         mdt_procfs_fini(m);
4261
4262         tgt_fini(env, &m->mdt_lut);
4263         mdt_fs_cleanup(env, m);
4264         upcall_cache_cleanup(m->mdt_identity_cache);
4265         m->mdt_identity_cache = NULL;
4266
4267         if (m->mdt_namespace != NULL) {
4268                 ldlm_namespace_free(m->mdt_namespace, NULL,
4269                                     d->ld_obd->obd_force);
4270                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4271         }
4272
4273         mdt_quota_fini(env, m);
4274
4275         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4276
4277         mdt_seq_fini(env, m);
4278         mdt_fld_fini(env, m);
4279
4280         /*
4281          * Finish the stack
4282          */
4283         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4284
4285         LASSERT(atomic_read(&d->ld_ref) == 0);
4286
4287         server_put_mount(mdt_obd_name(m), true);
4288
4289         EXIT;
4290 }
4291
4292 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4293
4294 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4295                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4296 {
4297         struct mdt_thread_info    *info;
4298         struct obd_device         *obd;
4299         const char                *dev = lustre_cfg_string(cfg, 0);
4300         const char                *num = lustre_cfg_string(cfg, 2);
4301         struct lustre_mount_info  *lmi = NULL;
4302         struct lustre_sb_info     *lsi;
4303         struct lu_site            *s;
4304         struct seq_server_site    *ss_site;
4305         const char                *identity_upcall = "NONE";
4306         struct md_device          *next;
4307         int                        rc;
4308         long                       node_id;
4309         mntopt_t                   mntopts;
4310         ENTRY;
4311
4312         lu_device_init(&m->mdt_lu_dev, ldt);
4313         /*
4314          * Environment (env) might be missing mdt_thread_key values at that
4315          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4316          * mode.
4317          *
4318          * Usually device allocation path doesn't use module key values, but
4319          * mdt has to do a lot of work here, so allocate key value.
4320          */
4321         rc = lu_env_refill((struct lu_env *)env);
4322         if (rc != 0)
4323                 RETURN(rc);
4324
4325         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4326         LASSERT(info != NULL);
4327
4328         obd = class_name2obd(dev);
4329         LASSERT(obd != NULL);
4330
4331         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4332
4333         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4334
4335         /* default is coordinator off, it is started through conf_param
4336          * or /proc */
4337         m->mdt_opts.mo_coordinator = 0;
4338
4339         lmi = server_get_mount(dev);
4340         if (lmi == NULL) {
4341                 CERROR("Cannot get mount info for %s!\n", dev);
4342                 RETURN(-EFAULT);
4343         } else {
4344                 lsi = s2lsi(lmi->lmi_sb);
4345                 /* CMD is supported only in IAM mode */
4346                 LASSERT(num);
4347                 node_id = simple_strtol(num, NULL, 10);
4348                 obd->u.obt.obt_magic = OBT_MAGIC;
4349         }
4350
4351         m->mdt_squash.rsi_uid = 0;
4352         m->mdt_squash.rsi_gid = 0;
4353         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4354         init_rwsem(&m->mdt_squash.rsi_sem);
4355         spin_lock_init(&m->mdt_osfs_lock);
4356         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4357         m->mdt_enable_remote_dir = 0;
4358         m->mdt_enable_remote_dir_gid = 0;
4359
4360         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4361         m->mdt_lu_dev.ld_obd = obd;
4362         /* Set this lu_device to obd for error handling purposes. */
4363         obd->obd_lu_dev = &m->mdt_lu_dev;
4364
4365         /* init the stack */
4366         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4367         if (rc) {
4368                 CERROR("%s: Can't init device stack, rc %d\n",
4369                        mdt_obd_name(m), rc);
4370                 GOTO(err_lmi, rc);
4371         }
4372
4373         s = mdt_lu_site(m);
4374         ss_site = mdt_seq_site(m);
4375         s->ld_seq_site = ss_site;
4376         ss_site->ss_lu = s;
4377
4378         /* set server index */
4379         ss_site->ss_node_id = node_id;
4380
4381         /* failover is the default
4382          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4383          * assumed whose ss_node_id == 0 XXX
4384          * */
4385         obd->obd_replayable = 1;
4386         /* No connection accepted until configurations will finish */
4387         obd->obd_no_conn = 1;
4388
4389         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4390                 char *str = lustre_cfg_string(cfg, 4);
4391                 if (strchr(str, 'n')) {
4392                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4393                         obd->obd_replayable = 0;
4394                 }
4395         }
4396
4397         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4398         if (rc)
4399                 GOTO(err_fini_stack, rc);
4400
4401         rc = mdt_seq_init(env, m);
4402         if (rc)
4403                 GOTO(err_fini_fld, rc);
4404
4405         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4406                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4407         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4408                                               LDLM_NAMESPACE_SERVER,
4409                                               LDLM_NAMESPACE_GREEDY,
4410                                               LDLM_NS_TYPE_MDT);
4411         if (m->mdt_namespace == NULL)
4412                 GOTO(err_fini_seq, rc = -ENOMEM);
4413
4414         m->mdt_namespace->ns_lvbp = m;
4415         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4416
4417         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4418         /* set obd_namespace for compatibility with old code */
4419         obd->obd_namespace = m->mdt_namespace;
4420
4421         rc = mdt_hsm_cdt_init(m);
4422         if (rc != 0) {
4423                 CERROR("%s: error initializing coordinator, rc %d\n",
4424                        mdt_obd_name(m), rc);
4425                 GOTO(err_free_ns, rc);
4426         }
4427
4428         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4429                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4430                       OBD_FAIL_MDS_ALL_REPLY_NET);
4431         if (rc)
4432                 GOTO(err_free_hsm, rc);
4433
4434         rc = mdt_fs_setup(env, m, obd, lsi);
4435         if (rc)
4436                 GOTO(err_tgt, rc);
4437
4438         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4439
4440         next = m->mdt_child;
4441         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4442                                          &mntopts);
4443         if (rc)
4444                 GOTO(err_fs_cleanup, rc);
4445
4446         if (mntopts & MNTOPT_USERXATTR)
4447                 m->mdt_opts.mo_user_xattr = 1;
4448         else
4449                 m->mdt_opts.mo_user_xattr = 0;
4450
4451         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4452         if (rc)
4453                 GOTO(err_fs_cleanup, rc);
4454
4455         if (mntopts & MNTOPT_ACL)
4456                 m->mdt_opts.mo_acl = 1;
4457         else
4458                 m->mdt_opts.mo_acl = 0;
4459
4460         /* XXX: to support suppgid for ACL, we enable identity_upcall
4461          * by default, otherwise, maybe got unexpected -EACCESS. */
4462         if (m->mdt_opts.mo_acl)
4463                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4464
4465         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4466                                                 identity_upcall,
4467                                                 &mdt_identity_upcall_cache_ops);
4468         if (IS_ERR(m->mdt_identity_cache)) {
4469                 rc = PTR_ERR(m->mdt_identity_cache);
4470                 m->mdt_identity_cache = NULL;
4471                 GOTO(err_fs_cleanup, rc);
4472         }
4473
4474         rc = mdt_procfs_init(m, dev);
4475         if (rc) {
4476                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4477                 GOTO(err_recovery, rc);
4478         }
4479
4480         rc = mdt_quota_init(env, m, cfg);
4481         if (rc)
4482                 GOTO(err_procfs, rc);
4483
4484         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4485         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4486                            "mdt_ldlm_client", m->mdt_ldlm_client);
4487
4488         ping_evictor_start();
4489
4490         /* recovery will be started upon mdt_prepare()
4491          * when the whole stack is complete and ready
4492          * to serve the requests */
4493
4494         /* Reduce the initial timeout on an MDS because it doesn't need such
4495          * a long timeout as an OST does. Adaptive timeouts will adjust this
4496          * value appropriately. */
4497         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4498                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4499
4500         RETURN(0);
4501 err_procfs:
4502         mdt_procfs_fini(m);
4503 err_recovery:
4504         target_recovery_fini(obd);
4505         upcall_cache_cleanup(m->mdt_identity_cache);
4506         m->mdt_identity_cache = NULL;
4507 err_fs_cleanup:
4508         mdt_fs_cleanup(env, m);
4509 err_tgt:
4510         tgt_fini(env, &m->mdt_lut);
4511 err_free_hsm:
4512         mdt_hsm_cdt_fini(m);
4513 err_free_ns:
4514         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4515         obd->obd_namespace = m->mdt_namespace = NULL;
4516 err_fini_seq:
4517         mdt_seq_fini(env, m);
4518 err_fini_fld:
4519         mdt_fld_fini(env, m);
4520 err_fini_stack:
4521         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4522 err_lmi:
4523         if (lmi)
4524                 server_put_mount(dev, true);
4525         return(rc);
4526 }
4527
4528 /* For interoperability, the left element is old parameter, the right one
4529  * is the new version of the parameter, if some parameter is deprecated,
4530  * the new version should be set as NULL. */
4531 static struct cfg_interop_param mdt_interop_param[] = {
4532         { "mdt.group_upcall",   NULL },
4533         { "mdt.quota_type",     NULL },
4534         { "mdd.quota_type",     NULL },
4535         { "mdt.rootsquash",     "mdt.root_squash" },
4536         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4537         { NULL }
4538 };
4539
4540 /* used by MGS to process specific configurations */
4541 static int mdt_process_config(const struct lu_env *env,
4542                               struct lu_device *d, struct lustre_cfg *cfg)
4543 {
4544         struct mdt_device *m = mdt_dev(d);
4545         struct md_device *md_next = m->mdt_child;
4546         struct lu_device *next = md2lu_dev(md_next);
4547         int rc;
4548         ENTRY;
4549
4550         switch (cfg->lcfg_command) {
4551         case LCFG_PARAM: {
4552                 struct obd_device          *obd = d->ld_obd;
4553
4554                 /* For interoperability */
4555                 struct cfg_interop_param   *ptr = NULL;
4556                 struct lustre_cfg          *old_cfg = NULL;
4557                 char                       *param = NULL;
4558
4559                 param = lustre_cfg_string(cfg, 1);
4560                 if (param == NULL) {
4561                         CERROR("param is empty\n");
4562                         rc = -EINVAL;
4563                         break;
4564                 }
4565
4566                 ptr = class_find_old_param(param, mdt_interop_param);
4567                 if (ptr != NULL) {
4568                         if (ptr->new_param == NULL) {
4569                                 rc = 0;
4570                                 CWARN("For interoperability, skip this %s."
4571                                       " It is obsolete.\n", ptr->old_param);
4572                                 break;
4573                         }
4574
4575                         CWARN("Found old param %s, changed it to %s.\n",
4576                               ptr->old_param, ptr->new_param);
4577
4578                         old_cfg = cfg;
4579                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4580                         if (IS_ERR(cfg)) {
4581                                 rc = PTR_ERR(cfg);
4582                                 break;
4583                         }
4584                 }
4585
4586                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
4587                                               cfg, obd);
4588                 if (rc > 0 || rc == -ENOSYS) {
4589                         /* is it an HSM var ? */
4590                         rc = class_process_proc_param(PARAM_HSM,
4591                                                       hsm_cdt_get_proc_vars(),
4592                                                       cfg, obd);
4593                         if (rc > 0 || rc == -ENOSYS)
4594                                 /* we don't understand; pass it on */
4595                                 rc = next->ld_ops->ldo_process_config(env, next,
4596                                                                       cfg);
4597                 }
4598
4599                 if (old_cfg != NULL)
4600                         lustre_cfg_free(cfg);
4601
4602                 break;
4603         }
4604         default:
4605                 /* others are passed further */
4606                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4607                 break;
4608         }
4609         RETURN(rc);
4610 }
4611
4612 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4613                                           const struct lu_object_header *hdr,
4614                                           struct lu_device *d)
4615 {
4616         struct mdt_object *mo;
4617
4618         ENTRY;
4619
4620         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4621         if (mo != NULL) {
4622                 struct lu_object *o;
4623                 struct lu_object_header *h;
4624
4625                 o = &mo->mot_obj;
4626                 h = &mo->mot_header;
4627                 lu_object_header_init(h);
4628                 lu_object_init(o, h, d);
4629                 lu_object_add_top(h, o);
4630                 o->lo_ops = &mdt_obj_ops;
4631                 spin_lock_init(&mo->mot_write_lock);
4632                 mutex_init(&mo->mot_lov_mutex);
4633                 init_rwsem(&mo->mot_open_sem);
4634                 RETURN(o);
4635         }
4636         RETURN(NULL);
4637 }
4638
4639 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4640                            const struct lu_object_conf *unused)
4641 {
4642         struct mdt_device *d = mdt_dev(o->lo_dev);
4643         struct lu_device  *under;
4644         struct lu_object  *below;
4645         int                rc = 0;
4646         ENTRY;
4647
4648         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4649                PFID(lu_object_fid(o)));
4650
4651         under = &d->mdt_child->md_lu_dev;
4652         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4653         if (below != NULL) {
4654                 lu_object_add(o, below);
4655         } else
4656                 rc = -ENOMEM;
4657
4658         RETURN(rc);
4659 }
4660
4661 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4662 {
4663         struct mdt_object *mo = mdt_obj(o);
4664         struct lu_object_header *h;
4665         ENTRY;
4666
4667         h = o->lo_header;
4668         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4669                PFID(lu_object_fid(o)));
4670
4671         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4672         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4673
4674         lu_object_fini(o);
4675         lu_object_header_fini(h);
4676         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4677
4678         EXIT;
4679 }
4680
4681 static int mdt_object_print(const struct lu_env *env, void *cookie,
4682                             lu_printer_t p, const struct lu_object *o)
4683 {
4684         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4685
4686         return (*p)(env, cookie,
4687                     LUSTRE_MDT_NAME"-object@%p(flags=%d, writecount=%d)",
4688                     mdto, mdto->mot_flags, mdto->mot_write_count);
4689 }
4690
4691 static int mdt_prepare(const struct lu_env *env,
4692                 struct lu_device *pdev,
4693                 struct lu_device *cdev)
4694 {
4695         struct mdt_device *mdt = mdt_dev(cdev);
4696         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4697         struct obd_device *obd = cdev->ld_obd;
4698         int rc;
4699
4700         ENTRY;
4701
4702         LASSERT(obd);
4703
4704         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4705         if (rc)
4706                 RETURN(rc);
4707
4708         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4709         if (rc)
4710                 RETURN(rc);
4711
4712         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4713         if (rc)
4714                 RETURN(rc);
4715
4716         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4717         /* The LFSCK instance is registered just now, so it must be there when
4718          * register the namespace to such instance. */
4719         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4720
4721         if (mdt->mdt_seq_site.ss_node_id == 0) {
4722                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4723                                                          &mdt->mdt_md_root_fid);
4724                 if (rc)
4725                         RETURN(rc);
4726         }
4727
4728         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4729         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4730         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4731         LASSERT(obd->obd_no_conn);
4732         spin_lock(&obd->obd_dev_lock);
4733         obd->obd_no_conn = 0;
4734         spin_unlock(&obd->obd_dev_lock);
4735
4736         if (obd->obd_recovering == 0)
4737                 mdt_postrecov(env, mdt);
4738
4739         RETURN(rc);
4740 }
4741
4742 const struct lu_device_operations mdt_lu_ops = {
4743         .ldo_object_alloc   = mdt_object_alloc,
4744         .ldo_process_config = mdt_process_config,
4745         .ldo_prepare        = mdt_prepare,
4746 };
4747
4748 static const struct lu_object_operations mdt_obj_ops = {
4749         .loo_object_init    = mdt_object_init,
4750         .loo_object_free    = mdt_object_free,
4751         .loo_object_print   = mdt_object_print
4752 };
4753
4754 static int mdt_obd_set_info_async(const struct lu_env *env,
4755                                   struct obd_export *exp,
4756                                   __u32 keylen, void *key,
4757                                   __u32 vallen, void *val,
4758                                   struct ptlrpc_request_set *set)
4759 {
4760         int rc;
4761
4762         ENTRY;
4763
4764         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4765                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4766                 RETURN(rc);
4767         }
4768
4769         RETURN(0);
4770 }
4771
4772 /**
4773  * Match client and server connection feature flags.
4774  *
4775  * Compute the compatibility flags for a connection request based on
4776  * features mutually supported by client and server.
4777  *
4778  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4779  * must not be updated here, otherwise a partially initialized value may
4780  * be exposed. After the connection request is successfully processed,
4781  * the top-level MDT connect request handler atomically updates the export
4782  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4783  * reply. \see mdt_connect().
4784  *
4785  * \param exp   the obd_export associated with this client/target pair
4786  * \param mdt   the target device for the connection
4787  * \param data  stores data for this connect request
4788  *
4789  * \retval 0       success
4790  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4791  * \retval -EBADE  client and server feature requirements are incompatible
4792  */
4793 static int mdt_connect_internal(struct obd_export *exp,
4794                                 struct mdt_device *mdt,
4795                                 struct obd_connect_data *data)
4796 {
4797         LASSERT(data != NULL);
4798
4799         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4800         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4801
4802         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
4803             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
4804                 CWARN("%s: client %s does not support ibits lock, either "
4805                       "very old or an invalid client: flags "LPX64"\n",
4806                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
4807                       data->ocd_connect_flags);
4808                 return -EBADE;
4809         }
4810
4811         if (!mdt->mdt_opts.mo_acl)
4812                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4813
4814         if (!mdt->mdt_opts.mo_user_xattr)
4815                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4816
4817         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4818                 data->ocd_brw_size = min(data->ocd_brw_size,
4819                                          (__u32)MD_MAX_BRW_SIZE);
4820                 if (data->ocd_brw_size == 0) {
4821                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4822                                " ocd_version: %x ocd_grant: %d "
4823                                "ocd_index: %u ocd_brw_size is "
4824                                "unexpectedly zero, network data "
4825                                "corruption? Refusing connection of this"
4826                                " client\n",
4827                                mdt_obd_name(mdt),
4828                                exp->exp_client_uuid.uuid,
4829                                exp, data->ocd_connect_flags, data->ocd_version,
4830                                data->ocd_grant, data->ocd_index);
4831                         return -EPROTO;
4832                 }
4833         }
4834
4835         /* NB: Disregard the rule against updating
4836          * exp_connect_data.ocd_connect_flags in this case, since
4837          * tgt_client_new() needs to know if this is a lightweight
4838          * connection, and it is safe to expose this flag before
4839          * connection processing completes. */
4840         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
4841                 spin_lock(&exp->exp_lock);
4842                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
4843                 spin_unlock(&exp->exp_lock);
4844         }
4845
4846         data->ocd_version = LUSTRE_VERSION_CODE;
4847
4848         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
4849                 CWARN("%s: MDS requires FID support, but client not\n",
4850                       mdt_obd_name(mdt));
4851                 return -EBADE;
4852         }
4853
4854         if (OCD_HAS_FLAG(data, PINGLESS)) {
4855                 if (ptlrpc_pinger_suppress_pings()) {
4856                         spin_lock(&exp->exp_obd->obd_dev_lock);
4857                         list_del_init(&exp->exp_obd_chain_timed);
4858                         spin_unlock(&exp->exp_obd->obd_dev_lock);
4859                 } else {
4860                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
4861                 }
4862         }
4863
4864         data->ocd_max_easize = mdt->mdt_max_ea_size;
4865
4866         return 0;
4867 }
4868
4869 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
4870                                    struct mdt_thread_info *info,
4871                                    struct mdt_file_data *mfd)
4872 {
4873         struct lu_context ses;
4874         int rc;
4875         ENTRY;
4876
4877         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
4878         if (rc)
4879                 RETURN(rc);
4880
4881         env->le_ses = &ses;
4882         lu_context_enter(&ses);
4883
4884         mdt_ucred(info)->uc_valid = UCRED_OLD;
4885         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
4886
4887         lu_context_exit(&ses);
4888         lu_context_fini(&ses);
4889         env->le_ses = NULL;
4890
4891         RETURN(rc);
4892 }
4893
4894 static int mdt_export_cleanup(struct obd_export *exp)
4895 {
4896         struct list_head         closing_list;
4897         struct mdt_export_data  *med = &exp->exp_mdt_data;
4898         struct obd_device       *obd = exp->exp_obd;
4899         struct mdt_device       *mdt;
4900         struct mdt_thread_info  *info;
4901         struct lu_env            env;
4902         struct mdt_file_data    *mfd, *n;
4903         int rc = 0;
4904         ENTRY;
4905
4906         INIT_LIST_HEAD(&closing_list);
4907         spin_lock(&med->med_open_lock);
4908         while (!list_empty(&med->med_open_head)) {
4909                 struct list_head *tmp = med->med_open_head.next;
4910                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
4911
4912                 /* Remove mfd handle so it can't be found again.
4913                  * We are consuming the mfd_list reference here. */
4914                 class_handle_unhash(&mfd->mfd_handle);
4915                 list_move_tail(&mfd->mfd_list, &closing_list);
4916         }
4917         spin_unlock(&med->med_open_lock);
4918         mdt = mdt_dev(obd->obd_lu_dev);
4919         LASSERT(mdt != NULL);
4920
4921         rc = lu_env_init(&env, LCT_MD_THREAD);
4922         if (rc)
4923                 RETURN(rc);
4924
4925         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
4926         LASSERT(info != NULL);
4927         memset(info, 0, sizeof *info);
4928         info->mti_env = &env;
4929         info->mti_mdt = mdt;
4930         info->mti_exp = exp;
4931
4932         if (!list_empty(&closing_list)) {
4933                 struct md_attr *ma = &info->mti_attr;
4934
4935                 /* Close any open files (which may also cause orphan
4936                  * unlinking). */
4937                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
4938                         list_del_init(&mfd->mfd_list);
4939                         ma->ma_need = ma->ma_valid = 0;
4940
4941                         /* This file is being closed due to an eviction, it
4942                          * could have been modified and now dirty regarding to
4943                          * HSM archive, check this!
4944                          * The logic here is to mark a file dirty if there's a
4945                          * chance it was dirtied before the client was evicted,
4946                          * so that we don't have to wait for a release attempt
4947                          * before finding out the file was actually dirty and
4948                          * fail the release. Aggressively marking it dirty here
4949                          * will cause the policy engine to attempt to
4950                          * re-archive it; when rearchiving, we can compare the
4951                          * current version to the HSM data_version and make the
4952                          * archive request into a noop if it's not actually
4953                          * dirty.
4954                          */
4955                         if (mfd->mfd_mode & FMODE_WRITE)
4956                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
4957
4958                         /* Don't unlink orphan on failover umount, LU-184 */
4959                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
4960                                 ma->ma_valid = MA_FLAGS;
4961                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
4962                         }
4963                         mdt_mfd_close(info, mfd);
4964                 }
4965         }
4966         info->mti_mdt = NULL;
4967         /* cleanup client slot early */
4968         /* Do not erase record for recoverable client. */
4969         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
4970                 tgt_client_del(&env, exp);
4971         lu_env_fini(&env);
4972
4973         RETURN(rc);
4974 }
4975
4976 static int mdt_obd_disconnect(struct obd_export *exp)
4977 {
4978         int rc;
4979         ENTRY;
4980
4981         LASSERT(exp);
4982         class_export_get(exp);
4983
4984         nodemap_del_member(exp);
4985         rc = server_disconnect_export(exp);
4986         if (rc != 0)
4987                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
4988
4989         rc = mdt_export_cleanup(exp);
4990         class_export_put(exp);
4991         RETURN(rc);
4992 }
4993
4994 /* mds_connect copy */
4995 static int mdt_obd_connect(const struct lu_env *env,
4996                            struct obd_export **exp, struct obd_device *obd,
4997                            struct obd_uuid *cluuid,
4998                            struct obd_connect_data *data,
4999                            void *localdata)
5000 {
5001         struct obd_export       *lexp;
5002         struct lustre_handle    conn = { 0 };
5003         struct mdt_device       *mdt;
5004         int                      rc;
5005         lnet_nid_t              *client_nid = localdata;
5006         ENTRY;
5007
5008         LASSERT(env != NULL);
5009         if (!exp || !obd || !cluuid)
5010                 RETURN(-EINVAL);
5011
5012         mdt = mdt_dev(obd->obd_lu_dev);
5013
5014         /*
5015          * first, check whether the stack is ready to handle requests
5016          * XXX: probably not very appropriate method is used now
5017          *      at some point we should find a better one
5018          */
5019         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
5020             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5021                 rc = obd_get_info(env, mdt->mdt_child_exp,
5022                                   sizeof(KEY_OSP_CONNECTED),
5023                                   KEY_OSP_CONNECTED, NULL, NULL, NULL);
5024                 if (rc)
5025                         RETURN(-EAGAIN);
5026                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5027         }
5028
5029         rc = class_connect(&conn, obd, cluuid);
5030         if (rc)
5031                 RETURN(rc);
5032
5033         lexp = class_conn2export(&conn);
5034         LASSERT(lexp != NULL);
5035
5036         rc = mdt_connect_internal(lexp, mdt, data);
5037         if (rc == 0) {
5038                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5039
5040                 LASSERT(lcd);
5041                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5042                 rc = tgt_client_new(env, lexp);
5043                 if (rc == 0) {
5044                         rc = nodemap_add_member(*client_nid, lexp);
5045                         if (rc != 0 && rc != -EEXIST)
5046                                 goto out;
5047
5048                         mdt_export_stats_init(obd, lexp, localdata);
5049                 }
5050
5051                 /* For phase I, sync for cross-ref operation. */
5052                 spin_lock(&lexp->exp_lock);
5053                 lexp->exp_keep_sync = 1;
5054                 spin_unlock(&lexp->exp_lock);
5055         }
5056 out:
5057         if (rc != 0) {
5058                 class_disconnect(lexp);
5059                 *exp = NULL;
5060         } else {
5061                 *exp = lexp;
5062         }
5063
5064         RETURN(rc);
5065 }
5066
5067 static int mdt_obd_reconnect(const struct lu_env *env,
5068                              struct obd_export *exp, struct obd_device *obd,
5069                              struct obd_uuid *cluuid,
5070                              struct obd_connect_data *data,
5071                              void *localdata)
5072 {
5073         lnet_nid_t             *client_nid = localdata;
5074         int                     rc;
5075         ENTRY;
5076
5077         if (exp == NULL || obd == NULL || cluuid == NULL)
5078                 RETURN(-EINVAL);
5079
5080         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5081         if (rc == 0) {
5082                 rc = nodemap_add_member(*client_nid, exp);
5083                 if (rc == 0 || rc == -EEXIST)
5084                         mdt_export_stats_init(obd, exp, localdata);
5085         }
5086
5087         RETURN(rc);
5088 }
5089
5090 /* FIXME: Can we avoid using these two interfaces? */
5091 static int mdt_init_export(struct obd_export *exp)
5092 {
5093         struct mdt_export_data *med = &exp->exp_mdt_data;
5094         int                     rc;
5095         ENTRY;
5096
5097         INIT_LIST_HEAD(&med->med_open_head);
5098         spin_lock_init(&med->med_open_lock);
5099         mutex_init(&med->med_idmap_mutex);
5100         med->med_idmap = NULL;
5101         spin_lock(&exp->exp_lock);
5102         exp->exp_connecting = 1;
5103         spin_unlock(&exp->exp_lock);
5104
5105         /* self-export doesn't need client data and ldlm initialization */
5106         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5107                                      &exp->exp_client_uuid)))
5108                 RETURN(0);
5109
5110         rc = tgt_client_alloc(exp);
5111         if (rc)
5112                 GOTO(err, rc);
5113
5114         rc = ldlm_init_export(exp);
5115         if (rc)
5116                 GOTO(err_free, rc);
5117
5118         RETURN(rc);
5119
5120 err_free:
5121         tgt_client_free(exp);
5122 err:
5123         CERROR("%s: Failed to initialize export: rc = %d\n",
5124                exp->exp_obd->obd_name, rc);
5125         return rc;
5126 }
5127
5128 static int mdt_destroy_export(struct obd_export *exp)
5129 {
5130         ENTRY;
5131
5132         if (exp_connect_rmtclient(exp))
5133                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5134
5135         target_destroy_export(exp);
5136         /* destroy can be called from failed obd_setup, so
5137          * checking uuid is safer than obd_self_export */
5138         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5139                                      &exp->exp_client_uuid)))
5140                 RETURN(0);
5141
5142         ldlm_destroy_export(exp);
5143         tgt_client_free(exp);
5144
5145         LASSERT(list_empty(&exp->exp_outstanding_replies));
5146         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5147
5148         RETURN(0);
5149 }
5150
5151 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5152                    struct linkea_data *ldata)
5153 {
5154         int rc;
5155
5156         LASSERT(ldata->ld_buf->lb_buf != NULL);
5157
5158         if (!mdt_object_exists(mdt_obj))
5159                 return -ENODATA;
5160
5161         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5162                           ldata->ld_buf, XATTR_NAME_LINK);
5163         if (rc == -ERANGE) {
5164                 /* Buf was too small, figure out what we need. */
5165                 lu_buf_free(ldata->ld_buf);
5166                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5167                                   ldata->ld_buf, XATTR_NAME_LINK);
5168                 if (rc < 0)
5169                         return rc;
5170                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5171                 if (ldata->ld_buf->lb_buf == NULL)
5172                         return -ENOMEM;
5173                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5174                                   ldata->ld_buf, XATTR_NAME_LINK);
5175         }
5176         if (rc < 0)
5177                 return rc;
5178
5179         return linkea_init(ldata);
5180 }
5181
5182 /**
5183  * Given an MDT object, try to look up the full path to the object.
5184  * Part of the MDT layer implementation of lfs fid2path.
5185  *
5186  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5187  * \param[in]     obj   Object to do path lookup of
5188  * \param[in,out] fp    User-provided struct to store path information
5189  *
5190  * \retval 0 Lookup successful, path information stored in fp
5191  * \retval -EAGAIN Lookup failed, usually because object is being moved
5192  * \retval negative errno if there was a problem
5193  */
5194 static int mdt_path_current(struct mdt_thread_info *info,
5195                             struct mdt_object *obj,
5196                             struct getinfo_fid2path *fp)
5197 {
5198         struct mdt_device       *mdt = info->mti_mdt;
5199         struct mdt_object       *mdt_obj;
5200         struct link_ea_header   *leh;
5201         struct link_ea_entry    *lee;
5202         struct lu_name          *tmpname = &info->mti_name;
5203         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5204         struct lu_buf           *buf = &info->mti_big_buf;
5205         char                    *ptr;
5206         int                     reclen;
5207         struct linkea_data      ldata = { NULL };
5208         int                     rc = 0;
5209         bool                    first = true;
5210         ENTRY;
5211
5212         /* temp buffer for path element, the buffer will be finally freed
5213          * in mdt_thread_info_fini */
5214         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5215         if (buf->lb_buf == NULL)
5216                 RETURN(-ENOMEM);
5217
5218         ldata.ld_buf = buf;
5219         ptr = fp->gf_path + fp->gf_pathlen - 1;
5220         *ptr = 0;
5221         --ptr;
5222         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5223
5224         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5225          * so checking root_fid can only happen on MDT0. */
5226         while (!lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid)) {
5227                 struct lu_buf           lmv_buf;
5228
5229                 mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5230                 if (IS_ERR(mdt_obj))
5231                         GOTO(out, rc = PTR_ERR(mdt_obj));
5232
5233                 if (!mdt_object_exists(mdt_obj)) {
5234                         mdt_object_put(info->mti_env, mdt_obj);
5235                         GOTO(out, rc = -ENOENT);
5236                 }
5237
5238                 if (mdt_object_remote(mdt_obj)) {
5239                         mdt_object_put(info->mti_env, mdt_obj);
5240                         GOTO(remote_out, rc = -EREMOTE);
5241                 }
5242
5243                 rc = mdt_links_read(info, mdt_obj, &ldata);
5244                 if (rc != 0) {
5245                         mdt_object_put(info->mti_env, mdt_obj);
5246                         GOTO(out, rc);
5247                 }
5248
5249                 leh = buf->lb_buf;
5250                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5251                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5252                 /* If set, use link #linkno for path lookup, otherwise use
5253                    link #0.  Only do this for the final path element. */
5254                 if (first && fp->gf_linkno < leh->leh_reccount) {
5255                         int count;
5256                         for (count = 0; count < fp->gf_linkno; count++) {
5257                                 lee = (struct link_ea_entry *)
5258                                      ((char *)lee + reclen);
5259                                 linkea_entry_unpack(lee, &reclen, tmpname,
5260                                                     tmpfid);
5261                         }
5262                         if (fp->gf_linkno < leh->leh_reccount - 1)
5263                                 /* indicate to user there are more links */
5264                                 fp->gf_linkno++;
5265                 }
5266
5267                 lmv_buf.lb_buf = info->mti_xattr_buf;
5268                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5269                 /* Check if it is slave stripes */
5270                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5271                                   &lmv_buf, XATTR_NAME_LMV);
5272                 mdt_object_put(info->mti_env, mdt_obj);
5273                 if (rc > 0) {
5274                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5275
5276                         /* For slave stripes, get its master */
5277                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5278                                 fp->gf_fid = *tmpfid;
5279                                 continue;
5280                         }
5281                 } else if (rc < 0 && rc != -ENODATA) {
5282                         GOTO(out, rc);
5283                 }
5284
5285                 rc = 0;
5286
5287                 /* Pack the name in the end of the buffer */
5288                 ptr -= tmpname->ln_namelen;
5289                 if (ptr - 1 <= fp->gf_path)
5290                         GOTO(out, rc = -EOVERFLOW);
5291                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5292                 *(--ptr) = '/';
5293
5294                 /* keep the last resolved fid to the client, so the
5295                  * client will build the left path on another MDT for
5296                  * remote object */
5297                 fp->gf_fid = *tmpfid;
5298
5299                 first = false;
5300         }
5301
5302 remote_out:
5303         ptr++; /* skip leading / */
5304         memmove(fp->gf_path, ptr, fp->gf_path + fp->gf_pathlen - ptr);
5305
5306 out:
5307         RETURN(rc);
5308 }
5309
5310 /**
5311  * Given an MDT object, use mdt_path_current to get the path.
5312  * Essentially a wrapper to retry mdt_path_current a set number of times
5313  * if -EAGAIN is returned (usually because an object is being moved).
5314  *
5315  * Part of the MDT layer implementation of lfs fid2path.
5316  *
5317  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5318  * \param[in]     obj   Object to do path lookup of
5319  * \param[in,out] fp    User-provided struct for arguments and to store path
5320  *                      information
5321  *
5322  * \retval 0 Lookup successful, path information stored in fp
5323  * \retval negative errno if there was a problem
5324  */
5325 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5326                     struct getinfo_fid2path *fp)
5327 {
5328         struct mdt_device       *mdt = info->mti_mdt;
5329         int                     tries = 3;
5330         int                     rc = -EAGAIN;
5331         ENTRY;
5332
5333         if (fp->gf_pathlen < 3)
5334                 RETURN(-EOVERFLOW);
5335
5336         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5337                 fp->gf_path[0] = '\0';
5338                 RETURN(0);
5339         }
5340
5341         /* Retry multiple times in case file is being moved */
5342         while (tries-- && rc == -EAGAIN)
5343                 rc = mdt_path_current(info, obj, fp);
5344
5345         RETURN(rc);
5346 }
5347
5348 /**
5349  * Get the full path of the provided FID, as of changelog record recno.
5350  *
5351  * This checks sanity and looks up object for user provided FID
5352  * before calling the actual path lookup code.
5353  *
5354  * Part of the MDT layer implementation of lfs fid2path.
5355  *
5356  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5357  * \param[in,out] fp    User-provided struct for arguments and to store path
5358  *                      information
5359  *
5360  * \retval 0 Lookup successful, path information and recno stored in fp
5361  * \retval -ENOENT, object does not exist
5362  * \retval negative errno if there was a problem
5363  */
5364 static int mdt_fid2path(struct mdt_thread_info *info,
5365                         struct getinfo_fid2path *fp)
5366 {
5367         struct mdt_device *mdt = info->mti_mdt;
5368         struct mdt_object *obj;
5369         int    rc;
5370         ENTRY;
5371
5372         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5373                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5374
5375         if (!fid_is_sane(&fp->gf_fid))
5376                 RETURN(-EINVAL);
5377
5378         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5379                 CWARN("%s: "DFID" is invalid, sequence should be "
5380                       ">= "LPX64"\n", mdt_obd_name(mdt),
5381                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5382                 RETURN(-EINVAL);
5383         }
5384
5385         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5386         if (IS_ERR(obj)) {
5387                 rc = PTR_ERR(obj);
5388                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5389                        PFID(&fp->gf_fid), rc);
5390                 RETURN(rc);
5391         }
5392
5393         if (mdt_object_remote(obj))
5394                 rc = -EREMOTE;
5395         else if (!mdt_object_exists(obj))
5396                 rc = -ENOENT;
5397         else
5398                 rc = 0;
5399
5400         if (rc < 0) {
5401                 mdt_object_put(info->mti_env, obj);
5402                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5403                        PFID(&fp->gf_fid), rc);
5404                 RETURN(rc);
5405         }
5406
5407         rc = mdt_path(info, obj, fp);
5408
5409         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5410                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5411
5412         mdt_object_put(info->mti_env, obj);
5413
5414         RETURN(rc);
5415 }
5416
5417 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5418                             void *val, int vallen)
5419 {
5420         struct getinfo_fid2path *fpout, *fpin;
5421         int rc = 0;
5422
5423         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5424         fpout = val;
5425
5426         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5427                 lustre_swab_fid2path(fpin);
5428
5429         memcpy(fpout, fpin, sizeof(*fpin));
5430         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5431                 RETURN(-EINVAL);
5432
5433         rc = mdt_fid2path(info, fpout);
5434         RETURN(rc);
5435 }
5436
5437 int mdt_get_info(struct tgt_session_info *tsi)
5438 {
5439         char    *key;
5440         int      keylen;
5441         __u32   *vallen;
5442         void    *valout;
5443         int      rc;
5444
5445         ENTRY;
5446
5447         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5448         if (key == NULL) {
5449                 CDEBUG(D_IOCTL, "No GETINFO key\n");
5450                 RETURN(err_serious(-EFAULT));
5451         }
5452         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5453                                       RCL_CLIENT);
5454
5455         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5456         if (vallen == NULL) {
5457                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
5458                                 tgt_name(tsi->tsi_tgt));
5459                 RETURN(err_serious(-EFAULT));
5460         }
5461
5462         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5463                              *vallen);
5464         rc = req_capsule_server_pack(tsi->tsi_pill);
5465         if (rc)
5466                 RETURN(err_serious(rc));
5467
5468         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5469         if (valout == NULL) {
5470                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
5471                                 tgt_name(tsi->tsi_tgt));
5472                 RETURN(err_serious(-EFAULT));
5473         }
5474
5475         if (KEY_IS(KEY_FID2PATH)) {
5476                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5477
5478                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5479                 mdt_thread_info_fini(info);
5480         } else {
5481                 rc = -EINVAL;
5482         }
5483         RETURN(rc);
5484 }
5485
5486 /* Pass the ioc down */
5487 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5488                          unsigned int cmd, int len, void *data)
5489 {
5490         struct lu_context ioctl_session;
5491         struct md_device *next = mdt->mdt_child;
5492         int rc;
5493         ENTRY;
5494
5495         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5496         if (rc)
5497                 RETURN(rc);
5498         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5499         lu_context_enter(&ioctl_session);
5500         env->le_ses = &ioctl_session;
5501
5502         LASSERT(next->md_ops->mdo_iocontrol);
5503         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5504
5505         lu_context_exit(&ioctl_session);
5506         lu_context_fini(&ioctl_session);
5507         RETURN(rc);
5508 }
5509
5510 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5511 {
5512         struct obd_ioctl_data *data = karg;
5513         struct lu_fid *fid;
5514         __u64 version;
5515         struct mdt_object *obj;
5516         struct mdt_lock_handle  *lh;
5517         int rc;
5518         ENTRY;
5519
5520         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5521             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5522                 RETURN(-EINVAL);
5523
5524         fid = (struct lu_fid *)data->ioc_inlbuf1;
5525
5526         if (!fid_is_sane(fid))
5527                 RETURN(-EINVAL);
5528
5529         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5530
5531         lh = &mti->mti_lh[MDT_LH_PARENT];
5532         mdt_lock_reg_init(lh, LCK_CR);
5533
5534         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5535         if (IS_ERR(obj))
5536                 RETURN(PTR_ERR(obj));
5537
5538         if (mdt_object_remote(obj)) {
5539                 rc = -EREMOTE;
5540                 /**
5541                  * before calling version get the correct MDS should be
5542                  * fid, this is error to find remote object here
5543                  */
5544                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5545         } else if (!mdt_object_exists(obj)) {
5546                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5547                 rc = -ENOENT;
5548         } else {
5549                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5550                *(__u64 *)data->ioc_inlbuf2 = version;
5551                 rc = 0;
5552         }
5553         mdt_object_unlock_put(mti, obj, lh, 1);
5554         RETURN(rc);
5555 }
5556
5557 /* ioctls on obd dev */
5558 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5559                          void *karg, void *uarg)
5560 {
5561         struct lu_env      env;
5562         struct obd_device *obd = exp->exp_obd;
5563         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5564         struct dt_device  *dt = mdt->mdt_bottom;
5565         int rc;
5566
5567         ENTRY;
5568         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5569         rc = lu_env_init(&env, LCT_MD_THREAD);
5570         if (rc)
5571                 RETURN(rc);
5572
5573         switch (cmd) {
5574         case OBD_IOC_SYNC:
5575                 rc = mdt_device_sync(&env, mdt);
5576                 break;
5577         case OBD_IOC_SET_READONLY:
5578                 rc = dt->dd_ops->dt_ro(&env, dt);
5579                 break;
5580         case OBD_IOC_ABORT_RECOVERY:
5581                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5582                 target_stop_recovery_thread(obd);
5583                 rc = 0;
5584                 break;
5585         case OBD_IOC_CHANGELOG_REG:
5586         case OBD_IOC_CHANGELOG_DEREG:
5587         case OBD_IOC_CHANGELOG_CLEAR:
5588                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5589                 break;
5590         case OBD_IOC_START_LFSCK: {
5591                 struct md_device *next = mdt->mdt_child;
5592                 struct obd_ioctl_data *data = karg;
5593                 struct lfsck_start_param lsp;
5594
5595                 if (unlikely(data == NULL)) {
5596                         rc = -EINVAL;
5597                         break;
5598                 }
5599
5600                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5601                 lsp.lsp_index_valid = 0;
5602                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5603                 break;
5604         }
5605         case OBD_IOC_STOP_LFSCK: {
5606                 struct md_device        *next = mdt->mdt_child;
5607                 struct obd_ioctl_data   *data = karg;
5608                 struct lfsck_stop        stop;
5609
5610                 stop.ls_status = LS_STOPPED;
5611                 /* Old lfsck utils may pass NULL @stop. */
5612                 if (data->ioc_inlbuf1 == NULL)
5613                         stop.ls_flags = 0;
5614                 else
5615                         stop.ls_flags =
5616                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5617
5618                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5619                 break;
5620         }
5621         case OBD_IOC_GET_OBJ_VERSION: {
5622                 struct mdt_thread_info *mti;
5623                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5624                 memset(mti, 0, sizeof *mti);
5625                 mti->mti_env = &env;
5626                 mti->mti_mdt = mdt;
5627                 mti->mti_exp = exp;
5628
5629                 rc = mdt_ioc_version_get(mti, karg);
5630                 break;
5631         }
5632         case OBD_IOC_CATLOGLIST: {
5633                 struct mdt_thread_info *mti;
5634
5635                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5636                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5637                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5638                                        &mti->mti_tmp_fid1);
5639                 break;
5640          }
5641         default:
5642                 rc = -EOPNOTSUPP;
5643                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5644                         mdt_obd_name(mdt), cmd, rc);
5645         }
5646
5647         lu_env_fini(&env);
5648         RETURN(rc);
5649 }
5650
5651 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5652 {
5653         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5654         struct lfsck_start_param lsp;
5655         int rc;
5656         ENTRY;
5657
5658         lsp.lsp_start = NULL;
5659         lsp.lsp_index_valid = 0;
5660         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
5661                                                    OBD_IOC_START_LFSCK,
5662                                                    0, &lsp);
5663         if (rc != 0 && rc != -EALREADY)
5664                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
5665                       mdt_obd_name(mdt), rc);
5666
5667         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5668         RETURN(rc);
5669 }
5670
5671 static int mdt_obd_postrecov(struct obd_device *obd)
5672 {
5673         struct lu_env env;
5674         int rc;
5675
5676         rc = lu_env_init(&env, LCT_MD_THREAD);
5677         if (rc)
5678                 RETURN(rc);
5679         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5680         lu_env_fini(&env);
5681         return rc;
5682 }
5683
5684 static struct obd_ops mdt_obd_device_ops = {
5685         .o_owner          = THIS_MODULE,
5686         .o_set_info_async = mdt_obd_set_info_async,
5687         .o_connect        = mdt_obd_connect,
5688         .o_reconnect      = mdt_obd_reconnect,
5689         .o_disconnect     = mdt_obd_disconnect,
5690         .o_init_export    = mdt_init_export,
5691         .o_destroy_export = mdt_destroy_export,
5692         .o_iocontrol      = mdt_iocontrol,
5693         .o_postrecov      = mdt_obd_postrecov,
5694 };
5695
5696 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5697                                          struct lu_device *d)
5698 {
5699         struct mdt_device *m = mdt_dev(d);
5700         ENTRY;
5701
5702         mdt_fini(env, m);
5703         RETURN(NULL);
5704 }
5705
5706 static struct lu_device *mdt_device_free(const struct lu_env *env,
5707                                          struct lu_device *d)
5708 {
5709         struct mdt_device *m = mdt_dev(d);
5710         ENTRY;
5711
5712         lu_device_fini(&m->mdt_lu_dev);
5713         OBD_FREE_PTR(m);
5714
5715         RETURN(NULL);
5716 }
5717
5718 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5719                                           struct lu_device_type *t,
5720                                           struct lustre_cfg *cfg)
5721 {
5722         struct lu_device  *l;
5723         struct mdt_device *m;
5724
5725         OBD_ALLOC_PTR(m);
5726         if (m != NULL) {
5727                 int rc;
5728
5729                 l = &m->mdt_lu_dev;
5730                 rc = mdt_init0(env, m, t, cfg);
5731                 if (rc != 0) {
5732                         mdt_device_free(env, l);
5733                         l = ERR_PTR(rc);
5734                         return l;
5735                 }
5736         } else
5737                 l = ERR_PTR(-ENOMEM);
5738         return l;
5739 }
5740
5741 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5742 LU_KEY_INIT(mdt, struct mdt_thread_info);
5743
5744 static void mdt_key_fini(const struct lu_context *ctx,
5745                          struct lu_context_key *key, void* data)
5746 {
5747         struct mdt_thread_info *info = data;
5748
5749         if (info->mti_big_lmm) {
5750                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5751                 info->mti_big_lmm = NULL;
5752                 info->mti_big_lmmsize = 0;
5753         }
5754         OBD_FREE_PTR(info);
5755 }
5756
5757 /* context key: mdt_thread_key */
5758 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5759
5760 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5761 {
5762         return lu_ucred(info->mti_env);
5763 }
5764
5765 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5766 {
5767         return lu_ucred_check(info->mti_env);
5768 }
5769
5770 /**
5771  * Enable/disable COS (Commit On Sharing).
5772  *
5773  * Set/Clear the COS flag in mdt options.
5774  *
5775  * \param mdt mdt device
5776  * \param val 0 disables COS, other values enable COS
5777  */
5778 void mdt_enable_cos(struct mdt_device *mdt, int val)
5779 {
5780         struct lu_env env;
5781         int rc;
5782
5783         mdt->mdt_opts.mo_cos = !!val;
5784         rc = lu_env_init(&env, LCT_LOCAL);
5785         if (unlikely(rc != 0)) {
5786                 CWARN("%s: lu_env initialization failed, cannot "
5787                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
5788                 return;
5789         }
5790         mdt_device_sync(&env, mdt);
5791         lu_env_fini(&env);
5792 }
5793
5794 /**
5795  * Check COS (Commit On Sharing) status.
5796  *
5797  * Return COS flag status.
5798  *
5799  * \param mdt mdt device
5800  */
5801 int mdt_cos_is_enabled(struct mdt_device *mdt)
5802 {
5803         return mdt->mdt_opts.mo_cos != 0;
5804 }
5805
5806 static struct lu_device_type_operations mdt_device_type_ops = {
5807         .ldto_device_alloc = mdt_device_alloc,
5808         .ldto_device_free  = mdt_device_free,
5809         .ldto_device_fini  = mdt_device_fini
5810 };
5811
5812 static struct lu_device_type mdt_device_type = {
5813         .ldt_tags     = LU_DEVICE_MD,
5814         .ldt_name     = LUSTRE_MDT_NAME,
5815         .ldt_ops      = &mdt_device_type_ops,
5816         .ldt_ctx_tags = LCT_MD_THREAD
5817 };
5818
5819 static int __init mdt_mod_init(void)
5820 {
5821         int rc;
5822
5823         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5824                  FID_NOBRACE_LEN + 1);
5825         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5826                  FID_LEN + 1);
5827         rc = lu_kmem_init(mdt_caches);
5828         if (rc)
5829                 return rc;
5830
5831         rc = mds_mod_init();
5832         if (rc)
5833                 GOTO(lu_fini, rc);
5834
5835         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
5836                                  LUSTRE_MDT_NAME, &mdt_device_type);
5837         if (rc)
5838                 GOTO(mds_fini, rc);
5839 lu_fini:
5840         if (rc)
5841                 lu_kmem_fini(mdt_caches);
5842 mds_fini:
5843         if (rc)
5844                 mds_mod_exit();
5845         return rc;
5846 }
5847
5848 static void __exit mdt_mod_exit(void)
5849 {
5850         class_unregister_type(LUSTRE_MDT_NAME);
5851         mds_mod_exit();
5852         lu_kmem_fini(mdt_caches);
5853 }
5854
5855 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5856 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5857 MODULE_LICENSE("GPL");
5858
5859 cfs_module(mdt, LUSTRE_VERSION_STRING, mdt_mod_init, mdt_mod_exit);