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