lustre/mdt/mdt_handler.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_handler.c
  37  *
  38  * Lustre Metadata Target (mdt) request handler
  39  *
  40  * Author: Peter Braam <braam@clusterfs.com>
  41  * Author: Andreas Dilger <adilger@clusterfs.com>
  42  * Author: Phil Schwan <phil@clusterfs.com>
  43  * Author: Mike Shaver <shaver@clusterfs.com>
  44  * Author: Nikita Danilov <nikita@clusterfs.com>
  45  * Author: Huang Hua <huanghua@clusterfs.com>
  46  * Author: Yury Umanets <umka@clusterfs.com>
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_MDS
  50
  51 #include <linux/module.h>
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  */
  55 #include <obd_support.h>
  56 #include <lustre_ioctl.h>
  57 /* struct ptlrpc_request */
  58 #include <lustre_net.h>
  59 /* struct obd_export */
  60 #include <lustre_export.h>
  61 /* struct obd_device */
  62 #include <obd.h>
  63 /* lu2dt_dev() */
  64 #include <dt_object.h>
  65 #include <lustre_mds.h>
  66 #include <lustre_log.h>
  67 #include "mdt_internal.h"
  68 #include <lustre_acl.h>
  69 #include <lustre_param.h>
  70 #include <lustre_quota.h>
  71 #include <lustre_lfsck.h>
  72 #include <lustre_nodemap.h>
  73
  74 mdl_mode_t mdt_mdl_lock_modes[] = {
  75         [LCK_MINMODE] = MDL_MINMODE,
  76         [LCK_EX]      = MDL_EX,
  77         [LCK_PW]      = MDL_PW,
  78         [LCK_PR]      = MDL_PR,
  79         [LCK_CW]      = MDL_CW,
  80         [LCK_CR]      = MDL_CR,
  81         [LCK_NL]      = MDL_NL,
  82         [LCK_GROUP]   = MDL_GROUP
  83 };
  84
  85 ldlm_mode_t mdt_dlm_lock_modes[] = {
  86         [MDL_MINMODE] = LCK_MINMODE,
  87         [MDL_EX]      = LCK_EX,
  88         [MDL_PW]      = LCK_PW,
  89         [MDL_PR]      = LCK_PR,
  90         [MDL_CW]      = LCK_CW,
  91         [MDL_CR]      = LCK_CR,
  92         [MDL_NL]      = LCK_NL,
  93         [MDL_GROUP]   = LCK_GROUP
  94 };
  95
  96 static struct mdt_device *mdt_dev(struct lu_device *d);
  97 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
  98
  99 static const struct lu_object_operations mdt_obj_ops;
 100
 101 /* Slab for MDT object allocation */
 102 static struct kmem_cache *mdt_object_kmem;
 103
 104 /* For HSM restore handles */
 105 struct kmem_cache *mdt_hsm_cdt_kmem;
 106
 107 /* For HSM request handles */
 108 struct kmem_cache *mdt_hsm_car_kmem;
 109
 110 static struct lu_kmem_descr mdt_caches[] = {
 111         {
 112                 .ckd_cache = &mdt_object_kmem,
 113                 .ckd_name  = "mdt_obj",
 114                 .ckd_size  = sizeof(struct mdt_object)
 115         },
 116         {
 117                 .ckd_cache      = &mdt_hsm_cdt_kmem,
 118                 .ckd_name       = "mdt_cdt_restore_handle",
 119                 .ckd_size       = sizeof(struct cdt_restore_handle)
 120         },
 121         {
 122                 .ckd_cache      = &mdt_hsm_car_kmem,
 123                 .ckd_name       = "mdt_cdt_agent_req",
 124                 .ckd_size       = sizeof(struct cdt_agent_req)
 125         },
 126         {
 127                 .ckd_cache = NULL
 128         }
 129 };
 130
 131 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
 132 {
 133         if (!rep)
 134                 return 0;
 135         return rep->lock_policy_res1 & op_flag;
 136 }
 137
 138 void mdt_clear_disposition(struct mdt_thread_info *info,
 139                            struct ldlm_reply *rep, __u64 op_flag)
 140 {
 141         if (info) {
 142                 info->mti_opdata &= ~op_flag;
 143                 tgt_opdata_clear(info->mti_env, op_flag);
 144         }
 145         if (rep)
 146                 rep->lock_policy_res1 &= ~op_flag;
 147 }
 148
 149 void mdt_set_disposition(struct mdt_thread_info *info,
 150                          struct ldlm_reply *rep, __u64 op_flag)
 151 {
 152         if (info) {
 153                 info->mti_opdata |= op_flag;
 154                 tgt_opdata_set(info->mti_env, op_flag);
 155         }
 156         if (rep)
 157                 rep->lock_policy_res1 |= op_flag;
 158 }
 159
 160 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
 161 {
 162         lh->mlh_pdo_hash = 0;
 163         lh->mlh_reg_mode = lm;
 164         lh->mlh_rreg_mode = lm;
 165         lh->mlh_type = MDT_REG_LOCK;
 166 }
 167
 168 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
 169                        const struct lu_name *lname)
 170 {
 171         lh->mlh_reg_mode = lock_mode;
 172         lh->mlh_rreg_mode = lock_mode;
 173         lh->mlh_type = MDT_PDO_LOCK;
 174
 175         if (lu_name_is_valid(lname)) {
 176                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
 177                                                   lname->ln_namelen);
 178                 /* XXX Workaround for LU-2856
 179                  *
 180                  * Zero is a valid return value of full_name_hash, but
 181                  * several users of mlh_pdo_hash assume a non-zero
 182                  * hash value. We therefore map zero onto an
 183                  * arbitrary, but consistent value (1) to avoid
 184                  * problems further down the road. */
 185                 if (unlikely(lh->mlh_pdo_hash == 0))
 186                         lh->mlh_pdo_hash = 1;
 187         } else {
 188                 lh->mlh_pdo_hash = 0;
 189         }
 190 }
 191
 192 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
 193                               struct mdt_lock_handle *lh)
 194 {
 195         mdl_mode_t mode;
 196         ENTRY;
 197
 198         /*
 199          * Any dir access needs couple of locks:
 200          *
 201          * 1) on part of dir we gonna take lookup/modify;
 202          *
 203          * 2) on whole dir to protect it from concurrent splitting and/or to
 204          * flush client's cache for readdir().
 205          *
 206          * so, for a given mode and object this routine decides what lock mode
 207          * to use for lock #2:
 208          *
 209          * 1) if caller's gonna lookup in dir then we need to protect dir from
 210          * being splitted only - LCK_CR
 211          *
 212          * 2) if caller's gonna modify dir then we need to protect dir from
 213          * being splitted and to flush cache - LCK_CW
 214          *
 215          * 3) if caller's gonna modify dir and that dir seems ready for
 216          * splitting then we need to protect it from any type of access
 217          * (lookup/modify/split) - LCK_EX --bzzz
 218          */
 219
 220         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
 221         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
 222
 223         /*
 224          * Ask underlaying level its opinion about preferable PDO lock mode
 225          * having access type passed as regular lock mode:
 226          *
 227          * - MDL_MINMODE means that lower layer does not want to specify lock
 228          * mode;
 229          *
 230          * - MDL_NL means that no PDO lock should be taken. This is used in some
 231          * cases. Say, for non-splittable directories no need to use PDO locks
 232          * at all.
 233          */
 234         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
 235                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
 236
 237         if (mode != MDL_MINMODE) {
 238                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
 239         } else {
 240                 /*
 241                  * Lower layer does not want to specify locking mode. We do it
 242                  * our selves. No special protection is needed, just flush
 243                  * client's cache on modification and allow concurrent
 244                  * mondification.
 245                  */
 246                 switch (lh->mlh_reg_mode) {
 247                 case LCK_EX:
 248                         lh->mlh_pdo_mode = LCK_EX;
 249                         break;
 250                 case LCK_PR:
 251                         lh->mlh_pdo_mode = LCK_CR;
 252                         break;
 253                 case LCK_PW:
 254                         lh->mlh_pdo_mode = LCK_CW;
 255                         break;
 256                 default:
 257                         CERROR("Not expected lock type (0x%x)\n",
 258                                (int)lh->mlh_reg_mode);
 259                         LBUG();
 260                 }
 261         }
 262
 263         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
 264         EXIT;
 265 }
 266
 267 static int mdt_getstatus(struct tgt_session_info *tsi)
 268 {
 269         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
 270         struct mdt_device       *mdt = info->mti_mdt;
 271         struct mdt_body         *repbody;
 272         int                      rc;
 273
 274         ENTRY;
 275
 276         rc = mdt_check_ucred(info);
 277         if (rc)
 278                 GOTO(out, rc = err_serious(rc));
 279
 280         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
 281                 GOTO(out, rc = err_serious(-ENOMEM));
 282
 283         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 284         repbody->mbo_fid1 = mdt->mdt_md_root_fid;
 285         repbody->mbo_valid |= OBD_MD_FLID;
 286
 287         EXIT;
 288 out:
 289         mdt_thread_info_fini(info);
 290         return rc;
 291 }
 292
 293 static int mdt_statfs(struct tgt_session_info *tsi)
 294 {
 295         struct ptlrpc_request           *req = tgt_ses_req(tsi);
 296         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
 297         struct md_device                *next = info->mti_mdt->mdt_child;
 298         struct ptlrpc_service_part      *svcpt;
 299         struct obd_statfs               *osfs;
 300         int                             rc;
 301
 302         ENTRY;
 303
 304         svcpt = req->rq_rqbd->rqbd_svcpt;
 305
 306         /* This will trigger a watchdog timeout */
 307         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
 308                          (MDT_SERVICE_WATCHDOG_FACTOR *
 309                           at_get(&svcpt->scp_at_estimate)) + 1);
 310
 311         rc = mdt_check_ucred(info);
 312         if (rc)
 313                 GOTO(out, rc = err_serious(rc));
 314
 315         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
 316                 GOTO(out, rc = err_serious(-ENOMEM));
 317
 318         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
 319         if (!osfs)
 320                 GOTO(out, rc = -EPROTO);
 321
 322         /** statfs information are cached in the mdt_device */
 323         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
 324                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
 325                 /** statfs data is too old, get up-to-date one */
 326                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
 327                 if (rc)
 328                         GOTO(out, rc);
 329                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 330                 info->mti_mdt->mdt_osfs = *osfs;
 331                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
 332                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 333         } else {
 334                 /** use cached statfs data */
 335                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
 336                 *osfs = info->mti_mdt->mdt_osfs;
 337                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
 338         }
 339
 340         if (rc == 0)
 341                 mdt_counter_incr(req, LPROC_MDT_STATFS);
 342 out:
 343         mdt_thread_info_fini(info);
 344         RETURN(rc);
 345 }
 346
 347 #ifdef CONFIG_FS_POSIX_ACL
 348 /*
 349  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
 350  *
 351  * \param       info    thread info object
 352  * \param       repbody reply to pack ACLs into
 353  * \param       o       mdt object of file to examine
 354  * \param       nodemap nodemap of client to reply to
 355  * \retval      0       success
 356  * \retval      -errno  error getting or parsing ACL from disk
 357  */
 358 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
 359                       struct mdt_object *o, struct lu_nodemap *nodemap)
 360 {
 361         const struct lu_env     *env = info->mti_env;
 362         struct md_object        *next = mdt_object_child(o);
 363         struct lu_buf           *buf = &info->mti_buf;
 364         int rc;
 365
 366         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
 367         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
 368                                            RCL_SERVER);
 369         if (buf->lb_len == 0)
 370                 return 0;
 371
 372         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
 373         if (rc < 0) {
 374                 if (rc == -ENODATA) {
 375                         repbody->mbo_aclsize = 0;
 376                         repbody->mbo_valid |= OBD_MD_FLACL;
 377                         rc = 0;
 378                 } else if (rc == -EOPNOTSUPP) {
 379                         rc = 0;
 380                 } else {
 381                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
 382                                mdt_obd_name(info->mti_mdt),
 383                                PFID(mdt_object_fid(o)), rc);
 384                 }
 385         } else {
 386                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
 387                                      rc, NODEMAP_FS_TO_CLIENT);
 388                 /* if all ACLs mapped out, rc is still >= 0 */
 389                 if (rc < 0) {
 390                         CERROR("%s: nodemap_map_acl unable to parse "DFID
 391                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
 392                                PFID(mdt_object_fid(o)), rc);
 393                 } else {
 394                         repbody->mbo_aclsize = rc;
 395                         repbody->mbo_valid |= OBD_MD_FLACL;
 396                         rc = 0;
 397                 }
 398         }
 399         return rc;
 400 }
 401 #endif
 402
 403 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
 404                         const struct lu_attr *attr, const struct lu_fid *fid)
 405 {
 406         struct md_attr          *ma = &info->mti_attr;
 407         struct obd_export       *exp = info->mti_exp;
 408         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 409
 410         LASSERT(ma->ma_valid & MA_INODE);
 411
 412         if (attr->la_valid & LA_ATIME) {
 413                 b->mbo_atime = attr->la_atime;
 414                 b->mbo_valid |= OBD_MD_FLATIME;
 415         }
 416         if (attr->la_valid & LA_MTIME) {
 417                 b->mbo_mtime = attr->la_mtime;
 418                 b->mbo_valid |= OBD_MD_FLMTIME;
 419         }
 420         if (attr->la_valid & LA_CTIME) {
 421                 b->mbo_ctime = attr->la_ctime;
 422                 b->mbo_valid |= OBD_MD_FLCTIME;
 423         }
 424         if (attr->la_valid & LA_FLAGS) {
 425                 b->mbo_flags = attr->la_flags;
 426                 b->mbo_valid |= OBD_MD_FLFLAGS;
 427         }
 428         if (attr->la_valid & LA_NLINK) {
 429                 b->mbo_nlink = attr->la_nlink;
 430                 b->mbo_valid |= OBD_MD_FLNLINK;
 431         }
 432         if (attr->la_valid & LA_UID) {
 433                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
 434                                             NODEMAP_FS_TO_CLIENT,
 435                                             attr->la_uid);
 436                 b->mbo_valid |= OBD_MD_FLUID;
 437         }
 438         if (attr->la_valid & LA_GID) {
 439                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
 440                                             NODEMAP_FS_TO_CLIENT,
 441                                             attr->la_gid);
 442                 b->mbo_valid |= OBD_MD_FLGID;
 443         }
 444         b->mbo_mode = attr->la_mode;
 445         if (attr->la_valid & LA_MODE)
 446                 b->mbo_valid |= OBD_MD_FLMODE;
 447         if (attr->la_valid & LA_TYPE)
 448                 b->mbo_valid |= OBD_MD_FLTYPE;
 449
 450         if (fid != NULL) {
 451                 b->mbo_fid1 = *fid;
 452                 b->mbo_valid |= OBD_MD_FLID;
 453                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid="LPX64"\n",
 454                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
 455         }
 456
 457         if (info != NULL)
 458                 mdt_body_reverse_idmap(info, b);
 459
 460         if (!(attr->la_valid & LA_TYPE))
 461                 return;
 462
 463         b->mbo_rdev   = attr->la_rdev;
 464         b->mbo_size   = attr->la_size;
 465         b->mbo_blocks = attr->la_blocks;
 466
 467         if (!S_ISREG(attr->la_mode)) {
 468                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
 469         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
 470                 /* means no objects are allocated on osts. */
 471                 LASSERT(!(ma->ma_valid & MA_LOV));
 472                 /* just ignore blocks occupied by extend attributes on MDS */
 473                 b->mbo_blocks = 0;
 474                 /* if no object is allocated on osts, the size on mds is valid.
 475                  * b=22272 */
 476                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 477         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
 478                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
 479                 /* A released file stores its size on MDS. */
 480                 /* But return 1 block for released file, unless tools like tar
 481                  * will consider it fully sparse. (LU-3864)
 482                  */
 483                 if (unlikely(b->mbo_size == 0))
 484                         b->mbo_blocks = 0;
 485                 else
 486                         b->mbo_blocks = 1;
 487                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 488         }
 489
 490         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
 491                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
 492                        PFID(fid), (unsigned long long)b->mbo_size);
 493 }
 494
 495 static inline int mdt_body_has_lov(const struct lu_attr *la,
 496                                    const struct mdt_body *body)
 497 {
 498         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
 499                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
 500 }
 501
 502 void mdt_client_compatibility(struct mdt_thread_info *info)
 503 {
 504         struct mdt_body       *body;
 505         struct ptlrpc_request *req = mdt_info_req(info);
 506         struct obd_export     *exp = req->rq_export;
 507         struct md_attr        *ma = &info->mti_attr;
 508         struct lu_attr        *la = &ma->ma_attr;
 509         ENTRY;
 510
 511         if (exp_connect_layout(exp))
 512                 /* the client can deal with 16-bit lmm_stripe_count */
 513                 RETURN_EXIT;
 514
 515         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 516
 517         if (!mdt_body_has_lov(la, body))
 518                 RETURN_EXIT;
 519
 520         /* now we have a reply with a lov for a client not compatible with the
 521          * layout lock so we have to clean the layout generation number */
 522         if (S_ISREG(la->la_mode))
 523                 ma->ma_lmm->lmm_layout_gen = 0;
 524         EXIT;
 525 }
 526
 527 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
 528                                    struct mdt_object *o)
 529 {
 530         const struct lu_env *env = info->mti_env;
 531         int rc, rc2;
 532
 533         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 534                           XATTR_NAME_LOV);
 535
 536         if (rc == -ENODATA)
 537                 rc = 0;
 538
 539         if (rc < 0)
 540                 goto out;
 541
 542         /* Is it a directory? Let's check for the LMV as well */
 543         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
 544                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
 545                                    XATTR_NAME_LMV);
 546
 547                 if (rc2 == -ENODATA)
 548                         rc2 = mo_xattr_get(env, mdt_object_child(o),
 549                                            &LU_BUF_NULL,
 550                                            XATTR_NAME_DEFAULT_LMV);
 551
 552                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
 553                         rc = rc2;
 554         }
 555
 556 out:
 557         return rc;
 558 }
 559
 560 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
 561                       const char *name)
 562 {
 563         const struct lu_env *env = info->mti_env;
 564         int rc;
 565         ENTRY;
 566
 567         LASSERT(info->mti_big_lmm_used == 0);
 568         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
 569         if (rc < 0)
 570                 RETURN(rc);
 571
 572         /* big_lmm may need to be grown */
 573         if (info->mti_big_lmmsize < rc) {
 574                 int size = size_roundup_power2(rc);
 575
 576                 if (info->mti_big_lmmsize > 0) {
 577                         /* free old buffer */
 578                         LASSERT(info->mti_big_lmm);
 579                         OBD_FREE_LARGE(info->mti_big_lmm,
 580                                        info->mti_big_lmmsize);
 581                         info->mti_big_lmm = NULL;
 582                         info->mti_big_lmmsize = 0;
 583                 }
 584
 585                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
 586                 if (info->mti_big_lmm == NULL)
 587                         RETURN(-ENOMEM);
 588                 info->mti_big_lmmsize = size;
 589         }
 590         LASSERT(info->mti_big_lmmsize >= rc);
 591
 592         info->mti_buf.lb_buf = info->mti_big_lmm;
 593         info->mti_buf.lb_len = info->mti_big_lmmsize;
 594         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
 595
 596         RETURN(rc);
 597 }
 598
 599 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
 600                    struct md_attr *ma, const char *name)
 601 {
 602         struct md_object *next = mdt_object_child(o);
 603         struct lu_buf    *buf = &info->mti_buf;
 604         int rc;
 605
 606         if (strcmp(name, XATTR_NAME_LOV) == 0) {
 607                 buf->lb_buf = ma->ma_lmm;
 608                 buf->lb_len = ma->ma_lmm_size;
 609                 LASSERT(!(ma->ma_valid & MA_LOV));
 610         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 611                 buf->lb_buf = ma->ma_lmv;
 612                 buf->lb_len = ma->ma_lmv_size;
 613                 LASSERT(!(ma->ma_valid & MA_LMV));
 614         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 615                 buf->lb_buf = ma->ma_lmv;
 616                 buf->lb_len = ma->ma_lmv_size;
 617                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
 618         } else {
 619                 return -EINVAL;
 620         }
 621
 622         rc = mo_xattr_get(info->mti_env, next, buf, name);
 623         if (rc > 0) {
 624
 625 got:
 626                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
 627                         if (info->mti_big_lmm_used)
 628                                 ma->ma_lmm = info->mti_big_lmm;
 629
 630                         /* NOT return LOV EA with hole to old client. */
 631                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
 632                                      LOV_PATTERN_F_HOLE) &&
 633                             !(exp_connect_flags(info->mti_exp) &
 634                               OBD_CONNECT_LFSCK)) {
 635                                 return -EIO;
 636                         } else {
 637                                 ma->ma_lmm_size = rc;
 638                                 ma->ma_valid |= MA_LOV;
 639                         }
 640                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
 641                         if (info->mti_big_lmm_used)
 642                                 ma->ma_lmv = info->mti_big_lmm;
 643
 644                         ma->ma_lmv_size = rc;
 645                         ma->ma_valid |= MA_LMV;
 646                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
 647                         ma->ma_lmv_size = rc;
 648                         ma->ma_valid |= MA_LMV_DEF;
 649                 }
 650
 651                 /* Update mdt_max_mdsize so all clients will be aware that */
 652                 if (info->mti_mdt->mdt_max_mdsize < rc)
 653                         info->mti_mdt->mdt_max_mdsize = rc;
 654
 655                 rc = 0;
 656         } else if (rc == -ENODATA) {
 657                 /* no LOV EA */
 658                 rc = 0;
 659         } else if (rc == -ERANGE) {
 660                 /* Default LMV has fixed size, so it must be able to fit
 661                  * in the original buffer */
 662                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
 663                         return rc;
 664                 rc = mdt_big_xattr_get(info, o, name);
 665                 if (rc > 0) {
 666                         info->mti_big_lmm_used = 1;
 667                         goto got;
 668                 }
 669         }
 670
 671         return rc;
 672 }
 673
 674 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
 675                              struct mdt_object *o, struct lu_fid *pfid)
 676 {
 677         struct lu_buf           *buf = &info->mti_buf;
 678         struct link_ea_header   *leh;
 679         struct link_ea_entry    *lee;
 680         int                      rc;
 681         ENTRY;
 682
 683         buf->lb_buf = info->mti_big_lmm;
 684         buf->lb_len = info->mti_big_lmmsize;
 685         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
 686                           buf, XATTR_NAME_LINK);
 687         /* ignore errors, MA_PFID won't be set and it is
 688          * up to the caller to treat this as an error */
 689         if (rc == -ERANGE || buf->lb_len == 0) {
 690                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
 691                 buf->lb_buf = info->mti_big_lmm;
 692                 buf->lb_len = info->mti_big_lmmsize;
 693         }
 694
 695         if (rc < 0)
 696                 RETURN(rc);
 697         if (rc < sizeof(*leh)) {
 698                 CERROR("short LinkEA on "DFID": rc = %d\n",
 699                        PFID(mdt_object_fid(o)), rc);
 700                 RETURN(-ENODATA);
 701         }
 702
 703         leh = (struct link_ea_header *) buf->lb_buf;
 704         lee = (struct link_ea_entry *)(leh + 1);
 705         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
 706                 leh->leh_magic = LINK_EA_MAGIC;
 707                 leh->leh_reccount = __swab32(leh->leh_reccount);
 708                 leh->leh_len = __swab64(leh->leh_len);
 709         }
 710         if (leh->leh_magic != LINK_EA_MAGIC)
 711                 RETURN(-EINVAL);
 712         if (leh->leh_reccount == 0)
 713                 RETURN(-ENODATA);
 714
 715         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
 716         fid_be_to_cpu(pfid, pfid);
 717
 718         RETURN(0);
 719 }
 720
 721 int mdt_attr_get_complex(struct mdt_thread_info *info,
 722                          struct mdt_object *o, struct md_attr *ma)
 723 {
 724         const struct lu_env *env = info->mti_env;
 725         struct md_object    *next = mdt_object_child(o);
 726         struct lu_buf       *buf = &info->mti_buf;
 727         int                  need = ma->ma_need;
 728         int                  rc = 0, rc2;
 729         u32                  mode;
 730         ENTRY;
 731
 732         ma->ma_valid = 0;
 733
 734         if (mdt_object_exists(o) == 0)
 735                 GOTO(out, rc = -ENOENT);
 736         mode = lu_object_attr(&next->mo_lu);
 737
 738         if (need & MA_INODE) {
 739                 ma->ma_need = MA_INODE;
 740                 rc = mo_attr_get(env, next, ma);
 741                 if (rc)
 742                         GOTO(out, rc);
 743                 ma->ma_valid |= MA_INODE;
 744         }
 745
 746         if (need & MA_PFID) {
 747                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
 748                 if (rc == 0)
 749                         ma->ma_valid |= MA_PFID;
 750                 /* ignore this error, parent fid is not mandatory */
 751                 rc = 0;
 752         }
 753
 754         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
 755                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
 756                 if (rc)
 757                         GOTO(out, rc);
 758         }
 759
 760         if (need & MA_LMV && S_ISDIR(mode)) {
 761                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
 762                 if (rc != 0)
 763                         GOTO(out, rc);
 764         }
 765
 766         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
 767                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
 768                 if (rc != 0)
 769                         GOTO(out, rc);
 770         }
 771
 772         if (need & MA_HSM && S_ISREG(mode)) {
 773                 buf->lb_buf = info->mti_xattr_buf;
 774                 buf->lb_len = sizeof(info->mti_xattr_buf);
 775                 CLASSERT(sizeof(struct hsm_attrs) <=
 776                          sizeof(info->mti_xattr_buf));
 777                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
 778                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
 779                 if (rc2 == 0)
 780                         ma->ma_valid |= MA_HSM;
 781                 else if (rc2 < 0 && rc2 != -ENODATA)
 782                         GOTO(out, rc = rc2);
 783         }
 784
 785 #ifdef CONFIG_FS_POSIX_ACL
 786         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
 787                 buf->lb_buf = ma->ma_acl;
 788                 buf->lb_len = ma->ma_acl_size;
 789                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
 790                 if (rc2 > 0) {
 791                         ma->ma_acl_size = rc2;
 792                         ma->ma_valid |= MA_ACL_DEF;
 793                 } else if (rc2 == -ENODATA) {
 794                         /* no ACLs */
 795                         ma->ma_acl_size = 0;
 796                 } else
 797                         GOTO(out, rc = rc2);
 798         }
 799 #endif
 800 out:
 801         ma->ma_need = need;
 802         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
 803                rc, ma->ma_valid, ma->ma_lmm);
 804         RETURN(rc);
 805 }
 806
 807 static int mdt_getattr_internal(struct mdt_thread_info *info,
 808                                 struct mdt_object *o, int ma_need)
 809 {
 810         struct md_object        *next = mdt_object_child(o);
 811         const struct mdt_body   *reqbody = info->mti_body;
 812         struct ptlrpc_request   *req = mdt_info_req(info);
 813         struct md_attr          *ma = &info->mti_attr;
 814         struct lu_attr          *la = &ma->ma_attr;
 815         struct req_capsule      *pill = info->mti_pill;
 816         const struct lu_env     *env = info->mti_env;
 817         struct mdt_body         *repbody;
 818         struct lu_buf           *buffer = &info->mti_buf;
 819         struct obd_export       *exp = info->mti_exp;
 820         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
 821         int                      rc;
 822         int                      is_root;
 823         ENTRY;
 824
 825         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
 826                 RETURN(err_serious(-ENOMEM));
 827
 828         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
 829
 830         ma->ma_valid = 0;
 831
 832         if (mdt_object_remote(o)) {
 833                 /* This object is located on remote node.*/
 834                 /* Return -ENOTSUPP for old client */
 835                 if (!mdt_is_dne_client(req->rq_export))
 836                         GOTO(out, rc = -ENOTSUPP);
 837
 838                 repbody->mbo_fid1 = *mdt_object_fid(o);
 839                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
 840                 GOTO(out, rc = 0);
 841         }
 842
 843         if (reqbody->mbo_eadatasize > 0) {
 844                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
 845                 if (buffer->lb_buf == NULL)
 846                         GOTO(out, rc = -EPROTO);
 847                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
 848                                                       RCL_SERVER);
 849         } else {
 850                 buffer->lb_buf = NULL;
 851                 buffer->lb_len = 0;
 852                 ma_need &= ~(MA_LOV | MA_LMV);
 853                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
 854                        mdt_obd_name(info->mti_mdt),
 855                        req->rq_export->exp_client_uuid.uuid);
 856         }
 857
 858         /* If it is dir object and client require MEA, then we got MEA */
 859         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 860             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
 861                 /* Assumption: MDT_MD size is enough for lmv size. */
 862                 ma->ma_lmv = buffer->lb_buf;
 863                 ma->ma_lmv_size = buffer->lb_len;
 864                 ma->ma_need = MA_INODE;
 865                 if (ma->ma_lmv_size > 0) {
 866                         if (reqbody->mbo_valid & OBD_MD_MEA)
 867                                 ma->ma_need |= MA_LMV;
 868                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
 869                                 ma->ma_need |= MA_LMV_DEF;
 870                 }
 871         } else {
 872                 ma->ma_lmm = buffer->lb_buf;
 873                 ma->ma_lmm_size = buffer->lb_len;
 874                 ma->ma_need = MA_INODE | MA_HSM;
 875                 if (ma->ma_lmm_size > 0)
 876                         ma->ma_need |= MA_LOV;
 877         }
 878
 879         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
 880             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
 881             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
 882                 /* get default stripe info for this dir. */
 883                 ma->ma_need |= MA_LOV_DEF;
 884         }
 885         ma->ma_need |= ma_need;
 886
 887         rc = mdt_attr_get_complex(info, o, ma);
 888         if (unlikely(rc)) {
 889                 CERROR("%s: getattr error for "DFID": rc = %d\n",
 890                        mdt_obd_name(info->mti_mdt),
 891                        PFID(mdt_object_fid(o)), rc);
 892                 RETURN(rc);
 893         }
 894
 895         /* if file is released, check if a restore is running */
 896         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
 897             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
 898                 repbody->mbo_t_state = MS_RESTORE;
 899                 repbody->mbo_valid |= OBD_MD_TSTATE;
 900         }
 901
 902         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 903
 904         /* the Lustre protocol supposes to return default striping
 905          * on the user-visible root if explicitly requested */
 906         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
 907             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
 908                 struct lu_fid      rootfid;
 909                 struct mdt_object *root;
 910                 struct mdt_device *mdt = info->mti_mdt;
 911
 912                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
 913                 if (rc)
 914                         RETURN(rc);
 915                 root = mdt_object_find(env, mdt, &rootfid);
 916                 if (IS_ERR(root))
 917                         RETURN(PTR_ERR(root));
 918                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
 919                 mdt_object_put(info->mti_env, root);
 920                 if (unlikely(rc)) {
 921                         CERROR("%s: getattr error for "DFID": rc = %d\n",
 922                                mdt_obd_name(info->mti_mdt),
 923                                PFID(mdt_object_fid(o)), rc);
 924                         RETURN(rc);
 925                 }
 926         }
 927
 928         if (likely(ma->ma_valid & MA_INODE))
 929                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
 930         else
 931                 RETURN(-EFAULT);
 932
 933         if (mdt_body_has_lov(la, reqbody)) {
 934                 if (ma->ma_valid & MA_LOV) {
 935                         LASSERT(ma->ma_lmm_size);
 936                         repbody->mbo_eadatasize = ma->ma_lmm_size;
 937                         if (S_ISDIR(la->la_mode))
 938                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
 939                         else
 940                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
 941                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
 942                 }
 943                 if (ma->ma_valid & MA_LMV) {
 944                         /* Return -ENOTSUPP for old client */
 945                         if (!mdt_is_striped_client(req->rq_export))
 946                                 RETURN(-ENOTSUPP);
 947
 948                         LASSERT(S_ISDIR(la->la_mode));
 949                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
 950                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 951                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
 952                 }
 953                 if (ma->ma_valid & MA_LMV_DEF) {
 954                         /* Return -ENOTSUPP for old client */
 955                         if (!mdt_is_striped_client(req->rq_export))
 956                                 RETURN(-ENOTSUPP);
 957                         LASSERT(S_ISDIR(la->la_mode));
 958                         repbody->mbo_eadatasize = ma->ma_lmv_size;
 959                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
 960                                                OBD_MD_DEFAULT_MEA);
 961                 }
 962         } else if (S_ISLNK(la->la_mode) &&
 963                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
 964                 buffer->lb_buf = ma->ma_lmm;
 965                 /* eadatasize from client includes NULL-terminator, so
 966                  * there is no need to read it */
 967                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
 968                 rc = mo_readlink(env, next, buffer);
 969                 if (unlikely(rc <= 0)) {
 970                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
 971                                mdt_obd_name(info->mti_mdt),
 972                                PFID(mdt_object_fid(o)), rc);
 973                         rc = -EFAULT;
 974                 } else {
 975                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 976
 977                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
 978                                 rc -= 2;
 979                         repbody->mbo_valid |= OBD_MD_LINKNAME;
 980                         /* we need to report back size with NULL-terminator
 981                          * because client expects that */
 982                         repbody->mbo_eadatasize = rc + 1;
 983                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
 984                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
 985                                        "on "DFID ", expected %d\n",
 986                                        mdt_obd_name(info->mti_mdt),
 987                                        rc, PFID(mdt_object_fid(o)),
 988                                        reqbody->mbo_eadatasize - 1);
 989                         /* NULL terminate */
 990                         ((char *)ma->ma_lmm)[rc] = 0;
 991
 992                         /* If the total CDEBUG() size is larger than a page, it
 993                          * will print a warning to the console, avoid this by
 994                          * printing just the last part of the symlink. */
 995                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
 996                                print_limit < rc ? "..." : "", print_limit,
 997                                (char *)ma->ma_lmm + rc - print_limit, rc);
 998                         rc = 0;
 999                 }
1000         }
1001
1002         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1003                 repbody->mbo_max_cookiesize = 0;
1004                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1005                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1006                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
1007                        "MAX_COOKIE to : %d:%d\n", repbody->mbo_max_mdsize,
1008                        repbody->mbo_max_cookiesize);
1009         }
1010
1011         if (exp_connect_rmtclient(info->mti_exp) &&
1012             reqbody->mbo_valid & OBD_MD_FLRMTPERM) {
1013                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
1014
1015                 /* mdt_getattr_lock only */
1016                 rc = mdt_pack_remote_perm(info, o, buf);
1017                 if (rc) {
1018                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
1019                         repbody->mbo_aclsize = 0;
1020                         RETURN(rc);
1021                 } else {
1022                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
1023                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
1024                 }
1025         }
1026 #ifdef CONFIG_FS_POSIX_ACL
1027         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1028                  (reqbody->mbo_valid & OBD_MD_FLACL))
1029                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1030 #endif
1031
1032 out:
1033         if (rc == 0)
1034                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1035
1036         RETURN(rc);
1037 }
1038
1039 static int mdt_getattr(struct tgt_session_info *tsi)
1040 {
1041         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1042         struct mdt_object       *obj = info->mti_object;
1043         struct req_capsule      *pill = info->mti_pill;
1044         struct mdt_body         *reqbody;
1045         struct mdt_body         *repbody;
1046         int rc, rc2;
1047         ENTRY;
1048
1049         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1050         LASSERT(reqbody);
1051         LASSERT(obj != NULL);
1052         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1053
1054         /* Unlike intent case where we need to pre-fill out buffers early on
1055          * in intent policy for ldlm reasons, here we can have a much better
1056          * guess at EA size by just reading it from disk.
1057          * Exceptions are readdir and (missing) directory striping */
1058         /* Readlink */
1059         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1060                 /* No easy way to know how long is the symlink, but it cannot
1061                  * be more than PATH_MAX, so we allocate +1 */
1062                 rc = PATH_MAX + 1;
1063
1064         /* A special case for fs ROOT: getattr there might fetch
1065          * default EA for entire fs, not just for this dir!
1066          */
1067         } else if (lu_fid_eq(mdt_object_fid(obj),
1068                              &info->mti_mdt->mdt_md_root_fid) &&
1069                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1070                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1071                                                                  MDS_GETATTR)) {
1072                 /* Should the default strping be bigger, mdt_fix_reply
1073                  * will reallocate */
1074                 rc = DEF_REP_MD_SIZE;
1075         } else {
1076                 /* Read the actual EA size from disk */
1077                 rc = mdt_attr_get_eabuf_size(info, obj);
1078         }
1079
1080         if (rc < 0)
1081                 GOTO(out, rc = err_serious(rc));
1082
1083         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1084
1085         rc = req_capsule_server_pack(pill);
1086         if (unlikely(rc != 0))
1087                 GOTO(out, rc = err_serious(rc));
1088
1089         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1090         LASSERT(repbody != NULL);
1091         repbody->mbo_eadatasize = 0;
1092         repbody->mbo_aclsize = 0;
1093
1094         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1095                 rc = mdt_init_ucred(info, reqbody);
1096         else
1097                 rc = mdt_check_ucred(info);
1098         if (unlikely(rc))
1099                 GOTO(out_shrink, rc);
1100
1101         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1102
1103         rc = mdt_getattr_internal(info, obj, 0);
1104         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1105                 mdt_exit_ucred(info);
1106         EXIT;
1107 out_shrink:
1108         mdt_client_compatibility(info);
1109         rc2 = mdt_fix_reply(info);
1110         if (rc == 0)
1111                 rc = rc2;
1112 out:
1113         mdt_thread_info_fini(info);
1114         return rc;
1115 }
1116
1117 /**
1118  * Exchange MOF_LOV_CREATED flags between two objects after a
1119  * layout swap. No assumption is made on whether o1 or o2 have
1120  * created objects or not.
1121  *
1122  * \param[in,out] o1    First swap layout object
1123  * \param[in,out] o2    Second swap layout object
1124  */
1125 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1126 {
1127         __u64   o1_flags;
1128
1129         mutex_lock(&o1->mot_lov_mutex);
1130         mutex_lock(&o2->mot_lov_mutex);
1131
1132         o1_flags = o1->mot_flags;
1133         o1->mot_flags = (o1->mot_flags & ~MOF_LOV_CREATED) |
1134                         (o2->mot_flags & MOF_LOV_CREATED);
1135
1136         o2->mot_flags = (o2->mot_flags & ~MOF_LOV_CREATED) |
1137                         (o1_flags & MOF_LOV_CREATED);
1138
1139         mutex_unlock(&o2->mot_lov_mutex);
1140         mutex_unlock(&o1->mot_lov_mutex);
1141 }
1142
1143 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1144 {
1145         struct mdt_thread_info  *info;
1146         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1147         struct obd_export       *exp = req->rq_export;
1148         struct mdt_object       *o1, *o2, *o;
1149         struct mdt_lock_handle  *lh1, *lh2;
1150         struct mdc_swap_layouts *msl;
1151         int                      rc;
1152         ENTRY;
1153
1154         /* client does not support layout lock, so layout swaping
1155          * is disabled.
1156          * FIXME: there is a problem for old clients which don't support
1157          * layout lock yet. If those clients have already opened the file
1158          * they won't be notified at all so that old layout may still be
1159          * used to do IO. This can be fixed after file release is landed by
1160          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1161         if (!exp_connect_layout(exp))
1162                 RETURN(-EOPNOTSUPP);
1163
1164         info = tsi2mdt_info(tsi);
1165
1166         if (info->mti_dlm_req != NULL)
1167                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1168
1169         o1 = info->mti_object;
1170         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1171                                 &info->mti_body->mbo_fid2);
1172         if (IS_ERR(o))
1173                 GOTO(out, rc = PTR_ERR(o));
1174
1175         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1176                 GOTO(put, rc = -ENOENT);
1177
1178         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1179         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1180                 GOTO(put, rc);
1181
1182         if (rc < 0)
1183                 swap(o1, o2);
1184
1185         /* permission check. Make sure the calling process having permission
1186          * to write both files. */
1187         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1188                                 MAY_WRITE);
1189         if (rc < 0)
1190                 GOTO(put, rc);
1191
1192         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1193                                 MAY_WRITE);
1194         if (rc < 0)
1195                 GOTO(put, rc);
1196
1197         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1198         if (msl == NULL)
1199                 GOTO(put, rc = -EPROTO);
1200
1201         lh1 = &info->mti_lh[MDT_LH_NEW];
1202         mdt_lock_reg_init(lh1, LCK_EX);
1203         lh2 = &info->mti_lh[MDT_LH_OLD];
1204         mdt_lock_reg_init(lh2, LCK_EX);
1205
1206         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1207                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1208         if (rc < 0)
1209                 GOTO(put, rc);
1210
1211         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1212                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1213         if (rc < 0)
1214                 GOTO(unlock1, rc);
1215
1216         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1217                              mdt_object_child(o2), msl->msl_flags);
1218         if (rc < 0)
1219                 GOTO(unlock2, rc);
1220
1221         mdt_swap_lov_flag(o1, o2);
1222
1223 unlock2:
1224         mdt_object_unlock(info, o2, lh2, rc);
1225 unlock1:
1226         mdt_object_unlock(info, o1, lh1, rc);
1227 put:
1228         mdt_object_put(info->mti_env, o);
1229 out:
1230         mdt_thread_info_fini(info);
1231         RETURN(rc);
1232 }
1233
1234 static int mdt_raw_lookup(struct mdt_thread_info *info,
1235                           struct mdt_object *parent,
1236                           const struct lu_name *lname,
1237                           struct ldlm_reply *ldlm_rep)
1238 {
1239         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1240         int              rc;
1241         ENTRY;
1242
1243         LASSERT(!info->mti_cross_ref);
1244
1245         /* Only got the fid of this obj by name */
1246         fid_zero(child_fid);
1247         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1248                         lname, child_fid, &info->mti_spec);
1249         if (rc == 0) {
1250                 struct mdt_body *repbody;
1251
1252                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1253                 repbody->mbo_fid1 = *child_fid;
1254                 repbody->mbo_valid = OBD_MD_FLID;
1255                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1256         } else if (rc == -ENOENT) {
1257                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1258         }
1259
1260         RETURN(rc);
1261 }
1262
1263 /*
1264  * UPDATE lock should be taken against parent, and be released before exit;
1265  * child_bits lock should be taken against child, and be returned back:
1266  *            (1)normal request should release the child lock;
1267  *            (2)intent request will grant the lock to client.
1268  */
1269 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1270                                  struct mdt_lock_handle *lhc,
1271                                  __u64 child_bits,
1272                                  struct ldlm_reply *ldlm_rep)
1273 {
1274         struct ptlrpc_request  *req       = mdt_info_req(info);
1275         struct mdt_body        *reqbody   = NULL;
1276         struct mdt_object      *parent    = info->mti_object;
1277         struct mdt_object      *child;
1278         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1279         struct lu_name         *lname     = NULL;
1280         struct mdt_lock_handle *lhp       = NULL;
1281         struct ldlm_lock       *lock;
1282         bool                    is_resent;
1283         bool                    try_layout;
1284         int                     ma_need = 0;
1285         int                     rc;
1286         ENTRY;
1287
1288         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1289         LASSERT(ergo(is_resent,
1290                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1291
1292         if (parent == NULL)
1293                 RETURN(-ENOENT);
1294
1295         if (info->mti_cross_ref) {
1296                 /* Only getattr on the child. Parent is on another node. */
1297                 mdt_set_disposition(info, ldlm_rep,
1298                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1299                 child = parent;
1300                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1301                        "ldlm_rep = %p\n",
1302                        PFID(mdt_object_fid(child)), ldlm_rep);
1303
1304                 rc = mdt_check_resent_lock(info, child, lhc);
1305                 if (rc < 0) {
1306                         RETURN(rc);
1307                 } else if (rc > 0) {
1308                         mdt_lock_handle_init(lhc);
1309                         mdt_lock_reg_init(lhc, LCK_PR);
1310
1311                         /*
1312                          * Object's name is on another MDS, no lookup or layout
1313                          * lock is needed here but update lock is.
1314                          */
1315                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1316                                         MDS_INODELOCK_LAYOUT);
1317                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1318
1319                         rc = mdt_object_lock(info, child, lhc, child_bits,
1320                                              MDT_LOCAL_LOCK);
1321                         if (rc < 0)
1322                                 RETURN(rc);
1323                 }
1324
1325                 /* Finally, we can get attr for child. */
1326                 if (!mdt_object_exists(child)) {
1327                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1328                                         &child->mot_obj,
1329                                         "remote object doesn't exist.\n");
1330                         mdt_object_unlock(info, child, lhc, 1);
1331                         RETURN(-ENOENT);
1332                 }
1333
1334                 rc = mdt_getattr_internal(info, child, 0);
1335                 if (unlikely(rc != 0))
1336                         mdt_object_unlock(info, child, lhc, 1);
1337
1338                 RETURN(rc);
1339         }
1340
1341         lname = &info->mti_name;
1342         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1343
1344         if (lu_name_is_valid(lname)) {
1345                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1346                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1347                        PNAME(lname), ldlm_rep);
1348         } else {
1349                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1350                 if (unlikely(reqbody == NULL))
1351                         RETURN(err_serious(-EPROTO));
1352
1353                 *child_fid = reqbody->mbo_fid2;
1354
1355                 if (unlikely(!fid_is_sane(child_fid)))
1356                         RETURN(err_serious(-EINVAL));
1357
1358                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1359                        "ldlm_rep = %p\n",
1360                        PFID(mdt_object_fid(parent)),
1361                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1362         }
1363
1364         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1365
1366         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1367                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1368                                 &parent->mot_obj,
1369                                 "Parent doesn't exist!\n");
1370                 RETURN(-ESTALE);
1371         }
1372
1373         if (mdt_object_remote(parent)) {
1374                 CERROR("%s: parent "DFID" is on remote target\n",
1375                        mdt_obd_name(info->mti_mdt),
1376                        PFID(mdt_object_fid(parent)));
1377                 RETURN(-EIO);
1378         }
1379
1380         if (lu_name_is_valid(lname)) {
1381                 /* Always allow to lookup ".." */
1382                 if (unlikely(lname->ln_namelen == 2 &&
1383                              lname->ln_name[0] == '.' &&
1384                              lname->ln_name[1] == '.'))
1385                         info->mti_spec.sp_permitted = 1;
1386
1387                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1388                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1389
1390                         RETURN(rc);
1391                 }
1392
1393                 /* step 1: lock parent only if parent is a directory */
1394                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1395                         lhp = &info->mti_lh[MDT_LH_PARENT];
1396                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1397                         rc = mdt_object_lock(info, parent, lhp,
1398                                              MDS_INODELOCK_UPDATE,
1399                                              MDT_LOCAL_LOCK);
1400                         if (unlikely(rc != 0))
1401                                 RETURN(rc);
1402                 }
1403
1404                 /* step 2: lookup child's fid by name */
1405                 fid_zero(child_fid);
1406                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1407                                 child_fid, &info->mti_spec);
1408                 if (rc == -ENOENT)
1409                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1410
1411                 if (rc != 0)
1412                         GOTO(out_parent, rc);
1413         }
1414
1415         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1416
1417         /*
1418          *step 3: find the child object by fid & lock it.
1419          *        regardless if it is local or remote.
1420          *
1421          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1422          *      set parent dir fid the same as child fid in getattr by fid case
1423          *      we should not lu_object_find() the object again, could lead
1424          *      to hung if there is a concurrent unlink destroyed the object.
1425          */
1426         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1427                 mdt_object_get(info->mti_env, parent);
1428                 child = parent;
1429         } else {
1430                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1431                                         child_fid);
1432         }
1433
1434         if (unlikely(IS_ERR(child)))
1435                 GOTO(out_parent, rc = PTR_ERR(child));
1436
1437         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout * 2);
1438         rc = mdt_check_resent_lock(info, child, lhc);
1439         if (rc < 0) {
1440                 GOTO(out_child, rc);
1441         } else if (rc > 0) {
1442                 mdt_lock_handle_init(lhc);
1443                 mdt_lock_reg_init(lhc, LCK_PR);
1444                 try_layout = false;
1445
1446                 if (!mdt_object_exists(child)) {
1447                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1448                                         &child->mot_obj,
1449                                         "Object doesn't exist!\n");
1450                         GOTO(out_child, rc = -ENOENT);
1451                 }
1452
1453                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1454                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1455                         struct md_attr *ma = &info->mti_attr;
1456
1457                         ma->ma_valid = 0;
1458                         ma->ma_need = MA_INODE;
1459                         rc = mdt_attr_get_complex(info, child, ma);
1460                         if (unlikely(rc != 0))
1461                                 GOTO(out_child, rc);
1462
1463                         /* If the file has not been changed for some time, we
1464                          * return not only a LOOKUP lock, but also an UPDATE
1465                          * lock and this might save us RPC on later STAT. For
1466                          * directories, it also let negative dentry cache start
1467                          * working for this dir. */
1468                         if (ma->ma_valid & MA_INODE &&
1469                             ma->ma_attr.la_valid & LA_CTIME &&
1470                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1471                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1472                                 child_bits |= MDS_INODELOCK_UPDATE;
1473                 }
1474
1475                 /* layout lock must be granted in a best-effort way
1476                  * for IT operations */
1477                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1478                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1479                     exp_connect_layout(info->mti_exp) &&
1480                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1481                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1482                         /* try to grant layout lock for regular file. */
1483                         try_layout = true;
1484                 }
1485
1486                 rc = 0;
1487                 if (try_layout) {
1488                         child_bits |= MDS_INODELOCK_LAYOUT;
1489                         /* try layout lock, it may fail to be granted due to
1490                          * contention at LOOKUP or UPDATE */
1491                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1492                                                  MDT_CROSS_LOCK)) {
1493                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1494                                 LASSERT(child_bits != 0);
1495                                 rc = mdt_object_lock(info, child, lhc,
1496                                                 child_bits, MDT_CROSS_LOCK);
1497                         } else {
1498                                 ma_need |= MA_LOV;
1499                         }
1500                 } else {
1501                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1502                          * client will enqueue the lock to the remote MDT */
1503                         if (mdt_object_remote(child))
1504                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1505                         rc = mdt_object_lock(info, child, lhc, child_bits,
1506                                                 MDT_CROSS_LOCK);
1507                 }
1508                 if (unlikely(rc != 0))
1509                         GOTO(out_child, rc);
1510         }
1511
1512         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1513
1514         /* finally, we can get attr for child. */
1515         rc = mdt_getattr_internal(info, child, ma_need);
1516         if (unlikely(rc != 0)) {
1517                 mdt_object_unlock(info, child, lhc, 1);
1518         } else if (lock) {
1519                 /* Debugging code. */
1520                 LDLM_DEBUG(lock, "Returning lock to client");
1521                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1522                                          &lock->l_resource->lr_name),
1523                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1524                          PLDLMRES(lock->l_resource),
1525                          PFID(mdt_object_fid(child)));
1526         }
1527         if (lock)
1528                 LDLM_LOCK_PUT(lock);
1529
1530         EXIT;
1531 out_child:
1532         mdt_object_put(info->mti_env, child);
1533 out_parent:
1534         if (lhp)
1535                 mdt_object_unlock(info, parent, lhp, 1);
1536         return rc;
1537 }
1538
1539 /* normal handler: should release the child lock */
1540 static int mdt_getattr_name(struct tgt_session_info *tsi)
1541 {
1542         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1543         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1544         struct mdt_body        *reqbody;
1545         struct mdt_body        *repbody;
1546         int rc, rc2;
1547         ENTRY;
1548
1549         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1550         LASSERT(reqbody != NULL);
1551         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1552         LASSERT(repbody != NULL);
1553
1554         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1555         repbody->mbo_eadatasize = 0;
1556         repbody->mbo_aclsize = 0;
1557
1558         rc = mdt_init_ucred(info, reqbody);
1559         if (unlikely(rc))
1560                 GOTO(out_shrink, rc);
1561
1562         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1563         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1564                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1565                 lhc->mlh_reg_lh.cookie = 0;
1566         }
1567         mdt_exit_ucred(info);
1568         EXIT;
1569 out_shrink:
1570         mdt_client_compatibility(info);
1571         rc2 = mdt_fix_reply(info);
1572         if (rc == 0)
1573                 rc = rc2;
1574         mdt_thread_info_fini(info);
1575         return rc;
1576 }
1577
1578 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1579                          void *karg, void *uarg);
1580
1581 static int mdt_set_info(struct tgt_session_info *tsi)
1582 {
1583         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1584         char                    *key;
1585         void                    *val;
1586         int                      keylen, vallen, rc = 0;
1587
1588         ENTRY;
1589
1590         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1591         if (key == NULL) {
1592                 DEBUG_REQ(D_HA, req, "no set_info key");
1593                 RETURN(err_serious(-EFAULT));
1594         }
1595
1596         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1597                                       RCL_CLIENT);
1598
1599         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1600         if (val == NULL) {
1601                 DEBUG_REQ(D_HA, req, "no set_info val");
1602                 RETURN(err_serious(-EFAULT));
1603         }
1604
1605         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1606                                       RCL_CLIENT);
1607
1608         /* Swab any part of val you need to here */
1609         if (KEY_IS(KEY_READ_ONLY)) {
1610                 spin_lock(&req->rq_export->exp_lock);
1611                 if (*(__u32 *)val)
1612                         *exp_connect_flags_ptr(req->rq_export) |=
1613                                 OBD_CONNECT_RDONLY;
1614                 else
1615                         *exp_connect_flags_ptr(req->rq_export) &=
1616                                 ~OBD_CONNECT_RDONLY;
1617                 spin_unlock(&req->rq_export->exp_lock);
1618         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1619                 struct changelog_setinfo *cs = val;
1620
1621                 if (vallen != sizeof(*cs)) {
1622                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1623                                tgt_name(tsi->tsi_tgt), vallen);
1624                         RETURN(-EINVAL);
1625                 }
1626                 if (ptlrpc_req_need_swab(req)) {
1627                         __swab64s(&cs->cs_recno);
1628                         __swab32s(&cs->cs_id);
1629                 }
1630
1631                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1632                                    vallen, val, NULL);
1633         } else {
1634                 RETURN(-EINVAL);
1635         }
1636         RETURN(rc);
1637 }
1638
1639 static int mdt_readpage(struct tgt_session_info *tsi)
1640 {
1641         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1642         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1643         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1644         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1645         struct mdt_body         *repbody;
1646         int                      rc;
1647         int                      i;
1648
1649         ENTRY;
1650
1651         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1652                 RETURN(err_serious(-ENOMEM));
1653
1654         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1655         if (repbody == NULL || reqbody == NULL)
1656                 RETURN(err_serious(-EFAULT));
1657
1658         /*
1659          * prepare @rdpg before calling lower layers and transfer itself. Here
1660          * reqbody->size contains offset of where to start to read and
1661          * reqbody->nlink contains number bytes to read.
1662          */
1663         rdpg->rp_hash = reqbody->mbo_size;
1664         if (rdpg->rp_hash != reqbody->mbo_size) {
1665                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1666                        rdpg->rp_hash, reqbody->mbo_size);
1667                 RETURN(-EFAULT);
1668         }
1669
1670         rdpg->rp_attrs = reqbody->mbo_mode;
1671         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1672                 rdpg->rp_attrs |= LUDA_64BITHASH;
1673         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1674                                 exp_max_brw_size(tsi->tsi_exp));
1675         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1676                           PAGE_CACHE_SHIFT;
1677         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1678         if (rdpg->rp_pages == NULL)
1679                 RETURN(-ENOMEM);
1680
1681         for (i = 0; i < rdpg->rp_npages; ++i) {
1682                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1683                 if (rdpg->rp_pages[i] == NULL)
1684                         GOTO(free_rdpg, rc = -ENOMEM);
1685         }
1686
1687         /* call lower layers to fill allocated pages with directory data */
1688         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1689         if (rc < 0)
1690                 GOTO(free_rdpg, rc);
1691
1692         /* send pages to client */
1693         rc = tgt_sendpage(tsi, rdpg, rc);
1694
1695         EXIT;
1696 free_rdpg:
1697
1698         for (i = 0; i < rdpg->rp_npages; i++)
1699                 if (rdpg->rp_pages[i] != NULL)
1700                         __free_page(rdpg->rp_pages[i]);
1701         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1702
1703         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1704                 RETURN(0);
1705
1706         return rc;
1707 }
1708
1709 static int mdt_reint_internal(struct mdt_thread_info *info,
1710                               struct mdt_lock_handle *lhc,
1711                               __u32 op)
1712 {
1713         struct req_capsule      *pill = info->mti_pill;
1714         struct mdt_body         *repbody;
1715         int                      rc = 0, rc2;
1716
1717         ENTRY;
1718
1719         rc = mdt_reint_unpack(info, op);
1720         if (rc != 0) {
1721                 CERROR("Can't unpack reint, rc %d\n", rc);
1722                 RETURN(err_serious(rc));
1723         }
1724
1725         /* for replay (no_create) lmm is not needed, client has it already */
1726         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1727                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1728                                      DEF_REP_MD_SIZE);
1729
1730         /* llog cookies are always 0, the field is kept for compatibility */
1731         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1732                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1733
1734         rc = req_capsule_server_pack(pill);
1735         if (rc != 0) {
1736                 CERROR("Can't pack response, rc %d\n", rc);
1737                 RETURN(err_serious(rc));
1738         }
1739
1740         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1741                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1742                 LASSERT(repbody);
1743                 repbody->mbo_eadatasize = 0;
1744                 repbody->mbo_aclsize = 0;
1745         }
1746
1747         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1748
1749         /* for replay no cookkie / lmm need, because client have this already */
1750         if (info->mti_spec.no_create)
1751                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1752                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1753
1754         rc = mdt_init_ucred_reint(info);
1755         if (rc)
1756                 GOTO(out_shrink, rc);
1757
1758         rc = mdt_fix_attr_ucred(info, op);
1759         if (rc != 0)
1760                 GOTO(out_ucred, rc = err_serious(rc));
1761
1762         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1763                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1764                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1765                 GOTO(out_ucred, rc);
1766         }
1767         rc = mdt_reint_rec(info, lhc);
1768         EXIT;
1769 out_ucred:
1770         mdt_exit_ucred(info);
1771 out_shrink:
1772         mdt_client_compatibility(info);
1773         rc2 = mdt_fix_reply(info);
1774         if (rc == 0)
1775                 rc = rc2;
1776         return rc;
1777 }
1778
1779 static long mdt_reint_opcode(struct ptlrpc_request *req,
1780                              const struct req_format **fmt)
1781 {
1782         struct mdt_device       *mdt;
1783         struct mdt_rec_reint    *rec;
1784         long                     opc;
1785
1786         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1787         if (rec != NULL) {
1788                 opc = rec->rr_opcode;
1789                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1790                 if (opc < REINT_MAX && fmt[opc] != NULL)
1791                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1792                 else {
1793                         mdt = mdt_exp2dev(req->rq_export);
1794                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1795                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1796                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1797                         opc = err_serious(-EFAULT);
1798                 }
1799         } else {
1800                 opc = err_serious(-EFAULT);
1801         }
1802         return opc;
1803 }
1804
1805 static int mdt_reint(struct tgt_session_info *tsi)
1806 {
1807         long opc;
1808         int  rc;
1809         static const struct req_format *reint_fmts[REINT_MAX] = {
1810                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1811                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1812                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1813                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1814                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1815                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1816                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1817                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1818                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1819         };
1820
1821         ENTRY;
1822
1823         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1824         if (opc >= 0) {
1825                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1826                 /*
1827                  * No lock possible here from client to pass it to reint code
1828                  * path.
1829                  */
1830                 rc = mdt_reint_internal(info, NULL, opc);
1831                 mdt_thread_info_fini(info);
1832         } else {
1833                 rc = opc;
1834         }
1835
1836         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1837         RETURN(rc);
1838 }
1839
1840 /* this should sync the whole device */
1841 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1842 {
1843         struct dt_device *dt = mdt->mdt_bottom;
1844         int rc;
1845         ENTRY;
1846
1847         rc = dt->dd_ops->dt_sync(env, dt);
1848         RETURN(rc);
1849 }
1850
1851 /* this should sync this object */
1852 static int mdt_object_sync(struct mdt_thread_info *info)
1853 {
1854         struct md_object *next;
1855         int rc;
1856         ENTRY;
1857
1858         if (!mdt_object_exists(info->mti_object)) {
1859                 CWARN("%s: non existing object "DFID": rc = %d\n",
1860                       mdt_obd_name(info->mti_mdt),
1861                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
1862                 RETURN(-ESTALE);
1863         }
1864         next = mdt_object_child(info->mti_object);
1865         rc = mo_object_sync(info->mti_env, next);
1866
1867         RETURN(rc);
1868 }
1869
1870 static int mdt_sync(struct tgt_session_info *tsi)
1871 {
1872         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1873         struct req_capsule      *pill = tsi->tsi_pill;
1874         struct mdt_body         *body;
1875         int                      rc;
1876
1877         ENTRY;
1878
1879         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1880                 RETURN(err_serious(-ENOMEM));
1881
1882         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
1883                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1884         } else {
1885                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1886
1887                 /* sync an object */
1888                 rc = mdt_object_sync(info);
1889                 if (rc == 0) {
1890                         const struct lu_fid *fid;
1891                         struct lu_attr *la = &info->mti_attr.ma_attr;
1892
1893                         info->mti_attr.ma_need = MA_INODE;
1894                         info->mti_attr.ma_valid = 0;
1895                         rc = mdt_attr_get_complex(info, info->mti_object,
1896                                                   &info->mti_attr);
1897                         if (rc == 0) {
1898                                 body = req_capsule_server_get(pill,
1899                                                               &RMF_MDT_BODY);
1900                                 fid = mdt_object_fid(info->mti_object);
1901                                 mdt_pack_attr2body(info, body, la, fid);
1902                         }
1903                 }
1904                 mdt_thread_info_fini(info);
1905         }
1906         if (rc == 0)
1907                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1908
1909         RETURN(rc);
1910 }
1911
1912 /*
1913  * Handle quota control requests to consult current usage/limit, but also
1914  * to configure quota enforcement
1915  */
1916 static int mdt_quotactl(struct tgt_session_info *tsi)
1917 {
1918         struct obd_export       *exp  = tsi->tsi_exp;
1919         struct req_capsule      *pill = tsi->tsi_pill;
1920         struct obd_quotactl     *oqctl, *repoqc;
1921         int                      id, rc;
1922         struct mdt_device       *mdt = mdt_exp2dev(exp);
1923         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1924         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
1925         ENTRY;
1926
1927         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1928         if (oqctl == NULL)
1929                 RETURN(err_serious(-EPROTO));
1930
1931         rc = req_capsule_server_pack(pill);
1932         if (rc)
1933                 RETURN(err_serious(rc));
1934
1935         switch (oqctl->qc_cmd) {
1936         case Q_QUOTACHECK:
1937         case LUSTRE_Q_INVALIDATE:
1938         case LUSTRE_Q_FINVALIDATE:
1939         case Q_QUOTAON:
1940         case Q_QUOTAOFF:
1941         case Q_INITQUOTA:
1942                 /* deprecated, not used any more */
1943                 RETURN(-EOPNOTSUPP);
1944                 /* master quotactl */
1945         case Q_SETINFO:
1946         case Q_SETQUOTA:
1947                 if (!nodemap_can_setquota(nodemap))
1948                         RETURN(-EPERM);
1949         case Q_GETINFO:
1950         case Q_GETQUOTA:
1951                 if (qmt == NULL)
1952                         RETURN(-EOPNOTSUPP);
1953                 /* slave quotactl */
1954         case Q_GETOINFO:
1955         case Q_GETOQUOTA:
1956                 break;
1957         default:
1958                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1959                 RETURN(-EFAULT);
1960         }
1961
1962         /* map uid/gid for remote client */
1963         id = oqctl->qc_id;
1964         if (exp_connect_rmtclient(exp)) {
1965                 struct lustre_idmap_table *idmap;
1966
1967                 idmap = exp->exp_mdt_data.med_idmap;
1968
1969                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
1970                              oqctl->qc_cmd != Q_GETINFO))
1971                         RETURN(-EPERM);
1972
1973                 if (oqctl->qc_type == USRQUOTA)
1974                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
1975                                                      oqctl->qc_id);
1976                 else if (oqctl->qc_type == GRPQUOTA)
1977                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
1978                                                      oqctl->qc_id);
1979                 else
1980                         RETURN(-EINVAL);
1981
1982                 if (id == CFS_IDMAP_NOTFOUND) {
1983                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
1984                         RETURN(-EACCES);
1985                 }
1986         }
1987
1988         if (oqctl->qc_type == USRQUOTA)
1989                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1990                                     NODEMAP_CLIENT_TO_FS, id);
1991         else if (oqctl->qc_type == GRPQUOTA)
1992                 id = nodemap_map_id(nodemap, NODEMAP_UID,
1993                                     NODEMAP_CLIENT_TO_FS, id);
1994
1995         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
1996         if (repoqc == NULL)
1997                 RETURN(err_serious(-EFAULT));
1998
1999         if (oqctl->qc_id != id)
2000                 swap(oqctl->qc_id, id);
2001
2002         switch (oqctl->qc_cmd) {
2003
2004         case Q_GETINFO:
2005         case Q_SETINFO:
2006         case Q_SETQUOTA:
2007         case Q_GETQUOTA:
2008                 /* forward quotactl request to QMT */
2009                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2010                 break;
2011
2012         case Q_GETOINFO:
2013         case Q_GETOQUOTA:
2014                 /* slave quotactl */
2015                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2016                                    oqctl);
2017                 break;
2018
2019         default:
2020                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2021                 RETURN(-EFAULT);
2022         }
2023
2024         if (oqctl->qc_id != id)
2025                 swap(oqctl->qc_id, id);
2026
2027         *repoqc = *oqctl;
2028         RETURN(rc);
2029 }
2030
2031 /** clone llog ctxt from child (mdd)
2032  * This allows remote llog (replicator) access.
2033  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2034  * context was originally set up, or we can handle them directly.
2035  * I choose the latter, but that means I need any llog
2036  * contexts set up by child to be accessable by the mdt.  So we clone the
2037  * context into our context list here.
2038  */
2039 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2040                                int idx)
2041 {
2042         struct md_device  *next = mdt->mdt_child;
2043         struct llog_ctxt *ctxt;
2044         int rc;
2045
2046         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2047                 return 0;
2048
2049         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2050         if (rc || ctxt == NULL) {
2051                 return 0;
2052         }
2053
2054         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2055         if (rc)
2056                 CERROR("Can't set mdt ctxt %d\n", rc);
2057
2058         return rc;
2059 }
2060
2061 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2062                                  struct mdt_device *mdt, int idx)
2063 {
2064         struct llog_ctxt *ctxt;
2065
2066         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2067         if (ctxt == NULL)
2068                 return 0;
2069         /* Put once for the get we just did, and once for the clone */
2070         llog_ctxt_put(ctxt);
2071         llog_ctxt_put(ctxt);
2072         return 0;
2073 }
2074
2075 /*
2076  * sec context handlers
2077  */
2078 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2079 {
2080         int rc;
2081
2082         rc = mdt_handle_idmap(tsi);
2083         if (unlikely(rc)) {
2084                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2085                 __u32                    opc;
2086
2087                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2088                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2089                         sptlrpc_svc_ctx_invalidate(req);
2090         }
2091
2092         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2093
2094         return rc;
2095 }
2096
2097 /*
2098  * quota request handlers
2099  */
2100 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2101 {
2102         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2103         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2104         int                      rc;
2105         ENTRY;
2106
2107         if (qmt == NULL)
2108                 RETURN(err_serious(-EOPNOTSUPP));
2109
2110         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2111         RETURN(rc);
2112 }
2113
2114 struct mdt_object *mdt_object_new(const struct lu_env *env,
2115                                   struct mdt_device *d,
2116                                   const struct lu_fid *f)
2117 {
2118         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2119         struct lu_object *o;
2120         struct mdt_object *m;
2121         ENTRY;
2122
2123         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2124         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2125         if (unlikely(IS_ERR(o)))
2126                 m = (struct mdt_object *)o;
2127         else
2128                 m = mdt_obj(o);
2129         RETURN(m);
2130 }
2131
2132 struct mdt_object *mdt_object_find(const struct lu_env *env,
2133                                    struct mdt_device *d,
2134                                    const struct lu_fid *f)
2135 {
2136         struct lu_object *o;
2137         struct mdt_object *m;
2138         ENTRY;
2139
2140         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2141         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2142         if (unlikely(IS_ERR(o)))
2143                 m = (struct mdt_object *)o;
2144         else
2145                 m = mdt_obj(o);
2146
2147         RETURN(m);
2148 }
2149
2150 /**
2151  * Asyncronous commit for mdt device.
2152  *
2153  * Pass asynchonous commit call down the MDS stack.
2154  *
2155  * \param env environment
2156  * \param mdt the mdt device
2157  */
2158 static void mdt_device_commit_async(const struct lu_env *env,
2159                                     struct mdt_device *mdt)
2160 {
2161         struct dt_device *dt = mdt->mdt_bottom;
2162         int rc;
2163
2164         rc = dt->dd_ops->dt_commit_async(env, dt);
2165         if (unlikely(rc != 0))
2166                 CWARN("%s: async commit start failed: rc = %d\n",
2167                       mdt_obd_name(mdt), rc);
2168 }
2169
2170 /**
2171  * Mark the lock as "synchonous".
2172  *
2173  * Mark the lock to deffer transaction commit to the unlock time.
2174  *
2175  * \param lock the lock to mark as "synchonous"
2176  *
2177  * \see mdt_is_lock_sync
2178  * \see mdt_save_lock
2179  */
2180 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2181 {
2182         lock->l_ast_data = (void*)1;
2183 }
2184
2185 /**
2186  * Check whehter the lock "synchonous" or not.
2187  *
2188  * \param lock the lock to check
2189  * \retval 1 the lock is "synchonous"
2190  * \retval 0 the lock isn't "synchronous"
2191  *
2192  * \see mdt_set_lock_sync
2193  * \see mdt_save_lock
2194  */
2195 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2196 {
2197         return lock->l_ast_data != NULL;
2198 }
2199
2200 /**
2201  * Blocking AST for mdt locks.
2202  *
2203  * Starts transaction commit if in case of COS lock conflict or
2204  * deffers such a commit to the mdt_save_lock.
2205  *
2206  * \param lock the lock which blocks a request or cancelling lock
2207  * \param desc unused
2208  * \param data unused
2209  * \param flag indicates whether this cancelling or blocking callback
2210  * \retval 0
2211  * \see ldlm_blocking_ast_nocheck
2212  */
2213 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2214                      void *data, int flag)
2215 {
2216         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2217         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2218         int rc;
2219         ENTRY;
2220
2221         if (flag == LDLM_CB_CANCELING)
2222                 RETURN(0);
2223         lock_res_and_lock(lock);
2224         if (lock->l_blocking_ast != mdt_blocking_ast) {
2225                 unlock_res_and_lock(lock);
2226                 RETURN(0);
2227         }
2228         if (mdt_cos_is_enabled(mdt) &&
2229             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2230             lock->l_blocking_lock != NULL &&
2231             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2232                 mdt_set_lock_sync(lock);
2233         }
2234         rc = ldlm_blocking_ast_nocheck(lock);
2235
2236         /* There is no lock conflict if l_blocking_lock == NULL,
2237          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2238          * when the last reference to a local lock was released */
2239         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2240                 struct lu_env env;
2241
2242                 rc = lu_env_init(&env, LCT_LOCAL);
2243                 if (unlikely(rc != 0))
2244                         CWARN("%s: lu_env initialization failed, cannot "
2245                               "start asynchronous commit: rc = %d\n",
2246                               obd->obd_name, rc);
2247                 else
2248                         mdt_device_commit_async(&env, mdt);
2249                 lu_env_fini(&env);
2250         }
2251         RETURN(rc);
2252 }
2253
2254 /* Used for cross-MDT lock */
2255 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2256                             void *data, int flag)
2257 {
2258         struct lustre_handle lockh;
2259         int               rc;
2260
2261         switch (flag) {
2262         case LDLM_CB_BLOCKING:
2263                 ldlm_lock2handle(lock, &lockh);
2264                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2265                 if (rc < 0) {
2266                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2267                         RETURN(rc);
2268                 }
2269                 break;
2270         case LDLM_CB_CANCELING:
2271                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2272                 break;
2273         default:
2274                 LBUG();
2275         }
2276         RETURN(0);
2277 }
2278
2279 int mdt_check_resent_lock(struct mdt_thread_info *info,
2280                           struct mdt_object *mo,
2281                           struct mdt_lock_handle *lhc)
2282 {
2283         /* the lock might already be gotten in ldlm_handle_enqueue() */
2284         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2285                 struct ptlrpc_request *req = mdt_info_req(info);
2286                 struct ldlm_lock      *lock;
2287
2288                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2289                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2290                 if (lock == NULL) {
2291                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2292                          * a resend case, however, it could be already destroyed
2293                          * due to client eviction or a raced cancel RPC. */
2294                         LDLM_DEBUG_NOLOCK("Invalid lock handle "LPX64"\n",
2295                                           lhc->mlh_reg_lh.cookie);
2296                         RETURN(-ESTALE);
2297                 }
2298
2299                 if (!fid_res_name_eq(mdt_object_fid(mo),
2300                                      &lock->l_resource->lr_name)) {
2301                         CWARN("%s: Although resent, but still not "
2302                               "get child lock:"DFID"\n",
2303                               info->mti_exp->exp_obd->obd_name,
2304                               PFID(mdt_object_fid(mo)));
2305                         LDLM_LOCK_PUT(lock);
2306                         RETURN(-EPROTO);
2307                 }
2308                 LDLM_LOCK_PUT(lock);
2309                 return 0;
2310         }
2311         return 1;
2312 }
2313
2314 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2315                            struct mdt_object *o, const struct lu_fid *fid,
2316                            struct lustre_handle *lh, ldlm_mode_t mode,
2317                            __u64 ibits)
2318 {
2319         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2320         ldlm_policy_data_t *policy = &mti->mti_policy;
2321         struct ldlm_res_id *res_id = &mti->mti_res_id;
2322         int rc = 0;
2323         ENTRY;
2324
2325         LASSERT(mdt_object_remote(o));
2326
2327         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2328
2329         fid_build_reg_res_name(fid, res_id);
2330
2331         memset(einfo, 0, sizeof(*einfo));
2332         einfo->ei_type = LDLM_IBITS;
2333         einfo->ei_mode = mode;
2334         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2335         einfo->ei_cb_cp = ldlm_completion_ast;
2336         einfo->ei_enq_slave = 0;
2337         einfo->ei_res_id = res_id;
2338
2339         memset(policy, 0, sizeof(*policy));
2340         policy->l_inodebits.bits = ibits;
2341
2342         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2343                             policy);
2344         RETURN(rc);
2345 }
2346
2347 static int mdt_object_local_lock(struct mdt_thread_info *info,
2348                                  struct mdt_object *o,
2349                                  struct mdt_lock_handle *lh, __u64 ibits,
2350                                  bool nonblock, int locality)
2351 {
2352         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2353         ldlm_policy_data_t *policy = &info->mti_policy;
2354         struct ldlm_res_id *res_id = &info->mti_res_id;
2355         __u64 dlmflags;
2356         int rc;
2357         ENTRY;
2358
2359         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2360         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2361         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2362         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2363
2364         /* Only enqueue LOOKUP lock for remote object */
2365         if (mdt_object_remote(o))
2366                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2367
2368         if (lh->mlh_type == MDT_PDO_LOCK) {
2369                 /* check for exists after object is locked */
2370                 if (mdt_object_exists(o) == 0) {
2371                         /* Non-existent object shouldn't have PDO lock */
2372                         RETURN(-ESTALE);
2373                 } else {
2374                         /* Non-dir object shouldn't have PDO lock */
2375                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2376                                 RETURN(-ENOTDIR);
2377                 }
2378         }
2379
2380         memset(policy, 0, sizeof(*policy));
2381         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2382
2383         dlmflags = LDLM_FL_ATOMIC_CB;
2384         if (nonblock)
2385                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2386
2387         /*
2388          * Take PDO lock on whole directory and build correct @res_id for lock
2389          * on part of directory.
2390          */
2391         if (lh->mlh_pdo_hash != 0) {
2392                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2393                 mdt_lock_pdo_mode(info, o, lh);
2394                 if (lh->mlh_pdo_mode != LCK_NL) {
2395                         /*
2396                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2397                          * is never going to be sent to client and we do not
2398                          * want it slowed down due to possible cancels.
2399                          */
2400                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2401                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2402                                           policy, res_id, dlmflags,
2403                                           info->mti_exp == NULL ? NULL :
2404                                           &info->mti_exp->exp_handle.h_cookie);
2405                         if (unlikely(rc != 0))
2406                                 GOTO(out_unlock, rc);
2407                 }
2408
2409                 /*
2410                  * Finish res_id initializing by name hash marking part of
2411                  * directory which is taking modification.
2412                  */
2413                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2414         }
2415
2416         policy->l_inodebits.bits = ibits;
2417
2418         /*
2419          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2420          * going to be sent to client. If it is - mdt_intent_policy() path will
2421          * fix it up and turn FL_LOCAL flag off.
2422          */
2423         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2424                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2425                           info->mti_exp == NULL ? NULL :
2426                           &info->mti_exp->exp_handle.h_cookie);
2427 out_unlock:
2428         if (rc != 0)
2429                 mdt_object_unlock(info, o, lh, 1);
2430         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2431                    lh->mlh_pdo_hash != 0 &&
2432                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2433                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2434
2435         RETURN(rc);
2436 }
2437
2438 static int
2439 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2440                          struct mdt_lock_handle *lh, __u64 ibits,
2441                          bool nonblock, int locality)
2442 {
2443         int rc;
2444         ENTRY;
2445
2446         if (!mdt_object_remote(o))
2447                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2448                                              locality);
2449
2450         if (locality == MDT_LOCAL_LOCK) {
2451                 CERROR("%s: try to get local lock for remote object"
2452                        DFID".\n", mdt_obd_name(info->mti_mdt),
2453                        PFID(mdt_object_fid(o)));
2454                 RETURN(-EPROTO);
2455         }
2456
2457         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2458         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2459                    MDS_INODELOCK_XATTR);
2460         if (ibits & MDS_INODELOCK_UPDATE) {
2461                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2462                  * enqueue RPC can only request 1 lock, to avoid extra
2463                  * RPC, so it will instead enqueue EX lock for remote
2464                  * object anyway XXX*/
2465                 if (lh->mlh_type == MDT_PDO_LOCK &&
2466                     lh->mlh_pdo_hash != 0) {
2467                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2468                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2469                                PFID(mdt_object_fid(o)));
2470                         lh->mlh_pdo_hash = 0;
2471                         lh->mlh_rreg_mode = LCK_EX;
2472                         lh->mlh_type = MDT_REG_LOCK;
2473                 }
2474                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2475                                             &lh->mlh_rreg_lh,
2476                                             lh->mlh_rreg_mode,
2477                                             MDS_INODELOCK_UPDATE);
2478                 if (rc != ELDLM_OK)
2479                         RETURN(rc);
2480         }
2481
2482         /* Only enqueue LOOKUP lock for remote object */
2483         if (ibits & MDS_INODELOCK_LOOKUP) {
2484                 rc = mdt_object_local_lock(info, o, lh,
2485                                            MDS_INODELOCK_LOOKUP,
2486                                            nonblock, locality);
2487                 if (rc != ELDLM_OK)
2488                         RETURN(rc);
2489         }
2490
2491         RETURN(0);
2492 }
2493
2494 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2495                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2496 {
2497         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2498 }
2499
2500 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2501                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2502 {
2503         struct mdt_lock_handle tmp = *lh;
2504         int rc;
2505
2506         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2507         if (rc == 0)
2508                 *lh = tmp;
2509
2510         return rc == 0;
2511 }
2512
2513 /**
2514  * Save a lock within request object.
2515  *
2516  * Keep the lock referenced until whether client ACK or transaction
2517  * commit happens or release the lock immediately depending on input
2518  * parameters. If COS is ON, a write lock is converted to COS lock
2519  * before saving.
2520  *
2521  * \param info thead info object
2522  * \param h lock handle
2523  * \param mode lock mode
2524  * \param decref force immediate lock releasing
2525  */
2526 static
2527 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2528                    ldlm_mode_t mode, int decref)
2529 {
2530         ENTRY;
2531
2532         if (lustre_handle_is_used(h)) {
2533                 if (decref || !info->mti_has_trans ||
2534                     !(mode & (LCK_PW | LCK_EX))){
2535                         mdt_fid_unlock(h, mode);
2536                 } else {
2537                         struct mdt_device *mdt = info->mti_mdt;
2538                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2539                         struct ptlrpc_request *req = mdt_info_req(info);
2540                         int no_ack = 0;
2541
2542                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2543                                  h->cookie);
2544                         /* there is no request if mdt_object_unlock() is called
2545                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2546                         if (likely(req != NULL)) {
2547                                 CDEBUG(D_HA, "request = %p reply state = %p"
2548                                        " transno = "LPD64"\n", req,
2549                                        req->rq_reply_state, req->rq_transno);
2550                                 if (mdt_cos_is_enabled(mdt)) {
2551                                         no_ack = 1;
2552                                         ldlm_lock_downgrade(lock, LCK_COS);
2553                                         mode = LCK_COS;
2554                                 }
2555                                 ptlrpc_save_lock(req, h, mode, no_ack);
2556                         } else {
2557                                 ldlm_lock_decref(h, mode);
2558                         }
2559                         if (mdt_is_lock_sync(lock)) {
2560                                 CDEBUG(D_HA, "found sync-lock,"
2561                                        " async commit started\n");
2562                                 mdt_device_commit_async(info->mti_env,
2563                                                         mdt);
2564                         }
2565                         LDLM_LOCK_PUT(lock);
2566                 }
2567                 h->cookie = 0ull;
2568         }
2569
2570         EXIT;
2571 }
2572
2573 /**
2574  * Unlock mdt object.
2575  *
2576  * Immeditely release the regular lock and the PDO lock or save the
2577  * lock in request and keep them referenced until client ACK or
2578  * transaction commit.
2579  *
2580  * \param info thread info object
2581  * \param o mdt object
2582  * \param lh mdt lock handle referencing regular and PDO locks
2583  * \param decref force immediate lock releasing
2584  */
2585 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2586                        struct mdt_lock_handle *lh, int decref)
2587 {
2588         ENTRY;
2589
2590         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2591         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2592
2593         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2594                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2595
2596         EXIT;
2597 }
2598
2599 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2600                                         const struct lu_fid *f,
2601                                         struct mdt_lock_handle *lh,
2602                                         __u64 ibits)
2603 {
2604         struct mdt_object *o;
2605
2606         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2607         if (!IS_ERR(o)) {
2608                 int rc;
2609
2610                 rc = mdt_object_lock(info, o, lh, ibits,
2611                                      MDT_LOCAL_LOCK);
2612                 if (rc != 0) {
2613                         mdt_object_put(info->mti_env, o);
2614                         o = ERR_PTR(rc);
2615                 }
2616         }
2617         return o;
2618 }
2619
2620 void mdt_object_unlock_put(struct mdt_thread_info * info,
2621                            struct mdt_object * o,
2622                            struct mdt_lock_handle *lh,
2623                            int decref)
2624 {
2625         mdt_object_unlock(info, o, lh, decref);
2626         mdt_object_put(info->mti_env, o);
2627 }
2628
2629 /*
2630  * Generic code handling requests that have struct mdt_body passed in:
2631  *
2632  *  - extract mdt_body from request and save it in @info, if present;
2633  *
2634  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2635  *  @info;
2636  *
2637  *  - if HABEO_CORPUS flag is set for this request type check whether object
2638  *  actually exists on storage (lu_object_exists()).
2639  *
2640  */
2641 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2642 {
2643         const struct mdt_body    *body;
2644         struct mdt_object        *obj;
2645         const struct lu_env      *env;
2646         struct req_capsule       *pill;
2647         int                       rc;
2648         ENTRY;
2649
2650         env = info->mti_env;
2651         pill = info->mti_pill;
2652
2653         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2654         if (body == NULL)
2655                 RETURN(-EFAULT);
2656
2657         if (!(body->mbo_valid & OBD_MD_FLID))
2658                 RETURN(0);
2659
2660         if (!fid_is_sane(&body->mbo_fid1)) {
2661                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2662                 RETURN(-EINVAL);
2663         }
2664
2665         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
2666         if (!IS_ERR(obj)) {
2667                 if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
2668                         mdt_object_put(env, obj);
2669                         rc = -ENOENT;
2670                 } else {
2671                         info->mti_object = obj;
2672                         rc = 0;
2673                 }
2674         } else
2675                 rc = PTR_ERR(obj);
2676
2677         RETURN(rc);
2678 }
2679
2680 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2681 {
2682         struct req_capsule *pill = info->mti_pill;
2683         int rc;
2684         ENTRY;
2685
2686         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2687                 rc = mdt_body_unpack(info, flags);
2688         else
2689                 rc = 0;
2690
2691         if (rc == 0 && (flags & HABEO_REFERO)) {
2692                 /* Pack reply. */
2693                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2694                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2695                                              DEF_REP_MD_SIZE);
2696                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2697                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2698                                              RCL_SERVER, 0);
2699
2700                 rc = req_capsule_server_pack(pill);
2701         }
2702         RETURN(rc);
2703 }
2704
2705 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2706 {
2707         lh->mlh_type = MDT_NUL_LOCK;
2708         lh->mlh_reg_lh.cookie = 0ull;
2709         lh->mlh_reg_mode = LCK_MINMODE;
2710         lh->mlh_pdo_lh.cookie = 0ull;
2711         lh->mlh_pdo_mode = LCK_MINMODE;
2712         lh->mlh_rreg_lh.cookie = 0ull;
2713         lh->mlh_rreg_mode = LCK_MINMODE;
2714 }
2715
2716 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2717 {
2718         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2719         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2720 }
2721
2722 /*
2723  * Initialize fields of struct mdt_thread_info. Other fields are left in
2724  * uninitialized state, because it's too expensive to zero out whole
2725  * mdt_thread_info (> 1K) on each request arrival.
2726  */
2727 void mdt_thread_info_init(struct ptlrpc_request *req,
2728                           struct mdt_thread_info *info)
2729 {
2730         int i;
2731
2732         info->mti_pill = &req->rq_pill;
2733
2734         /* lock handle */
2735         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2736                 mdt_lock_handle_init(&info->mti_lh[i]);
2737
2738         /* mdt device: it can be NULL while CONNECT */
2739         if (req->rq_export) {
2740                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2741                 info->mti_exp = req->rq_export;
2742         } else
2743                 info->mti_mdt = NULL;
2744         info->mti_env = req->rq_svc_thread->t_env;
2745         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2746
2747         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2748         info->mti_big_buf = LU_BUF_NULL;
2749         info->mti_body = NULL;
2750         info->mti_object = NULL;
2751         info->mti_dlm_req = NULL;
2752         info->mti_has_trans = 0;
2753         info->mti_cross_ref = 0;
2754         info->mti_opdata = 0;
2755         info->mti_big_lmm_used = 0;
2756
2757         info->mti_spec.no_create = 0;
2758         info->mti_spec.sp_rm_entry = 0;
2759         info->mti_spec.sp_permitted = 0;
2760
2761         info->mti_spec.u.sp_ea.eadata = NULL;
2762         info->mti_spec.u.sp_ea.eadatalen = 0;
2763 }
2764
2765 void mdt_thread_info_fini(struct mdt_thread_info *info)
2766 {
2767         int i;
2768
2769         if (info->mti_object != NULL) {
2770                 mdt_object_put(info->mti_env, info->mti_object);
2771                 info->mti_object = NULL;
2772         }
2773
2774         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2775                 mdt_lock_handle_fini(&info->mti_lh[i]);
2776         info->mti_env = NULL;
2777         info->mti_pill = NULL;
2778         info->mti_exp = NULL;
2779
2780         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2781                 lu_buf_free(&info->mti_big_buf);
2782 }
2783
2784 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2785 {
2786         struct mdt_thread_info  *mti;
2787
2788         mti = mdt_th_info(tsi->tsi_env);
2789         LASSERT(mti != NULL);
2790
2791         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2792         if (tsi->tsi_corpus != NULL) {
2793                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2794                 lu_object_get(tsi->tsi_corpus);
2795         }
2796         mti->mti_body = tsi->tsi_mdt_body;
2797         mti->mti_dlm_req = tsi->tsi_dlm_req;
2798
2799         return mti;
2800 }
2801
2802 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2803 {
2804         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2805         int                      rc;
2806
2807         ENTRY;
2808
2809         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
2810             cfs_fail_val ==
2811             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id) {
2812                 set_current_state(TASK_UNINTERRUPTIBLE);
2813                 schedule_timeout(msecs_to_jiffies(3 * MSEC_PER_SEC));
2814         }
2815
2816         rc = tgt_connect(tsi);
2817         if (rc != 0)
2818                 RETURN(rc);
2819
2820         rc = mdt_init_idmap(tsi);
2821         if (rc != 0)
2822                 GOTO(err, rc);
2823         RETURN(0);
2824 err:
2825         obd_disconnect(class_export_get(req->rq_export));
2826         return rc;
2827 }
2828
2829 enum mdt_it_code {
2830         MDT_IT_OPEN,
2831         MDT_IT_OCREAT,
2832         MDT_IT_CREATE,
2833         MDT_IT_GETATTR,
2834         MDT_IT_READDIR,
2835         MDT_IT_LOOKUP,
2836         MDT_IT_UNLINK,
2837         MDT_IT_TRUNC,
2838         MDT_IT_GETXATTR,
2839         MDT_IT_LAYOUT,
2840         MDT_IT_QUOTA,
2841         MDT_IT_NR
2842 };
2843
2844 static int mdt_intent_getattr(enum mdt_it_code opcode,
2845                               struct mdt_thread_info *info,
2846                               struct ldlm_lock **,
2847                               __u64);
2848
2849 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2850                                 struct mdt_thread_info *info,
2851                                 struct ldlm_lock **lockp,
2852                                 __u64 flags);
2853
2854 static int mdt_intent_layout(enum mdt_it_code opcode,
2855                              struct mdt_thread_info *info,
2856                              struct ldlm_lock **,
2857                              __u64);
2858 static int mdt_intent_reint(enum mdt_it_code opcode,
2859                             struct mdt_thread_info *info,
2860                             struct ldlm_lock **,
2861                             __u64);
2862
2863 static struct mdt_it_flavor {
2864         const struct req_format *it_fmt;
2865         __u32                    it_flags;
2866         int                    (*it_act)(enum mdt_it_code ,
2867                                          struct mdt_thread_info *,
2868                                          struct ldlm_lock **,
2869                                          __u64);
2870         long                     it_reint;
2871 } mdt_it_flavor[] = {
2872         [MDT_IT_OPEN]     = {
2873                 .it_fmt   = &RQF_LDLM_INTENT,
2874                 /*.it_flags = HABEO_REFERO,*/
2875                 .it_flags = 0,
2876                 .it_act   = mdt_intent_reint,
2877                 .it_reint = REINT_OPEN
2878         },
2879         [MDT_IT_OCREAT]   = {
2880                 .it_fmt   = &RQF_LDLM_INTENT,
2881                 /*
2882                  * OCREAT is not a MUTABOR request as if the file
2883                  * already exists.
2884                  * We do the extra check of OBD_CONNECT_RDONLY in
2885                  * mdt_reint_open() when we really need to create
2886                  * the object.
2887                  */
2888                 .it_flags = 0,
2889                 .it_act   = mdt_intent_reint,
2890                 .it_reint = REINT_OPEN
2891         },
2892         [MDT_IT_CREATE]   = {
2893                 .it_fmt   = &RQF_LDLM_INTENT,
2894                 .it_flags = MUTABOR,
2895                 .it_act   = mdt_intent_reint,
2896                 .it_reint = REINT_CREATE
2897         },
2898         [MDT_IT_GETATTR]  = {
2899                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2900                 .it_flags = HABEO_REFERO,
2901                 .it_act   = mdt_intent_getattr
2902         },
2903         [MDT_IT_READDIR]  = {
2904                 .it_fmt   = NULL,
2905                 .it_flags = 0,
2906                 .it_act   = NULL
2907         },
2908         [MDT_IT_LOOKUP]   = {
2909                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2910                 .it_flags = HABEO_REFERO,
2911                 .it_act   = mdt_intent_getattr
2912         },
2913         [MDT_IT_UNLINK]   = {
2914                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2915                 .it_flags = MUTABOR,
2916                 .it_act   = NULL,
2917                 .it_reint = REINT_UNLINK
2918         },
2919         [MDT_IT_TRUNC]    = {
2920                 .it_fmt   = NULL,
2921                 .it_flags = MUTABOR,
2922                 .it_act   = NULL
2923         },
2924         [MDT_IT_GETXATTR] = {
2925                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2926                 .it_flags = HABEO_CORPUS,
2927                 .it_act   = mdt_intent_getxattr
2928         },
2929         [MDT_IT_LAYOUT] = {
2930                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2931                 .it_flags = 0,
2932                 .it_act   = mdt_intent_layout
2933         }
2934 };
2935
2936 static int
2937 mdt_intent_lock_replace(struct mdt_thread_info *info,
2938                         struct ldlm_lock **lockp,
2939                         struct mdt_lock_handle *lh,
2940                         __u64 flags)
2941 {
2942         struct ptlrpc_request  *req = mdt_info_req(info);
2943         struct ldlm_lock       *lock = *lockp;
2944         struct ldlm_lock       *new_lock;
2945
2946         /* If possible resent found a lock, @lh is set to its handle */
2947         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2948
2949         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2950                 lh->mlh_reg_lh.cookie = 0;
2951                 RETURN(0);
2952         }
2953
2954         LASSERTF(new_lock != NULL,
2955                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2956
2957         /*
2958          * If we've already given this lock to a client once, then we should
2959          * have no readers or writers.  Otherwise, we should have one reader
2960          * _or_ writer ref (which will be zeroed below) before returning the
2961          * lock to a client.
2962          */
2963         if (new_lock->l_export == req->rq_export) {
2964                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2965         } else {
2966                 LASSERT(new_lock->l_export == NULL);
2967                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2968         }
2969
2970         *lockp = new_lock;
2971
2972         if (new_lock->l_export == req->rq_export) {
2973                 /*
2974                  * Already gave this to the client, which means that we
2975                  * reconstructed a reply.
2976                  */
2977                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2978                         MSG_RESENT);
2979
2980                 LDLM_LOCK_RELEASE(new_lock);
2981                 lh->mlh_reg_lh.cookie = 0;
2982                 RETURN(ELDLM_LOCK_REPLACED);
2983         }
2984
2985         /*
2986          * Fixup the lock to be given to the client.
2987          */
2988         lock_res_and_lock(new_lock);
2989         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
2990          * possible blocking AST. */
2991         while (new_lock->l_readers > 0) {
2992                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
2993                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2994                 new_lock->l_readers--;
2995         }
2996         while (new_lock->l_writers > 0) {
2997                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
2998                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
2999                 new_lock->l_writers--;
3000         }
3001
3002         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3003         new_lock->l_blocking_ast = lock->l_blocking_ast;
3004         new_lock->l_completion_ast = lock->l_completion_ast;
3005         new_lock->l_remote_handle = lock->l_remote_handle;
3006         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3007
3008         unlock_res_and_lock(new_lock);
3009
3010         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3011                      &new_lock->l_remote_handle,
3012                      &new_lock->l_exp_hash);
3013
3014         LDLM_LOCK_RELEASE(new_lock);
3015         lh->mlh_reg_lh.cookie = 0;
3016
3017         RETURN(ELDLM_LOCK_REPLACED);
3018 }
3019
3020 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3021                                     struct ldlm_lock *new_lock,
3022                                     struct mdt_lock_handle *lh,
3023                                     __u64 flags)
3024 {
3025         struct ptlrpc_request  *req = mdt_info_req(info);
3026         struct ldlm_request    *dlmreq;
3027
3028         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3029                 return;
3030
3031         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3032
3033         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3034          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3035          * initialized. */
3036         if (flags & LDLM_FL_RESENT) {
3037                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3038                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3039
3040                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3041                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie "LPX64,
3042                           lh->mlh_reg_lh.cookie);
3043                 return;
3044         }
3045
3046         /*
3047          * If the xid matches, then we know this is a resent request, and allow
3048          * it. (It's probably an OPEN, for which we don't send a lock.
3049          */
3050         if (req_xid_is_last(req))
3051                 return;
3052
3053         /*
3054          * This remote handle isn't enqueued, so we never received or processed
3055          * this request.  Clear MSG_RESENT, because it can be handled like any
3056          * normal request now.
3057          */
3058         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3059
3060         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3061                   dlmreq->lock_handle[0].cookie);
3062 }
3063
3064 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3065                                 struct mdt_thread_info *info,
3066                                 struct ldlm_lock **lockp,
3067                                 __u64 flags)
3068 {
3069         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3070         struct ldlm_reply      *ldlm_rep = NULL;
3071         int rc, grc;
3072
3073         /*
3074          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3075          * (for the resend case) or a new lock. Below we will use it to
3076          * replace the original lock.
3077          */
3078         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3079         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3080                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3081                 rc = mdt_object_lock(info, info->mti_object, lhc,
3082                                         MDS_INODELOCK_XATTR,
3083                                         MDT_LOCAL_LOCK);
3084                 if (rc)
3085                         return rc;
3086         }
3087
3088         grc = mdt_getxattr(info);
3089
3090         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3091
3092         if (mdt_info_req(info)->rq_repmsg != NULL)
3093                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3094         if (ldlm_rep == NULL)
3095                 RETURN(err_serious(-EFAULT));
3096
3097         ldlm_rep->lock_policy_res2 = grc;
3098
3099         return rc;
3100 }
3101
3102 static int mdt_intent_getattr(enum mdt_it_code opcode,
3103                               struct mdt_thread_info *info,
3104                               struct ldlm_lock **lockp,
3105                               __u64 flags)
3106 {
3107         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3108         __u64                   child_bits;
3109         struct ldlm_reply      *ldlm_rep;
3110         struct mdt_body        *reqbody;
3111         struct mdt_body        *repbody;
3112         int                     rc, rc2;
3113         ENTRY;
3114
3115         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3116         LASSERT(reqbody);
3117
3118         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3119         LASSERT(repbody);
3120
3121         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3122         repbody->mbo_eadatasize = 0;
3123         repbody->mbo_aclsize = 0;
3124
3125         switch (opcode) {
3126         case MDT_IT_LOOKUP:
3127                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3128                 break;
3129         case MDT_IT_GETATTR:
3130                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3131                              MDS_INODELOCK_PERM;
3132                 break;
3133         default:
3134                 CERROR("Unsupported intent (%d)\n", opcode);
3135                 GOTO(out_shrink, rc = -EINVAL);
3136         }
3137
3138         rc = mdt_init_ucred(info, reqbody);
3139         if (rc)
3140                 GOTO(out_shrink, rc);
3141
3142         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3143         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3144
3145         /* Get lock from request for possible resent case. */
3146         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3147
3148         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3149         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3150
3151         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3152                 ldlm_rep->lock_policy_res2 = 0;
3153         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3154             ldlm_rep->lock_policy_res2) {
3155                 lhc->mlh_reg_lh.cookie = 0ull;
3156                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3157         }
3158
3159         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3160         EXIT;
3161 out_ucred:
3162         mdt_exit_ucred(info);
3163 out_shrink:
3164         mdt_client_compatibility(info);
3165         rc2 = mdt_fix_reply(info);
3166         if (rc == 0)
3167                 rc = rc2;
3168         return rc;
3169 }
3170
3171 static int mdt_intent_layout(enum mdt_it_code opcode,
3172                              struct mdt_thread_info *info,
3173                              struct ldlm_lock **lockp,
3174                              __u64 flags)
3175 {
3176         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3177         struct layout_intent *layout;
3178         struct lu_fid *fid;
3179         struct mdt_object *obj = NULL;
3180         int rc = 0;
3181         ENTRY;
3182
3183         if (opcode != MDT_IT_LAYOUT) {
3184                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3185                         opcode);
3186                 RETURN(-EINVAL);
3187         }
3188
3189         fid = &info->mti_tmp_fid2;
3190         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3191
3192         /* Get lock from request for possible resent case. */
3193         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3194
3195         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3196         if (IS_ERR(obj))
3197                 RETURN(PTR_ERR(obj));
3198
3199         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3200                 /* get the length of lsm */
3201                 rc = mdt_attr_get_eabuf_size(info, obj);
3202                 if (rc < 0) {
3203                         mdt_object_put(info->mti_env, obj);
3204                         RETURN(rc);
3205                 }
3206
3207                 if (rc > info->mti_mdt->mdt_max_mdsize)
3208                         info->mti_mdt->mdt_max_mdsize = rc;
3209         }
3210
3211         mdt_object_put(info->mti_env, obj);
3212
3213         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3214         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER, rc);
3215         rc = req_capsule_server_pack(info->mti_pill);
3216         if (rc != 0)
3217                 RETURN(-EINVAL);
3218
3219         if (lustre_handle_is_used(&lhc->mlh_reg_lh))
3220                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3221
3222         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3223         LASSERT(layout != NULL);
3224         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3225                 /* return to normal/resent ldlm handling */
3226                 RETURN(rc);
3227
3228         CERROR("%s: Unsupported layout intent (%d)\n",
3229                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3230         RETURN(-EINVAL);
3231 }
3232
3233 static int mdt_intent_reint(enum mdt_it_code opcode,
3234                             struct mdt_thread_info *info,
3235                             struct ldlm_lock **lockp,
3236                             __u64 flags)
3237 {
3238         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3239         struct ldlm_reply      *rep = NULL;
3240         long                    opc;
3241         int                     rc;
3242
3243         static const struct req_format *intent_fmts[REINT_MAX] = {
3244                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3245                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3246         };
3247
3248         ENTRY;
3249
3250         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3251         if (opc < 0)
3252                 RETURN(opc);
3253
3254         if (mdt_it_flavor[opcode].it_reint != opc) {
3255                 CERROR("Reint code %ld doesn't match intent: %d\n",
3256                        opc, opcode);
3257                 RETURN(err_serious(-EPROTO));
3258         }
3259
3260         /* Get lock from request for possible resent case. */
3261         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3262
3263         rc = mdt_reint_internal(info, lhc, opc);
3264
3265         /* Check whether the reply has been packed successfully. */
3266         if (mdt_info_req(info)->rq_repmsg != NULL)
3267                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3268         if (rep == NULL)
3269                 RETURN(err_serious(-EFAULT));
3270
3271         /* MDC expects this in any case */
3272         if (rc != 0)
3273                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3274
3275         /* the open lock or the lock for cross-ref object should be
3276          * returned to the client */
3277         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3278             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3279                 rep->lock_policy_res2 = 0;
3280                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3281                 RETURN(rc);
3282         }
3283
3284         rep->lock_policy_res2 = clear_serious(rc);
3285
3286         if (rep->lock_policy_res2 == -ENOENT &&
3287             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3288                 rep->lock_policy_res2 = 0;
3289
3290         lhc->mlh_reg_lh.cookie = 0ull;
3291         if (rc == -ENOTCONN || rc == -ENODEV ||
3292             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3293                 /*
3294                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3295                  * will be returned by rq_status, and client at ptlrpc layer
3296                  * will detect this, then disconnect, reconnect the import
3297                  * immediately, instead of impacting the following the rpc.
3298                  */
3299                 RETURN(rc);
3300         }
3301         /*
3302          * For other cases, the error will be returned by intent, and client
3303          * will retrieve the result from intent.
3304          */
3305         RETURN(ELDLM_LOCK_ABORTED);
3306 }
3307
3308 static int mdt_intent_code(long itcode)
3309 {
3310         int rc;
3311
3312         switch(itcode) {
3313         case IT_OPEN:
3314                 rc = MDT_IT_OPEN;
3315                 break;
3316         case IT_OPEN|IT_CREAT:
3317                 rc = MDT_IT_OCREAT;
3318                 break;
3319         case IT_CREAT:
3320                 rc = MDT_IT_CREATE;
3321                 break;
3322         case IT_READDIR:
3323                 rc = MDT_IT_READDIR;
3324                 break;
3325         case IT_GETATTR:
3326                 rc = MDT_IT_GETATTR;
3327                 break;
3328         case IT_LOOKUP:
3329                 rc = MDT_IT_LOOKUP;
3330                 break;
3331         case IT_UNLINK:
3332                 rc = MDT_IT_UNLINK;
3333                 break;
3334         case IT_TRUNC:
3335                 rc = MDT_IT_TRUNC;
3336                 break;
3337         case IT_GETXATTR:
3338                 rc = MDT_IT_GETXATTR;
3339                 break;
3340         case IT_LAYOUT:
3341                 rc = MDT_IT_LAYOUT;
3342                 break;
3343         case IT_QUOTA_DQACQ:
3344         case IT_QUOTA_CONN:
3345                 rc = MDT_IT_QUOTA;
3346                 break;
3347         default:
3348                 CERROR("Unknown intent opcode: %ld\n", itcode);
3349                 rc = -EINVAL;
3350                 break;
3351         }
3352         return rc;
3353 }
3354
3355 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3356                           struct ldlm_lock **lockp, __u64 flags)
3357 {
3358         struct req_capsule      *pill = info->mti_pill;
3359         struct ptlrpc_request   *req = mdt_info_req(info);
3360         struct mdt_it_flavor    *flv;
3361         int opc;
3362         int rc;
3363         ENTRY;
3364
3365         opc = mdt_intent_code(itopc);
3366         if (opc < 0)
3367                 RETURN(-EINVAL);
3368
3369         if (opc == MDT_IT_QUOTA) {
3370                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3371
3372                 if (qmt == NULL)
3373                         RETURN(-EOPNOTSUPP);
3374
3375                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3376                 /* pass the request to quota master */
3377                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3378                                                  mdt_info_req(info), lockp,
3379                                                  flags);
3380                 RETURN(rc);
3381         }
3382
3383         flv = &mdt_it_flavor[opc];
3384         if (flv->it_fmt != NULL)
3385                 req_capsule_extend(pill, flv->it_fmt);
3386
3387         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3388         if (rc < 0)
3389                 RETURN(rc);
3390
3391         if (flv->it_flags & MUTABOR &&
3392             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3393                 RETURN(-EROFS);
3394
3395         if (flv->it_act != NULL) {
3396                 struct ldlm_reply *rep;
3397
3398                 /* execute policy */
3399                 rc = flv->it_act(opc, info, lockp, flags);
3400
3401                 /* Check whether the reply has been packed successfully. */
3402                 if (req->rq_repmsg != NULL) {
3403                         rep = req_capsule_server_get(info->mti_pill,
3404                                                      &RMF_DLM_REP);
3405                         rep->lock_policy_res2 =
3406                                 ptlrpc_status_hton(rep->lock_policy_res2);
3407                 }
3408         }
3409
3410         RETURN(rc);
3411 }
3412
3413 static int mdt_intent_policy(struct ldlm_namespace *ns,
3414                              struct ldlm_lock **lockp, void *req_cookie,
3415                              ldlm_mode_t mode, __u64 flags, void *data)
3416 {
3417         struct tgt_session_info *tsi;
3418         struct mdt_thread_info  *info;
3419         struct ptlrpc_request   *req  =  req_cookie;
3420         struct ldlm_intent      *it;
3421         struct req_capsule      *pill;
3422         int rc;
3423
3424         ENTRY;
3425
3426         LASSERT(req != NULL);
3427
3428         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3429
3430         info = tsi2mdt_info(tsi);
3431         LASSERT(info != NULL);
3432         pill = info->mti_pill;
3433         LASSERT(pill->rc_req == req);
3434
3435         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3436                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3437                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3438                 if (it != NULL) {
3439                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3440                         if (rc == 0)
3441                                 rc = ELDLM_OK;
3442
3443                         /* Lock without inodebits makes no sense and will oops
3444                          * later in ldlm. Let's check it now to see if we have
3445                          * ibits corrupted somewhere in mdt_intent_opc().
3446                          * The case for client miss to set ibits has been
3447                          * processed by others. */
3448                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3449                                         lr_type == LDLM_IBITS,
3450                                      info->mti_dlm_req->lock_desc.\
3451                                         l_policy_data.l_inodebits.bits != 0));
3452                 } else
3453                         rc = err_serious(-EFAULT);
3454         } else {
3455                 /* No intent was provided */
3456                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3457                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3458                 rc = req_capsule_server_pack(pill);
3459                 if (rc)
3460                         rc = err_serious(rc);
3461         }
3462         mdt_thread_info_fini(info);
3463         RETURN(rc);
3464 }
3465
3466 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3467 {
3468         struct seq_server_site  *ss = mdt_seq_site(mdt);
3469
3470         if (ss->ss_node_id == 0)
3471                 return;
3472
3473         if (ss->ss_client_seq != NULL) {
3474                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3475                 ss->ss_client_seq->lcs_exp = NULL;
3476         }
3477
3478         if (ss->ss_server_fld != NULL) {
3479                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3480                 ss->ss_server_fld->lsf_control_exp = NULL;
3481         }
3482 }
3483
3484 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3485 {
3486         struct seq_server_site *ss = mdt_seq_site(mdt);
3487
3488         if (ss == NULL)
3489                 return;
3490
3491         if (ss->ss_server_seq != NULL)
3492                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3493 }
3494
3495 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3496 {
3497         mdt_seq_fini_cli(mdt);
3498         mdt_deregister_seq_exp(mdt);
3499
3500         return seq_site_fini(env, mdt_seq_site(mdt));
3501 }
3502
3503 /**
3504  * It will retrieve its FLDB entries from MDT0, and it only happens
3505  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3506  * and it needs to refresh FLDB from the MDT0.
3507  **/
3508 static int mdt_register_lwp_callback(void *data)
3509 {
3510         struct lu_env           env;
3511         struct mdt_device       *mdt = data;
3512         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3513         int                     rc;
3514         ENTRY;
3515
3516         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3517
3518         if (!likely(fld->lsf_new))
3519                 RETURN(0);
3520
3521         rc = lu_env_init(&env, LCT_MD_THREAD);
3522         if (rc) {
3523                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3524                 RETURN(rc);
3525         }
3526
3527         rc = fld_update_from_controller(&env, fld);
3528         if (rc != 0) {
3529                 CERROR("%s: cannot update controller: rc = %d\n",
3530                        mdt_obd_name(mdt), rc);
3531                 GOTO(out, rc);
3532         }
3533 out:
3534         lu_env_fini(&env);
3535         RETURN(rc);
3536 }
3537
3538 static int mdt_register_seq_exp(struct mdt_device *mdt)
3539 {
3540         struct seq_server_site  *ss = mdt_seq_site(mdt);
3541         char                    *lwp_name = NULL;
3542         int                     rc;
3543
3544         if (ss->ss_node_id == 0)
3545                 return 0;
3546
3547         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3548         if (lwp_name == NULL)
3549                 GOTO(out_free, rc = -ENOMEM);
3550
3551         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3552         if (rc != 0)
3553                 GOTO(out_free, rc);
3554
3555         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3556                                       NULL, NULL);
3557         if (rc != 0)
3558                 GOTO(out_free, rc);
3559
3560         rc = lustre_register_lwp_item(lwp_name,
3561                                       &ss->ss_server_fld->lsf_control_exp,
3562                                       mdt_register_lwp_callback, mdt);
3563         if (rc != 0) {
3564                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3565                 ss->ss_client_seq->lcs_exp = NULL;
3566                 GOTO(out_free, rc);
3567         }
3568 out_free:
3569         if (lwp_name != NULL)
3570                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3571
3572         return rc;
3573 }
3574
3575 /*
3576  * Init client sequence manager which is used by local MDS to talk to sequence
3577  * controller on remote node.
3578  */
3579 static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
3580 {
3581         struct seq_server_site  *ss = mdt_seq_site(mdt);
3582         int                     rc;
3583         char                    *prefix;
3584         ENTRY;
3585
3586         /* check if this is adding the first MDC and controller is not yet
3587          * initialized. */
3588         OBD_ALLOC_PTR(ss->ss_client_seq);
3589         if (ss->ss_client_seq == NULL)
3590                 RETURN(-ENOMEM);
3591
3592         OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
3593         if (prefix == NULL) {
3594                 OBD_FREE_PTR(ss->ss_client_seq);
3595                 ss->ss_client_seq = NULL;
3596                 RETURN(-ENOMEM);
3597         }
3598
3599         /* Note: seq_client_fini will be called in seq_site_fini */
3600         snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
3601         rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
3602                              prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
3603                                                             NULL);
3604         OBD_FREE(prefix, MAX_OBD_NAME + 5);
3605         if (rc != 0) {
3606                 OBD_FREE_PTR(ss->ss_client_seq);
3607                 ss->ss_client_seq = NULL;
3608                 RETURN(rc);
3609         }
3610
3611         rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
3612
3613         RETURN(rc);
3614 }
3615
3616 static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
3617 {
3618         struct seq_server_site  *ss;
3619         int                     rc;
3620         ENTRY;
3621
3622         ss = mdt_seq_site(mdt);
3623         /* init sequence controller server(MDT0) */
3624         if (ss->ss_node_id == 0) {
3625                 OBD_ALLOC_PTR(ss->ss_control_seq);
3626                 if (ss->ss_control_seq == NULL)
3627                         RETURN(-ENOMEM);
3628
3629                 rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
3630                                      mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
3631                                      ss);
3632                 if (rc)
3633                         GOTO(out_seq_fini, rc);
3634         }
3635
3636         /* Init normal sequence server */
3637         OBD_ALLOC_PTR(ss->ss_server_seq);
3638         if (ss->ss_server_seq == NULL)
3639                 GOTO(out_seq_fini, rc = -ENOMEM);
3640
3641         rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
3642                              mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
3643         if (rc)
3644                 GOTO(out_seq_fini, rc);
3645
3646         /* init seq client for seq server to talk to seq controller(MDT0) */
3647         rc = mdt_seq_init_cli(env, mdt);
3648         if (rc != 0)
3649                 GOTO(out_seq_fini, rc);
3650
3651         if (ss->ss_node_id != 0)
3652                 /* register controller export through lwp */
3653                 rc = mdt_register_seq_exp(mdt);
3654
3655         EXIT;
3656 out_seq_fini:
3657         if (rc)
3658                 mdt_seq_fini(env, mdt);
3659
3660         return rc;
3661 }
3662
3663 /*
3664  * FLD wrappers
3665  */
3666 static int mdt_fld_fini(const struct lu_env *env,
3667                         struct mdt_device *m)
3668 {
3669         struct seq_server_site *ss = mdt_seq_site(m);
3670         ENTRY;
3671
3672         if (ss && ss->ss_server_fld) {
3673                 fld_server_fini(env, ss->ss_server_fld);
3674                 OBD_FREE_PTR(ss->ss_server_fld);
3675                 ss->ss_server_fld = NULL;
3676         }
3677
3678         RETURN(0);
3679 }
3680
3681 static int mdt_fld_init(const struct lu_env *env,
3682                         const char *uuid,
3683                         struct mdt_device *m)
3684 {
3685         struct seq_server_site *ss;
3686         int rc;
3687         ENTRY;
3688
3689         ss = mdt_seq_site(m);
3690
3691         OBD_ALLOC_PTR(ss->ss_server_fld);
3692         if (ss->ss_server_fld == NULL)
3693                 RETURN(rc = -ENOMEM);
3694
3695         rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
3696                              LU_SEQ_RANGE_MDT);
3697         if (rc) {
3698                 OBD_FREE_PTR(ss->ss_server_fld);
3699                 ss->ss_server_fld = NULL;
3700                 RETURN(rc);
3701         }
3702
3703         RETURN(0);
3704 }
3705
3706 static void mdt_stack_pre_fini(const struct lu_env *env,
3707                            struct mdt_device *m, struct lu_device *top)
3708 {
3709         struct lustre_cfg_bufs  *bufs;
3710         struct lustre_cfg       *lcfg;
3711         struct mdt_thread_info  *info;
3712         ENTRY;
3713
3714         LASSERT(top);
3715
3716         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3717         LASSERT(info != NULL);
3718
3719         bufs = &info->mti_u.bufs;
3720
3721         LASSERT(m->mdt_child_exp);
3722         LASSERT(m->mdt_child_exp->exp_obd);
3723
3724         /* process cleanup, pass mdt obd name to get obd umount flags */
3725         /* XXX: this is needed because all layers are referenced by
3726          * objects (some of them are pinned by osd, for example *
3727          * the proper solution should be a model where object used
3728          * by osd only doesn't have mdt/mdd slices -bzzz */
3729         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3730         lustre_cfg_bufs_set_string(bufs, 1, NULL);
3731         lcfg = lustre_cfg_new(LCFG_PRE_CLEANUP, bufs);
3732         if (lcfg == NULL)
3733                 RETURN_EXIT;
3734
3735         top->ld_ops->ldo_process_config(env, top, lcfg);
3736         lustre_cfg_free(lcfg);
3737         EXIT;
3738 }
3739
3740 static void mdt_stack_fini(const struct lu_env *env,
3741                            struct mdt_device *m, struct lu_device *top)
3742 {
3743         struct obd_device       *obd = mdt2obd_dev(m);
3744         struct lustre_cfg_bufs  *bufs;
3745         struct lustre_cfg       *lcfg;
3746         struct mdt_thread_info  *info;
3747         char                     flags[3] = "";
3748         ENTRY;
3749
3750         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
3751         LASSERT(info != NULL);
3752
3753         lu_dev_del_linkage(top->ld_site, top);
3754
3755         lu_site_purge(env, top->ld_site, -1);
3756
3757         bufs = &info->mti_u.bufs;
3758         /* process cleanup, pass mdt obd name to get obd umount flags */
3759         /* another purpose is to let all layers to release their objects */
3760         lustre_cfg_bufs_reset(bufs, mdt_obd_name(m));
3761         if (obd->obd_force)
3762                 strcat(flags, "F");
3763         if (obd->obd_fail)
3764                 strcat(flags, "A");
3765         lustre_cfg_bufs_set_string(bufs, 1, flags);
3766         lcfg = lustre_cfg_new(LCFG_CLEANUP, bufs);
3767         if (lcfg == NULL)
3768                 RETURN_EXIT;
3769
3770         LASSERT(top);
3771         top->ld_ops->ldo_process_config(env, top, lcfg);
3772         lustre_cfg_free(lcfg);
3773
3774         lu_site_purge(env, top->ld_site, -1);
3775
3776         m->mdt_child = NULL;
3777         m->mdt_bottom = NULL;
3778
3779         obd_disconnect(m->mdt_child_exp);
3780         m->mdt_child_exp = NULL;
3781
3782         obd_disconnect(m->mdt_bottom_exp);
3783         m->mdt_child_exp = NULL;
3784 }
3785
3786 static int mdt_connect_to_next(const struct lu_env *env, struct mdt_device *m,
3787                                const char *next, struct obd_export **exp)
3788 {
3789         struct obd_connect_data *data = NULL;
3790         struct obd_device       *obd;
3791         int                      rc;
3792         ENTRY;
3793
3794         OBD_ALLOC_PTR(data);
3795         if (data == NULL)
3796                 GOTO(out, rc = -ENOMEM);
3797
3798         obd = class_name2obd(next);
3799         if (obd == NULL) {
3800                 CERROR("%s: can't locate next device: %s\n",
3801                        mdt_obd_name(m), next);
3802                 GOTO(out, rc = -ENOTCONN);
3803         }
3804
3805         data->ocd_connect_flags = OBD_CONNECT_VERSION;
3806         data->ocd_version = LUSTRE_VERSION_CODE;
3807
3808         rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
3809         if (rc) {
3810                 CERROR("%s: cannot connect to next dev %s (%d)\n",
3811                        mdt_obd_name(m), next, rc);
3812                 GOTO(out, rc);
3813         }
3814
3815 out:
3816         if (data)
3817                 OBD_FREE_PTR(data);
3818         RETURN(rc);
3819 }
3820
3821 static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
3822                           struct lustre_cfg *cfg)
3823 {
3824         char                   *dev = lustre_cfg_string(cfg, 0);
3825         int                     rc, name_size, uuid_size;
3826         char                   *name, *uuid, *p;
3827         struct lustre_cfg_bufs *bufs;
3828         struct lustre_cfg      *lcfg;
3829         struct obd_device      *obd;
3830         struct lustre_profile  *lprof;
3831         struct lu_site         *site;
3832         ENTRY;
3833
3834         /* in 1.8 we had the only device in the stack - MDS.
3835          * 2.0 introduces MDT, MDD, OSD; MDT starts others internally.
3836          * in 2.3 OSD is instantiated by obd_mount.c, so we need
3837          * to generate names and setup MDT, MDD. MDT will be using
3838          * generated name to connect to MDD. for MDD the next device
3839          * will be LOD with name taken from so called "profile" which
3840          * is generated by mount_option line
3841          *
3842          * 1.8 MGS generates config. commands like this:
3843          *   #06 (104)mount_option 0:  1:lustre-MDT0000  2:lustre-mdtlov
3844          *   #08 (120)setup   0:lustre-MDT0000  1:dev 2:type 3:lustre-MDT0000
3845          * 2.0 MGS generates config. commands like this:
3846          *   #07 (112)mount_option 0:  1:lustre-MDT0000  2:lustre-MDT0000-mdtlov
3847          *   #08 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3848          *                    3:lustre-MDT0000-mdtlov  4:f
3849          *
3850          * we generate MDD name from MDT one, just replacing T with D
3851          *
3852          * after all the preparations, the logical equivalent will be
3853          *   #01 (160)setup   0:lustre-MDD0000  1:lustre-MDD0000_UUID  2:0
3854          *                    3:lustre-MDT0000-mdtlov  4:f
3855          *   #02 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3856          *                    3:lustre-MDD0000  4:f
3857          *
3858          *  notice we build the stack from down to top: MDD first, then MDT */
3859
3860         name_size = MAX_OBD_NAME;
3861         uuid_size = MAX_OBD_NAME;
3862
3863         OBD_ALLOC(name, name_size);
3864         OBD_ALLOC(uuid, uuid_size);
3865         if (name == NULL || uuid == NULL)
3866                 GOTO(cleanup_mem, rc = -ENOMEM);
3867
3868         OBD_ALLOC_PTR(bufs);
3869         if (!bufs)
3870                 GOTO(cleanup_mem, rc = -ENOMEM);
3871
3872         strcpy(name, dev);
3873         p = strstr(name, "-MDT");
3874         if (p == NULL)
3875                 GOTO(free_bufs, rc = -ENOMEM);
3876         p[3] = 'D';
3877
3878         snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
3879
3880         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
3881         if (lprof == NULL || lprof->lp_dt == NULL) {
3882                 CERROR("can't find the profile: %s\n",
3883                        lustre_cfg_string(cfg, 0));
3884                 GOTO(free_bufs, rc = -EINVAL);
3885         }
3886
3887         lustre_cfg_bufs_reset(bufs, name);
3888         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_MDD_NAME);
3889         lustre_cfg_bufs_set_string(bufs, 2, uuid);
3890         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3891
3892         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
3893         if (lcfg == NULL)
3894                 GOTO(free_bufs, rc = -ENOMEM);
3895
3896         rc = class_attach(lcfg);
3897         if (rc)
3898                 GOTO(lcfg_cleanup, rc);
3899
3900         obd = class_name2obd(name);
3901         if (!obd) {
3902                 CERROR("Can not find obd %s (%s in config)\n",
3903                        MDD_OBD_NAME, lustre_cfg_string(cfg, 0));
3904                 GOTO(lcfg_cleanup, rc = -EINVAL);
3905         }
3906
3907         lustre_cfg_free(lcfg);
3908
3909         lustre_cfg_bufs_reset(bufs, name);
3910         lustre_cfg_bufs_set_string(bufs, 1, uuid);
3911         lustre_cfg_bufs_set_string(bufs, 2, dev);
3912         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
3913
3914         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
3915         if (lcfg == NULL)
3916                 GOTO(class_detach, rc = -ENOMEM);
3917
3918         rc = class_setup(obd, lcfg);
3919         if (rc)
3920                 GOTO(class_detach, rc);
3921
3922         /* connect to MDD we just setup */
3923         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
3924         if (rc)
3925                 GOTO(class_detach, rc);
3926
3927         site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
3928         LASSERT(site);
3929         LASSERT(mdt_lu_site(mdt) == NULL);
3930         mdt->mdt_lu_dev.ld_site = site;
3931         site->ls_top_dev = &mdt->mdt_lu_dev;
3932         mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
3933
3934         /* now connect to bottom OSD */
3935         snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
3936         rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
3937         if (rc)
3938                 GOTO(class_detach, rc);
3939         mdt->mdt_bottom =
3940                 lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
3941
3942         rc = lu_env_refill((struct lu_env *)env);
3943         if (rc != 0)
3944                 CERROR("Failure to refill session: '%d'\n", rc);
3945
3946         lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
3947
3948         EXIT;
3949 class_detach:
3950         if (rc)
3951                 class_detach(obd, lcfg);
3952 lcfg_cleanup:
3953         lustre_cfg_free(lcfg);
3954 free_bufs:
3955         OBD_FREE_PTR(bufs);
3956 cleanup_mem:
3957         if (name)
3958                 OBD_FREE(name, name_size);
3959         if (uuid)
3960                 OBD_FREE(uuid, uuid_size);
3961         RETURN(rc);
3962 }
3963
3964 /* setup quota master target on MDT0 */
3965 static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
3966                           struct lustre_cfg *cfg)
3967 {
3968         struct obd_device       *obd;
3969         char                    *dev = lustre_cfg_string(cfg, 0);
3970         char                    *qmtname, *uuid, *p;
3971         struct lustre_cfg_bufs  *bufs;
3972         struct lustre_cfg       *lcfg;
3973         struct lustre_profile   *lprof;
3974         struct obd_connect_data *data;
3975         int                      rc;
3976         ENTRY;
3977
3978         LASSERT(mdt->mdt_qmt_exp == NULL);
3979         LASSERT(mdt->mdt_qmt_dev == NULL);
3980
3981         /* quota master is on MDT0 only for now */
3982         if (mdt->mdt_seq_site.ss_node_id != 0)
3983                 RETURN(0);
3984
3985         /* MGS generates config commands which look as follows:
3986          *   #01 (160)setup   0:lustre-MDT0000  1:lustre-MDT0000_UUID  2:0
3987          *                    3:lustre-MDT0000-mdtlov  4:f
3988          *
3989          * We generate the QMT name from the MDT one, just replacing MD with QM
3990          * after all the preparations, the logical equivalent will be:
3991          *   #01 (160)setup   0:lustre-QMT0000  1:lustre-QMT0000_UUID  2:0
3992          *                    3:lustre-MDT0000-osd  4:f */
3993         OBD_ALLOC(qmtname, MAX_OBD_NAME);
3994         OBD_ALLOC(uuid, UUID_MAX);
3995         OBD_ALLOC_PTR(bufs);
3996         OBD_ALLOC_PTR(data);
3997         if (qmtname == NULL || uuid == NULL || bufs == NULL || data == NULL)
3998                 GOTO(cleanup_mem, rc = -ENOMEM);
3999
4000         strcpy(qmtname, dev);
4001         p = strstr(qmtname, "-MDT");
4002         if (p == NULL)
4003                 GOTO(cleanup_mem, rc = -ENOMEM);
4004         /* replace MD with QM */
4005         p[1] = 'Q';
4006         p[2] = 'M';
4007
4008         snprintf(uuid, UUID_MAX, "%s_UUID", qmtname);
4009
4010         lprof = class_get_profile(lustre_cfg_string(cfg, 0));
4011         if (lprof == NULL || lprof->lp_dt == NULL) {
4012                 CERROR("can't find profile for %s\n",
4013                        lustre_cfg_string(cfg, 0));
4014                 GOTO(cleanup_mem, rc = -EINVAL);
4015         }
4016
4017         lustre_cfg_bufs_reset(bufs, qmtname);
4018         lustre_cfg_bufs_set_string(bufs, 1, LUSTRE_QMT_NAME);
4019         lustre_cfg_bufs_set_string(bufs, 2, uuid);
4020         lustre_cfg_bufs_set_string(bufs, 3, lprof->lp_dt);
4021
4022         lcfg = lustre_cfg_new(LCFG_ATTACH, bufs);
4023         if (lcfg == NULL)
4024                 GOTO(cleanup_mem, rc = -ENOMEM);
4025
4026         rc = class_attach(lcfg);
4027         if (rc)
4028                 GOTO(lcfg_cleanup, rc);
4029
4030         obd = class_name2obd(qmtname);
4031         if (!obd) {
4032                 CERROR("Can not find obd %s (%s in config)\n", qmtname,
4033                        lustre_cfg_string(cfg, 0));
4034                 GOTO(lcfg_cleanup, rc = -EINVAL);
4035         }
4036
4037         lustre_cfg_free(lcfg);
4038
4039         lustre_cfg_bufs_reset(bufs, qmtname);
4040         lustre_cfg_bufs_set_string(bufs, 1, uuid);
4041         lustre_cfg_bufs_set_string(bufs, 2, dev);
4042
4043         /* for quota, the next device should be the OSD device */
4044         lustre_cfg_bufs_set_string(bufs, 3,
4045                                    mdt->mdt_bottom->dd_lu_dev.ld_obd->obd_name);
4046
4047         lcfg = lustre_cfg_new(LCFG_SETUP, bufs);
4048         if (lcfg == NULL)
4049                 GOTO(class_detach, rc = -ENOMEM);
4050
4051         rc = class_setup(obd, lcfg);
4052         if (rc)
4053                 GOTO(class_detach, rc);
4054
4055         mdt->mdt_qmt_dev = obd->obd_lu_dev;
4056
4057         /* configure local quota objects */
4058         rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
4059                                                    &mdt->mdt_lu_dev,
4060                                                    mdt->mdt_qmt_dev);
4061         if (rc)
4062                 GOTO(class_cleanup, rc);
4063
4064         /* connect to quota master target */
4065         data->ocd_connect_flags = OBD_CONNECT_VERSION;
4066         data->ocd_version = LUSTRE_VERSION_CODE;
4067         rc = obd_connect(NULL, &mdt->mdt_qmt_exp, obd, &obd->obd_uuid,
4068                          data, NULL);
4069         if (rc) {
4070                 CERROR("cannot connect to quota master device %s (%d)\n",
4071                        qmtname, rc);
4072                 GOTO(class_cleanup, rc);
4073         }
4074
4075         EXIT;
4076 class_cleanup:
4077         if (rc) {
4078                 class_manual_cleanup(obd);
4079                 mdt->mdt_qmt_dev = NULL;
4080         }
4081 class_detach:
4082         if (rc)
4083                 class_detach(obd, lcfg);
4084 lcfg_cleanup:
4085         lustre_cfg_free(lcfg);
4086 cleanup_mem:
4087         if (bufs)
4088                 OBD_FREE_PTR(bufs);
4089         if (qmtname)
4090                 OBD_FREE(qmtname, MAX_OBD_NAME);
4091         if (uuid)
4092                 OBD_FREE(uuid, UUID_MAX);
4093         if (data)
4094                 OBD_FREE_PTR(data);
4095         return rc;
4096 }
4097
4098 /* Shutdown quota master target associated with mdt */
4099 static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
4100 {
4101         ENTRY;
4102
4103         if (mdt->mdt_qmt_exp == NULL)
4104                 RETURN_EXIT;
4105         LASSERT(mdt->mdt_qmt_dev != NULL);
4106
4107         /* the qmt automatically shuts down when the mdt disconnects */
4108         obd_disconnect(mdt->mdt_qmt_exp);
4109         mdt->mdt_qmt_exp = NULL;
4110         mdt->mdt_qmt_dev = NULL;
4111         EXIT;
4112 }
4113
4114 /* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
4115  * for now. This will be removed along with converting rest of MDT code
4116  * to use tgt_session_info */
4117 static int mdt_tgt_getxattr(struct tgt_session_info *tsi)
4118 {
4119         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
4120         int                      rc;
4121
4122         rc = mdt_getxattr(info);
4123
4124         mdt_thread_info_fini(info);
4125         return rc;
4126 }
4127
4128 static struct tgt_handler mdt_tgt_handlers[] = {
4129 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4130                 0,                      MDS_CONNECT,    mdt_tgt_connect,
4131                 &RQF_CONNECT, LUSTRE_OBD_VERSION),
4132 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4133                 0,                      MDS_DISCONNECT, tgt_disconnect,
4134                 &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
4135 TGT_RPC_HANDLER(MDS_FIRST_OPC,
4136                 HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
4137                 &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
4138 TGT_MDT_HDL(0,                          MDS_GET_INFO,   mdt_get_info),
4139 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
4140 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETATTR,    mdt_getattr),
4141 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_GETATTR_NAME,
4142                                                         mdt_getattr_name),
4143 TGT_MDT_HDL(HABEO_CORPUS,               MDS_GETXATTR,   mdt_tgt_getxattr),
4144 TGT_MDT_HDL(0           | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
4145 TGT_MDT_HDL(0           | MUTABOR,      MDS_REINT,      mdt_reint),
4146 TGT_MDT_HDL(HABEO_CORPUS,               MDS_CLOSE,      mdt_close),
4147 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_READPAGE,   mdt_readpage),
4148 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_SYNC,       mdt_sync),
4149 TGT_MDT_HDL(0,                          MDS_QUOTACTL,   mdt_quotactl),
4150 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
4151                                                         mdt_hsm_progress),
4152 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
4153                                                         mdt_hsm_ct_register),
4154 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
4155                                                         mdt_hsm_ct_unregister),
4156 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
4157                                                         mdt_hsm_state_get),
4158 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
4159                                                         mdt_hsm_state_set),
4160 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION, mdt_hsm_action),
4161 TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
4162                                                         mdt_hsm_request),
4163 TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
4164             MDS_SWAP_LAYOUTS,
4165             mdt_swap_layouts),
4166 };
4167
4168 static struct tgt_handler mdt_sec_ctx_ops[] = {
4169 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT,     mdt_sec_ctx_handle),
4170 TGT_SEC_HDL_VAR(0,                      SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
4171 TGT_SEC_HDL_VAR(0,                      SEC_CTX_FINI,     mdt_sec_ctx_handle)
4172 };
4173
4174 static struct tgt_handler mdt_quota_ops[] = {
4175 TGT_QUOTA_HDL(HABEO_REFERO,             QUOTA_DQACQ,      mdt_quota_dqacq),
4176 };
4177
4178 static struct tgt_opc_slice mdt_common_slice[] = {
4179         {
4180                 .tos_opc_start  = MDS_FIRST_OPC,
4181                 .tos_opc_end    = MDS_LAST_OPC,
4182                 .tos_hs         = mdt_tgt_handlers
4183         },
4184         {
4185                 .tos_opc_start  = OBD_FIRST_OPC,
4186                 .tos_opc_end    = OBD_LAST_OPC,
4187                 .tos_hs         = tgt_obd_handlers
4188         },
4189         {
4190                 .tos_opc_start  = LDLM_FIRST_OPC,
4191                 .tos_opc_end    = LDLM_LAST_OPC,
4192                 .tos_hs         = tgt_dlm_handlers
4193         },
4194         {
4195                 .tos_opc_start  = SEC_FIRST_OPC,
4196                 .tos_opc_end    = SEC_LAST_OPC,
4197                 .tos_hs         = mdt_sec_ctx_ops
4198         },
4199         {
4200                 .tos_opc_start  = OUT_UPDATE_FIRST_OPC,
4201                 .tos_opc_end    = OUT_UPDATE_LAST_OPC,
4202                 .tos_hs         = tgt_out_handlers
4203         },
4204         {
4205                 .tos_opc_start  = FLD_FIRST_OPC,
4206                 .tos_opc_end    = FLD_LAST_OPC,
4207                 .tos_hs         = fld_handlers
4208         },
4209         {
4210                 .tos_opc_start  = SEQ_FIRST_OPC,
4211                 .tos_opc_end    = SEQ_LAST_OPC,
4212                 .tos_hs         = seq_handlers
4213         },
4214         {
4215                 .tos_opc_start  = QUOTA_DQACQ,
4216                 .tos_opc_end    = QUOTA_LAST_OPC,
4217                 .tos_hs         = mdt_quota_ops
4218         },
4219         {
4220                 .tos_opc_start  = LLOG_FIRST_OPC,
4221                 .tos_opc_end    = LLOG_LAST_OPC,
4222                 .tos_hs         = tgt_llog_handlers
4223         },
4224         {
4225                 .tos_opc_start  = LFSCK_FIRST_OPC,
4226                 .tos_opc_end    = LFSCK_LAST_OPC,
4227                 .tos_hs         = tgt_lfsck_handlers
4228         },
4229
4230         {
4231                 .tos_hs         = NULL
4232         }
4233 };
4234
4235 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
4236 {
4237         struct md_device        *next = m->mdt_child;
4238         struct lu_device        *d    = &m->mdt_lu_dev;
4239         struct obd_device       *obd  = mdt2obd_dev(m);
4240         struct lfsck_stop        stop;
4241         ENTRY;
4242
4243         stop.ls_status = LS_PAUSED;
4244         stop.ls_flags = 0;
4245         next->md_ops->mdo_iocontrol(env, next, OBD_IOC_STOP_LFSCK, 0, &stop);
4246
4247         target_recovery_fini(obd);
4248         ping_evictor_stop();
4249         mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
4250
4251         if (m->mdt_opts.mo_coordinator)
4252                 mdt_hsm_cdt_stop(m);
4253
4254         mdt_hsm_cdt_fini(m);
4255
4256         mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
4257         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
4258         obd_exports_barrier(obd);
4259         obd_zombie_barrier();
4260
4261         mdt_procfs_fini(m);
4262
4263         tgt_fini(env, &m->mdt_lut);
4264         mdt_fs_cleanup(env, m);
4265         upcall_cache_cleanup(m->mdt_identity_cache);
4266         m->mdt_identity_cache = NULL;
4267
4268         if (m->mdt_namespace != NULL) {
4269                 ldlm_namespace_free(m->mdt_namespace, NULL,
4270                                     d->ld_obd->obd_force);
4271                 d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
4272         }
4273
4274         mdt_quota_fini(env, m);
4275
4276         cfs_free_nidlist(&m->mdt_squash.rsi_nosquash_nids);
4277
4278         mdt_seq_fini(env, m);
4279         mdt_fld_fini(env, m);
4280
4281         /*
4282          * Finish the stack
4283          */
4284         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4285
4286         LASSERT(atomic_read(&d->ld_ref) == 0);
4287
4288         server_put_mount(mdt_obd_name(m), true);
4289
4290         EXIT;
4291 }
4292
4293 static int mdt_postrecov(const struct lu_env *, struct mdt_device *);
4294
4295 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
4296                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
4297 {
4298         struct mdt_thread_info    *info;
4299         struct obd_device         *obd;
4300         const char                *dev = lustre_cfg_string(cfg, 0);
4301         const char                *num = lustre_cfg_string(cfg, 2);
4302         struct lustre_mount_info  *lmi = NULL;
4303         struct lustre_sb_info     *lsi;
4304         struct lu_site            *s;
4305         struct seq_server_site    *ss_site;
4306         const char                *identity_upcall = "NONE";
4307         struct md_device          *next;
4308         int                        rc;
4309         long                       node_id;
4310         mntopt_t                   mntopts;
4311         ENTRY;
4312
4313         lu_device_init(&m->mdt_lu_dev, ldt);
4314         /*
4315          * Environment (env) might be missing mdt_thread_key values at that
4316          * point, if device is allocated when mdt_thread_key is in QUIESCENT
4317          * mode.
4318          *
4319          * Usually device allocation path doesn't use module key values, but
4320          * mdt has to do a lot of work here, so allocate key value.
4321          */
4322         rc = lu_env_refill((struct lu_env *)env);
4323         if (rc != 0)
4324                 RETURN(rc);
4325
4326         info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
4327         LASSERT(info != NULL);
4328
4329         obd = class_name2obd(dev);
4330         LASSERT(obd != NULL);
4331
4332         m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
4333
4334         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
4335
4336         /* default is coordinator off, it is started through conf_param
4337          * or /proc */
4338         m->mdt_opts.mo_coordinator = 0;
4339
4340         lmi = server_get_mount(dev);
4341         if (lmi == NULL) {
4342                 CERROR("Cannot get mount info for %s!\n", dev);
4343                 RETURN(-EFAULT);
4344         } else {
4345                 lsi = s2lsi(lmi->lmi_sb);
4346                 /* CMD is supported only in IAM mode */
4347                 LASSERT(num);
4348                 node_id = simple_strtol(num, NULL, 10);
4349                 obd->u.obt.obt_magic = OBT_MAGIC;
4350         }
4351
4352         m->mdt_squash.rsi_uid = 0;
4353         m->mdt_squash.rsi_gid = 0;
4354         INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
4355         init_rwsem(&m->mdt_squash.rsi_sem);
4356         spin_lock_init(&m->mdt_osfs_lock);
4357         m->mdt_osfs_age = cfs_time_shift_64(-1000);
4358         m->mdt_enable_remote_dir = 0;
4359         m->mdt_enable_remote_dir_gid = 0;
4360
4361         m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
4362         m->mdt_lu_dev.ld_obd = obd;
4363         /* Set this lu_device to obd for error handling purposes. */
4364         obd->obd_lu_dev = &m->mdt_lu_dev;
4365
4366         /* init the stack */
4367         rc = mdt_stack_init((struct lu_env *)env, m, cfg);
4368         if (rc) {
4369                 CERROR("%s: Can't init device stack, rc %d\n",
4370                        mdt_obd_name(m), rc);
4371                 GOTO(err_lmi, rc);
4372         }
4373
4374         s = mdt_lu_site(m);
4375         ss_site = mdt_seq_site(m);
4376         s->ld_seq_site = ss_site;
4377         ss_site->ss_lu = s;
4378
4379         /* set server index */
4380         ss_site->ss_node_id = node_id;
4381
4382         /* failover is the default
4383          * FIXME: we do not failout mds0/mgs, which may cause some problems.
4384          * assumed whose ss_node_id == 0 XXX
4385          * */
4386         obd->obd_replayable = 1;
4387         /* No connection accepted until configurations will finish */
4388         obd->obd_no_conn = 1;
4389
4390         if (cfg->lcfg_bufcount > 4 && LUSTRE_CFG_BUFLEN(cfg, 4) > 0) {
4391                 char *str = lustre_cfg_string(cfg, 4);
4392                 if (strchr(str, 'n')) {
4393                         CWARN("%s: recovery disabled\n", mdt_obd_name(m));
4394                         obd->obd_replayable = 0;
4395                 }
4396         }
4397
4398         rc = mdt_fld_init(env, mdt_obd_name(m), m);
4399         if (rc)
4400                 GOTO(err_fini_stack, rc);
4401
4402         rc = mdt_seq_init(env, m);
4403         if (rc)
4404                 GOTO(err_fini_fld, rc);
4405
4406         snprintf(info->mti_u.ns_name, sizeof(info->mti_u.ns_name), "%s-%s",
4407                  LUSTRE_MDT_NAME, obd->obd_uuid.uuid);
4408         m->mdt_namespace = ldlm_namespace_new(obd, info->mti_u.ns_name,
4409                                               LDLM_NAMESPACE_SERVER,
4410                                               LDLM_NAMESPACE_GREEDY,
4411                                               LDLM_NS_TYPE_MDT);
4412         if (m->mdt_namespace == NULL)
4413                 GOTO(err_fini_seq, rc = -ENOMEM);
4414
4415         m->mdt_namespace->ns_lvbp = m;
4416         m->mdt_namespace->ns_lvbo = &mdt_lvbo;
4417
4418         ldlm_register_intent(m->mdt_namespace, mdt_intent_policy);
4419         /* set obd_namespace for compatibility with old code */
4420         obd->obd_namespace = m->mdt_namespace;
4421
4422         rc = mdt_hsm_cdt_init(m);
4423         if (rc != 0) {
4424                 CERROR("%s: error initializing coordinator, rc %d\n",
4425                        mdt_obd_name(m), rc);
4426                 GOTO(err_free_ns, rc);
4427         }
4428
4429         rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
4430                       OBD_FAIL_MDS_ALL_REQUEST_NET,
4431                       OBD_FAIL_MDS_ALL_REPLY_NET);
4432         if (rc)
4433                 GOTO(err_free_hsm, rc);
4434
4435         rc = mdt_fs_setup(env, m, obd, lsi);
4436         if (rc)
4437                 GOTO(err_tgt, rc);
4438
4439         tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
4440
4441         next = m->mdt_child;
4442         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
4443                                          &mntopts);
4444         if (rc)
4445                 GOTO(err_fs_cleanup, rc);
4446
4447         if (mntopts & MNTOPT_USERXATTR)
4448                 m->mdt_opts.mo_user_xattr = 1;
4449         else
4450                 m->mdt_opts.mo_user_xattr = 0;
4451
4452         rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
4453         if (rc)
4454                 GOTO(err_fs_cleanup, rc);
4455
4456         if (mntopts & MNTOPT_ACL)
4457                 m->mdt_opts.mo_acl = 1;
4458         else
4459                 m->mdt_opts.mo_acl = 0;
4460
4461         /* XXX: to support suppgid for ACL, we enable identity_upcall
4462          * by default, otherwise, maybe got unexpected -EACCESS. */
4463         if (m->mdt_opts.mo_acl)
4464                 identity_upcall = MDT_IDENTITY_UPCALL_PATH;
4465
4466         m->mdt_identity_cache = upcall_cache_init(mdt_obd_name(m),
4467                                                 identity_upcall,
4468                                                 &mdt_identity_upcall_cache_ops);
4469         if (IS_ERR(m->mdt_identity_cache)) {
4470                 rc = PTR_ERR(m->mdt_identity_cache);
4471                 m->mdt_identity_cache = NULL;
4472                 GOTO(err_fs_cleanup, rc);
4473         }
4474
4475         rc = mdt_procfs_init(m, dev);
4476         if (rc) {
4477                 CERROR("Can't init MDT lprocfs, rc %d\n", rc);
4478                 GOTO(err_recovery, rc);
4479         }
4480
4481         rc = mdt_quota_init(env, m, cfg);
4482         if (rc)
4483                 GOTO(err_procfs, rc);
4484
4485         m->mdt_ldlm_client = &mdt2obd_dev(m)->obd_ldlm_client;
4486         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
4487                            "mdt_ldlm_client", m->mdt_ldlm_client);
4488
4489         ping_evictor_start();
4490
4491         /* recovery will be started upon mdt_prepare()
4492          * when the whole stack is complete and ready
4493          * to serve the requests */
4494
4495         /* Reduce the initial timeout on an MDS because it doesn't need such
4496          * a long timeout as an OST does. Adaptive timeouts will adjust this
4497          * value appropriately. */
4498         if (ldlm_timeout == LDLM_TIMEOUT_DEFAULT)
4499                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
4500
4501         RETURN(0);
4502 err_procfs:
4503         mdt_procfs_fini(m);
4504 err_recovery:
4505         target_recovery_fini(obd);
4506         upcall_cache_cleanup(m->mdt_identity_cache);
4507         m->mdt_identity_cache = NULL;
4508 err_fs_cleanup:
4509         mdt_fs_cleanup(env, m);
4510 err_tgt:
4511         tgt_fini(env, &m->mdt_lut);
4512 err_free_hsm:
4513         mdt_hsm_cdt_fini(m);
4514 err_free_ns:
4515         ldlm_namespace_free(m->mdt_namespace, NULL, 0);
4516         obd->obd_namespace = m->mdt_namespace = NULL;
4517 err_fini_seq:
4518         mdt_seq_fini(env, m);
4519 err_fini_fld:
4520         mdt_fld_fini(env, m);
4521 err_fini_stack:
4522         mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
4523 err_lmi:
4524         if (lmi)
4525                 server_put_mount(dev, true);
4526         return(rc);
4527 }
4528
4529 /* For interoperability, the left element is old parameter, the right one
4530  * is the new version of the parameter, if some parameter is deprecated,
4531  * the new version should be set as NULL. */
4532 static struct cfg_interop_param mdt_interop_param[] = {
4533         { "mdt.group_upcall",   NULL },
4534         { "mdt.quota_type",     NULL },
4535         { "mdd.quota_type",     NULL },
4536         { "mdt.rootsquash",     "mdt.root_squash" },
4537         { "mdt.nosquash_nid",   "mdt.nosquash_nids" },
4538         { NULL }
4539 };
4540
4541 /* used by MGS to process specific configurations */
4542 static int mdt_process_config(const struct lu_env *env,
4543                               struct lu_device *d, struct lustre_cfg *cfg)
4544 {
4545         struct mdt_device *m = mdt_dev(d);
4546         struct md_device *md_next = m->mdt_child;
4547         struct lu_device *next = md2lu_dev(md_next);
4548         int rc;
4549         ENTRY;
4550
4551         switch (cfg->lcfg_command) {
4552         case LCFG_PARAM: {
4553                 struct obd_device          *obd = d->ld_obd;
4554
4555                 /* For interoperability */
4556                 struct cfg_interop_param   *ptr = NULL;
4557                 struct lustre_cfg          *old_cfg = NULL;
4558                 char                       *param = NULL;
4559
4560                 param = lustre_cfg_string(cfg, 1);
4561                 if (param == NULL) {
4562                         CERROR("param is empty\n");
4563                         rc = -EINVAL;
4564                         break;
4565                 }
4566
4567                 ptr = class_find_old_param(param, mdt_interop_param);
4568                 if (ptr != NULL) {
4569                         if (ptr->new_param == NULL) {
4570                                 rc = 0;
4571                                 CWARN("For interoperability, skip this %s."
4572                                       " It is obsolete.\n", ptr->old_param);
4573                                 break;
4574                         }
4575
4576                         CWARN("Found old param %s, changed it to %s.\n",
4577                               ptr->old_param, ptr->new_param);
4578
4579                         old_cfg = cfg;
4580                         cfg = lustre_cfg_rename(old_cfg, ptr->new_param);
4581                         if (IS_ERR(cfg)) {
4582                                 rc = PTR_ERR(cfg);
4583                                 break;
4584                         }
4585                 }
4586
4587                 rc = class_process_proc_param(PARAM_MDT, obd->obd_vars,
4588                                               cfg, obd);
4589                 if (rc > 0 || rc == -ENOSYS) {
4590                         /* is it an HSM var ? */
4591                         rc = class_process_proc_param(PARAM_HSM,
4592                                                       hsm_cdt_get_proc_vars(),
4593                                                       cfg, obd);
4594                         if (rc > 0 || rc == -ENOSYS)
4595                                 /* we don't understand; pass it on */
4596                                 rc = next->ld_ops->ldo_process_config(env, next,
4597                                                                       cfg);
4598                 }
4599
4600                 if (old_cfg != NULL)
4601                         lustre_cfg_free(cfg);
4602
4603                 break;
4604         }
4605         default:
4606                 /* others are passed further */
4607                 rc = next->ld_ops->ldo_process_config(env, next, cfg);
4608                 break;
4609         }
4610         RETURN(rc);
4611 }
4612
4613 static struct lu_object *mdt_object_alloc(const struct lu_env *env,
4614                                           const struct lu_object_header *hdr,
4615                                           struct lu_device *d)
4616 {
4617         struct mdt_object *mo;
4618
4619         ENTRY;
4620
4621         OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, GFP_NOFS);
4622         if (mo != NULL) {
4623                 struct lu_object *o;
4624                 struct lu_object_header *h;
4625
4626                 o = &mo->mot_obj;
4627                 h = &mo->mot_header;
4628                 lu_object_header_init(h);
4629                 lu_object_init(o, h, d);
4630                 lu_object_add_top(h, o);
4631                 o->lo_ops = &mdt_obj_ops;
4632                 spin_lock_init(&mo->mot_write_lock);
4633                 mutex_init(&mo->mot_lov_mutex);
4634                 init_rwsem(&mo->mot_open_sem);
4635                 RETURN(o);
4636         }
4637         RETURN(NULL);
4638 }
4639
4640 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
4641                            const struct lu_object_conf *unused)
4642 {
4643         struct mdt_device *d = mdt_dev(o->lo_dev);
4644         struct lu_device  *under;
4645         struct lu_object  *below;
4646         int                rc = 0;
4647         ENTRY;
4648
4649         CDEBUG(D_INFO, "object init, fid = "DFID"\n",
4650                PFID(lu_object_fid(o)));
4651
4652         under = &d->mdt_child->md_lu_dev;
4653         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
4654         if (below != NULL) {
4655                 lu_object_add(o, below);
4656         } else
4657                 rc = -ENOMEM;
4658
4659         RETURN(rc);
4660 }
4661
4662 static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
4663 {
4664         struct mdt_object *mo = mdt_obj(o);
4665         struct lu_object_header *h;
4666         ENTRY;
4667
4668         h = o->lo_header;
4669         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
4670                PFID(lu_object_fid(o)));
4671
4672         LASSERT(atomic_read(&mo->mot_open_count) == 0);
4673         LASSERT(atomic_read(&mo->mot_lease_count) == 0);
4674
4675         lu_object_fini(o);
4676         lu_object_header_fini(h);
4677         OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
4678
4679         EXIT;
4680 }
4681
4682 static int mdt_object_print(const struct lu_env *env, void *cookie,
4683                             lu_printer_t p, const struct lu_object *o)
4684 {
4685         struct mdt_object *mdto = mdt_obj((struct lu_object *)o);
4686
4687         return (*p)(env, cookie,
4688                     LUSTRE_MDT_NAME"-object@%p(flags=%d, writecount=%d)",
4689                     mdto, mdto->mot_flags, mdto->mot_write_count);
4690 }
4691
4692 static int mdt_prepare(const struct lu_env *env,
4693                 struct lu_device *pdev,
4694                 struct lu_device *cdev)
4695 {
4696         struct mdt_device *mdt = mdt_dev(cdev);
4697         struct lu_device *next = &mdt->mdt_child->md_lu_dev;
4698         struct obd_device *obd = cdev->ld_obd;
4699         int rc;
4700
4701         ENTRY;
4702
4703         LASSERT(obd);
4704
4705         rc = next->ld_ops->ldo_prepare(env, cdev, next);
4706         if (rc)
4707                 RETURN(rc);
4708
4709         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_CHANGELOG_ORIG_CTXT);
4710         if (rc)
4711                 RETURN(rc);
4712
4713         rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
4714         if (rc)
4715                 RETURN(rc);
4716
4717         rc = lfsck_register_namespace(env, mdt->mdt_bottom, mdt->mdt_namespace);
4718         /* The LFSCK instance is registered just now, so it must be there when
4719          * register the namespace to such instance. */
4720         LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
4721
4722         if (mdt->mdt_seq_site.ss_node_id == 0) {
4723                 rc = mdt->mdt_child->md_ops->mdo_root_get(env, mdt->mdt_child,
4724                                                          &mdt->mdt_md_root_fid);
4725                 if (rc)
4726                         RETURN(rc);
4727         }
4728
4729         LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
4730         target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
4731         set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
4732         LASSERT(obd->obd_no_conn);
4733         spin_lock(&obd->obd_dev_lock);
4734         obd->obd_no_conn = 0;
4735         spin_unlock(&obd->obd_dev_lock);
4736
4737         if (obd->obd_recovering == 0)
4738                 mdt_postrecov(env, mdt);
4739
4740         RETURN(rc);
4741 }
4742
4743 const struct lu_device_operations mdt_lu_ops = {
4744         .ldo_object_alloc   = mdt_object_alloc,
4745         .ldo_process_config = mdt_process_config,
4746         .ldo_prepare        = mdt_prepare,
4747 };
4748
4749 static const struct lu_object_operations mdt_obj_ops = {
4750         .loo_object_init    = mdt_object_init,
4751         .loo_object_free    = mdt_object_free,
4752         .loo_object_print   = mdt_object_print
4753 };
4754
4755 static int mdt_obd_set_info_async(const struct lu_env *env,
4756                                   struct obd_export *exp,
4757                                   __u32 keylen, void *key,
4758                                   __u32 vallen, void *val,
4759                                   struct ptlrpc_request_set *set)
4760 {
4761         int rc;
4762
4763         ENTRY;
4764
4765         if (KEY_IS(KEY_SPTLRPC_CONF)) {
4766                 rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
4767                 RETURN(rc);
4768         }
4769
4770         RETURN(0);
4771 }
4772
4773 /**
4774  * Match client and server connection feature flags.
4775  *
4776  * Compute the compatibility flags for a connection request based on
4777  * features mutually supported by client and server.
4778  *
4779  * The obd_export::exp_connect_data.ocd_connect_flags field in \a exp
4780  * must not be updated here, otherwise a partially initialized value may
4781  * be exposed. After the connection request is successfully processed,
4782  * the top-level MDT connect request handler atomically updates the export
4783  * connect flags from the obd_connect_data::ocd_connect_flags field of the
4784  * reply. \see mdt_connect().
4785  *
4786  * \param exp   the obd_export associated with this client/target pair
4787  * \param mdt   the target device for the connection
4788  * \param data  stores data for this connect request
4789  *
4790  * \retval 0       success
4791  * \retval -EPROTO \a data unexpectedly has zero obd_connect_data::ocd_brw_size
4792  * \retval -EBADE  client and server feature requirements are incompatible
4793  */
4794 static int mdt_connect_internal(struct obd_export *exp,
4795                                 struct mdt_device *mdt,
4796                                 struct obd_connect_data *data)
4797 {
4798         LASSERT(data != NULL);
4799
4800         data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
4801         data->ocd_ibits_known &= MDS_INODELOCK_FULL;
4802
4803         if (!(data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
4804             !(data->ocd_connect_flags & OBD_CONNECT_IBITS)) {
4805                 CWARN("%s: client %s does not support ibits lock, either "
4806                       "very old or an invalid client: flags "LPX64"\n",
4807                       mdt_obd_name(mdt), exp->exp_client_uuid.uuid,
4808                       data->ocd_connect_flags);
4809                 return -EBADE;
4810         }
4811
4812         if (!mdt->mdt_opts.mo_acl)
4813                 data->ocd_connect_flags &= ~OBD_CONNECT_ACL;
4814
4815         if (!mdt->mdt_opts.mo_user_xattr)
4816                 data->ocd_connect_flags &= ~OBD_CONNECT_XATTR;
4817
4818         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
4819                 data->ocd_brw_size = min(data->ocd_brw_size,
4820                                          (__u32)MD_MAX_BRW_SIZE);
4821                 if (data->ocd_brw_size == 0) {
4822                         CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
4823                                " ocd_version: %x ocd_grant: %d "
4824                                "ocd_index: %u ocd_brw_size is "
4825                                "unexpectedly zero, network data "
4826                                "corruption? Refusing connection of this"
4827                                " client\n",
4828                                mdt_obd_name(mdt),
4829                                exp->exp_client_uuid.uuid,
4830                                exp, data->ocd_connect_flags, data->ocd_version,
4831                                data->ocd_grant, data->ocd_index);
4832                         return -EPROTO;
4833                 }
4834         }
4835
4836         /* NB: Disregard the rule against updating
4837          * exp_connect_data.ocd_connect_flags in this case, since
4838          * tgt_client_new() needs to know if this is a lightweight
4839          * connection, and it is safe to expose this flag before
4840          * connection processing completes. */
4841         if (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) {
4842                 spin_lock(&exp->exp_lock);
4843                 *exp_connect_flags_ptr(exp) |= OBD_CONNECT_LIGHTWEIGHT;
4844                 spin_unlock(&exp->exp_lock);
4845         }
4846
4847         data->ocd_version = LUSTRE_VERSION_CODE;
4848
4849         if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
4850                 CWARN("%s: MDS requires FID support, but client not\n",
4851                       mdt_obd_name(mdt));
4852                 return -EBADE;
4853         }
4854
4855         if (OCD_HAS_FLAG(data, PINGLESS)) {
4856                 if (ptlrpc_pinger_suppress_pings()) {
4857                         spin_lock(&exp->exp_obd->obd_dev_lock);
4858                         list_del_init(&exp->exp_obd_chain_timed);
4859                         spin_unlock(&exp->exp_obd->obd_dev_lock);
4860                 } else {
4861                         data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
4862                 }
4863         }
4864
4865         data->ocd_max_easize = mdt->mdt_max_ea_size;
4866
4867         return 0;
4868 }
4869
4870 static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
4871                                    struct mdt_thread_info *info,
4872                                    struct mdt_file_data *mfd)
4873 {
4874         struct lu_context ses;
4875         int rc;
4876         ENTRY;
4877
4878         rc = lu_context_init(&ses, LCT_SERVER_SESSION);
4879         if (rc)
4880                 RETURN(rc);
4881
4882         env->le_ses = &ses;
4883         lu_context_enter(&ses);
4884
4885         mdt_ucred(info)->uc_valid = UCRED_OLD;
4886         rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
4887
4888         lu_context_exit(&ses);
4889         lu_context_fini(&ses);
4890         env->le_ses = NULL;
4891
4892         RETURN(rc);
4893 }
4894
4895 static int mdt_export_cleanup(struct obd_export *exp)
4896 {
4897         struct list_head         closing_list;
4898         struct mdt_export_data  *med = &exp->exp_mdt_data;
4899         struct obd_device       *obd = exp->exp_obd;
4900         struct mdt_device       *mdt;
4901         struct mdt_thread_info  *info;
4902         struct lu_env            env;
4903         struct mdt_file_data    *mfd, *n;
4904         int rc = 0;
4905         ENTRY;
4906
4907         INIT_LIST_HEAD(&closing_list);
4908         spin_lock(&med->med_open_lock);
4909         while (!list_empty(&med->med_open_head)) {
4910                 struct list_head *tmp = med->med_open_head.next;
4911                 mfd = list_entry(tmp, struct mdt_file_data, mfd_list);
4912
4913                 /* Remove mfd handle so it can't be found again.
4914                  * We are consuming the mfd_list reference here. */
4915                 class_handle_unhash(&mfd->mfd_handle);
4916                 list_move_tail(&mfd->mfd_list, &closing_list);
4917         }
4918         spin_unlock(&med->med_open_lock);
4919         mdt = mdt_dev(obd->obd_lu_dev);
4920         LASSERT(mdt != NULL);
4921
4922         rc = lu_env_init(&env, LCT_MD_THREAD);
4923         if (rc)
4924                 RETURN(rc);
4925
4926         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
4927         LASSERT(info != NULL);
4928         memset(info, 0, sizeof *info);
4929         info->mti_env = &env;
4930         info->mti_mdt = mdt;
4931         info->mti_exp = exp;
4932
4933         if (!list_empty(&closing_list)) {
4934                 struct md_attr *ma = &info->mti_attr;
4935
4936                 /* Close any open files (which may also cause orphan
4937                  * unlinking). */
4938                 list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
4939                         list_del_init(&mfd->mfd_list);
4940                         ma->ma_need = ma->ma_valid = 0;
4941
4942                         /* This file is being closed due to an eviction, it
4943                          * could have been modified and now dirty regarding to
4944                          * HSM archive, check this!
4945                          * The logic here is to mark a file dirty if there's a
4946                          * chance it was dirtied before the client was evicted,
4947                          * so that we don't have to wait for a release attempt
4948                          * before finding out the file was actually dirty and
4949                          * fail the release. Aggressively marking it dirty here
4950                          * will cause the policy engine to attempt to
4951                          * re-archive it; when rearchiving, we can compare the
4952                          * current version to the HSM data_version and make the
4953                          * archive request into a noop if it's not actually
4954                          * dirty.
4955                          */
4956                         if (mfd->mfd_mode & FMODE_WRITE)
4957                                 rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
4958
4959                         /* Don't unlink orphan on failover umount, LU-184 */
4960                         if (exp->exp_flags & OBD_OPT_FAILOVER) {
4961                                 ma->ma_valid = MA_FLAGS;
4962                                 ma->ma_attr_flags |= MDS_KEEP_ORPHAN;
4963                         }
4964                         mdt_mfd_close(info, mfd);
4965                 }
4966         }
4967         info->mti_mdt = NULL;
4968         /* cleanup client slot early */
4969         /* Do not erase record for recoverable client. */
4970         if (!(exp->exp_flags & OBD_OPT_FAILOVER) || exp->exp_failed)
4971                 tgt_client_del(&env, exp);
4972         lu_env_fini(&env);
4973
4974         RETURN(rc);
4975 }
4976
4977 static int mdt_obd_disconnect(struct obd_export *exp)
4978 {
4979         int rc;
4980         ENTRY;
4981
4982         LASSERT(exp);
4983         class_export_get(exp);
4984
4985         nodemap_del_member(exp);
4986         rc = server_disconnect_export(exp);
4987         if (rc != 0)
4988                 CDEBUG(D_IOCTL, "server disconnect error: rc = %d\n", rc);
4989
4990         rc = mdt_export_cleanup(exp);
4991         class_export_put(exp);
4992         RETURN(rc);
4993 }
4994
4995 /* mds_connect copy */
4996 static int mdt_obd_connect(const struct lu_env *env,
4997                            struct obd_export **exp, struct obd_device *obd,
4998                            struct obd_uuid *cluuid,
4999                            struct obd_connect_data *data,
5000                            void *localdata)
5001 {
5002         struct obd_export       *lexp;
5003         struct lustre_handle    conn = { 0 };
5004         struct mdt_device       *mdt;
5005         int                      rc;
5006         lnet_nid_t              *client_nid = localdata;
5007         ENTRY;
5008
5009         LASSERT(env != NULL);
5010         if (!exp || !obd || !cluuid)
5011                 RETURN(-EINVAL);
5012
5013         mdt = mdt_dev(obd->obd_lu_dev);
5014
5015         /*
5016          * first, check whether the stack is ready to handle requests
5017          * XXX: probably not very appropriate method is used now
5018          *      at some point we should find a better one
5019          */
5020         if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
5021             !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
5022                 rc = obd_get_info(env, mdt->mdt_child_exp,
5023                                   sizeof(KEY_OSP_CONNECTED),
5024                                   KEY_OSP_CONNECTED, NULL, NULL);
5025                 if (rc)
5026                         RETURN(-EAGAIN);
5027                 set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
5028         }
5029
5030         rc = class_connect(&conn, obd, cluuid);
5031         if (rc)
5032                 RETURN(rc);
5033
5034         lexp = class_conn2export(&conn);
5035         LASSERT(lexp != NULL);
5036
5037         rc = mdt_connect_internal(lexp, mdt, data);
5038         if (rc == 0) {
5039                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
5040
5041                 LASSERT(lcd);
5042                 memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
5043                 rc = tgt_client_new(env, lexp);
5044                 if (rc == 0) {
5045                         rc = nodemap_add_member(*client_nid, lexp);
5046                         if (rc != 0 && rc != -EEXIST)
5047                                 goto out;
5048
5049                         mdt_export_stats_init(obd, lexp, localdata);
5050                 }
5051
5052                 /* For phase I, sync for cross-ref operation. */
5053                 spin_lock(&lexp->exp_lock);
5054                 lexp->exp_keep_sync = 1;
5055                 spin_unlock(&lexp->exp_lock);
5056         }
5057 out:
5058         if (rc != 0) {
5059                 class_disconnect(lexp);
5060                 *exp = NULL;
5061         } else {
5062                 *exp = lexp;
5063         }
5064
5065         RETURN(rc);
5066 }
5067
5068 static int mdt_obd_reconnect(const struct lu_env *env,
5069                              struct obd_export *exp, struct obd_device *obd,
5070                              struct obd_uuid *cluuid,
5071                              struct obd_connect_data *data,
5072                              void *localdata)
5073 {
5074         lnet_nid_t             *client_nid = localdata;
5075         int                     rc;
5076         ENTRY;
5077
5078         if (exp == NULL || obd == NULL || cluuid == NULL)
5079                 RETURN(-EINVAL);
5080
5081         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
5082         if (rc == 0) {
5083                 rc = nodemap_add_member(*client_nid, exp);
5084                 if (rc == 0 || rc == -EEXIST)
5085                         mdt_export_stats_init(obd, exp, localdata);
5086         }
5087
5088         RETURN(rc);
5089 }
5090
5091 /* FIXME: Can we avoid using these two interfaces? */
5092 static int mdt_init_export(struct obd_export *exp)
5093 {
5094         struct mdt_export_data *med = &exp->exp_mdt_data;
5095         int                     rc;
5096         ENTRY;
5097
5098         INIT_LIST_HEAD(&med->med_open_head);
5099         spin_lock_init(&med->med_open_lock);
5100         mutex_init(&med->med_idmap_mutex);
5101         med->med_idmap = NULL;
5102         spin_lock(&exp->exp_lock);
5103         exp->exp_connecting = 1;
5104         spin_unlock(&exp->exp_lock);
5105
5106         /* self-export doesn't need client data and ldlm initialization */
5107         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5108                                      &exp->exp_client_uuid)))
5109                 RETURN(0);
5110
5111         rc = tgt_client_alloc(exp);
5112         if (rc)
5113                 GOTO(err, rc);
5114
5115         rc = ldlm_init_export(exp);
5116         if (rc)
5117                 GOTO(err_free, rc);
5118
5119         RETURN(rc);
5120
5121 err_free:
5122         tgt_client_free(exp);
5123 err:
5124         CERROR("%s: Failed to initialize export: rc = %d\n",
5125                exp->exp_obd->obd_name, rc);
5126         return rc;
5127 }
5128
5129 static int mdt_destroy_export(struct obd_export *exp)
5130 {
5131         ENTRY;
5132
5133         if (exp_connect_rmtclient(exp))
5134                 mdt_cleanup_idmap(&exp->exp_mdt_data);
5135
5136         target_destroy_export(exp);
5137         /* destroy can be called from failed obd_setup, so
5138          * checking uuid is safer than obd_self_export */
5139         if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
5140                                      &exp->exp_client_uuid)))
5141                 RETURN(0);
5142
5143         ldlm_destroy_export(exp);
5144         tgt_client_free(exp);
5145
5146         LASSERT(list_empty(&exp->exp_outstanding_replies));
5147         LASSERT(list_empty(&exp->exp_mdt_data.med_open_head));
5148
5149         RETURN(0);
5150 }
5151
5152 int mdt_links_read(struct mdt_thread_info *info, struct mdt_object *mdt_obj,
5153                    struct linkea_data *ldata)
5154 {
5155         int rc;
5156
5157         LASSERT(ldata->ld_buf->lb_buf != NULL);
5158
5159         if (!mdt_object_exists(mdt_obj))
5160                 return -ENODATA;
5161
5162         rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5163                           ldata->ld_buf, XATTR_NAME_LINK);
5164         if (rc == -ERANGE) {
5165                 /* Buf was too small, figure out what we need. */
5166                 lu_buf_free(ldata->ld_buf);
5167                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5168                                   ldata->ld_buf, XATTR_NAME_LINK);
5169                 if (rc < 0)
5170                         return rc;
5171                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
5172                 if (ldata->ld_buf->lb_buf == NULL)
5173                         return -ENOMEM;
5174                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5175                                   ldata->ld_buf, XATTR_NAME_LINK);
5176         }
5177         if (rc < 0)
5178                 return rc;
5179
5180         return linkea_init(ldata);
5181 }
5182
5183 /**
5184  * Given an MDT object, try to look up the full path to the object.
5185  * Part of the MDT layer implementation of lfs fid2path.
5186  *
5187  * \param[in]     info  Per-thread common data shared by MDT level handlers.
5188  * \param[in]     obj   Object to do path lookup of
5189  * \param[in,out] fp    User-provided struct to store path information
5190  *
5191  * \retval 0 Lookup successful, path information stored in fp
5192  * \retval -EAGAIN Lookup failed, usually because object is being moved
5193  * \retval negative errno if there was a problem
5194  */
5195 static int mdt_path_current(struct mdt_thread_info *info,
5196                             struct mdt_object *obj,
5197                             struct getinfo_fid2path *fp)
5198 {
5199         struct mdt_device       *mdt = info->mti_mdt;
5200         struct mdt_object       *mdt_obj;
5201         struct link_ea_header   *leh;
5202         struct link_ea_entry    *lee;
5203         struct lu_name          *tmpname = &info->mti_name;
5204         struct lu_fid           *tmpfid = &info->mti_tmp_fid1;
5205         struct lu_buf           *buf = &info->mti_big_buf;
5206         char                    *ptr;
5207         int                     reclen;
5208         struct linkea_data      ldata = { NULL };
5209         int                     rc = 0;
5210         bool                    first = true;
5211         ENTRY;
5212
5213         /* temp buffer for path element, the buffer will be finally freed
5214          * in mdt_thread_info_fini */
5215         buf = lu_buf_check_and_alloc(buf, PATH_MAX);
5216         if (buf->lb_buf == NULL)
5217                 RETURN(-ENOMEM);
5218
5219         ldata.ld_buf = buf;
5220         ptr = fp->gf_path + fp->gf_pathlen - 1;
5221         *ptr = 0;
5222         --ptr;
5223         *tmpfid = fp->gf_fid = *mdt_object_fid(obj);
5224
5225         /* root FID only exists on MDT0, and fid2path should also ends at MDT0,
5226          * so checking root_fid can only happen on MDT0. */
5227         while (!lu_fid_eq(&mdt->mdt_md_root_fid, &fp->gf_fid)) {
5228                 struct lu_buf           lmv_buf;
5229
5230                 mdt_obj = mdt_object_find(info->mti_env, mdt, tmpfid);
5231                 if (IS_ERR(mdt_obj))
5232                         GOTO(out, rc = PTR_ERR(mdt_obj));
5233
5234                 if (!mdt_object_exists(mdt_obj)) {
5235                         mdt_object_put(info->mti_env, mdt_obj);
5236                         GOTO(out, rc = -ENOENT);
5237                 }
5238
5239                 if (mdt_object_remote(mdt_obj)) {
5240                         mdt_object_put(info->mti_env, mdt_obj);
5241                         GOTO(remote_out, rc = -EREMOTE);
5242                 }
5243
5244                 rc = mdt_links_read(info, mdt_obj, &ldata);
5245                 if (rc != 0) {
5246                         mdt_object_put(info->mti_env, mdt_obj);
5247                         GOTO(out, rc);
5248                 }
5249
5250                 leh = buf->lb_buf;
5251                 lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
5252                 linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
5253                 /* If set, use link #linkno for path lookup, otherwise use
5254                    link #0.  Only do this for the final path element. */
5255                 if (first && fp->gf_linkno < leh->leh_reccount) {
5256                         int count;
5257                         for (count = 0; count < fp->gf_linkno; count++) {
5258                                 lee = (struct link_ea_entry *)
5259                                      ((char *)lee + reclen);
5260                                 linkea_entry_unpack(lee, &reclen, tmpname,
5261                                                     tmpfid);
5262                         }
5263                         if (fp->gf_linkno < leh->leh_reccount - 1)
5264                                 /* indicate to user there are more links */
5265                                 fp->gf_linkno++;
5266                 }
5267
5268                 lmv_buf.lb_buf = info->mti_xattr_buf;
5269                 lmv_buf.lb_len = sizeof(info->mti_xattr_buf);
5270                 /* Check if it is slave stripes */
5271                 rc = mo_xattr_get(info->mti_env, mdt_object_child(mdt_obj),
5272                                   &lmv_buf, XATTR_NAME_LMV);
5273                 mdt_object_put(info->mti_env, mdt_obj);
5274                 if (rc > 0) {
5275                         union lmv_mds_md *lmm = lmv_buf.lb_buf;
5276
5277                         /* For slave stripes, get its master */
5278                         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE) {
5279                                 fp->gf_fid = *tmpfid;
5280                                 continue;
5281                         }
5282                 } else if (rc < 0 && rc != -ENODATA) {
5283                         GOTO(out, rc);
5284                 }
5285
5286                 rc = 0;
5287
5288                 /* Pack the name in the end of the buffer */
5289                 ptr -= tmpname->ln_namelen;
5290                 if (ptr - 1 <= fp->gf_path)
5291                         GOTO(out, rc = -EOVERFLOW);
5292                 strncpy(ptr, tmpname->ln_name, tmpname->ln_namelen);
5293                 *(--ptr) = '/';
5294
5295                 /* keep the last resolved fid to the client, so the
5296                  * client will build the left path on another MDT for
5297                  * remote object */
5298                 fp->gf_fid = *tmpfid;
5299
5300                 first = false;
5301         }
5302
5303 remote_out:
5304         ptr++; /* skip leading / */
5305         memmove(fp->gf_path, ptr, fp->gf_path + fp->gf_pathlen - ptr);
5306
5307 out:
5308         RETURN(rc);
5309 }
5310
5311 /**
5312  * Given an MDT object, use mdt_path_current to get the path.
5313  * Essentially a wrapper to retry mdt_path_current a set number of times
5314  * if -EAGAIN is returned (usually because an object is being moved).
5315  *
5316  * Part of the MDT layer implementation of lfs fid2path.
5317  *
5318  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5319  * \param[in]     obj   Object to do path lookup of
5320  * \param[in,out] fp    User-provided struct for arguments and to store path
5321  *                      information
5322  *
5323  * \retval 0 Lookup successful, path information stored in fp
5324  * \retval negative errno if there was a problem
5325  */
5326 static int mdt_path(struct mdt_thread_info *info, struct mdt_object *obj,
5327                     struct getinfo_fid2path *fp)
5328 {
5329         struct mdt_device       *mdt = info->mti_mdt;
5330         int                     tries = 3;
5331         int                     rc = -EAGAIN;
5332         ENTRY;
5333
5334         if (fp->gf_pathlen < 3)
5335                 RETURN(-EOVERFLOW);
5336
5337         if (lu_fid_eq(&mdt->mdt_md_root_fid, mdt_object_fid(obj))) {
5338                 fp->gf_path[0] = '\0';
5339                 RETURN(0);
5340         }
5341
5342         /* Retry multiple times in case file is being moved */
5343         while (tries-- && rc == -EAGAIN)
5344                 rc = mdt_path_current(info, obj, fp);
5345
5346         RETURN(rc);
5347 }
5348
5349 /**
5350  * Get the full path of the provided FID, as of changelog record recno.
5351  *
5352  * This checks sanity and looks up object for user provided FID
5353  * before calling the actual path lookup code.
5354  *
5355  * Part of the MDT layer implementation of lfs fid2path.
5356  *
5357  * \param[in]     info  Per-thread common data shared by mdt level handlers.
5358  * \param[in,out] fp    User-provided struct for arguments and to store path
5359  *                      information
5360  *
5361  * \retval 0 Lookup successful, path information and recno stored in fp
5362  * \retval -ENOENT, object does not exist
5363  * \retval negative errno if there was a problem
5364  */
5365 static int mdt_fid2path(struct mdt_thread_info *info,
5366                         struct getinfo_fid2path *fp)
5367 {
5368         struct mdt_device *mdt = info->mti_mdt;
5369         struct mdt_object *obj;
5370         int    rc;
5371         ENTRY;
5372
5373         CDEBUG(D_IOCTL, "path get "DFID" from "LPU64" #%d\n",
5374                 PFID(&fp->gf_fid), fp->gf_recno, fp->gf_linkno);
5375
5376         if (!fid_is_sane(&fp->gf_fid))
5377                 RETURN(-EINVAL);
5378
5379         if (!fid_is_namespace_visible(&fp->gf_fid)) {
5380                 CWARN("%s: "DFID" is invalid, sequence should be "
5381                       ">= "LPX64"\n", mdt_obd_name(mdt),
5382                       PFID(&fp->gf_fid), (__u64)FID_SEQ_NORMAL);
5383                 RETURN(-EINVAL);
5384         }
5385
5386         obj = mdt_object_find(info->mti_env, mdt, &fp->gf_fid);
5387         if (IS_ERR(obj)) {
5388                 rc = PTR_ERR(obj);
5389                 CDEBUG(D_IOCTL, "cannot find "DFID": rc = %d\n",
5390                        PFID(&fp->gf_fid), rc);
5391                 RETURN(rc);
5392         }
5393
5394         if (mdt_object_remote(obj))
5395                 rc = -EREMOTE;
5396         else if (!mdt_object_exists(obj))
5397                 rc = -ENOENT;
5398         else
5399                 rc = 0;
5400
5401         if (rc < 0) {
5402                 mdt_object_put(info->mti_env, obj);
5403                 CDEBUG(D_IOCTL, "nonlocal object "DFID": rc = %d\n",
5404                        PFID(&fp->gf_fid), rc);
5405                 RETURN(rc);
5406         }
5407
5408         rc = mdt_path(info, obj, fp);
5409
5410         CDEBUG(D_INFO, "fid "DFID", path %s recno "LPX64" linkno %u\n",
5411                PFID(&fp->gf_fid), fp->gf_path, fp->gf_recno, fp->gf_linkno);
5412
5413         mdt_object_put(info->mti_env, obj);
5414
5415         RETURN(rc);
5416 }
5417
5418 static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
5419                             void *val, int vallen)
5420 {
5421         struct getinfo_fid2path *fpout, *fpin;
5422         int rc = 0;
5423
5424         fpin = key + cfs_size_round(sizeof(KEY_FID2PATH));
5425         fpout = val;
5426
5427         if (ptlrpc_req_need_swab(info->mti_pill->rc_req))
5428                 lustre_swab_fid2path(fpin);
5429
5430         memcpy(fpout, fpin, sizeof(*fpin));
5431         if (fpout->gf_pathlen != vallen - sizeof(*fpin))
5432                 RETURN(-EINVAL);
5433
5434         rc = mdt_fid2path(info, fpout);
5435         RETURN(rc);
5436 }
5437
5438 int mdt_get_info(struct tgt_session_info *tsi)
5439 {
5440         char    *key;
5441         int      keylen;
5442         __u32   *vallen;
5443         void    *valout;
5444         int      rc;
5445
5446         ENTRY;
5447
5448         key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
5449         if (key == NULL) {
5450                 CDEBUG(D_IOCTL, "No GETINFO key\n");
5451                 RETURN(err_serious(-EFAULT));
5452         }
5453         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
5454                                       RCL_CLIENT);
5455
5456         vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
5457         if (vallen == NULL) {
5458                 CDEBUG(D_IOCTL, "%s: cannot get RMF_GETINFO_VALLEN buffer\n",
5459                                 tgt_name(tsi->tsi_tgt));
5460                 RETURN(err_serious(-EFAULT));
5461         }
5462
5463         req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
5464                              *vallen);
5465         rc = req_capsule_server_pack(tsi->tsi_pill);
5466         if (rc)
5467                 RETURN(err_serious(rc));
5468
5469         valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
5470         if (valout == NULL) {
5471                 CDEBUG(D_IOCTL, "%s: cannot get get-info RPC out buffer\n",
5472                                 tgt_name(tsi->tsi_tgt));
5473                 RETURN(err_serious(-EFAULT));
5474         }
5475
5476         if (KEY_IS(KEY_FID2PATH)) {
5477                 struct mdt_thread_info  *info = tsi2mdt_info(tsi);
5478
5479                 rc = mdt_rpc_fid2path(info, key, valout, *vallen);
5480                 mdt_thread_info_fini(info);
5481         } else {
5482                 rc = -EINVAL;
5483         }
5484         RETURN(rc);
5485 }
5486
5487 /* Pass the ioc down */
5488 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
5489                          unsigned int cmd, int len, void *data)
5490 {
5491         struct lu_context ioctl_session;
5492         struct md_device *next = mdt->mdt_child;
5493         int rc;
5494         ENTRY;
5495
5496         rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
5497         if (rc)
5498                 RETURN(rc);
5499         ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
5500         lu_context_enter(&ioctl_session);
5501         env->le_ses = &ioctl_session;
5502
5503         LASSERT(next->md_ops->mdo_iocontrol);
5504         rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
5505
5506         lu_context_exit(&ioctl_session);
5507         lu_context_fini(&ioctl_session);
5508         RETURN(rc);
5509 }
5510
5511 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
5512 {
5513         struct obd_ioctl_data *data = karg;
5514         struct lu_fid *fid;
5515         __u64 version;
5516         struct mdt_object *obj;
5517         struct mdt_lock_handle  *lh;
5518         int rc;
5519         ENTRY;
5520
5521         if (data->ioc_inlbuf1 == NULL || data->ioc_inllen1 != sizeof(*fid) ||
5522             data->ioc_inlbuf2 == NULL || data->ioc_inllen2 != sizeof(version))
5523                 RETURN(-EINVAL);
5524
5525         fid = (struct lu_fid *)data->ioc_inlbuf1;
5526
5527         if (!fid_is_sane(fid))
5528                 RETURN(-EINVAL);
5529
5530         CDEBUG(D_IOCTL, "getting version for "DFID"\n", PFID(fid));
5531
5532         lh = &mti->mti_lh[MDT_LH_PARENT];
5533         mdt_lock_reg_init(lh, LCK_CR);
5534
5535         obj = mdt_object_find_lock(mti, fid, lh, MDS_INODELOCK_UPDATE);
5536         if (IS_ERR(obj))
5537                 RETURN(PTR_ERR(obj));
5538
5539         if (mdt_object_remote(obj)) {
5540                 rc = -EREMOTE;
5541                 /**
5542                  * before calling version get the correct MDS should be
5543                  * fid, this is error to find remote object here
5544                  */
5545                 CERROR("nonlocal object "DFID"\n", PFID(fid));
5546         } else if (!mdt_object_exists(obj)) {
5547                 *(__u64 *)data->ioc_inlbuf2 = ENOENT_VERSION;
5548                 rc = -ENOENT;
5549         } else {
5550                 version = dt_version_get(mti->mti_env, mdt_obj2dt(obj));
5551                *(__u64 *)data->ioc_inlbuf2 = version;
5552                 rc = 0;
5553         }
5554         mdt_object_unlock_put(mti, obj, lh, 1);
5555         RETURN(rc);
5556 }
5557
5558 /* ioctls on obd dev */
5559 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
5560                          void *karg, void *uarg)
5561 {
5562         struct lu_env      env;
5563         struct obd_device *obd = exp->exp_obd;
5564         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
5565         struct dt_device  *dt = mdt->mdt_bottom;
5566         int rc;
5567
5568         ENTRY;
5569         CDEBUG(D_IOCTL, "handling ioctl cmd %#x\n", cmd);
5570         rc = lu_env_init(&env, LCT_MD_THREAD);
5571         if (rc)
5572                 RETURN(rc);
5573
5574         switch (cmd) {
5575         case OBD_IOC_SYNC:
5576                 rc = mdt_device_sync(&env, mdt);
5577                 break;
5578         case OBD_IOC_SET_READONLY:
5579                 rc = dt->dd_ops->dt_ro(&env, dt);
5580                 break;
5581         case OBD_IOC_ABORT_RECOVERY:
5582                 CERROR("%s: Aborting recovery for device\n", mdt_obd_name(mdt));
5583                 target_stop_recovery_thread(obd);
5584                 rc = 0;
5585                 break;
5586         case OBD_IOC_CHANGELOG_REG:
5587         case OBD_IOC_CHANGELOG_DEREG:
5588         case OBD_IOC_CHANGELOG_CLEAR:
5589                 rc = mdt_ioc_child(&env, mdt, cmd, len, karg);
5590                 break;
5591         case OBD_IOC_START_LFSCK: {
5592                 struct md_device *next = mdt->mdt_child;
5593                 struct obd_ioctl_data *data = karg;
5594                 struct lfsck_start_param lsp;
5595
5596                 if (unlikely(data == NULL)) {
5597                         rc = -EINVAL;
5598                         break;
5599                 }
5600
5601                 lsp.lsp_start = (struct lfsck_start *)(data->ioc_inlbuf1);
5602                 lsp.lsp_index_valid = 0;
5603                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &lsp);
5604                 break;
5605         }
5606         case OBD_IOC_STOP_LFSCK: {
5607                 struct md_device        *next = mdt->mdt_child;
5608                 struct obd_ioctl_data   *data = karg;
5609                 struct lfsck_stop        stop;
5610
5611                 stop.ls_status = LS_STOPPED;
5612                 /* Old lfsck utils may pass NULL @stop. */
5613                 if (data->ioc_inlbuf1 == NULL)
5614                         stop.ls_flags = 0;
5615                 else
5616                         stop.ls_flags =
5617                         ((struct lfsck_stop *)(data->ioc_inlbuf1))->ls_flags;
5618
5619                 rc = next->md_ops->mdo_iocontrol(&env, next, cmd, 0, &stop);
5620                 break;
5621         }
5622         case OBD_IOC_GET_OBJ_VERSION: {
5623                 struct mdt_thread_info *mti;
5624                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5625                 memset(mti, 0, sizeof *mti);
5626                 mti->mti_env = &env;
5627                 mti->mti_mdt = mdt;
5628                 mti->mti_exp = exp;
5629
5630                 rc = mdt_ioc_version_get(mti, karg);
5631                 break;
5632         }
5633         case OBD_IOC_CATLOGLIST: {
5634                 struct mdt_thread_info *mti;
5635
5636                 mti = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
5637                 lu_local_obj_fid(&mti->mti_tmp_fid1, LLOG_CATALOGS_OID);
5638                 rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg,
5639                                        &mti->mti_tmp_fid1);
5640                 break;
5641          }
5642         default:
5643                 rc = -EOPNOTSUPP;
5644                 CERROR("%s: Not supported cmd = %d, rc = %d\n",
5645                         mdt_obd_name(mdt), cmd, rc);
5646         }
5647
5648         lu_env_fini(&env);
5649         RETURN(rc);
5650 }
5651
5652 static int mdt_postrecov(const struct lu_env *env, struct mdt_device *mdt)
5653 {
5654         struct lu_device *ld = md2lu_dev(mdt->mdt_child);
5655         struct lfsck_start_param lsp;
5656         int rc;
5657         ENTRY;
5658
5659         lsp.lsp_start = NULL;
5660         lsp.lsp_index_valid = 0;
5661         rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
5662                                                    OBD_IOC_START_LFSCK,
5663                                                    0, &lsp);
5664         if (rc != 0 && rc != -EALREADY)
5665                 CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
5666                       mdt_obd_name(mdt), rc);
5667
5668         rc = ld->ld_ops->ldo_recovery_complete(env, ld);
5669         RETURN(rc);
5670 }
5671
5672 static int mdt_obd_postrecov(struct obd_device *obd)
5673 {
5674         struct lu_env env;
5675         int rc;
5676
5677         rc = lu_env_init(&env, LCT_MD_THREAD);
5678         if (rc)
5679                 RETURN(rc);
5680         rc = mdt_postrecov(&env, mdt_dev(obd->obd_lu_dev));
5681         lu_env_fini(&env);
5682         return rc;
5683 }
5684
5685 static struct obd_ops mdt_obd_device_ops = {
5686         .o_owner          = THIS_MODULE,
5687         .o_set_info_async = mdt_obd_set_info_async,
5688         .o_connect        = mdt_obd_connect,
5689         .o_reconnect      = mdt_obd_reconnect,
5690         .o_disconnect     = mdt_obd_disconnect,
5691         .o_init_export    = mdt_init_export,
5692         .o_destroy_export = mdt_destroy_export,
5693         .o_iocontrol      = mdt_iocontrol,
5694         .o_postrecov      = mdt_obd_postrecov,
5695 };
5696
5697 static struct lu_device* mdt_device_fini(const struct lu_env *env,
5698                                          struct lu_device *d)
5699 {
5700         struct mdt_device *m = mdt_dev(d);
5701         ENTRY;
5702
5703         mdt_fini(env, m);
5704         RETURN(NULL);
5705 }
5706
5707 static struct lu_device *mdt_device_free(const struct lu_env *env,
5708                                          struct lu_device *d)
5709 {
5710         struct mdt_device *m = mdt_dev(d);
5711         ENTRY;
5712
5713         lu_device_fini(&m->mdt_lu_dev);
5714         OBD_FREE_PTR(m);
5715
5716         RETURN(NULL);
5717 }
5718
5719 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
5720                                           struct lu_device_type *t,
5721                                           struct lustre_cfg *cfg)
5722 {
5723         struct lu_device  *l;
5724         struct mdt_device *m;
5725
5726         OBD_ALLOC_PTR(m);
5727         if (m != NULL) {
5728                 int rc;
5729
5730                 l = &m->mdt_lu_dev;
5731                 rc = mdt_init0(env, m, t, cfg);
5732                 if (rc != 0) {
5733                         mdt_device_free(env, l);
5734                         l = ERR_PTR(rc);
5735                         return l;
5736                 }
5737         } else
5738                 l = ERR_PTR(-ENOMEM);
5739         return l;
5740 }
5741
5742 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
5743 LU_KEY_INIT(mdt, struct mdt_thread_info);
5744
5745 static void mdt_key_fini(const struct lu_context *ctx,
5746                          struct lu_context_key *key, void* data)
5747 {
5748         struct mdt_thread_info *info = data;
5749
5750         if (info->mti_big_lmm) {
5751                 OBD_FREE_LARGE(info->mti_big_lmm, info->mti_big_lmmsize);
5752                 info->mti_big_lmm = NULL;
5753                 info->mti_big_lmmsize = 0;
5754         }
5755         OBD_FREE_PTR(info);
5756 }
5757
5758 /* context key: mdt_thread_key */
5759 LU_CONTEXT_KEY_DEFINE(mdt, LCT_MD_THREAD);
5760
5761 struct lu_ucred *mdt_ucred(const struct mdt_thread_info *info)
5762 {
5763         return lu_ucred(info->mti_env);
5764 }
5765
5766 struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
5767 {
5768         return lu_ucred_check(info->mti_env);
5769 }
5770
5771 /**
5772  * Enable/disable COS (Commit On Sharing).
5773  *
5774  * Set/Clear the COS flag in mdt options.
5775  *
5776  * \param mdt mdt device
5777  * \param val 0 disables COS, other values enable COS
5778  */
5779 void mdt_enable_cos(struct mdt_device *mdt, int val)
5780 {
5781         struct lu_env env;
5782         int rc;
5783
5784         mdt->mdt_opts.mo_cos = !!val;
5785         rc = lu_env_init(&env, LCT_LOCAL);
5786         if (unlikely(rc != 0)) {
5787                 CWARN("%s: lu_env initialization failed, cannot "
5788                       "sync: rc = %d\n", mdt_obd_name(mdt), rc);
5789                 return;
5790         }
5791         mdt_device_sync(&env, mdt);
5792         lu_env_fini(&env);
5793 }
5794
5795 /**
5796  * Check COS (Commit On Sharing) status.
5797  *
5798  * Return COS flag status.
5799  *
5800  * \param mdt mdt device
5801  */
5802 int mdt_cos_is_enabled(struct mdt_device *mdt)
5803 {
5804         return mdt->mdt_opts.mo_cos != 0;
5805 }
5806
5807 static struct lu_device_type_operations mdt_device_type_ops = {
5808         .ldto_device_alloc = mdt_device_alloc,
5809         .ldto_device_free  = mdt_device_free,
5810         .ldto_device_fini  = mdt_device_fini
5811 };
5812
5813 static struct lu_device_type mdt_device_type = {
5814         .ldt_tags     = LU_DEVICE_MD,
5815         .ldt_name     = LUSTRE_MDT_NAME,
5816         .ldt_ops      = &mdt_device_type_ops,
5817         .ldt_ctx_tags = LCT_MD_THREAD
5818 };
5819
5820 static int __init mdt_mod_init(void)
5821 {
5822         int rc;
5823
5824         CLASSERT(sizeof("0x0123456789ABCDEF:0x01234567:0x01234567") ==
5825                  FID_NOBRACE_LEN + 1);
5826         CLASSERT(sizeof("[0x0123456789ABCDEF:0x01234567:0x01234567]") ==
5827                  FID_LEN + 1);
5828         rc = lu_kmem_init(mdt_caches);
5829         if (rc)
5830                 return rc;
5831
5832         rc = mds_mod_init();
5833         if (rc)
5834                 GOTO(lu_fini, rc);
5835
5836         rc = class_register_type(&mdt_obd_device_ops, NULL, true, NULL,
5837                                  LUSTRE_MDT_NAME, &mdt_device_type);
5838         if (rc)
5839                 GOTO(mds_fini, rc);
5840 lu_fini:
5841         if (rc)
5842                 lu_kmem_fini(mdt_caches);
5843 mds_fini:
5844         if (rc)
5845                 mds_mod_exit();
5846         return rc;
5847 }
5848
5849 static void __exit mdt_mod_exit(void)
5850 {
5851         class_unregister_type(LUSTRE_MDT_NAME);
5852         mds_mod_exit();
5853         lu_kmem_fini(mdt_caches);
5854 }
5855
5856 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
5857 MODULE_DESCRIPTION("Lustre Metadata Target ("LUSTRE_MDT_NAME")");
5858 MODULE_VERSION(LUSTRE_VERSION_STRING);
5859 MODULE_LICENSE("GPL");
5860
5861 module_init(mdt_mod_init);
5862 module_exit(mdt_mod_exit);