lustre/osd-ldiskfs/osd_compat.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/osd/osd_compat.c
  32  *
  33  * on-disk structure for managing /O
  34  *
  35  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  36  */
  37
  38 /* prerequisite for linux/xattr.h */
  39 #include <linux/types.h>
  40 /* prerequisite for linux/xattr.h */
  41 #include <linux/fs.h>
  42 /* XATTR_{REPLACE,CREATE} */
  43 #include <linux/xattr.h>
  44
  45 /*
  46  * struct OBD_{ALLOC,FREE}*()
  47  */
  48 #include <obd_support.h>
  49 #include <libcfs/libcfs.h>
  50
  51 #include "osd_internal.h"
  52 #include "osd_oi.h"
  53
  54 #ifndef HAVE_INODE_LOCK_SHARED
  55 #define inode_lock_shared(dir) inode_lock(dir)
  56 #define inode_unlock_shared(dir) inode_unlock(dir)
  57 #endif
  58
  59 static void osd_push_ctxt(const struct osd_device *dev,
  60                           struct lvfs_run_ctxt *newctxt,
  61                           struct lvfs_run_ctxt *save)
  62 {
  63         OBD_SET_CTXT_MAGIC(newctxt);
  64         newctxt->pwdmnt = dev->od_mnt;
  65         newctxt->pwd = dev->od_mnt->mnt_root;
  66         newctxt->umask = current_umask();
  67         newctxt->dt = NULL;
  68
  69         push_ctxt(save, newctxt);
  70 }
  71
  72 struct dentry *osd_lookup_one_len_common(struct osd_device *dev,
  73                                          const char *name,
  74                                          struct dentry *base, int len,
  75                                          enum oi_check_flags flags)
  76 {
  77         struct dentry *dchild;
  78
  79         /*
  80          * We can't use inode_is_locked() directly since we can't know
  81          * if the current thread context took the lock earlier or if
  82          * another thread context took the lock. OI_LOCKED tells us
  83          * if the current thread context has already taken the lock.
  84          */
  85         if (!(flags & OI_LOCKED)) {
  86                 /* If another thread took this lock already we will
  87                  * just have to wait until the other thread is done.
  88                  */
  89                 inode_lock(base->d_inode);
  90                 dchild = lookup_one_len(name, base, len);
  91                 inode_unlock(base->d_inode);
  92         } else {
  93                 /* This thread context already has taken the lock.
  94                  * Other threads will have to wait until we are done.
  95                  */
  96                 dchild = lookup_one_len(name, base, len);
  97         }
  98         if (IS_ERR(dchild))
  99                 return dchild;
 100
 101         if (dchild->d_inode && unlikely(is_bad_inode(dchild->d_inode))) {
 102                 CERROR("%s: bad inode returned %lu/%u: rc = -ENOENT\n",
 103                        osd_name(dev), dchild->d_inode->i_ino,
 104                        dchild->d_inode->i_generation);
 105                 dput(dchild);
 106                 dchild = ERR_PTR(-ENOENT);
 107         }
 108
 109         return dchild;
 110 }
 111
 112 /**
 113  * osd_lookup_one_len_unlocked
 114  *
 115  * @dev:        obd device we are searching
 116  * @name:       pathname component to lookup
 117  * @base:       base directory to lookup from
 118  * @len:        maximum length @len should be interpreted to
 119  *
 120  * Unlike osd_lookup_one_len, this should be called without the parent
 121  * i_mutex held, and will take the i_mutex itself.
 122  */
 123 struct dentry *osd_lookup_one_len_unlocked(struct osd_device *dev,
 124                                            const char *name,
 125                                            struct dentry *base, int len)
 126 {
 127         return osd_lookup_one_len_common(dev, name, base, len, ~OI_LOCKED);
 128 }
 129
 130 /**
 131  * osd_lookup_one_len - lookup single pathname component
 132  *
 133  * @dev:        obd device we are searching
 134  * @name:       pathname component to lookup
 135  * @base:       base directory to lookup from
 136  * @len:        maximum length @len should be interpreted to
 137  *
 138  * The caller must hold inode lock
 139  */
 140 struct dentry *osd_lookup_one_len(struct osd_device *dev, const char *name,
 141                                   struct dentry *base, int len)
 142 {
 143         return osd_lookup_one_len_common(dev, name, base, len, OI_LOCKED);
 144 }
 145
 146 /* utility to make a directory */
 147 static struct dentry *
 148 simple_mkdir(const struct lu_env *env, struct osd_device *osd,
 149              struct dentry *dir, const struct lu_fid *fid,
 150              const char *name, __u32 compat, int mode, bool *created)
 151 {
 152         struct osd_thread_info *info = osd_oti_get(env);
 153         struct lu_fid *tfid = &info->oti_fid3;
 154         struct inode *inode;
 155         struct dentry *dchild;
 156         int err = 0;
 157
 158         ENTRY;
 159
 160         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 161         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 162         dchild = osd_lookup_one_len_unlocked(osd, name, dir, strlen(name));
 163         if (IS_ERR(dchild))
 164                 RETURN(dchild);
 165
 166         inode = dchild->d_inode;
 167         if (inode) {
 168                 struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;
 169                 int old_mode = inode->i_mode;
 170
 171                 if (created)
 172                         *created = false;
 173
 174                 if (!S_ISDIR(old_mode)) {
 175                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 176                                inode->i_ino, inode->i_generation, old_mode);
 177                         GOTO(out_err, err = -ENOTDIR);
 178                 }
 179
 180                 if (unlikely(osd->od_dt_dev.dd_rdonly))
 181                         RETURN(dchild);
 182
 183                 /* Fixup directory permissions if necessary */
 184                 if ((old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 185                         CDEBUG(D_CONFIG,
 186                                "fixing permissions on %s from %o to %o\n",
 187                                name, old_mode, mode);
 188                         inode->i_mode = (mode & S_IALLUGO) |
 189                                         (old_mode & ~S_IALLUGO);
 190                         mark_inode_dirty(inode);
 191                 }
 192
 193                 err = osd_get_lma(info, inode, &info->oti_obj_dentry,
 194                                   &info->oti_ost_attrs);
 195                 if (err == -ENODATA)
 196                         goto set_fid;
 197
 198                 if (err)
 199                         GOTO(out_err, err);
 200
 201                 if ((fid && !lu_fid_eq(fid, &lma->lma_self_fid)) ||
 202                     lma->lma_compat != compat)
 203                         goto set_fid;
 204
 205                 RETURN(dchild);
 206         }
 207
 208         err = vfs_mkdir(&nop_mnt_idmap, dir->d_inode, dchild, mode);
 209         if (err)
 210                 GOTO(out_err, err);
 211
 212         inode = dchild->d_inode;
 213         if (created)
 214                 *created = true;
 215
 216 set_fid:
 217         if (fid)
 218                 *tfid = *fid;
 219         else
 220                 lu_igif_build(tfid, inode->i_ino, inode->i_generation);
 221         err = osd_ea_fid_set(info, inode, tfid, compat, 0);
 222         if (err)
 223                 GOTO(out_err, err);
 224
 225         RETURN(dchild);
 226
 227 out_err:
 228         dput(dchild);
 229         return ERR_PTR(err);
 230 }
 231
 232 static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 233 {
 234         struct lr_server_data lsd;
 235         struct dentry *dlast;
 236         loff_t off;
 237         int rc = 0;
 238         int count = OBJ_SUBDIR_COUNT;
 239
 240         ENTRY;
 241
 242         dlast = osd_lookup_one_len_unlocked(osd, LAST_RCVD, osd_sb(osd)->s_root,
 243                                             strlen(LAST_RCVD));
 244         if (IS_ERR(dlast))
 245                 return PTR_ERR(dlast);
 246         else if (dlast->d_inode == NULL)
 247                 goto out;
 248
 249         off = 0;
 250         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 251         if (rc == sizeof(lsd)) {
 252                 CDEBUG(D_INFO,
 253                       "read last_rcvd header, uuid = %s, subdir count = %d\n",
 254                       lsd.lsd_uuid, lsd.lsd_subdir_count);
 255                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 256                         count = le16_to_cpu(lsd.lsd_subdir_count);
 257         } else if (rc != 0) {
 258                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 259                 if (rc > 0)
 260                         rc = -EFAULT;
 261                 dput(dlast);
 262                 return rc;
 263         }
 264 out:
 265         dput(dlast);
 266         LASSERT(count > 0);
 267         return count;
 268 }
 269
 270 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 271 {
 272         struct lvfs_run_ctxt new;
 273         struct lvfs_run_ctxt save;
 274         struct dentry *parent;
 275         struct osd_mdobj_map *omm;
 276         struct dentry *d;
 277         struct osd_thread_info *info = osd_oti_get(env);
 278         struct lu_fid *fid = &info->oti_fid3;
 279         int rc = 0;
 280
 281         ENTRY;
 282
 283         OBD_ALLOC_PTR(dev->od_mdt_map);
 284         if (dev->od_mdt_map == NULL)
 285                 RETURN(-ENOMEM);
 286
 287         omm = dev->od_mdt_map;
 288
 289         parent = osd_sb(dev)->s_root;
 290         osd_push_ctxt(dev, &new, &save);
 291
 292         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 293         d = simple_mkdir(env, dev, parent, fid, REMOTE_PARENT_DIR,
 294                          LMAC_NOT_IN_OI, 0755, NULL);
 295         if (IS_ERR(d))
 296                 GOTO(cleanup, rc = PTR_ERR(d));
 297
 298         omm->omm_remote_parent = d;
 299
 300         GOTO(cleanup, rc = 0);
 301
 302 cleanup:
 303         pop_ctxt(&save, &new);
 304         if (rc) {
 305                 if (omm->omm_remote_parent != NULL)
 306                         dput(omm->omm_remote_parent);
 307                 OBD_FREE_PTR(omm);
 308                 dev->od_mdt_map = NULL;
 309         }
 310         return rc;
 311 }
 312
 313 static void osd_mdt_fini(struct osd_device *osd)
 314 {
 315         struct osd_mdobj_map *omm = osd->od_mdt_map;
 316
 317         if (omm == NULL)
 318                 return;
 319
 320         if (omm->omm_remote_parent)
 321                 dput(omm->omm_remote_parent);
 322
 323         OBD_FREE_PTR(omm);
 324         osd->od_ost_map = NULL;
 325 }
 326
 327 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 328                              struct osd_object *obj, struct osd_thandle *oh)
 329 {
 330         struct osd_mdobj_map *omm = osd->od_mdt_map;
 331         struct osd_thread_info *oti = osd_oti_get(env);
 332         struct lustre_mdt_attrs *lma = &oti->oti_ost_attrs.loa_lma;
 333         char *name = oti->oti_name;
 334         struct osd_thread_info *info = osd_oti_get(env);
 335         struct dentry *dentry;
 336         struct dentry *parent;
 337         int rc;
 338
 339         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_NO_AGENTENT))
 340                 RETURN(0);
 341
 342         /*
 343          * Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 344          * can identify this object quickly
 345          */
 346         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 347                          &oti->oti_ost_attrs);
 348         if (rc)
 349                 RETURN(rc);
 350
 351         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 352         lustre_lma_swab(lma);
 353         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 354                              sizeof(*lma), XATTR_REPLACE);
 355         if (rc)
 356                 RETURN(rc);
 357
 358         parent = omm->omm_remote_parent;
 359         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 360         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 361                                            name, strlen(name));
 362         inode_lock(parent->d_inode);
 363         rc = osd_ldiskfs_add_entry(info, osd, oh->ot_handle, dentry,
 364                                    obj->oo_inode, NULL);
 365         if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 366                 osd_ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 367         else if (unlikely(rc == -EEXIST))
 368                 rc = 0;
 369         if (!rc)
 370                 lu_object_set_agent_entry(&obj->oo_dt.do_lu);
 371         CDEBUG(D_INODE, "%s: create agent entry for %s: rc = %d\n",
 372                osd_name(osd), name, rc);
 373         mark_inode_dirty(parent->d_inode);
 374         inode_unlock(parent->d_inode);
 375         RETURN(rc);
 376 }
 377
 378 int osd_delete_from_remote_parent(const struct lu_env *env,
 379                                   struct osd_device *osd,
 380                                   struct osd_object *obj,
 381                                   struct osd_thandle *oh, bool destroy)
 382 {
 383         struct osd_mdobj_map *omm = osd->od_mdt_map;
 384         struct osd_thread_info *oti = osd_oti_get(env);
 385         struct lustre_mdt_attrs *lma = &oti->oti_ost_attrs.loa_lma;
 386         char *name = oti->oti_name;
 387         struct dentry *dentry;
 388         struct dentry *parent;
 389         struct ldiskfs_dir_entry_2 *de;
 390         struct buffer_head *bh;
 391         int rc;
 392
 393         parent = omm->omm_remote_parent;
 394         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 395         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 396                                            name, strlen(name));
 397         inode_lock(parent->d_inode);
 398         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 399                                     NULL, NULL);
 400         if (IS_ERR(bh)) {
 401                 inode_unlock(parent->d_inode);
 402                 rc = PTR_ERR(bh);
 403                 if (unlikely(rc == -ENOENT))
 404                         rc = 0;
 405         } else {
 406                 rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode,
 407                                           de, bh);
 408                 if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 409                         osd_ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 410                 mark_inode_dirty(parent->d_inode);
 411                 inode_unlock(parent->d_inode);
 412                 brelse(bh);
 413                 CDEBUG(D_INODE, "%s: remove agent entry for %s: rc = %d\n",
 414                        osd_name(osd), name, rc);
 415         }
 416
 417         if (destroy || rc) {
 418                 if (!rc)
 419                         lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 420
 421                 RETURN(rc);
 422         }
 423
 424         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 425                          &oti->oti_ost_attrs);
 426         if (rc)
 427                 RETURN(rc);
 428
 429         /* Get rid of REMOTE_PARENT flag from incompat */
 430         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 431         lustre_lma_swab(lma);
 432         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 433                              sizeof(*lma), XATTR_REPLACE);
 434         if (!rc)
 435                 lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 436         RETURN(rc);
 437 }
 438
 439 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 440                                 struct osd_device *osd,
 441                                 const struct lu_fid *fid,
 442                                 struct osd_inode_id *id)
 443 {
 444         struct osd_mdobj_map *omm = osd->od_mdt_map;
 445         char *name = oti->oti_name;
 446         struct dentry *parent;
 447         struct dentry *dentry;
 448         struct ldiskfs_dir_entry_2 *de;
 449         struct buffer_head *bh;
 450         int rc;
 451
 452         ENTRY;
 453
 454         if (unlikely(osd->od_is_ost))
 455                 RETURN(-ENOENT);
 456
 457         parent = omm->omm_remote_parent;
 458         sprintf(name, DFID_NOBRACE, PFID(fid));
 459         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 460                                            name, strlen(name));
 461         inode_lock(parent->d_inode);
 462         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 463                                     NULL, NULL);
 464         if (IS_ERR(bh)) {
 465                 rc = PTR_ERR(bh);
 466         } else {
 467                 struct inode *inode;
 468
 469                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 470                 brelse(bh);
 471                 inode = osd_iget(oti, osd, id);
 472                 if (IS_ERR(inode)) {
 473                         rc = PTR_ERR(inode);
 474                         if (rc == -ESTALE)
 475                                 rc = -ENOENT;
 476                 } else {
 477                         iput(inode);
 478                         rc = 0;
 479                 }
 480         }
 481         inode_unlock(parent->d_inode);
 482         if (rc == 0)
 483                 osd_add_oi_cache(oti, osd, id, fid);
 484         RETURN(rc);
 485 }
 486
 487 /*
 488  * directory structure on legacy OST:
 489  *
 490  * O/<seq>/d0-31/<objid>
 491  * O/<seq>/LAST_ID
 492  * last_rcvd
 493  * LAST_GROUP
 494  * CONFIGS
 495  *
 496  */
 497 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 498 {
 499         struct lvfs_run_ctxt new;
 500         struct lvfs_run_ctxt save;
 501         struct dentry *d;
 502         int rc;
 503         bool created = false;
 504
 505         ENTRY;
 506
 507         OBD_ALLOC_PTR(dev->od_ost_map);
 508         if (dev->od_ost_map == NULL)
 509                 RETURN(-ENOMEM);
 510
 511         /* to get subdir count from last_rcvd */
 512         rc = osd_last_rcvd_subdir_count(dev);
 513         if (rc < 0)
 514                 GOTO(cleanup_alloc, rc);
 515
 516         dev->od_ost_map->om_subdir_count = rc;
 517         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 518         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 519         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 520
 521         osd_push_ctxt(dev, &new, &save);
 522         d = simple_mkdir(env, dev, osd_sb(dev)->s_root, NULL, "O",
 523                          LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0755, &created);
 524         if (IS_ERR(d))
 525                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 526
 527         if (created)
 528                 /* It is quite probably that the device is new formatted. */
 529                 dev->od_maybe_new = 1;
 530
 531         dev->od_ost_map->om_root = d;
 532
 533         pop_ctxt(&save, &new);
 534         RETURN(0);
 535
 536 cleanup_ctxt:
 537         pop_ctxt(&save, &new);
 538 cleanup_alloc:
 539         OBD_FREE_PTR(dev->od_ost_map);
 540         return rc;
 541 }
 542
 543 static void osd_seq_free(struct osd_obj_seq *osd_seq)
 544 {
 545         int j;
 546
 547         if (osd_seq->oos_dirs) {
 548                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 549                         if (osd_seq->oos_dirs[j])
 550                                 dput(osd_seq->oos_dirs[j]);
 551                 }
 552                 OBD_FREE_PTR_ARRAY(osd_seq->oos_dirs,
 553                                    osd_seq->oos_subdir_count);
 554         }
 555
 556         if (osd_seq->oos_root)
 557                 dput(osd_seq->oos_root);
 558
 559         OBD_FREE_PTR(osd_seq);
 560 }
 561
 562 static void osd_ost_fini(struct osd_device *osd)
 563 {
 564         struct osd_obj_seq *osd_seq;
 565         struct osd_obj_seq *tmp;
 566         struct osd_obj_map *map = osd->od_ost_map;
 567
 568         ENTRY;
 569
 570         if (map == NULL)
 571                 return;
 572
 573         write_lock(&map->om_seq_list_lock);
 574         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 575                                  oos_seq_list) {
 576                 list_del_init(&osd_seq->oos_seq_list);
 577                 write_unlock(&map->om_seq_list_lock);
 578                 osd_seq_free(osd_seq);
 579                 write_lock(&map->om_seq_list_lock);
 580         }
 581         write_unlock(&map->om_seq_list_lock);
 582         if (map->om_root)
 583                 dput(map->om_root);
 584         OBD_FREE_PTR(map);
 585         osd->od_ost_map = NULL;
 586         EXIT;
 587 }
 588
 589 static int osd_index_backup_dir_init(const struct lu_env *env,
 590                                      struct osd_device *dev)
 591 {
 592         struct lu_fid *fid = &osd_oti_get(env)->oti_fid;
 593         struct lvfs_run_ctxt new;
 594         struct lvfs_run_ctxt save;
 595         struct dentry *dentry;
 596         int rc = 0;
 597
 598         ENTRY;
 599
 600         lu_local_obj_fid(fid, INDEX_BACKUP_OID);
 601         osd_push_ctxt(dev, &new, &save);
 602         dentry = simple_mkdir(env, dev, osd_sb(dev)->s_root, fid,
 603                               INDEX_BACKUP_DIR, LMAC_NOT_IN_OI, 0755, NULL);
 604         if (IS_ERR(dentry)) {
 605                 rc = PTR_ERR(dentry);
 606         } else {
 607                 dev->od_index_backup_inode = igrab(dentry->d_inode);
 608                 dput(dentry);
 609         }
 610         pop_ctxt(&save, &new);
 611
 612         RETURN(rc);
 613 }
 614
 615 static void osd_index_backup_dir_fini(struct osd_device *dev)
 616 {
 617         iput(dev->od_index_backup_inode);
 618         dev->od_index_backup_inode = NULL;
 619 }
 620
 621 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 622 {
 623         int rc;
 624         bool mdt_init = false;
 625
 626         ENTRY;
 627
 628         rc = osd_ost_init(env, dev);
 629         if (rc)
 630                 RETURN(rc);
 631
 632         if (!dev->od_is_ost) {
 633                 rc = osd_mdt_init(env, dev);
 634                 if (rc) {
 635                         osd_ost_fini(dev);
 636                         RETURN(rc);
 637                 }
 638
 639                 mdt_init = true;
 640         }
 641
 642         rc = osd_index_backup_dir_init(env, dev);
 643         if (rc) {
 644                 osd_ost_fini(dev);
 645                 if (mdt_init)
 646                         osd_mdt_fini(dev);
 647         }
 648
 649         RETURN(rc);
 650 }
 651
 652 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 653 {
 654         struct osd_obj_seq *osd_seq;
 655
 656         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 657                 if (osd_seq->oos_seq == seq)
 658                         return osd_seq;
 659         }
 660         return NULL;
 661 }
 662
 663 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 664 {
 665         struct osd_obj_seq *osd_seq;
 666
 667         read_lock(&map->om_seq_list_lock);
 668         osd_seq = osd_seq_find_locked(map, seq);
 669         read_unlock(&map->om_seq_list_lock);
 670         return osd_seq;
 671 }
 672
 673 void osd_obj_map_fini(struct osd_device *dev)
 674 {
 675         osd_index_backup_dir_fini(dev);
 676         osd_ost_fini(dev);
 677         osd_mdt_fini(dev);
 678 }
 679
 680 /**
 681  * Update the specified OI mapping.
 682  *
 683  * \retval   1, changed nothing
 684  * \retval   0, changed successfully
 685  * \retval -ve, on error
 686  */
 687 static int osd_obj_update_entry(struct osd_thread_info *info,
 688                                 struct osd_device *osd,
 689                                 struct dentry *dir, const char *name,
 690                                 const struct lu_fid *fid,
 691                                 const struct osd_inode_id *id,
 692                                 handle_t *th)
 693 {
 694         struct inode *parent = dir->d_inode;
 695         struct dentry *child;
 696         struct ldiskfs_dir_entry_2 *de;
 697         struct buffer_head *bh;
 698         struct inode *inode;
 699         struct dentry *dentry = &info->oti_obj_dentry;
 700         struct osd_inode_id *oi_id = &info->oti_id3;
 701         struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;
 702         struct lu_fid *oi_fid = &lma->lma_self_fid;
 703         int rc;
 704
 705         ENTRY;
 706
 707         LASSERT(th != NULL);
 708         LASSERT(th->h_transaction != NULL);
 709
 710         child = &info->oti_child_dentry;
 711         child->d_parent = dir;
 712         child->d_name.hash = 0;
 713         child->d_name.name = name;
 714         child->d_name.len = strlen(name);
 715
 716         dquot_initialize(parent);
 717         inode_lock(parent);
 718         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 719         if (IS_ERR(bh))
 720                 GOTO(out, rc = PTR_ERR(bh));
 721
 722         if (le32_to_cpu(de->inode) == id->oii_ino)
 723                 GOTO(out, rc = 1);
 724
 725         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 726         inode = osd_iget(info, osd, oi_id);
 727         if (IS_ERR(inode)) {
 728                 rc = PTR_ERR(inode);
 729                 if (rc == -ENOENT || rc == -ESTALE)
 730                         goto update;
 731                 GOTO(out, rc);
 732         }
 733
 734         rc = osd_get_lma(info, inode, dentry, &info->oti_ost_attrs);
 735         if (rc == -ENODATA) {
 736                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 737                 if (rc > 0 || rc == -ENODATA) {
 738                         oi_fid = NULL;
 739                         rc = 0;
 740                 }
 741         }
 742         iput(inode);
 743
 744         if (rc != 0)
 745                 GOTO(out, rc);
 746
 747         /*
 748          * If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 749          * either a crashed object or a uninitialized one. Replace it.
 750          */
 751         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
 752                 CERROR("%s: the FID "DFID" is used by two objects: "
 753                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 754                        oi_id->oii_ino, oi_id->oii_gen,
 755                        id->oii_ino, id->oii_gen);
 756                 GOTO(out, rc = -EEXIST);
 757         }
 758
 759         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
 760                 __u32 idx1 = fid_idif_ost_idx(fid);
 761                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
 762                 struct ost_id *ostid = &info->oti_ostid;
 763                 struct lu_fid *tfid = &info->oti_fid3;
 764
 765                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
 766                          "invalid given FID "DFID", not match the "
 767                          "device index %u\n", PFID(fid), osd->od_index);
 768
 769                 if (idx1 != idx2) {
 770                         if (idx1 == 0 && idx2 == osd->od_index) {
 771                                 fid_to_ostid(fid, ostid);
 772                                 ostid_to_fid(tfid, ostid, idx2);
 773                                 if (lu_fid_eq(tfid, oi_fid)) {
 774                                         CERROR("%s: the FID "DFID" is used by "
 775                                                "two objects(2): %u/%u %u/%u\n",
 776                                                osd_name(osd), PFID(fid),
 777                                                oi_id->oii_ino, oi_id->oii_gen,
 778                                                id->oii_ino, id->oii_gen);
 779
 780                                         GOTO(out, rc = -EEXIST);
 781                                 }
 782                         } else if (idx2 == 0 && idx1 == osd->od_index) {
 783                                 fid_to_ostid(oi_fid, ostid);
 784                                 ostid_to_fid(tfid, ostid, idx1);
 785                                 if (lu_fid_eq(tfid, fid)) {
 786                                         CERROR("%s: the FID "DFID" is used by "
 787                                                "two objects(2): %u/%u %u/%u\n",
 788                                                osd_name(osd), PFID(fid),
 789                                                oi_id->oii_ino, oi_id->oii_gen,
 790                                                id->oii_ino, id->oii_gen);
 791
 792                                         GOTO(out, rc = -EEXIST);
 793                                 }
 794                         }
 795                 }
 796         }
 797
 798 update:
 799         /*
 800          * There may be temporary inconsistency: On one hand, the new
 801          * object may be referenced by multiple entries, which is out
 802          * of our control unless we traverse the whole /O completely,
 803          * which is non-flat order and inefficient, should be avoided;
 804          * On the other hand, the old object may become orphan if it
 805          * is still valid. Since it was referenced by an invalid entry,
 806          * making it as invisible temporary may be not worse. OI scrub
 807          * will process it later.
 808          */
 809         rc = osd_ldiskfs_journal_get_write_access(th, parent->i_sb, bh,
 810                                                   LDISKFS_JTR_NONE);
 811         if (rc != 0)
 812                 GOTO(out, rc);
 813
 814         de->inode = cpu_to_le32(id->oii_ino);
 815         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 816
 817         GOTO(out, rc);
 818
 819 out:
 820         if (!IS_ERR(bh))
 821                 brelse(bh);
 822         inode_unlock(parent);
 823         return rc;
 824 }
 825
 826 int osd_obj_del_entry(struct osd_thread_info *info, struct osd_device *osd,
 827                       struct dentry *dird, char *name, int namelen,
 828                       handle_t *th)
 829 {
 830         struct ldiskfs_dir_entry_2 *de;
 831         struct buffer_head *bh;
 832         struct dentry *child;
 833         struct inode *dir = dird->d_inode;
 834         int rc;
 835
 836         ENTRY;
 837
 838         LASSERT(th != NULL);
 839         LASSERT(th->h_transaction != NULL);
 840
 841         child = &info->oti_child_dentry;
 842         child->d_name.hash = 0;
 843         child->d_name.name = name;
 844         child->d_name.len = namelen;
 845         child->d_parent = dird;
 846         child->d_inode = NULL;
 847
 848         dquot_initialize(dir);
 849         inode_lock(dir);
 850         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 851         if (IS_ERR(bh)) {
 852                 rc = PTR_ERR(bh);
 853         } else {
 854                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 855                 brelse(bh);
 856         }
 857         inode_unlock(dir);
 858
 859         RETURN(rc);
 860 }
 861
 862 static int osd_obj_add_entry(struct osd_thread_info *info,
 863                              struct osd_device *osd,
 864                              struct dentry *dir, char *name,
 865                              const struct osd_inode_id *id,
 866                              handle_t *th)
 867 {
 868         struct dentry *child;
 869         struct inode *inode;
 870         int rc;
 871
 872         ENTRY;
 873
 874         if (CFS_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 875                 RETURN(0);
 876
 877         LASSERT(th != NULL);
 878         LASSERT(th->h_transaction != NULL);
 879
 880         inode = info->oti_inode;
 881         if (unlikely(inode == NULL)) {
 882                 struct ldiskfs_inode_info *lii;
 883
 884                 OBD_ALLOC_PTR(lii);
 885                 if (lii == NULL)
 886                         RETURN(-ENOMEM);
 887                 inode = info->oti_inode = &lii->vfs_inode;
 888         }
 889
 890         inode->i_sb = osd_sb(osd);
 891         osd_id_to_inode(inode, id);
 892         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 893
 894         child = &info->oti_child_dentry;
 895         child->d_name.hash = 0;
 896         child->d_name.name = name;
 897         child->d_name.len = strlen(name);
 898         child->d_parent = dir;
 899         child->d_inode = inode;
 900
 901         if (CFS_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 902                 inode->i_ino++;
 903
 904         dquot_initialize(dir->d_inode);
 905         inode_lock(dir->d_inode);
 906         rc = osd_ldiskfs_add_entry(info, osd, th, child, inode, NULL);
 907         inode_unlock(dir->d_inode);
 908
 909         RETURN(rc);
 910 }
 911
 912 /**
 913  * Use %llu for legacy OST sequences, but use %llx for new
 914  * sequences names, so that the O/{seq}/dN/{oid} more closely
 915  * follows the DFID/PFID format. This makes it easier to map from
 916  * debug messages to objects in the future, and the legacy space
 917  * of FID_SEQ_OST_MDT0 will be unused in the future.
 918  **/
 919 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 920 {
 921         snprintf(seq_name, name_size,
 922                  (fid_seq_is_rsvd(seq) ||
 923                   fid_seq_is_mdt0(seq)) ? "%llu" : "%llx",
 924                  fid_seq_is_idif(seq) ? 0 : seq);
 925 }
 926
 927 /* external locking is required */
 928 static int osd_seq_load_locked(struct osd_thread_info *info,
 929                                struct osd_device *osd,
 930                                struct osd_obj_seq *osd_seq)
 931 {
 932         struct osd_obj_map *map = osd->od_ost_map;
 933         struct dentry *seq_dir;
 934         int rc = 0;
 935         int i;
 936         char dir_name[32];
 937
 938         ENTRY;
 939
 940         if (osd_seq->oos_root != NULL)
 941                 RETURN(0);
 942
 943         LASSERT(map);
 944         LASSERT(map->om_root);
 945
 946         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 947
 948         seq_dir = simple_mkdir(info->oti_env, osd, map->om_root, NULL, dir_name,
 949                                LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0755, NULL);
 950         if (IS_ERR(seq_dir))
 951                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 952         else if (seq_dir->d_inode == NULL)
 953                 GOTO(out_put, rc = -EFAULT);
 954
 955         osd_seq->oos_root = seq_dir;
 956
 957         LASSERT(osd_seq->oos_dirs == NULL);
 958         OBD_ALLOC_PTR_ARRAY(osd_seq->oos_dirs, osd_seq->oos_subdir_count);
 959         if (osd_seq->oos_dirs == NULL)
 960                 GOTO(out_put, rc = -ENOMEM);
 961
 962         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 963                 struct dentry   *dir;
 964
 965                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 966                 dir = simple_mkdir(info->oti_env, osd, osd_seq->oos_root, NULL,
 967                                    dir_name, LMAC_NOT_IN_OI | LMAC_FID_ON_OST,
 968                                    0700, NULL);
 969                 if (IS_ERR(dir)) {
 970                         GOTO(out_free, rc = PTR_ERR(dir));
 971                 } else if (dir->d_inode == NULL) {
 972                         dput(dir);
 973                         GOTO(out_free, rc = -EFAULT);
 974                 }
 975
 976                 osd_seq->oos_dirs[i] = dir;
 977         }
 978
 979         if (rc != 0) {
 980 out_free:
 981                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 982                         if (osd_seq->oos_dirs[i] != NULL)
 983                                 dput(osd_seq->oos_dirs[i]);
 984                 }
 985                 OBD_FREE_PTR_ARRAY(osd_seq->oos_dirs,
 986                                    osd_seq->oos_subdir_count);
 987 out_put:
 988                 dput(seq_dir);
 989                 osd_seq->oos_root = NULL;
 990         }
 991 out_err:
 992         RETURN(rc);
 993 }
 994
 995 struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 996                                  struct osd_device *osd, u64 seq)
 997 {
 998         struct osd_obj_map *map;
 999         struct osd_obj_seq *osd_seq;
1000         int rc = 0;
1001
1002         ENTRY;
1003
1004         map = osd->od_ost_map;
1005         LASSERT(map);
1006         LASSERT(map->om_root);
1007
1008         osd_seq = osd_seq_find(map, seq);
1009         if (likely(osd_seq != NULL))
1010                 RETURN(osd_seq);
1011
1012         /* Serializing init process */
1013         mutex_lock(&map->om_dir_init_mutex);
1014
1015         /* Check whether the seq has been added */
1016         read_lock(&map->om_seq_list_lock);
1017         osd_seq = osd_seq_find_locked(map, seq);
1018         if (osd_seq != NULL) {
1019                 read_unlock(&map->om_seq_list_lock);
1020                 GOTO(cleanup, rc = 0);
1021         }
1022         read_unlock(&map->om_seq_list_lock);
1023
1024         OBD_ALLOC_PTR(osd_seq);
1025         if (osd_seq == NULL)
1026                 GOTO(cleanup, rc = -ENOMEM);
1027
1028         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
1029         osd_seq->oos_seq = seq;
1030         /*
1031          * Init subdir count to be 32, but each seq can have
1032          * different subdir count
1033          */
1034         osd_seq->oos_subdir_count = map->om_subdir_count;
1035         rc = osd_seq_load_locked(info, osd, osd_seq);
1036         if (rc != 0)
1037                 GOTO(cleanup, rc);
1038
1039         write_lock(&map->om_seq_list_lock);
1040         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
1041         write_unlock(&map->om_seq_list_lock);
1042
1043 cleanup:
1044         mutex_unlock(&map->om_dir_init_mutex);
1045         if (rc != 0) {
1046                 if (osd_seq != NULL)
1047                         OBD_FREE_PTR(osd_seq);
1048                 RETURN(ERR_PTR(rc));
1049         }
1050
1051         RETURN(osd_seq);
1052 }
1053
1054 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
1055                        const struct lu_fid *fid, struct osd_inode_id *id)
1056 {
1057         struct osd_obj_map *map;
1058         struct osd_obj_seq *osd_seq;
1059         struct dentry *d_seq;
1060         struct dentry *child;
1061         struct ost_id *ostid = &info->oti_ostid;
1062         int dirn;
1063         char name[32];
1064         struct ldiskfs_dir_entry_2 *de;
1065         struct buffer_head *bh;
1066         struct inode *dir;
1067         struct inode *inode;
1068
1069         ENTRY;
1070
1071         /* on the very first lookup we find and open directories */
1072         map = dev->od_ost_map;
1073         LASSERT(map);
1074         LASSERT(map->om_root);
1075
1076         fid_to_ostid(fid, ostid);
1077         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
1078         if (IS_ERR(osd_seq))
1079                 RETURN(PTR_ERR(osd_seq));
1080
1081         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1082         d_seq = osd_seq->oos_dirs[dirn];
1083         LASSERT(d_seq);
1084
1085         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1086
1087         child = &info->oti_child_dentry;
1088         child->d_parent = d_seq;
1089         child->d_name.hash = 0;
1090         child->d_name.name = name;
1091         /* XXX: we can use rc from sprintf() instead of strlen() */
1092         child->d_name.len = strlen(name);
1093
1094         dir = d_seq->d_inode;
1095         inode_lock_shared(dir);
1096         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
1097         inode_unlock_shared(dir);
1098
1099         if (IS_ERR(bh))
1100                 RETURN(PTR_ERR(bh));
1101
1102         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
1103         brelse(bh);
1104
1105         inode = osd_iget(info, dev, id);
1106         if (IS_ERR(inode)) {
1107                 int rc = PTR_ERR(inode);
1108
1109                 RETURN(rc == -ENOENT ? -ESTALE : rc);
1110         }
1111
1112         iput(inode);
1113         RETURN(0);
1114 }
1115
1116 int osd_obj_map_insert(struct osd_thread_info *info,
1117                        struct osd_device *osd,
1118                        const struct lu_fid *fid,
1119                        const struct osd_inode_id *id,
1120                        handle_t *th)
1121 {
1122         struct osd_obj_map *map;
1123         struct osd_obj_seq *osd_seq;
1124         struct dentry *d;
1125         struct ost_id *ostid = &info->oti_ostid;
1126         u64 oid;
1127         int dirn, rc = 0;
1128         char name[32];
1129
1130         ENTRY;
1131
1132         map = osd->od_ost_map;
1133         LASSERT(map);
1134
1135         /* map fid to seq:objid */
1136         fid_to_ostid(fid, ostid);
1137
1138         oid = ostid_id(ostid);
1139         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1140         if (IS_ERR(osd_seq))
1141                 RETURN(PTR_ERR(osd_seq));
1142
1143         dirn = oid & (osd_seq->oos_subdir_count - 1);
1144         d = osd_seq->oos_dirs[dirn];
1145         LASSERT(d);
1146
1147         osd_oid_name(name, sizeof(name), fid, oid);
1148
1149 again:
1150         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1151         if (rc == -EEXIST) {
1152                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1153                 if (unlikely(rc == -ENOENT))
1154                         goto again;
1155
1156                 if (unlikely(rc == 1))
1157                         RETURN(0);
1158         }
1159
1160         RETURN(rc);
1161 }
1162
1163 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1164                        const struct lu_fid *fid, handle_t *th)
1165 {
1166         struct osd_obj_map *map;
1167         struct osd_obj_seq *osd_seq;
1168         struct dentry *d;
1169         struct ost_id *ostid = &info->oti_ostid;
1170         int dirn, rc = 0;
1171         char name[32];
1172
1173         ENTRY;
1174
1175         map = osd->od_ost_map;
1176         LASSERT(map);
1177
1178         /* map fid to seq:objid */
1179         fid_to_ostid(fid, ostid);
1180
1181         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1182         if (IS_ERR(osd_seq))
1183                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1184
1185         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1186         d = osd_seq->oos_dirs[dirn];
1187         LASSERT(d);
1188
1189         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1190         rc = osd_obj_del_entry(info, osd, d, name, strlen(name), th);
1191 cleanup:
1192         RETURN(rc);
1193 }
1194
1195 int osd_obj_map_update(struct osd_thread_info *info,
1196                        struct osd_device *osd,
1197                        const struct lu_fid *fid,
1198                        const struct osd_inode_id *id,
1199                        handle_t *th)
1200 {
1201         struct osd_obj_seq *osd_seq;
1202         struct dentry *d;
1203         struct ost_id *ostid = &info->oti_ostid;
1204         int dirn, rc = 0;
1205         char name[32];
1206
1207         ENTRY;
1208
1209         fid_to_ostid(fid, ostid);
1210         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1211         if (IS_ERR(osd_seq))
1212                 RETURN(PTR_ERR(osd_seq));
1213
1214         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1215         d = osd_seq->oos_dirs[dirn];
1216         LASSERT(d);
1217
1218         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1219         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1220
1221         RETURN(rc);
1222 }
1223
1224 int osd_obj_map_recover(struct osd_thread_info *info,
1225                         struct osd_device *osd,
1226                         struct inode *src_parent,
1227                         struct dentry *src_child,
1228                         const struct lu_fid *fid)
1229 {
1230         struct osd_obj_seq *osd_seq;
1231         struct dentry *tgt_parent;
1232         struct dentry *tgt_child = &info->oti_child_dentry;
1233         struct inode *dir;
1234         struct inode *inode = src_child->d_inode;
1235         struct ost_id *ostid = &info->oti_ostid;
1236         handle_t *jh;
1237         struct ldiskfs_dir_entry_2 *de;
1238         struct buffer_head *bh;
1239         char name[32];
1240         int dirn;
1241         int rc = 0;
1242
1243         ENTRY;
1244
1245         if (fid_is_last_id(fid)) {
1246                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1247                 if (IS_ERR(osd_seq))
1248                         RETURN(PTR_ERR(osd_seq));
1249
1250                 tgt_parent = osd_seq->oos_root;
1251                 tgt_child->d_name.name = "LAST_ID";
1252                 tgt_child->d_name.len = strlen("LAST_ID");
1253         } else {
1254                 fid_to_ostid(fid, ostid);
1255                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1256                 if (IS_ERR(osd_seq))
1257                         RETURN(PTR_ERR(osd_seq));
1258
1259                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1260                 tgt_parent = osd_seq->oos_dirs[dirn];
1261                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1262                 tgt_child->d_name.name = name;
1263                 tgt_child->d_name.len = strlen(name);
1264         }
1265         LASSERT(tgt_parent != NULL);
1266
1267         dir = tgt_parent->d_inode;
1268         tgt_child->d_name.hash = 0;
1269         tgt_child->d_parent = tgt_parent;
1270         tgt_child->d_inode = inode;
1271
1272         /* The non-initialized src_child may be destroyed. */
1273         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1274                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1275                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1276                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1277         if (IS_ERR(jh))
1278                 RETURN(PTR_ERR(jh));
1279
1280         dquot_initialize(src_parent);
1281         dquot_initialize(dir);
1282
1283         inode_lock(dir);
1284         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1285         if (!IS_ERR(bh)) {
1286                 /*
1287                  * XXX: If some other object occupied the same slot. And If such
1288                  *      inode is zero-sized and with SUID+SGID, then means it is
1289                  *      a new created one. Maybe we can remove it and insert the
1290                  *      original one back to the /O/<seq>/d<x>. But there are
1291                  *      something to be considered:
1292                  *
1293                  *      1) The OST-object under /lost+found has crashed LMA.
1294                  *         So it should not conflict with the current one.
1295                  *
1296                  *      2) There are race conditions that: someone may just want
1297                  *         to modify the current one. Even if the OI scrub takes
1298                  *         the object lock when remove the current one, it still
1299                  *         cause the modification to be lost becasue the target
1300                  *         has been removed when the RPC service thread waiting
1301                  *         for the lock.
1302                  *
1303                  *      So keep it there before we have suitable solution.
1304                  */
1305                 brelse(bh);
1306                 inode_unlock(dir);
1307                 ldiskfs_journal_stop(jh);
1308
1309                 rc = -EEXIST;
1310                 /* If the src object has never been modified, then remove it. */
1311                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1312                     inode->i_mode & S_ISGID) {
1313                         rc = vfs_unlink(&nop_mnt_idmap, src_parent, src_child);
1314                         if (unlikely(rc == -ENOENT))
1315                                 rc = 0;
1316                 }
1317                 if (rc)
1318                         RETURN(rc);
1319
1320                 jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1321                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1322                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1323                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1324                 if (IS_ERR(jh))
1325                         RETURN(PTR_ERR(jh));
1326                 inode_lock(dir);
1327         }
1328
1329         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1330                                     NULL, NULL);
1331         if (unlikely(IS_ERR(bh)))
1332                 GOTO(unlock, rc = PTR_ERR(bh));
1333
1334         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1335         brelse(bh);
1336         if (rc != 0)
1337                 GOTO(unlock, rc);
1338
1339         rc = osd_ldiskfs_add_entry(info, osd, jh, tgt_child, inode, NULL);
1340
1341         GOTO(unlock, rc);
1342
1343 unlock:
1344         inode_unlock(dir);
1345         ldiskfs_journal_stop(jh);
1346         return rc;
1347 }
1348
1349 static struct dentry *
1350 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1351                      const struct lu_fid *fid, char **name)
1352 {
1353         struct dentry *root = ERR_PTR(-ENOENT);
1354
1355         if (fid_is_last_id(fid)) {
1356                 struct osd_obj_seq *osd_seq;
1357
1358                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1359                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1360                 if (IS_ERR(osd_seq))
1361                         RETURN((struct dentry *)osd_seq);
1362
1363                 *name = "LAST_ID";
1364                 root = osd_seq->oos_root;
1365         } else {
1366                 *name = osd_lf_fid2name(fid);
1367                 if (*name == NULL)
1368                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1369                 else if ((*name)[0])
1370                         root = osd_sb(osd)->s_root;
1371         }
1372
1373         return root;
1374 }
1375
1376 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1377                         const struct lu_fid *fid, const struct osd_inode_id *id,
1378                         handle_t *th)
1379 {
1380         struct dentry *root;
1381         char *name = NULL;
1382         int rc;
1383
1384         ENTRY;
1385
1386         root = osd_object_spec_find(info, osd, fid, &name);
1387         if (!IS_ERR(root)) {
1388                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1389         } else {
1390                 rc = PTR_ERR(root);
1391                 if (rc == -ENOENT)
1392                         rc = 1;
1393         }
1394
1395         RETURN(rc);
1396 }
1397
1398 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1399                         const struct lu_fid *fid, const struct osd_inode_id *id,
1400                         handle_t *th)
1401 {
1402         struct dentry *root;
1403         char *name = NULL;
1404         int rc;
1405
1406         ENTRY;
1407
1408         root = osd_object_spec_find(info, osd, fid, &name);
1409         if (!IS_ERR(root)) {
1410                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1411         } else {
1412                 rc = PTR_ERR(root);
1413                 if (rc == -ENOENT)
1414                         rc = 0;
1415         }
1416
1417         RETURN(rc);
1418 }
1419
1420 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1421                         const struct lu_fid *fid, struct osd_inode_id *id,
1422                         enum oi_check_flags flags)
1423 {
1424         struct dentry *root;
1425         struct dentry *dentry;
1426         struct inode *inode;
1427         char *name = NULL;
1428         int rc = -ENOENT;
1429
1430         ENTRY;
1431
1432         if (fid_is_last_id(fid)) {
1433                 struct osd_obj_seq *osd_seq;
1434
1435                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1436                 if (IS_ERR(osd_seq))
1437                         RETURN(PTR_ERR(osd_seq));
1438                 root = osd_seq->oos_root;
1439                 name = "LAST_ID";
1440         } else {
1441                 root = osd_sb(osd)->s_root;
1442                 name = osd_lf_fid2name(fid);
1443                 if (name == NULL || strlen(name) == 0)
1444                         RETURN(-ENOENT);
1445         }
1446
1447         dentry = osd_lookup_one_len_common(osd, name, root, strlen(name),
1448                                            flags);
1449         if (!IS_ERR(dentry)) {
1450                 inode = dentry->d_inode;
1451                 if (inode) {
1452                         if (is_bad_inode(inode)) {
1453                                 rc = -EIO;
1454                         } else {
1455                                 osd_id_gen(id, inode->i_ino,
1456                                            inode->i_generation);
1457                                 rc = 0;
1458                         }
1459                 }
1460                 /*
1461                  * if dentry is accessible after osd_compat_spec_insert it
1462                  * will still contain NULL inode, so don't keep it in cache
1463                  */
1464                 d_invalidate(dentry);
1465                 dput(dentry);
1466         }
1467
1468         RETURN(rc);
1469 }