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.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) 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/osd/osd_compat.c
  37  *
  38  * on-disk structure for managing /O
  39  *
  40  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  41  */
  42
  43 /* LUSTRE_VERSION_CODE */
  44 #include <lustre_ver.h>
  45 /* prerequisite for linux/xattr.h */
  46 #include <linux/types.h>
  47 /* prerequisite for linux/xattr.h */
  48 #include <linux/fs.h>
  49 /* XATTR_{REPLACE,CREATE} */
  50 #include <linux/xattr.h>
  51
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  * OBD_FAIL_CHECK
  55  */
  56 #include <obd_support.h>
  57
  58 #include "osd_internal.h"
  59 #include "osd_oi.h"
  60
  61 static void osd_push_ctxt(const struct osd_device *dev,
  62                           struct lvfs_run_ctxt *newctxt,
  63                           struct lvfs_run_ctxt *save)
  64 {
  65         OBD_SET_CTXT_MAGIC(newctxt);
  66         newctxt->pwdmnt = dev->od_mnt;
  67         newctxt->pwd = dev->od_mnt->mnt_root;
  68         newctxt->fs = get_ds();
  69
  70         push_ctxt(save, newctxt, NULL);
  71 }
  72
  73 static void osd_pop_ctxt(const struct osd_device *dev,
  74                          struct lvfs_run_ctxt *new,
  75                          struct lvfs_run_ctxt *save)
  76 {
  77         pop_ctxt(save, new, NULL);
  78 }
  79
  80 /* utility to make a directory */
  81 static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
  82                                    const char *name, int mode, int fix)
  83 {
  84         struct dentry *dchild;
  85         int err = 0;
  86         ENTRY;
  87
  88         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  89         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  90         dchild = ll_lookup_one_len(name, dir, strlen(name));
  91         if (IS_ERR(dchild))
  92                 GOTO(out_up, dchild);
  93
  94         if (dchild->d_inode) {
  95                 int old_mode = dchild->d_inode->i_mode;
  96                 if (!S_ISDIR(old_mode)) {
  97                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  98                                dchild->d_inode->i_ino,
  99                                dchild->d_inode->i_generation, old_mode);
 100                         GOTO(out_err, err = -ENOTDIR);
 101                 }
 102
 103                 /* Fixup directory permissions if necessary */
 104                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 105                         CDEBUG(D_CONFIG,
 106                                "fixing permissions on %s from %o to %o\n",
 107                                name, old_mode, mode);
 108                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 109                                                   (old_mode & ~S_IALLUGO);
 110                         mark_inode_dirty(dchild->d_inode);
 111                 }
 112                 GOTO(out_up, dchild);
 113         }
 114
 115         err = vfs_mkdir(dir->d_inode, dchild, mode);
 116         if (err)
 117                 GOTO(out_err, err);
 118
 119         RETURN(dchild);
 120
 121 out_err:
 122         dput(dchild);
 123         dchild = ERR_PTR(err);
 124 out_up:
 125         return dchild;
 126 }
 127
 128 int osd_last_rcvd_subdir_count(struct osd_device *osd)
 129 {
 130         struct lr_server_data lsd;
 131         struct dentry        *dlast;
 132         loff_t                off;
 133         int                   rc = 0;
 134         int                   count = OBJ_SUBDIR_COUNT;
 135
 136         ENTRY;
 137
 138         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 139                                   strlen(LAST_RCVD));
 140         if (IS_ERR(dlast))
 141                 return PTR_ERR(dlast);
 142         else if (dlast->d_inode == NULL)
 143                 goto out;
 144
 145         off = 0;
 146         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 147         if (rc == sizeof(lsd)) {
 148                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 149                        "subdir count = %d\n", lsd.lsd_uuid,
 150                        lsd.lsd_subdir_count);
 151                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 152                         count = le16_to_cpu(lsd.lsd_subdir_count);
 153         } else if (rc != 0) {
 154                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 155                 if (rc > 0)
 156                         rc = -EFAULT;
 157                 dput(dlast);
 158                 return rc;
 159         }
 160 out:
 161         dput(dlast);
 162         LASSERT(count > 0);
 163         return count;
 164 }
 165
 166 static const char remote_parent_dir[] = "REMOTE_PARENT_DIR";
 167 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 168 {
 169         struct lvfs_run_ctxt    new;
 170         struct lvfs_run_ctxt    save;
 171         struct dentry           *parent;
 172         struct osd_mdobj_map    *omm;
 173         struct dentry           *d;
 174         struct osd_thread_info  *info = osd_oti_get(env);
 175         struct lu_fid           *fid = &info->oti_fid3;
 176         int                     rc = 0;
 177         ENTRY;
 178
 179         OBD_ALLOC_PTR(dev->od_mdt_map);
 180         if (dev->od_mdt_map == NULL)
 181                 RETURN(-ENOMEM);
 182
 183         omm = dev->od_mdt_map;
 184
 185         parent = osd_sb(dev)->s_root;
 186         osd_push_ctxt(dev, &new, &save);
 187
 188         d = simple_mkdir(parent, dev->od_mnt, remote_parent_dir,
 189                          0755, 1);
 190         if (IS_ERR(d))
 191                 GOTO(cleanup, rc = PTR_ERR(d));
 192
 193         ldiskfs_set_inode_state(d->d_inode, LDISKFS_STATE_LUSTRE_NO_OI);
 194         omm->omm_remote_parent = d;
 195
 196         /* Set LMA for remote parent inode */
 197         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 198         rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
 199
 200         GOTO(cleanup, rc);
 201
 202 cleanup:
 203         pop_ctxt(&save, &new, NULL);
 204         if (rc) {
 205                 if (omm->omm_remote_parent != NULL)
 206                         dput(omm->omm_remote_parent);
 207                 OBD_FREE_PTR(omm);
 208                 dev->od_mdt_map = NULL;
 209         }
 210         return rc;
 211 }
 212
 213 static void osd_mdt_fini(struct osd_device *osd)
 214 {
 215         struct osd_mdobj_map *omm = osd->od_mdt_map;
 216
 217         if (omm == NULL)
 218                 return;
 219
 220         if (omm->omm_remote_parent)
 221                 dput(omm->omm_remote_parent);
 222
 223         OBD_FREE_PTR(omm);
 224         osd->od_ost_map = NULL;
 225 }
 226
 227 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 228                              struct osd_object *obj, struct osd_thandle *oh)
 229 {
 230         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 231         struct osd_thread_info  *oti = osd_oti_get(env);
 232         struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
 233         char                    *name = oti->oti_name;
 234         struct dentry           *dentry;
 235         struct dentry           *parent;
 236         int                     rc;
 237
 238         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 239          * can identify this object quickly */
 240         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 241         if (rc != 0)
 242                 RETURN(rc);
 243
 244         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 245         lustre_lma_swab(lma);
 246         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 247                              sizeof(*lma), XATTR_REPLACE);
 248         if (rc != 0)
 249                 RETURN(rc);
 250
 251         parent = omm->omm_remote_parent;
 252         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 253         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 254                                            name, strlen(name));
 255         mutex_lock(&parent->d_inode->i_mutex);
 256         rc = osd_ldiskfs_add_entry(oh->ot_handle, dentry, obj->oo_inode,
 257                                    NULL);
 258         CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
 259                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 260         ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 261         mark_inode_dirty(parent->d_inode);
 262         mutex_unlock(&parent->d_inode->i_mutex);
 263         RETURN(rc);
 264 }
 265
 266 int osd_delete_from_remote_parent(const struct lu_env *env,
 267                                   struct osd_device *osd,
 268                                   struct osd_object *obj,
 269                                   struct osd_thandle *oh)
 270 {
 271         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 272         struct osd_thread_info     *oti = osd_oti_get(env);
 273         struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
 274         char                       *name = oti->oti_name;
 275         struct dentry              *dentry;
 276         struct dentry              *parent;
 277         struct ldiskfs_dir_entry_2 *de;
 278         struct buffer_head         *bh;
 279         int                        rc;
 280
 281         /* Check lma to see whether it is remote object */
 282         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 283         if (rc != 0)
 284                 RETURN(rc);
 285
 286         if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
 287                 RETURN(0);
 288
 289         parent = omm->omm_remote_parent;
 290         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 291         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 292                                            name, strlen(name));
 293         mutex_lock(&parent->d_inode->i_mutex);
 294         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 295                                     NULL, NULL);
 296         if (bh == NULL) {
 297                 mutex_unlock(&parent->d_inode->i_mutex);
 298                 RETURN(-ENOENT);
 299         }
 300         CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
 301                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 302         rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
 303         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 304         mark_inode_dirty(parent->d_inode);
 305         mutex_unlock(&parent->d_inode->i_mutex);
 306         brelse(bh);
 307
 308         /* Get rid of REMOTE_PARENT flag from incompat */
 309         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 310         lustre_lma_swab(lma);
 311         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 312                              sizeof(*lma), XATTR_REPLACE);
 313         RETURN(rc);
 314 }
 315
 316 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 317                                 struct osd_device *osd,
 318                                 const struct lu_fid *fid,
 319                                 struct osd_inode_id *id)
 320 {
 321         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 322         char                        *name = oti->oti_name;
 323         struct dentry               *parent;
 324         struct dentry               *dentry;
 325         struct ldiskfs_dir_entry_2 *de;
 326         struct buffer_head         *bh;
 327         int                         rc;
 328         ENTRY;
 329
 330         parent = omm->omm_remote_parent;
 331         sprintf(name, DFID_NOBRACE, PFID(fid));
 332         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 333                                            name, strlen(name));
 334         mutex_lock(&parent->d_inode->i_mutex);
 335         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 336                                     NULL, NULL);
 337         if (bh == NULL) {
 338                 rc = -ENOENT;
 339         } else {
 340                 rc = 0;
 341                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 342                 brelse(bh);
 343         }
 344         mutex_unlock(&parent->d_inode->i_mutex);
 345         if (rc == 0)
 346                 osd_add_oi_cache(oti, osd, id, fid);
 347         RETURN(rc);
 348 }
 349
 350 /*
 351  * directory structure on legacy OST:
 352  *
 353  * O/<seq>/d0-31/<objid>
 354  * O/<seq>/LAST_ID
 355  * last_rcvd
 356  * LAST_GROUP
 357  * CONFIGS
 358  *
 359  */
 360 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 361 {
 362         struct lvfs_run_ctxt     new;
 363         struct lvfs_run_ctxt     save;
 364         struct dentry           *rootd = osd_sb(dev)->s_root;
 365         struct dentry           *d;
 366         struct osd_thread_info  *info = osd_oti_get(env);
 367         struct inode            *inode;
 368         struct lu_fid           *fid = &info->oti_fid3;
 369         int                      rc;
 370         ENTRY;
 371
 372         OBD_ALLOC_PTR(dev->od_ost_map);
 373         if (dev->od_ost_map == NULL)
 374                 RETURN(-ENOMEM);
 375
 376         /* to get subdir count from last_rcvd */
 377         rc = osd_last_rcvd_subdir_count(dev);
 378         if (rc < 0) {
 379                 OBD_FREE_PTR(dev->od_ost_map);
 380                 RETURN(rc);
 381         }
 382
 383         dev->od_ost_map->om_subdir_count = rc;
 384         rc = 0;
 385
 386         CFS_INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 387         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 388         sema_init(&dev->od_ost_map->om_dir_init_sem, 1);
 389
 390         osd_push_ctxt(dev, &new, &save);
 391
 392         d = ll_lookup_one_len("O", rootd, strlen("O"));
 393         if (IS_ERR(d))
 394                 GOTO(cleanup, rc = PTR_ERR(d));
 395         if (d->d_inode == NULL) {
 396                 dput(d);
 397                 /* The lookup() may be called again inside simple_mkdir().
 398                  * Since the repeated lookup() only be called for "/O" at
 399                  * mount time, it will not affect the whole performance. */
 400                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
 401                 if (IS_ERR(d))
 402                         GOTO(cleanup, rc = PTR_ERR(d));
 403
 404                 /* It is quite probably that the device is new formatted. */
 405                 dev->od_maybe_new = 1;
 406         }
 407
 408         inode = d->d_inode;
 409         ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI);
 410         dev->od_ost_map->om_root = d;
 411
 412         /* 'What the @fid is' is not imporatant, because the object
 413          * has no OI mapping, and only is visible inside the OSD.*/
 414         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 415         rc = osd_ea_fid_set(info, inode, fid,
 416                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 417
 418         GOTO(cleanup, rc);
 419
 420 cleanup:
 421         osd_pop_ctxt(dev, &new, &save);
 422         if (IS_ERR(d)) {
 423                 OBD_FREE_PTR(dev->od_ost_map);
 424                 RETURN(PTR_ERR(d));
 425         }
 426         return rc;
 427 }
 428
 429 static void osd_seq_free(struct osd_obj_map *map,
 430                          struct osd_obj_seq *osd_seq)
 431 {
 432         int j;
 433
 434         cfs_list_del_init(&osd_seq->oos_seq_list);
 435
 436         if (osd_seq->oos_dirs) {
 437                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 438                         if (osd_seq->oos_dirs[j])
 439                                 dput(osd_seq->oos_dirs[j]);
 440                 }
 441                 OBD_FREE(osd_seq->oos_dirs,
 442                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 443         }
 444
 445         if (osd_seq->oos_root)
 446                 dput(osd_seq->oos_root);
 447
 448         OBD_FREE_PTR(osd_seq);
 449 }
 450
 451 static void osd_ost_fini(struct osd_device *osd)
 452 {
 453         struct osd_obj_seq    *osd_seq;
 454         struct osd_obj_seq    *tmp;
 455         struct osd_obj_map    *map = osd->od_ost_map;
 456         ENTRY;
 457
 458         if (map == NULL)
 459                 return;
 460
 461         write_lock(&map->om_seq_list_lock);
 462         cfs_list_for_each_entry_safe(osd_seq, tmp,
 463                                      &map->om_seq_list,
 464                                      oos_seq_list) {
 465                 osd_seq_free(map, osd_seq);
 466         }
 467         write_unlock(&map->om_seq_list_lock);
 468         if (map->om_root)
 469                 dput(map->om_root);
 470         OBD_FREE_PTR(map);
 471         osd->od_ost_map = NULL;
 472         EXIT;
 473 }
 474
 475 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 476 {
 477         int rc;
 478         ENTRY;
 479
 480         /* prepare structures for OST */
 481         rc = osd_ost_init(env, dev);
 482         if (rc)
 483                 RETURN(rc);
 484
 485         /* prepare structures for MDS */
 486         rc = osd_mdt_init(env, dev);
 487
 488         RETURN(rc);
 489 }
 490
 491 struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, obd_seq seq)
 492 {
 493         struct osd_obj_seq *osd_seq;
 494
 495         cfs_list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 496                 if (osd_seq->oos_seq == seq)
 497                         return osd_seq;
 498         }
 499         return NULL;
 500 }
 501
 502 struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, obd_seq seq)
 503 {
 504         struct osd_obj_seq *osd_seq;
 505
 506         read_lock(&map->om_seq_list_lock);
 507         osd_seq = osd_seq_find_locked(map, seq);
 508         read_unlock(&map->om_seq_list_lock);
 509         return osd_seq;
 510 }
 511
 512 void osd_obj_map_fini(struct osd_device *dev)
 513 {
 514         osd_ost_fini(dev);
 515         osd_mdt_fini(dev);
 516 }
 517
 518 /**
 519  * Update the specified OI mapping.
 520  *
 521  * \retval   1, changed nothing
 522  * \retval   0, changed successfully
 523  * \retval -ve, on error
 524  */
 525 static int osd_obj_update_entry(struct osd_thread_info *info,
 526                                 struct osd_device *osd,
 527                                 struct dentry *dir, const char *name,
 528                                 const struct lu_fid *fid,
 529                                 const struct osd_inode_id *id,
 530                                 handle_t *th)
 531 {
 532         struct inode               *parent = dir->d_inode;
 533         struct dentry              *child;
 534         struct ldiskfs_dir_entry_2 *de;
 535         struct buffer_head         *bh;
 536         struct inode               *inode;
 537         struct dentry              *dentry = &info->oti_obj_dentry;
 538         struct osd_inode_id        *oi_id  = &info->oti_id3;
 539         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 540         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 541         int                         rc;
 542         ENTRY;
 543
 544         LASSERT(th != NULL);
 545         LASSERT(th->h_transaction != NULL);
 546
 547         child = &info->oti_child_dentry;
 548         child->d_parent = dir;
 549         child->d_name.hash = 0;
 550         child->d_name.name = name;
 551         child->d_name.len = strlen(name);
 552
 553         ll_vfs_dq_init(parent);
 554         mutex_lock(&parent->i_mutex);
 555         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 556         if (bh == NULL)
 557                 GOTO(out, rc = -ENOENT);
 558
 559         if (le32_to_cpu(de->inode) == id->oii_ino)
 560                 GOTO(out, rc = 1);
 561
 562         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 563         inode = osd_iget(info, osd, oi_id);
 564         if (IS_ERR(inode)) {
 565                 rc = PTR_ERR(inode);
 566                 if (rc == -ENOENT || rc == -ESTALE)
 567                         goto update;
 568                 GOTO(out, rc);
 569         }
 570
 571         rc = osd_get_lma(info, inode, dentry, lma);
 572         if (rc == -ENODATA) {
 573                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 574                 if (rc > 0) {
 575                         oi_fid = NULL;
 576                         rc = 0;
 577                 }
 578         }
 579         iput(inode);
 580
 581         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 582          * either a crashed object or a uninitialized one. Replace it. */
 583         if (rc == -ENODATA || oi_fid == NULL)
 584                 goto update;
 585
 586         if (rc != 0)
 587                 GOTO(out, rc);
 588
 589         if (lu_fid_eq(fid, oi_fid)) {
 590                 CERROR("%s: the FID "DFID" is used by two objects: "
 591                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 592                        oi_id->oii_ino, oi_id->oii_gen,
 593                        id->oii_ino, id->oii_gen);
 594                 GOTO(out, rc = -EEXIST);
 595         }
 596
 597 update:
 598         /* There may be temporary inconsistency: On one hand, the new
 599          * object may be referenced by multiple entries, which is out
 600          * of our control unless we traverse the whole /O completely,
 601          * which is non-flat order and inefficient, should be avoided;
 602          * On the other hand, the old object may become orphan if it
 603          * is still valid. Since it was referenced by an invalid entry,
 604          * making it as invisible temporary may be not worse. OI scrub
 605          * will process it later. */
 606         rc = ldiskfs_journal_get_write_access(th, bh);
 607         if (rc != 0)
 608                 GOTO(out, rc);
 609
 610         de->inode = cpu_to_le32(id->oii_ino);
 611         rc = ldiskfs_journal_dirty_metadata(th, bh);
 612
 613         GOTO(out, rc);
 614
 615 out:
 616         brelse(bh);
 617         mutex_unlock(&parent->i_mutex);
 618         return rc;
 619 }
 620
 621 static int osd_obj_del_entry(struct osd_thread_info *info,
 622                              struct osd_device *osd,
 623                              struct dentry *dird, char *name,
 624                              handle_t *th)
 625 {
 626         struct ldiskfs_dir_entry_2 *de;
 627         struct buffer_head         *bh;
 628         struct dentry              *child;
 629         struct inode               *dir = dird->d_inode;
 630         int                         rc;
 631         ENTRY;
 632
 633         LASSERT(th != NULL);
 634         LASSERT(th->h_transaction != NULL);
 635
 636
 637         child = &info->oti_child_dentry;
 638         child->d_name.hash = 0;
 639         child->d_name.name = name;
 640         child->d_name.len = strlen(name);
 641         child->d_parent = dird;
 642         child->d_inode = NULL;
 643
 644         ll_vfs_dq_init(dir);
 645         mutex_lock(&dir->i_mutex);
 646         rc = -ENOENT;
 647         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 648         if (bh) {
 649                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 650                 brelse(bh);
 651         }
 652         mutex_unlock(&dir->i_mutex);
 653
 654         RETURN(rc);
 655 }
 656
 657 int osd_obj_add_entry(struct osd_thread_info *info,
 658                       struct osd_device *osd,
 659                       struct dentry *dir, char *name,
 660                       const struct osd_inode_id *id,
 661                       handle_t *th)
 662 {
 663         struct dentry *child;
 664         struct inode *inode;
 665         int rc;
 666
 667         ENTRY;
 668
 669         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 670                 RETURN(0);
 671
 672         LASSERT(th != NULL);
 673         LASSERT(th->h_transaction != NULL);
 674
 675         inode = &info->oti_inode;
 676         inode->i_sb = osd_sb(osd);
 677         osd_id_to_inode(inode, id);
 678         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 679
 680         child = &info->oti_child_dentry;
 681         child->d_name.hash = 0;
 682         child->d_name.name = name;
 683         child->d_name.len = strlen(name);
 684         child->d_parent = dir;
 685         child->d_inode = inode;
 686
 687         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 688                 inode->i_ino++;
 689
 690         ll_vfs_dq_init(dir->d_inode);
 691         mutex_lock(&dir->d_inode->i_mutex);
 692         rc = osd_ldiskfs_add_entry(th, child, inode, NULL);
 693         mutex_unlock(&dir->d_inode->i_mutex);
 694
 695         RETURN(rc);
 696 }
 697
 698 /**
 699  * Use LPU64 for legacy OST sequences, but use LPX64i for new
 700  * sequences names, so that the O/{seq}/dN/{oid} more closely
 701  * follows the DFID/PFID format. This makes it easier to map from
 702  * debug messages to objects in the future, and the legacy space
 703  * of FID_SEQ_OST_MDT0 will be unused in the future.
 704  **/
 705 static inline void osd_seq_name(char *seq_name, size_t name_size, obd_seq seq)
 706 {
 707         snprintf(seq_name, name_size,
 708                  (fid_seq_is_rsvd(seq) ||
 709                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
 710                  fid_seq_is_idif(seq) ? 0 : seq);
 711 }
 712
 713 static inline void osd_oid_name(char *name, size_t name_size,
 714                                 const struct lu_fid *fid, obd_id id)
 715 {
 716         snprintf(name, name_size,
 717                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 718                   fid_seq_is_mdt0(fid_seq(fid)) ||
 719                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 720 }
 721
 722 /* external locking is required */
 723 static int osd_seq_load_locked(struct osd_thread_info *info,
 724                                struct osd_device *osd,
 725                                struct osd_obj_seq *osd_seq)
 726 {
 727         struct osd_obj_map  *map = osd->od_ost_map;
 728         struct dentry       *seq_dir;
 729         struct inode        *inode;
 730         struct lu_fid       *fid = &info->oti_fid3;
 731         int                 rc = 0;
 732         int                 i;
 733         char                dir_name[32];
 734         ENTRY;
 735
 736         if (osd_seq->oos_root != NULL)
 737                 RETURN(0);
 738
 739         LASSERT(map);
 740         LASSERT(map->om_root);
 741
 742         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 743
 744         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 745         if (IS_ERR(seq_dir))
 746                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 747         else if (seq_dir->d_inode == NULL)
 748                 GOTO(out_put, rc = -EFAULT);
 749
 750         inode = seq_dir->d_inode;
 751         ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI);
 752         osd_seq->oos_root = seq_dir;
 753
 754         /* 'What the @fid is' is not imporatant, because the object
 755          * has no OI mapping, and only is visible inside the OSD.*/
 756         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 757         rc = osd_ea_fid_set(info, inode, fid,
 758                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 759         if (rc != 0)
 760                 GOTO(out_put, rc);
 761
 762         LASSERT(osd_seq->oos_dirs == NULL);
 763         OBD_ALLOC(osd_seq->oos_dirs,
 764                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 765         if (osd_seq->oos_dirs == NULL)
 766                 GOTO(out_put, rc = -ENOMEM);
 767
 768         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 769                 struct dentry   *dir;
 770
 771                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 772                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 773                                    0700, 1);
 774                 if (IS_ERR(dir)) {
 775                         GOTO(out_free, rc = PTR_ERR(dir));
 776                 } else if (dir->d_inode == NULL) {
 777                         dput(dir);
 778                         GOTO(out_free, rc = -EFAULT);
 779                 }
 780
 781                 inode = dir->d_inode;
 782                 ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI);
 783                 osd_seq->oos_dirs[i] = dir;
 784
 785                 /* 'What the @fid is' is not imporatant, because the object
 786                  * has no OI mapping, and only is visible inside the OSD.*/
 787                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 788                 rc = osd_ea_fid_set(info, inode, fid,
 789                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 790                 if (rc != 0)
 791                         GOTO(out_free, rc);
 792         }
 793
 794         if (rc != 0) {
 795 out_free:
 796                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 797                         if (osd_seq->oos_dirs[i] != NULL)
 798                                 dput(osd_seq->oos_dirs[i]);
 799                 }
 800                 OBD_FREE(osd_seq->oos_dirs,
 801                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 802 out_put:
 803                 dput(seq_dir);
 804                 osd_seq->oos_root = NULL;
 805         }
 806 out_err:
 807         RETURN(rc);
 808 }
 809
 810 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 811                                         struct osd_device *osd, obd_seq seq)
 812 {
 813         struct osd_obj_map      *map;
 814         struct osd_obj_seq      *osd_seq;
 815         int                     rc = 0;
 816         ENTRY;
 817
 818         map = osd->od_ost_map;
 819         LASSERT(map);
 820         LASSERT(map->om_root);
 821
 822         osd_seq = osd_seq_find(map, seq);
 823         if (likely(osd_seq != NULL))
 824                 RETURN(osd_seq);
 825
 826         /* Serializing init process */
 827         down(&map->om_dir_init_sem);
 828
 829         /* Check whether the seq has been added */
 830         read_lock(&map->om_seq_list_lock);
 831         osd_seq = osd_seq_find_locked(map, seq);
 832         if (osd_seq != NULL) {
 833                 read_unlock(&map->om_seq_list_lock);
 834                 GOTO(cleanup, rc = 0);
 835         }
 836         read_unlock(&map->om_seq_list_lock);
 837
 838         OBD_ALLOC_PTR(osd_seq);
 839         if (osd_seq == NULL)
 840                 GOTO(cleanup, rc = -ENOMEM);
 841
 842         CFS_INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 843         osd_seq->oos_seq = seq;
 844         /* Init subdir count to be 32, but each seq can have
 845          * different subdir count */
 846         osd_seq->oos_subdir_count = map->om_subdir_count;
 847         rc = osd_seq_load_locked(info, osd, osd_seq);
 848         if (rc != 0)
 849                 GOTO(cleanup, rc);
 850
 851         write_lock(&map->om_seq_list_lock);
 852         cfs_list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 853         write_unlock(&map->om_seq_list_lock);
 854
 855 cleanup:
 856         up(&map->om_dir_init_sem);
 857         if (rc != 0) {
 858                 if (osd_seq != NULL)
 859                         OBD_FREE_PTR(osd_seq);
 860                 RETURN(ERR_PTR(rc));
 861         }
 862
 863         RETURN(osd_seq);
 864 }
 865
 866 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 867                        const struct lu_fid *fid, struct osd_inode_id *id)
 868 {
 869         struct osd_obj_map              *map;
 870         struct osd_obj_seq              *osd_seq;
 871         struct dentry                   *d_seq;
 872         struct dentry                   *child;
 873         struct ost_id                   *ostid = &info->oti_ostid;
 874         int                             dirn;
 875         char                            name[32];
 876         struct ldiskfs_dir_entry_2      *de;
 877         struct buffer_head              *bh;
 878         struct inode                    *dir;
 879         struct inode                    *inode;
 880         ENTRY;
 881
 882         /* on the very first lookup we find and open directories */
 883
 884         map = dev->od_ost_map;
 885         LASSERT(map);
 886         LASSERT(map->om_root);
 887
 888         fid_to_ostid(fid, ostid);
 889         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 890         if (IS_ERR(osd_seq))
 891                 RETURN(PTR_ERR(osd_seq));
 892
 893         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 894         d_seq = osd_seq->oos_dirs[dirn];
 895         LASSERT(d_seq);
 896
 897         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 898
 899         child = &info->oti_child_dentry;
 900         child->d_parent = d_seq;
 901         child->d_name.hash = 0;
 902         child->d_name.name = name;
 903         /* XXX: we can use rc from sprintf() instead of strlen() */
 904         child->d_name.len = strlen(name);
 905
 906         dir = d_seq->d_inode;
 907         mutex_lock(&dir->i_mutex);
 908         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 909         mutex_unlock(&dir->i_mutex);
 910
 911         if (bh == NULL)
 912                 RETURN(-ENOENT);
 913
 914         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 915         brelse(bh);
 916
 917         inode = osd_iget(info, dev, id);
 918         if (IS_ERR(inode))
 919                 RETURN(PTR_ERR(inode));
 920
 921         iput(inode);
 922         RETURN(0);
 923 }
 924
 925 int osd_obj_map_insert(struct osd_thread_info *info,
 926                        struct osd_device *osd,
 927                        const struct lu_fid *fid,
 928                        const struct osd_inode_id *id,
 929                        handle_t *th)
 930 {
 931         struct osd_obj_map      *map;
 932         struct osd_obj_seq      *osd_seq;
 933         struct dentry           *d;
 934         struct ost_id           *ostid = &info->oti_ostid;
 935         obd_id                   oid;
 936         int                     dirn, rc = 0;
 937         char                    name[32];
 938         ENTRY;
 939
 940         map = osd->od_ost_map;
 941         LASSERT(map);
 942
 943         /* map fid to seq:objid */
 944         fid_to_ostid(fid, ostid);
 945
 946         oid = ostid_id(ostid);
 947         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 948         if (IS_ERR(osd_seq))
 949                 RETURN(PTR_ERR(osd_seq));
 950
 951         dirn = oid & (osd_seq->oos_subdir_count - 1);
 952         d = osd_seq->oos_dirs[dirn];
 953         LASSERT(d);
 954
 955         osd_oid_name(name, sizeof(name), fid, oid);
 956
 957 again:
 958         rc = osd_obj_add_entry(info, osd, d, name, id, th);
 959         if (rc == -EEXIST) {
 960                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
 961                 if (unlikely(rc == -ENOENT))
 962                         goto again;
 963
 964                 if (unlikely(rc == 1))
 965                         RETURN(0);
 966         }
 967
 968         RETURN(rc);
 969 }
 970
 971 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
 972                        const struct lu_fid *fid, handle_t *th)
 973 {
 974         struct osd_obj_map      *map;
 975         struct osd_obj_seq      *osd_seq;
 976         struct dentry           *d;
 977         struct ost_id           *ostid = &info->oti_ostid;
 978         int                     dirn, rc = 0;
 979         char                    name[32];
 980         ENTRY;
 981
 982         map = osd->od_ost_map;
 983         LASSERT(map);
 984
 985         /* map fid to seq:objid */
 986         fid_to_ostid(fid, ostid);
 987
 988         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 989         if (IS_ERR(osd_seq))
 990                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
 991
 992         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 993         d = osd_seq->oos_dirs[dirn];
 994         LASSERT(d);
 995
 996         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 997         rc = osd_obj_del_entry(info, osd, d, name, th);
 998 cleanup:
 999         RETURN(rc);
1000 }
1001
1002 int osd_obj_map_update(struct osd_thread_info *info,
1003                        struct osd_device *osd,
1004                        const struct lu_fid *fid,
1005                        const struct osd_inode_id *id,
1006                        handle_t *th)
1007 {
1008         struct osd_obj_seq      *osd_seq;
1009         struct dentry           *d;
1010         struct ost_id           *ostid = &info->oti_ostid;
1011         int                     dirn, rc = 0;
1012         char                    name[32];
1013         ENTRY;
1014
1015         fid_to_ostid(fid, ostid);
1016         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1017         if (IS_ERR(osd_seq))
1018                 RETURN(PTR_ERR(osd_seq));
1019
1020         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1021         d = osd_seq->oos_dirs[dirn];
1022         LASSERT(d);
1023
1024         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1025         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1026
1027         RETURN(rc);
1028 }
1029
1030 int osd_obj_map_recover(struct osd_thread_info *info,
1031                         struct osd_device *osd,
1032                         struct inode *src_parent,
1033                         struct dentry *src_child,
1034                         const struct lu_fid *fid)
1035 {
1036         struct osd_obj_seq         *osd_seq;
1037         struct dentry              *tgt_parent;
1038         struct dentry              *tgt_child = &info->oti_child_dentry;
1039         struct inode               *dir;
1040         struct inode               *inode     = src_child->d_inode;
1041         struct ost_id              *ostid     = &info->oti_ostid;
1042         handle_t                   *jh;
1043         struct ldiskfs_dir_entry_2 *de;
1044         struct buffer_head         *bh;
1045         char                        name[32];
1046         int                         dirn;
1047         int                         rc        = 0;
1048         ENTRY;
1049
1050         if (fid_is_last_id(fid)) {
1051                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1052                 if (IS_ERR(osd_seq))
1053                         RETURN(PTR_ERR(osd_seq));
1054
1055                 tgt_parent = osd_seq->oos_root;
1056                 tgt_child->d_name.name = "LAST_ID";
1057                 tgt_child->d_name.len = strlen("LAST_ID");
1058         } else {
1059                 fid_to_ostid(fid, ostid);
1060                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1061                 if (IS_ERR(osd_seq))
1062                         RETURN(PTR_ERR(osd_seq));
1063
1064                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1065                 tgt_parent = osd_seq->oos_dirs[dirn];
1066                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1067                 tgt_child->d_name.name = name;
1068                 tgt_child->d_name.len = strlen(name);
1069         }
1070         LASSERT(tgt_parent != NULL);
1071
1072         dir = tgt_parent->d_inode;
1073         tgt_child->d_name.hash = 0;
1074         tgt_child->d_parent = tgt_parent;
1075         tgt_child->d_inode = inode;
1076
1077         /* The non-initialized src_child may be destroyed. */
1078         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1079                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1080                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1081                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1082         if (IS_ERR(jh))
1083                 RETURN(PTR_ERR(jh));
1084
1085         ll_vfs_dq_init(src_parent);
1086         ll_vfs_dq_init(dir);
1087
1088         mutex_lock(&src_parent->i_mutex);
1089         mutex_lock(&dir->i_mutex);
1090         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1091         if (bh != NULL) {
1092                 /* XXX: If some other object occupied the same slot. And If such
1093                  *      inode is zero-sized and with SUID+SGID, then means it is
1094                  *      a new created one. Maybe we can remove it and insert the
1095                  *      original one back to the /O/<seq>/d<x>. But there are
1096                  *      something to be considered:
1097                  *
1098                  *      1) The OST-object under /lost+found has crashed LMA.
1099                  *         So it should not conflict with the current one.
1100                  *
1101                  *      2) There are race conditions that: someone may just want
1102                  *         to modify the current one. Even if the OI scrub takes
1103                  *         the object lock when remove the current one, it still
1104                  *         cause the modification to be lost becasue the target
1105                  *         has been removed when the RPC service thread waiting
1106                  *         for the lock.
1107                  *
1108                  *      So keep it there before we have suitable solution. */
1109                 brelse(bh);
1110                 mutex_unlock(&dir->i_mutex);
1111                 mutex_unlock(&src_parent->i_mutex);
1112                 ldiskfs_journal_stop(jh);
1113
1114                 rc = -EEXIST;
1115                 /* If the src object has never been modified, then remove it. */
1116                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1117                     inode->i_mode & S_ISGID) {
1118                         rc = vfs_unlink(src_parent, src_child);
1119                         if (unlikely(rc == -ENOENT))
1120                                 rc = 0;
1121                 }
1122                 RETURN(rc);
1123         }
1124
1125         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1126                                     NULL, NULL);
1127         if (unlikely(bh == NULL))
1128                 GOTO(unlock, rc = -ENOENT);
1129
1130         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1131         brelse(bh);
1132         if (rc != 0)
1133                 GOTO(unlock, rc);
1134
1135         rc = osd_ldiskfs_add_entry(jh, tgt_child, inode, NULL);
1136
1137         GOTO(unlock, rc);
1138
1139 unlock:
1140         mutex_unlock(&dir->i_mutex);
1141         mutex_unlock(&src_parent->i_mutex);
1142         ldiskfs_journal_stop(jh);
1143         return rc;
1144 }
1145
1146 static struct dentry *
1147 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1148                      const struct lu_fid *fid, char **name)
1149 {
1150         struct dentry *root = ERR_PTR(-ENOENT);
1151
1152         if (fid_is_last_id(fid)) {
1153                 struct osd_obj_seq *osd_seq;
1154
1155                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1156                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1157                 if (IS_ERR(osd_seq))
1158                         RETURN((struct dentry *)osd_seq);
1159
1160                 *name = "LAST_ID";
1161                 root = osd_seq->oos_root;
1162         } else {
1163                 *name = osd_lf_fid2name(fid);
1164                 if (*name == NULL)
1165                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1166                 else if ((*name)[0])
1167                         root = osd_sb(osd)->s_root;
1168         }
1169
1170         return root;
1171 }
1172
1173 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1174                         const struct lu_fid *fid, const struct osd_inode_id *id,
1175                         handle_t *th)
1176 {
1177         struct dentry   *root;
1178         char            *name;
1179         int              rc;
1180         ENTRY;
1181
1182         root = osd_object_spec_find(info, osd, fid, &name);
1183         if (!IS_ERR(root)) {
1184                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1185         } else {
1186                 rc = PTR_ERR(root);
1187                 if (rc == -ENOENT)
1188                         rc = 1;
1189         }
1190
1191         RETURN(rc);
1192 }
1193
1194 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1195                         const struct lu_fid *fid, const struct osd_inode_id *id,
1196                         handle_t *th)
1197 {
1198         struct dentry   *root;
1199         char            *name;
1200         int              rc;
1201         ENTRY;
1202
1203         root = osd_object_spec_find(info, osd, fid, &name);
1204         if (!IS_ERR(root)) {
1205                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1206         } else {
1207                 rc = PTR_ERR(root);
1208                 if (rc == -ENOENT)
1209                         rc = 0;
1210         }
1211
1212         RETURN(rc);
1213 }
1214
1215 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1216                         const struct lu_fid *fid, struct osd_inode_id *id)
1217 {
1218         struct dentry   *root;
1219         struct dentry   *dentry;
1220         struct inode    *inode;
1221         char            *name;
1222         int             rc = -ENOENT;
1223         ENTRY;
1224
1225         if (fid_is_last_id(fid)) {
1226                 struct osd_obj_seq *osd_seq;
1227
1228                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1229                 if (IS_ERR(osd_seq))
1230                         RETURN(PTR_ERR(osd_seq));
1231                 root = osd_seq->oos_root;
1232                 name = "LAST_ID";
1233         } else {
1234                 root = osd_sb(osd)->s_root;
1235                 name = osd_lf_fid2name(fid);
1236                 if (name == NULL || strlen(name) == 0)
1237                         RETURN(-ENOENT);
1238         }
1239
1240         dentry = ll_lookup_one_len(name, root, strlen(name));
1241         if (!IS_ERR(dentry)) {
1242                 inode = dentry->d_inode;
1243                 if (inode) {
1244                         if (is_bad_inode(inode)) {
1245                                 rc = -EIO;
1246                         } else {
1247                                 osd_id_gen(id, inode->i_ino,
1248                                            inode->i_generation);
1249                                 rc = 0;
1250                         }
1251                 }
1252                 /* if dentry is accessible after osd_compat_spec_insert it
1253                  * will still contain NULL inode, so don't keep it in cache */
1254                 d_invalidate(dentry);
1255                 dput(dentry);
1256         }
1257
1258         RETURN(rc);
1259 }