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, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/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         newctxt->umask = current_umask();
  70         newctxt->dt = NULL;
  71
  72         push_ctxt(save, newctxt);
  73 }
  74
  75 /* utility to make a directory */
  76 static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
  77                                    const char *name, int mode, int fix)
  78 {
  79         struct dentry *dchild;
  80         int err = 0;
  81         ENTRY;
  82
  83         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  84         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  85         dchild = ll_lookup_one_len(name, dir, strlen(name));
  86         if (IS_ERR(dchild))
  87                 GOTO(out_up, dchild);
  88
  89         if (dchild->d_inode) {
  90                 int old_mode = dchild->d_inode->i_mode;
  91                 if (!S_ISDIR(old_mode)) {
  92                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  93                                dchild->d_inode->i_ino,
  94                                dchild->d_inode->i_generation, old_mode);
  95                         GOTO(out_err, err = -ENOTDIR);
  96                 }
  97
  98                 /* Fixup directory permissions if necessary */
  99                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 100                         CDEBUG(D_CONFIG,
 101                                "fixing permissions on %s from %o to %o\n",
 102                                name, old_mode, mode);
 103                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 104                                                   (old_mode & ~S_IALLUGO);
 105                         mark_inode_dirty(dchild->d_inode);
 106                 }
 107                 GOTO(out_up, dchild);
 108         }
 109
 110         err = vfs_mkdir(dir->d_inode, dchild, mode);
 111         if (err)
 112                 GOTO(out_err, err);
 113
 114         RETURN(dchild);
 115
 116 out_err:
 117         dput(dchild);
 118         dchild = ERR_PTR(err);
 119 out_up:
 120         return dchild;
 121 }
 122
 123 static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 124 {
 125         struct lr_server_data lsd;
 126         struct dentry        *dlast;
 127         loff_t                off;
 128         int                   rc = 0;
 129         int                   count = OBJ_SUBDIR_COUNT;
 130
 131         ENTRY;
 132
 133         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 134                                   strlen(LAST_RCVD));
 135         if (IS_ERR(dlast))
 136                 return PTR_ERR(dlast);
 137         else if (dlast->d_inode == NULL)
 138                 goto out;
 139
 140         off = 0;
 141         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 142         if (rc == sizeof(lsd)) {
 143                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 144                        "subdir count = %d\n", lsd.lsd_uuid,
 145                        lsd.lsd_subdir_count);
 146                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 147                         count = le16_to_cpu(lsd.lsd_subdir_count);
 148         } else if (rc != 0) {
 149                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 150                 if (rc > 0)
 151                         rc = -EFAULT;
 152                 dput(dlast);
 153                 return rc;
 154         }
 155 out:
 156         dput(dlast);
 157         LASSERT(count > 0);
 158         return count;
 159 }
 160
 161 static const char remote_parent_dir[] = "REMOTE_PARENT_DIR";
 162 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 163 {
 164         struct lvfs_run_ctxt    new;
 165         struct lvfs_run_ctxt    save;
 166         struct dentry           *parent;
 167         struct osd_mdobj_map    *omm;
 168         struct dentry           *d;
 169         struct osd_thread_info  *info = osd_oti_get(env);
 170         struct lu_fid           *fid = &info->oti_fid3;
 171         int                     rc = 0;
 172         ENTRY;
 173
 174         OBD_ALLOC_PTR(dev->od_mdt_map);
 175         if (dev->od_mdt_map == NULL)
 176                 RETURN(-ENOMEM);
 177
 178         omm = dev->od_mdt_map;
 179
 180         parent = osd_sb(dev)->s_root;
 181         osd_push_ctxt(dev, &new, &save);
 182
 183         d = simple_mkdir(parent, dev->od_mnt, remote_parent_dir,
 184                          0755, 1);
 185         if (IS_ERR(d))
 186                 GOTO(cleanup, rc = PTR_ERR(d));
 187
 188         omm->omm_remote_parent = d;
 189
 190         /* Set LMA for remote parent inode */
 191         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 192         rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
 193
 194         GOTO(cleanup, rc);
 195
 196 cleanup:
 197         pop_ctxt(&save, &new);
 198         if (rc) {
 199                 if (omm->omm_remote_parent != NULL)
 200                         dput(omm->omm_remote_parent);
 201                 OBD_FREE_PTR(omm);
 202                 dev->od_mdt_map = NULL;
 203         }
 204         return rc;
 205 }
 206
 207 static void osd_mdt_fini(struct osd_device *osd)
 208 {
 209         struct osd_mdobj_map *omm = osd->od_mdt_map;
 210
 211         if (omm == NULL)
 212                 return;
 213
 214         if (omm->omm_remote_parent)
 215                 dput(omm->omm_remote_parent);
 216
 217         OBD_FREE_PTR(omm);
 218         osd->od_ost_map = NULL;
 219 }
 220
 221 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 222                              struct osd_object *obj, struct osd_thandle *oh)
 223 {
 224         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 225         struct osd_thread_info  *oti = osd_oti_get(env);
 226         struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
 227         char                    *name = oti->oti_name;
 228         struct dentry           *dentry;
 229         struct dentry           *parent;
 230         int                     rc;
 231
 232         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 233          * can identify this object quickly */
 234         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 235         if (rc != 0)
 236                 RETURN(rc);
 237
 238         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 239         lustre_lma_swab(lma);
 240         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 241                              sizeof(*lma), XATTR_REPLACE);
 242         if (rc != 0)
 243                 RETURN(rc);
 244
 245         parent = omm->omm_remote_parent;
 246         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 247         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 248                                            name, strlen(name));
 249         mutex_lock(&parent->d_inode->i_mutex);
 250         rc = osd_ldiskfs_add_entry(oh->ot_handle, dentry, obj->oo_inode,
 251                                    NULL);
 252         CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
 253                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 254         ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 255         mark_inode_dirty(parent->d_inode);
 256         mutex_unlock(&parent->d_inode->i_mutex);
 257         RETURN(rc);
 258 }
 259
 260 int osd_delete_from_remote_parent(const struct lu_env *env,
 261                                   struct osd_device *osd,
 262                                   struct osd_object *obj,
 263                                   struct osd_thandle *oh)
 264 {
 265         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 266         struct osd_thread_info     *oti = osd_oti_get(env);
 267         struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
 268         char                       *name = oti->oti_name;
 269         struct dentry              *dentry;
 270         struct dentry              *parent;
 271         struct ldiskfs_dir_entry_2 *de;
 272         struct buffer_head         *bh;
 273         int                        rc;
 274
 275         /* Check lma to see whether it is remote object */
 276         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 277         if (rc != 0)
 278                 RETURN(rc);
 279
 280         if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
 281                 RETURN(0);
 282
 283         parent = omm->omm_remote_parent;
 284         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 285         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 286                                            name, strlen(name));
 287         mutex_lock(&parent->d_inode->i_mutex);
 288         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 289                                     NULL, NULL);
 290         if (bh == NULL) {
 291                 mutex_unlock(&parent->d_inode->i_mutex);
 292                 RETURN(-ENOENT);
 293         }
 294         CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
 295                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 296         rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
 297         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 298         mark_inode_dirty(parent->d_inode);
 299         mutex_unlock(&parent->d_inode->i_mutex);
 300         brelse(bh);
 301
 302         /* Get rid of REMOTE_PARENT flag from incompat */
 303         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 304         lustre_lma_swab(lma);
 305         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 306                              sizeof(*lma), XATTR_REPLACE);
 307         RETURN(rc);
 308 }
 309
 310 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 311                                 struct osd_device *osd,
 312                                 const struct lu_fid *fid,
 313                                 struct osd_inode_id *id)
 314 {
 315         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 316         char                        *name = oti->oti_name;
 317         struct dentry               *parent;
 318         struct dentry               *dentry;
 319         struct ldiskfs_dir_entry_2 *de;
 320         struct buffer_head         *bh;
 321         int                         rc;
 322         ENTRY;
 323
 324         parent = omm->omm_remote_parent;
 325         sprintf(name, DFID_NOBRACE, PFID(fid));
 326         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 327                                            name, strlen(name));
 328         mutex_lock(&parent->d_inode->i_mutex);
 329         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 330                                     NULL, NULL);
 331         if (bh == NULL) {
 332                 rc = -ENOENT;
 333         } else {
 334                 rc = 0;
 335                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 336                 brelse(bh);
 337         }
 338         mutex_unlock(&parent->d_inode->i_mutex);
 339         if (rc == 0)
 340                 osd_add_oi_cache(oti, osd, id, fid);
 341         RETURN(rc);
 342 }
 343
 344 /*
 345  * directory structure on legacy OST:
 346  *
 347  * O/<seq>/d0-31/<objid>
 348  * O/<seq>/LAST_ID
 349  * last_rcvd
 350  * LAST_GROUP
 351  * CONFIGS
 352  *
 353  */
 354 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 355 {
 356         struct lvfs_run_ctxt     new;
 357         struct lvfs_run_ctxt     save;
 358         struct dentry           *rootd = osd_sb(dev)->s_root;
 359         struct dentry           *d;
 360         struct osd_thread_info  *info = osd_oti_get(env);
 361         struct inode            *inode;
 362         struct lu_fid           *fid = &info->oti_fid3;
 363         int                      rc;
 364         ENTRY;
 365
 366         OBD_ALLOC_PTR(dev->od_ost_map);
 367         if (dev->od_ost_map == NULL)
 368                 RETURN(-ENOMEM);
 369
 370         /* to get subdir count from last_rcvd */
 371         rc = osd_last_rcvd_subdir_count(dev);
 372         if (rc < 0)
 373                 GOTO(cleanup_alloc, rc);
 374
 375         dev->od_ost_map->om_subdir_count = rc;
 376         rc = 0;
 377
 378         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 379         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 380         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 381
 382         osd_push_ctxt(dev, &new, &save);
 383
 384         d = ll_lookup_one_len("O", rootd, strlen("O"));
 385         if (IS_ERR(d))
 386                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 387         if (d->d_inode == NULL) {
 388                 dput(d);
 389                 /* The lookup() may be called again inside simple_mkdir().
 390                  * Since the repeated lookup() only be called for "/O" at
 391                  * mount time, it will not affect the whole performance. */
 392                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
 393                 if (IS_ERR(d))
 394                         GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 395
 396                 /* It is quite probably that the device is new formatted. */
 397                 dev->od_maybe_new = 1;
 398         }
 399
 400         inode = d->d_inode;
 401         dev->od_ost_map->om_root = d;
 402
 403         /* 'What the @fid is' is not imporatant, because the object
 404          * has no OI mapping, and only is visible inside the OSD.*/
 405         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 406         rc = osd_ea_fid_set(info, inode, fid,
 407                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 408         if (rc)
 409                 GOTO(cleanup_dentry, rc);
 410
 411         pop_ctxt(&save, &new);
 412         RETURN(0);
 413
 414 cleanup_dentry:
 415         dput(d);
 416 cleanup_ctxt:
 417         pop_ctxt(&save, &new);
 418 cleanup_alloc:
 419         OBD_FREE_PTR(dev->od_ost_map);
 420         return rc;
 421 }
 422
 423 static void osd_seq_free(struct osd_obj_map *map,
 424                          struct osd_obj_seq *osd_seq)
 425 {
 426         int j;
 427
 428         list_del_init(&osd_seq->oos_seq_list);
 429
 430         if (osd_seq->oos_dirs) {
 431                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 432                         if (osd_seq->oos_dirs[j])
 433                                 dput(osd_seq->oos_dirs[j]);
 434                 }
 435                 OBD_FREE(osd_seq->oos_dirs,
 436                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 437         }
 438
 439         if (osd_seq->oos_root)
 440                 dput(osd_seq->oos_root);
 441
 442         OBD_FREE_PTR(osd_seq);
 443 }
 444
 445 static void osd_ost_fini(struct osd_device *osd)
 446 {
 447         struct osd_obj_seq    *osd_seq;
 448         struct osd_obj_seq    *tmp;
 449         struct osd_obj_map    *map = osd->od_ost_map;
 450         ENTRY;
 451
 452         if (map == NULL)
 453                 return;
 454
 455         write_lock(&map->om_seq_list_lock);
 456         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 457                                  oos_seq_list) {
 458                 osd_seq_free(map, osd_seq);
 459         }
 460         write_unlock(&map->om_seq_list_lock);
 461         if (map->om_root)
 462                 dput(map->om_root);
 463         OBD_FREE_PTR(map);
 464         osd->od_ost_map = NULL;
 465         EXIT;
 466 }
 467
 468 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 469 {
 470         int rc;
 471         ENTRY;
 472
 473         /* prepare structures for OST */
 474         rc = osd_ost_init(env, dev);
 475         if (rc)
 476                 RETURN(rc);
 477
 478         /* prepare structures for MDS */
 479         rc = osd_mdt_init(env, dev);
 480
 481         RETURN(rc);
 482 }
 483
 484 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 485 {
 486         struct osd_obj_seq *osd_seq;
 487
 488         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 489                 if (osd_seq->oos_seq == seq)
 490                         return osd_seq;
 491         }
 492         return NULL;
 493 }
 494
 495 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 496 {
 497         struct osd_obj_seq *osd_seq;
 498
 499         read_lock(&map->om_seq_list_lock);
 500         osd_seq = osd_seq_find_locked(map, seq);
 501         read_unlock(&map->om_seq_list_lock);
 502         return osd_seq;
 503 }
 504
 505 void osd_obj_map_fini(struct osd_device *dev)
 506 {
 507         osd_ost_fini(dev);
 508         osd_mdt_fini(dev);
 509 }
 510
 511 /**
 512  * Update the specified OI mapping.
 513  *
 514  * \retval   1, changed nothing
 515  * \retval   0, changed successfully
 516  * \retval -ve, on error
 517  */
 518 static int osd_obj_update_entry(struct osd_thread_info *info,
 519                                 struct osd_device *osd,
 520                                 struct dentry *dir, const char *name,
 521                                 const struct lu_fid *fid,
 522                                 const struct osd_inode_id *id,
 523                                 handle_t *th)
 524 {
 525         struct inode               *parent = dir->d_inode;
 526         struct dentry              *child;
 527         struct ldiskfs_dir_entry_2 *de;
 528         struct buffer_head         *bh;
 529         struct inode               *inode;
 530         struct dentry              *dentry = &info->oti_obj_dentry;
 531         struct osd_inode_id        *oi_id  = &info->oti_id3;
 532         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 533         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 534         int                         rc;
 535         ENTRY;
 536
 537         LASSERT(th != NULL);
 538         LASSERT(th->h_transaction != NULL);
 539
 540         child = &info->oti_child_dentry;
 541         child->d_parent = dir;
 542         child->d_name.hash = 0;
 543         child->d_name.name = name;
 544         child->d_name.len = strlen(name);
 545
 546         ll_vfs_dq_init(parent);
 547         mutex_lock(&parent->i_mutex);
 548         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 549         if (bh == NULL)
 550                 GOTO(out, rc = -ENOENT);
 551
 552         if (le32_to_cpu(de->inode) == id->oii_ino)
 553                 GOTO(out, rc = 1);
 554
 555         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 556         inode = osd_iget(info, osd, oi_id);
 557         if (IS_ERR(inode)) {
 558                 rc = PTR_ERR(inode);
 559                 if (rc == -ENOENT || rc == -ESTALE)
 560                         goto update;
 561                 GOTO(out, rc);
 562         }
 563
 564         rc = osd_get_lma(info, inode, dentry, lma);
 565         if (rc == -ENODATA) {
 566                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 567                 if (rc > 0) {
 568                         oi_fid = NULL;
 569                         rc = 0;
 570                 }
 571         }
 572         iput(inode);
 573
 574         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 575          * either a crashed object or a uninitialized one. Replace it. */
 576         if (rc == -ENODATA || oi_fid == NULL)
 577                 goto update;
 578
 579         if (rc != 0)
 580                 GOTO(out, rc);
 581
 582         if (lu_fid_eq(fid, oi_fid)) {
 583                 CERROR("%s: the FID "DFID" is used by two objects: "
 584                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 585                        oi_id->oii_ino, oi_id->oii_gen,
 586                        id->oii_ino, id->oii_gen);
 587                 GOTO(out, rc = -EEXIST);
 588         }
 589
 590 update:
 591         /* There may be temporary inconsistency: On one hand, the new
 592          * object may be referenced by multiple entries, which is out
 593          * of our control unless we traverse the whole /O completely,
 594          * which is non-flat order and inefficient, should be avoided;
 595          * On the other hand, the old object may become orphan if it
 596          * is still valid. Since it was referenced by an invalid entry,
 597          * making it as invisible temporary may be not worse. OI scrub
 598          * will process it later. */
 599         rc = ldiskfs_journal_get_write_access(th, bh);
 600         if (rc != 0)
 601                 GOTO(out, rc);
 602
 603         de->inode = cpu_to_le32(id->oii_ino);
 604         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 605
 606         GOTO(out, rc);
 607
 608 out:
 609         brelse(bh);
 610         mutex_unlock(&parent->i_mutex);
 611         return rc;
 612 }
 613
 614 static int osd_obj_del_entry(struct osd_thread_info *info,
 615                              struct osd_device *osd,
 616                              struct dentry *dird, char *name,
 617                              handle_t *th)
 618 {
 619         struct ldiskfs_dir_entry_2 *de;
 620         struct buffer_head         *bh;
 621         struct dentry              *child;
 622         struct inode               *dir = dird->d_inode;
 623         int                         rc;
 624         ENTRY;
 625
 626         LASSERT(th != NULL);
 627         LASSERT(th->h_transaction != NULL);
 628
 629
 630         child = &info->oti_child_dentry;
 631         child->d_name.hash = 0;
 632         child->d_name.name = name;
 633         child->d_name.len = strlen(name);
 634         child->d_parent = dird;
 635         child->d_inode = NULL;
 636
 637         ll_vfs_dq_init(dir);
 638         mutex_lock(&dir->i_mutex);
 639         rc = -ENOENT;
 640         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 641         if (bh) {
 642                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 643                 brelse(bh);
 644         }
 645         mutex_unlock(&dir->i_mutex);
 646
 647         RETURN(rc);
 648 }
 649
 650 static int osd_obj_add_entry(struct osd_thread_info *info,
 651                              struct osd_device *osd,
 652                              struct dentry *dir, char *name,
 653                              const struct osd_inode_id *id,
 654                              handle_t *th)
 655 {
 656         struct dentry *child;
 657         struct inode *inode;
 658         int rc;
 659
 660         ENTRY;
 661
 662         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 663                 RETURN(0);
 664
 665         LASSERT(th != NULL);
 666         LASSERT(th->h_transaction != NULL);
 667
 668         inode = info->oti_inode;
 669         if (unlikely(inode == NULL)) {
 670                 OBD_ALLOC_PTR(inode);
 671                 if (inode == NULL)
 672                         RETURN(-ENOMEM);
 673                 info->oti_inode = inode;
 674         }
 675
 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, u64 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, u64 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         osd_seq->oos_root = seq_dir;
 752
 753         /* 'What the @fid is' is not imporatant, because the object
 754          * has no OI mapping, and only is visible inside the OSD.*/
 755         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 756         rc = osd_ea_fid_set(info, inode, fid,
 757                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 758         if (rc != 0)
 759                 GOTO(out_put, rc);
 760
 761         LASSERT(osd_seq->oos_dirs == NULL);
 762         OBD_ALLOC(osd_seq->oos_dirs,
 763                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 764         if (osd_seq->oos_dirs == NULL)
 765                 GOTO(out_put, rc = -ENOMEM);
 766
 767         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 768                 struct dentry   *dir;
 769
 770                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 771                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 772                                    0700, 1);
 773                 if (IS_ERR(dir)) {
 774                         GOTO(out_free, rc = PTR_ERR(dir));
 775                 } else if (dir->d_inode == NULL) {
 776                         dput(dir);
 777                         GOTO(out_free, rc = -EFAULT);
 778                 }
 779
 780                 inode = dir->d_inode;
 781                 osd_seq->oos_dirs[i] = dir;
 782
 783                 /* 'What the @fid is' is not imporatant, because the object
 784                  * has no OI mapping, and only is visible inside the OSD.*/
 785                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 786                 rc = osd_ea_fid_set(info, inode, fid,
 787                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 788                 if (rc != 0)
 789                         GOTO(out_free, rc);
 790         }
 791
 792         if (rc != 0) {
 793 out_free:
 794                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 795                         if (osd_seq->oos_dirs[i] != NULL)
 796                                 dput(osd_seq->oos_dirs[i]);
 797                 }
 798                 OBD_FREE(osd_seq->oos_dirs,
 799                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 800 out_put:
 801                 dput(seq_dir);
 802                 osd_seq->oos_root = NULL;
 803         }
 804 out_err:
 805         RETURN(rc);
 806 }
 807
 808 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 809                                         struct osd_device *osd, u64 seq)
 810 {
 811         struct osd_obj_map      *map;
 812         struct osd_obj_seq      *osd_seq;
 813         int                     rc = 0;
 814         ENTRY;
 815
 816         map = osd->od_ost_map;
 817         LASSERT(map);
 818         LASSERT(map->om_root);
 819
 820         osd_seq = osd_seq_find(map, seq);
 821         if (likely(osd_seq != NULL))
 822                 RETURN(osd_seq);
 823
 824         /* Serializing init process */
 825         mutex_lock(&map->om_dir_init_mutex);
 826
 827         /* Check whether the seq has been added */
 828         read_lock(&map->om_seq_list_lock);
 829         osd_seq = osd_seq_find_locked(map, seq);
 830         if (osd_seq != NULL) {
 831                 read_unlock(&map->om_seq_list_lock);
 832                 GOTO(cleanup, rc = 0);
 833         }
 834         read_unlock(&map->om_seq_list_lock);
 835
 836         OBD_ALLOC_PTR(osd_seq);
 837         if (osd_seq == NULL)
 838                 GOTO(cleanup, rc = -ENOMEM);
 839
 840         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 841         osd_seq->oos_seq = seq;
 842         /* Init subdir count to be 32, but each seq can have
 843          * different subdir count */
 844         osd_seq->oos_subdir_count = map->om_subdir_count;
 845         rc = osd_seq_load_locked(info, osd, osd_seq);
 846         if (rc != 0)
 847                 GOTO(cleanup, rc);
 848
 849         write_lock(&map->om_seq_list_lock);
 850         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 851         write_unlock(&map->om_seq_list_lock);
 852
 853 cleanup:
 854         mutex_unlock(&map->om_dir_init_mutex);
 855         if (rc != 0) {
 856                 if (osd_seq != NULL)
 857                         OBD_FREE_PTR(osd_seq);
 858                 RETURN(ERR_PTR(rc));
 859         }
 860
 861         RETURN(osd_seq);
 862 }
 863
 864 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 865                        const struct lu_fid *fid, struct osd_inode_id *id)
 866 {
 867         struct osd_obj_map              *map;
 868         struct osd_obj_seq              *osd_seq;
 869         struct dentry                   *d_seq;
 870         struct dentry                   *child;
 871         struct ost_id                   *ostid = &info->oti_ostid;
 872         int                             dirn;
 873         char                            name[32];
 874         struct ldiskfs_dir_entry_2      *de;
 875         struct buffer_head              *bh;
 876         struct inode                    *dir;
 877         struct inode                    *inode;
 878         ENTRY;
 879
 880         /* on the very first lookup we find and open directories */
 881
 882         map = dev->od_ost_map;
 883         LASSERT(map);
 884         LASSERT(map->om_root);
 885
 886         fid_to_ostid(fid, ostid);
 887         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 888         if (IS_ERR(osd_seq))
 889                 RETURN(PTR_ERR(osd_seq));
 890
 891         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 892         d_seq = osd_seq->oos_dirs[dirn];
 893         LASSERT(d_seq);
 894
 895         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 896
 897         child = &info->oti_child_dentry;
 898         child->d_parent = d_seq;
 899         child->d_name.hash = 0;
 900         child->d_name.name = name;
 901         /* XXX: we can use rc from sprintf() instead of strlen() */
 902         child->d_name.len = strlen(name);
 903
 904         dir = d_seq->d_inode;
 905         mutex_lock(&dir->i_mutex);
 906         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 907         mutex_unlock(&dir->i_mutex);
 908
 909         if (bh == NULL)
 910                 RETURN(-ENOENT);
 911
 912         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 913         brelse(bh);
 914
 915         inode = osd_iget(info, dev, id);
 916         if (IS_ERR(inode)) {
 917                 int rc = PTR_ERR(inode);
 918
 919                 RETURN(rc == -ENOENT ? -ESTALE : rc);
 920         }
 921
 922         iput(inode);
 923         RETURN(0);
 924 }
 925
 926 int osd_obj_map_insert(struct osd_thread_info *info,
 927                        struct osd_device *osd,
 928                        const struct lu_fid *fid,
 929                        const struct osd_inode_id *id,
 930                        handle_t *th)
 931 {
 932         struct osd_obj_map      *map;
 933         struct osd_obj_seq      *osd_seq;
 934         struct dentry           *d;
 935         struct ost_id           *ostid = &info->oti_ostid;
 936         u64                      oid;
 937         int                     dirn, rc = 0;
 938         char                    name[32];
 939         ENTRY;
 940
 941         map = osd->od_ost_map;
 942         LASSERT(map);
 943
 944         /* map fid to seq:objid */
 945         fid_to_ostid(fid, ostid);
 946
 947         oid = ostid_id(ostid);
 948         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 949         if (IS_ERR(osd_seq))
 950                 RETURN(PTR_ERR(osd_seq));
 951
 952         dirn = oid & (osd_seq->oos_subdir_count - 1);
 953         d = osd_seq->oos_dirs[dirn];
 954         LASSERT(d);
 955
 956         osd_oid_name(name, sizeof(name), fid, oid);
 957
 958 again:
 959         rc = osd_obj_add_entry(info, osd, d, name, id, th);
 960         if (rc == -EEXIST) {
 961                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
 962                 if (unlikely(rc == -ENOENT))
 963                         goto again;
 964
 965                 if (unlikely(rc == 1))
 966                         RETURN(0);
 967         }
 968
 969         RETURN(rc);
 970 }
 971
 972 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
 973                        const struct lu_fid *fid, handle_t *th)
 974 {
 975         struct osd_obj_map      *map;
 976         struct osd_obj_seq      *osd_seq;
 977         struct dentry           *d;
 978         struct ost_id           *ostid = &info->oti_ostid;
 979         int                     dirn, rc = 0;
 980         char                    name[32];
 981         ENTRY;
 982
 983         map = osd->od_ost_map;
 984         LASSERT(map);
 985
 986         /* map fid to seq:objid */
 987         fid_to_ostid(fid, ostid);
 988
 989         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 990         if (IS_ERR(osd_seq))
 991                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
 992
 993         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 994         d = osd_seq->oos_dirs[dirn];
 995         LASSERT(d);
 996
 997         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 998         rc = osd_obj_del_entry(info, osd, d, name, th);
 999 cleanup:
1000         RETURN(rc);
1001 }
1002
1003 int osd_obj_map_update(struct osd_thread_info *info,
1004                        struct osd_device *osd,
1005                        const struct lu_fid *fid,
1006                        const struct osd_inode_id *id,
1007                        handle_t *th)
1008 {
1009         struct osd_obj_seq      *osd_seq;
1010         struct dentry           *d;
1011         struct ost_id           *ostid = &info->oti_ostid;
1012         int                     dirn, rc = 0;
1013         char                    name[32];
1014         ENTRY;
1015
1016         fid_to_ostid(fid, ostid);
1017         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1018         if (IS_ERR(osd_seq))
1019                 RETURN(PTR_ERR(osd_seq));
1020
1021         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1022         d = osd_seq->oos_dirs[dirn];
1023         LASSERT(d);
1024
1025         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1026         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1027
1028         RETURN(rc);
1029 }
1030
1031 int osd_obj_map_recover(struct osd_thread_info *info,
1032                         struct osd_device *osd,
1033                         struct inode *src_parent,
1034                         struct dentry *src_child,
1035                         const struct lu_fid *fid)
1036 {
1037         struct osd_obj_seq         *osd_seq;
1038         struct dentry              *tgt_parent;
1039         struct dentry              *tgt_child = &info->oti_child_dentry;
1040         struct inode               *dir;
1041         struct inode               *inode     = src_child->d_inode;
1042         struct ost_id              *ostid     = &info->oti_ostid;
1043         handle_t                   *jh;
1044         struct ldiskfs_dir_entry_2 *de;
1045         struct buffer_head         *bh;
1046         char                        name[32];
1047         int                         dirn;
1048         int                         rc        = 0;
1049         ENTRY;
1050
1051         if (fid_is_last_id(fid)) {
1052                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1053                 if (IS_ERR(osd_seq))
1054                         RETURN(PTR_ERR(osd_seq));
1055
1056                 tgt_parent = osd_seq->oos_root;
1057                 tgt_child->d_name.name = "LAST_ID";
1058                 tgt_child->d_name.len = strlen("LAST_ID");
1059         } else {
1060                 fid_to_ostid(fid, ostid);
1061                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1062                 if (IS_ERR(osd_seq))
1063                         RETURN(PTR_ERR(osd_seq));
1064
1065                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1066                 tgt_parent = osd_seq->oos_dirs[dirn];
1067                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1068                 tgt_child->d_name.name = name;
1069                 tgt_child->d_name.len = strlen(name);
1070         }
1071         LASSERT(tgt_parent != NULL);
1072
1073         dir = tgt_parent->d_inode;
1074         tgt_child->d_name.hash = 0;
1075         tgt_child->d_parent = tgt_parent;
1076         tgt_child->d_inode = inode;
1077
1078         /* The non-initialized src_child may be destroyed. */
1079         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1080                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1081                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1082                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1083         if (IS_ERR(jh))
1084                 RETURN(PTR_ERR(jh));
1085
1086         ll_vfs_dq_init(src_parent);
1087         ll_vfs_dq_init(dir);
1088
1089         mutex_lock(&src_parent->i_mutex);
1090         mutex_lock(&dir->i_mutex);
1091         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1092         if (bh != NULL) {
1093                 /* XXX: If some other object occupied the same slot. And If such
1094                  *      inode is zero-sized and with SUID+SGID, then means it is
1095                  *      a new created one. Maybe we can remove it and insert the
1096                  *      original one back to the /O/<seq>/d<x>. But there are
1097                  *      something to be considered:
1098                  *
1099                  *      1) The OST-object under /lost+found has crashed LMA.
1100                  *         So it should not conflict with the current one.
1101                  *
1102                  *      2) There are race conditions that: someone may just want
1103                  *         to modify the current one. Even if the OI scrub takes
1104                  *         the object lock when remove the current one, it still
1105                  *         cause the modification to be lost becasue the target
1106                  *         has been removed when the RPC service thread waiting
1107                  *         for the lock.
1108                  *
1109                  *      So keep it there before we have suitable solution. */
1110                 brelse(bh);
1111                 mutex_unlock(&dir->i_mutex);
1112                 mutex_unlock(&src_parent->i_mutex);
1113                 ldiskfs_journal_stop(jh);
1114
1115                 rc = -EEXIST;
1116                 /* If the src object has never been modified, then remove it. */
1117                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1118                     inode->i_mode & S_ISGID) {
1119                         rc = ll_vfs_unlink(src_parent, src_child);
1120                         if (unlikely(rc == -ENOENT))
1121                                 rc = 0;
1122                 }
1123                 RETURN(rc);
1124         }
1125
1126         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1127                                     NULL, NULL);
1128         if (unlikely(bh == NULL))
1129                 GOTO(unlock, rc = -ENOENT);
1130
1131         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1132         brelse(bh);
1133         if (rc != 0)
1134                 GOTO(unlock, rc);
1135
1136         rc = osd_ldiskfs_add_entry(jh, tgt_child, inode, NULL);
1137
1138         GOTO(unlock, rc);
1139
1140 unlock:
1141         mutex_unlock(&dir->i_mutex);
1142         mutex_unlock(&src_parent->i_mutex);
1143         ldiskfs_journal_stop(jh);
1144         return rc;
1145 }
1146
1147 static struct dentry *
1148 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1149                      const struct lu_fid *fid, char **name)
1150 {
1151         struct dentry *root = ERR_PTR(-ENOENT);
1152
1153         if (fid_is_last_id(fid)) {
1154                 struct osd_obj_seq *osd_seq;
1155
1156                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1157                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1158                 if (IS_ERR(osd_seq))
1159                         RETURN((struct dentry *)osd_seq);
1160
1161                 *name = "LAST_ID";
1162                 root = osd_seq->oos_root;
1163         } else {
1164                 *name = osd_lf_fid2name(fid);
1165                 if (*name == NULL)
1166                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1167                 else if ((*name)[0])
1168                         root = osd_sb(osd)->s_root;
1169         }
1170
1171         return root;
1172 }
1173
1174 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1175                         const struct lu_fid *fid, const struct osd_inode_id *id,
1176                         handle_t *th)
1177 {
1178         struct dentry   *root;
1179         char            *name = NULL;
1180         int              rc;
1181         ENTRY;
1182
1183         root = osd_object_spec_find(info, osd, fid, &name);
1184         if (!IS_ERR(root)) {
1185                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1186         } else {
1187                 rc = PTR_ERR(root);
1188                 if (rc == -ENOENT)
1189                         rc = 1;
1190         }
1191
1192         RETURN(rc);
1193 }
1194
1195 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1196                         const struct lu_fid *fid, const struct osd_inode_id *id,
1197                         handle_t *th)
1198 {
1199         struct dentry   *root;
1200         char            *name = NULL;
1201         int              rc;
1202         ENTRY;
1203
1204         root = osd_object_spec_find(info, osd, fid, &name);
1205         if (!IS_ERR(root)) {
1206                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1207         } else {
1208                 rc = PTR_ERR(root);
1209                 if (rc == -ENOENT)
1210                         rc = 0;
1211         }
1212
1213         RETURN(rc);
1214 }
1215
1216 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1217                         const struct lu_fid *fid, struct osd_inode_id *id)
1218 {
1219         struct dentry   *root;
1220         struct dentry   *dentry;
1221         struct inode    *inode;
1222         char            *name = NULL;
1223         int             rc = -ENOENT;
1224         ENTRY;
1225
1226         if (fid_is_last_id(fid)) {
1227                 struct osd_obj_seq *osd_seq;
1228
1229                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1230                 if (IS_ERR(osd_seq))
1231                         RETURN(PTR_ERR(osd_seq));
1232                 root = osd_seq->oos_root;
1233                 name = "LAST_ID";
1234         } else {
1235                 root = osd_sb(osd)->s_root;
1236                 name = osd_lf_fid2name(fid);
1237                 if (name == NULL || strlen(name) == 0)
1238                         RETURN(-ENOENT);
1239         }
1240
1241         dentry = ll_lookup_one_len(name, root, strlen(name));
1242         if (!IS_ERR(dentry)) {
1243                 inode = dentry->d_inode;
1244                 if (inode) {
1245                         if (is_bad_inode(inode)) {
1246                                 rc = -EIO;
1247                         } else {
1248                                 osd_id_gen(id, inode->i_ino,
1249                                            inode->i_generation);
1250                                 rc = 0;
1251                         }
1252                 }
1253                 /* if dentry is accessible after osd_compat_spec_insert it
1254                  * will still contain NULL inode, so don't keep it in cache */
1255                 d_invalidate(dentry);
1256                 dput(dentry);
1257         }
1258
1259         RETURN(rc);
1260 }