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         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 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                 OBD_FREE_PTR(dev->od_ost_map);
 374                 RETURN(rc);
 375         }
 376
 377         dev->od_ost_map->om_subdir_count = rc;
 378         rc = 0;
 379
 380         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 381         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 382         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 383
 384         osd_push_ctxt(dev, &new, &save);
 385
 386         d = ll_lookup_one_len("O", rootd, strlen("O"));
 387         if (IS_ERR(d))
 388                 GOTO(cleanup, rc = PTR_ERR(d));
 389         if (d->d_inode == NULL) {
 390                 dput(d);
 391                 /* The lookup() may be called again inside simple_mkdir().
 392                  * Since the repeated lookup() only be called for "/O" at
 393                  * mount time, it will not affect the whole performance. */
 394                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
 395                 if (IS_ERR(d))
 396                         GOTO(cleanup, rc = PTR_ERR(d));
 397
 398                 /* It is quite probably that the device is new formatted. */
 399                 dev->od_maybe_new = 1;
 400         }
 401
 402         inode = d->d_inode;
 403         dev->od_ost_map->om_root = d;
 404
 405         /* 'What the @fid is' is not imporatant, because the object
 406          * has no OI mapping, and only is visible inside the OSD.*/
 407         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 408         rc = osd_ea_fid_set(info, inode, fid,
 409                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 410
 411         GOTO(cleanup, rc);
 412
 413 cleanup:
 414         pop_ctxt(&save, &new);
 415         if (IS_ERR(d)) {
 416                 OBD_FREE_PTR(dev->od_ost_map);
 417                 RETURN(PTR_ERR(d));
 418         }
 419         return rc;
 420 }
 421
 422 static void osd_seq_free(struct osd_obj_map *map,
 423                          struct osd_obj_seq *osd_seq)
 424 {
 425         int j;
 426
 427         list_del_init(&osd_seq->oos_seq_list);
 428
 429         if (osd_seq->oos_dirs) {
 430                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 431                         if (osd_seq->oos_dirs[j])
 432                                 dput(osd_seq->oos_dirs[j]);
 433                 }
 434                 OBD_FREE(osd_seq->oos_dirs,
 435                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 436         }
 437
 438         if (osd_seq->oos_root)
 439                 dput(osd_seq->oos_root);
 440
 441         OBD_FREE_PTR(osd_seq);
 442 }
 443
 444 static void osd_ost_fini(struct osd_device *osd)
 445 {
 446         struct osd_obj_seq    *osd_seq;
 447         struct osd_obj_seq    *tmp;
 448         struct osd_obj_map    *map = osd->od_ost_map;
 449         ENTRY;
 450
 451         if (map == NULL)
 452                 return;
 453
 454         write_lock(&map->om_seq_list_lock);
 455         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 456                                  oos_seq_list) {
 457                 osd_seq_free(map, osd_seq);
 458         }
 459         write_unlock(&map->om_seq_list_lock);
 460         if (map->om_root)
 461                 dput(map->om_root);
 462         OBD_FREE_PTR(map);
 463         osd->od_ost_map = NULL;
 464         EXIT;
 465 }
 466
 467 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 468 {
 469         int rc;
 470         ENTRY;
 471
 472         /* prepare structures for OST */
 473         rc = osd_ost_init(env, dev);
 474         if (rc)
 475                 RETURN(rc);
 476
 477         /* prepare structures for MDS */
 478         rc = osd_mdt_init(env, dev);
 479
 480         RETURN(rc);
 481 }
 482
 483 struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, obd_seq seq)
 484 {
 485         struct osd_obj_seq *osd_seq;
 486
 487         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 488                 if (osd_seq->oos_seq == seq)
 489                         return osd_seq;
 490         }
 491         return NULL;
 492 }
 493
 494 struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, obd_seq seq)
 495 {
 496         struct osd_obj_seq *osd_seq;
 497
 498         read_lock(&map->om_seq_list_lock);
 499         osd_seq = osd_seq_find_locked(map, seq);
 500         read_unlock(&map->om_seq_list_lock);
 501         return osd_seq;
 502 }
 503
 504 void osd_obj_map_fini(struct osd_device *dev)
 505 {
 506         osd_ost_fini(dev);
 507         osd_mdt_fini(dev);
 508 }
 509
 510 /**
 511  * Update the specified OI mapping.
 512  *
 513  * \retval   1, changed nothing
 514  * \retval   0, changed successfully
 515  * \retval -ve, on error
 516  */
 517 static int osd_obj_update_entry(struct osd_thread_info *info,
 518                                 struct osd_device *osd,
 519                                 struct dentry *dir, const char *name,
 520                                 const struct lu_fid *fid,
 521                                 const struct osd_inode_id *id,
 522                                 handle_t *th)
 523 {
 524         struct inode               *parent = dir->d_inode;
 525         struct dentry              *child;
 526         struct ldiskfs_dir_entry_2 *de;
 527         struct buffer_head         *bh;
 528         struct inode               *inode;
 529         struct dentry              *dentry = &info->oti_obj_dentry;
 530         struct osd_inode_id        *oi_id  = &info->oti_id3;
 531         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 532         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 533         int                         rc;
 534         ENTRY;
 535
 536         LASSERT(th != NULL);
 537         LASSERT(th->h_transaction != NULL);
 538
 539         child = &info->oti_child_dentry;
 540         child->d_parent = dir;
 541         child->d_name.hash = 0;
 542         child->d_name.name = name;
 543         child->d_name.len = strlen(name);
 544
 545         ll_vfs_dq_init(parent);
 546         mutex_lock(&parent->i_mutex);
 547         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 548         if (bh == NULL)
 549                 GOTO(out, rc = -ENOENT);
 550
 551         if (le32_to_cpu(de->inode) == id->oii_ino)
 552                 GOTO(out, rc = 1);
 553
 554         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 555         inode = osd_iget(info, osd, oi_id);
 556         if (IS_ERR(inode)) {
 557                 rc = PTR_ERR(inode);
 558                 if (rc == -ENOENT || rc == -ESTALE)
 559                         goto update;
 560                 GOTO(out, rc);
 561         }
 562
 563         rc = osd_get_lma(info, inode, dentry, lma);
 564         if (rc == -ENODATA) {
 565                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 566                 if (rc > 0) {
 567                         oi_fid = NULL;
 568                         rc = 0;
 569                 }
 570         }
 571         iput(inode);
 572
 573         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 574          * either a crashed object or a uninitialized one. Replace it. */
 575         if (rc == -ENODATA || oi_fid == NULL)
 576                 goto update;
 577
 578         if (rc != 0)
 579                 GOTO(out, rc);
 580
 581         if (lu_fid_eq(fid, oi_fid)) {
 582                 CERROR("%s: the FID "DFID" is used by two objects: "
 583                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 584                        oi_id->oii_ino, oi_id->oii_gen,
 585                        id->oii_ino, id->oii_gen);
 586                 GOTO(out, rc = -EEXIST);
 587         }
 588
 589 update:
 590         /* There may be temporary inconsistency: On one hand, the new
 591          * object may be referenced by multiple entries, which is out
 592          * of our control unless we traverse the whole /O completely,
 593          * which is non-flat order and inefficient, should be avoided;
 594          * On the other hand, the old object may become orphan if it
 595          * is still valid. Since it was referenced by an invalid entry,
 596          * making it as invisible temporary may be not worse. OI scrub
 597          * will process it later. */
 598         rc = ldiskfs_journal_get_write_access(th, bh);
 599         if (rc != 0)
 600                 GOTO(out, rc);
 601
 602         de->inode = cpu_to_le32(id->oii_ino);
 603         rc = ldiskfs_journal_dirty_metadata(th, bh);
 604
 605         GOTO(out, rc);
 606
 607 out:
 608         brelse(bh);
 609         mutex_unlock(&parent->i_mutex);
 610         return rc;
 611 }
 612
 613 static int osd_obj_del_entry(struct osd_thread_info *info,
 614                              struct osd_device *osd,
 615                              struct dentry *dird, char *name,
 616                              handle_t *th)
 617 {
 618         struct ldiskfs_dir_entry_2 *de;
 619         struct buffer_head         *bh;
 620         struct dentry              *child;
 621         struct inode               *dir = dird->d_inode;
 622         int                         rc;
 623         ENTRY;
 624
 625         LASSERT(th != NULL);
 626         LASSERT(th->h_transaction != NULL);
 627
 628
 629         child = &info->oti_child_dentry;
 630         child->d_name.hash = 0;
 631         child->d_name.name = name;
 632         child->d_name.len = strlen(name);
 633         child->d_parent = dird;
 634         child->d_inode = NULL;
 635
 636         ll_vfs_dq_init(dir);
 637         mutex_lock(&dir->i_mutex);
 638         rc = -ENOENT;
 639         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 640         if (bh) {
 641                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 642                 brelse(bh);
 643         }
 644         mutex_unlock(&dir->i_mutex);
 645
 646         RETURN(rc);
 647 }
 648
 649 int osd_obj_add_entry(struct osd_thread_info *info,
 650                       struct osd_device *osd,
 651                       struct dentry *dir, char *name,
 652                       const struct osd_inode_id *id,
 653                       handle_t *th)
 654 {
 655         struct dentry *child;
 656         struct inode *inode;
 657         int rc;
 658
 659         ENTRY;
 660
 661         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 662                 RETURN(0);
 663
 664         LASSERT(th != NULL);
 665         LASSERT(th->h_transaction != NULL);
 666
 667         inode = &info->oti_inode;
 668         inode->i_sb = osd_sb(osd);
 669         osd_id_to_inode(inode, id);
 670         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 671
 672         child = &info->oti_child_dentry;
 673         child->d_name.hash = 0;
 674         child->d_name.name = name;
 675         child->d_name.len = strlen(name);
 676         child->d_parent = dir;
 677         child->d_inode = inode;
 678
 679         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 680                 inode->i_ino++;
 681
 682         ll_vfs_dq_init(dir->d_inode);
 683         mutex_lock(&dir->d_inode->i_mutex);
 684         rc = osd_ldiskfs_add_entry(th, child, inode, NULL);
 685         mutex_unlock(&dir->d_inode->i_mutex);
 686
 687         RETURN(rc);
 688 }
 689
 690 /**
 691  * Use LPU64 for legacy OST sequences, but use LPX64i for new
 692  * sequences names, so that the O/{seq}/dN/{oid} more closely
 693  * follows the DFID/PFID format. This makes it easier to map from
 694  * debug messages to objects in the future, and the legacy space
 695  * of FID_SEQ_OST_MDT0 will be unused in the future.
 696  **/
 697 static inline void osd_seq_name(char *seq_name, size_t name_size, obd_seq seq)
 698 {
 699         snprintf(seq_name, name_size,
 700                  (fid_seq_is_rsvd(seq) ||
 701                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
 702                  fid_seq_is_idif(seq) ? 0 : seq);
 703 }
 704
 705 static inline void osd_oid_name(char *name, size_t name_size,
 706                                 const struct lu_fid *fid, obd_id id)
 707 {
 708         snprintf(name, name_size,
 709                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 710                   fid_seq_is_mdt0(fid_seq(fid)) ||
 711                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 712 }
 713
 714 /* external locking is required */
 715 static int osd_seq_load_locked(struct osd_thread_info *info,
 716                                struct osd_device *osd,
 717                                struct osd_obj_seq *osd_seq)
 718 {
 719         struct osd_obj_map  *map = osd->od_ost_map;
 720         struct dentry       *seq_dir;
 721         struct inode        *inode;
 722         struct lu_fid       *fid = &info->oti_fid3;
 723         int                 rc = 0;
 724         int                 i;
 725         char                dir_name[32];
 726         ENTRY;
 727
 728         if (osd_seq->oos_root != NULL)
 729                 RETURN(0);
 730
 731         LASSERT(map);
 732         LASSERT(map->om_root);
 733
 734         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 735
 736         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 737         if (IS_ERR(seq_dir))
 738                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 739         else if (seq_dir->d_inode == NULL)
 740                 GOTO(out_put, rc = -EFAULT);
 741
 742         inode = seq_dir->d_inode;
 743         osd_seq->oos_root = seq_dir;
 744
 745         /* 'What the @fid is' is not imporatant, because the object
 746          * has no OI mapping, and only is visible inside the OSD.*/
 747         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 748         rc = osd_ea_fid_set(info, inode, fid,
 749                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 750         if (rc != 0)
 751                 GOTO(out_put, rc);
 752
 753         LASSERT(osd_seq->oos_dirs == NULL);
 754         OBD_ALLOC(osd_seq->oos_dirs,
 755                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 756         if (osd_seq->oos_dirs == NULL)
 757                 GOTO(out_put, rc = -ENOMEM);
 758
 759         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 760                 struct dentry   *dir;
 761
 762                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 763                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 764                                    0700, 1);
 765                 if (IS_ERR(dir)) {
 766                         GOTO(out_free, rc = PTR_ERR(dir));
 767                 } else if (dir->d_inode == NULL) {
 768                         dput(dir);
 769                         GOTO(out_free, rc = -EFAULT);
 770                 }
 771
 772                 inode = dir->d_inode;
 773                 osd_seq->oos_dirs[i] = dir;
 774
 775                 /* 'What the @fid is' is not imporatant, because the object
 776                  * has no OI mapping, and only is visible inside the OSD.*/
 777                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 778                 rc = osd_ea_fid_set(info, inode, fid,
 779                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 780                 if (rc != 0)
 781                         GOTO(out_free, rc);
 782         }
 783
 784         if (rc != 0) {
 785 out_free:
 786                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 787                         if (osd_seq->oos_dirs[i] != NULL)
 788                                 dput(osd_seq->oos_dirs[i]);
 789                 }
 790                 OBD_FREE(osd_seq->oos_dirs,
 791                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 792 out_put:
 793                 dput(seq_dir);
 794                 osd_seq->oos_root = NULL;
 795         }
 796 out_err:
 797         RETURN(rc);
 798 }
 799
 800 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 801                                         struct osd_device *osd, obd_seq seq)
 802 {
 803         struct osd_obj_map      *map;
 804         struct osd_obj_seq      *osd_seq;
 805         int                     rc = 0;
 806         ENTRY;
 807
 808         map = osd->od_ost_map;
 809         LASSERT(map);
 810         LASSERT(map->om_root);
 811
 812         osd_seq = osd_seq_find(map, seq);
 813         if (likely(osd_seq != NULL))
 814                 RETURN(osd_seq);
 815
 816         /* Serializing init process */
 817         mutex_lock(&map->om_dir_init_mutex);
 818
 819         /* Check whether the seq has been added */
 820         read_lock(&map->om_seq_list_lock);
 821         osd_seq = osd_seq_find_locked(map, seq);
 822         if (osd_seq != NULL) {
 823                 read_unlock(&map->om_seq_list_lock);
 824                 GOTO(cleanup, rc = 0);
 825         }
 826         read_unlock(&map->om_seq_list_lock);
 827
 828         OBD_ALLOC_PTR(osd_seq);
 829         if (osd_seq == NULL)
 830                 GOTO(cleanup, rc = -ENOMEM);
 831
 832         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 833         osd_seq->oos_seq = seq;
 834         /* Init subdir count to be 32, but each seq can have
 835          * different subdir count */
 836         osd_seq->oos_subdir_count = map->om_subdir_count;
 837         rc = osd_seq_load_locked(info, osd, osd_seq);
 838         if (rc != 0)
 839                 GOTO(cleanup, rc);
 840
 841         write_lock(&map->om_seq_list_lock);
 842         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 843         write_unlock(&map->om_seq_list_lock);
 844
 845 cleanup:
 846         mutex_unlock(&map->om_dir_init_mutex);
 847         if (rc != 0) {
 848                 if (osd_seq != NULL)
 849                         OBD_FREE_PTR(osd_seq);
 850                 RETURN(ERR_PTR(rc));
 851         }
 852
 853         RETURN(osd_seq);
 854 }
 855
 856 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 857                        const struct lu_fid *fid, struct osd_inode_id *id)
 858 {
 859         struct osd_obj_map              *map;
 860         struct osd_obj_seq              *osd_seq;
 861         struct dentry                   *d_seq;
 862         struct dentry                   *child;
 863         struct ost_id                   *ostid = &info->oti_ostid;
 864         int                             dirn;
 865         char                            name[32];
 866         struct ldiskfs_dir_entry_2      *de;
 867         struct buffer_head              *bh;
 868         struct inode                    *dir;
 869         struct inode                    *inode;
 870         ENTRY;
 871
 872         /* on the very first lookup we find and open directories */
 873
 874         map = dev->od_ost_map;
 875         LASSERT(map);
 876         LASSERT(map->om_root);
 877
 878         fid_to_ostid(fid, ostid);
 879         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 880         if (IS_ERR(osd_seq))
 881                 RETURN(PTR_ERR(osd_seq));
 882
 883         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 884         d_seq = osd_seq->oos_dirs[dirn];
 885         LASSERT(d_seq);
 886
 887         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 888
 889         child = &info->oti_child_dentry;
 890         child->d_parent = d_seq;
 891         child->d_name.hash = 0;
 892         child->d_name.name = name;
 893         /* XXX: we can use rc from sprintf() instead of strlen() */
 894         child->d_name.len = strlen(name);
 895
 896         dir = d_seq->d_inode;
 897         mutex_lock(&dir->i_mutex);
 898         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 899         mutex_unlock(&dir->i_mutex);
 900
 901         if (bh == NULL)
 902                 RETURN(-ENOENT);
 903
 904         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 905         brelse(bh);
 906
 907         inode = osd_iget(info, dev, id);
 908         if (IS_ERR(inode))
 909                 RETURN(PTR_ERR(inode));
 910
 911         iput(inode);
 912         RETURN(0);
 913 }
 914
 915 int osd_obj_map_insert(struct osd_thread_info *info,
 916                        struct osd_device *osd,
 917                        const struct lu_fid *fid,
 918                        const struct osd_inode_id *id,
 919                        handle_t *th)
 920 {
 921         struct osd_obj_map      *map;
 922         struct osd_obj_seq      *osd_seq;
 923         struct dentry           *d;
 924         struct ost_id           *ostid = &info->oti_ostid;
 925         obd_id                   oid;
 926         int                     dirn, rc = 0;
 927         char                    name[32];
 928         ENTRY;
 929
 930         map = osd->od_ost_map;
 931         LASSERT(map);
 932
 933         /* map fid to seq:objid */
 934         fid_to_ostid(fid, ostid);
 935
 936         oid = ostid_id(ostid);
 937         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 938         if (IS_ERR(osd_seq))
 939                 RETURN(PTR_ERR(osd_seq));
 940
 941         dirn = oid & (osd_seq->oos_subdir_count - 1);
 942         d = osd_seq->oos_dirs[dirn];
 943         LASSERT(d);
 944
 945         osd_oid_name(name, sizeof(name), fid, oid);
 946
 947 again:
 948         rc = osd_obj_add_entry(info, osd, d, name, id, th);
 949         if (rc == -EEXIST) {
 950                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
 951                 if (unlikely(rc == -ENOENT))
 952                         goto again;
 953
 954                 if (unlikely(rc == 1))
 955                         RETURN(0);
 956         }
 957
 958         RETURN(rc);
 959 }
 960
 961 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
 962                        const struct lu_fid *fid, handle_t *th)
 963 {
 964         struct osd_obj_map      *map;
 965         struct osd_obj_seq      *osd_seq;
 966         struct dentry           *d;
 967         struct ost_id           *ostid = &info->oti_ostid;
 968         int                     dirn, rc = 0;
 969         char                    name[32];
 970         ENTRY;
 971
 972         map = osd->od_ost_map;
 973         LASSERT(map);
 974
 975         /* map fid to seq:objid */
 976         fid_to_ostid(fid, ostid);
 977
 978         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 979         if (IS_ERR(osd_seq))
 980                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
 981
 982         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 983         d = osd_seq->oos_dirs[dirn];
 984         LASSERT(d);
 985
 986         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 987         rc = osd_obj_del_entry(info, osd, d, name, th);
 988 cleanup:
 989         RETURN(rc);
 990 }
 991
 992 int osd_obj_map_update(struct osd_thread_info *info,
 993                        struct osd_device *osd,
 994                        const struct lu_fid *fid,
 995                        const struct osd_inode_id *id,
 996                        handle_t *th)
 997 {
 998         struct osd_obj_seq      *osd_seq;
 999         struct dentry           *d;
1000         struct ost_id           *ostid = &info->oti_ostid;
1001         int                     dirn, rc = 0;
1002         char                    name[32];
1003         ENTRY;
1004
1005         fid_to_ostid(fid, ostid);
1006         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1007         if (IS_ERR(osd_seq))
1008                 RETURN(PTR_ERR(osd_seq));
1009
1010         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1011         d = osd_seq->oos_dirs[dirn];
1012         LASSERT(d);
1013
1014         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1015         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1016
1017         RETURN(rc);
1018 }
1019
1020 int osd_obj_map_recover(struct osd_thread_info *info,
1021                         struct osd_device *osd,
1022                         struct inode *src_parent,
1023                         struct dentry *src_child,
1024                         const struct lu_fid *fid)
1025 {
1026         struct osd_obj_seq         *osd_seq;
1027         struct dentry              *tgt_parent;
1028         struct dentry              *tgt_child = &info->oti_child_dentry;
1029         struct inode               *dir;
1030         struct inode               *inode     = src_child->d_inode;
1031         struct ost_id              *ostid     = &info->oti_ostid;
1032         handle_t                   *jh;
1033         struct ldiskfs_dir_entry_2 *de;
1034         struct buffer_head         *bh;
1035         char                        name[32];
1036         int                         dirn;
1037         int                         rc        = 0;
1038         ENTRY;
1039
1040         if (fid_is_last_id(fid)) {
1041                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1042                 if (IS_ERR(osd_seq))
1043                         RETURN(PTR_ERR(osd_seq));
1044
1045                 tgt_parent = osd_seq->oos_root;
1046                 tgt_child->d_name.name = "LAST_ID";
1047                 tgt_child->d_name.len = strlen("LAST_ID");
1048         } else {
1049                 fid_to_ostid(fid, ostid);
1050                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1051                 if (IS_ERR(osd_seq))
1052                         RETURN(PTR_ERR(osd_seq));
1053
1054                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1055                 tgt_parent = osd_seq->oos_dirs[dirn];
1056                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1057                 tgt_child->d_name.name = name;
1058                 tgt_child->d_name.len = strlen(name);
1059         }
1060         LASSERT(tgt_parent != NULL);
1061
1062         dir = tgt_parent->d_inode;
1063         tgt_child->d_name.hash = 0;
1064         tgt_child->d_parent = tgt_parent;
1065         tgt_child->d_inode = inode;
1066
1067         /* The non-initialized src_child may be destroyed. */
1068         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1069                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1070                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1071                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1072         if (IS_ERR(jh))
1073                 RETURN(PTR_ERR(jh));
1074
1075         ll_vfs_dq_init(src_parent);
1076         ll_vfs_dq_init(dir);
1077
1078         mutex_lock(&src_parent->i_mutex);
1079         mutex_lock(&dir->i_mutex);
1080         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1081         if (bh != NULL) {
1082                 /* XXX: If some other object occupied the same slot. And If such
1083                  *      inode is zero-sized and with SUID+SGID, then means it is
1084                  *      a new created one. Maybe we can remove it and insert the
1085                  *      original one back to the /O/<seq>/d<x>. But there are
1086                  *      something to be considered:
1087                  *
1088                  *      1) The OST-object under /lost+found has crashed LMA.
1089                  *         So it should not conflict with the current one.
1090                  *
1091                  *      2) There are race conditions that: someone may just want
1092                  *         to modify the current one. Even if the OI scrub takes
1093                  *         the object lock when remove the current one, it still
1094                  *         cause the modification to be lost becasue the target
1095                  *         has been removed when the RPC service thread waiting
1096                  *         for the lock.
1097                  *
1098                  *      So keep it there before we have suitable solution. */
1099                 brelse(bh);
1100                 mutex_unlock(&dir->i_mutex);
1101                 mutex_unlock(&src_parent->i_mutex);
1102                 ldiskfs_journal_stop(jh);
1103
1104                 rc = -EEXIST;
1105                 /* If the src object has never been modified, then remove it. */
1106                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1107                     inode->i_mode & S_ISGID) {
1108                         rc = ll_vfs_unlink(src_parent, src_child);
1109                         if (unlikely(rc == -ENOENT))
1110                                 rc = 0;
1111                 }
1112                 RETURN(rc);
1113         }
1114
1115         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1116                                     NULL, NULL);
1117         if (unlikely(bh == NULL))
1118                 GOTO(unlock, rc = -ENOENT);
1119
1120         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1121         brelse(bh);
1122         if (rc != 0)
1123                 GOTO(unlock, rc);
1124
1125         rc = osd_ldiskfs_add_entry(jh, tgt_child, inode, NULL);
1126
1127         GOTO(unlock, rc);
1128
1129 unlock:
1130         mutex_unlock(&dir->i_mutex);
1131         mutex_unlock(&src_parent->i_mutex);
1132         ldiskfs_journal_stop(jh);
1133         return rc;
1134 }
1135
1136 static struct dentry *
1137 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1138                      const struct lu_fid *fid, char **name)
1139 {
1140         struct dentry *root = ERR_PTR(-ENOENT);
1141
1142         if (fid_is_last_id(fid)) {
1143                 struct osd_obj_seq *osd_seq;
1144
1145                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1146                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1147                 if (IS_ERR(osd_seq))
1148                         RETURN((struct dentry *)osd_seq);
1149
1150                 *name = "LAST_ID";
1151                 root = osd_seq->oos_root;
1152         } else {
1153                 *name = osd_lf_fid2name(fid);
1154                 if (*name == NULL)
1155                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1156                 else if ((*name)[0])
1157                         root = osd_sb(osd)->s_root;
1158         }
1159
1160         return root;
1161 }
1162
1163 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1164                         const struct lu_fid *fid, const struct osd_inode_id *id,
1165                         handle_t *th)
1166 {
1167         struct dentry   *root;
1168         char            *name = NULL;
1169         int              rc;
1170         ENTRY;
1171
1172         root = osd_object_spec_find(info, osd, fid, &name);
1173         if (!IS_ERR(root)) {
1174                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1175         } else {
1176                 rc = PTR_ERR(root);
1177                 if (rc == -ENOENT)
1178                         rc = 1;
1179         }
1180
1181         RETURN(rc);
1182 }
1183
1184 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1185                         const struct lu_fid *fid, const struct osd_inode_id *id,
1186                         handle_t *th)
1187 {
1188         struct dentry   *root;
1189         char            *name = NULL;
1190         int              rc;
1191         ENTRY;
1192
1193         root = osd_object_spec_find(info, osd, fid, &name);
1194         if (!IS_ERR(root)) {
1195                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1196         } else {
1197                 rc = PTR_ERR(root);
1198                 if (rc == -ENOENT)
1199                         rc = 0;
1200         }
1201
1202         RETURN(rc);
1203 }
1204
1205 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1206                         const struct lu_fid *fid, struct osd_inode_id *id)
1207 {
1208         struct dentry   *root;
1209         struct dentry   *dentry;
1210         struct inode    *inode;
1211         char            *name = NULL;
1212         int             rc = -ENOENT;
1213         ENTRY;
1214
1215         if (fid_is_last_id(fid)) {
1216                 struct osd_obj_seq *osd_seq;
1217
1218                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1219                 if (IS_ERR(osd_seq))
1220                         RETURN(PTR_ERR(osd_seq));
1221                 root = osd_seq->oos_root;
1222                 name = "LAST_ID";
1223         } else {
1224                 root = osd_sb(osd)->s_root;
1225                 name = osd_lf_fid2name(fid);
1226                 if (name == NULL || strlen(name) == 0)
1227                         RETURN(-ENOENT);
1228         }
1229
1230         dentry = ll_lookup_one_len(name, root, strlen(name));
1231         if (!IS_ERR(dentry)) {
1232                 inode = dentry->d_inode;
1233                 if (inode) {
1234                         if (is_bad_inode(inode)) {
1235                                 rc = -EIO;
1236                         } else {
1237                                 osd_id_gen(id, inode->i_ino,
1238                                            inode->i_generation);
1239                                 rc = 0;
1240                         }
1241                 }
1242                 /* if dentry is accessible after osd_compat_spec_insert it
1243                  * will still contain NULL inode, so don't keep it in cache */
1244                 d_invalidate(dentry);
1245                 dput(dentry);
1246         }
1247
1248         RETURN(rc);
1249 }