lustre/osd-ldiskfs/osd_compat.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/osd/osd_compat.c
  37  *
  38  * on-disk structure for managing /O
  39  *
  40  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  41  */
  42
  43 /* LUSTRE_VERSION_CODE */
  44 #include <lustre_ver.h>
  45 /* prerequisite for linux/xattr.h */
  46 #include <linux/types.h>
  47 /* prerequisite for linux/xattr.h */
  48 #include <linux/fs.h>
  49 /* XATTR_{REPLACE,CREATE} */
  50 #include <linux/xattr.h>
  51
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  * OBD_FAIL_CHECK
  55  */
  56 #include <obd_support.h>
  57
  58 #include "osd_internal.h"
  59 #include "osd_oi.h"
  60
  61 static void osd_push_ctxt(const struct osd_device *dev,
  62                           struct lvfs_run_ctxt *newctxt,
  63                           struct lvfs_run_ctxt *save)
  64 {
  65         OBD_SET_CTXT_MAGIC(newctxt);
  66         newctxt->pwdmnt = dev->od_mnt;
  67         newctxt->pwd = dev->od_mnt->mnt_root;
  68         newctxt->fs = get_ds();
  69
  70         push_ctxt(save, newctxt);
  71 }
  72
  73 /* utility to make a directory */
  74 static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
  75                                    const char *name, int mode, int fix)
  76 {
  77         struct dentry *dchild;
  78         int err = 0;
  79         ENTRY;
  80
  81         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  82         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  83         dchild = ll_lookup_one_len(name, dir, strlen(name));
  84         if (IS_ERR(dchild))
  85                 GOTO(out_up, dchild);
  86
  87         if (dchild->d_inode) {
  88                 int old_mode = dchild->d_inode->i_mode;
  89                 if (!S_ISDIR(old_mode)) {
  90                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  91                                dchild->d_inode->i_ino,
  92                                dchild->d_inode->i_generation, old_mode);
  93                         GOTO(out_err, err = -ENOTDIR);
  94                 }
  95
  96                 /* Fixup directory permissions if necessary */
  97                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
  98                         CDEBUG(D_CONFIG,
  99                                "fixing permissions on %s from %o to %o\n",
 100                                name, old_mode, mode);
 101                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 102                                                   (old_mode & ~S_IALLUGO);
 103                         mark_inode_dirty(dchild->d_inode);
 104                 }
 105                 GOTO(out_up, dchild);
 106         }
 107
 108         err = vfs_mkdir(dir->d_inode, dchild, mode);
 109         if (err)
 110                 GOTO(out_err, err);
 111
 112         RETURN(dchild);
 113
 114 out_err:
 115         dput(dchild);
 116         dchild = ERR_PTR(err);
 117 out_up:
 118         return dchild;
 119 }
 120
 121 int osd_last_rcvd_subdir_count(struct osd_device *osd)
 122 {
 123         struct lr_server_data lsd;
 124         struct dentry        *dlast;
 125         loff_t                off;
 126         int                   rc = 0;
 127         int                   count = OBJ_SUBDIR_COUNT;
 128
 129         ENTRY;
 130
 131         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 132                                   strlen(LAST_RCVD));
 133         if (IS_ERR(dlast))
 134                 return PTR_ERR(dlast);
 135         else if (dlast->d_inode == NULL)
 136                 goto out;
 137
 138         off = 0;
 139         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 140         if (rc == sizeof(lsd)) {
 141                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 142                        "subdir count = %d\n", lsd.lsd_uuid,
 143                        lsd.lsd_subdir_count);
 144                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 145                         count = le16_to_cpu(lsd.lsd_subdir_count);
 146         } else if (rc != 0) {
 147                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 148                 if (rc > 0)
 149                         rc = -EFAULT;
 150                 dput(dlast);
 151                 return rc;
 152         }
 153 out:
 154         dput(dlast);
 155         LASSERT(count > 0);
 156         return count;
 157 }
 158
 159 static const char remote_parent_dir[] = "REMOTE_PARENT_DIR";
 160 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 161 {
 162         struct lvfs_run_ctxt    new;
 163         struct lvfs_run_ctxt    save;
 164         struct dentry           *parent;
 165         struct osd_mdobj_map    *omm;
 166         struct dentry           *d;
 167         struct osd_thread_info  *info = osd_oti_get(env);
 168         struct lu_fid           *fid = &info->oti_fid3;
 169         int                     rc = 0;
 170         ENTRY;
 171
 172         OBD_ALLOC_PTR(dev->od_mdt_map);
 173         if (dev->od_mdt_map == NULL)
 174                 RETURN(-ENOMEM);
 175
 176         omm = dev->od_mdt_map;
 177
 178         parent = osd_sb(dev)->s_root;
 179         osd_push_ctxt(dev, &new, &save);
 180
 181         d = simple_mkdir(parent, dev->od_mnt, remote_parent_dir,
 182                          0755, 1);
 183         if (IS_ERR(d))
 184                 GOTO(cleanup, rc = PTR_ERR(d));
 185
 186         omm->omm_remote_parent = d;
 187
 188         /* Set LMA for remote parent inode */
 189         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 190         rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
 191
 192         GOTO(cleanup, rc);
 193
 194 cleanup:
 195         pop_ctxt(&save, &new);
 196         if (rc) {
 197                 if (omm->omm_remote_parent != NULL)
 198                         dput(omm->omm_remote_parent);
 199                 OBD_FREE_PTR(omm);
 200                 dev->od_mdt_map = NULL;
 201         }
 202         return rc;
 203 }
 204
 205 static void osd_mdt_fini(struct osd_device *osd)
 206 {
 207         struct osd_mdobj_map *omm = osd->od_mdt_map;
 208
 209         if (omm == NULL)
 210                 return;
 211
 212         if (omm->omm_remote_parent)
 213                 dput(omm->omm_remote_parent);
 214
 215         OBD_FREE_PTR(omm);
 216         osd->od_ost_map = NULL;
 217 }
 218
 219 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 220                              struct osd_object *obj, struct osd_thandle *oh)
 221 {
 222         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 223         struct osd_thread_info  *oti = osd_oti_get(env);
 224         struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
 225         char                    *name = oti->oti_name;
 226         struct dentry           *dentry;
 227         struct dentry           *parent;
 228         int                     rc;
 229
 230         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 231          * can identify this object quickly */
 232         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 233         if (rc != 0)
 234                 RETURN(rc);
 235
 236         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 237         lustre_lma_swab(lma);
 238         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 239                              sizeof(*lma), XATTR_REPLACE);
 240         if (rc != 0)
 241                 RETURN(rc);
 242
 243         parent = omm->omm_remote_parent;
 244         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 245         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 246                                            name, strlen(name));
 247         mutex_lock(&parent->d_inode->i_mutex);
 248         rc = osd_ldiskfs_add_entry(oh->ot_handle, dentry, obj->oo_inode,
 249                                    NULL);
 250         CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
 251                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 252         ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 253         mark_inode_dirty(parent->d_inode);
 254         mutex_unlock(&parent->d_inode->i_mutex);
 255         RETURN(rc);
 256 }
 257
 258 int osd_delete_from_remote_parent(const struct lu_env *env,
 259                                   struct osd_device *osd,
 260                                   struct osd_object *obj,
 261                                   struct osd_thandle *oh)
 262 {
 263         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 264         struct osd_thread_info     *oti = osd_oti_get(env);
 265         struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
 266         char                       *name = oti->oti_name;
 267         struct dentry              *dentry;
 268         struct dentry              *parent;
 269         struct ldiskfs_dir_entry_2 *de;
 270         struct buffer_head         *bh;
 271         int                        rc;
 272
 273         /* Check lma to see whether it is remote object */
 274         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 275         if (rc != 0)
 276                 RETURN(rc);
 277
 278         if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
 279                 RETURN(0);
 280
 281         parent = omm->omm_remote_parent;
 282         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 283         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 284                                            name, strlen(name));
 285         mutex_lock(&parent->d_inode->i_mutex);
 286         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 287                                     NULL, NULL);
 288         if (bh == NULL) {
 289                 mutex_unlock(&parent->d_inode->i_mutex);
 290                 RETURN(-ENOENT);
 291         }
 292         CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
 293                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 294         rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
 295         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 296         mark_inode_dirty(parent->d_inode);
 297         mutex_unlock(&parent->d_inode->i_mutex);
 298         brelse(bh);
 299
 300         /* Get rid of REMOTE_PARENT flag from incompat */
 301         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 302         lustre_lma_swab(lma);
 303         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 304                              sizeof(*lma), XATTR_REPLACE);
 305         RETURN(rc);
 306 }
 307
 308 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 309                                 struct osd_device *osd,
 310                                 const struct lu_fid *fid,
 311                                 struct osd_inode_id *id)
 312 {
 313         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 314         char                        *name = oti->oti_name;
 315         struct dentry               *parent;
 316         struct dentry               *dentry;
 317         struct ldiskfs_dir_entry_2 *de;
 318         struct buffer_head         *bh;
 319         int                         rc;
 320         ENTRY;
 321
 322         parent = omm->omm_remote_parent;
 323         sprintf(name, DFID_NOBRACE, PFID(fid));
 324         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 325                                            name, strlen(name));
 326         mutex_lock(&parent->d_inode->i_mutex);
 327         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 328                                     NULL, NULL);
 329         if (bh == NULL) {
 330                 rc = -ENOENT;
 331         } else {
 332                 rc = 0;
 333                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 334                 brelse(bh);
 335         }
 336         mutex_unlock(&parent->d_inode->i_mutex);
 337         if (rc == 0)
 338                 osd_add_oi_cache(oti, osd, id, fid);
 339         RETURN(rc);
 340 }
 341
 342 /*
 343  * directory structure on legacy OST:
 344  *
 345  * O/<seq>/d0-31/<objid>
 346  * O/<seq>/LAST_ID
 347  * last_rcvd
 348  * LAST_GROUP
 349  * CONFIGS
 350  *
 351  */
 352 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 353 {
 354         struct lvfs_run_ctxt     new;
 355         struct lvfs_run_ctxt     save;
 356         struct dentry           *rootd = osd_sb(dev)->s_root;
 357         struct dentry           *d;
 358         struct osd_thread_info  *info = osd_oti_get(env);
 359         struct inode            *inode;
 360         struct lu_fid           *fid = &info->oti_fid3;
 361         int                      rc;
 362         ENTRY;
 363
 364         OBD_ALLOC_PTR(dev->od_ost_map);
 365         if (dev->od_ost_map == NULL)
 366                 RETURN(-ENOMEM);
 367
 368         /* to get subdir count from last_rcvd */
 369         rc = osd_last_rcvd_subdir_count(dev);
 370         if (rc < 0) {
 371                 OBD_FREE_PTR(dev->od_ost_map);
 372                 RETURN(rc);
 373         }
 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, 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, 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
 409         GOTO(cleanup, rc);
 410
 411 cleanup:
 412         pop_ctxt(&save, &new);
 413         if (IS_ERR(d)) {
 414                 OBD_FREE_PTR(dev->od_ost_map);
 415                 RETURN(PTR_ERR(d));
 416         }
 417         return rc;
 418 }
 419
 420 static void osd_seq_free(struct osd_obj_map *map,
 421                          struct osd_obj_seq *osd_seq)
 422 {
 423         int j;
 424
 425         list_del_init(&osd_seq->oos_seq_list);
 426
 427         if (osd_seq->oos_dirs) {
 428                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 429                         if (osd_seq->oos_dirs[j])
 430                                 dput(osd_seq->oos_dirs[j]);
 431                 }
 432                 OBD_FREE(osd_seq->oos_dirs,
 433                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 434         }
 435
 436         if (osd_seq->oos_root)
 437                 dput(osd_seq->oos_root);
 438
 439         OBD_FREE_PTR(osd_seq);
 440 }
 441
 442 static void osd_ost_fini(struct osd_device *osd)
 443 {
 444         struct osd_obj_seq    *osd_seq;
 445         struct osd_obj_seq    *tmp;
 446         struct osd_obj_map    *map = osd->od_ost_map;
 447         ENTRY;
 448
 449         if (map == NULL)
 450                 return;
 451
 452         write_lock(&map->om_seq_list_lock);
 453         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 454                                  oos_seq_list) {
 455                 osd_seq_free(map, osd_seq);
 456         }
 457         write_unlock(&map->om_seq_list_lock);
 458         if (map->om_root)
 459                 dput(map->om_root);
 460         OBD_FREE_PTR(map);
 461         osd->od_ost_map = NULL;
 462         EXIT;
 463 }
 464
 465 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 466 {
 467         int rc;
 468         ENTRY;
 469
 470         /* prepare structures for OST */
 471         rc = osd_ost_init(env, dev);
 472         if (rc)
 473                 RETURN(rc);
 474
 475         /* prepare structures for MDS */
 476         rc = osd_mdt_init(env, dev);
 477
 478         RETURN(rc);
 479 }
 480
 481 struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, obd_seq seq)
 482 {
 483         struct osd_obj_seq *osd_seq;
 484
 485         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 486                 if (osd_seq->oos_seq == seq)
 487                         return osd_seq;
 488         }
 489         return NULL;
 490 }
 491
 492 struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, obd_seq seq)
 493 {
 494         struct osd_obj_seq *osd_seq;
 495
 496         read_lock(&map->om_seq_list_lock);
 497         osd_seq = osd_seq_find_locked(map, seq);
 498         read_unlock(&map->om_seq_list_lock);
 499         return osd_seq;
 500 }
 501
 502 void osd_obj_map_fini(struct osd_device *dev)
 503 {
 504         osd_ost_fini(dev);
 505         osd_mdt_fini(dev);
 506 }
 507
 508 /**
 509  * Update the specified OI mapping.
 510  *
 511  * \retval   1, changed nothing
 512  * \retval   0, changed successfully
 513  * \retval -ve, on error
 514  */
 515 static int osd_obj_update_entry(struct osd_thread_info *info,
 516                                 struct osd_device *osd,
 517                                 struct dentry *dir, const char *name,
 518                                 const struct lu_fid *fid,
 519                                 const struct osd_inode_id *id,
 520                                 handle_t *th)
 521 {
 522         struct inode               *parent = dir->d_inode;
 523         struct dentry              *child;
 524         struct ldiskfs_dir_entry_2 *de;
 525         struct buffer_head         *bh;
 526         struct inode               *inode;
 527         struct dentry              *dentry = &info->oti_obj_dentry;
 528         struct osd_inode_id        *oi_id  = &info->oti_id3;
 529         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 530         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 531         int                         rc;
 532         ENTRY;
 533
 534         LASSERT(th != NULL);
 535         LASSERT(th->h_transaction != NULL);
 536
 537         child = &info->oti_child_dentry;
 538         child->d_parent = dir;
 539         child->d_name.hash = 0;
 540         child->d_name.name = name;
 541         child->d_name.len = strlen(name);
 542
 543         ll_vfs_dq_init(parent);
 544         mutex_lock(&parent->i_mutex);
 545         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 546         if (bh == NULL)
 547                 GOTO(out, rc = -ENOENT);
 548
 549         if (le32_to_cpu(de->inode) == id->oii_ino)
 550                 GOTO(out, rc = 1);
 551
 552         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 553         inode = osd_iget(info, osd, oi_id);
 554         if (IS_ERR(inode)) {
 555                 rc = PTR_ERR(inode);
 556                 if (rc == -ENOENT || rc == -ESTALE)
 557                         goto update;
 558                 GOTO(out, rc);
 559         }
 560
 561         rc = osd_get_lma(info, inode, dentry, lma);
 562         if (rc == -ENODATA) {
 563                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 564                 if (rc > 0) {
 565                         oi_fid = NULL;
 566                         rc = 0;
 567                 }
 568         }
 569         iput(inode);
 570
 571         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 572          * either a crashed object or a uninitialized one. Replace it. */
 573         if (rc == -ENODATA || oi_fid == NULL)
 574                 goto update;
 575
 576         if (rc != 0)
 577                 GOTO(out, rc);
 578
 579         if (lu_fid_eq(fid, oi_fid)) {
 580                 CERROR("%s: the FID "DFID" is used by two objects: "
 581                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 582                        oi_id->oii_ino, oi_id->oii_gen,
 583                        id->oii_ino, id->oii_gen);
 584                 GOTO(out, rc = -EEXIST);
 585         }
 586
 587 update:
 588         /* There may be temporary inconsistency: On one hand, the new
 589          * object may be referenced by multiple entries, which is out
 590          * of our control unless we traverse the whole /O completely,
 591          * which is non-flat order and inefficient, should be avoided;
 592          * On the other hand, the old object may become orphan if it
 593          * is still valid. Since it was referenced by an invalid entry,
 594          * making it as invisible temporary may be not worse. OI scrub
 595          * will process it later. */
 596         rc = ldiskfs_journal_get_write_access(th, bh);
 597         if (rc != 0)
 598                 GOTO(out, rc);
 599
 600         de->inode = cpu_to_le32(id->oii_ino);
 601         rc = ldiskfs_journal_dirty_metadata(th, bh);
 602
 603         GOTO(out, rc);
 604
 605 out:
 606         brelse(bh);
 607         mutex_unlock(&parent->i_mutex);
 608         return rc;
 609 }
 610
 611 static int osd_obj_del_entry(struct osd_thread_info *info,
 612                              struct osd_device *osd,
 613                              struct dentry *dird, char *name,
 614                              handle_t *th)
 615 {
 616         struct ldiskfs_dir_entry_2 *de;
 617         struct buffer_head         *bh;
 618         struct dentry              *child;
 619         struct inode               *dir = dird->d_inode;
 620         int                         rc;
 621         ENTRY;
 622
 623         LASSERT(th != NULL);
 624         LASSERT(th->h_transaction != NULL);
 625
 626
 627         child = &info->oti_child_dentry;
 628         child->d_name.hash = 0;
 629         child->d_name.name = name;
 630         child->d_name.len = strlen(name);
 631         child->d_parent = dird;
 632         child->d_inode = NULL;
 633
 634         ll_vfs_dq_init(dir);
 635         mutex_lock(&dir->i_mutex);
 636         rc = -ENOENT;
 637         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 638         if (bh) {
 639                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 640                 brelse(bh);
 641         }
 642         mutex_unlock(&dir->i_mutex);
 643
 644         RETURN(rc);
 645 }
 646
 647 int osd_obj_add_entry(struct osd_thread_info *info,
 648                       struct osd_device *osd,
 649                       struct dentry *dir, char *name,
 650                       const struct osd_inode_id *id,
 651                       handle_t *th)
 652 {
 653         struct dentry *child;
 654         struct inode *inode;
 655         int rc;
 656
 657         ENTRY;
 658
 659         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 660                 RETURN(0);
 661
 662         LASSERT(th != NULL);
 663         LASSERT(th->h_transaction != NULL);
 664
 665         inode = &info->oti_inode;
 666         inode->i_sb = osd_sb(osd);
 667         osd_id_to_inode(inode, id);
 668         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 669
 670         child = &info->oti_child_dentry;
 671         child->d_name.hash = 0;
 672         child->d_name.name = name;
 673         child->d_name.len = strlen(name);
 674         child->d_parent = dir;
 675         child->d_inode = inode;
 676
 677         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 678                 inode->i_ino++;
 679
 680         ll_vfs_dq_init(dir->d_inode);
 681         mutex_lock(&dir->d_inode->i_mutex);
 682         rc = osd_ldiskfs_add_entry(th, child, inode, NULL);
 683         mutex_unlock(&dir->d_inode->i_mutex);
 684
 685         RETURN(rc);
 686 }
 687
 688 /**
 689  * Use LPU64 for legacy OST sequences, but use LPX64i for new
 690  * sequences names, so that the O/{seq}/dN/{oid} more closely
 691  * follows the DFID/PFID format. This makes it easier to map from
 692  * debug messages to objects in the future, and the legacy space
 693  * of FID_SEQ_OST_MDT0 will be unused in the future.
 694  **/
 695 static inline void osd_seq_name(char *seq_name, size_t name_size, obd_seq seq)
 696 {
 697         snprintf(seq_name, name_size,
 698                  (fid_seq_is_rsvd(seq) ||
 699                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
 700                  fid_seq_is_idif(seq) ? 0 : seq);
 701 }
 702
 703 static inline void osd_oid_name(char *name, size_t name_size,
 704                                 const struct lu_fid *fid, obd_id id)
 705 {
 706         snprintf(name, name_size,
 707                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 708                   fid_seq_is_mdt0(fid_seq(fid)) ||
 709                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 710 }
 711
 712 /* external locking is required */
 713 static int osd_seq_load_locked(struct osd_thread_info *info,
 714                                struct osd_device *osd,
 715                                struct osd_obj_seq *osd_seq)
 716 {
 717         struct osd_obj_map  *map = osd->od_ost_map;
 718         struct dentry       *seq_dir;
 719         struct inode        *inode;
 720         struct lu_fid       *fid = &info->oti_fid3;
 721         int                 rc = 0;
 722         int                 i;
 723         char                dir_name[32];
 724         ENTRY;
 725
 726         if (osd_seq->oos_root != NULL)
 727                 RETURN(0);
 728
 729         LASSERT(map);
 730         LASSERT(map->om_root);
 731
 732         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 733
 734         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 735         if (IS_ERR(seq_dir))
 736                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 737         else if (seq_dir->d_inode == NULL)
 738                 GOTO(out_put, rc = -EFAULT);
 739
 740         inode = seq_dir->d_inode;
 741         osd_seq->oos_root = seq_dir;
 742
 743         /* 'What the @fid is' is not imporatant, because the object
 744          * has no OI mapping, and only is visible inside the OSD.*/
 745         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 746         rc = osd_ea_fid_set(info, inode, fid,
 747                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 748         if (rc != 0)
 749                 GOTO(out_put, rc);
 750
 751         LASSERT(osd_seq->oos_dirs == NULL);
 752         OBD_ALLOC(osd_seq->oos_dirs,
 753                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 754         if (osd_seq->oos_dirs == NULL)
 755                 GOTO(out_put, rc = -ENOMEM);
 756
 757         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 758                 struct dentry   *dir;
 759
 760                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 761                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 762                                    0700, 1);
 763                 if (IS_ERR(dir)) {
 764                         GOTO(out_free, rc = PTR_ERR(dir));
 765                 } else if (dir->d_inode == NULL) {
 766                         dput(dir);
 767                         GOTO(out_free, rc = -EFAULT);
 768                 }
 769
 770                 inode = dir->d_inode;
 771                 osd_seq->oos_dirs[i] = dir;
 772
 773                 /* 'What the @fid is' is not imporatant, because the object
 774                  * has no OI mapping, and only is visible inside the OSD.*/
 775                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 776                 rc = osd_ea_fid_set(info, inode, fid,
 777                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 778                 if (rc != 0)
 779                         GOTO(out_free, rc);
 780         }
 781
 782         if (rc != 0) {
 783 out_free:
 784                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 785                         if (osd_seq->oos_dirs[i] != NULL)
 786                                 dput(osd_seq->oos_dirs[i]);
 787                 }
 788                 OBD_FREE(osd_seq->oos_dirs,
 789                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 790 out_put:
 791                 dput(seq_dir);
 792                 osd_seq->oos_root = NULL;
 793         }
 794 out_err:
 795         RETURN(rc);
 796 }
 797
 798 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 799                                         struct osd_device *osd, obd_seq seq)
 800 {
 801         struct osd_obj_map      *map;
 802         struct osd_obj_seq      *osd_seq;
 803         int                     rc = 0;
 804         ENTRY;
 805
 806         map = osd->od_ost_map;
 807         LASSERT(map);
 808         LASSERT(map->om_root);
 809
 810         osd_seq = osd_seq_find(map, seq);
 811         if (likely(osd_seq != NULL))
 812                 RETURN(osd_seq);
 813
 814         /* Serializing init process */
 815         mutex_lock(&map->om_dir_init_mutex);
 816
 817         /* Check whether the seq has been added */
 818         read_lock(&map->om_seq_list_lock);
 819         osd_seq = osd_seq_find_locked(map, seq);
 820         if (osd_seq != NULL) {
 821                 read_unlock(&map->om_seq_list_lock);
 822                 GOTO(cleanup, rc = 0);
 823         }
 824         read_unlock(&map->om_seq_list_lock);
 825
 826         OBD_ALLOC_PTR(osd_seq);
 827         if (osd_seq == NULL)
 828                 GOTO(cleanup, rc = -ENOMEM);
 829
 830         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 831         osd_seq->oos_seq = seq;
 832         /* Init subdir count to be 32, but each seq can have
 833          * different subdir count */
 834         osd_seq->oos_subdir_count = map->om_subdir_count;
 835         rc = osd_seq_load_locked(info, osd, osd_seq);
 836         if (rc != 0)
 837                 GOTO(cleanup, rc);
 838
 839         write_lock(&map->om_seq_list_lock);
 840         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 841         write_unlock(&map->om_seq_list_lock);
 842
 843 cleanup:
 844         mutex_unlock(&map->om_dir_init_mutex);
 845         if (rc != 0) {
 846                 if (osd_seq != NULL)
 847                         OBD_FREE_PTR(osd_seq);
 848                 RETURN(ERR_PTR(rc));
 849         }
 850
 851         RETURN(osd_seq);
 852 }
 853
 854 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 855                        const struct lu_fid *fid, struct osd_inode_id *id)
 856 {
 857         struct osd_obj_map              *map;
 858         struct osd_obj_seq              *osd_seq;
 859         struct dentry                   *d_seq;
 860         struct dentry                   *child;
 861         struct ost_id                   *ostid = &info->oti_ostid;
 862         int                             dirn;
 863         char                            name[32];
 864         struct ldiskfs_dir_entry_2      *de;
 865         struct buffer_head              *bh;
 866         struct inode                    *dir;
 867         struct inode                    *inode;
 868         ENTRY;
 869
 870         /* on the very first lookup we find and open directories */
 871
 872         map = dev->od_ost_map;
 873         LASSERT(map);
 874         LASSERT(map->om_root);
 875
 876         fid_to_ostid(fid, ostid);
 877         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 878         if (IS_ERR(osd_seq))
 879                 RETURN(PTR_ERR(osd_seq));
 880
 881         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 882         d_seq = osd_seq->oos_dirs[dirn];
 883         LASSERT(d_seq);
 884
 885         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 886
 887         child = &info->oti_child_dentry;
 888         child->d_parent = d_seq;
 889         child->d_name.hash = 0;
 890         child->d_name.name = name;
 891         /* XXX: we can use rc from sprintf() instead of strlen() */
 892         child->d_name.len = strlen(name);
 893
 894         dir = d_seq->d_inode;
 895         mutex_lock(&dir->i_mutex);
 896         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 897         mutex_unlock(&dir->i_mutex);
 898
 899         if (bh == NULL)
 900                 RETURN(-ENOENT);
 901
 902         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 903         brelse(bh);
 904
 905         inode = osd_iget(info, dev, id);
 906         if (IS_ERR(inode))
 907                 RETURN(PTR_ERR(inode));
 908
 909         iput(inode);
 910         RETURN(0);
 911 }
 912
 913 int osd_obj_map_insert(struct osd_thread_info *info,
 914                        struct osd_device *osd,
 915                        const struct lu_fid *fid,
 916                        const struct osd_inode_id *id,
 917                        handle_t *th)
 918 {
 919         struct osd_obj_map      *map;
 920         struct osd_obj_seq      *osd_seq;
 921         struct dentry           *d;
 922         struct ost_id           *ostid = &info->oti_ostid;
 923         obd_id                   oid;
 924         int                     dirn, rc = 0;
 925         char                    name[32];
 926         ENTRY;
 927
 928         map = osd->od_ost_map;
 929         LASSERT(map);
 930
 931         /* map fid to seq:objid */
 932         fid_to_ostid(fid, ostid);
 933
 934         oid = ostid_id(ostid);
 935         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 936         if (IS_ERR(osd_seq))
 937                 RETURN(PTR_ERR(osd_seq));
 938
 939         dirn = oid & (osd_seq->oos_subdir_count - 1);
 940         d = osd_seq->oos_dirs[dirn];
 941         LASSERT(d);
 942
 943         osd_oid_name(name, sizeof(name), fid, oid);
 944
 945 again:
 946         rc = osd_obj_add_entry(info, osd, d, name, id, th);
 947         if (rc == -EEXIST) {
 948                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
 949                 if (unlikely(rc == -ENOENT))
 950                         goto again;
 951
 952                 if (unlikely(rc == 1))
 953                         RETURN(0);
 954         }
 955
 956         RETURN(rc);
 957 }
 958
 959 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
 960                        const struct lu_fid *fid, handle_t *th)
 961 {
 962         struct osd_obj_map      *map;
 963         struct osd_obj_seq      *osd_seq;
 964         struct dentry           *d;
 965         struct ost_id           *ostid = &info->oti_ostid;
 966         int                     dirn, rc = 0;
 967         char                    name[32];
 968         ENTRY;
 969
 970         map = osd->od_ost_map;
 971         LASSERT(map);
 972
 973         /* map fid to seq:objid */
 974         fid_to_ostid(fid, ostid);
 975
 976         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 977         if (IS_ERR(osd_seq))
 978                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
 979
 980         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 981         d = osd_seq->oos_dirs[dirn];
 982         LASSERT(d);
 983
 984         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 985         rc = osd_obj_del_entry(info, osd, d, name, th);
 986 cleanup:
 987         RETURN(rc);
 988 }
 989
 990 int osd_obj_map_update(struct osd_thread_info *info,
 991                        struct osd_device *osd,
 992                        const struct lu_fid *fid,
 993                        const struct osd_inode_id *id,
 994                        handle_t *th)
 995 {
 996         struct osd_obj_seq      *osd_seq;
 997         struct dentry           *d;
 998         struct ost_id           *ostid = &info->oti_ostid;
 999         int                     dirn, rc = 0;
1000         char                    name[32];
1001         ENTRY;
1002
1003         fid_to_ostid(fid, ostid);
1004         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1005         if (IS_ERR(osd_seq))
1006                 RETURN(PTR_ERR(osd_seq));
1007
1008         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1009         d = osd_seq->oos_dirs[dirn];
1010         LASSERT(d);
1011
1012         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1013         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1014
1015         RETURN(rc);
1016 }
1017
1018 int osd_obj_map_recover(struct osd_thread_info *info,
1019                         struct osd_device *osd,
1020                         struct inode *src_parent,
1021                         struct dentry *src_child,
1022                         const struct lu_fid *fid)
1023 {
1024         struct osd_obj_seq         *osd_seq;
1025         struct dentry              *tgt_parent;
1026         struct dentry              *tgt_child = &info->oti_child_dentry;
1027         struct inode               *dir;
1028         struct inode               *inode     = src_child->d_inode;
1029         struct ost_id              *ostid     = &info->oti_ostid;
1030         handle_t                   *jh;
1031         struct ldiskfs_dir_entry_2 *de;
1032         struct buffer_head         *bh;
1033         char                        name[32];
1034         int                         dirn;
1035         int                         rc        = 0;
1036         ENTRY;
1037
1038         if (fid_is_last_id(fid)) {
1039                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1040                 if (IS_ERR(osd_seq))
1041                         RETURN(PTR_ERR(osd_seq));
1042
1043                 tgt_parent = osd_seq->oos_root;
1044                 tgt_child->d_name.name = "LAST_ID";
1045                 tgt_child->d_name.len = strlen("LAST_ID");
1046         } else {
1047                 fid_to_ostid(fid, ostid);
1048                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1049                 if (IS_ERR(osd_seq))
1050                         RETURN(PTR_ERR(osd_seq));
1051
1052                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1053                 tgt_parent = osd_seq->oos_dirs[dirn];
1054                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1055                 tgt_child->d_name.name = name;
1056                 tgt_child->d_name.len = strlen(name);
1057         }
1058         LASSERT(tgt_parent != NULL);
1059
1060         dir = tgt_parent->d_inode;
1061         tgt_child->d_name.hash = 0;
1062         tgt_child->d_parent = tgt_parent;
1063         tgt_child->d_inode = inode;
1064
1065         /* The non-initialized src_child may be destroyed. */
1066         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1067                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1068                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1069                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1070         if (IS_ERR(jh))
1071                 RETURN(PTR_ERR(jh));
1072
1073         ll_vfs_dq_init(src_parent);
1074         ll_vfs_dq_init(dir);
1075
1076         mutex_lock(&src_parent->i_mutex);
1077         mutex_lock(&dir->i_mutex);
1078         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1079         if (bh != NULL) {
1080                 /* XXX: If some other object occupied the same slot. And If such
1081                  *      inode is zero-sized and with SUID+SGID, then means it is
1082                  *      a new created one. Maybe we can remove it and insert the
1083                  *      original one back to the /O/<seq>/d<x>. But there are
1084                  *      something to be considered:
1085                  *
1086                  *      1) The OST-object under /lost+found has crashed LMA.
1087                  *         So it should not conflict with the current one.
1088                  *
1089                  *      2) There are race conditions that: someone may just want
1090                  *         to modify the current one. Even if the OI scrub takes
1091                  *         the object lock when remove the current one, it still
1092                  *         cause the modification to be lost becasue the target
1093                  *         has been removed when the RPC service thread waiting
1094                  *         for the lock.
1095                  *
1096                  *      So keep it there before we have suitable solution. */
1097                 brelse(bh);
1098                 mutex_unlock(&dir->i_mutex);
1099                 mutex_unlock(&src_parent->i_mutex);
1100                 ldiskfs_journal_stop(jh);
1101
1102                 rc = -EEXIST;
1103                 /* If the src object has never been modified, then remove it. */
1104                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1105                     inode->i_mode & S_ISGID) {
1106                         rc = ll_vfs_unlink(src_parent, src_child);
1107                         if (unlikely(rc == -ENOENT))
1108                                 rc = 0;
1109                 }
1110                 RETURN(rc);
1111         }
1112
1113         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1114                                     NULL, NULL);
1115         if (unlikely(bh == NULL))
1116                 GOTO(unlock, rc = -ENOENT);
1117
1118         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1119         brelse(bh);
1120         if (rc != 0)
1121                 GOTO(unlock, rc);
1122
1123         rc = osd_ldiskfs_add_entry(jh, tgt_child, inode, NULL);
1124
1125         GOTO(unlock, rc);
1126
1127 unlock:
1128         mutex_unlock(&dir->i_mutex);
1129         mutex_unlock(&src_parent->i_mutex);
1130         ldiskfs_journal_stop(jh);
1131         return rc;
1132 }
1133
1134 static struct dentry *
1135 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1136                      const struct lu_fid *fid, char **name)
1137 {
1138         struct dentry *root = ERR_PTR(-ENOENT);
1139
1140         if (fid_is_last_id(fid)) {
1141                 struct osd_obj_seq *osd_seq;
1142
1143                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1144                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1145                 if (IS_ERR(osd_seq))
1146                         RETURN((struct dentry *)osd_seq);
1147
1148                 *name = "LAST_ID";
1149                 root = osd_seq->oos_root;
1150         } else {
1151                 *name = osd_lf_fid2name(fid);
1152                 if (*name == NULL)
1153                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1154                 else if ((*name)[0])
1155                         root = osd_sb(osd)->s_root;
1156         }
1157
1158         return root;
1159 }
1160
1161 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1162                         const struct lu_fid *fid, const struct osd_inode_id *id,
1163                         handle_t *th)
1164 {
1165         struct dentry   *root;
1166         char            *name = NULL;
1167         int              rc;
1168         ENTRY;
1169
1170         root = osd_object_spec_find(info, osd, fid, &name);
1171         if (!IS_ERR(root)) {
1172                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1173         } else {
1174                 rc = PTR_ERR(root);
1175                 if (rc == -ENOENT)
1176                         rc = 1;
1177         }
1178
1179         RETURN(rc);
1180 }
1181
1182 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1183                         const struct lu_fid *fid, const struct osd_inode_id *id,
1184                         handle_t *th)
1185 {
1186         struct dentry   *root;
1187         char            *name = NULL;
1188         int              rc;
1189         ENTRY;
1190
1191         root = osd_object_spec_find(info, osd, fid, &name);
1192         if (!IS_ERR(root)) {
1193                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1194         } else {
1195                 rc = PTR_ERR(root);
1196                 if (rc == -ENOENT)
1197                         rc = 0;
1198         }
1199
1200         RETURN(rc);
1201 }
1202
1203 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1204                         const struct lu_fid *fid, struct osd_inode_id *id)
1205 {
1206         struct dentry   *root;
1207         struct dentry   *dentry;
1208         struct inode    *inode;
1209         char            *name = NULL;
1210         int             rc = -ENOENT;
1211         ENTRY;
1212
1213         if (fid_is_last_id(fid)) {
1214                 struct osd_obj_seq *osd_seq;
1215
1216                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1217                 if (IS_ERR(osd_seq))
1218                         RETURN(PTR_ERR(osd_seq));
1219                 root = osd_seq->oos_root;
1220                 name = "LAST_ID";
1221         } else {
1222                 root = osd_sb(osd)->s_root;
1223                 name = osd_lf_fid2name(fid);
1224                 if (name == NULL || strlen(name) == 0)
1225                         RETURN(-ENOENT);
1226         }
1227
1228         dentry = ll_lookup_one_len(name, root, strlen(name));
1229         if (!IS_ERR(dentry)) {
1230                 inode = dentry->d_inode;
1231                 if (inode) {
1232                         if (is_bad_inode(inode)) {
1233                                 rc = -EIO;
1234                         } else {
1235                                 osd_id_gen(id, inode->i_ino,
1236                                            inode->i_generation);
1237                                 rc = 0;
1238                         }
1239                 }
1240                 /* if dentry is accessible after osd_compat_spec_insert it
1241                  * will still contain NULL inode, so don't keep it in cache */
1242                 d_invalidate(dentry);
1243                 dput(dentry);
1244         }
1245
1246         RETURN(rc);
1247 }