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