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