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, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/osd/osd_compat.c
  37  *
  38  * on-disk structure for managing /O
  39  *
  40  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  41  */
  42
  43 /* LUSTRE_VERSION_CODE */
  44 #include <lustre_ver.h>
  45 /* prerequisite for linux/xattr.h */
  46 #include <linux/types.h>
  47 /* prerequisite for linux/xattr.h */
  48 #include <linux/fs.h>
  49 /* XATTR_{REPLACE,CREATE} */
  50 #include <linux/xattr.h>
  51
  52 /*
  53  * struct OBD_{ALLOC,FREE}*()
  54  * OBD_FAIL_CHECK
  55  */
  56 #include <obd_support.h>
  57
  58 #include "osd_internal.h"
  59 #include "osd_oi.h"
  60
  61 static void osd_push_ctxt(const struct osd_device *dev,
  62                           struct lvfs_run_ctxt *newctxt,
  63                           struct lvfs_run_ctxt *save)
  64 {
  65         OBD_SET_CTXT_MAGIC(newctxt);
  66         newctxt->pwdmnt = dev->od_mnt;
  67         newctxt->pwd = dev->od_mnt->mnt_root;
  68         newctxt->fs = get_ds();
  69         newctxt->umask = current_umask();
  70         newctxt->dt = NULL;
  71
  72         push_ctxt(save, newctxt);
  73 }
  74
  75 /* utility to make a directory */
  76 static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
  77                                    const char *name, int mode, int fix)
  78 {
  79         struct dentry *dchild;
  80         int err = 0;
  81         ENTRY;
  82
  83         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  84         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  85         dchild = ll_lookup_one_len(name, dir, strlen(name));
  86         if (IS_ERR(dchild))
  87                 GOTO(out_up, dchild);
  88
  89         if (dchild->d_inode) {
  90                 int old_mode = dchild->d_inode->i_mode;
  91                 if (!S_ISDIR(old_mode)) {
  92                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  93                                dchild->d_inode->i_ino,
  94                                dchild->d_inode->i_generation, old_mode);
  95                         GOTO(out_err, err = -ENOTDIR);
  96                 }
  97
  98                 /* Fixup directory permissions if necessary */
  99                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 100                         CDEBUG(D_CONFIG,
 101                                "fixing permissions on %s from %o to %o\n",
 102                                name, old_mode, mode);
 103                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 104                                                   (old_mode & ~S_IALLUGO);
 105                         mark_inode_dirty(dchild->d_inode);
 106                 }
 107                 GOTO(out_up, dchild);
 108         }
 109
 110         err = vfs_mkdir(dir->d_inode, dchild, mode);
 111         if (err)
 112                 GOTO(out_err, err);
 113
 114         RETURN(dchild);
 115
 116 out_err:
 117         dput(dchild);
 118         dchild = ERR_PTR(err);
 119 out_up:
 120         return dchild;
 121 }
 122
 123 static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 124 {
 125         struct lr_server_data lsd;
 126         struct dentry        *dlast;
 127         loff_t                off;
 128         int                   rc = 0;
 129         int                   count = OBJ_SUBDIR_COUNT;
 130
 131         ENTRY;
 132
 133         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 134                                   strlen(LAST_RCVD));
 135         if (IS_ERR(dlast))
 136                 return PTR_ERR(dlast);
 137         else if (dlast->d_inode == NULL)
 138                 goto out;
 139
 140         off = 0;
 141         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 142         if (rc == sizeof(lsd)) {
 143                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 144                        "subdir count = %d\n", lsd.lsd_uuid,
 145                        lsd.lsd_subdir_count);
 146                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 147                         count = le16_to_cpu(lsd.lsd_subdir_count);
 148         } else if (rc != 0) {
 149                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 150                 if (rc > 0)
 151                         rc = -EFAULT;
 152                 dput(dlast);
 153                 return rc;
 154         }
 155 out:
 156         dput(dlast);
 157         LASSERT(count > 0);
 158         return count;
 159 }
 160
 161 static const char remote_parent_dir[] = "REMOTE_PARENT_DIR";
 162 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 163 {
 164         struct lvfs_run_ctxt    new;
 165         struct lvfs_run_ctxt    save;
 166         struct dentry           *parent;
 167         struct osd_mdobj_map    *omm;
 168         struct dentry           *d;
 169         struct osd_thread_info  *info = osd_oti_get(env);
 170         struct lu_fid           *fid = &info->oti_fid3;
 171         int                     rc = 0;
 172         ENTRY;
 173
 174         OBD_ALLOC_PTR(dev->od_mdt_map);
 175         if (dev->od_mdt_map == NULL)
 176                 RETURN(-ENOMEM);
 177
 178         omm = dev->od_mdt_map;
 179
 180         parent = osd_sb(dev)->s_root;
 181         osd_push_ctxt(dev, &new, &save);
 182
 183         d = simple_mkdir(parent, dev->od_mnt, remote_parent_dir,
 184                          0755, 1);
 185         if (IS_ERR(d))
 186                 GOTO(cleanup, rc = PTR_ERR(d));
 187
 188         omm->omm_remote_parent = d;
 189
 190         /* Set LMA for remote parent inode */
 191         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 192         rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
 193
 194         GOTO(cleanup, rc);
 195
 196 cleanup:
 197         pop_ctxt(&save, &new);
 198         if (rc) {
 199                 if (omm->omm_remote_parent != NULL)
 200                         dput(omm->omm_remote_parent);
 201                 OBD_FREE_PTR(omm);
 202                 dev->od_mdt_map = NULL;
 203         }
 204         return rc;
 205 }
 206
 207 static void osd_mdt_fini(struct osd_device *osd)
 208 {
 209         struct osd_mdobj_map *omm = osd->od_mdt_map;
 210
 211         if (omm == NULL)
 212                 return;
 213
 214         if (omm->omm_remote_parent)
 215                 dput(omm->omm_remote_parent);
 216
 217         OBD_FREE_PTR(omm);
 218         osd->od_ost_map = NULL;
 219 }
 220
 221 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 222                              struct osd_object *obj, struct osd_thandle *oh)
 223 {
 224         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 225         struct osd_thread_info  *oti = osd_oti_get(env);
 226         struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
 227         char                    *name = oti->oti_name;
 228         struct osd_thread_info  *info = osd_oti_get(env);
 229         struct dentry           *dentry;
 230         struct dentry           *parent;
 231         int                     rc;
 232
 233         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 234          * can identify this object quickly */
 235         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 236         if (rc != 0)
 237                 RETURN(rc);
 238
 239         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 240         lustre_lma_swab(lma);
 241         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 242                              sizeof(*lma), XATTR_REPLACE);
 243         if (rc != 0)
 244                 RETURN(rc);
 245
 246         parent = omm->omm_remote_parent;
 247         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 248         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 249                                            name, strlen(name));
 250         mutex_lock(&parent->d_inode->i_mutex);
 251         rc = osd_ldiskfs_add_entry(info, oh->ot_handle, dentry,
 252                                    obj->oo_inode, NULL);
 253         CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
 254                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 255         ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 256         mark_inode_dirty(parent->d_inode);
 257         mutex_unlock(&parent->d_inode->i_mutex);
 258         RETURN(rc);
 259 }
 260
 261 int osd_delete_from_remote_parent(const struct lu_env *env,
 262                                   struct osd_device *osd,
 263                                   struct osd_object *obj,
 264                                   struct osd_thandle *oh)
 265 {
 266         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 267         struct osd_thread_info     *oti = osd_oti_get(env);
 268         struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
 269         char                       *name = oti->oti_name;
 270         struct dentry              *dentry;
 271         struct dentry              *parent;
 272         struct ldiskfs_dir_entry_2 *de;
 273         struct buffer_head         *bh;
 274         int                        rc;
 275
 276         /* Check lma to see whether it is remote object */
 277         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
 278         if (rc != 0)
 279                 RETURN(rc);
 280
 281         if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
 282                 RETURN(0);
 283
 284         parent = omm->omm_remote_parent;
 285         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 286         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 287                                            name, strlen(name));
 288         mutex_lock(&parent->d_inode->i_mutex);
 289         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 290                                     NULL, NULL);
 291         if (bh == NULL) {
 292                 mutex_unlock(&parent->d_inode->i_mutex);
 293                 RETURN(-ENOENT);
 294         }
 295         CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
 296                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
 297         rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
 298         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 299         mark_inode_dirty(parent->d_inode);
 300         mutex_unlock(&parent->d_inode->i_mutex);
 301         brelse(bh);
 302
 303         /* Get rid of REMOTE_PARENT flag from incompat */
 304         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 305         lustre_lma_swab(lma);
 306         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 307                              sizeof(*lma), XATTR_REPLACE);
 308         RETURN(rc);
 309 }
 310
 311 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 312                                 struct osd_device *osd,
 313                                 const struct lu_fid *fid,
 314                                 struct osd_inode_id *id)
 315 {
 316         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 317         char                        *name = oti->oti_name;
 318         struct dentry               *parent;
 319         struct dentry               *dentry;
 320         struct ldiskfs_dir_entry_2 *de;
 321         struct buffer_head         *bh;
 322         int                         rc;
 323         ENTRY;
 324
 325         parent = omm->omm_remote_parent;
 326         sprintf(name, DFID_NOBRACE, PFID(fid));
 327         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 328                                            name, strlen(name));
 329         mutex_lock(&parent->d_inode->i_mutex);
 330         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 331                                     NULL, NULL);
 332         if (bh == NULL) {
 333                 rc = -ENOENT;
 334         } else {
 335                 rc = 0;
 336                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 337                 brelse(bh);
 338         }
 339         mutex_unlock(&parent->d_inode->i_mutex);
 340         if (rc == 0)
 341                 osd_add_oi_cache(oti, osd, id, fid);
 342         RETURN(rc);
 343 }
 344
 345 /*
 346  * directory structure on legacy OST:
 347  *
 348  * O/<seq>/d0-31/<objid>
 349  * O/<seq>/LAST_ID
 350  * last_rcvd
 351  * LAST_GROUP
 352  * CONFIGS
 353  *
 354  */
 355 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 356 {
 357         struct lvfs_run_ctxt     new;
 358         struct lvfs_run_ctxt     save;
 359         struct dentry           *rootd = osd_sb(dev)->s_root;
 360         struct dentry           *d;
 361         struct osd_thread_info  *info = osd_oti_get(env);
 362         struct inode            *inode;
 363         struct lu_fid           *fid = &info->oti_fid3;
 364         int                      rc;
 365         ENTRY;
 366
 367         OBD_ALLOC_PTR(dev->od_ost_map);
 368         if (dev->od_ost_map == NULL)
 369                 RETURN(-ENOMEM);
 370
 371         /* to get subdir count from last_rcvd */
 372         rc = osd_last_rcvd_subdir_count(dev);
 373         if (rc < 0)
 374                 GOTO(cleanup_alloc, rc);
 375
 376         dev->od_ost_map->om_subdir_count = rc;
 377         rc = 0;
 378
 379         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 380         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 381         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 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_ctxt, 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_ctxt, 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         dev->od_ost_map->om_root = d;
 403
 404         /* 'What the @fid is' is not imporatant, because the object
 405          * has no OI mapping, and only is visible inside the OSD.*/
 406         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 407         rc = osd_ea_fid_set(info, inode, fid,
 408                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 409         if (rc)
 410                 GOTO(cleanup_dentry, rc);
 411
 412         pop_ctxt(&save, &new);
 413         RETURN(0);
 414
 415 cleanup_dentry:
 416         dput(d);
 417 cleanup_ctxt:
 418         pop_ctxt(&save, &new);
 419 cleanup_alloc:
 420         OBD_FREE_PTR(dev->od_ost_map);
 421         return rc;
 422 }
 423
 424 static void osd_seq_free(struct osd_obj_map *map,
 425                          struct osd_obj_seq *osd_seq)
 426 {
 427         int j;
 428
 429         list_del_init(&osd_seq->oos_seq_list);
 430
 431         if (osd_seq->oos_dirs) {
 432                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 433                         if (osd_seq->oos_dirs[j])
 434                                 dput(osd_seq->oos_dirs[j]);
 435                 }
 436                 OBD_FREE(osd_seq->oos_dirs,
 437                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 438         }
 439
 440         if (osd_seq->oos_root)
 441                 dput(osd_seq->oos_root);
 442
 443         OBD_FREE_PTR(osd_seq);
 444 }
 445
 446 static void osd_ost_fini(struct osd_device *osd)
 447 {
 448         struct osd_obj_seq    *osd_seq;
 449         struct osd_obj_seq    *tmp;
 450         struct osd_obj_map    *map = osd->od_ost_map;
 451         ENTRY;
 452
 453         if (map == NULL)
 454                 return;
 455
 456         write_lock(&map->om_seq_list_lock);
 457         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 458                                  oos_seq_list) {
 459                 osd_seq_free(map, osd_seq);
 460         }
 461         write_unlock(&map->om_seq_list_lock);
 462         if (map->om_root)
 463                 dput(map->om_root);
 464         OBD_FREE_PTR(map);
 465         osd->od_ost_map = NULL;
 466         EXIT;
 467 }
 468
 469 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 470 {
 471         int rc;
 472         ENTRY;
 473
 474         /* prepare structures for OST */
 475         rc = osd_ost_init(env, dev);
 476         if (rc)
 477                 RETURN(rc);
 478
 479         /* prepare structures for MDS */
 480         rc = osd_mdt_init(env, dev);
 481         if (rc)
 482                 osd_ost_fini(dev);
 483
 484         RETURN(rc);
 485 }
 486
 487 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 488 {
 489         struct osd_obj_seq *osd_seq;
 490
 491         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 492                 if (osd_seq->oos_seq == seq)
 493                         return osd_seq;
 494         }
 495         return NULL;
 496 }
 497
 498 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 499 {
 500         struct osd_obj_seq *osd_seq;
 501
 502         read_lock(&map->om_seq_list_lock);
 503         osd_seq = osd_seq_find_locked(map, seq);
 504         read_unlock(&map->om_seq_list_lock);
 505         return osd_seq;
 506 }
 507
 508 void osd_obj_map_fini(struct osd_device *dev)
 509 {
 510         osd_ost_fini(dev);
 511         osd_mdt_fini(dev);
 512 }
 513
 514 /**
 515  * Update the specified OI mapping.
 516  *
 517  * \retval   1, changed nothing
 518  * \retval   0, changed successfully
 519  * \retval -ve, on error
 520  */
 521 static int osd_obj_update_entry(struct osd_thread_info *info,
 522                                 struct osd_device *osd,
 523                                 struct dentry *dir, const char *name,
 524                                 const struct lu_fid *fid,
 525                                 const struct osd_inode_id *id,
 526                                 handle_t *th)
 527 {
 528         struct inode               *parent = dir->d_inode;
 529         struct dentry              *child;
 530         struct ldiskfs_dir_entry_2 *de;
 531         struct buffer_head         *bh;
 532         struct inode               *inode;
 533         struct dentry              *dentry = &info->oti_obj_dentry;
 534         struct osd_inode_id        *oi_id  = &info->oti_id3;
 535         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 536         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 537         int                         rc;
 538         ENTRY;
 539
 540         LASSERT(th != NULL);
 541         LASSERT(th->h_transaction != NULL);
 542
 543         child = &info->oti_child_dentry;
 544         child->d_parent = dir;
 545         child->d_name.hash = 0;
 546         child->d_name.name = name;
 547         child->d_name.len = strlen(name);
 548
 549         ll_vfs_dq_init(parent);
 550         mutex_lock(&parent->i_mutex);
 551         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 552         if (bh == NULL)
 553                 GOTO(out, rc = -ENOENT);
 554
 555         if (le32_to_cpu(de->inode) == id->oii_ino)
 556                 GOTO(out, rc = 1);
 557
 558         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 559         inode = osd_iget(info, osd, oi_id);
 560         if (IS_ERR(inode)) {
 561                 rc = PTR_ERR(inode);
 562                 if (rc == -ENOENT || rc == -ESTALE)
 563                         goto update;
 564                 GOTO(out, rc);
 565         }
 566
 567         /* The EA inode should NOT be in OI, old OI scrub may added
 568          * such OI mapping by wrong, replace it. */
 569         if (unlikely(osd_is_ea_inode(inode))) {
 570                 iput(inode);
 571                 goto update;
 572         }
 573
 574         rc = osd_get_lma(info, inode, dentry, lma);
 575         if (rc == -ENODATA) {
 576                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 577                 if (rc > 0 || rc == -ENODATA) {
 578                         oi_fid = NULL;
 579                         rc = 0;
 580                 }
 581         }
 582         iput(inode);
 583
 584         if (rc != 0)
 585                 GOTO(out, rc);
 586
 587         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 588          * either a crashed object or a uninitialized one. Replace it. */
 589         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
 590                 CERROR("%s: the FID "DFID" is used by two objects: "
 591                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 592                        oi_id->oii_ino, oi_id->oii_gen,
 593                        id->oii_ino, id->oii_gen);
 594                 GOTO(out, rc = -EEXIST);
 595         }
 596
 597         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
 598                 __u32 idx1 = fid_idif_ost_idx(fid);
 599                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
 600                 struct ost_id *ostid = &info->oti_ostid;
 601                 struct lu_fid *tfid = &info->oti_fid3;
 602
 603                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
 604                          "invalid given FID "DFID", not match the "
 605                          "device index %u\n", PFID(fid), osd->od_index);
 606
 607                 if (idx1 != idx2) {
 608                         if (idx1 == 0 && idx2 == osd->od_index) {
 609                                 fid_to_ostid(fid, ostid);
 610                                 ostid_to_fid(tfid, ostid, idx2);
 611                                 if (lu_fid_eq(tfid, oi_fid)) {
 612                                         CERROR("%s: the FID "DFID" is used by "
 613                                                "two objects(2): %u/%u %u/%u\n",
 614                                                osd_name(osd), PFID(fid),
 615                                                oi_id->oii_ino, oi_id->oii_gen,
 616                                                id->oii_ino, id->oii_gen);
 617
 618                                         GOTO(out, rc = -EEXIST);
 619                                 }
 620                         } else if (idx2 == 0 && idx1 == osd->od_index) {
 621                                 fid_to_ostid(oi_fid, ostid);
 622                                 ostid_to_fid(tfid, ostid, idx1);
 623                                 if (lu_fid_eq(tfid, fid)) {
 624                                         CERROR("%s: the FID "DFID" is used by "
 625                                                "two objects(2): %u/%u %u/%u\n",
 626                                                osd_name(osd), PFID(fid),
 627                                                oi_id->oii_ino, oi_id->oii_gen,
 628                                                id->oii_ino, id->oii_gen);
 629
 630                                         GOTO(out, rc = -EEXIST);
 631                                 }
 632                         }
 633                 }
 634         }
 635
 636 update:
 637         /* There may be temporary inconsistency: On one hand, the new
 638          * object may be referenced by multiple entries, which is out
 639          * of our control unless we traverse the whole /O completely,
 640          * which is non-flat order and inefficient, should be avoided;
 641          * On the other hand, the old object may become orphan if it
 642          * is still valid. Since it was referenced by an invalid entry,
 643          * making it as invisible temporary may be not worse. OI scrub
 644          * will process it later. */
 645         rc = ldiskfs_journal_get_write_access(th, bh);
 646         if (rc != 0)
 647                 GOTO(out, rc);
 648
 649         de->inode = cpu_to_le32(id->oii_ino);
 650         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 651
 652         GOTO(out, rc);
 653
 654 out:
 655         brelse(bh);
 656         mutex_unlock(&parent->i_mutex);
 657         return rc;
 658 }
 659
 660 static int osd_obj_del_entry(struct osd_thread_info *info,
 661                              struct osd_device *osd,
 662                              struct dentry *dird, char *name,
 663                              handle_t *th)
 664 {
 665         struct ldiskfs_dir_entry_2 *de;
 666         struct buffer_head         *bh;
 667         struct dentry              *child;
 668         struct inode               *dir = dird->d_inode;
 669         int                         rc;
 670         ENTRY;
 671
 672         LASSERT(th != NULL);
 673         LASSERT(th->h_transaction != NULL);
 674
 675
 676         child = &info->oti_child_dentry;
 677         child->d_name.hash = 0;
 678         child->d_name.name = name;
 679         child->d_name.len = strlen(name);
 680         child->d_parent = dird;
 681         child->d_inode = NULL;
 682
 683         ll_vfs_dq_init(dir);
 684         mutex_lock(&dir->i_mutex);
 685         rc = -ENOENT;
 686         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 687         if (bh) {
 688                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 689                 brelse(bh);
 690         }
 691         mutex_unlock(&dir->i_mutex);
 692
 693         RETURN(rc);
 694 }
 695
 696 static int osd_obj_add_entry(struct osd_thread_info *info,
 697                              struct osd_device *osd,
 698                              struct dentry *dir, char *name,
 699                              const struct osd_inode_id *id,
 700                              handle_t *th)
 701 {
 702         struct dentry *child;
 703         struct inode *inode;
 704         int rc;
 705
 706         ENTRY;
 707
 708         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 709                 RETURN(0);
 710
 711         LASSERT(th != NULL);
 712         LASSERT(th->h_transaction != NULL);
 713
 714         inode = info->oti_inode;
 715         if (unlikely(inode == NULL)) {
 716                 struct ldiskfs_inode_info *lii;
 717                 OBD_ALLOC_PTR(lii);
 718                 if (lii == NULL)
 719                         RETURN(-ENOMEM);
 720                 inode = info->oti_inode = &lii->vfs_inode;
 721         }
 722
 723         inode->i_sb = osd_sb(osd);
 724         osd_id_to_inode(inode, id);
 725         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 726
 727         child = &info->oti_child_dentry;
 728         child->d_name.hash = 0;
 729         child->d_name.name = name;
 730         child->d_name.len = strlen(name);
 731         child->d_parent = dir;
 732         child->d_inode = inode;
 733
 734         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 735                 inode->i_ino++;
 736
 737         ll_vfs_dq_init(dir->d_inode);
 738         mutex_lock(&dir->d_inode->i_mutex);
 739         rc = osd_ldiskfs_add_entry(info, th, child, inode, NULL);
 740         mutex_unlock(&dir->d_inode->i_mutex);
 741
 742         RETURN(rc);
 743 }
 744
 745 /**
 746  * Use LPU64 for legacy OST sequences, but use LPX64i for new
 747  * sequences names, so that the O/{seq}/dN/{oid} more closely
 748  * follows the DFID/PFID format. This makes it easier to map from
 749  * debug messages to objects in the future, and the legacy space
 750  * of FID_SEQ_OST_MDT0 will be unused in the future.
 751  **/
 752 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 753 {
 754         snprintf(seq_name, name_size,
 755                  (fid_seq_is_rsvd(seq) ||
 756                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
 757                  fid_seq_is_idif(seq) ? 0 : seq);
 758 }
 759
 760 static inline void osd_oid_name(char *name, size_t name_size,
 761                                 const struct lu_fid *fid, u64 id)
 762 {
 763         snprintf(name, name_size,
 764                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 765                   fid_seq_is_mdt0(fid_seq(fid)) ||
 766                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 767 }
 768
 769 /* external locking is required */
 770 static int osd_seq_load_locked(struct osd_thread_info *info,
 771                                struct osd_device *osd,
 772                                struct osd_obj_seq *osd_seq)
 773 {
 774         struct osd_obj_map  *map = osd->od_ost_map;
 775         struct dentry       *seq_dir;
 776         struct inode        *inode;
 777         struct lu_fid       *fid = &info->oti_fid3;
 778         int                 rc = 0;
 779         int                 i;
 780         char                dir_name[32];
 781         ENTRY;
 782
 783         if (osd_seq->oos_root != NULL)
 784                 RETURN(0);
 785
 786         LASSERT(map);
 787         LASSERT(map->om_root);
 788
 789         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 790
 791         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 792         if (IS_ERR(seq_dir))
 793                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 794         else if (seq_dir->d_inode == NULL)
 795                 GOTO(out_put, rc = -EFAULT);
 796
 797         inode = seq_dir->d_inode;
 798         osd_seq->oos_root = seq_dir;
 799
 800         /* 'What the @fid is' is not imporatant, because the object
 801          * has no OI mapping, and only is visible inside the OSD.*/
 802         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 803         rc = osd_ea_fid_set(info, inode, fid,
 804                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 805         if (rc != 0)
 806                 GOTO(out_put, rc);
 807
 808         LASSERT(osd_seq->oos_dirs == NULL);
 809         OBD_ALLOC(osd_seq->oos_dirs,
 810                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 811         if (osd_seq->oos_dirs == NULL)
 812                 GOTO(out_put, rc = -ENOMEM);
 813
 814         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 815                 struct dentry   *dir;
 816
 817                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 818                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 819                                    0700, 1);
 820                 if (IS_ERR(dir)) {
 821                         GOTO(out_free, rc = PTR_ERR(dir));
 822                 } else if (dir->d_inode == NULL) {
 823                         dput(dir);
 824                         GOTO(out_free, rc = -EFAULT);
 825                 }
 826
 827                 inode = dir->d_inode;
 828                 osd_seq->oos_dirs[i] = dir;
 829
 830                 /* 'What the @fid is' is not imporatant, because the object
 831                  * has no OI mapping, and only is visible inside the OSD.*/
 832                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 833                 rc = osd_ea_fid_set(info, inode, fid,
 834                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 835                 if (rc != 0)
 836                         GOTO(out_free, rc);
 837         }
 838
 839         if (rc != 0) {
 840 out_free:
 841                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 842                         if (osd_seq->oos_dirs[i] != NULL)
 843                                 dput(osd_seq->oos_dirs[i]);
 844                 }
 845                 OBD_FREE(osd_seq->oos_dirs,
 846                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 847 out_put:
 848                 dput(seq_dir);
 849                 osd_seq->oos_root = NULL;
 850         }
 851 out_err:
 852         RETURN(rc);
 853 }
 854
 855 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 856                                         struct osd_device *osd, u64 seq)
 857 {
 858         struct osd_obj_map      *map;
 859         struct osd_obj_seq      *osd_seq;
 860         int                     rc = 0;
 861         ENTRY;
 862
 863         map = osd->od_ost_map;
 864         LASSERT(map);
 865         LASSERT(map->om_root);
 866
 867         osd_seq = osd_seq_find(map, seq);
 868         if (likely(osd_seq != NULL))
 869                 RETURN(osd_seq);
 870
 871         /* Serializing init process */
 872         mutex_lock(&map->om_dir_init_mutex);
 873
 874         /* Check whether the seq has been added */
 875         read_lock(&map->om_seq_list_lock);
 876         osd_seq = osd_seq_find_locked(map, seq);
 877         if (osd_seq != NULL) {
 878                 read_unlock(&map->om_seq_list_lock);
 879                 GOTO(cleanup, rc = 0);
 880         }
 881         read_unlock(&map->om_seq_list_lock);
 882
 883         OBD_ALLOC_PTR(osd_seq);
 884         if (osd_seq == NULL)
 885                 GOTO(cleanup, rc = -ENOMEM);
 886
 887         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 888         osd_seq->oos_seq = seq;
 889         /* Init subdir count to be 32, but each seq can have
 890          * different subdir count */
 891         osd_seq->oos_subdir_count = map->om_subdir_count;
 892         rc = osd_seq_load_locked(info, osd, osd_seq);
 893         if (rc != 0)
 894                 GOTO(cleanup, rc);
 895
 896         write_lock(&map->om_seq_list_lock);
 897         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 898         write_unlock(&map->om_seq_list_lock);
 899
 900 cleanup:
 901         mutex_unlock(&map->om_dir_init_mutex);
 902         if (rc != 0) {
 903                 if (osd_seq != NULL)
 904                         OBD_FREE_PTR(osd_seq);
 905                 RETURN(ERR_PTR(rc));
 906         }
 907
 908         RETURN(osd_seq);
 909 }
 910
 911 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 912                        const struct lu_fid *fid, struct osd_inode_id *id)
 913 {
 914         struct osd_obj_map              *map;
 915         struct osd_obj_seq              *osd_seq;
 916         struct dentry                   *d_seq;
 917         struct dentry                   *child;
 918         struct ost_id                   *ostid = &info->oti_ostid;
 919         int                             dirn;
 920         char                            name[32];
 921         struct ldiskfs_dir_entry_2      *de;
 922         struct buffer_head              *bh;
 923         struct inode                    *dir;
 924         struct inode                    *inode;
 925         ENTRY;
 926
 927         /* on the very first lookup we find and open directories */
 928
 929         map = dev->od_ost_map;
 930         LASSERT(map);
 931         LASSERT(map->om_root);
 932
 933         fid_to_ostid(fid, ostid);
 934         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 935         if (IS_ERR(osd_seq))
 936                 RETURN(PTR_ERR(osd_seq));
 937
 938         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 939         d_seq = osd_seq->oos_dirs[dirn];
 940         LASSERT(d_seq);
 941
 942         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 943
 944         child = &info->oti_child_dentry;
 945         child->d_parent = d_seq;
 946         child->d_name.hash = 0;
 947         child->d_name.name = name;
 948         /* XXX: we can use rc from sprintf() instead of strlen() */
 949         child->d_name.len = strlen(name);
 950
 951         dir = d_seq->d_inode;
 952         mutex_lock(&dir->i_mutex);
 953         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 954         mutex_unlock(&dir->i_mutex);
 955
 956         if (bh == NULL)
 957                 RETURN(-ENOENT);
 958
 959         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 960         brelse(bh);
 961
 962         inode = osd_iget(info, dev, id);
 963         if (IS_ERR(inode)) {
 964                 int rc = PTR_ERR(inode);
 965
 966                 RETURN(rc == -ENOENT ? -ESTALE : rc);
 967         }
 968
 969         iput(inode);
 970         RETURN(0);
 971 }
 972
 973 int osd_obj_map_insert(struct osd_thread_info *info,
 974                        struct osd_device *osd,
 975                        const struct lu_fid *fid,
 976                        const struct osd_inode_id *id,
 977                        handle_t *th)
 978 {
 979         struct osd_obj_map      *map;
 980         struct osd_obj_seq      *osd_seq;
 981         struct dentry           *d;
 982         struct ost_id           *ostid = &info->oti_ostid;
 983         u64                      oid;
 984         int                     dirn, rc = 0;
 985         char                    name[32];
 986         ENTRY;
 987
 988         map = osd->od_ost_map;
 989         LASSERT(map);
 990
 991         /* map fid to seq:objid */
 992         fid_to_ostid(fid, ostid);
 993
 994         oid = ostid_id(ostid);
 995         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
 996         if (IS_ERR(osd_seq))
 997                 RETURN(PTR_ERR(osd_seq));
 998
 999         dirn = oid & (osd_seq->oos_subdir_count - 1);
1000         d = osd_seq->oos_dirs[dirn];
1001         LASSERT(d);
1002
1003         osd_oid_name(name, sizeof(name), fid, oid);
1004
1005 again:
1006         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1007         if (rc == -EEXIST) {
1008                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1009                 if (unlikely(rc == -ENOENT))
1010                         goto again;
1011
1012                 if (unlikely(rc == 1))
1013                         RETURN(0);
1014         }
1015
1016         RETURN(rc);
1017 }
1018
1019 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1020                        const struct lu_fid *fid, handle_t *th)
1021 {
1022         struct osd_obj_map      *map;
1023         struct osd_obj_seq      *osd_seq;
1024         struct dentry           *d;
1025         struct ost_id           *ostid = &info->oti_ostid;
1026         int                     dirn, rc = 0;
1027         char                    name[32];
1028         ENTRY;
1029
1030         map = osd->od_ost_map;
1031         LASSERT(map);
1032
1033         /* map fid to seq:objid */
1034         fid_to_ostid(fid, ostid);
1035
1036         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1037         if (IS_ERR(osd_seq))
1038                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1039
1040         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1041         d = osd_seq->oos_dirs[dirn];
1042         LASSERT(d);
1043
1044         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1045         rc = osd_obj_del_entry(info, osd, d, name, th);
1046 cleanup:
1047         RETURN(rc);
1048 }
1049
1050 int osd_obj_map_update(struct osd_thread_info *info,
1051                        struct osd_device *osd,
1052                        const struct lu_fid *fid,
1053                        const struct osd_inode_id *id,
1054                        handle_t *th)
1055 {
1056         struct osd_obj_seq      *osd_seq;
1057         struct dentry           *d;
1058         struct ost_id           *ostid = &info->oti_ostid;
1059         int                     dirn, rc = 0;
1060         char                    name[32];
1061         ENTRY;
1062
1063         fid_to_ostid(fid, ostid);
1064         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1065         if (IS_ERR(osd_seq))
1066                 RETURN(PTR_ERR(osd_seq));
1067
1068         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1069         d = osd_seq->oos_dirs[dirn];
1070         LASSERT(d);
1071
1072         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1073         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1074
1075         RETURN(rc);
1076 }
1077
1078 int osd_obj_map_recover(struct osd_thread_info *info,
1079                         struct osd_device *osd,
1080                         struct inode *src_parent,
1081                         struct dentry *src_child,
1082                         const struct lu_fid *fid)
1083 {
1084         struct osd_obj_seq         *osd_seq;
1085         struct dentry              *tgt_parent;
1086         struct dentry              *tgt_child = &info->oti_child_dentry;
1087         struct inode               *dir;
1088         struct inode               *inode     = src_child->d_inode;
1089         struct ost_id              *ostid     = &info->oti_ostid;
1090         handle_t                   *jh;
1091         struct ldiskfs_dir_entry_2 *de;
1092         struct buffer_head         *bh;
1093         char                        name[32];
1094         int                         dirn;
1095         int                         rc        = 0;
1096         ENTRY;
1097
1098         if (fid_is_last_id(fid)) {
1099                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1100                 if (IS_ERR(osd_seq))
1101                         RETURN(PTR_ERR(osd_seq));
1102
1103                 tgt_parent = osd_seq->oos_root;
1104                 tgt_child->d_name.name = "LAST_ID";
1105                 tgt_child->d_name.len = strlen("LAST_ID");
1106         } else {
1107                 fid_to_ostid(fid, ostid);
1108                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1109                 if (IS_ERR(osd_seq))
1110                         RETURN(PTR_ERR(osd_seq));
1111
1112                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1113                 tgt_parent = osd_seq->oos_dirs[dirn];
1114                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1115                 tgt_child->d_name.name = name;
1116                 tgt_child->d_name.len = strlen(name);
1117         }
1118         LASSERT(tgt_parent != NULL);
1119
1120         dir = tgt_parent->d_inode;
1121         tgt_child->d_name.hash = 0;
1122         tgt_child->d_parent = tgt_parent;
1123         tgt_child->d_inode = inode;
1124
1125         /* The non-initialized src_child may be destroyed. */
1126         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1127                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1128                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1129                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1130         if (IS_ERR(jh))
1131                 RETURN(PTR_ERR(jh));
1132
1133         ll_vfs_dq_init(src_parent);
1134         ll_vfs_dq_init(dir);
1135
1136         mutex_lock(&src_parent->i_mutex);
1137         mutex_lock(&dir->i_mutex);
1138         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1139         if (bh != NULL) {
1140                 /* XXX: If some other object occupied the same slot. And If such
1141                  *      inode is zero-sized and with SUID+SGID, then means it is
1142                  *      a new created one. Maybe we can remove it and insert the
1143                  *      original one back to the /O/<seq>/d<x>. But there are
1144                  *      something to be considered:
1145                  *
1146                  *      1) The OST-object under /lost+found has crashed LMA.
1147                  *         So it should not conflict with the current one.
1148                  *
1149                  *      2) There are race conditions that: someone may just want
1150                  *         to modify the current one. Even if the OI scrub takes
1151                  *         the object lock when remove the current one, it still
1152                  *         cause the modification to be lost becasue the target
1153                  *         has been removed when the RPC service thread waiting
1154                  *         for the lock.
1155                  *
1156                  *      So keep it there before we have suitable solution. */
1157                 brelse(bh);
1158                 mutex_unlock(&dir->i_mutex);
1159                 mutex_unlock(&src_parent->i_mutex);
1160                 ldiskfs_journal_stop(jh);
1161
1162                 rc = -EEXIST;
1163                 /* If the src object has never been modified, then remove it. */
1164                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1165                     inode->i_mode & S_ISGID) {
1166                         rc = ll_vfs_unlink(src_parent, src_child);
1167                         if (unlikely(rc == -ENOENT))
1168                                 rc = 0;
1169                 }
1170                 RETURN(rc);
1171         }
1172
1173         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1174                                     NULL, NULL);
1175         if (unlikely(bh == NULL))
1176                 GOTO(unlock, rc = -ENOENT);
1177
1178         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1179         brelse(bh);
1180         if (rc != 0)
1181                 GOTO(unlock, rc);
1182
1183         rc = osd_ldiskfs_add_entry(info, jh, tgt_child, inode, NULL);
1184
1185         GOTO(unlock, rc);
1186
1187 unlock:
1188         mutex_unlock(&dir->i_mutex);
1189         mutex_unlock(&src_parent->i_mutex);
1190         ldiskfs_journal_stop(jh);
1191         return rc;
1192 }
1193
1194 static struct dentry *
1195 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1196                      const struct lu_fid *fid, char **name)
1197 {
1198         struct dentry *root = ERR_PTR(-ENOENT);
1199
1200         if (fid_is_last_id(fid)) {
1201                 struct osd_obj_seq *osd_seq;
1202
1203                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1204                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1205                 if (IS_ERR(osd_seq))
1206                         RETURN((struct dentry *)osd_seq);
1207
1208                 *name = "LAST_ID";
1209                 root = osd_seq->oos_root;
1210         } else {
1211                 *name = osd_lf_fid2name(fid);
1212                 if (*name == NULL)
1213                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1214                 else if ((*name)[0])
1215                         root = osd_sb(osd)->s_root;
1216         }
1217
1218         return root;
1219 }
1220
1221 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1222                         const struct lu_fid *fid, const struct osd_inode_id *id,
1223                         handle_t *th)
1224 {
1225         struct dentry   *root;
1226         char            *name = NULL;
1227         int              rc;
1228         ENTRY;
1229
1230         root = osd_object_spec_find(info, osd, fid, &name);
1231         if (!IS_ERR(root)) {
1232                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1233         } else {
1234                 rc = PTR_ERR(root);
1235                 if (rc == -ENOENT)
1236                         rc = 1;
1237         }
1238
1239         RETURN(rc);
1240 }
1241
1242 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1243                         const struct lu_fid *fid, const struct osd_inode_id *id,
1244                         handle_t *th)
1245 {
1246         struct dentry   *root;
1247         char            *name = NULL;
1248         int              rc;
1249         ENTRY;
1250
1251         root = osd_object_spec_find(info, osd, fid, &name);
1252         if (!IS_ERR(root)) {
1253                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1254         } else {
1255                 rc = PTR_ERR(root);
1256                 if (rc == -ENOENT)
1257                         rc = 0;
1258         }
1259
1260         RETURN(rc);
1261 }
1262
1263 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1264                         const struct lu_fid *fid, struct osd_inode_id *id)
1265 {
1266         struct dentry   *root;
1267         struct dentry   *dentry;
1268         struct inode    *inode;
1269         char            *name = NULL;
1270         int             rc = -ENOENT;
1271         ENTRY;
1272
1273         if (fid_is_last_id(fid)) {
1274                 struct osd_obj_seq *osd_seq;
1275
1276                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1277                 if (IS_ERR(osd_seq))
1278                         RETURN(PTR_ERR(osd_seq));
1279                 root = osd_seq->oos_root;
1280                 name = "LAST_ID";
1281         } else {
1282                 root = osd_sb(osd)->s_root;
1283                 name = osd_lf_fid2name(fid);
1284                 if (name == NULL || strlen(name) == 0)
1285                         RETURN(-ENOENT);
1286         }
1287
1288         dentry = ll_lookup_one_len(name, root, strlen(name));
1289         if (!IS_ERR(dentry)) {
1290                 inode = dentry->d_inode;
1291                 if (inode) {
1292                         if (is_bad_inode(inode)) {
1293                                 rc = -EIO;
1294                         } else {
1295                                 osd_id_gen(id, inode->i_ino,
1296                                            inode->i_generation);
1297                                 rc = 0;
1298                         }
1299                 }
1300                 /* if dentry is accessible after osd_compat_spec_insert it
1301                  * will still contain NULL inode, so don't keep it in cache */
1302                 d_invalidate(dentry);
1303                 dput(dentry);
1304         }
1305
1306         RETURN(rc);
1307 }