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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/osd/osd_compat.c
  33  *
  34  * on-disk structure for managing /O
  35  *
  36  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  37  */
  38
  39 /* prerequisite for linux/xattr.h */
  40 #include <linux/types.h>
  41 /* prerequisite for linux/xattr.h */
  42 #include <linux/fs.h>
  43 /* XATTR_{REPLACE,CREATE} */
  44 #include <linux/xattr.h>
  45
  46 /*
  47  * struct OBD_{ALLOC,FREE}*()
  48  * OBD_FAIL_CHECK
  49  */
  50 #include <obd_support.h>
  51
  52 #include "osd_internal.h"
  53 #include "osd_oi.h"
  54
  55 static void osd_push_ctxt(const struct osd_device *dev,
  56                           struct lvfs_run_ctxt *newctxt,
  57                           struct lvfs_run_ctxt *save)
  58 {
  59         OBD_SET_CTXT_MAGIC(newctxt);
  60         newctxt->pwdmnt = dev->od_mnt;
  61         newctxt->pwd = dev->od_mnt->mnt_root;
  62         newctxt->fs = get_ds();
  63         newctxt->umask = current_umask();
  64         newctxt->dt = NULL;
  65
  66         push_ctxt(save, newctxt);
  67 }
  68
  69 /* utility to make a directory */
  70 static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
  71                                    const char *name, int mode, int fix)
  72 {
  73         struct dentry *dchild;
  74         int err = 0;
  75         ENTRY;
  76
  77         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  78         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  79         dchild = ll_lookup_one_len(name, dir, strlen(name));
  80         if (IS_ERR(dchild))
  81                 GOTO(out_up, dchild);
  82
  83         if (dchild->d_inode) {
  84                 int old_mode = dchild->d_inode->i_mode;
  85                 if (!S_ISDIR(old_mode)) {
  86                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  87                                dchild->d_inode->i_ino,
  88                                dchild->d_inode->i_generation, old_mode);
  89                         GOTO(out_err, err = -ENOTDIR);
  90                 }
  91
  92                 /* Fixup directory permissions if necessary */
  93                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
  94                         CDEBUG(D_CONFIG,
  95                                "fixing permissions on %s from %o to %o\n",
  96                                name, old_mode, mode);
  97                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
  98                                                   (old_mode & ~S_IALLUGO);
  99                         mark_inode_dirty(dchild->d_inode);
 100                 }
 101                 GOTO(out_up, dchild);
 102         }
 103
 104         err = vfs_mkdir(dir->d_inode, dchild, mode);
 105         if (err)
 106                 GOTO(out_err, err);
 107
 108         RETURN(dchild);
 109
 110 out_err:
 111         dput(dchild);
 112         dchild = ERR_PTR(err);
 113 out_up:
 114         return dchild;
 115 }
 116
 117 static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 118 {
 119         struct lr_server_data lsd;
 120         struct dentry        *dlast;
 121         loff_t                off;
 122         int                   rc = 0;
 123         int                   count = OBJ_SUBDIR_COUNT;
 124
 125         ENTRY;
 126
 127         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 128                                   strlen(LAST_RCVD));
 129         if (IS_ERR(dlast))
 130                 return PTR_ERR(dlast);
 131         else if (dlast->d_inode == NULL)
 132                 goto out;
 133
 134         off = 0;
 135         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 136         if (rc == sizeof(lsd)) {
 137                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 138                        "subdir count = %d\n", lsd.lsd_uuid,
 139                        lsd.lsd_subdir_count);
 140                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 141                         count = le16_to_cpu(lsd.lsd_subdir_count);
 142         } else if (rc != 0) {
 143                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 144                 if (rc > 0)
 145                         rc = -EFAULT;
 146                 dput(dlast);
 147                 return rc;
 148         }
 149 out:
 150         dput(dlast);
 151         LASSERT(count > 0);
 152         return count;
 153 }
 154
 155 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 156 {
 157         struct lvfs_run_ctxt    new;
 158         struct lvfs_run_ctxt    save;
 159         struct dentry           *parent;
 160         struct osd_mdobj_map    *omm;
 161         struct dentry           *d;
 162         struct osd_thread_info  *info = osd_oti_get(env);
 163         struct lu_fid           *fid = &info->oti_fid3;
 164         int                     rc = 0;
 165         ENTRY;
 166
 167         OBD_ALLOC_PTR(dev->od_mdt_map);
 168         if (dev->od_mdt_map == NULL)
 169                 RETURN(-ENOMEM);
 170
 171         omm = dev->od_mdt_map;
 172
 173         parent = osd_sb(dev)->s_root;
 174         osd_push_ctxt(dev, &new, &save);
 175
 176         d = simple_mkdir(parent, dev->od_mnt, REMOTE_PARENT_DIR,
 177                          0755, 1);
 178         if (IS_ERR(d))
 179                 GOTO(cleanup, rc = PTR_ERR(d));
 180
 181         omm->omm_remote_parent = d;
 182
 183         /* Set LMA for remote parent inode */
 184         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 185         rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
 186
 187         GOTO(cleanup, rc);
 188
 189 cleanup:
 190         pop_ctxt(&save, &new);
 191         if (rc) {
 192                 if (omm->omm_remote_parent != NULL)
 193                         dput(omm->omm_remote_parent);
 194                 OBD_FREE_PTR(omm);
 195                 dev->od_mdt_map = NULL;
 196         }
 197         return rc;
 198 }
 199
 200 static void osd_mdt_fini(struct osd_device *osd)
 201 {
 202         struct osd_mdobj_map *omm = osd->od_mdt_map;
 203
 204         if (omm == NULL)
 205                 return;
 206
 207         if (omm->omm_remote_parent)
 208                 dput(omm->omm_remote_parent);
 209
 210         OBD_FREE_PTR(omm);
 211         osd->od_ost_map = NULL;
 212 }
 213
 214 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 215                              struct osd_object *obj, struct osd_thandle *oh)
 216 {
 217         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 218         struct osd_thread_info  *oti = osd_oti_get(env);
 219         struct lustre_mdt_attrs *lma = &oti->oti_ost_attrs.loa_lma;
 220         char                    *name = oti->oti_name;
 221         struct osd_thread_info  *info = osd_oti_get(env);
 222         struct dentry           *dentry;
 223         struct dentry           *parent;
 224         int                     rc;
 225
 226         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_AGENTENT))
 227                 RETURN(0);
 228
 229         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 230          * can identify this object quickly */
 231         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 232                          &oti->oti_ost_attrs);
 233         if (rc)
 234                 RETURN(rc);
 235
 236         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 237         lustre_lma_swab(lma);
 238         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 239                              sizeof(*lma), XATTR_REPLACE);
 240         if (rc)
 241                 RETURN(rc);
 242
 243         parent = omm->omm_remote_parent;
 244         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 245         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 246                                            name, strlen(name));
 247         mutex_lock(&parent->d_inode->i_mutex);
 248         rc = osd_ldiskfs_add_entry(info, osd, oh->ot_handle, dentry,
 249                                    obj->oo_inode, NULL);
 250         if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 251                 ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 252         else if (unlikely(rc == -EEXIST))
 253                 rc = 0;
 254         if (!rc)
 255                 lu_object_set_agent_entry(&obj->oo_dt.do_lu);
 256         CDEBUG(D_INODE, "%s: create agent entry for %s: rc = %d\n",
 257                osd_name(osd), name, rc);
 258         mark_inode_dirty(parent->d_inode);
 259         mutex_unlock(&parent->d_inode->i_mutex);
 260         RETURN(rc);
 261 }
 262
 263 int osd_delete_from_remote_parent(const struct lu_env *env,
 264                                   struct osd_device *osd,
 265                                   struct osd_object *obj,
 266                                   struct osd_thandle *oh, bool destroy)
 267 {
 268         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 269         struct osd_thread_info     *oti = osd_oti_get(env);
 270         struct lustre_mdt_attrs    *lma = &oti->oti_ost_attrs.loa_lma;
 271         char                       *name = oti->oti_name;
 272         struct dentry              *dentry;
 273         struct dentry              *parent;
 274         struct ldiskfs_dir_entry_2 *de;
 275         struct buffer_head         *bh;
 276         int                        rc;
 277
 278         parent = omm->omm_remote_parent;
 279         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 280         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 281                                            name, strlen(name));
 282         mutex_lock(&parent->d_inode->i_mutex);
 283         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 284                                     NULL, NULL);
 285         if (IS_ERR(bh)) {
 286                 mutex_unlock(&parent->d_inode->i_mutex);
 287                 rc = PTR_ERR(bh);
 288                 if (unlikely(rc == -ENOENT))
 289                         rc = 0;
 290         } else {
 291                 rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode,
 292                                           de, bh);
 293                 if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 294                         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 295                 mark_inode_dirty(parent->d_inode);
 296                 mutex_unlock(&parent->d_inode->i_mutex);
 297                 brelse(bh);
 298                 CDEBUG(D_INODE, "%s: remove agent entry for %s: rc = %d\n",
 299                        osd_name(osd), name, rc);
 300         }
 301
 302         if (destroy || rc) {
 303                 if (!rc)
 304                         lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 305
 306                 RETURN(rc);
 307         }
 308
 309         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 310                          &oti->oti_ost_attrs);
 311         if (rc)
 312                 RETURN(rc);
 313
 314         /* Get rid of REMOTE_PARENT flag from incompat */
 315         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 316         lustre_lma_swab(lma);
 317         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 318                              sizeof(*lma), XATTR_REPLACE);
 319         if (!rc)
 320                 lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 321         RETURN(rc);
 322 }
 323
 324 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 325                                 struct osd_device *osd,
 326                                 const struct lu_fid *fid,
 327                                 struct osd_inode_id *id)
 328 {
 329         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 330         char                        *name = oti->oti_name;
 331         struct dentry               *parent;
 332         struct dentry               *dentry;
 333         struct ldiskfs_dir_entry_2 *de;
 334         struct buffer_head         *bh;
 335         int                         rc;
 336         ENTRY;
 337
 338         parent = omm->omm_remote_parent;
 339         sprintf(name, DFID_NOBRACE, PFID(fid));
 340         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 341                                            name, strlen(name));
 342         mutex_lock(&parent->d_inode->i_mutex);
 343         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 344                                     NULL, NULL);
 345         if (IS_ERR(bh)) {
 346                 rc = PTR_ERR(bh);
 347         } else {
 348                 struct inode *inode;
 349
 350                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 351                 brelse(bh);
 352                 inode = osd_iget(oti, osd, id);
 353                 if (IS_ERR(inode)) {
 354                         rc = PTR_ERR(inode);
 355                         if (rc == -ESTALE)
 356                                 rc = -ENOENT;
 357                 } else {
 358                         iput(inode);
 359                         rc = 0;
 360                 }
 361         }
 362         mutex_unlock(&parent->d_inode->i_mutex);
 363         if (rc == 0)
 364                 osd_add_oi_cache(oti, osd, id, fid);
 365         RETURN(rc);
 366 }
 367
 368 /*
 369  * directory structure on legacy OST:
 370  *
 371  * O/<seq>/d0-31/<objid>
 372  * O/<seq>/LAST_ID
 373  * last_rcvd
 374  * LAST_GROUP
 375  * CONFIGS
 376  *
 377  */
 378 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 379 {
 380         struct lvfs_run_ctxt     new;
 381         struct lvfs_run_ctxt     save;
 382         struct dentry           *rootd = osd_sb(dev)->s_root;
 383         struct dentry           *d;
 384         struct osd_thread_info  *info = osd_oti_get(env);
 385         struct inode            *inode;
 386         struct lu_fid           *fid = &info->oti_fid3;
 387         int                      rc;
 388         ENTRY;
 389
 390         OBD_ALLOC_PTR(dev->od_ost_map);
 391         if (dev->od_ost_map == NULL)
 392                 RETURN(-ENOMEM);
 393
 394         /* to get subdir count from last_rcvd */
 395         rc = osd_last_rcvd_subdir_count(dev);
 396         if (rc < 0)
 397                 GOTO(cleanup_alloc, rc);
 398
 399         dev->od_ost_map->om_subdir_count = rc;
 400         rc = 0;
 401
 402         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 403         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 404         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 405
 406         osd_push_ctxt(dev, &new, &save);
 407
 408         d = ll_lookup_one_len("O", rootd, strlen("O"));
 409         if (IS_ERR(d))
 410                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 411         if (d->d_inode == NULL) {
 412                 dput(d);
 413                 /* The lookup() may be called again inside simple_mkdir().
 414                  * Since the repeated lookup() only be called for "/O" at
 415                  * mount time, it will not affect the whole performance. */
 416                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
 417                 if (IS_ERR(d))
 418                         GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 419
 420                 /* It is quite probably that the device is new formatted. */
 421                 dev->od_maybe_new = 1;
 422         }
 423
 424         inode = d->d_inode;
 425         dev->od_ost_map->om_root = d;
 426
 427         /* 'What the @fid is' is not imporatant, because the object
 428          * has no OI mapping, and only is visible inside the OSD.*/
 429         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 430         rc = osd_ea_fid_set(info, inode, fid,
 431                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 432         if (rc)
 433                 GOTO(cleanup_dentry, rc);
 434
 435         pop_ctxt(&save, &new);
 436         RETURN(0);
 437
 438 cleanup_dentry:
 439         dput(d);
 440 cleanup_ctxt:
 441         pop_ctxt(&save, &new);
 442 cleanup_alloc:
 443         OBD_FREE_PTR(dev->od_ost_map);
 444         return rc;
 445 }
 446
 447 static void osd_seq_free(struct osd_obj_seq *osd_seq)
 448 {
 449         int j;
 450
 451         if (osd_seq->oos_dirs) {
 452                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 453                         if (osd_seq->oos_dirs[j])
 454                                 dput(osd_seq->oos_dirs[j]);
 455                 }
 456                 OBD_FREE(osd_seq->oos_dirs,
 457                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 458         }
 459
 460         if (osd_seq->oos_root)
 461                 dput(osd_seq->oos_root);
 462
 463         OBD_FREE_PTR(osd_seq);
 464 }
 465
 466 static void osd_ost_fini(struct osd_device *osd)
 467 {
 468         struct osd_obj_seq    *osd_seq;
 469         struct osd_obj_seq    *tmp;
 470         struct osd_obj_map    *map = osd->od_ost_map;
 471         ENTRY;
 472
 473         if (map == NULL)
 474                 return;
 475
 476         write_lock(&map->om_seq_list_lock);
 477         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 478                                  oos_seq_list) {
 479                 list_del_init(&osd_seq->oos_seq_list);
 480                 write_unlock(&map->om_seq_list_lock);
 481                 osd_seq_free(osd_seq);
 482                 write_lock(&map->om_seq_list_lock);
 483         }
 484         write_unlock(&map->om_seq_list_lock);
 485         if (map->om_root)
 486                 dput(map->om_root);
 487         OBD_FREE_PTR(map);
 488         osd->od_ost_map = NULL;
 489         EXIT;
 490 }
 491
 492 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 493 {
 494         int rc;
 495         ENTRY;
 496
 497         /* prepare structures for OST */
 498         rc = osd_ost_init(env, dev);
 499         if (rc)
 500                 RETURN(rc);
 501
 502         /* prepare structures for MDS */
 503         rc = osd_mdt_init(env, dev);
 504         if (rc)
 505                 osd_ost_fini(dev);
 506
 507         RETURN(rc);
 508 }
 509
 510 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 511 {
 512         struct osd_obj_seq *osd_seq;
 513
 514         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 515                 if (osd_seq->oos_seq == seq)
 516                         return osd_seq;
 517         }
 518         return NULL;
 519 }
 520
 521 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 522 {
 523         struct osd_obj_seq *osd_seq;
 524
 525         read_lock(&map->om_seq_list_lock);
 526         osd_seq = osd_seq_find_locked(map, seq);
 527         read_unlock(&map->om_seq_list_lock);
 528         return osd_seq;
 529 }
 530
 531 void osd_obj_map_fini(struct osd_device *dev)
 532 {
 533         osd_ost_fini(dev);
 534         osd_mdt_fini(dev);
 535 }
 536
 537 /**
 538  * Update the specified OI mapping.
 539  *
 540  * \retval   1, changed nothing
 541  * \retval   0, changed successfully
 542  * \retval -ve, on error
 543  */
 544 static int osd_obj_update_entry(struct osd_thread_info *info,
 545                                 struct osd_device *osd,
 546                                 struct dentry *dir, const char *name,
 547                                 const struct lu_fid *fid,
 548                                 const struct osd_inode_id *id,
 549                                 handle_t *th)
 550 {
 551         struct inode               *parent = dir->d_inode;
 552         struct dentry              *child;
 553         struct ldiskfs_dir_entry_2 *de;
 554         struct buffer_head         *bh;
 555         struct inode               *inode;
 556         struct dentry              *dentry = &info->oti_obj_dentry;
 557         struct osd_inode_id        *oi_id  = &info->oti_id3;
 558         struct lustre_mdt_attrs    *lma    = &info->oti_ost_attrs.loa_lma;
 559         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 560         int                         rc;
 561         ENTRY;
 562
 563         LASSERT(th != NULL);
 564         LASSERT(th->h_transaction != NULL);
 565
 566         child = &info->oti_child_dentry;
 567         child->d_parent = dir;
 568         child->d_name.hash = 0;
 569         child->d_name.name = name;
 570         child->d_name.len = strlen(name);
 571
 572         ll_vfs_dq_init(parent);
 573         mutex_lock(&parent->i_mutex);
 574         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 575         if (IS_ERR(bh))
 576                 GOTO(out, rc = PTR_ERR(bh));
 577
 578         if (le32_to_cpu(de->inode) == id->oii_ino)
 579                 GOTO(out, rc = 1);
 580
 581         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 582         inode = osd_iget(info, osd, oi_id);
 583         if (IS_ERR(inode)) {
 584                 rc = PTR_ERR(inode);
 585                 if (rc == -ENOENT || rc == -ESTALE)
 586                         goto update;
 587                 GOTO(out, rc);
 588         }
 589
 590         /* The EA inode should NOT be in OI, old OI scrub may added
 591          * such OI mapping by wrong, replace it. */
 592         if (unlikely(osd_is_ea_inode(inode))) {
 593                 iput(inode);
 594                 goto update;
 595         }
 596
 597         rc = osd_get_lma(info, inode, dentry, &info->oti_ost_attrs);
 598         if (rc == -ENODATA) {
 599                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 600                 if (rc > 0 || rc == -ENODATA) {
 601                         oi_fid = NULL;
 602                         rc = 0;
 603                 }
 604         }
 605         iput(inode);
 606
 607         if (rc != 0)
 608                 GOTO(out, rc);
 609
 610         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 611          * either a crashed object or a uninitialized one. Replace it. */
 612         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
 613                 CERROR("%s: the FID "DFID" is used by two objects: "
 614                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 615                        oi_id->oii_ino, oi_id->oii_gen,
 616                        id->oii_ino, id->oii_gen);
 617                 GOTO(out, rc = -EEXIST);
 618         }
 619
 620         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
 621                 __u32 idx1 = fid_idif_ost_idx(fid);
 622                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
 623                 struct ost_id *ostid = &info->oti_ostid;
 624                 struct lu_fid *tfid = &info->oti_fid3;
 625
 626                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
 627                          "invalid given FID "DFID", not match the "
 628                          "device index %u\n", PFID(fid), osd->od_index);
 629
 630                 if (idx1 != idx2) {
 631                         if (idx1 == 0 && idx2 == osd->od_index) {
 632                                 fid_to_ostid(fid, ostid);
 633                                 ostid_to_fid(tfid, ostid, idx2);
 634                                 if (lu_fid_eq(tfid, oi_fid)) {
 635                                         CERROR("%s: the FID "DFID" is used by "
 636                                                "two objects(2): %u/%u %u/%u\n",
 637                                                osd_name(osd), PFID(fid),
 638                                                oi_id->oii_ino, oi_id->oii_gen,
 639                                                id->oii_ino, id->oii_gen);
 640
 641                                         GOTO(out, rc = -EEXIST);
 642                                 }
 643                         } else if (idx2 == 0 && idx1 == osd->od_index) {
 644                                 fid_to_ostid(oi_fid, ostid);
 645                                 ostid_to_fid(tfid, ostid, idx1);
 646                                 if (lu_fid_eq(tfid, fid)) {
 647                                         CERROR("%s: the FID "DFID" is used by "
 648                                                "two objects(2): %u/%u %u/%u\n",
 649                                                osd_name(osd), PFID(fid),
 650                                                oi_id->oii_ino, oi_id->oii_gen,
 651                                                id->oii_ino, id->oii_gen);
 652
 653                                         GOTO(out, rc = -EEXIST);
 654                                 }
 655                         }
 656                 }
 657         }
 658
 659 update:
 660         /* There may be temporary inconsistency: On one hand, the new
 661          * object may be referenced by multiple entries, which is out
 662          * of our control unless we traverse the whole /O completely,
 663          * which is non-flat order and inefficient, should be avoided;
 664          * On the other hand, the old object may become orphan if it
 665          * is still valid. Since it was referenced by an invalid entry,
 666          * making it as invisible temporary may be not worse. OI scrub
 667          * will process it later. */
 668         rc = ldiskfs_journal_get_write_access(th, bh);
 669         if (rc != 0)
 670                 GOTO(out, rc);
 671
 672         de->inode = cpu_to_le32(id->oii_ino);
 673         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 674
 675         GOTO(out, rc);
 676
 677 out:
 678         if (!IS_ERR(bh))
 679                 brelse(bh);
 680         mutex_unlock(&parent->i_mutex);
 681         return rc;
 682 }
 683
 684 static int osd_obj_del_entry(struct osd_thread_info *info,
 685                              struct osd_device *osd,
 686                              struct dentry *dird, char *name,
 687                              handle_t *th)
 688 {
 689         struct ldiskfs_dir_entry_2 *de;
 690         struct buffer_head         *bh;
 691         struct dentry              *child;
 692         struct inode               *dir = dird->d_inode;
 693         int                         rc;
 694         ENTRY;
 695
 696         LASSERT(th != NULL);
 697         LASSERT(th->h_transaction != NULL);
 698
 699
 700         child = &info->oti_child_dentry;
 701         child->d_name.hash = 0;
 702         child->d_name.name = name;
 703         child->d_name.len = strlen(name);
 704         child->d_parent = dird;
 705         child->d_inode = NULL;
 706
 707         ll_vfs_dq_init(dir);
 708         mutex_lock(&dir->i_mutex);
 709         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 710         if (IS_ERR(bh)) {
 711                 rc = PTR_ERR(bh);
 712         } else {
 713                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 714                 brelse(bh);
 715         }
 716         mutex_unlock(&dir->i_mutex);
 717
 718         RETURN(rc);
 719 }
 720
 721 static int osd_obj_add_entry(struct osd_thread_info *info,
 722                              struct osd_device *osd,
 723                              struct dentry *dir, char *name,
 724                              const struct osd_inode_id *id,
 725                              handle_t *th)
 726 {
 727         struct dentry *child;
 728         struct inode *inode;
 729         int rc;
 730
 731         ENTRY;
 732
 733         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 734                 RETURN(0);
 735
 736         LASSERT(th != NULL);
 737         LASSERT(th->h_transaction != NULL);
 738
 739         inode = info->oti_inode;
 740         if (unlikely(inode == NULL)) {
 741                 struct ldiskfs_inode_info *lii;
 742                 OBD_ALLOC_PTR(lii);
 743                 if (lii == NULL)
 744                         RETURN(-ENOMEM);
 745                 inode = info->oti_inode = &lii->vfs_inode;
 746         }
 747
 748         inode->i_sb = osd_sb(osd);
 749         osd_id_to_inode(inode, id);
 750         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 751
 752         child = &info->oti_child_dentry;
 753         child->d_name.hash = 0;
 754         child->d_name.name = name;
 755         child->d_name.len = strlen(name);
 756         child->d_parent = dir;
 757         child->d_inode = inode;
 758
 759         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 760                 inode->i_ino++;
 761
 762         ll_vfs_dq_init(dir->d_inode);
 763         mutex_lock(&dir->d_inode->i_mutex);
 764         rc = osd_ldiskfs_add_entry(info, osd, th, child, inode, NULL);
 765         mutex_unlock(&dir->d_inode->i_mutex);
 766
 767         RETURN(rc);
 768 }
 769
 770 /**
 771  * Use %llu for legacy OST sequences, but use %llx for new
 772  * sequences names, so that the O/{seq}/dN/{oid} more closely
 773  * follows the DFID/PFID format. This makes it easier to map from
 774  * debug messages to objects in the future, and the legacy space
 775  * of FID_SEQ_OST_MDT0 will be unused in the future.
 776  **/
 777 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 778 {
 779         snprintf(seq_name, name_size,
 780                  (fid_seq_is_rsvd(seq) ||
 781                   fid_seq_is_mdt0(seq)) ? "%llu" : "%llx",
 782                  fid_seq_is_idif(seq) ? 0 : seq);
 783 }
 784
 785 static inline void osd_oid_name(char *name, size_t name_size,
 786                                 const struct lu_fid *fid, u64 id)
 787 {
 788         snprintf(name, name_size,
 789                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 790                   fid_seq_is_mdt0(fid_seq(fid)) ||
 791                   fid_seq_is_idif(fid_seq(fid))) ? "%llu" : "%llx", id);
 792 }
 793
 794 /* external locking is required */
 795 static int osd_seq_load_locked(struct osd_thread_info *info,
 796                                struct osd_device *osd,
 797                                struct osd_obj_seq *osd_seq)
 798 {
 799         struct osd_obj_map  *map = osd->od_ost_map;
 800         struct dentry       *seq_dir;
 801         struct inode        *inode;
 802         struct lu_fid       *fid = &info->oti_fid3;
 803         int                 rc = 0;
 804         int                 i;
 805         char                dir_name[32];
 806         ENTRY;
 807
 808         if (osd_seq->oos_root != NULL)
 809                 RETURN(0);
 810
 811         LASSERT(map);
 812         LASSERT(map->om_root);
 813
 814         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 815
 816         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 817         if (IS_ERR(seq_dir))
 818                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 819         else if (seq_dir->d_inode == NULL)
 820                 GOTO(out_put, rc = -EFAULT);
 821
 822         inode = seq_dir->d_inode;
 823         osd_seq->oos_root = seq_dir;
 824
 825         /* 'What the @fid is' is not imporatant, because the object
 826          * has no OI mapping, and only is visible inside the OSD.*/
 827         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 828         rc = osd_ea_fid_set(info, inode, fid,
 829                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 830         if (rc != 0)
 831                 GOTO(out_put, rc);
 832
 833         LASSERT(osd_seq->oos_dirs == NULL);
 834         OBD_ALLOC(osd_seq->oos_dirs,
 835                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 836         if (osd_seq->oos_dirs == NULL)
 837                 GOTO(out_put, rc = -ENOMEM);
 838
 839         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 840                 struct dentry   *dir;
 841
 842                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 843                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 844                                    0700, 1);
 845                 if (IS_ERR(dir)) {
 846                         GOTO(out_free, rc = PTR_ERR(dir));
 847                 } else if (dir->d_inode == NULL) {
 848                         dput(dir);
 849                         GOTO(out_free, rc = -EFAULT);
 850                 }
 851
 852                 inode = dir->d_inode;
 853                 osd_seq->oos_dirs[i] = dir;
 854
 855                 /* 'What the @fid is' is not imporatant, because the object
 856                  * has no OI mapping, and only is visible inside the OSD.*/
 857                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 858                 rc = osd_ea_fid_set(info, inode, fid,
 859                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 860                 if (rc != 0)
 861                         GOTO(out_free, rc);
 862         }
 863
 864         if (rc != 0) {
 865 out_free:
 866                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 867                         if (osd_seq->oos_dirs[i] != NULL)
 868                                 dput(osd_seq->oos_dirs[i]);
 869                 }
 870                 OBD_FREE(osd_seq->oos_dirs,
 871                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 872 out_put:
 873                 dput(seq_dir);
 874                 osd_seq->oos_root = NULL;
 875         }
 876 out_err:
 877         RETURN(rc);
 878 }
 879
 880 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 881                                         struct osd_device *osd, u64 seq)
 882 {
 883         struct osd_obj_map      *map;
 884         struct osd_obj_seq      *osd_seq;
 885         int                     rc = 0;
 886         ENTRY;
 887
 888         map = osd->od_ost_map;
 889         LASSERT(map);
 890         LASSERT(map->om_root);
 891
 892         osd_seq = osd_seq_find(map, seq);
 893         if (likely(osd_seq != NULL))
 894                 RETURN(osd_seq);
 895
 896         /* Serializing init process */
 897         mutex_lock(&map->om_dir_init_mutex);
 898
 899         /* Check whether the seq has been added */
 900         read_lock(&map->om_seq_list_lock);
 901         osd_seq = osd_seq_find_locked(map, seq);
 902         if (osd_seq != NULL) {
 903                 read_unlock(&map->om_seq_list_lock);
 904                 GOTO(cleanup, rc = 0);
 905         }
 906         read_unlock(&map->om_seq_list_lock);
 907
 908         OBD_ALLOC_PTR(osd_seq);
 909         if (osd_seq == NULL)
 910                 GOTO(cleanup, rc = -ENOMEM);
 911
 912         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 913         osd_seq->oos_seq = seq;
 914         /* Init subdir count to be 32, but each seq can have
 915          * different subdir count */
 916         osd_seq->oos_subdir_count = map->om_subdir_count;
 917         rc = osd_seq_load_locked(info, osd, osd_seq);
 918         if (rc != 0)
 919                 GOTO(cleanup, rc);
 920
 921         write_lock(&map->om_seq_list_lock);
 922         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 923         write_unlock(&map->om_seq_list_lock);
 924
 925 cleanup:
 926         mutex_unlock(&map->om_dir_init_mutex);
 927         if (rc != 0) {
 928                 if (osd_seq != NULL)
 929                         OBD_FREE_PTR(osd_seq);
 930                 RETURN(ERR_PTR(rc));
 931         }
 932
 933         RETURN(osd_seq);
 934 }
 935
 936 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 937                        const struct lu_fid *fid, struct osd_inode_id *id)
 938 {
 939         struct osd_obj_map              *map;
 940         struct osd_obj_seq              *osd_seq;
 941         struct dentry                   *d_seq;
 942         struct dentry                   *child;
 943         struct ost_id                   *ostid = &info->oti_ostid;
 944         int                             dirn;
 945         char                            name[32];
 946         struct ldiskfs_dir_entry_2      *de;
 947         struct buffer_head              *bh;
 948         struct inode                    *dir;
 949         struct inode                    *inode;
 950         ENTRY;
 951
 952         /* on the very first lookup we find and open directories */
 953
 954         map = dev->od_ost_map;
 955         LASSERT(map);
 956         LASSERT(map->om_root);
 957
 958         fid_to_ostid(fid, ostid);
 959         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 960         if (IS_ERR(osd_seq))
 961                 RETURN(PTR_ERR(osd_seq));
 962
 963         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 964         d_seq = osd_seq->oos_dirs[dirn];
 965         LASSERT(d_seq);
 966
 967         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 968
 969         child = &info->oti_child_dentry;
 970         child->d_parent = d_seq;
 971         child->d_name.hash = 0;
 972         child->d_name.name = name;
 973         /* XXX: we can use rc from sprintf() instead of strlen() */
 974         child->d_name.len = strlen(name);
 975
 976         dir = d_seq->d_inode;
 977         mutex_lock(&dir->i_mutex);
 978         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 979         mutex_unlock(&dir->i_mutex);
 980
 981         if (IS_ERR(bh))
 982                 RETURN(PTR_ERR(bh));
 983
 984         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 985         brelse(bh);
 986
 987         inode = osd_iget(info, dev, id);
 988         if (IS_ERR(inode)) {
 989                 int rc = PTR_ERR(inode);
 990
 991                 RETURN(rc == -ENOENT ? -ESTALE : rc);
 992         }
 993
 994         iput(inode);
 995         RETURN(0);
 996 }
 997
 998 int osd_obj_map_insert(struct osd_thread_info *info,
 999                        struct osd_device *osd,
1000                        const struct lu_fid *fid,
1001                        const struct osd_inode_id *id,
1002                        handle_t *th)
1003 {
1004         struct osd_obj_map      *map;
1005         struct osd_obj_seq      *osd_seq;
1006         struct dentry           *d;
1007         struct ost_id           *ostid = &info->oti_ostid;
1008         u64                      oid;
1009         int                     dirn, rc = 0;
1010         char                    name[32];
1011         ENTRY;
1012
1013         map = osd->od_ost_map;
1014         LASSERT(map);
1015
1016         /* map fid to seq:objid */
1017         fid_to_ostid(fid, ostid);
1018
1019         oid = ostid_id(ostid);
1020         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1021         if (IS_ERR(osd_seq))
1022                 RETURN(PTR_ERR(osd_seq));
1023
1024         dirn = oid & (osd_seq->oos_subdir_count - 1);
1025         d = osd_seq->oos_dirs[dirn];
1026         LASSERT(d);
1027
1028         osd_oid_name(name, sizeof(name), fid, oid);
1029
1030 again:
1031         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1032         if (rc == -EEXIST) {
1033                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1034                 if (unlikely(rc == -ENOENT))
1035                         goto again;
1036
1037                 if (unlikely(rc == 1))
1038                         RETURN(0);
1039         }
1040
1041         RETURN(rc);
1042 }
1043
1044 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1045                        const struct lu_fid *fid, handle_t *th)
1046 {
1047         struct osd_obj_map      *map;
1048         struct osd_obj_seq      *osd_seq;
1049         struct dentry           *d;
1050         struct ost_id           *ostid = &info->oti_ostid;
1051         int                     dirn, rc = 0;
1052         char                    name[32];
1053         ENTRY;
1054
1055         map = osd->od_ost_map;
1056         LASSERT(map);
1057
1058         /* map fid to seq:objid */
1059         fid_to_ostid(fid, ostid);
1060
1061         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1062         if (IS_ERR(osd_seq))
1063                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1064
1065         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1066         d = osd_seq->oos_dirs[dirn];
1067         LASSERT(d);
1068
1069         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1070         rc = osd_obj_del_entry(info, osd, d, name, th);
1071 cleanup:
1072         RETURN(rc);
1073 }
1074
1075 int osd_obj_map_update(struct osd_thread_info *info,
1076                        struct osd_device *osd,
1077                        const struct lu_fid *fid,
1078                        const struct osd_inode_id *id,
1079                        handle_t *th)
1080 {
1081         struct osd_obj_seq      *osd_seq;
1082         struct dentry           *d;
1083         struct ost_id           *ostid = &info->oti_ostid;
1084         int                     dirn, rc = 0;
1085         char                    name[32];
1086         ENTRY;
1087
1088         fid_to_ostid(fid, ostid);
1089         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1090         if (IS_ERR(osd_seq))
1091                 RETURN(PTR_ERR(osd_seq));
1092
1093         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1094         d = osd_seq->oos_dirs[dirn];
1095         LASSERT(d);
1096
1097         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1098         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1099
1100         RETURN(rc);
1101 }
1102
1103 int osd_obj_map_recover(struct osd_thread_info *info,
1104                         struct osd_device *osd,
1105                         struct inode *src_parent,
1106                         struct dentry *src_child,
1107                         const struct lu_fid *fid)
1108 {
1109         struct osd_obj_seq         *osd_seq;
1110         struct dentry              *tgt_parent;
1111         struct dentry              *tgt_child = &info->oti_child_dentry;
1112         struct inode               *dir;
1113         struct inode               *inode     = src_child->d_inode;
1114         struct ost_id              *ostid     = &info->oti_ostid;
1115         handle_t                   *jh;
1116         struct ldiskfs_dir_entry_2 *de;
1117         struct buffer_head         *bh;
1118         char                        name[32];
1119         int                         dirn;
1120         int                         rc        = 0;
1121         ENTRY;
1122
1123         if (fid_is_last_id(fid)) {
1124                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1125                 if (IS_ERR(osd_seq))
1126                         RETURN(PTR_ERR(osd_seq));
1127
1128                 tgt_parent = osd_seq->oos_root;
1129                 tgt_child->d_name.name = "LAST_ID";
1130                 tgt_child->d_name.len = strlen("LAST_ID");
1131         } else {
1132                 fid_to_ostid(fid, ostid);
1133                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1134                 if (IS_ERR(osd_seq))
1135                         RETURN(PTR_ERR(osd_seq));
1136
1137                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1138                 tgt_parent = osd_seq->oos_dirs[dirn];
1139                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1140                 tgt_child->d_name.name = name;
1141                 tgt_child->d_name.len = strlen(name);
1142         }
1143         LASSERT(tgt_parent != NULL);
1144
1145         dir = tgt_parent->d_inode;
1146         tgt_child->d_name.hash = 0;
1147         tgt_child->d_parent = tgt_parent;
1148         tgt_child->d_inode = inode;
1149
1150         /* The non-initialized src_child may be destroyed. */
1151         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1152                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1153                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1154                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1155         if (IS_ERR(jh))
1156                 RETURN(PTR_ERR(jh));
1157
1158         ll_vfs_dq_init(src_parent);
1159         ll_vfs_dq_init(dir);
1160
1161         mutex_lock(&src_parent->i_mutex);
1162         mutex_lock(&dir->i_mutex);
1163         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1164         if (!IS_ERR(bh)) {
1165                 /* XXX: If some other object occupied the same slot. And If such
1166                  *      inode is zero-sized and with SUID+SGID, then means it is
1167                  *      a new created one. Maybe we can remove it and insert the
1168                  *      original one back to the /O/<seq>/d<x>. But there are
1169                  *      something to be considered:
1170                  *
1171                  *      1) The OST-object under /lost+found has crashed LMA.
1172                  *         So it should not conflict with the current one.
1173                  *
1174                  *      2) There are race conditions that: someone may just want
1175                  *         to modify the current one. Even if the OI scrub takes
1176                  *         the object lock when remove the current one, it still
1177                  *         cause the modification to be lost becasue the target
1178                  *         has been removed when the RPC service thread waiting
1179                  *         for the lock.
1180                  *
1181                  *      So keep it there before we have suitable solution. */
1182                 brelse(bh);
1183                 mutex_unlock(&dir->i_mutex);
1184                 mutex_unlock(&src_parent->i_mutex);
1185                 ldiskfs_journal_stop(jh);
1186
1187                 rc = -EEXIST;
1188                 /* If the src object has never been modified, then remove it. */
1189                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1190                     inode->i_mode & S_ISGID) {
1191                         rc = ll_vfs_unlink(src_parent, src_child);
1192                         if (unlikely(rc == -ENOENT))
1193                                 rc = 0;
1194                 }
1195                 RETURN(rc);
1196         }
1197
1198         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1199                                     NULL, NULL);
1200         if (unlikely(IS_ERR(bh)))
1201                 GOTO(unlock, rc = PTR_ERR(bh));
1202
1203         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1204         brelse(bh);
1205         if (rc != 0)
1206                 GOTO(unlock, rc);
1207
1208         rc = osd_ldiskfs_add_entry(info, osd, jh, tgt_child, inode, NULL);
1209
1210         GOTO(unlock, rc);
1211
1212 unlock:
1213         mutex_unlock(&dir->i_mutex);
1214         mutex_unlock(&src_parent->i_mutex);
1215         ldiskfs_journal_stop(jh);
1216         return rc;
1217 }
1218
1219 static struct dentry *
1220 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1221                      const struct lu_fid *fid, char **name)
1222 {
1223         struct dentry *root = ERR_PTR(-ENOENT);
1224
1225         if (fid_is_last_id(fid)) {
1226                 struct osd_obj_seq *osd_seq;
1227
1228                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1229                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1230                 if (IS_ERR(osd_seq))
1231                         RETURN((struct dentry *)osd_seq);
1232
1233                 *name = "LAST_ID";
1234                 root = osd_seq->oos_root;
1235         } else {
1236                 *name = osd_lf_fid2name(fid);
1237                 if (*name == NULL)
1238                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1239                 else if ((*name)[0])
1240                         root = osd_sb(osd)->s_root;
1241         }
1242
1243         return root;
1244 }
1245
1246 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1247                         const struct lu_fid *fid, const struct osd_inode_id *id,
1248                         handle_t *th)
1249 {
1250         struct dentry   *root;
1251         char            *name = NULL;
1252         int              rc;
1253         ENTRY;
1254
1255         root = osd_object_spec_find(info, osd, fid, &name);
1256         if (!IS_ERR(root)) {
1257                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1258         } else {
1259                 rc = PTR_ERR(root);
1260                 if (rc == -ENOENT)
1261                         rc = 1;
1262         }
1263
1264         RETURN(rc);
1265 }
1266
1267 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1268                         const struct lu_fid *fid, const struct osd_inode_id *id,
1269                         handle_t *th)
1270 {
1271         struct dentry   *root;
1272         char            *name = NULL;
1273         int              rc;
1274         ENTRY;
1275
1276         root = osd_object_spec_find(info, osd, fid, &name);
1277         if (!IS_ERR(root)) {
1278                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1279         } else {
1280                 rc = PTR_ERR(root);
1281                 if (rc == -ENOENT)
1282                         rc = 0;
1283         }
1284
1285         RETURN(rc);
1286 }
1287
1288 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1289                         const struct lu_fid *fid, struct osd_inode_id *id)
1290 {
1291         struct dentry   *root;
1292         struct dentry   *dentry;
1293         struct inode    *inode;
1294         char            *name = NULL;
1295         int             rc = -ENOENT;
1296         ENTRY;
1297
1298         if (fid_is_last_id(fid)) {
1299                 struct osd_obj_seq *osd_seq;
1300
1301                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1302                 if (IS_ERR(osd_seq))
1303                         RETURN(PTR_ERR(osd_seq));
1304                 root = osd_seq->oos_root;
1305                 name = "LAST_ID";
1306         } else {
1307                 root = osd_sb(osd)->s_root;
1308                 name = osd_lf_fid2name(fid);
1309                 if (name == NULL || strlen(name) == 0)
1310                         RETURN(-ENOENT);
1311         }
1312
1313         dentry = ll_lookup_one_len(name, root, strlen(name));
1314         if (!IS_ERR(dentry)) {
1315                 inode = dentry->d_inode;
1316                 if (inode) {
1317                         if (is_bad_inode(inode)) {
1318                                 rc = -EIO;
1319                         } else {
1320                                 osd_id_gen(id, inode->i_ino,
1321                                            inode->i_generation);
1322                                 rc = 0;
1323                         }
1324                 }
1325                 /* if dentry is accessible after osd_compat_spec_insert it
1326                  * will still contain NULL inode, so don't keep it in cache */
1327                 d_invalidate(dentry);
1328                 dput(dentry);
1329         }
1330
1331         RETURN(rc);
1332 }