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                 struct inode *inode;
 336
 337                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 338                 brelse(bh);
 339                 inode = osd_iget(oti, osd, id);
 340                 if (IS_ERR(inode)) {
 341                         rc = PTR_ERR(inode);
 342                         if (rc == -ESTALE)
 343                                 rc = -ENOENT;
 344                 } else {
 345                         iput(inode);
 346                         rc = 0;
 347                 }
 348         }
 349         mutex_unlock(&parent->d_inode->i_mutex);
 350         if (rc == 0)
 351                 osd_add_oi_cache(oti, osd, id, fid);
 352         RETURN(rc);
 353 }
 354
 355 /*
 356  * directory structure on legacy OST:
 357  *
 358  * O/<seq>/d0-31/<objid>
 359  * O/<seq>/LAST_ID
 360  * last_rcvd
 361  * LAST_GROUP
 362  * CONFIGS
 363  *
 364  */
 365 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 366 {
 367         struct lvfs_run_ctxt     new;
 368         struct lvfs_run_ctxt     save;
 369         struct dentry           *rootd = osd_sb(dev)->s_root;
 370         struct dentry           *d;
 371         struct osd_thread_info  *info = osd_oti_get(env);
 372         struct inode            *inode;
 373         struct lu_fid           *fid = &info->oti_fid3;
 374         int                      rc;
 375         ENTRY;
 376
 377         OBD_ALLOC_PTR(dev->od_ost_map);
 378         if (dev->od_ost_map == NULL)
 379                 RETURN(-ENOMEM);
 380
 381         /* to get subdir count from last_rcvd */
 382         rc = osd_last_rcvd_subdir_count(dev);
 383         if (rc < 0)
 384                 GOTO(cleanup_alloc, rc);
 385
 386         dev->od_ost_map->om_subdir_count = rc;
 387         rc = 0;
 388
 389         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 390         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 391         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 392
 393         osd_push_ctxt(dev, &new, &save);
 394
 395         d = ll_lookup_one_len("O", rootd, strlen("O"));
 396         if (IS_ERR(d))
 397                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 398         if (d->d_inode == NULL) {
 399                 dput(d);
 400                 /* The lookup() may be called again inside simple_mkdir().
 401                  * Since the repeated lookup() only be called for "/O" at
 402                  * mount time, it will not affect the whole performance. */
 403                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
 404                 if (IS_ERR(d))
 405                         GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 406
 407                 /* It is quite probably that the device is new formatted. */
 408                 dev->od_maybe_new = 1;
 409         }
 410
 411         inode = d->d_inode;
 412         dev->od_ost_map->om_root = d;
 413
 414         /* 'What the @fid is' is not imporatant, because the object
 415          * has no OI mapping, and only is visible inside the OSD.*/
 416         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 417         rc = osd_ea_fid_set(info, inode, fid,
 418                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 419         if (rc)
 420                 GOTO(cleanup_dentry, rc);
 421
 422         pop_ctxt(&save, &new);
 423         RETURN(0);
 424
 425 cleanup_dentry:
 426         dput(d);
 427 cleanup_ctxt:
 428         pop_ctxt(&save, &new);
 429 cleanup_alloc:
 430         OBD_FREE_PTR(dev->od_ost_map);
 431         return rc;
 432 }
 433
 434 static void osd_seq_free(struct osd_obj_seq *osd_seq)
 435 {
 436         int j;
 437
 438         if (osd_seq->oos_dirs) {
 439                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 440                         if (osd_seq->oos_dirs[j])
 441                                 dput(osd_seq->oos_dirs[j]);
 442                 }
 443                 OBD_FREE(osd_seq->oos_dirs,
 444                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 445         }
 446
 447         if (osd_seq->oos_root)
 448                 dput(osd_seq->oos_root);
 449
 450         OBD_FREE_PTR(osd_seq);
 451 }
 452
 453 static void osd_ost_fini(struct osd_device *osd)
 454 {
 455         struct osd_obj_seq    *osd_seq;
 456         struct osd_obj_seq    *tmp;
 457         struct osd_obj_map    *map = osd->od_ost_map;
 458         ENTRY;
 459
 460         if (map == NULL)
 461                 return;
 462
 463         write_lock(&map->om_seq_list_lock);
 464         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 465                                  oos_seq_list) {
 466                 list_del_init(&osd_seq->oos_seq_list);
 467                 write_unlock(&map->om_seq_list_lock);
 468                 osd_seq_free(osd_seq);
 469                 write_lock(&map->om_seq_list_lock);
 470         }
 471         write_unlock(&map->om_seq_list_lock);
 472         if (map->om_root)
 473                 dput(map->om_root);
 474         OBD_FREE_PTR(map);
 475         osd->od_ost_map = NULL;
 476         EXIT;
 477 }
 478
 479 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 480 {
 481         int rc;
 482         ENTRY;
 483
 484         /* prepare structures for OST */
 485         rc = osd_ost_init(env, dev);
 486         if (rc)
 487                 RETURN(rc);
 488
 489         /* prepare structures for MDS */
 490         rc = osd_mdt_init(env, dev);
 491         if (rc)
 492                 osd_ost_fini(dev);
 493
 494         RETURN(rc);
 495 }
 496
 497 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 498 {
 499         struct osd_obj_seq *osd_seq;
 500
 501         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 502                 if (osd_seq->oos_seq == seq)
 503                         return osd_seq;
 504         }
 505         return NULL;
 506 }
 507
 508 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 509 {
 510         struct osd_obj_seq *osd_seq;
 511
 512         read_lock(&map->om_seq_list_lock);
 513         osd_seq = osd_seq_find_locked(map, seq);
 514         read_unlock(&map->om_seq_list_lock);
 515         return osd_seq;
 516 }
 517
 518 void osd_obj_map_fini(struct osd_device *dev)
 519 {
 520         osd_ost_fini(dev);
 521         osd_mdt_fini(dev);
 522 }
 523
 524 /**
 525  * Update the specified OI mapping.
 526  *
 527  * \retval   1, changed nothing
 528  * \retval   0, changed successfully
 529  * \retval -ve, on error
 530  */
 531 static int osd_obj_update_entry(struct osd_thread_info *info,
 532                                 struct osd_device *osd,
 533                                 struct dentry *dir, const char *name,
 534                                 const struct lu_fid *fid,
 535                                 const struct osd_inode_id *id,
 536                                 handle_t *th)
 537 {
 538         struct inode               *parent = dir->d_inode;
 539         struct dentry              *child;
 540         struct ldiskfs_dir_entry_2 *de;
 541         struct buffer_head         *bh;
 542         struct inode               *inode;
 543         struct dentry              *dentry = &info->oti_obj_dentry;
 544         struct osd_inode_id        *oi_id  = &info->oti_id3;
 545         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
 546         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 547         int                         rc;
 548         ENTRY;
 549
 550         LASSERT(th != NULL);
 551         LASSERT(th->h_transaction != NULL);
 552
 553         child = &info->oti_child_dentry;
 554         child->d_parent = dir;
 555         child->d_name.hash = 0;
 556         child->d_name.name = name;
 557         child->d_name.len = strlen(name);
 558
 559         ll_vfs_dq_init(parent);
 560         mutex_lock(&parent->i_mutex);
 561         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 562         if (bh == NULL)
 563                 GOTO(out, rc = -ENOENT);
 564
 565         if (le32_to_cpu(de->inode) == id->oii_ino)
 566                 GOTO(out, rc = 1);
 567
 568         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 569         inode = osd_iget(info, osd, oi_id);
 570         if (IS_ERR(inode)) {
 571                 rc = PTR_ERR(inode);
 572                 if (rc == -ENOENT || rc == -ESTALE)
 573                         goto update;
 574                 GOTO(out, rc);
 575         }
 576
 577         /* The EA inode should NOT be in OI, old OI scrub may added
 578          * such OI mapping by wrong, replace it. */
 579         if (unlikely(osd_is_ea_inode(inode))) {
 580                 iput(inode);
 581                 goto update;
 582         }
 583
 584         rc = osd_get_lma(info, inode, dentry, lma);
 585         if (rc == -ENODATA) {
 586                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 587                 if (rc > 0 || rc == -ENODATA) {
 588                         oi_fid = NULL;
 589                         rc = 0;
 590                 }
 591         }
 592         iput(inode);
 593
 594         if (rc != 0)
 595                 GOTO(out, rc);
 596
 597         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 598          * either a crashed object or a uninitialized one. Replace it. */
 599         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
 600                 CERROR("%s: the FID "DFID" is used by two objects: "
 601                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 602                        oi_id->oii_ino, oi_id->oii_gen,
 603                        id->oii_ino, id->oii_gen);
 604                 GOTO(out, rc = -EEXIST);
 605         }
 606
 607         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
 608                 __u32 idx1 = fid_idif_ost_idx(fid);
 609                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
 610                 struct ost_id *ostid = &info->oti_ostid;
 611                 struct lu_fid *tfid = &info->oti_fid3;
 612
 613                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
 614                          "invalid given FID "DFID", not match the "
 615                          "device index %u\n", PFID(fid), osd->od_index);
 616
 617                 if (idx1 != idx2) {
 618                         if (idx1 == 0 && idx2 == osd->od_index) {
 619                                 fid_to_ostid(fid, ostid);
 620                                 ostid_to_fid(tfid, ostid, idx2);
 621                                 if (lu_fid_eq(tfid, oi_fid)) {
 622                                         CERROR("%s: the FID "DFID" is used by "
 623                                                "two objects(2): %u/%u %u/%u\n",
 624                                                osd_name(osd), PFID(fid),
 625                                                oi_id->oii_ino, oi_id->oii_gen,
 626                                                id->oii_ino, id->oii_gen);
 627
 628                                         GOTO(out, rc = -EEXIST);
 629                                 }
 630                         } else if (idx2 == 0 && idx1 == osd->od_index) {
 631                                 fid_to_ostid(oi_fid, ostid);
 632                                 ostid_to_fid(tfid, ostid, idx1);
 633                                 if (lu_fid_eq(tfid, fid)) {
 634                                         CERROR("%s: the FID "DFID" is used by "
 635                                                "two objects(2): %u/%u %u/%u\n",
 636                                                osd_name(osd), PFID(fid),
 637                                                oi_id->oii_ino, oi_id->oii_gen,
 638                                                id->oii_ino, id->oii_gen);
 639
 640                                         GOTO(out, rc = -EEXIST);
 641                                 }
 642                         }
 643                 }
 644         }
 645
 646 update:
 647         /* There may be temporary inconsistency: On one hand, the new
 648          * object may be referenced by multiple entries, which is out
 649          * of our control unless we traverse the whole /O completely,
 650          * which is non-flat order and inefficient, should be avoided;
 651          * On the other hand, the old object may become orphan if it
 652          * is still valid. Since it was referenced by an invalid entry,
 653          * making it as invisible temporary may be not worse. OI scrub
 654          * will process it later. */
 655         rc = ldiskfs_journal_get_write_access(th, bh);
 656         if (rc != 0)
 657                 GOTO(out, rc);
 658
 659         de->inode = cpu_to_le32(id->oii_ino);
 660         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 661
 662         GOTO(out, rc);
 663
 664 out:
 665         brelse(bh);
 666         mutex_unlock(&parent->i_mutex);
 667         return rc;
 668 }
 669
 670 static int osd_obj_del_entry(struct osd_thread_info *info,
 671                              struct osd_device *osd,
 672                              struct dentry *dird, char *name,
 673                              handle_t *th)
 674 {
 675         struct ldiskfs_dir_entry_2 *de;
 676         struct buffer_head         *bh;
 677         struct dentry              *child;
 678         struct inode               *dir = dird->d_inode;
 679         int                         rc;
 680         ENTRY;
 681
 682         LASSERT(th != NULL);
 683         LASSERT(th->h_transaction != NULL);
 684
 685
 686         child = &info->oti_child_dentry;
 687         child->d_name.hash = 0;
 688         child->d_name.name = name;
 689         child->d_name.len = strlen(name);
 690         child->d_parent = dird;
 691         child->d_inode = NULL;
 692
 693         ll_vfs_dq_init(dir);
 694         mutex_lock(&dir->i_mutex);
 695         rc = -ENOENT;
 696         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 697         if (bh) {
 698                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 699                 brelse(bh);
 700         }
 701         mutex_unlock(&dir->i_mutex);
 702
 703         RETURN(rc);
 704 }
 705
 706 static int osd_obj_add_entry(struct osd_thread_info *info,
 707                              struct osd_device *osd,
 708                              struct dentry *dir, char *name,
 709                              const struct osd_inode_id *id,
 710                              handle_t *th)
 711 {
 712         struct dentry *child;
 713         struct inode *inode;
 714         int rc;
 715
 716         ENTRY;
 717
 718         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 719                 RETURN(0);
 720
 721         LASSERT(th != NULL);
 722         LASSERT(th->h_transaction != NULL);
 723
 724         inode = info->oti_inode;
 725         if (unlikely(inode == NULL)) {
 726                 struct ldiskfs_inode_info *lii;
 727                 OBD_ALLOC_PTR(lii);
 728                 if (lii == NULL)
 729                         RETURN(-ENOMEM);
 730                 inode = info->oti_inode = &lii->vfs_inode;
 731         }
 732
 733         inode->i_sb = osd_sb(osd);
 734         osd_id_to_inode(inode, id);
 735         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 736
 737         child = &info->oti_child_dentry;
 738         child->d_name.hash = 0;
 739         child->d_name.name = name;
 740         child->d_name.len = strlen(name);
 741         child->d_parent = dir;
 742         child->d_inode = inode;
 743
 744         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 745                 inode->i_ino++;
 746
 747         ll_vfs_dq_init(dir->d_inode);
 748         mutex_lock(&dir->d_inode->i_mutex);
 749         rc = osd_ldiskfs_add_entry(info, th, child, inode, NULL);
 750         mutex_unlock(&dir->d_inode->i_mutex);
 751
 752         RETURN(rc);
 753 }
 754
 755 /**
 756  * Use LPU64 for legacy OST sequences, but use LPX64i for new
 757  * sequences names, so that the O/{seq}/dN/{oid} more closely
 758  * follows the DFID/PFID format. This makes it easier to map from
 759  * debug messages to objects in the future, and the legacy space
 760  * of FID_SEQ_OST_MDT0 will be unused in the future.
 761  **/
 762 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 763 {
 764         snprintf(seq_name, name_size,
 765                  (fid_seq_is_rsvd(seq) ||
 766                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
 767                  fid_seq_is_idif(seq) ? 0 : seq);
 768 }
 769
 770 static inline void osd_oid_name(char *name, size_t name_size,
 771                                 const struct lu_fid *fid, u64 id)
 772 {
 773         snprintf(name, name_size,
 774                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 775                   fid_seq_is_mdt0(fid_seq(fid)) ||
 776                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 777 }
 778
 779 /* external locking is required */
 780 static int osd_seq_load_locked(struct osd_thread_info *info,
 781                                struct osd_device *osd,
 782                                struct osd_obj_seq *osd_seq)
 783 {
 784         struct osd_obj_map  *map = osd->od_ost_map;
 785         struct dentry       *seq_dir;
 786         struct inode        *inode;
 787         struct lu_fid       *fid = &info->oti_fid3;
 788         int                 rc = 0;
 789         int                 i;
 790         char                dir_name[32];
 791         ENTRY;
 792
 793         if (osd_seq->oos_root != NULL)
 794                 RETURN(0);
 795
 796         LASSERT(map);
 797         LASSERT(map->om_root);
 798
 799         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 800
 801         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
 802         if (IS_ERR(seq_dir))
 803                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 804         else if (seq_dir->d_inode == NULL)
 805                 GOTO(out_put, rc = -EFAULT);
 806
 807         inode = seq_dir->d_inode;
 808         osd_seq->oos_root = seq_dir;
 809
 810         /* 'What the @fid is' is not imporatant, because the object
 811          * has no OI mapping, and only is visible inside the OSD.*/
 812         lu_igif_build(fid, inode->i_ino, inode->i_generation);
 813         rc = osd_ea_fid_set(info, inode, fid,
 814                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 815         if (rc != 0)
 816                 GOTO(out_put, rc);
 817
 818         LASSERT(osd_seq->oos_dirs == NULL);
 819         OBD_ALLOC(osd_seq->oos_dirs,
 820                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 821         if (osd_seq->oos_dirs == NULL)
 822                 GOTO(out_put, rc = -ENOMEM);
 823
 824         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 825                 struct dentry   *dir;
 826
 827                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 828                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
 829                                    0700, 1);
 830                 if (IS_ERR(dir)) {
 831                         GOTO(out_free, rc = PTR_ERR(dir));
 832                 } else if (dir->d_inode == NULL) {
 833                         dput(dir);
 834                         GOTO(out_free, rc = -EFAULT);
 835                 }
 836
 837                 inode = dir->d_inode;
 838                 osd_seq->oos_dirs[i] = dir;
 839
 840                 /* 'What the @fid is' is not imporatant, because the object
 841                  * has no OI mapping, and only is visible inside the OSD.*/
 842                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 843                 rc = osd_ea_fid_set(info, inode, fid,
 844                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
 845                 if (rc != 0)
 846                         GOTO(out_free, rc);
 847         }
 848
 849         if (rc != 0) {
 850 out_free:
 851                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 852                         if (osd_seq->oos_dirs[i] != NULL)
 853                                 dput(osd_seq->oos_dirs[i]);
 854                 }
 855                 OBD_FREE(osd_seq->oos_dirs,
 856                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 857 out_put:
 858                 dput(seq_dir);
 859                 osd_seq->oos_root = NULL;
 860         }
 861 out_err:
 862         RETURN(rc);
 863 }
 864
 865 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 866                                         struct osd_device *osd, u64 seq)
 867 {
 868         struct osd_obj_map      *map;
 869         struct osd_obj_seq      *osd_seq;
 870         int                     rc = 0;
 871         ENTRY;
 872
 873         map = osd->od_ost_map;
 874         LASSERT(map);
 875         LASSERT(map->om_root);
 876
 877         osd_seq = osd_seq_find(map, seq);
 878         if (likely(osd_seq != NULL))
 879                 RETURN(osd_seq);
 880
 881         /* Serializing init process */
 882         mutex_lock(&map->om_dir_init_mutex);
 883
 884         /* Check whether the seq has been added */
 885         read_lock(&map->om_seq_list_lock);
 886         osd_seq = osd_seq_find_locked(map, seq);
 887         if (osd_seq != NULL) {
 888                 read_unlock(&map->om_seq_list_lock);
 889                 GOTO(cleanup, rc = 0);
 890         }
 891         read_unlock(&map->om_seq_list_lock);
 892
 893         OBD_ALLOC_PTR(osd_seq);
 894         if (osd_seq == NULL)
 895                 GOTO(cleanup, rc = -ENOMEM);
 896
 897         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 898         osd_seq->oos_seq = seq;
 899         /* Init subdir count to be 32, but each seq can have
 900          * different subdir count */
 901         osd_seq->oos_subdir_count = map->om_subdir_count;
 902         rc = osd_seq_load_locked(info, osd, osd_seq);
 903         if (rc != 0)
 904                 GOTO(cleanup, rc);
 905
 906         write_lock(&map->om_seq_list_lock);
 907         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 908         write_unlock(&map->om_seq_list_lock);
 909
 910 cleanup:
 911         mutex_unlock(&map->om_dir_init_mutex);
 912         if (rc != 0) {
 913                 if (osd_seq != NULL)
 914                         OBD_FREE_PTR(osd_seq);
 915                 RETURN(ERR_PTR(rc));
 916         }
 917
 918         RETURN(osd_seq);
 919 }
 920
 921 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 922                        const struct lu_fid *fid, struct osd_inode_id *id)
 923 {
 924         struct osd_obj_map              *map;
 925         struct osd_obj_seq              *osd_seq;
 926         struct dentry                   *d_seq;
 927         struct dentry                   *child;
 928         struct ost_id                   *ostid = &info->oti_ostid;
 929         int                             dirn;
 930         char                            name[32];
 931         struct ldiskfs_dir_entry_2      *de;
 932         struct buffer_head              *bh;
 933         struct inode                    *dir;
 934         struct inode                    *inode;
 935         ENTRY;
 936
 937         /* on the very first lookup we find and open directories */
 938
 939         map = dev->od_ost_map;
 940         LASSERT(map);
 941         LASSERT(map->om_root);
 942
 943         fid_to_ostid(fid, ostid);
 944         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
 945         if (IS_ERR(osd_seq))
 946                 RETURN(PTR_ERR(osd_seq));
 947
 948         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
 949         d_seq = osd_seq->oos_dirs[dirn];
 950         LASSERT(d_seq);
 951
 952         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 953
 954         child = &info->oti_child_dentry;
 955         child->d_parent = d_seq;
 956         child->d_name.hash = 0;
 957         child->d_name.name = name;
 958         /* XXX: we can use rc from sprintf() instead of strlen() */
 959         child->d_name.len = strlen(name);
 960
 961         dir = d_seq->d_inode;
 962         mutex_lock(&dir->i_mutex);
 963         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 964         mutex_unlock(&dir->i_mutex);
 965
 966         if (bh == NULL)
 967                 RETURN(-ENOENT);
 968
 969         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 970         brelse(bh);
 971
 972         inode = osd_iget(info, dev, id);
 973         if (IS_ERR(inode)) {
 974                 int rc = PTR_ERR(inode);
 975
 976                 RETURN(rc == -ENOENT ? -ESTALE : rc);
 977         }
 978
 979         iput(inode);
 980         RETURN(0);
 981 }
 982
 983 int osd_obj_map_insert(struct osd_thread_info *info,
 984                        struct osd_device *osd,
 985                        const struct lu_fid *fid,
 986                        const struct osd_inode_id *id,
 987                        handle_t *th)
 988 {
 989         struct osd_obj_map      *map;
 990         struct osd_obj_seq      *osd_seq;
 991         struct dentry           *d;
 992         struct ost_id           *ostid = &info->oti_ostid;
 993         u64                      oid;
 994         int                     dirn, rc = 0;
 995         char                    name[32];
 996         ENTRY;
 997
 998         map = osd->od_ost_map;
 999         LASSERT(map);
1000
1001         /* map fid to seq:objid */
1002         fid_to_ostid(fid, ostid);
1003
1004         oid = ostid_id(ostid);
1005         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1006         if (IS_ERR(osd_seq))
1007                 RETURN(PTR_ERR(osd_seq));
1008
1009         dirn = oid & (osd_seq->oos_subdir_count - 1);
1010         d = osd_seq->oos_dirs[dirn];
1011         LASSERT(d);
1012
1013         osd_oid_name(name, sizeof(name), fid, oid);
1014
1015 again:
1016         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1017         if (rc == -EEXIST) {
1018                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1019                 if (unlikely(rc == -ENOENT))
1020                         goto again;
1021
1022                 if (unlikely(rc == 1))
1023                         RETURN(0);
1024         }
1025
1026         RETURN(rc);
1027 }
1028
1029 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1030                        const struct lu_fid *fid, handle_t *th)
1031 {
1032         struct osd_obj_map      *map;
1033         struct osd_obj_seq      *osd_seq;
1034         struct dentry           *d;
1035         struct ost_id           *ostid = &info->oti_ostid;
1036         int                     dirn, rc = 0;
1037         char                    name[32];
1038         ENTRY;
1039
1040         map = osd->od_ost_map;
1041         LASSERT(map);
1042
1043         /* map fid to seq:objid */
1044         fid_to_ostid(fid, ostid);
1045
1046         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1047         if (IS_ERR(osd_seq))
1048                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1049
1050         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1051         d = osd_seq->oos_dirs[dirn];
1052         LASSERT(d);
1053
1054         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1055         rc = osd_obj_del_entry(info, osd, d, name, th);
1056 cleanup:
1057         RETURN(rc);
1058 }
1059
1060 int osd_obj_map_update(struct osd_thread_info *info,
1061                        struct osd_device *osd,
1062                        const struct lu_fid *fid,
1063                        const struct osd_inode_id *id,
1064                        handle_t *th)
1065 {
1066         struct osd_obj_seq      *osd_seq;
1067         struct dentry           *d;
1068         struct ost_id           *ostid = &info->oti_ostid;
1069         int                     dirn, rc = 0;
1070         char                    name[32];
1071         ENTRY;
1072
1073         fid_to_ostid(fid, ostid);
1074         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1075         if (IS_ERR(osd_seq))
1076                 RETURN(PTR_ERR(osd_seq));
1077
1078         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1079         d = osd_seq->oos_dirs[dirn];
1080         LASSERT(d);
1081
1082         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1083         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1084
1085         RETURN(rc);
1086 }
1087
1088 int osd_obj_map_recover(struct osd_thread_info *info,
1089                         struct osd_device *osd,
1090                         struct inode *src_parent,
1091                         struct dentry *src_child,
1092                         const struct lu_fid *fid)
1093 {
1094         struct osd_obj_seq         *osd_seq;
1095         struct dentry              *tgt_parent;
1096         struct dentry              *tgt_child = &info->oti_child_dentry;
1097         struct inode               *dir;
1098         struct inode               *inode     = src_child->d_inode;
1099         struct ost_id              *ostid     = &info->oti_ostid;
1100         handle_t                   *jh;
1101         struct ldiskfs_dir_entry_2 *de;
1102         struct buffer_head         *bh;
1103         char                        name[32];
1104         int                         dirn;
1105         int                         rc        = 0;
1106         ENTRY;
1107
1108         if (fid_is_last_id(fid)) {
1109                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1110                 if (IS_ERR(osd_seq))
1111                         RETURN(PTR_ERR(osd_seq));
1112
1113                 tgt_parent = osd_seq->oos_root;
1114                 tgt_child->d_name.name = "LAST_ID";
1115                 tgt_child->d_name.len = strlen("LAST_ID");
1116         } else {
1117                 fid_to_ostid(fid, ostid);
1118                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1119                 if (IS_ERR(osd_seq))
1120                         RETURN(PTR_ERR(osd_seq));
1121
1122                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1123                 tgt_parent = osd_seq->oos_dirs[dirn];
1124                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1125                 tgt_child->d_name.name = name;
1126                 tgt_child->d_name.len = strlen(name);
1127         }
1128         LASSERT(tgt_parent != NULL);
1129
1130         dir = tgt_parent->d_inode;
1131         tgt_child->d_name.hash = 0;
1132         tgt_child->d_parent = tgt_parent;
1133         tgt_child->d_inode = inode;
1134
1135         /* The non-initialized src_child may be destroyed. */
1136         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1137                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1138                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1139                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1140         if (IS_ERR(jh))
1141                 RETURN(PTR_ERR(jh));
1142
1143         ll_vfs_dq_init(src_parent);
1144         ll_vfs_dq_init(dir);
1145
1146         mutex_lock(&src_parent->i_mutex);
1147         mutex_lock(&dir->i_mutex);
1148         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1149         if (bh != NULL) {
1150                 /* XXX: If some other object occupied the same slot. And If such
1151                  *      inode is zero-sized and with SUID+SGID, then means it is
1152                  *      a new created one. Maybe we can remove it and insert the
1153                  *      original one back to the /O/<seq>/d<x>. But there are
1154                  *      something to be considered:
1155                  *
1156                  *      1) The OST-object under /lost+found has crashed LMA.
1157                  *         So it should not conflict with the current one.
1158                  *
1159                  *      2) There are race conditions that: someone may just want
1160                  *         to modify the current one. Even if the OI scrub takes
1161                  *         the object lock when remove the current one, it still
1162                  *         cause the modification to be lost becasue the target
1163                  *         has been removed when the RPC service thread waiting
1164                  *         for the lock.
1165                  *
1166                  *      So keep it there before we have suitable solution. */
1167                 brelse(bh);
1168                 mutex_unlock(&dir->i_mutex);
1169                 mutex_unlock(&src_parent->i_mutex);
1170                 ldiskfs_journal_stop(jh);
1171
1172                 rc = -EEXIST;
1173                 /* If the src object has never been modified, then remove it. */
1174                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1175                     inode->i_mode & S_ISGID) {
1176                         rc = ll_vfs_unlink(src_parent, src_child);
1177                         if (unlikely(rc == -ENOENT))
1178                                 rc = 0;
1179                 }
1180                 RETURN(rc);
1181         }
1182
1183         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1184                                     NULL, NULL);
1185         if (unlikely(bh == NULL))
1186                 GOTO(unlock, rc = -ENOENT);
1187
1188         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1189         brelse(bh);
1190         if (rc != 0)
1191                 GOTO(unlock, rc);
1192
1193         rc = osd_ldiskfs_add_entry(info, jh, tgt_child, inode, NULL);
1194
1195         GOTO(unlock, rc);
1196
1197 unlock:
1198         mutex_unlock(&dir->i_mutex);
1199         mutex_unlock(&src_parent->i_mutex);
1200         ldiskfs_journal_stop(jh);
1201         return rc;
1202 }
1203
1204 static struct dentry *
1205 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1206                      const struct lu_fid *fid, char **name)
1207 {
1208         struct dentry *root = ERR_PTR(-ENOENT);
1209
1210         if (fid_is_last_id(fid)) {
1211                 struct osd_obj_seq *osd_seq;
1212
1213                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1214                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1215                 if (IS_ERR(osd_seq))
1216                         RETURN((struct dentry *)osd_seq);
1217
1218                 *name = "LAST_ID";
1219                 root = osd_seq->oos_root;
1220         } else {
1221                 *name = osd_lf_fid2name(fid);
1222                 if (*name == NULL)
1223                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1224                 else if ((*name)[0])
1225                         root = osd_sb(osd)->s_root;
1226         }
1227
1228         return root;
1229 }
1230
1231 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1232                         const struct lu_fid *fid, const struct osd_inode_id *id,
1233                         handle_t *th)
1234 {
1235         struct dentry   *root;
1236         char            *name = NULL;
1237         int              rc;
1238         ENTRY;
1239
1240         root = osd_object_spec_find(info, osd, fid, &name);
1241         if (!IS_ERR(root)) {
1242                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1243         } else {
1244                 rc = PTR_ERR(root);
1245                 if (rc == -ENOENT)
1246                         rc = 1;
1247         }
1248
1249         RETURN(rc);
1250 }
1251
1252 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1253                         const struct lu_fid *fid, const struct osd_inode_id *id,
1254                         handle_t *th)
1255 {
1256         struct dentry   *root;
1257         char            *name = NULL;
1258         int              rc;
1259         ENTRY;
1260
1261         root = osd_object_spec_find(info, osd, fid, &name);
1262         if (!IS_ERR(root)) {
1263                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1264         } else {
1265                 rc = PTR_ERR(root);
1266                 if (rc == -ENOENT)
1267                         rc = 0;
1268         }
1269
1270         RETURN(rc);
1271 }
1272
1273 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1274                         const struct lu_fid *fid, struct osd_inode_id *id)
1275 {
1276         struct dentry   *root;
1277         struct dentry   *dentry;
1278         struct inode    *inode;
1279         char            *name = NULL;
1280         int             rc = -ENOENT;
1281         ENTRY;
1282
1283         if (fid_is_last_id(fid)) {
1284                 struct osd_obj_seq *osd_seq;
1285
1286                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1287                 if (IS_ERR(osd_seq))
1288                         RETURN(PTR_ERR(osd_seq));
1289                 root = osd_seq->oos_root;
1290                 name = "LAST_ID";
1291         } else {
1292                 root = osd_sb(osd)->s_root;
1293                 name = osd_lf_fid2name(fid);
1294                 if (name == NULL || strlen(name) == 0)
1295                         RETURN(-ENOENT);
1296         }
1297
1298         dentry = ll_lookup_one_len(name, root, strlen(name));
1299         if (!IS_ERR(dentry)) {
1300                 inode = dentry->d_inode;
1301                 if (inode) {
1302                         if (is_bad_inode(inode)) {
1303                                 rc = -EIO;
1304                         } else {
1305                                 osd_id_gen(id, inode->i_ino,
1306                                            inode->i_generation);
1307                                 rc = 0;
1308                         }
1309                 }
1310                 /* if dentry is accessible after osd_compat_spec_insert it
1311                  * will still contain NULL inode, so don't keep it in cache */
1312                 d_invalidate(dentry);
1313                 dput(dentry);
1314         }
1315
1316         RETURN(rc);
1317 }