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LU-7268 scrub: NOT assign LMA for EA inode
[fs/lustre-release.git] / 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 dentry           *dentry;
229         struct dentry           *parent;
230         int                     rc;
231
232         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
233          * can identify this object quickly */
234         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
235         if (rc != 0)
236                 RETURN(rc);
237
238         lma->lma_incompat |= LMAI_REMOTE_PARENT;
239         lustre_lma_swab(lma);
240         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
241                              sizeof(*lma), XATTR_REPLACE);
242         if (rc != 0)
243                 RETURN(rc);
244
245         parent = omm->omm_remote_parent;
246         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
247         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
248                                            name, strlen(name));
249         mutex_lock(&parent->d_inode->i_mutex);
250         rc = osd_ldiskfs_add_entry(oh->ot_handle, dentry, obj->oo_inode,
251                                    NULL);
252         CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
253                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
254         ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
255         mark_inode_dirty(parent->d_inode);
256         mutex_unlock(&parent->d_inode->i_mutex);
257         RETURN(rc);
258 }
259
260 int osd_delete_from_remote_parent(const struct lu_env *env,
261                                   struct osd_device *osd,
262                                   struct osd_object *obj,
263                                   struct osd_thandle *oh)
264 {
265         struct osd_mdobj_map       *omm = osd->od_mdt_map;
266         struct osd_thread_info     *oti = osd_oti_get(env);
267         struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
268         char                       *name = oti->oti_name;
269         struct dentry              *dentry;
270         struct dentry              *parent;
271         struct ldiskfs_dir_entry_2 *de;
272         struct buffer_head         *bh;
273         int                        rc;
274
275         /* Check lma to see whether it is remote object */
276         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
277         if (rc != 0)
278                 RETURN(rc);
279
280         if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
281                 RETURN(0);
282
283         parent = omm->omm_remote_parent;
284         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
285         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
286                                            name, strlen(name));
287         mutex_lock(&parent->d_inode->i_mutex);
288         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
289                                     NULL, NULL);
290         if (bh == NULL) {
291                 mutex_unlock(&parent->d_inode->i_mutex);
292                 RETURN(-ENOENT);
293         }
294         CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
295                name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
296         rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
297         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
298         mark_inode_dirty(parent->d_inode);
299         mutex_unlock(&parent->d_inode->i_mutex);
300         brelse(bh);
301
302         /* Get rid of REMOTE_PARENT flag from incompat */
303         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
304         lustre_lma_swab(lma);
305         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
306                              sizeof(*lma), XATTR_REPLACE);
307         RETURN(rc);
308 }
309
310 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
311                                 struct osd_device *osd,
312                                 const struct lu_fid *fid,
313                                 struct osd_inode_id *id)
314 {
315         struct osd_mdobj_map        *omm = osd->od_mdt_map;
316         char                        *name = oti->oti_name;
317         struct dentry               *parent;
318         struct dentry               *dentry;
319         struct ldiskfs_dir_entry_2 *de;
320         struct buffer_head         *bh;
321         int                         rc;
322         ENTRY;
323
324         parent = omm->omm_remote_parent;
325         sprintf(name, DFID_NOBRACE, PFID(fid));
326         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
327                                            name, strlen(name));
328         mutex_lock(&parent->d_inode->i_mutex);
329         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
330                                     NULL, NULL);
331         if (bh == NULL) {
332                 rc = -ENOENT;
333         } else {
334                 rc = 0;
335                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
336                 brelse(bh);
337         }
338         mutex_unlock(&parent->d_inode->i_mutex);
339         if (rc == 0)
340                 osd_add_oi_cache(oti, osd, id, fid);
341         RETURN(rc);
342 }
343
344 /*
345  * directory structure on legacy OST:
346  *
347  * O/<seq>/d0-31/<objid>
348  * O/<seq>/LAST_ID
349  * last_rcvd
350  * LAST_GROUP
351  * CONFIGS
352  *
353  */
354 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
355 {
356         struct lvfs_run_ctxt     new;
357         struct lvfs_run_ctxt     save;
358         struct dentry           *rootd = osd_sb(dev)->s_root;
359         struct dentry           *d;
360         struct osd_thread_info  *info = osd_oti_get(env);
361         struct inode            *inode;
362         struct lu_fid           *fid = &info->oti_fid3;
363         int                      rc;
364         ENTRY;
365
366         OBD_ALLOC_PTR(dev->od_ost_map);
367         if (dev->od_ost_map == NULL)
368                 RETURN(-ENOMEM);
369
370         /* to get subdir count from last_rcvd */
371         rc = osd_last_rcvd_subdir_count(dev);
372         if (rc < 0)
373                 GOTO(cleanup_alloc, rc);
374
375         dev->od_ost_map->om_subdir_count = rc;
376         rc = 0;
377
378         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
379         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
380         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
381
382         osd_push_ctxt(dev, &new, &save);
383
384         d = ll_lookup_one_len("O", rootd, strlen("O"));
385         if (IS_ERR(d))
386                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
387         if (d->d_inode == NULL) {
388                 dput(d);
389                 /* The lookup() may be called again inside simple_mkdir().
390                  * Since the repeated lookup() only be called for "/O" at
391                  * mount time, it will not affect the whole performance. */
392                 d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
393                 if (IS_ERR(d))
394                         GOTO(cleanup_ctxt, rc = PTR_ERR(d));
395
396                 /* It is quite probably that the device is new formatted. */
397                 dev->od_maybe_new = 1;
398         }
399
400         inode = d->d_inode;
401         dev->od_ost_map->om_root = d;
402
403         /* 'What the @fid is' is not imporatant, because the object
404          * has no OI mapping, and only is visible inside the OSD.*/
405         lu_igif_build(fid, inode->i_ino, inode->i_generation);
406         rc = osd_ea_fid_set(info, inode, fid,
407                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
408         if (rc)
409                 GOTO(cleanup_dentry, rc);
410
411         pop_ctxt(&save, &new);
412         RETURN(0);
413
414 cleanup_dentry:
415         dput(d);
416 cleanup_ctxt:
417         pop_ctxt(&save, &new);
418 cleanup_alloc:
419         OBD_FREE_PTR(dev->od_ost_map);
420         return rc;
421 }
422
423 static void osd_seq_free(struct osd_obj_map *map,
424                          struct osd_obj_seq *osd_seq)
425 {
426         int j;
427
428         list_del_init(&osd_seq->oos_seq_list);
429
430         if (osd_seq->oos_dirs) {
431                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
432                         if (osd_seq->oos_dirs[j])
433                                 dput(osd_seq->oos_dirs[j]);
434                 }
435                 OBD_FREE(osd_seq->oos_dirs,
436                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
437         }
438
439         if (osd_seq->oos_root)
440                 dput(osd_seq->oos_root);
441
442         OBD_FREE_PTR(osd_seq);
443 }
444
445 static void osd_ost_fini(struct osd_device *osd)
446 {
447         struct osd_obj_seq    *osd_seq;
448         struct osd_obj_seq    *tmp;
449         struct osd_obj_map    *map = osd->od_ost_map;
450         ENTRY;
451
452         if (map == NULL)
453                 return;
454
455         write_lock(&map->om_seq_list_lock);
456         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
457                                  oos_seq_list) {
458                 osd_seq_free(map, osd_seq);
459         }
460         write_unlock(&map->om_seq_list_lock);
461         if (map->om_root)
462                 dput(map->om_root);
463         OBD_FREE_PTR(map);
464         osd->od_ost_map = NULL;
465         EXIT;
466 }
467
468 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
469 {
470         int rc;
471         ENTRY;
472
473         /* prepare structures for OST */
474         rc = osd_ost_init(env, dev);
475         if (rc)
476                 RETURN(rc);
477
478         /* prepare structures for MDS */
479         rc = osd_mdt_init(env, dev);
480         if (rc)
481                 osd_ost_fini(dev);
482
483         RETURN(rc);
484 }
485
486 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
487 {
488         struct osd_obj_seq *osd_seq;
489
490         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
491                 if (osd_seq->oos_seq == seq)
492                         return osd_seq;
493         }
494         return NULL;
495 }
496
497 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
498 {
499         struct osd_obj_seq *osd_seq;
500
501         read_lock(&map->om_seq_list_lock);
502         osd_seq = osd_seq_find_locked(map, seq);
503         read_unlock(&map->om_seq_list_lock);
504         return osd_seq;
505 }
506
507 void osd_obj_map_fini(struct osd_device *dev)
508 {
509         osd_ost_fini(dev);
510         osd_mdt_fini(dev);
511 }
512
513 /**
514  * Update the specified OI mapping.
515  *
516  * \retval   1, changed nothing
517  * \retval   0, changed successfully
518  * \retval -ve, on error
519  */
520 static int osd_obj_update_entry(struct osd_thread_info *info,
521                                 struct osd_device *osd,
522                                 struct dentry *dir, const char *name,
523                                 const struct lu_fid *fid,
524                                 const struct osd_inode_id *id,
525                                 handle_t *th)
526 {
527         struct inode               *parent = dir->d_inode;
528         struct dentry              *child;
529         struct ldiskfs_dir_entry_2 *de;
530         struct buffer_head         *bh;
531         struct inode               *inode;
532         struct dentry              *dentry = &info->oti_obj_dentry;
533         struct osd_inode_id        *oi_id  = &info->oti_id3;
534         struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
535         struct lu_fid              *oi_fid = &lma->lma_self_fid;
536         int                         rc;
537         ENTRY;
538
539         LASSERT(th != NULL);
540         LASSERT(th->h_transaction != NULL);
541
542         child = &info->oti_child_dentry;
543         child->d_parent = dir;
544         child->d_name.hash = 0;
545         child->d_name.name = name;
546         child->d_name.len = strlen(name);
547
548         ll_vfs_dq_init(parent);
549         mutex_lock(&parent->i_mutex);
550         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
551         if (bh == NULL)
552                 GOTO(out, rc = -ENOENT);
553
554         if (le32_to_cpu(de->inode) == id->oii_ino)
555                 GOTO(out, rc = 1);
556
557         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
558         inode = osd_iget(info, osd, oi_id);
559         if (IS_ERR(inode)) {
560                 rc = PTR_ERR(inode);
561                 if (rc == -ENOENT || rc == -ESTALE)
562                         goto update;
563                 GOTO(out, rc);
564         }
565
566         /* The EA inode should NOT be in OI, old OI scrub may added
567          * such OI mapping by wrong, replace it. */
568         if (unlikely(osd_is_ea_inode(inode))) {
569                 iput(inode);
570                 goto update;
571         }
572
573         rc = osd_get_lma(info, inode, dentry, lma);
574         if (rc == -ENODATA) {
575                 rc = osd_get_idif(info, inode, dentry, oi_fid);
576                 if (rc > 0 || rc == -ENODATA) {
577                         oi_fid = NULL;
578                         rc = 0;
579                 }
580         }
581         iput(inode);
582
583         if (rc != 0)
584                 GOTO(out, rc);
585
586         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
587          * either a crashed object or a uninitialized one. Replace it. */
588         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
589                 CERROR("%s: the FID "DFID" is used by two objects: "
590                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
591                        oi_id->oii_ino, oi_id->oii_gen,
592                        id->oii_ino, id->oii_gen);
593                 GOTO(out, rc = -EEXIST);
594         }
595
596         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
597                 __u32 idx1 = fid_idif_ost_idx(fid);
598                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
599                 struct ost_id *ostid = &info->oti_ostid;
600                 struct lu_fid *tfid = &info->oti_fid3;
601
602                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
603                          "invalid given FID "DFID", not match the "
604                          "device index %u\n", PFID(fid), osd->od_index);
605
606                 if (idx1 != idx2) {
607                         if (idx1 == 0 && idx2 == osd->od_index) {
608                                 fid_to_ostid(fid, ostid);
609                                 ostid_to_fid(tfid, ostid, idx2);
610                                 if (lu_fid_eq(tfid, oi_fid)) {
611                                         CERROR("%s: the FID "DFID" is used by "
612                                                "two objects(2): %u/%u %u/%u\n",
613                                                osd_name(osd), PFID(fid),
614                                                oi_id->oii_ino, oi_id->oii_gen,
615                                                id->oii_ino, id->oii_gen);
616
617                                         GOTO(out, rc = -EEXIST);
618                                 }
619                         } else if (idx2 == 0 && idx1 == osd->od_index) {
620                                 fid_to_ostid(oi_fid, ostid);
621                                 ostid_to_fid(tfid, ostid, idx1);
622                                 if (lu_fid_eq(tfid, fid)) {
623                                         CERROR("%s: the FID "DFID" is used by "
624                                                "two objects(2): %u/%u %u/%u\n",
625                                                osd_name(osd), PFID(fid),
626                                                oi_id->oii_ino, oi_id->oii_gen,
627                                                id->oii_ino, id->oii_gen);
628
629                                         GOTO(out, rc = -EEXIST);
630                                 }
631                         }
632                 }
633         }
634
635 update:
636         /* There may be temporary inconsistency: On one hand, the new
637          * object may be referenced by multiple entries, which is out
638          * of our control unless we traverse the whole /O completely,
639          * which is non-flat order and inefficient, should be avoided;
640          * On the other hand, the old object may become orphan if it
641          * is still valid. Since it was referenced by an invalid entry,
642          * making it as invisible temporary may be not worse. OI scrub
643          * will process it later. */
644         rc = ldiskfs_journal_get_write_access(th, bh);
645         if (rc != 0)
646                 GOTO(out, rc);
647
648         de->inode = cpu_to_le32(id->oii_ino);
649         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
650
651         GOTO(out, rc);
652
653 out:
654         brelse(bh);
655         mutex_unlock(&parent->i_mutex);
656         return rc;
657 }
658
659 static int osd_obj_del_entry(struct osd_thread_info *info,
660                              struct osd_device *osd,
661                              struct dentry *dird, char *name,
662                              handle_t *th)
663 {
664         struct ldiskfs_dir_entry_2 *de;
665         struct buffer_head         *bh;
666         struct dentry              *child;
667         struct inode               *dir = dird->d_inode;
668         int                         rc;
669         ENTRY;
670
671         LASSERT(th != NULL);
672         LASSERT(th->h_transaction != NULL);
673
674
675         child = &info->oti_child_dentry;
676         child->d_name.hash = 0;
677         child->d_name.name = name;
678         child->d_name.len = strlen(name);
679         child->d_parent = dird;
680         child->d_inode = NULL;
681
682         ll_vfs_dq_init(dir);
683         mutex_lock(&dir->i_mutex);
684         rc = -ENOENT;
685         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
686         if (bh) {
687                 rc = ldiskfs_delete_entry(th, dir, de, bh);
688                 brelse(bh);
689         }
690         mutex_unlock(&dir->i_mutex);
691
692         RETURN(rc);
693 }
694
695 static int osd_obj_add_entry(struct osd_thread_info *info,
696                              struct osd_device *osd,
697                              struct dentry *dir, char *name,
698                              const struct osd_inode_id *id,
699                              handle_t *th)
700 {
701         struct dentry *child;
702         struct inode *inode;
703         int rc;
704
705         ENTRY;
706
707         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
708                 RETURN(0);
709
710         LASSERT(th != NULL);
711         LASSERT(th->h_transaction != NULL);
712
713         inode = info->oti_inode;
714         if (unlikely(inode == NULL)) {
715                 struct ldiskfs_inode_info *lii;
716                 OBD_ALLOC_PTR(lii);
717                 if (lii == NULL)
718                         RETURN(-ENOMEM);
719                 inode = info->oti_inode = &lii->vfs_inode;
720         }
721
722         inode->i_sb = osd_sb(osd);
723         osd_id_to_inode(inode, id);
724         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
725
726         child = &info->oti_child_dentry;
727         child->d_name.hash = 0;
728         child->d_name.name = name;
729         child->d_name.len = strlen(name);
730         child->d_parent = dir;
731         child->d_inode = inode;
732
733         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
734                 inode->i_ino++;
735
736         ll_vfs_dq_init(dir->d_inode);
737         mutex_lock(&dir->d_inode->i_mutex);
738         rc = osd_ldiskfs_add_entry(th, child, inode, NULL);
739         mutex_unlock(&dir->d_inode->i_mutex);
740
741         RETURN(rc);
742 }
743
744 /**
745  * Use LPU64 for legacy OST sequences, but use LPX64i for new
746  * sequences names, so that the O/{seq}/dN/{oid} more closely
747  * follows the DFID/PFID format. This makes it easier to map from
748  * debug messages to objects in the future, and the legacy space
749  * of FID_SEQ_OST_MDT0 will be unused in the future.
750  **/
751 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
752 {
753         snprintf(seq_name, name_size,
754                  (fid_seq_is_rsvd(seq) ||
755                   fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
756                  fid_seq_is_idif(seq) ? 0 : seq);
757 }
758
759 static inline void osd_oid_name(char *name, size_t name_size,
760                                 const struct lu_fid *fid, u64 id)
761 {
762         snprintf(name, name_size,
763                  (fid_seq_is_rsvd(fid_seq(fid)) ||
764                   fid_seq_is_mdt0(fid_seq(fid)) ||
765                   fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
766 }
767
768 /* external locking is required */
769 static int osd_seq_load_locked(struct osd_thread_info *info,
770                                struct osd_device *osd,
771                                struct osd_obj_seq *osd_seq)
772 {
773         struct osd_obj_map  *map = osd->od_ost_map;
774         struct dentry       *seq_dir;
775         struct inode        *inode;
776         struct lu_fid       *fid = &info->oti_fid3;
777         int                 rc = 0;
778         int                 i;
779         char                dir_name[32];
780         ENTRY;
781
782         if (osd_seq->oos_root != NULL)
783                 RETURN(0);
784
785         LASSERT(map);
786         LASSERT(map->om_root);
787
788         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
789
790         seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
791         if (IS_ERR(seq_dir))
792                 GOTO(out_err, rc = PTR_ERR(seq_dir));
793         else if (seq_dir->d_inode == NULL)
794                 GOTO(out_put, rc = -EFAULT);
795
796         inode = seq_dir->d_inode;
797         osd_seq->oos_root = seq_dir;
798
799         /* 'What the @fid is' is not imporatant, because the object
800          * has no OI mapping, and only is visible inside the OSD.*/
801         lu_igif_build(fid, inode->i_ino, inode->i_generation);
802         rc = osd_ea_fid_set(info, inode, fid,
803                             LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
804         if (rc != 0)
805                 GOTO(out_put, rc);
806
807         LASSERT(osd_seq->oos_dirs == NULL);
808         OBD_ALLOC(osd_seq->oos_dirs,
809                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
810         if (osd_seq->oos_dirs == NULL)
811                 GOTO(out_put, rc = -ENOMEM);
812
813         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
814                 struct dentry   *dir;
815
816                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
817                 dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
818                                    0700, 1);
819                 if (IS_ERR(dir)) {
820                         GOTO(out_free, rc = PTR_ERR(dir));
821                 } else if (dir->d_inode == NULL) {
822                         dput(dir);
823                         GOTO(out_free, rc = -EFAULT);
824                 }
825
826                 inode = dir->d_inode;
827                 osd_seq->oos_dirs[i] = dir;
828
829                 /* 'What the @fid is' is not imporatant, because the object
830                  * has no OI mapping, and only is visible inside the OSD.*/
831                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
832                 rc = osd_ea_fid_set(info, inode, fid,
833                                     LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0);
834                 if (rc != 0)
835                         GOTO(out_free, rc);
836         }
837
838         if (rc != 0) {
839 out_free:
840                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
841                         if (osd_seq->oos_dirs[i] != NULL)
842                                 dput(osd_seq->oos_dirs[i]);
843                 }
844                 OBD_FREE(osd_seq->oos_dirs,
845                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
846 out_put:
847                 dput(seq_dir);
848                 osd_seq->oos_root = NULL;
849         }
850 out_err:
851         RETURN(rc);
852 }
853
854 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
855                                         struct osd_device *osd, u64 seq)
856 {
857         struct osd_obj_map      *map;
858         struct osd_obj_seq      *osd_seq;
859         int                     rc = 0;
860         ENTRY;
861
862         map = osd->od_ost_map;
863         LASSERT(map);
864         LASSERT(map->om_root);
865
866         osd_seq = osd_seq_find(map, seq);
867         if (likely(osd_seq != NULL))
868                 RETURN(osd_seq);
869
870         /* Serializing init process */
871         mutex_lock(&map->om_dir_init_mutex);
872
873         /* Check whether the seq has been added */
874         read_lock(&map->om_seq_list_lock);
875         osd_seq = osd_seq_find_locked(map, seq);
876         if (osd_seq != NULL) {
877                 read_unlock(&map->om_seq_list_lock);
878                 GOTO(cleanup, rc = 0);
879         }
880         read_unlock(&map->om_seq_list_lock);
881
882         OBD_ALLOC_PTR(osd_seq);
883         if (osd_seq == NULL)
884                 GOTO(cleanup, rc = -ENOMEM);
885
886         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
887         osd_seq->oos_seq = seq;
888         /* Init subdir count to be 32, but each seq can have
889          * different subdir count */
890         osd_seq->oos_subdir_count = map->om_subdir_count;
891         rc = osd_seq_load_locked(info, osd, osd_seq);
892         if (rc != 0)
893                 GOTO(cleanup, rc);
894
895         write_lock(&map->om_seq_list_lock);
896         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
897         write_unlock(&map->om_seq_list_lock);
898
899 cleanup:
900         mutex_unlock(&map->om_dir_init_mutex);
901         if (rc != 0) {
902                 if (osd_seq != NULL)
903                         OBD_FREE_PTR(osd_seq);
904                 RETURN(ERR_PTR(rc));
905         }
906
907         RETURN(osd_seq);
908 }
909
910 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
911                        const struct lu_fid *fid, struct osd_inode_id *id)
912 {
913         struct osd_obj_map              *map;
914         struct osd_obj_seq              *osd_seq;
915         struct dentry                   *d_seq;
916         struct dentry                   *child;
917         struct ost_id                   *ostid = &info->oti_ostid;
918         int                             dirn;
919         char                            name[32];
920         struct ldiskfs_dir_entry_2      *de;
921         struct buffer_head              *bh;
922         struct inode                    *dir;
923         struct inode                    *inode;
924         ENTRY;
925
926         /* on the very first lookup we find and open directories */
927
928         map = dev->od_ost_map;
929         LASSERT(map);
930         LASSERT(map->om_root);
931
932         fid_to_ostid(fid, ostid);
933         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
934         if (IS_ERR(osd_seq))
935                 RETURN(PTR_ERR(osd_seq));
936
937         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
938         d_seq = osd_seq->oos_dirs[dirn];
939         LASSERT(d_seq);
940
941         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
942
943         child = &info->oti_child_dentry;
944         child->d_parent = d_seq;
945         child->d_name.hash = 0;
946         child->d_name.name = name;
947         /* XXX: we can use rc from sprintf() instead of strlen() */
948         child->d_name.len = strlen(name);
949
950         dir = d_seq->d_inode;
951         mutex_lock(&dir->i_mutex);
952         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
953         mutex_unlock(&dir->i_mutex);
954
955         if (bh == NULL)
956                 RETURN(-ENOENT);
957
958         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
959         brelse(bh);
960
961         inode = osd_iget(info, dev, id);
962         if (IS_ERR(inode)) {
963                 int rc = PTR_ERR(inode);
964
965                 RETURN(rc == -ENOENT ? -ESTALE : rc);
966         }
967
968         iput(inode);
969         RETURN(0);
970 }
971
972 int osd_obj_map_insert(struct osd_thread_info *info,
973                        struct osd_device *osd,
974                        const struct lu_fid *fid,
975                        const struct osd_inode_id *id,
976                        handle_t *th)
977 {
978         struct osd_obj_map      *map;
979         struct osd_obj_seq      *osd_seq;
980         struct dentry           *d;
981         struct ost_id           *ostid = &info->oti_ostid;
982         u64                      oid;
983         int                     dirn, rc = 0;
984         char                    name[32];
985         ENTRY;
986
987         map = osd->od_ost_map;
988         LASSERT(map);
989
990         /* map fid to seq:objid */
991         fid_to_ostid(fid, ostid);
992
993         oid = ostid_id(ostid);
994         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
995         if (IS_ERR(osd_seq))
996                 RETURN(PTR_ERR(osd_seq));
997
998         dirn = oid & (osd_seq->oos_subdir_count - 1);
999         d = osd_seq->oos_dirs[dirn];
1000         LASSERT(d);
1001
1002         osd_oid_name(name, sizeof(name), fid, oid);
1003
1004 again:
1005         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1006         if (rc == -EEXIST) {
1007                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1008                 if (unlikely(rc == -ENOENT))
1009                         goto again;
1010
1011                 if (unlikely(rc == 1))
1012                         RETURN(0);
1013         }
1014
1015         RETURN(rc);
1016 }
1017
1018 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1019                        const struct lu_fid *fid, handle_t *th)
1020 {
1021         struct osd_obj_map      *map;
1022         struct osd_obj_seq      *osd_seq;
1023         struct dentry           *d;
1024         struct ost_id           *ostid = &info->oti_ostid;
1025         int                     dirn, rc = 0;
1026         char                    name[32];
1027         ENTRY;
1028
1029         map = osd->od_ost_map;
1030         LASSERT(map);
1031
1032         /* map fid to seq:objid */
1033         fid_to_ostid(fid, ostid);
1034
1035         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1036         if (IS_ERR(osd_seq))
1037                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1038
1039         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1040         d = osd_seq->oos_dirs[dirn];
1041         LASSERT(d);
1042
1043         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1044         rc = osd_obj_del_entry(info, osd, d, name, th);
1045 cleanup:
1046         RETURN(rc);
1047 }
1048
1049 int osd_obj_map_update(struct osd_thread_info *info,
1050                        struct osd_device *osd,
1051                        const struct lu_fid *fid,
1052                        const struct osd_inode_id *id,
1053                        handle_t *th)
1054 {
1055         struct osd_obj_seq      *osd_seq;
1056         struct dentry           *d;
1057         struct ost_id           *ostid = &info->oti_ostid;
1058         int                     dirn, rc = 0;
1059         char                    name[32];
1060         ENTRY;
1061
1062         fid_to_ostid(fid, ostid);
1063         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1064         if (IS_ERR(osd_seq))
1065                 RETURN(PTR_ERR(osd_seq));
1066
1067         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1068         d = osd_seq->oos_dirs[dirn];
1069         LASSERT(d);
1070
1071         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1072         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1073
1074         RETURN(rc);
1075 }
1076
1077 int osd_obj_map_recover(struct osd_thread_info *info,
1078                         struct osd_device *osd,
1079                         struct inode *src_parent,
1080                         struct dentry *src_child,
1081                         const struct lu_fid *fid)
1082 {
1083         struct osd_obj_seq         *osd_seq;
1084         struct dentry              *tgt_parent;
1085         struct dentry              *tgt_child = &info->oti_child_dentry;
1086         struct inode               *dir;
1087         struct inode               *inode     = src_child->d_inode;
1088         struct ost_id              *ostid     = &info->oti_ostid;
1089         handle_t                   *jh;
1090         struct ldiskfs_dir_entry_2 *de;
1091         struct buffer_head         *bh;
1092         char                        name[32];
1093         int                         dirn;
1094         int                         rc        = 0;
1095         ENTRY;
1096
1097         if (fid_is_last_id(fid)) {
1098                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1099                 if (IS_ERR(osd_seq))
1100                         RETURN(PTR_ERR(osd_seq));
1101
1102                 tgt_parent = osd_seq->oos_root;
1103                 tgt_child->d_name.name = "LAST_ID";
1104                 tgt_child->d_name.len = strlen("LAST_ID");
1105         } else {
1106                 fid_to_ostid(fid, ostid);
1107                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1108                 if (IS_ERR(osd_seq))
1109                         RETURN(PTR_ERR(osd_seq));
1110
1111                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1112                 tgt_parent = osd_seq->oos_dirs[dirn];
1113                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1114                 tgt_child->d_name.name = name;
1115                 tgt_child->d_name.len = strlen(name);
1116         }
1117         LASSERT(tgt_parent != NULL);
1118
1119         dir = tgt_parent->d_inode;
1120         tgt_child->d_name.hash = 0;
1121         tgt_child->d_parent = tgt_parent;
1122         tgt_child->d_inode = inode;
1123
1124         /* The non-initialized src_child may be destroyed. */
1125         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1126                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1127                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1128                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1129         if (IS_ERR(jh))
1130                 RETURN(PTR_ERR(jh));
1131
1132         ll_vfs_dq_init(src_parent);
1133         ll_vfs_dq_init(dir);
1134
1135         mutex_lock(&src_parent->i_mutex);
1136         mutex_lock(&dir->i_mutex);
1137         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1138         if (bh != NULL) {
1139                 /* XXX: If some other object occupied the same slot. And If such
1140                  *      inode is zero-sized and with SUID+SGID, then means it is
1141                  *      a new created one. Maybe we can remove it and insert the
1142                  *      original one back to the /O/<seq>/d<x>. But there are
1143                  *      something to be considered:
1144                  *
1145                  *      1) The OST-object under /lost+found has crashed LMA.
1146                  *         So it should not conflict with the current one.
1147                  *
1148                  *      2) There are race conditions that: someone may just want
1149                  *         to modify the current one. Even if the OI scrub takes
1150                  *         the object lock when remove the current one, it still
1151                  *         cause the modification to be lost becasue the target
1152                  *         has been removed when the RPC service thread waiting
1153                  *         for the lock.
1154                  *
1155                  *      So keep it there before we have suitable solution. */
1156                 brelse(bh);
1157                 mutex_unlock(&dir->i_mutex);
1158                 mutex_unlock(&src_parent->i_mutex);
1159                 ldiskfs_journal_stop(jh);
1160
1161                 rc = -EEXIST;
1162                 /* If the src object has never been modified, then remove it. */
1163                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1164                     inode->i_mode & S_ISGID) {
1165                         rc = ll_vfs_unlink(src_parent, src_child);
1166                         if (unlikely(rc == -ENOENT))
1167                                 rc = 0;
1168                 }
1169                 RETURN(rc);
1170         }
1171
1172         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1173                                     NULL, NULL);
1174         if (unlikely(bh == NULL))
1175                 GOTO(unlock, rc = -ENOENT);
1176
1177         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1178         brelse(bh);
1179         if (rc != 0)
1180                 GOTO(unlock, rc);
1181
1182         rc = osd_ldiskfs_add_entry(jh, tgt_child, inode, NULL);
1183
1184         GOTO(unlock, rc);
1185
1186 unlock:
1187         mutex_unlock(&dir->i_mutex);
1188         mutex_unlock(&src_parent->i_mutex);
1189         ldiskfs_journal_stop(jh);
1190         return rc;
1191 }
1192
1193 static struct dentry *
1194 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1195                      const struct lu_fid *fid, char **name)
1196 {
1197         struct dentry *root = ERR_PTR(-ENOENT);
1198
1199         if (fid_is_last_id(fid)) {
1200                 struct osd_obj_seq *osd_seq;
1201
1202                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1203                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1204                 if (IS_ERR(osd_seq))
1205                         RETURN((struct dentry *)osd_seq);
1206
1207                 *name = "LAST_ID";
1208                 root = osd_seq->oos_root;
1209         } else {
1210                 *name = osd_lf_fid2name(fid);
1211                 if (*name == NULL)
1212                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1213                 else if ((*name)[0])
1214                         root = osd_sb(osd)->s_root;
1215         }
1216
1217         return root;
1218 }
1219
1220 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1221                         const struct lu_fid *fid, const struct osd_inode_id *id,
1222                         handle_t *th)
1223 {
1224         struct dentry   *root;
1225         char            *name = NULL;
1226         int              rc;
1227         ENTRY;
1228
1229         root = osd_object_spec_find(info, osd, fid, &name);
1230         if (!IS_ERR(root)) {
1231                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1232         } else {
1233                 rc = PTR_ERR(root);
1234                 if (rc == -ENOENT)
1235                         rc = 1;
1236         }
1237
1238         RETURN(rc);
1239 }
1240
1241 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1242                         const struct lu_fid *fid, const struct osd_inode_id *id,
1243                         handle_t *th)
1244 {
1245         struct dentry   *root;
1246         char            *name = NULL;
1247         int              rc;
1248         ENTRY;
1249
1250         root = osd_object_spec_find(info, osd, fid, &name);
1251         if (!IS_ERR(root)) {
1252                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1253         } else {
1254                 rc = PTR_ERR(root);
1255                 if (rc == -ENOENT)
1256                         rc = 0;
1257         }
1258
1259         RETURN(rc);
1260 }
1261
1262 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1263                         const struct lu_fid *fid, struct osd_inode_id *id)
1264 {
1265         struct dentry   *root;
1266         struct dentry   *dentry;
1267         struct inode    *inode;
1268         char            *name = NULL;
1269         int             rc = -ENOENT;
1270         ENTRY;
1271
1272         if (fid_is_last_id(fid)) {
1273                 struct osd_obj_seq *osd_seq;
1274
1275                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1276                 if (IS_ERR(osd_seq))
1277                         RETURN(PTR_ERR(osd_seq));
1278                 root = osd_seq->oos_root;
1279                 name = "LAST_ID";
1280         } else {
1281                 root = osd_sb(osd)->s_root;
1282                 name = osd_lf_fid2name(fid);
1283                 if (name == NULL || strlen(name) == 0)
1284                         RETURN(-ENOENT);
1285         }
1286
1287         dentry = ll_lookup_one_len(name, root, strlen(name));
1288         if (!IS_ERR(dentry)) {
1289                 inode = dentry->d_inode;
1290                 if (inode) {
1291                         if (is_bad_inode(inode)) {
1292                                 rc = -EIO;
1293                         } else {
1294                                 osd_id_gen(id, inode->i_ino,
1295                                            inode->i_generation);
1296                                 rc = 0;
1297                         }
1298                 }
1299                 /* if dentry is accessible after osd_compat_spec_insert it
1300                  * will still contain NULL inode, so don't keep it in cache */
1301                 d_invalidate(dentry);
1302                 dput(dentry);
1303         }
1304
1305         RETURN(rc);
1306 }