4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details. A copy is
14 * included in the COPYING file that accompanied this code.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Copyright (c) 2012, 2013, Intel Corporation.
26 * lustre/obdclass/local_storage.c
28 * Local storage for file/objects with fid generation. Works on top of OSD.
30 * Author: Mikhail Pershin <mike.pershin@intel.com>
33 #define DEBUG_SUBSYSTEM S_CLASS
35 #include "local_storage.h"
37 /* all initialized local storages on this node are linked on this */
38 static CFS_LIST_HEAD(ls_list_head);
39 static DEFINE_MUTEX(ls_list_mutex);
41 static int ls_object_init(const struct lu_env *env, struct lu_object *o,
42 const struct lu_object_conf *unused)
45 struct lu_object *below;
46 struct lu_device *under;
50 ls = container_of0(o->lo_dev, struct ls_device, ls_top_dev.dd_lu_dev);
51 under = &ls->ls_osd->dd_lu_dev;
52 below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
56 lu_object_add(o, below);
61 static void ls_object_free(const struct lu_env *env, struct lu_object *o)
63 struct ls_object *obj = lu2ls_obj(o);
64 struct lu_object_header *h = o->lo_header;
66 dt_object_fini(&obj->ls_obj);
67 lu_object_header_fini(h);
71 struct lu_object_operations ls_lu_obj_ops = {
72 .loo_object_init = ls_object_init,
73 .loo_object_free = ls_object_free,
76 struct lu_object *ls_object_alloc(const struct lu_env *env,
77 const struct lu_object_header *_h,
80 struct lu_object_header *h;
91 lu_object_header_init(h);
92 dt_object_init(&o->ls_obj, h, d);
93 lu_object_add_top(h, l);
95 l->lo_ops = &ls_lu_obj_ops;
103 static struct lu_device_operations ls_lu_dev_ops = {
104 .ldo_object_alloc = ls_object_alloc
107 static struct ls_device *__ls_find_dev(struct dt_device *dev)
109 struct ls_device *ls, *ret = NULL;
111 cfs_list_for_each_entry(ls, &ls_list_head, ls_linkage) {
112 if (ls->ls_osd == dev) {
113 atomic_inc(&ls->ls_refcount);
121 struct ls_device *ls_find_dev(struct dt_device *dev)
123 struct ls_device *ls;
125 mutex_lock(&ls_list_mutex);
126 ls = __ls_find_dev(dev);
127 mutex_unlock(&ls_list_mutex);
132 static struct lu_device_type_operations ls_device_type_ops = {
137 static struct lu_device_type ls_lu_type = {
138 .ldt_name = "local_storage",
139 .ldt_ops = &ls_device_type_ops,
142 struct ls_device *ls_device_get(struct dt_device *dev)
144 struct ls_device *ls;
148 mutex_lock(&ls_list_mutex);
149 ls = __ls_find_dev(dev);
153 /* not found, then create */
156 GOTO(out_ls, ls = ERR_PTR(-ENOMEM));
158 atomic_set(&ls->ls_refcount, 1);
159 CFS_INIT_LIST_HEAD(&ls->ls_los_list);
160 mutex_init(&ls->ls_los_mutex);
164 LASSERT(dev->dd_lu_dev.ld_site);
165 lu_device_init(&ls->ls_top_dev.dd_lu_dev, &ls_lu_type);
166 ls->ls_top_dev.dd_lu_dev.ld_ops = &ls_lu_dev_ops;
167 ls->ls_top_dev.dd_lu_dev.ld_site = dev->dd_lu_dev.ld_site;
169 /* finally add ls to the list */
170 cfs_list_add(&ls->ls_linkage, &ls_list_head);
172 mutex_unlock(&ls_list_mutex);
176 void ls_device_put(const struct lu_env *env, struct ls_device *ls)
179 if (!atomic_dec_and_test(&ls->ls_refcount))
182 mutex_lock(&ls_list_mutex);
183 if (atomic_read(&ls->ls_refcount) == 0) {
184 LASSERT(cfs_list_empty(&ls->ls_los_list));
185 cfs_list_del(&ls->ls_linkage);
186 lu_site_purge(env, ls->ls_top_dev.dd_lu_dev.ld_site, ~0);
187 lu_device_fini(&ls->ls_top_dev.dd_lu_dev);
190 mutex_unlock(&ls_list_mutex);
194 * local file fid generation
196 int local_object_fid_generate(const struct lu_env *env,
197 struct local_oid_storage *los,
200 LASSERT(los->los_dev);
201 LASSERT(los->los_obj);
205 /* to make it unique after reboot we store
206 * the latest generated fid atomically with
207 * object creation see local_object_create() */
209 mutex_lock(&los->los_id_lock);
210 fid->f_seq = los->los_seq;
211 fid->f_oid = ++los->los_last_oid;
213 mutex_unlock(&los->los_id_lock);
218 int local_object_declare_create(const struct lu_env *env,
219 struct local_oid_storage *los,
220 struct dt_object *o, struct lu_attr *attr,
221 struct dt_object_format *dof,
224 struct dt_thread_info *dti = dt_info(env);
229 /* update fid generation file */
231 LASSERT(dt_object_exists(los->los_obj));
232 rc = dt_declare_record_write(env, los->los_obj,
233 sizeof(struct los_ondisk), 0, th);
238 rc = dt_declare_create(env, o, attr, NULL, dof, th);
242 dti->dti_lb.lb_buf = NULL;
243 dti->dti_lb.lb_len = sizeof(dti->dti_lma);
244 rc = dt_declare_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA, 0, th);
249 int local_object_create(const struct lu_env *env,
250 struct local_oid_storage *los,
251 struct dt_object *o, struct lu_attr *attr,
252 struct dt_object_format *dof, struct thandle *th)
254 struct dt_thread_info *dti = dt_info(env);
260 rc = dt_create(env, o, attr, NULL, dof, th);
267 LASSERT(los->los_obj);
268 LASSERT(dt_object_exists(los->los_obj));
270 /* many threads can be updated this, serialize
271 * them here to avoid the race where one thread
272 * takes the value first, but writes it last */
273 mutex_lock(&los->los_id_lock);
275 /* update local oid number on disk so that
276 * we know the last one used after reboot */
277 lastid = cpu_to_le64(los->los_last_oid);
280 dti->dti_lb.lb_buf = &lastid;
281 dti->dti_lb.lb_len = sizeof(lastid);
282 rc = dt_record_write(env, los->los_obj, &dti->dti_lb, &dti->dti_off,
284 mutex_unlock(&los->los_id_lock);
290 * Create local named object (file, directory or index) in parent directory.
292 struct dt_object *__local_file_create(const struct lu_env *env,
293 const struct lu_fid *fid,
294 struct local_oid_storage *los,
295 struct ls_device *ls,
296 struct dt_object *parent,
297 const char *name, struct lu_attr *attr,
298 struct dt_object_format *dof)
300 struct dt_thread_info *dti = dt_info(env);
301 struct lu_object_conf *conf = &dti->dti_conf;
302 struct dt_object *dto;
306 /* We know that the target object does not exist, to be created,
307 * then give some hints - LOC_F_NEW to help low layer to handle
308 * that efficiently and properly. */
309 memset(conf, 0, sizeof(*conf));
310 conf->loc_flags = LOC_F_NEW;
311 dto = ls_locate(env, ls, fid, conf);
312 if (unlikely(IS_ERR(dto)))
315 LASSERT(dto != NULL);
316 if (dt_object_exists(dto))
317 GOTO(out, rc = -EEXIST);
319 th = dt_trans_create(env, ls->ls_osd);
321 GOTO(out, rc = PTR_ERR(th));
323 rc = local_object_declare_create(env, los, dto, attr, dof, th);
325 GOTO(trans_stop, rc);
327 if (dti->dti_dof.dof_type == DFT_DIR) {
328 dt_declare_ref_add(env, dto, th);
329 dt_declare_ref_add(env, parent, th);
332 rc = dt_declare_insert(env, parent, (void *)fid, (void *)name, th);
334 GOTO(trans_stop, rc);
336 rc = dt_trans_start_local(env, ls->ls_osd, th);
338 GOTO(trans_stop, rc);
340 dt_write_lock(env, dto, 0);
341 if (dt_object_exists(dto))
342 GOTO(unlock, rc = 0);
344 CDEBUG(D_OTHER, "create new object "DFID"\n",
345 PFID(lu_object_fid(&dto->do_lu)));
346 rc = local_object_create(env, los, dto, attr, dof, th);
349 LASSERT(dt_object_exists(dto));
351 if (dti->dti_dof.dof_type == DFT_DIR) {
352 if (!dt_try_as_dir(env, dto))
353 GOTO(destroy, rc = -ENOTDIR);
354 /* Add "." and ".." for newly created dir */
355 rc = dt_insert(env, dto, (void *)fid, (void *)".", th,
359 dt_ref_add(env, dto, th);
360 rc = dt_insert(env, dto, (void *)lu_object_fid(&parent->do_lu),
361 (void *)"..", th, BYPASS_CAPA, 1);
366 dt_write_lock(env, parent, 0);
367 rc = dt_insert(env, parent, (const struct dt_rec *)fid,
368 (const struct dt_key *)name, th, BYPASS_CAPA, 1);
369 if (dti->dti_dof.dof_type == DFT_DIR)
370 dt_ref_add(env, parent, th);
371 dt_write_unlock(env, parent);
376 dt_destroy(env, dto, th);
378 dt_write_unlock(env, dto);
380 dt_trans_stop(env, ls->ls_osd, th);
383 lu_object_put_nocache(env, &dto->do_lu);
390 * Look up and create (if it does not exist) a local named file or directory in
393 struct dt_object *local_file_find_or_create(const struct lu_env *env,
394 struct local_oid_storage *los,
395 struct dt_object *parent,
396 const char *name, __u32 mode)
398 struct dt_thread_info *dti = dt_info(env);
399 struct dt_object *dto;
404 rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
406 /* name is found, get the object */
407 dto = ls_locate(env, dt2ls_dev(los->los_dev),
408 &dti->dti_fid, NULL);
409 else if (rc != -ENOENT)
412 rc = local_object_fid_generate(env, los, &dti->dti_fid);
416 /* create the object */
417 dti->dti_attr.la_valid = LA_MODE;
418 dti->dti_attr.la_mode = mode;
419 dti->dti_dof.dof_type = dt_mode_to_dft(mode & S_IFMT);
420 dto = __local_file_create(env, &dti->dti_fid, los,
421 dt2ls_dev(los->los_dev),
422 parent, name, &dti->dti_attr,
428 EXPORT_SYMBOL(local_file_find_or_create);
430 struct dt_object *local_file_find_or_create_with_fid(const struct lu_env *env,
431 struct dt_device *dt,
432 const struct lu_fid *fid,
433 struct dt_object *parent,
437 struct dt_thread_info *dti = dt_info(env);
438 struct dt_object *dto;
443 rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
445 dto = dt_locate(env, dt, &dti->dti_fid);
446 } else if (rc != -ENOENT) {
449 struct ls_device *ls;
451 ls = ls_device_get(dt);
453 dto = ERR_PTR(PTR_ERR(ls));
455 /* create the object */
456 dti->dti_attr.la_valid = LA_MODE;
457 dti->dti_attr.la_mode = mode;
458 dti->dti_dof.dof_type = dt_mode_to_dft(mode & S_IFMT);
459 dto = __local_file_create(env, fid, NULL, ls, parent,
460 name, &dti->dti_attr,
462 /* ls_device_put() will finalize the ls device, we
463 * have to open the object in other device stack */
465 dti->dti_fid = dto->do_lu.lo_header->loh_fid;
466 lu_object_put_nocache(env, &dto->do_lu);
467 dto = dt_locate(env, dt, &dti->dti_fid);
469 ls_device_put(env, ls);
474 EXPORT_SYMBOL(local_file_find_or_create_with_fid);
477 * Look up and create (if it does not exist) a local named index file in parent
480 struct dt_object *local_index_find_or_create(const struct lu_env *env,
481 struct local_oid_storage *los,
482 struct dt_object *parent,
483 const char *name, __u32 mode,
484 const struct dt_index_features *ft)
486 struct dt_thread_info *dti = dt_info(env);
487 struct dt_object *dto;
492 rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
494 /* name is found, get the object */
495 dto = ls_locate(env, dt2ls_dev(los->los_dev),
496 &dti->dti_fid, NULL);
497 } else if (rc != -ENOENT) {
500 rc = local_object_fid_generate(env, los, &dti->dti_fid);
504 /* create the object */
505 dti->dti_attr.la_valid = LA_MODE;
506 dti->dti_attr.la_mode = mode;
507 dti->dti_dof.dof_type = DFT_INDEX;
508 dti->dti_dof.u.dof_idx.di_feat = ft;
509 dto = __local_file_create(env, &dti->dti_fid, los,
510 dt2ls_dev(los->los_dev),
511 parent, name, &dti->dti_attr,
518 EXPORT_SYMBOL(local_index_find_or_create);
521 local_index_find_or_create_with_fid(const struct lu_env *env,
522 struct dt_device *dt,
523 const struct lu_fid *fid,
524 struct dt_object *parent,
525 const char *name, __u32 mode,
526 const struct dt_index_features *ft)
528 struct dt_thread_info *dti = dt_info(env);
529 struct dt_object *dto;
534 rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
536 /* name is found, get the object */
537 if (!lu_fid_eq(fid, &dti->dti_fid))
538 dto = ERR_PTR(-EINVAL);
540 dto = dt_locate(env, dt, fid);
541 } else if (rc != -ENOENT) {
544 struct ls_device *ls;
546 ls = ls_device_get(dt);
548 dto = ERR_PTR(PTR_ERR(ls));
550 /* create the object */
551 dti->dti_attr.la_valid = LA_MODE;
552 dti->dti_attr.la_mode = mode;
553 dti->dti_dof.dof_type = DFT_INDEX;
554 dti->dti_dof.u.dof_idx.di_feat = ft;
555 dto = __local_file_create(env, fid, NULL, ls, parent,
556 name, &dti->dti_attr,
558 /* ls_device_put() will finalize the ls device, we
559 * have to open the object in other device stack */
561 dti->dti_fid = dto->do_lu.lo_header->loh_fid;
562 lu_object_put_nocache(env, &dto->do_lu);
563 dto = dt_locate(env, dt, &dti->dti_fid);
565 ls_device_put(env, ls);
570 EXPORT_SYMBOL(local_index_find_or_create_with_fid);
572 static int local_object_declare_unlink(const struct lu_env *env,
573 struct dt_device *dt,
575 struct dt_object *c, const char *name,
580 rc = dt_declare_delete(env, p, (const struct dt_key *)name, th);
584 rc = dt_declare_ref_del(env, c, th);
588 return dt_declare_destroy(env, c, th);
591 int local_object_unlink(const struct lu_env *env, struct dt_device *dt,
592 struct dt_object *parent, const char *name)
594 struct dt_thread_info *dti = dt_info(env);
595 struct dt_object *dto;
601 rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
607 dto = dt_locate(env, dt, &dti->dti_fid);
608 if (unlikely(IS_ERR(dto)))
609 RETURN(PTR_ERR(dto));
611 th = dt_trans_create(env, dt);
613 GOTO(out, rc = PTR_ERR(th));
615 rc = local_object_declare_unlink(env, dt, parent, dto, name, th);
619 rc = dt_trans_start_local(env, dt, th);
623 dt_write_lock(env, dto, 0);
624 rc = dt_delete(env, parent, (struct dt_key *)name, th, BYPASS_CAPA);
628 rc = dt_ref_del(env, dto, th);
630 rc = dt_insert(env, parent,
631 (const struct dt_rec *)&dti->dti_fid,
632 (const struct dt_key *)name, th, BYPASS_CAPA, 1);
636 rc = dt_destroy(env, dto, th);
638 dt_write_unlock(env, dto);
640 dt_trans_stop(env, dt, th);
642 lu_object_put_nocache(env, &dto->do_lu);
645 EXPORT_SYMBOL(local_object_unlink);
647 struct local_oid_storage *dt_los_find(struct ls_device *ls, __u64 seq)
649 struct local_oid_storage *los, *ret = NULL;
651 cfs_list_for_each_entry(los, &ls->ls_los_list, los_list) {
652 if (los->los_seq == seq) {
653 atomic_inc(&los->los_refcount);
661 void dt_los_put(struct local_oid_storage *los)
663 if (atomic_dec_and_test(&los->los_refcount))
664 /* should never happen, only local_oid_storage_fini should
665 * drop refcount to zero */
670 /* after Lustre 2.3 release there may be old file to store last generated FID
671 * If such file exists then we have to read its content
673 int lastid_compat_check(const struct lu_env *env, struct dt_device *dev,
674 __u64 lastid_seq, __u32 *first_oid, struct ls_device *ls)
676 struct dt_thread_info *dti = dt_info(env);
677 struct dt_object *root = NULL;
678 struct los_ondisk losd;
679 struct dt_object *o = NULL;
682 rc = dt_root_get(env, dev, &dti->dti_fid);
686 root = ls_locate(env, ls, &dti->dti_fid, NULL);
688 return PTR_ERR(root);
690 /* find old last_id file */
691 snprintf(dti->dti_buf, sizeof(dti->dti_buf), "seq-"LPX64"-lastid",
693 rc = dt_lookup_dir(env, root, dti->dti_buf, &dti->dti_fid);
694 lu_object_put_nocache(env, &root->do_lu);
696 struct lu_object_conf *conf = &dti->dti_conf;
698 /* old llog lastid accessed by FID only */
699 if (lastid_seq != FID_SEQ_LLOG)
701 dti->dti_fid.f_seq = FID_SEQ_LLOG;
702 dti->dti_fid.f_oid = 1;
703 dti->dti_fid.f_ver = 0;
704 memset(conf, 0, sizeof(*conf));
705 conf->loc_flags = LOC_F_NEW;
706 o = ls_locate(env, ls, &dti->dti_fid, conf);
710 if (!dt_object_exists(o)) {
711 lu_object_put_nocache(env, &o->do_lu);
714 CDEBUG(D_INFO, "Found old llog lastid file\n");
718 CDEBUG(D_INFO, "Found old lastid file for sequence "LPX64"\n",
720 o = ls_locate(env, ls, &dti->dti_fid, NULL);
724 /* let's read seq-NNNNNN-lastid file value */
725 LASSERT(dt_object_exists(o));
727 dti->dti_lb.lb_buf = &losd;
728 dti->dti_lb.lb_len = sizeof(losd);
729 dt_read_lock(env, o, 0);
730 rc = dt_record_read(env, o, &dti->dti_lb, &dti->dti_off);
731 dt_read_unlock(env, o);
732 lu_object_put_nocache(env, &o->do_lu);
733 if (rc == 0 && le32_to_cpu(losd.lso_magic) != LOS_MAGIC) {
734 CERROR("%s: wrong content of seq-"LPX64"-lastid file, magic %x\n",
735 o->do_lu.lo_dev->ld_obd->obd_name, lastid_seq,
736 le32_to_cpu(losd.lso_magic));
739 CERROR("%s: failed to read seq-"LPX64"-lastid: rc = %d\n",
740 o->do_lu.lo_dev->ld_obd->obd_name, lastid_seq, rc);
743 *first_oid = le32_to_cpu(losd.lso_next_oid);
748 * Initialize local OID storage for required sequence.
749 * That may be needed for services that uses local files and requires
750 * dynamic OID allocation for them.
752 * Per each sequence we have an object with 'first_fid' identificator
753 * containing the counter for OIDs of locally created files with that
756 * It is used now by llog subsystem and MGS for NID tables
758 * Function gets first_fid to create counter object.
759 * All dynamic fids will be generated with the same sequence and incremented
762 * Returned local_oid_storage is in-memory representaion of OID storage
764 int local_oid_storage_init(const struct lu_env *env, struct dt_device *dev,
765 const struct lu_fid *first_fid,
766 struct local_oid_storage **los)
768 struct dt_thread_info *dti = dt_info(env);
769 struct ls_device *ls;
771 struct dt_object *o = NULL;
773 __u32 first_oid = fid_oid(first_fid);
778 ls = ls_device_get(dev);
782 mutex_lock(&ls->ls_los_mutex);
783 *los = dt_los_find(ls, fid_seq(first_fid));
787 /* not found, then create */
790 GOTO(out, rc = -ENOMEM);
792 atomic_set(&(*los)->los_refcount, 1);
793 mutex_init(&(*los)->los_id_lock);
794 (*los)->los_dev = &ls->ls_top_dev;
795 atomic_inc(&ls->ls_refcount);
796 cfs_list_add(&(*los)->los_list, &ls->ls_los_list);
798 /* Use {seq, 0, 0} to create the LAST_ID file for every
799 * sequence. OIDs start at LUSTRE_FID_INIT_OID.
801 dti->dti_fid.f_seq = fid_seq(first_fid);
802 dti->dti_fid.f_oid = LUSTRE_FID_LASTID_OID;
803 dti->dti_fid.f_ver = 0;
804 o = ls_locate(env, ls, &dti->dti_fid, NULL);
806 GOTO(out_los, rc = PTR_ERR(o));
808 if (!dt_object_exists(o)) {
809 rc = lastid_compat_check(env, dev, fid_seq(first_fid),
814 th = dt_trans_create(env, dev);
816 GOTO(out_los, rc = PTR_ERR(th));
818 dti->dti_attr.la_valid = LA_MODE | LA_TYPE;
819 dti->dti_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
820 dti->dti_dof.dof_type = dt_mode_to_dft(S_IFREG);
822 rc = dt_declare_create(env, o, &dti->dti_attr, NULL,
827 rc = dt_declare_record_write(env, o, sizeof(lastid), 0, th);
831 rc = dt_trans_start_local(env, dev, th);
835 dt_write_lock(env, o, 0);
836 if (dt_object_exists(o))
837 GOTO(out_lock, rc = 0);
839 rc = dt_create(env, o, &dti->dti_attr, NULL, &dti->dti_dof,
844 lastid = cpu_to_le64(first_oid);
847 dti->dti_lb.lb_buf = &lastid;
848 dti->dti_lb.lb_len = sizeof(lastid);
849 rc = dt_record_write(env, o, &dti->dti_lb, &dti->dti_off, th);
853 dt_write_unlock(env, o);
855 dt_trans_stop(env, dev, th);
858 dti->dti_lb.lb_buf = &lastid;
859 dti->dti_lb.lb_len = sizeof(lastid);
860 dt_read_lock(env, o, 0);
861 rc = dt_record_read(env, o, &dti->dti_lb, &dti->dti_off);
862 dt_read_unlock(env, o);
863 if (rc == 0 && le64_to_cpu(lastid) > OBIF_MAX_OID) {
864 CERROR("%s: bad oid "LPU64" is read from LAST_ID\n",
865 o->do_lu.lo_dev->ld_obd->obd_name,
866 le64_to_cpu(lastid));
872 cfs_list_del(&(*los)->los_list);
873 atomic_dec(&ls->ls_refcount);
876 if (o != NULL && !IS_ERR(o))
877 lu_object_put_nocache(env, &o->do_lu);
879 (*los)->los_seq = fid_seq(first_fid);
880 (*los)->los_last_oid = le64_to_cpu(lastid);
882 /* Read value should not be less than initial one
883 * but possible after upgrade from older fs.
884 * In this case just switch to the first_oid in memory and
885 * it will be updated on disk with first object generated */
886 if ((*los)->los_last_oid < first_oid)
887 (*los)->los_last_oid = first_oid;
890 mutex_unlock(&ls->ls_los_mutex);
891 ls_device_put(env, ls);
894 EXPORT_SYMBOL(local_oid_storage_init);
896 void local_oid_storage_fini(const struct lu_env *env,
897 struct local_oid_storage *los)
899 struct ls_device *ls;
901 if (!atomic_dec_and_test(&los->los_refcount))
905 LASSERT(los->los_dev);
906 ls = dt2ls_dev(los->los_dev);
908 mutex_lock(&ls->ls_los_mutex);
909 if (atomic_read(&los->los_refcount) > 0) {
910 mutex_unlock(&ls->ls_los_mutex);
915 lu_object_put_nocache(env, &los->los_obj->do_lu);
916 cfs_list_del(&los->los_list);
918 mutex_unlock(&ls->ls_los_mutex);
919 ls_device_put(env, ls);
921 EXPORT_SYMBOL(local_oid_storage_fini);