1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre Metadata Server (MDS) filesystem interface code
7 * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
8 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 # define EXPORT_SYMTAB
29 #define DEBUG_SUBSYSTEM S_MDS
31 #include <linux/module.h>
32 #include <linux/kmod.h>
33 #include <linux/version.h>
34 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
35 #include <linux/mount.h>
37 #include <linux/lustre_mds.h>
38 #include <linux/obd_class.h>
39 #include <linux/obd_support.h>
40 #include <linux/lustre_lib.h>
41 #include <linux/lustre_fsfilt.h>
42 #include <portals/list.h>
44 #include "mds_internal.h"
46 /* This limit is arbitrary, but for now we fit it in 1 page (32k clients) */
47 #define MDS_MAX_CLIENTS (PAGE_SIZE * 8)
48 #define MDS_MAX_CLIENT_WORDS (MDS_MAX_CLIENTS / sizeof(unsigned long))
50 #define LAST_RCVD "last_rcvd"
51 #define LOV_OBJID "lov_objid"
53 /* Add client data to the MDS. We use a bitmap to locate a free space
54 * in the last_rcvd file if cl_off is -1 (i.e. a new client).
55 * Otherwise, we have just read the data from the last_rcvd file and
58 int mds_client_add(struct obd_device *obd, struct mds_obd *mds,
59 struct mds_export_data *med, int cl_idx)
61 unsigned long *bitmap = mds->mds_client_bitmap;
62 int new_client = (cl_idx == -1);
65 LASSERT(bitmap != NULL);
67 /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
68 if (!strcmp(med->med_mcd->mcd_uuid, obd->obd_uuid.uuid))
71 /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
72 * there's no need for extra complication here
75 cl_idx = find_first_zero_bit(bitmap, MDS_MAX_CLIENTS);
77 if (cl_idx >= MDS_MAX_CLIENTS) {
78 CERROR("no room for clients - fix MDS_MAX_CLIENTS\n");
81 if (test_and_set_bit(cl_idx, bitmap)) {
82 cl_idx = find_next_zero_bit(bitmap, MDS_MAX_CLIENTS,
87 if (test_and_set_bit(cl_idx, bitmap)) {
88 CERROR("MDS client %d: bit already set in bitmap!!\n",
94 CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
95 cl_idx, med->med_mcd->mcd_uuid);
97 med->med_idx = cl_idx;
98 med->med_off = MDS_LR_CLIENT_START + (cl_idx * MDS_LR_CLIENT_SIZE);
101 struct obd_run_ctxt saved;
102 loff_t off = med->med_off;
103 struct file *file = mds->mds_rcvd_filp;
106 push_ctxt(&saved, &obd->obd_ctxt, NULL);
107 rc = fsfilt_write_record(obd, file, med->med_mcd,
108 sizeof(*med->med_mcd), &off, 1);
109 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
113 CDEBUG(D_INFO, "wrote client mcd at idx %u off %llu (len %u)\n",
114 med->med_idx, med->med_off,
115 (unsigned int)sizeof(*med->med_mcd));
120 int mds_client_free(struct obd_export *exp, int clear_client)
122 struct mds_export_data *med = &exp->exp_mds_data;
123 struct mds_obd *mds = &exp->exp_obd->u.mds;
124 struct obd_device *obd = exp->exp_obd;
125 struct mds_client_data zero_mcd;
126 struct obd_run_ctxt saved;
128 unsigned long *bitmap = mds->mds_client_bitmap;
133 /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
134 if (!strcmp(med->med_mcd->mcd_uuid, obd->obd_uuid.uuid))
135 GOTO(free_and_out, 0);
137 CDEBUG(D_INFO, "freeing client at idx %u (%lld)with UUID '%s'\n",
138 med->med_idx, med->med_off, med->med_mcd->mcd_uuid);
142 /* Clear the bit _after_ zeroing out the client so we don't
143 race with mds_client_add and zero out new clients.*/
144 if (!test_bit(med->med_idx, bitmap)) {
145 CERROR("MDS client %u: bit already clear in bitmap!!\n",
151 memset(&zero_mcd, 0, sizeof zero_mcd);
152 push_ctxt(&saved, &obd->obd_ctxt, NULL);
153 rc = fsfilt_write_record(obd, mds->mds_rcvd_filp, &zero_mcd,
154 sizeof(zero_mcd), &med->med_off, 1);
155 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
157 CDEBUG(rc == 0 ? D_INFO : D_ERROR,
158 "zeroing out client %s idx %u in %s rc %d\n",
159 med->med_mcd->mcd_uuid, med->med_idx, LAST_RCVD, rc);
162 if (!test_and_clear_bit(med->med_idx, bitmap)) {
163 CERROR("MDS client %u: bit already clear in bitmap!!\n",
169 OBD_FREE(med->med_mcd, sizeof(*med->med_mcd));
174 static int mds_server_free_data(struct mds_obd *mds)
176 OBD_FREE(mds->mds_client_bitmap,
177 MDS_MAX_CLIENT_WORDS * sizeof(unsigned long));
178 OBD_FREE(mds->mds_server_data, sizeof(*mds->mds_server_data));
179 mds->mds_server_data = NULL;
184 static int mds_read_last_rcvd(struct obd_device *obd, struct file *file)
186 struct mds_obd *mds = &obd->u.mds;
187 struct mds_server_data *msd;
188 struct mds_client_data *mcd = NULL;
190 unsigned long last_rcvd_size = file->f_dentry->d_inode->i_size;
195 /* ensure padding in the struct is the correct size */
196 LASSERT (offsetof(struct mds_server_data, msd_padding) +
197 sizeof(msd->msd_padding) == MDS_LR_SERVER_SIZE);
198 LASSERT (offsetof(struct mds_client_data, mcd_padding) +
199 sizeof(mcd->mcd_padding) == MDS_LR_CLIENT_SIZE);
201 OBD_ALLOC_WAIT(msd, sizeof(*msd));
205 OBD_ALLOC_WAIT(mds->mds_client_bitmap,
206 MDS_MAX_CLIENT_WORDS * sizeof(unsigned long));
207 if (!mds->mds_client_bitmap) {
208 OBD_FREE(msd, sizeof(*msd));
212 mds->mds_server_data = msd;
214 if (last_rcvd_size == 0) {
215 CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD);
217 memcpy(msd->msd_uuid, obd->obd_uuid.uuid,sizeof(msd->msd_uuid));
218 msd->msd_last_transno = 0;
219 mount_count = msd->msd_mount_count = 0;
220 msd->msd_server_size = cpu_to_le32(MDS_LR_SERVER_SIZE);
221 msd->msd_client_start = cpu_to_le32(MDS_LR_CLIENT_START);
222 msd->msd_client_size = cpu_to_le16(MDS_LR_CLIENT_SIZE);
223 msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID);
225 rc = fsfilt_read_record(obd, file, msd, sizeof(*msd), &off);
227 CERROR("error reading MDS %s: rc = %d\n", LAST_RCVD, rc);
230 if (strcmp(msd->msd_uuid, obd->obd_uuid.uuid) != 0) {
231 CERROR("OBD UUID %s does not match last_rcvd UUID %s\n",
232 obd->obd_uuid.uuid, msd->msd_uuid);
233 GOTO(err_msd, rc = -EINVAL);
235 mount_count = le64_to_cpu(msd->msd_mount_count);
237 if (msd->msd_feature_incompat & ~cpu_to_le32(MDS_INCOMPAT_SUPP)) {
238 CERROR("unsupported incompat feature %x\n",
239 le32_to_cpu(msd->msd_feature_incompat) &
241 GOTO(err_msd, rc = -EINVAL);
243 /* XXX updating existing b_devel fs only, can be removed in future */
244 msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID);
245 if (msd->msd_feature_rocompat & ~cpu_to_le32(MDS_ROCOMPAT_SUPP)) {
246 CERROR("unsupported read-only feature %x\n",
247 le32_to_cpu(msd->msd_feature_rocompat) &
249 /* Do something like remount filesystem read-only */
250 GOTO(err_msd, rc = -EINVAL);
253 mds->mds_last_transno = le64_to_cpu(msd->msd_last_transno);
255 CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
256 obd->obd_name, mds->mds_last_transno);
257 CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
258 obd->obd_name, mount_count + 1);
259 CDEBUG(D_INODE, "%s: server data size: %u\n",
260 obd->obd_name, le32_to_cpu(msd->msd_server_size));
261 CDEBUG(D_INODE, "%s: per-client data start: %u\n",
262 obd->obd_name, le32_to_cpu(msd->msd_client_start));
263 CDEBUG(D_INODE, "%s: per-client data size: %u\n",
264 obd->obd_name, le32_to_cpu(msd->msd_client_size));
265 CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
266 obd->obd_name, last_rcvd_size);
267 CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
268 last_rcvd_size <= MDS_LR_CLIENT_START ? 0 :
269 (last_rcvd_size - MDS_LR_CLIENT_START) / MDS_LR_CLIENT_SIZE);
271 /* When we do a clean MDS shutdown, we save the last_transno into
272 * the header. If we find clients with higher last_transno values
273 * then those clients may need recovery done. */
274 for (cl_idx = 0, off = le32_to_cpu(msd->msd_client_start);
275 off < last_rcvd_size; cl_idx++) {
277 struct obd_export *exp;
278 struct mds_export_data *med;
281 OBD_ALLOC_WAIT(mcd, sizeof(*mcd));
283 GOTO(err_client, rc = -ENOMEM);
286 /* Don't assume off is incremented properly by
287 * fsfilt_read_record(), in case sizeof(*mcd)
288 * isn't the same as msd->msd_client_size. */
289 off = le32_to_cpu(msd->msd_client_start) +
290 cl_idx * le16_to_cpu(msd->msd_client_size);
291 rc = fsfilt_read_record(obd, file, mcd, sizeof(*mcd), &off);
293 CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
294 LAST_RCVD, cl_idx, off, rc);
295 break; /* read error shouldn't cause startup to fail */
298 if (mcd->mcd_uuid[0] == '\0') {
299 CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
304 last_transno = le64_to_cpu(mcd->mcd_last_transno);
306 /* These exports are cleaned up by mds_disconnect(), so they
307 * need to be set up like real exports as mds_connect() does.
309 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
310 " srv lr: "LPU64"\n", mcd->mcd_uuid, cl_idx,
311 last_transno, le64_to_cpu(msd->msd_last_transno));
313 exp = class_new_export(obd);
315 GOTO(err_client, rc = -ENOMEM);
317 memcpy(&exp->exp_client_uuid.uuid, mcd->mcd_uuid,
318 sizeof exp->exp_client_uuid.uuid);
319 med = &exp->exp_mds_data;
321 mds_client_add(obd, mds, med, cl_idx);
322 /* create helper if export init gets more complex */
323 INIT_LIST_HEAD(&med->med_open_head);
324 spin_lock_init(&med->med_open_lock);
327 obd->obd_recoverable_clients++;
328 obd->obd_max_recoverable_clients++;
329 class_export_put(exp);
331 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
332 cl_idx, last_transno);
334 if (last_transno > mds->mds_last_transno)
335 mds->mds_last_transno = last_transno;
338 obd->obd_last_committed = mds->mds_last_transno;
339 if (obd->obd_recoverable_clients) {
340 CWARN("RECOVERY: service %s, %d recoverable clients, "
341 "last_transno "LPU64"\n", obd->obd_name,
342 obd->obd_recoverable_clients, mds->mds_last_transno);
343 obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
344 obd->obd_recovering = 1;
348 OBD_FREE(mcd, sizeof(*mcd));
350 mds->mds_mount_count = mount_count + 1;
351 msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
353 /* save it, so mount count and last_transno is current */
354 rc = mds_update_server_data(obd, 1);
359 class_disconnect_exports(obd, 0);
361 mds_server_free_data(mds);
365 int mds_fs_setup(struct obd_device *obd, struct vfsmount *mnt)
367 struct mds_obd *mds = &obd->u.mds;
368 struct obd_run_ctxt saved;
369 struct dentry *dentry;
374 rc = cleanup_group_info();
378 mds->mds_vfsmnt = mnt;
379 mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
381 fsfilt_setup(obd, mds->mds_sb);
383 OBD_SET_CTXT_MAGIC(&obd->obd_ctxt);
384 obd->obd_ctxt.pwdmnt = mnt;
385 obd->obd_ctxt.pwd = mnt->mnt_root;
386 obd->obd_ctxt.fs = get_ds();
387 obd->obd_ctxt.cb_ops = mds_lvfs_ops;
389 /* setup the directory tree */
390 push_ctxt(&saved, &obd->obd_ctxt, NULL);
391 dentry = simple_mkdir(current->fs->pwd, "ROOT", 0755, 0);
392 if (IS_ERR(dentry)) {
393 rc = PTR_ERR(dentry);
394 CERROR("cannot create ROOT directory: rc = %d\n", rc);
398 mds->mds_rootfid.id = dentry->d_inode->i_ino;
399 mds->mds_rootfid.generation = dentry->d_inode->i_generation;
400 mds->mds_rootfid.f_type = S_IFDIR;
404 dentry = lookup_one_len("__iopen__", current->fs->pwd,
405 strlen("__iopen__"));
406 if (IS_ERR(dentry)) {
407 rc = PTR_ERR(dentry);
408 CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc);
411 if (!dentry->d_inode) {
413 CERROR("__iopen__ directory has no inode? rc = %d\n", rc);
416 mds->mds_fid_de = dentry;
418 dentry = simple_mkdir(current->fs->pwd, "PENDING", 0777, 1);
419 if (IS_ERR(dentry)) {
420 rc = PTR_ERR(dentry);
421 CERROR("cannot create PENDING directory: rc = %d\n", rc);
424 mds->mds_pending_dir = dentry;
426 dentry = simple_mkdir(current->fs->pwd, "LOGS", 0777, 1);
427 if (IS_ERR(dentry)) {
428 rc = PTR_ERR(dentry);
429 CERROR("cannot create LOGS directory: rc = %d\n", rc);
430 GOTO(err_pending, rc);
432 mds->mds_logs_dir = dentry;
434 dentry = simple_mkdir(current->fs->pwd, "OBJECTS", 0777, 1);
435 if (IS_ERR(dentry)) {
436 rc = PTR_ERR(dentry);
437 CERROR("cannot create OBJECTS directory: rc = %d\n", rc);
440 mds->mds_objects_dir = dentry;
442 /* open and test the last rcvd file */
443 file = filp_open(LAST_RCVD, O_RDWR | O_CREAT, 0644);
446 CERROR("cannot open/create %s file: rc = %d\n", LAST_RCVD, rc);
447 GOTO(err_objects, rc = PTR_ERR(file));
449 mds->mds_rcvd_filp = file;
450 if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
451 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
452 file->f_dentry->d_inode->i_mode);
453 GOTO(err_last_rcvd, rc = -ENOENT);
456 rc = mds_read_last_rcvd(obd, file);
458 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
459 GOTO(err_last_rcvd, rc);
462 /* open and test the lov objd file */
463 file = filp_open(LOV_OBJID, O_RDWR | O_CREAT, 0644);
466 CERROR("cannot open/create %s file: rc = %d\n", LOV_OBJID, rc);
467 GOTO(err_client, rc = PTR_ERR(file));
469 mds->mds_lov_objid_filp = file;
470 if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
471 CERROR("%s is not a regular file!: mode = %o\n", LOV_OBJID,
472 file->f_dentry->d_inode->i_mode);
473 GOTO(err_lov_objid, rc = -ENOENT);
476 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
481 if (mds->mds_lov_objid_filp && filp_close(mds->mds_lov_objid_filp, 0))
482 CERROR("can't close %s after error\n", LOV_OBJID);
484 class_disconnect_exports(obd, 0);
486 if (mds->mds_rcvd_filp && filp_close(mds->mds_rcvd_filp, 0))
487 CERROR("can't close %s after error\n", LAST_RCVD);
489 dput(mds->mds_objects_dir);
491 dput(mds->mds_logs_dir);
493 dput(mds->mds_pending_dir);
495 dput(mds->mds_fid_de);
500 int mds_fs_cleanup(struct obd_device *obd, int flags)
502 struct mds_obd *mds = &obd->u.mds;
503 struct obd_run_ctxt saved;
506 if (flags & OBD_OPT_FAILOVER)
507 CERROR("%s: shutting down for failover; client state will"
508 " be preserved.\n", obd->obd_name);
510 class_disconnect_exports(obd, flags); /* cleans up client info too */
511 mds_server_free_data(mds);
513 push_ctxt(&saved, &obd->obd_ctxt, NULL);
514 if (mds->mds_rcvd_filp) {
515 rc = filp_close(mds->mds_rcvd_filp, 0);
516 mds->mds_rcvd_filp = NULL;
518 CERROR("%s file won't close, rc=%d\n", LAST_RCVD, rc);
520 if (mds->mds_lov_objid_filp) {
521 rc = filp_close(mds->mds_lov_objid_filp, 0);
522 mds->mds_lov_objid_filp = NULL;
524 CERROR("%s file won't close, rc=%d\n", LOV_OBJID, rc);
526 if (mds->mds_objects_dir != NULL) {
527 l_dput(mds->mds_objects_dir);
528 mds->mds_objects_dir = NULL;
530 if (mds->mds_logs_dir) {
531 l_dput(mds->mds_logs_dir);
532 mds->mds_logs_dir = NULL;
534 if (mds->mds_pending_dir) {
535 l_dput(mds->mds_pending_dir);
536 mds->mds_pending_dir = NULL;
538 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
539 shrink_dcache_parent(mds->mds_fid_de);
540 dput(mds->mds_fid_de);
545 /* Creates an object with the same name as its fid. Because this is not at all
546 * performance sensitive, it is accomplished by creating a file, checking the
547 * fid, and renaming it. */
548 int mds_obd_create(struct obd_export *exp, struct obdo *oa,
549 struct lov_stripe_md **ea, struct obd_trans_info *oti)
551 struct mds_obd *mds = &exp->exp_obd->u.mds;
552 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
553 unsigned int tmpname = ll_insecure_random_int();
555 struct dentry *new_child;
556 struct obd_run_ctxt saved;
557 char fidname[LL_FID_NAMELEN];
559 int rc = 0, err, namelen;
562 push_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
564 sprintf(fidname, "OBJECTS/%u", tmpname);
565 filp = filp_open(fidname, O_CREAT | O_EXCL, 0644);
569 CERROR("impossible object name collision %u\n",
573 CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
577 LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent);
579 oa->o_id = filp->f_dentry->d_inode->i_ino;
580 oa->o_generation = filp->f_dentry->d_inode->i_generation;
581 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
583 down(&parent_inode->i_sem);
584 new_child = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
586 if (IS_ERR(new_child)) {
587 CERROR("getting neg dentry for obj rename: %d\n", rc);
588 GOTO(out_close, rc = PTR_ERR(new_child));
590 if (new_child->d_inode != NULL) {
591 CERROR("impossible non-negative obj dentry " LPU64":%u!\n",
592 oa->o_id, oa->o_generation);
596 handle = fsfilt_start(exp->exp_obd, mds->mds_objects_dir->d_inode,
597 FSFILT_OP_RENAME, NULL);
599 GOTO(out_dput, rc = PTR_ERR(handle));
602 rc = vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry,
603 mds->mds_objects_dir->d_inode, new_child);
606 CERROR("error renaming new object "LPU64":%u: rc %d\n",
607 oa->o_id, oa->o_generation, rc);
609 err = fsfilt_commit(exp->exp_obd, mds->mds_objects_dir->d_inode,
612 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER;
618 up(&parent_inode->i_sem);
619 err = filp_close(filp, 0);
621 CERROR("closing tmpfile %u: rc %d\n", tmpname, rc);
626 pop_ctxt(&saved, &exp->exp_obd->obd_ctxt, NULL);
630 int mds_obd_destroy(struct obd_export *exp, struct obdo *oa,
631 struct lov_stripe_md *ea, struct obd_trans_info *oti)
633 struct mds_obd *mds = &exp->exp_obd->u.mds;
634 struct inode *parent_inode = mds->mds_objects_dir->d_inode;
635 struct obd_device *obd = exp->exp_obd;
636 struct obd_run_ctxt saved;
637 char fidname[LL_FID_NAMELEN];
640 int err, namelen, rc = 0;
643 push_ctxt(&saved, &obd->obd_ctxt, NULL);
645 namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
647 down(&parent_inode->i_sem);
648 de = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
649 if (de == NULL || de->d_inode == NULL) {
650 CERROR("destroying non-existent object "LPU64" %s\n",
652 GOTO(out_dput, rc = IS_ERR(de) ? PTR_ERR(de) : -ENOENT);
655 /* Stripe count is 1 here since this is some MDS specific stuff
656 that is unlinked, not spanned across multiple OSTs */
657 handle = fsfilt_start_log(obd, mds->mds_objects_dir->d_inode,
658 FSFILT_OP_UNLINK, oti, 1);
659 if (IS_ERR(handle)) {
660 GOTO(out_dput, rc = PTR_ERR(handle));
663 rc = vfs_unlink(mds->mds_objects_dir->d_inode, de);
665 CERROR("error destroying object "LPU64":%u: rc %d\n",
666 oa->o_id, oa->o_generation, rc);
668 err = fsfilt_commit(obd, mds->mds_objects_dir->d_inode, handle, 0);
674 up(&parent_inode->i_sem);
675 pop_ctxt(&saved, &obd->obd_ctxt, NULL);