blob: 8db4b58b2e4b2e92a5e6fe42c7c71c657866c125 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dcache.c
5 *
6 * dentry cache handling code
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/namei.h>
30
Mark Fashehccd979b2005-12-15 14:31:24 -080031#include <cluster/masklog.h>
32
33#include "ocfs2.h"
34
35#include "alloc.h"
36#include "dcache.h"
Mark Fasheh80c05842006-09-08 14:43:18 -070037#include "dlmglue.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080038#include "file.h"
39#include "inode.h"
Jan Karaea455f82009-01-12 23:20:31 +010040#include "super.h"
Tao Maa5b84432011-02-23 22:51:49 +080041#include "ocfs2_trace.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080042
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -050043void ocfs2_dentry_attach_gen(struct dentry *dentry)
44{
45 unsigned long gen =
46 OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
47 BUG_ON(dentry->d_inode);
48 dentry->d_fsdata = (void *)gen;
49}
50
Mark Fasheh80c05842006-09-08 14:43:18 -070051
Al Viro0b728e12012-06-10 16:03:43 -040052static int ocfs2_dentry_revalidate(struct dentry *dentry, unsigned int flags)
Mark Fashehccd979b2005-12-15 14:31:24 -080053{
Nick Piggin34286d62011-01-07 17:49:57 +110054 struct inode *inode;
Mark Fashehccd979b2005-12-15 14:31:24 -080055 int ret = 0; /* if all else fails, just return false */
Nick Piggin34286d62011-01-07 17:49:57 +110056 struct ocfs2_super *osb;
57
Al Viro0b728e12012-06-10 16:03:43 -040058 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +110059 return -ECHILD;
60
61 inode = dentry->d_inode;
62 osb = OCFS2_SB(dentry->d_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -080063
Tao Maa5b84432011-02-23 22:51:49 +080064 trace_ocfs2_dentry_revalidate(dentry, dentry->d_name.len,
65 dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -080066
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -050067 /* For a negative dentry -
68 * check the generation number of the parent and compare with the
69 * one stored in the inode.
70 */
Mark Fashehccd979b2005-12-15 14:31:24 -080071 if (inode == NULL) {
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -050072 unsigned long gen = (unsigned long) dentry->d_fsdata;
73 unsigned long pgen =
74 OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
Tao Maa5b84432011-02-23 22:51:49 +080075
76 trace_ocfs2_dentry_revalidate_negative(dentry->d_name.len,
77 dentry->d_name.name,
78 pgen, gen);
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -050079 if (gen != pgen)
80 goto bail;
81 goto valid;
Mark Fashehccd979b2005-12-15 14:31:24 -080082 }
83
Mark Fashehccd979b2005-12-15 14:31:24 -080084 BUG_ON(!osb);
85
Mark Fasheh80c05842006-09-08 14:43:18 -070086 if (inode == osb->root_inode || is_bad_inode(inode))
87 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -080088
Mark Fasheh80c05842006-09-08 14:43:18 -070089 spin_lock(&OCFS2_I(inode)->ip_lock);
90 /* did we or someone else delete this inode? */
91 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
92 spin_unlock(&OCFS2_I(inode)->ip_lock);
Tao Maa5b84432011-02-23 22:51:49 +080093 trace_ocfs2_dentry_revalidate_delete(
94 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fasheh80c05842006-09-08 14:43:18 -070095 goto bail;
96 }
97 spin_unlock(&OCFS2_I(inode)->ip_lock);
98
99 /*
100 * We don't need a cluster lock to test this because once an
101 * inode nlink hits zero, it never goes back.
102 */
103 if (inode->i_nlink == 0) {
Tao Maa5b84432011-02-23 22:51:49 +0800104 trace_ocfs2_dentry_revalidate_orphaned(
105 (unsigned long long)OCFS2_I(inode)->ip_blkno,
106 S_ISDIR(inode->i_mode));
Mark Fasheh80c05842006-09-08 14:43:18 -0700107 goto bail;
Mark Fashehccd979b2005-12-15 14:31:24 -0800108 }
109
Tao Maa1b08e72009-08-27 14:46:56 +0800110 /*
111 * If the last lookup failed to create dentry lock, let us
112 * redo it.
113 */
114 if (!dentry->d_fsdata) {
Tao Maa5b84432011-02-23 22:51:49 +0800115 trace_ocfs2_dentry_revalidate_nofsdata(
116 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Tao Maa1b08e72009-08-27 14:46:56 +0800117 goto bail;
118 }
119
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -0500120valid:
Mark Fashehccd979b2005-12-15 14:31:24 -0800121 ret = 1;
122
123bail:
Tao Maa5b84432011-02-23 22:51:49 +0800124 trace_ocfs2_dentry_revalidate_ret(ret);
Mark Fashehccd979b2005-12-15 14:31:24 -0800125 return ret;
126}
127
Mark Fasheh80c05842006-09-08 14:43:18 -0700128static int ocfs2_match_dentry(struct dentry *dentry,
129 u64 parent_blkno,
130 int skip_unhashed)
131{
132 struct inode *parent;
133
134 /*
135 * ocfs2_lookup() does a d_splice_alias() _before_ attaching
136 * to the lock data, so we skip those here, otherwise
137 * ocfs2_dentry_attach_lock() will get its original dentry
138 * back.
139 */
140 if (!dentry->d_fsdata)
141 return 0;
142
143 if (!dentry->d_parent)
144 return 0;
145
146 if (skip_unhashed && d_unhashed(dentry))
147 return 0;
148
149 parent = dentry->d_parent->d_inode;
150 /* Negative parent dentry? */
151 if (!parent)
152 return 0;
153
154 /* Name is in a different directory. */
155 if (OCFS2_I(parent)->ip_blkno != parent_blkno)
156 return 0;
157
158 return 1;
159}
160
161/*
162 * Walk the inode alias list, and find a dentry which has a given
163 * parent. ocfs2_dentry_attach_lock() wants to find _any_ alias as it
Mark Fasheh34d024f2007-09-24 15:56:19 -0700164 * is looking for a dentry_lock reference. The downconvert thread is
165 * looking to unhash aliases, so we allow it to skip any that already
166 * have that property.
Mark Fasheh80c05842006-09-08 14:43:18 -0700167 */
168struct dentry *ocfs2_find_local_alias(struct inode *inode,
169 u64 parent_blkno,
170 int skip_unhashed)
171{
Al Virob3d9b7a2012-06-09 13:51:19 -0400172 struct hlist_node *p;
Al Viroa614a092012-06-09 13:09:15 -0400173 struct dentry *dentry;
Mark Fasheh80c05842006-09-08 14:43:18 -0700174
Nick Piggin873feea2011-01-07 17:50:06 +1100175 spin_lock(&inode->i_lock);
Al Virob3d9b7a2012-06-09 13:51:19 -0400176 hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
Nick Pigginda502952011-01-07 17:49:33 +1100177 spin_lock(&dentry->d_lock);
Mark Fasheh80c05842006-09-08 14:43:18 -0700178 if (ocfs2_match_dentry(dentry, parent_blkno, skip_unhashed)) {
Tao Maa5b84432011-02-23 22:51:49 +0800179 trace_ocfs2_find_local_alias(dentry->d_name.len,
180 dentry->d_name.name);
Mark Fasheh80c05842006-09-08 14:43:18 -0700181
Nick Piggindc0474b2011-01-07 17:49:43 +1100182 dget_dlock(dentry);
Nick Pigginda502952011-01-07 17:49:33 +1100183 spin_unlock(&dentry->d_lock);
Al Viroa614a092012-06-09 13:09:15 -0400184 spin_unlock(&inode->i_lock);
185 return dentry;
Mark Fasheh80c05842006-09-08 14:43:18 -0700186 }
Nick Pigginda502952011-01-07 17:49:33 +1100187 spin_unlock(&dentry->d_lock);
Mark Fasheh80c05842006-09-08 14:43:18 -0700188 }
Nick Piggin873feea2011-01-07 17:50:06 +1100189 spin_unlock(&inode->i_lock);
Al Viroa614a092012-06-09 13:09:15 -0400190 return NULL;
Mark Fasheh80c05842006-09-08 14:43:18 -0700191}
192
Mark Fashehd680efe2006-09-08 14:14:34 -0700193DEFINE_SPINLOCK(dentry_attach_lock);
194
Mark Fasheh80c05842006-09-08 14:43:18 -0700195/*
196 * Attach this dentry to a cluster lock.
197 *
198 * Dentry locks cover all links in a given directory to a particular
199 * inode. We do this so that ocfs2 can build a lock name which all
200 * nodes in the cluster can agree on at all times. Shoving full names
201 * in the cluster lock won't work due to size restrictions. Covering
202 * links inside of a directory is a good compromise because it still
203 * allows us to use the parent directory lock to synchronize
204 * operations.
205 *
206 * Call this function with the parent dir semaphore and the parent dir
207 * cluster lock held.
208 *
209 * The dir semaphore will protect us from having to worry about
210 * concurrent processes on our node trying to attach a lock at the
211 * same time.
212 *
213 * The dir cluster lock (held at either PR or EX mode) protects us
214 * from unlink and rename on other nodes.
215 *
Mark Fasheh80c05842006-09-08 14:43:18 -0700216 * A dput() can happen asynchronously due to pruning, so we cover
217 * attaching and detaching the dentry lock with a
218 * dentry_attach_lock.
219 *
220 * A node which has done lookup on a name retains a protected read
221 * lock until final dput. If the user requests and unlink or rename,
222 * the protected read is upgraded to an exclusive lock. Other nodes
223 * who have seen the dentry will then be informed that they need to
224 * downgrade their lock, which will involve d_delete on the
225 * dentry. This happens in ocfs2_dentry_convert_worker().
226 */
227int ocfs2_dentry_attach_lock(struct dentry *dentry,
228 struct inode *inode,
Mark Fasheh0027dd52006-09-21 16:51:28 -0700229 u64 parent_blkno)
Mark Fasheh80c05842006-09-08 14:43:18 -0700230{
231 int ret;
232 struct dentry *alias;
233 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
234
Tao Maa5b84432011-02-23 22:51:49 +0800235 trace_ocfs2_dentry_attach_lock(dentry->d_name.len, dentry->d_name.name,
236 (unsigned long long)parent_blkno, dl);
Mark Fasheh80c05842006-09-08 14:43:18 -0700237
238 /*
239 * Negative dentry. We ignore these for now.
240 *
241 * XXX: Could we can improve ocfs2_dentry_revalidate() by
242 * tracking these?
243 */
244 if (!inode)
245 return 0;
246
Goldwyn Rodrigues5e98d492010-06-28 10:04:32 -0500247 if (!dentry->d_inode && dentry->d_fsdata) {
248 /* Converting a negative dentry to positive
249 Clear dentry->d_fsdata */
250 dentry->d_fsdata = dl = NULL;
251 }
252
Mark Fasheh80c05842006-09-08 14:43:18 -0700253 if (dl) {
254 mlog_bug_on_msg(dl->dl_parent_blkno != parent_blkno,
255 " \"%.*s\": old parent: %llu, new: %llu\n",
256 dentry->d_name.len, dentry->d_name.name,
257 (unsigned long long)parent_blkno,
258 (unsigned long long)dl->dl_parent_blkno);
259 return 0;
260 }
261
262 alias = ocfs2_find_local_alias(inode, parent_blkno, 0);
263 if (alias) {
264 /*
265 * Great, an alias exists, which means we must have a
266 * dentry lock already. We can just grab the lock off
267 * the alias and add it to the list.
268 *
269 * We're depending here on the fact that this dentry
270 * was found and exists in the dcache and so must have
271 * a reference to the dentry_lock because we can't
272 * race creates. Final dput() cannot happen on it
273 * since we have it pinned, so our reference is safe.
274 */
275 dl = alias->d_fsdata;
Mark Fasheh0027dd52006-09-21 16:51:28 -0700276 mlog_bug_on_msg(!dl, "parent %llu, ino %llu\n",
Mark Fasheh80c05842006-09-08 14:43:18 -0700277 (unsigned long long)parent_blkno,
Mark Fasheh0027dd52006-09-21 16:51:28 -0700278 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fasheh80c05842006-09-08 14:43:18 -0700279
280 mlog_bug_on_msg(dl->dl_parent_blkno != parent_blkno,
281 " \"%.*s\": old parent: %llu, new: %llu\n",
282 dentry->d_name.len, dentry->d_name.name,
283 (unsigned long long)parent_blkno,
284 (unsigned long long)dl->dl_parent_blkno);
285
Tao Maa5b84432011-02-23 22:51:49 +0800286 trace_ocfs2_dentry_attach_lock_found(dl->dl_lockres.l_name,
287 (unsigned long long)parent_blkno,
288 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fasheh80c05842006-09-08 14:43:18 -0700289
290 goto out_attach;
291 }
292
293 /*
294 * There are no other aliases
295 */
296 dl = kmalloc(sizeof(*dl), GFP_NOFS);
297 if (!dl) {
298 ret = -ENOMEM;
299 mlog_errno(ret);
300 return ret;
301 }
302
303 dl->dl_count = 0;
304 /*
305 * Does this have to happen below, for all attaches, in case
Mark Fasheh34d024f2007-09-24 15:56:19 -0700306 * the struct inode gets blown away by the downconvert thread?
Mark Fasheh80c05842006-09-08 14:43:18 -0700307 */
308 dl->dl_inode = igrab(inode);
309 dl->dl_parent_blkno = parent_blkno;
310 ocfs2_dentry_lock_res_init(dl, parent_blkno, inode);
311
312out_attach:
313 spin_lock(&dentry_attach_lock);
314 dentry->d_fsdata = dl;
315 dl->dl_count++;
316 spin_unlock(&dentry_attach_lock);
317
318 /*
Mark Fasheh80c05842006-09-08 14:43:18 -0700319 * This actually gets us our PRMODE level lock. From now on,
320 * we'll have a notification if one of these names is
321 * destroyed on another node.
322 */
323 ret = ocfs2_dentry_lock(dentry, 0);
Mark Fasheh0027dd52006-09-21 16:51:28 -0700324 if (!ret)
325 ocfs2_dentry_unlock(dentry, 0);
326 else
Mark Fasheh80c05842006-09-08 14:43:18 -0700327 mlog_errno(ret);
Mark Fasheh80c05842006-09-08 14:43:18 -0700328
Sunil Mushrana5a0a632009-04-20 21:34:18 -0700329 /*
330 * In case of error, manually free the allocation and do the iput().
331 * We need to do this because error here means no d_instantiate(),
332 * which means iput() will not be called during dput(dentry).
333 */
334 if (ret < 0 && !alias) {
335 ocfs2_lock_res_free(&dl->dl_lockres);
336 BUG_ON(dl->dl_count != 1);
337 spin_lock(&dentry_attach_lock);
338 dentry->d_fsdata = NULL;
339 spin_unlock(&dentry_attach_lock);
340 kfree(dl);
341 iput(inode);
342 }
343
Mark Fasheh80c05842006-09-08 14:43:18 -0700344 dput(alias);
345
346 return ret;
347}
348
Jan Karaf7b1aa62009-07-20 12:12:36 +0200349DEFINE_SPINLOCK(dentry_list_lock);
Jan Karaea455f82009-01-12 23:20:31 +0100350
351/* We limit the number of dentry locks to drop in one go. We have
352 * this limit so that we don't starve other users of ocfs2_wq. */
353#define DL_INODE_DROP_COUNT 64
354
355/* Drop inode references from dentry locks */
Jan Karaf7b1aa62009-07-20 12:12:36 +0200356static void __ocfs2_drop_dl_inodes(struct ocfs2_super *osb, int drop_count)
Jan Karaea455f82009-01-12 23:20:31 +0100357{
Jan Karaea455f82009-01-12 23:20:31 +0100358 struct ocfs2_dentry_lock *dl;
Jan Karaea455f82009-01-12 23:20:31 +0100359
360 spin_lock(&dentry_list_lock);
Jan Karaf7b1aa62009-07-20 12:12:36 +0200361 while (osb->dentry_lock_list && (drop_count < 0 || drop_count--)) {
Jan Karaea455f82009-01-12 23:20:31 +0100362 dl = osb->dentry_lock_list;
363 osb->dentry_lock_list = dl->dl_next;
364 spin_unlock(&dentry_list_lock);
365 iput(dl->dl_inode);
366 kfree(dl);
367 spin_lock(&dentry_list_lock);
368 }
Jan Karaf7b1aa62009-07-20 12:12:36 +0200369 spin_unlock(&dentry_list_lock);
370}
371
372void ocfs2_drop_dl_inodes(struct work_struct *work)
373{
374 struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
375 dentry_lock_work);
376
377 __ocfs2_drop_dl_inodes(osb, DL_INODE_DROP_COUNT);
378 /*
379 * Don't queue dropping if umount is in progress. We flush the
380 * list in ocfs2_dismount_volume
381 */
382 spin_lock(&dentry_list_lock);
383 if (osb->dentry_lock_list &&
384 !ocfs2_test_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED))
Jan Karaea455f82009-01-12 23:20:31 +0100385 queue_work(ocfs2_wq, &osb->dentry_lock_work);
386 spin_unlock(&dentry_list_lock);
387}
388
Jan Karaf7b1aa62009-07-20 12:12:36 +0200389/* Flush the whole work queue */
390void ocfs2_drop_all_dl_inodes(struct ocfs2_super *osb)
391{
392 __ocfs2_drop_dl_inodes(osb, -1);
393}
394
Mark Fasheh80c05842006-09-08 14:43:18 -0700395/*
396 * ocfs2_dentry_iput() and friends.
397 *
398 * At this point, our particular dentry is detached from the inodes
399 * alias list, so there's no way that the locking code can find it.
400 *
401 * The interesting stuff happens when we determine that our lock needs
402 * to go away because this is the last subdir alias in the
403 * system. This function needs to handle a couple things:
404 *
405 * 1) Synchronizing lock shutdown with the downconvert threads. This
406 * is already handled for us via the lockres release drop function
407 * called in ocfs2_release_dentry_lock()
408 *
409 * 2) A race may occur when we're doing our lock shutdown and
410 * another process wants to create a new dentry lock. Right now we
411 * let them race, which means that for a very short while, this
412 * node might have two locks on a lock resource. This should be a
413 * problem though because one of them is in the process of being
414 * thrown out.
415 */
416static void ocfs2_drop_dentry_lock(struct ocfs2_super *osb,
417 struct ocfs2_dentry_lock *dl)
418{
419 ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
420 ocfs2_lock_res_free(&dl->dl_lockres);
Jan Karaea455f82009-01-12 23:20:31 +0100421
422 /* We leave dropping of inode reference to ocfs2_wq as that can
423 * possibly lead to inode deletion which gets tricky */
424 spin_lock(&dentry_list_lock);
Jan Karaf7b1aa62009-07-20 12:12:36 +0200425 if (!osb->dentry_lock_list &&
426 !ocfs2_test_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED))
Jan Karaea455f82009-01-12 23:20:31 +0100427 queue_work(ocfs2_wq, &osb->dentry_lock_work);
428 dl->dl_next = osb->dentry_lock_list;
429 osb->dentry_lock_list = dl;
430 spin_unlock(&dentry_list_lock);
Mark Fasheh80c05842006-09-08 14:43:18 -0700431}
432
433void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
434 struct ocfs2_dentry_lock *dl)
435{
Jan Karaea455f82009-01-12 23:20:31 +0100436 int unlock;
Mark Fasheh80c05842006-09-08 14:43:18 -0700437
438 BUG_ON(dl->dl_count == 0);
439
440 spin_lock(&dentry_attach_lock);
441 dl->dl_count--;
442 unlock = !dl->dl_count;
443 spin_unlock(&dentry_attach_lock);
444
445 if (unlock)
446 ocfs2_drop_dentry_lock(osb, dl);
447}
448
449static void ocfs2_dentry_iput(struct dentry *dentry, struct inode *inode)
450{
451 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
452
Mark Fashehbccb9da2007-11-07 16:35:14 -0800453 if (!dl) {
454 /*
455 * No dentry lock is ok if we're disconnected or
456 * unhashed.
457 */
458 if (!(dentry->d_flags & DCACHE_DISCONNECTED) &&
459 !d_unhashed(dentry)) {
460 unsigned long long ino = 0ULL;
461 if (inode)
462 ino = (unsigned long long)OCFS2_I(inode)->ip_blkno;
463 mlog(ML_ERROR, "Dentry is missing cluster lock. "
464 "inode: %llu, d_flags: 0x%x, d_name: %.*s\n",
465 ino, dentry->d_flags, dentry->d_name.len,
466 dentry->d_name.name);
467 }
Mark Fasheh80c05842006-09-08 14:43:18 -0700468
Mark Fasheh80c05842006-09-08 14:43:18 -0700469 goto out;
Mark Fashehbccb9da2007-11-07 16:35:14 -0800470 }
Mark Fasheh80c05842006-09-08 14:43:18 -0700471
472 mlog_bug_on_msg(dl->dl_count == 0, "dentry: %.*s, count: %u\n",
473 dentry->d_name.len, dentry->d_name.name,
474 dl->dl_count);
475
476 ocfs2_dentry_lock_put(OCFS2_SB(dentry->d_sb), dl);
477
478out:
479 iput(inode);
480}
481
482/*
483 * d_move(), but keep the locks in sync.
484 *
485 * When we are done, "dentry" will have the parent dir and name of
486 * "target", which will be thrown away.
487 *
488 * We manually update the lock of "dentry" if need be.
489 *
490 * "target" doesn't have it's dentry lock touched - we allow the later
491 * dput() to handle this for us.
492 *
493 * This is called during ocfs2_rename(), while holding parent
494 * directory locks. The dentries have already been deleted on other
495 * nodes via ocfs2_remote_dentry_delete().
496 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200497 * Normally, the VFS handles the d_move() for the file system, after
Mark Fasheh80c05842006-09-08 14:43:18 -0700498 * the ->rename() callback. OCFS2 wants to handle this internally, so
499 * the new lock can be created atomically with respect to the cluster.
500 */
501void ocfs2_dentry_move(struct dentry *dentry, struct dentry *target,
502 struct inode *old_dir, struct inode *new_dir)
503{
504 int ret;
505 struct ocfs2_super *osb = OCFS2_SB(old_dir->i_sb);
506 struct inode *inode = dentry->d_inode;
507
508 /*
509 * Move within the same directory, so the actual lock info won't
510 * change.
511 *
512 * XXX: Is there any advantage to dropping the lock here?
513 */
514 if (old_dir == new_dir)
Mark Fasheh1ba9da22006-09-08 14:22:54 -0700515 goto out_move;
Mark Fasheh80c05842006-09-08 14:43:18 -0700516
517 ocfs2_dentry_lock_put(osb, dentry->d_fsdata);
518
519 dentry->d_fsdata = NULL;
Mark Fasheh0027dd52006-09-21 16:51:28 -0700520 ret = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(new_dir)->ip_blkno);
Mark Fasheh80c05842006-09-08 14:43:18 -0700521 if (ret)
522 mlog_errno(ret);
Mark Fasheh1ba9da22006-09-08 14:22:54 -0700523
524out_move:
525 d_move(dentry, target);
Mark Fasheh80c05842006-09-08 14:43:18 -0700526}
527
Al Virod8fba0f2009-02-20 06:00:26 +0000528const struct dentry_operations ocfs2_dentry_ops = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800529 .d_revalidate = ocfs2_dentry_revalidate,
Mark Fasheh80c05842006-09-08 14:43:18 -0700530 .d_iput = ocfs2_dentry_iput,
Mark Fashehccd979b2005-12-15 14:31:24 -0800531};