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authorJan Kara <jack@suse.cz>2007-05-16 22:11:19 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-17 05:23:05 -0700
commit7925409e202a41176b729671eab6e610a54153cd (patch)
tree7b97858fa33169a1616cc6f1e05b66117e97c1b3 /fs/dquot.c
parentbb49b32fece7910fbb02a6934bca4495596f6c8c (diff)
circular locking dependency found in QUOTA OFF
i_mutex on quota files is special. Unlike i_mutexes for other inodes it is acquired under dqonoff_mutex. Tell lockdep about this lock ranking. Also comment and code in quota_sync_sb() seem to be bogus (as i_mutex for quota file can be acquired under dqonoff_mutex). Move truncate_inode_pages() call under dqonoff_mutex and save some problems with races... Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dquot.c')
-rw-r--r--fs/dquot.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
index 3a995841de9..8819d281500 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -1421,7 +1421,7 @@ int vfs_quota_off(struct super_block *sb, int type)
/* If quota was reenabled in the meantime, we have
* nothing to do */
if (!sb_has_quota_enabled(sb, cnt)) {
- mutex_lock(&toputinode[cnt]->i_mutex);
+ mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
S_NOATIME | S_NOQUOTA);
truncate_inode_pages(&toputinode[cnt]->i_data, 0);