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| author | Jan Kara <jack@suse.cz> | 2008-04-15 14:34:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-15 19:35:41 -0700 |
| commit | 335e92e8a515420bd47a6b0f01cb9a206c0ed6e4 (patch) | |
| tree | 1518f9afa7ac7047be2c86481b3dbc12f8cc9282 /fs/ext3 | |
| parent | 423bec43079a2942a3004034df7aad76469758d8 (diff) | |
| download | lwn-335e92e8a515420bd47a6b0f01cb9a206c0ed6e4.tar.gz lwn-335e92e8a515420bd47a6b0f01cb9a206c0ed6e4.zip | |
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
mb_cache_entry_alloc() was allocating cache entries with GFP_KERNEL. But
filesystems are calling this function while holding xattr_sem so possible
recursion into the fs violates locking ordering of xattr_sem and transaction
start / i_mutex for ext2-4. Change mb_cache_entry_alloc() so that filesystems
can specify desired gfp mask and use GFP_NOFS from all of them.
Signed-off-by: Jan Kara <jack@suse.cz>
Reported-by: Dave Jones <davej@redhat.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext3')
| -rw-r--r-- | fs/ext3/xattr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext3/xattr.c b/fs/ext3/xattr.c index a6ea4d6a8bb2..42856541e9a5 100644 --- a/fs/ext3/xattr.c +++ b/fs/ext3/xattr.c @@ -1126,7 +1126,7 @@ ext3_xattr_cache_insert(struct buffer_head *bh) struct mb_cache_entry *ce; int error; - ce = mb_cache_entry_alloc(ext3_xattr_cache); + ce = mb_cache_entry_alloc(ext3_xattr_cache, GFP_NOFS); if (!ce) { ea_bdebug(bh, "out of memory"); return; |