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authorJan Kara <jack@suse.cz>2008-04-16 01:34:43 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-16 06:35:41 +0400
commit335e92e8a515420bd47a6b0f01cb9a206c0ed6e4 (patch)
tree1518f9afa7ac7047be2c86481b3dbc12f8cc9282 /fs/ext2/xattr.c
parent423bec43079a2942a3004034df7aad76469758d8 (diff)
downloadlinux-335e92e8a515420bd47a6b0f01cb9a206c0ed6e4.tar.xz
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/ext2/xattr.c')
-rw-r--r--fs/ext2/xattr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 3e8683dbb13f..a99d46f3b26e 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -835,7 +835,7 @@ ext2_xattr_cache_insert(struct buffer_head *bh)
struct mb_cache_entry *ce;
int error;
- ce = mb_cache_entry_alloc(ext2_xattr_cache);
+ ce = mb_cache_entry_alloc(ext2_xattr_cache, GFP_NOFS);
if (!ce)
return -ENOMEM;
error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, &hash);