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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/mbcache.c | |
| 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/mbcache.c')
| -rw-r--r-- | fs/mbcache.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/mbcache.c b/fs/mbcache.c index eb31b73e7d69..ec88ff3d04a9 100644 --- a/fs/mbcache.c +++ b/fs/mbcache.c @@ -399,11 +399,11 @@ mb_cache_destroy(struct mb_cache *cache) * if no more memory was available. */ struct mb_cache_entry * -mb_cache_entry_alloc(struct mb_cache *cache) +mb_cache_entry_alloc(struct mb_cache *cache, gfp_t gfp_flags) { struct mb_cache_entry *ce; - ce = kmem_cache_alloc(cache->c_entry_cache, GFP_KERNEL); + ce = kmem_cache_alloc(cache->c_entry_cache, gfp_flags); if (ce) { atomic_inc(&cache->c_entry_count); INIT_LIST_HEAD(&ce->e_lru_list); |