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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 /include/linux/mbcache.h | |
| parent | Documentation: correct overcommit caveat in hugetlbpage.txt (diff) | |
| download | linux-dev-335e92e8a515420bd47a6b0f01cb9a206c0ed6e4.tar.xz linux-dev-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 'include/linux/mbcache.h')
| -rw-r--r-- | include/linux/mbcache.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h index 99e044b4efc6..a09b84e4fdb4 100644 --- a/include/linux/mbcache.h +++ b/include/linux/mbcache.h @@ -34,7 +34,7 @@ void mb_cache_destroy(struct mb_cache *); /* Functions on cache entries */ -struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *); +struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t); int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *, sector_t, unsigned int[]); void mb_cache_entry_release(struct mb_cache_entry *); |