ext3: Fix oops in ext3_try_to_allocate_with_rsv()

commit ad95c5e9bc8b5885f94dce720137cac8fa8da4c9 upstream.

Block allocation is called from two places: ext3_get_blocks_handle() and
ext3_xattr_block_set(). These two callers are not necessarily synchronized
because xattr code holds only xattr_sem and i_mutex, and
ext3_get_blocks_handle() may hold only truncate_mutex when called from
writepage() path. Block reservation code does not expect two concurrent
allocations to happen to the same inode and thus assertions can be triggered
or reservation structure corruption can occur.

Fix the problem by taking truncate_mutex in xattr code to serialize
allocations.

CC: Sage Weil <sage@newdream.net>
Reported-by: Fyodor Ustinov <ufm@ufm.su>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/fs/ext3/xattr.c b/fs/ext3/xattr.c
index 534a94c3a93338a843cd050ef99ee03f9304d4a2..3a6356d4db30929b7560f9e79a39fc447b74580a 100644 (file)
--- a/fs/ext3/xattr.c
+++ b/fs/ext3/xattr.c
@@ -803,8 +803,16 @@ inserted:
                        /* We need to allocate a new block */
                        ext3_fsblk_t goal = ext3_group_first_block_no(sb,
                                                EXT3_I(inode)->i_block_group);
-                       ext3_fsblk_t block = ext3_new_block(handle, inode,
-                                                       goal, &error);
+                       ext3_fsblk_t block;
+
+                       /*
+                        * Protect us agaist concurrent allocations to the
+                        * same inode from ext3_..._writepage(). Reservation
+                        * code does not expect racing allocations.
+                        */
+                       mutex_lock(&EXT3_I(inode)->truncate_mutex);
+                       block = ext3_new_block(handle, inode, goal, &error);
+                       mutex_unlock(&EXT3_I(inode)->truncate_mutex);
                        if (error)
                                goto cleanup;
                        ea_idebug(inode, "creating block %d", block);