[PATCH] ext4: fix unhandled ext4_free_data allocation failure

[Akinobu Mita <akinobu.mita@gmail.com>]

In ext4_mb_free_blocks() ext4_free_data allocation failure
is not handled. This error handling cannot be simple error return because
ext4_mb_free_blocks() cannot fail.

This patch add __GFP_NOFAIL to gfp mask for the allocation.

Cc: Theodore Tso <tytso@mit.edu>
Cc: adilger@sun.com
Cc: linux-ext4@vger.kernel.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 fs/ext4/mballoc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: 2.6-git/fs/ext4/mballoc.c
===================================================================
--- 2.6-git.orig/fs/ext4/mballoc.c
+++ 2.6-git/fs/ext4/mballoc.c
@@ -4885,7 +4885,8 @@ do_more:
 		 * blocks being freed are metadata. these blocks shouldn't
 		 * be used until this transaction is committed
 		 */
-		new_entry  = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS);
+		new_entry  = kmem_cache_alloc(ext4_free_ext_cachep,
+						GFP_NOFS | __GFP_NOFAIL);
 		new_entry->start_blk = bit;
 		new_entry->group  = block_group;
 		new_entry->count = count;