ext4: remove quota allocation when ext4_mb_new_blocks fails

Quota allocation is not removed when ext4_mb_new_blocks calls
kmem_cache_alloc failed.  Also make sure the allocation context is freed
on the error path.

Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 5dcb826..cde232b 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4058,8 +4058,9 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 
        ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
        if (!ac) {
+               ar->len = 0;
                *errp = -ENOMEM;
-               return 0;
+               goto out1;
        }
 
        ext4_mb_poll_new_transaction(sb, handle);
@@ -4067,7 +4068,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
        *errp = ext4_mb_initialize_context(ac, ar);
        if (*errp) {
                ar->len = 0;
-               goto out;
+               goto out2;
        }
 
        ac->ac_op = EXT4_MB_HISTORY_PREALLOC;
@@ -4115,11 +4116,12 @@ repeat:
 
        ext4_mb_release_context(ac);
 
-out:
+out2:
+       kmem_cache_free(ext4_ac_cachep, ac);
+out1:
        if (ar->len < inquota)
                DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
 
-       kmem_cache_free(ext4_ac_cachep, ac);
        return block;
 }
 static void ext4_mb_poll_new_transaction(struct super_block *sb,