ext3: Don't call dquot_free_block() if we don't update anything

dquot_free_block() is called in the end of ext3_new_blocks() and updates
information of the inode structure. However, this update is not necessary
if the number of blocks we requested is equal to the number of
allocated blocks.

Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index a2038928f9a34b060abe6534958a830f85bd372f..954a7d355f59305f034c0787bae014ca6c8580aa 100644 (file)
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -1743,8 +1743,11 @@ allocated:
 
        *errp = 0;
        brelse(bitmap_bh);
-       dquot_free_block(inode, *count-num);
-       *count = num;
+
+       if (num < *count) {
+               dquot_free_block(inode, *count-num);
+               *count = num;
+       }
 
        trace_ext3_allocate_blocks(inode, goal, num,
                                   (unsigned long long)ret_block);