From: Kazuya Mio <k-mio@sx.jp.nec.com>
Date: Mon, 30 Jan 2012 08:41:25 +0000 (+0900)
Subject: ext3: Don't call dquot_free_block() if we don't update anything
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=053800a84b942511054b51299db4430b3d1b06bc;p=deliverable%2Flinux.git

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 a2038928f9a3..954a7d355f59 100644
--- 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);