From: Yongqiang Yang <xiaoqiangnk@gmail.com>
Date: Mon, 24 Sep 2012 03:10:51 +0000 (-0400)
Subject: ext4: check free block counters in ext4_mb_find_by_goal
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=838cd0cf9af52e034ee81513642083bbe8e4ddb1;p=openwrt%2Fstaging%2Fblogic.git

ext4: check free block counters in ext4_mb_find_by_goal

Free block counters should be checked before doing allocation.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 2c7c082b8169..bb821a924049 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1660,10 +1660,13 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
 	int max;
 	int err;
 	struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+	struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group);
 	struct ext4_free_extent ex;
 
 	if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL))
 		return 0;
+	if (grp->bb_free == 0)
+		return 0;
 
 	err = ext4_mb_load_buddy(ac->ac_sb, group, e4b);
 	if (err)