Patchwork [1/2] ext4: check free block counters in ext4_mb_find_by_goal

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Submitter Yongqiang Yang
Date Sept. 2, 2012, 9:45 a.m.
Message ID <1346579109-25016-1-git-send-email-xiaoqiangnk@gmail.com>
Download mbox | patch
Permalink /patch/181173/
State Superseded
Headers show

Comments

Yongqiang Yang - Sept. 2, 2012, 9:45 a.m.
Free block counters should be checked before doing allocation.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/mballoc.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6873571..5d4c21a 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1659,10 +1659,13 @@  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)