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 2c7c082..bb821a9 100644 (file)
--- 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)