From 00db646d3fb3f5f62c2327abcf3630f4cc1075ba Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 1 Apr 2015 14:39:06 +0800 Subject: [PATCH] btrfs: backref: Don't merge refs which are not for same block. Old __merge_refs() in backref.c will even merge refs whose root_id are different, which makes qgroup gives wrong result. Fix it by checking ref_for_same_block() before any mode specific works. Signed-off-by: Qu Wenruo Signed-off-by: Chris Mason --- fs/btrfs/backref.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 679dc97..a3316f1 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -509,7 +509,7 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info, } /* - * merge two lists of backrefs and adjust counts accordingly + * merge backrefs and adjust counts accordingly * * mode = 1: merge identical keys, if key is set * FIXME: if we add more keys in __add_prelim_ref, we can merge more here. @@ -537,9 +537,9 @@ static void __merge_refs(struct list_head *head, int mode) ref2 = list_entry(pos2, struct __prelim_ref, list); + if (!ref_for_same_block(ref1, ref2)) + continue; if (mode == 1) { - if (!ref_for_same_block(ref1, ref2)) - continue; if (!ref1->parent && ref2->parent) { xchg = ref1; ref1 = ref2; -- 2.7.4