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btrfs: backref: Don't merge refs which are not for same block.

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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 <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-04-01 14:39:06 +08:00 committed by Chris Mason
parent 20b2e3029e
commit 00db646d3f
1 changed files with 3 additions and 3 deletions
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6
fs/btrfs/backref.c
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@ -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;