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btrfs: backref, only search backref entries from leaves of the same root

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We could have some nodes/leaves in subvolume whose owner are not the
that subvolume. In this way, when we resolve normal backrefs of that
subvolume, we should avoid collecting those references from these blocks.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: ethanwu <ethanwu@synology.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
ethanwu 2020-02-07 17:38:17 +08:00 committed by David Sterba
parent ed58f2e66e
commit cfc0eed0ec
1 changed files with 9 additions and 3 deletions
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12
fs/btrfs/backref.c
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@ -443,11 +443,14 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
* slot == nritems.
* 2. We are searching for normal backref but bytenr of this leaf
* matches shared data backref
* 3. The leaf owner is not equal to the root we are searching
*
* For these cases, go to the next leaf before we continue.
*/
eb = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(eb) ||
is_shared_data_backref(preftrees, eb->start)) {
is_shared_data_backref(preftrees, eb->start) ||
ref->root_id != btrfs_header_owner(eb)) {
if (time_seq == SEQ_LAST)
ret = btrfs_next_leaf(root, path);
else
@ -466,9 +469,12 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
/*
* We are searching for normal backref but bytenr of this leaf
* matches shared data backref.
* matches shared data backref, OR
* the leaf owner is not equal to the root we are searching for
*/
if (slot == 0 && is_shared_data_backref(preftrees, eb->start)) {
if (slot == 0 &&
(is_shared_data_backref(preftrees, eb->start) ||
ref->root_id != btrfs_header_owner(eb))) {
if (time_seq == SEQ_LAST)
ret = btrfs_next_leaf(root, path);
else