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

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commit cfc0eed0ec89db7c4a8d461174cabfaa4a0912c7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
ethanwu 2020-02-07 17:38:17 +08:00 committed by Greg Kroah-Hartman
parent c3089b06d6
commit 66bcf5f6f9
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