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| author | ethanwu <ethanwu@synology.com> | 2020-02-07 17:38:17 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-03-23 17:01:40 +0100 |
| commit | cfc0eed0ec89db7c4a8d461174cabfaa4a0912c7 (patch) | |
| tree | 5f0b20b8464113a5508a6f35baa2e5503a4cf5b2 /fs/btrfs/backref.c | |
| parent | ed58f2e66e849c34826083e5a6c1b506ee8a4d8e (diff) | |
| download | linux-stable-cfc0eed0ec89db7c4a8d461174cabfaa4a0912c7.tar.gz linux-stable-cfc0eed0ec89db7c4a8d461174cabfaa4a0912c7.tar.bz2 linux-stable-cfc0eed0ec89db7c4a8d461174cabfaa4a0912c7.zip | |
btrfs: backref, only search backref entries from leaves of the same root
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>
Diffstat (limited to 'fs/btrfs/backref.c')
| -rw-r--r-- | fs/btrfs/backref.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 04e9d2efa958..19a3ae79a0a8 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -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 |