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| author | Liu Bo <bo.li.liu@oracle.com> | 2015-07-28 18:03:30 +0800 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-08-09 07:33:50 -0700 |
| commit | acdf898de8903f50bb10bbce4b774432bcd63c85 (patch) | |
| tree | 79d2c35cc5ec383bb0edff3ec5c116b4c902622b /fs/btrfs/backref.c | |
| parent | 166f66d0bc94a14ec4bc6ee6ab079532df4a8d9e (diff) | |
| download | linux-stable-acdf898de8903f50bb10bbce4b774432bcd63c85.tar.gz linux-stable-acdf898de8903f50bb10bbce4b774432bcd63c85.tar.bz2 linux-stable-acdf898de8903f50bb10bbce4b774432bcd63c85.zip | |
Btrfs: fix warning in backref walking
When we do backref walking, we search firstly in queued delayed refs
and then the on-disk backrefs, but we parse differently for shared
references, for delayed refs we also add 'ref->root' while for on-disk
backrefs we don't, this can prevent us from merging refs indexed
by the same bytenr and cause find_parent_nodes() to throw a warning at
'WARN_ON(ref->count < 0)', for example, when we have a shared data extent
with 'ref_cnt=1' and a delayed shared data with a BTRFS_DROP_DELAYED_REF,
that happens.
For shared references, no matter if it's delayed or on-disk, ref->root is
not at all used, instead it's ref->parent that really matters, so this has
delayed refs handled as the same way as on-disk refs.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/backref.c')
| -rw-r--r-- | fs/btrfs/backref.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index a0ca5757a3ff..ecbc63d3143e 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -655,7 +655,7 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, struct btrfs_delayed_tree_ref *ref; ref = btrfs_delayed_node_to_tree_ref(node); - ret = __add_prelim_ref(prefs, ref->root, NULL, + ret = __add_prelim_ref(prefs, 0, NULL, ref->level + 1, ref->parent, node->bytenr, node->ref_mod * sgn, GFP_ATOMIC); @@ -687,11 +687,7 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, struct btrfs_delayed_data_ref *ref; ref = btrfs_delayed_node_to_data_ref(node); - - key.objectid = ref->objectid; - key.type = BTRFS_EXTENT_DATA_KEY; - key.offset = ref->offset; - ret = __add_prelim_ref(prefs, ref->root, &key, 0, + ret = __add_prelim_ref(prefs, 0, NULL, 0, ref->parent, node->bytenr, node->ref_mod * sgn, GFP_ATOMIC); break; |