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btrfs: fix locking issues in find_parent_nodes()

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- We might unlock head->mutex while it was not locked
- We might leave the function without unlocking delayed_refs->lock

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Li Zefan 2012-03-03 07:41:15 -05:00 committed by Chris Mason
parent e77266e4c4
commit d3b010640e
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/backref.c
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@ -583,7 +583,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct btrfs_path *path;
struct btrfs_key info_key = { 0 };
struct btrfs_delayed_ref_root *delayed_refs = NULL;
struct btrfs_delayed_ref_head *head = NULL;
struct btrfs_delayed_ref_head *head;
int info_level = 0;
int ret;
struct list_head prefs_delayed;
@ -607,6 +607,8 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
* at a specified point in time
*/
again:
head = NULL;
ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
@ -635,8 +637,10 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
goto again;
}
ret = __add_delayed_refs(head, seq, &info_key, &prefs_delayed);
if (ret)
if (ret) {
spin_unlock(&delayed_refs->lock);
goto out;
}
}
spin_unlock(&delayed_refs->lock);