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path: root/fs/btrfs/backref.c
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Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 78556447e1d5..11459fe84a29 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -712,7 +712,7 @@ out:
* read tree blocks and add keys where required.
*/
static int add_missing_keys(struct btrfs_fs_info *fs_info,
- struct preftrees *preftrees)
+ struct preftrees *preftrees, bool lock)
{
struct prelim_ref *ref;
struct extent_buffer *eb;
@@ -737,12 +737,14 @@ static int add_missing_keys(struct btrfs_fs_info *fs_info,
free_extent_buffer(eb);
return -EIO;
}
- btrfs_tree_read_lock(eb);
+ if (lock)
+ btrfs_tree_read_lock(eb);
if (btrfs_header_level(eb) == 0)
btrfs_item_key_to_cpu(eb, &ref->key_for_search, 0);
else
btrfs_node_key_to_cpu(eb, &ref->key_for_search, 0);
- btrfs_tree_read_unlock(eb);
+ if (lock)
+ btrfs_tree_read_unlock(eb);
free_extent_buffer(eb);
prelim_ref_insert(fs_info, &preftrees->indirect, ref, NULL);
cond_resched();
@@ -1227,7 +1229,7 @@ again:
btrfs_release_path(path);
- ret = add_missing_keys(fs_info, &preftrees);
+ ret = add_missing_keys(fs_info, &preftrees, path->skip_locking == 0);
if (ret)
goto out;
@@ -1288,11 +1290,15 @@ again:
ret = -EIO;
goto out;
}
- btrfs_tree_read_lock(eb);
- btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+
+ if (!path->skip_locking) {
+ btrfs_tree_read_lock(eb);
+ btrfs_set_lock_blocking_read(eb);
+ }
ret = find_extent_in_eb(eb, bytenr,
*extent_item_pos, &eie, ignore_offset);
- btrfs_tree_read_unlock_blocking(eb);
+ if (!path->skip_locking)
+ btrfs_tree_read_unlock_blocking(eb);
free_extent_buffer(eb);
if (ret < 0)
goto out;
@@ -1650,7 +1656,7 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
/* make sure we can use eb after releasing the path */
if (eb != eb_in) {
if (!path->skip_locking)
- btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+ btrfs_set_lock_blocking_read(eb);
path->nodes[0] = NULL;
path->locks[0] = 0;
}