{
struct btrfs_fs_info *fs_info = root->fs_info;
struct extent_buffer *b;
- int root_lock;
+ int root_lock = 0;
int level = 0;
- /* We try very hard to do read locks on the root */
- root_lock = BTRFS_READ_LOCK;
-
if (p->search_commit_root) {
/*
* The commit roots are read only so we always do read locks,
goto out;
}
+ /* We try very hard to do read locks on the root */
+ root_lock = BTRFS_READ_LOCK;
+
/*
* If the level is set to maximum, we can skip trying to get the read
* lock.
level = btrfs_header_level(b);
out:
+ /*
+ * The root may have failed to write out at some point, and thus is no
+ * longer valid, return an error in this case.
+ */
+ if (!extent_buffer_uptodate(b)) {
+ if (root_lock)
+ btrfs_tree_unlock_rw(b, root_lock);
+ free_extent_buffer(b);
+ return ERR_PTR(-EIO);
+ }
+
p->nodes[level] = b;
if (!p->skip_locking)
p->locks[level] = root_lock;