pstore/ram: Use memcpy_toio instead of memcpy

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / backref.c

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index d453d62ab0c6e322b3c0df0a05b20daa6751d5ad..e2f659dc57457535783f4ce4848df0e770571f0f 100644 (file)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1417,7 +1417,8 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
                        read_extent_buffer(eb, dest + bytes_left,
                                           name_off, name_len);
                if (eb != eb_in) {
-                       btrfs_tree_read_unlock_blocking(eb);
+                       if (!path->skip_locking)
+                               btrfs_tree_read_unlock_blocking(eb);
                        free_extent_buffer(eb);
                }
                ret = btrfs_find_item(fs_root, path, parent, 0,
@@ -1437,9 +1438,10 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
                eb = path->nodes[0];
                /* make sure we can use eb after releasing the path */
                if (eb != eb_in) {
-                       atomic_inc(&eb->refs);
-                       btrfs_tree_read_lock(eb);
-                       btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+                       if (!path->skip_locking)
+                               btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+                       path->nodes[0] = NULL;
+                       path->locks[0] = 0;
                }
                btrfs_release_path(path);
                iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);