Btrfs: Change find_extent_buffer to use TestSetPageLocked

This makes it possible for callers to check for extent_buffers in cache
without deadlocking against any btree locks held.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a9b3a25a45b7..dc3c03c6612d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1438,7 +1438,6 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
         int err = 0;
 
         if (!pending) {
-#if 0
                 struct extent_buffer *buf;
                 buf = btrfs_find_tree_block(root, bytenr, num_bytes);
                 if (buf) {
@@ -1460,7 +1459,6 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
                         }
                         free_extent_buffer(buf);
                 }
-#endif
                 update_pinned_extents(root, bytenr, num_bytes, 1);
         } else {
                 set_extent_bits(&root->fs_info->pending_del,