Btrfs: get better concurrency for snapshot-aware defrag work

Using spinning case instead of blocking will result in better concurrency
overall.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 13ab4de0a400..1f26888825e2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2312,6 +2312,7 @@ again:
         key.type = BTRFS_EXTENT_DATA_KEY;
         key.offset = start;
 
+        path->leave_spinning = 1;
         if (merge) {
                 struct btrfs_file_extent_item *fi;
                 u64 extent_len;
@@ -2368,6 +2369,7 @@ again:
 
         btrfs_mark_buffer_dirty(leaf);
         inode_add_bytes(inode, len);
+        btrfs_release_path(path);
 
         ret = btrfs_inc_extent_ref(trans, root, new->bytenr,
                         new->disk_len, 0,
@@ -2381,6 +2383,7 @@ again:
         ret = 1;
 out_free_path:
         btrfs_release_path(path);
+        path->leave_spinning = 0;
         btrfs_end_transaction(trans, root);
 out_unlock:
         unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end,