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 <[email protected]> Signed-off-by: Josef Bacik <[email protected]> Signed-off-by: Chris Mason <[email protected]>
cbmeeks · Mar 14, 2013 · a09a0a7 · a09a0a7
1 parent de3cb94
commit a09a0a7
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
@@ -2312,6 +2312,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
 	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 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
 
 	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 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
 	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,