Btrfs: make add_pinned_bytes() take an s64 num_bytes instead of u64

There are a few places where we pass in a negative num_bytes, so make it
signed for clarity. Also move it up in the file since later patches will
need it there.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -767,6 +767,26 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
 	return NULL;
 }
 
+static void add_pinned_bytes(struct btrfs_fs_info *fs_info, s64 num_bytes,
+			     u64 owner, u64 root_objectid)
+{
+	struct btrfs_space_info *space_info;
+	u64 flags;
+
+	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
+		if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
+			flags = BTRFS_BLOCK_GROUP_SYSTEM;
+		else
+			flags = BTRFS_BLOCK_GROUP_METADATA;
+	} else {
+		flags = BTRFS_BLOCK_GROUP_DATA;
+	}
+
+	space_info = __find_space_info(fs_info, flags);
+	BUG_ON(!space_info); /* Logic bug */
+	percpu_counter_add(&space_info->total_bytes_pinned, num_bytes);
+}
+
 /*
  * after adding space to the filesystem, we need to clear the full flags
  * on all the space infos.
@@ -6808,27 +6828,6 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 	return 0;
 }
 
-static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes,
-			     u64 owner, u64 root_objectid)
-{
-	struct btrfs_space_info *space_info;
-	u64 flags;
-
-	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
-		if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
-			flags = BTRFS_BLOCK_GROUP_SYSTEM;
-		else
-			flags = BTRFS_BLOCK_GROUP_METADATA;
-	} else {
-		flags = BTRFS_BLOCK_GROUP_DATA;
-	}
-
-	space_info = __find_space_info(fs_info, flags);
-	BUG_ON(!space_info); /* Logic bug */
-	percpu_counter_add(&space_info->total_bytes_pinned, num_bytes);
-}
-
-
 static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 				struct btrfs_fs_info *info,
 				struct btrfs_delayed_ref_node *node, u64 parent,