btrfs: extent-tree: Use btrfs_ref to refactor add_pinned_bytes()

Since add_pinned_bytes() only needs to know if the extent is metadata
and if it's a chunk tree extent, btrfs_ref is a perfect match for it, as
we don't need various owner/level trick to determine extent type.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -756,14 +756,15 @@ 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,
-			     bool metadata, u64 root_objectid)
+static void add_pinned_bytes(struct btrfs_fs_info *fs_info,
+			     struct btrfs_ref *ref)
 {
 	struct btrfs_space_info *space_info;
+	s64 num_bytes = -ref->len;
 	u64 flags;
 
-	if (metadata) {
-		if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
+	if (ref->type == BTRFS_REF_METADATA) {
+		if (ref->tree_ref.root == BTRFS_CHUNK_TREE_OBJECTID)
 			flags = BTRFS_BLOCK_GROUP_SYSTEM;
 		else
 			flags = BTRFS_BLOCK_GROUP_METADATA;
@@ -2069,11 +2070,8 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 
 	btrfs_ref_tree_mod(fs_info, &generic_ref);
 
-	if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) {
-		bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID;
-
-		add_pinned_bytes(fs_info, -num_bytes, metadata, root_objectid);
-	}
+	if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0)
+		add_pinned_bytes(fs_info, &generic_ref);
 
 	return ret;
 }
@@ -7221,8 +7219,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 	}
 out:
 	if (pin)
-		add_pinned_bytes(fs_info, buf->len, true,
-				 root->root_key.objectid);
+		add_pinned_bytes(fs_info, &generic_ref);
 
 	if (last_ref) {
 		/*
@@ -7273,11 +7270,8 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans,
 	if (root_objectid != BTRFS_TREE_LOG_OBJECTID)
 		btrfs_ref_tree_mod(fs_info, &generic_ref);
 
-	if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) {
-		bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID;
-
-		add_pinned_bytes(fs_info, num_bytes, metadata, root_objectid);
-	}
+	if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0)
+		add_pinned_bytes(fs_info, &generic_ref);
 
 	return ret;
 }