1 files changed, 32 insertions, 4 deletions

diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index f2c507fd0e04..03fe4154ffb8 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -25,6 +25,35 @@ static inline u64 btrfs_sb_offset(int mirror)
 	return BTRFS_SUPER_INFO_OFFSET;
 }
 
+/* All the extra info needed to verify the parentness of a tree block. */
+struct btrfs_tree_parent_check {
+	/*
+	 * The owner check against the tree block.
+	 *
+	 * Can be 0 to skip the owner check.
+	 */
+	u64 owner_root;
+
+	/*
+	 * Expected transid, can be 0 to skip the check, but such skip
+	 * should only be utlized for backref walk related code.
+	 */
+	u64 transid;
+
+	/*
+	 * The expected first key.
+	 *
+	 * This check can be skipped if @has_first_key is false, such skip
+	 * can happen for case where we don't have the parent node key,
+	 * e.g. reading the tree root, doing backref walk.
+	 */
+	struct btrfs_key first_key;
+	bool has_first_key;
+
+	/* The expected level. Should always be set. */
+	u8 level;
+};
+
 struct btrfs_device;
 struct btrfs_fs_devices;
 
@@ -33,8 +62,7 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
 			   struct btrfs_key *first_key, u64 parent_transid);
 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
-				      u64 owner_root, u64 parent_transid,
-				      int level, struct btrfs_key *first_key);
+				      struct btrfs_tree_parent_check *check);
 struct extent_buffer *btrfs_find_create_tree_block(
 						struct btrfs_fs_info *fs_info,
 						u64 bytenr, u64 owner_root,
@@ -111,8 +139,8 @@ void btrfs_put_root(struct btrfs_root *root);
 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
 			  int atomic);
-int btrfs_read_extent_buffer(struct extent_buffer *buf, u64 parent_transid,
-			     int level, struct btrfs_key *first_key);
+int btrfs_read_extent_buffer(struct extent_buffer *buf,
+			     struct btrfs_tree_parent_check *check);
 
 enum btrfs_wq_submit_cmd {
 	WQ_SUBMIT_METADATA,