1287793477 +0900 nilfs2: add routines to save and restore bmap state This adds routines to save and restore the state of bmap structure. The bmap state is stored in a given nilfs_bmap_store object. These routines will be used to roll back the state of dat inode without using gcdat inode. Signed-off-by: Ryusuke Konishi Š Å»—#x