nilfs2: add routines to save and restore bmap state
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Mon, 30 Aug 2010 14:42:18 +0000 (23:42 +0900)
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Sat, 23 Oct 2010 00:24:37 +0000 (09:24 +0900)
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 <konishi.ryusuke@lab.ntt.co.jp>

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