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On-memory inode structures of nilfs have a member "i_cno" which stores a checkpoint number related to the inode. For gc-inodes, this field indicates version of data each gc-inode caches for GC. Log writer temporarily uses "i_cno" to transfer the latest checkpoint number. This stops the latter use and lets only gc-inodes use it. The purpose of this patch is to allow the successive change use "i_cno" for inode lookup. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>