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374e2e06e6
If the minimum checkpoint number of valid checkpoints is large to some
extent, "lscp -r" command takes very long time:
$ lscp -r
CNO DATE TIME MODE FLG BLKCNT ICNT
6541269 2015-02-11 18:38:30 cp - 435 2
6541268 2015-02-11 18:38:25 cp - 484 51
<the command looks to enter a busy loop>
This is because it tries to find younger checkpoints tracking back the
checkpoint list in a constant step size.
This fixes the issue by lengthening or shortening the step size
depending on whether the backward search found a younger checkpoint or
not.
This patch also inserts a dummy nilfs_get_cpinfo() call before
starting the backward search to make successive nilfs_get_cpinfo()
calls much faster.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>