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nilfs2: apply readahead for recovery on mount
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Thu, 19 Nov 2009 13:24:48 +0000 (22:24 +0900)
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Fri, 20 Nov 2009 01:05:51 +0000 (10:05 +0900)
This inserts readahead in the recovery code.  The readahead request is
issued per segment while searching the latest super root block.

This will shorten mount time after unclean unmount.  A measurement
shows the recovery time was reduced by more than 60 percent:

 e.g. real  0m11.586s -> 0m3.918s  (x 2.96)

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

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