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nilfs2: add truncation routine of segment usage file
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Wed, 4 May 2011 16:23:58 +0000 (01:23 +0900)
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tue, 10 May 2011 13:21:45 +0000 (22:21 +0900)
When shrinking the filesystem, segments to be truncated must be test
if they are busy or not, and unneeded sufile block should be deleted.
This adds routines for the truncation.

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

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