From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Wed, 4 May 2011 16:23:58 +0000 (+0900)
Subject: nilfs2: add truncation routine of segment usage file
X-Git-Tag: v3.0-rc1~355^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78eb64c2479e0f408b725c3c8e1cdf557857af48;p=pandora-kernel.git

nilfs2: add truncation routine of segment usage file

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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