From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 2 Sep 2011 07:56:39 +0000 (+0800)
Subject: Btrfs: use i_size_read() in btrfs_defrag_file()
X-Git-Tag: v3.2-rc1~21^2~23^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=151a31b25e5c941bdd9fdefed650effca223c716;p=pandora-kernel.git

Btrfs: use i_size_read() in btrfs_defrag_file()

Don't use inode->i_size directly, since we're not holding i_mutex.

This also fixes another bug, that i_size can change after it's checked
against 0 and then (i_size - 1) can be negative.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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