From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 27 Jun 2013 10:51:00 +0000 (+0800)
Subject: Btrfs: fix several potential problems in copy_nocow_pages_for_inode
X-Git-Tag: v3.11-rc1~70^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edd1400be9f983f521c7397740d810fa210ee52f;p=pandora-kernel.git

Btrfs: fix several potential problems in copy_nocow_pages_for_inode

- It makes no sense that we deal with a inode in the dead tree.
- fix the race between dio and page copy by waiting the dio completion
- avoid the page copy vs truncate/punch hole
- check if the page is in the page cache or not

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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