From: Ian Kent <raven@themaw.net>
Date: Mon, 22 Nov 2010 02:21:38 +0000 (+0000)
Subject: Btrfs - fix race between btrfs_get_sb() and umount
X-Git-Tag: v2.6.37-rc4~6^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=619c8c763928841b1112e1d417f88bc1d44daecb;p=pandora-kernel.git

Btrfs - fix race between btrfs_get_sb() and umount

When mounting a btrfs file system btrfs_test_super() may attempt to
use sb->s_fs_info, the btrfs root, of a super block that is going away
and that has had the btrfs root set to NULL in its ->put_super(). But
if the super block is going away it cannot be an existing super block
so we can return false in this case.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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