tree 23fc73cf043faac2cdb15a0b22e6e9e29a69797a
parent bc1cbf1f86aa2501efa9ca637c736fce6bcc4b1d
author Ian Kent <raven@themaw.net> 1290392498 +0000
committer Chris Mason <chris.mason@oracle.com> 1290883064 -0500

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>