tree 0e1d1a28578e8c1b2115b8486add3b235f7e3619
parent 2669b19fa4debcdd6a660ace1a124c0900f113e6
author Dave Chinner <dchinner@redhat.com> 1279007450 +1000
committer Jens Axboe <jaxboe@fusionio.com> 1281198389 +0200

blkdev: check for valid request queue before issuing flush

Issuing a blkdev_issue_flush() on an unconfigured loop device causes a panic as
q->make_request_fn is not configured. This can occur when trying to mount the
unconfigured loop device as an XFS filesystem. There are no guards that catch
the bio before the request function is called because we don't add a payload to
the bio. Instead, manually check this case as soon as we have a pointer to the
queue to flush.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>