This flag should be set for a virtual device iff it is set for all
underlying devices.
Signed-off-by: NNeil Brown <neilb@suse.de>
Acked-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>