[src/trunk]: src/sys/dev pass also DIOCGCACHE to underlying device, so that u...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b96cee257e25
branches:  trunk
changeset: 822062:b96cee257e25
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Mon Feb 27 21:25:45 2017 +0000

description:
pass also DIOCGCACHE to underlying device, so that upper layers would be able
to get device cache properties without knowing the topology

diffstat:

 sys/dev/cgd.c |  14 +++++---------
 1 files changed, 5 insertions(+), 9 deletions(-)

diffs (36 lines):

diff -r 238ead173f37 -r b96cee257e25 sys/dev/cgd.c
--- a/sys/dev/cgd.c     Mon Feb 27 20:29:00 2017 +0000
+++ b/sys/dev/cgd.c     Mon Feb 27 21:25:45 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cgd.c,v 1.113 2016/12/22 20:57:33 kamil Exp $ */
+/* $NetBSD: cgd.c,v 1.114 2017/02/27 21:25:45 jdolecek Exp $ */
 
 /*-
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cgd.c,v 1.113 2016/12/22 20:57:33 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cgd.c,v 1.114 2017/02/27 21:25:45 jdolecek Exp $");
 
 #include <sys/types.h>
 #include <sys/param.h>
@@ -715,14 +715,10 @@
                if (DK_BUSY(&cs->sc_dksc, pmask))
                        return EBUSY;
                return cgd_ioctl_clr(cs, l);
+       case DIOCGCACHE:
        case DIOCCACHESYNC:
-               /*
-                * XXX Do we really need to care about having a writable
-                * file descriptor here?
-                */
-               if ((flag & FWRITE) == 0)
-                       return (EBADF);
-
+               if (!DK_ATTACHED(dksc))
+                       return ENOENT;
                /*
                 * We pass this call down to the underlying disk.
                 */