[src/trunk]: src/sys/dev add support for DIOCGSTRATEGY and DIOCGCACHE

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

details:   https://anonhg.NetBSD.org/src/rev/9f6c782ef3fa
branches:  trunk
changeset: 930610:9f6c782ef3fa
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Fri Apr 10 10:53:02 2020 +0000

description:
add support for DIOCGSTRATEGY and DIOCGCACHE

only allow DIOCCACHESYNC if open for writing, same as everything supporting
DIOCCACHESYNC

diffstat:

 sys/dev/vnd.c |  24 ++++++++++++++++++++++--
 1 files changed, 22 insertions(+), 2 deletions(-)

diffs (59 lines):

diff -r bd072bb4483c -r 9f6c782ef3fa sys/dev/vnd.c
--- a/sys/dev/vnd.c     Fri Apr 10 10:32:18 2020 +0000
+++ b/sys/dev/vnd.c     Fri Apr 10 10:53:02 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vnd.c,v 1.274 2020/02/23 15:46:39 ad Exp $     */
+/*     $NetBSD: vnd.c,v 1.275 2020/04/10 10:53:02 jdolecek Exp $       */
 
 /*-
  * Copyright (c) 1996, 1997, 1998, 2008, 2020 The NetBSD Foundation, Inc.
@@ -91,7 +91,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.274 2020/02/23 15:46:39 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.275 2020/04/10 10:53:02 jdolecek Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_vnd.h"
@@ -1216,6 +1216,7 @@
 #endif
        case DIOCKLABEL:
        case DIOCWLABEL:
+       case DIOCCACHESYNC:
                if ((flag & FWRITE) == 0)
                        return EBADF;
        }
@@ -1231,6 +1232,8 @@
        case DIOCKLABEL:
        case DIOCWLABEL:
        case DIOCGDEFLABEL:
+       case DIOCGCACHE:
+       case DIOCGSTRATEGY:
        case DIOCCACHESYNC:
 #ifdef __HAVE_OLD_DISKLABEL
        case ODIOCGDINFO:
@@ -1645,6 +1648,23 @@
                break;
 #endif
 
+       case DIOCGSTRATEGY:
+           {
+               struct disk_strategy *dks = (void *)data;
+
+               /* No lock needed, never changed */
+               strlcpy(dks->dks_name,
+                   bufq_getstrategyname(vnd->sc_tab),
+                   sizeof(dks->dks_name));
+               dks->dks_paramlen = 0;
+               break;
+           }
+       case DIOCGCACHE:
+           {
+               int *bits = (int *)data;
+               *bits |= DKCACHE_READ | DKCACHE_WRITE;
+               break;
+           }
        case DIOCCACHESYNC:
                vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY);
                error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred,