[src/trunk]: src/sys/sys Add DK_DEV_BSIZE_OK()

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

details:   https://anonhg.NetBSD.org/src/rev/ee29dc271fc1
branches:  trunk
changeset: 811724:ee29dc271fc1
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Nov 12 15:25:22 2015 +0000

description:
Add DK_DEV_BSIZE_OK()

diffstat:

 sys/sys/disk.h |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (18 lines):

diff -r 73e5d4c394f0 -r ee29dc271fc1 sys/sys/disk.h
--- a/sys/sys/disk.h    Thu Nov 12 15:13:03 2015 +0000
+++ b/sys/sys/disk.h    Thu Nov 12 15:25:22 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: disk.h,v 1.65 2015/08/16 18:00:03 mlelstv Exp $        */
+/*     $NetBSD: disk.h,v 1.66 2015/11/12 15:25:22 christos Exp $       */
 
 /*-
  * Copyright (c) 1996, 1997, 2004 The NetBSD Foundation, Inc.
@@ -519,6 +519,8 @@
 
 #define        DK_BSIZE2BLKSHIFT(b)    ((ffs((b) / DEV_BSIZE)) - 1)
 #define        DK_BSIZE2BYTESHIFT(b)   (ffs((b)) - 1)
+#define DK_DEV_BSIZE_OK(b) \
+    ((b) >= DEV_BSIZE && ((b) & ((b) - 1)) == 0 && (b) <= MAXPHYS)
 
 #ifdef _KERNEL
 extern int disk_count;                 /* number of disks in global disklist */