[src/trunk]: src/sys/arch/xen/xen when checking for physio request check for ...

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

details:   https://anonhg.NetBSD.org/src/rev/77f563f272c2
branches:  trunk
changeset: 971168:77f563f272c2
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Thu Apr 16 09:51:40 2020 +0000

description:
when checking for physio request check for B_PHYS in b_flags rather
than an internal field, so this works when the original buf is
wrapped by another one by e.g. dk(4)

fixes misfired assert when doing newfs on a wedge, reported by Manuel Bouyer

diffstat:

 sys/arch/xen/xen/xbd_xenbus.c |  11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diffs (32 lines):

diff -r 23b5ef04faa7 -r 77f563f272c2 sys/arch/xen/xen/xbd_xenbus.c
--- a/sys/arch/xen/xen/xbd_xenbus.c     Thu Apr 16 09:28:52 2020 +0000
+++ b/sys/arch/xen/xen/xbd_xenbus.c     Thu Apr 16 09:51:40 2020 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: xbd_xenbus.c,v 1.114 2020/04/15 10:16:47 jdolecek Exp $      */
+/*      $NetBSD: xbd_xenbus.c,v 1.115 2020/04/16 09:51:40 jdolecek Exp $      */
 
 /*
  * Copyright (c) 2006 Manuel Bouyer.
@@ -50,7 +50,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xbd_xenbus.c,v 1.114 2020/04/15 10:16:47 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xbd_xenbus.c,v 1.115 2020/04/16 09:51:40 jdolecek Exp $");
 
 #include "opt_xen.h"
 
@@ -1207,8 +1207,11 @@
 static int
 xbd_map_align(struct xbd_xenbus_softc *sc, struct xbd_req *req)
 {
-       /* Only can get here if this is physio() request */
-       KASSERT(req->req_bp->b_saveaddr != NULL);
+       /*
+        * Only can get here if this is physio() request, block I/O
+        * uses DEV_BSIZE-aligned buffers.
+        */
+       KASSERT((req->req_bp->b_flags & B_PHYS) != 0);
 
        sc->sc_cnt_map_unalign.ev_count++;