Module Name: src
Committed By: jdolecek
Date: Tue Apr 14 09:27:28 UTC 2020
Modified Files:
src/sys/arch/xen/xen: xbd_xenbus.c
Log Message:
provide d_iosize hook to cap the xfer size used for dumps
To generate a diff of this commit:
cvs rdiff -u -r1.108 -r1.109 src/sys/arch/xen/xen/xbd_xenbus.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/xen/xen/xbd_xenbus.c
diff -u src/sys/arch/xen/xen/xbd_xenbus.c:1.108 src/sys/arch/xen/xen/xbd_xenbus.c:1.109
--- src/sys/arch/xen/xen/xbd_xenbus.c:1.108 Tue Apr 14 08:21:59 2020
+++ src/sys/arch/xen/xen/xbd_xenbus.c Tue Apr 14 09:27:28 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: xbd_xenbus.c,v 1.108 2020/04/14 08:21:59 jdolecek Exp $ */
+/* $NetBSD: xbd_xenbus.c,v 1.109 2020/04/14 09:27:28 jdolecek Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
@@ -50,7 +50,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xbd_xenbus.c,v 1.108 2020/04/14 08:21:59 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xbd_xenbus.c,v 1.109 2020/04/14 09:27:28 jdolecek Exp $");
#include "opt_xen.h"
@@ -176,6 +176,7 @@ static bool xbd_xenbus_resume(device_t,
static int xbd_handler(void *);
static int xbd_diskstart(device_t, struct buf *);
+static void xbd_iosize(device_t, int *);
static void xbd_backend_changed(void *, XenbusState);
static void xbd_connect(struct xbd_xenbus_softc *);
@@ -231,6 +232,7 @@ static struct dkdriver xbddkdriver = {
.d_open = xbdopen,
.d_close = xbdclose,
.d_diskstart = xbd_diskstart,
+ .d_iosize = xbd_iosize,
};
static int
@@ -775,6 +777,17 @@ xbdminphys(struct buf *bp)
minphys(bp);
}
+static void
+xbd_iosize(device_t dev, int *maxxfer)
+{
+ /*
+ * Always restrict dumps to XBD_MAX_XFER to avoid indirect segments,
+ * so that it uses as little memory as possible.
+ */
+ if (*maxxfer > XBD_MAX_XFER)
+ *maxxfer = XBD_MAX_XFER;
+}
+
int
xbdopen(dev_t dev, int flags, int fmt, struct lwp *l)
{
