1 files changed, 146 insertions, 0 deletions
diff --git a/sys/boot/userboot/userboot/userboot_disk.c b/sys/boot/userboot/userboot/userboot_disk.c
new file mode 100644
index 0000000..074d3e1
--- /dev/null
+++ b/sys/boot/userboot/userboot/userboot_disk.c
@@ -0,0 +1,146 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Userboot disk image handling.
+ */
+
+#include <stand.h>
+
+#include <stdarg.h>
+#include <uuid.h>
+
+#include <bootstrap.h>
+
+#include "disk.h"
+#include "libuserboot.h"
+
+int userboot_disk_maxunit = 0;
+
+static int	userdisk_init(void);
+static int	userdisk_strategy(void *devdata, int flag, daddr_t dblk,
+		    size_t size, char *buf, size_t *rsize);
+static int	userdisk_open(struct open_file *f, ...);
+static int	userdisk_close(struct open_file *f);
+static void	userdisk_print(int verbose);
+
+struct devsw userboot_disk = {
+	"disk",
+	DEVT_DISK,
+	userdisk_init,
+	userdisk_strategy,
+	userdisk_open,
+	userdisk_close,
+	noioctl,
+	userdisk_print,
+	NULL
+};
+
+/*
+ * Nothing to do here.
+ */
+static int
+userdisk_init(void)
+{
+
+	return(0);
+}
+
+/*
+ * Print information about disks
+ */
+static void
+userdisk_print(int verbose)
+{
+	int			i;
+	char			line[80];
+	struct disk_devdesc	dev;
+
+	for (i = 0; i < userboot_disk_maxunit; i++) {
+		sprintf(line, "    disk%d:   Guest drive image\n", i);
+		pager_output(line);
+		dev.d_dev = &userboot_disk;
+		dev.d_unit = i;
+		dev.d_slice = -1;
+		dev.d_partition = -1;
+		dev.d_offset = 0;
+		sprintf(line, "    disk%d", i);
+		disk_print(&dev, line, verbose);
+	}
+}
+
+/*
+ * Attempt to open the disk described by (dev) for use by (f).
+ */
+static int
+userdisk_open(struct open_file *f, ...)
+{
+	va_list			ap;
+	struct disk_devdesc	*dev;
+
+	va_start(ap, f);
+	dev = va_arg(ap, struct disk_devdesc *);
+	va_end(ap);
+
+	if (dev->d_unit < 0 || dev->d_unit >= userboot_disk_maxunit)
+		return (EIO);
+
+	return (disk_open(dev));
+}
+
+static int
+userdisk_close(struct open_file *f)
+{
+
+	return(0);
+}
+
+static int
+userdisk_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
+    char *buf, size_t *rsize)
+{
+	struct disk_devdesc *dev = devdata;
+	uint64_t	off;
+	size_t		resid;
+	int		rc;
+
+	if (rw == F_WRITE)
+		return (EROFS);
+	if (rw != F_READ)
+		return (EINVAL);
+	if (rsize)
+		*rsize = 0;
+	off = (dblk + dev->d_offset) * DISK_SECSIZE;
+	rc = CALLBACK(diskread, dev->d_unit, off, buf, size, &resid);
+	if (rc)
+		return (rc);
+	if (rsize)
+		*rsize = size - resid;
+	return (0);
+}