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/*-
* 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 <sys/disk.h>
#include <stand.h>
#include <stdarg.h>
#include <bootstrap.h>
#include "disk.h"
#include "libuserboot.h"
struct userdisk_info {
uint64_t mediasize;
uint16_t sectorsize;
int ud_open; /* reference counter */
void *ud_bcache; /* buffer cache data */
};
int userboot_disk_maxunit = 0;
static int userdisk_maxunit = 0;
static struct userdisk_info *ud_info;
static int userdisk_init(void);
static void userdisk_cleanup(void);
static int userdisk_strategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize);
static int userdisk_realstrategy(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 int userdisk_ioctl(struct open_file *f, u_long cmd, void *data);
static int userdisk_print(int verbose);
struct devsw userboot_disk = {
"disk",
DEVT_DISK,
userdisk_init,
userdisk_strategy,
userdisk_open,
userdisk_close,
userdisk_ioctl,
userdisk_print,
userdisk_cleanup
};
/*
* Initialize userdisk_info structure for each disk.
*/
static int
userdisk_init(void)
{
off_t mediasize;
u_int sectorsize;
int i;
userdisk_maxunit = userboot_disk_maxunit;
if (userdisk_maxunit > 0) {
ud_info = malloc(sizeof(*ud_info) * userdisk_maxunit);
if (ud_info == NULL)
return (ENOMEM);
for (i = 0; i < userdisk_maxunit; i++) {
if (CALLBACK(diskioctl, i, DIOCGSECTORSIZE,
§orsize) != 0 || CALLBACK(diskioctl, i,
DIOCGMEDIASIZE, &mediasize) != 0)
return (ENXIO);
ud_info[i].mediasize = mediasize;
ud_info[i].sectorsize = sectorsize;
ud_info[i].ud_open = 0;
ud_info[i].ud_bcache = NULL;
}
}
bcache_add_dev(userdisk_maxunit);
return(0);
}
static void
userdisk_cleanup(void)
{
if (userdisk_maxunit > 0)
free(ud_info);
}
/*
* Print information about disks
*/
static int
userdisk_print(int verbose)
{
struct disk_devdesc dev;
char line[80];
int i, ret = 0;
if (userdisk_maxunit == 0)
return (0);
printf("%s devices:", userboot_disk.dv_name);
if ((ret = pager_output("\n")) != 0)
return (ret);
for (i = 0; i < userdisk_maxunit; i++) {
snprintf(line, sizeof(line),
" disk%d: Guest drive image\n", i);
ret = pager_output(line);
if (ret != 0)
break;
dev.dd.d_dev = &userboot_disk;
dev.dd.d_unit = i;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
if (disk_open(&dev, ud_info[i].mediasize,
ud_info[i].sectorsize) == 0) {
snprintf(line, sizeof(line), " disk%d", i);
ret = disk_print(&dev, line, verbose);
disk_close(&dev);
if (ret != 0)
break;
}
}
return (ret);
}
/*
* 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->dd.d_unit < 0 || dev->dd.d_unit >= userdisk_maxunit)
return (EIO);
ud_info[dev->dd.d_unit].ud_open++;
if (ud_info[dev->dd.d_unit].ud_bcache == NULL)
ud_info[dev->dd.d_unit].ud_bcache = bcache_allocate();
return (disk_open(dev, ud_info[dev->dd.d_unit].mediasize,
ud_info[dev->dd.d_unit].sectorsize));
}
static int
userdisk_close(struct open_file *f)
{
struct disk_devdesc *dev;
dev = (struct disk_devdesc *)f->f_devdata;
ud_info[dev->dd.d_unit].ud_open--;
if (ud_info[dev->dd.d_unit].ud_open == 0) {
bcache_free(ud_info[dev->dd.d_unit].ud_bcache);
ud_info[dev->dd.d_unit].ud_bcache = NULL;
}
return (disk_close(dev));
}
static int
userdisk_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
char *buf, size_t *rsize)
{
struct bcache_devdata bcd;
struct disk_devdesc *dev;
dev = (struct disk_devdesc *)devdata;
bcd.dv_strategy = userdisk_realstrategy;
bcd.dv_devdata = devdata;
bcd.dv_cache = ud_info[dev->dd.d_unit].ud_bcache;
return (bcache_strategy(&bcd, rw, dblk + dev->d_offset,
size, buf, rsize));
}
static int
userdisk_realstrategy(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 (rsize)
*rsize = 0;
off = dblk * ud_info[dev->dd.d_unit].sectorsize;
switch (rw & F_MASK) {
case F_READ:
rc = CALLBACK(diskread, dev->dd.d_unit, off, buf, size, &resid);
break;
case F_WRITE:
rc = CALLBACK(diskwrite, dev->dd.d_unit, off, buf, size,
&resid);
break;
default:
rc = EINVAL;
break;
}
if (rc)
return (rc);
if (rsize)
*rsize = size - resid;
return (0);
}
static int
userdisk_ioctl(struct open_file *f, u_long cmd, void *data)
{
struct disk_devdesc *dev;
int rc;
dev = (struct disk_devdesc *)f->f_devdata;
rc = disk_ioctl(dev, cmd, data);
if (rc != ENOTTY)
return (rc);
return (CALLBACK(diskioctl, dev->dd.d_unit, cmd, data));
}
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