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/*
* Copyright (c) 2007, XenSource 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:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
* 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 <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/statvfs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <string.h>
#include "blk.h"
#include "tapdisk.h"
#include "tapdisk-driver.h"
#include "tapdisk-interface.h"
char *img;
long int disksector_size;
long int disksize;
long int diskinfo;
static int connections = 0;
struct tdram_state {
int fd;
};
/*Get Image size, secsize*/
static int get_image_info(int fd, td_disk_info_t *info)
{
int ret;
long size;
unsigned long total_size;
struct statvfs statBuf;
struct stat stat;
ret = fstat(fd, &stat);
if (ret != 0) {
DPRINTF("ERROR: fstat failed, Couldn't stat image");
return -EINVAL;
}
if (S_ISBLK(stat.st_mode)) {
/*Accessing block device directly*/
info->size = 0;
if (blk_getimagesize(fd, &info->size) != 0)
return -EINVAL;
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(info->size << SECTOR_SHIFT),
(long long unsigned)info->size);
/*Get the sector size*/
if (blk_getsectorsize(fd, &info->sector_size) != 0)
info->sector_size = DEFAULT_SECTOR_SIZE;
} else {
/*Local file? try fstat instead*/
info->size = (stat.st_size >> SECTOR_SHIFT);
info->sector_size = DEFAULT_SECTOR_SIZE;
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(info->size << SECTOR_SHIFT),
(long long unsigned)info->size);
}
if (info->size == 0) {
info->size =((uint64_t) MAX_RAMDISK_SIZE);
info->sector_size = DEFAULT_SECTOR_SIZE;
}
info->info = 0;
/*Store variables locally*/
disksector_size = info->sector_size;
disksize = info->size;
diskinfo = info->info;
DPRINTF("Image sector_size: \n\t[%"PRIu64"]\n",
info->sector_size);
return 0;
}
/* Open the disk file and initialize ram state. */
int tdram_open (td_driver_t *driver, const char *name, td_flag_t flags)
{
char *p;
uint64_t size;
int i, fd, ret = 0, count = 0, o_flags;
struct tdram_state *prv = (struct tdram_state *)driver->data;
connections++;
if (connections > 1) {
driver->info.sector_size = disksector_size;
driver->info.size = disksize;
driver->info.info = diskinfo;
DPRINTF("Image already open, returning parameters:\n");
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(driver->info.size << SECTOR_SHIFT),
(long long unsigned)driver->info.size);
DPRINTF("Image sector_size: \n\t[%"PRIu64"]\n",
driver->info.sector_size);
prv->fd = -1;
goto done;
}
/* Open the file */
o_flags = O_DIRECT | O_LARGEFILE |
((flags == TD_OPEN_RDONLY) ? O_RDONLY : O_RDWR);
fd = open(name, o_flags);
if ((fd == -1) && (errno == EINVAL)) {
/* Maybe O_DIRECT isn't supported. */
o_flags &= ~O_DIRECT;
fd = open(name, o_flags);
if (fd != -1) DPRINTF("WARNING: Accessing image without"
"O_DIRECT! (%s)\n", name);
} else if (fd != -1) DPRINTF("open(%s) with O_DIRECT\n", name);
if (fd == -1) {
DPRINTF("Unable to open [%s]!\n",name);
ret = 0 - errno;
goto done;
}
prv->fd = fd;
ret = get_image_info(fd, &driver->info);
size = MAX_RAMDISK_SIZE;
if (driver->info.size > size) {
DPRINTF("Disk exceeds limit, must be less than [%d]MB",
(MAX_RAMDISK_SIZE<<SECTOR_SHIFT)>>20);
return -ENOMEM;
}
/*Read the image into memory*/
if (posix_memalign((void **)&img,
DEFAULT_SECTOR_SIZE,
driver->info.size << SECTOR_SHIFT)) {
DPRINTF("Mem malloc failed\n");
return -errno;
}
p = img;
DPRINTF("Reading %llu bytes.......",
(long long unsigned)driver->info.size << SECTOR_SHIFT);
for (i = 0; i < driver->info.size; i++) {
ret = read(prv->fd, p, driver->info.sector_size);
if (ret != driver->info.sector_size) {
DPRINTF("ret = %d, errno = %d\n", ret, errno);
ret = 0 - errno;
break;
} else {
count += ret;
p = img + count;
}
}
DPRINTF("[%d]\n",count);
if (count != driver->info.size << SECTOR_SHIFT) {
ret = -1;
} else {
ret = 0;
}
done:
return ret;
}
void tdram_queue_read(td_driver_t *driver, td_request_t treq)
{
struct tdram_state *prv = (struct tdram_state *)driver->data;
int size = treq.secs * driver->info.sector_size;
uint64_t offset = treq.sec * (uint64_t)driver->info.sector_size;
memcpy(treq.buf, img + offset, size);
td_complete_request(treq, 0);
}
void tdram_queue_write(td_driver_t *driver, td_request_t treq)
{
struct tdram_state *prv = (struct tdram_state *)driver->data;
int size = treq.secs * driver->info.sector_size;
uint64_t offset = treq.sec * (uint64_t)driver->info.sector_size;
/* We assume that write access is controlled
* at a higher level for multiple disks */
memcpy(img + offset, treq.buf, size);
td_complete_request(treq, 0);
}
int tdram_close(td_driver_t *driver)
{
struct tdram_state *prv = (struct tdram_state *)driver->data;
connections--;
return 0;
}
int tdram_get_parent_id(td_driver_t *driver, td_disk_id_t *id)
{
return TD_NO_PARENT;
}
int tdram_validate_parent(td_driver_t *driver,
td_driver_t *pdriver, td_flag_t flags)
{
return -EINVAL;
}
struct tap_disk tapdisk_ram = {
.disk_type = "tapdisk_ram",
.flags = 0,
.private_data_size = sizeof(struct tdram_state),
.td_open = tdram_open,
.td_close = tdram_close,
.td_queue_read = tdram_queue_read,
.td_queue_write = tdram_queue_write,
.td_get_parent_id = tdram_get_parent_id,
.td_validate_parent = tdram_validate_parent,
.td_debug = NULL,
};
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