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/* nbdkit
* Copyright Red Hat
*
* 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 Red Hat 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 RED HAT 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 RED HAT 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 <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include <nbdkit-plugin.h>
#include "random.h"
#include "regions.h"
#include "virtual-disk.h"
static int create_regions (struct virtual_disk *disk);
void
init_virtual_disk (struct virtual_disk *disk)
{
memset (disk, 0, sizeof *disk);
disk->fd = -1;
init_regions (&disk->regions);
}
int
create_virtual_disk (struct virtual_disk *disk)
{
size_t i;
/* Allocate the partition table structures. We can't fill them in
* until we have created the disk layout.
*/
disk->protective_mbr = calloc (1, SECTOR_SIZE);
disk->primary_header = calloc (1, SECTOR_SIZE);
disk->pt = calloc (1, 32*SECTOR_SIZE);
disk->secondary_header = calloc (1, SECTOR_SIZE);
if (disk->protective_mbr == NULL ||
disk->primary_header == NULL ||
disk->pt == NULL ||
disk->secondary_header == NULL) {
nbdkit_error ("calloc: %m");
return -1;
}
/* Create the filesystem. This fills in disk->filesystem_size and
* disk->id.
*/
if (create_filesystem (disk) == -1)
return -1;
/* Create a random GUID used as "Unique partition GUID". However
* this doesn't follow GUID conventions so in theory could make an
* invalid value.
*/
for (i = 0; i < 16; ++i)
disk->guid[i] = xrandom (&random_state) & 0xff;
/* Create the virtual disk regions. */
if (create_regions (disk) == -1)
return -1;
/* Initialize partition table structures. This depends on
* disk->regions so must be done last.
*/
if (create_partition_table (disk) == -1)
return -1;
return 0;
}
void
free_virtual_disk (struct virtual_disk *disk)
{
free_regions (&disk->regions);
free (disk->protective_mbr);
free (disk->primary_header);
free (disk->pt);
free (disk->secondary_header);
if (disk->fd >= 0)
close (disk->fd);
}
/* Lay out the final disk. */
static int
create_regions (struct virtual_disk *disk)
{
/* Protective MBR. */
if (append_region_len (&disk->regions, "Protective MBR",
SECTOR_SIZE, 0, 0,
region_data, (void *) disk->protective_mbr) == -1)
return -1;
/* GPT primary partition table header (LBA 1). */
if (append_region_len (&disk->regions, "GPT primary header",
SECTOR_SIZE, 0, 0,
region_data, (void *) disk->primary_header) == -1)
return -1;
/* GPT primary PT (LBA 2..33). */
if (append_region_len (&disk->regions, "GPT primary PT",
32*SECTOR_SIZE, 0, 0,
region_data, (void *) disk->pt) == -1)
return -1;
/* Partition containing the filesystem. Align it to 2048 sectors. */
if (append_region_len (&disk->regions, "Filesystem",
disk->filesystem_size, 2048*SECTOR_SIZE, 0,
region_file, 0 /* unused */) == -1)
return -1;
/* GPT secondary PT (LBA -33..-2). */
if (append_region_len (&disk->regions, "GPT secondary PT",
32*SECTOR_SIZE, SECTOR_SIZE, 0,
region_data, (void *) disk->pt) == -1)
return -1;
/* GPT secondary PT header (LBA -1). */
if (append_region_len (&disk->regions, "GPT secondary header",
SECTOR_SIZE, 0, 0,
region_data, (void *) disk->secondary_header) == -1)
return -1;
return 0;
}
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