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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.
*/
#ifndef NBDKIT_VIRTUAL_DISK_H
#define NBDKIT_VIRTUAL_DISK_H
#include <stdbool.h>
#include <sys/types.h>
#include "rounding.h"
#include "gpt.h"
#include "regions.h"
#define SECTOR_SIZE UINT64_C (512)
/* Maximum size of MBR disks. This is an approximation based on the
* known limit (2^32 sectors) and an estimate based on the amount of
* padding between partitions.
*/
#define MAX_MBR_DISK_SIZE (UINT32_MAX * SECTOR_SIZE - 5 * MAX_ALIGNMENT)
/* For GPT, the number of entries in the partition table array (PTA),
* and the number of LBAs which the PTA occupies. The latter will be
* 32 if the number of files is <= GPT_MIN_PARTITIONS, which is the
* normal case.
*/
#define GPT_PTA_SIZE ROUND_UP (the_files.len, GPT_MIN_PARTITIONS)
#define GPT_PTA_LBAs (GPT_PTA_SIZE * GPT_PT_ENTRY_SIZE / SECTOR_SIZE)
/* Maximum possible and default alignment between partitions. */
#define MAX_ALIGNMENT (2048 * SECTOR_SIZE)
#define DEFAULT_ALIGNMENT MAX_ALIGNMENT
/* Default MBR partition ID and GPT partition type GUID. */
#define DEFAULT_MBR_ID 0x83
#define DEFAULT_TYPE_GUID "0FC63DAF-8483-4772-8E79-3D69D8477DE4"
extern int partitioning_debug_regions;
extern unsigned long alignment;
extern uint8_t mbr_id;
extern char type_guid[16];
#define PARTTYPE_UNSET 0
#define PARTTYPE_MBR 1
#define PARTTYPE_GPT 2
extern int parttype;
/* A file supplied on the command line. */
struct file {
const char *filename; /* file= supplied on the command line */
int fd;
int64_t size;
char guid[16]; /* random GUID used for GPT */
unsigned long alignment; /* alignment of this partition */
uint8_t mbr_id; /* MBR ID of this partition */
char type_guid[16]; /* partition type GUID of this partition */
};
DEFINE_VECTOR_TYPE (files, struct file);
extern files the_files;
extern regions the_regions;
extern unsigned char *primary, *secondary, **ebr;
/* Main entry point called after files array has been populated. */
extern int create_virtual_disk_layout (void);
/* Parse a GPT GUID. Note that GPT GUIDs have peculiar
* characteristics which make them unlike general GUIDs.
*/
extern int parse_guid (const char *str, char *out)
__attribute__ ((__nonnull__ (1, 2)));
/* Internal function for creating a single MBR PTE. The GPT code
* calls this for creating the protective MBR.
*/
extern void create_mbr_partition_table_entry (const struct region *,
bool bootable, int partition_id,
unsigned char *)
__attribute__ ((__nonnull__ (1, 4)));
/* Create MBR or GPT layout. */
extern void create_mbr_layout (void);
extern void create_gpt_layout (void);
#endif /* NBDKIT_VIRTUAL_DISK_H */
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