system/qemu
system/qemu
1
0
Fork 0
mirror of https://gitlab.com/qemu-project/qemu synced 2024-11-05 20:35:44 +00:00
Code Issues Projects Releases Packages Wiki Activity
qemu/block/vdi.c
Peter Lieven 3ac216270a block: change default of .has_zero_init to 0 
.has_zero_init defaults to 1 for all formats and protocols.

this is a dangerous default since this means that all
new added drivers need to manually overwrite it to 0 if
they do not ensure that a device is zero initialized
after bdrv_create().

if a driver needs to explicitly set this value to
1 its easier to verify the correctness in the review process.

during review of the existing drivers it turned out
that ssh and gluster had a wrong default of 1.
both protocols support host_devices as backend
which are not by default zero initialized. this
wrong assumption will lead to possible corruption
if qemu-img convert is used to write to such a backend.

vpc and vmdk also defaulted to 1 altough they support
fixed respectively flat extends. this has to be addresses
in separate patches. both formats as well as the mentioned
ssh and gluster are turned to the default of 0 with this
patch for safety.

a similar problem with the wrong default existed for
iscsi most likely because the driver developer did
oversee the default value of 1.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-06-28 13:52:35 +02:00

803 lines
25 KiB
C
Raw Blame History

/*
* Block driver for the Virtual Disk Image (VDI) format
*
* Copyright (c) 2009, 2012 Stefan Weil
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) version 3 or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Reference:
* http://forums.virtualbox.org/viewtopic.php?t=8046
*
* This driver supports create / read / write operations on VDI images.
*
* Todo (see also TODO in code):
*
* Some features like snapshots are still missing.
*
* Deallocation of zero-filled blocks and shrinking images are missing, too
* (might be added to common block layer).
*
* Allocation of blocks could be optimized (less writes to block map and
* header).
*
* Read and write of adjacents blocks could be done in one operation
* (current code uses one operation per block (1 MiB).
*
* The code is not thread safe (missing locks for changes in header and
* block table, no problem with current QEMU).
*
* Hints:
*
* Blocks (VDI documentation) correspond to clusters (QEMU).
* QEMU's backing files could be implemented using VDI snapshot files (TODO).
* VDI snapshot files may also contain the complete machine state.
* Maybe this machine state can be converted to QEMU PC machine snapshot data.
*
* The driver keeps a block cache (little endian entries) in memory.
* For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM,
* so this seems to be reasonable.
*/
#include "qemu-common.h"
#include "block/block_int.h"
#include "qemu/module.h"
#include "migration/migration.h"
#if defined(CONFIG_UUID)
#include <uuid/uuid.h>
#else
/* TODO: move uuid emulation to some central place in QEMU. */
#include "sysemu/sysemu.h" /* UUID_FMT */
typedef unsigned char uuid_t[16];
#endif
/* Code configuration options. */
/* Enable debug messages. */
//~ #define CONFIG_VDI_DEBUG
/* Support write operations on VDI images. */
#define CONFIG_VDI_WRITE
/* Support non-standard block (cluster) size. This is untested.
* Maybe it will be needed for very large images.
*/
//~ #define CONFIG_VDI_BLOCK_SIZE
/* Support static (fixed, pre-allocated) images. */
#define CONFIG_VDI_STATIC_IMAGE
/* Command line option for static images. */
#define BLOCK_OPT_STATIC "static"
#define KiB 1024
#define MiB (KiB * KiB)
#define SECTOR_SIZE 512
#define DEFAULT_CLUSTER_SIZE (1 * MiB)
#if defined(CONFIG_VDI_DEBUG)
#define logout(fmt, ...) \
fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__)
#else
#define logout(fmt, ...) ((void)0)
#endif
/* Image signature. */
#define VDI_SIGNATURE 0xbeda107f
/* Image version. */
#define VDI_VERSION_1_1 0x00010001
/* Image type. */
#define VDI_TYPE_DYNAMIC 1
#define VDI_TYPE_STATIC 2
/* Innotek / SUN images use these strings in header.text:
* "<<< innotek VirtualBox Disk Image >>>\n"
* "<<< Sun xVM VirtualBox Disk Image >>>\n"
* "<<< Sun VirtualBox Disk Image >>>\n"
* The value does not matter, so QEMU created images use a different text.
*/
#define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n"
/* A never-allocated block; semantically arbitrary content. */
#define VDI_UNALLOCATED 0xffffffffU
/* A discarded (no longer allocated) block; semantically zero-filled. */
#define VDI_DISCARDED 0xfffffffeU
#define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED)
#if !defined(CONFIG_UUID)
static inline void uuid_generate(uuid_t out)
{
memset(out, 0, sizeof(uuid_t));
}
static inline int uuid_is_null(const uuid_t uu)
{
uuid_t null_uuid = { 0 };
return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0;
}
static inline void uuid_unparse(const uuid_t uu, char *out)
{
snprintf(out, 37, UUID_FMT,
uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
}
#endif
typedef struct {
char text[0x40];
uint32_t signature;
uint32_t version;
uint32_t header_size;
uint32_t image_type;
uint32_t image_flags;
char description[256];
uint32_t offset_bmap;
uint32_t offset_data;
uint32_t cylinders; /* disk geometry, unused here */
uint32_t heads; /* disk geometry, unused here */
uint32_t sectors; /* disk geometry, unused here */
uint32_t sector_size;
uint32_t unused1;
uint64_t disk_size;
uint32_t block_size;
uint32_t block_extra; /* unused here */
uint32_t blocks_in_image;
uint32_t blocks_allocated;
uuid_t uuid_image;
uuid_t uuid_last_snap;
uuid_t uuid_link;
uuid_t uuid_parent;
uint64_t unused2[7];
} VdiHeader;
typedef struct {
/* The block map entries are little endian (even in memory). */
uint32_t *bmap;
/* Size of block (bytes). */
uint32_t block_size;
/* Size of block (sectors). */
uint32_t block_sectors;
/* First sector of block map. */
uint32_t bmap_sector;
/* VDI header (converted to host endianness). */
VdiHeader header;
Error *migration_blocker;
} BDRVVdiState;
/* Change UUID from little endian (IPRT = VirtualBox format) to big endian
* format (network byte order, standard, see RFC 4122) and vice versa.
*/
static void uuid_convert(uuid_t uuid)
{
bswap32s((uint32_t *)&uuid[0]);
bswap16s((uint16_t *)&uuid[4]);
bswap16s((uint16_t *)&uuid[6]);
}
static void vdi_header_to_cpu(VdiHeader *header)
{
le32_to_cpus(&header->signature);
le32_to_cpus(&header->version);
le32_to_cpus(&header->header_size);
le32_to_cpus(&header->image_type);
le32_to_cpus(&header->image_flags);
le32_to_cpus(&header->offset_bmap);
le32_to_cpus(&header->offset_data);
le32_to_cpus(&header->cylinders);
le32_to_cpus(&header->heads);
le32_to_cpus(&header->sectors);
le32_to_cpus(&header->sector_size);
le64_to_cpus(&header->disk_size);
le32_to_cpus(&header->block_size);
le32_to_cpus(&header->block_extra);
le32_to_cpus(&header->blocks_in_image);
le32_to_cpus(&header->blocks_allocated);
uuid_convert(header->uuid_image);
uuid_convert(header->uuid_last_snap);
uuid_convert(header->uuid_link);
uuid_convert(header->uuid_parent);
}
static void vdi_header_to_le(VdiHeader *header)
{
cpu_to_le32s(&header->signature);
cpu_to_le32s(&header->version);
cpu_to_le32s(&header->header_size);
cpu_to_le32s(&header->image_type);
cpu_to_le32s(&header->image_flags);
cpu_to_le32s(&header->offset_bmap);
cpu_to_le32s(&header->offset_data);
cpu_to_le32s(&header->cylinders);
cpu_to_le32s(&header->heads);
cpu_to_le32s(&header->sectors);
cpu_to_le32s(&header->sector_size);
cpu_to_le64s(&header->disk_size);
cpu_to_le32s(&header->block_size);
cpu_to_le32s(&header->block_extra);
cpu_to_le32s(&header->blocks_in_image);
cpu_to_le32s(&header->blocks_allocated);
cpu_to_le32s(&header->blocks_allocated);
uuid_convert(header->uuid_image);
uuid_convert(header->uuid_last_snap);
uuid_convert(header->uuid_link);
uuid_convert(header->uuid_parent);
}
#if defined(CONFIG_VDI_DEBUG)
static void vdi_header_print(VdiHeader *header)
{
char uuid[37];
logout("text %s", header->text);
logout("signature 0x%08x\n", header->signature);
logout("header size 0x%04x\n", header->header_size);
logout("image type 0x%04x\n", header->image_type);
logout("image flags 0x%04x\n", header->image_flags);
logout("description %s\n", header->description);
logout("offset bmap 0x%04x\n", header->offset_bmap);
logout("offset data 0x%04x\n", header->offset_data);
logout("cylinders 0x%04x\n", header->cylinders);
logout("heads 0x%04x\n", header->heads);
logout("sectors 0x%04x\n", header->sectors);
logout("sector size 0x%04x\n", header->sector_size);
logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n",
header->disk_size, header->disk_size / MiB);
logout("block size 0x%04x\n", header->block_size);
logout("block extra 0x%04x\n", header->block_extra);
logout("blocks tot. 0x%04x\n", header->blocks_in_image);
logout("blocks all. 0x%04x\n", header->blocks_allocated);
uuid_unparse(header->uuid_image, uuid);
logout("uuid image %s\n", uuid);
uuid_unparse(header->uuid_last_snap, uuid);
logout("uuid snap %s\n", uuid);
uuid_unparse(header->uuid_link, uuid);
logout("uuid link %s\n", uuid);
uuid_unparse(header->uuid_parent, uuid);
logout("uuid parent %s\n", uuid);
}
#endif
static int vdi_check(BlockDriverState *bs, BdrvCheckResult *res,
BdrvCheckMode fix)
{
/* TODO: additional checks possible. */
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
uint32_t blocks_allocated = 0;
uint32_t block;
uint32_t *bmap;
logout("\n");
if (fix) {
return -ENOTSUP;
}
bmap = g_malloc(s->header.blocks_in_image * sizeof(uint32_t));
memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
/* Check block map and value of blocks_allocated. */
for (block = 0; block < s->header.blocks_in_image; block++) {
uint32_t bmap_entry = le32_to_cpu(s->bmap[block]);
if (VDI_IS_ALLOCATED(bmap_entry)) {
if (bmap_entry < s->header.blocks_in_image) {
blocks_allocated++;
if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) {
bmap[bmap_entry] = bmap_entry;
} else {
fprintf(stderr, "ERROR: block index %" PRIu32
" also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry);
res->corruptions++;
}
} else {
fprintf(stderr, "ERROR: block index %" PRIu32
" too large, is %" PRIu32 "\n", block, bmap_entry);
res->corruptions++;
}
}
}
if (blocks_allocated != s->header.blocks_allocated) {
fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32
", should be %" PRIu32 "\n",
blocks_allocated, s->header.blocks_allocated);
res->corruptions++;
}
g_free(bmap);
return 0;
}
static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
/* TODO: vdi_get_info would be needed for machine snapshots.
vm_state_offset is still missing. */
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
logout("\n");
bdi->cluster_size = s->block_size;
bdi->vm_state_offset = 0;
return 0;
}
static int vdi_make_empty(BlockDriverState *bs)
{
/* TODO: missing code. */
logout("\n");
/* The return value for missing code must be 0, see block.c. */
return 0;
}
static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
{
const VdiHeader *header = (const VdiHeader *)buf;
int result = 0;
logout("\n");
if (buf_size < sizeof(*header)) {
/* Header too small, no VDI. */
} else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
result = 100;
}
if (result == 0) {
logout("no vdi image\n");
} else {
logout("%s", header->text);
}
return result;
}
static int vdi_open(BlockDriverState *bs, QDict *options, int flags)
{
BDRVVdiState *s = bs->opaque;
VdiHeader header;
size_t bmap_size;
int ret;
logout("\n");
ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1);
if (ret < 0) {
goto fail;
}
vdi_header_to_cpu(&header);
#if defined(CONFIG_VDI_DEBUG)
vdi_header_print(&header);
#endif
if (header.disk_size % SECTOR_SIZE != 0) {
/* 'VBoxManage convertfromraw' can create images with odd disk sizes.
We accept them but round the disk size to the next multiple of
SECTOR_SIZE. */
logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
header.disk_size += SECTOR_SIZE - 1;
header.disk_size &= ~(SECTOR_SIZE - 1);
}
if (header.signature != VDI_SIGNATURE) {
logout("bad vdi signature %08x\n", header.signature);
ret = -EMEDIUMTYPE;
goto fail;
} else if (header.version != VDI_VERSION_1_1) {
logout("unsupported version %u.%u\n",
header.version >> 16, header.version & 0xffff);
ret = -ENOTSUP;
goto fail;
} else if (header.offset_bmap % SECTOR_SIZE != 0) {
/* We only support block maps which start on a sector boundary. */
logout("unsupported block map offset 0x%x B\n", header.offset_bmap);
ret = -ENOTSUP;
goto fail;
} else if (header.offset_data % SECTOR_SIZE != 0) {
/* We only support data blocks which start on a sector boundary. */
logout("unsupported data offset 0x%x B\n", header.offset_data);
ret = -ENOTSUP;
goto fail;
} else if (header.sector_size != SECTOR_SIZE) {
logout("unsupported sector size %u B\n", header.sector_size);
ret = -ENOTSUP;
goto fail;
} else if (header.block_size != 1 * MiB) {
logout("unsupported block size %u B\n", header.block_size);
ret = -ENOTSUP;
goto fail;
} else if (header.disk_size >
(uint64_t)header.blocks_in_image * header.block_size) {
logout("unsupported disk size %" PRIu64 " B\n", header.disk_size);
ret = -ENOTSUP;
goto fail;
} else if (!uuid_is_null(header.uuid_link)) {
logout("link uuid != 0, unsupported\n");
ret = -ENOTSUP;
goto fail;
} else if (!uuid_is_null(header.uuid_parent)) {
logout("parent uuid != 0, unsupported\n");
ret = -ENOTSUP;
goto fail;
}
bs->total_sectors = header.disk_size / SECTOR_SIZE;
s->block_size = header.block_size;
s->block_sectors = header.block_size / SECTOR_SIZE;
s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
s->header = header;
bmap_size = header.blocks_in_image * sizeof(uint32_t);
bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
s->bmap = g_malloc(bmap_size * SECTOR_SIZE);
ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size);
if (ret < 0) {
goto fail_free_bmap;
}
/* Disable migration when vdi images are used */
error_set(&s->migration_blocker,
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
"vdi", bs->device_name, "live migration");
migrate_add_blocker(s->migration_blocker);
return 0;
fail_free_bmap:
g_free(s->bmap);
fail:
return ret;
}
static int vdi_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
return 0;
}
static int coroutine_fn vdi_co_is_allocated(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum)
{
/* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
size_t bmap_index = sector_num / s->block_sectors;
size_t sector_in_block = sector_num % s->block_sectors;
int n_sectors = s->block_sectors - sector_in_block;
uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
if (n_sectors > nb_sectors) {
n_sectors = nb_sectors;
}
*pnum = n_sectors;
return VDI_IS_ALLOCATED(bmap_entry);
}
static int vdi_co_read(BlockDriverState *bs,
int64_t sector_num, uint8_t *buf, int nb_sectors)
{
BDRVVdiState *s = bs->opaque;
uint32_t bmap_entry;
uint32_t block_index;
uint32_t sector_in_block;
uint32_t n_sectors;
int ret = 0;
logout("\n");
while (ret >= 0 && nb_sectors > 0) {
block_index = sector_num / s->block_sectors;
sector_in_block = sector_num % s->block_sectors;
n_sectors = s->block_sectors - sector_in_block;
if (n_sectors > nb_sectors) {
n_sectors = nb_sectors;
}
logout("will read %u sectors starting at sector %" PRIu64 "\n",
n_sectors, sector_num);
/* prepare next AIO request */
bmap_entry = le32_to_cpu(s->bmap[block_index]);
if (!VDI_IS_ALLOCATED(bmap_entry)) {
/* Block not allocated, return zeros, no need to wait. */
memset(buf, 0, n_sectors * SECTOR_SIZE);
ret = 0;
} else {
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
(uint64_t)bmap_entry * s->block_sectors +
sector_in_block;
ret = bdrv_read(bs->file, offset, buf, n_sectors);
}
logout("%u sectors read\n", n_sectors);
nb_sectors -= n_sectors;
sector_num += n_sectors;
buf += n_sectors * SECTOR_SIZE;
}
return ret;
}
static int vdi_co_write(BlockDriverState *bs,
int64_t sector_num, const uint8_t *buf, int nb_sectors)
{
BDRVVdiState *s = bs->opaque;
uint32_t bmap_entry;
uint32_t block_index;
uint32_t sector_in_block;
uint32_t n_sectors;
uint32_t bmap_first = VDI_UNALLOCATED;
uint32_t bmap_last = VDI_UNALLOCATED;
uint8_t *block = NULL;
int ret = 0;
logout("\n");
while (ret >= 0 && nb_sectors > 0) {
block_index = sector_num / s->block_sectors;
sector_in_block = sector_num % s->block_sectors;
n_sectors = s->block_sectors - sector_in_block;
if (n_sectors > nb_sectors) {
n_sectors = nb_sectors;
}
logout("will write %u sectors starting at sector %" PRIu64 "\n",
n_sectors, sector_num);
/* prepare next AIO request */
bmap_entry = le32_to_cpu(s->bmap[block_index]);
if (!VDI_IS_ALLOCATED(bmap_entry)) {
/* Allocate new block and write to it. */
uint64_t offset;
bmap_entry = s->header.blocks_allocated;
s->bmap[block_index] = cpu_to_le32(bmap_entry);
s->header.blocks_allocated++;
offset = s->header.offset_data / SECTOR_SIZE +
(uint64_t)bmap_entry * s->block_sectors;
if (block == NULL) {
block = g_malloc(s->block_size);
bmap_first = block_index;
}
bmap_last = block_index;
/* Copy data to be written to new block and zero unused parts. */
memset(block, 0, sector_in_block * SECTOR_SIZE);
memcpy(block + sector_in_block * SECTOR_SIZE,
buf, n_sectors * SECTOR_SIZE);
memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0,
(s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE);
ret = bdrv_write(bs->file, offset, block, s->block_sectors);
} else {
uint64_t offset = s->header.offset_data / SECTOR_SIZE +
(uint64_t)bmap_entry * s->block_sectors +
sector_in_block;
ret = bdrv_write(bs->file, offset, buf, n_sectors);
}
nb_sectors -= n_sectors;
sector_num += n_sectors;
buf += n_sectors * SECTOR_SIZE;
logout("%u sectors written\n", n_sectors);
}
logout("finished data write\n");
if (ret < 0) {
return ret;
}
if (block) {
/* One or more new blocks were allocated. */
VdiHeader *header = (VdiHeader *) block;
uint8_t *base;
uint64_t offset;
logout("now writing modified header\n");
assert(VDI_IS_ALLOCATED(bmap_first));
*header = s->header;
vdi_header_to_le(header);
ret = bdrv_write(bs->file, 0, block, 1);
g_free(block);
block = NULL;
if (ret < 0) {
return ret;
}
logout("now writing modified block map entry %u...%u\n",
bmap_first, bmap_last);
/* Write modified sectors from block map. */
bmap_first /= (SECTOR_SIZE / sizeof(uint32_t));
bmap_last /= (SECTOR_SIZE / sizeof(uint32_t));
n_sectors = bmap_last - bmap_first + 1;
offset = s->bmap_sector + bmap_first;
base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
logout("will write %u block map sectors starting from entry %u\n",
n_sectors, bmap_first);
ret = bdrv_write(bs->file, offset, base, n_sectors);
}
return ret;
}
static int vdi_create(const char *filename, QEMUOptionParameter *options)
{
int fd;
int result = 0;
uint64_t bytes = 0;
uint32_t blocks;
size_t block_size = DEFAULT_CLUSTER_SIZE;
uint32_t image_type = VDI_TYPE_DYNAMIC;
VdiHeader header;
size_t i;
size_t bmap_size;
logout("\n");
/* Read out options. */
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
bytes = options->value.n;
#if defined(CONFIG_VDI_BLOCK_SIZE)
} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
if (options->value.n) {
/* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */
block_size = options->value.n;
}
#endif
#if defined(CONFIG_VDI_STATIC_IMAGE)
} else if (!strcmp(options->name, BLOCK_OPT_STATIC)) {
if (options->value.n) {
image_type = VDI_TYPE_STATIC;
}
#endif
}
options++;
}
fd = qemu_open(filename,
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
0644);
if (fd < 0) {
return -errno;
}
/* We need enough blocks to store the given disk size,
so always round up. */
blocks = (bytes + block_size - 1) / block_size;
bmap_size = blocks * sizeof(uint32_t);
bmap_size = ((bmap_size + SECTOR_SIZE - 1) & ~(SECTOR_SIZE -1));
memset(&header, 0, sizeof(header));
pstrcpy(header.text, sizeof(header.text), VDI_TEXT);
header.signature = VDI_SIGNATURE;
header.version = VDI_VERSION_1_1;
header.header_size = 0x180;
header.image_type = image_type;
header.offset_bmap = 0x200;
header.offset_data = 0x200 + bmap_size;
header.sector_size = SECTOR_SIZE;
header.disk_size = bytes;
header.block_size = block_size;
header.blocks_in_image = blocks;
if (image_type == VDI_TYPE_STATIC) {
header.blocks_allocated = blocks;
}
uuid_generate(header.uuid_image);
uuid_generate(header.uuid_last_snap);
/* There is no need to set header.uuid_link or header.uuid_parent here. */
#if defined(CONFIG_VDI_DEBUG)
vdi_header_print(&header);
#endif
vdi_header_to_le(&header);
if (write(fd, &header, sizeof(header)) < 0) {
result = -errno;
}
if (bmap_size > 0) {
uint32_t *bmap = g_malloc0(bmap_size);
for (i = 0; i < blocks; i++) {
if (image_type == VDI_TYPE_STATIC) {
bmap[i] = i;
} else {
bmap[i] = VDI_UNALLOCATED;
}
}
if (write(fd, bmap, bmap_size) < 0) {
result = -errno;
}
g_free(bmap);
}
if (image_type == VDI_TYPE_STATIC) {
if (ftruncate(fd, sizeof(header) + bmap_size + blocks * block_size)) {
result = -errno;
}
}
if (close(fd) < 0) {
result = -errno;
}
return result;
}
static void vdi_close(BlockDriverState *bs)
{
BDRVVdiState *s = bs->opaque;
g_free(s->bmap);
migrate_del_blocker(s->migration_blocker);
error_free(s->migration_blocker);
}
static QEMUOptionParameter vdi_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
.help = "Virtual disk size"
},
#if defined(CONFIG_VDI_BLOCK_SIZE)
{
.name = BLOCK_OPT_CLUSTER_SIZE,
.type = OPT_SIZE,
.help = "VDI cluster (block) size",
.value = { .n = DEFAULT_CLUSTER_SIZE },
},
#endif
#if defined(CONFIG_VDI_STATIC_IMAGE)
{
.name = BLOCK_OPT_STATIC,
.type = OPT_FLAG,
.help = "VDI static (pre-allocated) image"
},
#endif
/* TODO: An additional option to set UUID values might be useful. */
{ NULL }
};
static BlockDriver bdrv_vdi = {
.format_name = "vdi",
.instance_size = sizeof(BDRVVdiState),
.bdrv_probe = vdi_probe,
.bdrv_open = vdi_open,
.bdrv_close = vdi_close,
.bdrv_reopen_prepare = vdi_reopen_prepare,
.bdrv_create = vdi_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_is_allocated = vdi_co_is_allocated,
.bdrv_make_empty = vdi_make_empty,
.bdrv_read = vdi_co_read,
#if defined(CONFIG_VDI_WRITE)
.bdrv_write = vdi_co_write,
#endif
.bdrv_get_info = vdi_get_info,
.create_options = vdi_create_options,
.bdrv_check = vdi_check,
};
static void bdrv_vdi_init(void)
{
logout("\n");
bdrv_register(&bdrv_vdi);
}
block_init(bdrv_vdi_init);
Reference in a new issue View git blame Copy permalink