summaryrefslogtreecommitdiffstats
path: root/qemu/block/vdi.c
diff options
context:
space:
mode:
Diffstat (limited to 'qemu/block/vdi.c')
-rw-r--r--qemu/block/vdi.c923
1 files changed, 0 insertions, 923 deletions
diff --git a/qemu/block/vdi.c b/qemu/block/vdi.c
deleted file mode 100644
index 75d4819ed..000000000
--- a/qemu/block/vdi.c
+++ /dev/null
@@ -1,923 +0,0 @@
-/*
- * 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 adjacent 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/osdep.h"
-#include "qapi/error.h"
-#include "block/block_int.h"
-#include "sysemu/block-backend.h"
-#include "qemu/module.h"
-#include "migration/migration.h"
-#include "qemu/coroutine.h"
-#include "qemu/cutils.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)
-
-/* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since
- * the bmap is read and written in a single operation, its size needs to be
- * limited to INT_MAX; furthermore, when opening an image, the bmap size is
- * rounded up to be aligned on BDRV_SECTOR_SIZE.
- * Therefore this should satisfy the following:
- * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1
- * (INT_MAX + 1 is the first value not representable as an int)
- * This guarantees that any value below or equal to the constant will, when
- * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary,
- * still be below or equal to INT_MAX. */
-#define VDI_BLOCKS_IN_IMAGE_MAX \
- ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t)))
-#define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \
- (uint64_t)DEFAULT_CLUSTER_SIZE)
-
-#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;
-}
-
-# if defined(CONFIG_VDI_DEBUG)
-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
-#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];
-} QEMU_PACKED 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;
-
- CoMutex write_lock;
-
- 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);
- 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_try_new(uint32_t, s->header.blocks_in_image);
- if (s->header.blocks_in_image && bmap == NULL) {
- res->check_errors++;
- return -ENOMEM;
- }
-
- 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;
- bdi->unallocated_blocks_are_zero = true;
- 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 ret = 0;
-
- logout("\n");
-
- if (buf_size < sizeof(*header)) {
- /* Header too small, no VDI. */
- } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
- ret = 100;
- }
-
- if (ret == 0) {
- logout("no vdi image\n");
- } else {
- logout("%s", header->text);
- }
-
- return ret;
-}
-
-static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
- Error **errp)
-{
- BDRVVdiState *s = bs->opaque;
- VdiHeader header;
- size_t bmap_size;
- int ret;
-
- logout("\n");
-
- ret = bdrv_read(bs->file->bs, 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 > VDI_DISK_SIZE_MAX) {
- error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
- ", max supported is 0x%" PRIx64 ")",
- header.disk_size, VDI_DISK_SIZE_MAX);
- ret = -ENOTSUP;
- goto fail;
- }
-
- 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 = ROUND_UP(header.disk_size, SECTOR_SIZE);
- }
-
- if (header.signature != VDI_SIGNATURE) {
- error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32
- ")", header.signature);
- ret = -EINVAL;
- goto fail;
- } else if (header.version != VDI_VERSION_1_1) {
- error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32
- ")", 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. */
- error_setg(errp, "unsupported VDI image (unaligned block map offset "
- "0x%" PRIx32 ")", 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. */
- error_setg(errp, "unsupported VDI image (unaligned data offset 0x%"
- PRIx32 ")", header.offset_data);
- ret = -ENOTSUP;
- goto fail;
- } else if (header.sector_size != SECTOR_SIZE) {
- error_setg(errp, "unsupported VDI image (sector size %" PRIu32
- " is not %u)", header.sector_size, SECTOR_SIZE);
- ret = -ENOTSUP;
- goto fail;
- } else if (header.block_size != DEFAULT_CLUSTER_SIZE) {
- error_setg(errp, "unsupported VDI image (block size %" PRIu32
- " is not %u)", header.block_size, DEFAULT_CLUSTER_SIZE);
- ret = -ENOTSUP;
- goto fail;
- } else if (header.disk_size >
- (uint64_t)header.blocks_in_image * header.block_size) {
- error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", "
- "image bitmap has room for %" PRIu64 ")",
- header.disk_size,
- (uint64_t)header.blocks_in_image * header.block_size);
- ret = -ENOTSUP;
- goto fail;
- } else if (!uuid_is_null(header.uuid_link)) {
- error_setg(errp, "unsupported VDI image (non-NULL link UUID)");
- ret = -ENOTSUP;
- goto fail;
- } else if (!uuid_is_null(header.uuid_parent)) {
- error_setg(errp, "unsupported VDI image (non-NULL parent UUID)");
- ret = -ENOTSUP;
- goto fail;
- } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) {
- error_setg(errp, "unsupported VDI image "
- "(too many blocks %u, max is %u)",
- header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX);
- 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 = DIV_ROUND_UP(bmap_size, SECTOR_SIZE);
- s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE);
- if (s->bmap == NULL) {
- ret = -ENOMEM;
- goto fail;
- }
-
- ret = bdrv_read(bs->file->bs, s->bmap_sector, (uint8_t *)s->bmap,
- bmap_size);
- if (ret < 0) {
- goto fail_free_bmap;
- }
-
- /* Disable migration when vdi images are used */
- error_setg(&s->migration_blocker, "The vdi format used by node '%s' "
- "does not support live migration",
- bdrv_get_device_or_node_name(bs));
- migrate_add_blocker(s->migration_blocker);
-
- qemu_co_mutex_init(&s->write_lock);
-
- return 0;
-
- fail_free_bmap:
- qemu_vfree(s->bmap);
-
- fail:
- return ret;
-}
-
-static int vdi_reopen_prepare(BDRVReopenState *state,
- BlockReopenQueue *queue, Error **errp)
-{
- return 0;
-}
-
-static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
-{
- /* 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]);
- uint64_t offset;
- int result;
-
- logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
- if (n_sectors > nb_sectors) {
- n_sectors = nb_sectors;
- }
- *pnum = n_sectors;
- result = VDI_IS_ALLOCATED(bmap_entry);
- if (!result) {
- return 0;
- }
-
- offset = s->header.offset_data +
- (uint64_t)bmap_entry * s->block_size +
- sector_in_block * SECTOR_SIZE;
- *file = bs->file->bs;
- return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
-}
-
-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->bs, 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);
-
- /* Note that this coroutine does not yield anywhere from reading the
- * bmap entry until here, so in regards to all the coroutines trying
- * to write to this cluster, the one doing the allocation will
- * always be the first to try to acquire the lock.
- * Therefore, it is also the first that will actually be able to
- * acquire the lock and thus the padded cluster is written before
- * the other coroutines can write to the affected area. */
- qemu_co_mutex_lock(&s->write_lock);
- ret = bdrv_write(bs->file->bs, offset, block, s->block_sectors);
- qemu_co_mutex_unlock(&s->write_lock);
- } else {
- uint64_t offset = s->header.offset_data / SECTOR_SIZE +
- (uint64_t)bmap_entry * s->block_sectors +
- sector_in_block;
- qemu_co_mutex_lock(&s->write_lock);
- /* This lock is only used to make sure the following write operation
- * is executed after the write issued by the coroutine allocating
- * this cluster, therefore we do not need to keep it locked.
- * As stated above, the allocating coroutine will always try to lock
- * the mutex before all the other concurrent accesses to that
- * cluster, therefore at this point we can be absolutely certain
- * that that write operation has returned (there may be other writes
- * in flight, but they do not concern this very operation). */
- qemu_co_mutex_unlock(&s->write_lock);
- ret = bdrv_write(bs->file->bs, 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->bs, 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->bs, offset, base, n_sectors);
- }
-
- return ret;
-}
-
-static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
-{
- int ret = 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;
- int64_t offset = 0;
- Error *local_err = NULL;
- BlockBackend *blk = NULL;
- uint32_t *bmap = NULL;
-
- logout("\n");
-
- /* Read out options. */
- bytes = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
- BDRV_SECTOR_SIZE);
-#if defined(CONFIG_VDI_BLOCK_SIZE)
- /* TODO: Additional checks (SECTOR_SIZE * 2^n, ...). */
- block_size = qemu_opt_get_size_del(opts,
- BLOCK_OPT_CLUSTER_SIZE,
- DEFAULT_CLUSTER_SIZE);
-#endif
-#if defined(CONFIG_VDI_STATIC_IMAGE)
- if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) {
- image_type = VDI_TYPE_STATIC;
- }
-#endif
-
- if (bytes > VDI_DISK_SIZE_MAX) {
- ret = -ENOTSUP;
- error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
- ", max supported is 0x%" PRIx64 ")",
- bytes, VDI_DISK_SIZE_MAX);
- goto exit;
- }
-
- ret = bdrv_create_file(filename, opts, &local_err);
- if (ret < 0) {
- error_propagate(errp, local_err);
- goto exit;
- }
-
- blk = blk_new_open(filename, NULL, NULL,
- BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
- if (blk == NULL) {
- error_propagate(errp, local_err);
- ret = -EIO;
- goto exit;
- }
-
- blk_set_allow_write_beyond_eof(blk, true);
-
- /* We need enough blocks to store the given disk size,
- so always round up. */
- blocks = DIV_ROUND_UP(bytes, block_size);
-
- bmap_size = blocks * sizeof(uint32_t);
- bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE);
-
- 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);
- ret = blk_pwrite(blk, offset, &header, sizeof(header));
- if (ret < 0) {
- error_setg(errp, "Error writing header to %s", filename);
- goto exit;
- }
- offset += sizeof(header);
-
- if (bmap_size > 0) {
- bmap = g_try_malloc0(bmap_size);
- if (bmap == NULL) {
- ret = -ENOMEM;
- error_setg(errp, "Could not allocate bmap");
- goto exit;
- }
- for (i = 0; i < blocks; i++) {
- if (image_type == VDI_TYPE_STATIC) {
- bmap[i] = i;
- } else {
- bmap[i] = VDI_UNALLOCATED;
- }
- }
- ret = blk_pwrite(blk, offset, bmap, bmap_size);
- if (ret < 0) {
- error_setg(errp, "Error writing bmap to %s", filename);
- goto exit;
- }
- offset += bmap_size;
- }
-
- if (image_type == VDI_TYPE_STATIC) {
- ret = blk_truncate(blk, offset + blocks * block_size);
- if (ret < 0) {
- error_setg(errp, "Failed to statically allocate %s", filename);
- goto exit;
- }
- }
-
-exit:
- blk_unref(blk);
- g_free(bmap);
- return ret;
-}
-
-static void vdi_close(BlockDriverState *bs)
-{
- BDRVVdiState *s = bs->opaque;
-
- qemu_vfree(s->bmap);
-
- migrate_del_blocker(s->migration_blocker);
- error_free(s->migration_blocker);
-}
-
-static QemuOptsList vdi_create_opts = {
- .name = "vdi-create-opts",
- .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head),
- .desc = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = QEMU_OPT_SIZE,
- .help = "Virtual disk size"
- },
-#if defined(CONFIG_VDI_BLOCK_SIZE)
- {
- .name = BLOCK_OPT_CLUSTER_SIZE,
- .type = QEMU_OPT_SIZE,
- .help = "VDI cluster (block) size",
- .def_value_str = stringify(DEFAULT_CLUSTER_SIZE)
- },
-#endif
-#if defined(CONFIG_VDI_STATIC_IMAGE)
- {
- .name = BLOCK_OPT_STATIC,
- .type = QEMU_OPT_BOOL,
- .help = "VDI static (pre-allocated) image",
- .def_value_str = "off"
- },
-#endif
- /* TODO: An additional option to set UUID values might be useful. */
- { /* end of list */ }
- }
-};
-
-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_get_block_status = vdi_co_get_block_status,
- .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_opts = &vdi_create_opts,
- .bdrv_check = vdi_check,
-};
-
-static void bdrv_vdi_init(void)
-{
- logout("\n");
- bdrv_register(&bdrv_vdi);
-}
-
-block_init(bdrv_vdi_init);