* THE SOFTWARE.
*/
#include "qemu-common.h"
-#include "block_int.h"
-#include "module.h"
-#include "migration.h"
+#include "block/block_int.h"
+#include "qemu/module.h"
+#include "migration/migration.h"
+#if defined(CONFIG_UUID)
+#include <uuid/uuid.h>
+#endif
/**************************************************************/
// Seconds since Jan 1, 2000 0:00:00 (UTC)
#define VHD_TIMESTAMP_BASE 946684800
+#define VHD_MAX_SECTORS (65535LL * 255 * 255)
+
// always big-endian
-struct vhd_footer {
+typedef struct vhd_footer {
char creator[8]; // "conectix"
uint32_t features;
uint32_t version;
uint8_t uuid[16];
uint8_t in_saved_state;
-};
+} QEMU_PACKED VHDFooter;
-struct vhd_dyndisk_header {
+typedef struct vhd_dyndisk_header {
char magic[8]; // "cxsparse"
// Offset of next header structure, 0xFFFFFFFF if none
uint32_t reserved;
uint64_t data_offset;
} parent_locator[8];
-};
+} QEMU_PACKED VHDDynDiskHeader;
typedef struct BDRVVPCState {
CoMutex lock;
return 0;
}
-static int vpc_open(BlockDriverState *bs, int flags)
+static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
+ Error **errp)
{
BDRVVPCState *s = bs->opaque;
int i;
- struct vhd_footer* footer;
- struct vhd_dyndisk_header* dyndisk_header;
+ VHDFooter *footer;
+ VHDDynDiskHeader *dyndisk_header;
uint8_t buf[HEADER_SIZE];
uint32_t checksum;
- int err = -1;
+ uint64_t computed_size;
int disk_type = VHD_DYNAMIC;
+ int ret;
- if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
+ ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE);
+ if (ret < 0) {
goto fail;
+ }
- footer = (struct vhd_footer*) s->footer_buf;
+ footer = (VHDFooter *) s->footer_buf;
if (strncmp(footer->creator, "conectix", 8)) {
int64_t offset = bdrv_getlength(bs->file);
- if (offset < HEADER_SIZE) {
+ if (offset < 0) {
+ ret = offset;
+ goto fail;
+ } else if (offset < HEADER_SIZE) {
+ ret = -EINVAL;
goto fail;
}
+
/* If a fixed disk, the footer is found only at the end of the file */
- if (bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE)
- != HEADER_SIZE) {
+ ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf,
+ HEADER_SIZE);
+ if (ret < 0) {
goto fail;
}
if (strncmp(footer->creator, "conectix", 8)) {
+ error_setg(errp, "invalid VPC image");
+ ret = -EINVAL;
goto fail;
}
disk_type = VHD_FIXED;
bs->total_sectors = (int64_t)
be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
- if (bs->total_sectors >= 65535 * 16 * 255) {
- err = -EFBIG;
+ /* images created with disk2vhd report a far higher virtual size
+ * than expected with the cyls * heads * sectors_per_cyl formula.
+ * use the footer->size instead if the image was created with
+ * disk2vhd.
+ */
+ if (!strncmp(footer->creator_app, "d2v", 4)) {
+ bs->total_sectors = be64_to_cpu(footer->size) / BDRV_SECTOR_SIZE;
+ }
+
+ /* Allow a maximum disk size of approximately 2 TB */
+ if (bs->total_sectors >= VHD_MAX_SECTORS) {
+ ret = -EFBIG;
goto fail;
}
if (disk_type == VHD_DYNAMIC) {
- if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
- HEADER_SIZE) != HEADER_SIZE) {
+ ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
+ HEADER_SIZE);
+ if (ret < 0) {
goto fail;
}
- dyndisk_header = (struct vhd_dyndisk_header *) buf;
+ dyndisk_header = (VHDDynDiskHeader *) buf;
if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
+ ret = -EINVAL;
goto fail;
}
s->block_size = be32_to_cpu(dyndisk_header->block_size);
+ if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) {
+ error_setg(errp, "Invalid block size %" PRIu32, s->block_size);
+ ret = -EINVAL;
+ goto fail;
+ }
s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
- s->pagetable = g_malloc(s->max_table_entries * 4);
+
+ if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) {
+ ret = -EINVAL;
+ goto fail;
+ }
+ if (s->max_table_entries > (VHD_MAX_SECTORS * 512) / s->block_size) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ computed_size = (uint64_t) s->max_table_entries * s->block_size;
+ if (computed_size < bs->total_sectors * 512) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ s->pagetable = qemu_blockalign(bs, s->max_table_entries * 4);
s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
- if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
- s->max_table_entries * 4) != s->max_table_entries * 4) {
+
+ ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable,
+ s->max_table_entries * 4);
+ if (ret < 0) {
goto fail;
}
}
}
+ if (s->free_data_block_offset > bdrv_getlength(bs->file)) {
+ error_setg(errp, "block-vpc: free_data_block_offset points after "
+ "the end of file. The image has been truncated.");
+ ret = -EINVAL;
+ goto fail;
+ }
+
s->last_bitmap_offset = (int64_t) -1;
#ifdef CACHE
migrate_add_blocker(s->migration_blocker);
return 0;
- fail:
- return err;
+
+fail:
+ qemu_vfree(s->pagetable);
+#ifdef CACHE
+ g_free(s->pageentry_u8);
+#endif
+ return ret;
+}
+
+static int vpc_reopen_prepare(BDRVReopenState *state,
+ BlockReopenQueue *queue, Error **errp)
+{
+ return 0;
}
/*
return -1;
}
+static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+ BDRVVPCState *s = (BDRVVPCState *)bs->opaque;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
+
+ if (cpu_to_be32(footer->type) != VHD_FIXED) {
+ bdi->cluster_size = s->block_size;
+ }
+
+ bdi->unallocated_blocks_are_zero = true;
+ return 0;
+}
+
static int vpc_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
int64_t offset;
int64_t sectors, sectors_per_block;
- struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
if (cpu_to_be32(footer->type) == VHD_FIXED) {
return bdrv_read(bs->file, sector_num, buf, nb_sectors);
int64_t offset;
int64_t sectors, sectors_per_block;
int ret;
- struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
if (cpu_to_be32(footer->type) == VHD_FIXED) {
return bdrv_write(bs->file, sector_num, buf, nb_sectors);
* Note that the geometry doesn't always exactly match total_sectors but
* may round it down.
*
- * Returns 0 on success, -EFBIG if the size is larger than 127 GB
+ * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override
+ * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB)
+ * and instead allow up to 255 heads.
*/
static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
uint8_t* heads, uint8_t* secs_per_cyl)
{
uint32_t cyls_times_heads;
- if (total_sectors > 65535 * 16 * 255)
+ /* Allow a maximum disk size of approximately 2 TB */
+ if (total_sectors > 65535LL * 255 * 255) {
return -EFBIG;
+ }
if (total_sectors > 65535 * 16 * 63) {
*secs_per_cyl = 255;
- *heads = 16;
+ if (total_sectors > 65535 * 16 * 255) {
+ *heads = 255;
+ } else {
+ *heads = 16;
+ }
cyls_times_heads = total_sectors / *secs_per_cyl;
} else {
*secs_per_cyl = 17;
static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors)
{
- struct vhd_dyndisk_header* dyndisk_header =
- (struct vhd_dyndisk_header*) buf;
+ VHDDynDiskHeader *dyndisk_header =
+ (VHDDynDiskHeader *) buf;
size_t block_size, num_bat_entries;
int i;
int ret = -EIO;
return ret;
}
-static int vpc_create(const char *filename, QEMUOptionParameter *options)
+static int vpc_create(const char *filename, QemuOpts *opts, Error **errp)
{
uint8_t buf[1024];
- struct vhd_footer *footer = (struct vhd_footer *) buf;
- QEMUOptionParameter *disk_type_param;
+ VHDFooter *footer = (VHDFooter *) buf;
+ char *disk_type_param;
int fd, i;
uint16_t cyls = 0;
uint8_t heads = 0;
int ret = -EIO;
/* Read out options */
- total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n;
-
- disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT);
- if (disk_type_param && disk_type_param->value.s) {
- if (!strcmp(disk_type_param->value.s, "dynamic")) {
+ total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
+ disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT);
+ if (disk_type_param) {
+ if (!strcmp(disk_type_param, "dynamic")) {
disk_type = VHD_DYNAMIC;
- } else if (!strcmp(disk_type_param->value.s, "fixed")) {
+ } else if (!strcmp(disk_type_param, "fixed")) {
disk_type = VHD_FIXED;
} else {
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
} else {
disk_type = VHD_DYNAMIC;
/* Create the file */
fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
if (fd < 0) {
- return -EIO;
+ ret = -EIO;
+ goto out;
}
/*
footer->type = be32_to_cpu(disk_type);
- /* TODO uuid is missing */
+#if defined(CONFIG_UUID)
+ uuid_generate(footer->uuid);
+#endif
footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
ret = create_fixed_disk(fd, buf, total_size);
}
- fail:
+fail:
qemu_close(fd);
+out:
+ g_free(disk_type_param);
return ret;
}
+static int vpc_has_zero_init(BlockDriverState *bs)
+{
+ BDRVVPCState *s = bs->opaque;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
+
+ if (cpu_to_be32(footer->type) == VHD_FIXED) {
+ return bdrv_has_zero_init(bs->file);
+ } else {
+ return 1;
+ }
+}
+
static void vpc_close(BlockDriverState *bs)
{
BDRVVPCState *s = bs->opaque;
- g_free(s->pagetable);
+ qemu_vfree(s->pagetable);
#ifdef CACHE
g_free(s->pageentry_u8);
#endif
error_free(s->migration_blocker);
}
-static QEMUOptionParameter vpc_create_options[] = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = OPT_SIZE,
- .help = "Virtual disk size"
- },
- {
- .name = BLOCK_OPT_SUBFMT,
- .type = OPT_STRING,
- .help =
- "Type of virtual hard disk format. Supported formats are "
- "{dynamic (default) | fixed} "
- },
- { NULL }
+static QemuOptsList vpc_create_opts = {
+ .name = "vpc-create-opts",
+ .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head),
+ .desc = {
+ {
+ .name = BLOCK_OPT_SIZE,
+ .type = QEMU_OPT_SIZE,
+ .help = "Virtual disk size"
+ },
+ {
+ .name = BLOCK_OPT_SUBFMT,
+ .type = QEMU_OPT_STRING,
+ .help =
+ "Type of virtual hard disk format. Supported formats are "
+ "{dynamic (default) | fixed} "
+ },
+ { /* end of list */ }
+ }
};
static BlockDriver bdrv_vpc = {
.format_name = "vpc",
.instance_size = sizeof(BDRVVPCState),
- .bdrv_probe = vpc_probe,
- .bdrv_open = vpc_open,
- .bdrv_close = vpc_close,
- .bdrv_create = vpc_create,
+ .bdrv_probe = vpc_probe,
+ .bdrv_open = vpc_open,
+ .bdrv_close = vpc_close,
+ .bdrv_reopen_prepare = vpc_reopen_prepare,
+ .bdrv_create = vpc_create,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
- .create_options = vpc_create_options,
+ .bdrv_get_info = vpc_get_info,
+
+ .create_opts = &vpc_create_opts,
+ .bdrv_has_zero_init = vpc_has_zero_init,
};
static void bdrv_vpc_init(void)
projects / qemu.git / blobdiff