* THE SOFTWARE.
*/
#include "qemu-common.h"
-#include "block_int.h"
-#include "module.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)
+#define VHD_MAX_GEOMETRY (65535LL * 16 * 255)
+
// always big-endian
-struct vhd_footer {
+typedef struct vhd_footer {
char creator[8]; // "conectix"
uint32_t features;
uint32_t version;
char creator_os[4]; // "Wi2k"
uint64_t orig_size;
- uint64_t size;
+ uint64_t current_size;
uint16_t cyls;
uint8_t heads;
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;
uint8_t footer_buf[HEADER_SIZE];
uint64_t free_data_block_offset;
int max_table_entries;
uint64_t last_bitmap;
#endif
+
+ Error *migration_blocker;
} BDRVVPCState;
static uint32_t vpc_checksum(uint8_t* buf, size_t size)
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;
+ uint64_t pagetable_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->bs, 0, s->footer_buf, HEADER_SIZE);
+ if (ret < 0) {
goto fail;
+ }
- footer = (struct vhd_footer*) s->footer_buf;
- if (strncmp(footer->creator, "conectix", 8))
- goto fail;
+ footer = (VHDFooter *) s->footer_buf;
+ if (strncmp(footer->creator, "conectix", 8)) {
+ int64_t offset = bdrv_getlength(bs->file->bs);
+ 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 */
+ ret = bdrv_pread(bs->file->bs, 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;
+ }
checksum = be32_to_cpu(footer->checksum);
footer->checksum = 0;
fprintf(stderr, "block-vpc: The header checksum of '%s' is "
"incorrect.\n", bs->filename);
+ /* Write 'checksum' back to footer, or else will leave it with zero. */
+ footer->checksum = cpu_to_be32(checksum);
+
// The visible size of a image in Virtual PC depends on the geometry
// rather than on the size stored in the footer (the size in the footer
// is too large usually)
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;
- goto fail;
+ /* Images that have exactly the maximum geometry are probably bigger and
+ * would be truncated if we adhered to the geometry for them. Rely on
+ * footer->current_size for them. */
+ if (bs->total_sectors == VHD_MAX_GEOMETRY) {
+ bs->total_sectors = be64_to_cpu(footer->current_size) /
+ BDRV_SECTOR_SIZE;
}
- if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
- != HEADER_SIZE)
+ /* Allow a maximum disk size of approximately 2 TB */
+ if (bs->total_sectors >= VHD_MAX_SECTORS) {
+ ret = -EFBIG;
goto fail;
+ }
- dyndisk_header = (struct vhd_dyndisk_header*) buf;
+ if (disk_type == VHD_DYNAMIC) {
+ ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf,
+ HEADER_SIZE);
+ if (ret < 0) {
+ goto fail;
+ }
- if (strncmp(dyndisk_header->magic, "cxsparse", 8))
- goto fail;
+ 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);
- s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
+ 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);
+ s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
- 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)
- goto fail;
+ 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;
+ }
- s->free_data_block_offset =
- (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
+ computed_size = (uint64_t) s->max_table_entries * s->block_size;
+ if (computed_size < bs->total_sectors * 512) {
+ ret = -EINVAL;
+ goto fail;
+ }
- for (i = 0; i < s->max_table_entries; i++) {
- be32_to_cpus(&s->pagetable[i]);
- if (s->pagetable[i] != 0xFFFFFFFF) {
- int64_t next = (512 * (int64_t) s->pagetable[i]) +
- s->bitmap_size + s->block_size;
+ if (s->max_table_entries > SIZE_MAX / 4 ||
+ s->max_table_entries > (int) INT_MAX / 4) {
+ error_setg(errp, "Max Table Entries too large (%" PRId32 ")",
+ s->max_table_entries);
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ pagetable_size = (uint64_t) s->max_table_entries * 4;
- if (next> s->free_data_block_offset)
- s->free_data_block_offset = next;
+ s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size);
+ if (s->pagetable == NULL) {
+ ret = -ENOMEM;
+ goto fail;
}
+
+ s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
+
+ ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable,
+ pagetable_size);
+ if (ret < 0) {
+ goto fail;
+ }
+
+ s->free_data_block_offset =
+ ROUND_UP(s->bat_offset + pagetable_size, 512);
+
+ for (i = 0; i < s->max_table_entries; i++) {
+ be32_to_cpus(&s->pagetable[i]);
+ if (s->pagetable[i] != 0xFFFFFFFF) {
+ int64_t next = (512 * (int64_t) s->pagetable[i]) +
+ s->bitmap_size + s->block_size;
+
+ if (next > s->free_data_block_offset) {
+ s->free_data_block_offset = next;
+ }
+ }
+ }
+
+ if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) {
+ 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
+ s->pageentry_u8 = g_malloc(512);
+ s->pageentry_u32 = s->pageentry_u8;
+ s->pageentry_u16 = s->pageentry_u8;
+ s->last_pagetable = -1;
+#endif
}
- s->last_bitmap_offset = (int64_t) -1;
+ qemu_co_mutex_init(&s->lock);
+ /* Disable migration when VHD images are used */
+ error_setg(&s->migration_blocker, "The vpc format used by node '%s' "
+ "does not support live migration",
+ bdrv_get_device_or_node_name(bs));
+ migrate_add_blocker(s->migration_blocker);
+
+ return 0;
+
+fail:
+ qemu_vfree(s->pagetable);
#ifdef CACHE
- s->pageentry_u8 = g_malloc(512);
- s->pageentry_u32 = s->pageentry_u8;
- s->pageentry_u16 = s->pageentry_u8;
- s->last_pagetable = -1;
+ g_free(s->pageentry_u8);
#endif
+ return ret;
+}
+static int vpc_reopen_prepare(BDRVReopenState *state,
+ BlockReopenQueue *queue, Error **errp)
+{
return 0;
- fail:
- return err;
}
/*
s->last_bitmap_offset = bitmap_offset;
memset(bitmap, 0xff, s->bitmap_size);
- bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
- }
-
-// printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
-// sector_num, pagetable_index, pageentry_index,
-// bitmap_offset, block_offset);
-
-// disabled by reason
-#if 0
-#ifdef CACHE
- if (bitmap_offset != s->last_bitmap)
- {
- lseek(s->fd, bitmap_offset, SEEK_SET);
-
- s->last_bitmap = bitmap_offset;
-
- // Scary! Bitmap is stored as big endian 32bit entries,
- // while we used to look it up byte by byte
- read(s->fd, s->pageentry_u8, 512);
- for (i = 0; i < 128; i++)
- be32_to_cpus(&s->pageentry_u32[i]);
+ bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size);
}
- if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
- return -1;
-#else
- lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
-
- read(s->fd, &bitmap_entry, 1);
-
- if ((bitmap_entry >> (pageentry_index % 8)) & 1)
- return -1; // not allocated
-#endif
-#endif
-
return block_offset;
}
BDRVVPCState *s = bs->opaque;
int64_t offset = s->free_data_block_offset;
- ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
+ ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE);
if (ret < 0)
return ret;
// Initialize the block's bitmap
memset(bitmap, 0xff, s->bitmap_size);
- bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
+ ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap,
s->bitmap_size);
+ if (ret < 0) {
+ return ret;
+ }
// Write new footer (the old one will be overwritten)
s->free_data_block_offset += s->block_size + s->bitmap_size;
// Write BAT entry to disk
bat_offset = s->bat_offset + (4 * index);
- bat_value = be32_to_cpu(s->pagetable[index]);
- ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
+ bat_value = cpu_to_be32(s->pagetable[index]);
+ ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4);
if (ret < 0)
goto fail;
return -1;
}
+static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+ BDRVVPCState *s = (BDRVVPCState *)bs->opaque;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
+
+ if (be32_to_cpu(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;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
+ if (be32_to_cpu(footer->type) == VHD_FIXED) {
+ return bdrv_read(bs->file->bs, sector_num, buf, nb_sectors);
+ }
while (nb_sectors > 0) {
offset = get_sector_offset(bs, sector_num, 0);
if (offset == -1) {
memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
} else {
- ret = bdrv_pread(bs->file, offset, buf,
+ ret = bdrv_pread(bs->file->bs, offset, buf,
sectors * BDRV_SECTOR_SIZE);
if (ret != sectors * BDRV_SECTOR_SIZE) {
return -1;
return 0;
}
+static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
+{
+ int ret;
+ BDRVVPCState *s = bs->opaque;
+ qemu_co_mutex_lock(&s->lock);
+ ret = vpc_read(bs, sector_num, buf, nb_sectors);
+ qemu_co_mutex_unlock(&s->lock);
+ return ret;
+}
+
static int vpc_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
int64_t offset;
int64_t sectors, sectors_per_block;
int ret;
+ VHDFooter *footer = (VHDFooter *) s->footer_buf;
+ if (be32_to_cpu(footer->type) == VHD_FIXED) {
+ return bdrv_write(bs->file->bs, sector_num, buf, nb_sectors);
+ }
while (nb_sectors > 0) {
offset = get_sector_offset(bs, sector_num, 1);
return -1;
}
- ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
+ ret = bdrv_pwrite(bs->file->bs, offset, buf,
+ sectors * BDRV_SECTOR_SIZE);
if (ret != sectors * BDRV_SECTOR_SIZE) {
return -1;
}
return 0;
}
-static int vpc_flush(BlockDriverState *bs)
+static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
{
- return bdrv_flush(bs->file);
+ int ret;
+ BDRVVPCState *s = bs->opaque;
+ qemu_co_mutex_lock(&s->lock);
+ ret = vpc_write(bs, sector_num, buf, nb_sectors);
+ qemu_co_mutex_unlock(&s->lock);
+ return ret;
+}
+
+static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors, int *pnum)
+{
+ BDRVVPCState *s = bs->opaque;
+ VHDFooter *footer = (VHDFooter*) s->footer_buf;
+ int64_t start, offset;
+ bool allocated;
+ int n;
+
+ if (be32_to_cpu(footer->type) == VHD_FIXED) {
+ *pnum = nb_sectors;
+ return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+ (sector_num << BDRV_SECTOR_BITS);
+ }
+
+ offset = get_sector_offset(bs, sector_num, 0);
+ start = offset;
+ allocated = (offset != -1);
+ *pnum = 0;
+
+ do {
+ /* All sectors in a block are contiguous (without using the bitmap) */
+ n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE)
+ - sector_num;
+ n = MIN(n, nb_sectors);
+
+ *pnum += n;
+ sector_num += n;
+ nb_sectors -= n;
+ /* *pnum can't be greater than one block for allocated
+ * sectors since there is always a bitmap in between. */
+ if (allocated) {
+ return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
+ }
+ if (nb_sectors == 0) {
+ break;
+ }
+ offset = get_sector_offset(bs, sector_num, 0);
+ } while (offset == -1);
+
+ return 0;
}
/*
* 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)
- return -EFBIG;
+ total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY);
- if (total_sectors > 65535 * 16 * 63) {
+ if (total_sectors >= 65535LL * 16 * 63) {
*secs_per_cyl = 255;
*heads = 16;
cyls_times_heads = total_sectors / *secs_per_cyl;
cyls_times_heads = total_sectors / *secs_per_cyl;
*heads = (cyls_times_heads + 1023) / 1024;
- if (*heads < 4)
+ if (*heads < 4) {
*heads = 4;
+ }
if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
*secs_per_cyl = 31;
return 0;
}
-static int vpc_create(const char *filename, QEMUOptionParameter *options)
+static int create_dynamic_disk(BlockDriverState *bs, uint8_t *buf,
+ int64_t total_sectors)
{
- uint8_t buf[1024];
- struct vhd_footer* footer = (struct vhd_footer*) buf;
- struct vhd_dyndisk_header* dyndisk_header =
- (struct vhd_dyndisk_header*) buf;
- int fd, i;
- uint16_t cyls = 0;
- uint8_t heads = 0;
- uint8_t secs_per_cyl = 0;
+ VHDDynDiskHeader *dyndisk_header =
+ (VHDDynDiskHeader *) buf;
size_t block_size, num_bat_entries;
- int64_t total_sectors = 0;
- int ret = -EIO;
+ int i;
+ int ret;
+ int64_t offset = 0;
+
+ // Write the footer (twice: at the beginning and at the end)
+ block_size = 0x200000;
+ num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
- // Read out options
- total_sectors = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n /
- BDRV_SECTOR_SIZE;
+ ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE);
+ if (ret) {
+ goto fail;
+ }
- // Create the file
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
- if (fd < 0)
- return -EIO;
+ offset = 1536 + ((num_bat_entries * 4 + 511) & ~511);
+ ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE);
+ if (ret < 0) {
+ goto fail;
+ }
- /* Calculate matching total_size and geometry. Increase the number of
- sectors requested until we get enough (or fail). */
- for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
- if (calculate_geometry(total_sectors + i,
- &cyls, &heads, &secs_per_cyl)) {
- ret = -EFBIG;
+ // Write the initial BAT
+ offset = 3 * 512;
+
+ memset(buf, 0xFF, 512);
+ for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
+ ret = bdrv_pwrite_sync(bs, offset, buf, 512);
+ if (ret < 0) {
goto fail;
}
+ offset += 512;
}
- total_sectors = (int64_t) cyls * heads * secs_per_cyl;
- // Prepare the Hard Disk Footer
+ // Prepare the Dynamic Disk Header
memset(buf, 0, 1024);
- memcpy(footer->creator, "conectix", 8);
- // TODO Check if "qemu" creator_app is ok for VPC
- memcpy(footer->creator_app, "qemu", 4);
- memcpy(footer->creator_os, "Wi2k", 4);
+ memcpy(dyndisk_header->magic, "cxsparse", 8);
- footer->features = be32_to_cpu(0x02);
- footer->version = be32_to_cpu(0x00010000);
- footer->data_offset = be64_to_cpu(HEADER_SIZE);
- footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
+ /*
+ * Note: The spec is actually wrong here for data_offset, it says
+ * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
+ */
+ dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL);
+ dyndisk_header->table_offset = cpu_to_be64(3 * 512);
+ dyndisk_header->version = cpu_to_be32(0x00010000);
+ dyndisk_header->block_size = cpu_to_be32(block_size);
+ dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries);
- // Version of Virtual PC 2007
- footer->major = be16_to_cpu(0x0005);
- footer->minor =be16_to_cpu(0x0003);
+ dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024));
- footer->orig_size = be64_to_cpu(total_sectors * 512);
- footer->size = be64_to_cpu(total_sectors * 512);
+ // Write the header
+ offset = 512;
- footer->cyls = be16_to_cpu(cyls);
- footer->heads = heads;
- footer->secs_per_cyl = secs_per_cyl;
+ ret = bdrv_pwrite_sync(bs, offset, buf, 1024);
+ if (ret < 0) {
+ goto fail;
+ }
- footer->type = be32_to_cpu(VHD_DYNAMIC);
+ fail:
+ return ret;
+}
- // TODO uuid is missing
+static int create_fixed_disk(BlockDriverState *bs, uint8_t *buf,
+ int64_t total_size)
+{
+ int ret;
- footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
+ /* Add footer to total size */
+ total_size += HEADER_SIZE;
- // Write the footer (twice: at the beginning and at the end)
- block_size = 0x200000;
- num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
+ ret = bdrv_truncate(bs, total_size);
+ if (ret < 0) {
+ return ret;
+ }
- if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
- goto fail;
+ ret = bdrv_pwrite_sync(bs, total_size - HEADER_SIZE, buf, HEADER_SIZE);
+ if (ret < 0) {
+ return ret;
}
- if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) {
- goto fail;
+ return ret;
+}
+
+static int vpc_create(const char *filename, QemuOpts *opts, Error **errp)
+{
+ uint8_t buf[1024];
+ VHDFooter *footer = (VHDFooter *) buf;
+ char *disk_type_param;
+ int i;
+ uint16_t cyls = 0;
+ uint8_t heads = 0;
+ uint8_t secs_per_cyl = 0;
+ int64_t total_sectors;
+ int64_t total_size;
+ int disk_type;
+ int ret = -EIO;
+ Error *local_err = NULL;
+ BlockDriverState *bs = NULL;
+
+ /* Read out options */
+ total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
+ BDRV_SECTOR_SIZE);
+ 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, "fixed")) {
+ disk_type = VHD_FIXED;
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ disk_type = VHD_DYNAMIC;
}
- if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
- goto fail;
+
+ ret = bdrv_create_file(filename, opts, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
+ &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto out;
}
- // Write the initial BAT
- if (lseek(fd, 3 * 512, SEEK_SET) < 0) {
- goto fail;
+ /*
+ * Calculate matching total_size and geometry. Increase the number of
+ * sectors requested until we get enough (or fail). This ensures that
+ * qemu-img convert doesn't truncate images, but rather rounds up.
+ *
+ * If the image size can't be represented by a spec conform CHS geometry,
+ * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use
+ * the image size from the VHD footer to calculate total_sectors.
+ */
+ total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE);
+ for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
+ calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl);
}
- memset(buf, 0xFF, 512);
- for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
- if (write(fd, buf, 512) != 512) {
- goto fail;
+ if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) {
+ total_sectors = total_size / BDRV_SECTOR_SIZE;
+ /* Allow a maximum disk size of approximately 2 TB */
+ if (total_sectors > VHD_MAX_SECTORS) {
+ ret = -EFBIG;
+ goto out;
}
+ } else {
+ total_sectors = (int64_t)cyls * heads * secs_per_cyl;
+ total_size = total_sectors * BDRV_SECTOR_SIZE;
}
-
- // Prepare the Dynamic Disk Header
+ /* Prepare the Hard Disk Footer */
memset(buf, 0, 1024);
- memcpy(dyndisk_header->magic, "cxsparse", 8);
+ memcpy(footer->creator, "conectix", 8);
+ /* TODO Check if "qemu" creator_app is ok for VPC */
+ memcpy(footer->creator_app, "qemu", 4);
+ memcpy(footer->creator_os, "Wi2k", 4);
- dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
- dyndisk_header->table_offset = be64_to_cpu(3 * 512);
- dyndisk_header->version = be32_to_cpu(0x00010000);
- dyndisk_header->block_size = be32_to_cpu(block_size);
- dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
+ footer->features = cpu_to_be32(0x02);
+ footer->version = cpu_to_be32(0x00010000);
+ if (disk_type == VHD_DYNAMIC) {
+ footer->data_offset = cpu_to_be64(HEADER_SIZE);
+ } else {
+ footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL);
+ }
+ footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE);
+
+ /* Version of Virtual PC 2007 */
+ footer->major = cpu_to_be16(0x0005);
+ footer->minor = cpu_to_be16(0x0003);
+ footer->orig_size = cpu_to_be64(total_size);
+ footer->current_size = cpu_to_be64(total_size);
+ footer->cyls = cpu_to_be16(cyls);
+ footer->heads = heads;
+ footer->secs_per_cyl = secs_per_cyl;
- dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
+ footer->type = cpu_to_be32(disk_type);
- // Write the header
- if (lseek(fd, 512, SEEK_SET) < 0) {
- goto fail;
- }
+#if defined(CONFIG_UUID)
+ uuid_generate(footer->uuid);
+#endif
- if (write(fd, buf, 1024) != 1024) {
- goto fail;
+ footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));
+
+ if (disk_type == VHD_DYNAMIC) {
+ ret = create_dynamic_disk(bs, buf, total_sectors);
+ } else {
+ ret = create_fixed_disk(bs, buf, total_size);
}
- ret = 0;
- fail:
- close(fd);
+out:
+ bdrv_unref(bs);
+ 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 (be32_to_cpu(footer->type) == VHD_FIXED) {
+ return bdrv_has_zero_init(bs->file->bs);
+ } 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
+
+ migrate_del_blocker(s->migration_blocker);
+ error_free(s->migration_blocker);
}
-static QEMUOptionParameter vpc_create_options[] = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = OPT_SIZE,
- .help = "Virtual disk size"
- },
- { 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_read = vpc_read,
- .bdrv_write = vpc_write,
- .bdrv_flush = vpc_flush,
- .bdrv_close = vpc_close,
- .bdrv_create = vpc_create,
-
- .create_options = vpc_create_options,
+
+ .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,
+ .bdrv_co_get_block_status = vpc_co_get_block_status,
+
+ .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