* THE SOFTWARE.
*/
#include "qemu/osdep.h"
+#include "qapi/error.h"
#include "qemu-common.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
#include "qemu/module.h"
#include "migration/migration.h"
-#if defined(CONFIG_UUID)
-#include <uuid/uuid.h>
-#endif
+#include "qemu/bswap.h"
+#include "qemu/uuid.h"
/**************************************************************/
VHD_DIFFERENCING = 4,
};
-// Seconds since Jan 1, 2000 0:00:00 (UTC)
+/* Seconds since Jan 1, 2000 0:00:00 (UTC) */
#define VHD_TIMESTAMP_BASE 946684800
#define VHD_CHS_MAX_C 65535LL
#define VHD_CHS_MAX_H 16
#define VHD_CHS_MAX_S 255
-#define VHD_MAX_SECTORS (65535LL * 255 * 255)
+#define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */
#define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S)
#define VPC_OPT_FORCE_SIZE "force_size"
-// always big-endian
+/* always big-endian */
typedef struct vhd_footer {
- char creator[8]; // "conectix"
+ char creator[8]; /* "conectix" */
uint32_t features;
uint32_t version;
- // Offset of next header structure, 0xFFFFFFFF if none
+ /* Offset of next header structure, 0xFFFFFFFF if none */
uint64_t data_offset;
- // Seconds since Jan 1, 2000 0:00:00 (UTC)
+ /* Seconds since Jan 1, 2000 0:00:00 (UTC) */
uint32_t timestamp;
- char creator_app[4]; // "vpc "
+ char creator_app[4]; /* e.g., "vpc " */
uint16_t major;
uint16_t minor;
- char creator_os[4]; // "Wi2k"
+ char creator_os[4]; /* "Wi2k" */
uint64_t orig_size;
uint64_t current_size;
uint32_t type;
- // Checksum of the Hard Disk Footer ("one's complement of the sum of all
- // the bytes in the footer without the checksum field")
+ /* Checksum of the Hard Disk Footer ("one's complement of the sum of all
+ the bytes in the footer without the checksum field") */
uint32_t checksum;
- // UUID used to identify a parent hard disk (backing file)
- uint8_t uuid[16];
+ /* UUID used to identify a parent hard disk (backing file) */
+ QemuUUID uuid;
uint8_t in_saved_state;
} QEMU_PACKED VHDFooter;
typedef struct vhd_dyndisk_header {
- char magic[8]; // "cxsparse"
+ char magic[8]; /* "cxsparse" */
- // Offset of next header structure, 0xFFFFFFFF if none
+ /* Offset of next header structure, 0xFFFFFFFF if none */
uint64_t data_offset;
- // Offset of the Block Allocation Table (BAT)
+ /* Offset of the Block Allocation Table (BAT) */
uint64_t table_offset;
uint32_t version;
- uint32_t max_table_entries; // 32bit/entry
+ uint32_t max_table_entries; /* 32bit/entry */
- // 2 MB by default, must be a power of two
+ /* 2 MB by default, must be a power of two */
uint32_t block_size;
uint32_t checksum;
uint32_t parent_timestamp;
uint32_t reserved;
- // Backing file name (in UTF-16)
+ /* Backing file name (in UTF-16) */
uint8_t parent_name[512];
struct {
int disk_type = VHD_DYNAMIC;
int ret;
+ bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
+ false, errp);
+ if (!bs->file) {
+ return -EINVAL;
+ }
+
opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
goto fail;
}
- ret = bdrv_pread(bs->file->bs, 0, s->footer_buf, HEADER_SIZE);
+ ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE);
if (ret < 0) {
+ error_setg(errp, "Unable to read VHD header");
goto fail;
}
int64_t offset = bdrv_getlength(bs->file->bs);
if (offset < 0) {
ret = offset;
+ error_setg(errp, "Invalid file size");
goto fail;
} else if (offset < HEADER_SIZE) {
ret = -EINVAL;
+ error_setg(errp, "File too small for a VHD header");
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,
+ ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf,
HEADER_SIZE);
if (ret < 0) {
goto fail;
/* 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)
+ /* 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;
* 'qem2' : current_size QEMU (uses current_size)
* 'win ' : current_size Hyper-V
* 'd2v ' : current_size Disk2vhd
+ * 'tap\0' : current_size XenServer
+ * 'CTXS' : current_size XenConverter
*
* The user can override the table values via drive options, however
* even with an override we will still use current_size for images
*/
use_chs = (!!strncmp(footer->creator_app, "win ", 4) &&
!!strncmp(footer->creator_app, "qem2", 4) &&
- !!strncmp(footer->creator_app, "d2v ", 4)) || s->force_use_chs;
+ !!strncmp(footer->creator_app, "d2v ", 4) &&
+ !!strncmp(footer->creator_app, "CTXS", 4) &&
+ !!memcmp(footer->creator_app, "tap", 4)) || s->force_use_chs;
if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) {
bs->total_sectors = be64_to_cpu(footer->current_size) /
BDRV_SECTOR_SIZE;
}
- /* Allow a maximum disk size of approximately 2 TB */
- if (bs->total_sectors >= VHD_MAX_SECTORS) {
+ /* Allow a maximum disk size of 2040 GiB */
+ if (bs->total_sectors > VHD_MAX_SECTORS) {
ret = -EFBIG;
goto fail;
}
if (disk_type == VHD_DYNAMIC) {
- ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf,
+ ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
HEADER_SIZE);
if (ret < 0) {
+ error_setg(errp, "Error reading dynamic VHD header");
goto fail;
}
dyndisk_header = (VHDDynDiskHeader *) buf;
if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
+ error_setg(errp, "Invalid header magic");
ret = -EINVAL;
goto fail;
}
s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
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) {
+ error_setg(errp, "Too many blocks");
ret = -EINVAL;
goto fail;
}
computed_size = (uint64_t) s->max_table_entries * s->block_size;
if (computed_size < bs->total_sectors * 512) {
+ error_setg(errp, "Page table too small");
ret = -EINVAL;
goto fail;
}
s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size);
if (s->pagetable == NULL) {
+ error_setg(errp, "Unable to allocate memory for page table");
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,
+ ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable,
pagetable_size);
if (ret < 0) {
+ error_setg(errp, "Error reading pagetable");
goto fail;
}
#endif
}
- 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);
+ ret = migrate_add_blocker(s->migration_blocker, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ error_free(s->migration_blocker);
+ goto fail;
+ }
+
+ qemu_co_mutex_init(&s->lock);
return 0;
* The parameter write must be 1 if the offset will be used for a write
* operation (the block bitmaps is updated then), 0 otherwise.
*/
-static inline int64_t get_sector_offset(BlockDriverState *bs,
- int64_t sector_num, int write)
+static inline int64_t get_image_offset(BlockDriverState *bs, uint64_t offset,
+ bool write)
{
BDRVVPCState *s = bs->opaque;
- uint64_t offset = sector_num * 512;
uint64_t bitmap_offset, block_offset;
- uint32_t pagetable_index, pageentry_index;
+ uint32_t pagetable_index, offset_in_block;
pagetable_index = offset / s->block_size;
- pageentry_index = (offset % s->block_size) / 512;
+ offset_in_block = offset % s->block_size;
if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
- return -1; // not allocated
+ return -1; /* not allocated */
bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
- block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
+ block_offset = bitmap_offset + s->bitmap_size + offset_in_block;
- // We must ensure that we don't write to any sectors which are marked as
- // unused in the bitmap. We get away with setting all bits in the block
- // bitmap each time we write to a new block. This might cause Virtual PC to
- // miss sparse read optimization, but it's not a problem in terms of
- // correctness.
+ /* We must ensure that we don't write to any sectors which are marked as
+ unused in the bitmap. We get away with setting all bits in the block
+ bitmap each time we write to a new block. This might cause Virtual PC to
+ miss sparse read optimization, but it's not a problem in terms of
+ correctness. */
if (write && (s->last_bitmap_offset != bitmap_offset)) {
uint8_t bitmap[s->bitmap_size];
s->last_bitmap_offset = bitmap_offset;
memset(bitmap, 0xff, s->bitmap_size);
- bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size);
+ bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
}
return block_offset;
}
+static inline int64_t get_sector_offset(BlockDriverState *bs,
+ int64_t sector_num, bool write)
+{
+ return get_image_offset(bs, sector_num * BDRV_SECTOR_SIZE, write);
+}
+
/*
* Writes the footer to the end of the image file. This is needed when the
* file grows as it overwrites the old footer
BDRVVPCState *s = bs->opaque;
int64_t offset = s->free_data_block_offset;
- ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE);
+ ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
if (ret < 0)
return ret;
*
* Returns the sectors' offset in the image file on success and < 0 on error
*/
-static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
+static int64_t alloc_block(BlockDriverState* bs, int64_t offset)
{
BDRVVPCState *s = bs->opaque;
int64_t bat_offset;
int ret;
uint8_t bitmap[s->bitmap_size];
- // Check if sector_num is valid
- if ((sector_num < 0) || (sector_num > bs->total_sectors))
- return -1;
-
- // Write entry into in-memory BAT
- index = (sector_num * 512) / s->block_size;
- if (s->pagetable[index] != 0xFFFFFFFF)
- return -1;
+ /* Check if sector_num is valid */
+ if ((offset < 0) || (offset > bs->total_sectors * BDRV_SECTOR_SIZE)) {
+ return -EINVAL;
+ }
+ /* Write entry into in-memory BAT */
+ index = offset / s->block_size;
+ assert(s->pagetable[index] == 0xFFFFFFFF);
s->pagetable[index] = s->free_data_block_offset / 512;
- // Initialize the block's bitmap
+ /* Initialize the block's bitmap */
memset(bitmap, 0xff, s->bitmap_size);
- ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap,
+ ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
s->bitmap_size);
if (ret < 0) {
return ret;
}
- // Write new footer (the old one will be overwritten)
+ /* Write new footer (the old one will be overwritten) */
s->free_data_block_offset += s->block_size + s->bitmap_size;
ret = rewrite_footer(bs);
if (ret < 0)
goto fail;
- // Write BAT entry to disk
+ /* Write BAT entry to disk */
bat_offset = s->bat_offset + (4 * index);
bat_value = cpu_to_be32(s->pagetable[index]);
- ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4);
+ ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
if (ret < 0)
goto fail;
- return get_sector_offset(bs, sector_num, 0);
+ return get_image_offset(bs, offset, false);
fail:
s->free_data_block_offset -= (s->block_size + s->bitmap_size);
- return -1;
+ return ret;
}
static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
return 0;
}
-static int vpc_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
+static int coroutine_fn
+vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
{
BDRVVPCState *s = bs->opaque;
int ret;
- int64_t offset;
- int64_t sectors, sectors_per_block;
+ int64_t image_offset;
+ int64_t n_bytes;
+ int64_t bytes_done = 0;
VHDFooter *footer = (VHDFooter *) s->footer_buf;
+ QEMUIOVector local_qiov;
if (be32_to_cpu(footer->type) == VHD_FIXED) {
- return bdrv_read(bs->file->bs, sector_num, buf, nb_sectors);
+ return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0);
}
- while (nb_sectors > 0) {
- offset = get_sector_offset(bs, sector_num, 0);
- sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
- sectors = sectors_per_block - (sector_num % sectors_per_block);
- if (sectors > nb_sectors) {
- sectors = nb_sectors;
- }
+ qemu_co_mutex_lock(&s->lock);
+ qemu_iovec_init(&local_qiov, qiov->niov);
- if (offset == -1) {
- memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
+ while (bytes > 0) {
+ image_offset = get_image_offset(bs, offset, false);
+ n_bytes = MIN(bytes, s->block_size - (offset % s->block_size));
+
+ if (image_offset == -1) {
+ qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
} else {
- ret = bdrv_pread(bs->file->bs, offset, buf,
- sectors * BDRV_SECTOR_SIZE);
- if (ret != sectors * BDRV_SECTOR_SIZE) {
- return -1;
+ qemu_iovec_reset(&local_qiov);
+ qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
+
+ ret = bdrv_co_preadv(bs->file, image_offset, n_bytes,
+ &local_qiov, 0);
+ if (ret < 0) {
+ goto fail;
}
}
- nb_sectors -= sectors;
- sector_num += sectors;
- buf += sectors * BDRV_SECTOR_SIZE;
+ bytes -= n_bytes;
+ offset += n_bytes;
+ bytes_done += n_bytes;
}
- 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);
+ ret = 0;
+fail:
+ qemu_iovec_destroy(&local_qiov);
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)
+static int coroutine_fn
+vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
{
BDRVVPCState *s = bs->opaque;
- int64_t offset;
- int64_t sectors, sectors_per_block;
+ int64_t image_offset;
+ int64_t n_bytes;
+ int64_t bytes_done = 0;
int ret;
VHDFooter *footer = (VHDFooter *) s->footer_buf;
+ QEMUIOVector local_qiov;
if (be32_to_cpu(footer->type) == VHD_FIXED) {
- return bdrv_write(bs->file->bs, sector_num, buf, nb_sectors);
+ return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0);
}
- while (nb_sectors > 0) {
- offset = get_sector_offset(bs, sector_num, 1);
- sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
- sectors = sectors_per_block - (sector_num % sectors_per_block);
- if (sectors > nb_sectors) {
- sectors = nb_sectors;
- }
+ qemu_co_mutex_lock(&s->lock);
+ qemu_iovec_init(&local_qiov, qiov->niov);
- if (offset == -1) {
- offset = alloc_block(bs, sector_num);
- if (offset < 0)
- return -1;
+ while (bytes > 0) {
+ image_offset = get_image_offset(bs, offset, true);
+ n_bytes = MIN(bytes, s->block_size - (offset % s->block_size));
+
+ if (image_offset == -1) {
+ image_offset = alloc_block(bs, offset);
+ if (image_offset < 0) {
+ ret = image_offset;
+ goto fail;
+ }
}
- ret = bdrv_pwrite(bs->file->bs, offset, buf,
- sectors * BDRV_SECTOR_SIZE);
- if (ret != sectors * BDRV_SECTOR_SIZE) {
- return -1;
+ qemu_iovec_reset(&local_qiov);
+ qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
+
+ ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes,
+ &local_qiov, 0);
+ if (ret < 0) {
+ goto fail;
}
- nb_sectors -= sectors;
- sector_num += sectors;
- buf += sectors * BDRV_SECTOR_SIZE;
+ bytes -= n_bytes;
+ offset += n_bytes;
+ bytes_done += n_bytes;
}
- return 0;
-}
-
-static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
- const uint8_t *buf, int nb_sectors)
-{
- int ret;
- BDRVVPCState *s = bs->opaque;
- qemu_co_mutex_lock(&s->lock);
- ret = vpc_write(bs, sector_num, buf, nb_sectors);
+ ret = 0;
+fail:
+ qemu_iovec_destroy(&local_qiov);
qemu_co_mutex_unlock(&s->lock);
+
return ret;
}
* 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 ~2 TB. Override
+ * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override
* the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB)
* and instead allow up to 255 heads.
*/
int ret;
int64_t offset = 0;
- // Write the footer (twice: at the beginning and at the end)
+ /* 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 = blk_pwrite(blk, offset, buf, HEADER_SIZE);
- if (ret) {
+ ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0);
+ if (ret < 0) {
goto fail;
}
offset = 1536 + ((num_bat_entries * 4 + 511) & ~511);
- ret = blk_pwrite(blk, offset, buf, HEADER_SIZE);
+ ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0);
if (ret < 0) {
goto fail;
}
- // Write the initial BAT
+ /* Write the initial BAT */
offset = 3 * 512;
memset(buf, 0xFF, 512);
for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
- ret = blk_pwrite(blk, offset, buf, 512);
+ ret = blk_pwrite(blk, offset, buf, 512, 0);
if (ret < 0) {
goto fail;
}
offset += 512;
}
- // Prepare the Dynamic Disk Header
+ /* Prepare the Dynamic Disk Header */
memset(buf, 0, 1024);
memcpy(dyndisk_header->magic, "cxsparse", 8);
dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024));
- // Write the header
+ /* Write the header */
offset = 512;
- ret = blk_pwrite(blk, offset, buf, 1024);
+ ret = blk_pwrite(blk, offset, buf, 1024, 0);
if (ret < 0) {
goto fail;
}
return ret;
}
- ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE);
+ ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE, 0);
if (ret < 0) {
return ret;
}
} else if (!strcmp(disk_type_param, "fixed")) {
disk_type = VHD_FIXED;
} else {
+ error_setg(errp, "Invalid disk type, %s", disk_type_param);
ret = -EINVAL;
goto out;
}
goto out;
}
- blk = blk_new_open("image", filename, NULL, NULL,
- BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
+ blk = blk_new_open(filename, NULL, NULL,
+ BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
&local_err);
if (blk == NULL) {
error_propagate(errp, local_err);
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 */
+ /* Allow a maximum disk size of 2040 GiB */
if (total_sectors > VHD_MAX_SECTORS) {
+ error_setg(errp, "Disk size is too large, max size is 2040 GiB");
ret = -EFBIG;
goto out;
}
footer->type = cpu_to_be32(disk_type);
-#if defined(CONFIG_UUID)
- uuid_generate(footer->uuid);
-#endif
+ qemu_uuid_generate(&footer->uuid);
footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));
} else {
ret = create_fixed_disk(blk, buf, total_size);
}
+ if (ret < 0) {
+ error_setg(errp, "Unable to create or write VHD header");
+ }
out:
blk_unref(blk);
.bdrv_open = vpc_open,
.bdrv_close = vpc_close,
.bdrv_reopen_prepare = vpc_reopen_prepare,
+ .bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = vpc_create,
- .bdrv_read = vpc_co_read,
- .bdrv_write = vpc_co_write,
+ .bdrv_co_preadv = vpc_co_preadv,
+ .bdrv_co_pwritev = vpc_co_pwritev,
.bdrv_co_get_block_status = vpc_co_get_block_status,
.bdrv_get_info = vpc_get_info,
projects / mirror_qemu.git / blobdiff