mirror of
https://github.com/qemu/qemu.git
synced 2024-12-11 20:53:51 +08:00
c088b69136
After validation check, the 'checksum' is not written back to footer, which leave it with zero. This results in errors while loadding it under Microsoft's Hyper-V environment, and also errors from utilities like Citrix's vhd-util. Signed-off-by: Zhang Shengju <sean_zhang@trendmicro.com.cn> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
800 lines
22 KiB
C
800 lines
22 KiB
C
/*
|
|
* Block driver for Connectix / Microsoft Virtual PC images
|
|
*
|
|
* Copyright (c) 2005 Alex Beregszaszi
|
|
* Copyright (c) 2009 Kevin Wolf <kwolf@suse.de>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#include "qemu-common.h"
|
|
#include "block_int.h"
|
|
#include "module.h"
|
|
#include "migration.h"
|
|
|
|
/**************************************************************/
|
|
|
|
#define HEADER_SIZE 512
|
|
|
|
//#define CACHE
|
|
|
|
enum vhd_type {
|
|
VHD_FIXED = 2,
|
|
VHD_DYNAMIC = 3,
|
|
VHD_DIFFERENCING = 4,
|
|
};
|
|
|
|
// Seconds since Jan 1, 2000 0:00:00 (UTC)
|
|
#define VHD_TIMESTAMP_BASE 946684800
|
|
|
|
// always big-endian
|
|
struct vhd_footer {
|
|
char creator[8]; // "conectix"
|
|
uint32_t features;
|
|
uint32_t version;
|
|
|
|
// Offset of next header structure, 0xFFFFFFFF if none
|
|
uint64_t data_offset;
|
|
|
|
// Seconds since Jan 1, 2000 0:00:00 (UTC)
|
|
uint32_t timestamp;
|
|
|
|
char creator_app[4]; // "vpc "
|
|
uint16_t major;
|
|
uint16_t minor;
|
|
char creator_os[4]; // "Wi2k"
|
|
|
|
uint64_t orig_size;
|
|
uint64_t size;
|
|
|
|
uint16_t cyls;
|
|
uint8_t heads;
|
|
uint8_t secs_per_cyl;
|
|
|
|
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")
|
|
uint32_t checksum;
|
|
|
|
// UUID used to identify a parent hard disk (backing file)
|
|
uint8_t uuid[16];
|
|
|
|
uint8_t in_saved_state;
|
|
};
|
|
|
|
struct vhd_dyndisk_header {
|
|
char magic[8]; // "cxsparse"
|
|
|
|
// Offset of next header structure, 0xFFFFFFFF if none
|
|
uint64_t data_offset;
|
|
|
|
// Offset of the Block Allocation Table (BAT)
|
|
uint64_t table_offset;
|
|
|
|
uint32_t version;
|
|
uint32_t max_table_entries; // 32bit/entry
|
|
|
|
// 2 MB by default, must be a power of two
|
|
uint32_t block_size;
|
|
|
|
uint32_t checksum;
|
|
uint8_t parent_uuid[16];
|
|
uint32_t parent_timestamp;
|
|
uint32_t reserved;
|
|
|
|
// Backing file name (in UTF-16)
|
|
uint8_t parent_name[512];
|
|
|
|
struct {
|
|
uint32_t platform;
|
|
uint32_t data_space;
|
|
uint32_t data_length;
|
|
uint32_t reserved;
|
|
uint64_t data_offset;
|
|
} parent_locator[8];
|
|
};
|
|
|
|
typedef struct BDRVVPCState {
|
|
CoMutex lock;
|
|
uint8_t footer_buf[HEADER_SIZE];
|
|
uint64_t free_data_block_offset;
|
|
int max_table_entries;
|
|
uint32_t *pagetable;
|
|
uint64_t bat_offset;
|
|
uint64_t last_bitmap_offset;
|
|
|
|
uint32_t block_size;
|
|
uint32_t bitmap_size;
|
|
|
|
#ifdef CACHE
|
|
uint8_t *pageentry_u8;
|
|
uint32_t *pageentry_u32;
|
|
uint16_t *pageentry_u16;
|
|
|
|
uint64_t last_bitmap;
|
|
#endif
|
|
|
|
Error *migration_blocker;
|
|
} BDRVVPCState;
|
|
|
|
static uint32_t vpc_checksum(uint8_t* buf, size_t size)
|
|
{
|
|
uint32_t res = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
res += buf[i];
|
|
|
|
return ~res;
|
|
}
|
|
|
|
|
|
static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
|
|
{
|
|
if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
|
|
return 100;
|
|
return 0;
|
|
}
|
|
|
|
static int vpc_open(BlockDriverState *bs, int flags)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
int i;
|
|
struct vhd_footer* footer;
|
|
struct vhd_dyndisk_header* dyndisk_header;
|
|
uint8_t buf[HEADER_SIZE];
|
|
uint32_t checksum;
|
|
int err = -1;
|
|
int disk_type = VHD_DYNAMIC;
|
|
|
|
if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
|
|
goto fail;
|
|
|
|
footer = (struct vhd_footer*) s->footer_buf;
|
|
if (strncmp(footer->creator, "conectix", 8)) {
|
|
int64_t offset = bdrv_getlength(bs->file);
|
|
if (offset < HEADER_SIZE) {
|
|
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) {
|
|
goto fail;
|
|
}
|
|
if (strncmp(footer->creator, "conectix", 8)) {
|
|
goto fail;
|
|
}
|
|
disk_type = VHD_FIXED;
|
|
}
|
|
|
|
checksum = be32_to_cpu(footer->checksum);
|
|
footer->checksum = 0;
|
|
if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
|
|
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 = be32_to_cpu(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;
|
|
}
|
|
|
|
if (disk_type == VHD_DYNAMIC) {
|
|
if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
|
|
HEADER_SIZE) != HEADER_SIZE) {
|
|
goto fail;
|
|
}
|
|
|
|
dyndisk_header = (struct vhd_dyndisk_header *) buf;
|
|
|
|
if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
|
|
goto fail;
|
|
}
|
|
|
|
s->block_size = be32_to_cpu(dyndisk_header->block_size);
|
|
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->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;
|
|
}
|
|
|
|
s->free_data_block_offset =
|
|
(s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
qemu_co_mutex_init(&s->lock);
|
|
|
|
/* Disable migration when VHD images are used */
|
|
error_set(&s->migration_blocker,
|
|
QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
|
|
"vpc", bs->device_name, "live migration");
|
|
migrate_add_blocker(s->migration_blocker);
|
|
|
|
return 0;
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Returns the absolute byte offset of the given sector in the image file.
|
|
* If the sector is not allocated, -1 is returned instead.
|
|
*
|
|
* 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)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
uint64_t offset = sector_num * 512;
|
|
uint64_t bitmap_offset, block_offset;
|
|
uint32_t pagetable_index, pageentry_index;
|
|
|
|
pagetable_index = offset / s->block_size;
|
|
pageentry_index = (offset % s->block_size) / 512;
|
|
|
|
if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
|
|
return -1; // not allocated
|
|
|
|
bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
|
|
block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
|
|
|
|
// 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, 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]);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Writes the footer to the end of the image file. This is needed when the
|
|
* file grows as it overwrites the old footer
|
|
*
|
|
* Returns 0 on success and < 0 on error
|
|
*/
|
|
static int rewrite_footer(BlockDriverState* bs)
|
|
{
|
|
int ret;
|
|
BDRVVPCState *s = bs->opaque;
|
|
int64_t offset = s->free_data_block_offset;
|
|
|
|
ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocates a new block. This involves writing a new footer and updating
|
|
* the Block Allocation Table to use the space at the old end of the image
|
|
* file (overwriting the old footer)
|
|
*
|
|
* 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)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
int64_t bat_offset;
|
|
uint32_t index, bat_value;
|
|
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;
|
|
|
|
s->pagetable[index] = s->free_data_block_offset / 512;
|
|
|
|
// Initialize the block's bitmap
|
|
memset(bitmap, 0xff, s->bitmap_size);
|
|
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)
|
|
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
|
|
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);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
return get_sector_offset(bs, sector_num, 0);
|
|
|
|
fail:
|
|
s->free_data_block_offset -= (s->block_size + s->bitmap_size);
|
|
return -1;
|
|
}
|
|
|
|
static int vpc_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
int ret;
|
|
int64_t offset;
|
|
int64_t sectors, sectors_per_block;
|
|
struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
|
|
|
|
if (cpu_to_be32(footer->type) == VHD_FIXED) {
|
|
return bdrv_read(bs->file, sector_num, buf, nb_sectors);
|
|
}
|
|
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;
|
|
}
|
|
|
|
if (offset == -1) {
|
|
memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
|
|
} else {
|
|
ret = bdrv_pread(bs->file, offset, buf,
|
|
sectors * BDRV_SECTOR_SIZE);
|
|
if (ret != sectors * BDRV_SECTOR_SIZE) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
nb_sectors -= sectors;
|
|
sector_num += sectors;
|
|
buf += sectors * BDRV_SECTOR_SIZE;
|
|
}
|
|
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)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
int64_t offset;
|
|
int64_t sectors, sectors_per_block;
|
|
int ret;
|
|
struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
|
|
|
|
if (cpu_to_be32(footer->type) == VHD_FIXED) {
|
|
return bdrv_write(bs->file, sector_num, buf, nb_sectors);
|
|
}
|
|
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;
|
|
}
|
|
|
|
if (offset == -1) {
|
|
offset = alloc_block(bs, sector_num);
|
|
if (offset < 0)
|
|
return -1;
|
|
}
|
|
|
|
ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
|
|
if (ret != sectors * BDRV_SECTOR_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
nb_sectors -= sectors;
|
|
sector_num += sectors;
|
|
buf += sectors * BDRV_SECTOR_SIZE;
|
|
}
|
|
|
|
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);
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Calculates the number of cylinders, heads and sectors per cylinder
|
|
* based on a given number of sectors. This is the algorithm described
|
|
* in the VHD specification.
|
|
*
|
|
* 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
|
|
*/
|
|
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;
|
|
|
|
if (total_sectors > 65535 * 16 * 63) {
|
|
*secs_per_cyl = 255;
|
|
*heads = 16;
|
|
cyls_times_heads = total_sectors / *secs_per_cyl;
|
|
} else {
|
|
*secs_per_cyl = 17;
|
|
cyls_times_heads = total_sectors / *secs_per_cyl;
|
|
*heads = (cyls_times_heads + 1023) / 1024;
|
|
|
|
if (*heads < 4)
|
|
*heads = 4;
|
|
|
|
if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
|
|
*secs_per_cyl = 31;
|
|
*heads = 16;
|
|
cyls_times_heads = total_sectors / *secs_per_cyl;
|
|
}
|
|
|
|
if (cyls_times_heads >= (*heads * 1024)) {
|
|
*secs_per_cyl = 63;
|
|
*heads = 16;
|
|
cyls_times_heads = total_sectors / *secs_per_cyl;
|
|
}
|
|
}
|
|
|
|
*cyls = cyls_times_heads / *heads;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
size_t block_size, num_bat_entries;
|
|
int i;
|
|
int ret = -EIO;
|
|
|
|
// 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);
|
|
|
|
if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
|
goto fail;
|
|
}
|
|
|
|
if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) {
|
|
goto fail;
|
|
}
|
|
if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
|
goto fail;
|
|
}
|
|
|
|
// Write the initial BAT
|
|
if (lseek(fd, 3 * 512, SEEK_SET) < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
memset(buf, 0xFF, 512);
|
|
for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
|
|
if (write(fd, buf, 512) != 512) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// Prepare the Dynamic Disk Header
|
|
memset(buf, 0, 1024);
|
|
|
|
memcpy(dyndisk_header->magic, "cxsparse", 8);
|
|
|
|
/*
|
|
* 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 = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
|
|
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);
|
|
|
|
dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
|
|
|
|
// Write the header
|
|
if (lseek(fd, 512, SEEK_SET) < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
if (write(fd, buf, 1024) != 1024) {
|
|
goto fail;
|
|
}
|
|
ret = 0;
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size)
|
|
{
|
|
int ret = -EIO;
|
|
|
|
/* Add footer to total size */
|
|
total_size += 512;
|
|
if (ftruncate(fd, total_size) != 0) {
|
|
ret = -errno;
|
|
goto fail;
|
|
}
|
|
if (lseek(fd, -512, SEEK_END) < 0) {
|
|
goto fail;
|
|
}
|
|
if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int vpc_create(const char *filename, QEMUOptionParameter *options)
|
|
{
|
|
uint8_t buf[1024];
|
|
struct vhd_footer *footer = (struct vhd_footer *) buf;
|
|
QEMUOptionParameter *disk_type_param;
|
|
int fd, 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;
|
|
|
|
/* 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")) {
|
|
disk_type = VHD_DYNAMIC;
|
|
} else if (!strcmp(disk_type_param->value.s, "fixed")) {
|
|
disk_type = VHD_FIXED;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
disk_type = VHD_DYNAMIC;
|
|
}
|
|
|
|
/* Create the file */
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
|
if (fd < 0) {
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
total_sectors = total_size / BDRV_SECTOR_SIZE;
|
|
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;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
total_sectors = (int64_t) cyls * heads * secs_per_cyl;
|
|
|
|
/* Prepare the Hard Disk Footer */
|
|
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);
|
|
|
|
footer->features = be32_to_cpu(0x02);
|
|
footer->version = be32_to_cpu(0x00010000);
|
|
if (disk_type == VHD_DYNAMIC) {
|
|
footer->data_offset = be64_to_cpu(HEADER_SIZE);
|
|
} else {
|
|
footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
|
|
}
|
|
footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
|
|
|
|
/* Version of Virtual PC 2007 */
|
|
footer->major = be16_to_cpu(0x0005);
|
|
footer->minor = be16_to_cpu(0x0003);
|
|
if (disk_type == VHD_DYNAMIC) {
|
|
footer->orig_size = be64_to_cpu(total_sectors * 512);
|
|
footer->size = be64_to_cpu(total_sectors * 512);
|
|
} else {
|
|
footer->orig_size = be64_to_cpu(total_size);
|
|
footer->size = be64_to_cpu(total_size);
|
|
}
|
|
footer->cyls = be16_to_cpu(cyls);
|
|
footer->heads = heads;
|
|
footer->secs_per_cyl = secs_per_cyl;
|
|
|
|
footer->type = be32_to_cpu(disk_type);
|
|
|
|
/* TODO uuid is missing */
|
|
|
|
footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
|
|
|
|
if (disk_type == VHD_DYNAMIC) {
|
|
ret = create_dynamic_disk(fd, buf, total_sectors);
|
|
} else {
|
|
ret = create_fixed_disk(fd, buf, total_size);
|
|
}
|
|
|
|
fail:
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static void vpc_close(BlockDriverState *bs)
|
|
{
|
|
BDRVVPCState *s = bs->opaque;
|
|
g_free(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"
|
|
},
|
|
{
|
|
.name = BLOCK_OPT_SUBFMT,
|
|
.type = OPT_STRING,
|
|
.help =
|
|
"Type of virtual hard disk format. Supported formats are "
|
|
"{dynamic (default) | fixed} "
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
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_read = vpc_co_read,
|
|
.bdrv_write = vpc_co_write,
|
|
|
|
.create_options = vpc_create_options,
|
|
};
|
|
|
|
static void bdrv_vpc_init(void)
|
|
{
|
|
bdrv_register(&bdrv_vpc);
|
|
}
|
|
|
|
block_init(bdrv_vpc_init);
|