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Diffstat (limited to 'block/vpc.c')
-rw-r--r--block/vpc.c146
1 files changed, 72 insertions, 74 deletions
diff --git a/block/vpc.c b/block/vpc.c
index 1ab55f9287..17a705b482 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -39,8 +39,6 @@
/**************************************************************/
-#define HEADER_SIZE 512
-
//#define CACHE
enum vhd_type {
@@ -95,8 +93,11 @@ typedef struct vhd_footer {
QemuUUID uuid;
uint8_t in_saved_state;
+ uint8_t reserved[427];
} QEMU_PACKED VHDFooter;
+QEMU_BUILD_BUG_ON(sizeof(VHDFooter) != 512);
+
typedef struct vhd_dyndisk_header {
char magic[8]; /* "cxsparse" */
@@ -127,11 +128,14 @@ typedef struct vhd_dyndisk_header {
uint32_t reserved;
uint64_t data_offset;
} parent_locator[8];
+ uint8_t reserved2[256];
} QEMU_PACKED VHDDynDiskHeader;
+QEMU_BUILD_BUG_ON(sizeof(VHDDynDiskHeader) != 1024);
+
typedef struct BDRVVPCState {
CoMutex lock;
- uint8_t footer_buf[HEADER_SIZE];
+ VHDFooter footer;
uint64_t free_data_block_offset;
int max_table_entries;
uint32_t *pagetable;
@@ -172,8 +176,9 @@ static QemuOptsList vpc_runtime_opts = {
static QemuOptsList vpc_create_opts;
-static uint32_t vpc_checksum(uint8_t *buf, size_t size)
+static uint32_t vpc_checksum(void *p, size_t size)
{
+ uint8_t *buf = p;
uint32_t res = 0;
int i;
@@ -216,11 +221,10 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
BDRVVPCState *s = bs->opaque;
int i;
VHDFooter *footer;
- VHDDynDiskHeader *dyndisk_header;
QemuOpts *opts = NULL;
Error *local_err = NULL;
bool use_chs;
- uint8_t buf[HEADER_SIZE];
+ VHDDynDiskHeader dyndisk_header;
uint32_t checksum;
uint64_t computed_size;
uint64_t pagetable_size;
@@ -247,28 +251,28 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
- ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE);
+ ret = bdrv_pread(bs->file, 0, &s->footer, sizeof(s->footer));
if (ret < 0) {
error_setg(errp, "Unable to read VHD header");
goto fail;
}
- footer = (VHDFooter *) s->footer_buf;
+ footer = &s->footer;
if (strncmp(footer->creator, "conectix", 8)) {
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) {
+ } else if (offset < sizeof(*footer)) {
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, offset-HEADER_SIZE, s->footer_buf,
- HEADER_SIZE);
+ ret = bdrv_pread(bs->file, offset - sizeof(*footer),
+ footer, sizeof(*footer));
if (ret < 0) {
goto fail;
}
@@ -282,7 +286,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
checksum = be32_to_cpu(footer->checksum);
footer->checksum = 0;
- if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) {
+ if (vpc_checksum(footer, sizeof(*footer)) != checksum) {
error_setg(errp, "Incorrect header checksum");
ret = -EINVAL;
goto fail;
@@ -340,22 +344,20 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
}
if (disk_type == VHD_DYNAMIC) {
- ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
- HEADER_SIZE);
+ ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset),
+ &dyndisk_header, sizeof(dyndisk_header));
if (ret < 0) {
error_setg(errp, "Error reading dynamic VHD header");
goto fail;
}
- dyndisk_header = (VHDDynDiskHeader *) buf;
-
- if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
+ if (strncmp(dyndisk_header.magic, "cxsparse", 8)) {
error_setg(errp, "Invalid header magic");
ret = -EINVAL;
goto fail;
}
- s->block_size = be32_to_cpu(dyndisk_header->block_size);
+ 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;
@@ -363,7 +365,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
}
s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
- s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
+ s->max_table_entries = be32_to_cpu(dyndisk_header.max_table_entries);
if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) {
error_setg(errp, "Too many blocks");
@@ -395,7 +397,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
- s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
+ s->bat_offset = be64_to_cpu(dyndisk_header.table_offset);
ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable,
pagetable_size);
@@ -534,7 +536,7 @@ static int rewrite_footer(BlockDriverState *bs)
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, offset, &s->footer, sizeof(s->footer));
if (ret < 0)
return ret;
@@ -597,9 +599,8 @@ fail:
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) {
+ if (be32_to_cpu(s->footer.type) != VHD_FIXED) {
bdi->cluster_size = s->block_size;
}
@@ -615,10 +616,9 @@ vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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) {
+ if (be32_to_cpu(s->footer.type) == VHD_FIXED) {
return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0);
}
@@ -666,10 +666,9 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
int64_t n_bytes;
int64_t bytes_done = 0;
int ret = 0;
- VHDFooter *footer = (VHDFooter *) s->footer_buf;
QEMUIOVector local_qiov;
- if (be32_to_cpu(footer->type) == VHD_FIXED) {
+ if (be32_to_cpu(s->footer.type) == VHD_FIXED) {
return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0);
}
@@ -723,13 +722,12 @@ static int coroutine_fn vpc_co_block_status(BlockDriverState *bs,
BlockDriverState **file)
{
BDRVVPCState *s = bs->opaque;
- VHDFooter *footer = (VHDFooter*) s->footer_buf;
int64_t image_offset;
bool allocated;
int ret;
int64_t n;
- if (be32_to_cpu(footer->type) == VHD_FIXED) {
+ if (be32_to_cpu(s->footer.type) == VHD_FIXED) {
*pnum = bytes;
*map = offset;
*file = bs->file->bs;
@@ -819,11 +817,11 @@ static int calculate_geometry(int64_t total_sectors, uint16_t *cyls,
return 0;
}
-static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf,
+static int create_dynamic_disk(BlockBackend *blk, VHDFooter *footer,
int64_t total_sectors)
{
- VHDDynDiskHeader *dyndisk_header =
- (VHDDynDiskHeader *) buf;
+ VHDDynDiskHeader dyndisk_header;
+ uint8_t bat_sector[512];
size_t block_size, num_bat_entries;
int i;
int ret;
@@ -833,13 +831,13 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf,
block_size = 0x200000;
num_bat_entries = DIV_ROUND_UP(total_sectors, block_size / 512);
- ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0);
+ ret = blk_pwrite(blk, offset, footer, sizeof(*footer), 0);
if (ret < 0) {
goto fail;
}
offset = 1536 + ((num_bat_entries * 4 + 511) & ~511);
- ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0);
+ ret = blk_pwrite(blk, offset, footer, sizeof(*footer), 0);
if (ret < 0) {
goto fail;
}
@@ -847,9 +845,9 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf,
/* Write the initial BAT */
offset = 3 * 512;
- memset(buf, 0xFF, 512);
+ memset(bat_sector, 0xFF, 512);
for (i = 0; i < DIV_ROUND_UP(num_bat_entries * 4, 512); i++) {
- ret = blk_pwrite(blk, offset, buf, 512, 0);
+ ret = blk_pwrite(blk, offset, bat_sector, 512, 0);
if (ret < 0) {
goto fail;
}
@@ -857,26 +855,27 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf,
}
/* Prepare the Dynamic Disk Header */
- memset(buf, 0, 1024);
+ memset(&dyndisk_header, 0, sizeof(dyndisk_header));
- memcpy(dyndisk_header->magic, "cxsparse", 8);
+ 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 = 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);
+ 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);
- dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024));
+ dyndisk_header.checksum = cpu_to_be32(
+ vpc_checksum(&dyndisk_header, sizeof(dyndisk_header)));
/* Write the header */
offset = 512;
- ret = blk_pwrite(blk, offset, buf, 1024, 0);
+ ret = blk_pwrite(blk, offset, &dyndisk_header, sizeof(dyndisk_header), 0);
if (ret < 0) {
goto fail;
}
@@ -886,20 +885,21 @@ static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf,
return ret;
}
-static int create_fixed_disk(BlockBackend *blk, uint8_t *buf,
+static int create_fixed_disk(BlockBackend *blk, VHDFooter *footer,
int64_t total_size, Error **errp)
{
int ret;
/* Add footer to total size */
- total_size += HEADER_SIZE;
+ total_size += sizeof(*footer);
ret = blk_truncate(blk, total_size, false, PREALLOC_MODE_OFF, 0, errp);
if (ret < 0) {
return ret;
}
- ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE, 0);
+ ret = blk_pwrite(blk, total_size - sizeof(*footer),
+ footer, sizeof(*footer), 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Unable to write VHD header");
return ret;
@@ -971,8 +971,7 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
- uint8_t buf[1024];
- VHDFooter *footer = (VHDFooter *) buf;
+ VHDFooter footer;
uint16_t cyls = 0;
uint8_t heads = 0;
uint8_t secs_per_cyl = 0;
@@ -1035,48 +1034,48 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
}
/* Prepare the Hard Disk Footer */
- memset(buf, 0, 1024);
+ memset(&footer, 0, sizeof(footer));
- memcpy(footer->creator, "conectix", 8);
+ memcpy(footer.creator, "conectix", 8);
if (vpc_opts->force_size) {
- memcpy(footer->creator_app, "qem2", 4);
+ memcpy(footer.creator_app, "qem2", 4);
} else {
- memcpy(footer->creator_app, "qemu", 4);
+ memcpy(footer.creator_app, "qemu", 4);
}
- memcpy(footer->creator_os, "Wi2k", 4);
+ memcpy(footer.creator_os, "Wi2k", 4);
- footer->features = cpu_to_be32(0x02);
- footer->version = cpu_to_be32(0x00010000);
+ 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);
+ footer.data_offset = cpu_to_be64(sizeof(footer));
} else {
- footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL);
+ footer.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL);
}
- footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE);
+ 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;
+ 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;
- footer->type = cpu_to_be32(disk_type);
+ footer.type = cpu_to_be32(disk_type);
qemu_uuid_generate(&uuid);
- footer->uuid = uuid;
+ footer.uuid = uuid;
- footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));
+ footer.checksum = cpu_to_be32(vpc_checksum(&footer, sizeof(footer)));
if (disk_type == VHD_DYNAMIC) {
- ret = create_dynamic_disk(blk, buf, total_sectors);
+ ret = create_dynamic_disk(blk, &footer, total_sectors);
if (ret < 0) {
error_setg(errp, "Unable to create or write VHD header");
}
} else {
- ret = create_fixed_disk(blk, buf, total_size, errp);
+ ret = create_fixed_disk(blk, &footer, total_size, errp);
}
out:
@@ -1170,9 +1169,8 @@ fail:
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) {
+ if (be32_to_cpu(s->footer.type) == VHD_FIXED) {
return bdrv_has_zero_init(bs->file->bs);
} else {
return 1;
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-02 07:11:45 +0000