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block/vpc: Use sizeof() instead of HEADER_SIZE for footer size 

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201217162003.1102738-10-armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2020-12-17 17:20:03 +01:00 committed by Kevin Wolf
parent a3d2761719
commit be7c5ddd0d
1 changed files with 14 additions and 15 deletions
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29
block/vpc.c
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@ -39,8 +39,6 @@
/**************************************************************/
#define HEADER_SIZE 512
//#define CACHE
enum vhd_type {
@ -253,7 +251,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
ret = bdrv_pread(bs->file, 0, &s->footer, 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;
@ -266,15 +264,15 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
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, footer,
HEADER_SIZE);
ret = bdrv_pread(bs->file, offset - sizeof(*footer),
footer, sizeof(*footer));
if (ret < 0) {
goto fail;
}
@ -288,7 +286,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
checksum = be32_to_cpu(footer->checksum);
footer->checksum = 0;
if (vpc_checksum(footer, HEADER_SIZE) != checksum) {
if (vpc_checksum(footer, sizeof(*footer)) != checksum) {
error_setg(errp, "Incorrect header checksum");
ret = -EINVAL;
goto fail;
@ -538,7 +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, HEADER_SIZE);
ret = bdrv_pwrite_sync(bs->file, offset, &s->footer, sizeof(s->footer));
if (ret < 0)
return ret;
@ -833,13 +831,13 @@ static int create_dynamic_disk(BlockBackend *blk, VHDFooter *footer,
block_size = 0x200000;
num_bat_entries = DIV_ROUND_UP(total_sectors, block_size / 512);
ret = blk_pwrite(blk, offset, footer, 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, footer, HEADER_SIZE, 0);
ret = blk_pwrite(blk, offset, footer, sizeof(*footer), 0);
if (ret < 0) {
goto fail;
}
@ -893,14 +891,15 @@ static int create_fixed_disk(BlockBackend *blk, VHDFooter *footer,
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, footer, 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;
@ -1035,7 +1034,7 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
}
/* Prepare the Hard Disk Footer */
memset(&footer, 0, HEADER_SIZE);
memset(&footer, 0, sizeof(footer));
memcpy(footer.creator, "conectix", 8);
if (vpc_opts->force_size) {
@ -1048,7 +1047,7 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
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);
}
@ -1068,7 +1067,7 @@ static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
qemu_uuid_generate(&uuid);
footer.uuid = uuid;
footer.checksum = cpu_to_be32(vpc_checksum(&footer, HEADER_SIZE));
footer.checksum = cpu_to_be32(vpc_checksum(&footer, sizeof(footer)));
if (disk_type == VHD_DYNAMIC) {
ret = create_dynamic_disk(blk, &footer, total_sectors);