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block/vmdk: add basic .bdrv_check support 

this adds a basic vmdk corruption check. it should detect severe
table corruptions and file truncation.

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2014-01-29 09:34:16 +01:00 committed by Stefan Hajnoczi
parent 14b4a8b9c6
commit f43aa8e18a
1 changed files with 48 additions and 0 deletions
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48
block/vmdk.c
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@ -1942,6 +1942,53 @@ static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
return info;
}
static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result,
BdrvCheckMode fix)
{
BDRVVmdkState *s = bs->opaque;
VmdkExtent *extent = NULL;
int64_t sector_num = 0;
int64_t total_sectors = bdrv_getlength(bs) / BDRV_SECTOR_SIZE;
int ret;
uint64_t cluster_offset;
if (fix) {
return -ENOTSUP;
}
for (;;) {
if (sector_num >= total_sectors) {
return 0;
}
extent = find_extent(s, sector_num, extent);
if (!extent) {
fprintf(stderr,
"ERROR: could not find extent for sector %" PRId64 "\n",
sector_num);
break;
}
ret = get_cluster_offset(bs, extent, NULL,
sector_num << BDRV_SECTOR_BITS,
0, &cluster_offset);
if (ret == VMDK_ERROR) {
fprintf(stderr,
"ERROR: could not get cluster_offset for sector %"
PRId64 "\n", sector_num);
break;
}
if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) {
fprintf(stderr,
"ERROR: cluster offset for sector %"
PRId64 " points after EOF\n", sector_num);
break;
}
sector_num += extent->cluster_sectors;
}
result->corruptions++;
return 0;
}
static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
{
int i;
@ -2015,6 +2062,7 @@ static BlockDriver bdrv_vmdk = {
.instance_size = sizeof(BDRVVmdkState),
.bdrv_probe = vmdk_probe,
.bdrv_open = vmdk_open,
.bdrv_check = vmdk_check,
.bdrv_reopen_prepare = vmdk_reopen_prepare,
.bdrv_read = vmdk_co_read,
.bdrv_write = vmdk_co_write,