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vpc: Implement .bdrv_has_zero_init 

Depending on the subformat, has_zero_init on VHD must behave like raw
and query the underlying storage (fixed) or like other sparse formats
that can always return 1 (dynamic, differencing).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2013-06-28 10:21:00 +02:00
parent 8ed610a1c9
commit 72c6cc94da
1 changed files with 19 additions and 6 deletions
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25
block/vpc.c
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@ -786,6 +786,18 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
return ret;
}
static int vpc_has_zero_init(BlockDriverState *bs)
{
BDRVVPCState *s = bs->opaque;
struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
if (cpu_to_be32(footer->type) == VHD_FIXED) {
return bdrv_has_zero_init(bs->file);
} else {
return 1;
}
}
static void vpc_close(BlockDriverState *bs)
{
BDRVVPCState *s = bs->opaque;
@ -818,16 +830,17 @@ static BlockDriver bdrv_vpc = {
.format_name = "vpc",
.instance_size = sizeof(BDRVVPCState),
.bdrv_probe = vpc_probe,
.bdrv_open = vpc_open,
.bdrv_close = vpc_close,
.bdrv_reopen_prepare = vpc_reopen_prepare,
.bdrv_create = vpc_create,
.bdrv_probe = vpc_probe,
.bdrv_open = vpc_open,
.bdrv_close = vpc_close,
.bdrv_reopen_prepare = vpc_reopen_prepare,
.bdrv_create = vpc_create,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
.create_options = vpc_create_options,
.create_options = vpc_create_options,
.bdrv_has_zero_init = vpc_has_zero_init,
};
static void bdrv_vpc_init(void)