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block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO 

Alternatively, this could use a "discard zeroes data" flag returned
by bdrv_get_info.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-04 19:00:31 +02:00 committed by Stefan Hajnoczi
parent 4bc74be997
commit 415b5b013c
1 changed files with 10 additions and 1 deletions
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11
block.c
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@ -3075,6 +3075,7 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
{
int64_t length;
int64_t n;
int64_t ret;
length = bdrv_getlength(bs);
if (length < 0) {
@ -3096,7 +3097,15 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
return BDRV_BLOCK_DATA;
}
return bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
if (ret < 0) {
return ret;
}
if (!(ret & BDRV_BLOCK_DATA) && bdrv_has_zero_init(bs)) {
ret |= BDRV_BLOCK_ZERO;
}
return ret;
}
/* Coroutine wrapper for bdrv_get_block_status() */