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block/null-{co,aio}: Implement get_block_status() 

Signed-off-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-03-24 23:33:59 +01:00 committed by Kevin Wolf
parent cd219eb1e5
commit a90639270d
1 changed files with 22 additions and 0 deletions
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22
block/null.c
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@ -205,6 +205,24 @@ static int null_reopen_prepare(BDRVReopenState *reopen_state,
return 0;
}
static int64_t coroutine_fn null_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
BlockDriverState **file)
{
BDRVNullState *s = bs->opaque;
off_t start = sector_num * BDRV_SECTOR_SIZE;
*pnum = nb_sectors;
*file = bs;
if (s->read_zeroes) {
return BDRV_BLOCK_OFFSET_VALID | start | BDRV_BLOCK_ZERO;
} else {
return BDRV_BLOCK_OFFSET_VALID | start;
}
}
static BlockDriver bdrv_null_co = {
.format_name = "null-co",
.protocol_name = "null-co",
@ -218,6 +236,8 @@ static BlockDriver bdrv_null_co = {
.bdrv_co_writev = null_co_writev,
.bdrv_co_flush_to_disk = null_co_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
.bdrv_co_get_block_status = null_co_get_block_status,
};
static BlockDriver bdrv_null_aio = {
@ -233,6 +253,8 @@ static BlockDriver bdrv_null_aio = {
.bdrv_aio_writev = null_aio_writev,
.bdrv_aio_flush = null_aio_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
.bdrv_co_get_block_status = null_co_get_block_status,
};
static void bdrv_null_init(void)