diff options
| -rw-r--r-- | block/null.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/block/null.c b/block/null.c index 7646bb0e23..396500babd 100644 --- a/block/null.c +++ b/block/null.c @@ -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) |