diff options
| -rw-r--r-- | block.c | 30 | ||||
| -rw-r--r-- | include/block/block.h | 2 |
2 files changed, 32 insertions, 0 deletions
@@ -3103,6 +3103,36 @@ int bdrv_has_zero_init(BlockDriverState *bs) return 0; } +bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) +{ + BlockDriverInfo bdi; + + if (bs->backing_hd) { + return false; + } + + if (bdrv_get_info(bs, &bdi) == 0) { + return bdi.unallocated_blocks_are_zero; + } + + return false; +} + +bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) +{ + BlockDriverInfo bdi; + + if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { + return false; + } + + if (bdrv_get_info(bs, &bdi) == 0) { + return bdi.can_write_zeroes_with_unmap; + } + + return false; +} + typedef struct BdrvCoGetBlockStatusData { BlockDriverState *bs; BlockDriverState *base; diff --git a/include/block/block.h b/include/block/block.h index 9c76967104..803c5caceb 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -344,6 +344,8 @@ int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); int bdrv_has_zero_init_1(BlockDriverState *bs); int bdrv_has_zero_init(BlockDriverState *bs); +bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); +bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum); int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |