We are gradually moving away from sector-based interfaces, towards byte-based. Update the qcow2 driver accordingly.
For now, we are ignoring the 'mapping' hint. However, it should be relatively straightforward to honor the hint as a way to return larger *pnum values when we have consecutive clusters with the same data/zero status but which differ only in having non-consecutive mappings. Signed-off-by: Eric Blake <ebl...@redhat.com> --- v2: rebase to mapping flag --- block/qcow2.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 721cb077fe..de5f737681 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1624,8 +1624,12 @@ static void qcow2_join_options(QDict *options, QDict *old_options) } } -static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs, - int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) +static int64_t coroutine_fn qcow2_co_block_status(BlockDriverState *bs, + bool mapping, + int64_t offset, + int64_t count, + int64_t *pnum, + BlockDriverState **file) { BDRVQcow2State *s = bs->opaque; uint64_t cluster_offset; @@ -1633,21 +1637,20 @@ static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs, unsigned int bytes; int64_t status = 0; - bytes = MIN(INT_MAX, nb_sectors * BDRV_SECTOR_SIZE); + bytes = MIN(INT_MAX, count); qemu_co_mutex_lock(&s->lock); - ret = qcow2_get_cluster_offset(bs, sector_num << 9, &bytes, - &cluster_offset); + ret = qcow2_get_cluster_offset(bs, offset, &bytes, &cluster_offset); qemu_co_mutex_unlock(&s->lock); if (ret < 0) { return ret; } - *pnum = bytes >> BDRV_SECTOR_BITS; + *pnum = bytes; if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && !s->crypto) { - index_in_cluster = sector_num & (s->cluster_sectors - 1); - cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); + index_in_cluster = offset & (s->cluster_size - 1); + cluster_offset |= (index_in_cluster & BDRV_BLOCK_OFFSET_MASK); *file = bs->file->bs; status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset; } @@ -4259,7 +4262,7 @@ BlockDriver bdrv_qcow2 = { .bdrv_child_perm = bdrv_format_default_perms, .bdrv_create = qcow2_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, - .bdrv_co_get_block_status = qcow2_co_get_block_status, + .bdrv_co_block_status = qcow2_co_block_status, .bdrv_co_preadv = qcow2_co_preadv, .bdrv_co_pwritev = qcow2_co_pwritev, -- 2.13.5