diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index cc59efc184..5e26c3d5b7 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2421,38 +2421,39 @@ static bool is_zero_sectors(BlockDriverState *bs, int64_t start, return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == count; } -static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, - int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) +static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, + int64_t offset, int count, BdrvRequestFlags flags) { int ret; BDRVQcow2State *s = bs->opaque; - uint32_t head = sector_num % s->cluster_sectors; - uint32_t tail = (sector_num + nb_sectors) % s->cluster_sectors; + uint32_t head = offset % s->cluster_size; + uint32_t tail = (offset + count) % s->cluster_size; - trace_qcow2_write_zeroes_start_req(qemu_coroutine_self(), sector_num, - nb_sectors); + trace_qcow2_pwrite_zeroes_start_req(qemu_coroutine_self(), offset, count); if (head || tail) { - int64_t cl_start = sector_num - head; + int64_t cl_start = (offset - head) >> BDRV_SECTOR_BITS; uint64_t off; int nr; - assert(cl_start + s->cluster_sectors >= sector_num + nb_sectors); + assert(head + count <= s->cluster_size); /* check whether remainder of cluster already reads as zero */ - if (!(is_zero_sectors(bs, cl_start, head) && - is_zero_sectors(bs, sector_num + nb_sectors, - -tail & (s->cluster_sectors - 1)))) { + if (!(is_zero_sectors(bs, cl_start, + DIV_ROUND_UP(head, BDRV_SECTOR_SIZE)) && + is_zero_sectors(bs, (offset + count) >> BDRV_SECTOR_BITS, + DIV_ROUND_UP(-tail & (s->cluster_size - 1), + BDRV_SECTOR_SIZE)))) { return -ENOTSUP; } qemu_co_mutex_lock(&s->lock); /* We can have new write after previous check */ - sector_num = cl_start; - nb_sectors = nr = s->cluster_sectors; - ret = qcow2_get_cluster_offset(bs, cl_start << BDRV_SECTOR_BITS, - &nr, &off); + offset = cl_start << BDRV_SECTOR_BITS; + count = s->cluster_size; + nr = s->cluster_sectors; + ret = qcow2_get_cluster_offset(bs, offset, &nr, &off); if (ret != QCOW2_CLUSTER_UNALLOCATED && ret != QCOW2_CLUSTER_ZERO) { qemu_co_mutex_unlock(&s->lock); return -ENOTSUP; @@ -2461,10 +2462,10 @@ static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, qemu_co_mutex_lock(&s->lock); } - trace_qcow2_write_zeroes(qemu_coroutine_self(), sector_num, nb_sectors); + trace_qcow2_pwrite_zeroes(qemu_coroutine_self(), offset, count); /* Whatever is left can use real zero clusters */ - ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, nb_sectors); + ret = qcow2_zero_clusters(bs, offset, count >> BDRV_SECTOR_BITS); qemu_co_mutex_unlock(&s->lock); return ret; @@ -3371,7 +3372,7 @@ BlockDriver bdrv_qcow2 = { .bdrv_co_writev = qcow2_co_writev, .bdrv_co_flush_to_os = qcow2_co_flush_to_os, - .bdrv_co_write_zeroes = qcow2_co_write_zeroes, + .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes, .bdrv_co_discard = qcow2_co_discard, .bdrv_truncate = qcow2_truncate, .bdrv_write_compressed = qcow2_write_compressed, |