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block/parallels: use buffer-based io 

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Vladimir Sementsov-Ogievskiy 2019-04-22 17:58:34 +03:00 committed by Kevin Wolf
parent 696e8cb292
commit a4072543cc
1 changed files with 6 additions and 8 deletions
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14
block/parallels.c
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@ -220,20 +220,18 @@ static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
if (bs->backing) {
int64_t nb_cow_sectors = to_allocate * s->tracks;
int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
QEMUIOVector qiov =
QEMU_IOVEC_INIT_BUF(qiov, qemu_blockalign(bs, nb_cow_bytes),
nb_cow_bytes);
void *buf = qemu_blockalign(bs, nb_cow_bytes);
ret = bdrv_co_preadv(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE,
nb_cow_bytes, &qiov, 0);
ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE,
nb_cow_bytes, buf, 0);
if (ret < 0) {
qemu_vfree(qemu_iovec_buf(&qiov));
qemu_vfree(buf);
return ret;
}
ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE,
nb_cow_bytes, &qiov, 0);
qemu_vfree(qemu_iovec_buf(&qiov));
nb_cow_bytes, buf, 0);
qemu_vfree(buf);
if (ret < 0) {
return ret;
}