Commit a4072543 authored by Vladimir Sementsov-Ogievskiy's avatar Vladimir Sementsov-Ogievskiy Committed by Kevin Wolf
Browse files

block/parallels: use buffer-based io 



Signed-off-by: default avatarVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 696e8cb2

block/parallels.c

+6 −8
Original line number Diff line number Diff line
@@ -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;

        }