Request merging must not result in a huge request that exceeds the
maximum number of iovec elements. Use BlockLimits.max_iov instead of
hardcoding IOV_MAX.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
merge = 1;
}
- if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
+ if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 >
+ bs->bl.max_iov) {
merge = 0;
}
* 3. merge would exceed maximum transfer length of backend device
*/
if (sector_num + nb_sectors != req->sector_num ||
- niov > IOV_MAX - req->qiov.niov ||
+ niov > blk_get_max_iov(blk) - req->qiov.niov ||
req->qiov.size / BDRV_SECTOR_SIZE > max_xfer_len ||
nb_sectors > max_xfer_len - req->qiov.size / BDRV_SECTOR_SIZE) {
submit_requests(blk, mrb, start, num_reqs, niov);