> allow_barrier(conf);
> + bio = bio_submit_split(bio, max_sectors, &conf->bio_split);
> wait_barrier(conf, false);
> +
> + if (!bio) {
> + set_bit(R10BIO_Returned, &r10_bio->state);
> + goto err_handle;
> + }
The NULL return should only happen for REQ_NOWAIT here, so maybe
give R10BIO_Returned a more descriptive name? Also please document
the flag in the header.
Any maybe yhe code wants a splitting helper instead of open coding
setting this flag in multiple places?
