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SubjectRe: [PATCH] make nbd working in 2.5.x
Hi!

> we use nbd for our diskless systems, and it looks to me like that
> it has some serious problems in 2.5.x... Can you apply this patch
> and forward it to Linus?
>
> There were:
> * Missing disk's queue initialization
> * Driver should use list_del_init: put_request now verifies
> that req->queuelist is empty, and list_del was incompatible
> with this.
> * I converted nbd_end_request back to end_that_request_{first,last}
> as I saw no reason why driver should do it itself... and
> blk_put_request has no place under queue_lock, so apparently when
> semantic changed nobody went through drivers...

I do not think this is good idea. I am not sure who converted it to
bio, but he surely had good reason to do that.

> diff -urdN linux/drivers/block/nbd.c linux/drivers/block/nbd.c
> --- linux/drivers/block/nbd.c 2003-02-28 20:56:05.000000000 +0100
> +++ linux/drivers/block/nbd.c 2003-03-01 22:53:36.000000000 +0100
> @@ -76,22 +76,15 @@
> {
> int uptodate = (req->errors == 0) ? 1 : 0;
> request_queue_t *q = req->q;
> - struct bio *bio;
> - unsigned nsect;
> unsigned long flags;
>
> #ifdef PARANOIA
> requests_out++;
> #endif
> spin_lock_irqsave(q->queue_lock, flags);
> - while((bio = req->bio) != NULL) {
> - nsect = bio_sectors(bio);
> - blk_finished_io(nsect);
> - req->bio = bio->bi_next;
> - bio->bi_next = NULL;
> - bio_endio(bio, nsect << 9, uptodate ? 0 : -EIO);
> + if (!end_that_request_first(req, uptodate, req->nr_sectors)) {
> + end_that_request_last(req);
> }
> - blk_put_request(req);
> spin_unlock_irqrestore(q->queue_lock, flags);
> }
>

--
Horseback riding is like software...
...vgf orggre jura vgf serr.
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