Re: swsusp: don't eat ide disks

[Jens Axboe]

On Sun, Nov 03 2002, Linus Torvalds wrote:
> 	struct request *rq;
> 
> 	rq = blk_get_request(q, WRITE, __GFP_WAIT);
> 	rq->flags = REQ_BLOCK_PC;
> 	rq->data = NULL;
> 	rq->data_len = 0;
> 	rq->timeout = 5*HZ; /* Or whatever */
> 	memset(rq->cmd, 0, sizeof(rq->cmd));
> 	rq->cmd[0] = SYNCHRONIZE_CACHE;
> 	.. fill in whatever bytes the SYNCHRONIZE_CACHE cmd needs ..
> 	rq->cmd_len = 10;
> 	err = blk_do_rq(q, bdev, rq);
> 	blk_put_request(rq);

Warning, redundant blk_put_request().

I agree with Linus' example though. The queue is nice that way, for
completely synchronizing access to the device.

> and you're done. The above should work pretty much on all block drivers
> out there, btw: the ones that don't understand SCSI commands should just
> ignore requests that aren't the regular REQ_CMD commands.

Except ide drives?

-- 
Jens Axboe