Messages in this thread | | | Date | Mon, 4 Nov 2002 10:39:47 +0100 | From | Jens Axboe <> | Subject | Re: swsusp: don't eat ide disks |
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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
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