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block: update request stacking methods to support discards

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Propagate REQ_DISCARD in cmd_flags when cloning a discard request.
Skip blk_rq_check_limits's existing checks for discard requests because
discard limits will have already been checked in blkdev_issue_discard.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
ike Snitzer 2010-08-08 12:11:33 -04:00 committed by Jens Axboe
parent 387ac08936
commit 3383977fad
1 changed files with 5 additions and 0 deletions
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5
block/blk-core.c
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@ -1644,6 +1644,9 @@ EXPORT_SYMBOL(submit_bio);
*/
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
if (rq->cmd_flags & REQ_DISCARD)
return 0;
if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
blk_rq_bytes(rq) > queue_max_hw_sectors(q) << 9) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
@ -2492,6 +2495,8 @@ static void __blk_rq_prep_clone(struct request *dst, struct request *src)
{
dst->cpu = src->cpu;
dst->cmd_flags = (rq_data_dir(src) | REQ_NOMERGE);
if (src->cmd_flags & REQ_DISCARD)
dst->cmd_flags |= REQ_DISCARD;
dst->cmd_type = src->cmd_type;
dst->__sector = blk_rq_pos(src);
dst->__data_len = blk_rq_bytes(src);