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| author | ike Snitzer <snitzer@redhat.com> | 2010-08-08 12:11:33 -0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-08 12:11:33 -0400 |
| commit | 3383977fadc4027f20907f6208a9033cd043adab (patch) | |
| tree | 4c950e22a7db4c2f0d5a65462b3f9081f4f6132e /block/blk-core.c | |
| parent | 387ac089361fbe5ef287e6950c5c40f6b18e5c55 (diff) | |
| download | lwn-3383977fadc4027f20907f6208a9033cd043adab.tar.gz lwn-3383977fadc4027f20907f6208a9033cd043adab.zip | |
block: update request stacking methods to support discards
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>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 5ab3ac22930c..7da630e25ae7 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -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); |