From ff36ab34583ae23250a4bf39805d69771e7e0131 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Mon, 23 Feb 2015 17:56:37 -0500 Subject: dm: remove request-based logic from make_request_fn wrapper The old dm_request() method used for q->make_request_fn had a branch for request-based DM support but it isn't needed given that dm_init_request_based_queue() sets it to the standard blk_queue_bio() anyway. Cleanup dm_init_md_queue() to be DM device-type agnostic and have dm_setup_md_queue() properly finish queue setup based on DM device-type (bio-based vs request-based). A followup block patch can be made to remove the export for blk_queue_bio() now that DM no longer calls it directly. Signed-off-by: Mike Snitzer --- drivers/md/dm.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/dm.c b/drivers/md/dm.c index cc8aed2e3f88..43e0d1a85a60 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1693,7 +1693,7 @@ out: * The request function that just remaps the bio built up by * dm_merge_bvec. */ -static void _dm_request(struct request_queue *q, struct bio *bio) +static void dm_make_request(struct request_queue *q, struct bio *bio) { int rw = bio_data_dir(bio); struct mapped_device *md = q->queuedata; @@ -1725,16 +1725,6 @@ int dm_request_based(struct mapped_device *md) return blk_queue_stackable(md->queue); } -static void dm_request(struct request_queue *q, struct bio *bio) -{ - struct mapped_device *md = q->queuedata; - - if (dm_request_based(md)) - blk_queue_bio(q, bio); - else - _dm_request(q, bio); -} - static void dm_dispatch_clone_request(struct request *clone, struct request *rq) { int r; @@ -2100,9 +2090,8 @@ static void dm_init_md_queue(struct mapped_device *md) md->queue->queuedata = md; md->queue->backing_dev_info.congested_fn = dm_any_congested; md->queue->backing_dev_info.congested_data = md; - blk_queue_make_request(md->queue, dm_request); + blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY); - blk_queue_merge_bvec(md->queue, dm_merge_bvec); } /* @@ -2335,7 +2324,7 @@ int dm_queue_merge_is_compulsory(struct request_queue *q) if (!q->merge_bvec_fn) return 0; - if (q->make_request_fn == dm_request) { + if (q->make_request_fn == dm_make_request) { dev_md = q->queuedata; if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags)) return 0; @@ -2545,9 +2534,15 @@ static int dm_init_request_based_queue(struct mapped_device *md) */ int dm_setup_md_queue(struct mapped_device *md) { - if (dm_md_type_request_based(md) && !dm_init_request_based_queue(md)) { - DMWARN("Cannot initialize queue for request-based mapped device"); - return -EINVAL; + if (dm_md_type_request_based(md)) { + if (!dm_init_request_based_queue(md)) { + DMWARN("Cannot initialize queue for request-based mapped device"); + return -EINVAL; + } + } else { + /* bio-based specific initialization */ + blk_queue_make_request(md->queue, dm_make_request); + blk_queue_merge_bvec(md->queue, dm_merge_bvec); } return 0; -- cgit v1.2.3