diff options
author | Kent Overstreet <kent.overstreet@gmail.com> | 2015-04-28 09:48:34 +0300 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-08-13 21:31:57 +0300 |
commit | 8ae126660fddbeebb9251a174e6fa45b6ad8f932 (patch) | |
tree | fe471f94c8686b59f7a07b5b4f59ee4f51254902 /drivers/block | |
parent | 7140aafce2fc14c5af02fdb7859b6bea0108be3d (diff) | |
download | linux-8ae126660fddbeebb9251a174e6fa45b6ad8f932.tar.xz |
block: kill merge_bvec_fn() completely
As generic_make_request() is now able to handle arbitrarily sized bios,
it's no longer necessary for each individual block driver to define its
own ->merge_bvec_fn() callback. Remove every invocation completely.
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Lars Ellenberg <drbd-dev@lists.linbit.com>
Cc: drbd-user@lists.linbit.com
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Yehuda Sadeh <yehuda@inktank.com>
Cc: Sage Weil <sage@inktank.com>
Cc: Alex Elder <elder@kernel.org>
Cc: ceph-devel@vger.kernel.org
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com
Cc: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: NeilBrown <neilb@suse.de> (for the 'md' bits)
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
[dpark: also remove ->merge_bvec_fn() in dm-thin as well as
dm-era-target, and resolve merge conflicts]
Signed-off-by: Dongsu Park <dpark@posteo.net>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block')
-rw-r--r-- | drivers/block/drbd/drbd_int.h | 1 | ||||
-rw-r--r-- | drivers/block/drbd/drbd_main.c | 1 | ||||
-rw-r--r-- | drivers/block/drbd/drbd_req.c | 35 | ||||
-rw-r--r-- | drivers/block/pktcdvd.c | 21 | ||||
-rw-r--r-- | drivers/block/rbd.c | 47 |
5 files changed, 0 insertions, 105 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index a08c4a9179f1..015c6e91b756 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1450,7 +1450,6 @@ extern void do_submit(struct work_struct *ws); extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long); extern void drbd_make_request(struct request_queue *q, struct bio *bio); extern int drbd_read_remote(struct drbd_device *device, struct drbd_request *req); -extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec); extern int is_valid_ar_handle(struct drbd_request *, sector_t); diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index a1518539b858..74d97f4bac34 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2774,7 +2774,6 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig This triggers a max_bio_size message upon first attach or connect */ blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8); blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); - blk_queue_merge_bvec(q, drbd_merge_bvec); q->queue_lock = &resource->req_lock; device->md_io.page = alloc_page(GFP_KERNEL); diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 923c857b395b..211592682169 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1512,41 +1512,6 @@ void drbd_make_request(struct request_queue *q, struct bio *bio) __drbd_make_request(device, bio, start_jif); } -/* This is called by bio_add_page(). - * - * q->max_hw_sectors and other global limits are already enforced there. - * - * We need to call down to our lower level device, - * in case it has special restrictions. - * - * We also may need to enforce configured max-bio-bvecs limits. - * - * As long as the BIO is empty we have to allow at least one bvec, - * regardless of size and offset, so no need to ask lower levels. - */ -int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec) -{ - struct drbd_device *device = (struct drbd_device *) q->queuedata; - unsigned int bio_size = bvm->bi_size; - int limit = DRBD_MAX_BIO_SIZE; - int backing_limit; - - if (bio_size && get_ldev(device)) { - unsigned int max_hw_sectors = queue_max_hw_sectors(q); - struct request_queue * const b = - device->ldev->backing_bdev->bd_disk->queue; - if (b->merge_bvec_fn) { - bvm->bi_bdev = device->ldev->backing_bdev; - backing_limit = b->merge_bvec_fn(b, bvm, bvec); - limit = min(limit, backing_limit); - } - put_ldev(device); - if ((limit >> 9) > max_hw_sectors) - limit = max_hw_sectors << 9; - } - return limit; -} - void request_timer_fn(unsigned long data) { struct drbd_device *device = (struct drbd_device *) data; diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index ee7ad5e44632..7be2375db7f2 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2506,26 +2506,6 @@ end_io: -static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, - struct bio_vec *bvec) -{ - struct pktcdvd_device *pd = q->queuedata; - sector_t zone = get_zone(bmd->bi_sector, pd); - int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; - int remaining = (pd->settings.size << 9) - used; - int remaining2; - - /* - * A bio <= PAGE_SIZE must be allowed. If it crosses a packet - * boundary, pkt_make_request() will split the bio. - */ - remaining2 = PAGE_SIZE - bmd->bi_size; - remaining = max(remaining, remaining2); - - BUG_ON(remaining < 0); - return remaining; -} - static void pkt_init_queue(struct pktcdvd_device *pd) { struct request_queue *q = pd->disk->queue; @@ -2533,7 +2513,6 @@ static void pkt_init_queue(struct pktcdvd_device *pd) blk_queue_make_request(q, pkt_make_request); blk_queue_logical_block_size(q, CD_FRAMESIZE); blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); - blk_queue_merge_bvec(q, pkt_merge_bvec); q->queuedata = pd; } diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index dcc86937f55c..71dd061a7e11 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3462,52 +3462,6 @@ static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx, return BLK_MQ_RQ_QUEUE_OK; } -/* - * a queue callback. Makes sure that we don't create a bio that spans across - * multiple osd objects. One exception would be with a single page bios, - * which we handle later at bio_chain_clone_range() - */ -static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, - struct bio_vec *bvec) -{ - struct rbd_device *rbd_dev = q->queuedata; - sector_t sector_offset; - sector_t sectors_per_obj; - sector_t obj_sector_offset; - int ret; - - /* - * Find how far into its rbd object the partition-relative - * bio start sector is to offset relative to the enclosing - * device. - */ - sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; - sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); - obj_sector_offset = sector_offset & (sectors_per_obj - 1); - - /* - * Compute the number of bytes from that offset to the end - * of the object. Account for what's already used by the bio. - */ - ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; - if (ret > bmd->bi_size) - ret -= bmd->bi_size; - else - ret = 0; - - /* - * Don't send back more than was asked for. And if the bio - * was empty, let the whole thing through because: "Note - * that a block device *must* allow a single page to be - * added to an empty bio." - */ - rbd_assert(bvec->bv_len <= PAGE_SIZE); - if (ret > (int) bvec->bv_len || !bmd->bi_size) - ret = (int) bvec->bv_len; - - return ret; -} - static void rbd_free_disk(struct rbd_device *rbd_dev) { struct gendisk *disk = rbd_dev->disk; @@ -3806,7 +3760,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev) blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); q->limits.discard_zeroes_data = 1; - blk_queue_merge_bvec(q, rbd_merge_bvec); disk->queue = q; q->queuedata = rbd_dev; |