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authorKent Overstreet <kent.overstreet@gmail.com>2015-04-28 09:48:34 +0300
committerJens Axboe <axboe@fb.com>2015-08-13 21:31:57 +0300
commit8ae126660fddbeebb9251a174e6fa45b6ad8f932 (patch)
treefe471f94c8686b59f7a07b5b4f59ee4f51254902 /drivers/block
parent7140aafce2fc14c5af02fdb7859b6bea0108be3d (diff)
downloadlinux-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.h1
-rw-r--r--drivers/block/drbd/drbd_main.c1
-rw-r--r--drivers/block/drbd/drbd_req.c35
-rw-r--r--drivers/block/pktcdvd.c21
-rw-r--r--drivers/block/rbd.c47
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;