From 4246a0b63bd8f56a1469b12eafeb875b1041a451 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 20 Jul 2015 15:29:37 +0200 Subject: block: add a bi_error field to struct bio Currently we have two different ways to signal an I/O error on a BIO: (1) by clearing the BIO_UPTODATE flag (2) by returning a Linux errno value to the bi_end_io callback The first one has the drawback of only communicating a single possible error (-EIO), and the second one has the drawback of not beeing persistent when bios are queued up, and are not passed along from child to parent bio in the ever more popular chaining scenario. Having both mechanisms available has the additional drawback of utterly confusing driver authors and introducing bugs where various I/O submitters only deal with one of them, and the others have to add boilerplate code to deal with both kinds of error returns. So add a new bi_error field to store an errno value directly in struct bio and remove the existing mechanisms to clean all this up. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: NeilBrown Signed-off-by: Jens Axboe --- drivers/md/raid0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/md/raid0.c') diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index efb654eb5399..e6e0ae56f66b 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -543,7 +543,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio) if (unlikely((split->bi_rw & REQ_DISCARD) && !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) { /* Just ignore it */ - bio_endio(split, 0); + bio_endio(split); } else generic_make_request(split); } while (split != bio); -- cgit v1.2.3-70-g09d2 From 8ae126660fddbeebb9251a174e6fa45b6ad8f932 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Mon, 27 Apr 2015 23:48:34 -0700 Subject: 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 Cc: Lars Ellenberg Cc: drbd-user@lists.linbit.com Cc: Jiri Kosina Cc: Yehuda Sadeh Cc: Sage Weil Cc: Alex Elder Cc: ceph-devel@vger.kernel.org Cc: Alasdair Kergon Cc: Mike Snitzer Cc: dm-devel@redhat.com Cc: Neil Brown Cc: linux-raid@vger.kernel.org Cc: Christoph Hellwig Cc: "Martin K. Petersen" Acked-by: NeilBrown (for the 'md' bits) Acked-by: Mike Snitzer Signed-off-by: Kent Overstreet [dpark: also remove ->merge_bvec_fn() in dm-thin as well as dm-era-target, and resolve merge conflicts] Signed-off-by: Dongsu Park Signed-off-by: Ming Lin Signed-off-by: Jens Axboe --- block/blk-merge.c | 17 +----- block/blk-settings.c | 22 ------- drivers/block/drbd/drbd_int.h | 1 - drivers/block/drbd/drbd_main.c | 1 - drivers/block/drbd/drbd_req.c | 35 ------------ drivers/block/pktcdvd.c | 21 ------- drivers/block/rbd.c | 47 --------------- drivers/md/dm-cache-target.c | 21 ------- drivers/md/dm-crypt.c | 16 ------ drivers/md/dm-era-target.c | 15 ----- drivers/md/dm-flakey.c | 16 ------ drivers/md/dm-linear.c | 16 ------ drivers/md/dm-log-writes.c | 16 ------ drivers/md/dm-raid.c | 19 ------ drivers/md/dm-snap.c | 15 ----- drivers/md/dm-stripe.c | 21 ------- drivers/md/dm-table.c | 8 --- drivers/md/dm-thin.c | 31 ---------- drivers/md/dm-verity.c | 16 ------ drivers/md/dm.c | 127 +---------------------------------------- drivers/md/dm.h | 2 - drivers/md/linear.c | 43 -------------- drivers/md/md.c | 26 --------- drivers/md/md.h | 12 ---- drivers/md/multipath.c | 21 ------- drivers/md/raid0.c | 56 ------------------ drivers/md/raid0.h | 2 - drivers/md/raid1.c | 58 +------------------ drivers/md/raid10.c | 121 +-------------------------------------- drivers/md/raid5.c | 32 ----------- include/linux/blkdev.h | 10 ---- include/linux/device-mapper.h | 4 -- 32 files changed, 9 insertions(+), 859 deletions(-) (limited to 'drivers/md/raid0.c') diff --git a/block/blk-merge.c b/block/blk-merge.c index d9c3a75e4a60..0027def35f5a 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -69,24 +69,13 @@ static struct bio *blk_bio_segment_split(struct request_queue *q, struct bio *split; struct bio_vec bv, bvprv; struct bvec_iter iter; - unsigned seg_size = 0, nsegs = 0; + unsigned seg_size = 0, nsegs = 0, sectors = 0; int prev = 0; - struct bvec_merge_data bvm = { - .bi_bdev = bio->bi_bdev, - .bi_sector = bio->bi_iter.bi_sector, - .bi_size = 0, - .bi_rw = bio->bi_rw, - }; - bio_for_each_segment(bv, bio, iter) { - if (q->merge_bvec_fn && - q->merge_bvec_fn(q, &bvm, &bv) < (int) bv.bv_len) - goto split; - - bvm.bi_size += bv.bv_len; + sectors += bv.bv_len >> 9; - if (bvm.bi_size >> 9 > queue_max_sectors(q)) + if (sectors > queue_max_sectors(q)) goto split; /* diff --git a/block/blk-settings.c b/block/blk-settings.c index b38d8d723276..9df73991b231 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -53,28 +53,6 @@ void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn) } EXPORT_SYMBOL(blk_queue_unprep_rq); -/** - * blk_queue_merge_bvec - set a merge_bvec function for queue - * @q: queue - * @mbfn: merge_bvec_fn - * - * Usually queues have static limitations on the max sectors or segments that - * we can put in a request. Stacking drivers may have some settings that - * are dynamic, and thus we have to query the queue whether it is ok to - * add a new bio_vec to a bio at a given offset or not. If the block device - * has such limitations, it needs to register a merge_bvec_fn to control - * the size of bio's sent to it. Note that a block device *must* allow a - * single page to be added to an empty bio. The block device driver may want - * to use the bio_split() function to deal with these bio's. By default - * no merge_bvec_fn is defined for a queue, and only the fixed limits are - * honored. - */ -void blk_queue_merge_bvec(struct request_queue *q, merge_bvec_fn *mbfn) -{ - q->merge_bvec_fn = mbfn; -} -EXPORT_SYMBOL(blk_queue_merge_bvec); - void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn) { q->softirq_done_fn = fn; 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; diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 04d0dadc48b1..d2b5dfbb30cf 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -3771,26 +3771,6 @@ static int cache_iterate_devices(struct dm_target *ti, return r; } -/* - * We assume I/O is going to the origin (which is the volume - * more likely to have restrictions e.g. by being striped). - * (Looking up the exact location of the data would be expensive - * and could always be out of date by the time the bio is submitted.) - */ -static int cache_bvec_merge(struct dm_target *ti, - struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct cache *cache = ti->private; - struct request_queue *q = bdev_get_queue(cache->origin_dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = cache->origin_dev->bdev; - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static void set_discard_limits(struct cache *cache, struct queue_limits *limits) { /* @@ -3834,7 +3814,6 @@ static struct target_type cache_target = { .status = cache_status, .message = cache_message, .iterate_devices = cache_iterate_devices, - .merge = cache_bvec_merge, .io_hints = cache_io_hints, }; diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 59da573cf994..ba5c2105f4e6 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -2035,21 +2035,6 @@ error: return -EINVAL; } -static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct crypt_config *cc = ti->private; - struct request_queue *q = bdev_get_queue(cc->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = cc->dev->bdev; - bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int crypt_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { @@ -2070,7 +2055,6 @@ static struct target_type crypt_target = { .preresume = crypt_preresume, .resume = crypt_resume, .message = crypt_message, - .merge = crypt_merge, .iterate_devices = crypt_iterate_devices, }; diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c index ad913cd4aded..0119ebfb3d49 100644 --- a/drivers/md/dm-era-target.c +++ b/drivers/md/dm-era-target.c @@ -1673,20 +1673,6 @@ static int era_iterate_devices(struct dm_target *ti, return fn(ti, era->origin_dev, 0, get_dev_size(era->origin_dev), data); } -static int era_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct era *era = ti->private; - struct request_queue *q = bdev_get_queue(era->origin_dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = era->origin_dev->bdev; - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static void era_io_hints(struct dm_target *ti, struct queue_limits *limits) { struct era *era = ti->private; @@ -1717,7 +1703,6 @@ static struct target_type era_target = { .status = era_status, .message = era_message, .iterate_devices = era_iterate_devices, - .merge = era_merge, .io_hints = era_io_hints }; diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c index 04481247aab8..afab13bd683e 100644 --- a/drivers/md/dm-flakey.c +++ b/drivers/md/dm-flakey.c @@ -387,21 +387,6 @@ static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long ar return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg); } -static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct flakey_c *fc = ti->private; - struct request_queue *q = bdev_get_queue(fc->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = fc->dev->bdev; - bvm->bi_sector = flakey_map_sector(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { struct flakey_c *fc = ti->private; @@ -419,7 +404,6 @@ static struct target_type flakey_target = { .end_io = flakey_end_io, .status = flakey_status, .ioctl = flakey_ioctl, - .merge = flakey_merge, .iterate_devices = flakey_iterate_devices, }; diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 53e848c10939..7dd5fc8e3eea 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -130,21 +130,6 @@ static int linear_ioctl(struct dm_target *ti, unsigned int cmd, return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg); } -static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct linear_c *lc = ti->private; - struct request_queue *q = bdev_get_queue(lc->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = lc->dev->bdev; - bvm->bi_sector = linear_map_sector(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int linear_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { @@ -162,7 +147,6 @@ static struct target_type linear_target = { .map = linear_map, .status = linear_status, .ioctl = linear_ioctl, - .merge = linear_merge, .iterate_devices = linear_iterate_devices, }; diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c index e9d17488d5e3..316cc3fb741f 100644 --- a/drivers/md/dm-log-writes.c +++ b/drivers/md/dm-log-writes.c @@ -725,21 +725,6 @@ static int log_writes_ioctl(struct dm_target *ti, unsigned int cmd, return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg); } -static int log_writes_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct log_writes_c *lc = ti->private; - struct request_queue *q = bdev_get_queue(lc->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = lc->dev->bdev; - bvm->bi_sector = dm_target_offset(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int log_writes_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) @@ -793,7 +778,6 @@ static struct target_type log_writes_target = { .end_io = normal_end_io, .status = log_writes_status, .ioctl = log_writes_ioctl, - .merge = log_writes_merge, .message = log_writes_message, .iterate_devices = log_writes_iterate_devices, .io_hints = log_writes_io_hints, diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 2daa67793511..97e165183e79 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1717,24 +1717,6 @@ static void raid_resume(struct dm_target *ti) mddev_resume(&rs->md); } -static int raid_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct raid_set *rs = ti->private; - struct md_personality *pers = rs->md.pers; - - if (pers && pers->mergeable_bvec) - return min(max_size, pers->mergeable_bvec(&rs->md, bvm, biovec)); - - /* - * In case we can't request the personality because - * the raid set is not running yet - * - * -> return safe minimum - */ - return rs->md.chunk_sectors; -} - static struct target_type raid_target = { .name = "raid", .version = {1, 7, 0}, @@ -1749,7 +1731,6 @@ static struct target_type raid_target = { .presuspend = raid_presuspend, .postsuspend = raid_postsuspend, .resume = raid_resume, - .merge = raid_merge, }; static int __init dm_raid_init(void) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index dd8ca0bb0980..d10b6876018e 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -2330,20 +2330,6 @@ static void origin_status(struct dm_target *ti, status_type_t type, } } -static int origin_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct dm_origin *o = ti->private; - struct request_queue *q = bdev_get_queue(o->dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = o->dev->bdev; - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int origin_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { @@ -2362,7 +2348,6 @@ static struct target_type origin_target = { .resume = origin_resume, .postsuspend = origin_postsuspend, .status = origin_status, - .merge = origin_merge, .iterate_devices = origin_iterate_devices, }; diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 4f94c7da82f6..484029db8cba 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -412,26 +412,6 @@ static void stripe_io_hints(struct dm_target *ti, blk_limits_io_opt(limits, chunk_size * sc->stripes); } -static int stripe_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct stripe_c *sc = ti->private; - sector_t bvm_sector = bvm->bi_sector; - uint32_t stripe; - struct request_queue *q; - - stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector); - - q = bdev_get_queue(sc->stripe[stripe].dev->bdev); - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = sc->stripe[stripe].dev->bdev; - bvm->bi_sector = sc->stripe[stripe].physical_start + bvm_sector; - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static struct target_type stripe_target = { .name = "striped", .version = {1, 5, 1}, @@ -443,7 +423,6 @@ static struct target_type stripe_target = { .status = stripe_status, .iterate_devices = stripe_iterate_devices, .io_hints = stripe_io_hints, - .merge = stripe_merge, }; int __init dm_stripe_init(void) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 16ba55ad7089..afb4ad3dfeb3 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -440,14 +440,6 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, q->limits.alignment_offset, (unsigned long long) start << SECTOR_SHIFT); - /* - * Check if merge fn is supported. - * If not we'll force DM to use PAGE_SIZE or - * smaller I/O, just to be safe. - */ - if (dm_queue_merge_is_compulsory(q) && !ti->type->merge) - blk_limits_max_hw_sectors(limits, - (unsigned int) (PAGE_SIZE >> 9)); return 0; } diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 2ade2c46dca9..f352e4990998 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -3845,20 +3845,6 @@ static int pool_iterate_devices(struct dm_target *ti, return fn(ti, pt->data_dev, 0, ti->len, data); } -static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct pool_c *pt = ti->private; - struct request_queue *q = bdev_get_queue(pt->data_dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = pt->data_dev->bdev; - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) { struct pool_c *pt = ti->private; @@ -3935,7 +3921,6 @@ static struct target_type pool_target = { .resume = pool_resume, .message = pool_message, .status = pool_status, - .merge = pool_merge, .iterate_devices = pool_iterate_devices, .io_hints = pool_io_hints, }; @@ -4262,21 +4247,6 @@ err: DMEMIT("Error"); } -static int thin_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct thin_c *tc = ti->private; - struct request_queue *q = bdev_get_queue(tc->pool_dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = tc->pool_dev->bdev; - bvm->bi_sector = dm_target_offset(ti, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int thin_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { @@ -4320,7 +4290,6 @@ static struct target_type thin_target = { .presuspend = thin_presuspend, .postsuspend = thin_postsuspend, .status = thin_status, - .merge = thin_merge, .iterate_devices = thin_iterate_devices, .io_hints = thin_io_hints, }; diff --git a/drivers/md/dm-verity.c b/drivers/md/dm-verity.c index 4b34df8fdb58..c137dcb147b8 100644 --- a/drivers/md/dm-verity.c +++ b/drivers/md/dm-verity.c @@ -649,21 +649,6 @@ static int verity_ioctl(struct dm_target *ti, unsigned cmd, cmd, arg); } -static int verity_merge(struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size) -{ - struct dm_verity *v = ti->private; - struct request_queue *q = bdev_get_queue(v->data_dev->bdev); - - if (!q->merge_bvec_fn) - return max_size; - - bvm->bi_bdev = v->data_dev->bdev; - bvm->bi_sector = verity_map_sector(v, bvm->bi_sector); - - return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); -} - static int verity_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) { @@ -996,7 +981,6 @@ static struct target_type verity_target = { .map = verity_map, .status = verity_status, .ioctl = verity_ioctl, - .merge = verity_merge, .iterate_devices = verity_iterate_devices, .io_hints = verity_io_hints, }; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 069f8d7e890e..8bb1ebb6ca7b 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -124,9 +124,8 @@ EXPORT_SYMBOL_GPL(dm_get_rq_mapinfo); #define DMF_FREEING 3 #define DMF_DELETING 4 #define DMF_NOFLUSH_SUSPENDING 5 -#define DMF_MERGE_IS_OPTIONAL 6 -#define DMF_DEFERRED_REMOVE 7 -#define DMF_SUSPENDED_INTERNALLY 8 +#define DMF_DEFERRED_REMOVE 6 +#define DMF_SUSPENDED_INTERNALLY 7 /* * A dummy definition to make RCU happy. @@ -1725,67 +1724,6 @@ static void __split_and_process_bio(struct mapped_device *md, * CRUD END *---------------------------------------------------------------*/ -static int dm_merge_bvec(struct request_queue *q, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct mapped_device *md = q->queuedata; - struct dm_table *map = dm_get_live_table_fast(md); - struct dm_target *ti; - sector_t max_sectors, max_size = 0; - - if (unlikely(!map)) - goto out; - - ti = dm_table_find_target(map, bvm->bi_sector); - if (!dm_target_is_valid(ti)) - goto out; - - /* - * Find maximum amount of I/O that won't need splitting - */ - max_sectors = min(max_io_len(bvm->bi_sector, ti), - (sector_t) queue_max_sectors(q)); - max_size = (max_sectors << SECTOR_SHIFT) - bvm->bi_size; - - /* - * FIXME: this stop-gap fix _must_ be cleaned up (by passing a sector_t - * to the targets' merge function since it holds sectors not bytes). - * Just doing this as an interim fix for stable@ because the more - * comprehensive cleanup of switching to sector_t will impact every - * DM target that implements a ->merge hook. - */ - if (max_size > INT_MAX) - max_size = INT_MAX; - - /* - * merge_bvec_fn() returns number of bytes - * it can accept at this offset - * max is precomputed maximal io size - */ - if (max_size && ti->type->merge) - max_size = ti->type->merge(ti, bvm, biovec, (int) max_size); - /* - * If the target doesn't support merge method and some of the devices - * provided their merge_bvec method (we know this by looking for the - * max_hw_sectors that dm_set_device_limits may set), then we can't - * allow bios with multiple vector entries. So always set max_size - * to 0, and the code below allows just one page. - */ - else if (queue_max_hw_sectors(q) <= PAGE_SIZE >> 9) - max_size = 0; - -out: - dm_put_live_table_fast(md); - /* - * Always allow an entire first page - */ - if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT)) - max_size = biovec->bv_len; - - return max_size; -} - /* * The request function that just remaps the bio built up by * dm_merge_bvec. @@ -2507,59 +2445,6 @@ static void __set_size(struct mapped_device *md, sector_t size) i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); } -/* - * Return 1 if the queue has a compulsory merge_bvec_fn function. - * - * If this function returns 0, then the device is either a non-dm - * device without a merge_bvec_fn, or it is a dm device that is - * able to split any bios it receives that are too big. - */ -int dm_queue_merge_is_compulsory(struct request_queue *q) -{ - struct mapped_device *dev_md; - - if (!q->merge_bvec_fn) - return 0; - - if (q->make_request_fn == dm_make_request) { - dev_md = q->queuedata; - if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags)) - return 0; - } - - return 1; -} - -static int dm_device_merge_is_compulsory(struct dm_target *ti, - struct dm_dev *dev, sector_t start, - sector_t len, void *data) -{ - struct block_device *bdev = dev->bdev; - struct request_queue *q = bdev_get_queue(bdev); - - return dm_queue_merge_is_compulsory(q); -} - -/* - * Return 1 if it is acceptable to ignore merge_bvec_fn based - * on the properties of the underlying devices. - */ -static int dm_table_merge_is_optional(struct dm_table *table) -{ - unsigned i = 0; - struct dm_target *ti; - - while (i < dm_table_get_num_targets(table)) { - ti = dm_table_get_target(table, i++); - - if (ti->type->iterate_devices && - ti->type->iterate_devices(ti, dm_device_merge_is_compulsory, NULL)) - return 0; - } - - return 1; -} - /* * Returns old map, which caller must destroy. */ @@ -2569,7 +2454,6 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, struct dm_table *old_map; struct request_queue *q = md->queue; sector_t size; - int merge_is_optional; size = dm_table_get_size(t); @@ -2595,17 +2479,11 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, __bind_mempools(md, t); - merge_is_optional = dm_table_merge_is_optional(t); - old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); rcu_assign_pointer(md->map, t); md->immutable_target_type = dm_table_get_immutable_target_type(t); dm_table_set_restrictions(t, q, limits); - if (merge_is_optional) - set_bit(DMF_MERGE_IS_OPTIONAL, &md->flags); - else - clear_bit(DMF_MERGE_IS_OPTIONAL, &md->flags); if (old_map) dm_sync_table(md); @@ -2886,7 +2764,6 @@ int dm_setup_md_queue(struct mapped_device *md) case DM_TYPE_BIO_BASED: dm_init_old_md_queue(md); blk_queue_make_request(md->queue, dm_make_request); - blk_queue_merge_bvec(md->queue, dm_merge_bvec); break; } diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 4e984993d40a..7edcf97dfa5a 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -78,8 +78,6 @@ bool dm_table_mq_request_based(struct dm_table *t); void dm_table_free_md_mempools(struct dm_table *t); struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); -int dm_queue_merge_is_compulsory(struct request_queue *q); - void dm_lock_md_type(struct mapped_device *md); void dm_unlock_md_type(struct mapped_device *md); void dm_set_md_type(struct mapped_device *md, unsigned type); diff --git a/drivers/md/linear.c b/drivers/md/linear.c index aefd66142eef..b7fe7e9fc777 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -52,48 +52,6 @@ static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector) return conf->disks + lo; } -/** - * linear_mergeable_bvec -- tell bio layer if two requests can be merged - * @q: request queue - * @bvm: properties of new bio - * @biovec: the request that could be merged to it. - * - * Return amount of bytes we can take at this offset - */ -static int linear_mergeable_bvec(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct dev_info *dev0; - unsigned long maxsectors, bio_sectors = bvm->bi_size >> 9; - sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); - int maxbytes = biovec->bv_len; - struct request_queue *subq; - - dev0 = which_dev(mddev, sector); - maxsectors = dev0->end_sector - sector; - subq = bdev_get_queue(dev0->rdev->bdev); - if (subq->merge_bvec_fn) { - bvm->bi_bdev = dev0->rdev->bdev; - bvm->bi_sector -= dev0->end_sector - dev0->rdev->sectors; - maxbytes = min(maxbytes, subq->merge_bvec_fn(subq, bvm, - biovec)); - } - - if (maxsectors < bio_sectors) - maxsectors = 0; - else - maxsectors -= bio_sectors; - - if (maxsectors <= (PAGE_SIZE >> 9 ) && bio_sectors == 0) - return maxbytes; - - if (maxsectors > (maxbytes >> 9)) - return maxbytes; - else - return maxsectors << 9; -} - static int linear_congested(struct mddev *mddev, int bits) { struct linear_conf *conf; @@ -338,7 +296,6 @@ static struct md_personality linear_personality = .size = linear_size, .quiesce = linear_quiesce, .congested = linear_congested, - .mergeable_bvec = linear_mergeable_bvec, }; static int __init linear_init (void) diff --git a/drivers/md/md.c b/drivers/md/md.c index e1d8723720cc..d28bf5cea224 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -354,29 +354,6 @@ static int md_congested(void *data, int bits) return mddev_congested(mddev, bits); } -static int md_mergeable_bvec(struct request_queue *q, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct mddev *mddev = q->queuedata; - int ret; - rcu_read_lock(); - if (mddev->suspended) { - /* Must always allow one vec */ - if (bvm->bi_size == 0) - ret = biovec->bv_len; - else - ret = 0; - } else { - struct md_personality *pers = mddev->pers; - if (pers && pers->mergeable_bvec) - ret = pers->mergeable_bvec(mddev, bvm, biovec); - else - ret = biovec->bv_len; - } - rcu_read_unlock(); - return ret; -} /* * Generic flush handling for md */ @@ -5188,7 +5165,6 @@ int md_run(struct mddev *mddev) if (mddev->queue) { mddev->queue->backing_dev_info.congested_data = mddev; mddev->queue->backing_dev_info.congested_fn = md_congested; - blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); } if (pers->sync_request) { if (mddev->kobj.sd && @@ -5317,7 +5293,6 @@ static void md_clean(struct mddev *mddev) mddev->degraded = 0; mddev->safemode = 0; mddev->private = NULL; - mddev->merge_check_needed = 0; mddev->bitmap_info.offset = 0; mddev->bitmap_info.default_offset = 0; mddev->bitmap_info.default_space = 0; @@ -5514,7 +5489,6 @@ static int do_md_stop(struct mddev *mddev, int mode, __md_stop_writes(mddev); __md_stop(mddev); - mddev->queue->merge_bvec_fn = NULL; mddev->queue->backing_dev_info.congested_fn = NULL; /* tell userspace to handle 'inactive' */ diff --git a/drivers/md/md.h b/drivers/md/md.h index 7da6e9c3cb53..ab339571e57f 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -134,10 +134,6 @@ enum flag_bits { Bitmap_sync, /* ..actually, not quite In_sync. Need a * bitmap-based recovery to get fully in sync */ - Unmerged, /* device is being added to array and should - * be considerred for bvec_merge_fn but not - * yet for actual IO - */ WriteMostly, /* Avoid reading if at all possible */ AutoDetected, /* added by auto-detect */ Blocked, /* An error occurred but has not yet @@ -374,10 +370,6 @@ struct mddev { int degraded; /* whether md should consider * adding a spare */ - int merge_check_needed; /* at least one - * member device - * has a - * merge_bvec_fn */ atomic_t recovery_active; /* blocks scheduled, but not written */ wait_queue_head_t recovery_wait; @@ -532,10 +524,6 @@ struct md_personality /* congested implements bdi.congested_fn(). * Will not be called while array is 'suspended' */ int (*congested)(struct mddev *mddev, int bits); - /* mergeable_bvec is use to implement ->merge_bvec_fn */ - int (*mergeable_bvec)(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec); }; struct md_sysfs_entry { diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 082a489af9d3..d222522c52e0 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -257,18 +257,6 @@ static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev) disk_stack_limits(mddev->gendisk, rdev->bdev, rdev->data_offset << 9); - /* as we don't honour merge_bvec_fn, we must never risk - * violating it, so limit ->max_segments to one, lying - * within a single page. - * (Note: it is very unlikely that a device with - * merge_bvec_fn will be involved in multipath.) - */ - if (q->merge_bvec_fn) { - blk_queue_max_segments(mddev->queue, 1); - blk_queue_segment_boundary(mddev->queue, - PAGE_CACHE_SIZE - 1); - } - spin_lock_irq(&conf->device_lock); mddev->degraded--; rdev->raid_disk = path; @@ -432,15 +420,6 @@ static int multipath_run (struct mddev *mddev) disk_stack_limits(mddev->gendisk, rdev->bdev, rdev->data_offset << 9); - /* as we don't honour merge_bvec_fn, we must never risk - * violating it, not that we ever expect a device with - * a merge_bvec_fn to be involved in multipath */ - if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { - blk_queue_max_segments(mddev->queue, 1); - blk_queue_segment_boundary(mddev->queue, - PAGE_CACHE_SIZE - 1); - } - if (!test_bit(Faulty, &rdev->flags)) working_disks++; } diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index e6e0ae56f66b..59cda501a224 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -192,9 +192,6 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) disk_stack_limits(mddev->gendisk, rdev1->bdev, rdev1->data_offset << 9); - if (rdev1->bdev->bd_disk->queue->merge_bvec_fn) - conf->has_merge_bvec = 1; - if (!smallest || (rdev1->sectors < smallest->sectors)) smallest = rdev1; cnt++; @@ -351,58 +348,6 @@ static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, + sector_div(sector, zone->nb_dev)]; } -/** - * raid0_mergeable_bvec -- tell bio layer if two requests can be merged - * @mddev: the md device - * @bvm: properties of new bio - * @biovec: the request that could be merged to it. - * - * Return amount of bytes we can accept at this offset - */ -static int raid0_mergeable_bvec(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct r0conf *conf = mddev->private; - sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); - sector_t sector_offset = sector; - int max; - unsigned int chunk_sectors = mddev->chunk_sectors; - unsigned int bio_sectors = bvm->bi_size >> 9; - struct strip_zone *zone; - struct md_rdev *rdev; - struct request_queue *subq; - - if (is_power_of_2(chunk_sectors)) - max = (chunk_sectors - ((sector & (chunk_sectors-1)) - + bio_sectors)) << 9; - else - max = (chunk_sectors - (sector_div(sector, chunk_sectors) - + bio_sectors)) << 9; - if (max < 0) - max = 0; /* bio_add cannot handle a negative return */ - if (max <= biovec->bv_len && bio_sectors == 0) - return biovec->bv_len; - if (max < biovec->bv_len) - /* too small already, no need to check further */ - return max; - if (!conf->has_merge_bvec) - return max; - - /* May need to check subordinate device */ - sector = sector_offset; - zone = find_zone(mddev->private, §or_offset); - rdev = map_sector(mddev, zone, sector, §or_offset); - subq = bdev_get_queue(rdev->bdev); - if (subq->merge_bvec_fn) { - bvm->bi_bdev = rdev->bdev; - bvm->bi_sector = sector_offset + zone->dev_start + - rdev->data_offset; - return min(max, subq->merge_bvec_fn(subq, bvm, biovec)); - } else - return max; -} - static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) { sector_t array_sectors = 0; @@ -727,7 +672,6 @@ static struct md_personality raid0_personality= .takeover = raid0_takeover, .quiesce = raid0_quiesce, .congested = raid0_congested, - .mergeable_bvec = raid0_mergeable_bvec, }; static int __init raid0_init (void) diff --git a/drivers/md/raid0.h b/drivers/md/raid0.h index 05539d9c97f0..7127a623f5da 100644 --- a/drivers/md/raid0.h +++ b/drivers/md/raid0.h @@ -12,8 +12,6 @@ struct r0conf { struct md_rdev **devlist; /* lists of rdevs, pointed to * by strip_zone->dev */ int nr_strip_zones; - int has_merge_bvec; /* at least one member has - * a merge_bvec_fn */ }; #endif diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 60d0a8626e63..0ff06fdb83a9 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -557,7 +557,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect rdev = rcu_dereference(conf->mirrors[disk].rdev); if (r1_bio->bios[disk] == IO_BLOCKED || rdev == NULL - || test_bit(Unmerged, &rdev->flags) || test_bit(Faulty, &rdev->flags)) continue; if (!test_bit(In_sync, &rdev->flags) && @@ -708,38 +707,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect return best_disk; } -static int raid1_mergeable_bvec(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct r1conf *conf = mddev->private; - sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); - int max = biovec->bv_len; - - if (mddev->merge_check_needed) { - int disk; - rcu_read_lock(); - for (disk = 0; disk < conf->raid_disks * 2; disk++) { - struct md_rdev *rdev = rcu_dereference( - conf->mirrors[disk].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags)) { - struct request_queue *q = - bdev_get_queue(rdev->bdev); - if (q->merge_bvec_fn) { - bvm->bi_sector = sector + - rdev->data_offset; - bvm->bi_bdev = rdev->bdev; - max = min(max, q->merge_bvec_fn( - q, bvm, biovec)); - } - } - } - rcu_read_unlock(); - } - return max; - -} - static int raid1_congested(struct mddev *mddev, int bits) { struct r1conf *conf = mddev->private; @@ -1268,8 +1235,7 @@ read_again: break; } r1_bio->bios[i] = NULL; - if (!rdev || test_bit(Faulty, &rdev->flags) - || test_bit(Unmerged, &rdev->flags)) { + if (!rdev || test_bit(Faulty, &rdev->flags)) { if (i < conf->raid_disks) set_bit(R1BIO_Degraded, &r1_bio->state); continue; @@ -1614,7 +1580,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) struct raid1_info *p; int first = 0; int last = conf->raid_disks - 1; - struct request_queue *q = bdev_get_queue(rdev->bdev); if (mddev->recovery_disabled == conf->recovery_disabled) return -EBUSY; @@ -1622,11 +1587,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) if (rdev->raid_disk >= 0) first = last = rdev->raid_disk; - if (q->merge_bvec_fn) { - set_bit(Unmerged, &rdev->flags); - mddev->merge_check_needed = 1; - } - for (mirror = first; mirror <= last; mirror++) { p = conf->mirrors+mirror; if (!p->rdev) { @@ -1658,19 +1618,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) break; } } - if (err == 0 && test_bit(Unmerged, &rdev->flags)) { - /* Some requests might not have seen this new - * merge_bvec_fn. We must wait for them to complete - * before merging the device fully. - * First we make sure any code which has tested - * our function has submitted the request, then - * we wait for all outstanding requests to complete. - */ - synchronize_sched(); - freeze_array(conf, 0); - unfreeze_array(conf); - clear_bit(Unmerged, &rdev->flags); - } md_integrity_add_rdev(rdev, mddev); if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); @@ -2806,8 +2753,6 @@ static struct r1conf *setup_conf(struct mddev *mddev) goto abort; disk->rdev = rdev; q = bdev_get_queue(rdev->bdev); - if (q->merge_bvec_fn) - mddev->merge_check_needed = 1; disk->head_position = 0; disk->seq_start = MaxSector; @@ -3172,7 +3117,6 @@ static struct md_personality raid1_personality = .quiesce = raid1_quiesce, .takeover = raid1_takeover, .congested = raid1_congested, - .mergeable_bvec = raid1_mergeable_bvec, }; static int __init raid_init(void) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 316ff6f611e9..d92098f3e65b 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -671,93 +671,6 @@ static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev) return (vchunk << geo->chunk_shift) + offset; } -/** - * raid10_mergeable_bvec -- tell bio layer if a two requests can be merged - * @mddev: the md device - * @bvm: properties of new bio - * @biovec: the request that could be merged to it. - * - * Return amount of bytes we can accept at this offset - * This requires checking for end-of-chunk if near_copies != raid_disks, - * and for subordinate merge_bvec_fns if merge_check_needed. - */ -static int raid10_mergeable_bvec(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - struct r10conf *conf = mddev->private; - sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); - int max; - unsigned int chunk_sectors; - unsigned int bio_sectors = bvm->bi_size >> 9; - struct geom *geo = &conf->geo; - - chunk_sectors = (conf->geo.chunk_mask & conf->prev.chunk_mask) + 1; - if (conf->reshape_progress != MaxSector && - ((sector >= conf->reshape_progress) != - conf->mddev->reshape_backwards)) - geo = &conf->prev; - - if (geo->near_copies < geo->raid_disks) { - max = (chunk_sectors - ((sector & (chunk_sectors - 1)) - + bio_sectors)) << 9; - if (max < 0) - /* bio_add cannot handle a negative return */ - max = 0; - if (max <= biovec->bv_len && bio_sectors == 0) - return biovec->bv_len; - } else - max = biovec->bv_len; - - if (mddev->merge_check_needed) { - struct { - struct r10bio r10_bio; - struct r10dev devs[conf->copies]; - } on_stack; - struct r10bio *r10_bio = &on_stack.r10_bio; - int s; - if (conf->reshape_progress != MaxSector) { - /* Cannot give any guidance during reshape */ - if (max <= biovec->bv_len && bio_sectors == 0) - return biovec->bv_len; - return 0; - } - r10_bio->sector = sector; - raid10_find_phys(conf, r10_bio); - rcu_read_lock(); - for (s = 0; s < conf->copies; s++) { - int disk = r10_bio->devs[s].devnum; - struct md_rdev *rdev = rcu_dereference( - conf->mirrors[disk].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags)) { - struct request_queue *q = - bdev_get_queue(rdev->bdev); - if (q->merge_bvec_fn) { - bvm->bi_sector = r10_bio->devs[s].addr - + rdev->data_offset; - bvm->bi_bdev = rdev->bdev; - max = min(max, q->merge_bvec_fn( - q, bvm, biovec)); - } - } - rdev = rcu_dereference(conf->mirrors[disk].replacement); - if (rdev && !test_bit(Faulty, &rdev->flags)) { - struct request_queue *q = - bdev_get_queue(rdev->bdev); - if (q->merge_bvec_fn) { - bvm->bi_sector = r10_bio->devs[s].addr - + rdev->data_offset; - bvm->bi_bdev = rdev->bdev; - max = min(max, q->merge_bvec_fn( - q, bvm, biovec)); - } - } - } - rcu_read_unlock(); - } - return max; -} - /* * This routine returns the disk from which the requested read should * be done. There is a per-array 'next expected sequential IO' sector @@ -820,12 +733,10 @@ retry: disk = r10_bio->devs[slot].devnum; rdev = rcu_dereference(conf->mirrors[disk].replacement); if (rdev == NULL || test_bit(Faulty, &rdev->flags) || - test_bit(Unmerged, &rdev->flags) || r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) rdev = rcu_dereference(conf->mirrors[disk].rdev); if (rdev == NULL || - test_bit(Faulty, &rdev->flags) || - test_bit(Unmerged, &rdev->flags)) + test_bit(Faulty, &rdev->flags)) continue; if (!test_bit(In_sync, &rdev->flags) && r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) @@ -1325,11 +1236,9 @@ retry_write: blocked_rdev = rrdev; break; } - if (rdev && (test_bit(Faulty, &rdev->flags) - || test_bit(Unmerged, &rdev->flags))) + if (rdev && (test_bit(Faulty, &rdev->flags))) rdev = NULL; - if (rrdev && (test_bit(Faulty, &rrdev->flags) - || test_bit(Unmerged, &rrdev->flags))) + if (rrdev && (test_bit(Faulty, &rrdev->flags))) rrdev = NULL; r10_bio->devs[i].bio = NULL; @@ -1776,7 +1685,6 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) int mirror; int first = 0; int last = conf->geo.raid_disks - 1; - struct request_queue *q = bdev_get_queue(rdev->bdev); if (mddev->recovery_cp < MaxSector) /* only hot-add to in-sync arrays, as recovery is @@ -1789,11 +1697,6 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) if (rdev->raid_disk >= 0) first = last = rdev->raid_disk; - if (q->merge_bvec_fn) { - set_bit(Unmerged, &rdev->flags); - mddev->merge_check_needed = 1; - } - if (rdev->saved_raid_disk >= first && conf->mirrors[rdev->saved_raid_disk].rdev == NULL) mirror = rdev->saved_raid_disk; @@ -1832,19 +1735,6 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) rcu_assign_pointer(p->rdev, rdev); break; } - if (err == 0 && test_bit(Unmerged, &rdev->flags)) { - /* Some requests might not have seen this new - * merge_bvec_fn. We must wait for them to complete - * before merging the device fully. - * First we make sure any code which has tested - * our function has submitted the request, then - * we wait for all outstanding requests to complete. - */ - synchronize_sched(); - freeze_array(conf, 0); - unfreeze_array(conf); - clear_bit(Unmerged, &rdev->flags); - } md_integrity_add_rdev(rdev, mddev); if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); @@ -2392,7 +2282,6 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10 d = r10_bio->devs[sl].devnum; rdev = rcu_dereference(conf->mirrors[d].rdev); if (rdev && - !test_bit(Unmerged, &rdev->flags) && test_bit(In_sync, &rdev->flags) && is_badblock(rdev, r10_bio->devs[sl].addr + sect, s, &first_bad, &bad_sectors) == 0) { @@ -2446,7 +2335,6 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10 d = r10_bio->devs[sl].devnum; rdev = rcu_dereference(conf->mirrors[d].rdev); if (!rdev || - test_bit(Unmerged, &rdev->flags) || !test_bit(In_sync, &rdev->flags)) continue; @@ -3638,8 +3526,6 @@ static int run(struct mddev *mddev) disk->rdev = rdev; } q = bdev_get_queue(rdev->bdev); - if (q->merge_bvec_fn) - mddev->merge_check_needed = 1; diff = (rdev->new_data_offset - rdev->data_offset); if (!mddev->reshape_backwards) diff = -diff; @@ -4692,7 +4578,6 @@ static struct md_personality raid10_personality = .start_reshape = raid10_start_reshape, .finish_reshape = raid10_finish_reshape, .congested = raid10_congested, - .mergeable_bvec = raid10_mergeable_bvec, }; static int __init raid_init(void) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 7823295332de..6d20692952d2 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4663,35 +4663,6 @@ static int raid5_congested(struct mddev *mddev, int bits) return 0; } -/* We want read requests to align with chunks where possible, - * but write requests don't need to. - */ -static int raid5_mergeable_bvec(struct mddev *mddev, - struct bvec_merge_data *bvm, - struct bio_vec *biovec) -{ - sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); - int max; - unsigned int chunk_sectors = mddev->chunk_sectors; - unsigned int bio_sectors = bvm->bi_size >> 9; - - /* - * always allow writes to be mergeable, read as well if array - * is degraded as we'll go through stripe cache anyway. - */ - if ((bvm->bi_rw & 1) == WRITE || mddev->degraded) - return biovec->bv_len; - - if (mddev->new_chunk_sectors < mddev->chunk_sectors) - chunk_sectors = mddev->new_chunk_sectors; - max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9; - if (max < 0) max = 0; - if (max <= biovec->bv_len && bio_sectors == 0) - return biovec->bv_len; - else - return max; -} - static int in_chunk_boundary(struct mddev *mddev, struct bio *bio) { sector_t sector = bio->bi_iter.bi_sector + get_start_sect(bio->bi_bdev); @@ -7764,7 +7735,6 @@ static struct md_personality raid6_personality = .quiesce = raid5_quiesce, .takeover = raid6_takeover, .congested = raid5_congested, - .mergeable_bvec = raid5_mergeable_bvec, }; static struct md_personality raid5_personality = { @@ -7788,7 +7758,6 @@ static struct md_personality raid5_personality = .quiesce = raid5_quiesce, .takeover = raid5_takeover, .congested = raid5_congested, - .mergeable_bvec = raid5_mergeable_bvec, }; static struct md_personality raid4_personality = @@ -7813,7 +7782,6 @@ static struct md_personality raid4_personality = .quiesce = raid5_quiesce, .takeover = raid4_takeover, .congested = raid5_congested, - .mergeable_bvec = raid5_mergeable_bvec, }; static int __init raid5_init(void) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index ca778d9c7d81..a1feff54aeab 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -213,14 +213,6 @@ typedef int (prep_rq_fn) (struct request_queue *, struct request *); typedef void (unprep_rq_fn) (struct request_queue *, struct request *); struct bio_vec; -struct bvec_merge_data { - struct block_device *bi_bdev; - sector_t bi_sector; - unsigned bi_size; - unsigned long bi_rw; -}; -typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, - struct bio_vec *); typedef void (softirq_done_fn)(struct request *); typedef int (dma_drain_needed_fn)(struct request *); typedef int (lld_busy_fn) (struct request_queue *q); @@ -306,7 +298,6 @@ struct request_queue { make_request_fn *make_request_fn; prep_rq_fn *prep_rq_fn; unprep_rq_fn *unprep_rq_fn; - merge_bvec_fn *merge_bvec_fn; softirq_done_fn *softirq_done_fn; rq_timed_out_fn *rq_timed_out_fn; dma_drain_needed_fn *dma_drain_needed; @@ -992,7 +983,6 @@ extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); -extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); extern void blk_queue_dma_alignment(struct request_queue *, int); extern void blk_queue_update_dma_alignment(struct request_queue *, int); extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 51cc1deb7af3..76d23fa8c7d3 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -82,9 +82,6 @@ typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv); typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd, unsigned long arg); -typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm, - struct bio_vec *biovec, int max_size); - /* * These iteration functions are typically used to check (and combine) * properties of underlying devices. @@ -160,7 +157,6 @@ struct target_type { dm_status_fn status; dm_message_fn message; dm_ioctl_fn ioctl; - dm_merge_fn merge; dm_busy_fn busy; dm_iterate_devices_fn iterate_devices; dm_io_hints_fn io_hints; -- cgit v1.2.3-70-g09d2