diff options
| -rw-r--r-- | drivers/md/dm-mpath.c | 51 | ||||
| -rw-r--r-- | drivers/md/dm-table.c | 34 | ||||
| -rw-r--r-- | drivers/md/dm-target.c | 15 | ||||
| -rw-r--r-- | drivers/md/dm.c | 114 | ||||
| -rw-r--r-- | drivers/md/dm.h | 8 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 7 | ||||
| -rw-r--r-- | include/uapi/linux/dm-ioctl.h | 4 |
7 files changed, 185 insertions, 48 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 2552b88f8953..863fc8c1ac06 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -11,6 +11,7 @@ #include "dm-path-selector.h" #include "dm-uevent.h" +#include <linux/blkdev.h> #include <linux/ctype.h> #include <linux/init.h> #include <linux/mempool.h> @@ -378,12 +379,13 @@ static int __must_push_back(struct multipath *m) /* * Map cloned requests */ -static int multipath_map(struct dm_target *ti, struct request *clone, - union map_info *map_context) +static int __multipath_map(struct dm_target *ti, struct request *clone, + union map_info *map_context, + struct request *rq, struct request **__clone) { struct multipath *m = (struct multipath *) ti->private; int r = DM_MAPIO_REQUEUE; - size_t nr_bytes = blk_rq_bytes(clone); + size_t nr_bytes = clone ? blk_rq_bytes(clone) : blk_rq_bytes(rq); struct pgpath *pgpath; struct block_device *bdev; struct dm_mpath_io *mpio; @@ -416,12 +418,25 @@ static int multipath_map(struct dm_target *ti, struct request *clone, bdev = pgpath->path.dev->bdev; - clone->q = bdev_get_queue(bdev); - clone->rq_disk = bdev->bd_disk; - clone->cmd_flags |= REQ_FAILFAST_TRANSPORT; - spin_unlock_irq(&m->lock); + if (clone) { + /* Old request-based interface: allocated clone is passed in */ + clone->q = bdev_get_queue(bdev); + clone->rq_disk = bdev->bd_disk; + clone->cmd_flags |= REQ_FAILFAST_TRANSPORT; + } else { + /* blk-mq request-based interface */ + *__clone = blk_get_request(bdev_get_queue(bdev), + rq_data_dir(rq), GFP_KERNEL); + if (IS_ERR(*__clone)) + /* ENOMEM, requeue */ + return r; + (*__clone)->bio = (*__clone)->biotail = NULL; + (*__clone)->rq_disk = bdev->bd_disk; + (*__clone)->cmd_flags |= REQ_FAILFAST_TRANSPORT; + } + if (pgpath->pg->ps.type->start_io) pgpath->pg->ps.type->start_io(&pgpath->pg->ps, &pgpath->path, @@ -434,6 +449,24 @@ out_unlock: return r; } +static int multipath_map(struct dm_target *ti, struct request *clone, + union map_info *map_context) +{ + return __multipath_map(ti, clone, map_context, NULL, NULL); +} + +static int multipath_clone_and_map(struct dm_target *ti, struct request *rq, + union map_info *map_context, + struct request **clone) +{ + return __multipath_map(ti, NULL, map_context, rq, clone); +} + +static void multipath_release_clone(struct request *clone) +{ + blk_put_request(clone); +} + /* * If we run out of usable paths, should we queue I/O or error it? */ @@ -1670,11 +1703,13 @@ out: *---------------------------------------------------------------*/ static struct target_type multipath_target = { .name = "multipath", - .version = {1, 7, 0}, + .version = {1, 8, 0}, .module = THIS_MODULE, .ctr = multipath_ctr, .dtr = multipath_dtr, .map_rq = multipath_map, + .clone_and_map_rq = multipath_clone_and_map, + .release_clone_rq = multipath_release_clone, .rq_end_io = multipath_end_io, .presuspend = multipath_presuspend, .postsuspend = multipath_postsuspend, diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 3afae9e062f8..2d7e373955f3 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -827,6 +827,7 @@ static int dm_table_set_type(struct dm_table *t) { unsigned i; unsigned bio_based = 0, request_based = 0, hybrid = 0; + bool use_blk_mq = false; struct dm_target *tgt; struct dm_dev_internal *dd; struct list_head *devices; @@ -872,11 +873,26 @@ static int dm_table_set_type(struct dm_table *t) /* Non-request-stackable devices can't be used for request-based dm */ devices = dm_table_get_devices(t); list_for_each_entry(dd, devices, list) { - if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev->bdev))) { - DMWARN("table load rejected: including" - " non-request-stackable devices"); + struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); + + if (!blk_queue_stackable(q)) { + DMERR("table load rejected: including" + " non-request-stackable devices"); return -EINVAL; } + + if (q->mq_ops) + use_blk_mq = true; + } + + if (use_blk_mq) { + /* verify _all_ devices in the table are blk-mq devices */ + list_for_each_entry(dd, devices, list) + if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) { + DMERR("table load rejected: not all devices" + " are blk-mq request-stackable"); + return -EINVAL; + } } /* @@ -890,7 +906,7 @@ static int dm_table_set_type(struct dm_table *t) return -EINVAL; } - t->type = DM_TYPE_REQUEST_BASED; + t->type = !use_blk_mq ? DM_TYPE_REQUEST_BASED : DM_TYPE_MQ_REQUEST_BASED; return 0; } @@ -907,7 +923,15 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t) bool dm_table_request_based(struct dm_table *t) { - return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED; + unsigned table_type = dm_table_get_type(t); + + return (table_type == DM_TYPE_REQUEST_BASED || + table_type == DM_TYPE_MQ_REQUEST_BASED); +} + +bool dm_table_mq_request_based(struct dm_table *t) +{ + return dm_table_get_type(t) == DM_TYPE_MQ_REQUEST_BASED; } static int dm_table_alloc_md_mempools(struct dm_table *t) diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c index 242e3cec397a..925ec1b15e75 100644 --- a/drivers/md/dm-target.c +++ b/drivers/md/dm-target.c @@ -137,13 +137,26 @@ static int io_err_map_rq(struct dm_target *ti, struct request *clone, return -EIO; } +static int io_err_clone_and_map_rq(struct dm_target *ti, struct request *rq, + union map_info *map_context, + struct request **clone) +{ + return -EIO; +} + +static void io_err_release_clone_rq(struct request *clone) +{ +} + static struct target_type error_target = { .name = "error", - .version = {1, 2, 0}, + .version = {1, 3, 0}, .ctr = io_err_ctr, .dtr = io_err_dtr, .map = io_err_map, .map_rq = io_err_map_rq, + .clone_and_map_rq = io_err_clone_and_map_rq, + .release_clone_rq = io_err_release_clone_rq, }; int __init dm_target_init(void) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ae1219893948..549b815999a1 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1044,7 +1044,10 @@ static void free_rq_clone(struct request *clone) struct dm_rq_target_io *tio = clone->end_io_data; blk_rq_unprep_clone(clone); - free_clone_request(tio->md, clone); + if (clone->q && clone->q->mq_ops) + tio->ti->type->release_clone_rq(clone); + else + free_clone_request(tio->md, clone); free_rq_tio(tio); } @@ -1086,7 +1089,8 @@ static void dm_unprep_request(struct request *rq) rq->special = NULL; rq->cmd_flags &= ~REQ_DONTPREP; - free_rq_clone(clone); + if (clone) + free_rq_clone(clone); } /* @@ -1185,6 +1189,13 @@ static void dm_softirq_done(struct request *rq) struct dm_rq_target_io *tio = rq->special; struct request *clone = tio->clone; + if (!clone) { + blk_end_request_all(rq, tio->error); + rq_completed(tio->md, rq_data_dir(rq), false); + free_rq_tio(tio); + return; + } + if (rq->cmd_flags & REQ_FAILED) mapped = false; @@ -1207,7 +1218,7 @@ static void dm_complete_request(struct request *rq, int error) * Complete the not-mapped clone and the original request with the error status * through softirq context. * Target's rq_end_io() function isn't called. - * This may be used when the target's map_rq() function fails. + * This may be used when the target's map_rq() or clone_and_map_rq() functions fail. */ static void dm_kill_unmapped_request(struct request *rq, int error) { @@ -1222,13 +1233,15 @@ static void end_clone_request(struct request *clone, int error) { struct dm_rq_target_io *tio = clone->end_io_data; - /* - * For just cleaning up the information of the queue in which - * the clone was dispatched. - * The clone is *NOT* freed actually here because it is alloced from - * dm own mempool and REQ_ALLOCED isn't set in clone->cmd_flags. - */ - __blk_put_request(clone->q, clone); + if (!clone->q->mq_ops) { + /* + * For just cleaning up the information of the queue in which + * the clone was dispatched. + * The clone is *NOT* freed actually here because it is alloced + * from dm own mempool (REQ_ALLOCED isn't set). + */ + __blk_put_request(clone->q, clone); + } /* * Actual request completion is done in a softirq context which doesn't @@ -1789,6 +1802,8 @@ static struct dm_rq_target_io *prep_tio(struct request *rq, struct mapped_device *md, gfp_t gfp_mask) { struct dm_rq_target_io *tio; + int srcu_idx; + struct dm_table *table; tio = alloc_rq_tio(md, gfp_mask); if (!tio) @@ -1802,10 +1817,15 @@ static struct dm_rq_target_io *prep_tio(struct request *rq, memset(&tio->info, 0, sizeof(tio->info)); init_kthread_work(&tio->work, map_tio_request); - if (!clone_rq(rq, md, tio, gfp_mask)) { - free_rq_tio(tio); - return NULL; + table = dm_get_live_table(md, &srcu_idx); + if (!dm_table_mq_request_based(table)) { + if (!clone_rq(rq, md, tio, gfp_mask)) { + dm_put_live_table(md, srcu_idx); + free_rq_tio(tio); + return NULL; + } } + dm_put_live_table(md, srcu_idx); return tio; } @@ -1835,17 +1855,36 @@ static int dm_prep_fn(struct request_queue *q, struct request *rq) /* * Returns: - * 0 : the request has been processed (not requeued) - * !0 : the request has been requeued + * 0 : the request has been processed + * DM_MAPIO_REQUEUE : the original request needs to be requeued + * < 0 : the request was completed due to failure */ static int map_request(struct dm_target *ti, struct request *rq, struct mapped_device *md) { - int r, requeued = 0; + int r; struct dm_rq_target_io *tio = rq->special; - struct request *clone = tio->clone; + struct request *clone = NULL; + + if (tio->clone) { + clone = tio->clone; + r = ti->type->map_rq(ti, clone, &tio->info); + } else { + r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone); + if (r < 0) { + /* The target wants to complete the I/O */ + dm_kill_unmapped_request(rq, r); + return r; + } + if (IS_ERR(clone)) + return DM_MAPIO_REQUEUE; + if (setup_clone(clone, rq, tio, GFP_KERNEL)) { + /* -ENOMEM */ + ti->type->release_clone_rq(clone); + return DM_MAPIO_REQUEUE; + } + } - r = ti->type->map_rq(ti, clone, &tio->info); switch (r) { case DM_MAPIO_SUBMITTED: /* The target has taken the I/O to submit by itself later */ @@ -1859,7 +1898,6 @@ static int map_request(struct dm_target *ti, struct request *rq, case DM_MAPIO_REQUEUE: /* The target wants to requeue the I/O */ dm_requeue_unmapped_request(clone); - requeued = 1; break; default: if (r > 0) { @@ -1869,17 +1907,20 @@ static int map_request(struct dm_target *ti, struct request *rq, /* The target wants to complete the I/O */ dm_kill_unmapped_request(rq, r); - break; + return r; } - return requeued; + return 0; } static void map_tio_request(struct kthread_work *work) { struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work); + struct request *rq = tio->orig; + struct mapped_device *md = tio->md; - map_request(tio->ti, tio->orig, tio->md); + if (map_request(tio->ti, rq, md) == DM_MAPIO_REQUEUE) + dm_requeue_unmapped_original_request(md, rq); } static void dm_start_request(struct mapped_device *md, struct request *orig) @@ -2459,6 +2500,14 @@ unsigned dm_get_md_type(struct mapped_device *md) return md->type; } +static bool dm_md_type_request_based(struct mapped_device *md) +{ + unsigned table_type = dm_get_md_type(md); + + return (table_type == DM_TYPE_REQUEST_BASED || + table_type == DM_TYPE_MQ_REQUEST_BASED); +} + struct target_type *dm_get_immutable_target_type(struct mapped_device *md) { return md->immutable_target_type; @@ -2511,8 +2560,7 @@ static int dm_init_request_based_queue(struct mapped_device *md) */ int dm_setup_md_queue(struct mapped_device *md) { - if ((dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) && - !dm_init_request_based_queue(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; } @@ -3184,27 +3232,35 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, u { struct dm_md_mempools *pools = kzalloc(sizeof(*pools), GFP_KERNEL); struct kmem_cache *cachep; - unsigned int pool_size; + unsigned int pool_size = 0; unsigned int front_pad; if (!pools) return NULL; - if (type == DM_TYPE_BIO_BASED) { + switch (type) { + case DM_TYPE_BIO_BASED: cachep = _io_cache; pool_size = dm_get_reserved_bio_based_ios(); front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone); - } else if (type == DM_TYPE_REQUEST_BASED) { - cachep = _rq_tio_cache; + break; + case DM_TYPE_REQUEST_BASED: pool_size = dm_get_reserved_rq_based_ios(); pools->rq_pool = mempool_create_slab_pool(pool_size, _rq_cache); if (!pools->rq_pool) goto out; + /* fall through to setup remaining rq-based pools */ + case DM_TYPE_MQ_REQUEST_BASED: + cachep = _rq_tio_cache; + if (!pool_size) + pool_size = dm_get_reserved_rq_based_ios(); front_pad = offsetof(struct dm_rq_clone_bio_info, clone); /* per_bio_data_size is not used. See __bind_mempools(). */ WARN_ON(per_bio_data_size != 0); - } else + break; + default: goto out; + } pools->io_pool = mempool_create_slab_pool(pool_size, cachep); if (!pools->io_pool) diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 84b0f9e4ba6c..84d79784b866 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -34,9 +34,10 @@ /* * Type of table and mapped_device's mempool */ -#define DM_TYPE_NONE 0 -#define DM_TYPE_BIO_BASED 1 -#define DM_TYPE_REQUEST_BASED 2 +#define DM_TYPE_NONE 0 +#define DM_TYPE_BIO_BASED 1 +#define DM_TYPE_REQUEST_BASED 2 +#define DM_TYPE_MQ_REQUEST_BASED 3 /* * List of devices that a metadevice uses and should open/close. @@ -73,6 +74,7 @@ int dm_table_any_busy_target(struct dm_table *t); unsigned dm_table_get_type(struct dm_table *t); struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); bool dm_table_request_based(struct dm_table *t); +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); diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 19296fba58e8..2646aed1d3fe 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -48,6 +48,11 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti); typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone, union map_info *map_context); +typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti, + struct request *rq, + union map_info *map_context, + struct request **clone); +typedef void (*dm_release_clone_request_fn) (struct request *clone); /* * Returns: @@ -143,6 +148,8 @@ struct target_type { dm_dtr_fn dtr; dm_map_fn map; dm_map_request_fn map_rq; + dm_clone_and_map_request_fn clone_and_map_rq; + dm_release_clone_request_fn release_clone_rq; dm_endio_fn end_io; dm_request_endio_fn rq_end_io; dm_presuspend_fn presuspend; diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h index a570d7b5796c..889f3a5b7b18 100644 --- a/include/uapi/linux/dm-ioctl.h +++ b/include/uapi/linux/dm-ioctl.h @@ -267,9 +267,9 @@ enum { #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 29 +#define DM_VERSION_MINOR 30 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2014-10-28)" +#define DM_VERSION_EXTRA "-ioctl (2014-12-22)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ |