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author | Jens Axboe <axboe@fb.com> | 2017-02-17 14:08:19 -0700 |
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committer | Jens Axboe <axboe@fb.com> | 2017-02-17 14:08:19 -0700 |
commit | 818551e2b2c662a1b26de6b4f7d6b8411a838d18 (patch) | |
tree | f38b4c951df4d33db81ae7b7765a56bce491c2a8 /drivers/md/dm-rq.c | |
parent | 6010720da8aab51f33beee63b73cf88016e9b250 (diff) | |
parent | 7520872c0cf4d3df6d74242c6edfb9e70a47df4d (diff) | |
download | op-kernel-dev-818551e2b2c662a1b26de6b4f7d6b8411a838d18.zip op-kernel-dev-818551e2b2c662a1b26de6b4f7d6b8411a838d18.tar.gz |
Merge branch 'for-4.11/next' into for-4.11/linus-merge
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/md/dm-rq.c')
-rw-r--r-- | drivers/md/dm-rq.c | 268 |
1 files changed, 57 insertions, 211 deletions
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 6e702fc..67d76f2 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -109,28 +109,6 @@ void dm_stop_queue(struct request_queue *q) dm_mq_stop_queue(q); } -static struct dm_rq_target_io *alloc_old_rq_tio(struct mapped_device *md, - gfp_t gfp_mask) -{ - return mempool_alloc(md->io_pool, gfp_mask); -} - -static void free_old_rq_tio(struct dm_rq_target_io *tio) -{ - mempool_free(tio, tio->md->io_pool); -} - -static struct request *alloc_old_clone_request(struct mapped_device *md, - gfp_t gfp_mask) -{ - return mempool_alloc(md->rq_pool, gfp_mask); -} - -static void free_old_clone_request(struct mapped_device *md, struct request *rq) -{ - mempool_free(rq, md->rq_pool); -} - /* * Partial completion handling for request-based dm */ @@ -185,7 +163,7 @@ static void end_clone_bio(struct bio *clone) static struct dm_rq_target_io *tio_from_request(struct request *rq) { - return (rq->q->mq_ops ? blk_mq_rq_to_pdu(rq) : rq->special); + return blk_mq_rq_to_pdu(rq); } static void rq_end_stats(struct mapped_device *md, struct request *orig) @@ -233,31 +211,6 @@ static void rq_completed(struct mapped_device *md, int rw, bool run_queue) dm_put(md); } -static void free_rq_clone(struct request *clone) -{ - struct dm_rq_target_io *tio = clone->end_io_data; - struct mapped_device *md = tio->md; - - blk_rq_unprep_clone(clone); - - /* - * It is possible for a clone_old_rq() allocated clone to - * get passed in -- it may not yet have a request_queue. - * This is known to occur if the error target replaces - * a multipath target that has a request_fn queue stacked - * on blk-mq queue(s). - */ - if (clone->q && clone->q->mq_ops) - /* stacked on blk-mq queue(s) */ - tio->ti->type->release_clone_rq(clone); - else if (!md->queue->mq_ops) - /* request_fn queue stacked on request_fn queue(s) */ - free_old_clone_request(md, clone); - - if (!md->queue->mq_ops) - free_old_rq_tio(tio); -} - /* * Complete the clone and the original request. * Must be called without clone's queue lock held, @@ -270,20 +223,9 @@ static void dm_end_request(struct request *clone, int error) struct mapped_device *md = tio->md; struct request *rq = tio->orig; - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { - rq->errors = clone->errors; - rq->resid_len = clone->resid_len; - - if (rq->sense) - /* - * We are using the sense buffer of the original - * request. - * So setting the length of the sense data is enough. - */ - rq->sense_len = clone->sense_len; - } + blk_rq_unprep_clone(clone); + tio->ti->type->release_clone_rq(clone); - free_rq_clone(clone); rq_end_stats(md, rq); if (!rq->q->mq_ops) blk_end_request_all(rq, error); @@ -292,22 +234,6 @@ static void dm_end_request(struct request *clone, int error) rq_completed(md, rw, true); } -static void dm_unprep_request(struct request *rq) -{ - struct dm_rq_target_io *tio = tio_from_request(rq); - struct request *clone = tio->clone; - - if (!rq->q->mq_ops) { - rq->special = NULL; - rq->rq_flags &= ~RQF_DONTPREP; - } - - if (clone) - free_rq_clone(clone); - else if (!tio->md->queue->mq_ops) - free_old_rq_tio(tio); -} - /* * Requeue the original request of a clone. */ @@ -346,7 +272,10 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_ int rw = rq_data_dir(rq); rq_end_stats(md, rq); - dm_unprep_request(rq); + if (tio->clone) { + blk_rq_unprep_clone(tio->clone); + tio->ti->type->release_clone_rq(tio->clone); + } if (!rq->q->mq_ops) dm_old_requeue_request(rq); @@ -401,14 +330,11 @@ static void dm_softirq_done(struct request *rq) if (!clone) { rq_end_stats(tio->md, rq); rw = rq_data_dir(rq); - if (!rq->q->mq_ops) { + if (!rq->q->mq_ops) blk_end_request_all(rq, tio->error); - rq_completed(tio->md, rw, false); - free_old_rq_tio(tio); - } else { + else blk_mq_end_request(rq, tio->error); - rq_completed(tio->md, rw, false); - } + rq_completed(tio->md, rw, false); return; } @@ -452,16 +378,6 @@ static void end_clone_request(struct request *clone, int error) { struct dm_rq_target_io *tio = clone->end_io_data; - 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 (RQF_ALLOCED isn't set). - */ - __blk_put_request(clone->q, clone); - } - /* * Actual request completion is done in a softirq context which doesn't * hold the clone's queue lock. Otherwise, deadlock could occur because: @@ -511,9 +427,6 @@ static int setup_clone(struct request *clone, struct request *rq, if (r) return r; - clone->cmd = rq->cmd; - clone->cmd_len = rq->cmd_len; - clone->sense = rq->sense; clone->end_io = end_clone_request; clone->end_io_data = tio; @@ -522,28 +435,6 @@ static int setup_clone(struct request *clone, struct request *rq, return 0; } -static struct request *clone_old_rq(struct request *rq, struct mapped_device *md, - struct dm_rq_target_io *tio, gfp_t gfp_mask) -{ - /* - * Create clone for use with .request_fn request_queue - */ - struct request *clone; - - clone = alloc_old_clone_request(md, gfp_mask); - if (!clone) - return NULL; - - blk_rq_init(NULL, clone); - if (setup_clone(clone, rq, tio, gfp_mask)) { - /* -ENOMEM */ - free_old_clone_request(md, clone); - return NULL; - } - - return clone; -} - static void map_tio_request(struct kthread_work *work); static void init_tio(struct dm_rq_target_io *tio, struct request *rq, @@ -565,60 +456,6 @@ static void init_tio(struct dm_rq_target_io *tio, struct request *rq, kthread_init_work(&tio->work, map_tio_request); } -static struct dm_rq_target_io *dm_old_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_old_rq_tio(md, gfp_mask); - if (!tio) - return NULL; - - init_tio(tio, rq, md); - - table = dm_get_live_table(md, &srcu_idx); - /* - * Must clone a request if this .request_fn DM device - * is stacked on .request_fn device(s). - */ - if (!dm_table_all_blk_mq_devices(table)) { - if (!clone_old_rq(rq, md, tio, gfp_mask)) { - dm_put_live_table(md, srcu_idx); - free_old_rq_tio(tio); - return NULL; - } - } - dm_put_live_table(md, srcu_idx); - - return tio; -} - -/* - * Called with the queue lock held. - */ -static int dm_old_prep_fn(struct request_queue *q, struct request *rq) -{ - struct mapped_device *md = q->queuedata; - struct dm_rq_target_io *tio; - - if (unlikely(rq->special)) { - DMWARN("Already has something in rq->special."); - return BLKPREP_KILL; - } - - tio = dm_old_prep_tio(rq, md, GFP_ATOMIC); - if (!tio) - return BLKPREP_DEFER; - - rq->special = tio; - rq->rq_flags |= RQF_DONTPREP; - - return BLKPREP_OK; -} - /* * Returns: * DM_MAPIO_* : the request has been processed as indicated @@ -633,31 +470,18 @@ static int map_request(struct dm_rq_target_io *tio) struct request *rq = tio->orig; struct request *clone = NULL; - if (tio->clone) { - clone = tio->clone; - r = ti->type->map_rq(ti, clone, &tio->info); - if (r == DM_MAPIO_DELAY_REQUEUE) - return DM_MAPIO_REQUEUE; /* .request_fn requeue is always immediate */ - } 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 (r == DM_MAPIO_REMAPPED && - setup_clone(clone, rq, tio, GFP_ATOMIC)) { - /* -ENOMEM */ - ti->type->release_clone_rq(clone); - return DM_MAPIO_REQUEUE; - } - } - + r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone); switch (r) { case DM_MAPIO_SUBMITTED: /* The target has taken the I/O to submit by itself later */ break; case DM_MAPIO_REMAPPED: + if (setup_clone(clone, rq, tio, GFP_ATOMIC)) { + /* -ENOMEM */ + ti->type->release_clone_rq(clone); + return DM_MAPIO_REQUEUE; + } + /* The target has remapped the I/O so dispatch it */ trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)), blk_rq_pos(rq)); @@ -716,6 +540,29 @@ static void dm_start_request(struct mapped_device *md, struct request *orig) dm_get(md); } +static int __dm_rq_init_rq(struct mapped_device *md, struct request *rq) +{ + struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); + + /* + * Must initialize md member of tio, otherwise it won't + * be available in dm_mq_queue_rq. + */ + tio->md = md; + + if (md->init_tio_pdu) { + /* target-specific per-io data is immediately after the tio */ + tio->info.ptr = tio + 1; + } + + return 0; +} + +static int dm_rq_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp) +{ + return __dm_rq_init_rq(q->rq_alloc_data, rq); +} + static void map_tio_request(struct kthread_work *work) { struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work); @@ -814,6 +661,7 @@ static void dm_old_request_fn(struct request_queue *q) dm_start_request(md, rq); tio = tio_from_request(rq); + init_tio(tio, rq, md); /* Establish tio->ti before queuing work (map_tio_request) */ tio->ti = ti; kthread_queue_work(&md->kworker, &tio->work); @@ -824,10 +672,23 @@ static void dm_old_request_fn(struct request_queue *q) /* * Fully initialize a .request_fn request-based queue. */ -int dm_old_init_request_queue(struct mapped_device *md) +int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t) { + struct dm_target *immutable_tgt; + /* Fully initialize the queue */ - if (!blk_init_allocated_queue(md->queue, dm_old_request_fn, NULL)) + md->queue->cmd_size = sizeof(struct dm_rq_target_io); + md->queue->rq_alloc_data = md; + md->queue->request_fn = dm_old_request_fn; + md->queue->init_rq_fn = dm_rq_init_rq; + + immutable_tgt = dm_table_get_immutable_target(t); + if (immutable_tgt && immutable_tgt->per_io_data_size) { + /* any target-specific per-io data is immediately after the tio */ + md->queue->cmd_size += immutable_tgt->per_io_data_size; + md->init_tio_pdu = true; + } + if (blk_init_allocated_queue(md->queue) < 0) return -EINVAL; /* disable dm_old_request_fn's merge heuristic by default */ @@ -835,7 +696,6 @@ int dm_old_init_request_queue(struct mapped_device *md) dm_init_normal_md_queue(md); blk_queue_softirq_done(md->queue, dm_softirq_done); - blk_queue_prep_rq(md->queue, dm_old_prep_fn); /* Initialize the request-based DM worker thread */ kthread_init_worker(&md->kworker); @@ -856,21 +716,7 @@ static int dm_mq_init_request(void *data, struct request *rq, unsigned int hctx_idx, unsigned int request_idx, unsigned int numa_node) { - struct mapped_device *md = data; - struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); - - /* - * Must initialize md member of tio, otherwise it won't - * be available in dm_mq_queue_rq. - */ - tio->md = md; - - if (md->init_tio_pdu) { - /* target-specific per-io data is immediately after the tio */ - tio->info.ptr = tio + 1; - } - - return 0; + return __dm_rq_init_rq(data, rq); } static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, |