diff options
| -rw-r--r-- | block/bfq-iosched.c | 1 | ||||
| -rw-r--r-- | block/blk-core.c | 1709 | ||||
| -rw-r--r-- | block/blk-exec.c | 20 | ||||
| -rw-r--r-- | block/blk-ioc.c | 33 | ||||
| -rw-r--r-- | block/blk-merge.c | 5 | ||||
| -rw-r--r-- | block/blk-settings.c | 36 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 36 | ||||
| -rw-r--r-- | block/blk.h | 51 | ||||
| -rw-r--r-- | block/elevator.c | 377 | ||||
| -rw-r--r-- | block/kyber-iosched.c | 1 | ||||
| -rw-r--r-- | block/mq-deadline.c | 1 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 93 | ||||
| -rw-r--r-- | include/linux/elevator.h | 90 | ||||
| -rw-r--r-- | include/linux/init.h | 1 | ||||
| -rw-r--r-- | init/do_mounts_initrd.c | 3 | ||||
| -rw-r--r-- | init/initramfs.c | 6 | ||||
| -rw-r--r-- | init/main.c | 12 |
17 files changed, 55 insertions, 2420 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 3a27d31fcda6..44c7e567aa25 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -5745,7 +5745,6 @@ static struct elevator_type iosched_bfq_mq = { .exit_sched = bfq_exit_queue, }, - .uses_mq = true, .icq_size = sizeof(struct bfq_io_cq), .icq_align = __alignof__(struct bfq_io_cq), .elevator_attrs = bfq_attrs, diff --git a/block/blk-core.c b/block/blk-core.c index daaed4dfa719..18538a41a532 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -144,46 +144,6 @@ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_queue_flag_test_and_clear); -static void blk_clear_congested(struct request_list *rl, int sync) -{ -#ifdef CONFIG_CGROUP_WRITEBACK - clear_wb_congested(rl->blkg->wb_congested, sync); -#else - /* - * If !CGROUP_WRITEBACK, all blkg's map to bdi->wb and we shouldn't - * flip its congestion state for events on other blkcgs. - */ - if (rl == &rl->q->root_rl) - clear_wb_congested(rl->q->backing_dev_info->wb.congested, sync); -#endif -} - -static void blk_set_congested(struct request_list *rl, int sync) -{ -#ifdef CONFIG_CGROUP_WRITEBACK - set_wb_congested(rl->blkg->wb_congested, sync); -#else - /* see blk_clear_congested() */ - if (rl == &rl->q->root_rl) - set_wb_congested(rl->q->backing_dev_info->wb.congested, sync); -#endif -} - -void blk_queue_congestion_threshold(struct request_queue *q) -{ - int nr; - - nr = q->nr_requests - (q->nr_requests / 8) + 1; - if (nr > q->nr_requests) - nr = q->nr_requests; - q->nr_congestion_on = nr; - - nr = q->nr_requests - (q->nr_requests / 8) - (q->nr_requests / 16) - 1; - if (nr < 1) - nr = 1; - q->nr_congestion_off = nr; -} - void blk_rq_init(struct request_queue *q, struct request *rq) { memset(rq, 0, sizeof(*rq)); @@ -292,99 +252,6 @@ void blk_dump_rq_flags(struct request *rq, char *msg) } EXPORT_SYMBOL(blk_dump_rq_flags); -static void blk_delay_work(struct work_struct *work) -{ - struct request_queue *q; - - q = container_of(work, struct request_queue, delay_work.work); - spin_lock_irq(q->queue_lock); - __blk_run_queue(q); - spin_unlock_irq(q->queue_lock); -} - -/** - * blk_delay_queue - restart queueing after defined interval - * @q: The &struct request_queue in question - * @msecs: Delay in msecs - * - * Description: - * Sometimes queueing needs to be postponed for a little while, to allow - * resources to come back. This function will make sure that queueing is - * restarted around the specified time. - */ -void blk_delay_queue(struct request_queue *q, unsigned long msecs) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - if (likely(!blk_queue_dead(q))) - queue_delayed_work(kblockd_workqueue, &q->delay_work, - msecs_to_jiffies(msecs)); -} -EXPORT_SYMBOL(blk_delay_queue); - -/** - * blk_start_queue_async - asynchronously restart a previously stopped queue - * @q: The &struct request_queue in question - * - * Description: - * blk_start_queue_async() will clear the stop flag on the queue, and - * ensure that the request_fn for the queue is run from an async - * context. - **/ -void blk_start_queue_async(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - queue_flag_clear(QUEUE_FLAG_STOPPED, q); - blk_run_queue_async(q); -} -EXPORT_SYMBOL(blk_start_queue_async); - -/** - * blk_start_queue - restart a previously stopped queue - * @q: The &struct request_queue in question - * - * Description: - * blk_start_queue() will clear the stop flag on the queue, and call - * the request_fn for the queue if it was in a stopped state when - * entered. Also see blk_stop_queue(). - **/ -void blk_start_queue(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - queue_flag_clear(QUEUE_FLAG_STOPPED, q); - __blk_run_queue(q); -} -EXPORT_SYMBOL(blk_start_queue); - -/** - * blk_stop_queue - stop a queue - * @q: The &struct request_queue in question - * - * Description: - * The Linux block layer assumes that a block driver will consume all - * entries on the request queue when the request_fn strategy is called. - * Often this will not happen, because of hardware limitations (queue - * depth settings). If a device driver gets a 'queue full' response, - * or if it simply chooses not to queue more I/O at one point, it can - * call this function to prevent the request_fn from being called until - * the driver has signalled it's ready to go again. This happens by calling - * blk_start_queue() to restart queue operations. - **/ -void blk_stop_queue(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - cancel_delayed_work(&q->delay_work); - queue_flag_set(QUEUE_FLAG_STOPPED, q); -} -EXPORT_SYMBOL(blk_stop_queue); - /** * blk_sync_queue - cancel any pending callbacks on a queue * @q: the queue @@ -415,8 +282,6 @@ void blk_sync_queue(struct request_queue *q) cancel_delayed_work_sync(&q->requeue_work); queue_for_each_hw_ctx(q, hctx, i) cancel_delayed_work_sync(&hctx->run_work); - } else { - cancel_delayed_work_sync(&q->delay_work); } } EXPORT_SYMBOL(blk_sync_queue); @@ -442,250 +307,12 @@ void blk_clear_pm_only(struct request_queue *q) } EXPORT_SYMBOL_GPL(blk_clear_pm_only); -/** - * __blk_run_queue_uncond - run a queue whether or not it has been stopped - * @q: The queue to run - * - * Description: - * Invoke request handling on a queue if there are any pending requests. - * May be used to restart request handling after a request has completed. - * This variant runs the queue whether or not the queue has been - * stopped. Must be called with the queue lock held and interrupts - * disabled. See also @blk_run_queue. - */ -inline void __blk_run_queue_uncond(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - if (unlikely(blk_queue_dead(q))) - return; - - /* - * Some request_fn implementations, e.g. scsi_request_fn(), unlock - * the queue lock internally. As a result multiple threads may be - * running such a request function concurrently. Keep track of the - * number of active request_fn invocations such that blk_drain_queue() - * can wait until all these request_fn calls have finished. - */ - q->request_fn_active++; - q->request_fn(q); - q->request_fn_active--; -} -EXPORT_SYMBOL_GPL(__blk_run_queue_uncond); - -/** - * __blk_run_queue - run a single device queue - * @q: The queue to run - * - * Description: - * See @blk_run_queue. - */ -void __blk_run_queue(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - if (unlikely(blk_queue_stopped(q))) - return; - - __blk_run_queue_uncond(q); -} -EXPORT_SYMBOL(__blk_run_queue); - -/** - * blk_run_queue_async - run a single device queue in workqueue context - * @q: The queue to run - * - * Description: - * Tells kblockd to perform the equivalent of @blk_run_queue on behalf - * of us. - * - * Note: - * Since it is not allowed to run q->delay_work after blk_cleanup_queue() - * has canceled q->delay_work, callers must hold the queue lock to avoid - * race conditions between blk_cleanup_queue() and blk_run_queue_async(). - */ -void blk_run_queue_async(struct request_queue *q) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - if (likely(!blk_queue_stopped(q) && !blk_queue_dead(q))) - mod_delayed_work(kblockd_workqueue, &q->delay_work, 0); -} -EXPORT_SYMBOL(blk_run_queue_async); - -/** - * blk_run_queue - run a single device queue - * @q: The queue to run - * - * Description: - * Invoke request handling on this queue, if it has pending work to do. - * May be used to restart queueing when a request has completed. - */ -void blk_run_queue(struct request_queue *q) -{ - unsigned long flags; - - WARN_ON_ONCE(q->mq_ops); - - spin_lock_irqsave(q->queue_lock, flags); - __blk_run_queue(q); - spin_unlock_irqrestore(q->queue_lock, flags); -} -EXPORT_SYMBOL(blk_run_queue); - void blk_put_queue(struct request_queue *q) { kobject_put(&q->kobj); } EXPORT_SYMBOL(blk_put_queue); -/** - * __blk_drain_queue - drain requests from request_queue - * @q: queue to drain - * @drain_all: whether to drain all requests or only the ones w/ ELVPRIV - * - * Drain requests from @q. If @drain_all is set, all requests are drained. - * If not, only ELVPRIV requests are drained. The caller is responsible - * for ensuring that no new requests which need to be drained are queued. - */ -static void __blk_drain_queue(struct request_queue *q, bool drain_all) - __releases(q->queue_lock) - __acquires(q->queue_lock) -{ - int i; - - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - while (true) { - bool drain = false; - - /* - * The caller might be trying to drain @q before its - * elevator is initialized. - */ - if (q->elevator) - elv_drain_elevator(q); - - blkcg_drain_queue(q); - - /* - * This function might be called on a queue which failed - * driver init after queue creation or is not yet fully - * active yet. Some drivers (e.g. fd and loop) get unhappy - * in such cases. Kick queue iff dispatch queue has - * something on it and @q has request_fn set. - */ - if (!list_empty(&q->queue_head) && q->request_fn) - __blk_run_queue(q); - - drain |= q->nr_rqs_elvpriv; - drain |= q->request_fn_active; - - /* - * Unfortunately, requests are queued at and tracked from - * multiple places and there's no single counter which can - * be drained. Check all the queues and counters. - */ - if (drain_all) { - struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); - drain |= !list_empty(&q->queue_head); - for (i = 0; i < 2; i++) { - drain |= q->nr_rqs[i]; - drain |= q->in_flight[i]; - if (fq) - drain |= !list_empty(&fq->flush_queue[i]); - } - } - - if (!drain) - break; - - spin_unlock_irq(q->queue_lock); - - msleep(10); - - spin_lock_irq(q->queue_lock); - } - - /* - * With queue marked dead, any woken up waiter will fail the - * allocation path, so the wakeup chaining is lost and we're - * left with hung waiters. We need to wake up those waiters. - */ - if (q->request_fn) { - struct request_list *rl; - - blk_queue_for_each_rl(rl, q) - for (i = 0; i < ARRAY_SIZE(rl->wait); i++) - wake_up_all(&rl->wait[i]); - } -} - -void blk_drain_queue(struct request_queue *q) -{ - spin_lock_irq(q->queue_lock); - __blk_drain_queue(q, true); - spin_unlock_irq(q->queue_lock); -} - -/** - * blk_queue_bypass_start - enter queue bypass mode - * @q: queue of interest - * - * In bypass mode, only the dispatch FIFO queue of @q is used. This - * function makes @q enter bypass mode and drains all requests which were - * throttled or issued before. On return, it's guaranteed that no request - * is being throttled or has ELVPRIV set and blk_queue_bypass() %true - * inside queue or RCU read lock. - */ -void blk_queue_bypass_start(struct request_queue *q) -{ - WARN_ON_ONCE(q->mq_ops); - - spin_lock_irq(q->queue_lock); - q->bypass_depth++; - queue_flag_set(QUEUE_FLAG_BYPASS, q); - spin_unlock_irq(q->queue_lock); - - /* - * Queues start drained. Skip actual draining till init is - * complete. This avoids lenghty delays during queue init which - * can happen many times during boot. - */ - if (blk_queue_init_done(q)) { - spin_lock_irq(q->queue_lock); - __blk_drain_queue(q, false); - spin_unlock_irq(q->queue_lock); - - /* ensure blk_queue_bypass() is %true inside RCU read lock */ - synchronize_rcu(); - } -} -EXPORT_SYMBOL_GPL(blk_queue_bypass_start); - -/** - * blk_queue_bypass_end - leave queue bypass mode - * @q: queue of interest - * - * Leave bypass mode and restore the normal queueing behavior. - * - * Note: although blk_queue_bypass_start() is only called for blk-sq queues, - * this function is called for both blk-sq and blk-mq queues. - */ -void blk_queue_bypass_end(struct request_queue *q) -{ - spin_lock_irq(q->queue_lock); - if (!--q->bypass_depth) - queue_flag_clear(QUEUE_FLAG_BYPASS, q); - WARN_ON_ONCE(q->bypass_depth < 0); - spin_unlock_irq(q->queue_lock); -} -EXPORT_SYMBOL_GPL(blk_queue_bypass_end); - void blk_set_queue_dying(struct request_queue *q) { blk_queue_flag_set(QUEUE_FLAG_DYING, q); @@ -699,18 +326,6 @@ void blk_set_queue_dying(struct request_queue *q) if (q->mq_ops) blk_mq_wake_waiters(q); - else { - struct request_list *rl; - - spin_lock_irq(q->queue_lock); - blk_queue_for_each_rl(rl, q) { - if (rl->rq_pool) { - wake_up_all(&rl->wait[BLK_RW_SYNC]); - wake_up_all(&rl->wait[BLK_RW_ASYNC]); - } - } - spin_unlock_irq(q->queue_lock); - } /* Make blk_queue_enter() reexamine the DYING flag. */ wake_up_all(&q->mq_freeze_wq); @@ -822,6 +437,7 @@ void blk_cleanup_queue(struct request_queue *q) if (q->mq_ops) blk_mq_free_queue(q); + percpu_ref_exit(&q->q_usage_counter); spin_lock_irq(lock); @@ -1013,8 +629,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, INIT_LIST_HEAD(&q->queue_head); q->last_merge = NULL; - q->end_sector = 0; - q->boundary_rq = NULL; q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask); if (q->id < 0) @@ -1047,7 +661,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, #ifdef CONFIG_BLK_CGROUP INIT_LIST_HEAD(&q->blkg_list); #endif - INIT_DELAYED_WORK(&q->delay_work, blk_delay_work); kobject_init(&q->kobj, &blk_queue_ktype); @@ -1100,105 +713,6 @@ fail_q: } EXPORT_SYMBOL(blk_alloc_queue_node); -/** - * blk_init_queue - prepare a request queue for use with a block device - * @rfn: The function to be called to process requests that have been - * placed on the queue. - * @lock: Request queue spin lock - * - * Description: - * If a block device wishes to use the standard request handling procedures, - * which sorts requests and coalesces adjacent requests, then it must - * call blk_init_queue(). The function @rfn will be called when there - * are requests on the queue that need to be processed. If the device - * supports plugging, then @rfn may not be called immediately when requests - * are available on the queue, but may be called at some time later instead. - * Plugged queues are generally unplugged when a buffer belonging to one - * of the requests on the queue is needed, or due to memory pressure. - * - * @rfn is not required, or even expected, to remove all requests off the - * queue, but only as many as it can handle at a time. If it does leave - * requests on the queue, it is responsible for arranging that the requests - * get dealt with eventually. - * - * The queue spin lock must be held while manipulating the requests on the - * request queue; this lock will be taken also from interrupt context, so irq - * disabling is needed for it. - * - * Function returns a pointer to the initialized request queue, or %NULL if - * it didn't succeed. - * - * Note: - * blk_init_queue() must be paired with a blk_cleanup_queue() call - * when the block device is deactivated (such as at module unload). - **/ - -struct request_queue *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock) -{ - return blk_init_queue_node(rfn, lock, NUMA_NO_NODE); -} -EXPORT_SYMBOL(blk_init_queue); - -struct request_queue * -blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) -{ - struct request_queue *q; - - q = blk_alloc_queue_node(GFP_KERNEL, node_id, lock); - if (!q) - return NULL; - - q->request_fn = rfn; - if (blk_init_allocated_queue(q) < 0) { - blk_cleanup_queue(q); - return NULL; - } - - return q; -} -EXPORT_SYMBOL(blk_init_queue_node); - -static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio); - - -int blk_init_allocated_queue(struct request_queue *q) -{ - WARN_ON_ONCE(q->mq_ops); - - q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, q->cmd_size, GFP_KERNEL); - if (!q->fq) - return -ENOMEM; - - if (q->init_rq_fn && q->init_rq_fn(q, q->fq->flush_rq, GFP_KERNEL)) - goto out_free_flush_queue; - - if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) - goto out_exit_flush_rq; - - INIT_WORK(&q->timeout_work, blk_timeout_work); - q->queue_flags |= QUEUE_FLAG_DEFAULT; - - /* - * This also sets hw/phys segments, boundary and size - */ - blk_queue_make_request(q, blk_queue_bio); - - q->sg_reserved_size = INT_MAX; - - if (elevator_init(q)) - goto out_exit_flush_rq; - return 0; - -out_exit_flush_rq: - if (q->exit_rq_fn) - q->exit_rq_fn(q, q->fq->flush_rq); -out_free_flush_queue: - blk_free_flush_queue(q->fq); - q->fq = NULL; - return -ENOMEM; -} -EXPORT_SYMBOL(blk_init_allocated_queue); - bool blk_get_queue(struct request_queue *q) { if (likely(!blk_queue_dying(q))) { @@ -1210,406 +724,6 @@ bool blk_get_queue(struct request_queue *q) } EXPORT_SYMBOL(blk_get_queue); -static inline void blk_free_request(struct request_list *rl, struct request *rq) -{ - if (rq->rq_flags & RQF_ELVPRIV) { - elv_put_request(rl->q, rq); - if (rq->elv.icq) - put_io_context(rq->elv.icq->ioc); - } - - mempool_free(rq, rl->rq_pool); -} - -/* - * ioc_batching returns true if the ioc is a valid batching request and - * should be given priority access to a request. - */ -static inline int ioc_batching(struct request_queue *q, struct io_context *ioc) -{ - if (!ioc) - return 0; - - /* - * Make sure the process is able to allocate at least 1 request - * even if the batch times out, otherwise we could theoretically - * lose wakeups. - */ - return ioc->nr_batch_requests == q->nr_batching || - (ioc->nr_batch_requests > 0 - && time_before(jiffies, ioc->last_waited + BLK_BATCH_TIME)); -} - -/* - * ioc_set_batching sets ioc to be a new "batcher" if it is not one. This - * will cause the process to be a "batcher" on all queues in the system. This - * is the behaviour we want though - once it gets a wakeup it should be given - * a nice run. - */ -static void ioc_set_batching(struct request_queue *q, struct io_context *ioc) -{ - if (!ioc || ioc_batching(q, ioc)) - return; - - ioc->nr_batch_requests = q->nr_batching; - ioc->last_waited = jiffies; -} - -static void __freed_request(struct request_list *rl, int sync) -{ - struct request_queue *q = rl->q; - - if (rl->count[sync] < queue_congestion_off_threshold(q)) - blk_clear_congested(rl, sync); - - if (rl->count[sync] + 1 <= q->nr_requests) { - if (waitqueue_active(&rl->wait[sync])) - wake_up(&rl->wait[sync]); - - blk_clear_rl_full(rl, sync); - } -} - -/* - * A request has just been released. Account for it, update the full and - * congestion status, wake up any waiters. Called under q->queue_lock. - */ -static void freed_request(struct request_list *rl, bool sync, - req_flags_t rq_flags) -{ - struct request_queue *q = rl->q; - - q->nr_rqs[sync]--; - rl->count[sync]--; - if (rq_flags & RQF_ELVPRIV) - q->nr_rqs_elvpriv--; - - __freed_request(rl, sync); - - if (unlikely(rl->starved[sync ^ 1])) - __freed_request(rl, sync ^ 1); -} - -int blk_update_nr_requests(struct request_queue *q, unsigned int nr) -{ - struct request_list *rl; - int on_thresh, off_thresh; - - WARN_ON_ONCE(q->mq_ops); - - spin_lock_irq(q->queue_lock); - q->nr_requests = nr; - blk_queue_congestion_threshold(q); - on_thresh = queue_congestion_on_threshold(q); - off_thresh = queue_congestion_off_threshold(q); - - blk_queue_for_each_rl(rl, q) { - if (rl->count[BLK_RW_SYNC] >= on_thresh) - blk_set_congested(rl, BLK_RW_SYNC); - else if (rl->count[BLK_RW_SYNC] < off_thresh) - blk_clear_congested(rl, BLK_RW_SYNC); - - if (rl->count[BLK_RW_ASYNC] >= on_thresh) - blk_set_congested(rl, BLK_RW_ASYNC); - else if (rl->count[BLK_RW_ASYNC] < off_thresh) - blk_clear_congested(rl, BLK_RW_ASYNC); - - if (rl->count[BLK_RW_SYNC] >= q->nr_requests) { - blk_set_rl_full(rl, BLK_RW_SYNC); - } else { - blk_clear_rl_full(rl, BLK_RW_SYNC); - wake_up(&rl->wait[BLK_RW_SYNC]); - } - - if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) { - blk_set_rl_full(rl, BLK_RW_ASYNC); - } else { - blk_clear_rl_full(rl, BLK_RW_ASYNC); - wake_up(&rl->wait[BLK_RW_ASYNC]); - } - } - - spin_unlock_irq(q->queue_lock); - return 0; -} - -/** - * __get_request - get a free request - * @rl: request list to allocate from - * @op: operation and flags - * @bio: bio to allocate request for (can be %NULL) - * @flags: BLQ_MQ_REQ_* flags - * @gfp_mask: allocator flags - * - * Get a free request from @q. This function may fail under memory - * pressure or if @q is dead. - * - * Must be called with @q->queue_lock held and, - * Returns ERR_PTR on failure, with @q->queue_lock held. - * Returns request pointer on success, with @q->queue_lock *not held*. - */ -static struct request *__get_request(struct request_list *rl, unsigned int op, - struct bio *bio, blk_mq_req_flags_t flags, gfp_t gfp_mask) -{ - struct request_queue *q = rl->q; - struct request *rq; - struct elevator_type *et = q->elevator->type; - struct io_context *ioc = rq_ioc(bio); - struct io_cq *icq = NULL; - const bool is_sync = op_is_sync(op); - int may_queue; - req_flags_t rq_flags = RQF_ALLOCED; - - lockdep_assert_held(q->queue_lock); - - if (unlikely(blk_queue_dying(q))) - return ERR_PTR(-ENODEV); - - may_queue = elv_may_queue(q, op); - if (may_queue == ELV_MQUEUE_NO) - goto rq_starved; - - if (rl->count[is_sync]+1 >= queue_congestion_on_threshold(q)) { - if (rl->count[is_sync]+1 >= q->nr_requests) { - /* - * The queue will fill after this allocation, so set - * it as full, and mark this process as "batching". - * This process will be allowed to complete a batch of - * requests, others will be blocked. - */ - if (!blk_rl_full(rl, is_sync)) { - ioc_set_batching(q, ioc); - blk_set_rl_full(rl, is_sync); - } else { - if (may_queue != ELV_MQUEUE_MUST - && !ioc_batching(q, ioc)) { - /* - * The queue is full and the allocating - * process is not a "batcher", and not - * exempted by the IO scheduler - */ - return ERR_PTR(-ENOMEM); - } - } - } - blk_set_congested(rl, is_sync); - } - - /* - * Only allow batching queuers to allocate up to 50% over the defined - * limit of requests, otherwise we could have thousands of requests - * allocated with any setting of ->nr_requests - */ - if (rl->count[is_sync] >= (3 * q->nr_requests / 2)) - return ERR_PTR(-ENOMEM); - - q->nr_rqs[is_sync]++; - rl->count[is_sync]++; - rl->starved[is_sync] = 0; - - /* - * Decide whether the new request will be managed by elevator. If - * so, mark @rq_flags and increment elvpriv. Non-zero elvpriv will - * prevent the current elevator from being destroyed until the new - * request is freed. This guarantees icq's won't be destroyed and - * makes creating new ones safe. - * - * Flush requests do not use the elevator so skip initialization. - * This allows a request to share the flush and elevator data. - * - * Also, lookup icq while holding queue_lock. If it doesn't exist, - * it will be created after releasing queue_lock. - */ - if (!op_is_flush(op) && !blk_queue_bypass(q)) { - rq_flags |= RQF_ELVPRIV; - q->nr_rqs_elvpriv++; - if (et->icq_cache && ioc) - icq = ioc_lookup_icq(ioc, q); - } - - if (blk_queue_io_stat(q)) - rq_flags |= RQF_IO_STAT; - spin_unlock_irq(q->queue_lock); - - /* allocate and init request */ - rq = mempool_alloc(rl->rq_pool, gfp_mask); - if (!rq) - goto fail_alloc; - - blk_rq_init(q, rq); - blk_rq_set_rl(rq, rl); - rq->cmd_flags = op; - rq->rq_flags = rq_flags; - if (flags & BLK_MQ_REQ_PREEMPT) - rq->rq_flags |= RQF_PREEMPT; - - /* init elvpriv */ - if (rq_flags & RQF_ELVPRIV) { - if (unlikely(et->icq_cache && !icq)) { - if (ioc) - icq = ioc_create_icq(ioc, q, gfp_mask); - if (!icq) - goto fail_elvpriv; - } - - rq->elv.icq = icq; - if (unlikely(elv_set_request(q, rq, bio, gfp_mask))) - goto fail_elvpriv; - - /* @rq->elv.icq holds io_context until @rq is freed */ - if (icq) - get_io_context(icq->ioc); - } -out: - /* - * ioc may be NULL here, and ioc_batching will be false. That's - * OK, if the queue is under the request limit then requests need - * not count toward the nr_batch_requests limit. There will always - * be some limit enforced by BLK_BATCH_TIME. - */ - if (ioc_batching(q, ioc)) - ioc->nr_batch_requests--; - - trace_block_getrq(q, bio, op); - return rq; - -fail_elvpriv: - /* - * elvpriv init failed. ioc, icq and elvpriv aren't mempool backed - * and may fail indefinitely under memory pressure and thus - * shouldn't stall IO. Treat this request as !elvpriv. This will - * disturb iosched and blkcg but weird is bettern than dead. - */ - printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed\n", - __func__, dev_name(q->backing_dev_info->dev)); - - rq->rq_flags &= ~RQF_ELVPRIV; - rq->elv.icq = NULL; - - spin_lock_irq(q->queue_lock); - q->nr_rqs_elvpriv--; - spin_unlock_irq(q->queue_lock); - goto out; - -fail_alloc: - /* - * Allocation failed presumably due to memory. Undo anything we - * might have messed up. - * - * Allocating task should really be put onto the front of the wait - * queue, but this is pretty rare. - */ - spin_lock_irq(q->queue_lock); - freed_request(rl, is_sync, rq_flags); - - /* - * in the very unlikely event that allocation failed and no - * requests for this direction was pending, mark us starved so that - * freeing of a request in the other direction will notice - * us. another possible fix would be to split the rq mempool into - * READ and WRITE - */ -rq_starved: - if (unlikely(rl->count[is_sync] == 0)) - rl->starved[is_sync] = 1; - return ERR_PTR(-ENOMEM); -} - -/** - * get_request - get a free request - * @q: request_queue to allocate request from - * @op: operation and flags - * @bio: bio to allocate request for (can be %NULL) - * @flags: BLK_MQ_REQ_* flags. - * @gfp: allocator flags - * - * Get a free request from @q. If %BLK_MQ_REQ_NOWAIT is set in @flags, - * this function keeps retrying under memory pressure and fails iff @q is dead. - * - * Must be called with @q->queue_lock held and, - * Returns ERR_PTR on failure, with @q->queue_lock held. - * Returns request pointer on success, with @q->queue_lock *not held*. - */ -static struct request *get_request(struct request_queue *q, unsigned int op, - struct bio *bio, blk_mq_req_flags_t flags, gfp_t gfp) -{ - const bool is_sync = op_is_sync(op); - DEFINE_WAIT(wait); - struct request_list *rl; - struct request *rq; - - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - rl = blk_get_rl(q, bio); /* transferred to @rq on success */ -retry: - rq = __get_request(rl, op, bio, flags, gfp); - if (!IS_ERR(rq)) - return rq; - - if (op & REQ_NOWAIT) { - blk_put_rl(rl); - return ERR_PTR(-EAGAIN); - } - - if ((flags & BLK_MQ_REQ_NOWAIT) || unlikely(blk_queue_dying(q))) { - blk_put_rl(rl); - return rq; - } - - /* wait on @rl and retry */ - prepare_to_wait_exclusive(&rl->wait[is_sync], &wait, - TASK_UNINTERRUPTIBLE); - - trace_block_sleeprq(q, bio, op); - - spin_unlock_irq(q->queue_lock); - io_schedule(); - - /* - * After sleeping, we become a "batching" process and will be able - * to allocate at least one request, and up to a big batch of them - * for a small period time. See ioc_batching, ioc_set_batching - */ - ioc_set_batching(q, current->io_context); - - spin_lock_irq(q->queue_lock); - finish_wait(&rl->wait[is_sync], &wait); - - goto retry; -} - -/* flags: BLK_MQ_REQ_PREEMPT and/or BLK_MQ_REQ_NOWAIT. */ -static struct request *blk_old_get_request(struct request_queue *q, - unsigned int op, blk_mq_req_flags_t flags) -{ - struct request *rq; - gfp_t gfp_mask = flags & BLK_MQ_REQ_NOWAIT ? GFP_ATOMIC : GFP_NOIO; - int ret = 0; - - WARN_ON_ONCE(q->mq_ops); - - /* create ioc upfront */ - create_io_context(gfp_mask, q->node); - - ret = blk_queue_enter(q, flags); - if (ret) - return ERR_PTR(ret); - spin_lock_irq(q->queue_lock); - rq = get_request(q, op, NULL, flags, gfp_mask); - if (IS_ERR(rq)) { - spin_unlock_irq(q->queue_lock); - blk_queue_exit(q); - return rq; - } - - /* q->queue_lock is unlocked at this point */ - rq->__data_len = 0; - rq->__sector = (sector_t) -1; - rq->bio = rq->biotail = NULL; - return rq; -} - /** * blk_get_request - allocate a request * @q: request queue to allocate a request for @@ -1624,53 +738,14 @@ struct request *blk_get_request(struct request_queue *q, unsigned int op, WARN_ON_ONCE(op & REQ_NOWAIT); WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PREEMPT)); - if (q->mq_ops) { - req = blk_mq_alloc_request(q, op, flags); - if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn) - q->mq_ops->initialize_rq_fn(req); - } else { - req = blk_old_get_request(q, op, flags); - if (!IS_ERR(req) && q->initialize_rq_fn) - q->initialize_rq_fn(req); - } + req = blk_mq_alloc_request(q, op, flags); + if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn) + q->mq_ops->initialize_rq_fn(req); return req; } EXPORT_SYMBOL(blk_get_request); -/** - * blk_requeue_request - put a request back on queue - * @q: request queue where request should be inserted - * @rq: request to be inserted - * - * Description: - * Drivers often keep queueing requests until the hardware cannot accept - * more, when that condition happens we need to put the request back - * on the queue. Must be called with queue lock held. - */ -void blk_requeue_request(struct request_queue *q, struct request *rq) -{ - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - blk_delete_timer(rq); - blk_clear_rq_complete(rq); - trace_block_rq_requeue(q, rq); - rq_qos_requeue(q, rq); - - BUG_ON(blk_queued_rq(rq)); - - elv_requeue_request(q, rq); -} -EXPORT_SYMBOL(blk_requeue_request); - -static void add_acct_request(struct request_queue *q, struct request *rq, - int where) -{ - blk_account_io_start(rq, true); - __elv_add_request(q, rq, where); -} - static void part_round_stats_single(struct request_queue *q, int cpu, struct hd_struct *part, unsigned long now, unsigned int inflight) @@ -1730,61 +805,16 @@ EXPORT_SYMBOL_GPL(part_round_stats); void __blk_put_request(struct request_queue *q, struct request *req) { - req_flags_t rq_flags = req->rq_flags; - if (unlikely(!q)) return; - if (q->mq_ops) { - blk_mq_free_request(req); - return; - } - - lockdep_assert_held(q->queue_lock); - - blk_req_zone_write_unlock(req); - blk_pm_put_request(req); - blk_pm_mark_last_busy(req); - - elv_completed_request(q, req); - - /* this is a bio leak */ - WARN_ON(req->bio != NULL); - - rq_qos_done(q, req); - - /* - * Request may not have originated from ll_rw_blk. if not, - * it didn't come out of our reserved rq pools - */ - if (rq_flags & RQF_ALLOCED) { - struct request_list *rl = blk_rq_rl(req); - bool sync = op_is_sync(req->cmd_flags); - - BUG_ON(!list_empty(&req->queuelist)); - BUG_ON(ELV_ON_HASH(req)); - - blk_free_request(rl, req); - freed_request(rl, sync, rq_flags); - blk_put_rl(rl); - blk_queue_exit(q); - } + blk_mq_free_request(req); } EXPORT_SYMBOL_GPL(__blk_put_request); void blk_put_request(struct request *req) { - struct request_queue *q = req->q; - - if (q->mq_ops) - blk_mq_free_request(req); - else { - unsigned long flags; - - spin_lock_irqsave(q->queue_lock, flags); - __blk_put_request(q, req); - spin_unlock_irqrestore(q->queue_lock, flags); - } + blk_mq_free_request(req); } EXPORT_SYMBOL(blk_put_request); @@ -1893,10 +923,7 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, return false; *request_count = 0; - if (q->mq_ops) - plug_list = &plug->mq_list; - else - plug_list = &plug->list; + plug_list = &plug->mq_list; list_for_each_entry_reverse(rq, plug_list, queuelist) { bool merged = false; @@ -1947,11 +974,7 @@ unsigned int blk_plug_queued_count(struct request_queue *q) if (!plug) goto out; - if (q->mq_ops) - plug_list = &plug->mq_list; - else - plug_list = &plug->list; - + plug_list = &plug->mq_list; list_for_each_entry(rq, plug_list, queuelist) { if (rq->q == q) ret++; @@ -1979,133 +1002,6 @@ void blk_init_request_from_bio(struct request *req, struct bio *bio) } EXPORT_SYMBOL_GPL(blk_init_request_from_bio); -static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) -{ - struct blk_plug *plug; - int where = ELEVATOR_INSERT_SORT; - struct request *req, *free; - unsigned int request_count = 0; - - /* - * low level driver can indicate that it wants pages above a - * certain limit bounced to low memory (ie for highmem, or even - * ISA dma in theory) - */ - blk_queue_bounce(q, &bio); - - blk_queue_split(q, &bio); - - if (!bio_integrity_prep(bio)) - return BLK_QC_T_NONE; - - if (op_is_flush(bio->bi_opf)) { - spin_lock_irq(q->queue_lock); - where = ELEVATOR_INSERT_FLUSH; - goto get_rq; - } - - /* - * Check if we can merge with the plugged list before grabbing - * any locks. - */ - if (!blk_queue_nomerges(q)) { - if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) - return BLK_QC_T_NONE; - } else - request_count = blk_plug_queued_count(q); - - spin_lock_irq(q->queue_lock); - - switch (elv_merge(q, &req, bio)) { - case ELEVATOR_BACK_MERGE: - if (!bio_attempt_back_merge(q, req, bio)) - break; - elv_bio_merged(q, req, bio); - free = attempt_back_merge(q, req); - if (free) - __blk_put_request(q, free); - else - elv_merged_request(q, req, ELEVATOR_BACK_MERGE); - goto out_unlock; - case ELEVATOR_FRONT_MERGE: - if (!bio_attempt_front_merge(q, req, bio)) - break; - elv_bio_merged(q, req, bio); - free = attempt_front_merge(q, req); - if (free) - __blk_put_request(q, free); - else - elv_merged_request(q, req, ELEVATOR_FRONT_MERGE); - goto out_unlock; - default: - break; - } - -get_rq: - rq_qos_throttle(q, bio, q->queue_lock); - - /* - * Grab a free request. This is might sleep but can not fail. - * Returns with the queue unlocked. - */ - blk_queue_enter_live(q); - req = get_request(q, bio->bi_opf, bio, 0, GFP_NOIO); - if (IS_ERR(req)) { - blk_queue_exit(q); - rq_qos_cleanup(q, bio); - if (PTR_ERR(req) == -ENOMEM) - bio->bi_status = BLK_STS_RESOURCE; - else - bio->bi_status = BLK_STS_IOERR; - bio_endio(bio); - goto out_unlock; - } - - rq_qos_track(q, req, bio); - - /* - * After dropping the lock and possibly sleeping here, our request - * may now be mergeable after it had proven unmergeable (above). - * We don't worry about that case for efficiency. It won't happen - * often, and the elevators are able to handle it. - */ - blk_init_request_from_bio(req, bio); - - if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) - req->cpu = raw_smp_processor_id(); - - plug = current->plug; - if (plug) { - /* - * If this is the first request added after a plug, fire - * of a plug trace. - * - * @request_count may become stale because of schedule - * out, so check plug list again. - */ - if (!request_count || list_empty(&plug->list)) - trace_block_plug(q); - else { - struct request *last = list_entry_rq(plug->list.prev); - if (request_count >= BLK_MAX_REQUEST_COUNT || - blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE) { - blk_flush_plug_list(plug, false); - trace_block_plug(q); - } - } - list_add_tail(&req->queuelist, &plug->list); - blk_account_io_start(req, true); - } else { - spin_lock_irq(q->queue_lock); - add_acct_request(q, req, where); - __blk_run_queue(q); -out_unlock: - spin_unlock_irq(q->queue_lock); - } - - return BLK_QC_T_NONE; -} - static void handle_bad_sector(struct bio *bio, sector_t maxsector) { char b[BDEVNAME_SIZE]; @@ -2617,9 +1513,6 @@ static int blk_cloned_rq_check_limits(struct request_queue *q, */ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *rq) { - unsigned long flags; - int where = ELEVATOR_INSERT_BACK; - if (blk_cloned_rq_check_limits(q, rq)) return BLK_STS_IOERR; @@ -2627,38 +1520,15 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request * should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) return BLK_STS_IOERR; - if (q->mq_ops) { - if (blk_queue_io_stat(q)) - blk_account_io_start(rq, true); - /* - * Since we have a scheduler attached on the top device, - * bypass a potential scheduler on the bottom device for - * insert. - */ - return blk_mq_request_issue_directly(rq); - } - - spin_lock_irqsave(q->queue_lock, flags); - if (unlikely(blk_queue_dying(q))) { - spin_unlock_irqrestore(q->queue_lock, flags); - return BLK_STS_IOERR; - } + if (blk_queue_io_stat(q)) + blk_account_io_start(rq, true); /* - * Submitting request must be dequeued before calling this function - * because it will be linked to another request_queue + * Since we have a scheduler attached on the top device, + * bypass a potential scheduler on the bottom device for + * insert. */ - BUG_ON(blk_queued_rq(rq)); - - if (op_is_flush(rq->cmd_flags)) - where = ELEVATOR_INSERT_FLUSH; - - add_acct_request(q, rq, where); - if (where == ELEVATOR_INSERT_FLUSH) - __blk_run_queue(q); - spin_unlock_irqrestore(q->queue_lock, flags); - - return BLK_STS_OK; + return blk_mq_request_issue_directly(rq); } EXPORT_SYMBOL_GPL(blk_insert_cloned_request); @@ -2778,225 +1648,6 @@ void blk_account_io_start(struct request *rq, bool new_io) part_stat_unlock(); } -static struct request *elv_next_request(struct request_queue *q) -{ - struct request *rq; - struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); - - WARN_ON_ONCE(q->mq_ops); - - while (1) { - list_for_each_entry(rq, &q->queue_head, queuelist) { -#ifdef CONFIG_PM - /* - * If a request gets queued in state RPM_SUSPENDED - * then that's a kernel bug. - */ - WARN_ON_ONCE(q->rpm_status == RPM_SUSPENDED); -#endif - return rq; - } - - /* - * Flush request is running and flush request isn't queueable - * in the drive, we can hold the queue till flush request is - * finished. Even we don't do this, driver can't dispatch next - * requests and will requeue them. And this can improve - * throughput too. For example, we have request flush1, write1, - * flush 2. flush1 is dispatched, then queue is hold, write1 - * isn't inserted to queue. After flush1 is finished, flush2 - * will be dispatched. Since disk cache is already clean, - * flush2 will be finished very soon, so looks like flush2 is - * folded to flush1. - * Since the queue is hold, a flag is set to indicate the queue - * should be restarted later. Please see flush_end_io() for - * details. - */ - if (fq->flush_pending_idx != fq->flush_running_idx && - !queue_flush_queueable(q)) { - fq->flush_queue_delayed = 1; - return NULL; - } - if (unlikely(blk_queue_bypass(q)) || - !q->elevator->type->ops.sq.elevator_dispatch_fn(q, 0)) - return NULL; - } -} - -/** - * blk_peek_request - peek at the top of a request queue - * @q: request queue to peek at - * - * Description: - * Return the request at the top of @q. The returned request - * should be started using blk_start_request() before LLD starts - * processing it. - * - * Return: - * Pointer to the request at the top of @q if available. Null - * otherwise. - */ -struct request *blk_peek_request(struct request_queue *q) -{ - struct request *rq; - int ret; - - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - while ((rq = elv_next_request(q)) != NULL) { - if (!(rq->rq_flags & RQF_STARTED)) { - /* - * This is the first time the device driver - * sees this request (possibly after - * requeueing). Notify IO scheduler. - */ - if (rq->rq_flags & RQF_SORTED) - elv_activate_rq(q, rq); - - /* - * just mark as started even if we don't start - * it, a request that has been delayed should - * not be passed by new incoming requests - */ - rq->rq_flags |= RQF_STARTED; - trace_block_rq_issue(q, rq); - } - - if (!q->boundary_rq || q->boundary_rq == rq) { - q->end_sector = rq_end_sector(rq); - q->boundary_rq = NULL; - } - - if (rq->rq_flags & RQF_DONTPREP) - break; - - if (q->dma_drain_size && blk_rq_bytes(rq)) { - /* - * make sure space for the drain appears we - * know we can do this because max_hw_segments - * has been adjusted to be one fewer than the - * device can handle - */ - rq->nr_phys_segments++; - } - - if (!q->prep_rq_fn) - break; - - ret = q->prep_rq_fn(q, rq); - if (ret == BLKPREP_OK) { - break; - } else if (ret == BLKPREP_DEFER) { - /* - * the request may have been (partially) prepped. - * we need to keep this request in the front to - * avoid resource deadlock. RQF_STARTED will - * prevent other fs requests from passing this one. - */ - if (q->dma_drain_size && blk_rq_bytes(rq) && - !(rq->rq_flags & RQF_DONTPREP)) { - /* - * remove the space for the drain we added - * so that we don't add it again - */ - --rq->nr_phys_segments; - } - - rq = NULL; - break; - } else if (ret == BLKPREP_KILL || ret == BLKPREP_INVALID) { - rq->rq_flags |= RQF_QUIET; - /* - * Mark this request as started so we don't trigger - * any debug logic in the end I/O path. - */ - blk_start_request(rq); - __blk_end_request_all(rq, ret == BLKPREP_INVALID ? - BLK_STS_TARGET : BLK_STS_IOERR); - } else { - printk(KERN_ERR "%s: bad return=%d\n", __func__, ret); - break; - } - } - - return rq; -} -EXPORT_SYMBOL(blk_peek_request); - -static void blk_dequeue_request(struct request *rq) -{ - struct request_queue *q = rq->q; - - BUG_ON(list_empty(&rq->queuelist)); - BUG_ON(ELV_ON_HASH(rq)); - - list_del_init(&rq->queuelist); - - /* - * the time frame between a request being removed from the lists - * and to it is freed is accounted as io that is in progress at - * the driver side. - */ - if (blk_account_rq(rq)) - q->in_flight[rq_is_sync(rq)]++; -} - -/** - * blk_start_request - start request processing on the driver - * @req: request to dequeue - * - * Description: - * Dequeue @req and start timeout timer on it. This hands off the - * request to the driver. - */ -void blk_start_request(struct request *req) -{ - lockdep_assert_held(req->q->queue_lock); - WARN_ON_ONCE(req->q->mq_ops); - - blk_dequeue_request(req); - - if (test_bit(QUEUE_FLAG_STATS, &req->q->queue_flags)) { - req->io_start_time_ns = ktime_get_ns(); -#ifdef CONFIG_BLK_DEV_THROTTLING_LOW - req->throtl_size = blk_rq_sectors(req); -#endif - req->rq_flags |= RQF_STATS; - rq_qos_issue(req->q, req); - } - - BUG_ON(blk_rq_is_complete(req)); - blk_add_timer(req); -} -EXPORT_SYMBOL(blk_start_request); - -/** - * blk_fetch_request - fetch a request from a request queue - * @q: request queue to fetch a request from - * - * Description: - * Return the request at the top of @q. The request is started on - * return and LLD can start processing it immediately. - * - * Return: - * Pointer to the request at the top of @q if available. Null - * otherwise. - */ -struct request *blk_fetch_request(struct request_queue *q) -{ - struct request *rq; - - lockdep_assert_held(q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - rq = blk_peek_request(q); - if (rq) - blk_start_request(rq); - return rq; -} -EXPORT_SYMBOL(blk_fetch_request); - /* * Steal bios from a request and add them to a bio list. * The request must not have been partially completed before. @@ -3122,252 +1773,6 @@ bool blk_update_request(struct request *req, blk_status_t error, } EXPORT_SYMBOL_GPL(blk_update_request); -static bool blk_update_bidi_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes, - unsigned int bidi_bytes) -{ - if (blk_update_request(rq, error, nr_bytes)) - return true; - - /* Bidi request must be completed as a whole */ - if (unlikely(blk_bidi_rq(rq)) && - blk_update_request(rq->next_rq, error, bidi_bytes)) - return true; - - if (blk_queue_add_random(rq->q)) - add_disk_randomness(rq->rq_disk); - - return false; -} - -/** - * blk_unprep_request - unprepare a request - * @req: the request - * - * This function makes a request ready for complete resubmission (or - * completion). It happens only after all error handling is complete, - * so represents the appropriate moment to deallocate any resources - * that were allocated to the request in the prep_rq_fn. The queue - * lock is held when calling this. - */ -void blk_unprep_request(struct request *req) -{ - struct request_queue *q = req->q; - - req->rq_flags &= ~RQF_DONTPREP; - if (q->unprep_rq_fn) - q->unprep_rq_fn(q, req); -} -EXPORT_SYMBOL_GPL(blk_unprep_request); - -void blk_finish_request(struct request *req, blk_status_t error) -{ - struct request_queue *q = req->q; - u64 now = ktime_get_ns(); - - lockdep_assert_held(req->q->queue_lock); - WARN_ON_ONCE(q->mq_ops); - - if (req->rq_flags & RQF_STATS) - blk_stat_add(req, now); - - BUG_ON(blk_queued_rq(req)); - - if (unlikely(laptop_mode) && !blk_rq_is_passthrough(req)) - laptop_io_completion(req->q->backing_dev_info); - - blk_delete_timer(req); - - if (req->rq_flags & RQF_DONTPREP) - blk_unprep_request(req); - - blk_account_io_done(req, now); - - if (req->end_io) { - rq_qos_done(q, req); - req->end_io(req, error); - } else { - if (blk_bidi_rq(req)) - __blk_put_request(req->next_rq->q, req->next_rq); - - __blk_put_request(q, req); - } -} -EXPORT_SYMBOL(blk_finish_request); - -/** - * blk_end_bidi_request - Complete a bidi request - * @rq: the request to complete - * @error: block status code - * @nr_bytes: number of bytes to complete @rq - * @bidi_bytes: number of bytes to complete @rq->next_rq - * - * Description: - * Ends I/O on a number of bytes attached to @rq and @rq->next_rq. - * Drivers that supports bidi can safely call this member for any - * type of request, bidi or uni. In the later case @bidi_bytes is - * just ignored. - * - * Return: - * %false - we are done with this request - * %true - still buffers pending for this request - **/ -static bool blk_end_bidi_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes, unsigned int bidi_bytes) -{ - struct request_queue *q = rq->q; - unsigned long flags; - - WARN_ON_ONCE(q->mq_ops); - - if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) - return true; - - spin_lock_irqsave(q->queue_lock, flags); - blk_finish_request(rq, error); - spin_unlock_irqrestore(q->queue_lock, flags); - - return false; -} - -/** - * __blk_end_bidi_request - Complete a bidi request with queue lock held - * @rq: the request to complete - * @error: block status code - * @nr_bytes: number of bytes to complete @rq - * @bidi_bytes: number of bytes to complete @rq->next_rq - * - * Description: - * Identical to blk_end_bidi_request() except that queue lock is - * assumed to be locked on entry and remains so on return. - * - * Return: - * %false - we are done with this request - * %true - still buffers pending for this request - **/ -static bool __blk_end_bidi_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes, unsigned int bidi_bytes) -{ - lockdep_assert_held(rq->q->queue_lock); - WARN_ON_ONCE(rq->q->mq_ops); - - if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) - return true; - - blk_finish_request(rq, error); - - return false; -} - -/** - * blk_end_request - Helper function for drivers to complete the request. - * @rq: the request being processed - * @error: block status code - * @nr_bytes: number of bytes to complete - * - * Description: - * Ends I/O on a number of bytes attached to @rq. - * If @rq has leftover, sets it up for the next range of segments. - * - * Return: - * %false - we are done with this request - * %true - still buffers pending for this request - **/ -bool blk_end_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes) -{ - WARN_ON_ONCE(rq->q->mq_ops); - return blk_end_bidi_request(rq, error, nr_bytes, 0); -} -EXPORT_SYMBOL(blk_end_request); - -/** - * blk_end_request_all - Helper function for drives to finish the request. - * @rq: the request to finish - * @error: block status code - * - * Description: - * Completely finish @rq. - */ -void blk_end_request_all(struct request *rq, blk_status_t error) -{ - bool pending; - unsigned int bidi_bytes = 0; - - if (unlikely(blk_bidi_rq(rq))) - bidi_bytes = blk_rq_bytes(rq->next_rq); - - pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); - BUG_ON(pending); -} -EXPORT_SYMBOL(blk_end_request_all); - -/** - * __blk_end_request - Helper function for drivers to complete the request. - * @rq: the request being processed - * @error: block status code - * @nr_bytes: number of bytes to complete - * - * Description: - * Must be called with queue lock held unlike blk_end_request(). - * - * Return: - * %false - we are done with this request - * %true - still buffers pending for this request - **/ -bool __blk_end_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes) -{ - lockdep_assert_held(rq->q->queue_lock); - WARN_ON_ONCE(rq->q->mq_ops); - - return __blk_end_bidi_request(rq, error, nr_bytes, 0); -} -EXPORT_SYMBOL(__blk_end_request); - -/** - * __blk_end_request_all - Helper function for drives to finish the request. - * @rq: the request to finish - * @error: block status code - * - * Description: - * Completely finish @rq. Must be called with queue lock held. - */ -void __blk_end_request_all(struct request *rq, blk_status_t error) -{ - bool pending; - unsigned int bidi_bytes = 0; - - lockdep_assert_held(rq->q->queue_lock); - WARN_ON_ONCE(rq->q->mq_ops); - - if (unlikely(blk_bidi_rq(rq))) - bidi_bytes = blk_rq_bytes(rq->next_rq); - - pending = __blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); - BUG_ON(pending); -} -EXPORT_SYMBOL(__blk_end_request_all); - -/** - * __blk_end_request_cur - Helper function to finish the current request chunk. - * @rq: the request to finish the current chunk for - * @error: block status code - * - * Description: - * Complete the current consecutively mapped chunk from @rq. Must - * be called with queue lock held. - * - * Return: - * %false - we are done with this request - * %true - still buffers pending for this request - */ -bool __blk_end_request_cur(struct request *rq, blk_status_t error) -{ - return __blk_end_request(rq, error, blk_rq_cur_bytes(rq)); -} -EXPORT_SYMBOL(__blk_end_request_cur); - void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) { @@ -3567,7 +1972,6 @@ void blk_start_plug(struct blk_plug *plug) if (tsk->plug) return; - INIT_LIST_HEAD(&plug->list); INIT_LIST_HEAD(&plug->mq_list); INIT_LIST_HEAD(&plug->cb_list); /* @@ -3578,36 +1982,6 @@ void blk_start_plug(struct blk_plug *plug) } EXPORT_SYMBOL(blk_start_plug); -static int plug_rq_cmp(void *priv, struct list_head *a, struct list_head *b) -{ - struct request *rqa = container_of(a, struct request, queuelist); - struct request *rqb = container_of(b, struct request, queuelist); - - return !(rqa->q < rqb->q || - (rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb))); -} - -/* - * If 'from_schedule' is true, then postpone the dispatch of requests - * until a safe kblockd context. We due this to avoid accidental big - * additional stack usage in driver dispatch, in places where the originally - * plugger did not intend it. - */ -static void queue_unplugged(struct request_queue *q, unsigned int depth, - bool from_schedule) - __releases(q->queue_lock) -{ - lockdep_assert_held(q->queue_lock); - - trace_block_unplug(q, depth, !from_schedule); - - if (from_schedule) - blk_run_queue_async(q); - else - __blk_run_queue(q); - spin_unlock_irq(q->queue_lock); -} - static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) { LIST_HEAD(callbacks); @@ -3652,65 +2026,10 @@ EXPORT_SYMBOL(blk_check_plugged); void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) { - struct request_queue *q; - struct request *rq; - LIST_HEAD(list); - unsigned int depth; - flush_plug_callbacks(plug, from_schedule); if (!list_empty(&plug->mq_list)) blk_mq_flush_plug_list(plug, from_schedule); - - if (list_empty(&plug->list)) - return; - - list_splice_init(&plug->list, &list); - - list_sort(NULL, &list, plug_rq_cmp); - - q = NULL; - depth = 0; - - while (!list_empty(&list)) { - rq = list_entry_rq(list.next); - list_del_init(&rq->queuelist); - BUG_ON(!rq->q); - if (rq->q != q) { - /* - * This drops the queue lock - */ - if (q) - queue_unplugged(q, depth, from_schedule); - q = rq->q; - depth = 0; - spin_lock_irq(q->queue_lock); - } - - /* - * Short-circuit if @q is dead - */ - if (unlikely(blk_queue_dying(q))) { - __blk_end_request_all(rq, BLK_STS_IOERR); - continue; - } - - /* - * rq is already accounted, so use raw insert - */ - if (op_is_flush(rq->cmd_flags)) - __elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH); - else - __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE); - - depth++; - } - - /* - * This drops the queue lock - */ - if (q) - queue_unplugged(q, depth, from_schedule); } void blk_finish_plug(struct blk_plug *plug) diff --git a/block/blk-exec.c b/block/blk-exec.c index f7b292f12449..a34b7d918742 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -48,8 +48,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head, rq_end_io_fn *done) { - int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; - WARN_ON(irqs_disabled()); WARN_ON(!blk_rq_is_passthrough(rq)); @@ -60,23 +58,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, * don't check dying flag for MQ because the request won't * be reused after dying flag is set */ - if (q->mq_ops) { - blk_mq_sched_insert_request(rq, at_head, true, false); - return; - } - - spin_lock_irq(q->queue_lock); - - if (unlikely(blk_queue_dying(q))) { - rq->rq_flags |= RQF_QUIET; - __blk_end_request_all(rq, BLK_STS_IOERR); - spin_unlock_irq(q->queue_lock); - return; - } - - __elv_add_request(q, rq, where); - __blk_run_queue(q); - spin_unlock_irq(q->queue_lock); + blk_mq_sched_insert_request(rq, at_head, true, false); } EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); diff --git a/block/blk-ioc.c b/block/blk-ioc.c index 01580f88fcb3..391128456aec 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -48,10 +48,8 @@ static void ioc_exit_icq(struct io_cq *icq) if (icq->flags & ICQ_EXITED) return; - if (et->uses_mq && et->ops.mq.exit_icq) + if (et->ops.mq.exit_icq) et->ops.mq.exit_icq(icq); - else if (!et->uses_mq && et->ops.sq.elevator_exit_icq_fn) - et->ops.sq.elevator_exit_icq_fn(icq); icq->flags |= ICQ_EXITED; } @@ -187,25 +185,13 @@ void put_io_context_active(struct io_context *ioc) * reverse double locking. Read comment in ioc_release_fn() for * explanation on the nested locking annotation. */ -retry: spin_lock_irqsave_nested(&ioc->lock, flags, 1); hlist_for_each_entry(icq, &ioc->icq_list, ioc_node) { if (icq->flags & ICQ_EXITED) continue; et = icq->q->elevator->type; - if (et->uses_mq) { - ioc_exit_icq(icq); - } else { - if (spin_trylock(icq->q->queue_lock)) { - ioc_exit_icq(icq); - spin_unlock(icq->q->queue_lock); - } else { - spin_unlock_irqrestore(&ioc->lock, flags); - cpu_relax(); - goto retry; - } - } + ioc_exit_icq(icq); } spin_unlock_irqrestore(&ioc->lock, flags); @@ -232,7 +218,7 @@ static void __ioc_clear_queue(struct list_head *icq_list) while (!list_empty(icq_list)) { struct io_cq *icq = list_entry(icq_list->next, - struct io_cq, q_node); + struct io_cq, q_node); struct io_context *ioc = icq->ioc; spin_lock_irqsave(&ioc->lock, flags); @@ -253,14 +239,9 @@ void ioc_clear_queue(struct request_queue *q) spin_lock_irq(q->queue_lock); list_splice_init(&q->icq_list, &icq_list); + spin_unlock_irq(q->queue_lock); - if (q->mq_ops) { - spin_unlock_irq(q->queue_lock); - __ioc_clear_queue(&icq_list); - } else { - __ioc_clear_queue(&icq_list); - spin_unlock_irq(q->queue_lock); - } + __ioc_clear_queue(&icq_list); } int create_task_io_context(struct task_struct *task, gfp_t gfp_flags, int node) @@ -415,10 +396,8 @@ struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, if (likely(!radix_tree_insert(&ioc->icq_tree, q->id, icq))) { hlist_add_head(&icq->ioc_node, &ioc->icq_list); list_add(&icq->q_node, &q->icq_list); - if (et->uses_mq && et->ops.mq.init_icq) + if (et->ops.mq.init_icq) et->ops.mq.init_icq(icq); - else if (!et->uses_mq && et->ops.sq.elevator_init_icq_fn) - et->ops.sq.elevator_init_icq_fn(icq); } else { kmem_cache_free(et->icq_cache, icq); icq = ioc_lookup_icq(ioc, q); diff --git a/block/blk-merge.c b/block/blk-merge.c index 6b5ad275ed56..c068c30b0c35 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -862,13 +862,8 @@ struct request *attempt_front_merge(struct request_queue *q, struct request *rq) int blk_attempt_req_merge(struct request_queue *q, struct request *rq, struct request *next) { - struct elevator_queue *e = q->elevator; struct request *free; - if (!e->uses_mq && e->type->ops.sq.elevator_allow_rq_merge_fn) - if (!e->type->ops.sq.elevator_allow_rq_merge_fn(q, rq, next)) - return 0; - free = attempt_merge(q, rq, next); if (free) { __blk_put_request(q, free); diff --git a/block/blk-settings.c b/block/blk-settings.c index ac8b8ba4b126..39c3c301a687 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -20,40 +20,6 @@ EXPORT_SYMBOL(blk_max_low_pfn); unsigned long blk_max_pfn; -/** - * blk_queue_prep_rq - set a prepare_request function for queue - * @q: queue - * @pfn: prepare_request function - * - * It's possible for a queue to register a prepare_request callback which - * is invoked before the request is handed to the request_fn. The goal of - * the function is to prepare a request for I/O, it can be used to build a - * cdb from the request data for instance. - * - */ -void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn) -{ - q->prep_rq_fn = pfn; -} -EXPORT_SYMBOL(blk_queue_prep_rq); - -/** - * blk_queue_unprep_rq - set an unprepare_request function for queue - * @q: queue - * @ufn: unprepare_request function - * - * It's possible for a queue to register an unprepare_request callback - * which is invoked before the request is finally completed. The goal - * of the function is to deallocate any data that was allocated in the - * prepare_request callback. - * - */ -void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn) -{ - q->unprep_rq_fn = ufn; -} -EXPORT_SYMBOL(blk_queue_unprep_rq); - void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn) { q->softirq_done_fn = fn; @@ -163,8 +129,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) q->make_request_fn = mfn; blk_queue_dma_alignment(q, 511); - blk_queue_congestion_threshold(q); - q->nr_batching = BLK_BATCH_REQ; blk_set_default_limits(&q->limits); } diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 1b82ccfde3fe..d4b1b84ba8ca 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -68,7 +68,7 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count) unsigned long nr; int ret, err; - if (!q->request_fn && !q->mq_ops) + if (!q->mq_ops) return -EINVAL; ret = queue_var_store(&nr, page, count); @@ -78,11 +78,7 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count) if (nr < BLKDEV_MIN_RQ) nr = BLKDEV_MIN_RQ; - if (q->request_fn) - err = blk_update_nr_requests(q, nr); - else - err = blk_mq_update_nr_requests(q, nr); - + err = blk_mq_update_nr_requests(q, nr); if (err) return err; @@ -463,20 +459,14 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, * ends up either enabling or disabling wbt completely. We can't * have IO inflight if that happens. */ - if (q->mq_ops) { - blk_mq_freeze_queue(q); - blk_mq_quiesce_queue(q); - } else - blk_queue_bypass_start(q); + blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); wbt_set_min_lat(q, val); wbt_update_limits(q); - if (q->mq_ops) { - blk_mq_unquiesce_queue(q); - blk_mq_unfreeze_queue(q); - } else - blk_queue_bypass_end(q); + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q); return count; } @@ -847,17 +837,10 @@ static void __blk_release_queue(struct work_struct *work) blk_free_queue_stats(q->stats); - blk_exit_rl(q, &q->root_rl); - blk_queue_free_zone_bitmaps(q); - if (!q->mq_ops) { - if (q->exit_rq_fn) - q->exit_rq_fn(q, q->fq->flush_rq); - blk_free_flush_queue(q->fq); - } else { + if (q->mq_ops) blk_mq_release(q); - } blk_trace_shutdown(q); @@ -920,7 +903,6 @@ int blk_register_queue(struct gendisk *disk) if (!blk_queue_init_done(q)) { queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); percpu_ref_switch_to_percpu(&q->q_usage_counter); - blk_queue_bypass_end(q); } ret = blk_trace_init_sysfs(dev); @@ -947,7 +929,7 @@ int blk_register_queue(struct gendisk *disk) blk_throtl_register_queue(q); - if (q->request_fn || (q->mq_ops && q->elevator)) { + if ((q->mq_ops && q->elevator)) { ret = elv_register_queue(q); if (ret) { mutex_unlock(&q->sysfs_lock); @@ -1005,7 +987,7 @@ void blk_unregister_queue(struct gendisk *disk) blk_trace_remove_sysfs(disk_to_dev(disk)); mutex_lock(&q->sysfs_lock); - if (q->request_fn || (q->mq_ops && q->elevator)) + if (q->mq_ops && q->elevator) elv_unregister_queue(q); mutex_unlock(&q->sysfs_lock); diff --git a/block/blk.h b/block/blk.h index 57a302bf5a70..e2604ae7ddfa 100644 --- a/block/blk.h +++ b/block/blk.h @@ -7,12 +7,6 @@ #include <xen/xen.h> #include "blk-mq.h" -/* Amount of time in which a process may batch requests */ -#define BLK_BATCH_TIME (HZ/50UL) - -/* Number of requests a "batching" process may submit */ -#define BLK_BATCH_REQ 32 - /* Max future timer expiry for timeouts */ #define BLK_MAX_TIMEOUT (5 * HZ) @@ -132,9 +126,6 @@ void blk_exit_rl(struct request_queue *q, struct request_list *rl); void blk_exit_queue(struct request_queue *q); void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio); -void blk_queue_bypass_start(struct request_queue *q); -void blk_queue_bypass_end(struct request_queue *q); -void __blk_queue_free_tags(struct request_queue *q); void blk_freeze_queue(struct request_queue *q); static inline void blk_queue_enter_live(struct request_queue *q) @@ -281,23 +272,6 @@ static inline bool blk_rq_is_complete(struct request *rq) void blk_insert_flush(struct request *rq); -static inline void elv_activate_rq(struct request_queue *q, struct request *rq) -{ - struct elevator_queue *e = q->elevator; - - if (e->type->ops.sq.elevator_activate_req_fn) - e->type->ops.sq.elevator_activate_req_fn(q, rq); -} - -static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq) -{ - struct elevator_queue *e = q->elevator; - - if (e->type->ops.sq.elevator_deactivate_req_fn) - e->type->ops.sq.elevator_deactivate_req_fn(q, rq); -} - -int elevator_init(struct request_queue *); int elevator_init_mq(struct request_queue *q); int elevator_switch_mq(struct request_queue *q, struct elevator_type *new_e); @@ -332,31 +306,8 @@ void blk_rq_set_mixed_merge(struct request *rq); bool blk_rq_merge_ok(struct request *rq, struct bio *bio); enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); -void blk_queue_congestion_threshold(struct request_queue *q); - int blk_dev_init(void); - -/* - * Return the threshold (number of used requests) at which the queue is - * considered to be congested. It include a little hysteresis to keep the - * context switch rate down. - */ -static inline int queue_congestion_on_threshold(struct request_queue *q) -{ - return q->nr_congestion_on; -} - -/* - * The threshold at which a queue is considered to be uncongested - */ -static inline int queue_congestion_off_threshold(struct request_queue *q) -{ - return q->nr_congestion_off; -} - -extern int blk_update_nr_requests(struct request_queue *, unsigned int); - /* * Contribute to IO statistics IFF: * @@ -478,8 +429,6 @@ static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) } #endif /* CONFIG_BOUNCE */ -extern void blk_drain_queue(struct request_queue *q); - #ifdef CONFIG_BLK_CGROUP_IOLATENCY extern int blk_iolatency_init(struct request_queue *q); #else diff --git a/block/elevator.c b/block/elevator.c index 54e1adac26c5..334097c54b08 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -61,10 +61,8 @@ static int elv_iosched_allow_bio_merge(struct request *rq, struct bio *bio) struct request_queue *q = rq->q; struct elevator_queue *e = q->elevator; - if (e->uses_mq && e->type->ops.mq.allow_merge) + if (e->type->ops.mq.allow_merge) return e->type->ops.mq.allow_merge(q, rq, bio); - else if (!e->uses_mq && e->type->ops.sq.elevator_allow_bio_merge_fn) - return e->type->ops.sq.elevator_allow_bio_merge_fn(q, rq, bio); return 1; } @@ -95,14 +93,14 @@ static bool elevator_match(const struct elevator_type *e, const char *name) } /* - * Return scheduler with name 'name' and with matching 'mq capability + * Return scheduler with name 'name' */ -static struct elevator_type *elevator_find(const char *name, bool mq) +static struct elevator_type *elevator_find(const char *name) { struct elevator_type *e; list_for_each_entry(e, &elv_list, list) { - if (elevator_match(e, name) && (mq == e->uses_mq)) + if (elevator_match(e, name)) return e; } @@ -121,12 +119,12 @@ static struct elevator_type *elevator_get(struct request_queue *q, spin_lock(&elv_list_lock); - e = elevator_find(name, q->mq_ops != NULL); + e = elevator_find(name); if (!e && try_loading) { spin_unlock(&elv_list_lock); request_module("%s-iosched", name); spin_lock(&elv_list_lock); - e = elevator_find(name, q->mq_ops != NULL); + e = elevator_find(name); } if (e && !try_module_get(e->elevator_owner)) @@ -150,26 +148,6 @@ static int __init elevator_setup(char *str) __setup("elevator=", elevator_setup); -/* called during boot to load the elevator chosen by the elevator param */ -void __init load_default_elevator_module(void) -{ - struct elevator_type *e; - - if (!chosen_elevator[0]) - return; - - /* - * Boot parameter is deprecated, we haven't supported that for MQ. - * Only look for non-mq schedulers from here. - */ - spin_lock(&elv_list_lock); - e = elevator_find(chosen_elevator, false); - spin_unlock(&elv_list_lock); - - if (!e) - request_module("%s-iosched", chosen_elevator); -} - static struct kobj_type elv_ktype; struct elevator_queue *elevator_alloc(struct request_queue *q, @@ -185,7 +163,6 @@ struct elevator_queue *elevator_alloc(struct request_queue *q, kobject_init(&eq->kobj, &elv_ktype); mutex_init(&eq->sysfs_lock); hash_init(eq->hash); - eq->uses_mq = e->uses_mq; return eq; } @@ -200,52 +177,11 @@ static void elevator_release(struct kobject *kobj) kfree(e); } -/* - * Use the default elevator specified by config boot param for non-mq devices, - * or by config option. Don't try to load modules as we could be running off - * async and request_module() isn't allowed from async. - */ -int elevator_init(struct request_queue *q) -{ - struct elevator_type *e = NULL; - int err = 0; - - /* - * q->sysfs_lock must be held to provide mutual exclusion between - * elevator_switch() and here. - */ - mutex_lock(&q->sysfs_lock); - if (unlikely(q->elevator)) - goto out_unlock; - - if (*chosen_elevator) { - e = elevator_get(q, chosen_elevator, false); - if (!e) - printk(KERN_ERR "I/O scheduler %s not found\n", - chosen_elevator); - } - - if (!e) { - printk(KERN_ERR - "Default I/O scheduler not found. Using noop.\n"); - e = elevator_get(q, "noop", false); - } - - err = e->ops.sq.elevator_init_fn(q, e); - if (err) - elevator_put(e); -out_unlock: - mutex_unlock(&q->sysfs_lock); - return err; -} - void elevator_exit(struct request_queue *q, struct elevator_queue *e) { mutex_lock(&e->sysfs_lock); - if (e->uses_mq && e->type->ops.mq.exit_sched) + if (e->type->ops.mq.exit_sched) blk_mq_exit_sched(q, e); - else if (!e->uses_mq && e->type->ops.sq.elevator_exit_fn) - e->type->ops.sq.elevator_exit_fn(e); mutex_unlock(&e->sysfs_lock); kobject_put(&e->kobj); @@ -393,10 +329,8 @@ enum elv_merge elv_merge(struct request_queue *q, struct request **req, return ELEVATOR_BACK_MERGE; } - if (e->uses_mq && e->type->ops.mq.request_merge) + if (e->type->ops.mq.request_merge) return e->type->ops.mq.request_merge(q, req, bio); - else if (!e->uses_mq && e->type->ops.sq.elevator_merge_fn) - return e->type->ops.sq.elevator_merge_fn(q, req, bio); return ELEVATOR_NO_MERGE; } @@ -447,10 +381,8 @@ void elv_merged_request(struct request_queue *q, struct request *rq, { struct elevator_queue *e = q->elevator; - if (e->uses_mq && e->type->ops.mq.request_merged) + if (e->type->ops.mq.request_merged) e->type->ops.mq.request_merged(q, rq, type); - else if (!e->uses_mq && e->type->ops.sq.elevator_merged_fn) - e->type->ops.sq.elevator_merged_fn(q, rq, type); if (type == ELEVATOR_BACK_MERGE) elv_rqhash_reposition(q, rq); @@ -464,13 +396,8 @@ void elv_merge_requests(struct request_queue *q, struct request *rq, struct elevator_queue *e = q->elevator; bool next_sorted = false; - if (e->uses_mq && e->type->ops.mq.requests_merged) + if (e->type->ops.mq.requests_merged) e->type->ops.mq.requests_merged(q, rq, next); - else if (e->type->ops.sq.elevator_merge_req_fn) { - next_sorted = (__force bool)(next->rq_flags & RQF_SORTED); - if (next_sorted) - e->type->ops.sq.elevator_merge_req_fn(q, rq, next); - } elv_rqhash_reposition(q, rq); @@ -482,156 +409,12 @@ void elv_merge_requests(struct request_queue *q, struct request *rq, q->last_merge = rq; } -void elv_bio_merged(struct request_queue *q, struct request *rq, - struct bio *bio) -{ - struct elevator_queue *e = q->elevator; - - if (WARN_ON_ONCE(e->uses_mq)) - return; - - if (e->type->ops.sq.elevator_bio_merged_fn) - e->type->ops.sq.elevator_bio_merged_fn(q, rq, bio); -} - -void elv_requeue_request(struct request_queue *q, struct request *rq) -{ - /* - * it already went through dequeue, we need to decrement the - * in_flight count again - */ - if (blk_account_rq(rq)) { - q->in_flight[rq_is_sync(rq)]--; - if (rq->rq_flags & RQF_SORTED) - elv_deactivate_rq(q, rq); - } - - rq->rq_flags &= ~RQF_STARTED; - - blk_pm_requeue_request(rq); - - __elv_add_request(q, rq, ELEVATOR_INSERT_REQUEUE); -} - -void elv_drain_elevator(struct request_queue *q) -{ - struct elevator_queue *e = q->elevator; - static int printed; - - if (WARN_ON_ONCE(e->uses_mq)) - return; - - lockdep_assert_held(q->queue_lock); - - while (e->type->ops.sq.elevator_dispatch_fn(q, 1)) - ; - if (q->nr_sorted && !blk_queue_is_zoned(q) && printed++ < 10 ) { - printk(KERN_ERR "%s: forced dispatching is broken " - "(nr_sorted=%u), please report this\n", - q->elevator->type->elevator_name, q->nr_sorted); - } -} - -void __elv_add_request(struct request_queue *q, struct request *rq, int where) -{ - trace_block_rq_insert(q, rq); - - blk_pm_add_request(q, rq); - - rq->q = q; - - if (rq->rq_flags & RQF_SOFTBARRIER) { - /* barriers are scheduling boundary, update end_sector */ - if (!blk_rq_is_passthrough(rq)) { - q->end_sector = rq_end_sector(rq); - q->boundary_rq = rq; - } - } else if (!(rq->rq_flags & RQF_ELVPRIV) && - (where == ELEVATOR_INSERT_SORT || - where == ELEVATOR_INSERT_SORT_MERGE)) - where = ELEVATOR_INSERT_BACK; - - switch (where) { - case ELEVATOR_INSERT_REQUEUE: - case ELEVATOR_INSERT_FRONT: - rq->rq_flags |= RQF_SOFTBARRIER; - list_add(&rq->queuelist, &q->queue_head); - break; - - case ELEVATOR_INSERT_BACK: - rq->rq_flags |= RQF_SOFTBARRIER; - elv_drain_elevator(q); - list_add_tail(&rq->queuelist, &q->queue_head); - /* - * We kick the queue here for the following reasons. - * - The elevator might have returned NULL previously - * to delay requests and returned them now. As the - * queue wasn't empty before this request, ll_rw_blk - * won't run the queue on return, resulting in hang. - * - Usually, back inserted requests won't be merged - * with anything. There's no point in delaying queue - * processing. - */ - __blk_run_queue(q); - break; - - case ELEVATOR_INSERT_SORT_MERGE: - /* - * If we succeed in merging this request with one in the - * queue already, we are done - rq has now been freed, - * so no need to do anything further. - */ - if (elv_attempt_insert_merge(q, rq)) - break; - /* fall through */ - case ELEVATOR_INSERT_SORT: - BUG_ON(blk_rq_is_passthrough(rq)); - rq->rq_flags |= RQF_SORTED; - q->nr_sorted++; - if (rq_mergeable(rq)) { - elv_rqhash_add(q, rq); - if (!q->last_merge) - q->last_merge = rq; - } - - /* - * Some ioscheds (cfq) run q->request_fn directly, so - * rq cannot be accessed after calling - * elevator_add_req_fn. - */ - q->elevator->type->ops.sq.elevator_add_req_fn(q, rq); - break; - - case ELEVATOR_INSERT_FLUSH: - rq->rq_flags |= RQF_SOFTBARRIER; - blk_insert_flush(rq); - break; - default: - printk(KERN_ERR "%s: bad insertion point %d\n", - __func__, where); - BUG(); - } -} -EXPORT_SYMBOL(__elv_add_request); - -void elv_add_request(struct request_queue *q, struct request *rq, int where) -{ - unsigned long flags; - - spin_lock_irqsave(q->queue_lock, flags); - __elv_add_request(q, rq, where); - spin_unlock_irqrestore(q->queue_lock, flags); -} -EXPORT_SYMBOL(elv_add_request); - struct request *elv_latter_request(struct request_queue *q, struct request *rq) { struct elevator_queue *e = q->elevator; - if (e->uses_mq && e->type->ops.mq.next_request) + if (e->type->ops.mq.next_request) return e->type->ops.mq.next_request(q, rq); - else if (!e->uses_mq && e->type->ops.sq.elevator_latter_req_fn) - return e->type->ops.sq.elevator_latter_req_fn(q, rq); return NULL; } @@ -640,66 +423,10 @@ struct request *elv_former_request(struct request_queue *q, struct request *rq) { struct elevator_queue *e = q->elevator; - if (e->uses_mq && e->type->ops.mq.former_request) + if (e->type->ops.mq.former_request) return e->type->ops.mq.former_request(q, rq); - if (!e->uses_mq && e->type->ops.sq.elevator_former_req_fn) - return e->type->ops.sq.elevator_former_req_fn(q, rq); - return NULL; -} - -int elv_set_request(struct request_queue *q, struct request *rq, - struct bio *bio, gfp_t gfp_mask) -{ - struct elevator_queue *e = q->elevator; - - if (WARN_ON_ONCE(e->uses_mq)) - return 0; - if (e->type->ops.sq.elevator_set_req_fn) - return e->type->ops.sq.elevator_set_req_fn(q, rq, bio, gfp_mask); - return 0; -} - -void elv_put_request(struct request_queue *q, struct request *rq) -{ - struct elevator_queue *e = q->elevator; - - if (WARN_ON_ONCE(e->uses_mq)) - return; - - if (e->type->ops.sq.elevator_put_req_fn) - e->type->ops.sq.elevator_put_req_fn(rq); -} - -int elv_may_queue(struct request_queue *q, unsigned int op) -{ - struct elevator_queue *e = q->elevator; - - if (WARN_ON_ONCE(e->uses_mq)) - return 0; - - if (e->type->ops.sq.elevator_may_queue_fn) - return e->type->ops.sq.elevator_may_queue_fn(q, op); - - return ELV_MQUEUE_MAY; -} - -void elv_completed_request(struct request_queue *q, struct request *rq) -{ - struct elevator_queue *e = q->elevator; - - if (WARN_ON_ONCE(e->uses_mq)) - return; - - /* - * request is released from the driver, io must be done - */ - if (blk_account_rq(rq)) { - q->in_flight[rq_is_sync(rq)]--; - if ((rq->rq_flags & RQF_SORTED) && - e->type->ops.sq.elevator_completed_req_fn) - e->type->ops.sq.elevator_completed_req_fn(q, rq); - } + return NULL; } #define to_elv(atr) container_of((atr), struct elv_fs_entry, attr) @@ -768,8 +495,6 @@ int elv_register_queue(struct request_queue *q) } kobject_uevent(&e->kobj, KOBJ_ADD); e->registered = 1; - if (!e->uses_mq && e->type->ops.sq.elevator_registered_fn) - e->type->ops.sq.elevator_registered_fn(q); } return error; } @@ -809,7 +534,7 @@ int elv_register(struct elevator_type *e) /* register, don't allow duplicate names */ spin_lock(&elv_list_lock); - if (elevator_find(e->elevator_name, e->uses_mq)) { + if (elevator_find(e->elevator_name)) { spin_unlock(&elv_list_lock); kmem_cache_destroy(e->icq_cache); return -EBUSY; @@ -919,71 +644,17 @@ out_unlock: */ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e) { - struct elevator_queue *old = q->elevator; - bool old_registered = false; int err; lockdep_assert_held(&q->sysfs_lock); - if (q->mq_ops) { - blk_mq_freeze_queue(q); - blk_mq_quiesce_queue(q); - - err = elevator_switch_mq(q, new_e); - - blk_mq_unquiesce_queue(q); - blk_mq_unfreeze_queue(q); - - return err; - } - - /* - * Turn on BYPASS and drain all requests w/ elevator private data. - * Block layer doesn't call into a quiesced elevator - all requests - * are directly put on the dispatch list without elevator data - * using INSERT_BACK. All requests have SOFTBARRIER set and no - * merge happens either. - */ - if (old) { - old_registered = old->registered; - - blk_queue_bypass_start(q); - - /* unregister and clear all auxiliary data of the old elevator */ - if (old_registered) - elv_unregister_queue(q); - - ioc_clear_queue(q); - } - - /* allocate, init and register new elevator */ - err = new_e->ops.sq.elevator_init_fn(q, new_e); - if (err) - goto fail_init; - - err = elv_register_queue(q); - if (err) - goto fail_register; - - /* done, kill the old one and finish */ - if (old) { - elevator_exit(q, old); - blk_queue_bypass_end(q); - } - - blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name); + blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); - return 0; + err = elevator_switch_mq(q, new_e); -fail_register: - elevator_exit(q, q->elevator); -fail_init: - /* switch failed, restore and re-register old elevator */ - if (old) { - q->elevator = old; - elv_register_queue(q); - blk_queue_bypass_end(q); - } + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q); return err; } @@ -1032,7 +703,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name, { int ret; - if (!(q->mq_ops || q->request_fn) || !elv_support_iosched(q)) + if (!q->mq_ops || !elv_support_iosched(q)) return count; ret = __elevator_change(q, name); @@ -1047,7 +718,6 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) struct elevator_queue *e = q->elevator; struct elevator_type *elv = NULL; struct elevator_type *__e; - bool uses_mq = q->mq_ops != NULL; int len = 0; if (!queue_is_rq_based(q)) @@ -1060,14 +730,11 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) spin_lock(&elv_list_lock); list_for_each_entry(__e, &elv_list, list) { - if (elv && elevator_match(elv, __e->elevator_name) && - (__e->uses_mq == uses_mq)) { + if (elv && elevator_match(elv, __e->elevator_name)) { len += sprintf(name+len, "[%s] ", elv->elevator_name); continue; } - if (__e->uses_mq && q->mq_ops && elv_support_iosched(q)) - len += sprintf(name+len, "%s ", __e->elevator_name); - else if (!__e->uses_mq && !q->mq_ops) + if (elv_support_iosched(q)) len += sprintf(name+len, "%s ", __e->elevator_name); } spin_unlock(&elv_list_lock); diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c index eccac01a10b6..728757a34fa0 100644 --- a/block/kyber-iosched.c +++ b/block/kyber-iosched.c @@ -1032,7 +1032,6 @@ static struct elevator_type kyber_sched = { .dispatch_request = kyber_dispatch_request, .has_work = kyber_has_work, }, - .uses_mq = true, #ifdef CONFIG_BLK_DEBUG_FS .queue_debugfs_attrs = kyber_queue_debugfs_attrs, .hctx_debugfs_attrs = kyber_hctx_debugfs_attrs, diff --git a/block/mq-deadline.c b/block/mq-deadline.c index 099a9e05854c..513edefd10fd 100644 --- a/block/mq-deadline.c +++ b/block/mq-deadline.c @@ -777,7 +777,6 @@ static struct elevator_type mq_deadline = { .exit_sched = dd_exit_queue, }, - .uses_mq = true, #ifdef CONFIG_BLK_DEBUG_FS .queue_debugfs_attrs = deadline_queue_debugfs_attrs, #endif diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8afe3331777e..a9f6db8abcda 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -58,9 +58,6 @@ struct blk_stat_callback; typedef void (rq_end_io_fn)(struct request *, blk_status_t); -#define BLK_RL_SYNCFULL (1U << 0) -#define BLK_RL_ASYNCFULL (1U << 1) - struct request_list { struct request_queue *q; /* the queue this rl belongs to */ #ifdef CONFIG_BLK_CGROUP @@ -309,11 +306,8 @@ static inline unsigned short req_get_ioprio(struct request *req) struct blk_queue_ctx; -typedef void (request_fn_proc) (struct request_queue *q); typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); -typedef int (prep_rq_fn) (struct request_queue *, struct request *); -typedef void (unprep_rq_fn) (struct request_queue *, struct request *); struct bio_vec; typedef void (softirq_done_fn)(struct request *); @@ -432,8 +426,6 @@ struct request_queue { struct list_head queue_head; struct request *last_merge; struct elevator_queue *elevator; - int nr_rqs[2]; /* # allocated [a]sync rqs */ - int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ struct blk_queue_stats *stats; struct rq_qos *rq_qos; @@ -446,11 +438,8 @@ struct request_queue { */ struct request_list root_rl; - request_fn_proc *request_fn; make_request_fn *make_request_fn; poll_q_fn *poll_fn; - prep_rq_fn *prep_rq_fn; - unprep_rq_fn *unprep_rq_fn; softirq_done_fn *softirq_done_fn; rq_timed_out_fn *rq_timed_out_fn; dma_drain_needed_fn *dma_drain_needed; @@ -458,8 +447,6 @@ struct request_queue { init_rq_fn *init_rq_fn; /* Called just before a request is freed */ exit_rq_fn *exit_rq_fn; - /* Called from inside blk_get_request() */ - void (*initialize_rq_fn)(struct request *rq); const struct blk_mq_ops *mq_ops; @@ -475,17 +462,6 @@ struct request_queue { struct blk_mq_hw_ctx **queue_hw_ctx; unsigned int nr_hw_queues; - /* - * Dispatch queue sorting - */ - sector_t end_sector; - struct request *boundary_rq; - - /* - * Delayed queue handling - */ - struct delayed_work delay_work; - struct backing_dev_info *backing_dev_info; /* @@ -548,9 +524,6 @@ struct request_queue { * queue settings */ unsigned long nr_requests; /* Max # of requests */ - unsigned int nr_congestion_on; - unsigned int nr_congestion_off; - unsigned int nr_batching; unsigned int dma_drain_size; void *dma_drain_buffer; @@ -560,13 +533,6 @@ struct request_queue { unsigned int nr_sorted; unsigned int in_flight[2]; - /* - * Number of active block driver functions for which blk_drain_queue() - * must wait. Must be incremented around functions that unlock the - * queue_lock internally, e.g. scsi_request_fn(). - */ - unsigned int request_fn_active; - unsigned int rq_timeout; int poll_nsec; @@ -740,11 +706,6 @@ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); extern void blk_set_pm_only(struct request_queue *q); extern void blk_clear_pm_only(struct request_queue *q); -static inline int queue_in_flight(struct request_queue *q) -{ - return q->in_flight[0] + q->in_flight[1]; -} - static inline bool blk_account_rq(struct request *rq) { return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); @@ -765,7 +726,7 @@ static inline bool blk_account_rq(struct request *rq) */ static inline bool queue_is_rq_based(struct request_queue *q) { - return q->request_fn || q->mq_ops; + return q->mq_ops; } static inline unsigned int blk_queue_cluster(struct request_queue *q) @@ -828,27 +789,6 @@ static inline bool rq_is_sync(struct request *rq) return op_is_sync(rq->cmd_flags); } -static inline bool blk_rl_full(struct request_list *rl, bool sync) -{ - unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; - - return rl->flags & flag; -} - -static inline void blk_set_rl_full(struct request_list *rl, bool sync) -{ - unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; - - rl->flags |= flag; -} - -static inline void blk_clear_rl_full(struct request_list *rl, bool sync) -{ - unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; - - rl->flags &= ~flag; -} - static inline bool rq_mergeable(struct request *rq) { if (blk_rq_is_passthrough(rq)) @@ -969,7 +909,6 @@ extern void blk_put_request(struct request *); extern void __blk_put_request(struct request_queue *, struct request *); extern struct request *blk_get_request(struct request_queue *, unsigned int op, blk_mq_req_flags_t flags); -extern void blk_requeue_request(struct request_queue *, struct request *); extern int blk_lld_busy(struct request_queue *q); extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, struct bio_set *bs, gfp_t gfp_mask, @@ -979,7 +918,6 @@ extern void blk_rq_unprep_clone(struct request *rq); extern blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *rq); extern int blk_rq_append_bio(struct request *rq, struct bio **bio); -extern void blk_delay_queue(struct request_queue *, unsigned long); extern void blk_queue_split(struct request_queue *, struct bio **); extern void blk_recount_segments(struct request_queue *, struct bio *); extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); @@ -992,15 +930,7 @@ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); extern void blk_queue_exit(struct request_queue *q); -extern void blk_start_queue(struct request_queue *q); -extern void blk_start_queue_async(struct request_queue *q); -extern void blk_stop_queue(struct request_queue *q); extern void blk_sync_queue(struct request_queue *q); -extern void __blk_stop_queue(struct request_queue *q); -extern void __blk_run_queue(struct request_queue *q); -extern void __blk_run_queue_uncond(struct request_queue *q); -extern void blk_run_queue(struct request_queue *); -extern void blk_run_queue_async(struct request_queue *q); extern int blk_rq_map_user(struct request_queue *, struct request *, struct rq_map_data *, void __user *, unsigned long, gfp_t); @@ -1155,13 +1085,6 @@ static inline unsigned int blk_rq_count_bios(struct request *rq) return nr_bios; } -/* - * Request issue related functions. - */ -extern struct request *blk_peek_request(struct request_queue *q); -extern void blk_start_request(struct request *rq); -extern struct request *blk_fetch_request(struct request_queue *q); - void blk_steal_bios(struct bio_list *list, struct request *rq); /* @@ -1179,9 +1102,6 @@ void blk_steal_bios(struct bio_list *list, struct request *rq); */ extern bool blk_update_request(struct request *rq, blk_status_t error, unsigned int nr_bytes); -extern void blk_finish_request(struct request *rq, blk_status_t error); -extern bool blk_end_request(struct request *rq, blk_status_t error, - unsigned int nr_bytes); extern void blk_end_request_all(struct request *rq, blk_status_t error); extern bool __blk_end_request(struct request *rq, blk_status_t error, unsigned int nr_bytes); @@ -1190,15 +1110,10 @@ extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); extern void __blk_complete_request(struct request *); extern void blk_abort_request(struct request *); -extern void blk_unprep_request(struct request *); /* * Access functions for manipulating queue properties */ -extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, - spinlock_t *lock, int node_id); -extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); -extern int blk_init_allocated_queue(struct request_queue *); extern void blk_cleanup_queue(struct request_queue *); extern void blk_queue_make_request(struct request_queue *, make_request_fn *); extern void blk_queue_bounce_limit(struct request_queue *, u64); @@ -1239,8 +1154,6 @@ extern int blk_queue_dma_drain(struct request_queue *q, void *buf, unsigned int size); extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); extern void blk_queue_virt_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_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 *); @@ -1298,7 +1211,6 @@ extern void blk_set_queue_dying(struct request_queue *); * schedule() where blk_schedule_flush_plug() is called. */ struct blk_plug { - struct list_head list; /* requests */ struct list_head mq_list; /* blk-mq requests */ struct list_head cb_list; /* md requires an unplug callback */ }; @@ -1339,8 +1251,7 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk) struct blk_plug *plug = tsk->plug; return plug && - (!list_empty(&plug->list) || - !list_empty(&plug->mq_list) || + (!list_empty(&plug->mq_list) || !list_empty(&plug->cb_list)); } diff --git a/include/linux/elevator.h b/include/linux/elevator.h index 015bb59c0331..158004f1754d 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -23,74 +23,6 @@ enum elv_merge { ELEVATOR_DISCARD_MERGE = 3, }; -typedef enum elv_merge (elevator_merge_fn) (struct request_queue *, struct request **, - struct bio *); - -typedef void (elevator_merge_req_fn) (struct request_queue *, struct request *, struct request *); - -typedef void (elevator_merged_fn) (struct request_queue *, struct request *, enum elv_merge); - -typedef int (elevator_allow_bio_merge_fn) (struct request_queue *, - struct request *, struct bio *); - -typedef int (elevator_allow_rq_merge_fn) (struct request_queue *, - struct request *, struct request *); - -typedef void (elevator_bio_merged_fn) (struct request_queue *, - struct request *, struct bio *); - -typedef int (elevator_dispatch_fn) (struct request_queue *, int); - -typedef void (elevator_add_req_fn) (struct request_queue *, struct request *); -typedef struct request *(elevator_request_list_fn) (struct request_queue *, struct request *); -typedef void (elevator_completed_req_fn) (struct request_queue *, struct request *); -typedef int (elevator_may_queue_fn) (struct request_queue *, unsigned int); - -typedef void (elevator_init_icq_fn) (struct io_cq *); -typedef void (elevator_exit_icq_fn) (struct io_cq *); -typedef int (elevator_set_req_fn) (struct request_queue *, struct request *, - struct bio *, gfp_t); -typedef void (elevator_put_req_fn) (struct request *); -typedef void (elevator_activate_req_fn) (struct request_queue *, struct request *); -typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct request *); - -typedef int (elevator_init_fn) (struct request_queue *, - struct elevator_type *e); -typedef void (elevator_exit_fn) (struct elevator_queue *); -typedef void (elevator_registered_fn) (struct request_queue *); - -struct elevator_ops -{ - elevator_merge_fn *elevator_merge_fn; - elevator_merged_fn *elevator_merged_fn; - elevator_merge_req_fn *elevator_merge_req_fn; - elevator_allow_bio_merge_fn *elevator_allow_bio_merge_fn; - elevator_allow_rq_merge_fn *elevator_allow_rq_merge_fn; - elevator_bio_merged_fn *elevator_bio_merged_fn; - - elevator_dispatch_fn *elevator_dispatch_fn; - elevator_add_req_fn *elevator_add_req_fn; - elevator_activate_req_fn *elevator_activate_req_fn; - elevator_deactivate_req_fn *elevator_deactivate_req_fn; - - elevator_completed_req_fn *elevator_completed_req_fn; - - elevator_request_list_fn *elevator_former_req_fn; - elevator_request_list_fn *elevator_latter_req_fn; - - elevator_init_icq_fn *elevator_init_icq_fn; /* see iocontext.h */ - elevator_exit_icq_fn *elevator_exit_icq_fn; /* ditto */ - - elevator_set_req_fn *elevator_set_req_fn; - elevator_put_req_fn *elevator_put_req_fn; - - elevator_may_queue_fn *elevator_may_queue_fn; - - elevator_init_fn *elevator_init_fn; - elevator_exit_fn *elevator_exit_fn; - elevator_registered_fn *elevator_registered_fn; -}; - struct blk_mq_alloc_data; struct blk_mq_hw_ctx; @@ -138,16 +70,15 @@ struct elevator_type /* fields provided by elevator implementation */ union { - struct elevator_ops sq; struct elevator_mq_ops mq; } ops; + size_t icq_size; /* see iocontext.h */ size_t icq_align; /* ditto */ struct elv_fs_entry *elevator_attrs; char elevator_name[ELV_NAME_MAX]; const char *elevator_alias; struct module *elevator_owner; - bool uses_mq; #ifdef CONFIG_BLK_DEBUG_FS const struct blk_mq_debugfs_attr *queue_debugfs_attrs; const struct blk_mq_debugfs_attr *hctx_debugfs_attrs; @@ -175,40 +106,25 @@ struct elevator_queue struct kobject kobj; struct mutex sysfs_lock; unsigned int registered:1; - unsigned int uses_mq:1; DECLARE_HASHTABLE(hash, ELV_HASH_BITS); }; /* * block elevator interface */ -extern void elv_dispatch_sort(struct request_queue *, struct request *); -extern void elv_dispatch_add_tail(struct request_queue *, struct request *); -extern void elv_add_request(struct request_queue *, struct request *, int); -extern void __elv_add_request(struct request_queue *, struct request *, int); extern enum elv_merge elv_merge(struct request_queue *, struct request **, struct bio *); extern void elv_merge_requests(struct request_queue *, struct request *, struct request *); extern void elv_merged_request(struct request_queue *, struct request *, enum elv_merge); -extern void elv_bio_merged(struct request_queue *q, struct request *, - struct bio *); extern bool elv_attempt_insert_merge(struct request_queue *, struct request *); -extern void elv_requeue_request(struct request_queue *, struct request *); extern struct request *elv_former_request(struct request_queue *, struct request *); extern struct request *elv_latter_request(struct request_queue *, struct request *); -extern int elv_may_queue(struct request_queue *, unsigned int); -extern void elv_completed_request(struct request_queue *, struct request *); -extern int elv_set_request(struct request_queue *q, struct request *rq, - struct bio *bio, gfp_t gfp_mask); -extern void elv_put_request(struct request_queue *, struct request *); -extern void elv_drain_elevator(struct request_queue *); /* * io scheduler registration */ -extern void __init load_default_elevator_module(void); extern int elv_register(struct elevator_type *); extern void elv_unregister(struct elevator_type *); @@ -260,9 +176,5 @@ enum { #define rq_entry_fifo(ptr) list_entry((ptr), struct request, queuelist) #define rq_fifo_clear(rq) list_del_init(&(rq)->queuelist) -#else /* CONFIG_BLOCK */ - -static inline void load_default_elevator_module(void) { } - #endif /* CONFIG_BLOCK */ #endif diff --git a/include/linux/init.h b/include/linux/init.h index 9c2aba1dbabf..5255069f5a9f 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -146,7 +146,6 @@ extern unsigned int reset_devices; /* used by init/main.c */ void setup_arch(char **); void prepare_namespace(void); -void __init load_default_modules(void); int __init init_rootfs(void); #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index d1a5d885ce13..73e02ea5d5d1 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -53,9 +53,6 @@ static void __init handle_initrd(void) ksys_mkdir("/old", 0700); ksys_chdir("/old"); - /* try loading default modules from initrd */ - load_default_modules(); - /* * In case that a resume from disk is carried out by linuxrc or one of * its children, we need to tell the freezer not to wait for us. diff --git a/init/initramfs.c b/init/initramfs.c index 640557788026..96af18fec4d0 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -644,12 +644,6 @@ static int __init populate_rootfs(void) #endif } flush_delayed_fput(); - /* - * Try loading default modules from initramfs. This gives - * us a chance to load before device_initcalls. - */ - load_default_modules(); - return 0; } rootfs_initcall(populate_rootfs); diff --git a/init/main.c b/init/main.c index ee147103ba1b..ca0cdb0c388b 100644 --- a/init/main.c +++ b/init/main.c @@ -996,17 +996,6 @@ static void __init do_pre_smp_initcalls(void) do_one_initcall(initcall_from_entry(fn)); } -/* - * This function requests modules which should be loaded by default and is - * called twice right after initrd is mounted and right before init is - * exec'd. If such modules are on either initrd or rootfs, they will be - * loaded before control is passed to userland. - */ -void __init load_default_modules(void) -{ - load_default_elevator_module(); -} - static int run_init_process(const char *init_filename) { argv_init[0] = init_filename; @@ -1180,5 +1169,4 @@ static noinline void __init kernel_init_freeable(void) */ integrity_load_keys(); - load_default_modules(); } |