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block/blk-core.c
93 KB
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/* |
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* Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1994, Karl Keyte: Added support for disk statistics * Elevator latency, (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE * Queue request tables / lock, selectable elevator, Jens Axboe <axboe@suse.de> |
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* kernel-doc documentation started by NeilBrown <neilb@cse.unsw.edu.au> * - July2000 |
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* bio rewrite, highmem i/o, etc, Jens Axboe <axboe@suse.de> - may 2001 */ /* * This handles all read/write requests to block devices */ |
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#include <linux/kernel.h> #include <linux/module.h> #include <linux/backing-dev.h> #include <linux/bio.h> #include <linux/blkdev.h> |
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#include <linux/blk-mq.h> |
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#include <linux/highmem.h> #include <linux/mm.h> #include <linux/kernel_stat.h> #include <linux/string.h> #include <linux/init.h> |
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#include <linux/completion.h> #include <linux/slab.h> #include <linux/swap.h> #include <linux/writeback.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/fault-inject.h> |
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#include <linux/list_sort.h> |
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#include <linux/delay.h> |
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#include <linux/ratelimit.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/blk-cgroup.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/block.h> |
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|
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#include "blk.h" |
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#include "blk-mq.h" |
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|
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap); |
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap); |
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete); |
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_split); |
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug); |
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|
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DEFINE_IDA(blk_queue_ida); |
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/* * For the allocated request tables */ |
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struct kmem_cache *request_cachep; |
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/* * For queue allocation */ |
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struct kmem_cache *blk_requestq_cachep; |
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/* |
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* Controlling structure to kblockd */ |
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static struct workqueue_struct *kblockd_workqueue; |
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|
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static void blk_clear_congested(struct request_list *rl, int sync) { |
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#ifdef CONFIG_CGROUP_WRITEBACK clear_wb_congested(rl->blkg->wb_congested, sync); #else |
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/* * 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); |
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#endif } static void blk_set_congested(struct request_list *rl, int sync) { |
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#ifdef CONFIG_CGROUP_WRITEBACK set_wb_congested(rl->blkg->wb_congested, sync); #else |
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/* see blk_clear_congested() */ if (rl == &rl->q->root_rl) set_wb_congested(rl->q->backing_dev_info.wb.congested, sync); |
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#endif } |
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void blk_queue_congestion_threshold(struct request_queue *q) |
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{ 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; } |
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/** * blk_get_backing_dev_info - get the address of a queue's backing_dev_info * @bdev: device * * Locates the passed device's request queue and returns the address of its |
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* backing_dev_info. This function can only be called if @bdev is opened * and the return value is never NULL. |
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*/ struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev) { |
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struct request_queue *q = bdev_get_queue(bdev); |
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|
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return &q->backing_dev_info; |
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} |
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EXPORT_SYMBOL(blk_get_backing_dev_info); |
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void blk_rq_init(struct request_queue *q, struct request *rq) |
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{ |
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memset(rq, 0, sizeof(*rq)); |
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INIT_LIST_HEAD(&rq->queuelist); |
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INIT_LIST_HEAD(&rq->timeout_list); |
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rq->cpu = -1; |
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rq->q = q; |
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rq->__sector = (sector_t) -1; |
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INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); |
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rq->cmd = rq->__cmd; |
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rq->cmd_len = BLK_MAX_CDB; |
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rq->tag = -1; |
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rq->start_time = jiffies; |
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set_start_time_ns(rq); |
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rq->part = NULL; |
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} |
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EXPORT_SYMBOL(blk_rq_init); |
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|
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static void req_bio_endio(struct request *rq, struct bio *bio, unsigned int nbytes, int error) |
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{ |
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if (error) |
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bio->bi_error = error; |
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|
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if (unlikely(rq->cmd_flags & REQ_QUIET)) |
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bio_set_flag(bio, BIO_QUIET); |
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|
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bio_advance(bio, nbytes); |
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|
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/* don't actually finish bio if it's part of flush sequence */ |
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if (bio->bi_iter.bi_size == 0 && !(rq->cmd_flags & REQ_FLUSH_SEQ)) |
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bio_endio(bio); |
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} |
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|
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void blk_dump_rq_flags(struct request *rq, char *msg) { int bit; |
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printk(KERN_INFO "%s: dev %s: type=%x, flags=%llx ", msg, |
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rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type, |
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(unsigned long long) rq->cmd_flags); |
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|
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printk(KERN_INFO " sector %llu, nr/cnr %u/%u ", (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq), blk_rq_cur_sectors(rq)); |
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printk(KERN_INFO " bio %p, biotail %p, len %u ", rq->bio, rq->biotail, blk_rq_bytes(rq)); |
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|
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if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
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printk(KERN_INFO " cdb: "); |
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for (bit = 0; bit < BLK_MAX_CDB; bit++) |
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printk("%02x ", rq->cmd[bit]); printk(" "); } } |
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EXPORT_SYMBOL(blk_dump_rq_flags); |
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static void blk_delay_work(struct work_struct *work) |
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{ |
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struct request_queue *q; |
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|
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q = container_of(work, struct request_queue, delay_work.work); spin_lock_irq(q->queue_lock); |
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__blk_run_queue(q); |
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spin_unlock_irq(q->queue_lock); |
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} |
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/** |
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* blk_delay_queue - restart queueing after defined interval * @q: The &struct request_queue in question * @msecs: Delay in msecs |
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* * Description: |
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* Sometimes queueing needs to be postponed for a little while, to allow * resources to come back. This function will make sure that queueing is |
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* restarted around the specified time. Queue lock must be held. |
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*/ void blk_delay_queue(struct request_queue *q, unsigned long msecs) |
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{ |
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if (likely(!blk_queue_dead(q))) queue_delayed_work(kblockd_workqueue, &q->delay_work, msecs_to_jiffies(msecs)); |
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} |
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EXPORT_SYMBOL(blk_delay_queue); |
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|
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/** |
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* 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) { queue_flag_clear(QUEUE_FLAG_STOPPED, q); blk_run_queue_async(q); } EXPORT_SYMBOL(blk_start_queue_async); /** |
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* blk_start_queue - restart a previously stopped queue |
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* @q: The &struct request_queue in question |
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* * 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(). Queue lock must be held. **/ |
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void blk_start_queue(struct request_queue *q) |
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{ |
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WARN_ON(!irqs_disabled()); |
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queue_flag_clear(QUEUE_FLAG_STOPPED, q); |
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__blk_run_queue(q); |
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} |
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EXPORT_SYMBOL(blk_start_queue); /** * blk_stop_queue - stop a queue |
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* @q: The &struct request_queue in question |
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* * 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. Queue lock must be held. **/ |
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void blk_stop_queue(struct request_queue *q) |
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{ |
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cancel_delayed_work(&q->delay_work); |
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queue_flag_set(QUEUE_FLAG_STOPPED, q); |
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} EXPORT_SYMBOL(blk_stop_queue); /** * blk_sync_queue - cancel any pending callbacks on a queue * @q: the queue * * Description: * The block layer may perform asynchronous callback activity * on a queue, such as calling the unplug function after a timeout. * A block device may call blk_sync_queue to ensure that any * such activity is cancelled, thus allowing it to release resources |
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* that the callbacks might use. The caller must already have made sure |
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* that its ->make_request_fn will not re-add plugging prior to calling * this function. * |
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* This function does not cancel any asynchronous activity arising |
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* out of elevator or throttling code. That would require elevator_exit() |
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* and blkcg_exit_queue() to be called with queue lock initialized. |
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* |
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*/ void blk_sync_queue(struct request_queue *q) { |
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del_timer_sync(&q->timeout); |
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if (q->mq_ops) { struct blk_mq_hw_ctx *hctx; int i; |
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queue_for_each_hw_ctx(q, hctx, i) { cancel_delayed_work_sync(&hctx->run_work); cancel_delayed_work_sync(&hctx->delay_work); } |
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} else { cancel_delayed_work_sync(&q->delay_work); } |
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} EXPORT_SYMBOL(blk_sync_queue); /** |
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* __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) { if (unlikely(blk_queue_dead(q))) return; |
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/* * 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++; |
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q->request_fn(q); |
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q->request_fn_active--; |
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} |
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EXPORT_SYMBOL_GPL(__blk_run_queue_uncond); |
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/** |
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* __blk_run_queue - run a single device queue |
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* @q: The queue to run |
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* * Description: * See @blk_run_queue. This variant must be called with the queue lock |
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* held and interrupts disabled. |
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*/ |
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void __blk_run_queue(struct request_queue *q) |
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{ |
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if (unlikely(blk_queue_stopped(q))) return; |
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__blk_run_queue_uncond(q); |
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} EXPORT_SYMBOL(__blk_run_queue); |
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|
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/** |
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* 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 |
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* of us. The caller must hold the queue lock. |
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*/ void blk_run_queue_async(struct request_queue *q) { |
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if (likely(!blk_queue_stopped(q) && !blk_queue_dead(q))) |
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mod_delayed_work(kblockd_workqueue, &q->delay_work, 0); |
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} |
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EXPORT_SYMBOL(blk_run_queue_async); |
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/** |
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* blk_run_queue - run a single device queue * @q: The queue to run |
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* * Description: * Invoke request handling on this queue, if it has pending work to do. |
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* May be used to restart queueing when a request has completed. |
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*/ void blk_run_queue(struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); |
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__blk_run_queue(q); |
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spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_run_queue); |
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void blk_put_queue(struct request_queue *q) |
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{ kobject_put(&q->kobj); } |
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EXPORT_SYMBOL(blk_put_queue); |
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|
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/** |
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* __blk_drain_queue - drain requests from request_queue |
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* @q: queue to drain |
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* @drain_all: whether to drain all requests or only the ones w/ ELVPRIV |
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* |
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* 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. |
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*/ |
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386 387 388 |
static void __blk_drain_queue(struct request_queue *q, bool drain_all) __releases(q->queue_lock) __acquires(q->queue_lock) |
e3c78ca52 block: reorganize... |
389 |
{ |
458f27a98 block: Avoid miss... |
390 |
int i; |
807592a4f block: Let blk_dr... |
391 |
lockdep_assert_held(q->queue_lock); |
e3c78ca52 block: reorganize... |
392 |
while (true) { |
481a7d647 block: fix drain_... |
393 |
bool drain = false; |
e3c78ca52 block: reorganize... |
394 |
|
b855b04a0 block: blk-thrott... |
395 396 397 398 399 400 |
/* * The caller might be trying to drain @q before its * elevator is initialized. */ if (q->elevator) elv_drain_elevator(q); |
5efd61135 blkcg: add blkcg_... |
401 |
blkcg_drain_queue(q); |
e3c78ca52 block: reorganize... |
402 |
|
4eabc9412 block: don't kick... |
403 404 |
/* * This function might be called on a queue which failed |
b855b04a0 block: blk-thrott... |
405 406 407 408 |
* 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. |
4eabc9412 block: don't kick... |
409 |
*/ |
b855b04a0 block: blk-thrott... |
410 |
if (!list_empty(&q->queue_head) && q->request_fn) |
4eabc9412 block: don't kick... |
411 |
__blk_run_queue(q); |
c9a929dde block: fix reques... |
412 |
|
8a5ecdd42 block: add q->nr_... |
413 |
drain |= q->nr_rqs_elvpriv; |
24faf6f60 block: Make blk_c... |
414 |
drain |= q->request_fn_active; |
481a7d647 block: fix drain_... |
415 416 417 418 419 420 421 |
/* * 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) { |
e97c293cd block: introduce ... |
422 |
struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); |
481a7d647 block: fix drain_... |
423 424 |
drain |= !list_empty(&q->queue_head); for (i = 0; i < 2; i++) { |
8a5ecdd42 block: add q->nr_... |
425 |
drain |= q->nr_rqs[i]; |
481a7d647 block: fix drain_... |
426 |
drain |= q->in_flight[i]; |
7c94e1c15 block: introduce ... |
427 428 |
if (fq) drain |= !list_empty(&fq->flush_queue[i]); |
481a7d647 block: fix drain_... |
429 430 |
} } |
e3c78ca52 block: reorganize... |
431 |
|
481a7d647 block: fix drain_... |
432 |
if (!drain) |
e3c78ca52 block: reorganize... |
433 |
break; |
807592a4f block: Let blk_dr... |
434 435 |
spin_unlock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
436 |
msleep(10); |
807592a4f block: Let blk_dr... |
437 438 |
spin_lock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
439 |
} |
458f27a98 block: Avoid miss... |
440 441 442 443 444 445 446 |
/* * 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) { |
a051661ca blkcg: implement ... |
447 |
struct request_list *rl; |
a051661ca blkcg: implement ... |
448 449 450 |
blk_queue_for_each_rl(rl, q) for (i = 0; i < ARRAY_SIZE(rl->wait); i++) wake_up_all(&rl->wait[i]); |
458f27a98 block: Avoid miss... |
451 |
} |
e3c78ca52 block: reorganize... |
452 |
} |
c9a929dde block: fix reques... |
453 |
/** |
d732580b4 block: implement ... |
454 455 456 457 458 |
* 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 |
6ecf23afa block: extend que... |
459 |
* throttled or issued before. On return, it's guaranteed that no request |
80fd99792 blkcg: make sure ... |
460 461 |
* is being throttled or has ELVPRIV set and blk_queue_bypass() %true * inside queue or RCU read lock. |
d732580b4 block: implement ... |
462 463 464 465 |
*/ void blk_queue_bypass_start(struct request_queue *q) { spin_lock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
466 |
q->bypass_depth++; |
d732580b4 block: implement ... |
467 468 |
queue_flag_set(QUEUE_FLAG_BYPASS, q); spin_unlock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
469 470 471 472 473 474 |
/* * 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)) { |
807592a4f block: Let blk_dr... |
475 476 477 |
spin_lock_irq(q->queue_lock); __blk_drain_queue(q, false); spin_unlock_irq(q->queue_lock); |
b82d4b197 blkcg: make reque... |
478 479 480 |
/* ensure blk_queue_bypass() is %true inside RCU read lock */ synchronize_rcu(); } |
d732580b4 block: implement ... |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 |
} 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. */ 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); |
aed3ea94b block: wake up wa... |
499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 |
void blk_set_queue_dying(struct request_queue *q) { queue_flag_set_unlocked(QUEUE_FLAG_DYING, q); if (q->mq_ops) blk_mq_wake_waiters(q); else { struct request_list *rl; blk_queue_for_each_rl(rl, q) { if (rl->rq_pool) { wake_up(&rl->wait[BLK_RW_SYNC]); wake_up(&rl->wait[BLK_RW_ASYNC]); } } } } EXPORT_SYMBOL_GPL(blk_set_queue_dying); |
d732580b4 block: implement ... |
517 |
/** |
c9a929dde block: fix reques... |
518 519 520 |
* blk_cleanup_queue - shutdown a request queue * @q: request queue to shutdown * |
c246e80d8 block: Avoid that... |
521 522 |
* Mark @q DYING, drain all pending requests, mark @q DEAD, destroy and * put it. All future requests will be failed immediately with -ENODEV. |
c94a96ac9 block: Initialize... |
523 |
*/ |
6728cb0e6 block: make core ... |
524 |
void blk_cleanup_queue(struct request_queue *q) |
483f4afc4 [PATCH] fix sysfs... |
525 |
{ |
c9a929dde block: fix reques... |
526 |
spinlock_t *lock = q->queue_lock; |
e3335de94 block: blk_cleanu... |
527 |
|
3f3299d5c block: Rename que... |
528 |
/* mark @q DYING, no new request or merges will be allowed afterwards */ |
483f4afc4 [PATCH] fix sysfs... |
529 |
mutex_lock(&q->sysfs_lock); |
aed3ea94b block: wake up wa... |
530 |
blk_set_queue_dying(q); |
c9a929dde block: fix reques... |
531 |
spin_lock_irq(lock); |
6ecf23afa block: extend que... |
532 |
|
80fd99792 blkcg: make sure ... |
533 |
/* |
3f3299d5c block: Rename que... |
534 |
* A dying queue is permanently in bypass mode till released. Note |
80fd99792 blkcg: make sure ... |
535 536 537 538 539 540 541 |
* that, unlike blk_queue_bypass_start(), we aren't performing * synchronize_rcu() after entering bypass mode to avoid the delay * as some drivers create and destroy a lot of queues while * probing. This is still safe because blk_release_queue() will be * called only after the queue refcnt drops to zero and nothing, * RCU or not, would be traversing the queue by then. */ |
6ecf23afa block: extend que... |
542 543 |
q->bypass_depth++; queue_flag_set(QUEUE_FLAG_BYPASS, q); |
c9a929dde block: fix reques... |
544 545 |
queue_flag_set(QUEUE_FLAG_NOMERGES, q); queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
3f3299d5c block: Rename que... |
546 |
queue_flag_set(QUEUE_FLAG_DYING, q); |
c9a929dde block: fix reques... |
547 548 |
spin_unlock_irq(lock); mutex_unlock(&q->sysfs_lock); |
c246e80d8 block: Avoid that... |
549 550 551 552 |
/* * Drain all requests queued before DYING marking. Set DEAD flag to * prevent that q->request_fn() gets invoked after draining finished. */ |
3ef28e83a block: generic re... |
553 554 555 |
blk_freeze_queue(q); spin_lock_irq(lock); if (!q->mq_ops) |
43a5e4e21 block: blk-mq: su... |
556 |
__blk_drain_queue(q, true); |
c246e80d8 block: Avoid that... |
557 |
queue_flag_set(QUEUE_FLAG_DEAD, q); |
807592a4f block: Let blk_dr... |
558 |
spin_unlock_irq(lock); |
c9a929dde block: fix reques... |
559 |
|
5a48fc147 block: blk_flush_... |
560 561 |
/* for synchronous bio-based driver finish in-flight integrity i/o */ blk_flush_integrity(); |
c9a929dde block: fix reques... |
562 563 564 |
/* @q won't process any more request, flush async actions */ del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer); blk_sync_queue(q); |
45a9c9d90 blk-mq: Fix a use... |
565 566 |
if (q->mq_ops) blk_mq_free_queue(q); |
3ef28e83a block: generic re... |
567 |
percpu_ref_exit(&q->q_usage_counter); |
45a9c9d90 blk-mq: Fix a use... |
568 |
|
5e5cfac0c block: Mitigate l... |
569 570 571 572 |
spin_lock_irq(lock); if (q->queue_lock != &q->__queue_lock) q->queue_lock = &q->__queue_lock; spin_unlock_irq(lock); |
b02176f30 block: don't rele... |
573 |
bdi_unregister(&q->backing_dev_info); |
6cd18e711 block: destroy bd... |
574 |
|
c9a929dde block: fix reques... |
575 |
/* @q is and will stay empty, shutdown and put */ |
483f4afc4 [PATCH] fix sysfs... |
576 577 |
blk_put_queue(q); } |
1da177e4c Linux-2.6.12-rc2 |
578 |
EXPORT_SYMBOL(blk_cleanup_queue); |
271508dba block: allocate r... |
579 580 581 582 583 584 585 586 587 588 589 |
/* Allocate memory local to the request queue */ static void *alloc_request_struct(gfp_t gfp_mask, void *data) { int nid = (int)(long)data; return kmem_cache_alloc_node(request_cachep, gfp_mask, nid); } static void free_request_struct(void *element, void *unused) { kmem_cache_free(request_cachep, element); } |
5b788ce3e block: prepare fo... |
590 591 |
int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
592 |
{ |
1abec4fdb block: make blk_i... |
593 594 |
if (unlikely(rl->rq_pool)) return 0; |
5b788ce3e block: prepare fo... |
595 |
rl->q = q; |
1faa16d22 block: change the... |
596 597 |
rl->count[BLK_RW_SYNC] = rl->count[BLK_RW_ASYNC] = 0; rl->starved[BLK_RW_SYNC] = rl->starved[BLK_RW_ASYNC] = 0; |
1faa16d22 block: change the... |
598 599 |
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]); init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]); |
1da177e4c Linux-2.6.12-rc2 |
600 |
|
271508dba block: allocate r... |
601 602 603 604 |
rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_struct, free_request_struct, (void *)(long)q->node, gfp_mask, q->node); |
1da177e4c Linux-2.6.12-rc2 |
605 606 607 608 609 |
if (!rl->rq_pool) return -ENOMEM; return 0; } |
5b788ce3e block: prepare fo... |
610 611 612 613 614 |
void blk_exit_rl(struct request_list *rl) { if (rl->rq_pool) mempool_destroy(rl->rq_pool); } |
165125e1e [BLOCK] Get rid o... |
615 |
struct request_queue *blk_alloc_queue(gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
616 |
{ |
c304a51bf block: use NUMA_N... |
617 |
return blk_alloc_queue_node(gfp_mask, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
618 619 |
} EXPORT_SYMBOL(blk_alloc_queue); |
1da177e4c Linux-2.6.12-rc2 |
620 |
|
6f3b0e8bc blk-mq: add a fla... |
621 |
int blk_queue_enter(struct request_queue *q, bool nowait) |
3ef28e83a block: generic re... |
622 623 624 625 626 627 |
{ while (true) { int ret; if (percpu_ref_tryget_live(&q->q_usage_counter)) return 0; |
6f3b0e8bc blk-mq: add a fla... |
628 |
if (nowait) |
3ef28e83a block: generic re... |
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 |
return -EBUSY; ret = wait_event_interruptible(q->mq_freeze_wq, !atomic_read(&q->mq_freeze_depth) || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; if (ret) return ret; } } void blk_queue_exit(struct request_queue *q) { percpu_ref_put(&q->q_usage_counter); } static void blk_queue_usage_counter_release(struct percpu_ref *ref) { struct request_queue *q = container_of(ref, struct request_queue, q_usage_counter); wake_up_all(&q->mq_freeze_wq); } |
287922eb0 block: defer time... |
653 654 655 656 657 658 |
static void blk_rq_timed_out_timer(unsigned long data) { struct request_queue *q = (struct request_queue *)data; kblockd_schedule_work(&q->timeout_work); } |
165125e1e [BLOCK] Get rid o... |
659 |
struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) |
1946089a1 [PATCH] NUMA awar... |
660 |
{ |
165125e1e [BLOCK] Get rid o... |
661 |
struct request_queue *q; |
e0bf68dde mm: bdi init hooks |
662 |
int err; |
1946089a1 [PATCH] NUMA awar... |
663 |
|
8324aa91d block: split tag ... |
664 |
q = kmem_cache_alloc_node(blk_requestq_cachep, |
94f6030ca Slab allocators: ... |
665 |
gfp_mask | __GFP_ZERO, node_id); |
1da177e4c Linux-2.6.12-rc2 |
666 667 |
if (!q) return NULL; |
00380a404 block: blk_alloc_... |
668 |
q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask); |
a73f730d0 block, cfq: move ... |
669 |
if (q->id < 0) |
3d2936f45 block: only alloc... |
670 |
goto fail_q; |
a73f730d0 block, cfq: move ... |
671 |
|
54efd50bf block: make gener... |
672 673 674 |
q->bio_split = bioset_create(BIO_POOL_SIZE, 0); if (!q->bio_split) goto fail_id; |
0989a025d block: don't over... |
675 |
q->backing_dev_info.ra_pages = |
09cbfeaf1 mm, fs: get rid o... |
676 |
(VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
89e9b9e07 writeback: add {C... |
677 |
q->backing_dev_info.capabilities = BDI_CAP_CGROUP_WRITEBACK; |
d993831fa writeback: add na... |
678 |
q->backing_dev_info.name = "block"; |
5151412dd block: initialize... |
679 |
q->node = node_id; |
0989a025d block: don't over... |
680 |
|
e0bf68dde mm: bdi init hooks |
681 |
err = bdi_init(&q->backing_dev_info); |
a73f730d0 block, cfq: move ... |
682 |
if (err) |
54efd50bf block: make gener... |
683 |
goto fail_split; |
e0bf68dde mm: bdi init hooks |
684 |
|
31373d09d laptop-mode: Make... |
685 686 |
setup_timer(&q->backing_dev_info.laptop_mode_wb_timer, laptop_mode_timer_fn, (unsigned long) q); |
242f9dcb8 block: unify requ... |
687 |
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); |
b855b04a0 block: blk-thrott... |
688 |
INIT_LIST_HEAD(&q->queue_head); |
242f9dcb8 block: unify requ... |
689 |
INIT_LIST_HEAD(&q->timeout_list); |
a612fddf0 block, cfq: move ... |
690 |
INIT_LIST_HEAD(&q->icq_list); |
4eef30499 blkcg: move per-q... |
691 |
#ifdef CONFIG_BLK_CGROUP |
e8989fae3 blkcg: unify blkg... |
692 |
INIT_LIST_HEAD(&q->blkg_list); |
4eef30499 blkcg: move per-q... |
693 |
#endif |
3cca6dc1c block: add API fo... |
694 |
INIT_DELAYED_WORK(&q->delay_work, blk_delay_work); |
483f4afc4 [PATCH] fix sysfs... |
695 |
|
8324aa91d block: split tag ... |
696 |
kobject_init(&q->kobj, &blk_queue_ktype); |
1da177e4c Linux-2.6.12-rc2 |
697 |
|
483f4afc4 [PATCH] fix sysfs... |
698 |
mutex_init(&q->sysfs_lock); |
e7e72bf64 Remove blkdev war... |
699 |
spin_lock_init(&q->__queue_lock); |
483f4afc4 [PATCH] fix sysfs... |
700 |
|
c94a96ac9 block: Initialize... |
701 702 703 704 705 |
/* * By default initialize queue_lock to internal lock and driver can * override it later if need be. */ q->queue_lock = &q->__queue_lock; |
b82d4b197 blkcg: make reque... |
706 707 708 |
/* * A queue starts its life with bypass turned on to avoid * unnecessary bypass on/off overhead and nasty surprises during |
749fefe67 block: lift the i... |
709 710 |
* init. The initial bypass will be finished when the queue is * registered by blk_register_queue(). |
b82d4b197 blkcg: make reque... |
711 712 713 |
*/ q->bypass_depth = 1; __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); |
320ae51fe blk-mq: new multi... |
714 |
init_waitqueue_head(&q->mq_freeze_wq); |
3ef28e83a block: generic re... |
715 716 717 718 719 720 721 |
/* * Init percpu_ref in atomic mode so that it's faster to shutdown. * See blk_register_queue() for details. */ if (percpu_ref_init(&q->q_usage_counter, blk_queue_usage_counter_release, PERCPU_REF_INIT_ATOMIC, GFP_KERNEL)) |
fff4996b7 blk-core: Fix mem... |
722 |
goto fail_bdi; |
f51b802c1 blkcg: use the us... |
723 |
|
3ef28e83a block: generic re... |
724 725 |
if (blkcg_init_queue(q)) goto fail_ref; |
1da177e4c Linux-2.6.12-rc2 |
726 |
return q; |
a73f730d0 block, cfq: move ... |
727 |
|
3ef28e83a block: generic re... |
728 729 |
fail_ref: percpu_ref_exit(&q->q_usage_counter); |
fff4996b7 blk-core: Fix mem... |
730 731 |
fail_bdi: bdi_destroy(&q->backing_dev_info); |
54efd50bf block: make gener... |
732 733 |
fail_split: bioset_free(q->bio_split); |
a73f730d0 block, cfq: move ... |
734 735 736 737 738 |
fail_id: ida_simple_remove(&blk_queue_ida, q->id); fail_q: kmem_cache_free(blk_requestq_cachep, q); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
739 |
} |
1946089a1 [PATCH] NUMA awar... |
740 |
EXPORT_SYMBOL(blk_alloc_queue_node); |
1da177e4c Linux-2.6.12-rc2 |
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
/** * 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 |
a038e2536 [PATCH] blk_start... |
764 765 |
* request queue; this lock will be taken also from interrupt context, so irq * disabling is needed for it. |
1da177e4c Linux-2.6.12-rc2 |
766 |
* |
710027a48 Add some block/ s... |
767 |
* Function returns a pointer to the initialized request queue, or %NULL if |
1da177e4c Linux-2.6.12-rc2 |
768 769 770 771 772 773 |
* 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). **/ |
1946089a1 [PATCH] NUMA awar... |
774 |
|
165125e1e [BLOCK] Get rid o... |
775 |
struct request_queue *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock) |
1da177e4c Linux-2.6.12-rc2 |
776 |
{ |
c304a51bf block: use NUMA_N... |
777 |
return blk_init_queue_node(rfn, lock, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
778 779 |
} EXPORT_SYMBOL(blk_init_queue); |
165125e1e [BLOCK] Get rid o... |
780 |
struct request_queue * |
1946089a1 [PATCH] NUMA awar... |
781 782 |
blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { |
c86d1b8ae block: avoid unco... |
783 |
struct request_queue *uninit_q, *q; |
1da177e4c Linux-2.6.12-rc2 |
784 |
|
c86d1b8ae block: avoid unco... |
785 786 787 |
uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id); if (!uninit_q) return NULL; |
5151412dd block: initialize... |
788 |
q = blk_init_allocated_queue(uninit_q, rfn, lock); |
c86d1b8ae block: avoid unco... |
789 |
if (!q) |
7982e90c3 block: fix q->flu... |
790 |
blk_cleanup_queue(uninit_q); |
18741986a blk-mq: rework fl... |
791 |
|
7982e90c3 block: fix q->flu... |
792 |
return q; |
01effb0dc block: allow init... |
793 794 |
} EXPORT_SYMBOL(blk_init_queue_node); |
dece16353 block: change ->m... |
795 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio); |
336b7e1f2 block: remove exp... |
796 |
|
01effb0dc block: allow init... |
797 798 799 800 |
struct request_queue * blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn, spinlock_t *lock) { |
1da177e4c Linux-2.6.12-rc2 |
801 802 |
if (!q) return NULL; |
f70ced091 blk-mq: support p... |
803 |
q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, 0); |
ba483388e block: remove blk... |
804 |
if (!q->fq) |
7982e90c3 block: fix q->flu... |
805 |
return NULL; |
a051661ca blkcg: implement ... |
806 |
if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) |
708f04d2a block: free q->fl... |
807 |
goto fail; |
1da177e4c Linux-2.6.12-rc2 |
808 |
|
287922eb0 block: defer time... |
809 |
INIT_WORK(&q->timeout_work, blk_timeout_work); |
1da177e4c Linux-2.6.12-rc2 |
810 |
q->request_fn = rfn; |
1da177e4c Linux-2.6.12-rc2 |
811 |
q->prep_rq_fn = NULL; |
28018c242 block: implement ... |
812 |
q->unprep_rq_fn = NULL; |
60ea8226c block: fix reques... |
813 |
q->queue_flags |= QUEUE_FLAG_DEFAULT; |
c94a96ac9 block: Initialize... |
814 815 816 817 |
/* Override internal queue lock with supplied lock pointer */ if (lock) q->queue_lock = lock; |
1da177e4c Linux-2.6.12-rc2 |
818 |
|
f3b144aa7 block: remove var... |
819 820 821 |
/* * This also sets hw/phys segments, boundary and size */ |
c20e8de27 block: rename __m... |
822 |
blk_queue_make_request(q, blk_queue_bio); |
1da177e4c Linux-2.6.12-rc2 |
823 |
|
44ec95425 [SCSI] sg: cap re... |
824 |
q->sg_reserved_size = INT_MAX; |
eb1c160b2 elevator: Fix a r... |
825 826 |
/* Protect q->elevator from elevator_change */ mutex_lock(&q->sysfs_lock); |
b82d4b197 blkcg: make reque... |
827 |
/* init elevator */ |
eb1c160b2 elevator: Fix a r... |
828 829 |
if (elevator_init(q, NULL)) { mutex_unlock(&q->sysfs_lock); |
708f04d2a block: free q->fl... |
830 |
goto fail; |
eb1c160b2 elevator: Fix a r... |
831 832 833 |
} mutex_unlock(&q->sysfs_lock); |
b82d4b197 blkcg: make reque... |
834 |
return q; |
708f04d2a block: free q->fl... |
835 836 |
fail: |
ba483388e block: remove blk... |
837 |
blk_free_flush_queue(q->fq); |
708f04d2a block: free q->fl... |
838 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
839 |
} |
5151412dd block: initialize... |
840 |
EXPORT_SYMBOL(blk_init_allocated_queue); |
1da177e4c Linux-2.6.12-rc2 |
841 |
|
09ac46c42 block: misc updat... |
842 |
bool blk_get_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
843 |
{ |
3f3299d5c block: Rename que... |
844 |
if (likely(!blk_queue_dying(q))) { |
09ac46c42 block: misc updat... |
845 846 |
__blk_get_queue(q); return true; |
1da177e4c Linux-2.6.12-rc2 |
847 |
} |
09ac46c42 block: misc updat... |
848 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
849 |
} |
d86e0e83b block: export blk... |
850 |
EXPORT_SYMBOL(blk_get_queue); |
1da177e4c Linux-2.6.12-rc2 |
851 |
|
5b788ce3e block: prepare fo... |
852 |
static inline void blk_free_request(struct request_list *rl, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
853 |
{ |
f1f8cc946 block, cfq: move ... |
854 |
if (rq->cmd_flags & REQ_ELVPRIV) { |
5b788ce3e block: prepare fo... |
855 |
elv_put_request(rl->q, rq); |
f1f8cc946 block, cfq: move ... |
856 |
if (rq->elv.icq) |
11a3122f6 block: strip out ... |
857 |
put_io_context(rq->elv.icq->ioc); |
f1f8cc946 block, cfq: move ... |
858 |
} |
5b788ce3e block: prepare fo... |
859 |
mempool_free(rq, rl->rq_pool); |
1da177e4c Linux-2.6.12-rc2 |
860 |
} |
1da177e4c Linux-2.6.12-rc2 |
861 862 863 864 |
/* * ioc_batching returns true if the ioc is a valid batching request and * should be given priority access to a request. */ |
165125e1e [BLOCK] Get rid o... |
865 |
static inline int ioc_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 |
{ 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. */ |
165125e1e [BLOCK] Get rid o... |
886 |
static void ioc_set_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
887 888 889 890 891 892 893 |
{ if (!ioc || ioc_batching(q, ioc)) return; ioc->nr_batch_requests = q->nr_batching; ioc->last_waited = jiffies; } |
5b788ce3e block: prepare fo... |
894 |
static void __freed_request(struct request_list *rl, int sync) |
1da177e4c Linux-2.6.12-rc2 |
895 |
{ |
5b788ce3e block: prepare fo... |
896 |
struct request_queue *q = rl->q; |
1da177e4c Linux-2.6.12-rc2 |
897 |
|
d40f75a06 writeback, blkcg:... |
898 899 |
if (rl->count[sync] < queue_congestion_off_threshold(q)) blk_clear_congested(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
900 |
|
1faa16d22 block: change the... |
901 902 903 |
if (rl->count[sync] + 1 <= q->nr_requests) { if (waitqueue_active(&rl->wait[sync])) wake_up(&rl->wait[sync]); |
1da177e4c Linux-2.6.12-rc2 |
904 |
|
5b788ce3e block: prepare fo... |
905 |
blk_clear_rl_full(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
906 907 908 909 910 911 912 |
} } /* * A request has just been released. Account for it, update the full and * congestion status, wake up any waiters. Called under q->queue_lock. */ |
e6a40b096 block: prepare re... |
913 |
static void freed_request(struct request_list *rl, int op, unsigned int flags) |
1da177e4c Linux-2.6.12-rc2 |
914 |
{ |
5b788ce3e block: prepare fo... |
915 |
struct request_queue *q = rl->q; |
d9d8c5c48 block: convert is... |
916 |
int sync = rw_is_sync(op, flags); |
1da177e4c Linux-2.6.12-rc2 |
917 |
|
8a5ecdd42 block: add q->nr_... |
918 |
q->nr_rqs[sync]--; |
1faa16d22 block: change the... |
919 |
rl->count[sync]--; |
75eb6c372 block: pass aroun... |
920 |
if (flags & REQ_ELVPRIV) |
8a5ecdd42 block: add q->nr_... |
921 |
q->nr_rqs_elvpriv--; |
1da177e4c Linux-2.6.12-rc2 |
922 |
|
5b788ce3e block: prepare fo... |
923 |
__freed_request(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
924 |
|
1faa16d22 block: change the... |
925 |
if (unlikely(rl->starved[sync ^ 1])) |
5b788ce3e block: prepare fo... |
926 |
__freed_request(rl, sync ^ 1); |
1da177e4c Linux-2.6.12-rc2 |
927 |
} |
e3a2b3f93 blk-mq: allow cha... |
928 929 930 |
int blk_update_nr_requests(struct request_queue *q, unsigned int nr) { struct request_list *rl; |
d40f75a06 writeback, blkcg:... |
931 |
int on_thresh, off_thresh; |
e3a2b3f93 blk-mq: allow cha... |
932 933 934 935 |
spin_lock_irq(q->queue_lock); q->nr_requests = nr; blk_queue_congestion_threshold(q); |
d40f75a06 writeback, blkcg:... |
936 937 |
on_thresh = queue_congestion_on_threshold(q); off_thresh = queue_congestion_off_threshold(q); |
e3a2b3f93 blk-mq: allow cha... |
938 |
|
d40f75a06 writeback, blkcg:... |
939 940 941 942 943 |
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); |
e3a2b3f93 blk-mq: allow cha... |
944 |
|
d40f75a06 writeback, blkcg:... |
945 946 947 948 |
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); |
e3a2b3f93 blk-mq: allow cha... |
949 |
|
e3a2b3f93 blk-mq: allow cha... |
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
968 |
/* |
9d5a4e946 block: skip eleva... |
969 970 971 972 973 974 975 976 977 978 979 980 |
* Determine if elevator data should be initialized when allocating the * request associated with @bio. */ static bool blk_rq_should_init_elevator(struct bio *bio) { if (!bio) return true; /* * Flush requests do not use the elevator so skip initialization. * This allows a request to share the flush and elevator data. */ |
1eff9d322 block: rename bio... |
981 |
if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) |
9d5a4e946 block: skip eleva... |
982 983 984 985 |
return false; return true; } |
da8303c63 block: make get_r... |
986 |
/** |
852c788f8 block: implement ... |
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 |
* rq_ioc - determine io_context for request allocation * @bio: request being allocated is for this bio (can be %NULL) * * Determine io_context to use for request allocation for @bio. May return * %NULL if %current->io_context doesn't exist. */ static struct io_context *rq_ioc(struct bio *bio) { #ifdef CONFIG_BLK_CGROUP if (bio && bio->bi_ioc) return bio->bi_ioc; #endif return current->io_context; } /** |
a06e05e6a block: refactor g... |
1003 |
* __get_request - get a free request |
5b788ce3e block: prepare fo... |
1004 |
* @rl: request list to allocate from |
e6a40b096 block: prepare re... |
1005 1006 |
* @op: REQ_OP_READ/REQ_OP_WRITE * @op_flags: rq_flag_bits |
da8303c63 block: make get_r... |
1007 1008 1009 1010 1011 1012 |
* @bio: bio to allocate request for (can be %NULL) * @gfp_mask: allocation mask * * Get a free request from @q. This function may fail under memory * pressure or if @q is dead. * |
da3dae54e Documentation: Do... |
1013 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1014 1015 |
* Returns ERR_PTR on failure, with @q->queue_lock held. * Returns request pointer on success, with @q->queue_lock *not held*. |
1da177e4c Linux-2.6.12-rc2 |
1016 |
*/ |
e6a40b096 block: prepare re... |
1017 1018 1019 |
static struct request *__get_request(struct request_list *rl, int op, int op_flags, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1020 |
{ |
5b788ce3e block: prepare fo... |
1021 |
struct request_queue *q = rl->q; |
b679281a6 block: restructur... |
1022 |
struct request *rq; |
7f4b35d15 block: allocate i... |
1023 1024 |
struct elevator_type *et = q->elevator->type; struct io_context *ioc = rq_ioc(bio); |
f1f8cc946 block, cfq: move ... |
1025 |
struct io_cq *icq = NULL; |
d9d8c5c48 block: convert is... |
1026 |
const bool is_sync = rw_is_sync(op, op_flags) != 0; |
75eb6c372 block: pass aroun... |
1027 |
int may_queue; |
88ee5ef15 [BLOCK] ll_rw_blk... |
1028 |
|
3f3299d5c block: Rename que... |
1029 |
if (unlikely(blk_queue_dying(q))) |
a492f0754 block,scsi: fixup... |
1030 |
return ERR_PTR(-ENODEV); |
da8303c63 block: make get_r... |
1031 |
|
ba568ea0a block: prepare el... |
1032 |
may_queue = elv_may_queue(q, op, op_flags); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1033 1034 |
if (may_queue == ELV_MQUEUE_NO) goto rq_starved; |
1faa16d22 block: change the... |
1035 1036 |
if (rl->count[is_sync]+1 >= queue_congestion_on_threshold(q)) { if (rl->count[is_sync]+1 >= q->nr_requests) { |
f2dbd76a0 block, cfq: repla... |
1037 |
/* |
88ee5ef15 [BLOCK] ll_rw_blk... |
1038 1039 1040 1041 1042 |
* 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. */ |
5b788ce3e block: prepare fo... |
1043 |
if (!blk_rl_full(rl, is_sync)) { |
88ee5ef15 [BLOCK] ll_rw_blk... |
1044 |
ioc_set_batching(q, ioc); |
5b788ce3e block: prepare fo... |
1045 |
blk_set_rl_full(rl, is_sync); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1046 1047 1048 1049 1050 1051 1052 1053 |
} 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 */ |
a492f0754 block,scsi: fixup... |
1054 |
return ERR_PTR(-ENOMEM); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1055 1056 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1057 |
} |
d40f75a06 writeback, blkcg:... |
1058 |
blk_set_congested(rl, is_sync); |
1da177e4c Linux-2.6.12-rc2 |
1059 |
} |
082cf69eb [PATCH] ll_rw_blk... |
1060 1061 1062 1063 1064 |
/* * 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 */ |
1faa16d22 block: change the... |
1065 |
if (rl->count[is_sync] >= (3 * q->nr_requests / 2)) |
a492f0754 block,scsi: fixup... |
1066 |
return ERR_PTR(-ENOMEM); |
fd782a4a9 [PATCH] Fix get_r... |
1067 |
|
8a5ecdd42 block: add q->nr_... |
1068 |
q->nr_rqs[is_sync]++; |
1faa16d22 block: change the... |
1069 1070 |
rl->count[is_sync]++; rl->starved[is_sync] = 0; |
cb98fc8bb [BLOCK] Reimpleme... |
1071 |
|
f1f8cc946 block, cfq: move ... |
1072 1073 |
/* * Decide whether the new request will be managed by elevator. If |
e6a40b096 block: prepare re... |
1074 |
* so, mark @op_flags and increment elvpriv. Non-zero elvpriv will |
f1f8cc946 block, cfq: move ... |
1075 1076 1077 1078 1079 1080 1081 |
* 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. * * Also, lookup icq while holding queue_lock. If it doesn't exist, * it will be created after releasing queue_lock. */ |
d732580b4 block: implement ... |
1082 |
if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) { |
e6a40b096 block: prepare re... |
1083 |
op_flags |= REQ_ELVPRIV; |
8a5ecdd42 block: add q->nr_... |
1084 |
q->nr_rqs_elvpriv++; |
f1f8cc946 block, cfq: move ... |
1085 1086 |
if (et->icq_cache && ioc) icq = ioc_lookup_icq(ioc, q); |
9d5a4e946 block: skip eleva... |
1087 |
} |
cb98fc8bb [BLOCK] Reimpleme... |
1088 |
|
f253b86b4 Revert "block: fi... |
1089 |
if (blk_queue_io_stat(q)) |
e6a40b096 block: prepare re... |
1090 |
op_flags |= REQ_IO_STAT; |
1da177e4c Linux-2.6.12-rc2 |
1091 |
spin_unlock_irq(q->queue_lock); |
29e2b09ab block: collapse b... |
1092 |
/* allocate and init request */ |
5b788ce3e block: prepare fo... |
1093 |
rq = mempool_alloc(rl->rq_pool, gfp_mask); |
29e2b09ab block: collapse b... |
1094 |
if (!rq) |
b679281a6 block: restructur... |
1095 |
goto fail_alloc; |
1da177e4c Linux-2.6.12-rc2 |
1096 |
|
29e2b09ab block: collapse b... |
1097 |
blk_rq_init(q, rq); |
a051661ca blkcg: implement ... |
1098 |
blk_rq_set_rl(rq, rl); |
e6a40b096 block: prepare re... |
1099 |
req_set_op_attrs(rq, op, op_flags | REQ_ALLOCED); |
29e2b09ab block: collapse b... |
1100 |
|
aaf7c6806 block: fix elvpri... |
1101 |
/* init elvpriv */ |
e6a40b096 block: prepare re... |
1102 |
if (op_flags & REQ_ELVPRIV) { |
aaf7c6806 block: fix elvpri... |
1103 |
if (unlikely(et->icq_cache && !icq)) { |
7f4b35d15 block: allocate i... |
1104 1105 |
if (ioc) icq = ioc_create_icq(ioc, q, gfp_mask); |
aaf7c6806 block: fix elvpri... |
1106 1107 |
if (!icq) goto fail_elvpriv; |
29e2b09ab block: collapse b... |
1108 |
} |
aaf7c6806 block: fix elvpri... |
1109 1110 1111 1112 1113 1114 |
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 */ |
29e2b09ab block: collapse b... |
1115 1116 1117 |
if (icq) get_io_context(icq->ioc); } |
aaf7c6806 block: fix elvpri... |
1118 |
out: |
88ee5ef15 [BLOCK] ll_rw_blk... |
1119 1120 1121 1122 1123 1124 |
/* * 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. */ |
1da177e4c Linux-2.6.12-rc2 |
1125 1126 |
if (ioc_batching(q, ioc)) ioc->nr_batch_requests--; |
6728cb0e6 block: make core ... |
1127 |
|
e6a40b096 block: prepare re... |
1128 |
trace_block_getrq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1129 |
return rq; |
b679281a6 block: restructur... |
1130 |
|
aaf7c6806 block: fix elvpri... |
1131 1132 1133 1134 1135 1136 1137 |
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. */ |
7b2b10e0e block: include fu... |
1138 1139 1140 |
printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed ", __func__, dev_name(q->backing_dev_info.dev)); |
aaf7c6806 block: fix elvpri... |
1141 1142 1143 1144 1145 |
rq->cmd_flags &= ~REQ_ELVPRIV; rq->elv.icq = NULL; spin_lock_irq(q->queue_lock); |
8a5ecdd42 block: add q->nr_... |
1146 |
q->nr_rqs_elvpriv--; |
aaf7c6806 block: fix elvpri... |
1147 1148 |
spin_unlock_irq(q->queue_lock); goto out; |
b679281a6 block: restructur... |
1149 1150 1151 1152 1153 1154 1155 1156 1157 |
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); |
e6a40b096 block: prepare re... |
1158 |
freed_request(rl, op, op_flags); |
b679281a6 block: restructur... |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 |
/* * 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; |
a492f0754 block,scsi: fixup... |
1170 |
return ERR_PTR(-ENOMEM); |
1da177e4c Linux-2.6.12-rc2 |
1171 |
} |
da8303c63 block: make get_r... |
1172 |
/** |
a06e05e6a block: refactor g... |
1173 |
* get_request - get a free request |
da8303c63 block: make get_r... |
1174 |
* @q: request_queue to allocate request from |
e6a40b096 block: prepare re... |
1175 1176 |
* @op: REQ_OP_READ/REQ_OP_WRITE * @op_flags: rq_flag_bits |
da8303c63 block: make get_r... |
1177 |
* @bio: bio to allocate request for (can be %NULL) |
a06e05e6a block: refactor g... |
1178 |
* @gfp_mask: allocation mask |
da8303c63 block: make get_r... |
1179 |
* |
d0164adc8 mm, page_alloc: d... |
1180 1181 |
* Get a free request from @q. If %__GFP_DIRECT_RECLAIM is set in @gfp_mask, * this function keeps retrying under memory pressure and fails iff @q is dead. |
d6344532a [PATCH] blk: redu... |
1182 |
* |
da3dae54e Documentation: Do... |
1183 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1184 1185 |
* Returns ERR_PTR on failure, with @q->queue_lock held. * Returns request pointer on success, with @q->queue_lock *not held*. |
1da177e4c Linux-2.6.12-rc2 |
1186 |
*/ |
e6a40b096 block: prepare re... |
1187 1188 1189 |
static struct request *get_request(struct request_queue *q, int op, int op_flags, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1190 |
{ |
d9d8c5c48 block: convert is... |
1191 |
const bool is_sync = rw_is_sync(op, op_flags) != 0; |
a06e05e6a block: refactor g... |
1192 |
DEFINE_WAIT(wait); |
a051661ca blkcg: implement ... |
1193 |
struct request_list *rl; |
1da177e4c Linux-2.6.12-rc2 |
1194 |
struct request *rq; |
a051661ca blkcg: implement ... |
1195 1196 |
rl = blk_get_rl(q, bio); /* transferred to @rq on success */ |
a06e05e6a block: refactor g... |
1197 |
retry: |
e6a40b096 block: prepare re... |
1198 |
rq = __get_request(rl, op, op_flags, bio, gfp_mask); |
a492f0754 block,scsi: fixup... |
1199 |
if (!IS_ERR(rq)) |
a06e05e6a block: refactor g... |
1200 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
1201 |
|
d0164adc8 mm, page_alloc: d... |
1202 |
if (!gfpflags_allow_blocking(gfp_mask) || unlikely(blk_queue_dying(q))) { |
a051661ca blkcg: implement ... |
1203 |
blk_put_rl(rl); |
a492f0754 block,scsi: fixup... |
1204 |
return rq; |
a051661ca blkcg: implement ... |
1205 |
} |
1da177e4c Linux-2.6.12-rc2 |
1206 |
|
a06e05e6a block: refactor g... |
1207 1208 1209 |
/* wait on @rl and retry */ prepare_to_wait_exclusive(&rl->wait[is_sync], &wait, TASK_UNINTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1210 |
|
e6a40b096 block: prepare re... |
1211 |
trace_block_sleeprq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1212 |
|
a06e05e6a block: refactor g... |
1213 1214 |
spin_unlock_irq(q->queue_lock); io_schedule(); |
d6344532a [PATCH] blk: redu... |
1215 |
|
a06e05e6a block: refactor g... |
1216 1217 1218 1219 1220 |
/* * 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 */ |
a06e05e6a block: refactor g... |
1221 |
ioc_set_batching(q, current->io_context); |
05caf8dbc block: Move the s... |
1222 |
|
a06e05e6a block: refactor g... |
1223 1224 |
spin_lock_irq(q->queue_lock); finish_wait(&rl->wait[is_sync], &wait); |
1da177e4c Linux-2.6.12-rc2 |
1225 |
|
a06e05e6a block: refactor g... |
1226 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1227 |
} |
320ae51fe blk-mq: new multi... |
1228 1229 |
static struct request *blk_old_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 |
{ struct request *rq; BUG_ON(rw != READ && rw != WRITE); |
7f4b35d15 block: allocate i... |
1234 1235 |
/* create ioc upfront */ create_io_context(gfp_mask, q->node); |
d6344532a [PATCH] blk: redu... |
1236 |
spin_lock_irq(q->queue_lock); |
e6a40b096 block: prepare re... |
1237 |
rq = get_request(q, rw, 0, NULL, gfp_mask); |
0c4de0f33 block: ensure bio... |
1238 |
if (IS_ERR(rq)) { |
da8303c63 block: make get_r... |
1239 |
spin_unlock_irq(q->queue_lock); |
0c4de0f33 block: ensure bio... |
1240 1241 |
return rq; } |
1da177e4c Linux-2.6.12-rc2 |
1242 |
|
0c4de0f33 block: ensure bio... |
1243 1244 1245 1246 |
/* q->queue_lock is unlocked at this point */ rq->__data_len = 0; rq->__sector = (sector_t) -1; rq->bio = rq->biotail = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 |
return rq; } |
320ae51fe blk-mq: new multi... |
1249 1250 1251 1252 |
struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) { if (q->mq_ops) |
6f3b0e8bc blk-mq: add a fla... |
1253 1254 1255 |
return blk_mq_alloc_request(q, rw, (gfp_mask & __GFP_DIRECT_RECLAIM) ? 0 : BLK_MQ_REQ_NOWAIT); |
320ae51fe blk-mq: new multi... |
1256 1257 1258 |
else return blk_old_get_request(q, rw, gfp_mask); } |
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 |
EXPORT_SYMBOL(blk_get_request); /** |
da3dae54e Documentation: Do... |
1262 |
* blk_rq_set_block_pc - initialize a request to type BLOCK_PC |
f27b087b8 block: add blk_rq... |
1263 1264 1265 1266 1267 1268 |
* @rq: request to be initialized * */ void blk_rq_set_block_pc(struct request *rq) { rq->cmd_type = REQ_TYPE_BLOCK_PC; |
f27b087b8 block: add blk_rq... |
1269 |
memset(rq->__cmd, 0, sizeof(rq->__cmd)); |
f27b087b8 block: add blk_rq... |
1270 1271 1272 1273 |
} EXPORT_SYMBOL(blk_rq_set_block_pc); /** |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 1277 1278 1279 1280 1281 1282 |
* 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. */ |
165125e1e [BLOCK] Get rid o... |
1283 |
void blk_requeue_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1284 |
{ |
242f9dcb8 block: unify requ... |
1285 1286 |
blk_delete_timer(rq); blk_clear_rq_complete(rq); |
5f3ea37c7 blktrace: port to... |
1287 |
trace_block_rq_requeue(q, rq); |
2056a782f [PATCH] Block que... |
1288 |
|
125c99bc8 scsi: add new scs... |
1289 |
if (rq->cmd_flags & REQ_QUEUED) |
1da177e4c Linux-2.6.12-rc2 |
1290 |
blk_queue_end_tag(q, rq); |
ba396a6c1 block: fix oops w... |
1291 |
BUG_ON(blk_queued_rq(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1292 1293 |
elv_requeue_request(q, rq); } |
1da177e4c Linux-2.6.12-rc2 |
1294 |
EXPORT_SYMBOL(blk_requeue_request); |
73c101011 block: initial pa... |
1295 1296 1297 |
static void add_acct_request(struct request_queue *q, struct request *rq, int where) { |
320ae51fe blk-mq: new multi... |
1298 |
blk_account_io_start(rq, true); |
7eaceacca block: remove per... |
1299 |
__elv_add_request(q, rq, where); |
73c101011 block: initial pa... |
1300 |
} |
074a7aca7 block: move stats... |
1301 1302 1303 |
static void part_round_stats_single(int cpu, struct hd_struct *part, unsigned long now) { |
7276d02e2 block: only calcu... |
1304 |
int inflight; |
074a7aca7 block: move stats... |
1305 1306 |
if (now == part->stamp) return; |
7276d02e2 block: only calcu... |
1307 1308 |
inflight = part_in_flight(part); if (inflight) { |
074a7aca7 block: move stats... |
1309 |
__part_stat_add(cpu, part, time_in_queue, |
7276d02e2 block: only calcu... |
1310 |
inflight * (now - part->stamp)); |
074a7aca7 block: move stats... |
1311 1312 1313 1314 1315 1316 |
__part_stat_add(cpu, part, io_ticks, (now - part->stamp)); } part->stamp = now; } /** |
496aa8a98 block: fix curren... |
1317 1318 1319 |
* part_round_stats() - Round off the performance stats on a struct disk_stats. * @cpu: cpu number for stats access * @part: target partition |
1da177e4c Linux-2.6.12-rc2 |
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 |
* * The average IO queue length and utilisation statistics are maintained * by observing the current state of the queue length and the amount of * time it has been in this state for. * * Normally, that accounting is done on IO completion, but that can result * in more than a second's worth of IO being accounted for within any one * second, leading to >100% utilisation. To deal with that, we call this * function to do a round-off before returning the results when reading * /proc/diskstats. This accounts immediately for all queue usage up to * the current jiffies and restarts the counters again. */ |
c99590591 block: fix diskst... |
1332 |
void part_round_stats(int cpu, struct hd_struct *part) |
6f2576af5 Enhanced partitio... |
1333 1334 |
{ unsigned long now = jiffies; |
074a7aca7 block: move stats... |
1335 1336 1337 |
if (part->partno) part_round_stats_single(cpu, &part_to_disk(part)->part0, now); part_round_stats_single(cpu, part, now); |
6f2576af5 Enhanced partitio... |
1338 |
} |
074a7aca7 block: move stats... |
1339 |
EXPORT_SYMBOL_GPL(part_round_stats); |
6f2576af5 Enhanced partitio... |
1340 |
|
47fafbc70 block / PM: Repla... |
1341 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
1342 1343 1344 1345 1346 1347 1348 1349 |
static void blk_pm_put_request(struct request *rq) { if (rq->q->dev && !(rq->cmd_flags & REQ_PM) && !--rq->q->nr_pending) pm_runtime_mark_last_busy(rq->q->dev); } #else static inline void blk_pm_put_request(struct request *rq) {} #endif |
1da177e4c Linux-2.6.12-rc2 |
1350 1351 1352 |
/* * queue lock must be held */ |
165125e1e [BLOCK] Get rid o... |
1353 |
void __blk_put_request(struct request_queue *q, struct request *req) |
1da177e4c Linux-2.6.12-rc2 |
1354 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1355 1356 |
if (unlikely(!q)) return; |
1da177e4c Linux-2.6.12-rc2 |
1357 |
|
6f5ba581c blk-mq: divert __... |
1358 1359 1360 1361 |
if (q->mq_ops) { blk_mq_free_request(req); return; } |
c8158819d block: implement ... |
1362 |
blk_pm_put_request(req); |
8922e16cf [PATCH] 01/05 Imp... |
1363 |
elv_completed_request(q, req); |
1cd96c242 block: WARN in __... |
1364 1365 |
/* this is a bio leak */ WARN_ON(req->bio != NULL); |
1da177e4c Linux-2.6.12-rc2 |
1366 1367 1368 1369 |
/* * Request may not have originated from ll_rw_blk. if not, * it didn't come out of our reserved rq pools */ |
49171e5c6 [PATCH] Remove st... |
1370 |
if (req->cmd_flags & REQ_ALLOCED) { |
75eb6c372 block: pass aroun... |
1371 |
unsigned int flags = req->cmd_flags; |
e6a40b096 block: prepare re... |
1372 |
int op = req_op(req); |
a051661ca blkcg: implement ... |
1373 |
struct request_list *rl = blk_rq_rl(req); |
1da177e4c Linux-2.6.12-rc2 |
1374 |
|
1da177e4c Linux-2.6.12-rc2 |
1375 |
BUG_ON(!list_empty(&req->queuelist)); |
360f92c24 block: fix regres... |
1376 |
BUG_ON(ELV_ON_HASH(req)); |
1da177e4c Linux-2.6.12-rc2 |
1377 |
|
a051661ca blkcg: implement ... |
1378 |
blk_free_request(rl, req); |
e6a40b096 block: prepare re... |
1379 |
freed_request(rl, op, flags); |
a051661ca blkcg: implement ... |
1380 |
blk_put_rl(rl); |
1da177e4c Linux-2.6.12-rc2 |
1381 1382 |
} } |
6e39b69e7 [SCSI] export blk... |
1383 |
EXPORT_SYMBOL_GPL(__blk_put_request); |
1da177e4c Linux-2.6.12-rc2 |
1384 1385 |
void blk_put_request(struct request *req) { |
165125e1e [BLOCK] Get rid o... |
1386 |
struct request_queue *q = req->q; |
8922e16cf [PATCH] 01/05 Imp... |
1387 |
|
320ae51fe blk-mq: new multi... |
1388 1389 1390 1391 1392 1393 1394 1395 1396 |
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); } |
1da177e4c Linux-2.6.12-rc2 |
1397 |
} |
1da177e4c Linux-2.6.12-rc2 |
1398 |
EXPORT_SYMBOL(blk_put_request); |
66ac02801 block: don't allo... |
1399 1400 1401 1402 |
/** * blk_add_request_payload - add a payload to a request * @rq: request to update * @page: page backing the payload |
37e58237a block: add offset... |
1403 |
* @offset: offset in page |
66ac02801 block: don't allo... |
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 |
* @len: length of the payload. * * This allows to later add a payload to an already submitted request by * a block driver. The driver needs to take care of freeing the payload * itself. * * Note that this is a quite horrible hack and nothing but handling of * discard requests should ever use it. */ void blk_add_request_payload(struct request *rq, struct page *page, |
37e58237a block: add offset... |
1414 |
int offset, unsigned int len) |
66ac02801 block: don't allo... |
1415 1416 1417 1418 |
{ struct bio *bio = rq->bio; bio->bi_io_vec->bv_page = page; |
37e58237a block: add offset... |
1419 |
bio->bi_io_vec->bv_offset = offset; |
66ac02801 block: don't allo... |
1420 |
bio->bi_io_vec->bv_len = len; |
4f024f379 block: Abstract o... |
1421 |
bio->bi_iter.bi_size = len; |
66ac02801 block: don't allo... |
1422 1423 1424 1425 1426 |
bio->bi_vcnt = 1; bio->bi_phys_segments = 1; rq->__data_len = rq->resid_len = len; rq->nr_phys_segments = 1; |
66ac02801 block: don't allo... |
1427 1428 |
} EXPORT_SYMBOL_GPL(blk_add_request_payload); |
320ae51fe blk-mq: new multi... |
1429 1430 |
bool bio_attempt_back_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1431 |
{ |
1eff9d322 block: rename bio... |
1432 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1433 |
|
73c101011 block: initial pa... |
1434 1435 |
if (!ll_back_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1436 |
trace_block_bio_backmerge(q, req, bio); |
73c101011 block: initial pa... |
1437 1438 1439 1440 1441 1442 |
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); req->biotail->bi_next = bio; req->biotail = bio; |
4f024f379 block: Abstract o... |
1443 |
req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1444 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1445 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1446 1447 |
return true; } |
320ae51fe blk-mq: new multi... |
1448 1449 |
bool bio_attempt_front_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1450 |
{ |
1eff9d322 block: rename bio... |
1451 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1452 |
|
73c101011 block: initial pa... |
1453 1454 |
if (!ll_front_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1455 |
trace_block_bio_frontmerge(q, req, bio); |
73c101011 block: initial pa... |
1456 1457 1458 |
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); |
73c101011 block: initial pa... |
1459 1460 |
bio->bi_next = req->bio; req->bio = bio; |
4f024f379 block: Abstract o... |
1461 1462 |
req->__sector = bio->bi_iter.bi_sector; req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1463 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1464 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1465 1466 |
return true; } |
bd87b5898 block: drop @tsk ... |
1467 |
/** |
320ae51fe blk-mq: new multi... |
1468 |
* blk_attempt_plug_merge - try to merge with %current's plugged list |
bd87b5898 block: drop @tsk ... |
1469 1470 1471 |
* @q: request_queue new bio is being queued at * @bio: new bio being queued * @request_count: out parameter for number of traversed plugged requests |
ccc2600b8 block: fix blk-co... |
1472 1473 1474 |
* @same_queue_rq: pointer to &struct request that gets filled in when * another request associated with @q is found on the plug list * (optional, may be %NULL) |
bd87b5898 block: drop @tsk ... |
1475 1476 1477 1478 1479 |
* * Determine whether @bio being queued on @q can be merged with a request * on %current's plugged list. Returns %true if merge was successful, * otherwise %false. * |
07c2bd373 block: don't call... |
1480 1481 1482 1483 1484 1485 |
* Plugging coalesces IOs from the same issuer for the same purpose without * going through @q->queue_lock. As such it's more of an issuing mechanism * than scheduling, and the request, while may have elvpriv data, is not * added on the elevator at this point. In addition, we don't have * reliable access to the elevator outside queue lock. Only check basic * merging parameters without querying the elevator. |
da41a589f blk-mq: Micro-opt... |
1486 1487 |
* * Caller must ensure !blk_queue_nomerges(q) beforehand. |
73c101011 block: initial pa... |
1488 |
*/ |
320ae51fe blk-mq: new multi... |
1489 |
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
5b3f341f0 blk-mq: make plug... |
1490 1491 |
unsigned int *request_count, struct request **same_queue_rq) |
73c101011 block: initial pa... |
1492 1493 1494 1495 |
{ struct blk_plug *plug; struct request *rq; bool ret = false; |
92f399c72 blk-mq: mq plug l... |
1496 |
struct list_head *plug_list; |
73c101011 block: initial pa... |
1497 |
|
bd87b5898 block: drop @tsk ... |
1498 |
plug = current->plug; |
73c101011 block: initial pa... |
1499 1500 |
if (!plug) goto out; |
56ebdaf2f block: simplify f... |
1501 |
*request_count = 0; |
73c101011 block: initial pa... |
1502 |
|
92f399c72 blk-mq: mq plug l... |
1503 1504 1505 1506 1507 1508 |
if (q->mq_ops) plug_list = &plug->mq_list; else plug_list = &plug->list; list_for_each_entry_reverse(rq, plug_list, queuelist) { |
73c101011 block: initial pa... |
1509 |
int el_ret; |
5b3f341f0 blk-mq: make plug... |
1510 |
if (rq->q == q) { |
1b2e19f17 block: make auto ... |
1511 |
(*request_count)++; |
5b3f341f0 blk-mq: make plug... |
1512 1513 1514 1515 1516 1517 1518 1519 |
/* * Only blk-mq multiple hardware queues case checks the * rq in the same queue, there should be only one such * rq in a queue **/ if (same_queue_rq) *same_queue_rq = rq; } |
56ebdaf2f block: simplify f... |
1520 |
|
07c2bd373 block: don't call... |
1521 |
if (rq->q != q || !blk_rq_merge_ok(rq, bio)) |
73c101011 block: initial pa... |
1522 |
continue; |
050c8ea80 block: separate o... |
1523 |
el_ret = blk_try_merge(rq, bio); |
73c101011 block: initial pa... |
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 |
if (el_ret == ELEVATOR_BACK_MERGE) { ret = bio_attempt_back_merge(q, rq, bio); if (ret) break; } else if (el_ret == ELEVATOR_FRONT_MERGE) { ret = bio_attempt_front_merge(q, rq, bio); if (ret) break; } } out: return ret; } |
0809e3ac6 block: fix plug l... |
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 |
unsigned int blk_plug_queued_count(struct request_queue *q) { struct blk_plug *plug; struct request *rq; struct list_head *plug_list; unsigned int ret = 0; plug = current->plug; if (!plug) goto out; if (q->mq_ops) plug_list = &plug->mq_list; else plug_list = &plug->list; list_for_each_entry(rq, plug_list, queuelist) { if (rq->q == q) ret++; } out: return ret; } |
86db1e297 block: continue l... |
1560 |
void init_request_from_bio(struct request *req, struct bio *bio) |
52d9e6753 [BLOCK] ll_rw_blk... |
1561 |
{ |
4aff5e233 [PATCH] Split str... |
1562 |
req->cmd_type = REQ_TYPE_FS; |
52d9e6753 [BLOCK] ll_rw_blk... |
1563 |
|
1eff9d322 block: rename bio... |
1564 1565 |
req->cmd_flags |= bio->bi_opf & REQ_COMMON_MASK; if (bio->bi_opf & REQ_RAHEAD) |
a82afdfcb block: use the sa... |
1566 |
req->cmd_flags |= REQ_FAILFAST_MASK; |
b31dc66a5 [PATCH] Kill PF_S... |
1567 |
|
52d9e6753 [BLOCK] ll_rw_blk... |
1568 |
req->errors = 0; |
4f024f379 block: Abstract o... |
1569 |
req->__sector = bio->bi_iter.bi_sector; |
52d9e6753 [BLOCK] ll_rw_blk... |
1570 |
req->ioprio = bio_prio(bio); |
bc1c56fde Share code betwee... |
1571 |
blk_rq_bio_prep(req->q, req, bio); |
52d9e6753 [BLOCK] ll_rw_blk... |
1572 |
} |
dece16353 block: change ->m... |
1573 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1574 |
{ |
1eff9d322 block: rename bio... |
1575 |
const bool sync = !!(bio->bi_opf & REQ_SYNC); |
73c101011 block: initial pa... |
1576 |
struct blk_plug *plug; |
e6a40b096 block: prepare re... |
1577 |
int el_ret, rw_flags = 0, where = ELEVATOR_INSERT_SORT; |
73c101011 block: initial pa... |
1578 |
struct request *req; |
56ebdaf2f block: simplify f... |
1579 |
unsigned int request_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
1580 |
|
1da177e4c Linux-2.6.12-rc2 |
1581 1582 1583 1584 1585 1586 |
/* * 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); |
23688bf4f block: ensure to ... |
1587 |
blk_queue_split(q, &bio, q->bio_split); |
ffecfd1a7 block: optionally... |
1588 |
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { |
4246a0b63 block: add a bi_e... |
1589 1590 |
bio->bi_error = -EIO; bio_endio(bio); |
dece16353 block: change ->m... |
1591 |
return BLK_QC_T_NONE; |
ffecfd1a7 block: optionally... |
1592 |
} |
1eff9d322 block: rename bio... |
1593 |
if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) { |
73c101011 block: initial pa... |
1594 |
spin_lock_irq(q->queue_lock); |
ae1b15396 block: reimplemen... |
1595 |
where = ELEVATOR_INSERT_FLUSH; |
28e7d1845 block: drop barri... |
1596 1597 |
goto get_rq; } |
73c101011 block: initial pa... |
1598 1599 1600 1601 |
/* * Check if we can merge with the plugged list before grabbing * any locks. */ |
0809e3ac6 block: fix plug l... |
1602 1603 |
if (!blk_queue_nomerges(q)) { if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) |
dece16353 block: change ->m... |
1604 |
return BLK_QC_T_NONE; |
0809e3ac6 block: fix plug l... |
1605 1606 |
} else request_count = blk_plug_queued_count(q); |
1da177e4c Linux-2.6.12-rc2 |
1607 |
|
73c101011 block: initial pa... |
1608 |
spin_lock_irq(q->queue_lock); |
2056a782f [PATCH] Block que... |
1609 |
|
73c101011 block: initial pa... |
1610 1611 |
el_ret = elv_merge(q, &req, bio); if (el_ret == ELEVATOR_BACK_MERGE) { |
73c101011 block: initial pa... |
1612 |
if (bio_attempt_back_merge(q, req, bio)) { |
07c2bd373 block: don't call... |
1613 |
elv_bio_merged(q, req, bio); |
73c101011 block: initial pa... |
1614 1615 1616 1617 1618 |
if (!attempt_back_merge(q, req)) elv_merged_request(q, req, el_ret); goto out_unlock; } } else if (el_ret == ELEVATOR_FRONT_MERGE) { |
73c101011 block: initial pa... |
1619 |
if (bio_attempt_front_merge(q, req, bio)) { |
07c2bd373 block: don't call... |
1620 |
elv_bio_merged(q, req, bio); |
73c101011 block: initial pa... |
1621 1622 1623 |
if (!attempt_front_merge(q, req)) elv_merged_request(q, req, el_ret); goto out_unlock; |
80a761fd3 block: implement ... |
1624 |
} |
1da177e4c Linux-2.6.12-rc2 |
1625 |
} |
450991bc1 [PATCH] blk: __ma... |
1626 |
get_rq: |
1da177e4c Linux-2.6.12-rc2 |
1627 |
/* |
7749a8d42 [PATCH] Propagate... |
1628 1629 1630 1631 |
* This sync check and mask will be re-done in init_request_from_bio(), * but we need to set it earlier to expose the sync flag to the * rq allocator and io schedulers. */ |
7749a8d42 [PATCH] Propagate... |
1632 |
if (sync) |
7b6d91dae block: unify flag... |
1633 |
rw_flags |= REQ_SYNC; |
7749a8d42 [PATCH] Propagate... |
1634 1635 |
/* |
b8269db45 cfq-iosched: temp... |
1636 1637 |
* Add in META/PRIO flags, if set, before we get to the IO scheduler */ |
1eff9d322 block: rename bio... |
1638 |
rw_flags |= (bio->bi_opf & (REQ_META | REQ_PRIO)); |
b8269db45 cfq-iosched: temp... |
1639 1640 |
/* |
450991bc1 [PATCH] blk: __ma... |
1641 |
* Grab a free request. This is might sleep but can not fail. |
d6344532a [PATCH] blk: redu... |
1642 |
* Returns with the queue unlocked. |
450991bc1 [PATCH] blk: __ma... |
1643 |
*/ |
e6a40b096 block: prepare re... |
1644 |
req = get_request(q, bio_data_dir(bio), rw_flags, bio, GFP_NOIO); |
a492f0754 block,scsi: fixup... |
1645 |
if (IS_ERR(req)) { |
4246a0b63 block: add a bi_e... |
1646 1647 |
bio->bi_error = PTR_ERR(req); bio_endio(bio); |
da8303c63 block: make get_r... |
1648 1649 |
goto out_unlock; } |
d6344532a [PATCH] blk: redu... |
1650 |
|
450991bc1 [PATCH] blk: __ma... |
1651 1652 1653 1654 1655 |
/* * 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. |
1da177e4c Linux-2.6.12-rc2 |
1656 |
*/ |
52d9e6753 [BLOCK] ll_rw_blk... |
1657 |
init_request_from_bio(req, bio); |
1da177e4c Linux-2.6.12-rc2 |
1658 |
|
9562ad9ab block: Remove the... |
1659 |
if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) |
11ccf116d block: fix warnin... |
1660 |
req->cpu = raw_smp_processor_id(); |
73c101011 block: initial pa... |
1661 1662 |
plug = current->plug; |
721a9602e block: kill off R... |
1663 |
if (plug) { |
dc6d36c97 block: readd plug... |
1664 1665 |
/* * If this is the first request added after a plug, fire |
7aef2e780 block: trace all ... |
1666 |
* of a plug trace. |
dc6d36c97 block: readd plug... |
1667 |
*/ |
7aef2e780 block: trace all ... |
1668 |
if (!request_count) |
dc6d36c97 block: readd plug... |
1669 |
trace_block_plug(q); |
3540d5e89 block: avoid unne... |
1670 |
else { |
019ceb7d5 block: add missed... |
1671 |
if (request_count >= BLK_MAX_REQUEST_COUNT) { |
3540d5e89 block: avoid unne... |
1672 |
blk_flush_plug_list(plug, false); |
019ceb7d5 block: add missed... |
1673 1674 |
trace_block_plug(q); } |
73c101011 block: initial pa... |
1675 |
} |
73c101011 block: initial pa... |
1676 |
list_add_tail(&req->queuelist, &plug->list); |
320ae51fe blk-mq: new multi... |
1677 |
blk_account_io_start(req, true); |
73c101011 block: initial pa... |
1678 1679 1680 |
} else { spin_lock_irq(q->queue_lock); add_acct_request(q, req, where); |
24ecfbe27 block: add blk_ru... |
1681 |
__blk_run_queue(q); |
73c101011 block: initial pa... |
1682 1683 1684 |
out_unlock: spin_unlock_irq(q->queue_lock); } |
dece16353 block: change ->m... |
1685 1686 |
return BLK_QC_T_NONE; |
1da177e4c Linux-2.6.12-rc2 |
1687 1688 1689 1690 1691 1692 1693 1694 |
} /* * If bio->bi_dev is a partition, remap the location */ static inline void blk_partition_remap(struct bio *bio) { struct block_device *bdev = bio->bi_bdev; |
bf2de6f5a block: Initial su... |
1695 |
if (bio_sectors(bio) && bdev != bdev->bd_contains) { |
1da177e4c Linux-2.6.12-rc2 |
1696 |
struct hd_struct *p = bdev->bd_part; |
4f024f379 block: Abstract o... |
1697 |
bio->bi_iter.bi_sector += p->start_sect; |
1da177e4c Linux-2.6.12-rc2 |
1698 |
bio->bi_bdev = bdev->bd_contains; |
c7149d6bc Fix remap handlin... |
1699 |
|
d07335e51 block: Rename "bl... |
1700 1701 |
trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), bio, bdev->bd_dev, |
4f024f379 block: Abstract o... |
1702 |
bio->bi_iter.bi_sector - p->start_sect); |
1da177e4c Linux-2.6.12-rc2 |
1703 1704 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1705 1706 1707 1708 1709 1710 |
static void handle_bad_sector(struct bio *bio) { char b[BDEVNAME_SIZE]; printk(KERN_INFO "attempt to access beyond end of device "); |
6296b9604 block, drivers, f... |
1711 1712 |
printk(KERN_INFO "%s: rw=%d, want=%Lu, limit=%Lu ", |
1da177e4c Linux-2.6.12-rc2 |
1713 |
bdevname(bio->bi_bdev, b), |
1eff9d322 block: rename bio... |
1714 |
bio->bi_opf, |
f73a1c7d1 block: Add bio_en... |
1715 |
(unsigned long long)bio_end_sector(bio), |
77304d2ab block: read i_siz... |
1716 |
(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9)); |
1da177e4c Linux-2.6.12-rc2 |
1717 |
} |
c17bb4951 [PATCH] fault-inj... |
1718 1719 1720 1721 1722 1723 1724 1725 1726 |
#ifdef CONFIG_FAIL_MAKE_REQUEST static DECLARE_FAULT_ATTR(fail_make_request); static int __init setup_fail_make_request(char *str) { return setup_fault_attr(&fail_make_request, str); } __setup("fail_make_request=", setup_fail_make_request); |
b2c9cd379 fail_make_request... |
1727 |
static bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
1728 |
{ |
b2c9cd379 fail_make_request... |
1729 |
return part->make_it_fail && should_fail(&fail_make_request, bytes); |
c17bb4951 [PATCH] fault-inj... |
1730 1731 1732 1733 |
} static int __init fail_make_request_debugfs(void) { |
dd48c085c fault-injection: ... |
1734 1735 |
struct dentry *dir = fault_create_debugfs_attr("fail_make_request", NULL, &fail_make_request); |
21f9fcd81 block: replace IS... |
1736 |
return PTR_ERR_OR_ZERO(dir); |
c17bb4951 [PATCH] fault-inj... |
1737 1738 1739 1740 1741 |
} late_initcall(fail_make_request_debugfs); #else /* CONFIG_FAIL_MAKE_REQUEST */ |
b2c9cd379 fail_make_request... |
1742 1743 |
static inline bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
1744 |
{ |
b2c9cd379 fail_make_request... |
1745 |
return false; |
c17bb4951 [PATCH] fault-inj... |
1746 1747 1748 |
} #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
c07e2b412 block: factor our... |
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 |
/* * Check whether this bio extends beyond the end of the device. */ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors) { sector_t maxsector; if (!nr_sectors) return 0; /* Test device or partition size, when known. */ |
77304d2ab block: read i_siz... |
1760 |
maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9; |
c07e2b412 block: factor our... |
1761 |
if (maxsector) { |
4f024f379 block: Abstract o... |
1762 |
sector_t sector = bio->bi_iter.bi_sector; |
c07e2b412 block: factor our... |
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 |
if (maxsector < nr_sectors || maxsector - nr_sectors < sector) { /* * This may well happen - the kernel calls bread() * without checking the size of the device, e.g., when * mounting a device. */ handle_bad_sector(bio); return 1; } } return 0; } |
27a84d54c block: refactor g... |
1777 1778 |
static noinline_for_stack bool generic_make_request_checks(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1779 |
{ |
165125e1e [BLOCK] Get rid o... |
1780 |
struct request_queue *q; |
5a7bbad27 block: remove sup... |
1781 |
int nr_sectors = bio_sectors(bio); |
51fd77bd9 [BLOCK] Don't all... |
1782 |
int err = -EIO; |
5a7bbad27 block: remove sup... |
1783 1784 |
char b[BDEVNAME_SIZE]; struct hd_struct *part; |
1da177e4c Linux-2.6.12-rc2 |
1785 1786 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
1787 |
|
c07e2b412 block: factor our... |
1788 1789 |
if (bio_check_eod(bio, nr_sectors)) goto end_io; |
1da177e4c Linux-2.6.12-rc2 |
1790 |
|
5a7bbad27 block: remove sup... |
1791 1792 1793 1794 1795 1796 1797 |
q = bdev_get_queue(bio->bi_bdev); if (unlikely(!q)) { printk(KERN_ERR "generic_make_request: Trying to access " "nonexistent block-device %s (%Lu) ", bdevname(bio->bi_bdev, b), |
4f024f379 block: Abstract o... |
1798 |
(long long) bio->bi_iter.bi_sector); |
5a7bbad27 block: remove sup... |
1799 1800 |
goto end_io; } |
c17bb4951 [PATCH] fault-inj... |
1801 |
|
5a7bbad27 block: remove sup... |
1802 |
part = bio->bi_bdev->bd_part; |
4f024f379 block: Abstract o... |
1803 |
if (should_fail_request(part, bio->bi_iter.bi_size) || |
5a7bbad27 block: remove sup... |
1804 |
should_fail_request(&part_to_disk(part)->part0, |
4f024f379 block: Abstract o... |
1805 |
bio->bi_iter.bi_size)) |
5a7bbad27 block: remove sup... |
1806 |
goto end_io; |
2056a782f [PATCH] Block que... |
1807 |
|
5a7bbad27 block: remove sup... |
1808 1809 1810 1811 1812 |
/* * If this device has partitions, remap block n * of partition p to block n+start(p) of the disk. */ blk_partition_remap(bio); |
2056a782f [PATCH] Block que... |
1813 |
|
5a7bbad27 block: remove sup... |
1814 1815 |
if (bio_check_eod(bio, nr_sectors)) goto end_io; |
1e87901e1 block: filter flu... |
1816 |
|
5a7bbad27 block: remove sup... |
1817 1818 1819 1820 1821 |
/* * Filter flush bio's early so that make_request based * drivers without flush support don't have to worry * about them. */ |
1eff9d322 block: rename bio... |
1822 |
if ((bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) && |
c888a8f95 block: kill off q... |
1823 |
!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) { |
1eff9d322 block: rename bio... |
1824 |
bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA); |
5a7bbad27 block: remove sup... |
1825 1826 |
if (!nr_sectors) { err = 0; |
51fd77bd9 [BLOCK] Don't all... |
1827 1828 |
goto end_io; } |
5a7bbad27 block: remove sup... |
1829 |
} |
5ddfe9691 [PATCH] md: check... |
1830 |
|
288dab8a3 block: add a sepa... |
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 |
switch (bio_op(bio)) { case REQ_OP_DISCARD: if (!blk_queue_discard(q)) goto not_supported; break; case REQ_OP_SECURE_ERASE: if (!blk_queue_secure_erase(q)) goto not_supported; break; case REQ_OP_WRITE_SAME: if (!bdev_write_same(bio->bi_bdev)) goto not_supported; break; default: break; |
5a7bbad27 block: remove sup... |
1846 |
} |
01edede41 block: trace bio ... |
1847 |
|
7f4b35d15 block: allocate i... |
1848 1849 1850 1851 1852 1853 1854 |
/* * Various block parts want %current->io_context and lazy ioc * allocation ends up trading a lot of pain for a small amount of * memory. Just allocate it upfront. This may fail and block * layer knows how to live with it. */ create_io_context(GFP_ATOMIC, q->node); |
ae1188963 blkcg: consolidat... |
1855 1856 |
if (!blkcg_bio_issue_check(q, bio)) return false; |
27a84d54c block: refactor g... |
1857 |
|
5a7bbad27 block: remove sup... |
1858 |
trace_block_bio_queue(q, bio); |
27a84d54c block: refactor g... |
1859 |
return true; |
a7384677b block: remove dup... |
1860 |
|
288dab8a3 block: add a sepa... |
1861 1862 |
not_supported: err = -EOPNOTSUPP; |
a7384677b block: remove dup... |
1863 |
end_io: |
4246a0b63 block: add a bi_e... |
1864 1865 |
bio->bi_error = err; bio_endio(bio); |
27a84d54c block: refactor g... |
1866 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
1867 |
} |
27a84d54c block: refactor g... |
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 |
/** * generic_make_request - hand a buffer to its device driver for I/O * @bio: The bio describing the location in memory and on the device. * * generic_make_request() is used to make I/O requests of block * devices. It is passed a &struct bio, which describes the I/O that needs * to be done. * * generic_make_request() does not return any status. The * success/failure status of the request, along with notification of * completion, is delivered asynchronously through the bio->bi_end_io * function described (one day) else where. * * The caller of generic_make_request must make sure that bi_io_vec * are set to describe the memory buffer, and that bi_dev and bi_sector are * set to describe the device address, and the * bi_end_io and optionally bi_private are set to describe how * completion notification should be signaled. * * generic_make_request and the drivers it calls may use bi_next if this * bio happens to be merged with someone else, and may resubmit the bio to * a lower device by calling into generic_make_request recursively, which * means the bio should NOT be touched after the call to ->make_request_fn. |
d89d87965 When stacked bloc... |
1891 |
*/ |
dece16353 block: change ->m... |
1892 |
blk_qc_t generic_make_request(struct bio *bio) |
d89d87965 When stacked bloc... |
1893 |
{ |
bddd87c7e blk-core: use BIO... |
1894 |
struct bio_list bio_list_on_stack; |
dece16353 block: change ->m... |
1895 |
blk_qc_t ret = BLK_QC_T_NONE; |
bddd87c7e blk-core: use BIO... |
1896 |
|
27a84d54c block: refactor g... |
1897 |
if (!generic_make_request_checks(bio)) |
dece16353 block: change ->m... |
1898 |
goto out; |
27a84d54c block: refactor g... |
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 |
/* * We only want one ->make_request_fn to be active at a time, else * stack usage with stacked devices could be a problem. So use * current->bio_list to keep a list of requests submited by a * make_request_fn function. current->bio_list is also used as a * flag to say if generic_make_request is currently active in this * task or not. If it is NULL, then no make_request is active. If * it is non-NULL, then a make_request is active, and new requests * should be added at the tail */ |
bddd87c7e blk-core: use BIO... |
1910 |
if (current->bio_list) { |
bddd87c7e blk-core: use BIO... |
1911 |
bio_list_add(current->bio_list, bio); |
dece16353 block: change ->m... |
1912 |
goto out; |
d89d87965 When stacked bloc... |
1913 |
} |
27a84d54c block: refactor g... |
1914 |
|
d89d87965 When stacked bloc... |
1915 1916 1917 1918 1919 |
/* following loop may be a bit non-obvious, and so deserves some * explanation. * Before entering the loop, bio->bi_next is NULL (as all callers * ensure that) so we have a list with a single bio. * We pretend that we have just taken it off a longer list, so |
bddd87c7e blk-core: use BIO... |
1920 1921 |
* we assign bio_list to a pointer to the bio_list_on_stack, * thus initialising the bio_list of new bios to be |
27a84d54c block: refactor g... |
1922 |
* added. ->make_request() may indeed add some more bios |
d89d87965 When stacked bloc... |
1923 1924 1925 |
* through a recursive call to generic_make_request. If it * did, we find a non-NULL value in bio_list and re-enter the loop * from the top. In this case we really did just take the bio |
bddd87c7e blk-core: use BIO... |
1926 |
* of the top of the list (no pretending) and so remove it from |
27a84d54c block: refactor g... |
1927 |
* bio_list, and call into ->make_request() again. |
d89d87965 When stacked bloc... |
1928 1929 |
*/ BUG_ON(bio->bi_next); |
bddd87c7e blk-core: use BIO... |
1930 1931 |
bio_list_init(&bio_list_on_stack); current->bio_list = &bio_list_on_stack; |
d89d87965 When stacked bloc... |
1932 |
do { |
27a84d54c block: refactor g... |
1933 |
struct request_queue *q = bdev_get_queue(bio->bi_bdev); |
6f3b0e8bc blk-mq: add a fla... |
1934 |
if (likely(blk_queue_enter(q, false) == 0)) { |
dece16353 block: change ->m... |
1935 |
ret = q->make_request_fn(q, bio); |
3ef28e83a block: generic re... |
1936 1937 |
blk_queue_exit(q); |
27a84d54c block: refactor g... |
1938 |
|
3ef28e83a block: generic re... |
1939 1940 1941 1942 1943 1944 1945 |
bio = bio_list_pop(current->bio_list); } else { struct bio *bio_next = bio_list_pop(current->bio_list); bio_io_error(bio); bio = bio_next; } |
d89d87965 When stacked bloc... |
1946 |
} while (bio); |
bddd87c7e blk-core: use BIO... |
1947 |
current->bio_list = NULL; /* deactivate */ |
dece16353 block: change ->m... |
1948 1949 1950 |
out: return ret; |
d89d87965 When stacked bloc... |
1951 |
} |
1da177e4c Linux-2.6.12-rc2 |
1952 1953 1954 |
EXPORT_SYMBOL(generic_make_request); /** |
710027a48 Add some block/ s... |
1955 |
* submit_bio - submit a bio to the block device layer for I/O |
1da177e4c Linux-2.6.12-rc2 |
1956 1957 1958 1959 |
* @bio: The &struct bio which describes the I/O * * submit_bio() is very similar in purpose to generic_make_request(), and * uses that function to do most of the work. Both are fairly rough |
710027a48 Add some block/ s... |
1960 |
* interfaces; @bio must be presetup and ready for I/O. |
1da177e4c Linux-2.6.12-rc2 |
1961 1962 |
* */ |
4e49ea4a3 block/fs/drivers:... |
1963 |
blk_qc_t submit_bio(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1964 |
{ |
bf2de6f5a block: Initial su... |
1965 1966 1967 1968 |
/* * If it's a regular read/write or a barrier with data attached, * go through the normal accounting stuff before submission. */ |
e2a60da74 block: Clean up s... |
1969 |
if (bio_has_data(bio)) { |
4363ac7c1 block: Implement ... |
1970 |
unsigned int count; |
95fe6c1a2 block, fs, mm, dr... |
1971 |
if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
4363ac7c1 block: Implement ... |
1972 1973 1974 |
count = bdev_logical_block_size(bio->bi_bdev) >> 9; else count = bio_sectors(bio); |
a8ebb056a block, drivers, c... |
1975 |
if (op_is_write(bio_op(bio))) { |
bf2de6f5a block: Initial su... |
1976 1977 |
count_vm_events(PGPGOUT, count); } else { |
4f024f379 block: Abstract o... |
1978 |
task_io_account_read(bio->bi_iter.bi_size); |
bf2de6f5a block: Initial su... |
1979 1980 1981 1982 1983 |
count_vm_events(PGPGIN, count); } if (unlikely(block_dump)) { char b[BDEVNAME_SIZE]; |
8dcbdc742 block: block_dump... |
1984 1985 |
printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors) ", |
ba25f9dcc Use helpers to ob... |
1986 |
current->comm, task_pid_nr(current), |
a8ebb056a block, drivers, c... |
1987 |
op_is_write(bio_op(bio)) ? "WRITE" : "READ", |
4f024f379 block: Abstract o... |
1988 |
(unsigned long long)bio->bi_iter.bi_sector, |
8dcbdc742 block: block_dump... |
1989 1990 |
bdevname(bio->bi_bdev, b), count); |
bf2de6f5a block: Initial su... |
1991 |
} |
1da177e4c Linux-2.6.12-rc2 |
1992 |
} |
dece16353 block: change ->m... |
1993 |
return generic_make_request(bio); |
1da177e4c Linux-2.6.12-rc2 |
1994 |
} |
1da177e4c Linux-2.6.12-rc2 |
1995 |
EXPORT_SYMBOL(submit_bio); |
3bcddeac1 blk_end_request: ... |
1996 |
/** |
bf4e6b4e7 block: Always che... |
1997 1998 |
* blk_cloned_rq_check_limits - Helper function to check a cloned request * for new the queue limits |
82124d603 block: add reques... |
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 |
* @q: the queue * @rq: the request being checked * * Description: * @rq may have been made based on weaker limitations of upper-level queues * in request stacking drivers, and it may violate the limitation of @q. * Since the block layer and the underlying device driver trust @rq * after it is inserted to @q, it should be checked against @q before * the insertion using this generic function. * |
82124d603 block: add reques... |
2009 |
* Request stacking drivers like request-based dm may change the queue |
bf4e6b4e7 block: Always che... |
2010 2011 |
* limits when retrying requests on other queues. Those requests need * to be checked against the new queue limits again during dispatch. |
82124d603 block: add reques... |
2012 |
*/ |
bf4e6b4e7 block: Always che... |
2013 2014 |
static int blk_cloned_rq_check_limits(struct request_queue *q, struct request *rq) |
82124d603 block: add reques... |
2015 |
{ |
8fe0d473f block: convert me... |
2016 |
if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, req_op(rq))) { |
82124d603 block: add reques... |
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 |
printk(KERN_ERR "%s: over max size limit. ", __func__); return -EIO; } /* * queue's settings related to segment counting like q->bounce_pfn * may differ from that of other stacking queues. * Recalculate it to check the request correctly on this queue's * limitation. */ blk_recalc_rq_segments(rq); |
8a78362c4 block: Consolidat... |
2029 |
if (rq->nr_phys_segments > queue_max_segments(q)) { |
82124d603 block: add reques... |
2030 2031 2032 2033 2034 2035 2036 |
printk(KERN_ERR "%s: over max segments limit. ", __func__); return -EIO; } return 0; } |
82124d603 block: add reques... |
2037 2038 2039 2040 2041 2042 2043 2044 2045 |
/** * blk_insert_cloned_request - Helper for stacking drivers to submit a request * @q: the queue to submit the request * @rq: the request being queued */ int blk_insert_cloned_request(struct request_queue *q, struct request *rq) { unsigned long flags; |
4853abaae block: fix flush ... |
2046 |
int where = ELEVATOR_INSERT_BACK; |
82124d603 block: add reques... |
2047 |
|
bf4e6b4e7 block: Always che... |
2048 |
if (blk_cloned_rq_check_limits(q, rq)) |
82124d603 block: add reques... |
2049 |
return -EIO; |
b2c9cd379 fail_make_request... |
2050 2051 |
if (rq->rq_disk && should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) |
82124d603 block: add reques... |
2052 |
return -EIO; |
82124d603 block: add reques... |
2053 |
|
7fb4898e0 block: add blk-mq... |
2054 2055 2056 |
if (q->mq_ops) { if (blk_queue_io_stat(q)) blk_account_io_start(rq, true); |
6acfe68ba dm: fix excessive... |
2057 |
blk_mq_insert_request(rq, false, true, false); |
7fb4898e0 block: add blk-mq... |
2058 2059 |
return 0; } |
82124d603 block: add reques... |
2060 |
spin_lock_irqsave(q->queue_lock, flags); |
3f3299d5c block: Rename que... |
2061 |
if (unlikely(blk_queue_dying(q))) { |
8ba61435d block: add missin... |
2062 2063 2064 |
spin_unlock_irqrestore(q->queue_lock, flags); return -ENODEV; } |
82124d603 block: add reques... |
2065 2066 2067 2068 2069 2070 |
/* * Submitting request must be dequeued before calling this function * because it will be linked to another request_queue */ BUG_ON(blk_queued_rq(rq)); |
28a8f0d31 block, drivers, f... |
2071 |
if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA)) |
4853abaae block: fix flush ... |
2072 2073 2074 |
where = ELEVATOR_INSERT_FLUSH; add_acct_request(q, rq, where); |
e67b77c79 blk-flush: move t... |
2075 2076 |
if (where == ELEVATOR_INSERT_FLUSH) __blk_run_queue(q); |
82124d603 block: add reques... |
2077 2078 2079 2080 2081 |
spin_unlock_irqrestore(q->queue_lock, flags); return 0; } EXPORT_SYMBOL_GPL(blk_insert_cloned_request); |
80a761fd3 block: implement ... |
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 |
/** * blk_rq_err_bytes - determine number of bytes till the next failure boundary * @rq: request to examine * * Description: * A request could be merge of IOs which require different failure * handling. This function determines the number of bytes which * can be failed from the beginning of the request without * crossing into area which need to be retried further. * * Return: * The number of bytes to fail. * * Context: * queue_lock must be held. */ unsigned int blk_rq_err_bytes(const struct request *rq) { unsigned int ff = rq->cmd_flags & REQ_FAILFAST_MASK; unsigned int bytes = 0; struct bio *bio; if (!(rq->cmd_flags & REQ_MIXED_MERGE)) return blk_rq_bytes(rq); /* * Currently the only 'mixing' which can happen is between * different fastfail types. We can safely fail portions * which have all the failfast bits that the first one has - * the ones which are at least as eager to fail as the first * one. */ for (bio = rq->bio; bio; bio = bio->bi_next) { |
1eff9d322 block: rename bio... |
2115 |
if ((bio->bi_opf & ff) != ff) |
80a761fd3 block: implement ... |
2116 |
break; |
4f024f379 block: Abstract o... |
2117 |
bytes += bio->bi_iter.bi_size; |
80a761fd3 block: implement ... |
2118 2119 2120 2121 2122 2123 2124 |
} /* this could lead to infinite loop */ BUG_ON(blk_rq_bytes(rq) && !bytes); return bytes; } EXPORT_SYMBOL_GPL(blk_rq_err_bytes); |
320ae51fe blk-mq: new multi... |
2125 |
void blk_account_io_completion(struct request *req, unsigned int bytes) |
bc58ba946 block: add sysfs ... |
2126 |
{ |
c2553b584 block: make blk_d... |
2127 |
if (blk_do_io_stat(req)) { |
bc58ba946 block: add sysfs ... |
2128 2129 2130 2131 2132 |
const int rw = rq_data_dir(req); struct hd_struct *part; int cpu; cpu = part_stat_lock(); |
09e099d4b block: fix accoun... |
2133 |
part = req->part; |
bc58ba946 block: add sysfs ... |
2134 2135 2136 2137 |
part_stat_add(cpu, part, sectors[rw], bytes >> 9); part_stat_unlock(); } } |
320ae51fe blk-mq: new multi... |
2138 |
void blk_account_io_done(struct request *req) |
bc58ba946 block: add sysfs ... |
2139 |
{ |
bc58ba946 block: add sysfs ... |
2140 |
/* |
dd4c133f3 block: rename bar... |
2141 2142 2143 |
* Account IO completion. flush_rq isn't accounted as a * normal IO on queueing nor completion. Accounting the * containing request is enough. |
bc58ba946 block: add sysfs ... |
2144 |
*/ |
414b4ff5e block: add REQ_FL... |
2145 |
if (blk_do_io_stat(req) && !(req->cmd_flags & REQ_FLUSH_SEQ)) { |
bc58ba946 block: add sysfs ... |
2146 2147 2148 2149 2150 2151 |
unsigned long duration = jiffies - req->start_time; const int rw = rq_data_dir(req); struct hd_struct *part; int cpu; cpu = part_stat_lock(); |
09e099d4b block: fix accoun... |
2152 |
part = req->part; |
bc58ba946 block: add sysfs ... |
2153 2154 2155 2156 |
part_stat_inc(cpu, part, ios[rw]); part_stat_add(cpu, part, ticks[rw], duration); part_round_stats(cpu, part); |
316d315bf block: Seperate r... |
2157 |
part_dec_in_flight(part, rw); |
bc58ba946 block: add sysfs ... |
2158 |
|
6c23a9681 block: add intern... |
2159 |
hd_struct_put(part); |
bc58ba946 block: add sysfs ... |
2160 2161 2162 |
part_stat_unlock(); } } |
47fafbc70 block / PM: Repla... |
2163 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 |
/* * Don't process normal requests when queue is suspended * or in the process of suspending/resuming */ static struct request *blk_pm_peek_request(struct request_queue *q, struct request *rq) { if (q->dev && (q->rpm_status == RPM_SUSPENDED || (q->rpm_status != RPM_ACTIVE && !(rq->cmd_flags & REQ_PM)))) return NULL; else return rq; } #else static inline struct request *blk_pm_peek_request(struct request_queue *q, struct request *rq) { return rq; } #endif |
320ae51fe blk-mq: new multi... |
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 |
void blk_account_io_start(struct request *rq, bool new_io) { struct hd_struct *part; int rw = rq_data_dir(rq); int cpu; if (!blk_do_io_stat(rq)) return; cpu = part_stat_lock(); if (!new_io) { part = rq->part; part_stat_inc(cpu, part, merges[rw]); } else { part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq)); if (!hd_struct_try_get(part)) { /* * The partition is already being removed, * the request will be accounted on the disk only * * We take a reference on disk->part0 although that * partition will never be deleted, so we can treat * it as any other partition. */ part = &rq->rq_disk->part0; hd_struct_get(part); } part_round_stats(cpu, part); part_inc_in_flight(part, rw); rq->part = part; } part_stat_unlock(); } |
53a08807c block: internal d... |
2219 |
/** |
9934c8c04 block: implement ... |
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 |
* 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. * * Context: * queue_lock must be held. */ struct request *blk_peek_request(struct request_queue *q) |
158dbda00 block: reorganize... |
2236 2237 2238 2239 2240 |
{ struct request *rq; int ret; while ((rq = __elv_next_request(q)) != NULL) { |
c8158819d block: implement ... |
2241 2242 2243 2244 |
rq = blk_pm_peek_request(q, rq); if (!rq) break; |
158dbda00 block: reorganize... |
2245 2246 2247 2248 2249 2250 |
if (!(rq->cmd_flags & REQ_STARTED)) { /* * This is the first time the device driver * sees this request (possibly after * requeueing). Notify IO scheduler. */ |
33659ebba block: remove wra... |
2251 |
if (rq->cmd_flags & REQ_SORTED) |
158dbda00 block: reorganize... |
2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 |
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->cmd_flags |= REQ_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->cmd_flags & REQ_DONTPREP) break; |
2e46e8b27 block: drop reque... |
2270 |
if (q->dma_drain_size && blk_rq_bytes(rq)) { |
158dbda00 block: reorganize... |
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 |
/* * 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. REQ_STARTED will * prevent other fs requests from passing this one. */ |
2e46e8b27 block: drop reque... |
2293 |
if (q->dma_drain_size && blk_rq_bytes(rq) && |
158dbda00 block: reorganize... |
2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 |
!(rq->cmd_flags & REQ_DONTPREP)) { /* * remove the space for the drain we added * so that we don't add it again */ --rq->nr_phys_segments; } rq = NULL; break; |
0fb5b1fb3 block/sd: Return ... |
2304 2305 |
} else if (ret == BLKPREP_KILL || ret == BLKPREP_INVALID) { int err = (ret == BLKPREP_INVALID) ? -EREMOTEIO : -EIO; |
158dbda00 block: reorganize... |
2306 |
rq->cmd_flags |= REQ_QUIET; |
c143dc903 block: fix an oop... |
2307 2308 2309 2310 2311 |
/* * Mark this request as started so we don't trigger * any debug logic in the end I/O path. */ blk_start_request(rq); |
0fb5b1fb3 block/sd: Return ... |
2312 |
__blk_end_request_all(rq, err); |
158dbda00 block: reorganize... |
2313 2314 2315 2316 2317 2318 2319 2320 2321 |
} else { printk(KERN_ERR "%s: bad return=%d ", __func__, ret); break; } } return rq; } |
9934c8c04 block: implement ... |
2322 |
EXPORT_SYMBOL(blk_peek_request); |
158dbda00 block: reorganize... |
2323 |
|
9934c8c04 block: implement ... |
2324 |
void blk_dequeue_request(struct request *rq) |
158dbda00 block: reorganize... |
2325 |
{ |
9934c8c04 block: implement ... |
2326 |
struct request_queue *q = rq->q; |
158dbda00 block: reorganize... |
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 |
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. */ |
9195291e5 blkio: Increment ... |
2337 |
if (blk_account_rq(rq)) { |
0a7ae2ff0 block: change the... |
2338 |
q->in_flight[rq_is_sync(rq)]++; |
9195291e5 blkio: Increment ... |
2339 2340 |
set_io_start_time_ns(rq); } |
158dbda00 block: reorganize... |
2341 |
} |
5efccd17c block: reorder re... |
2342 |
/** |
9934c8c04 block: implement ... |
2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 |
* 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. * * Block internal functions which don't want to start timer should * call blk_dequeue_request(). * * Context: * queue_lock must be held. */ void blk_start_request(struct request *req) { blk_dequeue_request(req); /* |
5f49f6317 block: set rq->re... |
2361 2362 |
* We are now handing the request to the hardware, initialize * resid_len to full count and add the timeout handler. |
9934c8c04 block: implement ... |
2363 |
*/ |
5f49f6317 block: set rq->re... |
2364 |
req->resid_len = blk_rq_bytes(req); |
dbb66c4be block: needs to s... |
2365 2366 |
if (unlikely(blk_bidi_rq(req))) req->next_rq->resid_len = blk_rq_bytes(req->next_rq); |
4912aa6c1 block: fix race b... |
2367 |
BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); |
9934c8c04 block: implement ... |
2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 |
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. * * Context: * queue_lock must be held. */ struct request *blk_fetch_request(struct request_queue *q) { struct request *rq; rq = blk_peek_request(q); if (rq) blk_start_request(rq); return rq; } EXPORT_SYMBOL(blk_fetch_request); /** |
2e60e0229 block: clean up r... |
2399 |
* blk_update_request - Special helper function for request stacking drivers |
8ebf97560 block: fix kernel... |
2400 |
* @req: the request being processed |
710027a48 Add some block/ s... |
2401 |
* @error: %0 for success, < %0 for error |
8ebf97560 block: fix kernel... |
2402 |
* @nr_bytes: number of bytes to complete @req |
3bcddeac1 blk_end_request: ... |
2403 2404 |
* * Description: |
8ebf97560 block: fix kernel... |
2405 2406 2407 |
* Ends I/O on a number of bytes attached to @req, but doesn't complete * the request structure even if @req doesn't have leftover. * If @req has leftover, sets it up for the next range of segments. |
2e60e0229 block: clean up r... |
2408 2409 2410 2411 2412 2413 2414 |
* * This special helper function is only for request stacking drivers * (e.g. request-based dm) so that they can handle partial completion. * Actual device drivers should use blk_end_request instead. * * Passing the result of blk_rq_bytes() as @nr_bytes guarantees * %false return from this function. |
3bcddeac1 blk_end_request: ... |
2415 2416 |
* * Return: |
2e60e0229 block: clean up r... |
2417 2418 |
* %false - this request doesn't have any more data * %true - this request has more data |
3bcddeac1 blk_end_request: ... |
2419 |
**/ |
2e60e0229 block: clean up r... |
2420 |
bool blk_update_request(struct request *req, int error, unsigned int nr_bytes) |
1da177e4c Linux-2.6.12-rc2 |
2421 |
{ |
f79ea4161 block: Refactor b... |
2422 |
int total_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2423 |
|
4a0efdc93 block: misplaced ... |
2424 |
trace_block_rq_complete(req->q, req, nr_bytes); |
2e60e0229 block: clean up r... |
2425 2426 |
if (!req->bio) return false; |
1da177e4c Linux-2.6.12-rc2 |
2427 |
/* |
6f41469c6 block: clear req-... |
2428 2429 2430 2431 2432 2433 |
* For fs requests, rq is just carrier of independent bio's * and each partial completion should be handled separately. * Reset per-request error on each partial completion. * * TODO: tj: This is too subtle. It would be better to let * low level drivers do what they see fit. |
1da177e4c Linux-2.6.12-rc2 |
2434 |
*/ |
33659ebba block: remove wra... |
2435 |
if (req->cmd_type == REQ_TYPE_FS) |
1da177e4c Linux-2.6.12-rc2 |
2436 |
req->errors = 0; |
33659ebba block: remove wra... |
2437 2438 |
if (error && req->cmd_type == REQ_TYPE_FS && !(req->cmd_flags & REQ_QUIET)) { |
79775567e [SCSI] block: imp... |
2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 |
char *error_type; switch (error) { case -ENOLINK: error_type = "recoverable transport"; break; case -EREMOTEIO: error_type = "critical target"; break; case -EBADE: error_type = "critical nexus"; break; |
d1ffc1f86 block/dasd: detai... |
2451 2452 2453 |
case -ETIMEDOUT: error_type = "timeout"; break; |
a9d6ceb83 [SCSI] return ENO... |
2454 2455 2456 |
case -ENOSPC: error_type = "critical space allocation"; break; |
7e782af57 [SCSI] Return ENO... |
2457 2458 2459 |
case -ENODATA: error_type = "critical medium"; break; |
79775567e [SCSI] block: imp... |
2460 2461 2462 2463 2464 |
case -EIO: default: error_type = "I/O"; break; } |
ef3ecb66b block: make blk_u... |
2465 2466 2467 |
printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu ", __func__, error_type, req->rq_disk ? |
37d7b34f0 block: rate-limit... |
2468 2469 |
req->rq_disk->disk_name : "?", (unsigned long long)blk_rq_pos(req)); |
1da177e4c Linux-2.6.12-rc2 |
2470 |
} |
bc58ba946 block: add sysfs ... |
2471 |
blk_account_io_completion(req, nr_bytes); |
d72d904a5 [BLOCK] Update re... |
2472 |
|
f79ea4161 block: Refactor b... |
2473 2474 2475 |
total_bytes = 0; while (req->bio) { struct bio *bio = req->bio; |
4f024f379 block: Abstract o... |
2476 |
unsigned bio_bytes = min(bio->bi_iter.bi_size, nr_bytes); |
1da177e4c Linux-2.6.12-rc2 |
2477 |
|
4f024f379 block: Abstract o... |
2478 |
if (bio_bytes == bio->bi_iter.bi_size) |
1da177e4c Linux-2.6.12-rc2 |
2479 |
req->bio = bio->bi_next; |
1da177e4c Linux-2.6.12-rc2 |
2480 |
|
f79ea4161 block: Refactor b... |
2481 |
req_bio_endio(req, bio, bio_bytes, error); |
1da177e4c Linux-2.6.12-rc2 |
2482 |
|
f79ea4161 block: Refactor b... |
2483 2484 |
total_bytes += bio_bytes; nr_bytes -= bio_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2485 |
|
f79ea4161 block: Refactor b... |
2486 2487 |
if (!nr_bytes) break; |
1da177e4c Linux-2.6.12-rc2 |
2488 2489 2490 2491 2492 |
} /* * completely done */ |
2e60e0229 block: clean up r... |
2493 2494 2495 2496 2497 2498 |
if (!req->bio) { /* * Reset counters so that the request stacking driver * can find how many bytes remain in the request * later. */ |
a2dec7b36 block: hide reque... |
2499 |
req->__data_len = 0; |
2e60e0229 block: clean up r... |
2500 2501 |
return false; } |
1da177e4c Linux-2.6.12-rc2 |
2502 |
|
a2dec7b36 block: hide reque... |
2503 |
req->__data_len -= total_bytes; |
2e46e8b27 block: drop reque... |
2504 2505 |
/* update sector only for requests with clear definition of sector */ |
e2a60da74 block: Clean up s... |
2506 |
if (req->cmd_type == REQ_TYPE_FS) |
a2dec7b36 block: hide reque... |
2507 |
req->__sector += total_bytes >> 9; |
2e46e8b27 block: drop reque... |
2508 |
|
80a761fd3 block: implement ... |
2509 2510 2511 |
/* mixed attributes always follow the first bio */ if (req->cmd_flags & REQ_MIXED_MERGE) { req->cmd_flags &= ~REQ_FAILFAST_MASK; |
1eff9d322 block: rename bio... |
2512 |
req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK; |
80a761fd3 block: implement ... |
2513 |
} |
2e46e8b27 block: drop reque... |
2514 2515 2516 2517 2518 |
/* * If total number of sectors is less than the first segment * size, something has gone terribly wrong. */ if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) { |
8182924bc block: dump reque... |
2519 |
blk_dump_rq_flags(req, "request botched"); |
a2dec7b36 block: hide reque... |
2520 |
req->__data_len = blk_rq_cur_bytes(req); |
2e46e8b27 block: drop reque... |
2521 2522 2523 |
} /* recalculate the number of segments */ |
1da177e4c Linux-2.6.12-rc2 |
2524 |
blk_recalc_rq_segments(req); |
2e46e8b27 block: drop reque... |
2525 |
|
2e60e0229 block: clean up r... |
2526 |
return true; |
1da177e4c Linux-2.6.12-rc2 |
2527 |
} |
2e60e0229 block: clean up r... |
2528 |
EXPORT_SYMBOL_GPL(blk_update_request); |
1da177e4c Linux-2.6.12-rc2 |
2529 |
|
2e60e0229 block: clean up r... |
2530 2531 2532 |
static bool blk_update_bidi_request(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes) |
5efccd17c block: reorder re... |
2533 |
{ |
2e60e0229 block: clean up r... |
2534 2535 |
if (blk_update_request(rq, error, nr_bytes)) return true; |
5efccd17c block: reorder re... |
2536 |
|
2e60e0229 block: clean up r... |
2537 2538 2539 2540 |
/* 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; |
5efccd17c block: reorder re... |
2541 |
|
e2e1a148b block: add sysfs ... |
2542 2543 |
if (blk_queue_add_random(rq->q)) add_disk_randomness(rq->rq_disk); |
2e60e0229 block: clean up r... |
2544 2545 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
2546 |
} |
28018c242 block: implement ... |
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 |
/** * 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->cmd_flags &= ~REQ_DONTPREP; if (q->unprep_rq_fn) q->unprep_rq_fn(q, req); } EXPORT_SYMBOL_GPL(blk_unprep_request); |
1da177e4c Linux-2.6.12-rc2 |
2566 2567 2568 |
/* * queue lock must be held */ |
12120077b block: export blk... |
2569 |
void blk_finish_request(struct request *req, int error) |
1da177e4c Linux-2.6.12-rc2 |
2570 |
{ |
125c99bc8 scsi: add new scs... |
2571 |
if (req->cmd_flags & REQ_QUEUED) |
b8286239d blk_end_request: ... |
2572 |
blk_queue_end_tag(req->q, req); |
ba396a6c1 block: fix oops w... |
2573 |
BUG_ON(blk_queued_rq(req)); |
1da177e4c Linux-2.6.12-rc2 |
2574 |
|
33659ebba block: remove wra... |
2575 |
if (unlikely(laptop_mode) && req->cmd_type == REQ_TYPE_FS) |
31373d09d laptop-mode: Make... |
2576 |
laptop_io_completion(&req->q->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
2577 |
|
e78042e5b blk: move blk_del... |
2578 |
blk_delete_timer(req); |
28018c242 block: implement ... |
2579 2580 |
if (req->cmd_flags & REQ_DONTPREP) blk_unprep_request(req); |
bc58ba946 block: add sysfs ... |
2581 |
blk_account_io_done(req); |
b8286239d blk_end_request: ... |
2582 |
|
1da177e4c Linux-2.6.12-rc2 |
2583 |
if (req->end_io) |
8ffdc6550 [BLOCK] add @upto... |
2584 |
req->end_io(req, error); |
b8286239d blk_end_request: ... |
2585 2586 2587 |
else { if (blk_bidi_rq(req)) __blk_put_request(req->next_rq->q, req->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
2588 |
__blk_put_request(req->q, req); |
b8286239d blk_end_request: ... |
2589 |
} |
1da177e4c Linux-2.6.12-rc2 |
2590 |
} |
12120077b block: export blk... |
2591 |
EXPORT_SYMBOL(blk_finish_request); |
1da177e4c Linux-2.6.12-rc2 |
2592 |
|
3b11313a6 blk_end_request: ... |
2593 |
/** |
2e60e0229 block: clean up r... |
2594 2595 2596 2597 2598 |
* blk_end_bidi_request - Complete a bidi request * @rq: the request to complete * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
a0cd12854 block: add end_qu... |
2599 2600 |
* * Description: |
e3a04fe34 blk_end_request: ... |
2601 |
* Ends I/O on a number of bytes attached to @rq and @rq->next_rq. |
2e60e0229 block: clean up r... |
2602 2603 2604 |
* 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. |
336cdb400 blk_end_request: ... |
2605 2606 |
* * Return: |
2e60e0229 block: clean up r... |
2607 2608 |
* %false - we are done with this request * %true - still buffers pending for this request |
a0cd12854 block: add end_qu... |
2609 |
**/ |
b1f744937 block: move compl... |
2610 |
static bool blk_end_bidi_request(struct request *rq, int error, |
32fab448e block: add reques... |
2611 2612 |
unsigned int nr_bytes, unsigned int bidi_bytes) { |
336cdb400 blk_end_request: ... |
2613 |
struct request_queue *q = rq->q; |
2e60e0229 block: clean up r... |
2614 |
unsigned long flags; |
32fab448e block: add reques... |
2615 |
|
2e60e0229 block: clean up r... |
2616 2617 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
32fab448e block: add reques... |
2618 |
|
336cdb400 blk_end_request: ... |
2619 |
spin_lock_irqsave(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
2620 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
2621 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
2622 |
return false; |
32fab448e block: add reques... |
2623 |
} |
336cdb400 blk_end_request: ... |
2624 |
/** |
2e60e0229 block: clean up r... |
2625 2626 |
* __blk_end_bidi_request - Complete a bidi request with queue lock held * @rq: the request to complete |
710027a48 Add some block/ s... |
2627 |
* @error: %0 for success, < %0 for error |
e3a04fe34 blk_end_request: ... |
2628 2629 |
* @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
336cdb400 blk_end_request: ... |
2630 2631 |
* * Description: |
2e60e0229 block: clean up r... |
2632 2633 |
* Identical to blk_end_bidi_request() except that queue lock is * assumed to be locked on entry and remains so on return. |
336cdb400 blk_end_request: ... |
2634 2635 |
* * Return: |
2e60e0229 block: clean up r... |
2636 2637 |
* %false - we are done with this request * %true - still buffers pending for this request |
336cdb400 blk_end_request: ... |
2638 |
**/ |
4853abaae block: fix flush ... |
2639 |
bool __blk_end_bidi_request(struct request *rq, int error, |
b1f744937 block: move compl... |
2640 |
unsigned int nr_bytes, unsigned int bidi_bytes) |
336cdb400 blk_end_request: ... |
2641 |
{ |
2e60e0229 block: clean up r... |
2642 2643 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
336cdb400 blk_end_request: ... |
2644 |
|
2e60e0229 block: clean up r... |
2645 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
2646 |
|
2e60e0229 block: clean up r... |
2647 |
return false; |
336cdb400 blk_end_request: ... |
2648 |
} |
e19a3ab05 blk_end_request: ... |
2649 2650 2651 2652 |
/** * blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed |
710027a48 Add some block/ s... |
2653 |
* @error: %0 for success, < %0 for error |
e19a3ab05 blk_end_request: ... |
2654 2655 2656 2657 2658 2659 2660 |
* @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: |
b1f744937 block: move compl... |
2661 2662 |
* %false - we are done with this request * %true - still buffers pending for this request |
e19a3ab05 blk_end_request: ... |
2663 |
**/ |
b1f744937 block: move compl... |
2664 |
bool blk_end_request(struct request *rq, int error, unsigned int nr_bytes) |
e19a3ab05 blk_end_request: ... |
2665 |
{ |
b1f744937 block: move compl... |
2666 |
return blk_end_bidi_request(rq, error, nr_bytes, 0); |
e19a3ab05 blk_end_request: ... |
2667 |
} |
56ad1740d block: make the e... |
2668 |
EXPORT_SYMBOL(blk_end_request); |
336cdb400 blk_end_request: ... |
2669 2670 |
/** |
b1f744937 block: move compl... |
2671 2672 |
* blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
8ebf97560 block: fix kernel... |
2673 |
* @error: %0 for success, < %0 for error |
336cdb400 blk_end_request: ... |
2674 2675 |
* * Description: |
b1f744937 block: move compl... |
2676 2677 2678 |
* Completely finish @rq. */ void blk_end_request_all(struct request *rq, int error) |
336cdb400 blk_end_request: ... |
2679 |
{ |
b1f744937 block: move compl... |
2680 2681 |
bool pending; unsigned int bidi_bytes = 0; |
336cdb400 blk_end_request: ... |
2682 |
|
b1f744937 block: move compl... |
2683 2684 |
if (unlikely(blk_bidi_rq(rq))) bidi_bytes = blk_rq_bytes(rq->next_rq); |
336cdb400 blk_end_request: ... |
2685 |
|
b1f744937 block: move compl... |
2686 2687 2688 |
pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); BUG_ON(pending); } |
56ad1740d block: make the e... |
2689 |
EXPORT_SYMBOL(blk_end_request_all); |
336cdb400 blk_end_request: ... |
2690 |
|
b1f744937 block: move compl... |
2691 2692 2693 |
/** * blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for |
8ebf97560 block: fix kernel... |
2694 |
* @error: %0 for success, < %0 for error |
b1f744937 block: move compl... |
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 |
* * Description: * Complete the current consecutively mapped chunk from @rq. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */ bool blk_end_request_cur(struct request *rq, int error) { return blk_end_request(rq, error, blk_rq_cur_bytes(rq)); |
336cdb400 blk_end_request: ... |
2706 |
} |
56ad1740d block: make the e... |
2707 |
EXPORT_SYMBOL(blk_end_request_cur); |
336cdb400 blk_end_request: ... |
2708 |
|
e19a3ab05 blk_end_request: ... |
2709 |
/** |
80a761fd3 block: implement ... |
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 |
* blk_end_request_err - Finish a request till the next failure boundary. * @rq: the request to finish till the next failure boundary for * @error: must be negative errno * * Description: * Complete @rq till the next failure boundary. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */ bool blk_end_request_err(struct request *rq, int error) { WARN_ON(error >= 0); return blk_end_request(rq, error, blk_rq_err_bytes(rq)); } EXPORT_SYMBOL_GPL(blk_end_request_err); /** |
b1f744937 block: move compl... |
2729 2730 2731 2732 |
* __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete |
e3a04fe34 blk_end_request: ... |
2733 2734 |
* * Description: |
b1f744937 block: move compl... |
2735 |
* Must be called with queue lock held unlike blk_end_request(). |
e3a04fe34 blk_end_request: ... |
2736 2737 |
* * Return: |
b1f744937 block: move compl... |
2738 2739 |
* %false - we are done with this request * %true - still buffers pending for this request |
e3a04fe34 blk_end_request: ... |
2740 |
**/ |
b1f744937 block: move compl... |
2741 |
bool __blk_end_request(struct request *rq, int error, unsigned int nr_bytes) |
e3a04fe34 blk_end_request: ... |
2742 |
{ |
b1f744937 block: move compl... |
2743 |
return __blk_end_bidi_request(rq, error, nr_bytes, 0); |
e3a04fe34 blk_end_request: ... |
2744 |
} |
56ad1740d block: make the e... |
2745 |
EXPORT_SYMBOL(__blk_end_request); |
e3a04fe34 blk_end_request: ... |
2746 2747 |
/** |
b1f744937 block: move compl... |
2748 2749 |
* __blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
8ebf97560 block: fix kernel... |
2750 |
* @error: %0 for success, < %0 for error |
32fab448e block: add reques... |
2751 2752 |
* * Description: |
b1f744937 block: move compl... |
2753 |
* Completely finish @rq. Must be called with queue lock held. |
32fab448e block: add reques... |
2754 |
*/ |
b1f744937 block: move compl... |
2755 |
void __blk_end_request_all(struct request *rq, int error) |
32fab448e block: add reques... |
2756 |
{ |
b1f744937 block: move compl... |
2757 2758 2759 2760 2761 2762 2763 2764 |
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); |
32fab448e block: add reques... |
2765 |
} |
56ad1740d block: make the e... |
2766 |
EXPORT_SYMBOL(__blk_end_request_all); |
32fab448e block: add reques... |
2767 2768 |
/** |
b1f744937 block: move compl... |
2769 2770 |
* __blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for |
8ebf97560 block: fix kernel... |
2771 |
* @error: %0 for success, < %0 for error |
e19a3ab05 blk_end_request: ... |
2772 2773 |
* * Description: |
b1f744937 block: move compl... |
2774 2775 |
* Complete the current consecutively mapped chunk from @rq. Must * be called with queue lock held. |
e19a3ab05 blk_end_request: ... |
2776 2777 |
* * Return: |
b1f744937 block: move compl... |
2778 2779 2780 2781 |
* %false - we are done with this request * %true - still buffers pending for this request */ bool __blk_end_request_cur(struct request *rq, int error) |
e19a3ab05 blk_end_request: ... |
2782 |
{ |
b1f744937 block: move compl... |
2783 |
return __blk_end_request(rq, error, blk_rq_cur_bytes(rq)); |
e19a3ab05 blk_end_request: ... |
2784 |
} |
56ad1740d block: make the e... |
2785 |
EXPORT_SYMBOL(__blk_end_request_cur); |
e19a3ab05 blk_end_request: ... |
2786 |
|
80a761fd3 block: implement ... |
2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 |
/** * __blk_end_request_err - Finish a request till the next failure boundary. * @rq: the request to finish till the next failure boundary for * @error: must be negative errno * * Description: * Complete @rq till the next failure boundary. 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_err(struct request *rq, int error) { WARN_ON(error >= 0); return __blk_end_request(rq, error, blk_rq_err_bytes(rq)); } EXPORT_SYMBOL_GPL(__blk_end_request_err); |
86db1e297 block: continue l... |
2806 2807 |
void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2808 |
{ |
4993b77d3 block: copy bio o... |
2809 |
req_set_op(rq, bio_op(bio)); |
1da177e4c Linux-2.6.12-rc2 |
2810 |
|
b4f42e283 block: remove str... |
2811 |
if (bio_has_data(bio)) |
fb2dce862 Add 'discard' req... |
2812 |
rq->nr_phys_segments = bio_phys_segments(q, bio); |
b4f42e283 block: remove str... |
2813 |
|
4f024f379 block: Abstract o... |
2814 |
rq->__data_len = bio->bi_iter.bi_size; |
1da177e4c Linux-2.6.12-rc2 |
2815 |
rq->bio = rq->biotail = bio; |
1da177e4c Linux-2.6.12-rc2 |
2816 |
|
66846572b Stop exporting bl... |
2817 2818 2819 |
if (bio->bi_bdev) rq->rq_disk = bio->bi_bdev->bd_disk; } |
1da177e4c Linux-2.6.12-rc2 |
2820 |
|
2d4dc890b block: add helper... |
2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 |
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE /** * rq_flush_dcache_pages - Helper function to flush all pages in a request * @rq: the request to be flushed * * Description: * Flush all pages in @rq. */ void rq_flush_dcache_pages(struct request *rq) { struct req_iterator iter; |
7988613b0 block: Convert bi... |
2832 |
struct bio_vec bvec; |
2d4dc890b block: add helper... |
2833 2834 |
rq_for_each_segment(bvec, rq, iter) |
7988613b0 block: Convert bi... |
2835 |
flush_dcache_page(bvec.bv_page); |
2d4dc890b block: add helper... |
2836 2837 2838 |
} EXPORT_SYMBOL_GPL(rq_flush_dcache_pages); #endif |
ef9e3facd block: add lld bu... |
2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 |
/** * blk_lld_busy - Check if underlying low-level drivers of a device are busy * @q : the queue of the device being checked * * Description: * Check if underlying low-level drivers of a device are busy. * If the drivers want to export their busy state, they must set own * exporting function using blk_queue_lld_busy() first. * * Basically, this function is used only by request stacking drivers * to stop dispatching requests to underlying devices when underlying * devices are busy. This behavior helps more I/O merging on the queue * of the request stacking driver and prevents I/O throughput regression * on burst I/O load. * * Return: * 0 - Not busy (The request stacking driver should dispatch request) * 1 - Busy (The request stacking driver should stop dispatching request) */ int blk_lld_busy(struct request_queue *q) { if (q->lld_busy_fn) return q->lld_busy_fn(q); return 0; } EXPORT_SYMBOL_GPL(blk_lld_busy); |
78d8e58a0 Revert "block, dm... |
2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 |
/** * blk_rq_unprep_clone - Helper function to free all bios in a cloned request * @rq: the clone request to be cleaned up * * Description: * Free all bios in @rq for a cloned request. */ void blk_rq_unprep_clone(struct request *rq) { struct bio *bio; while ((bio = rq->bio) != NULL) { rq->bio = bio->bi_next; bio_put(bio); } } EXPORT_SYMBOL_GPL(blk_rq_unprep_clone); /* * Copy attributes of the original request to the clone request. * The actual data parts (e.g. ->cmd, ->sense) are not copied. */ static void __blk_rq_prep_clone(struct request *dst, struct request *src) |
b0fd271d5 block: add reques... |
2890 2891 |
{ dst->cpu = src->cpu; |
4993b77d3 block: copy bio o... |
2892 2893 |
req_set_op_attrs(dst, req_op(src), (src->cmd_flags & REQ_CLONE_MASK) | REQ_NOMERGE); |
b0fd271d5 block: add reques... |
2894 2895 2896 2897 2898 2899 |
dst->cmd_type = src->cmd_type; dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); dst->nr_phys_segments = src->nr_phys_segments; dst->ioprio = src->ioprio; dst->extra_len = src->extra_len; |
78d8e58a0 Revert "block, dm... |
2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 |
} /** * blk_rq_prep_clone - Helper function to setup clone request * @rq: the request to be setup * @rq_src: original request to be cloned * @bs: bio_set that bios for clone are allocated from * @gfp_mask: memory allocation mask for bio * @bio_ctr: setup function to be called for each clone bio. * Returns %0 for success, non %0 for failure. * @data: private data to be passed to @bio_ctr * * Description: * Clones bios in @rq_src to @rq, and copies attributes of @rq_src to @rq. * The actual data parts of @rq_src (e.g. ->cmd, ->sense) * are not copied, and copying such parts is the caller's responsibility. * Also, pages which the original bios are pointing to are not copied * and the cloned bios just point same pages. * So cloned bios must be completed before original bios, which means * the caller must complete @rq before @rq_src. */ int blk_rq_prep_clone(struct request *rq, struct request *rq_src, struct bio_set *bs, gfp_t gfp_mask, int (*bio_ctr)(struct bio *, struct bio *, void *), void *data) { struct bio *bio, *bio_src; if (!bs) bs = fs_bio_set; __rq_for_each_bio(bio_src, rq_src) { bio = bio_clone_fast(bio_src, gfp_mask, bs); if (!bio) goto free_and_out; if (bio_ctr && bio_ctr(bio, bio_src, data)) goto free_and_out; if (rq->bio) { rq->biotail->bi_next = bio; rq->biotail = bio; } else rq->bio = rq->biotail = bio; } __blk_rq_prep_clone(rq, rq_src); return 0; free_and_out: if (bio) bio_put(bio); blk_rq_unprep_clone(rq); return -ENOMEM; |
b0fd271d5 block: add reques... |
2956 2957 |
} EXPORT_SYMBOL_GPL(blk_rq_prep_clone); |
59c3d45e4 block: remove 'q'... |
2958 |
int kblockd_schedule_work(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
2959 2960 2961 |
{ return queue_work(kblockd_workqueue, work); } |
1da177e4c Linux-2.6.12-rc2 |
2962 |
EXPORT_SYMBOL(kblockd_schedule_work); |
59c3d45e4 block: remove 'q'... |
2963 2964 |
int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay) |
e43473b7f blkio: Core imple... |
2965 2966 2967 2968 |
{ return queue_delayed_work(kblockd_workqueue, dwork, delay); } EXPORT_SYMBOL(kblockd_schedule_delayed_work); |
8ab14595b block: add kblock... |
2969 2970 2971 2972 2973 2974 |
int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay) { return queue_delayed_work_on(cpu, kblockd_workqueue, dwork, delay); } EXPORT_SYMBOL(kblockd_schedule_delayed_work_on); |
75df71362 block: document b... |
2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 |
/** * blk_start_plug - initialize blk_plug and track it inside the task_struct * @plug: The &struct blk_plug that needs to be initialized * * Description: * Tracking blk_plug inside the task_struct will help with auto-flushing the * pending I/O should the task end up blocking between blk_start_plug() and * blk_finish_plug(). This is important from a performance perspective, but * also ensures that we don't deadlock. For instance, if the task is blocking * for a memory allocation, memory reclaim could end up wanting to free a * page belonging to that request that is currently residing in our private * plug. By flushing the pending I/O when the process goes to sleep, we avoid * this kind of deadlock. */ |
73c101011 block: initial pa... |
2989 2990 2991 |
void blk_start_plug(struct blk_plug *plug) { struct task_struct *tsk = current; |
dd6cf3e18 blk: clean up plug |
2992 2993 2994 2995 2996 |
/* * If this is a nested plug, don't actually assign it. */ if (tsk->plug) return; |
73c101011 block: initial pa... |
2997 |
INIT_LIST_HEAD(&plug->list); |
320ae51fe blk-mq: new multi... |
2998 |
INIT_LIST_HEAD(&plug->mq_list); |
048c9374a block: Enhance ne... |
2999 |
INIT_LIST_HEAD(&plug->cb_list); |
73c101011 block: initial pa... |
3000 |
/* |
dd6cf3e18 blk: clean up plug |
3001 3002 |
* Store ordering should not be needed here, since a potential * preempt will imply a full memory barrier |
73c101011 block: initial pa... |
3003 |
*/ |
dd6cf3e18 blk: clean up plug |
3004 |
tsk->plug = plug; |
73c101011 block: initial pa... |
3005 3006 3007 3008 3009 3010 3011 |
} 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); |
975927b94 block: Add blk_rq... |
3012 3013 |
return !(rqa->q < rqb->q || (rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb))); |
73c101011 block: initial pa... |
3014 |
} |
49cac01e1 block: make unplu... |
3015 3016 3017 3018 3019 3020 |
/* * 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. */ |
f6603783f block: only force... |
3021 |
static void queue_unplugged(struct request_queue *q, unsigned int depth, |
49cac01e1 block: make unplu... |
3022 |
bool from_schedule) |
99e22598e block: drop queue... |
3023 |
__releases(q->queue_lock) |
94b5eb28b block: fixup bloc... |
3024 |
{ |
49cac01e1 block: make unplu... |
3025 |
trace_block_unplug(q, depth, !from_schedule); |
99e22598e block: drop queue... |
3026 |
|
704605711 block: Avoid sche... |
3027 |
if (from_schedule) |
24ecfbe27 block: add blk_ru... |
3028 |
blk_run_queue_async(q); |
704605711 block: Avoid sche... |
3029 |
else |
24ecfbe27 block: add blk_ru... |
3030 |
__blk_run_queue(q); |
704605711 block: Avoid sche... |
3031 |
spin_unlock(q->queue_lock); |
94b5eb28b block: fixup bloc... |
3032 |
} |
74018dc30 blk: pass from_sc... |
3033 |
static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) |
048c9374a block: Enhance ne... |
3034 3035 |
{ LIST_HEAD(callbacks); |
2a7d5559b block: stack unplug |
3036 3037 |
while (!list_empty(&plug->cb_list)) { list_splice_init(&plug->cb_list, &callbacks); |
048c9374a block: Enhance ne... |
3038 |
|
2a7d5559b block: stack unplug |
3039 3040 |
while (!list_empty(&callbacks)) { struct blk_plug_cb *cb = list_first_entry(&callbacks, |
048c9374a block: Enhance ne... |
3041 3042 |
struct blk_plug_cb, list); |
2a7d5559b block: stack unplug |
3043 |
list_del(&cb->list); |
74018dc30 blk: pass from_sc... |
3044 |
cb->callback(cb, from_schedule); |
2a7d5559b block: stack unplug |
3045 |
} |
048c9374a block: Enhance ne... |
3046 3047 |
} } |
9cbb17508 blk: centralize n... |
3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 |
struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, void *data, int size) { struct blk_plug *plug = current->plug; struct blk_plug_cb *cb; if (!plug) return NULL; list_for_each_entry(cb, &plug->cb_list, list) if (cb->callback == unplug && cb->data == data) return cb; /* Not currently on the callback list */ BUG_ON(size < sizeof(*cb)); cb = kzalloc(size, GFP_ATOMIC); if (cb) { cb->data = data; cb->callback = unplug; list_add(&cb->list, &plug->cb_list); } return cb; } EXPORT_SYMBOL(blk_check_plugged); |
49cac01e1 block: make unplu... |
3072 |
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) |
73c101011 block: initial pa... |
3073 3074 3075 3076 |
{ struct request_queue *q; unsigned long flags; struct request *rq; |
109b81296 block: splice plu... |
3077 |
LIST_HEAD(list); |
94b5eb28b block: fixup bloc... |
3078 |
unsigned int depth; |
73c101011 block: initial pa... |
3079 |
|
74018dc30 blk: pass from_sc... |
3080 |
flush_plug_callbacks(plug, from_schedule); |
320ae51fe blk-mq: new multi... |
3081 3082 3083 |
if (!list_empty(&plug->mq_list)) blk_mq_flush_plug_list(plug, from_schedule); |
73c101011 block: initial pa... |
3084 3085 |
if (list_empty(&plug->list)) return; |
109b81296 block: splice plu... |
3086 |
list_splice_init(&plug->list, &list); |
422765c26 block: Remove sho... |
3087 |
list_sort(NULL, &list, plug_rq_cmp); |
73c101011 block: initial pa... |
3088 3089 |
q = NULL; |
94b5eb28b block: fixup bloc... |
3090 |
depth = 0; |
188112722 block: add commen... |
3091 3092 3093 3094 3095 |
/* * Save and disable interrupts here, to avoid doing it for every * queue lock we have to take. */ |
73c101011 block: initial pa... |
3096 |
local_irq_save(flags); |
109b81296 block: splice plu... |
3097 3098 |
while (!list_empty(&list)) { rq = list_entry_rq(list.next); |
73c101011 block: initial pa... |
3099 |
list_del_init(&rq->queuelist); |
73c101011 block: initial pa... |
3100 3101 |
BUG_ON(!rq->q); if (rq->q != q) { |
99e22598e block: drop queue... |
3102 3103 3104 3105 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3106 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3107 |
q = rq->q; |
94b5eb28b block: fixup bloc... |
3108 |
depth = 0; |
73c101011 block: initial pa... |
3109 3110 |
spin_lock(q->queue_lock); } |
8ba61435d block: add missin... |
3111 3112 3113 3114 |
/* * Short-circuit if @q is dead */ |
3f3299d5c block: Rename que... |
3115 |
if (unlikely(blk_queue_dying(q))) { |
8ba61435d block: add missin... |
3116 3117 3118 |
__blk_end_request_all(rq, -ENODEV); continue; } |
73c101011 block: initial pa... |
3119 3120 3121 |
/* * rq is already accounted, so use raw insert */ |
28a8f0d31 block, drivers, f... |
3122 |
if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA)) |
401a18e92 block: fix bug wi... |
3123 3124 3125 |
__elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH); else __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE); |
94b5eb28b block: fixup bloc... |
3126 3127 |
depth++; |
73c101011 block: initial pa... |
3128 |
} |
99e22598e block: drop queue... |
3129 3130 3131 3132 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3133 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3134 |
|
73c101011 block: initial pa... |
3135 3136 |
local_irq_restore(flags); } |
73c101011 block: initial pa... |
3137 3138 3139 |
void blk_finish_plug(struct blk_plug *plug) { |
dd6cf3e18 blk: clean up plug |
3140 3141 |
if (plug != current->plug) return; |
f6603783f block: only force... |
3142 |
blk_flush_plug_list(plug, false); |
73c101011 block: initial pa... |
3143 |
|
dd6cf3e18 blk: clean up plug |
3144 |
current->plug = NULL; |
73c101011 block: initial pa... |
3145 |
} |
88b996cd0 block: cleanup th... |
3146 |
EXPORT_SYMBOL(blk_finish_plug); |
73c101011 block: initial pa... |
3147 |
|
05229beed block: add block ... |
3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 |
bool blk_poll(struct request_queue *q, blk_qc_t cookie) { struct blk_plug *plug; long state; if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) || !test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return false; plug = current->plug; if (plug) blk_flush_plug_list(plug, false); state = current->state; while (!need_resched()) { unsigned int queue_num = blk_qc_t_to_queue_num(cookie); struct blk_mq_hw_ctx *hctx = q->queue_hw_ctx[queue_num]; int ret; hctx->poll_invoked++; ret = q->mq_ops->poll(hctx, blk_qc_t_to_tag(cookie)); if (ret > 0) { hctx->poll_success++; set_current_state(TASK_RUNNING); return true; } if (signal_pending_state(state, current)) set_current_state(TASK_RUNNING); if (current->state == TASK_RUNNING) return true; if (ret < 0) break; cpu_relax(); } return false; } |
9645c1a23 block: Export blk... |
3188 |
EXPORT_SYMBOL_GPL(blk_poll); |
05229beed block: add block ... |
3189 |
|
47fafbc70 block / PM: Repla... |
3190 |
#ifdef CONFIG_PM |
6c9546675 block: add runtim... |
3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 |
/** * blk_pm_runtime_init - Block layer runtime PM initialization routine * @q: the queue of the device * @dev: the device the queue belongs to * * Description: * Initialize runtime-PM-related fields for @q and start auto suspend for * @dev. Drivers that want to take advantage of request-based runtime PM * should call this function after @dev has been initialized, and its * request queue @q has been allocated, and runtime PM for it can not happen * yet(either due to disabled/forbidden or its usage_count > 0). In most * cases, driver should call this function before any I/O has taken place. * * This function takes care of setting up using auto suspend for the device, * the autosuspend delay is set to -1 to make runtime suspend impossible * until an updated value is either set by user or by driver. Drivers do * not need to touch other autosuspend settings. * * The block layer runtime PM is request based, so only works for drivers * that use request as their IO unit instead of those directly use bio's. */ void blk_pm_runtime_init(struct request_queue *q, struct device *dev) { q->dev = dev; q->rpm_status = RPM_ACTIVE; pm_runtime_set_autosuspend_delay(q->dev, -1); pm_runtime_use_autosuspend(q->dev); } EXPORT_SYMBOL(blk_pm_runtime_init); /** * blk_pre_runtime_suspend - Pre runtime suspend check * @q: the queue of the device * * Description: * This function will check if runtime suspend is allowed for the device * by examining if there are any requests pending in the queue. If there * are requests pending, the device can not be runtime suspended; otherwise, * the queue's status will be updated to SUSPENDING and the driver can * proceed to suspend the device. * * For the not allowed case, we mark last busy for the device so that * runtime PM core will try to autosuspend it some time later. * * This function should be called near the start of the device's * runtime_suspend callback. * * Return: * 0 - OK to runtime suspend the device * -EBUSY - Device should not be runtime suspended */ int blk_pre_runtime_suspend(struct request_queue *q) { int ret = 0; |
4fd41a855 SCSI: Fix NULL po... |
3245 3246 |
if (!q->dev) return ret; |
6c9546675 block: add runtim... |
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 |
spin_lock_irq(q->queue_lock); if (q->nr_pending) { ret = -EBUSY; pm_runtime_mark_last_busy(q->dev); } else { q->rpm_status = RPM_SUSPENDING; } spin_unlock_irq(q->queue_lock); return ret; } EXPORT_SYMBOL(blk_pre_runtime_suspend); /** * blk_post_runtime_suspend - Post runtime suspend processing * @q: the queue of the device * @err: return value of the device's runtime_suspend function * * Description: * Update the queue's runtime status according to the return value of the * device's runtime suspend function and mark last busy for the device so * that PM core will try to auto suspend the device at a later time. * * This function should be called near the end of the device's * runtime_suspend callback. */ void blk_post_runtime_suspend(struct request_queue *q, int err) { |
4fd41a855 SCSI: Fix NULL po... |
3274 3275 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 |
spin_lock_irq(q->queue_lock); if (!err) { q->rpm_status = RPM_SUSPENDED; } else { q->rpm_status = RPM_ACTIVE; pm_runtime_mark_last_busy(q->dev); } spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_post_runtime_suspend); /** * blk_pre_runtime_resume - Pre runtime resume processing * @q: the queue of the device * * Description: * Update the queue's runtime status to RESUMING in preparation for the * runtime resume of the device. * * This function should be called near the start of the device's * runtime_resume callback. */ void blk_pre_runtime_resume(struct request_queue *q) { |
4fd41a855 SCSI: Fix NULL po... |
3300 3301 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 |
spin_lock_irq(q->queue_lock); q->rpm_status = RPM_RESUMING; spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_pre_runtime_resume); /** * blk_post_runtime_resume - Post runtime resume processing * @q: the queue of the device * @err: return value of the device's runtime_resume function * * Description: * Update the queue's runtime status according to the return value of the * device's runtime_resume function. If it is successfully resumed, process * the requests that are queued into the device's queue when it is resuming * and then mark last busy and initiate autosuspend for it. * * This function should be called near the end of the device's * runtime_resume callback. */ void blk_post_runtime_resume(struct request_queue *q, int err) { |
4fd41a855 SCSI: Fix NULL po... |
3324 3325 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3326 3327 3328 3329 3330 |
spin_lock_irq(q->queue_lock); if (!err) { q->rpm_status = RPM_ACTIVE; __blk_run_queue(q); pm_runtime_mark_last_busy(q->dev); |
c60855cdb blkpm: avoid slee... |
3331 |
pm_request_autosuspend(q->dev); |
6c9546675 block: add runtim... |
3332 3333 3334 3335 3336 3337 |
} else { q->rpm_status = RPM_SUSPENDED; } spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_post_runtime_resume); |
d07ab6d11 block: Add blk_se... |
3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 |
/** * blk_set_runtime_active - Force runtime status of the queue to be active * @q: the queue of the device * * If the device is left runtime suspended during system suspend the resume * hook typically resumes the device and corrects runtime status * accordingly. However, that does not affect the queue runtime PM status * which is still "suspended". This prevents processing requests from the * queue. * * This function can be used in driver's resume hook to correct queue * runtime PM status and re-enable peeking requests from the queue. It * should be called before first request is added to the queue. */ void blk_set_runtime_active(struct request_queue *q) { spin_lock_irq(q->queue_lock); q->rpm_status = RPM_ACTIVE; pm_runtime_mark_last_busy(q->dev); pm_request_autosuspend(q->dev); spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_set_runtime_active); |
6c9546675 block: add runtim... |
3362 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3363 3364 |
int __init blk_dev_init(void) { |
9eb55b030 block: catch tryi... |
3365 |
BUILD_BUG_ON(__REQ_NR_BITS > 8 * |
0762b23d2 block: use FIELD_... |
3366 |
FIELD_SIZEOF(struct request, cmd_flags)); |
9eb55b030 block: catch tryi... |
3367 |
|
89b90be2d block: make kbloc... |
3368 3369 |
/* used for unplugging and affects IO latency/throughput - HIGHPRI */ kblockd_workqueue = alloc_workqueue("kblockd", |
28747fcd2 block: remove WQ_... |
3370 |
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); |
1da177e4c Linux-2.6.12-rc2 |
3371 3372 3373 3374 3375 |
if (!kblockd_workqueue) panic("Failed to create kblockd "); request_cachep = kmem_cache_create("blkdev_requests", |
20c2df83d mm: Remove slab d... |
3376 |
sizeof(struct request), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
3377 |
|
c2789bd40 block: rename req... |
3378 |
blk_requestq_cachep = kmem_cache_create("request_queue", |
165125e1e [BLOCK] Get rid o... |
3379 |
sizeof(struct request_queue), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
3380 |
|
d38ecf935 io context sharin... |
3381 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3382 |
} |