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block/blk-core.c
98.4 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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#include <linux/debugfs.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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#include "blk-mq-sched.h" |
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#include "blk-wbt.h" |
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|
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#ifdef CONFIG_DEBUG_FS struct dentry *blk_debugfs_root; #endif |
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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) |
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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) |
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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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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->tag = -1; |
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rq->internal_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 const struct { int errno; const char *name; } blk_errors[] = { [BLK_STS_OK] = { 0, "" }, [BLK_STS_NOTSUPP] = { -EOPNOTSUPP, "operation not supported" }, [BLK_STS_TIMEOUT] = { -ETIMEDOUT, "timeout" }, [BLK_STS_NOSPC] = { -ENOSPC, "critical space allocation" }, [BLK_STS_TRANSPORT] = { -ENOLINK, "recoverable transport" }, [BLK_STS_TARGET] = { -EREMOTEIO, "critical target" }, [BLK_STS_NEXUS] = { -EBADE, "critical nexus" }, [BLK_STS_MEDIUM] = { -ENODATA, "critical medium" }, [BLK_STS_PROTECTION] = { -EILSEQ, "protection" }, [BLK_STS_RESOURCE] = { -ENOMEM, "kernel resource" }, |
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[BLK_STS_AGAIN] = { -EAGAIN, "nonblocking retry" }, |
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|
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/* device mapper special case, should not leak out: */ [BLK_STS_DM_REQUEUE] = { -EREMCHG, "dm internal retry" }, |
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/* everything else not covered above: */ [BLK_STS_IOERR] = { -EIO, "I/O" }, }; blk_status_t errno_to_blk_status(int errno) { int i; for (i = 0; i < ARRAY_SIZE(blk_errors); i++) { if (blk_errors[i].errno == errno) return (__force blk_status_t)i; } return BLK_STS_IOERR; } EXPORT_SYMBOL_GPL(errno_to_blk_status); int blk_status_to_errno(blk_status_t status) { int idx = (__force int)status; |
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if (WARN_ON_ONCE(idx >= ARRAY_SIZE(blk_errors))) |
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return -EIO; return blk_errors[idx].errno; } EXPORT_SYMBOL_GPL(blk_status_to_errno); static void print_req_error(struct request *req, blk_status_t status) { int idx = (__force int)status; |
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if (WARN_ON_ONCE(idx >= ARRAY_SIZE(blk_errors))) |
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return; printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu ", __func__, blk_errors[idx].name, req->rq_disk ? req->rq_disk->disk_name : "?", (unsigned long long)blk_rq_pos(req)); } |
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static void req_bio_endio(struct request *rq, struct bio *bio, |
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unsigned int nbytes, blk_status_t error) |
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{ |
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if (error) |
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bio->bi_status = error; |
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if (unlikely(rq->rq_flags & RQF_QUIET)) |
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bio_set_flag(bio, BIO_QUIET); |
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bio_advance(bio, nbytes); |
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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->rq_flags & RQF_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) { |
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printk(KERN_INFO "%s: dev %s: flags=%llx ", msg, rq->rq_disk ? rq->rq_disk->disk_name : "?", |
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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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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. |
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*/ void blk_delay_queue(struct request_queue *q, unsigned long msecs) |
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{ |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON_ONCE(q->mq_ops); |
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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) { |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON_ONCE(q->mq_ops); |
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|
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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 |
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* entered. Also see blk_stop_queue(). |
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**/ |
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void blk_start_queue(struct request_queue *q) |
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{ |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON(!in_interrupt() && !irqs_disabled()); |
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WARN_ON_ONCE(q->mq_ops); |
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|
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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 |
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* blk_start_queue() to restart queue operations. |
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**/ |
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void blk_stop_queue(struct request_queue *q) |
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{ |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON_ONCE(q->mq_ops); |
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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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cancel_work_sync(&q->timeout_work); |
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if (q->mq_ops) { struct blk_mq_hw_ctx *hctx; int i; |
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cancel_delayed_work_sync(&q->requeue_work); |
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queue_for_each_hw_ctx(q, hctx, i) |
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cancel_delayed_work_sync(&hctx->run_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) { |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON_ONCE(q->mq_ops); |
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|
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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: |
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* See @blk_run_queue. |
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*/ |
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void __blk_run_queue(struct request_queue *q) |
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{ |
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lockdep_assert_held(q->queue_lock); |
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WARN_ON_ONCE(q->mq_ops); |
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|
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if (unlikely(blk_queue_stopped(q))) return; |
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__blk_run_queue_uncond(q); |
75ad23bc0 block: make queue... |
390 391 |
} EXPORT_SYMBOL(__blk_run_queue); |
dac07ec12 [BLOCK] limit req... |
392 |
|
75ad23bc0 block: make queue... |
393 |
/** |
24ecfbe27 block: add blk_ru... |
394 395 396 397 398 |
* 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 |
2fff8a924 block: Check lock... |
399 400 401 402 403 404 |
* of us. * * Note: * Since it is not allowed to run q->delay_work after blk_cleanup_queue() * has canceled q->delay_work, callers must hold the queue lock to avoid * race conditions between blk_cleanup_queue() and blk_run_queue_async(). |
24ecfbe27 block: add blk_ru... |
405 406 407 |
*/ void blk_run_queue_async(struct request_queue *q) { |
2fff8a924 block: Check lock... |
408 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
409 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
410 |
|
704605711 block: Avoid sche... |
411 |
if (likely(!blk_queue_stopped(q) && !blk_queue_dead(q))) |
e7c2f9674 workqueue: use mo... |
412 |
mod_delayed_work(kblockd_workqueue, &q->delay_work, 0); |
24ecfbe27 block: add blk_ru... |
413 |
} |
c21e6beba block: get rid of... |
414 |
EXPORT_SYMBOL(blk_run_queue_async); |
24ecfbe27 block: add blk_ru... |
415 416 |
/** |
75ad23bc0 block: make queue... |
417 418 |
* blk_run_queue - run a single device queue * @q: The queue to run |
80a4b58e3 block: only call ... |
419 420 421 |
* * Description: * Invoke request handling on this queue, if it has pending work to do. |
a7f557923 block: kill blk_s... |
422 |
* May be used to restart queueing when a request has completed. |
75ad23bc0 block: make queue... |
423 424 425 426 |
*/ void blk_run_queue(struct request_queue *q) { unsigned long flags; |
332ebbf7f block: Document w... |
427 |
WARN_ON_ONCE(q->mq_ops); |
75ad23bc0 block: make queue... |
428 |
spin_lock_irqsave(q->queue_lock, flags); |
24ecfbe27 block: add blk_ru... |
429 |
__blk_run_queue(q); |
1da177e4c Linux-2.6.12-rc2 |
430 431 432 |
spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_run_queue); |
165125e1e [BLOCK] Get rid o... |
433 |
void blk_put_queue(struct request_queue *q) |
483f4afc4 [PATCH] fix sysfs... |
434 435 436 |
{ kobject_put(&q->kobj); } |
d86e0e83b block: export blk... |
437 |
EXPORT_SYMBOL(blk_put_queue); |
483f4afc4 [PATCH] fix sysfs... |
438 |
|
e3c78ca52 block: reorganize... |
439 |
/** |
807592a4f block: Let blk_dr... |
440 |
* __blk_drain_queue - drain requests from request_queue |
e3c78ca52 block: reorganize... |
441 |
* @q: queue to drain |
c9a929dde block: fix reques... |
442 |
* @drain_all: whether to drain all requests or only the ones w/ ELVPRIV |
e3c78ca52 block: reorganize... |
443 |
* |
c9a929dde block: fix reques... |
444 445 446 |
* 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. |
e3c78ca52 block: reorganize... |
447 |
*/ |
807592a4f block: Let blk_dr... |
448 449 450 |
static void __blk_drain_queue(struct request_queue *q, bool drain_all) __releases(q->queue_lock) __acquires(q->queue_lock) |
e3c78ca52 block: reorganize... |
451 |
{ |
458f27a98 block: Avoid miss... |
452 |
int i; |
807592a4f block: Let blk_dr... |
453 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
454 |
WARN_ON_ONCE(q->mq_ops); |
807592a4f block: Let blk_dr... |
455 |
|
e3c78ca52 block: reorganize... |
456 |
while (true) { |
481a7d647 block: fix drain_... |
457 |
bool drain = false; |
e3c78ca52 block: reorganize... |
458 |
|
b855b04a0 block: blk-thrott... |
459 460 461 462 463 464 |
/* * The caller might be trying to drain @q before its * elevator is initialized. */ if (q->elevator) elv_drain_elevator(q); |
5efd61135 blkcg: add blkcg_... |
465 |
blkcg_drain_queue(q); |
e3c78ca52 block: reorganize... |
466 |
|
4eabc9412 block: don't kick... |
467 468 |
/* * This function might be called on a queue which failed |
b855b04a0 block: blk-thrott... |
469 470 471 472 |
* 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... |
473 |
*/ |
b855b04a0 block: blk-thrott... |
474 |
if (!list_empty(&q->queue_head) && q->request_fn) |
4eabc9412 block: don't kick... |
475 |
__blk_run_queue(q); |
c9a929dde block: fix reques... |
476 |
|
8a5ecdd42 block: add q->nr_... |
477 |
drain |= q->nr_rqs_elvpriv; |
24faf6f60 block: Make blk_c... |
478 |
drain |= q->request_fn_active; |
481a7d647 block: fix drain_... |
479 480 481 482 483 484 485 |
/* * 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 ... |
486 |
struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); |
481a7d647 block: fix drain_... |
487 488 |
drain |= !list_empty(&q->queue_head); for (i = 0; i < 2; i++) { |
8a5ecdd42 block: add q->nr_... |
489 |
drain |= q->nr_rqs[i]; |
481a7d647 block: fix drain_... |
490 |
drain |= q->in_flight[i]; |
7c94e1c15 block: introduce ... |
491 492 |
if (fq) drain |= !list_empty(&fq->flush_queue[i]); |
481a7d647 block: fix drain_... |
493 494 |
} } |
e3c78ca52 block: reorganize... |
495 |
|
481a7d647 block: fix drain_... |
496 |
if (!drain) |
e3c78ca52 block: reorganize... |
497 |
break; |
807592a4f block: Let blk_dr... |
498 499 |
spin_unlock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
500 |
msleep(10); |
807592a4f block: Let blk_dr... |
501 502 |
spin_lock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
503 |
} |
458f27a98 block: Avoid miss... |
504 505 506 507 508 509 510 |
/* * 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 ... |
511 |
struct request_list *rl; |
a051661ca blkcg: implement ... |
512 513 514 |
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... |
515 |
} |
e3c78ca52 block: reorganize... |
516 |
} |
7e3acce11 block: drain queu... |
517 518 519 520 521 522 |
void blk_drain_queue(struct request_queue *q) { spin_lock_irq(q->queue_lock); __blk_drain_queue(q, true); spin_unlock_irq(q->queue_lock); } |
c9a929dde block: fix reques... |
523 |
/** |
d732580b4 block: implement ... |
524 525 526 527 528 |
* 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... |
529 |
* throttled or issued before. On return, it's guaranteed that no request |
80fd99792 blkcg: make sure ... |
530 531 |
* is being throttled or has ELVPRIV set and blk_queue_bypass() %true * inside queue or RCU read lock. |
d732580b4 block: implement ... |
532 533 534 |
*/ void blk_queue_bypass_start(struct request_queue *q) { |
332ebbf7f block: Document w... |
535 |
WARN_ON_ONCE(q->mq_ops); |
d732580b4 block: implement ... |
536 |
spin_lock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
537 |
q->bypass_depth++; |
d732580b4 block: implement ... |
538 539 |
queue_flag_set(QUEUE_FLAG_BYPASS, q); spin_unlock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
540 541 542 543 544 545 |
/* * 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... |
546 547 548 |
spin_lock_irq(q->queue_lock); __blk_drain_queue(q, false); spin_unlock_irq(q->queue_lock); |
b82d4b197 blkcg: make reque... |
549 550 551 |
/* ensure blk_queue_bypass() is %true inside RCU read lock */ synchronize_rcu(); } |
d732580b4 block: implement ... |
552 553 554 555 556 557 558 559 |
} 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. |
332ebbf7f block: Document w... |
560 561 562 |
* * Note: although blk_queue_bypass_start() is only called for blk-sq queues, * this function is called for both blk-sq and blk-mq queues. |
d732580b4 block: implement ... |
563 564 565 566 567 568 569 570 571 572 |
*/ 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... |
573 574 |
void blk_set_queue_dying(struct request_queue *q) { |
1b8560868 block: Fix race t... |
575 576 577 |
spin_lock_irq(q->queue_lock); queue_flag_set(QUEUE_FLAG_DYING, q); spin_unlock_irq(q->queue_lock); |
aed3ea94b block: wake up wa... |
578 |
|
d3cfb2a0a block: block new ... |
579 580 581 582 583 584 |
/* * When queue DYING flag is set, we need to block new req * entering queue, so we call blk_freeze_queue_start() to * prevent I/O from crossing blk_queue_enter(). */ blk_freeze_queue_start(q); |
aed3ea94b block: wake up wa... |
585 586 587 588 |
if (q->mq_ops) blk_mq_wake_waiters(q); else { struct request_list *rl; |
bbfc3c5d6 block: queue lock... |
589 |
spin_lock_irq(q->queue_lock); |
aed3ea94b block: wake up wa... |
590 591 |
blk_queue_for_each_rl(rl, q) { if (rl->rq_pool) { |
60bed713a block: wake up al... |
592 593 |
wake_up_all(&rl->wait[BLK_RW_SYNC]); wake_up_all(&rl->wait[BLK_RW_ASYNC]); |
aed3ea94b block: wake up wa... |
594 595 |
} } |
bbfc3c5d6 block: queue lock... |
596 |
spin_unlock_irq(q->queue_lock); |
aed3ea94b block: wake up wa... |
597 598 599 |
} } EXPORT_SYMBOL_GPL(blk_set_queue_dying); |
d732580b4 block: implement ... |
600 |
/** |
c9a929dde block: fix reques... |
601 602 603 |
* blk_cleanup_queue - shutdown a request queue * @q: request queue to shutdown * |
c246e80d8 block: Avoid that... |
604 605 |
* 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... |
606 |
*/ |
6728cb0e6 block: make core ... |
607 |
void blk_cleanup_queue(struct request_queue *q) |
483f4afc4 [PATCH] fix sysfs... |
608 |
{ |
c9a929dde block: fix reques... |
609 |
spinlock_t *lock = q->queue_lock; |
e3335de94 block: blk_cleanu... |
610 |
|
3f3299d5c block: Rename que... |
611 |
/* mark @q DYING, no new request or merges will be allowed afterwards */ |
483f4afc4 [PATCH] fix sysfs... |
612 |
mutex_lock(&q->sysfs_lock); |
aed3ea94b block: wake up wa... |
613 |
blk_set_queue_dying(q); |
c9a929dde block: fix reques... |
614 |
spin_lock_irq(lock); |
6ecf23afa block: extend que... |
615 |
|
80fd99792 blkcg: make sure ... |
616 |
/* |
3f3299d5c block: Rename que... |
617 |
* A dying queue is permanently in bypass mode till released. Note |
80fd99792 blkcg: make sure ... |
618 619 620 621 622 623 624 |
* 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... |
625 626 |
q->bypass_depth++; queue_flag_set(QUEUE_FLAG_BYPASS, q); |
c9a929dde block: fix reques... |
627 628 |
queue_flag_set(QUEUE_FLAG_NOMERGES, q); queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
3f3299d5c block: Rename que... |
629 |
queue_flag_set(QUEUE_FLAG_DYING, q); |
c9a929dde block: fix reques... |
630 631 |
spin_unlock_irq(lock); mutex_unlock(&q->sysfs_lock); |
c246e80d8 block: Avoid that... |
632 633 634 635 |
/* * 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... |
636 |
blk_freeze_queue(q); |
9c1051aac blk-mq: untangle ... |
637 |
spin_lock_irq(lock); |
c246e80d8 block: Avoid that... |
638 |
queue_flag_set(QUEUE_FLAG_DEAD, q); |
807592a4f block: Let blk_dr... |
639 |
spin_unlock_irq(lock); |
c9a929dde block: fix reques... |
640 |
|
392640fd1 blk-mq: quiesce q... |
641 642 643 644 |
/* * make sure all in-progress dispatch are completed because * blk_freeze_queue() can only complete all requests, and * dispatch may still be in-progress since we dispatch requests |
b520f00da blk-mq: avoid to ... |
645 646 647 648 649 |
* from more than one contexts. * * No need to quiesce queue if it isn't initialized yet since * blk_freeze_queue() should be enough for cases of passthrough * request. |
392640fd1 blk-mq: quiesce q... |
650 |
*/ |
b520f00da blk-mq: avoid to ... |
651 |
if (q->mq_ops && blk_queue_init_done(q)) |
392640fd1 blk-mq: quiesce q... |
652 |
blk_mq_quiesce_queue(q); |
5a48fc147 block: blk_flush_... |
653 654 |
/* for synchronous bio-based driver finish in-flight integrity i/o */ blk_flush_integrity(); |
c9a929dde block: fix reques... |
655 |
/* @q won't process any more request, flush async actions */ |
dc3b17cc8 block: Use pointe... |
656 |
del_timer_sync(&q->backing_dev_info->laptop_mode_wb_timer); |
c9a929dde block: fix reques... |
657 |
blk_sync_queue(q); |
45a9c9d90 blk-mq: Fix a use... |
658 659 |
if (q->mq_ops) blk_mq_free_queue(q); |
3ef28e83a block: generic re... |
660 |
percpu_ref_exit(&q->q_usage_counter); |
45a9c9d90 blk-mq: Fix a use... |
661 |
|
5e5cfac0c block: Mitigate l... |
662 663 664 665 |
spin_lock_irq(lock); if (q->queue_lock != &q->__queue_lock) q->queue_lock = &q->__queue_lock; spin_unlock_irq(lock); |
c9a929dde block: fix reques... |
666 |
/* @q is and will stay empty, shutdown and put */ |
483f4afc4 [PATCH] fix sysfs... |
667 668 |
blk_put_queue(q); } |
1da177e4c Linux-2.6.12-rc2 |
669 |
EXPORT_SYMBOL(blk_cleanup_queue); |
271508dba block: allocate r... |
670 |
/* Allocate memory local to the request queue */ |
6d247d7f7 block: allow spec... |
671 |
static void *alloc_request_simple(gfp_t gfp_mask, void *data) |
271508dba block: allocate r... |
672 |
{ |
6d247d7f7 block: allow spec... |
673 674 675 |
struct request_queue *q = data; return kmem_cache_alloc_node(request_cachep, gfp_mask, q->node); |
271508dba block: allocate r... |
676 |
} |
6d247d7f7 block: allow spec... |
677 |
static void free_request_simple(void *element, void *data) |
271508dba block: allocate r... |
678 679 680 |
{ kmem_cache_free(request_cachep, element); } |
6d247d7f7 block: allow spec... |
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 |
static void *alloc_request_size(gfp_t gfp_mask, void *data) { struct request_queue *q = data; struct request *rq; rq = kmalloc_node(sizeof(struct request) + q->cmd_size, gfp_mask, q->node); if (rq && q->init_rq_fn && q->init_rq_fn(q, rq, gfp_mask) < 0) { kfree(rq); rq = NULL; } return rq; } static void free_request_size(void *element, void *data) { struct request_queue *q = data; if (q->exit_rq_fn) q->exit_rq_fn(q, element); kfree(element); } |
5b788ce3e block: prepare fo... |
703 704 |
int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
705 |
{ |
1abec4fdb block: make blk_i... |
706 707 |
if (unlikely(rl->rq_pool)) return 0; |
5b788ce3e block: prepare fo... |
708 |
rl->q = q; |
1faa16d22 block: change the... |
709 710 |
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... |
711 712 |
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]); init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]); |
1da177e4c Linux-2.6.12-rc2 |
713 |
|
6d247d7f7 block: allow spec... |
714 715 716 717 718 719 720 721 722 |
if (q->cmd_size) { rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_size, free_request_size, q, gfp_mask, q->node); } else { rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_simple, free_request_simple, q, gfp_mask, q->node); } |
1da177e4c Linux-2.6.12-rc2 |
723 724 |
if (!rl->rq_pool) return -ENOMEM; |
b425e5049 block: Avoid that... |
725 726 |
if (rl != &q->root_rl) WARN_ON_ONCE(!blk_get_queue(q)); |
1da177e4c Linux-2.6.12-rc2 |
727 728 |
return 0; } |
b425e5049 block: Avoid that... |
729 |
void blk_exit_rl(struct request_queue *q, struct request_list *rl) |
5b788ce3e block: prepare fo... |
730 |
{ |
b425e5049 block: Avoid that... |
731 |
if (rl->rq_pool) { |
5b788ce3e block: prepare fo... |
732 |
mempool_destroy(rl->rq_pool); |
b425e5049 block: Avoid that... |
733 734 735 |
if (rl != &q->root_rl) blk_put_queue(q); } |
5b788ce3e block: prepare fo... |
736 |
} |
165125e1e [BLOCK] Get rid o... |
737 |
struct request_queue *blk_alloc_queue(gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
738 |
{ |
c304a51bf block: use NUMA_N... |
739 |
return blk_alloc_queue_node(gfp_mask, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
740 741 |
} EXPORT_SYMBOL(blk_alloc_queue); |
1da177e4c Linux-2.6.12-rc2 |
742 |
|
6f3b0e8bc blk-mq: add a fla... |
743 |
int blk_queue_enter(struct request_queue *q, bool nowait) |
3ef28e83a block: generic re... |
744 745 |
{ while (true) { |
3ef28e83a block: generic re... |
746 747 748 |
if (percpu_ref_tryget_live(&q->q_usage_counter)) return 0; |
6f3b0e8bc blk-mq: add a fla... |
749 |
if (nowait) |
3ef28e83a block: generic re... |
750 |
return -EBUSY; |
5ed61d3f0 block: add a read... |
751 |
/* |
1671d522c block: rename blk... |
752 |
* read pair of barrier in blk_freeze_queue_start(), |
5ed61d3f0 block: add a read... |
753 |
* we need to order reading __PERCPU_REF_DEAD flag of |
d3cfb2a0a block: block new ... |
754 755 756 |
* .q_usage_counter and reading .mq_freeze_depth or * queue dying flag, otherwise the following wait may * never return if the two reads are reordered. |
5ed61d3f0 block: add a read... |
757 758 |
*/ smp_rmb(); |
aa6be3967 block: do not use... |
759 760 761 |
wait_event(q->mq_freeze_wq, !atomic_read(&q->mq_freeze_depth) || blk_queue_dying(q)); |
3ef28e83a block: generic re... |
762 763 |
if (blk_queue_dying(q)) return -ENODEV; |
3ef28e83a block: generic re... |
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
} } 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... |
779 780 781 782 783 784 |
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... |
785 |
struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) |
1946089a1 [PATCH] NUMA awar... |
786 |
{ |
165125e1e [BLOCK] Get rid o... |
787 |
struct request_queue *q; |
1946089a1 [PATCH] NUMA awar... |
788 |
|
8324aa91d block: split tag ... |
789 |
q = kmem_cache_alloc_node(blk_requestq_cachep, |
94f6030ca Slab allocators: ... |
790 |
gfp_mask | __GFP_ZERO, node_id); |
1da177e4c Linux-2.6.12-rc2 |
791 792 |
if (!q) return NULL; |
00380a404 block: blk_alloc_... |
793 |
q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask); |
a73f730d0 block, cfq: move ... |
794 |
if (q->id < 0) |
3d2936f45 block: only alloc... |
795 |
goto fail_q; |
a73f730d0 block, cfq: move ... |
796 |
|
93b27e729 blk: use non-resc... |
797 |
q->bio_split = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
54efd50bf block: make gener... |
798 799 |
if (!q->bio_split) goto fail_id; |
d03f6cdc1 block: Dynamicall... |
800 801 802 |
q->backing_dev_info = bdi_alloc_node(gfp_mask, node_id); if (!q->backing_dev_info) goto fail_split; |
a83b576c9 block: fix stacke... |
803 804 805 |
q->stats = blk_alloc_queue_stats(); if (!q->stats) goto fail_stats; |
dc3b17cc8 block: Use pointe... |
806 |
q->backing_dev_info->ra_pages = |
09cbfeaf1 mm, fs: get rid o... |
807 |
(VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
dc3b17cc8 block: Use pointe... |
808 809 |
q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK; q->backing_dev_info->name = "block"; |
5151412dd block: initialize... |
810 |
q->node = node_id; |
0989a025d block: don't over... |
811 |
|
dc3b17cc8 block: Use pointe... |
812 |
setup_timer(&q->backing_dev_info->laptop_mode_wb_timer, |
31373d09d laptop-mode: Make... |
813 |
laptop_mode_timer_fn, (unsigned long) q); |
242f9dcb8 block: unify requ... |
814 |
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); |
77a38e88c block: Fix a race... |
815 |
INIT_WORK(&q->timeout_work, NULL); |
b855b04a0 block: blk-thrott... |
816 |
INIT_LIST_HEAD(&q->queue_head); |
242f9dcb8 block: unify requ... |
817 |
INIT_LIST_HEAD(&q->timeout_list); |
a612fddf0 block, cfq: move ... |
818 |
INIT_LIST_HEAD(&q->icq_list); |
4eef30499 blkcg: move per-q... |
819 |
#ifdef CONFIG_BLK_CGROUP |
e8989fae3 blkcg: unify blkg... |
820 |
INIT_LIST_HEAD(&q->blkg_list); |
4eef30499 blkcg: move per-q... |
821 |
#endif |
3cca6dc1c block: add API fo... |
822 |
INIT_DELAYED_WORK(&q->delay_work, blk_delay_work); |
483f4afc4 [PATCH] fix sysfs... |
823 |
|
8324aa91d block: split tag ... |
824 |
kobject_init(&q->kobj, &blk_queue_ktype); |
1da177e4c Linux-2.6.12-rc2 |
825 |
|
5acb3cc2c blktrace: Fix pot... |
826 827 828 |
#ifdef CONFIG_BLK_DEV_IO_TRACE mutex_init(&q->blk_trace_mutex); #endif |
483f4afc4 [PATCH] fix sysfs... |
829 |
mutex_init(&q->sysfs_lock); |
e7e72bf64 Remove blkdev war... |
830 |
spin_lock_init(&q->__queue_lock); |
483f4afc4 [PATCH] fix sysfs... |
831 |
|
c94a96ac9 block: Initialize... |
832 833 834 835 836 |
/* * 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... |
837 838 839 |
/* * 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... |
840 841 |
* init. The initial bypass will be finished when the queue is * registered by blk_register_queue(). |
b82d4b197 blkcg: make reque... |
842 843 844 |
*/ q->bypass_depth = 1; __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); |
320ae51fe blk-mq: new multi... |
845 |
init_waitqueue_head(&q->mq_freeze_wq); |
3ef28e83a block: generic re... |
846 847 848 849 850 851 852 |
/* * 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... |
853 |
goto fail_bdi; |
f51b802c1 blkcg: use the us... |
854 |
|
3ef28e83a block: generic re... |
855 856 |
if (blkcg_init_queue(q)) goto fail_ref; |
1da177e4c Linux-2.6.12-rc2 |
857 |
return q; |
a73f730d0 block, cfq: move ... |
858 |
|
3ef28e83a block: generic re... |
859 860 |
fail_ref: percpu_ref_exit(&q->q_usage_counter); |
fff4996b7 blk-core: Fix mem... |
861 |
fail_bdi: |
a83b576c9 block: fix stacke... |
862 863 |
blk_free_queue_stats(q->stats); fail_stats: |
d03f6cdc1 block: Dynamicall... |
864 |
bdi_put(q->backing_dev_info); |
54efd50bf block: make gener... |
865 866 |
fail_split: bioset_free(q->bio_split); |
a73f730d0 block, cfq: move ... |
867 868 869 870 871 |
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 |
872 |
} |
1946089a1 [PATCH] NUMA awar... |
873 |
EXPORT_SYMBOL(blk_alloc_queue_node); |
1da177e4c Linux-2.6.12-rc2 |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 |
/** * 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... |
897 898 |
* request queue; this lock will be taken also from interrupt context, so irq * disabling is needed for it. |
1da177e4c Linux-2.6.12-rc2 |
899 |
* |
710027a48 Add some block/ s... |
900 |
* Function returns a pointer to the initialized request queue, or %NULL if |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 904 905 906 |
* 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... |
907 |
|
165125e1e [BLOCK] Get rid o... |
908 |
struct request_queue *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock) |
1da177e4c Linux-2.6.12-rc2 |
909 |
{ |
c304a51bf block: use NUMA_N... |
910 |
return blk_init_queue_node(rfn, lock, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
911 912 |
} EXPORT_SYMBOL(blk_init_queue); |
165125e1e [BLOCK] Get rid o... |
913 |
struct request_queue * |
1946089a1 [PATCH] NUMA awar... |
914 915 |
blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { |
5ea708d15 block: simplify b... |
916 |
struct request_queue *q; |
1da177e4c Linux-2.6.12-rc2 |
917 |
|
5ea708d15 block: simplify b... |
918 919 |
q = blk_alloc_queue_node(GFP_KERNEL, node_id); if (!q) |
c86d1b8ae block: avoid unco... |
920 |
return NULL; |
5ea708d15 block: simplify b... |
921 922 923 924 925 926 927 |
q->request_fn = rfn; if (lock) q->queue_lock = lock; if (blk_init_allocated_queue(q) < 0) { blk_cleanup_queue(q); return NULL; } |
18741986a blk-mq: rework fl... |
928 |
|
7982e90c3 block: fix q->flu... |
929 |
return q; |
01effb0dc block: allow init... |
930 931 |
} EXPORT_SYMBOL(blk_init_queue_node); |
dece16353 block: change ->m... |
932 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio); |
336b7e1f2 block: remove exp... |
933 |
|
1da177e4c Linux-2.6.12-rc2 |
934 |
|
5ea708d15 block: simplify b... |
935 936 |
int blk_init_allocated_queue(struct request_queue *q) { |
332ebbf7f block: Document w... |
937 |
WARN_ON_ONCE(q->mq_ops); |
6d247d7f7 block: allow spec... |
938 |
q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, q->cmd_size); |
ba483388e block: remove blk... |
939 |
if (!q->fq) |
5ea708d15 block: simplify b... |
940 |
return -ENOMEM; |
7982e90c3 block: fix q->flu... |
941 |
|
6d247d7f7 block: allow spec... |
942 943 |
if (q->init_rq_fn && q->init_rq_fn(q, q->fq->flush_rq, GFP_KERNEL)) goto out_free_flush_queue; |
7982e90c3 block: fix q->flu... |
944 |
|
a051661ca blkcg: implement ... |
945 |
if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) |
6d247d7f7 block: allow spec... |
946 |
goto out_exit_flush_rq; |
1da177e4c Linux-2.6.12-rc2 |
947 |
|
287922eb0 block: defer time... |
948 |
INIT_WORK(&q->timeout_work, blk_timeout_work); |
60ea8226c block: fix reques... |
949 |
q->queue_flags |= QUEUE_FLAG_DEFAULT; |
c94a96ac9 block: Initialize... |
950 |
|
f3b144aa7 block: remove var... |
951 952 953 |
/* * This also sets hw/phys segments, boundary and size */ |
c20e8de27 block: rename __m... |
954 |
blk_queue_make_request(q, blk_queue_bio); |
1da177e4c Linux-2.6.12-rc2 |
955 |
|
44ec95425 [SCSI] sg: cap re... |
956 |
q->sg_reserved_size = INT_MAX; |
eb1c160b2 elevator: Fix a r... |
957 958 |
/* Protect q->elevator from elevator_change */ mutex_lock(&q->sysfs_lock); |
b82d4b197 blkcg: make reque... |
959 |
/* init elevator */ |
eb1c160b2 elevator: Fix a r... |
960 961 |
if (elevator_init(q, NULL)) { mutex_unlock(&q->sysfs_lock); |
6d247d7f7 block: allow spec... |
962 |
goto out_exit_flush_rq; |
eb1c160b2 elevator: Fix a r... |
963 964 965 |
} mutex_unlock(&q->sysfs_lock); |
5ea708d15 block: simplify b... |
966 |
return 0; |
eb1c160b2 elevator: Fix a r... |
967 |
|
6d247d7f7 block: allow spec... |
968 969 970 971 |
out_exit_flush_rq: if (q->exit_rq_fn) q->exit_rq_fn(q, q->fq->flush_rq); out_free_flush_queue: |
ba483388e block: remove blk... |
972 |
blk_free_flush_queue(q->fq); |
0affbaece block: blk_init_a... |
973 |
q->fq = NULL; |
5ea708d15 block: simplify b... |
974 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
975 |
} |
5151412dd block: initialize... |
976 |
EXPORT_SYMBOL(blk_init_allocated_queue); |
1da177e4c Linux-2.6.12-rc2 |
977 |
|
09ac46c42 block: misc updat... |
978 |
bool blk_get_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
979 |
{ |
3f3299d5c block: Rename que... |
980 |
if (likely(!blk_queue_dying(q))) { |
09ac46c42 block: misc updat... |
981 982 |
__blk_get_queue(q); return true; |
1da177e4c Linux-2.6.12-rc2 |
983 |
} |
09ac46c42 block: misc updat... |
984 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
985 |
} |
d86e0e83b block: export blk... |
986 |
EXPORT_SYMBOL(blk_get_queue); |
1da177e4c Linux-2.6.12-rc2 |
987 |
|
5b788ce3e block: prepare fo... |
988 |
static inline void blk_free_request(struct request_list *rl, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
989 |
{ |
e80640213 block: split out ... |
990 |
if (rq->rq_flags & RQF_ELVPRIV) { |
5b788ce3e block: prepare fo... |
991 |
elv_put_request(rl->q, rq); |
f1f8cc946 block, cfq: move ... |
992 |
if (rq->elv.icq) |
11a3122f6 block: strip out ... |
993 |
put_io_context(rq->elv.icq->ioc); |
f1f8cc946 block, cfq: move ... |
994 |
} |
5b788ce3e block: prepare fo... |
995 |
mempool_free(rq, rl->rq_pool); |
1da177e4c Linux-2.6.12-rc2 |
996 |
} |
1da177e4c Linux-2.6.12-rc2 |
997 998 999 1000 |
/* * 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... |
1001 |
static inline int ioc_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 |
{ 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... |
1022 |
static void ioc_set_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1023 1024 1025 1026 1027 1028 1029 |
{ if (!ioc || ioc_batching(q, ioc)) return; ioc->nr_batch_requests = q->nr_batching; ioc->last_waited = jiffies; } |
5b788ce3e block: prepare fo... |
1030 |
static void __freed_request(struct request_list *rl, int sync) |
1da177e4c Linux-2.6.12-rc2 |
1031 |
{ |
5b788ce3e block: prepare fo... |
1032 |
struct request_queue *q = rl->q; |
1da177e4c Linux-2.6.12-rc2 |
1033 |
|
d40f75a06 writeback, blkcg:... |
1034 1035 |
if (rl->count[sync] < queue_congestion_off_threshold(q)) blk_clear_congested(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1036 |
|
1faa16d22 block: change the... |
1037 1038 1039 |
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 |
1040 |
|
5b788ce3e block: prepare fo... |
1041 |
blk_clear_rl_full(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1042 1043 1044 1045 1046 1047 1048 |
} } /* * A request has just been released. Account for it, update the full and * congestion status, wake up any waiters. Called under q->queue_lock. */ |
e80640213 block: split out ... |
1049 1050 |
static void freed_request(struct request_list *rl, bool sync, req_flags_t rq_flags) |
1da177e4c Linux-2.6.12-rc2 |
1051 |
{ |
5b788ce3e block: prepare fo... |
1052 |
struct request_queue *q = rl->q; |
1da177e4c Linux-2.6.12-rc2 |
1053 |
|
8a5ecdd42 block: add q->nr_... |
1054 |
q->nr_rqs[sync]--; |
1faa16d22 block: change the... |
1055 |
rl->count[sync]--; |
e80640213 block: split out ... |
1056 |
if (rq_flags & RQF_ELVPRIV) |
8a5ecdd42 block: add q->nr_... |
1057 |
q->nr_rqs_elvpriv--; |
1da177e4c Linux-2.6.12-rc2 |
1058 |
|
5b788ce3e block: prepare fo... |
1059 |
__freed_request(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1060 |
|
1faa16d22 block: change the... |
1061 |
if (unlikely(rl->starved[sync ^ 1])) |
5b788ce3e block: prepare fo... |
1062 |
__freed_request(rl, sync ^ 1); |
1da177e4c Linux-2.6.12-rc2 |
1063 |
} |
e3a2b3f93 blk-mq: allow cha... |
1064 1065 1066 |
int blk_update_nr_requests(struct request_queue *q, unsigned int nr) { struct request_list *rl; |
d40f75a06 writeback, blkcg:... |
1067 |
int on_thresh, off_thresh; |
e3a2b3f93 blk-mq: allow cha... |
1068 |
|
332ebbf7f block: Document w... |
1069 |
WARN_ON_ONCE(q->mq_ops); |
e3a2b3f93 blk-mq: allow cha... |
1070 1071 1072 |
spin_lock_irq(q->queue_lock); q->nr_requests = nr; blk_queue_congestion_threshold(q); |
d40f75a06 writeback, blkcg:... |
1073 1074 |
on_thresh = queue_congestion_on_threshold(q); off_thresh = queue_congestion_off_threshold(q); |
e3a2b3f93 blk-mq: allow cha... |
1075 |
|
d40f75a06 writeback, blkcg:... |
1076 1077 1078 1079 1080 |
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... |
1081 |
|
d40f75a06 writeback, blkcg:... |
1082 1083 1084 1085 |
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... |
1086 |
|
e3a2b3f93 blk-mq: allow cha... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 |
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; } |
da8303c63 block: make get_r... |
1105 |
/** |
a06e05e6a block: refactor g... |
1106 |
* __get_request - get a free request |
5b788ce3e block: prepare fo... |
1107 |
* @rl: request list to allocate from |
ef295ecf0 block: better op ... |
1108 |
* @op: operation and flags |
da8303c63 block: make get_r... |
1109 1110 1111 1112 1113 1114 |
* @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... |
1115 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1116 1117 |
* 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 |
1118 |
*/ |
ef295ecf0 block: better op ... |
1119 1120 |
static struct request *__get_request(struct request_list *rl, unsigned int op, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1121 |
{ |
5b788ce3e block: prepare fo... |
1122 |
struct request_queue *q = rl->q; |
b679281a6 block: restructur... |
1123 |
struct request *rq; |
7f4b35d15 block: allocate i... |
1124 1125 |
struct elevator_type *et = q->elevator->type; struct io_context *ioc = rq_ioc(bio); |
f1f8cc946 block, cfq: move ... |
1126 |
struct io_cq *icq = NULL; |
ef295ecf0 block: better op ... |
1127 |
const bool is_sync = op_is_sync(op); |
75eb6c372 block: pass aroun... |
1128 |
int may_queue; |
e80640213 block: split out ... |
1129 |
req_flags_t rq_flags = RQF_ALLOCED; |
88ee5ef15 [BLOCK] ll_rw_blk... |
1130 |
|
2fff8a924 block: Check lock... |
1131 |
lockdep_assert_held(q->queue_lock); |
3f3299d5c block: Rename que... |
1132 |
if (unlikely(blk_queue_dying(q))) |
a492f0754 block,scsi: fixup... |
1133 |
return ERR_PTR(-ENODEV); |
da8303c63 block: make get_r... |
1134 |
|
ef295ecf0 block: better op ... |
1135 |
may_queue = elv_may_queue(q, op); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1136 1137 |
if (may_queue == ELV_MQUEUE_NO) goto rq_starved; |
1faa16d22 block: change the... |
1138 1139 |
if (rl->count[is_sync]+1 >= queue_congestion_on_threshold(q)) { if (rl->count[is_sync]+1 >= q->nr_requests) { |
f2dbd76a0 block, cfq: repla... |
1140 |
/* |
88ee5ef15 [BLOCK] ll_rw_blk... |
1141 1142 1143 1144 1145 |
* 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... |
1146 |
if (!blk_rl_full(rl, is_sync)) { |
88ee5ef15 [BLOCK] ll_rw_blk... |
1147 |
ioc_set_batching(q, ioc); |
5b788ce3e block: prepare fo... |
1148 |
blk_set_rl_full(rl, is_sync); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1149 1150 1151 1152 1153 1154 1155 1156 |
} 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... |
1157 |
return ERR_PTR(-ENOMEM); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1158 1159 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1160 |
} |
d40f75a06 writeback, blkcg:... |
1161 |
blk_set_congested(rl, is_sync); |
1da177e4c Linux-2.6.12-rc2 |
1162 |
} |
082cf69eb [PATCH] ll_rw_blk... |
1163 1164 1165 1166 1167 |
/* * 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... |
1168 |
if (rl->count[is_sync] >= (3 * q->nr_requests / 2)) |
a492f0754 block,scsi: fixup... |
1169 |
return ERR_PTR(-ENOMEM); |
fd782a4a9 [PATCH] Fix get_r... |
1170 |
|
8a5ecdd42 block: add q->nr_... |
1171 |
q->nr_rqs[is_sync]++; |
1faa16d22 block: change the... |
1172 1173 |
rl->count[is_sync]++; rl->starved[is_sync] = 0; |
cb98fc8bb [BLOCK] Reimpleme... |
1174 |
|
f1f8cc946 block, cfq: move ... |
1175 1176 |
/* * Decide whether the new request will be managed by elevator. If |
e80640213 block: split out ... |
1177 |
* so, mark @rq_flags and increment elvpriv. Non-zero elvpriv will |
f1f8cc946 block, cfq: move ... |
1178 1179 1180 1181 |
* 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. * |
e6f7f93d5 block: fix elevat... |
1182 1183 1184 |
* Flush requests do not use the elevator so skip initialization. * This allows a request to share the flush and elevator data. * |
f1f8cc946 block, cfq: move ... |
1185 1186 1187 |
* Also, lookup icq while holding queue_lock. If it doesn't exist, * it will be created after releasing queue_lock. */ |
e6f7f93d5 block: fix elevat... |
1188 |
if (!op_is_flush(op) && !blk_queue_bypass(q)) { |
e80640213 block: split out ... |
1189 |
rq_flags |= RQF_ELVPRIV; |
8a5ecdd42 block: add q->nr_... |
1190 |
q->nr_rqs_elvpriv++; |
f1f8cc946 block, cfq: move ... |
1191 1192 |
if (et->icq_cache && ioc) icq = ioc_lookup_icq(ioc, q); |
9d5a4e946 block: skip eleva... |
1193 |
} |
cb98fc8bb [BLOCK] Reimpleme... |
1194 |
|
f253b86b4 Revert "block: fi... |
1195 |
if (blk_queue_io_stat(q)) |
e80640213 block: split out ... |
1196 |
rq_flags |= RQF_IO_STAT; |
1da177e4c Linux-2.6.12-rc2 |
1197 |
spin_unlock_irq(q->queue_lock); |
29e2b09ab block: collapse b... |
1198 |
/* allocate and init request */ |
5b788ce3e block: prepare fo... |
1199 |
rq = mempool_alloc(rl->rq_pool, gfp_mask); |
29e2b09ab block: collapse b... |
1200 |
if (!rq) |
b679281a6 block: restructur... |
1201 |
goto fail_alloc; |
1da177e4c Linux-2.6.12-rc2 |
1202 |
|
29e2b09ab block: collapse b... |
1203 |
blk_rq_init(q, rq); |
a051661ca blkcg: implement ... |
1204 |
blk_rq_set_rl(rq, rl); |
ef295ecf0 block: better op ... |
1205 |
rq->cmd_flags = op; |
e80640213 block: split out ... |
1206 |
rq->rq_flags = rq_flags; |
29e2b09ab block: collapse b... |
1207 |
|
aaf7c6806 block: fix elvpri... |
1208 |
/* init elvpriv */ |
e80640213 block: split out ... |
1209 |
if (rq_flags & RQF_ELVPRIV) { |
aaf7c6806 block: fix elvpri... |
1210 |
if (unlikely(et->icq_cache && !icq)) { |
7f4b35d15 block: allocate i... |
1211 1212 |
if (ioc) icq = ioc_create_icq(ioc, q, gfp_mask); |
aaf7c6806 block: fix elvpri... |
1213 1214 |
if (!icq) goto fail_elvpriv; |
29e2b09ab block: collapse b... |
1215 |
} |
aaf7c6806 block: fix elvpri... |
1216 1217 1218 1219 1220 1221 |
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... |
1222 1223 1224 |
if (icq) get_io_context(icq->ioc); } |
aaf7c6806 block: fix elvpri... |
1225 |
out: |
88ee5ef15 [BLOCK] ll_rw_blk... |
1226 1227 1228 1229 1230 1231 |
/* * 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 |
1232 1233 |
if (ioc_batching(q, ioc)) ioc->nr_batch_requests--; |
6728cb0e6 block: make core ... |
1234 |
|
e6a40b096 block: prepare re... |
1235 |
trace_block_getrq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1236 |
return rq; |
b679281a6 block: restructur... |
1237 |
|
aaf7c6806 block: fix elvpri... |
1238 1239 1240 1241 1242 1243 1244 |
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... |
1245 1246 |
printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed ", |
dc3b17cc8 block: Use pointe... |
1247 |
__func__, dev_name(q->backing_dev_info->dev)); |
aaf7c6806 block: fix elvpri... |
1248 |
|
e80640213 block: split out ... |
1249 |
rq->rq_flags &= ~RQF_ELVPRIV; |
aaf7c6806 block: fix elvpri... |
1250 1251 1252 |
rq->elv.icq = NULL; spin_lock_irq(q->queue_lock); |
8a5ecdd42 block: add q->nr_... |
1253 |
q->nr_rqs_elvpriv--; |
aaf7c6806 block: fix elvpri... |
1254 1255 |
spin_unlock_irq(q->queue_lock); goto out; |
b679281a6 block: restructur... |
1256 1257 1258 1259 1260 1261 1262 1263 1264 |
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); |
e80640213 block: split out ... |
1265 |
freed_request(rl, is_sync, rq_flags); |
b679281a6 block: restructur... |
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 |
/* * 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... |
1277 |
return ERR_PTR(-ENOMEM); |
1da177e4c Linux-2.6.12-rc2 |
1278 |
} |
da8303c63 block: make get_r... |
1279 |
/** |
a06e05e6a block: refactor g... |
1280 |
* get_request - get a free request |
da8303c63 block: make get_r... |
1281 |
* @q: request_queue to allocate request from |
ef295ecf0 block: better op ... |
1282 |
* @op: operation and flags |
da8303c63 block: make get_r... |
1283 |
* @bio: bio to allocate request for (can be %NULL) |
a06e05e6a block: refactor g... |
1284 |
* @gfp_mask: allocation mask |
da8303c63 block: make get_r... |
1285 |
* |
d0164adc8 mm, page_alloc: d... |
1286 1287 |
* 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... |
1288 |
* |
da3dae54e Documentation: Do... |
1289 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1290 1291 |
* 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 |
1292 |
*/ |
ef295ecf0 block: better op ... |
1293 1294 |
static struct request *get_request(struct request_queue *q, unsigned int op, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1295 |
{ |
ef295ecf0 block: better op ... |
1296 |
const bool is_sync = op_is_sync(op); |
a06e05e6a block: refactor g... |
1297 |
DEFINE_WAIT(wait); |
a051661ca blkcg: implement ... |
1298 |
struct request_list *rl; |
1da177e4c Linux-2.6.12-rc2 |
1299 |
struct request *rq; |
a051661ca blkcg: implement ... |
1300 |
|
2fff8a924 block: Check lock... |
1301 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
1302 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
1303 |
|
a051661ca blkcg: implement ... |
1304 |
rl = blk_get_rl(q, bio); /* transferred to @rq on success */ |
a06e05e6a block: refactor g... |
1305 |
retry: |
ef295ecf0 block: better op ... |
1306 |
rq = __get_request(rl, op, bio, gfp_mask); |
a492f0754 block,scsi: fixup... |
1307 |
if (!IS_ERR(rq)) |
a06e05e6a block: refactor g... |
1308 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
1309 |
|
03a07c92a block: return on ... |
1310 1311 1312 1313 |
if (op & REQ_NOWAIT) { blk_put_rl(rl); return ERR_PTR(-EAGAIN); } |
d0164adc8 mm, page_alloc: d... |
1314 |
if (!gfpflags_allow_blocking(gfp_mask) || unlikely(blk_queue_dying(q))) { |
a051661ca blkcg: implement ... |
1315 |
blk_put_rl(rl); |
a492f0754 block,scsi: fixup... |
1316 |
return rq; |
a051661ca blkcg: implement ... |
1317 |
} |
1da177e4c Linux-2.6.12-rc2 |
1318 |
|
a06e05e6a block: refactor g... |
1319 1320 1321 |
/* wait on @rl and retry */ prepare_to_wait_exclusive(&rl->wait[is_sync], &wait, TASK_UNINTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1322 |
|
e6a40b096 block: prepare re... |
1323 |
trace_block_sleeprq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1324 |
|
a06e05e6a block: refactor g... |
1325 1326 |
spin_unlock_irq(q->queue_lock); io_schedule(); |
d6344532a [PATCH] blk: redu... |
1327 |
|
a06e05e6a block: refactor g... |
1328 1329 1330 1331 1332 |
/* * 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... |
1333 |
ioc_set_batching(q, current->io_context); |
05caf8dbc block: Move the s... |
1334 |
|
a06e05e6a block: refactor g... |
1335 1336 |
spin_lock_irq(q->queue_lock); finish_wait(&rl->wait[is_sync], &wait); |
1da177e4c Linux-2.6.12-rc2 |
1337 |
|
a06e05e6a block: refactor g... |
1338 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1339 |
} |
cd6ce1482 block: Make reque... |
1340 1341 |
static struct request *blk_old_get_request(struct request_queue *q, unsigned int op, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 |
{ struct request *rq; |
332ebbf7f block: Document w... |
1344 |
WARN_ON_ONCE(q->mq_ops); |
7f4b35d15 block: allocate i... |
1345 1346 |
/* create ioc upfront */ create_io_context(gfp_mask, q->node); |
d6344532a [PATCH] blk: redu... |
1347 |
spin_lock_irq(q->queue_lock); |
cd6ce1482 block: Make reque... |
1348 |
rq = get_request(q, op, NULL, gfp_mask); |
0c4de0f33 block: ensure bio... |
1349 |
if (IS_ERR(rq)) { |
da8303c63 block: make get_r... |
1350 |
spin_unlock_irq(q->queue_lock); |
0c4de0f33 block: ensure bio... |
1351 1352 |
return rq; } |
1da177e4c Linux-2.6.12-rc2 |
1353 |
|
0c4de0f33 block: ensure bio... |
1354 1355 1356 1357 |
/* 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 |
1358 1359 |
return rq; } |
320ae51fe blk-mq: new multi... |
1360 |
|
cd6ce1482 block: Make reque... |
1361 1362 |
struct request *blk_get_request(struct request_queue *q, unsigned int op, gfp_t gfp_mask) |
320ae51fe blk-mq: new multi... |
1363 |
{ |
d280bab30 block: Introduce ... |
1364 1365 1366 1367 |
struct request *req; if (q->mq_ops) { req = blk_mq_alloc_request(q, op, |
6f3b0e8bc blk-mq: add a fla... |
1368 1369 |
(gfp_mask & __GFP_DIRECT_RECLAIM) ? 0 : BLK_MQ_REQ_NOWAIT); |
d280bab30 block: Introduce ... |
1370 1371 1372 1373 1374 1375 1376 1377 1378 |
if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn) q->mq_ops->initialize_rq_fn(req); } else { req = blk_old_get_request(q, op, gfp_mask); if (!IS_ERR(req) && q->initialize_rq_fn) q->initialize_rq_fn(req); } return req; |
320ae51fe blk-mq: new multi... |
1379 |
} |
1da177e4c Linux-2.6.12-rc2 |
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 |
EXPORT_SYMBOL(blk_get_request); /** * blk_requeue_request - put a request back on queue * @q: request queue where request should be inserted * @rq: request to be inserted * * Description: * Drivers often keep queueing requests until the hardware cannot accept * more, when that condition happens we need to put the request back * on the queue. Must be called with queue lock held. */ |
165125e1e [BLOCK] Get rid o... |
1392 |
void blk_requeue_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1393 |
{ |
2fff8a924 block: Check lock... |
1394 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
1395 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
1396 |
|
242f9dcb8 block: unify requ... |
1397 1398 |
blk_delete_timer(rq); blk_clear_rq_complete(rq); |
5f3ea37c7 blktrace: port to... |
1399 |
trace_block_rq_requeue(q, rq); |
87760e5ee block: hook up wr... |
1400 |
wbt_requeue(q->rq_wb, &rq->issue_stat); |
2056a782f [PATCH] Block que... |
1401 |
|
e80640213 block: split out ... |
1402 |
if (rq->rq_flags & RQF_QUEUED) |
1da177e4c Linux-2.6.12-rc2 |
1403 |
blk_queue_end_tag(q, rq); |
ba396a6c1 block: fix oops w... |
1404 |
BUG_ON(blk_queued_rq(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1405 1406 |
elv_requeue_request(q, rq); } |
1da177e4c Linux-2.6.12-rc2 |
1407 |
EXPORT_SYMBOL(blk_requeue_request); |
73c101011 block: initial pa... |
1408 1409 1410 |
static void add_acct_request(struct request_queue *q, struct request *rq, int where) { |
320ae51fe blk-mq: new multi... |
1411 |
blk_account_io_start(rq, true); |
7eaceacca block: remove per... |
1412 |
__elv_add_request(q, rq, where); |
73c101011 block: initial pa... |
1413 |
} |
d62e26b3f block: pass in qu... |
1414 |
static void part_round_stats_single(struct request_queue *q, int cpu, |
b8d62b3a9 blk-mq: enable ch... |
1415 1416 |
struct hd_struct *part, unsigned long now, unsigned int inflight) |
074a7aca7 block: move stats... |
1417 |
{ |
b8d62b3a9 blk-mq: enable ch... |
1418 |
if (inflight) { |
074a7aca7 block: move stats... |
1419 |
__part_stat_add(cpu, part, time_in_queue, |
b8d62b3a9 blk-mq: enable ch... |
1420 |
inflight * (now - part->stamp)); |
074a7aca7 block: move stats... |
1421 1422 1423 1424 1425 1426 |
__part_stat_add(cpu, part, io_ticks, (now - part->stamp)); } part->stamp = now; } /** |
496aa8a98 block: fix curren... |
1427 |
* part_round_stats() - Round off the performance stats on a struct disk_stats. |
d62e26b3f block: pass in qu... |
1428 |
* @q: target block queue |
496aa8a98 block: fix curren... |
1429 1430 |
* @cpu: cpu number for stats access * @part: target partition |
1da177e4c Linux-2.6.12-rc2 |
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 |
* * 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. */ |
d62e26b3f block: pass in qu... |
1443 |
void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part) |
6f2576af5 Enhanced partitio... |
1444 |
{ |
b8d62b3a9 blk-mq: enable ch... |
1445 |
struct hd_struct *part2 = NULL; |
6f2576af5 Enhanced partitio... |
1446 |
unsigned long now = jiffies; |
b8d62b3a9 blk-mq: enable ch... |
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 |
unsigned int inflight[2]; int stats = 0; if (part->stamp != now) stats |= 1; if (part->partno) { part2 = &part_to_disk(part)->part0; if (part2->stamp != now) stats |= 2; } if (!stats) return; part_in_flight(q, part, inflight); |
6f2576af5 Enhanced partitio... |
1463 |
|
b8d62b3a9 blk-mq: enable ch... |
1464 1465 1466 1467 |
if (stats & 2) part_round_stats_single(q, cpu, part2, now, inflight[1]); if (stats & 1) part_round_stats_single(q, cpu, part, now, inflight[0]); |
6f2576af5 Enhanced partitio... |
1468 |
} |
074a7aca7 block: move stats... |
1469 |
EXPORT_SYMBOL_GPL(part_round_stats); |
6f2576af5 Enhanced partitio... |
1470 |
|
47fafbc70 block / PM: Repla... |
1471 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
1472 1473 |
static void blk_pm_put_request(struct request *rq) { |
e80640213 block: split out ... |
1474 |
if (rq->q->dev && !(rq->rq_flags & RQF_PM) && !--rq->q->nr_pending) |
c8158819d block: implement ... |
1475 1476 1477 1478 1479 |
pm_runtime_mark_last_busy(rq->q->dev); } #else static inline void blk_pm_put_request(struct request *rq) {} #endif |
165125e1e [BLOCK] Get rid o... |
1480 |
void __blk_put_request(struct request_queue *q, struct request *req) |
1da177e4c Linux-2.6.12-rc2 |
1481 |
{ |
e80640213 block: split out ... |
1482 |
req_flags_t rq_flags = req->rq_flags; |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 |
if (unlikely(!q)) return; |
1da177e4c Linux-2.6.12-rc2 |
1485 |
|
6f5ba581c blk-mq: divert __... |
1486 1487 1488 1489 |
if (q->mq_ops) { blk_mq_free_request(req); return; } |
2fff8a924 block: Check lock... |
1490 |
lockdep_assert_held(q->queue_lock); |
c8158819d block: implement ... |
1491 |
blk_pm_put_request(req); |
8922e16cf [PATCH] 01/05 Imp... |
1492 |
elv_completed_request(q, req); |
1cd96c242 block: WARN in __... |
1493 1494 |
/* this is a bio leak */ WARN_ON(req->bio != NULL); |
87760e5ee block: hook up wr... |
1495 |
wbt_done(q->rq_wb, &req->issue_stat); |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 1498 1499 |
/* * Request may not have originated from ll_rw_blk. if not, * it didn't come out of our reserved rq pools */ |
e80640213 block: split out ... |
1500 |
if (rq_flags & RQF_ALLOCED) { |
a051661ca blkcg: implement ... |
1501 |
struct request_list *rl = blk_rq_rl(req); |
ef295ecf0 block: better op ... |
1502 |
bool sync = op_is_sync(req->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
1503 |
|
1da177e4c Linux-2.6.12-rc2 |
1504 |
BUG_ON(!list_empty(&req->queuelist)); |
360f92c24 block: fix regres... |
1505 |
BUG_ON(ELV_ON_HASH(req)); |
1da177e4c Linux-2.6.12-rc2 |
1506 |
|
a051661ca blkcg: implement ... |
1507 |
blk_free_request(rl, req); |
e80640213 block: split out ... |
1508 |
freed_request(rl, sync, rq_flags); |
a051661ca blkcg: implement ... |
1509 |
blk_put_rl(rl); |
1da177e4c Linux-2.6.12-rc2 |
1510 1511 |
} } |
6e39b69e7 [SCSI] export blk... |
1512 |
EXPORT_SYMBOL_GPL(__blk_put_request); |
1da177e4c Linux-2.6.12-rc2 |
1513 1514 |
void blk_put_request(struct request *req) { |
165125e1e [BLOCK] Get rid o... |
1515 |
struct request_queue *q = req->q; |
8922e16cf [PATCH] 01/05 Imp... |
1516 |
|
320ae51fe blk-mq: new multi... |
1517 1518 1519 1520 1521 1522 1523 1524 1525 |
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 |
1526 |
} |
1da177e4c Linux-2.6.12-rc2 |
1527 |
EXPORT_SYMBOL(blk_put_request); |
320ae51fe blk-mq: new multi... |
1528 1529 |
bool bio_attempt_back_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1530 |
{ |
1eff9d322 block: rename bio... |
1531 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1532 |
|
73c101011 block: initial pa... |
1533 1534 |
if (!ll_back_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1535 |
trace_block_bio_backmerge(q, req, bio); |
73c101011 block: initial pa... |
1536 1537 1538 1539 1540 1541 |
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... |
1542 |
req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1543 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1544 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1545 1546 |
return true; } |
320ae51fe blk-mq: new multi... |
1547 1548 |
bool bio_attempt_front_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1549 |
{ |
1eff9d322 block: rename bio... |
1550 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1551 |
|
73c101011 block: initial pa... |
1552 1553 |
if (!ll_front_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1554 |
trace_block_bio_frontmerge(q, req, bio); |
73c101011 block: initial pa... |
1555 1556 1557 |
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); |
73c101011 block: initial pa... |
1558 1559 |
bio->bi_next = req->bio; req->bio = bio; |
4f024f379 block: Abstract o... |
1560 1561 |
req->__sector = bio->bi_iter.bi_sector; req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1562 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1563 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1564 1565 |
return true; } |
1e739730c block: optionally... |
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 |
bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, struct bio *bio) { unsigned short segments = blk_rq_nr_discard_segments(req); if (segments >= queue_max_discard_segments(q)) goto no_merge; if (blk_rq_sectors(req) + bio_sectors(bio) > blk_rq_get_max_sectors(req, blk_rq_pos(req))) goto no_merge; req->biotail->bi_next = bio; req->biotail = bio; req->__data_len += bio->bi_iter.bi_size; req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); req->nr_phys_segments = segments + 1; blk_account_io_start(req, false); return true; no_merge: req_set_nomerge(q, req); return false; } |
bd87b5898 block: drop @tsk ... |
1589 |
/** |
320ae51fe blk-mq: new multi... |
1590 |
* blk_attempt_plug_merge - try to merge with %current's plugged list |
bd87b5898 block: drop @tsk ... |
1591 1592 1593 |
* @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... |
1594 1595 1596 |
* @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 ... |
1597 1598 1599 1600 1601 |
* * 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... |
1602 1603 1604 1605 1606 1607 |
* 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... |
1608 1609 |
* * Caller must ensure !blk_queue_nomerges(q) beforehand. |
73c101011 block: initial pa... |
1610 |
*/ |
320ae51fe blk-mq: new multi... |
1611 |
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
5b3f341f0 blk-mq: make plug... |
1612 1613 |
unsigned int *request_count, struct request **same_queue_rq) |
73c101011 block: initial pa... |
1614 1615 1616 |
{ struct blk_plug *plug; struct request *rq; |
92f399c72 blk-mq: mq plug l... |
1617 |
struct list_head *plug_list; |
73c101011 block: initial pa... |
1618 |
|
bd87b5898 block: drop @tsk ... |
1619 |
plug = current->plug; |
73c101011 block: initial pa... |
1620 |
if (!plug) |
34fe7c054 block: enumify EL... |
1621 |
return false; |
56ebdaf2f block: simplify f... |
1622 |
*request_count = 0; |
73c101011 block: initial pa... |
1623 |
|
92f399c72 blk-mq: mq plug l... |
1624 1625 1626 1627 1628 1629 |
if (q->mq_ops) plug_list = &plug->mq_list; else plug_list = &plug->list; list_for_each_entry_reverse(rq, plug_list, queuelist) { |
34fe7c054 block: enumify EL... |
1630 |
bool merged = false; |
73c101011 block: initial pa... |
1631 |
|
5b3f341f0 blk-mq: make plug... |
1632 |
if (rq->q == q) { |
1b2e19f17 block: make auto ... |
1633 |
(*request_count)++; |
5b3f341f0 blk-mq: make plug... |
1634 1635 1636 1637 1638 1639 1640 1641 |
/* * 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... |
1642 |
|
07c2bd373 block: don't call... |
1643 |
if (rq->q != q || !blk_rq_merge_ok(rq, bio)) |
73c101011 block: initial pa... |
1644 |
continue; |
34fe7c054 block: enumify EL... |
1645 1646 1647 1648 1649 1650 1651 |
switch (blk_try_merge(rq, bio)) { case ELEVATOR_BACK_MERGE: merged = bio_attempt_back_merge(q, rq, bio); break; case ELEVATOR_FRONT_MERGE: merged = bio_attempt_front_merge(q, rq, bio); break; |
1e739730c block: optionally... |
1652 1653 1654 |
case ELEVATOR_DISCARD_MERGE: merged = bio_attempt_discard_merge(q, rq, bio); break; |
34fe7c054 block: enumify EL... |
1655 1656 |
default: break; |
73c101011 block: initial pa... |
1657 |
} |
34fe7c054 block: enumify EL... |
1658 1659 1660 |
if (merged) return true; |
73c101011 block: initial pa... |
1661 |
} |
34fe7c054 block: enumify EL... |
1662 1663 |
return false; |
73c101011 block: initial pa... |
1664 |
} |
0809e3ac6 block: fix plug l... |
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 |
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; } |
da8d7f079 block: Export blk... |
1688 |
void blk_init_request_from_bio(struct request *req, struct bio *bio) |
52d9e6753 [BLOCK] ll_rw_blk... |
1689 |
{ |
0be0dee64 block: Inline blk... |
1690 |
struct io_context *ioc = rq_ioc(bio); |
1eff9d322 block: rename bio... |
1691 |
if (bio->bi_opf & REQ_RAHEAD) |
a82afdfcb block: use the sa... |
1692 |
req->cmd_flags |= REQ_FAILFAST_MASK; |
b31dc66a5 [PATCH] Kill PF_S... |
1693 |
|
4f024f379 block: Abstract o... |
1694 |
req->__sector = bio->bi_iter.bi_sector; |
5dc8b362a block: Add iocont... |
1695 1696 |
if (ioprio_valid(bio_prio(bio))) req->ioprio = bio_prio(bio); |
0be0dee64 block: Inline blk... |
1697 1698 1699 1700 |
else if (ioc) req->ioprio = ioc->ioprio; else req->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); |
cb6934f8e block: add suppor... |
1701 |
req->write_hint = bio->bi_write_hint; |
bc1c56fde Share code betwee... |
1702 |
blk_rq_bio_prep(req->q, req, bio); |
52d9e6753 [BLOCK] ll_rw_blk... |
1703 |
} |
da8d7f079 block: Export blk... |
1704 |
EXPORT_SYMBOL_GPL(blk_init_request_from_bio); |
52d9e6753 [BLOCK] ll_rw_blk... |
1705 |
|
dece16353 block: change ->m... |
1706 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1707 |
{ |
73c101011 block: initial pa... |
1708 |
struct blk_plug *plug; |
34fe7c054 block: enumify EL... |
1709 |
int where = ELEVATOR_INSERT_SORT; |
e4d750c97 block: free merge... |
1710 |
struct request *req, *free; |
56ebdaf2f block: simplify f... |
1711 |
unsigned int request_count = 0; |
87760e5ee block: hook up wr... |
1712 |
unsigned int wb_acct; |
1da177e4c Linux-2.6.12-rc2 |
1713 |
|
1da177e4c Linux-2.6.12-rc2 |
1714 1715 1716 1717 1718 1719 |
/* * 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); |
af67c31fb blk: remove bio_s... |
1720 |
blk_queue_split(q, &bio); |
23688bf4f block: ensure to ... |
1721 |
|
e23947bd7 bio-integrity: fo... |
1722 |
if (!bio_integrity_prep(bio)) |
dece16353 block: change ->m... |
1723 |
return BLK_QC_T_NONE; |
ffecfd1a7 block: optionally... |
1724 |
|
f73f44eb0 block: add a op_i... |
1725 |
if (op_is_flush(bio->bi_opf)) { |
73c101011 block: initial pa... |
1726 |
spin_lock_irq(q->queue_lock); |
ae1b15396 block: reimplemen... |
1727 |
where = ELEVATOR_INSERT_FLUSH; |
28e7d1845 block: drop barri... |
1728 1729 |
goto get_rq; } |
73c101011 block: initial pa... |
1730 1731 1732 1733 |
/* * Check if we can merge with the plugged list before grabbing * any locks. */ |
0809e3ac6 block: fix plug l... |
1734 1735 |
if (!blk_queue_nomerges(q)) { if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) |
dece16353 block: change ->m... |
1736 |
return BLK_QC_T_NONE; |
0809e3ac6 block: fix plug l... |
1737 1738 |
} else request_count = blk_plug_queued_count(q); |
1da177e4c Linux-2.6.12-rc2 |
1739 |
|
73c101011 block: initial pa... |
1740 |
spin_lock_irq(q->queue_lock); |
2056a782f [PATCH] Block que... |
1741 |
|
34fe7c054 block: enumify EL... |
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 |
switch (elv_merge(q, &req, bio)) { case ELEVATOR_BACK_MERGE: if (!bio_attempt_back_merge(q, req, bio)) break; elv_bio_merged(q, req, bio); free = attempt_back_merge(q, req); if (free) __blk_put_request(q, free); else elv_merged_request(q, req, ELEVATOR_BACK_MERGE); goto out_unlock; case ELEVATOR_FRONT_MERGE: if (!bio_attempt_front_merge(q, req, bio)) break; elv_bio_merged(q, req, bio); free = attempt_front_merge(q, req); if (free) __blk_put_request(q, free); else elv_merged_request(q, req, ELEVATOR_FRONT_MERGE); goto out_unlock; default: break; |
1da177e4c Linux-2.6.12-rc2 |
1765 |
} |
450991bc1 [PATCH] blk: __ma... |
1766 |
get_rq: |
87760e5ee block: hook up wr... |
1767 |
wb_acct = wbt_wait(q->rq_wb, bio, q->queue_lock); |
1da177e4c Linux-2.6.12-rc2 |
1768 |
/* |
450991bc1 [PATCH] blk: __ma... |
1769 |
* Grab a free request. This is might sleep but can not fail. |
d6344532a [PATCH] blk: redu... |
1770 |
* Returns with the queue unlocked. |
450991bc1 [PATCH] blk: __ma... |
1771 |
*/ |
ef295ecf0 block: better op ... |
1772 |
req = get_request(q, bio->bi_opf, bio, GFP_NOIO); |
a492f0754 block,scsi: fixup... |
1773 |
if (IS_ERR(req)) { |
87760e5ee block: hook up wr... |
1774 |
__wbt_done(q->rq_wb, wb_acct); |
4e4cbee93 block: switch bio... |
1775 1776 1777 1778 |
if (PTR_ERR(req) == -ENOMEM) bio->bi_status = BLK_STS_RESOURCE; else bio->bi_status = BLK_STS_IOERR; |
4246a0b63 block: add a bi_e... |
1779 |
bio_endio(bio); |
da8303c63 block: make get_r... |
1780 1781 |
goto out_unlock; } |
d6344532a [PATCH] blk: redu... |
1782 |
|
87760e5ee block: hook up wr... |
1783 |
wbt_track(&req->issue_stat, wb_acct); |
450991bc1 [PATCH] blk: __ma... |
1784 1785 1786 1787 1788 |
/* * 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 |
1789 |
*/ |
da8d7f079 block: Export blk... |
1790 |
blk_init_request_from_bio(req, bio); |
1da177e4c Linux-2.6.12-rc2 |
1791 |
|
9562ad9ab block: Remove the... |
1792 |
if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) |
11ccf116d block: fix warnin... |
1793 |
req->cpu = raw_smp_processor_id(); |
73c101011 block: initial pa... |
1794 1795 |
plug = current->plug; |
721a9602e block: kill off R... |
1796 |
if (plug) { |
dc6d36c97 block: readd plug... |
1797 1798 |
/* * If this is the first request added after a plug, fire |
7aef2e780 block: trace all ... |
1799 |
* of a plug trace. |
0a6219a95 block: deal with ... |
1800 1801 1802 |
* * @request_count may become stale because of schedule * out, so check plug list again. |
dc6d36c97 block: readd plug... |
1803 |
*/ |
0a6219a95 block: deal with ... |
1804 |
if (!request_count || list_empty(&plug->list)) |
dc6d36c97 block: readd plug... |
1805 |
trace_block_plug(q); |
3540d5e89 block: avoid unne... |
1806 |
else { |
50d24c344 block: immediatel... |
1807 1808 1809 |
struct request *last = list_entry_rq(plug->list.prev); if (request_count >= BLK_MAX_REQUEST_COUNT || blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE) { |
3540d5e89 block: avoid unne... |
1810 |
blk_flush_plug_list(plug, false); |
019ceb7d5 block: add missed... |
1811 1812 |
trace_block_plug(q); } |
73c101011 block: initial pa... |
1813 |
} |
73c101011 block: initial pa... |
1814 |
list_add_tail(&req->queuelist, &plug->list); |
320ae51fe blk-mq: new multi... |
1815 |
blk_account_io_start(req, true); |
73c101011 block: initial pa... |
1816 1817 1818 |
} else { spin_lock_irq(q->queue_lock); add_acct_request(q, req, where); |
24ecfbe27 block: add blk_ru... |
1819 |
__blk_run_queue(q); |
73c101011 block: initial pa... |
1820 1821 1822 |
out_unlock: spin_unlock_irq(q->queue_lock); } |
dece16353 block: change ->m... |
1823 1824 |
return BLK_QC_T_NONE; |
1da177e4c Linux-2.6.12-rc2 |
1825 |
} |
c3a8759ec block: bio_check_... |
1826 |
static void handle_bad_sector(struct bio *bio, sector_t maxsector) |
1da177e4c Linux-2.6.12-rc2 |
1827 1828 1829 1830 1831 |
{ char b[BDEVNAME_SIZE]; printk(KERN_INFO "attempt to access beyond end of device "); |
6296b9604 block, drivers, f... |
1832 1833 |
printk(KERN_INFO "%s: rw=%d, want=%Lu, limit=%Lu ", |
74d46992e block: replace bi... |
1834 |
bio_devname(bio, b), bio->bi_opf, |
f73a1c7d1 block: Add bio_en... |
1835 |
(unsigned long long)bio_end_sector(bio), |
c3a8759ec block: bio_check_... |
1836 |
(long long)maxsector); |
1da177e4c Linux-2.6.12-rc2 |
1837 |
} |
c17bb4951 [PATCH] fault-inj... |
1838 1839 1840 1841 1842 1843 1844 1845 1846 |
#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... |
1847 |
static bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
1848 |
{ |
b2c9cd379 fail_make_request... |
1849 |
return part->make_it_fail && should_fail(&fail_make_request, bytes); |
c17bb4951 [PATCH] fault-inj... |
1850 1851 1852 1853 |
} static int __init fail_make_request_debugfs(void) { |
dd48c085c fault-injection: ... |
1854 1855 |
struct dentry *dir = fault_create_debugfs_attr("fail_make_request", NULL, &fail_make_request); |
21f9fcd81 block: replace IS... |
1856 |
return PTR_ERR_OR_ZERO(dir); |
c17bb4951 [PATCH] fault-inj... |
1857 1858 1859 1860 1861 |
} late_initcall(fail_make_request_debugfs); #else /* CONFIG_FAIL_MAKE_REQUEST */ |
b2c9cd379 fail_make_request... |
1862 1863 |
static inline bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
1864 |
{ |
b2c9cd379 fail_make_request... |
1865 |
return false; |
c17bb4951 [PATCH] fault-inj... |
1866 1867 1868 |
} #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
b4fb3baf3 block: fail op_is... |
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 |
static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) { if (part->policy && op_is_write(bio_op(bio))) { char b[BDEVNAME_SIZE]; printk(KERN_ERR "generic_make_request: Trying to write " "to read-only block-device %s (partno %d) ", bio_devname(bio, b), part->partno); return true; } return false; } |
c07e2b412 block: factor our... |
1884 |
/* |
c3a8759ec block: bio_check_... |
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 |
* Check whether this bio extends beyond the end of the device or partition. * This may well happen - the kernel calls bread() without checking the size of * the device, e.g., when mounting a file system. */ static inline int bio_check_eod(struct bio *bio, sector_t maxsector) { unsigned int nr_sectors = bio_sectors(bio); if (nr_sectors && maxsector && (nr_sectors > maxsector || bio->bi_iter.bi_sector > maxsector - nr_sectors)) { handle_bad_sector(bio, maxsector); return -EIO; } return 0; } /* |
74d46992e block: replace bi... |
1903 1904 1905 1906 1907 |
* Remap block n of partition p to block n+start(p) of the disk. */ static inline int blk_partition_remap(struct bio *bio) { struct hd_struct *p; |
c3a8759ec block: bio_check_... |
1908 |
int ret = -EIO; |
74d46992e block: replace bi... |
1909 |
|
b4fb3baf3 block: fail op_is... |
1910 1911 |
rcu_read_lock(); p = __disk_get_part(bio->bi_disk, bio->bi_partno); |
c3a8759ec block: bio_check_... |
1912 1913 1914 1915 1916 |
if (unlikely(!p)) goto out; if (unlikely(should_fail_request(p, bio->bi_iter.bi_size))) goto out; if (unlikely(bio_check_ro(bio, p))) |
b4fb3baf3 block: fail op_is... |
1917 |
goto out; |
b4fb3baf3 block: fail op_is... |
1918 |
|
74d46992e block: replace bi... |
1919 1920 1921 1922 |
/* * Zone reset does not include bi_size so bio_sectors() is always 0. * Include a test for the reset op code and perform the remap if needed. */ |
c3a8759ec block: bio_check_... |
1923 1924 1925 1926 1927 1928 1929 1930 1931 |
if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET) { if (bio_check_eod(bio, part_nr_sects_read(p))) goto out; bio->bi_iter.bi_sector += p->start_sect; bio->bi_partno = 0; trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p), bio->bi_iter.bi_sector - p->start_sect); } ret = 0; |
b4fb3baf3 block: fail op_is... |
1932 1933 |
out: rcu_read_unlock(); |
74d46992e block: replace bi... |
1934 1935 |
return ret; } |
27a84d54c block: refactor g... |
1936 1937 |
static noinline_for_stack bool generic_make_request_checks(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1938 |
{ |
165125e1e [BLOCK] Get rid o... |
1939 |
struct request_queue *q; |
5a7bbad27 block: remove sup... |
1940 |
int nr_sectors = bio_sectors(bio); |
4e4cbee93 block: switch bio... |
1941 |
blk_status_t status = BLK_STS_IOERR; |
5a7bbad27 block: remove sup... |
1942 |
char b[BDEVNAME_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
1943 1944 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
1945 |
|
74d46992e block: replace bi... |
1946 |
q = bio->bi_disk->queue; |
5a7bbad27 block: remove sup... |
1947 1948 1949 1950 1951 |
if (unlikely(!q)) { printk(KERN_ERR "generic_make_request: Trying to access " "nonexistent block-device %s (%Lu) ", |
74d46992e block: replace bi... |
1952 |
bio_devname(bio, b), (long long)bio->bi_iter.bi_sector); |
5a7bbad27 block: remove sup... |
1953 1954 |
goto end_io; } |
c17bb4951 [PATCH] fault-inj... |
1955 |
|
03a07c92a block: return on ... |
1956 1957 1958 1959 |
/* * For a REQ_NOWAIT based request, return -EOPNOTSUPP * if queue is not a request based queue. */ |
03a07c92a block: return on ... |
1960 1961 |
if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_rq_based(q)) goto not_supported; |
74d46992e block: replace bi... |
1962 |
if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) |
5a7bbad27 block: remove sup... |
1963 |
goto end_io; |
2056a782f [PATCH] Block que... |
1964 |
|
c3a8759ec block: bio_check_... |
1965 1966 |
if (bio->bi_partno) { if (unlikely(blk_partition_remap(bio))) |
b4fb3baf3 block: fail op_is... |
1967 1968 |
goto end_io; } else { |
c3a8759ec block: bio_check_... |
1969 1970 1971 |
if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0))) goto end_io; if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk)))) |
b4fb3baf3 block: fail op_is... |
1972 1973 |
goto end_io; } |
2056a782f [PATCH] Block que... |
1974 |
|
5a7bbad27 block: remove sup... |
1975 1976 1977 1978 1979 |
/* * Filter flush bio's early so that make_request based * drivers without flush support don't have to worry * about them. */ |
f3a8ab7d5 block: cleanup re... |
1980 |
if (op_is_flush(bio->bi_opf) && |
c888a8f95 block: kill off q... |
1981 |
!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) { |
1eff9d322 block: rename bio... |
1982 |
bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA); |
5a7bbad27 block: remove sup... |
1983 |
if (!nr_sectors) { |
4e4cbee93 block: switch bio... |
1984 |
status = BLK_STS_OK; |
51fd77bd9 [BLOCK] Don't all... |
1985 1986 |
goto end_io; } |
5a7bbad27 block: remove sup... |
1987 |
} |
5ddfe9691 [PATCH] md: check... |
1988 |
|
288dab8a3 block: add a sepa... |
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 |
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: |
74d46992e block: replace bi... |
1999 |
if (!q->limits.max_write_same_sectors) |
288dab8a3 block: add a sepa... |
2000 |
goto not_supported; |
58886785d block: fix uninte... |
2001 |
break; |
2d253440b block: Define zon... |
2002 2003 |
case REQ_OP_ZONE_REPORT: case REQ_OP_ZONE_RESET: |
74d46992e block: replace bi... |
2004 |
if (!blk_queue_is_zoned(q)) |
2d253440b block: Define zon... |
2005 |
goto not_supported; |
288dab8a3 block: add a sepa... |
2006 |
break; |
a6f0788ec block: add suppor... |
2007 |
case REQ_OP_WRITE_ZEROES: |
74d46992e block: replace bi... |
2008 |
if (!q->limits.max_write_zeroes_sectors) |
a6f0788ec block: add suppor... |
2009 2010 |
goto not_supported; break; |
288dab8a3 block: add a sepa... |
2011 2012 |
default: break; |
5a7bbad27 block: remove sup... |
2013 |
} |
01edede41 block: trace bio ... |
2014 |
|
7f4b35d15 block: allocate i... |
2015 2016 2017 2018 2019 2020 2021 |
/* * 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... |
2022 2023 |
if (!blkcg_bio_issue_check(q, bio)) return false; |
27a84d54c block: refactor g... |
2024 |
|
fbbaf700e block: trace comp... |
2025 2026 2027 2028 2029 2030 2031 |
if (!bio_flagged(bio, BIO_TRACE_COMPLETION)) { trace_block_bio_queue(q, bio); /* Now that enqueuing has been traced, we need to trace * completion as well. */ bio_set_flag(bio, BIO_TRACE_COMPLETION); } |
27a84d54c block: refactor g... |
2032 |
return true; |
a7384677b block: remove dup... |
2033 |
|
288dab8a3 block: add a sepa... |
2034 |
not_supported: |
4e4cbee93 block: switch bio... |
2035 |
status = BLK_STS_NOTSUPP; |
a7384677b block: remove dup... |
2036 |
end_io: |
4e4cbee93 block: switch bio... |
2037 |
bio->bi_status = status; |
4246a0b63 block: add a bi_e... |
2038 |
bio_endio(bio); |
27a84d54c block: refactor g... |
2039 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
2040 |
} |
27a84d54c block: refactor g... |
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 |
/** * 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... |
2064 |
*/ |
dece16353 block: change ->m... |
2065 |
blk_qc_t generic_make_request(struct bio *bio) |
d89d87965 When stacked bloc... |
2066 |
{ |
f5fe1b519 blk: Ensure users... |
2067 2068 2069 2070 2071 2072 2073 2074 |
/* * bio_list_on_stack[0] contains bios submitted by the current * make_request_fn. * bio_list_on_stack[1] contains bios that were submitted before * the current make_request_fn, but that haven't been processed * yet. */ struct bio_list bio_list_on_stack[2]; |
dece16353 block: change ->m... |
2075 |
blk_qc_t ret = BLK_QC_T_NONE; |
bddd87c7e blk-core: use BIO... |
2076 |
|
27a84d54c block: refactor g... |
2077 |
if (!generic_make_request_checks(bio)) |
dece16353 block: change ->m... |
2078 |
goto out; |
27a84d54c block: refactor g... |
2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 |
/* * 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... |
2090 |
if (current->bio_list) { |
f5fe1b519 blk: Ensure users... |
2091 |
bio_list_add(¤t->bio_list[0], bio); |
dece16353 block: change ->m... |
2092 |
goto out; |
d89d87965 When stacked bloc... |
2093 |
} |
27a84d54c block: refactor g... |
2094 |
|
d89d87965 When stacked bloc... |
2095 2096 2097 2098 2099 |
/* 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... |
2100 2101 |
* 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... |
2102 |
* added. ->make_request() may indeed add some more bios |
d89d87965 When stacked bloc... |
2103 2104 2105 |
* 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... |
2106 |
* of the top of the list (no pretending) and so remove it from |
27a84d54c block: refactor g... |
2107 |
* bio_list, and call into ->make_request() again. |
d89d87965 When stacked bloc... |
2108 2109 |
*/ BUG_ON(bio->bi_next); |
f5fe1b519 blk: Ensure users... |
2110 2111 |
bio_list_init(&bio_list_on_stack[0]); current->bio_list = bio_list_on_stack; |
d89d87965 When stacked bloc... |
2112 |
do { |
74d46992e block: replace bi... |
2113 |
struct request_queue *q = bio->bi_disk->queue; |
27a84d54c block: refactor g... |
2114 |
|
03a07c92a block: return on ... |
2115 |
if (likely(blk_queue_enter(q, bio->bi_opf & REQ_NOWAIT) == 0)) { |
79bd99596 blk: improve orde... |
2116 2117 2118 |
struct bio_list lower, same; /* Create a fresh bio_list for all subordinate requests */ |
f5fe1b519 blk: Ensure users... |
2119 2120 |
bio_list_on_stack[1] = bio_list_on_stack[0]; bio_list_init(&bio_list_on_stack[0]); |
dece16353 block: change ->m... |
2121 |
ret = q->make_request_fn(q, bio); |
3ef28e83a block: generic re... |
2122 2123 |
blk_queue_exit(q); |
27a84d54c block: refactor g... |
2124 |
|
79bd99596 blk: improve orde... |
2125 2126 2127 2128 2129 |
/* sort new bios into those for a lower level * and those for the same level */ bio_list_init(&lower); bio_list_init(&same); |
f5fe1b519 blk: Ensure users... |
2130 |
while ((bio = bio_list_pop(&bio_list_on_stack[0])) != NULL) |
74d46992e block: replace bi... |
2131 |
if (q == bio->bi_disk->queue) |
79bd99596 blk: improve orde... |
2132 2133 2134 2135 |
bio_list_add(&same, bio); else bio_list_add(&lower, bio); /* now assemble so we handle the lowest level first */ |
f5fe1b519 blk: Ensure users... |
2136 2137 2138 |
bio_list_merge(&bio_list_on_stack[0], &lower); bio_list_merge(&bio_list_on_stack[0], &same); bio_list_merge(&bio_list_on_stack[0], &bio_list_on_stack[1]); |
3ef28e83a block: generic re... |
2139 |
} else { |
03a07c92a block: return on ... |
2140 2141 2142 2143 2144 |
if (unlikely(!blk_queue_dying(q) && (bio->bi_opf & REQ_NOWAIT))) bio_wouldblock_error(bio); else bio_io_error(bio); |
3ef28e83a block: generic re... |
2145 |
} |
f5fe1b519 blk: Ensure users... |
2146 |
bio = bio_list_pop(&bio_list_on_stack[0]); |
d89d87965 When stacked bloc... |
2147 |
} while (bio); |
bddd87c7e blk-core: use BIO... |
2148 |
current->bio_list = NULL; /* deactivate */ |
dece16353 block: change ->m... |
2149 2150 2151 |
out: return ret; |
d89d87965 When stacked bloc... |
2152 |
} |
1da177e4c Linux-2.6.12-rc2 |
2153 2154 2155 |
EXPORT_SYMBOL(generic_make_request); /** |
56e5b6b0b block: provide a ... |
2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 |
* direct_make_request - hand a buffer directly to its device driver for I/O * @bio: The bio describing the location in memory and on the device. * * This function behaves like generic_make_request(), but does not protect * against recursion. Must only be used if the called driver is known * to not call generic_make_request (or direct_make_request) again from * its make_request function. (Calling direct_make_request again from * a workqueue is perfectly fine as that doesn't recurse). */ blk_qc_t direct_make_request(struct bio *bio) { struct request_queue *q = bio->bi_disk->queue; bool nowait = bio->bi_opf & REQ_NOWAIT; blk_qc_t ret; if (!generic_make_request_checks(bio)) return BLK_QC_T_NONE; if (unlikely(blk_queue_enter(q, nowait))) { if (nowait && !blk_queue_dying(q)) bio->bi_status = BLK_STS_AGAIN; else bio->bi_status = BLK_STS_IOERR; bio_endio(bio); return BLK_QC_T_NONE; } ret = q->make_request_fn(q, bio); blk_queue_exit(q); return ret; } EXPORT_SYMBOL_GPL(direct_make_request); /** |
710027a48 Add some block/ s... |
2190 |
* submit_bio - submit a bio to the block device layer for I/O |
1da177e4c Linux-2.6.12-rc2 |
2191 2192 2193 2194 |
* @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... |
2195 |
* interfaces; @bio must be presetup and ready for I/O. |
1da177e4c Linux-2.6.12-rc2 |
2196 2197 |
* */ |
4e49ea4a3 block/fs/drivers:... |
2198 |
blk_qc_t submit_bio(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2199 |
{ |
bf2de6f5a block: Initial su... |
2200 2201 2202 2203 |
/* * 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... |
2204 |
if (bio_has_data(bio)) { |
4363ac7c1 block: Implement ... |
2205 |
unsigned int count; |
95fe6c1a2 block, fs, mm, dr... |
2206 |
if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
17644a0bb block: fix the co... |
2207 |
count = queue_logical_block_size(bio->bi_disk->queue) >> 9; |
4363ac7c1 block: Implement ... |
2208 2209 |
else count = bio_sectors(bio); |
a8ebb056a block, drivers, c... |
2210 |
if (op_is_write(bio_op(bio))) { |
bf2de6f5a block: Initial su... |
2211 2212 |
count_vm_events(PGPGOUT, count); } else { |
4f024f379 block: Abstract o... |
2213 |
task_io_account_read(bio->bi_iter.bi_size); |
bf2de6f5a block: Initial su... |
2214 2215 2216 2217 2218 |
count_vm_events(PGPGIN, count); } if (unlikely(block_dump)) { char b[BDEVNAME_SIZE]; |
8dcbdc742 block: block_dump... |
2219 2220 |
printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors) ", |
ba25f9dcc Use helpers to ob... |
2221 |
current->comm, task_pid_nr(current), |
a8ebb056a block, drivers, c... |
2222 |
op_is_write(bio_op(bio)) ? "WRITE" : "READ", |
4f024f379 block: Abstract o... |
2223 |
(unsigned long long)bio->bi_iter.bi_sector, |
74d46992e block: replace bi... |
2224 |
bio_devname(bio, b), count); |
bf2de6f5a block: Initial su... |
2225 |
} |
1da177e4c Linux-2.6.12-rc2 |
2226 |
} |
dece16353 block: change ->m... |
2227 |
return generic_make_request(bio); |
1da177e4c Linux-2.6.12-rc2 |
2228 |
} |
1da177e4c Linux-2.6.12-rc2 |
2229 |
EXPORT_SYMBOL(submit_bio); |
45cde2f81 block: add a poll... |
2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 |
bool blk_poll(struct request_queue *q, blk_qc_t cookie) { if (!q->poll_fn || !blk_qc_t_valid(cookie)) return false; if (current->plug) blk_flush_plug_list(current->plug, false); return q->poll_fn(q, cookie); } EXPORT_SYMBOL_GPL(blk_poll); |
3bcddeac1 blk_end_request: ... |
2240 |
/** |
bf4e6b4e7 block: Always che... |
2241 2242 |
* blk_cloned_rq_check_limits - Helper function to check a cloned request * for new the queue limits |
82124d603 block: add reques... |
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 |
* @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... |
2253 |
* Request stacking drivers like request-based dm may change the queue |
bf4e6b4e7 block: Always che... |
2254 2255 |
* 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... |
2256 |
*/ |
bf4e6b4e7 block: Always che... |
2257 2258 |
static int blk_cloned_rq_check_limits(struct request_queue *q, struct request *rq) |
82124d603 block: add reques... |
2259 |
{ |
8fe0d473f block: convert me... |
2260 |
if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, req_op(rq))) { |
82124d603 block: add reques... |
2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 |
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... |
2273 |
if (rq->nr_phys_segments > queue_max_segments(q)) { |
82124d603 block: add reques... |
2274 2275 2276 2277 2278 2279 2280 |
printk(KERN_ERR "%s: over max segments limit. ", __func__); return -EIO; } return 0; } |
82124d603 block: add reques... |
2281 2282 2283 2284 2285 2286 |
/** * blk_insert_cloned_request - Helper for stacking drivers to submit a request * @q: the queue to submit the request * @rq: the request being queued */ |
2a842acab block: introduce ... |
2287 |
blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *rq) |
82124d603 block: add reques... |
2288 2289 |
{ unsigned long flags; |
4853abaae block: fix flush ... |
2290 |
int where = ELEVATOR_INSERT_BACK; |
82124d603 block: add reques... |
2291 |
|
bf4e6b4e7 block: Always che... |
2292 |
if (blk_cloned_rq_check_limits(q, rq)) |
2a842acab block: introduce ... |
2293 |
return BLK_STS_IOERR; |
82124d603 block: add reques... |
2294 |
|
b2c9cd379 fail_make_request... |
2295 2296 |
if (rq->rq_disk && should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) |
2a842acab block: introduce ... |
2297 |
return BLK_STS_IOERR; |
82124d603 block: add reques... |
2298 |
|
7fb4898e0 block: add blk-mq... |
2299 2300 2301 |
if (q->mq_ops) { if (blk_queue_io_stat(q)) blk_account_io_start(rq, true); |
157f377be block: directly i... |
2302 2303 2304 2305 2306 2307 |
/* * Since we have a scheduler attached on the top device, * bypass a potential scheduler on the bottom device for * insert. */ blk_mq_request_bypass_insert(rq); |
2a842acab block: introduce ... |
2308 |
return BLK_STS_OK; |
7fb4898e0 block: add blk-mq... |
2309 |
} |
82124d603 block: add reques... |
2310 |
spin_lock_irqsave(q->queue_lock, flags); |
3f3299d5c block: Rename que... |
2311 |
if (unlikely(blk_queue_dying(q))) { |
8ba61435d block: add missin... |
2312 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2a842acab block: introduce ... |
2313 |
return BLK_STS_IOERR; |
8ba61435d block: add missin... |
2314 |
} |
82124d603 block: add reques... |
2315 2316 2317 2318 2319 2320 |
/* * Submitting request must be dequeued before calling this function * because it will be linked to another request_queue */ BUG_ON(blk_queued_rq(rq)); |
f73f44eb0 block: add a op_i... |
2321 |
if (op_is_flush(rq->cmd_flags)) |
4853abaae block: fix flush ... |
2322 2323 2324 |
where = ELEVATOR_INSERT_FLUSH; add_acct_request(q, rq, where); |
e67b77c79 blk-flush: move t... |
2325 2326 |
if (where == ELEVATOR_INSERT_FLUSH) __blk_run_queue(q); |
82124d603 block: add reques... |
2327 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2a842acab block: introduce ... |
2328 |
return BLK_STS_OK; |
82124d603 block: add reques... |
2329 2330 |
} EXPORT_SYMBOL_GPL(blk_insert_cloned_request); |
80a761fd3 block: implement ... |
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 |
/** * 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. |
80a761fd3 block: implement ... |
2343 2344 2345 2346 2347 2348 |
*/ 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; |
e80640213 block: split out ... |
2349 |
if (!(rq->rq_flags & RQF_MIXED_MERGE)) |
80a761fd3 block: implement ... |
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 |
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... |
2360 |
if ((bio->bi_opf & ff) != ff) |
80a761fd3 block: implement ... |
2361 |
break; |
4f024f379 block: Abstract o... |
2362 |
bytes += bio->bi_iter.bi_size; |
80a761fd3 block: implement ... |
2363 2364 2365 2366 2367 2368 2369 |
} /* 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... |
2370 |
void blk_account_io_completion(struct request *req, unsigned int bytes) |
bc58ba946 block: add sysfs ... |
2371 |
{ |
c2553b584 block: make blk_d... |
2372 |
if (blk_do_io_stat(req)) { |
bc58ba946 block: add sysfs ... |
2373 2374 2375 2376 2377 |
const int rw = rq_data_dir(req); struct hd_struct *part; int cpu; cpu = part_stat_lock(); |
09e099d4b block: fix accoun... |
2378 |
part = req->part; |
bc58ba946 block: add sysfs ... |
2379 2380 2381 2382 |
part_stat_add(cpu, part, sectors[rw], bytes >> 9); part_stat_unlock(); } } |
320ae51fe blk-mq: new multi... |
2383 |
void blk_account_io_done(struct request *req) |
bc58ba946 block: add sysfs ... |
2384 |
{ |
bc58ba946 block: add sysfs ... |
2385 |
/* |
dd4c133f3 block: rename bar... |
2386 2387 2388 |
* 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 ... |
2389 |
*/ |
e80640213 block: split out ... |
2390 |
if (blk_do_io_stat(req) && !(req->rq_flags & RQF_FLUSH_SEQ)) { |
bc58ba946 block: add sysfs ... |
2391 2392 2393 2394 2395 2396 |
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... |
2397 |
part = req->part; |
bc58ba946 block: add sysfs ... |
2398 2399 2400 |
part_stat_inc(cpu, part, ios[rw]); part_stat_add(cpu, part, ticks[rw], duration); |
d62e26b3f block: pass in qu... |
2401 2402 |
part_round_stats(req->q, cpu, part); part_dec_in_flight(req->q, part, rw); |
bc58ba946 block: add sysfs ... |
2403 |
|
6c23a9681 block: add intern... |
2404 |
hd_struct_put(part); |
bc58ba946 block: add sysfs ... |
2405 2406 2407 |
part_stat_unlock(); } } |
47fafbc70 block / PM: Repla... |
2408 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
2409 2410 2411 2412 2413 2414 2415 2416 |
/* * 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 || |
e80640213 block: split out ... |
2417 |
(q->rpm_status != RPM_ACTIVE && !(rq->rq_flags & RQF_PM)))) |
c8158819d block: implement ... |
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 |
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... |
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 |
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); } |
d62e26b3f block: pass in qu... |
2457 2458 |
part_round_stats(rq->q, cpu, part); part_inc_in_flight(rq->q, part, rw); |
320ae51fe blk-mq: new multi... |
2459 2460 2461 2462 2463 |
rq->part = part; } part_stat_unlock(); } |
53a08807c block: internal d... |
2464 |
/** |
9934c8c04 block: implement ... |
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 |
* 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. |
9934c8c04 block: implement ... |
2476 2477 |
*/ struct request *blk_peek_request(struct request_queue *q) |
158dbda00 block: reorganize... |
2478 2479 2480 |
{ struct request *rq; int ret; |
2fff8a924 block: Check lock... |
2481 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
2482 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
2483 |
|
158dbda00 block: reorganize... |
2484 |
while ((rq = __elv_next_request(q)) != NULL) { |
c8158819d block: implement ... |
2485 2486 2487 2488 |
rq = blk_pm_peek_request(q, rq); if (!rq) break; |
e80640213 block: split out ... |
2489 |
if (!(rq->rq_flags & RQF_STARTED)) { |
158dbda00 block: reorganize... |
2490 2491 2492 2493 2494 |
/* * This is the first time the device driver * sees this request (possibly after * requeueing). Notify IO scheduler. */ |
e80640213 block: split out ... |
2495 |
if (rq->rq_flags & RQF_SORTED) |
158dbda00 block: reorganize... |
2496 2497 2498 2499 2500 2501 2502 |
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 */ |
e80640213 block: split out ... |
2503 |
rq->rq_flags |= RQF_STARTED; |
158dbda00 block: reorganize... |
2504 2505 2506 2507 2508 2509 2510 |
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; } |
e80640213 block: split out ... |
2511 |
if (rq->rq_flags & RQF_DONTPREP) |
158dbda00 block: reorganize... |
2512 |
break; |
2e46e8b27 block: drop reque... |
2513 |
if (q->dma_drain_size && blk_rq_bytes(rq)) { |
158dbda00 block: reorganize... |
2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 |
/* * 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 |
e80640213 block: split out ... |
2533 |
* avoid resource deadlock. RQF_STARTED will |
158dbda00 block: reorganize... |
2534 2535 |
* prevent other fs requests from passing this one. */ |
2e46e8b27 block: drop reque... |
2536 |
if (q->dma_drain_size && blk_rq_bytes(rq) && |
e80640213 block: split out ... |
2537 |
!(rq->rq_flags & RQF_DONTPREP)) { |
158dbda00 block: reorganize... |
2538 2539 2540 2541 2542 2543 2544 2545 2546 |
/* * 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 ... |
2547 |
} else if (ret == BLKPREP_KILL || ret == BLKPREP_INVALID) { |
e80640213 block: split out ... |
2548 |
rq->rq_flags |= RQF_QUIET; |
c143dc903 block: fix an oop... |
2549 2550 2551 2552 2553 |
/* * Mark this request as started so we don't trigger * any debug logic in the end I/O path. */ blk_start_request(rq); |
2a842acab block: introduce ... |
2554 2555 |
__blk_end_request_all(rq, ret == BLKPREP_INVALID ? BLK_STS_TARGET : BLK_STS_IOERR); |
158dbda00 block: reorganize... |
2556 2557 2558 2559 2560 2561 2562 2563 2564 |
} else { printk(KERN_ERR "%s: bad return=%d ", __func__, ret); break; } } return rq; } |
9934c8c04 block: implement ... |
2565 |
EXPORT_SYMBOL(blk_peek_request); |
158dbda00 block: reorganize... |
2566 |
|
5034435c8 block: Make blk_d... |
2567 |
static void blk_dequeue_request(struct request *rq) |
158dbda00 block: reorganize... |
2568 |
{ |
9934c8c04 block: implement ... |
2569 |
struct request_queue *q = rq->q; |
158dbda00 block: reorganize... |
2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 |
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 ... |
2580 |
if (blk_account_rq(rq)) { |
0a7ae2ff0 block: change the... |
2581 |
q->in_flight[rq_is_sync(rq)]++; |
9195291e5 blkio: Increment ... |
2582 2583 |
set_io_start_time_ns(rq); } |
158dbda00 block: reorganize... |
2584 |
} |
5efccd17c block: reorder re... |
2585 |
/** |
9934c8c04 block: implement ... |
2586 2587 2588 2589 2590 2591 |
* 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. |
9934c8c04 block: implement ... |
2592 2593 2594 |
*/ void blk_start_request(struct request *req) { |
2fff8a924 block: Check lock... |
2595 |
lockdep_assert_held(req->q->queue_lock); |
332ebbf7f block: Document w... |
2596 |
WARN_ON_ONCE(req->q->mq_ops); |
2fff8a924 block: Check lock... |
2597 |
|
9934c8c04 block: implement ... |
2598 |
blk_dequeue_request(req); |
cf43e6be8 block: add scalab... |
2599 |
if (test_bit(QUEUE_FLAG_STATS, &req->q->queue_flags)) { |
88eeca495 block: track requ... |
2600 |
blk_stat_set_issue(&req->issue_stat, blk_rq_sectors(req)); |
cf43e6be8 block: add scalab... |
2601 |
req->rq_flags |= RQF_STATS; |
87760e5ee block: hook up wr... |
2602 |
wbt_issue(req->q->rq_wb, &req->issue_stat); |
cf43e6be8 block: add scalab... |
2603 |
} |
4912aa6c1 block: fix race b... |
2604 |
BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); |
9934c8c04 block: implement ... |
2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 |
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. |
9934c8c04 block: implement ... |
2620 2621 2622 2623 |
*/ struct request *blk_fetch_request(struct request_queue *q) { struct request *rq; |
2fff8a924 block: Check lock... |
2624 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
2625 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
2626 |
|
9934c8c04 block: implement ... |
2627 2628 2629 2630 2631 2632 |
rq = blk_peek_request(q); if (rq) blk_start_request(rq); return rq; } EXPORT_SYMBOL(blk_fetch_request); |
091b43061 block: add a blk_... |
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 |
/* * Steal bios from a request and add them to a bio list. * The request must not have been partially completed before. */ void blk_steal_bios(struct bio_list *list, struct request *rq) { if (rq->bio) { if (list->tail) list->tail->bi_next = rq->bio; else list->head = rq->bio; list->tail = rq->biotail; rq->bio = NULL; rq->biotail = NULL; } rq->__data_len = 0; } EXPORT_SYMBOL_GPL(blk_steal_bios); |
9934c8c04 block: implement ... |
2653 |
/** |
2e60e0229 block: clean up r... |
2654 |
* blk_update_request - Special helper function for request stacking drivers |
8ebf97560 block: fix kernel... |
2655 |
* @req: the request being processed |
2a842acab block: introduce ... |
2656 |
* @error: block status code |
8ebf97560 block: fix kernel... |
2657 |
* @nr_bytes: number of bytes to complete @req |
3bcddeac1 blk_end_request: ... |
2658 2659 |
* * Description: |
8ebf97560 block: fix kernel... |
2660 2661 2662 |
* 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... |
2663 2664 2665 2666 2667 2668 2669 |
* * 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: ... |
2670 2671 |
* * Return: |
2e60e0229 block: clean up r... |
2672 2673 |
* %false - this request doesn't have any more data * %true - this request has more data |
3bcddeac1 blk_end_request: ... |
2674 |
**/ |
2a842acab block: introduce ... |
2675 2676 |
bool blk_update_request(struct request *req, blk_status_t error, unsigned int nr_bytes) |
1da177e4c Linux-2.6.12-rc2 |
2677 |
{ |
f79ea4161 block: Refactor b... |
2678 |
int total_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2679 |
|
2a842acab block: introduce ... |
2680 |
trace_block_rq_complete(req, blk_status_to_errno(error), nr_bytes); |
4a0efdc93 block: misplaced ... |
2681 |
|
2e60e0229 block: clean up r... |
2682 2683 |
if (!req->bio) return false; |
2a842acab block: introduce ... |
2684 2685 2686 |
if (unlikely(error && !blk_rq_is_passthrough(req) && !(req->rq_flags & RQF_QUIET))) print_req_error(req, error); |
1da177e4c Linux-2.6.12-rc2 |
2687 |
|
bc58ba946 block: add sysfs ... |
2688 |
blk_account_io_completion(req, nr_bytes); |
d72d904a5 [BLOCK] Update re... |
2689 |
|
f79ea4161 block: Refactor b... |
2690 2691 2692 |
total_bytes = 0; while (req->bio) { struct bio *bio = req->bio; |
4f024f379 block: Abstract o... |
2693 |
unsigned bio_bytes = min(bio->bi_iter.bi_size, nr_bytes); |
1da177e4c Linux-2.6.12-rc2 |
2694 |
|
4f024f379 block: Abstract o... |
2695 |
if (bio_bytes == bio->bi_iter.bi_size) |
1da177e4c Linux-2.6.12-rc2 |
2696 |
req->bio = bio->bi_next; |
1da177e4c Linux-2.6.12-rc2 |
2697 |
|
fbbaf700e block: trace comp... |
2698 2699 |
/* Completion has already been traced */ bio_clear_flag(bio, BIO_TRACE_COMPLETION); |
f79ea4161 block: Refactor b... |
2700 |
req_bio_endio(req, bio, bio_bytes, error); |
1da177e4c Linux-2.6.12-rc2 |
2701 |
|
f79ea4161 block: Refactor b... |
2702 2703 |
total_bytes += bio_bytes; nr_bytes -= bio_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2704 |
|
f79ea4161 block: Refactor b... |
2705 2706 |
if (!nr_bytes) break; |
1da177e4c Linux-2.6.12-rc2 |
2707 2708 2709 2710 2711 |
} /* * completely done */ |
2e60e0229 block: clean up r... |
2712 2713 2714 2715 2716 2717 |
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... |
2718 |
req->__data_len = 0; |
2e60e0229 block: clean up r... |
2719 2720 |
return false; } |
1da177e4c Linux-2.6.12-rc2 |
2721 |
|
a2dec7b36 block: hide reque... |
2722 |
req->__data_len -= total_bytes; |
2e46e8b27 block: drop reque... |
2723 2724 |
/* update sector only for requests with clear definition of sector */ |
57292b58d block: introduce ... |
2725 |
if (!blk_rq_is_passthrough(req)) |
a2dec7b36 block: hide reque... |
2726 |
req->__sector += total_bytes >> 9; |
2e46e8b27 block: drop reque... |
2727 |
|
80a761fd3 block: implement ... |
2728 |
/* mixed attributes always follow the first bio */ |
e80640213 block: split out ... |
2729 |
if (req->rq_flags & RQF_MIXED_MERGE) { |
80a761fd3 block: implement ... |
2730 |
req->cmd_flags &= ~REQ_FAILFAST_MASK; |
1eff9d322 block: rename bio... |
2731 |
req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK; |
80a761fd3 block: implement ... |
2732 |
} |
ed6565e73 block: handle par... |
2733 2734 2735 2736 2737 2738 2739 2740 2741 |
if (!(req->rq_flags & RQF_SPECIAL_PAYLOAD)) { /* * 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)) { blk_dump_rq_flags(req, "request botched"); req->__data_len = blk_rq_cur_bytes(req); } |
2e46e8b27 block: drop reque... |
2742 |
|
ed6565e73 block: handle par... |
2743 2744 2745 |
/* recalculate the number of segments */ blk_recalc_rq_segments(req); } |
2e46e8b27 block: drop reque... |
2746 |
|
2e60e0229 block: clean up r... |
2747 |
return true; |
1da177e4c Linux-2.6.12-rc2 |
2748 |
} |
2e60e0229 block: clean up r... |
2749 |
EXPORT_SYMBOL_GPL(blk_update_request); |
1da177e4c Linux-2.6.12-rc2 |
2750 |
|
2a842acab block: introduce ... |
2751 |
static bool blk_update_bidi_request(struct request *rq, blk_status_t error, |
2e60e0229 block: clean up r... |
2752 2753 |
unsigned int nr_bytes, unsigned int bidi_bytes) |
5efccd17c block: reorder re... |
2754 |
{ |
2e60e0229 block: clean up r... |
2755 2756 |
if (blk_update_request(rq, error, nr_bytes)) return true; |
5efccd17c block: reorder re... |
2757 |
|
2e60e0229 block: clean up r... |
2758 2759 2760 2761 |
/* 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... |
2762 |
|
e2e1a148b block: add sysfs ... |
2763 2764 |
if (blk_queue_add_random(rq->q)) add_disk_randomness(rq->rq_disk); |
2e60e0229 block: clean up r... |
2765 2766 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
2767 |
} |
28018c242 block: implement ... |
2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 |
/** * 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; |
e80640213 block: split out ... |
2781 |
req->rq_flags &= ~RQF_DONTPREP; |
28018c242 block: implement ... |
2782 2783 2784 2785 |
if (q->unprep_rq_fn) q->unprep_rq_fn(q, req); } EXPORT_SYMBOL_GPL(blk_unprep_request); |
2a842acab block: introduce ... |
2786 |
void blk_finish_request(struct request *req, blk_status_t error) |
1da177e4c Linux-2.6.12-rc2 |
2787 |
{ |
cf43e6be8 block: add scalab... |
2788 |
struct request_queue *q = req->q; |
2fff8a924 block: Check lock... |
2789 |
lockdep_assert_held(req->q->queue_lock); |
332ebbf7f block: Document w... |
2790 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
2791 |
|
cf43e6be8 block: add scalab... |
2792 |
if (req->rq_flags & RQF_STATS) |
34dbad5d2 blk-stat: convert... |
2793 |
blk_stat_add(req); |
cf43e6be8 block: add scalab... |
2794 |
|
e80640213 block: split out ... |
2795 |
if (req->rq_flags & RQF_QUEUED) |
cf43e6be8 block: add scalab... |
2796 |
blk_queue_end_tag(q, req); |
b8286239d blk_end_request: ... |
2797 |
|
ba396a6c1 block: fix oops w... |
2798 |
BUG_ON(blk_queued_rq(req)); |
1da177e4c Linux-2.6.12-rc2 |
2799 |
|
57292b58d block: introduce ... |
2800 |
if (unlikely(laptop_mode) && !blk_rq_is_passthrough(req)) |
dc3b17cc8 block: Use pointe... |
2801 |
laptop_io_completion(req->q->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
2802 |
|
e78042e5b blk: move blk_del... |
2803 |
blk_delete_timer(req); |
e80640213 block: split out ... |
2804 |
if (req->rq_flags & RQF_DONTPREP) |
28018c242 block: implement ... |
2805 |
blk_unprep_request(req); |
bc58ba946 block: add sysfs ... |
2806 |
blk_account_io_done(req); |
b8286239d blk_end_request: ... |
2807 |
|
87760e5ee block: hook up wr... |
2808 2809 |
if (req->end_io) { wbt_done(req->q->rq_wb, &req->issue_stat); |
8ffdc6550 [BLOCK] add @upto... |
2810 |
req->end_io(req, error); |
87760e5ee block: hook up wr... |
2811 |
} else { |
b8286239d blk_end_request: ... |
2812 2813 |
if (blk_bidi_rq(req)) __blk_put_request(req->next_rq->q, req->next_rq); |
cf43e6be8 block: add scalab... |
2814 |
__blk_put_request(q, req); |
b8286239d blk_end_request: ... |
2815 |
} |
1da177e4c Linux-2.6.12-rc2 |
2816 |
} |
12120077b block: export blk... |
2817 |
EXPORT_SYMBOL(blk_finish_request); |
1da177e4c Linux-2.6.12-rc2 |
2818 |
|
3b11313a6 blk_end_request: ... |
2819 |
/** |
2e60e0229 block: clean up r... |
2820 2821 |
* blk_end_bidi_request - Complete a bidi request * @rq: the request to complete |
2a842acab block: introduce ... |
2822 |
* @error: block status code |
2e60e0229 block: clean up r... |
2823 2824 |
* @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
a0cd12854 block: add end_qu... |
2825 2826 |
* * Description: |
e3a04fe34 blk_end_request: ... |
2827 |
* Ends I/O on a number of bytes attached to @rq and @rq->next_rq. |
2e60e0229 block: clean up r... |
2828 2829 2830 |
* 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: ... |
2831 2832 |
* * Return: |
2e60e0229 block: clean up r... |
2833 2834 |
* %false - we are done with this request * %true - still buffers pending for this request |
a0cd12854 block: add end_qu... |
2835 |
**/ |
2a842acab block: introduce ... |
2836 |
static bool blk_end_bidi_request(struct request *rq, blk_status_t error, |
32fab448e block: add reques... |
2837 2838 |
unsigned int nr_bytes, unsigned int bidi_bytes) { |
336cdb400 blk_end_request: ... |
2839 |
struct request_queue *q = rq->q; |
2e60e0229 block: clean up r... |
2840 |
unsigned long flags; |
32fab448e block: add reques... |
2841 |
|
332ebbf7f block: Document w... |
2842 |
WARN_ON_ONCE(q->mq_ops); |
2e60e0229 block: clean up r... |
2843 2844 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
32fab448e block: add reques... |
2845 |
|
336cdb400 blk_end_request: ... |
2846 |
spin_lock_irqsave(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
2847 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
2848 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
2849 |
return false; |
32fab448e block: add reques... |
2850 |
} |
336cdb400 blk_end_request: ... |
2851 |
/** |
2e60e0229 block: clean up r... |
2852 2853 |
* __blk_end_bidi_request - Complete a bidi request with queue lock held * @rq: the request to complete |
2a842acab block: introduce ... |
2854 |
* @error: block status code |
e3a04fe34 blk_end_request: ... |
2855 2856 |
* @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
336cdb400 blk_end_request: ... |
2857 2858 |
* * Description: |
2e60e0229 block: clean up r... |
2859 2860 |
* 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: ... |
2861 2862 |
* * Return: |
2e60e0229 block: clean up r... |
2863 2864 |
* %false - we are done with this request * %true - still buffers pending for this request |
336cdb400 blk_end_request: ... |
2865 |
**/ |
2a842acab block: introduce ... |
2866 |
static bool __blk_end_bidi_request(struct request *rq, blk_status_t error, |
b1f744937 block: move compl... |
2867 |
unsigned int nr_bytes, unsigned int bidi_bytes) |
336cdb400 blk_end_request: ... |
2868 |
{ |
2fff8a924 block: Check lock... |
2869 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
2870 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
2871 |
|
2e60e0229 block: clean up r... |
2872 2873 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
336cdb400 blk_end_request: ... |
2874 |
|
2e60e0229 block: clean up r... |
2875 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
2876 |
|
2e60e0229 block: clean up r... |
2877 |
return false; |
336cdb400 blk_end_request: ... |
2878 |
} |
e19a3ab05 blk_end_request: ... |
2879 2880 2881 2882 |
/** * blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed |
2a842acab block: introduce ... |
2883 |
* @error: block status code |
e19a3ab05 blk_end_request: ... |
2884 2885 2886 2887 2888 2889 2890 |
* @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... |
2891 2892 |
* %false - we are done with this request * %true - still buffers pending for this request |
e19a3ab05 blk_end_request: ... |
2893 |
**/ |
2a842acab block: introduce ... |
2894 2895 |
bool blk_end_request(struct request *rq, blk_status_t error, unsigned int nr_bytes) |
e19a3ab05 blk_end_request: ... |
2896 |
{ |
332ebbf7f block: Document w... |
2897 |
WARN_ON_ONCE(rq->q->mq_ops); |
b1f744937 block: move compl... |
2898 |
return blk_end_bidi_request(rq, error, nr_bytes, 0); |
e19a3ab05 blk_end_request: ... |
2899 |
} |
56ad1740d block: make the e... |
2900 |
EXPORT_SYMBOL(blk_end_request); |
336cdb400 blk_end_request: ... |
2901 2902 |
/** |
b1f744937 block: move compl... |
2903 2904 |
* blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
2a842acab block: introduce ... |
2905 |
* @error: block status code |
336cdb400 blk_end_request: ... |
2906 2907 |
* * Description: |
b1f744937 block: move compl... |
2908 2909 |
* Completely finish @rq. */ |
2a842acab block: introduce ... |
2910 |
void blk_end_request_all(struct request *rq, blk_status_t error) |
336cdb400 blk_end_request: ... |
2911 |
{ |
b1f744937 block: move compl... |
2912 2913 |
bool pending; unsigned int bidi_bytes = 0; |
336cdb400 blk_end_request: ... |
2914 |
|
b1f744937 block: move compl... |
2915 2916 |
if (unlikely(blk_bidi_rq(rq))) bidi_bytes = blk_rq_bytes(rq->next_rq); |
336cdb400 blk_end_request: ... |
2917 |
|
b1f744937 block: move compl... |
2918 2919 2920 |
pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); BUG_ON(pending); } |
56ad1740d block: make the e... |
2921 |
EXPORT_SYMBOL(blk_end_request_all); |
336cdb400 blk_end_request: ... |
2922 |
|
b1f744937 block: move compl... |
2923 |
/** |
b1f744937 block: move compl... |
2924 2925 |
* __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed |
2a842acab block: introduce ... |
2926 |
* @error: block status code |
b1f744937 block: move compl... |
2927 |
* @nr_bytes: number of bytes to complete |
e3a04fe34 blk_end_request: ... |
2928 2929 |
* * Description: |
b1f744937 block: move compl... |
2930 |
* Must be called with queue lock held unlike blk_end_request(). |
e3a04fe34 blk_end_request: ... |
2931 2932 |
* * Return: |
b1f744937 block: move compl... |
2933 2934 |
* %false - we are done with this request * %true - still buffers pending for this request |
e3a04fe34 blk_end_request: ... |
2935 |
**/ |
2a842acab block: introduce ... |
2936 2937 |
bool __blk_end_request(struct request *rq, blk_status_t error, unsigned int nr_bytes) |
e3a04fe34 blk_end_request: ... |
2938 |
{ |
2fff8a924 block: Check lock... |
2939 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
2940 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
2941 |
|
b1f744937 block: move compl... |
2942 |
return __blk_end_bidi_request(rq, error, nr_bytes, 0); |
e3a04fe34 blk_end_request: ... |
2943 |
} |
56ad1740d block: make the e... |
2944 |
EXPORT_SYMBOL(__blk_end_request); |
e3a04fe34 blk_end_request: ... |
2945 2946 |
/** |
b1f744937 block: move compl... |
2947 2948 |
* __blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
2a842acab block: introduce ... |
2949 |
* @error: block status code |
32fab448e block: add reques... |
2950 2951 |
* * Description: |
b1f744937 block: move compl... |
2952 |
* Completely finish @rq. Must be called with queue lock held. |
32fab448e block: add reques... |
2953 |
*/ |
2a842acab block: introduce ... |
2954 |
void __blk_end_request_all(struct request *rq, blk_status_t error) |
32fab448e block: add reques... |
2955 |
{ |
b1f744937 block: move compl... |
2956 2957 |
bool pending; unsigned int bidi_bytes = 0; |
2fff8a924 block: Check lock... |
2958 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
2959 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
2960 |
|
b1f744937 block: move compl... |
2961 2962 2963 2964 2965 |
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... |
2966 |
} |
56ad1740d block: make the e... |
2967 |
EXPORT_SYMBOL(__blk_end_request_all); |
32fab448e block: add reques... |
2968 2969 |
/** |
b1f744937 block: move compl... |
2970 2971 |
* __blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for |
2a842acab block: introduce ... |
2972 |
* @error: block status code |
e19a3ab05 blk_end_request: ... |
2973 2974 |
* * Description: |
b1f744937 block: move compl... |
2975 2976 |
* Complete the current consecutively mapped chunk from @rq. Must * be called with queue lock held. |
e19a3ab05 blk_end_request: ... |
2977 2978 |
* * Return: |
b1f744937 block: move compl... |
2979 2980 2981 |
* %false - we are done with this request * %true - still buffers pending for this request */ |
2a842acab block: introduce ... |
2982 |
bool __blk_end_request_cur(struct request *rq, blk_status_t error) |
e19a3ab05 blk_end_request: ... |
2983 |
{ |
b1f744937 block: move compl... |
2984 |
return __blk_end_request(rq, error, blk_rq_cur_bytes(rq)); |
e19a3ab05 blk_end_request: ... |
2985 |
} |
56ad1740d block: make the e... |
2986 |
EXPORT_SYMBOL(__blk_end_request_cur); |
e19a3ab05 blk_end_request: ... |
2987 |
|
86db1e297 block: continue l... |
2988 2989 |
void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2990 |
{ |
b4f42e283 block: remove str... |
2991 |
if (bio_has_data(bio)) |
fb2dce862 Add 'discard' req... |
2992 |
rq->nr_phys_segments = bio_phys_segments(q, bio); |
73027d80d blk-mq: fix disca... |
2993 2994 |
else if (bio_op(bio) == REQ_OP_DISCARD) rq->nr_phys_segments = 1; |
b4f42e283 block: remove str... |
2995 |
|
4f024f379 block: Abstract o... |
2996 |
rq->__data_len = bio->bi_iter.bi_size; |
1da177e4c Linux-2.6.12-rc2 |
2997 |
rq->bio = rq->biotail = bio; |
1da177e4c Linux-2.6.12-rc2 |
2998 |
|
74d46992e block: replace bi... |
2999 3000 |
if (bio->bi_disk) rq->rq_disk = bio->bi_disk; |
66846572b Stop exporting bl... |
3001 |
} |
1da177e4c Linux-2.6.12-rc2 |
3002 |
|
2d4dc890b block: add helper... |
3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 |
#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... |
3014 |
struct bio_vec bvec; |
2d4dc890b block: add helper... |
3015 3016 |
rq_for_each_segment(bvec, rq, iter) |
7988613b0 block: Convert bi... |
3017 |
flush_dcache_page(bvec.bv_page); |
2d4dc890b block: add helper... |
3018 3019 3020 |
} EXPORT_SYMBOL_GPL(rq_flush_dcache_pages); #endif |
ef9e3facd block: add lld bu... |
3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 |
/** * 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... |
3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 |
/** * 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... |
3072 3073 |
{ dst->cpu = src->cpu; |
b0fd271d5 block: add reques... |
3074 3075 |
dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); |
251141340 block: Fix clonin... |
3076 3077 3078 3079 |
if (src->rq_flags & RQF_SPECIAL_PAYLOAD) { dst->rq_flags |= RQF_SPECIAL_PAYLOAD; dst->special_vec = src->special_vec; } |
b0fd271d5 block: add reques... |
3080 3081 3082 |
dst->nr_phys_segments = src->nr_phys_segments; dst->ioprio = src->ioprio; dst->extra_len = src->extra_len; |
78d8e58a0 Revert "block, dm... |
3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 |
} /** * 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... |
3139 3140 |
} EXPORT_SYMBOL_GPL(blk_rq_prep_clone); |
59c3d45e4 block: remove 'q'... |
3141 |
int kblockd_schedule_work(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
3142 3143 3144 |
{ return queue_work(kblockd_workqueue, work); } |
1da177e4c Linux-2.6.12-rc2 |
3145 |
EXPORT_SYMBOL(kblockd_schedule_work); |
ee63cfa7f block: add kblock... |
3146 3147 3148 3149 3150 |
int kblockd_schedule_work_on(int cpu, struct work_struct *work) { return queue_work_on(cpu, kblockd_workqueue, work); } EXPORT_SYMBOL(kblockd_schedule_work_on); |
818cd1cba block: add kblock... |
3151 3152 3153 3154 3155 3156 |
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay) { return mod_delayed_work_on(cpu, kblockd_workqueue, dwork, delay); } EXPORT_SYMBOL(kblockd_mod_delayed_work_on); |
59c3d45e4 block: remove 'q'... |
3157 3158 |
int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay) |
e43473b7f blkio: Core imple... |
3159 3160 3161 3162 |
{ return queue_delayed_work(kblockd_workqueue, dwork, delay); } EXPORT_SYMBOL(kblockd_schedule_delayed_work); |
8ab14595b block: add kblock... |
3163 3164 3165 3166 3167 3168 |
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... |
3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 |
/** * 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... |
3183 3184 3185 |
void blk_start_plug(struct blk_plug *plug) { struct task_struct *tsk = current; |
dd6cf3e18 blk: clean up plug |
3186 3187 3188 3189 3190 |
/* * If this is a nested plug, don't actually assign it. */ if (tsk->plug) return; |
73c101011 block: initial pa... |
3191 |
INIT_LIST_HEAD(&plug->list); |
320ae51fe blk-mq: new multi... |
3192 |
INIT_LIST_HEAD(&plug->mq_list); |
048c9374a block: Enhance ne... |
3193 |
INIT_LIST_HEAD(&plug->cb_list); |
73c101011 block: initial pa... |
3194 |
/* |
dd6cf3e18 blk: clean up plug |
3195 3196 |
* Store ordering should not be needed here, since a potential * preempt will imply a full memory barrier |
73c101011 block: initial pa... |
3197 |
*/ |
dd6cf3e18 blk: clean up plug |
3198 |
tsk->plug = plug; |
73c101011 block: initial pa... |
3199 3200 3201 3202 3203 3204 3205 |
} 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... |
3206 3207 |
return !(rqa->q < rqb->q || (rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb))); |
73c101011 block: initial pa... |
3208 |
} |
49cac01e1 block: make unplu... |
3209 3210 3211 3212 3213 3214 |
/* * 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... |
3215 |
static void queue_unplugged(struct request_queue *q, unsigned int depth, |
49cac01e1 block: make unplu... |
3216 |
bool from_schedule) |
99e22598e block: drop queue... |
3217 |
__releases(q->queue_lock) |
94b5eb28b block: fixup bloc... |
3218 |
{ |
2fff8a924 block: Check lock... |
3219 |
lockdep_assert_held(q->queue_lock); |
49cac01e1 block: make unplu... |
3220 |
trace_block_unplug(q, depth, !from_schedule); |
99e22598e block: drop queue... |
3221 |
|
704605711 block: Avoid sche... |
3222 |
if (from_schedule) |
24ecfbe27 block: add blk_ru... |
3223 |
blk_run_queue_async(q); |
704605711 block: Avoid sche... |
3224 |
else |
24ecfbe27 block: add blk_ru... |
3225 |
__blk_run_queue(q); |
704605711 block: Avoid sche... |
3226 |
spin_unlock(q->queue_lock); |
94b5eb28b block: fixup bloc... |
3227 |
} |
74018dc30 blk: pass from_sc... |
3228 |
static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) |
048c9374a block: Enhance ne... |
3229 3230 |
{ LIST_HEAD(callbacks); |
2a7d5559b block: stack unplug |
3231 3232 |
while (!list_empty(&plug->cb_list)) { list_splice_init(&plug->cb_list, &callbacks); |
048c9374a block: Enhance ne... |
3233 |
|
2a7d5559b block: stack unplug |
3234 3235 |
while (!list_empty(&callbacks)) { struct blk_plug_cb *cb = list_first_entry(&callbacks, |
048c9374a block: Enhance ne... |
3236 3237 |
struct blk_plug_cb, list); |
2a7d5559b block: stack unplug |
3238 |
list_del(&cb->list); |
74018dc30 blk: pass from_sc... |
3239 |
cb->callback(cb, from_schedule); |
2a7d5559b block: stack unplug |
3240 |
} |
048c9374a block: Enhance ne... |
3241 3242 |
} } |
9cbb17508 blk: centralize n... |
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 |
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... |
3267 |
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) |
73c101011 block: initial pa... |
3268 3269 3270 3271 |
{ struct request_queue *q; unsigned long flags; struct request *rq; |
109b81296 block: splice plu... |
3272 |
LIST_HEAD(list); |
94b5eb28b block: fixup bloc... |
3273 |
unsigned int depth; |
73c101011 block: initial pa... |
3274 |
|
74018dc30 blk: pass from_sc... |
3275 |
flush_plug_callbacks(plug, from_schedule); |
320ae51fe blk-mq: new multi... |
3276 3277 3278 |
if (!list_empty(&plug->mq_list)) blk_mq_flush_plug_list(plug, from_schedule); |
73c101011 block: initial pa... |
3279 3280 |
if (list_empty(&plug->list)) return; |
109b81296 block: splice plu... |
3281 |
list_splice_init(&plug->list, &list); |
422765c26 block: Remove sho... |
3282 |
list_sort(NULL, &list, plug_rq_cmp); |
73c101011 block: initial pa... |
3283 3284 |
q = NULL; |
94b5eb28b block: fixup bloc... |
3285 |
depth = 0; |
188112722 block: add commen... |
3286 3287 3288 3289 3290 |
/* * Save and disable interrupts here, to avoid doing it for every * queue lock we have to take. */ |
73c101011 block: initial pa... |
3291 |
local_irq_save(flags); |
109b81296 block: splice plu... |
3292 3293 |
while (!list_empty(&list)) { rq = list_entry_rq(list.next); |
73c101011 block: initial pa... |
3294 |
list_del_init(&rq->queuelist); |
73c101011 block: initial pa... |
3295 3296 |
BUG_ON(!rq->q); if (rq->q != q) { |
99e22598e block: drop queue... |
3297 3298 3299 3300 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3301 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3302 |
q = rq->q; |
94b5eb28b block: fixup bloc... |
3303 |
depth = 0; |
73c101011 block: initial pa... |
3304 3305 |
spin_lock(q->queue_lock); } |
8ba61435d block: add missin... |
3306 3307 3308 3309 |
/* * Short-circuit if @q is dead */ |
3f3299d5c block: Rename que... |
3310 |
if (unlikely(blk_queue_dying(q))) { |
2a842acab block: introduce ... |
3311 |
__blk_end_request_all(rq, BLK_STS_IOERR); |
8ba61435d block: add missin... |
3312 3313 |
continue; } |
73c101011 block: initial pa... |
3314 3315 3316 |
/* * rq is already accounted, so use raw insert */ |
f73f44eb0 block: add a op_i... |
3317 |
if (op_is_flush(rq->cmd_flags)) |
401a18e92 block: fix bug wi... |
3318 3319 3320 |
__elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH); else __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE); |
94b5eb28b block: fixup bloc... |
3321 3322 |
depth++; |
73c101011 block: initial pa... |
3323 |
} |
99e22598e block: drop queue... |
3324 3325 3326 3327 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3328 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3329 |
|
73c101011 block: initial pa... |
3330 3331 |
local_irq_restore(flags); } |
73c101011 block: initial pa... |
3332 3333 3334 |
void blk_finish_plug(struct blk_plug *plug) { |
dd6cf3e18 blk: clean up plug |
3335 3336 |
if (plug != current->plug) return; |
f6603783f block: only force... |
3337 |
blk_flush_plug_list(plug, false); |
73c101011 block: initial pa... |
3338 |
|
dd6cf3e18 blk: clean up plug |
3339 |
current->plug = NULL; |
73c101011 block: initial pa... |
3340 |
} |
88b996cd0 block: cleanup th... |
3341 |
EXPORT_SYMBOL(blk_finish_plug); |
73c101011 block: initial pa... |
3342 |
|
47fafbc70 block / PM: Repla... |
3343 |
#ifdef CONFIG_PM |
6c9546675 block: add runtim... |
3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 |
/** * 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) { |
1e2698976 block: really dis... |
3367 3368 3369 |
/* Don't enable runtime PM for blk-mq until it is ready */ if (q->mq_ops) { pm_runtime_disable(dev); |
765e40b67 block: disable ru... |
3370 |
return; |
1e2698976 block: really dis... |
3371 |
} |
765e40b67 block: disable ru... |
3372 |
|
6c9546675 block: add runtim... |
3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 |
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... |
3404 3405 |
if (!q->dev) return ret; |
6c9546675 block: add runtim... |
3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 |
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... |
3433 3434 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 |
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... |
3459 3460 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 |
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... |
3483 3484 |
if (!q->dev) return; |
6c9546675 block: add runtim... |
3485 3486 3487 3488 3489 |
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... |
3490 |
pm_request_autosuspend(q->dev); |
6c9546675 block: add runtim... |
3491 3492 3493 3494 3495 3496 |
} else { q->rpm_status = RPM_SUSPENDED; } spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_post_runtime_resume); |
d07ab6d11 block: Add blk_se... |
3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 |
/** * 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... |
3521 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3522 3523 |
int __init blk_dev_init(void) { |
ef295ecf0 block: better op ... |
3524 3525 |
BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS)); BUILD_BUG_ON(REQ_OP_BITS + REQ_FLAG_BITS > 8 * |
0762b23d2 block: use FIELD_... |
3526 |
FIELD_SIZEOF(struct request, cmd_flags)); |
ef295ecf0 block: better op ... |
3527 3528 |
BUILD_BUG_ON(REQ_OP_BITS + REQ_FLAG_BITS > 8 * FIELD_SIZEOF(struct bio, bi_opf)); |
9eb55b030 block: catch tryi... |
3529 |
|
89b90be2d block: make kbloc... |
3530 3531 |
/* used for unplugging and affects IO latency/throughput - HIGHPRI */ kblockd_workqueue = alloc_workqueue("kblockd", |
28747fcd2 block: remove WQ_... |
3532 |
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); |
1da177e4c Linux-2.6.12-rc2 |
3533 3534 3535 3536 3537 |
if (!kblockd_workqueue) panic("Failed to create kblockd "); request_cachep = kmem_cache_create("blkdev_requests", |
20c2df83d mm: Remove slab d... |
3538 |
sizeof(struct request), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
3539 |
|
c2789bd40 block: rename req... |
3540 |
blk_requestq_cachep = kmem_cache_create("request_queue", |
165125e1e [BLOCK] Get rid o... |
3541 |
sizeof(struct request_queue), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
3542 |
|
18fbda91c block: use same b... |
3543 3544 3545 |
#ifdef CONFIG_DEBUG_FS blk_debugfs_root = debugfs_create_dir("block", NULL); #endif |
d38ecf935 io context sharin... |
3546 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3547 |
} |