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block/blk-core.c
105 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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#include <linux/bpf.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-rq-qos.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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/** * blk_queue_flag_set - atomically set a queue flag * @flag: flag to be set * @q: request queue */ void blk_queue_flag_set(unsigned int flag, struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); queue_flag_set(flag, q); spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_queue_flag_set); /** * blk_queue_flag_clear - atomically clear a queue flag * @flag: flag to be cleared * @q: request queue */ void blk_queue_flag_clear(unsigned int flag, struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); queue_flag_clear(flag, q); spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_queue_flag_clear); /** * blk_queue_flag_test_and_set - atomically test and set a queue flag * @flag: flag to be set * @q: request queue * * Returns the previous value of @flag - 0 if the flag was not set and 1 if * the flag was already set. */ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q) { unsigned long flags; bool res; spin_lock_irqsave(q->queue_lock, flags); res = queue_flag_test_and_set(flag, q); spin_unlock_irqrestore(q->queue_lock, flags); return res; } EXPORT_SYMBOL_GPL(blk_queue_flag_test_and_set); /** * blk_queue_flag_test_and_clear - atomically test and clear a queue flag * @flag: flag to be cleared * @q: request queue * * Returns the previous value of @flag - 0 if the flag was not set and 1 if * the flag was set. */ bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q) { unsigned long flags; bool res; spin_lock_irqsave(q->queue_lock, flags); res = queue_flag_test_and_clear(flag, q); spin_unlock_irqrestore(q->queue_lock, flags); return res; } EXPORT_SYMBOL_GPL(blk_queue_flag_test_and_clear); |
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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_ns = ktime_get_ns(); |
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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_DEV_RESOURCE] = { -EBUSY, "device 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_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_set_preempt_only - set QUEUE_FLAG_PREEMPT_ONLY * @q: request queue pointer * * Returns the previous value of the PREEMPT_ONLY flag - 0 if the flag was not * set and 1 if the flag was already set. */ int blk_set_preempt_only(struct request_queue *q) { |
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return blk_queue_flag_test_and_set(QUEUE_FLAG_PREEMPT_ONLY, q); |
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} EXPORT_SYMBOL_GPL(blk_set_preempt_only); void blk_clear_preempt_only(struct request_queue *q) { |
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430 |
blk_queue_flag_clear(QUEUE_FLAG_PREEMPT_ONLY, q); |
3a0a52997 block, scsi: Make... |
431 |
wake_up_all(&q->mq_freeze_wq); |
c9254f2dd block: Add the QU... |
432 433 434 435 |
} EXPORT_SYMBOL_GPL(blk_clear_preempt_only); /** |
c246e80d8 block: Avoid that... |
436 437 438 439 440 441 442 443 444 445 446 447 |
* __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) { |
2fff8a924 block: Check lock... |
448 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
449 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
450 |
|
c246e80d8 block: Avoid that... |
451 452 |
if (unlikely(blk_queue_dead(q))) return; |
24faf6f60 block: Make blk_c... |
453 454 455 456 457 458 459 460 |
/* * 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++; |
c246e80d8 block: Avoid that... |
461 |
q->request_fn(q); |
24faf6f60 block: Make blk_c... |
462 |
q->request_fn_active--; |
c246e80d8 block: Avoid that... |
463 |
} |
a7928c157 block: move PM re... |
464 |
EXPORT_SYMBOL_GPL(__blk_run_queue_uncond); |
c246e80d8 block: Avoid that... |
465 466 |
/** |
80a4b58e3 block: only call ... |
467 |
* __blk_run_queue - run a single device queue |
1da177e4c Linux-2.6.12-rc2 |
468 |
* @q: The queue to run |
80a4b58e3 block: only call ... |
469 470 |
* * Description: |
2fff8a924 block: Check lock... |
471 |
* See @blk_run_queue. |
1da177e4c Linux-2.6.12-rc2 |
472 |
*/ |
24ecfbe27 block: add blk_ru... |
473 |
void __blk_run_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
474 |
{ |
2fff8a924 block: Check lock... |
475 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
476 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
477 |
|
a538cd03b block: merge blk_... |
478 479 |
if (unlikely(blk_queue_stopped(q))) return; |
c246e80d8 block: Avoid that... |
480 |
__blk_run_queue_uncond(q); |
75ad23bc0 block: make queue... |
481 482 |
} EXPORT_SYMBOL(__blk_run_queue); |
dac07ec12 [BLOCK] limit req... |
483 |
|
75ad23bc0 block: make queue... |
484 |
/** |
24ecfbe27 block: add blk_ru... |
485 486 487 488 489 |
* 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... |
490 491 492 493 494 495 |
* 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... |
496 497 498 |
*/ void blk_run_queue_async(struct request_queue *q) { |
2fff8a924 block: Check lock... |
499 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
500 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
501 |
|
704605711 block: Avoid sche... |
502 |
if (likely(!blk_queue_stopped(q) && !blk_queue_dead(q))) |
e7c2f9674 workqueue: use mo... |
503 |
mod_delayed_work(kblockd_workqueue, &q->delay_work, 0); |
24ecfbe27 block: add blk_ru... |
504 |
} |
c21e6beba block: get rid of... |
505 |
EXPORT_SYMBOL(blk_run_queue_async); |
24ecfbe27 block: add blk_ru... |
506 507 |
/** |
75ad23bc0 block: make queue... |
508 509 |
* blk_run_queue - run a single device queue * @q: The queue to run |
80a4b58e3 block: only call ... |
510 511 512 |
* * Description: * Invoke request handling on this queue, if it has pending work to do. |
a7f557923 block: kill blk_s... |
513 |
* May be used to restart queueing when a request has completed. |
75ad23bc0 block: make queue... |
514 515 516 517 |
*/ void blk_run_queue(struct request_queue *q) { unsigned long flags; |
332ebbf7f block: Document w... |
518 |
WARN_ON_ONCE(q->mq_ops); |
75ad23bc0 block: make queue... |
519 |
spin_lock_irqsave(q->queue_lock, flags); |
24ecfbe27 block: add blk_ru... |
520 |
__blk_run_queue(q); |
1da177e4c Linux-2.6.12-rc2 |
521 522 523 |
spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_run_queue); |
165125e1e [BLOCK] Get rid o... |
524 |
void blk_put_queue(struct request_queue *q) |
483f4afc4 [PATCH] fix sysfs... |
525 526 527 |
{ kobject_put(&q->kobj); } |
d86e0e83b block: export blk... |
528 |
EXPORT_SYMBOL(blk_put_queue); |
483f4afc4 [PATCH] fix sysfs... |
529 |
|
e3c78ca52 block: reorganize... |
530 |
/** |
807592a4f block: Let blk_dr... |
531 |
* __blk_drain_queue - drain requests from request_queue |
e3c78ca52 block: reorganize... |
532 |
* @q: queue to drain |
c9a929dde block: fix reques... |
533 |
* @drain_all: whether to drain all requests or only the ones w/ ELVPRIV |
e3c78ca52 block: reorganize... |
534 |
* |
c9a929dde block: fix reques... |
535 536 537 |
* 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... |
538 |
*/ |
807592a4f block: Let blk_dr... |
539 540 541 |
static void __blk_drain_queue(struct request_queue *q, bool drain_all) __releases(q->queue_lock) __acquires(q->queue_lock) |
e3c78ca52 block: reorganize... |
542 |
{ |
458f27a98 block: Avoid miss... |
543 |
int i; |
807592a4f block: Let blk_dr... |
544 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
545 |
WARN_ON_ONCE(q->mq_ops); |
807592a4f block: Let blk_dr... |
546 |
|
e3c78ca52 block: reorganize... |
547 |
while (true) { |
481a7d647 block: fix drain_... |
548 |
bool drain = false; |
e3c78ca52 block: reorganize... |
549 |
|
b855b04a0 block: blk-thrott... |
550 551 552 553 554 555 |
/* * The caller might be trying to drain @q before its * elevator is initialized. */ if (q->elevator) elv_drain_elevator(q); |
5efd61135 blkcg: add blkcg_... |
556 |
blkcg_drain_queue(q); |
e3c78ca52 block: reorganize... |
557 |
|
4eabc9412 block: don't kick... |
558 559 |
/* * This function might be called on a queue which failed |
b855b04a0 block: blk-thrott... |
560 561 562 563 |
* 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... |
564 |
*/ |
b855b04a0 block: blk-thrott... |
565 |
if (!list_empty(&q->queue_head) && q->request_fn) |
4eabc9412 block: don't kick... |
566 |
__blk_run_queue(q); |
c9a929dde block: fix reques... |
567 |
|
8a5ecdd42 block: add q->nr_... |
568 |
drain |= q->nr_rqs_elvpriv; |
24faf6f60 block: Make blk_c... |
569 |
drain |= q->request_fn_active; |
481a7d647 block: fix drain_... |
570 571 572 573 574 575 576 |
/* * 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 ... |
577 |
struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); |
481a7d647 block: fix drain_... |
578 579 |
drain |= !list_empty(&q->queue_head); for (i = 0; i < 2; i++) { |
8a5ecdd42 block: add q->nr_... |
580 |
drain |= q->nr_rqs[i]; |
481a7d647 block: fix drain_... |
581 |
drain |= q->in_flight[i]; |
7c94e1c15 block: introduce ... |
582 583 |
if (fq) drain |= !list_empty(&fq->flush_queue[i]); |
481a7d647 block: fix drain_... |
584 585 |
} } |
e3c78ca52 block: reorganize... |
586 |
|
481a7d647 block: fix drain_... |
587 |
if (!drain) |
e3c78ca52 block: reorganize... |
588 |
break; |
807592a4f block: Let blk_dr... |
589 590 |
spin_unlock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
591 |
msleep(10); |
807592a4f block: Let blk_dr... |
592 593 |
spin_lock_irq(q->queue_lock); |
e3c78ca52 block: reorganize... |
594 |
} |
458f27a98 block: Avoid miss... |
595 596 597 598 599 600 601 |
/* * 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 ... |
602 |
struct request_list *rl; |
a051661ca blkcg: implement ... |
603 604 605 |
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... |
606 |
} |
e3c78ca52 block: reorganize... |
607 |
} |
454be724f block: drain queu... |
608 609 610 611 612 613 |
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... |
614 |
/** |
d732580b4 block: implement ... |
615 616 617 618 619 |
* 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... |
620 |
* throttled or issued before. On return, it's guaranteed that no request |
80fd99792 blkcg: make sure ... |
621 622 |
* is being throttled or has ELVPRIV set and blk_queue_bypass() %true * inside queue or RCU read lock. |
d732580b4 block: implement ... |
623 624 625 |
*/ void blk_queue_bypass_start(struct request_queue *q) { |
332ebbf7f block: Document w... |
626 |
WARN_ON_ONCE(q->mq_ops); |
d732580b4 block: implement ... |
627 |
spin_lock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
628 |
q->bypass_depth++; |
d732580b4 block: implement ... |
629 630 |
queue_flag_set(QUEUE_FLAG_BYPASS, q); spin_unlock_irq(q->queue_lock); |
776687bce block, blk-mq: dr... |
631 632 633 634 635 636 |
/* * 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... |
637 638 639 |
spin_lock_irq(q->queue_lock); __blk_drain_queue(q, false); spin_unlock_irq(q->queue_lock); |
b82d4b197 blkcg: make reque... |
640 641 642 |
/* ensure blk_queue_bypass() is %true inside RCU read lock */ synchronize_rcu(); } |
d732580b4 block: implement ... |
643 644 645 646 647 648 649 650 |
} 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... |
651 652 653 |
* * 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 ... |
654 655 656 657 658 659 660 661 662 663 |
*/ 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... |
664 665 |
void blk_set_queue_dying(struct request_queue *q) { |
8814ce8a0 block: Introduce ... |
666 |
blk_queue_flag_set(QUEUE_FLAG_DYING, q); |
aed3ea94b block: wake up wa... |
667 |
|
d3cfb2a0a block: block new ... |
668 669 670 671 672 673 |
/* * 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... |
674 675 676 677 |
if (q->mq_ops) blk_mq_wake_waiters(q); else { struct request_list *rl; |
bbfc3c5d6 block: queue lock... |
678 |
spin_lock_irq(q->queue_lock); |
aed3ea94b block: wake up wa... |
679 680 |
blk_queue_for_each_rl(rl, q) { if (rl->rq_pool) { |
34d9715ac block: wake up al... |
681 682 |
wake_up_all(&rl->wait[BLK_RW_SYNC]); wake_up_all(&rl->wait[BLK_RW_ASYNC]); |
aed3ea94b block: wake up wa... |
683 684 |
} } |
bbfc3c5d6 block: queue lock... |
685 |
spin_unlock_irq(q->queue_lock); |
aed3ea94b block: wake up wa... |
686 |
} |
055f6e18e block: Make q_usa... |
687 688 689 |
/* Make blk_queue_enter() reexamine the DYING flag. */ wake_up_all(&q->mq_freeze_wq); |
aed3ea94b block: wake up wa... |
690 691 |
} EXPORT_SYMBOL_GPL(blk_set_queue_dying); |
4cf6324b1 block: Introduce ... |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
/* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */ void blk_exit_queue(struct request_queue *q) { /* * Since the I/O scheduler exit code may access cgroup information, * perform I/O scheduler exit before disassociating from the block * cgroup controller. */ if (q->elevator) { ioc_clear_queue(q); elevator_exit(q, q->elevator); q->elevator = NULL; } /* * Remove all references to @q from the block cgroup controller before * restoring @q->queue_lock to avoid that restoring this pointer causes * e.g. blkcg_print_blkgs() to crash. */ blkcg_exit_queue(q); /* * Since the cgroup code may dereference the @q->backing_dev_info * pointer, only decrease its reference count after having removed the * association with the block cgroup controller. */ bdi_put(q->backing_dev_info); } |
d732580b4 block: implement ... |
720 |
/** |
c9a929dde block: fix reques... |
721 722 723 |
* blk_cleanup_queue - shutdown a request queue * @q: request queue to shutdown * |
c246e80d8 block: Avoid that... |
724 725 |
* 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... |
726 |
*/ |
6728cb0e6 block: make core ... |
727 |
void blk_cleanup_queue(struct request_queue *q) |
483f4afc4 [PATCH] fix sysfs... |
728 |
{ |
c9a929dde block: fix reques... |
729 |
spinlock_t *lock = q->queue_lock; |
e3335de94 block: blk_cleanu... |
730 |
|
3f3299d5c block: Rename que... |
731 |
/* mark @q DYING, no new request or merges will be allowed afterwards */ |
483f4afc4 [PATCH] fix sysfs... |
732 |
mutex_lock(&q->sysfs_lock); |
aed3ea94b block: wake up wa... |
733 |
blk_set_queue_dying(q); |
c9a929dde block: fix reques... |
734 |
spin_lock_irq(lock); |
6ecf23afa block: extend que... |
735 |
|
80fd99792 blkcg: make sure ... |
736 |
/* |
3f3299d5c block: Rename que... |
737 |
* A dying queue is permanently in bypass mode till released. Note |
80fd99792 blkcg: make sure ... |
738 739 740 741 742 743 744 |
* 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... |
745 746 |
q->bypass_depth++; queue_flag_set(QUEUE_FLAG_BYPASS, q); |
c9a929dde block: fix reques... |
747 748 |
queue_flag_set(QUEUE_FLAG_NOMERGES, q); queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
3f3299d5c block: Rename que... |
749 |
queue_flag_set(QUEUE_FLAG_DYING, q); |
c9a929dde block: fix reques... |
750 751 |
spin_unlock_irq(lock); mutex_unlock(&q->sysfs_lock); |
c246e80d8 block: Avoid that... |
752 753 754 755 |
/* * 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... |
756 |
blk_freeze_queue(q); |
9c1051aac blk-mq: untangle ... |
757 |
spin_lock_irq(lock); |
c246e80d8 block: Avoid that... |
758 |
queue_flag_set(QUEUE_FLAG_DEAD, q); |
807592a4f block: Let blk_dr... |
759 |
spin_unlock_irq(lock); |
c9a929dde block: fix reques... |
760 |
|
c2856ae2f blk-mq: quiesce q... |
761 762 763 764 |
/* * 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 |
1311326cf blk-mq: avoid to ... |
765 766 |
* from more than one contexts. * |
410306a0f SCSI: fix queue c... |
767 768 |
* We rely on driver to deal with the race in case that queue * initialization isn't done. |
c2856ae2f blk-mq: quiesce q... |
769 |
*/ |
1311326cf blk-mq: avoid to ... |
770 |
if (q->mq_ops && blk_queue_init_done(q)) |
c2856ae2f blk-mq: quiesce q... |
771 |
blk_mq_quiesce_queue(q); |
5a48fc147 block: blk_flush_... |
772 773 |
/* for synchronous bio-based driver finish in-flight integrity i/o */ blk_flush_integrity(); |
c9a929dde block: fix reques... |
774 |
/* @q won't process any more request, flush async actions */ |
dc3b17cc8 block: Use pointe... |
775 |
del_timer_sync(&q->backing_dev_info->laptop_mode_wb_timer); |
c9a929dde block: fix reques... |
776 |
blk_sync_queue(q); |
a063057d7 block: Fix a race... |
777 778 779 780 781 |
/* * I/O scheduler exit is only safe after the sysfs scheduler attribute * has been removed. */ WARN_ON_ONCE(q->kobj.state_in_sysfs); |
4cf6324b1 block: Introduce ... |
782 |
blk_exit_queue(q); |
a063057d7 block: Fix a race... |
783 |
|
45a9c9d90 blk-mq: Fix a use... |
784 785 |
if (q->mq_ops) blk_mq_free_queue(q); |
3ef28e83a block: generic re... |
786 |
percpu_ref_exit(&q->q_usage_counter); |
45a9c9d90 blk-mq: Fix a use... |
787 |
|
5e5cfac0c block: Mitigate l... |
788 789 790 791 |
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... |
792 |
/* @q is and will stay empty, shutdown and put */ |
483f4afc4 [PATCH] fix sysfs... |
793 794 |
blk_put_queue(q); } |
1da177e4c Linux-2.6.12-rc2 |
795 |
EXPORT_SYMBOL(blk_cleanup_queue); |
271508dba block: allocate r... |
796 |
/* Allocate memory local to the request queue */ |
6d247d7f7 block: allow spec... |
797 |
static void *alloc_request_simple(gfp_t gfp_mask, void *data) |
271508dba block: allocate r... |
798 |
{ |
6d247d7f7 block: allow spec... |
799 800 801 |
struct request_queue *q = data; return kmem_cache_alloc_node(request_cachep, gfp_mask, q->node); |
271508dba block: allocate r... |
802 |
} |
6d247d7f7 block: allow spec... |
803 |
static void free_request_simple(void *element, void *data) |
271508dba block: allocate r... |
804 805 806 |
{ kmem_cache_free(request_cachep, element); } |
6d247d7f7 block: allow spec... |
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 |
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... |
829 830 |
int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
831 |
{ |
85acb3ba2 block: set reques... |
832 |
if (unlikely(rl->rq_pool) || q->mq_ops) |
1abec4fdb block: make blk_i... |
833 |
return 0; |
5b788ce3e block: prepare fo... |
834 |
rl->q = q; |
1faa16d22 block: change the... |
835 836 |
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... |
837 838 |
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]); init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]); |
1da177e4c Linux-2.6.12-rc2 |
839 |
|
6d247d7f7 block: allow spec... |
840 841 842 843 844 845 846 847 848 |
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 |
849 850 |
if (!rl->rq_pool) return -ENOMEM; |
b425e5049 block: Avoid that... |
851 852 |
if (rl != &q->root_rl) WARN_ON_ONCE(!blk_get_queue(q)); |
1da177e4c Linux-2.6.12-rc2 |
853 854 |
return 0; } |
b425e5049 block: Avoid that... |
855 |
void blk_exit_rl(struct request_queue *q, struct request_list *rl) |
5b788ce3e block: prepare fo... |
856 |
{ |
b425e5049 block: Avoid that... |
857 |
if (rl->rq_pool) { |
5b788ce3e block: prepare fo... |
858 |
mempool_destroy(rl->rq_pool); |
b425e5049 block: Avoid that... |
859 860 861 |
if (rl != &q->root_rl) blk_put_queue(q); } |
5b788ce3e block: prepare fo... |
862 |
} |
165125e1e [BLOCK] Get rid o... |
863 |
struct request_queue *blk_alloc_queue(gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
864 |
{ |
5ee0524ba block: Add 'lock'... |
865 |
return blk_alloc_queue_node(gfp_mask, NUMA_NO_NODE, NULL); |
1946089a1 [PATCH] NUMA awar... |
866 867 |
} EXPORT_SYMBOL(blk_alloc_queue); |
1da177e4c Linux-2.6.12-rc2 |
868 |
|
3a0a52997 block, scsi: Make... |
869 870 871 872 873 |
/** * blk_queue_enter() - try to increase q->q_usage_counter * @q: request queue pointer * @flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT */ |
9a95e4ef7 block, nvme: Intr... |
874 |
int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) |
3ef28e83a block: generic re... |
875 |
{ |
3a0a52997 block, scsi: Make... |
876 |
const bool preempt = flags & BLK_MQ_REQ_PREEMPT; |
3ef28e83a block: generic re... |
877 |
while (true) { |
3a0a52997 block, scsi: Make... |
878 |
bool success = false; |
3ef28e83a block: generic re... |
879 |
|
818e0fa29 block: Change a r... |
880 |
rcu_read_lock(); |
3a0a52997 block, scsi: Make... |
881 882 883 884 885 886 887 888 889 890 891 892 |
if (percpu_ref_tryget_live(&q->q_usage_counter)) { /* * The code that sets the PREEMPT_ONLY flag is * responsible for ensuring that that flag is globally * visible before the queue is unfrozen. */ if (preempt || !blk_queue_preempt_only(q)) { success = true; } else { percpu_ref_put(&q->q_usage_counter); } } |
818e0fa29 block: Change a r... |
893 |
rcu_read_unlock(); |
3a0a52997 block, scsi: Make... |
894 895 |
if (success) |
3ef28e83a block: generic re... |
896 |
return 0; |
3a0a52997 block, scsi: Make... |
897 |
if (flags & BLK_MQ_REQ_NOWAIT) |
3ef28e83a block: generic re... |
898 |
return -EBUSY; |
5ed61d3f0 block: add a read... |
899 |
/* |
1671d522c block: rename blk... |
900 |
* read pair of barrier in blk_freeze_queue_start(), |
5ed61d3f0 block: add a read... |
901 |
* we need to order reading __PERCPU_REF_DEAD flag of |
d3cfb2a0a block: block new ... |
902 903 904 |
* .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... |
905 906 |
*/ smp_rmb(); |
1dc3039bc block: do not use... |
907 908 909 910 |
wait_event(q->mq_freeze_wq, (atomic_read(&q->mq_freeze_depth) == 0 && (preempt || !blk_queue_preempt_only(q))) || blk_queue_dying(q)); |
3ef28e83a block: generic re... |
911 912 |
if (blk_queue_dying(q)) return -ENODEV; |
3ef28e83a block: generic re... |
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 |
} } 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); } |
bca237a52 block/laptop_mode... |
928 |
static void blk_rq_timed_out_timer(struct timer_list *t) |
287922eb0 block: defer time... |
929 |
{ |
bca237a52 block/laptop_mode... |
930 |
struct request_queue *q = from_timer(q, t, timeout); |
287922eb0 block: defer time... |
931 932 933 |
kblockd_schedule_work(&q->timeout_work); } |
498f6650a block: Fix a race... |
934 935 936 937 938 939 940 941 942 943 944 945 946 |
/** * blk_alloc_queue_node - allocate a request queue * @gfp_mask: memory allocation flags * @node_id: NUMA node to allocate memory from * @lock: For legacy queues, pointer to a spinlock that will be used to e.g. * serialize calls to the legacy .request_fn() callback. Ignored for * blk-mq request queues. * * Note: pass the queue lock as the third argument to this function instead of * setting the queue lock pointer explicitly to avoid triggering a sporadic * crash in the blkcg code. This function namely calls blkcg_init_queue() and * the queue lock pointer must be set before blkcg_init_queue() is called. */ |
5ee0524ba block: Add 'lock'... |
947 948 |
struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, spinlock_t *lock) |
1946089a1 [PATCH] NUMA awar... |
949 |
{ |
165125e1e [BLOCK] Get rid o... |
950 |
struct request_queue *q; |
338aa96d5 block: convert bo... |
951 |
int ret; |
1946089a1 [PATCH] NUMA awar... |
952 |
|
8324aa91d block: split tag ... |
953 |
q = kmem_cache_alloc_node(blk_requestq_cachep, |
94f6030ca Slab allocators: ... |
954 |
gfp_mask | __GFP_ZERO, node_id); |
1da177e4c Linux-2.6.12-rc2 |
955 956 |
if (!q) return NULL; |
cbf62af35 block: move initi... |
957 958 959 960 |
INIT_LIST_HEAD(&q->queue_head); q->last_merge = NULL; q->end_sector = 0; q->boundary_rq = NULL; |
00380a404 block: blk_alloc_... |
961 |
q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask); |
a73f730d0 block, cfq: move ... |
962 |
if (q->id < 0) |
3d2936f45 block: only alloc... |
963 |
goto fail_q; |
a73f730d0 block, cfq: move ... |
964 |
|
338aa96d5 block: convert bo... |
965 966 |
ret = bioset_init(&q->bio_split, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); if (ret) |
54efd50bf block: make gener... |
967 |
goto fail_id; |
d03f6cdc1 block: Dynamicall... |
968 969 970 |
q->backing_dev_info = bdi_alloc_node(gfp_mask, node_id); if (!q->backing_dev_info) goto fail_split; |
a83b576c9 block: fix stacke... |
971 972 973 |
q->stats = blk_alloc_queue_stats(); if (!q->stats) goto fail_stats; |
dc3b17cc8 block: Use pointe... |
974 |
q->backing_dev_info->ra_pages = |
09cbfeaf1 mm, fs: get rid o... |
975 |
(VM_MAX_READAHEAD * 1024) / PAGE_SIZE; |
dc3b17cc8 block: Use pointe... |
976 977 |
q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK; q->backing_dev_info->name = "block"; |
5151412dd block: initialize... |
978 |
q->node = node_id; |
0989a025d block: don't over... |
979 |
|
bca237a52 block/laptop_mode... |
980 981 982 |
timer_setup(&q->backing_dev_info->laptop_mode_wb_timer, laptop_mode_timer_fn, 0); timer_setup(&q->timeout, blk_rq_timed_out_timer, 0); |
4e9b6f208 block: Fix a race... |
983 |
INIT_WORK(&q->timeout_work, NULL); |
242f9dcb8 block: unify requ... |
984 |
INIT_LIST_HEAD(&q->timeout_list); |
a612fddf0 block, cfq: move ... |
985 |
INIT_LIST_HEAD(&q->icq_list); |
4eef30499 blkcg: move per-q... |
986 |
#ifdef CONFIG_BLK_CGROUP |
e8989fae3 blkcg: unify blkg... |
987 |
INIT_LIST_HEAD(&q->blkg_list); |
4eef30499 blkcg: move per-q... |
988 |
#endif |
3cca6dc1c block: add API fo... |
989 |
INIT_DELAYED_WORK(&q->delay_work, blk_delay_work); |
483f4afc4 [PATCH] fix sysfs... |
990 |
|
8324aa91d block: split tag ... |
991 |
kobject_init(&q->kobj, &blk_queue_ktype); |
1da177e4c Linux-2.6.12-rc2 |
992 |
|
5acb3cc2c blktrace: Fix pot... |
993 994 995 |
#ifdef CONFIG_BLK_DEV_IO_TRACE mutex_init(&q->blk_trace_mutex); #endif |
483f4afc4 [PATCH] fix sysfs... |
996 |
mutex_init(&q->sysfs_lock); |
e7e72bf64 Remove blkdev war... |
997 |
spin_lock_init(&q->__queue_lock); |
483f4afc4 [PATCH] fix sysfs... |
998 |
|
498f6650a block: Fix a race... |
999 1000 |
if (!q->mq_ops) q->queue_lock = lock ? : &q->__queue_lock; |
c94a96ac9 block: Initialize... |
1001 |
|
b82d4b197 blkcg: make reque... |
1002 1003 1004 |
/* * 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... |
1005 1006 |
* init. The initial bypass will be finished when the queue is * registered by blk_register_queue(). |
b82d4b197 blkcg: make reque... |
1007 1008 |
*/ q->bypass_depth = 1; |
f78bac2c8 block: Use the qu... |
1009 |
queue_flag_set_unlocked(QUEUE_FLAG_BYPASS, q); |
b82d4b197 blkcg: make reque... |
1010 |
|
320ae51fe blk-mq: new multi... |
1011 |
init_waitqueue_head(&q->mq_freeze_wq); |
3ef28e83a block: generic re... |
1012 1013 1014 1015 1016 1017 1018 |
/* * 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... |
1019 |
goto fail_bdi; |
f51b802c1 blkcg: use the us... |
1020 |
|
3ef28e83a block: generic re... |
1021 1022 |
if (blkcg_init_queue(q)) goto fail_ref; |
1da177e4c Linux-2.6.12-rc2 |
1023 |
return q; |
a73f730d0 block, cfq: move ... |
1024 |
|
3ef28e83a block: generic re... |
1025 1026 |
fail_ref: percpu_ref_exit(&q->q_usage_counter); |
fff4996b7 blk-core: Fix mem... |
1027 |
fail_bdi: |
a83b576c9 block: fix stacke... |
1028 1029 |
blk_free_queue_stats(q->stats); fail_stats: |
d03f6cdc1 block: Dynamicall... |
1030 |
bdi_put(q->backing_dev_info); |
54efd50bf block: make gener... |
1031 |
fail_split: |
338aa96d5 block: convert bo... |
1032 |
bioset_exit(&q->bio_split); |
a73f730d0 block, cfq: move ... |
1033 1034 1035 1036 1037 |
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 |
1038 |
} |
1946089a1 [PATCH] NUMA awar... |
1039 |
EXPORT_SYMBOL(blk_alloc_queue_node); |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 |
/** * 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... |
1063 1064 |
* request queue; this lock will be taken also from interrupt context, so irq * disabling is needed for it. |
1da177e4c Linux-2.6.12-rc2 |
1065 |
* |
710027a48 Add some block/ s... |
1066 |
* Function returns a pointer to the initialized request queue, or %NULL if |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 1069 1070 1071 1072 |
* 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... |
1073 |
|
165125e1e [BLOCK] Get rid o... |
1074 |
struct request_queue *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock) |
1da177e4c Linux-2.6.12-rc2 |
1075 |
{ |
c304a51bf block: use NUMA_N... |
1076 |
return blk_init_queue_node(rfn, lock, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
1077 1078 |
} EXPORT_SYMBOL(blk_init_queue); |
165125e1e [BLOCK] Get rid o... |
1079 |
struct request_queue * |
1946089a1 [PATCH] NUMA awar... |
1080 1081 |
blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { |
5ea708d15 block: simplify b... |
1082 |
struct request_queue *q; |
1da177e4c Linux-2.6.12-rc2 |
1083 |
|
498f6650a block: Fix a race... |
1084 |
q = blk_alloc_queue_node(GFP_KERNEL, node_id, lock); |
5ea708d15 block: simplify b... |
1085 |
if (!q) |
c86d1b8ae block: avoid unco... |
1086 |
return NULL; |
5ea708d15 block: simplify b... |
1087 |
q->request_fn = rfn; |
5ea708d15 block: simplify b... |
1088 1089 1090 1091 |
if (blk_init_allocated_queue(q) < 0) { blk_cleanup_queue(q); return NULL; } |
18741986a blk-mq: rework fl... |
1092 |
|
7982e90c3 block: fix q->flu... |
1093 |
return q; |
01effb0dc block: allow init... |
1094 1095 |
} EXPORT_SYMBOL(blk_init_queue_node); |
dece16353 block: change ->m... |
1096 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio); |
336b7e1f2 block: remove exp... |
1097 |
|
1da177e4c Linux-2.6.12-rc2 |
1098 |
|
5ea708d15 block: simplify b... |
1099 1100 |
int blk_init_allocated_queue(struct request_queue *q) { |
332ebbf7f block: Document w... |
1101 |
WARN_ON_ONCE(q->mq_ops); |
6d247d7f7 block: allow spec... |
1102 |
q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, q->cmd_size); |
ba483388e block: remove blk... |
1103 |
if (!q->fq) |
5ea708d15 block: simplify b... |
1104 |
return -ENOMEM; |
7982e90c3 block: fix q->flu... |
1105 |
|
6d247d7f7 block: allow spec... |
1106 1107 |
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... |
1108 |
|
a051661ca blkcg: implement ... |
1109 |
if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) |
6d247d7f7 block: allow spec... |
1110 |
goto out_exit_flush_rq; |
1da177e4c Linux-2.6.12-rc2 |
1111 |
|
287922eb0 block: defer time... |
1112 |
INIT_WORK(&q->timeout_work, blk_timeout_work); |
60ea8226c block: fix reques... |
1113 |
q->queue_flags |= QUEUE_FLAG_DEFAULT; |
c94a96ac9 block: Initialize... |
1114 |
|
f3b144aa7 block: remove var... |
1115 1116 1117 |
/* * This also sets hw/phys segments, boundary and size */ |
c20e8de27 block: rename __m... |
1118 |
blk_queue_make_request(q, blk_queue_bio); |
1da177e4c Linux-2.6.12-rc2 |
1119 |
|
44ec95425 [SCSI] sg: cap re... |
1120 |
q->sg_reserved_size = INT_MAX; |
acddf3b30 block: move sysfs... |
1121 |
if (elevator_init(q)) |
6d247d7f7 block: allow spec... |
1122 |
goto out_exit_flush_rq; |
5ea708d15 block: simplify b... |
1123 |
return 0; |
eb1c160b2 elevator: Fix a r... |
1124 |
|
6d247d7f7 block: allow spec... |
1125 1126 1127 1128 |
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... |
1129 |
blk_free_flush_queue(q->fq); |
54648cf1e block: blk_init_a... |
1130 |
q->fq = NULL; |
5ea708d15 block: simplify b... |
1131 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
} |
5151412dd block: initialize... |
1133 |
EXPORT_SYMBOL(blk_init_allocated_queue); |
1da177e4c Linux-2.6.12-rc2 |
1134 |
|
09ac46c42 block: misc updat... |
1135 |
bool blk_get_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
1136 |
{ |
3f3299d5c block: Rename que... |
1137 |
if (likely(!blk_queue_dying(q))) { |
09ac46c42 block: misc updat... |
1138 1139 |
__blk_get_queue(q); return true; |
1da177e4c Linux-2.6.12-rc2 |
1140 |
} |
09ac46c42 block: misc updat... |
1141 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
1142 |
} |
d86e0e83b block: export blk... |
1143 |
EXPORT_SYMBOL(blk_get_queue); |
1da177e4c Linux-2.6.12-rc2 |
1144 |
|
5b788ce3e block: prepare fo... |
1145 |
static inline void blk_free_request(struct request_list *rl, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1146 |
{ |
e80640213 block: split out ... |
1147 |
if (rq->rq_flags & RQF_ELVPRIV) { |
5b788ce3e block: prepare fo... |
1148 |
elv_put_request(rl->q, rq); |
f1f8cc946 block, cfq: move ... |
1149 |
if (rq->elv.icq) |
11a3122f6 block: strip out ... |
1150 |
put_io_context(rq->elv.icq->ioc); |
f1f8cc946 block, cfq: move ... |
1151 |
} |
5b788ce3e block: prepare fo... |
1152 |
mempool_free(rq, rl->rq_pool); |
1da177e4c Linux-2.6.12-rc2 |
1153 |
} |
1da177e4c Linux-2.6.12-rc2 |
1154 1155 1156 1157 |
/* * 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... |
1158 |
static inline int ioc_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
{ 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... |
1179 |
static void ioc_set_batching(struct request_queue *q, struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1180 1181 1182 1183 1184 1185 1186 |
{ if (!ioc || ioc_batching(q, ioc)) return; ioc->nr_batch_requests = q->nr_batching; ioc->last_waited = jiffies; } |
5b788ce3e block: prepare fo... |
1187 |
static void __freed_request(struct request_list *rl, int sync) |
1da177e4c Linux-2.6.12-rc2 |
1188 |
{ |
5b788ce3e block: prepare fo... |
1189 |
struct request_queue *q = rl->q; |
1da177e4c Linux-2.6.12-rc2 |
1190 |
|
d40f75a06 writeback, blkcg:... |
1191 1192 |
if (rl->count[sync] < queue_congestion_off_threshold(q)) blk_clear_congested(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1193 |
|
1faa16d22 block: change the... |
1194 1195 1196 |
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 |
1197 |
|
5b788ce3e block: prepare fo... |
1198 |
blk_clear_rl_full(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1199 1200 1201 1202 1203 1204 1205 |
} } /* * 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 ... |
1206 1207 |
static void freed_request(struct request_list *rl, bool sync, req_flags_t rq_flags) |
1da177e4c Linux-2.6.12-rc2 |
1208 |
{ |
5b788ce3e block: prepare fo... |
1209 |
struct request_queue *q = rl->q; |
1da177e4c Linux-2.6.12-rc2 |
1210 |
|
8a5ecdd42 block: add q->nr_... |
1211 |
q->nr_rqs[sync]--; |
1faa16d22 block: change the... |
1212 |
rl->count[sync]--; |
e80640213 block: split out ... |
1213 |
if (rq_flags & RQF_ELVPRIV) |
8a5ecdd42 block: add q->nr_... |
1214 |
q->nr_rqs_elvpriv--; |
1da177e4c Linux-2.6.12-rc2 |
1215 |
|
5b788ce3e block: prepare fo... |
1216 |
__freed_request(rl, sync); |
1da177e4c Linux-2.6.12-rc2 |
1217 |
|
1faa16d22 block: change the... |
1218 |
if (unlikely(rl->starved[sync ^ 1])) |
5b788ce3e block: prepare fo... |
1219 |
__freed_request(rl, sync ^ 1); |
1da177e4c Linux-2.6.12-rc2 |
1220 |
} |
e3a2b3f93 blk-mq: allow cha... |
1221 1222 1223 |
int blk_update_nr_requests(struct request_queue *q, unsigned int nr) { struct request_list *rl; |
d40f75a06 writeback, blkcg:... |
1224 |
int on_thresh, off_thresh; |
e3a2b3f93 blk-mq: allow cha... |
1225 |
|
332ebbf7f block: Document w... |
1226 |
WARN_ON_ONCE(q->mq_ops); |
e3a2b3f93 blk-mq: allow cha... |
1227 1228 1229 |
spin_lock_irq(q->queue_lock); q->nr_requests = nr; blk_queue_congestion_threshold(q); |
d40f75a06 writeback, blkcg:... |
1230 1231 |
on_thresh = queue_congestion_on_threshold(q); off_thresh = queue_congestion_off_threshold(q); |
e3a2b3f93 blk-mq: allow cha... |
1232 |
|
d40f75a06 writeback, blkcg:... |
1233 1234 1235 1236 1237 |
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... |
1238 |
|
d40f75a06 writeback, blkcg:... |
1239 1240 1241 1242 |
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... |
1243 |
|
e3a2b3f93 blk-mq: allow cha... |
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 |
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... |
1262 |
/** |
a06e05e6a block: refactor g... |
1263 |
* __get_request - get a free request |
5b788ce3e block: prepare fo... |
1264 |
* @rl: request list to allocate from |
ef295ecf0 block: better op ... |
1265 |
* @op: operation and flags |
da8303c63 block: make get_r... |
1266 |
* @bio: bio to allocate request for (can be %NULL) |
6a15674d1 block: Introduce ... |
1267 |
* @flags: BLQ_MQ_REQ_* flags |
4accf5fc7 block: pass an ex... |
1268 |
* @gfp_mask: allocator flags |
da8303c63 block: make get_r... |
1269 1270 1271 1272 |
* * Get a free request from @q. This function may fail under memory * pressure or if @q is dead. * |
da3dae54e Documentation: Do... |
1273 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1274 1275 |
* 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 |
1276 |
*/ |
ef295ecf0 block: better op ... |
1277 |
static struct request *__get_request(struct request_list *rl, unsigned int op, |
4accf5fc7 block: pass an ex... |
1278 |
struct bio *bio, blk_mq_req_flags_t flags, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1279 |
{ |
5b788ce3e block: prepare fo... |
1280 |
struct request_queue *q = rl->q; |
b679281a6 block: restructur... |
1281 |
struct request *rq; |
7f4b35d15 block: allocate i... |
1282 1283 |
struct elevator_type *et = q->elevator->type; struct io_context *ioc = rq_ioc(bio); |
f1f8cc946 block, cfq: move ... |
1284 |
struct io_cq *icq = NULL; |
ef295ecf0 block: better op ... |
1285 |
const bool is_sync = op_is_sync(op); |
75eb6c372 block: pass aroun... |
1286 |
int may_queue; |
e80640213 block: split out ... |
1287 |
req_flags_t rq_flags = RQF_ALLOCED; |
88ee5ef15 [BLOCK] ll_rw_blk... |
1288 |
|
2fff8a924 block: Check lock... |
1289 |
lockdep_assert_held(q->queue_lock); |
3f3299d5c block: Rename que... |
1290 |
if (unlikely(blk_queue_dying(q))) |
a492f0754 block,scsi: fixup... |
1291 |
return ERR_PTR(-ENODEV); |
da8303c63 block: make get_r... |
1292 |
|
ef295ecf0 block: better op ... |
1293 |
may_queue = elv_may_queue(q, op); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1294 1295 |
if (may_queue == ELV_MQUEUE_NO) goto rq_starved; |
1faa16d22 block: change the... |
1296 1297 |
if (rl->count[is_sync]+1 >= queue_congestion_on_threshold(q)) { if (rl->count[is_sync]+1 >= q->nr_requests) { |
f2dbd76a0 block, cfq: repla... |
1298 |
/* |
88ee5ef15 [BLOCK] ll_rw_blk... |
1299 1300 1301 1302 1303 |
* 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... |
1304 |
if (!blk_rl_full(rl, is_sync)) { |
88ee5ef15 [BLOCK] ll_rw_blk... |
1305 |
ioc_set_batching(q, ioc); |
5b788ce3e block: prepare fo... |
1306 |
blk_set_rl_full(rl, is_sync); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1307 1308 1309 1310 1311 1312 1313 1314 |
} 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... |
1315 |
return ERR_PTR(-ENOMEM); |
88ee5ef15 [BLOCK] ll_rw_blk... |
1316 1317 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1318 |
} |
d40f75a06 writeback, blkcg:... |
1319 |
blk_set_congested(rl, is_sync); |
1da177e4c Linux-2.6.12-rc2 |
1320 |
} |
082cf69eb [PATCH] ll_rw_blk... |
1321 1322 1323 1324 1325 |
/* * 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... |
1326 |
if (rl->count[is_sync] >= (3 * q->nr_requests / 2)) |
a492f0754 block,scsi: fixup... |
1327 |
return ERR_PTR(-ENOMEM); |
fd782a4a9 [PATCH] Fix get_r... |
1328 |
|
8a5ecdd42 block: add q->nr_... |
1329 |
q->nr_rqs[is_sync]++; |
1faa16d22 block: change the... |
1330 1331 |
rl->count[is_sync]++; rl->starved[is_sync] = 0; |
cb98fc8bb [BLOCK] Reimpleme... |
1332 |
|
f1f8cc946 block, cfq: move ... |
1333 1334 |
/* * Decide whether the new request will be managed by elevator. If |
e80640213 block: split out ... |
1335 |
* so, mark @rq_flags and increment elvpriv. Non-zero elvpriv will |
f1f8cc946 block, cfq: move ... |
1336 1337 1338 1339 |
* 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... |
1340 1341 1342 |
* 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 ... |
1343 1344 1345 |
* Also, lookup icq while holding queue_lock. If it doesn't exist, * it will be created after releasing queue_lock. */ |
e6f7f93d5 block: fix elevat... |
1346 |
if (!op_is_flush(op) && !blk_queue_bypass(q)) { |
e80640213 block: split out ... |
1347 |
rq_flags |= RQF_ELVPRIV; |
8a5ecdd42 block: add q->nr_... |
1348 |
q->nr_rqs_elvpriv++; |
f1f8cc946 block, cfq: move ... |
1349 1350 |
if (et->icq_cache && ioc) icq = ioc_lookup_icq(ioc, q); |
9d5a4e946 block: skip eleva... |
1351 |
} |
cb98fc8bb [BLOCK] Reimpleme... |
1352 |
|
f253b86b4 Revert "block: fi... |
1353 |
if (blk_queue_io_stat(q)) |
e80640213 block: split out ... |
1354 |
rq_flags |= RQF_IO_STAT; |
1da177e4c Linux-2.6.12-rc2 |
1355 |
spin_unlock_irq(q->queue_lock); |
29e2b09ab block: collapse b... |
1356 |
/* allocate and init request */ |
5b788ce3e block: prepare fo... |
1357 |
rq = mempool_alloc(rl->rq_pool, gfp_mask); |
29e2b09ab block: collapse b... |
1358 |
if (!rq) |
b679281a6 block: restructur... |
1359 |
goto fail_alloc; |
1da177e4c Linux-2.6.12-rc2 |
1360 |
|
29e2b09ab block: collapse b... |
1361 |
blk_rq_init(q, rq); |
a051661ca blkcg: implement ... |
1362 |
blk_rq_set_rl(rq, rl); |
ef295ecf0 block: better op ... |
1363 |
rq->cmd_flags = op; |
e80640213 block: split out ... |
1364 |
rq->rq_flags = rq_flags; |
1b6d65a0b block: Introduce ... |
1365 1366 |
if (flags & BLK_MQ_REQ_PREEMPT) rq->rq_flags |= RQF_PREEMPT; |
29e2b09ab block: collapse b... |
1367 |
|
aaf7c6806 block: fix elvpri... |
1368 |
/* init elvpriv */ |
e80640213 block: split out ... |
1369 |
if (rq_flags & RQF_ELVPRIV) { |
aaf7c6806 block: fix elvpri... |
1370 |
if (unlikely(et->icq_cache && !icq)) { |
7f4b35d15 block: allocate i... |
1371 1372 |
if (ioc) icq = ioc_create_icq(ioc, q, gfp_mask); |
aaf7c6806 block: fix elvpri... |
1373 1374 |
if (!icq) goto fail_elvpriv; |
29e2b09ab block: collapse b... |
1375 |
} |
aaf7c6806 block: fix elvpri... |
1376 1377 1378 1379 1380 1381 |
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... |
1382 1383 1384 |
if (icq) get_io_context(icq->ioc); } |
aaf7c6806 block: fix elvpri... |
1385 |
out: |
88ee5ef15 [BLOCK] ll_rw_blk... |
1386 1387 1388 1389 1390 1391 |
/* * 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 |
1392 1393 |
if (ioc_batching(q, ioc)) ioc->nr_batch_requests--; |
6728cb0e6 block: make core ... |
1394 |
|
e6a40b096 block: prepare re... |
1395 |
trace_block_getrq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1396 |
return rq; |
b679281a6 block: restructur... |
1397 |
|
aaf7c6806 block: fix elvpri... |
1398 1399 1400 1401 1402 1403 1404 |
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... |
1405 1406 |
printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed ", |
dc3b17cc8 block: Use pointe... |
1407 |
__func__, dev_name(q->backing_dev_info->dev)); |
aaf7c6806 block: fix elvpri... |
1408 |
|
e80640213 block: split out ... |
1409 |
rq->rq_flags &= ~RQF_ELVPRIV; |
aaf7c6806 block: fix elvpri... |
1410 1411 1412 |
rq->elv.icq = NULL; spin_lock_irq(q->queue_lock); |
8a5ecdd42 block: add q->nr_... |
1413 |
q->nr_rqs_elvpriv--; |
aaf7c6806 block: fix elvpri... |
1414 1415 |
spin_unlock_irq(q->queue_lock); goto out; |
b679281a6 block: restructur... |
1416 1417 1418 1419 1420 1421 1422 1423 1424 |
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 ... |
1425 |
freed_request(rl, is_sync, rq_flags); |
b679281a6 block: restructur... |
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 |
/* * 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... |
1437 |
return ERR_PTR(-ENOMEM); |
1da177e4c Linux-2.6.12-rc2 |
1438 |
} |
da8303c63 block: make get_r... |
1439 |
/** |
a06e05e6a block: refactor g... |
1440 |
* get_request - get a free request |
da8303c63 block: make get_r... |
1441 |
* @q: request_queue to allocate request from |
ef295ecf0 block: better op ... |
1442 |
* @op: operation and flags |
da8303c63 block: make get_r... |
1443 |
* @bio: bio to allocate request for (can be %NULL) |
6a15674d1 block: Introduce ... |
1444 |
* @flags: BLK_MQ_REQ_* flags. |
4accf5fc7 block: pass an ex... |
1445 |
* @gfp: allocator flags |
da8303c63 block: make get_r... |
1446 |
* |
a9a14d367 block: fix __get_... |
1447 |
* Get a free request from @q. If %BLK_MQ_REQ_NOWAIT is set in @flags, |
d0164adc8 mm, page_alloc: d... |
1448 |
* this function keeps retrying under memory pressure and fails iff @q is dead. |
d6344532a [PATCH] blk: redu... |
1449 |
* |
da3dae54e Documentation: Do... |
1450 |
* Must be called with @q->queue_lock held and, |
a492f0754 block,scsi: fixup... |
1451 1452 |
* 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 |
1453 |
*/ |
ef295ecf0 block: better op ... |
1454 |
static struct request *get_request(struct request_queue *q, unsigned int op, |
4accf5fc7 block: pass an ex... |
1455 |
struct bio *bio, blk_mq_req_flags_t flags, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
1456 |
{ |
ef295ecf0 block: better op ... |
1457 |
const bool is_sync = op_is_sync(op); |
a06e05e6a block: refactor g... |
1458 |
DEFINE_WAIT(wait); |
a051661ca blkcg: implement ... |
1459 |
struct request_list *rl; |
1da177e4c Linux-2.6.12-rc2 |
1460 |
struct request *rq; |
a051661ca blkcg: implement ... |
1461 |
|
2fff8a924 block: Check lock... |
1462 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
1463 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
1464 |
|
a051661ca blkcg: implement ... |
1465 |
rl = blk_get_rl(q, bio); /* transferred to @rq on success */ |
a06e05e6a block: refactor g... |
1466 |
retry: |
4accf5fc7 block: pass an ex... |
1467 |
rq = __get_request(rl, op, bio, flags, gfp); |
a492f0754 block,scsi: fixup... |
1468 |
if (!IS_ERR(rq)) |
a06e05e6a block: refactor g... |
1469 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
1470 |
|
03a07c92a block: return on ... |
1471 1472 1473 1474 |
if (op & REQ_NOWAIT) { blk_put_rl(rl); return ERR_PTR(-EAGAIN); } |
6a15674d1 block: Introduce ... |
1475 |
if ((flags & BLK_MQ_REQ_NOWAIT) || unlikely(blk_queue_dying(q))) { |
a051661ca blkcg: implement ... |
1476 |
blk_put_rl(rl); |
a492f0754 block,scsi: fixup... |
1477 |
return rq; |
a051661ca blkcg: implement ... |
1478 |
} |
1da177e4c Linux-2.6.12-rc2 |
1479 |
|
a06e05e6a block: refactor g... |
1480 1481 1482 |
/* wait on @rl and retry */ prepare_to_wait_exclusive(&rl->wait[is_sync], &wait, TASK_UNINTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1483 |
|
e6a40b096 block: prepare re... |
1484 |
trace_block_sleeprq(q, bio, op); |
1da177e4c Linux-2.6.12-rc2 |
1485 |
|
a06e05e6a block: refactor g... |
1486 1487 |
spin_unlock_irq(q->queue_lock); io_schedule(); |
d6344532a [PATCH] blk: redu... |
1488 |
|
a06e05e6a block: refactor g... |
1489 1490 1491 1492 1493 |
/* * 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... |
1494 |
ioc_set_batching(q, current->io_context); |
05caf8dbc block: Move the s... |
1495 |
|
a06e05e6a block: refactor g... |
1496 1497 |
spin_lock_irq(q->queue_lock); finish_wait(&rl->wait[is_sync], &wait); |
1da177e4c Linux-2.6.12-rc2 |
1498 |
|
a06e05e6a block: refactor g... |
1499 |
goto retry; |
1da177e4c Linux-2.6.12-rc2 |
1500 |
} |
6a15674d1 block: Introduce ... |
1501 |
/* flags: BLK_MQ_REQ_PREEMPT and/or BLK_MQ_REQ_NOWAIT. */ |
cd6ce1482 block: Make reque... |
1502 |
static struct request *blk_old_get_request(struct request_queue *q, |
9a95e4ef7 block, nvme: Intr... |
1503 |
unsigned int op, blk_mq_req_flags_t flags) |
1da177e4c Linux-2.6.12-rc2 |
1504 1505 |
{ struct request *rq; |
c3036021c block: use GFP_NO... |
1506 |
gfp_t gfp_mask = flags & BLK_MQ_REQ_NOWAIT ? GFP_ATOMIC : GFP_NOIO; |
055f6e18e block: Make q_usa... |
1507 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1508 |
|
332ebbf7f block: Document w... |
1509 |
WARN_ON_ONCE(q->mq_ops); |
7f4b35d15 block: allocate i... |
1510 1511 |
/* create ioc upfront */ create_io_context(gfp_mask, q->node); |
3a0a52997 block, scsi: Make... |
1512 |
ret = blk_queue_enter(q, flags); |
055f6e18e block: Make q_usa... |
1513 1514 |
if (ret) return ERR_PTR(ret); |
d6344532a [PATCH] blk: redu... |
1515 |
spin_lock_irq(q->queue_lock); |
4accf5fc7 block: pass an ex... |
1516 |
rq = get_request(q, op, NULL, flags, gfp_mask); |
0c4de0f33 block: ensure bio... |
1517 |
if (IS_ERR(rq)) { |
da8303c63 block: make get_r... |
1518 |
spin_unlock_irq(q->queue_lock); |
055f6e18e block: Make q_usa... |
1519 |
blk_queue_exit(q); |
0c4de0f33 block: ensure bio... |
1520 1521 |
return rq; } |
1da177e4c Linux-2.6.12-rc2 |
1522 |
|
0c4de0f33 block: ensure bio... |
1523 1524 1525 1526 |
/* 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 |
1527 1528 |
return rq; } |
320ae51fe blk-mq: new multi... |
1529 |
|
6a15674d1 block: Introduce ... |
1530 |
/** |
ff005a066 block: sanitize b... |
1531 |
* blk_get_request - allocate a request |
6a15674d1 block: Introduce ... |
1532 1533 1534 1535 |
* @q: request queue to allocate a request for * @op: operation (REQ_OP_*) and REQ_* flags, e.g. REQ_SYNC. * @flags: BLK_MQ_REQ_* flags, e.g. BLK_MQ_REQ_NOWAIT. */ |
ff005a066 block: sanitize b... |
1536 1537 |
struct request *blk_get_request(struct request_queue *q, unsigned int op, blk_mq_req_flags_t flags) |
320ae51fe blk-mq: new multi... |
1538 |
{ |
d280bab30 block: Introduce ... |
1539 |
struct request *req; |
6a15674d1 block: Introduce ... |
1540 |
WARN_ON_ONCE(op & REQ_NOWAIT); |
1b6d65a0b block: Introduce ... |
1541 |
WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PREEMPT)); |
6a15674d1 block: Introduce ... |
1542 |
|
d280bab30 block: Introduce ... |
1543 |
if (q->mq_ops) { |
6a15674d1 block: Introduce ... |
1544 |
req = blk_mq_alloc_request(q, op, flags); |
d280bab30 block: Introduce ... |
1545 1546 1547 |
if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn) q->mq_ops->initialize_rq_fn(req); } else { |
6a15674d1 block: Introduce ... |
1548 |
req = blk_old_get_request(q, op, flags); |
d280bab30 block: Introduce ... |
1549 1550 1551 1552 1553 |
if (!IS_ERR(req) && q->initialize_rq_fn) q->initialize_rq_fn(req); } return req; |
320ae51fe blk-mq: new multi... |
1554 |
} |
1da177e4c Linux-2.6.12-rc2 |
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 |
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... |
1567 |
void blk_requeue_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1568 |
{ |
2fff8a924 block: Check lock... |
1569 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
1570 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
1571 |
|
242f9dcb8 block: unify requ... |
1572 1573 |
blk_delete_timer(rq); blk_clear_rq_complete(rq); |
5f3ea37c7 blktrace: port to... |
1574 |
trace_block_rq_requeue(q, rq); |
a79050434 blk-rq-qos: refac... |
1575 |
rq_qos_requeue(q, rq); |
2056a782f [PATCH] Block que... |
1576 |
|
e80640213 block: split out ... |
1577 |
if (rq->rq_flags & RQF_QUEUED) |
1da177e4c Linux-2.6.12-rc2 |
1578 |
blk_queue_end_tag(q, rq); |
ba396a6c1 block: fix oops w... |
1579 |
BUG_ON(blk_queued_rq(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1580 1581 |
elv_requeue_request(q, rq); } |
1da177e4c Linux-2.6.12-rc2 |
1582 |
EXPORT_SYMBOL(blk_requeue_request); |
73c101011 block: initial pa... |
1583 1584 1585 |
static void add_acct_request(struct request_queue *q, struct request *rq, int where) { |
320ae51fe blk-mq: new multi... |
1586 |
blk_account_io_start(rq, true); |
7eaceacca block: remove per... |
1587 |
__elv_add_request(q, rq, where); |
73c101011 block: initial pa... |
1588 |
} |
d62e26b3f block: pass in qu... |
1589 |
static void part_round_stats_single(struct request_queue *q, int cpu, |
b8d62b3a9 blk-mq: enable ch... |
1590 1591 |
struct hd_struct *part, unsigned long now, unsigned int inflight) |
074a7aca7 block: move stats... |
1592 |
{ |
b8d62b3a9 blk-mq: enable ch... |
1593 |
if (inflight) { |
074a7aca7 block: move stats... |
1594 |
__part_stat_add(cpu, part, time_in_queue, |
b8d62b3a9 blk-mq: enable ch... |
1595 |
inflight * (now - part->stamp)); |
074a7aca7 block: move stats... |
1596 1597 1598 1599 1600 1601 |
__part_stat_add(cpu, part, io_ticks, (now - part->stamp)); } part->stamp = now; } /** |
496aa8a98 block: fix curren... |
1602 |
* part_round_stats() - Round off the performance stats on a struct disk_stats. |
d62e26b3f block: pass in qu... |
1603 |
* @q: target block queue |
496aa8a98 block: fix curren... |
1604 1605 |
* @cpu: cpu number for stats access * @part: target partition |
1da177e4c Linux-2.6.12-rc2 |
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 |
* * 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... |
1618 |
void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part) |
6f2576af5 Enhanced partitio... |
1619 |
{ |
b8d62b3a9 blk-mq: enable ch... |
1620 |
struct hd_struct *part2 = NULL; |
6f2576af5 Enhanced partitio... |
1621 |
unsigned long now = jiffies; |
b8d62b3a9 blk-mq: enable ch... |
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 |
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... |
1638 |
|
b8d62b3a9 blk-mq: enable ch... |
1639 1640 1641 1642 |
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... |
1643 |
} |
074a7aca7 block: move stats... |
1644 |
EXPORT_SYMBOL_GPL(part_round_stats); |
6f2576af5 Enhanced partitio... |
1645 |
|
47fafbc70 block / PM: Repla... |
1646 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
1647 1648 |
static void blk_pm_put_request(struct request *rq) { |
e80640213 block: split out ... |
1649 |
if (rq->q->dev && !(rq->rq_flags & RQF_PM) && !--rq->q->nr_pending) |
c8158819d block: implement ... |
1650 1651 1652 1653 1654 |
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... |
1655 |
void __blk_put_request(struct request_queue *q, struct request *req) |
1da177e4c Linux-2.6.12-rc2 |
1656 |
{ |
e80640213 block: split out ... |
1657 |
req_flags_t rq_flags = req->rq_flags; |
1da177e4c Linux-2.6.12-rc2 |
1658 1659 |
if (unlikely(!q)) return; |
1da177e4c Linux-2.6.12-rc2 |
1660 |
|
6f5ba581c blk-mq: divert __... |
1661 1662 1663 1664 |
if (q->mq_ops) { blk_mq_free_request(req); return; } |
2fff8a924 block: Check lock... |
1665 |
lockdep_assert_held(q->queue_lock); |
6cc77e9cb block: introduce ... |
1666 |
blk_req_zone_write_unlock(req); |
c8158819d block: implement ... |
1667 |
blk_pm_put_request(req); |
8922e16cf [PATCH] 01/05 Imp... |
1668 |
elv_completed_request(q, req); |
1cd96c242 block: WARN in __... |
1669 1670 |
/* this is a bio leak */ WARN_ON(req->bio != NULL); |
a79050434 blk-rq-qos: refac... |
1671 |
rq_qos_done(q, req); |
87760e5ee block: hook up wr... |
1672 |
|
1da177e4c Linux-2.6.12-rc2 |
1673 1674 1675 1676 |
/* * 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 ... |
1677 |
if (rq_flags & RQF_ALLOCED) { |
a051661ca blkcg: implement ... |
1678 |
struct request_list *rl = blk_rq_rl(req); |
ef295ecf0 block: better op ... |
1679 |
bool sync = op_is_sync(req->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
1680 |
|
1da177e4c Linux-2.6.12-rc2 |
1681 |
BUG_ON(!list_empty(&req->queuelist)); |
360f92c24 block: fix regres... |
1682 |
BUG_ON(ELV_ON_HASH(req)); |
1da177e4c Linux-2.6.12-rc2 |
1683 |
|
a051661ca blkcg: implement ... |
1684 |
blk_free_request(rl, req); |
e80640213 block: split out ... |
1685 |
freed_request(rl, sync, rq_flags); |
a051661ca blkcg: implement ... |
1686 |
blk_put_rl(rl); |
055f6e18e block: Make q_usa... |
1687 |
blk_queue_exit(q); |
1da177e4c Linux-2.6.12-rc2 |
1688 1689 |
} } |
6e39b69e7 [SCSI] export blk... |
1690 |
EXPORT_SYMBOL_GPL(__blk_put_request); |
1da177e4c Linux-2.6.12-rc2 |
1691 1692 |
void blk_put_request(struct request *req) { |
165125e1e [BLOCK] Get rid o... |
1693 |
struct request_queue *q = req->q; |
8922e16cf [PATCH] 01/05 Imp... |
1694 |
|
320ae51fe blk-mq: new multi... |
1695 1696 1697 1698 1699 1700 1701 1702 1703 |
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 |
1704 |
} |
1da177e4c Linux-2.6.12-rc2 |
1705 |
EXPORT_SYMBOL(blk_put_request); |
320ae51fe blk-mq: new multi... |
1706 1707 |
bool bio_attempt_back_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1708 |
{ |
1eff9d322 block: rename bio... |
1709 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1710 |
|
73c101011 block: initial pa... |
1711 1712 |
if (!ll_back_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1713 |
trace_block_bio_backmerge(q, req, bio); |
73c101011 block: initial pa... |
1714 1715 1716 1717 1718 1719 |
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... |
1720 |
req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1721 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1722 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1723 1724 |
return true; } |
320ae51fe blk-mq: new multi... |
1725 1726 |
bool bio_attempt_front_merge(struct request_queue *q, struct request *req, struct bio *bio) |
73c101011 block: initial pa... |
1727 |
{ |
1eff9d322 block: rename bio... |
1728 |
const int ff = bio->bi_opf & REQ_FAILFAST_MASK; |
73c101011 block: initial pa... |
1729 |
|
73c101011 block: initial pa... |
1730 1731 |
if (!ll_front_merge_fn(q, req, bio)) return false; |
8c1cf6bb0 block: add @req t... |
1732 |
trace_block_bio_frontmerge(q, req, bio); |
73c101011 block: initial pa... |
1733 1734 1735 |
if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); |
73c101011 block: initial pa... |
1736 1737 |
bio->bi_next = req->bio; req->bio = bio; |
4f024f379 block: Abstract o... |
1738 1739 |
req->__sector = bio->bi_iter.bi_sector; req->__data_len += bio->bi_iter.bi_size; |
73c101011 block: initial pa... |
1740 |
req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); |
320ae51fe blk-mq: new multi... |
1741 |
blk_account_io_start(req, false); |
73c101011 block: initial pa... |
1742 1743 |
return true; } |
1e739730c block: optionally... |
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 |
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 ... |
1767 |
/** |
320ae51fe blk-mq: new multi... |
1768 |
* blk_attempt_plug_merge - try to merge with %current's plugged list |
bd87b5898 block: drop @tsk ... |
1769 1770 1771 |
* @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... |
1772 1773 1774 |
* @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 ... |
1775 1776 1777 1778 1779 |
* * 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... |
1780 1781 1782 1783 1784 1785 |
* 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... |
1786 1787 |
* * Caller must ensure !blk_queue_nomerges(q) beforehand. |
73c101011 block: initial pa... |
1788 |
*/ |
320ae51fe blk-mq: new multi... |
1789 |
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
5b3f341f0 blk-mq: make plug... |
1790 1791 |
unsigned int *request_count, struct request **same_queue_rq) |
73c101011 block: initial pa... |
1792 1793 1794 |
{ struct blk_plug *plug; struct request *rq; |
92f399c72 blk-mq: mq plug l... |
1795 |
struct list_head *plug_list; |
73c101011 block: initial pa... |
1796 |
|
bd87b5898 block: drop @tsk ... |
1797 |
plug = current->plug; |
73c101011 block: initial pa... |
1798 |
if (!plug) |
34fe7c054 block: enumify EL... |
1799 |
return false; |
56ebdaf2f block: simplify f... |
1800 |
*request_count = 0; |
73c101011 block: initial pa... |
1801 |
|
92f399c72 blk-mq: mq plug l... |
1802 1803 1804 1805 1806 1807 |
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... |
1808 |
bool merged = false; |
73c101011 block: initial pa... |
1809 |
|
5b3f341f0 blk-mq: make plug... |
1810 |
if (rq->q == q) { |
1b2e19f17 block: make auto ... |
1811 |
(*request_count)++; |
5b3f341f0 blk-mq: make plug... |
1812 1813 1814 1815 1816 1817 1818 1819 |
/* * 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... |
1820 |
|
07c2bd373 block: don't call... |
1821 |
if (rq->q != q || !blk_rq_merge_ok(rq, bio)) |
73c101011 block: initial pa... |
1822 |
continue; |
34fe7c054 block: enumify EL... |
1823 1824 1825 1826 1827 1828 1829 |
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... |
1830 1831 1832 |
case ELEVATOR_DISCARD_MERGE: merged = bio_attempt_discard_merge(q, rq, bio); break; |
34fe7c054 block: enumify EL... |
1833 1834 |
default: break; |
73c101011 block: initial pa... |
1835 |
} |
34fe7c054 block: enumify EL... |
1836 1837 1838 |
if (merged) return true; |
73c101011 block: initial pa... |
1839 |
} |
34fe7c054 block: enumify EL... |
1840 1841 |
return false; |
73c101011 block: initial pa... |
1842 |
} |
0809e3ac6 block: fix plug l... |
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 |
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... |
1866 |
void blk_init_request_from_bio(struct request *req, struct bio *bio) |
52d9e6753 [BLOCK] ll_rw_blk... |
1867 |
{ |
0be0dee64 block: Inline blk... |
1868 |
struct io_context *ioc = rq_ioc(bio); |
1eff9d322 block: rename bio... |
1869 |
if (bio->bi_opf & REQ_RAHEAD) |
a82afdfcb block: use the sa... |
1870 |
req->cmd_flags |= REQ_FAILFAST_MASK; |
b31dc66a5 [PATCH] Kill PF_S... |
1871 |
|
4f024f379 block: Abstract o... |
1872 |
req->__sector = bio->bi_iter.bi_sector; |
5dc8b362a block: Add iocont... |
1873 1874 |
if (ioprio_valid(bio_prio(bio))) req->ioprio = bio_prio(bio); |
0be0dee64 block: Inline blk... |
1875 1876 1877 1878 |
else if (ioc) req->ioprio = ioc->ioprio; else req->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); |
cb6934f8e block: add suppor... |
1879 |
req->write_hint = bio->bi_write_hint; |
bc1c56fde Share code betwee... |
1880 |
blk_rq_bio_prep(req->q, req, bio); |
52d9e6753 [BLOCK] ll_rw_blk... |
1881 |
} |
da8d7f079 block: Export blk... |
1882 |
EXPORT_SYMBOL_GPL(blk_init_request_from_bio); |
52d9e6753 [BLOCK] ll_rw_blk... |
1883 |
|
dece16353 block: change ->m... |
1884 |
static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1885 |
{ |
73c101011 block: initial pa... |
1886 |
struct blk_plug *plug; |
34fe7c054 block: enumify EL... |
1887 |
int where = ELEVATOR_INSERT_SORT; |
e4d750c97 block: free merge... |
1888 |
struct request *req, *free; |
56ebdaf2f block: simplify f... |
1889 |
unsigned int request_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
1890 |
|
1da177e4c Linux-2.6.12-rc2 |
1891 1892 1893 1894 1895 1896 |
/* * 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... |
1897 |
blk_queue_split(q, &bio); |
23688bf4f block: ensure to ... |
1898 |
|
e23947bd7 bio-integrity: fo... |
1899 |
if (!bio_integrity_prep(bio)) |
dece16353 block: change ->m... |
1900 |
return BLK_QC_T_NONE; |
ffecfd1a7 block: optionally... |
1901 |
|
f73f44eb0 block: add a op_i... |
1902 |
if (op_is_flush(bio->bi_opf)) { |
73c101011 block: initial pa... |
1903 |
spin_lock_irq(q->queue_lock); |
ae1b15396 block: reimplemen... |
1904 |
where = ELEVATOR_INSERT_FLUSH; |
28e7d1845 block: drop barri... |
1905 1906 |
goto get_rq; } |
73c101011 block: initial pa... |
1907 1908 1909 1910 |
/* * Check if we can merge with the plugged list before grabbing * any locks. */ |
0809e3ac6 block: fix plug l... |
1911 1912 |
if (!blk_queue_nomerges(q)) { if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) |
dece16353 block: change ->m... |
1913 |
return BLK_QC_T_NONE; |
0809e3ac6 block: fix plug l... |
1914 1915 |
} else request_count = blk_plug_queued_count(q); |
1da177e4c Linux-2.6.12-rc2 |
1916 |
|
73c101011 block: initial pa... |
1917 |
spin_lock_irq(q->queue_lock); |
2056a782f [PATCH] Block que... |
1918 |
|
34fe7c054 block: enumify EL... |
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 |
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 |
1942 |
} |
450991bc1 [PATCH] blk: __ma... |
1943 |
get_rq: |
c1c80384c block: remove ext... |
1944 |
rq_qos_throttle(q, bio, q->queue_lock); |
87760e5ee block: hook up wr... |
1945 |
|
1da177e4c Linux-2.6.12-rc2 |
1946 |
/* |
450991bc1 [PATCH] blk: __ma... |
1947 |
* Grab a free request. This is might sleep but can not fail. |
d6344532a [PATCH] blk: redu... |
1948 |
* Returns with the queue unlocked. |
450991bc1 [PATCH] blk: __ma... |
1949 |
*/ |
055f6e18e block: Make q_usa... |
1950 |
blk_queue_enter_live(q); |
c3036021c block: use GFP_NO... |
1951 |
req = get_request(q, bio->bi_opf, bio, 0, GFP_NOIO); |
a492f0754 block,scsi: fixup... |
1952 |
if (IS_ERR(req)) { |
055f6e18e block: Make q_usa... |
1953 |
blk_queue_exit(q); |
c1c80384c block: remove ext... |
1954 |
rq_qos_cleanup(q, bio); |
4e4cbee93 block: switch bio... |
1955 1956 1957 1958 |
if (PTR_ERR(req) == -ENOMEM) bio->bi_status = BLK_STS_RESOURCE; else bio->bi_status = BLK_STS_IOERR; |
4246a0b63 block: add a bi_e... |
1959 |
bio_endio(bio); |
da8303c63 block: make get_r... |
1960 1961 |
goto out_unlock; } |
d6344532a [PATCH] blk: redu... |
1962 |
|
c1c80384c block: remove ext... |
1963 |
rq_qos_track(q, req, bio); |
87760e5ee block: hook up wr... |
1964 |
|
450991bc1 [PATCH] blk: __ma... |
1965 1966 1967 1968 1969 |
/* * 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 |
1970 |
*/ |
da8d7f079 block: Export blk... |
1971 |
blk_init_request_from_bio(req, bio); |
1da177e4c Linux-2.6.12-rc2 |
1972 |
|
9562ad9ab block: Remove the... |
1973 |
if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) |
11ccf116d block: fix warnin... |
1974 |
req->cpu = raw_smp_processor_id(); |
73c101011 block: initial pa... |
1975 1976 |
plug = current->plug; |
721a9602e block: kill off R... |
1977 |
if (plug) { |
dc6d36c97 block: readd plug... |
1978 1979 |
/* * If this is the first request added after a plug, fire |
7aef2e780 block: trace all ... |
1980 |
* of a plug trace. |
0a6219a95 block: deal with ... |
1981 1982 1983 |
* * @request_count may become stale because of schedule * out, so check plug list again. |
dc6d36c97 block: readd plug... |
1984 |
*/ |
0a6219a95 block: deal with ... |
1985 |
if (!request_count || list_empty(&plug->list)) |
dc6d36c97 block: readd plug... |
1986 |
trace_block_plug(q); |
3540d5e89 block: avoid unne... |
1987 |
else { |
50d24c344 block: immediatel... |
1988 1989 1990 |
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... |
1991 |
blk_flush_plug_list(plug, false); |
019ceb7d5 block: add missed... |
1992 1993 |
trace_block_plug(q); } |
73c101011 block: initial pa... |
1994 |
} |
73c101011 block: initial pa... |
1995 |
list_add_tail(&req->queuelist, &plug->list); |
320ae51fe blk-mq: new multi... |
1996 |
blk_account_io_start(req, true); |
73c101011 block: initial pa... |
1997 1998 1999 |
} else { spin_lock_irq(q->queue_lock); add_acct_request(q, req, where); |
24ecfbe27 block: add blk_ru... |
2000 |
__blk_run_queue(q); |
73c101011 block: initial pa... |
2001 2002 2003 |
out_unlock: spin_unlock_irq(q->queue_lock); } |
dece16353 block: change ->m... |
2004 2005 |
return BLK_QC_T_NONE; |
1da177e4c Linux-2.6.12-rc2 |
2006 |
} |
52c5e62d4 block: bio_check_... |
2007 |
static void handle_bad_sector(struct bio *bio, sector_t maxsector) |
1da177e4c Linux-2.6.12-rc2 |
2008 2009 2010 2011 2012 |
{ char b[BDEVNAME_SIZE]; printk(KERN_INFO "attempt to access beyond end of device "); |
6296b9604 block, drivers, f... |
2013 2014 |
printk(KERN_INFO "%s: rw=%d, want=%Lu, limit=%Lu ", |
74d46992e block: replace bi... |
2015 |
bio_devname(bio, b), bio->bi_opf, |
f73a1c7d1 block: Add bio_en... |
2016 |
(unsigned long long)bio_end_sector(bio), |
52c5e62d4 block: bio_check_... |
2017 |
(long long)maxsector); |
1da177e4c Linux-2.6.12-rc2 |
2018 |
} |
c17bb4951 [PATCH] fault-inj... |
2019 2020 2021 2022 2023 2024 2025 2026 2027 |
#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... |
2028 |
static bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
2029 |
{ |
b2c9cd379 fail_make_request... |
2030 |
return part->make_it_fail && should_fail(&fail_make_request, bytes); |
c17bb4951 [PATCH] fault-inj... |
2031 2032 2033 2034 |
} static int __init fail_make_request_debugfs(void) { |
dd48c085c fault-injection: ... |
2035 2036 |
struct dentry *dir = fault_create_debugfs_attr("fail_make_request", NULL, &fail_make_request); |
21f9fcd81 block: replace IS... |
2037 |
return PTR_ERR_OR_ZERO(dir); |
c17bb4951 [PATCH] fault-inj... |
2038 2039 2040 2041 2042 |
} late_initcall(fail_make_request_debugfs); #else /* CONFIG_FAIL_MAKE_REQUEST */ |
b2c9cd379 fail_make_request... |
2043 2044 |
static inline bool should_fail_request(struct hd_struct *part, unsigned int bytes) |
c17bb4951 [PATCH] fault-inj... |
2045 |
{ |
b2c9cd379 fail_make_request... |
2046 |
return false; |
c17bb4951 [PATCH] fault-inj... |
2047 2048 2049 |
} #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
721c7fc70 block: fail op_is... |
2050 2051 |
static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) { |
b089cfd95 block: don't warn... |
2052 |
const int op = bio_op(bio); |
8b2ded1c9 block: don't warn... |
2053 |
if (part->policy && op_is_write(op)) { |
721c7fc70 block: fail op_is... |
2054 |
char b[BDEVNAME_SIZE]; |
8b2ded1c9 block: don't warn... |
2055 2056 |
if (op_is_flush(bio->bi_opf) && !bio_sectors(bio)) return false; |
a32e236eb Partially revert ... |
2057 |
WARN_ONCE(1, |
721c7fc70 block: fail op_is... |
2058 2059 2060 2061 |
"generic_make_request: Trying to write " "to read-only block-device %s (partno %d) ", bio_devname(bio, b), part->partno); |
a32e236eb Partially revert ... |
2062 2063 |
/* Older lvm-tools actually trigger this */ return false; |
721c7fc70 block: fail op_is... |
2064 2065 2066 2067 |
} return false; } |
30abb3a67 block: Add should... |
2068 2069 2070 2071 2072 2073 2074 |
static noinline int should_fail_bio(struct bio *bio) { if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) return -EIO; return 0; } ALLOW_ERROR_INJECTION(should_fail_bio, ERRNO); |
c07e2b412 block: factor our... |
2075 |
/* |
52c5e62d4 block: bio_check_... |
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 |
* 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... |
2094 2095 2096 2097 2098 |
* 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; |
52c5e62d4 block: bio_check_... |
2099 |
int ret = -EIO; |
74d46992e block: replace bi... |
2100 |
|
721c7fc70 block: fail op_is... |
2101 2102 |
rcu_read_lock(); p = __disk_get_part(bio->bi_disk, bio->bi_partno); |
52c5e62d4 block: bio_check_... |
2103 2104 2105 2106 2107 |
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))) |
721c7fc70 block: fail op_is... |
2108 |
goto out; |
721c7fc70 block: fail op_is... |
2109 |
|
74d46992e block: replace bi... |
2110 2111 2112 2113 |
/* * 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. */ |
52c5e62d4 block: bio_check_... |
2114 2115 2116 2117 |
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; |
52c5e62d4 block: bio_check_... |
2118 2119 2120 |
trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p), bio->bi_iter.bi_sector - p->start_sect); } |
c04fa44b7 block: always set... |
2121 |
bio->bi_partno = 0; |
52c5e62d4 block: bio_check_... |
2122 |
ret = 0; |
721c7fc70 block: fail op_is... |
2123 2124 |
out: rcu_read_unlock(); |
74d46992e block: replace bi... |
2125 2126 |
return ret; } |
27a84d54c block: refactor g... |
2127 2128 |
static noinline_for_stack bool generic_make_request_checks(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2129 |
{ |
165125e1e [BLOCK] Get rid o... |
2130 |
struct request_queue *q; |
5a7bbad27 block: remove sup... |
2131 |
int nr_sectors = bio_sectors(bio); |
4e4cbee93 block: switch bio... |
2132 |
blk_status_t status = BLK_STS_IOERR; |
5a7bbad27 block: remove sup... |
2133 |
char b[BDEVNAME_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
2134 2135 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
2136 |
|
74d46992e block: replace bi... |
2137 |
q = bio->bi_disk->queue; |
5a7bbad27 block: remove sup... |
2138 2139 2140 2141 2142 |
if (unlikely(!q)) { printk(KERN_ERR "generic_make_request: Trying to access " "nonexistent block-device %s (%Lu) ", |
74d46992e block: replace bi... |
2143 |
bio_devname(bio, b), (long long)bio->bi_iter.bi_sector); |
5a7bbad27 block: remove sup... |
2144 2145 |
goto end_io; } |
c17bb4951 [PATCH] fault-inj... |
2146 |
|
03a07c92a block: return on ... |
2147 2148 2149 2150 |
/* * For a REQ_NOWAIT based request, return -EOPNOTSUPP * if queue is not a request based queue. */ |
03a07c92a block: return on ... |
2151 2152 |
if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_rq_based(q)) goto not_supported; |
30abb3a67 block: Add should... |
2153 |
if (should_fail_bio(bio)) |
5a7bbad27 block: remove sup... |
2154 |
goto end_io; |
2056a782f [PATCH] Block que... |
2155 |
|
52c5e62d4 block: bio_check_... |
2156 2157 |
if (bio->bi_partno) { if (unlikely(blk_partition_remap(bio))) |
721c7fc70 block: fail op_is... |
2158 2159 |
goto end_io; } else { |
52c5e62d4 block: bio_check_... |
2160 2161 2162 |
if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0))) goto end_io; if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk)))) |
721c7fc70 block: fail op_is... |
2163 2164 |
goto end_io; } |
2056a782f [PATCH] Block que... |
2165 |
|
5a7bbad27 block: remove sup... |
2166 2167 2168 2169 2170 |
/* * 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... |
2171 |
if (op_is_flush(bio->bi_opf) && |
c888a8f95 block: kill off q... |
2172 |
!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) { |
1eff9d322 block: rename bio... |
2173 |
bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA); |
5a7bbad27 block: remove sup... |
2174 |
if (!nr_sectors) { |
4e4cbee93 block: switch bio... |
2175 |
status = BLK_STS_OK; |
51fd77bd9 [BLOCK] Don't all... |
2176 2177 |
goto end_io; } |
5a7bbad27 block: remove sup... |
2178 |
} |
5ddfe9691 [PATCH] md: check... |
2179 |
|
288dab8a3 block: add a sepa... |
2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 |
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... |
2190 |
if (!q->limits.max_write_same_sectors) |
288dab8a3 block: add a sepa... |
2191 |
goto not_supported; |
58886785d block: fix uninte... |
2192 |
break; |
2d253440b block: Define zon... |
2193 2194 |
case REQ_OP_ZONE_REPORT: case REQ_OP_ZONE_RESET: |
74d46992e block: replace bi... |
2195 |
if (!blk_queue_is_zoned(q)) |
2d253440b block: Define zon... |
2196 |
goto not_supported; |
288dab8a3 block: add a sepa... |
2197 |
break; |
a6f0788ec block: add suppor... |
2198 |
case REQ_OP_WRITE_ZEROES: |
74d46992e block: replace bi... |
2199 |
if (!q->limits.max_write_zeroes_sectors) |
a6f0788ec block: add suppor... |
2200 2201 |
goto not_supported; break; |
288dab8a3 block: add a sepa... |
2202 2203 |
default: break; |
5a7bbad27 block: remove sup... |
2204 |
} |
01edede41 block: trace bio ... |
2205 |
|
7f4b35d15 block: allocate i... |
2206 2207 2208 2209 2210 2211 2212 |
/* * 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... |
2213 2214 |
if (!blkcg_bio_issue_check(q, bio)) return false; |
27a84d54c block: refactor g... |
2215 |
|
fbbaf700e block: trace comp... |
2216 2217 2218 2219 2220 2221 2222 |
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... |
2223 |
return true; |
a7384677b block: remove dup... |
2224 |
|
288dab8a3 block: add a sepa... |
2225 |
not_supported: |
4e4cbee93 block: switch bio... |
2226 |
status = BLK_STS_NOTSUPP; |
a7384677b block: remove dup... |
2227 |
end_io: |
4e4cbee93 block: switch bio... |
2228 |
bio->bi_status = status; |
4246a0b63 block: add a bi_e... |
2229 |
bio_endio(bio); |
27a84d54c block: refactor g... |
2230 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
2231 |
} |
27a84d54c block: refactor g... |
2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 |
/** * 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... |
2255 |
*/ |
dece16353 block: change ->m... |
2256 |
blk_qc_t generic_make_request(struct bio *bio) |
d89d87965 When stacked bloc... |
2257 |
{ |
f5fe1b519 blk: Ensure users... |
2258 2259 2260 2261 2262 2263 2264 2265 |
/* * 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]; |
37f9579f4 blk-mq: Avoid tha... |
2266 2267 |
blk_mq_req_flags_t flags = 0; struct request_queue *q = bio->bi_disk->queue; |
dece16353 block: change ->m... |
2268 |
blk_qc_t ret = BLK_QC_T_NONE; |
bddd87c7e blk-core: use BIO... |
2269 |
|
37f9579f4 blk-mq: Avoid tha... |
2270 2271 |
if (bio->bi_opf & REQ_NOWAIT) flags = BLK_MQ_REQ_NOWAIT; |
cd4a4ae46 block: don't use ... |
2272 2273 2274 |
if (bio_flagged(bio, BIO_QUEUE_ENTERED)) blk_queue_enter_live(q); else if (blk_queue_enter(q, flags) < 0) { |
37f9579f4 blk-mq: Avoid tha... |
2275 2276 2277 2278 2279 2280 |
if (!blk_queue_dying(q) && (bio->bi_opf & REQ_NOWAIT)) bio_wouldblock_error(bio); else bio_io_error(bio); return ret; } |
27a84d54c block: refactor g... |
2281 |
if (!generic_make_request_checks(bio)) |
dece16353 block: change ->m... |
2282 |
goto out; |
27a84d54c block: refactor g... |
2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 |
/* * 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... |
2294 |
if (current->bio_list) { |
f5fe1b519 blk: Ensure users... |
2295 |
bio_list_add(¤t->bio_list[0], bio); |
dece16353 block: change ->m... |
2296 |
goto out; |
d89d87965 When stacked bloc... |
2297 |
} |
27a84d54c block: refactor g... |
2298 |
|
d89d87965 When stacked bloc... |
2299 2300 2301 2302 2303 |
/* 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... |
2304 2305 |
* 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... |
2306 |
* added. ->make_request() may indeed add some more bios |
d89d87965 When stacked bloc... |
2307 2308 2309 |
* 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... |
2310 |
* of the top of the list (no pretending) and so remove it from |
27a84d54c block: refactor g... |
2311 |
* bio_list, and call into ->make_request() again. |
d89d87965 When stacked bloc... |
2312 2313 |
*/ BUG_ON(bio->bi_next); |
f5fe1b519 blk: Ensure users... |
2314 2315 |
bio_list_init(&bio_list_on_stack[0]); current->bio_list = bio_list_on_stack; |
d89d87965 When stacked bloc... |
2316 |
do { |
37f9579f4 blk-mq: Avoid tha... |
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 |
bool enter_succeeded = true; if (unlikely(q != bio->bi_disk->queue)) { if (q) blk_queue_exit(q); q = bio->bi_disk->queue; flags = 0; if (bio->bi_opf & REQ_NOWAIT) flags = BLK_MQ_REQ_NOWAIT; if (blk_queue_enter(q, flags) < 0) { enter_succeeded = false; q = NULL; } } |
27a84d54c block: refactor g... |
2331 |
|
37f9579f4 blk-mq: Avoid tha... |
2332 |
if (enter_succeeded) { |
79bd99596 blk: improve orde... |
2333 2334 2335 |
struct bio_list lower, same; /* Create a fresh bio_list for all subordinate requests */ |
f5fe1b519 blk: Ensure users... |
2336 2337 |
bio_list_on_stack[1] = bio_list_on_stack[0]; bio_list_init(&bio_list_on_stack[0]); |
dece16353 block: change ->m... |
2338 |
ret = q->make_request_fn(q, bio); |
3ef28e83a block: generic re... |
2339 |
|
79bd99596 blk: improve orde... |
2340 2341 2342 2343 2344 |
/* 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... |
2345 |
while ((bio = bio_list_pop(&bio_list_on_stack[0])) != NULL) |
74d46992e block: replace bi... |
2346 |
if (q == bio->bi_disk->queue) |
79bd99596 blk: improve orde... |
2347 2348 2349 2350 |
bio_list_add(&same, bio); else bio_list_add(&lower, bio); /* now assemble so we handle the lowest level first */ |
f5fe1b519 blk: Ensure users... |
2351 2352 2353 |
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... |
2354 |
} else { |
03a07c92a block: return on ... |
2355 2356 2357 2358 2359 |
if (unlikely(!blk_queue_dying(q) && (bio->bi_opf & REQ_NOWAIT))) bio_wouldblock_error(bio); else bio_io_error(bio); |
3ef28e83a block: generic re... |
2360 |
} |
f5fe1b519 blk: Ensure users... |
2361 |
bio = bio_list_pop(&bio_list_on_stack[0]); |
d89d87965 When stacked bloc... |
2362 |
} while (bio); |
bddd87c7e blk-core: use BIO... |
2363 |
current->bio_list = NULL; /* deactivate */ |
dece16353 block: change ->m... |
2364 2365 |
out: |
37f9579f4 blk-mq: Avoid tha... |
2366 2367 |
if (q) blk_queue_exit(q); |
dece16353 block: change ->m... |
2368 |
return ret; |
d89d87965 When stacked bloc... |
2369 |
} |
1da177e4c Linux-2.6.12-rc2 |
2370 2371 2372 |
EXPORT_SYMBOL(generic_make_request); /** |
f421e1d9a block: provide a ... |
2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 |
* 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; |
3a0a52997 block, scsi: Make... |
2390 |
if (unlikely(blk_queue_enter(q, nowait ? BLK_MQ_REQ_NOWAIT : 0))) { |
f421e1d9a block: provide a ... |
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 |
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... |
2406 |
* submit_bio - submit a bio to the block device layer for I/O |
1da177e4c Linux-2.6.12-rc2 |
2407 2408 2409 2410 |
* @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... |
2411 |
* interfaces; @bio must be presetup and ready for I/O. |
1da177e4c Linux-2.6.12-rc2 |
2412 2413 |
* */ |
4e49ea4a3 block/fs/drivers:... |
2414 |
blk_qc_t submit_bio(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2415 |
{ |
bf2de6f5a block: Initial su... |
2416 2417 2418 2419 |
/* * 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... |
2420 |
if (bio_has_data(bio)) { |
4363ac7c1 block: Implement ... |
2421 |
unsigned int count; |
95fe6c1a2 block, fs, mm, dr... |
2422 |
if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) |
7c5a0dcf5 block: fix the co... |
2423 |
count = queue_logical_block_size(bio->bi_disk->queue) >> 9; |
4363ac7c1 block: Implement ... |
2424 2425 |
else count = bio_sectors(bio); |
a8ebb056a block, drivers, c... |
2426 |
if (op_is_write(bio_op(bio))) { |
bf2de6f5a block: Initial su... |
2427 2428 |
count_vm_events(PGPGOUT, count); } else { |
4f024f379 block: Abstract o... |
2429 |
task_io_account_read(bio->bi_iter.bi_size); |
bf2de6f5a block: Initial su... |
2430 2431 2432 2433 2434 |
count_vm_events(PGPGIN, count); } if (unlikely(block_dump)) { char b[BDEVNAME_SIZE]; |
8dcbdc742 block: block_dump... |
2435 2436 |
printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors) ", |
ba25f9dcc Use helpers to ob... |
2437 |
current->comm, task_pid_nr(current), |
a8ebb056a block, drivers, c... |
2438 |
op_is_write(bio_op(bio)) ? "WRITE" : "READ", |
4f024f379 block: Abstract o... |
2439 |
(unsigned long long)bio->bi_iter.bi_sector, |
74d46992e block: replace bi... |
2440 |
bio_devname(bio, b), count); |
bf2de6f5a block: Initial su... |
2441 |
} |
1da177e4c Linux-2.6.12-rc2 |
2442 |
} |
dece16353 block: change ->m... |
2443 |
return generic_make_request(bio); |
1da177e4c Linux-2.6.12-rc2 |
2444 |
} |
1da177e4c Linux-2.6.12-rc2 |
2445 |
EXPORT_SYMBOL(submit_bio); |
ea435e1b9 block: add a poll... |
2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 |
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: ... |
2456 |
/** |
bf4e6b4e7 block: Always che... |
2457 2458 |
* blk_cloned_rq_check_limits - Helper function to check a cloned request * for new the queue limits |
82124d603 block: add reques... |
2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 |
* @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... |
2469 |
* Request stacking drivers like request-based dm may change the queue |
bf4e6b4e7 block: Always che... |
2470 2471 |
* 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... |
2472 |
*/ |
bf4e6b4e7 block: Always che... |
2473 2474 |
static int blk_cloned_rq_check_limits(struct request_queue *q, struct request *rq) |
82124d603 block: add reques... |
2475 |
{ |
8fe0d473f block: convert me... |
2476 |
if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, req_op(rq))) { |
82124d603 block: add reques... |
2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 |
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... |
2489 |
if (rq->nr_phys_segments > queue_max_segments(q)) { |
82124d603 block: add reques... |
2490 2491 2492 2493 2494 2495 2496 |
printk(KERN_ERR "%s: over max segments limit. ", __func__); return -EIO; } return 0; } |
82124d603 block: add reques... |
2497 2498 2499 2500 2501 2502 |
/** * 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 ... |
2503 |
blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *rq) |
82124d603 block: add reques... |
2504 2505 |
{ unsigned long flags; |
4853abaae block: fix flush ... |
2506 |
int where = ELEVATOR_INSERT_BACK; |
82124d603 block: add reques... |
2507 |
|
bf4e6b4e7 block: Always che... |
2508 |
if (blk_cloned_rq_check_limits(q, rq)) |
2a842acab block: introduce ... |
2509 |
return BLK_STS_IOERR; |
82124d603 block: add reques... |
2510 |
|
b2c9cd379 fail_make_request... |
2511 2512 |
if (rq->rq_disk && should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) |
2a842acab block: introduce ... |
2513 |
return BLK_STS_IOERR; |
82124d603 block: add reques... |
2514 |
|
7fb4898e0 block: add blk-mq... |
2515 2516 2517 |
if (q->mq_ops) { if (blk_queue_io_stat(q)) blk_account_io_start(rq, true); |
157f377be block: directly i... |
2518 2519 2520 2521 2522 |
/* * Since we have a scheduler attached on the top device, * bypass a potential scheduler on the bottom device for * insert. */ |
c77ff7fd0 blk-mq: Rename bl... |
2523 |
return blk_mq_request_issue_directly(rq); |
7fb4898e0 block: add blk-mq... |
2524 |
} |
82124d603 block: add reques... |
2525 |
spin_lock_irqsave(q->queue_lock, flags); |
3f3299d5c block: Rename que... |
2526 |
if (unlikely(blk_queue_dying(q))) { |
8ba61435d block: add missin... |
2527 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2a842acab block: introduce ... |
2528 |
return BLK_STS_IOERR; |
8ba61435d block: add missin... |
2529 |
} |
82124d603 block: add reques... |
2530 2531 2532 2533 2534 2535 |
/* * 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... |
2536 |
if (op_is_flush(rq->cmd_flags)) |
4853abaae block: fix flush ... |
2537 2538 2539 |
where = ELEVATOR_INSERT_FLUSH; add_acct_request(q, rq, where); |
e67b77c79 blk-flush: move t... |
2540 2541 |
if (where == ELEVATOR_INSERT_FLUSH) __blk_run_queue(q); |
82124d603 block: add reques... |
2542 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2a842acab block: introduce ... |
2543 |
return BLK_STS_OK; |
82124d603 block: add reques... |
2544 2545 |
} EXPORT_SYMBOL_GPL(blk_insert_cloned_request); |
80a761fd3 block: implement ... |
2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 |
/** * 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 ... |
2558 2559 2560 2561 2562 2563 |
*/ 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 ... |
2564 |
if (!(rq->rq_flags & RQF_MIXED_MERGE)) |
80a761fd3 block: implement ... |
2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 |
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... |
2575 |
if ((bio->bi_opf & ff) != ff) |
80a761fd3 block: implement ... |
2576 |
break; |
4f024f379 block: Abstract o... |
2577 |
bytes += bio->bi_iter.bi_size; |
80a761fd3 block: implement ... |
2578 2579 2580 2581 2582 2583 2584 |
} /* 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... |
2585 |
void blk_account_io_completion(struct request *req, unsigned int bytes) |
bc58ba946 block: add sysfs ... |
2586 |
{ |
c2553b584 block: make blk_d... |
2587 |
if (blk_do_io_stat(req)) { |
ddcf35d39 block: Add and us... |
2588 |
const int sgrp = op_stat_group(req_op(req)); |
bc58ba946 block: add sysfs ... |
2589 2590 2591 2592 |
struct hd_struct *part; int cpu; cpu = part_stat_lock(); |
09e099d4b block: fix accoun... |
2593 |
part = req->part; |
ddcf35d39 block: Add and us... |
2594 |
part_stat_add(cpu, part, sectors[sgrp], bytes >> 9); |
bc58ba946 block: add sysfs ... |
2595 2596 2597 |
part_stat_unlock(); } } |
522a77756 block: consolidat... |
2598 |
void blk_account_io_done(struct request *req, u64 now) |
bc58ba946 block: add sysfs ... |
2599 |
{ |
bc58ba946 block: add sysfs ... |
2600 |
/* |
dd4c133f3 block: rename bar... |
2601 2602 2603 |
* 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 ... |
2604 |
*/ |
e80640213 block: split out ... |
2605 |
if (blk_do_io_stat(req) && !(req->rq_flags & RQF_FLUSH_SEQ)) { |
ddcf35d39 block: Add and us... |
2606 |
const int sgrp = op_stat_group(req_op(req)); |
bc58ba946 block: add sysfs ... |
2607 2608 2609 2610 |
struct hd_struct *part; int cpu; cpu = part_stat_lock(); |
09e099d4b block: fix accoun... |
2611 |
part = req->part; |
bc58ba946 block: add sysfs ... |
2612 |
|
ddcf35d39 block: Add and us... |
2613 |
part_stat_inc(cpu, part, ios[sgrp]); |
b57e99b4b block: use nanose... |
2614 |
part_stat_add(cpu, part, nsecs[sgrp], now - req->start_time_ns); |
d62e26b3f block: pass in qu... |
2615 |
part_round_stats(req->q, cpu, part); |
ddcf35d39 block: Add and us... |
2616 |
part_dec_in_flight(req->q, part, rq_data_dir(req)); |
bc58ba946 block: add sysfs ... |
2617 |
|
6c23a9681 block: add intern... |
2618 |
hd_struct_put(part); |
bc58ba946 block: add sysfs ... |
2619 2620 2621 |
part_stat_unlock(); } } |
47fafbc70 block / PM: Repla... |
2622 |
#ifdef CONFIG_PM |
c8158819d block: implement ... |
2623 2624 2625 2626 |
/* * Don't process normal requests when queue is suspended * or in the process of suspending/resuming */ |
e4f36b249 block: fix peekin... |
2627 |
static bool blk_pm_allow_request(struct request *rq) |
c8158819d block: implement ... |
2628 |
{ |
e4f36b249 block: fix peekin... |
2629 2630 2631 2632 2633 2634 |
switch (rq->q->rpm_status) { case RPM_RESUMING: case RPM_SUSPENDING: return rq->rq_flags & RQF_PM; case RPM_SUSPENDED: return false; |
e9a838533 block: Add defaul... |
2635 2636 |
default: return true; |
e4f36b249 block: fix peekin... |
2637 |
} |
c8158819d block: implement ... |
2638 2639 |
} #else |
e4f36b249 block: fix peekin... |
2640 |
static bool blk_pm_allow_request(struct request *rq) |
c8158819d block: implement ... |
2641 |
{ |
e4f36b249 block: fix peekin... |
2642 |
return true; |
c8158819d block: implement ... |
2643 2644 |
} #endif |
320ae51fe blk-mq: new multi... |
2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 |
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... |
2673 2674 |
part_round_stats(rq->q, cpu, part); part_inc_in_flight(rq->q, part, rw); |
320ae51fe blk-mq: new multi... |
2675 2676 2677 2678 2679 |
rq->part = part; } part_stat_unlock(); } |
9c9883744 block: move __elv... |
2680 2681 2682 2683 2684 2685 2686 2687 |
static struct request *elv_next_request(struct request_queue *q) { struct request *rq; struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); WARN_ON_ONCE(q->mq_ops); while (1) { |
e4f36b249 block: fix peekin... |
2688 2689 2690 2691 2692 2693 |
list_for_each_entry(rq, &q->queue_head, queuelist) { if (blk_pm_allow_request(rq)) return rq; if (rq->rq_flags & RQF_SOFTBARRIER) break; |
9c9883744 block: move __elv... |
2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 |
} /* * Flush request is running and flush request isn't queueable * in the drive, we can hold the queue till flush request is * finished. Even we don't do this, driver can't dispatch next * requests and will requeue them. And this can improve * throughput too. For example, we have request flush1, write1, * flush 2. flush1 is dispatched, then queue is hold, write1 * isn't inserted to queue. After flush1 is finished, flush2 * will be dispatched. Since disk cache is already clean, * flush2 will be finished very soon, so looks like flush2 is * folded to flush1. * Since the queue is hold, a flag is set to indicate the queue * should be restarted later. Please see flush_end_io() for * details. */ if (fq->flush_pending_idx != fq->flush_running_idx && !queue_flush_queueable(q)) { fq->flush_queue_delayed = 1; return NULL; } if (unlikely(blk_queue_bypass(q)) || !q->elevator->type->ops.sq.elevator_dispatch_fn(q, 0)) return NULL; } } |
53a08807c block: internal d... |
2721 |
/** |
9934c8c04 block: implement ... |
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 |
* 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 ... |
2733 2734 |
*/ struct request *blk_peek_request(struct request_queue *q) |
158dbda00 block: reorganize... |
2735 2736 2737 |
{ struct request *rq; int ret; |
2fff8a924 block: Check lock... |
2738 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
2739 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
2740 |
|
9c9883744 block: move __elv... |
2741 |
while ((rq = elv_next_request(q)) != NULL) { |
e80640213 block: split out ... |
2742 |
if (!(rq->rq_flags & RQF_STARTED)) { |
158dbda00 block: reorganize... |
2743 2744 2745 2746 2747 |
/* * This is the first time the device driver * sees this request (possibly after * requeueing). Notify IO scheduler. */ |
e80640213 block: split out ... |
2748 |
if (rq->rq_flags & RQF_SORTED) |
158dbda00 block: reorganize... |
2749 2750 2751 2752 2753 2754 2755 |
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 ... |
2756 |
rq->rq_flags |= RQF_STARTED; |
158dbda00 block: reorganize... |
2757 2758 2759 2760 2761 2762 2763 |
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 ... |
2764 |
if (rq->rq_flags & RQF_DONTPREP) |
158dbda00 block: reorganize... |
2765 |
break; |
2e46e8b27 block: drop reque... |
2766 |
if (q->dma_drain_size && blk_rq_bytes(rq)) { |
158dbda00 block: reorganize... |
2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 |
/* * 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 ... |
2786 |
* avoid resource deadlock. RQF_STARTED will |
158dbda00 block: reorganize... |
2787 2788 |
* prevent other fs requests from passing this one. */ |
2e46e8b27 block: drop reque... |
2789 |
if (q->dma_drain_size && blk_rq_bytes(rq) && |
e80640213 block: split out ... |
2790 |
!(rq->rq_flags & RQF_DONTPREP)) { |
158dbda00 block: reorganize... |
2791 2792 2793 2794 2795 2796 2797 2798 2799 |
/* * 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 ... |
2800 |
} else if (ret == BLKPREP_KILL || ret == BLKPREP_INVALID) { |
e80640213 block: split out ... |
2801 |
rq->rq_flags |= RQF_QUIET; |
c143dc903 block: fix an oop... |
2802 2803 2804 2805 2806 |
/* * 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 ... |
2807 2808 |
__blk_end_request_all(rq, ret == BLKPREP_INVALID ? BLK_STS_TARGET : BLK_STS_IOERR); |
158dbda00 block: reorganize... |
2809 2810 2811 2812 2813 2814 2815 2816 2817 |
} else { printk(KERN_ERR "%s: bad return=%d ", __func__, ret); break; } } return rq; } |
9934c8c04 block: implement ... |
2818 |
EXPORT_SYMBOL(blk_peek_request); |
158dbda00 block: reorganize... |
2819 |
|
5034435c8 block: Make blk_d... |
2820 |
static void blk_dequeue_request(struct request *rq) |
158dbda00 block: reorganize... |
2821 |
{ |
9934c8c04 block: implement ... |
2822 |
struct request_queue *q = rq->q; |
158dbda00 block: reorganize... |
2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 |
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. */ |
522a77756 block: consolidat... |
2833 |
if (blk_account_rq(rq)) |
0a7ae2ff0 block: change the... |
2834 |
q->in_flight[rq_is_sync(rq)]++; |
158dbda00 block: reorganize... |
2835 |
} |
5efccd17c block: reorder re... |
2836 |
/** |
9934c8c04 block: implement ... |
2837 2838 2839 2840 2841 2842 |
* 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 ... |
2843 2844 2845 |
*/ void blk_start_request(struct request *req) { |
2fff8a924 block: Check lock... |
2846 |
lockdep_assert_held(req->q->queue_lock); |
332ebbf7f block: Document w... |
2847 |
WARN_ON_ONCE(req->q->mq_ops); |
2fff8a924 block: Check lock... |
2848 |
|
9934c8c04 block: implement ... |
2849 |
blk_dequeue_request(req); |
cf43e6be8 block: add scalab... |
2850 |
if (test_bit(QUEUE_FLAG_STATS, &req->q->queue_flags)) { |
544ccc8dc block: get rid of... |
2851 2852 2853 2854 |
req->io_start_time_ns = ktime_get_ns(); #ifdef CONFIG_BLK_DEV_THROTTLING_LOW req->throtl_size = blk_rq_sectors(req); #endif |
cf43e6be8 block: add scalab... |
2855 |
req->rq_flags |= RQF_STATS; |
a79050434 blk-rq-qos: refac... |
2856 |
rq_qos_issue(req->q, req); |
cf43e6be8 block: add scalab... |
2857 |
} |
e14575b3d block: convert RE... |
2858 |
BUG_ON(blk_rq_is_complete(req)); |
9934c8c04 block: implement ... |
2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 |
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 ... |
2874 2875 2876 2877 |
*/ struct request *blk_fetch_request(struct request_queue *q) { struct request *rq; |
2fff8a924 block: Check lock... |
2878 |
lockdep_assert_held(q->queue_lock); |
332ebbf7f block: Document w... |
2879 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
2880 |
|
9934c8c04 block: implement ... |
2881 2882 2883 2884 2885 2886 |
rq = blk_peek_request(q); if (rq) blk_start_request(rq); return rq; } EXPORT_SYMBOL(blk_fetch_request); |
ef71de8b1 block: add a blk_... |
2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 |
/* * 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 ... |
2907 |
/** |
2e60e0229 block: clean up r... |
2908 |
* blk_update_request - Special helper function for request stacking drivers |
8ebf97560 block: fix kernel... |
2909 |
* @req: the request being processed |
2a842acab block: introduce ... |
2910 |
* @error: block status code |
8ebf97560 block: fix kernel... |
2911 |
* @nr_bytes: number of bytes to complete @req |
3bcddeac1 blk_end_request: ... |
2912 2913 |
* * Description: |
8ebf97560 block: fix kernel... |
2914 2915 2916 |
* 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... |
2917 2918 2919 2920 2921 2922 2923 |
* * 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: ... |
2924 |
* |
1954e9a99 block: Document h... |
2925 2926 2927 2928 |
* Note: * The RQF_SPECIAL_PAYLOAD flag is ignored on purpose in both * blk_rq_bytes() and in blk_update_request(). * |
3bcddeac1 blk_end_request: ... |
2929 |
* Return: |
2e60e0229 block: clean up r... |
2930 2931 |
* %false - this request doesn't have any more data * %true - this request has more data |
3bcddeac1 blk_end_request: ... |
2932 |
**/ |
2a842acab block: introduce ... |
2933 2934 |
bool blk_update_request(struct request *req, blk_status_t error, unsigned int nr_bytes) |
1da177e4c Linux-2.6.12-rc2 |
2935 |
{ |
f79ea4161 block: Refactor b... |
2936 |
int total_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2937 |
|
2a842acab block: introduce ... |
2938 |
trace_block_rq_complete(req, blk_status_to_errno(error), nr_bytes); |
4a0efdc93 block: misplaced ... |
2939 |
|
2e60e0229 block: clean up r... |
2940 2941 |
if (!req->bio) return false; |
2a842acab block: introduce ... |
2942 2943 2944 |
if (unlikely(error && !blk_rq_is_passthrough(req) && !(req->rq_flags & RQF_QUIET))) print_req_error(req, error); |
1da177e4c Linux-2.6.12-rc2 |
2945 |
|
bc58ba946 block: add sysfs ... |
2946 |
blk_account_io_completion(req, nr_bytes); |
d72d904a5 [BLOCK] Update re... |
2947 |
|
f79ea4161 block: Refactor b... |
2948 2949 2950 |
total_bytes = 0; while (req->bio) { struct bio *bio = req->bio; |
4f024f379 block: Abstract o... |
2951 |
unsigned bio_bytes = min(bio->bi_iter.bi_size, nr_bytes); |
1da177e4c Linux-2.6.12-rc2 |
2952 |
|
9c24c10a2 Revert "block: Ad... |
2953 |
if (bio_bytes == bio->bi_iter.bi_size) |
1da177e4c Linux-2.6.12-rc2 |
2954 |
req->bio = bio->bi_next; |
1da177e4c Linux-2.6.12-rc2 |
2955 |
|
fbbaf700e block: trace comp... |
2956 2957 |
/* Completion has already been traced */ bio_clear_flag(bio, BIO_TRACE_COMPLETION); |
f79ea4161 block: Refactor b... |
2958 |
req_bio_endio(req, bio, bio_bytes, error); |
1da177e4c Linux-2.6.12-rc2 |
2959 |
|
f79ea4161 block: Refactor b... |
2960 2961 |
total_bytes += bio_bytes; nr_bytes -= bio_bytes; |
1da177e4c Linux-2.6.12-rc2 |
2962 |
|
f79ea4161 block: Refactor b... |
2963 2964 |
if (!nr_bytes) break; |
1da177e4c Linux-2.6.12-rc2 |
2965 2966 2967 2968 2969 |
} /* * completely done */ |
2e60e0229 block: clean up r... |
2970 2971 2972 2973 2974 2975 |
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... |
2976 |
req->__data_len = 0; |
2e60e0229 block: clean up r... |
2977 2978 |
return false; } |
1da177e4c Linux-2.6.12-rc2 |
2979 |
|
a2dec7b36 block: hide reque... |
2980 |
req->__data_len -= total_bytes; |
2e46e8b27 block: drop reque... |
2981 2982 |
/* update sector only for requests with clear definition of sector */ |
57292b58d block: introduce ... |
2983 |
if (!blk_rq_is_passthrough(req)) |
a2dec7b36 block: hide reque... |
2984 |
req->__sector += total_bytes >> 9; |
2e46e8b27 block: drop reque... |
2985 |
|
80a761fd3 block: implement ... |
2986 |
/* mixed attributes always follow the first bio */ |
e80640213 block: split out ... |
2987 |
if (req->rq_flags & RQF_MIXED_MERGE) { |
80a761fd3 block: implement ... |
2988 |
req->cmd_flags &= ~REQ_FAILFAST_MASK; |
1eff9d322 block: rename bio... |
2989 |
req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK; |
80a761fd3 block: implement ... |
2990 |
} |
ed6565e73 block: handle par... |
2991 2992 2993 2994 2995 2996 2997 2998 2999 |
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... |
3000 |
|
ed6565e73 block: handle par... |
3001 3002 3003 |
/* recalculate the number of segments */ blk_recalc_rq_segments(req); } |
2e46e8b27 block: drop reque... |
3004 |
|
2e60e0229 block: clean up r... |
3005 |
return true; |
1da177e4c Linux-2.6.12-rc2 |
3006 |
} |
2e60e0229 block: clean up r... |
3007 |
EXPORT_SYMBOL_GPL(blk_update_request); |
1da177e4c Linux-2.6.12-rc2 |
3008 |
|
2a842acab block: introduce ... |
3009 |
static bool blk_update_bidi_request(struct request *rq, blk_status_t error, |
2e60e0229 block: clean up r... |
3010 3011 |
unsigned int nr_bytes, unsigned int bidi_bytes) |
5efccd17c block: reorder re... |
3012 |
{ |
2e60e0229 block: clean up r... |
3013 3014 |
if (blk_update_request(rq, error, nr_bytes)) return true; |
5efccd17c block: reorder re... |
3015 |
|
2e60e0229 block: clean up r... |
3016 3017 3018 3019 |
/* 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... |
3020 |
|
e2e1a148b block: add sysfs ... |
3021 3022 |
if (blk_queue_add_random(rq->q)) add_disk_randomness(rq->rq_disk); |
2e60e0229 block: clean up r... |
3023 3024 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
3025 |
} |
28018c242 block: implement ... |
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 |
/** * 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 ... |
3039 |
req->rq_flags &= ~RQF_DONTPREP; |
28018c242 block: implement ... |
3040 3041 3042 3043 |
if (q->unprep_rq_fn) q->unprep_rq_fn(q, req); } EXPORT_SYMBOL_GPL(blk_unprep_request); |
2a842acab block: introduce ... |
3044 |
void blk_finish_request(struct request *req, blk_status_t error) |
1da177e4c Linux-2.6.12-rc2 |
3045 |
{ |
cf43e6be8 block: add scalab... |
3046 |
struct request_queue *q = req->q; |
522a77756 block: consolidat... |
3047 |
u64 now = ktime_get_ns(); |
cf43e6be8 block: add scalab... |
3048 |
|
2fff8a924 block: Check lock... |
3049 |
lockdep_assert_held(req->q->queue_lock); |
332ebbf7f block: Document w... |
3050 |
WARN_ON_ONCE(q->mq_ops); |
2fff8a924 block: Check lock... |
3051 |
|
cf43e6be8 block: add scalab... |
3052 |
if (req->rq_flags & RQF_STATS) |
522a77756 block: consolidat... |
3053 |
blk_stat_add(req, now); |
cf43e6be8 block: add scalab... |
3054 |
|
e80640213 block: split out ... |
3055 |
if (req->rq_flags & RQF_QUEUED) |
cf43e6be8 block: add scalab... |
3056 |
blk_queue_end_tag(q, req); |
b8286239d blk_end_request: ... |
3057 |
|
ba396a6c1 block: fix oops w... |
3058 |
BUG_ON(blk_queued_rq(req)); |
1da177e4c Linux-2.6.12-rc2 |
3059 |
|
57292b58d block: introduce ... |
3060 |
if (unlikely(laptop_mode) && !blk_rq_is_passthrough(req)) |
dc3b17cc8 block: Use pointe... |
3061 |
laptop_io_completion(req->q->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
3062 |
|
e78042e5b blk: move blk_del... |
3063 |
blk_delete_timer(req); |
e80640213 block: split out ... |
3064 |
if (req->rq_flags & RQF_DONTPREP) |
28018c242 block: implement ... |
3065 |
blk_unprep_request(req); |
522a77756 block: consolidat... |
3066 |
blk_account_io_done(req, now); |
b8286239d blk_end_request: ... |
3067 |
|
87760e5ee block: hook up wr... |
3068 |
if (req->end_io) { |
a79050434 blk-rq-qos: refac... |
3069 |
rq_qos_done(q, req); |
8ffdc6550 [BLOCK] add @upto... |
3070 |
req->end_io(req, error); |
87760e5ee block: hook up wr... |
3071 |
} else { |
b8286239d blk_end_request: ... |
3072 3073 |
if (blk_bidi_rq(req)) __blk_put_request(req->next_rq->q, req->next_rq); |
cf43e6be8 block: add scalab... |
3074 |
__blk_put_request(q, req); |
b8286239d blk_end_request: ... |
3075 |
} |
1da177e4c Linux-2.6.12-rc2 |
3076 |
} |
12120077b block: export blk... |
3077 |
EXPORT_SYMBOL(blk_finish_request); |
1da177e4c Linux-2.6.12-rc2 |
3078 |
|
3b11313a6 blk_end_request: ... |
3079 |
/** |
2e60e0229 block: clean up r... |
3080 3081 |
* blk_end_bidi_request - Complete a bidi request * @rq: the request to complete |
2a842acab block: introduce ... |
3082 |
* @error: block status code |
2e60e0229 block: clean up r... |
3083 3084 |
* @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
a0cd12854 block: add end_qu... |
3085 3086 |
* * Description: |
e3a04fe34 blk_end_request: ... |
3087 |
* Ends I/O on a number of bytes attached to @rq and @rq->next_rq. |
2e60e0229 block: clean up r... |
3088 3089 3090 |
* 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: ... |
3091 3092 |
* * Return: |
2e60e0229 block: clean up r... |
3093 3094 |
* %false - we are done with this request * %true - still buffers pending for this request |
a0cd12854 block: add end_qu... |
3095 |
**/ |
2a842acab block: introduce ... |
3096 |
static bool blk_end_bidi_request(struct request *rq, blk_status_t error, |
32fab448e block: add reques... |
3097 3098 |
unsigned int nr_bytes, unsigned int bidi_bytes) { |
336cdb400 blk_end_request: ... |
3099 |
struct request_queue *q = rq->q; |
2e60e0229 block: clean up r... |
3100 |
unsigned long flags; |
32fab448e block: add reques... |
3101 |
|
332ebbf7f block: Document w... |
3102 |
WARN_ON_ONCE(q->mq_ops); |
2e60e0229 block: clean up r... |
3103 3104 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
32fab448e block: add reques... |
3105 |
|
336cdb400 blk_end_request: ... |
3106 |
spin_lock_irqsave(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
3107 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
3108 |
spin_unlock_irqrestore(q->queue_lock, flags); |
2e60e0229 block: clean up r... |
3109 |
return false; |
32fab448e block: add reques... |
3110 |
} |
336cdb400 blk_end_request: ... |
3111 |
/** |
2e60e0229 block: clean up r... |
3112 3113 |
* __blk_end_bidi_request - Complete a bidi request with queue lock held * @rq: the request to complete |
2a842acab block: introduce ... |
3114 |
* @error: block status code |
e3a04fe34 blk_end_request: ... |
3115 3116 |
* @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq |
336cdb400 blk_end_request: ... |
3117 3118 |
* * Description: |
2e60e0229 block: clean up r... |
3119 3120 |
* 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: ... |
3121 3122 |
* * Return: |
2e60e0229 block: clean up r... |
3123 3124 |
* %false - we are done with this request * %true - still buffers pending for this request |
336cdb400 blk_end_request: ... |
3125 |
**/ |
2a842acab block: introduce ... |
3126 |
static bool __blk_end_bidi_request(struct request *rq, blk_status_t error, |
b1f744937 block: move compl... |
3127 |
unsigned int nr_bytes, unsigned int bidi_bytes) |
336cdb400 blk_end_request: ... |
3128 |
{ |
2fff8a924 block: Check lock... |
3129 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
3130 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
3131 |
|
2e60e0229 block: clean up r... |
3132 3133 |
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; |
336cdb400 blk_end_request: ... |
3134 |
|
2e60e0229 block: clean up r... |
3135 |
blk_finish_request(rq, error); |
336cdb400 blk_end_request: ... |
3136 |
|
2e60e0229 block: clean up r... |
3137 |
return false; |
336cdb400 blk_end_request: ... |
3138 |
} |
e19a3ab05 blk_end_request: ... |
3139 3140 3141 3142 |
/** * blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed |
2a842acab block: introduce ... |
3143 |
* @error: block status code |
e19a3ab05 blk_end_request: ... |
3144 3145 3146 3147 3148 3149 3150 |
* @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... |
3151 3152 |
* %false - we are done with this request * %true - still buffers pending for this request |
e19a3ab05 blk_end_request: ... |
3153 |
**/ |
2a842acab block: introduce ... |
3154 3155 |
bool blk_end_request(struct request *rq, blk_status_t error, unsigned int nr_bytes) |
e19a3ab05 blk_end_request: ... |
3156 |
{ |
332ebbf7f block: Document w... |
3157 |
WARN_ON_ONCE(rq->q->mq_ops); |
b1f744937 block: move compl... |
3158 |
return blk_end_bidi_request(rq, error, nr_bytes, 0); |
e19a3ab05 blk_end_request: ... |
3159 |
} |
56ad1740d block: make the e... |
3160 |
EXPORT_SYMBOL(blk_end_request); |
336cdb400 blk_end_request: ... |
3161 3162 |
/** |
b1f744937 block: move compl... |
3163 3164 |
* blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
2a842acab block: introduce ... |
3165 |
* @error: block status code |
336cdb400 blk_end_request: ... |
3166 3167 |
* * Description: |
b1f744937 block: move compl... |
3168 3169 |
* Completely finish @rq. */ |
2a842acab block: introduce ... |
3170 |
void blk_end_request_all(struct request *rq, blk_status_t error) |
336cdb400 blk_end_request: ... |
3171 |
{ |
b1f744937 block: move compl... |
3172 3173 |
bool pending; unsigned int bidi_bytes = 0; |
336cdb400 blk_end_request: ... |
3174 |
|
b1f744937 block: move compl... |
3175 3176 |
if (unlikely(blk_bidi_rq(rq))) bidi_bytes = blk_rq_bytes(rq->next_rq); |
336cdb400 blk_end_request: ... |
3177 |
|
b1f744937 block: move compl... |
3178 3179 3180 |
pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); BUG_ON(pending); } |
56ad1740d block: make the e... |
3181 |
EXPORT_SYMBOL(blk_end_request_all); |
336cdb400 blk_end_request: ... |
3182 |
|
b1f744937 block: move compl... |
3183 |
/** |
b1f744937 block: move compl... |
3184 3185 |
* __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed |
2a842acab block: introduce ... |
3186 |
* @error: block status code |
b1f744937 block: move compl... |
3187 |
* @nr_bytes: number of bytes to complete |
e3a04fe34 blk_end_request: ... |
3188 3189 |
* * Description: |
b1f744937 block: move compl... |
3190 |
* Must be called with queue lock held unlike blk_end_request(). |
e3a04fe34 blk_end_request: ... |
3191 3192 |
* * Return: |
b1f744937 block: move compl... |
3193 3194 |
* %false - we are done with this request * %true - still buffers pending for this request |
e3a04fe34 blk_end_request: ... |
3195 |
**/ |
2a842acab block: introduce ... |
3196 3197 |
bool __blk_end_request(struct request *rq, blk_status_t error, unsigned int nr_bytes) |
e3a04fe34 blk_end_request: ... |
3198 |
{ |
2fff8a924 block: Check lock... |
3199 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
3200 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
3201 |
|
b1f744937 block: move compl... |
3202 |
return __blk_end_bidi_request(rq, error, nr_bytes, 0); |
e3a04fe34 blk_end_request: ... |
3203 |
} |
56ad1740d block: make the e... |
3204 |
EXPORT_SYMBOL(__blk_end_request); |
e3a04fe34 blk_end_request: ... |
3205 3206 |
/** |
b1f744937 block: move compl... |
3207 3208 |
* __blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish |
2a842acab block: introduce ... |
3209 |
* @error: block status code |
32fab448e block: add reques... |
3210 3211 |
* * Description: |
b1f744937 block: move compl... |
3212 |
* Completely finish @rq. Must be called with queue lock held. |
32fab448e block: add reques... |
3213 |
*/ |
2a842acab block: introduce ... |
3214 |
void __blk_end_request_all(struct request *rq, blk_status_t error) |
32fab448e block: add reques... |
3215 |
{ |
b1f744937 block: move compl... |
3216 3217 |
bool pending; unsigned int bidi_bytes = 0; |
2fff8a924 block: Check lock... |
3218 |
lockdep_assert_held(rq->q->queue_lock); |
332ebbf7f block: Document w... |
3219 |
WARN_ON_ONCE(rq->q->mq_ops); |
2fff8a924 block: Check lock... |
3220 |
|
b1f744937 block: move compl... |
3221 3222 3223 3224 3225 |
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... |
3226 |
} |
56ad1740d block: make the e... |
3227 |
EXPORT_SYMBOL(__blk_end_request_all); |
32fab448e block: add reques... |
3228 3229 |
/** |
b1f744937 block: move compl... |
3230 3231 |
* __blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for |
2a842acab block: introduce ... |
3232 |
* @error: block status code |
e19a3ab05 blk_end_request: ... |
3233 3234 |
* * Description: |
b1f744937 block: move compl... |
3235 3236 |
* Complete the current consecutively mapped chunk from @rq. Must * be called with queue lock held. |
e19a3ab05 blk_end_request: ... |
3237 3238 |
* * Return: |
b1f744937 block: move compl... |
3239 3240 3241 |
* %false - we are done with this request * %true - still buffers pending for this request */ |
2a842acab block: introduce ... |
3242 |
bool __blk_end_request_cur(struct request *rq, blk_status_t error) |
e19a3ab05 blk_end_request: ... |
3243 |
{ |
b1f744937 block: move compl... |
3244 |
return __blk_end_request(rq, error, blk_rq_cur_bytes(rq)); |
e19a3ab05 blk_end_request: ... |
3245 |
} |
56ad1740d block: make the e... |
3246 |
EXPORT_SYMBOL(__blk_end_request_cur); |
e19a3ab05 blk_end_request: ... |
3247 |
|
86db1e297 block: continue l... |
3248 3249 |
void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
3250 |
{ |
b4f42e283 block: remove str... |
3251 |
if (bio_has_data(bio)) |
fb2dce862 Add 'discard' req... |
3252 |
rq->nr_phys_segments = bio_phys_segments(q, bio); |
445251d0f blk-mq: fix disca... |
3253 3254 |
else if (bio_op(bio) == REQ_OP_DISCARD) rq->nr_phys_segments = 1; |
b4f42e283 block: remove str... |
3255 |
|
4f024f379 block: Abstract o... |
3256 |
rq->__data_len = bio->bi_iter.bi_size; |
1da177e4c Linux-2.6.12-rc2 |
3257 |
rq->bio = rq->biotail = bio; |
1da177e4c Linux-2.6.12-rc2 |
3258 |
|
74d46992e block: replace bi... |
3259 3260 |
if (bio->bi_disk) rq->rq_disk = bio->bi_disk; |
66846572b Stop exporting bl... |
3261 |
} |
1da177e4c Linux-2.6.12-rc2 |
3262 |
|
2d4dc890b block: add helper... |
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 |
#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... |
3274 |
struct bio_vec bvec; |
2d4dc890b block: add helper... |
3275 3276 |
rq_for_each_segment(bvec, rq, iter) |
7988613b0 block: Convert bi... |
3277 |
flush_dcache_page(bvec.bv_page); |
2d4dc890b block: add helper... |
3278 3279 3280 |
} EXPORT_SYMBOL_GPL(rq_flush_dcache_pages); #endif |
ef9e3facd block: add lld bu... |
3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 |
/** * 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... |
3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 |
/** * 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... |
3332 3333 |
{ dst->cpu = src->cpu; |
b0fd271d5 block: add reques... |
3334 3335 |
dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); |
297ba57dc block: Fix clonin... |
3336 3337 3338 3339 |
if (src->rq_flags & RQF_SPECIAL_PAYLOAD) { dst->rq_flags |= RQF_SPECIAL_PAYLOAD; dst->special_vec = src->special_vec; } |
b0fd271d5 block: add reques... |
3340 3341 3342 |
dst->nr_phys_segments = src->nr_phys_segments; dst->ioprio = src->ioprio; dst->extra_len = src->extra_len; |
78d8e58a0 Revert "block, dm... |
3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 |
} /** * 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) |
f4f8154a0 block: Use bioset... |
3372 |
bs = &fs_bio_set; |
78d8e58a0 Revert "block, dm... |
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 |
__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... |
3399 3400 |
} EXPORT_SYMBOL_GPL(blk_rq_prep_clone); |
59c3d45e4 block: remove 'q'... |
3401 |
int kblockd_schedule_work(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
3402 3403 3404 |
{ return queue_work(kblockd_workqueue, work); } |
1da177e4c Linux-2.6.12-rc2 |
3405 |
EXPORT_SYMBOL(kblockd_schedule_work); |
ee63cfa7f block: add kblock... |
3406 3407 3408 3409 3410 |
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... |
3411 3412 3413 3414 3415 3416 |
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); |
75df71362 block: document b... |
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 |
/** * 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... |
3431 3432 3433 |
void blk_start_plug(struct blk_plug *plug) { struct task_struct *tsk = current; |
dd6cf3e18 blk: clean up plug |
3434 3435 3436 3437 3438 |
/* * If this is a nested plug, don't actually assign it. */ if (tsk->plug) return; |
73c101011 block: initial pa... |
3439 |
INIT_LIST_HEAD(&plug->list); |
320ae51fe blk-mq: new multi... |
3440 |
INIT_LIST_HEAD(&plug->mq_list); |
048c9374a block: Enhance ne... |
3441 |
INIT_LIST_HEAD(&plug->cb_list); |
73c101011 block: initial pa... |
3442 |
/* |
dd6cf3e18 blk: clean up plug |
3443 3444 |
* Store ordering should not be needed here, since a potential * preempt will imply a full memory barrier |
73c101011 block: initial pa... |
3445 |
*/ |
dd6cf3e18 blk: clean up plug |
3446 |
tsk->plug = plug; |
73c101011 block: initial pa... |
3447 3448 3449 3450 3451 3452 3453 |
} 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... |
3454 3455 |
return !(rqa->q < rqb->q || (rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb))); |
73c101011 block: initial pa... |
3456 |
} |
49cac01e1 block: make unplu... |
3457 3458 3459 3460 3461 3462 |
/* * 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... |
3463 |
static void queue_unplugged(struct request_queue *q, unsigned int depth, |
49cac01e1 block: make unplu... |
3464 |
bool from_schedule) |
99e22598e block: drop queue... |
3465 |
__releases(q->queue_lock) |
94b5eb28b block: fixup bloc... |
3466 |
{ |
2fff8a924 block: Check lock... |
3467 |
lockdep_assert_held(q->queue_lock); |
49cac01e1 block: make unplu... |
3468 |
trace_block_unplug(q, depth, !from_schedule); |
99e22598e block: drop queue... |
3469 |
|
704605711 block: Avoid sche... |
3470 |
if (from_schedule) |
24ecfbe27 block: add blk_ru... |
3471 |
blk_run_queue_async(q); |
704605711 block: Avoid sche... |
3472 |
else |
24ecfbe27 block: add blk_ru... |
3473 |
__blk_run_queue(q); |
50864670b block: Shorten in... |
3474 |
spin_unlock_irq(q->queue_lock); |
94b5eb28b block: fixup bloc... |
3475 |
} |
74018dc30 blk: pass from_sc... |
3476 |
static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) |
048c9374a block: Enhance ne... |
3477 3478 |
{ LIST_HEAD(callbacks); |
2a7d5559b block: stack unplug |
3479 3480 |
while (!list_empty(&plug->cb_list)) { list_splice_init(&plug->cb_list, &callbacks); |
048c9374a block: Enhance ne... |
3481 |
|
2a7d5559b block: stack unplug |
3482 3483 |
while (!list_empty(&callbacks)) { struct blk_plug_cb *cb = list_first_entry(&callbacks, |
048c9374a block: Enhance ne... |
3484 3485 |
struct blk_plug_cb, list); |
2a7d5559b block: stack unplug |
3486 |
list_del(&cb->list); |
74018dc30 blk: pass from_sc... |
3487 |
cb->callback(cb, from_schedule); |
2a7d5559b block: stack unplug |
3488 |
} |
048c9374a block: Enhance ne... |
3489 3490 |
} } |
9cbb17508 blk: centralize n... |
3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 |
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... |
3515 |
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) |
73c101011 block: initial pa... |
3516 3517 |
{ struct request_queue *q; |
73c101011 block: initial pa... |
3518 |
struct request *rq; |
109b81296 block: splice plu... |
3519 |
LIST_HEAD(list); |
94b5eb28b block: fixup bloc... |
3520 |
unsigned int depth; |
73c101011 block: initial pa... |
3521 |
|
74018dc30 blk: pass from_sc... |
3522 |
flush_plug_callbacks(plug, from_schedule); |
320ae51fe blk-mq: new multi... |
3523 3524 3525 |
if (!list_empty(&plug->mq_list)) blk_mq_flush_plug_list(plug, from_schedule); |
73c101011 block: initial pa... |
3526 3527 |
if (list_empty(&plug->list)) return; |
109b81296 block: splice plu... |
3528 |
list_splice_init(&plug->list, &list); |
422765c26 block: Remove sho... |
3529 |
list_sort(NULL, &list, plug_rq_cmp); |
73c101011 block: initial pa... |
3530 3531 |
q = NULL; |
94b5eb28b block: fixup bloc... |
3532 |
depth = 0; |
188112722 block: add commen... |
3533 |
|
109b81296 block: splice plu... |
3534 3535 |
while (!list_empty(&list)) { rq = list_entry_rq(list.next); |
73c101011 block: initial pa... |
3536 |
list_del_init(&rq->queuelist); |
73c101011 block: initial pa... |
3537 3538 |
BUG_ON(!rq->q); if (rq->q != q) { |
99e22598e block: drop queue... |
3539 3540 3541 3542 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3543 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3544 |
q = rq->q; |
94b5eb28b block: fixup bloc... |
3545 |
depth = 0; |
50864670b block: Shorten in... |
3546 |
spin_lock_irq(q->queue_lock); |
73c101011 block: initial pa... |
3547 |
} |
8ba61435d block: add missin... |
3548 3549 3550 3551 |
/* * Short-circuit if @q is dead */ |
3f3299d5c block: Rename que... |
3552 |
if (unlikely(blk_queue_dying(q))) { |
2a842acab block: introduce ... |
3553 |
__blk_end_request_all(rq, BLK_STS_IOERR); |
8ba61435d block: add missin... |
3554 3555 |
continue; } |
73c101011 block: initial pa... |
3556 3557 3558 |
/* * rq is already accounted, so use raw insert */ |
f73f44eb0 block: add a op_i... |
3559 |
if (op_is_flush(rq->cmd_flags)) |
401a18e92 block: fix bug wi... |
3560 3561 3562 |
__elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH); else __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE); |
94b5eb28b block: fixup bloc... |
3563 3564 |
depth++; |
73c101011 block: initial pa... |
3565 |
} |
99e22598e block: drop queue... |
3566 3567 3568 3569 |
/* * This drops the queue lock */ if (q) |
49cac01e1 block: make unplu... |
3570 |
queue_unplugged(q, depth, from_schedule); |
73c101011 block: initial pa... |
3571 |
} |
73c101011 block: initial pa... |
3572 3573 3574 |
void blk_finish_plug(struct blk_plug *plug) { |
dd6cf3e18 blk: clean up plug |
3575 3576 |
if (plug != current->plug) return; |
f6603783f block: only force... |
3577 |
blk_flush_plug_list(plug, false); |
73c101011 block: initial pa... |
3578 |
|
dd6cf3e18 blk: clean up plug |
3579 |
current->plug = NULL; |
73c101011 block: initial pa... |
3580 |
} |
88b996cd0 block: cleanup th... |
3581 |
EXPORT_SYMBOL(blk_finish_plug); |
73c101011 block: initial pa... |
3582 |
|
47fafbc70 block / PM: Repla... |
3583 |
#ifdef CONFIG_PM |
6c9546675 block: add runtim... |
3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 |
/** * 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) { |
b233f1270 block: really dis... |
3607 3608 3609 |
/* Don't enable runtime PM for blk-mq until it is ready */ if (q->mq_ops) { pm_runtime_disable(dev); |
765e40b67 block: disable ru... |
3610 |
return; |
b233f1270 block: really dis... |
3611 |
} |
765e40b67 block: disable ru... |
3612 |
|
6c9546675 block: add runtim... |
3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 |
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; |
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if (!q->dev) return ret; |
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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) { |
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if (!q->dev) return; |
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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) { |
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if (!q->dev) return; |
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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) { |
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if (!q->dev) return; |
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spin_lock_irq(q->queue_lock); if (!err) { q->rpm_status = RPM_ACTIVE; __blk_run_queue(q); pm_runtime_mark_last_busy(q->dev); |
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pm_request_autosuspend(q->dev); |
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} else { q->rpm_status = RPM_SUSPENDED; } spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL(blk_post_runtime_resume); |
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/** * 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); |
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#endif |
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int __init blk_dev_init(void) { |
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BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS)); BUILD_BUG_ON(REQ_OP_BITS + REQ_FLAG_BITS > 8 * |
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FIELD_SIZEOF(struct request, cmd_flags)); |
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BUILD_BUG_ON(REQ_OP_BITS + REQ_FLAG_BITS > 8 * FIELD_SIZEOF(struct bio, bi_opf)); |
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|
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/* used for unplugging and affects IO latency/throughput - HIGHPRI */ kblockd_workqueue = alloc_workqueue("kblockd", |
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WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); |
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if (!kblockd_workqueue) panic("Failed to create kblockd "); request_cachep = kmem_cache_create("blkdev_requests", |
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sizeof(struct request), 0, SLAB_PANIC, NULL); |
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|
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blk_requestq_cachep = kmem_cache_create("request_queue", |
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sizeof(struct request_queue), 0, SLAB_PANIC, NULL); |
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|
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#ifdef CONFIG_DEBUG_FS blk_debugfs_root = debugfs_create_dir("block", NULL); #endif |
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return 0; |
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} |