cregit-Linux how code gets into the kernel

Release 4.8 block/blk-core.c

Directory: block
/*
 * 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>
 * kernel-doc documentation started by NeilBrown <neilb@cse.unsw.edu.au>
 *      -  July2000
 * bio rewrite, highmem i/o, etc, Jens Axboe <axboe@suse.de> - may 2001
 */

/*
 * This handles all read/write requests to block devices
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/kernel_stat.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/fault-inject.h>
#include <linux/list_sort.h>
#include <linux/delay.h>
#include <linux/ratelimit.h>
#include <linux/pm_runtime.h>
#include <linux/blk-cgroup.h>


#define CREATE_TRACE_POINTS
#include <trace/events/block.h>

#include "blk.h"
#include "blk-mq.h"


EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);

EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);

EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);

EXPORT_TRACEPOINT_SYMBOL_GPL(block_split);

EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug);


DEFINE_IDA(blk_queue_ida);

/*
 * For the allocated request tables
 */

struct kmem_cache *request_cachep;

/*
 * For queue allocation
 */

struct kmem_cache *blk_requestq_cachep;

/*
 * Controlling structure to kblockd
 */

static struct workqueue_struct *kblockd_workqueue;


static void blk_clear_congested(struct request_list *rl, int sync) { #ifdef CONFIG_CGROUP_WRITEBACK clear_wb_congested(rl->blkg->wb_congested, sync); #else /* * If !CGROUP_WRITEBACK, all blkg's map to bdi->wb and we shouldn't * flip its congestion state for events on other blkcgs. */ if (rl == &rl->q->root_rl) clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync); #endif }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo59100.00%2100.00%
Total59100.00%2100.00%


static void blk_set_congested(struct request_list *rl, int sync) { #ifdef CONFIG_CGROUP_WRITEBACK set_wb_congested(rl->blkg->wb_congested, sync); #else /* see blk_clear_congested() */ if (rl == &rl->q->root_rl) set_wb_congested(rl->q->backing_dev_info.wb.congested, sync); #endif }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo59100.00%2100.00%
Total59100.00%2100.00%


void blk_queue_congestion_threshold(struct request_queue *q) { int nr; nr = q->nr_requests - (q->nr_requests / 8) + 1; if (nr > q->nr_requests) nr = q->nr_requests; q->nr_congestion_on = nr; nr = q->nr_requests - (q->nr_requests / 8) - (q->nr_requests / 16) - 1; if (nr < 1) nr = 1; q->nr_congestion_off = nr; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton7988.76%466.67%
jens axboejens axboe1011.24%233.33%
Total89100.00%6100.00%

/** * blk_get_backing_dev_info - get the address of a queue's backing_dev_info * @bdev: device * * Locates the passed device's request queue and returns the address of its * backing_dev_info. This function can only be called if @bdev is opened * and the return value is never NULL. */
struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev) { struct request_queue *q = bdev_get_queue(bdev); return &q->backing_dev_info; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton1967.86%342.86%
al viroal viro725.00%228.57%
tejun heotejun heo13.57%114.29%
jens axboejens axboe13.57%114.29%
Total28100.00%7100.00%

EXPORT_SYMBOL(blk_get_backing_dev_info);
void blk_rq_init(struct request_queue *q, struct request *rq) { memset(rq, 0, sizeof(*rq)); INIT_LIST_HEAD(&rq->queuelist); INIT_LIST_HEAD(&rq->timeout_list); rq->cpu = -1; rq->q = q; rq->__sector = (sector_t) -1; INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); rq->cmd = rq->__cmd; rq->cmd_len = BLK_MAX_CDB; rq->tag = -1; rq->start_time = jiffies; set_start_time_ns(rq); rq->part = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5948.76%735.00%
fujita tomonorifujita tomonori2218.18%315.00%
linus torvaldslinus torvalds119.09%210.00%
li zefanli zefan64.96%15.00%
jerome marchandjerome marchand64.96%15.00%
tejun heotejun heo54.13%210.00%
divyesh shahdivyesh shah54.13%15.00%
stuart mclarenstuart mclaren43.31%15.00%
pre-gitpre-git21.65%15.00%
arnaldo carvalho de meloarnaldo carvalho de melo10.83%15.00%
Total121100.00%20100.00%

EXPORT_SYMBOL(blk_rq_init);
static void req_bio_endio(struct request *rq, struct bio *bio, unsigned int nbytes, int error) { if (error) bio->bi_error = error; if (unlikely(rq->cmd_flags & REQ_QUIET)) bio_set_flag(bio, BIO_QUIET); bio_advance(bio, nbytes); /* don't actually finish bio if it's part of flush sequence */ if (bio->bi_iter.bi_size == 0 && !(rq->cmd_flags & REQ_FLUSH_SEQ)) bio_endio(bio); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe4655.42%436.36%
tejun heotejun heo1315.66%218.18%
keith manntheykeith mannthey1113.25%19.09%
martin k. petersenmartin k. petersen89.64%19.09%
kent overstreetkent overstreet33.61%218.18%
christoph hellwigchristoph hellwig22.41%19.09%
Total83100.00%11100.00%


void blk_dump_rq_flags(struct request *rq, char *msg) { int bit; printk(KERN_INFO "%s: dev %s: type=%x, flags=%llx\n", msg, rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type, (unsigned long long) rq->cmd_flags); printk(KERN_INFO " sector %llu, nr/cnr %u/%u\n", (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq), blk_rq_cur_sectors(rq)); printk(KERN_INFO " bio %p, biotail %p, len %u\n", rq->bio, rq->biotail, blk_rq_bytes(rq)); if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { printk(KERN_INFO " cdb: "); for (bit = 0; bit < BLK_MAX_CDB; bit++) printk("%02x ", rq->cmd[bit]); printk("\n"); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe11279.43%646.15%
tejun heotejun heo2417.02%538.46%
christoph hellwigchristoph hellwig42.84%17.69%
fujita tomonorifujita tomonori10.71%17.69%
Total141100.00%13100.00%

EXPORT_SYMBOL(blk_dump_rq_flags);
static void blk_delay_work(struct work_struct *work) { struct request_queue *q; q = container_of(work, struct request_queue, delay_work.work); spin_lock_irq(q->queue_lock); __blk_run_queue(q); spin_unlock_irq(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe49100.00%5100.00%
Total49100.00%5100.00%

/** * blk_delay_queue - restart queueing after defined interval * @q: The &struct request_queue in question * @msecs: Delay in msecs * * Description: * Sometimes queueing needs to be postponed for a little while, to allow * resources to come back. This function will make sure that queueing is * restarted around the specified time. Queue lock must be held. */
void blk_delay_queue(struct request_queue *q, unsigned long msecs) { if (likely(!blk_queue_dead(q))) queue_delayed_work(kblockd_workqueue, &q->delay_work, msecs_to_jiffies(msecs)); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2972.50%375.00%
bart van asschebart van assche1127.50%125.00%
Total40100.00%4100.00%

EXPORT_SYMBOL(blk_delay_queue); /** * blk_start_queue_async - asynchronously restart a previously stopped queue * @q: The &struct request_queue in question * * Description: * blk_start_queue_async() will clear the stop flag on the queue, and * ensure that the request_fn for the queue is run from an async * context. **/
void blk_start_queue_async(struct request_queue *q) { queue_flag_clear(QUEUE_FLAG_STOPPED, q); blk_run_queue_async(q); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe22100.00%1100.00%
Total22100.00%1100.00%

EXPORT_SYMBOL(blk_start_queue_async); /** * blk_start_queue - restart a previously stopped queue * @q: The &struct request_queue in question * * Description: * blk_start_queue() will clear the stop flag on the queue, and call * the request_fn for the queue if it was in a stopped state when * entered. Also see blk_stop_queue(). Queue lock must be held. **/
void blk_start_queue(struct request_queue *q) { WARN_ON(!irqs_disabled()); queue_flag_clear(QUEUE_FLAG_STOPPED, q); __blk_run_queue(q); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2586.21%571.43%
tejun heotejun heo413.79%228.57%
Total29100.00%7100.00%

EXPORT_SYMBOL(blk_start_queue); /** * blk_stop_queue - stop a queue * @q: The &struct request_queue in question * * Description: * The Linux block layer assumes that a block driver will consume all * entries on the request queue when the request_fn strategy is called. * Often this will not happen, because of hardware limitations (queue * depth settings). If a device driver gets a 'queue full' response, * or if it simply chooses not to queue more I/O at one point, it can * call this function to prevent the request_fn from being called until * the driver has signalled it's ready to go again. This happens by calling * blk_start_queue() to restart queue operations. Queue lock must be held. **/
void blk_stop_queue(struct request_queue *q) { cancel_delayed_work(&q->delay_work); queue_flag_set(QUEUE_FLAG_STOPPED, q); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2288.00%562.50%
nick pigginnick piggin14.00%112.50%
tejun heotejun heo14.00%112.50%
arnaldo carvalho de meloarnaldo carvalho de melo14.00%112.50%
Total25100.00%8100.00%

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 * that the callbacks might use. The caller must already have made sure * that its ->make_request_fn will not re-add plugging prior to calling * this function. * * This function does not cancel any asynchronous activity arising * out of elevator or throttling code. That would require elevator_exit() * and blkcg_exit_queue() to be called with queue lock initialized. * */
void blk_sync_queue(struct request_queue *q) { del_timer_sync(&q->timeout); if (q->mq_ops) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) { cancel_delayed_work_sync(&hctx->run_work); cancel_delayed_work_sync(&hctx->delay_work); } } else { cancel_delayed_work_sync(&q->delay_work); } }

Contributors

PersonTokensPropCommitsCommitProp
lei minglei ming3447.89%111.11%
jens axboejens axboe2332.39%666.67%
christoph hellwigchristoph hellwig1115.49%111.11%
arnaldo carvalho de meloarnaldo carvalho de melo34.23%111.11%
Total71100.00%9100.00%

EXPORT_SYMBOL(blk_sync_queue); /** * __blk_run_queue_uncond - run a queue whether or not it has been stopped * @q: The queue to run * * Description: * Invoke request handling on a queue if there are any pending requests. * May be used to restart request handling after a request has completed. * This variant runs the queue whether or not the queue has been * stopped. Must be called with the queue lock held and interrupts * disabled. See also @blk_run_queue. */
inline void __blk_run_queue_uncond(struct request_queue *q) { if (unlikely(blk_queue_dead(q))) return; /* * Some request_fn implementations, e.g. scsi_request_fn(), unlock * the queue lock internally. As a result multiple threads may be * running such a request function concurrently. Keep track of the * number of active request_fn invocations such that blk_drain_queue() * can wait until all these request_fn calls have finished. */ q->request_fn_active++; q->request_fn(q); q->request_fn_active--; }

Contributors

PersonTokensPropCommitsCommitProp
bart van asschebart van assche40100.00%2100.00%
Total40100.00%2100.00%

EXPORT_SYMBOL_GPL(__blk_run_queue_uncond); /** * __blk_run_queue - run a single device queue * @q: The queue to run * * Description: * See @blk_run_queue. This variant must be called with the queue lock * held and interrupts disabled. */
void __blk_run_queue(struct request_queue *q) { if (unlikely(blk_queue_stopped(q))) return; __blk_run_queue_uncond(q); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2388.46%666.67%
bart van asschebart van assche13.85%111.11%
pre-gitpre-git13.85%111.11%
nick pigginnick piggin13.85%111.11%
Total26100.00%9100.00%

EXPORT_SYMBOL(__blk_run_queue); /** * blk_run_queue_async - run a single device queue in workqueue context * @q: The queue to run * * Description: * Tells kblockd to perform the equivalent of @blk_run_queue on behalf * of us. The caller must hold the queue lock. */
void blk_run_queue_async(struct request_queue *q) { if (likely(!blk_queue_stopped(q) && !blk_queue_dead(q))) mod_delayed_work(kblockd_workqueue, &q->delay_work, 0); }

Contributors

PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig3282.05%133.33%
bart van asschebart van assche615.38%133.33%
tejun heotejun heo12.56%133.33%
Total39100.00%3100.00%

EXPORT_SYMBOL(blk_run_queue_async); /** * blk_run_queue - run a single device queue * @q: The queue to run * * Description: * Invoke request handling on this queue, if it has pending work to do. * May be used to restart queueing when a request has completed. */
void blk_run_queue(struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); __blk_run_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2670.27%457.14%
nick pigginnick piggin924.32%114.29%
tejun heotejun heo25.41%228.57%
Total37100.00%7100.00%

EXPORT_SYMBOL(blk_run_queue);
void blk_put_queue(struct request_queue *q) { kobject_put(&q->kobj); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe1266.67%480.00%
andrew mortonandrew morton633.33%120.00%
Total18100.00%5100.00%

EXPORT_SYMBOL(blk_put_queue); /** * __blk_drain_queue - drain requests from request_queue * @q: queue to drain * @drain_all: whether to drain all requests or only the ones w/ ELVPRIV * * Drain requests from @q. If @drain_all is set, all requests are drained. * If not, only ELVPRIV requests are drained. The caller is responsible * for ensuring that no new requests which need to be drained are queued. */
static void __blk_drain_queue(struct request_queue *q, bool drain_all) __releases(q->queue_lock) __acquires(q->queue_lock) { int i; lockdep_assert_held(q->queue_lock); while (true) { bool drain = false; /* * The caller might be trying to drain @q before its * elevator is initialized. */ if (q->elevator) elv_drain_elevator(q); blkcg_drain_queue(q); /* * This function might be called on a queue which failed * driver init after queue creation or is not yet fully * active yet. Some drivers (e.g. fd and loop) get unhappy * in such cases. Kick queue iff dispatch queue has * something on it and @q has request_fn set. */ if (!list_empty(&q->queue_head) && q->request_fn) __blk_run_queue(q); drain |= q->nr_rqs_elvpriv; drain |= q->request_fn_active; /* * Unfortunately, requests are queued at and tracked from * multiple places and there's no single counter which can * be drained. Check all the queues and counters. */ if (drain_all) { struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); drain |= !list_empty(&q->queue_head); for (i = 0; i < 2; i++) { drain |= q->nr_rqs[i]; drain |= q->in_flight[i]; if (fq) drain |= !list_empty(&fq->flush_queue[i]); } } if (!drain) break; spin_unlock_irq(q->queue_lock); msleep(10); spin_lock_irq(q->queue_lock); } /* * With queue marked dead, any woken up waiter will fail the * allocation path, so the wakeup chaining is lost and we're * left with hung waiters. We need to wake up those waiters. */ if (q->request_fn) { struct request_list *rl; blk_queue_for_each_rl(rl, q) for (i = 0; i < ARRAY_SIZE(rl->wait); i++) wake_up_all(&rl->wait[i]); } }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo15561.51%861.54%
bart van asschebart van assche4015.87%215.38%
asias heasias he4015.87%17.69%
ming leiming lei176.75%215.38%
Total252100.00%13100.00%

/** * blk_queue_bypass_start - enter queue bypass mode * @q: queue of interest * * In bypass mode, only the dispatch FIFO queue of @q is used. This * function makes @q enter bypass mode and drains all requests which were * throttled or issued before. On return, it's guaranteed that no request * is being throttled or has ELVPRIV set and blk_queue_bypass() %true * inside queue or RCU read lock. */
void blk_queue_bypass_start(struct request_queue *q) { spin_lock_irq(q->queue_lock); q->bypass_depth++; queue_flag_set(QUEUE_FLAG_BYPASS, q); spin_unlock_irq(q->queue_lock); /* * Queues start drained. Skip actual draining till init is * complete. This avoids lenghty delays during queue init which * can happen many times during boot. */ if (blk_queue_init_done(q)) { spin_lock_irq(q->queue_lock); __blk_drain_queue(q, false); spin_unlock_irq(q->queue_lock); /* ensure blk_queue_bypass() is %true inside RCU read lock */ synchronize_rcu(); } }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo5678.87%480.00%
bart van asschebart van assche1521.13%120.00%
Total71100.00%5100.00%

EXPORT_SYMBOL_GPL(blk_queue_bypass_start); /** * blk_queue_bypass_end - leave queue bypass mode * @q: queue of interest * * Leave bypass mode and restore the normal queueing behavior. */
void blk_queue_bypass_end(struct request_queue *q) { spin_lock_irq(q->queue_lock); if (!--q->bypass_depth) queue_flag_clear(QUEUE_FLAG_BYPASS, q); WARN_ON_ONCE(q->bypass_depth < 0); spin_unlock_irq(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo48100.00%1100.00%
Total48100.00%1100.00%

EXPORT_SYMBOL_GPL(blk_queue_bypass_end);
void blk_set_queue_dying(struct request_queue *q) { spin_lock_irq(q->queue_lock); queue_flag_set(QUEUE_FLAG_DYING, q); spin_unlock_irq(q->queue_lock); if (q->mq_ops) blk_mq_wake_waiters(q); else { struct request_list *rl; blk_queue_for_each_rl(rl, q) { if (rl->rq_pool) { wake_up(&rl->wait[BLK_RW_SYNC]); wake_up(&rl->wait[BLK_RW_ASYNC]); } } } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7382.95%150.00%
bart van asschebart van assche1517.05%150.00%
Total88100.00%2100.00%

EXPORT_SYMBOL_GPL(blk_set_queue_dying); /** * blk_cleanup_queue - shutdown a request queue * @q: request queue to shutdown * * Mark @q DYING, drain all pending requests, mark @q DEAD, destroy and * put it. All future requests will be failed immediately with -ENODEV. */
void blk_cleanup_queue(struct request_queue *q) { spinlock_t *lock = q->queue_lock; /* mark @q DYING, no new request or merges will be allowed afterwards */ mutex_lock(&q->sysfs_lock); blk_set_queue_dying(q); spin_lock_irq(lock); /* * A dying queue is permanently in bypass mode till released. Note * 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. */ q->bypass_depth++; queue_flag_set(QUEUE_FLAG_BYPASS, q); queue_flag_set(QUEUE_FLAG_NOMERGES, q); queue_flag_set(QUEUE_FLAG_NOXMERGES, q); queue_flag_set(QUEUE_FLAG_DYING, q); spin_unlock_irq(lock); mutex_unlock(&q->sysfs_lock); /* * Drain all requests queued before DYING marking. Set DEAD flag to * prevent that q->request_fn() gets invoked after draining finished. */ blk_freeze_queue(q); spin_lock_irq(lock); if (!q->mq_ops) __blk_drain_queue(q, true); queue_flag_set(QUEUE_FLAG_DEAD, q); spin_unlock_irq(lock); /* for synchronous bio-based driver finish in-flight integrity i/o */ blk_flush_integrity(); /* @q won't process any more request, flush async actions */ del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer); blk_sync_queue(q); if (q->mq_ops) blk_mq_free_queue(q); percpu_ref_exit(&q->q_usage_counter); spin_lock_irq(lock); if (q->queue_lock != &q->__queue_lock) q->queue_lock = &q->__queue_lock; spin_unlock_irq(lock); bdi_unregister(&q->backing_dev_info); /* @q is and will stay empty, shutdown and put */ blk_put_queue(q); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo7637.25%314.29%
asias heasias he3014.71%14.76%
bart van asschebart van assche2813.73%419.05%
jens axboejens axboe2311.27%733.33%
dan williamsdan williams209.80%29.52%
lei minglei ming94.41%14.76%
neil brownneil brown73.43%14.76%
andrew mortonandrew morton73.43%14.76%
vivek goyalvivek goyal41.96%14.76%
Total204100.00%21100.00%

EXPORT_SYMBOL(blk_cleanup_queue); /* Allocate memory local to the request queue */
static void *alloc_request_struct(gfp_t gfp_mask, void *data) { int nid = (int)(long)data; return kmem_cache_alloc_node(request_cachep, gfp_mask, nid); }

Contributors

PersonTokensPropCommitsCommitProp
david rientjesdavid rientjes35100.00%1100.00%
Total35100.00%1100.00%


static void free_request_struct(void *element, void *unused) { kmem_cache_free(request_cachep, element); }

Contributors

PersonTokensPropCommitsCommitProp
david rientjesdavid rientjes21100.00%1100.00%
Total21100.00%1100.00%


int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) { if (unlikely(rl->rq_pool)) return 0; rl->q = q; rl->count[BLK_RW_SYNC] = rl->count[BLK_RW_ASYNC] = 0; rl->starved[BLK_RW_SYNC] = rl->starved[BLK_RW_ASYNC] = 0; init_waitqueue_head(&rl->wait[BLK_RW_SYNC]); init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]); rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_struct, free_request_struct, (void *)(long)q->node, gfp_mask, q->node); if (!rl->rq_pool) return -ENOMEM; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe8261.19%743.75%
tejun heotejun heo2216.42%425.00%
david rientjesdavid rientjes128.96%16.25%
mike snitzermike snitzer85.97%16.25%
pre-gitpre-git53.73%16.25%
andrew mortonandrew morton42.99%16.25%
linus torvaldslinus torvalds10.75%16.25%
Total134100.00%16100.00%


void blk_exit_rl(struct request_list *rl) { if (rl->rq_pool) mempool_destroy(rl->rq_pool); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo23100.00%1100.00%
Total23100.00%1100.00%


struct request_queue *blk_alloc_queue(gfp_t gfp_mask) { return blk_alloc_queue_node(gfp_mask, NUMA_NO_NODE); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe1688.89%250.00%
ezequiel garciaezequiel garcia15.56%125.00%
linus torvaldslinus torvalds15.56%125.00%
Total18100.00%4100.00%

EXPORT_SYMBOL(blk_alloc_queue);
int blk_queue_enter(struct request_queue *q, bool nowait) { while (true) { int ret; if (percpu_ref_tryget_live(&q->q_usage_counter)) return 0; if (nowait) return -EBUSY; ret = wait_event_interruptible(q->mq_freeze_wq, !atomic_read(&q->mq_freeze_depth) || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; if (ret) return ret; } }

Contributors

PersonTokensPropCommitsCommitProp
dan williamsdan williams8196.43%150.00%
christoph hellwigchristoph hellwig33.57%150.00%
Total84100.00%2100.00%


void blk_queue_exit(struct request_queue *q) { percpu_ref_put(&q->q_usage_counter); }

Contributors

PersonTokensPropCommitsCommitProp
dan williamsdan williams18100.00%1100.00%
Total18100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
dan williamsdan williams34100.00%1100.00%
Total34100.00%1100.00%


static void blk_rq_timed_out_timer(unsigned long data) { struct request_queue *q = (struct request_queue *)data; kblockd_schedule_work(&q->timeout_work); }

Contributors

PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig30100.00%1100.00%
Total30100.00%1100.00%


struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) { struct request_queue *q; int err; q = kmem_cache_alloc_node(blk_requestq_cachep, gfp_mask | __GFP_ZERO, node_id); if (!q) return NULL; q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask); if (q->id < 0) goto fail_q; q->bio_split = bioset_create(BIO_POOL_SIZE, 0); if (!q->bio_split) goto fail_id; q->backing_dev_info.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; q->backing_dev_info.capabilities = BDI_CAP_CGROUP_WRITEBACK; q->backing_dev_info.name = "block"; q->node = node_id; err = bdi_init(&q->backing_dev_info); if (err) goto fail_split; setup_timer(&q->backing_dev_info.laptop_mode_wb_timer, laptop_mode_timer_fn, (unsigned long) q); setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); INIT_LIST_HEAD(&q->queue_head); INIT_LIST_HEAD(&q->timeout_list); INIT_LIST_HEAD(&q->icq_list); #ifdef CONFIG_BLK_CGROUP INIT_LIST_HEAD(&q->blkg_list); #endif INIT_DELAYED_WORK(&q->delay_work, blk_delay_work); kobject_init(&q->kobj, &blk_queue_ktype); mutex_init(&q->sysfs_lock); spin_lock_init(&q->__queue_lock); /* * By default initialize queue_lock to internal lock and driver can * override it later if need be. */ q->queue_lock = &q->__queue_lock; /* * A queue starts its life with bypass turned on to avoid * unnecessary bypass on/off overhead and nasty surprises during * init. The initial bypass will be finished when the queue is * registered by blk_register_queue(). */ q->bypass_depth = 1; __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); init_waitqueue_head(&q->mq_freeze_wq); /* * 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)) goto fail_bdi; if (blkcg_init_queue(q)) goto fail_ref; return q; fail_ref: percpu_ref_exit(&q->q_usage_counter); fail_bdi: bdi_destroy(&q->backing_dev_info); fail_split: bioset_free(q->bio_split); fail_id: ida_simple_remove(&blk_queue_ida, q->id); fail_q: kmem_cache_free(blk_requestq_cachep, q); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe12734.14%1030.30%
tejun heotejun heo10628.49%927.27%
dan williamsdan williams318.33%13.03%
kent overstreetkent overstreet318.33%13.03%
matthew garrettmatthew garrett184.84%13.03%
linus torvaldslinus torvalds112.96%13.03%
andrew mortonandrew morton112.96%13.03%
mikulas patockamikulas patocka112.96%13.03%
neil brownneil brown82.15%13.03%
peter zijlstrapeter zijlstra71.88%13.03%
mike snitzermike snitzer61.61%13.03%
nick pigginnick piggin20.54%26.06%
kirill a. shutemovkirill a. shutemov10.27%13.03%
lei minglei ming10.27%13.03%
dan carpenterdan carpenter10.27%13.03%
Total372100.00%33100.00%

EXPORT_SYMBOL(blk_alloc_queue_node); /** * blk_init_queue - prepare a request queue for use with a block device * @rfn: The function to be called to process requests that have been * placed on the queue. * @lock: Request queue spin lock * * Description: * If a block device wishes to use the standard request handling procedures, * which sorts requests and coalesces adjacent requests, then it must * call blk_init_queue(). The function @rfn will be called when there * are requests on the queue that need to be processed. If the device * supports plugging, then @rfn may not be called immediately when requests * are available on the queue, but may be called at some time later instead. * Plugged queues are generally unplugged when a buffer belonging to one * of the requests on the queue is needed, or due to memory pressure. * * @rfn is not required, or even expected, to remove all requests off the * queue, but only as many as it can handle at a time. If it does leave * requests on the queue, it is responsible for arranging that the requests * get dealt with eventually. * * The queue spin lock must be held while manipulating the requests on the * request queue; this lock will be taken also from interrupt context, so irq * disabling is needed for it. * * Function returns a pointer to the initialized request queue, or %NULL if * it didn't succeed. * * Note: * blk_init_queue() must be paired with a blk_cleanup_queue() call * when the block device is deactivated (such as at module unload). **/
struct request_queue *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock) { return blk_init_queue_node(rfn, lock, NUMA_NO_NODE); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2392.00%360.00%
ezequiel garciaezequiel garcia14.00%120.00%
martin daleckimartin dalecki14.00%120.00%
Total25100.00%5100.00%

EXPORT_SYMBOL(blk_init_queue);
struct request_queue * blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { struct request_queue *uninit_q, *q; uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id); if (!uninit_q) return NULL; q = blk_init_allocated_queue(uninit_q, rfn, lock); if (!q) blk_cleanup_queue(uninit_q); return q; }

Contributors

PersonTokensPropCommitsCommitProp
mike snitzermike snitzer4059.70%450.00%
jens axboejens axboe2334.33%337.50%
martin daleckimartin dalecki45.97%112.50%
Total67100.00%8100.00%

EXPORT_SYMBOL(blk_init_queue_node); static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio);
struct request_queue * blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn, spinlock_t *lock) { if (!q) return NULL; q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, 0); if (!q->fq) return NULL; if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) goto fail; INIT_WORK(&q->timeout_work, blk_timeout_work); q->request_fn = rfn; q->prep_rq_fn = NULL; q->unprep_rq_fn = NULL; q->queue_flags |= QUEUE_FLAG_DEFAULT; /* Override internal queue lock with supplied lock pointer */ if (lock) q->queue_lock = lock; /* * This also sets hw/phys segments, boundary and size */ blk_queue_make_request(q, blk_queue_bio); q->sg_reserved_size = INT_MAX; /* Protect q->elevator from elevator_change */ mutex_lock(&q->sysfs_lock); /* init elevator */ if (elevator_init(q, NULL)) { mutex_unlock(&q->sysfs_lock); goto fail; } mutex_unlock(&q->sysfs_lock); return q; fail: blk_free_flush_queue(q->fq); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6334.62%836.36%
mike snitzermike snitzer3619.78%29.09%
tomoki sekiyamatomoki sekiyama2714.84%14.55%
dave jonesdave jones168.79%14.55%
tejun heotejun heo116.04%418.18%
christoph hellwigchristoph hellwig105.49%14.55%
ming leiming lei84.40%29.09%
james bottomleyjames bottomley63.30%14.55%
nick pigginnick piggin42.20%14.55%
martin daleckimartin dalecki10.55%14.55%
Total182100.00%22100.00%

EXPORT_SYMBOL(blk_init_allocated_queue);
bool blk_get_queue(struct request_queue *q) { if (likely(!blk_queue_dying(q))) { __blk_get_queue(q); return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2985.29%571.43%
tejun heotejun heo411.76%114.29%
bart van asschebart van assche12.94%114.29%
Total34100.00%7100.00%

EXPORT_SYMBOL(blk_get_queue);
static inline void blk_free_request(struct request_list *rl, struct request *rq) { if (rq->cmd_flags & REQ_ELVPRIV) { elv_put_request(rl->q, rq); if (rq->elv.icq) put_io_context(rq->elv.icq->ioc); } mempool_free(rq, rl->rq_pool); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo2640.62%228.57%
jens axboejens axboe1726.56%342.86%
martin daleckimartin dalecki1218.75%114.29%
linus torvaldslinus torvalds914.06%114.29%
Total64100.00%7100.00%

/* * ioc_batching returns true if the ioc is a valid batching request and * should be given priority access to a request. */
static inline int ioc_batching(struct request_queue *q, struct io_context *ioc) { if (!ioc) return 0; /* * Make sure the process is able to allocate at least 1 request * even if the batch times out, otherwise we could theoretically * lose wakeups. */ return ioc->nr_batch_requests == q->nr_batching || (ioc->nr_batch_requests > 0 && time_before(jiffies, ioc->last_waited + BLK_BATCH_TIME)); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5398.15%480.00%
mike christiemike christie11.85%120.00%
Total54100.00%5100.00%

/* * ioc_set_batching sets ioc to be a new "batcher" if it is not one. This * will cause the process to be a "batcher" on all queues in the system. This * is the behaviour we want though - once it gets a wakeup it should be given * a nice run. */
static void ioc_set_batching(struct request_queue *q, struct io_context *ioc) { if (!ioc || ioc_batching(q, ioc)) return; ioc->nr_batch_requests = q->nr_batching; ioc->last_waited = jiffies; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe43100.00%4100.00%
Total43100.00%4100.00%


static void __freed_request(struct request_list *rl, int sync) { struct request_queue *q = rl->q; if (rl->count[sync] < queue_congestion_off_threshold(q)) blk_clear_congested(rl, sync); if (rl->count[sync] + 1 <= q->nr_requests) { if (waitqueue_active(&rl->wait[sync])) wake_up(&rl->wait[sync]); blk_clear_rl_full(rl, sync); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7783.70%666.67%
tejun heotejun heo1010.87%222.22%
mike christiemike christie55.43%111.11%
Total92100.00%9100.00%

/* * A request has just been released. Account for it, update the full and * congestion status, wake up any waiters. Called under q->queue_lock. */
static void freed_request(struct request_list *rl, int op, unsigned int flags) { struct request_queue *q = rl->q; int sync = rw_is_sync(op, flags); q->nr_rqs[sync]--; rl->count[sync]--; if (flags & REQ_ELVPRIV) q->nr_rqs_elvpriv--; __freed_request(rl, sync); if (unlikely(rl->starved[sync ^ 1])) __freed_request(rl, sync ^ 1); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe4648.94%440.00%
tejun heotejun heo3132.98%330.00%
mike christiemike christie1212.77%110.00%
michael christiemichael christie55.32%220.00%
Total94100.00%10100.00%


int blk_update_nr_requests(struct request_queue *q, unsigned int nr) { struct request_list *rl; int on_thresh, off_thresh; spin_lock_irq(q->queue_lock); q->nr_requests = nr; blk_queue_congestion_threshold(q); on_thresh = queue_congestion_on_threshold(q); off_thresh = queue_congestion_off_threshold(q); blk_queue_for_each_rl(rl, q) { if (rl->count[BLK_RW_SYNC] >= on_thresh) blk_set_congested(rl, BLK_RW_SYNC); else if (rl->count[BLK_RW_SYNC] < off_thresh) blk_clear_congested(rl, BLK_RW_SYNC); if (rl->count[BLK_RW_ASYNC] >= on_thresh) blk_set_congested(rl, BLK_RW_ASYNC); else if (rl->count[BLK_RW_ASYNC] < off_thresh) blk_clear_congested(rl, BLK_RW_ASYNC); if (rl->count[BLK_RW_SYNC] >= q->nr_requests) { blk_set_rl_full(rl, BLK_RW_SYNC); } else { blk_clear_rl_full(rl, BLK_RW_SYNC); wake_up(&rl->wait[BLK_RW_SYNC]); } if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) { blk_set_rl_full(rl, BLK_RW_ASYNC); } else { blk_clear_rl_full(rl, BLK_RW_ASYNC); wake_up(&rl->wait[BLK_RW_ASYNC]); } } spin_unlock_irq(q->queue_lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe20085.47%150.00%
tejun heotejun heo3414.53%150.00%
Total234100.00%2100.00%

/* * Determine if elevator data should be initialized when allocating the * request associated with @bio. */
static bool blk_rq_should_init_elevator(struct bio *bio) { if (!bio) return true; /* * Flush requests do not use the elevator so skip initialization. * This allows a request to share the flush and elevator data. */ if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
mike snitzermike snitzer3694.74%133.33%
jens axboejens axboe12.63%133.33%
michael christiemichael christie12.63%133.33%
Total38100.00%3100.00%

/** * rq_ioc - determine io_context for request allocation * @bio: request being allocated is for this bio (can be %NULL) * * Determine io_context to use for request allocation for @bio. May return * %NULL if %current->io_context doesn't exist. */
static struct io_context *rq_ioc(struct bio *bio) { #ifdef CONFIG_BLK_CGROUP if (bio && bio->bi_ioc) return bio->bi_ioc; #endif return current->io_context; }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo36100.00%1100.00%
Total36100.00%1100.00%

/** * __get_request - get a free request * @rl: request list to allocate from * @op: REQ_OP_READ/REQ_OP_WRITE * @op_flags: rq_flag_bits * @bio: bio to allocate request for (can be %NULL) * @gfp_mask: allocation mask * * Get a free request from @q. This function may fail under memory * pressure or if @q is dead. * * Must be called with @q->queue_lock held and, * Returns ERR_PTR on failure, with @q->queue_lock held. * Returns request pointer on success, with @q->queue_lock *not held*. */
static struct request *__get_request(struct request_list *rl, int op, int op_flags, struct bio *bio, gfp_t gfp_mask) { struct request_queue *q = rl->q; struct request *rq; struct elevator_type *et = q->elevator->type; struct io_context *ioc = rq_ioc(bio); struct io_cq *icq = NULL; const bool is_sync = rw_is_sync(op, op_flags) != 0; int may_queue; if (unlikely(blk_queue_dying(q))) return ERR_PTR(-ENODEV); may_queue = elv_may_queue(q, op, op_flags); if (may_queue == ELV_MQUEUE_NO) goto rq_starved; if (rl->count[is_sync]+1 >= queue_congestion_on_threshold(q)) { if (rl->count[is_sync]+1 >= q->nr_requests) { /* * The queue will fill after this allocation, so set * it as full, and mark this process as "batching". * This process will be allowed to complete a batch of * requests, others will be blocked. */ if (!blk_rl_full(rl, is_sync)) { ioc_set_batching(q, ioc); blk_set_rl_full(rl, is_sync); } else { if (may_queue != ELV_MQUEUE_MUST && !ioc_batching(q, ioc)) { /* * The queue is full and the allocating * process is not a "batcher", and not * exempted by the IO scheduler */ return ERR_PTR(-ENOMEM); } } } blk_set_congested(rl, is_sync); } /* * Only allow batching queuers to allocate up to 50% over the defined * limit of requests, otherwise we could have thousands of requests * allocated with any setting of ->nr_requests */ if (rl->count[is_sync] >= (3 * q->nr_requests / 2)) return ERR_PTR(-ENOMEM); q->nr_rqs[is_sync]++; rl->count[is_sync]++; rl->starved[is_sync] = 0; /* * Decide whether the new request will be managed by elevator. If * so, mark @op_flags and increment elvpriv. Non-zero elvpriv will * prevent the current elevator from being destroyed until the new * request is freed. This guarantees icq's won't be destroyed and * makes creating new ones safe. * * Also, lookup icq while holding queue_lock. If it doesn't exist, * it will be created after releasing queue_lock. */ if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) { op_flags |= REQ_ELVPRIV; q->nr_rqs_elvpriv++; if (et->icq_cache && ioc) icq = ioc_lookup_icq(ioc, q); } if (blk_queue_io_stat(q)) op_flags |= REQ_IO_STAT; spin_unlock_irq(q->queue_lock); /* allocate and init request */ rq = mempool_alloc(rl->rq_pool, gfp_mask); if (!rq) goto fail_alloc; blk_rq_init(q, rq); blk_rq_set_rl(rq, rl); req_set_op_attrs(rq, op, op_flags | REQ_ALLOCED); /* init elvpriv */ if (op_flags & REQ_ELVPRIV) { if (unlikely(et->icq_cache && !icq)) { if (ioc) icq = ioc_create_icq(ioc, q, gfp_mask); if (!icq) goto fail_elvpriv; } rq->elv.icq = icq; if (unlikely(elv_set_request(q, rq, bio, gfp_mask))) goto fail_elvpriv; /* @rq->elv.icq holds io_context until @rq is freed */ if (icq) get_io_context(icq->ioc); } out: /* * ioc may be NULL here, and ioc_batching will be false. That's * OK, if the queue is under the request limit then requests need * not count toward the nr_batch_requests limit. There will always * be some limit enforced by BLK_BATCH_TIME. */ if (ioc_batching(q, ioc)) ioc->nr_batch_requests--; trace_block_getrq(q, bio, op); return rq; fail_elvpriv: /* * elvpriv init failed. ioc, icq and elvpriv aren't mempool backed * and may fail indefinitely under memory pressure and thus * shouldn't stall IO. Treat this request as !elvpriv. This will * disturb iosched and blkcg but weird is bettern than dead. */ printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed\n", __func__, dev_name(q->backing_dev_info.dev)); rq->cmd_flags &= ~REQ_ELVPRIV; rq->elv.icq = NULL; spin_lock_irq(q->queue_lock); q->nr_rqs_elvpriv--; spin_unlock_irq(q->queue_lock); goto out; fail_alloc: /* * Allocation failed presumably due to memory. Undo anything we * might have messed up. * * Allocating task should really be put onto the front of the wait * queue, but this is pretty rare. */ spin_lock_irq(q->queue_lock); freed_request(rl, op, op_flags); /* * in the very unlikely event that allocation failed and no * requests for this direction was pending, mark us starved so that * freeing of a request in the other direction will notice * us. another possible fix would be to split the rq mempool into * READ and WRITE */ rq_starved: if (unlikely(rl->count[is_sync] == 0)) rl->starved[is_sync] = 1; return ERR_PTR(-ENOMEM); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo28247.16%1443.75%
jens axboejens axboe22237.12%618.75%
michael christiemichael christie254.18%39.38%
joe lawrencejoe lawrence203.34%13.12%
mike christiemike christie122.01%26.25%
jerome marchandjerome marchand101.67%13.12%
james bottomleyjames bottomley101.67%13.12%
mike snitzermike snitzer71.17%13.12%
li shaohuali shaohua61.00%13.12%
robert elliottrobert elliott30.50%13.12%
bart van asschebart van assche10.17%13.12%
Total598100.00%32100.00%

/** * get_request - get a free request * @q: request_queue to allocate request from * @op: REQ_OP_READ/REQ_OP_WRITE * @op_flags: rq_flag_bits * @bio: bio to allocate request for (can be %NULL) * @gfp_mask: allocation mask * * Get a free request from @q. If %__GFP_DIRECT_RECLAIM is set in @gfp_mask, * this function keeps retrying under memory pressure and fails iff @q is dead. * * Must be called with @q->queue_lock held and, * Returns ERR_PTR on failure, with @q->queue_lock held. * Returns request pointer on success, with @q->queue_lock *not held*. */
static struct request *get_request(struct request_queue *q, int op, int op_flags, struct bio *bio, gfp_t gfp_mask) { const bool is_sync = rw_is_sync(op, op_flags) != 0; DEFINE_WAIT(wait); struct request_list *rl; struct request *rq; rl = blk_get_rl(q, bio); /* transferred to @rq on success */ retry: rq = __get_request(rl, op, op_flags, bio, gfp_mask); if (!IS_ERR(rq)) return rq; if (!gfpflags_allow_blocking(gfp_mask) || unlikely(blk_queue_dying(q))) { blk_put_rl(rl); return rq; } /* wait on @rl and retry */ prepare_to_wait_exclusive(&rl->wait[is_sync], &wait, TASK_UNINTERRUPTIBLE); trace_block_sleeprq(q, bio, op); spin_unlock_irq(q->queue_lock); io_schedule(); /* * After sleeping, we become a "batching" process and will be able * to allocate at least one request, and up to a big batch of them * for a small period time. See ioc_batching, ioc_set_batching */ ioc_set_batching(q, current->io_context); spin_lock_irq(q->queue_lock); finish_wait(&rl->wait[is_sync], &wait); goto retry; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe9751.32%529.41%
tejun heotejun heo6132.28%423.53%
michael christiemichael christie115.82%211.76%
james bottomleyjames bottomley84.23%15.88%
joe lawrencejoe lawrence52.65%15.88%
mel gormanmel gorman31.59%15.88%
andrew mortonandrew morton21.06%15.88%
arnaldo carvalho de meloarnaldo carvalho de melo10.53%15.88%
bart van asschebart van assche10.53%15.88%
Total189100.00%17100.00%


static struct request *blk_old_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) { struct request *rq; BUG_ON(rw != READ && rw != WRITE); /* create ioc upfront */ create_io_context(gfp_mask, q->node); spin_lock_irq(q->queue_lock); rq = get_request(q, rw, 0, NULL, gfp_mask); if (IS_ERR(rq)) { spin_unlock_irq(q->queue_lock); return rq; } /* q->queue_lock is unlocked at this point */ rq->__data_len = 0; rq->__sector = (sector_t) -1; rq->bio = rq->biotail = NULL; return rq; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7060.34%555.56%
christoph hellwigchristoph hellwig3126.72%111.11%
tejun heotejun heo108.62%111.11%
joe lawrencejoe lawrence32.59%111.11%
michael christiemichael christie21.72%111.11%
Total116100.00%9100.00%


struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) { if (q->mq_ops) return blk_mq_alloc_request(q, rw, (gfp_mask & __GFP_DIRECT_RECLAIM) ? 0 : BLK_MQ_REQ_NOWAIT); else return blk_old_get_request(q, rw, gfp_mask); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe4584.91%150.00%
christoph hellwigchristoph hellwig815.09%150.00%
Total53100.00%2100.00%

EXPORT_SYMBOL(blk_get_request); /** * blk_rq_set_block_pc - initialize a request to type BLOCK_PC * @rq: request to be initialized * */
void blk_rq_set_block_pc(struct request *rq) { rq->cmd_type = REQ_TYPE_BLOCK_PC; memset(rq->__cmd, 0, sizeof(rq->__cmd)); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe32100.00%1100.00%
Total32100.00%1100.00%

EXPORT_SYMBOL(blk_rq_set_block_pc); /** * blk_requeue_request - put a request back on queue * @q: request queue where request should be inserted * @rq: request to be inserted * * Description: * Drivers often keep queueing requests until the hardware cannot accept * more, when that condition happens we need to put the request back * on the queue. Must be called with queue lock held. */
void blk_requeue_request(struct request_queue *q, struct request *rq) { blk_delete_timer(rq); blk_clear_rq_complete(rq); trace_block_rq_requeue(q, rq); if (rq->cmd_flags & REQ_QUEUED) blk_queue_end_tag(q, rq); BUG_ON(blk_queued_rq(rq)); elv_requeue_request(q, rq); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe3353.23%321.43%
pre-gitpre-git914.52%535.71%
james bottomleyjames bottomley812.90%17.14%
christoph hellwigchristoph hellwig46.45%17.14%
linus torvaldslinus torvalds34.84%17.14%
andrew mortonandrew morton23.23%17.14%
al viroal viro23.23%17.14%
arnaldo carvalho de meloarnaldo carvalho de melo11.61%17.14%
Total62100.00%14100.00%

EXPORT_SYMBOL(blk_requeue_request);
static void add_acct_request(struct request_queue *q, struct request *rq, int where) { blk_account_io_start(rq, true); __elv_add_request(q, rq, where); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe3085.71%466.67%
mike christiemike christie514.29%233.33%
Total35100.00%6100.00%


static void part_round_stats_single(int cpu, struct hd_struct *part, unsigned long now) { int inflight; if (now == part->stamp) return; inflight = part_in_flight(part); if (inflight) { __part_stat_add(cpu, part, time_in_queue, inflight * (now - part->stamp)); __part_stat_add(cpu, part, io_ticks, (now - part->stamp)); } part->stamp = now; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5969.41%562.50%
tejun heotejun heo2327.06%225.00%
nikanth karthikesannikanth karthikesan33.53%112.50%
Total85100.00%8100.00%

/** * part_round_stats() - Round off the performance stats on a struct disk_stats. * @cpu: cpu number for stats access * @part: target partition * * 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. */
void part_round_stats(int cpu, struct hd_struct *part) { unsigned long now = jiffies; if (part->partno) part_round_stats_single(cpu, &part_to_disk(part)->part0, now); part_round_stats_single(cpu, part, now); }

Contributors

PersonTokensPropCommitsCommitProp
jerome marchandjerome marchand3367.35%133.33%
tejun heotejun heo1632.65%266.67%
Total49100.00%3100.00%

EXPORT_SYMBOL_GPL(part_round_stats); #ifdef CONFIG_PM
static void blk_pm_put_request(struct request *rq) { if (rq->q->dev && !(rq->cmd_flags & REQ_PM) && !--rq->q->nr_pending) pm_runtime_mark_last_busy(rq->q->dev); }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming45100.00%1100.00%
Total45100.00%1100.00%

#else
static inline void blk_pm_put_request(struct request *rq) {}

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming11100.00%1100.00%
Total11100.00%1100.00%

#endif /* * queue lock must be held */
void __blk_put_request(struct request_queue *q, struct request *req) { if (unlikely(!q)) return; if (q->mq_ops) { blk_mq_free_request(req); return; } blk_pm_put_request(req); elv_completed_request(q, req); /* this is a bio leak */ WARN_ON(req->bio != NULL); /* * Request may not have originated from ll_rw_blk. if not, * it didn't come out of our reserved rq pools */ if (req->cmd_flags & REQ_ALLOCED) { unsigned int flags = req->cmd_flags; int op = req_op(req); struct request_list *rl = blk_rq_rl(req); BUG_ON(!list_empty(&req->queuelist)); BUG_ON(ELV_ON_HASH(req)); blk_free_request(rl, req); freed_request(rl, op, flags); blk_put_rl(rl); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6547.10%423.53%
tejun heotejun heo2014.49%211.76%
christoph hellwigchristoph hellwig1410.14%15.88%
boaz harroshboaz harrosh107.25%15.88%
michael christiemichael christie107.25%15.88%
pre-gitpre-git75.07%317.65%
lin minglin ming53.62%15.88%
linus torvaldslinus torvalds53.62%317.65%
al viroal viro21.45%15.88%
Total138100.00%17100.00%

EXPORT_SYMBOL_GPL(__blk_put_request);
void blk_put_request(struct request *req) { struct request_queue *q = req->q; if (q->mq_ops) blk_mq_free_request(req); else { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); __blk_put_request(q, req); spin_unlock_irqrestore(q->queue_lock, flags); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5995.16%583.33%
pre-gitpre-git34.84%116.67%
Total62100.00%6100.00%

EXPORT_SYMBOL(blk_put_request); /** * blk_add_request_payload - add a payload to a request * @rq: request to update * @page: page backing the payload * @offset: offset in page * @len: length of the payload. * * This allows to later add a payload to an already submitted request by * a block driver. The driver needs to take care of freeing the payload * itself. * * Note that this is a quite horrible hack and nothing but handling of * discard requests should ever use it. */
void blk_add_request_payload(struct request *rq, struct page *page, int offset, unsigned int len) { struct bio *bio = rq->bio; bio->bi_io_vec->bv_page = page; bio->bi_io_vec->bv_offset = offset; bio->bi_io_vec->bv_len = len; bio->bi_iter.bi_size = len; bio->bi_vcnt = 1; bio->bi_phys_segments = 1; rq->__data_len = rq->resid_len = len; rq->nr_phys_segments = 1; }

Contributors

PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig8593.41%133.33%
ming linming lin44.40%133.33%
kent overstreetkent overstreet22.20%133.33%
Total91100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_add_request_payload);
bool bio_attempt_back_merge(struct request_queue *q, struct request *req, struct bio *bio) { const int ff = bio->bi_opf & REQ_FAILFAST_MASK; if (!ll_back_merge_fn(q, req, bio)) return false; trace_block_bio_backmerge(q, req, bio); if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); 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)); blk_account_io_start(req, false); return true; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe10586.78%947.37%
tejun heotejun heo64.96%315.79%
pre-gitpre-git43.31%315.79%
kent overstreetkent overstreet21.65%15.26%
jerome marchandjerome marchand21.65%15.26%
linus torvaldslinus torvalds10.83%15.26%
christoph hellwigchristoph hellwig10.83%15.26%
Total121100.00%19100.00%


bool bio_attempt_front_merge(struct request_queue *q, struct request *req, struct bio *bio) { const int ff = bio->bi_opf & REQ_FAILFAST_MASK; if (!ll_front_merge_fn(q, req, bio)) return false; trace_block_bio_frontmerge(q, req, bio); if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff) blk_rq_set_mixed_merge(req); bio->bi_next = req->bio; req->bio = bio; req->__sector = bio->bi_iter.bi_sector; req->__data_len += bio->bi_iter.bi_size; req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); blk_account_io_start(req, false); return true; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe9673.28%1164.71%
tejun heotejun heo2720.61%317.65%
kent overstreetkent overstreet43.05%15.88%
linus torvaldslinus torvalds21.53%15.88%
pre-gitpre-git21.53%15.88%
Total131100.00%17100.00%

/** * blk_attempt_plug_merge - try to merge with %current's plugged list * @q: request_queue new bio is being queued at * @bio: new bio being queued * @request_count: out parameter for number of traversed plugged requests * @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) * * 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. * * 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. * * Caller must ensure !blk_queue_nomerges(q) beforehand. */
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, unsigned int *request_count, struct request **same_queue_rq) { struct blk_plug *plug; struct request *rq; bool ret = false; struct list_head *plug_list; plug = current->plug; if (!plug) goto out; *request_count = 0; if (q->mq_ops) plug_list = &plug->mq_list; else plug_list = &plug->list; list_for_each_entry_reverse(rq, plug_list, queuelist) { int el_ret; if (rq->q == q) { (*request_count)++; /* * 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; } if (rq->q != q || !blk_rq_merge_ok(rq, bio)) continue; el_ret = blk_try_merge(rq, bio); if (el_ret == ELEVATOR_BACK_MERGE) { ret = bio_attempt_back_merge(q, rq, bio); if (ret) break; } else if (el_ret == ELEVATOR_FRONT_MERGE) { ret = bio_attempt_front_merge(q, rq, bio); if (ret) break; } } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe9445.85%736.84%
shaohua lishaohua li5325.85%315.79%
christoph hellwigchristoph hellwig199.27%15.26%
tejun heotejun heo188.78%421.05%
li shaohuali shaohua167.80%15.26%
pre-gitpre-git31.46%210.53%
divyesh shahdivyesh shah20.98%15.26%
Total205100.00%19100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jeff moyerjeff moyer93100.00%1100.00%
Total93100.00%1100.00%


void init_request_from_bio(struct request *req, struct bio *bio) { req->cmd_type = REQ_TYPE_FS; req->cmd_flags |= bio->bi_opf & REQ_COMMON_MASK; if (bio->bi_opf & REQ_RAHEAD) req->cmd_flags |= REQ_FAILFAST_MASK; req->errors = 0; req->__sector = bio->bi_iter.bi_sector; req->ioprio = bio_prio(bio); blk_rq_bio_prep(req->q, req, bio); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5669.14%535.71%
tejun heotejun heo911.11%321.43%
divyesh shahdivyesh shah78.64%17.14%
christoph hellwigchristoph hellwig44.94%17.14%
pre-gitpre-git22.47%214.29%
kent overstreetkent overstreet22.47%17.14%
linus torvaldslinus torvalds11.23%17.14%
Total81100.00%14100.00%


static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) { const bool sync = !!(bio->bi_opf & REQ_SYNC); struct blk_plug *plug; int el_ret, rw_flags = 0, where = ELEVATOR_INSERT_SORT; struct request *req; unsigned int request_count = 0; /* * low level driver can indicate that it wants pages above a * certain limit bounced to low memory (ie for highmem, or even * ISA dma in theory) */ blk_queue_bounce(q, &bio); blk_queue_split(q, &bio, q->bio_split); if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { bio->bi_error = -EIO; bio_endio(bio); return BLK_QC_T_NONE; } if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) { spin_lock_irq(q->queue_lock); where = ELEVATOR_INSERT_FLUSH; goto get_rq; } /* * Check if we can merge with the plugged list before grabbing * any locks. */ if (!blk_queue_nomerges(q)) { if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) return BLK_QC_T_NONE; } else request_count = blk_plug_queued_count(q); spin_lock_irq(q->queue_lock); el_ret = elv_merge(q, &req, bio); if (el_ret == ELEVATOR_BACK_MERGE) { if (bio_attempt_back_merge(q, req, bio)) { elv_bio_merged(q, req, bio); if (!attempt_back_merge(q, req)) elv_merged_request(q, req, el_ret); goto out_unlock; } } else if (el_ret == ELEVATOR_FRONT_MERGE) { if (bio_attempt_front_merge(q, req, bio)) { elv_bio_merged(q, req, bio); if (!attempt_front_merge(q, req)) elv_merged_request(q, req, el_ret); goto out_unlock; } } get_rq: /* * This sync check and mask will be re-done in init_request_from_bio(), * but we need to set it earlier to expose the sync flag to the * rq allocator and io schedulers. */ if (sync) rw_flags |= REQ_SYNC; /* * Add in META/PRIO flags, if set, before we get to the IO scheduler */ rw_flags |= (bio->bi_opf & (REQ_META | REQ_PRIO)); /* * Grab a free request. This is might sleep but can not fail. * Returns with the queue unlocked. */ req = get_request(q, bio_data_dir(bio), rw_flags, bio, GFP_NOIO); if (IS_ERR(req)) { bio->bi_error = PTR_ERR(req); bio_endio(bio); goto out_unlock; } /* * 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. */ init_request_from_bio(req, bio); if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) req->cpu = raw_smp_processor_id(); plug = current->plug; if (plug) { /* * If this is the first request added after a plug, fire * of a plug trace. */ if (!request_count) trace_block_plug(q); else { if (request_count >= BLK_MAX_REQUEST_COUNT) { blk_flush_plug_list(plug, false); trace_block_plug(q); } } list_add_tail(&req->queuelist, &plug->list); blk_account_io_start(req, true); } else { spin_lock_irq(q->queue_lock); add_acct_request(q, req, where); __blk_run_queue(q); out_unlock: spin_unlock_irq(q->queue_lock); } return BLK_QC_T_NONE; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe29960.40%1937.25%
tejun heotejun heo5110.30%611.76%
li shaohuali shaohua306.06%47.84%
christoph hellwigchristoph hellwig204.04%23.92%
darrick j. wongdarrick j. wong193.84%11.96%
linus torvaldslinus torvalds142.83%23.92%
jeff moyerjeff moyer132.63%11.96%
michael christiemichael christie81.62%23.92%
kent overstreetkent overstreet71.41%11.96%
jun'ichi nomurajun'ichi nomura71.41%11.96%
pre-gitpre-git61.21%35.88%
joe lawrencejoe lawrence51.01%11.96%
robert elliottrobert elliott51.01%11.96%
ma jianpengma jianpeng30.61%11.96%
al viroal viro20.40%23.92%
jiri slabyjiri slaby20.40%11.96%
shaohua lishaohua li20.40%11.96%
mike snitzermike snitzer10.20%11.96%
divyesh shahdivyesh shah10.20%11.96%
Total495100.00%51100.00%

/* * If bio->bi_dev is a partition, remap the location */
static inline void blk_partition_remap(struct bio *bio) { struct block_device *bdev = bio->bi_bdev; if (bio_sectors(bio) && bdev != bdev->bd_contains) { struct hd_struct *p = bdev->bd_part; bio->bi_iter.bi_sector += p->start_sect; bio->bi_bdev = bdev->bd_contains; trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), bio, bdev->bd_dev, bio->bi_iter.bi_sector - p->start_sect); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7786.52%225.00%
kent overstreetkent overstreet44.49%112.50%
alan d. brunellealan d. brunelle33.37%112.50%
linus torvaldslinus torvalds22.25%112.50%
al viroal viro22.25%225.00%
mike snitzermike snitzer11.12%112.50%
Total89100.00%8100.00%


static void handle_bad_sector(struct bio *bio) { char b[BDEVNAME_SIZE]; printk(KERN_INFO "attempt to access beyond end of device\n"); printk(KERN_INFO "%s: rw=%d, want=%Lu, limit=%Lu\n", bdevname(bio->bi_bdev, b), bio->bi_opf, (unsigned long long)bio_end_sector(bio), (long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9)); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5681.16%440.00%
pre-gitpre-git57.25%220.00%
mike snitzermike snitzer34.35%110.00%
tejun heotejun heo34.35%110.00%
michael christiemichael christie11.45%110.00%
kent overstreetkent overstreet11.45%110.00%
Total69100.00%10100.00%

#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); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe1995.00%266.67%
tejun heotejun heo15.00%133.33%
Total20100.00%3100.00%

__setup("fail_make_request=", setup_fail_make_request);
static bool should_fail_request(struct hd_struct *part, unsigned int bytes) { return part->make_it_fail && should_fail(&fail_make_request, bytes); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe1450.00%360.00%
akinobu mitaakinobu mita1035.71%120.00%
tejun heotejun heo414.29%120.00%
Total28100.00%5100.00%


static int __init fail_make_request_debugfs(void) { struct dentry *dir = fault_create_debugfs_attr("fail_make_request", NULL, &fail_make_request); return PTR_ERR_OR_ZERO(dir); }

Contributors

PersonTokensPropCommitsCommitProp
akinobu mitaakinobu mita1550.00%120.00%
jens axboejens axboe1240.00%240.00%
andrew mortonandrew morton26.67%120.00%
duan jiongduan jiong13.33%120.00%
Total30100.00%5100.00%

late_initcall(fail_make_request_debugfs); #else /* CONFIG_FAIL_MAKE_REQUEST */
static inline bool should_fail_request(struct hd_struct *part, unsigned int bytes) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
akinobu mitaakinobu mita1157.89%250.00%
jens axboejens axboe842.11%250.00%
Total19100.00%4100.00%

#endif /* CONFIG_FAIL_MAKE_REQUEST */ /* * Check whether this bio extends beyond the end of the device. */
static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors) { sector_t maxsector; if (!nr_sectors) return 0; /* Test device or partition size, when known. */ maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9; if (maxsector) { sector_t sector = bio->bi_iter.bi_sector; if (maxsector < nr_sectors || maxsector - nr_sectors < sector) { /* * This may well happen - the kernel calls bread() * without checking the size of the device, e.g., when * mounting a device. */ handle_bad_sector(bio); return 1; } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6478.05%440.00%
pre-gitpre-git78.54%110.00%
linus torvaldslinus torvalds44.88%220.00%
mike snitzermike snitzer33.66%110.00%
akinobu mitaakinobu mita22.44%110.00%
kent overstreetkent overstreet22.44%110.00%
Total82100.00%10100.00%


static noinline_for_stack bool generic_make_request_checks(struct bio *bio) { struct request_queue *q; int nr_sectors = bio_sectors(bio); int err = -EIO; char b[BDEVNAME_SIZE]; struct hd_struct *part; might_sleep(); if (bio_check_eod(bio, nr_sectors)) goto end_io; q = bdev_get_queue(bio->bi_bdev); if (unlikely(!q)) { printk(KERN_ERR "generic_make_request: Trying to access " "nonexistent block-device %s (%Lu)\n", bdevname(bio->bi_bdev, b), (long long) bio->bi_iter.bi_sector); goto end_io; } part = bio->bi_bdev->bd_part; if (should_fail_request(part, bio->bi_iter.bi_size) || should_fail_request(&part_to_disk(part)->part0, bio->bi_iter.bi_size)) goto end_io; /* * If this device has partitions, remap block n * of partition p to block n+start(p) of the disk. */ blk_partition_remap(bio); if (bio_check_eod(bio, nr_sectors)) goto end_io; /* * Filter flush bio's early so that make_request based * drivers without flush support don't have to worry * about them. */ if ((bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) && !test_bit(QUEUE_FLAG_WC, &q->queue_flags)) { bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA); if (!nr_sectors) { err = 0; goto end_io; } } switch (bio_op(bio)) { case REQ_OP_DISCARD: if (!blk_queue_discard(q)) goto not_supported; break; case REQ_OP_SECURE_ERASE: if (!blk_queue_secure_erase(q)) goto not_supported; break; case REQ_OP_WRITE_SAME: if (!bdev_write_same(bio->bi_bdev)) goto not_supported; break; default: break; } /* * 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); if (!blkcg_bio_issue_check(q, bio)) return false; trace_block_bio_queue(q, bio); return true; not_supported: err = -EOPNOTSUPP; end_io: bio->bi_error = err; bio_endio(bio); return false; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe11434.44%926.47%
christoph hellwigchristoph hellwig6820.54%514.71%
tejun heotejun heo6519.64%411.76%
akinobu mitaakinobu mita288.46%25.88%
martin k. petersenmartin k. petersen133.93%12.94%
vivek goyalvivek goyal82.42%25.88%
minchan kimminchan kim72.11%12.94%
michael christiemichael christie61.81%25.88%
pre-gitpre-git61.81%25.88%
kent overstreetkent overstreet61.81%12.94%
adrian hunteradrian hunter41.21%12.94%
david woodhousedavid woodhouse30.91%12.94%
linus torvaldslinus torvalds20.60%25.88%
andrew mortonandrew morton10.30%12.94%
Total331100.00%34100.00%

/** * 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. */
blk_qc_t generic_make_request(struct bio *bio) { struct bio_list bio_list_on_stack; blk_qc_t ret = BLK_QC_T_NONE; if (!generic_make_request_checks(bio)) goto out; /* * 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 */ if (current->bio_list) { bio_list_add(current->bio_list, bio); goto out; } /* 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 * we assign bio_list to a pointer to the bio_list_on_stack, * thus initialising the bio_list of new bios to be * added. ->make_request() may indeed add some more bios * 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 * of the top of the list (no pretending) and so remove it from * bio_list, and call into ->make_request() again. */ BUG_ON(bio->bi_next); bio_list_init(&bio_list_on_stack); current->bio_list = &bio_list_on_stack; do { struct request_queue *q = bdev_get_queue(bio->bi_bdev); if (likely(blk_queue_enter(q, false) == 0)) { ret = q->make_request_fn(q, bio); blk_queue_exit(q); bio = bio_list_pop(current->bio_list); } else { struct bio *bio_next = bio_list_pop(current->bio_list); bio_io_error(bio); bio = bio_next; } } while (bio); current->bio_list = NULL; /* deactivate */ out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6136.09%333.33%
dan williamsdan williams4426.04%111.11%
christoph hellwigchristoph hellwig2816.57%222.22%
akinobu mitaakinobu mita2313.61%111.11%
neil brownneil brown127.10%111.11%
arnaldo carvalho de meloarnaldo carvalho de melo10.59%111.11%
Total169100.00%9100.00%

EXPORT_SYMBOL(generic_make_request); /** * submit_bio - submit a bio to the block device layer for I/O * @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 * interfaces; @bio must be presetup and ready for I/O. * */
blk_qc_t submit_bio(struct bio *bio) { /* * If it's a regular read/write or a barrier with data attached, * go through the normal accounting stuff before submission. */ if (bio_has_data(bio)) { unsigned int count; if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) count = bdev_logical_block_size(bio->bi_bdev) >> 9; else count = bio_sectors(bio); if (op_is_write(bio_op(bio))) { count_vm_events(PGPGOUT, count); } else { task_io_account_read(bio->bi_iter.bi_size); count_vm_events(PGPGIN, count); } if (unlikely(block_dump)) { char b[BDEVNAME_SIZE]; printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors)\n", current->comm, task_pid_nr(current), op_is_write(bio_op(bio)) ? "WRITE" : "READ", (unsigned long long)bio->bi_iter.bi_sector, bdevname(bio->bi_bdev, b), count); } } return generic_make_request(bio); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7646.63%425.00%
martin k. petersenmartin k. petersen2817.18%16.25%
michael christiemichael christie2012.27%318.75%
andrew mortonandrew morton1710.43%318.75%
linus torvaldslinus torvalds127.36%16.25%
kent overstreetkent overstreet42.45%16.25%
san mehatsan mehat31.84%16.25%
pavel emelianovpavel emelianov21.23%16.25%
pre-gitpre-git10.61%16.25%
Total163100.00%16100.00%

EXPORT_SYMBOL(submit_bio); /** * blk_cloned_rq_check_limits - Helper function to check a cloned request * for new the queue limits * @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. * * Request stacking drivers like request-based dm may change the queue * limits when retrying requests on other queues. Those requests need * to be checked against the new queue limits again during dispatch. */
static int blk_cloned_rq_check_limits(struct request_queue *q, struct request *rq) { if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, req_op(rq))) { printk(KERN_ERR "%s: over max size limit.\n", __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); if (rq->nr_phys_segments > queue_max_segments(q)) { printk(KERN_ERR "%s: over max segments limit.\n", __func__); return -EIO; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
kiyoshi uedakiyoshi ueda6681.48%112.50%
martin k. petersenmartin k. petersen67.41%337.50%
tejun heotejun heo44.94%225.00%
michael christiemichael christie33.70%112.50%
hannes reineckehannes reinecke22.47%112.50%
Total81100.00%8100.00%

/** * blk_insert_cloned_request - Helper for stacking drivers to submit a request * @q: the queue to submit the request * @rq: the request being queued */
int blk_insert_cloned_request(struct request_queue *q, struct request *rq) { unsigned long flags; int where = ELEVATOR_INSERT_BACK; if (blk_cloned_rq_check_limits(q, rq)) return -EIO; if (rq->rq_disk && should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) return -EIO; if (q->mq_ops) { if (blk_queue_io_stat(q)) blk_account_io_start(rq, true); blk_mq_insert_request(rq, false, true, false); return 0; } spin_lock_irqsave(q->queue_lock, flags); if (unlikely(blk_queue_dying(q))) { spin_unlock_irqrestore(q->queue_lock, flags); return -ENODEV; } /* * Submitting request must be dequeued before calling this function * because it will be linked to another request_queue */ BUG_ON(blk_queued_rq(rq)); if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA)) where = ELEVATOR_INSERT_FLUSH; add_acct_request(q, rq, where); if (where == ELEVATOR_INSERT_FLUSH) __blk_run_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
kiyoshi uedakiyoshi ueda9047.62%19.09%
keith buschkeith busch3518.52%19.09%
jeff moyerjeff moyer3216.93%218.18%
tejun heotejun heo2412.70%19.09%
akinobu mitaakinobu mita31.59%19.09%
mike snitzermike snitzer10.53%19.09%
bart van asschebart van assche10.53%19.09%
hannes reineckehannes reinecke10.53%19.09%
jens axboejens axboe10.53%19.09%
michael christiemichael christie10.53%19.09%
Total189100.00%11100.00%

EXPORT_SYMBOL_GPL(blk_insert_cloned_request); /** * blk_rq_err_bytes - determine number of bytes till the next failure boundary * @rq: request to examine * * Description: * A request could be merge of IOs which require different failure * handling. This function determines the number of bytes which * can be failed from the beginning of the request without * crossing into area which need to be retried further. * * Return: * The number of bytes to fail. * * Context: * queue_lock must be held. */
unsigned int blk_rq_err_bytes(const struct request *rq) { unsigned int ff = rq->cmd_flags & REQ_FAILFAST_MASK; unsigned int bytes = 0; struct bio *bio; if (!(rq->cmd_flags & REQ_MIXED_MERGE)) return blk_rq_bytes(rq); /* * Currently the only 'mixing' which can happen is between * different fastfail types. We can safely fail portions * which have all the failfast bits that the first one has - * the ones which are at least as eager to fail as the first * one. */ for (bio = rq->bio; bio; bio = bio->bi_next) { if ((bio->bi_opf & ff) != ff) break; bytes += bio->bi_iter.bi_size; } /* this could lead to infinite loop */ BUG_ON(blk_rq_bytes(rq) && !bytes); return bytes; }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo10297.14%133.33%
kent overstreetkent overstreet21.90%133.33%
jens axboejens axboe10.95%133.33%
Total105100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_rq_err_bytes);
void blk_account_io_completion(struct request *req, unsigned int bytes) { if (blk_do_io_stat(req)) { const int rw = rq_data_dir(req); struct hd_struct *part; int cpu; cpu = part_stat_lock(); part = req->part; part_stat_add(cpu, part, sectors[rw], bytes >> 9); part_stat_unlock(); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6897.14%250.00%
jerome marchandjerome marchand22.86%250.00%
Total70100.00%4100.00%


void blk_account_io_done(struct request *req) { /* * Account IO completion. flush_rq isn't accounted as a * normal IO on queueing nor completion. Accounting the * containing request is enough. */ if (blk_do_io_stat(req) && !(req->cmd_flags & REQ_FLUSH_SEQ)) { unsigned long duration = jiffies - req->start_time; const int rw = rq_data_dir(req); struct hd_struct *part; int cpu; cpu = part_stat_lock(); part = req->part; part_stat_inc(cpu, part, ios[rw]); part_stat_add(cpu, part, ticks[rw], duration); part_round_stats(cpu, part); part_dec_in_flight(part, rw); hd_struct_put(part); part_stat_unlock(); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe9986.09%337.50%
tejun heotejun heo76.09%225.00%
jerome marchandjerome marchand76.09%225.00%
nikanth karthikesannikanth karthikesan21.74%112.50%
Total115100.00%8100.00%

#ifdef CONFIG_PM /* * Don't process normal requests when queue is suspended * or in the process of suspending/resuming */
static struct request *blk_pm_peek_request(struct request_queue *q, struct request *rq) { if (q->dev && (q->rpm_status == RPM_SUSPENDED || (q->rpm_status != RPM_ACTIVE && !(rq->cmd_flags & REQ_PM)))) return NULL; else return rq; }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming56100.00%1100.00%
Total56100.00%1100.00%

#else
static inline struct request *blk_pm_peek_request(struct request_queue *q, struct request *rq) { return rq; }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming22100.00%1100.00%
Total22100.00%1100.00%

#endif
void blk_account_io_start(struct request *rq, bool new_io) { struct hd_struct *part; int rw = rq_data_dir(rq); int cpu; if (!blk_do_io_stat(rq)) return; cpu = part_stat_lock(); if (!new_io) { part = rq->part; part_stat_inc(cpu, part, merges[rw]); } else { part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq)); if (!hd_struct_try_get(part)) { /* * The partition is already being removed, * the request will be accounted on the disk only * * We take a reference on disk->part0 although that * partition will never be deleted, so we can treat * it as any other partition. */ part = &rq->rq_disk->part0; hd_struct_get(part); } part_round_stats(cpu, part); part_inc_in_flight(part, rw); rq->part = part; } part_stat_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe133100.00%1100.00%
Total133100.00%1100.00%

/** * blk_peek_request - peek at the top of a request queue * @q: request queue to peek at * * Description: * Return the request at the top of @q. The returned request * should be started using blk_start_request() before LLD starts * processing it. * * Return: * Pointer to the request at the top of @q if available. Null * otherwise. * * Context: * queue_lock must be held. */
struct request *blk_peek_request(struct request_queue *q) { struct request *rq; int ret; while ((rq = __elv_next_request(q)) != NULL) { rq = blk_pm_peek_request(q, rq); if (!rq) break; if (!(rq->cmd_flags & REQ_STARTED)) { /* * This is the first time the device driver * sees this request (possibly after * requeueing). Notify IO scheduler. */ if (rq->cmd_flags & REQ_SORTED) elv_activate_rq(q, rq); /* * just mark as started even if we don't start * it, a request that has been delayed should * not be passed by new incoming requests */ rq->cmd_flags |= REQ_STARTED; trace_block_rq_issue(q, rq); } if (!q->boundary_rq || q->boundary_rq == rq) { q->end_sector = rq_end_sector(rq); q->boundary_rq = NULL; } if (rq->cmd_flags & REQ_DONTPREP) break; if (q->dma_drain_size && blk_rq_bytes(rq)) { /* * make sure space for the drain appears we * know we can do this because max_hw_segments * has been adjusted to be one fewer than the * device can handle */ rq->nr_phys_segments++; } if (!q->prep_rq_fn) break; ret = q->prep_rq_fn(q, rq); if (ret == BLKPREP_OK) { break; } else if (ret == BLKPREP_DEFER) { /* * the request may have been (partially) prepped. * we need to keep this request in the front to * avoid resource deadlock. REQ_STARTED will * prevent other fs requests from passing this one. */ if (q->dma_drain_size && blk_rq_bytes(rq) && !(rq->cmd_flags & REQ_DONTPREP)) { /* * remove the space for the drain we added * so that we don't add it again */ --rq->nr_phys_segments; } rq = NULL; break; } else if (ret == BLKPREP_KILL || ret == BLKPREP_INVALID) { int err = (ret == BLKPREP_INVALID) ? -EREMOTEIO : -EIO; rq->cmd_flags |= REQ_QUIET; /* * Mark this request as started so we don't trigger * any debug logic in the end I/O path. */ blk_start_request(rq); __blk_end_request_all(rq, err); } else { printk(KERN_ERR "%s: bad return=%d\n", __func__, ret); break; } } return rq; }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo21876.22%535.71%
martin k. petersenmartin k. petersen206.99%17.14%
lin minglin ming155.24%17.14%
jens axboejens axboe124.20%321.43%
pre-gitpre-git93.15%17.14%
james bottomleyjames bottomley62.10%17.14%
christoph hellwigchristoph hellwig41.40%17.14%
linus torvaldslinus torvalds20.70%17.14%
Total286100.00%14100.00%

EXPORT_SYMBOL(blk_peek_request);
void blk_dequeue_request(struct request *rq) { struct request_queue *q = rq->q; BUG_ON(list_empty(&rq->queuelist)); BUG_ON(ELV_ON_HASH(rq)); list_del_init(&rq->queuelist); /* * the time frame between a request being removed from the lists * and to it is freed is accounted as io that is in progress at * the driver side. */ if (blk_account_rq(rq)) { q->in_flight[rq_is_sync(rq)]++; set_io_start_time_ns(rq); } }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo5981.94%250.00%
divyesh shahdivyesh shah79.72%125.00%
jens axboejens axboe68.33%125.00%
Total72100.00%4100.00%

/** * blk_start_request - start request processing on the driver * @req: request to dequeue * * Description: * Dequeue @req and start timeout timer on it. This hands off the * request to the driver. * * Block internal functions which don't want to start timer should * call blk_dequeue_request(). * * Context: * queue_lock must be held. */
void blk_start_request(struct request *req) { blk_dequeue_request(req); /* * We are now handing the request to the hardware, initialize * resid_len to full count and add the timeout handler. */ req->resid_len = blk_rq_bytes(req); if (unlikely(blk_bidi_rq(req))) req->next_rq->resid_len = blk_rq_bytes(req->next_rq); BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); blk_add_timer(req); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo3045.45%250.00%
fujita tomonorifujita tomonori2334.85%125.00%
jeff moyerjeff moyer1319.70%125.00%
Total66100.00%4100.00%

EXPORT_SYMBOL(blk_start_request); /** * blk_fetch_request - fetch a request from a request queue * @q: request queue to fetch a request from * * Description: * Return the request at the top of @q. The request is started on * return and LLD can start processing it immediately. * * Return: * Pointer to the request at the top of @q if available. Null * otherwise. * * Context: * queue_lock must be held. */
struct request *blk_fetch_request(struct request_queue *q) { struct request *rq; rq = blk_peek_request(q); if (rq) blk_start_request(rq); return rq; }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo36100.00%1100.00%
Total36100.00%1100.00%

EXPORT_SYMBOL(blk_fetch_request); /** * blk_update_request - Special helper function for request stacking drivers * @req: the request being processed * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @req * * Description: * 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. * * 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. * * Return: * %false - this request doesn't have any more data * %true - this request has more data **/
bool blk_update_request(struct request *req, int error, unsigned int nr_bytes) { int total_bytes; trace_block_rq_complete(req->q, req, nr_bytes); if (!req->bio) return false; /* * For fs requests, rq is just carrier of independent bio's * and each partial completion should be handled separately. * Reset per-request error on each partial completion. * * TODO: tj: This is too subtle. It would be better to let * low level drivers do what they see fit. */ if (req->cmd_type == REQ_TYPE_FS) req->errors = 0; if (error && req->cmd_type == REQ_TYPE_FS && !(req->cmd_flags & REQ_QUIET)) { char *error_type; switch (error) { case -ENOLINK: error_type = "recoverable transport"; break; case -EREMOTEIO: error_type = "critical target"; break; case -EBADE: error_type = "critical nexus"; break; case -ETIMEDOUT: error_type = "timeout"; break; case -ENOSPC: error_type = "critical space allocation"; break; case -ENODATA: error_type = "critical medium"; break; case -EIO: default: error_type = "I/O"; break; } printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu\n", __func__, error_type, req->rq_disk ? req->rq_disk->disk_name : "?", (unsigned long long)blk_rq_pos(req)); } blk_account_io_completion(req, nr_bytes); total_bytes = 0; while (req->bio) { struct bio *bio = req->bio; unsigned bio_bytes = min(bio->bi_iter.bi_size, nr_bytes); if (bio_bytes == bio->bi_iter.bi_size) req->bio = bio->bi_next; req_bio_endio(req, bio, bio_bytes, error); total_bytes += bio_bytes; nr_bytes -= bio_bytes; if (!nr_bytes) break; } /* * completely done */ if (!req->bio) { /* * Reset counters so that the request stacking driver * can find how many bytes remain in the request * later. */ req->__data_len = 0; return false; } req->__data_len -= total_bytes; /* update sector only for requests with clear definition of sector */ if (req->cmd_type == REQ_TYPE_FS) req->__sector += total_bytes >> 9; /* mixed attributes always follow the first bio */ if (req->cmd_flags & REQ_MIXED_MERGE) { req->cmd_flags &= ~REQ_FAILFAST_MASK; req->cmd_flags |= req->bio->bi_opf & REQ_FAILFAST_MASK; } /* * 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); } /* recalculate the number of segments */ blk_recalc_rq_segments(req); return true; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe13234.65%1232.43%
tejun heotejun heo9224.15%821.62%
hannes reineckehannes reinecke8622.57%513.51%
kent overstreetkent overstreet307.87%25.41%
pre-gitpre-git153.94%12.70%
christoph hellwigchristoph hellwig123.15%12.70%
linus torvaldslinus torvalds30.79%12.70%
robert elliottrobert elliott30.79%12.70%
andrew mortonandrew morton20.52%12.70%
kiyoshi uedakiyoshi ueda20.52%25.41%
roman peniaevroman peniaev20.52%12.70%
arnaldo carvalho de meloarnaldo carvalho de melo10.26%12.70%
yi zouyi zou10.26%12.70%
Total381100.00%37100.00%

EXPORT_SYMBOL_GPL(blk_update_request);
static bool blk_update_bidi_request(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes) { if (blk_update_request(rq, error, nr_bytes)) return true; /* Bidi request must be completed as a whole */ if (unlikely(blk_bidi_rq(rq)) && blk_update_request(rq->next_rq, error, bidi_bytes)) return true; if (blk_queue_add_random(rq->q)) add_disk_randomness(rq->rq_disk); return false; }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo6682.50%233.33%
jens axboejens axboe1417.50%466.67%
Total80100.00%6100.00%

/** * blk_unprep_request - unprepare a request * @req: the request * * This function makes a request ready for complete resubmission (or * completion). It happens only after all error handling is complete, * so represents the appropriate moment to deallocate any resources * that were allocated to the request in the prep_rq_fn. The queue * lock is held when calling this. */
void blk_unprep_request(struct request *req) { struct request_queue *q = req->q; req->cmd_flags &= ~REQ_DONTPREP; if (q->unprep_rq_fn) q->unprep_rq_fn(q, req); }

Contributors

PersonTokensPropCommitsCommitProp
james bottomleyjames bottomley41100.00%1100.00%
Total41100.00%1100.00%

EXPORT_SYMBOL_GPL(blk_unprep_request); /* * queue lock must be held */
void blk_finish_request(struct request *req, int error) { if (req->cmd_flags & REQ_QUEUED) blk_queue_end_tag(req->q, req); BUG_ON(blk_queued_rq(req)); if (unlikely(laptop_mode) && req->cmd_type == REQ_TYPE_FS) laptop_io_completion(&req->q->backing_dev_info); blk_delete_timer(req); if (req->cmd_flags & REQ_DONTPREP) blk_unprep_request(req); blk_account_io_done(req); if (req->end_io) req->end_io(req, error); else { if (blk_bidi_rq(req)) __blk_put_request(req->next_rq->q, req->next_rq); __blk_put_request(req->q, req); } }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe8061.07%426.67%
james bottomleyjames bottomley1511.45%213.33%
kiyoshi uedakiyoshi ueda107.63%213.33%
matthew garrettmatthew garrett86.11%16.67%
christoph hellwigchristoph hellwig86.11%213.33%
mike andersonmike anderson53.82%16.67%
arnaldo carvalho de meloarnaldo carvalho de melo32.29%16.67%
tejun heotejun heo21.53%213.33%
Total131100.00%15100.00%

EXPORT_SYMBOL(blk_finish_request); /** * blk_end_bidi_request - Complete a bidi request * @rq: the request to complete * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq * * Description: * Ends I/O on a number of bytes attached to @rq and @rq->next_rq. * Drivers that supports bidi can safely call this member for any * type of request, bidi or uni. In the later case @bidi_bytes is * just ignored. * * Return: * %false - we are done with this request * %true - still buffers pending for this request **/
static bool blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes) { struct request_queue *q = rq->q; unsigned long flags; if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; spin_lock_irqsave(q->queue_lock, flags); blk_finish_request(rq, error); spin_unlock_irqrestore(q->queue_lock, flags); return false; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6177.22%555.56%
andrew mortonandrew morton1113.92%222.22%
tejun heotejun heo67.59%111.11%
fujita tomonorifujita tomonori11.27%111.11%
Total79100.00%9100.00%

/** * __blk_end_bidi_request - Complete a bidi request with queue lock held * @rq: the request to complete * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq * * Description: * Identical to blk_end_bidi_request() except that queue lock is * assumed to be locked on entry and remains so on return. * * Return: * %false - we are done with this request * %true - still buffers pending for this request **/
bool __blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes) { if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes)) return true; blk_finish_request(rq, error); return false; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2246.81%228.57%
kiyoshi uedakiyoshi ueda1225.53%228.57%
tejun heotejun heo1123.40%228.57%
andrew mortonandrew morton24.26%114.29%
Total47100.00%7100.00%

/** * blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * * Description: * Ends I/O on a number of bytes attached to @rq. * If @rq has leftover, sets it up for the next range of segments. * * Return: * %false - we are done with this request * %true - still buffers pending for this request **/
bool blk_end_request(struct request *rq, int error, unsigned int nr_bytes) { return blk_end_bidi_request(rq, error, nr_bytes, 0); }

Contributors

PersonTokensPropCommitsCommitProp
fujita tomonorifujita tomonori29100.00%1100.00%
Total29100.00%1100.00%

EXPORT_SYMBOL(blk_end_request); /** * blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish * @error: %0 for success, < %0 for error * * Description: * Completely finish @rq. */
void blk_end_request_all(struct request *rq, int error) { bool pending; unsigned int bidi_bytes = 0; if (unlikely(blk_bidi_rq(rq))) bidi_bytes = blk_rq_bytes(rq->next_rq); pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); BUG_ON(pending); }

Contributors

PersonTokensPropCommitsCommitProp
fujita tomonorifujita tomonori5893.55%133.33%
jens axboejens axboe23.23%133.33%
kiyoshi uedakiyoshi ueda23.23%133.33%
Total62100.00%3100.00%

EXPORT_SYMBOL(blk_end_request_all); /** * blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for * @error: %0 for success, < %0 for error * * Description: * Complete the current consecutively mapped chunk from @rq. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */
bool blk_end_request_cur(struct request *rq, int error) { return blk_end_request(rq, error, blk_rq_cur_bytes(rq)); }

Contributors

PersonTokensPropCommitsCommitProp
fujita tomonorifujita tomonori2180.77%133.33%
jens axboejens axboe415.38%133.33%
kiyoshi uedakiyoshi ueda13.85%133.33%
Total26100.00%3100.00%

EXPORT_SYMBOL(blk_end_request_cur); /** * blk_end_request_err - Finish a request till the next failure boundary. * @rq: the request to finish till the next failure boundary for * @error: must be negative errno * * Description: * Complete @rq till the next failure boundary. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */
bool blk_end_request_err(struct request *rq, int error) { WARN_ON(error >= 0); return blk_end_request(rq, error, blk_rq_err_bytes(rq)); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo33100.00%1100.00%
Total33100.00%1100.00%

EXPORT_SYMBOL_GPL(blk_end_request_err); /** * __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * * Description: * Must be called with queue lock held unlike blk_end_request(). * * Return: * %false - we are done with this request * %true - still buffers pending for this request **/
bool __blk_end_request(struct request *rq, int error, unsigned int nr_bytes) { return __blk_end_bidi_request(rq, error, nr_bytes, 0); }

Contributors

PersonTokensPropCommitsCommitProp
fujita tomonorifujita tomonori1758.62%120.00%
jens axboejens axboe724.14%120.00%
pre-gitpre-git310.34%240.00%
andrew mortonandrew morton26.90%120.00%
Total29100.00%5100.00%

EXPORT_SYMBOL(__blk_end_request); /** * __blk_end_request_all - Helper function for drives to finish the request. * @rq: the request to finish * @error: %0 for success, < %0 for error * * Description: * Completely finish @rq. Must be called with queue lock held. */
void __blk_end_request_all(struct request *rq, int error) { bool pending; unsigned int bidi_bytes = 0; if (unlikely(blk_bidi_rq(rq))) bidi_bytes = blk_rq_bytes(rq->next_rq); pending = __blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes); BUG_ON(pending); }

Contributors

PersonTokensPropCommitsCommitProp
fujita tomonorifujita tomonori3658.06%116.67%
jens axboejens axboe1524.19%233.33%
kiyoshi uedakiyoshi ueda914.52%116.67%
tejun heotejun heo11.61%116.67%
pre-gitpre-git11.61%116.67%
Total62100.00%6100.00%

EXPORT_SYMBOL(__blk_end_request_all); /** * __blk_end_request_cur - Helper function to finish the current request chunk. * @rq: the request to finish the current chunk for * @error: %0 for success, < %0 for error * * Description: * Complete the current consecutively mapped chunk from @rq. Must * be called with queue lock held. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */
bool __blk_end_request_cur(struct request *rq, int error) { return __blk_end_request(rq, error, blk_rq_cur_bytes(rq)); }

Contributors

PersonTokensPropCommitsCommitProp
kiyoshi uedakiyoshi ueda2180.77%150.00%
fujita tomonorifujita tomonori519.23%150.00%
Total26100.00%2100.00%

EXPORT_SYMBOL(__blk_end_request_cur); /** * __blk_end_request_err - Finish a request till the next failure boundary. * @rq: the request to finish till the next failure boundary for * @error: must be negative errno * * Description: * Complete @rq till the next failure boundary. Must be called * with queue lock held. * * Return: * %false - we are done with this request * %true - still buffers pending for this request */
bool __blk_end_request_err(struct request *rq, int error) { WARN_ON(error >= 0); return __blk_end_request(rq, error, blk_rq_err_bytes(rq)); }

Contributors

PersonTokensPropCommitsCommitProp
tejun heotejun heo33100.00%1100.00%
Total33100.00%1100.00%

EXPORT_SYMBOL_GPL(__blk_end_request_err);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) { req_set_op(rq, bio_op(bio)); if (bio_has_data(bio)) rq->nr_phys_segments = bio_phys_segments(q, bio); rq->__data_len = bio->bi_iter.bi_size; rq->bio = rq->biotail = bio; if (bio->bi_bdev) rq->rq_disk = bio->bi_bdev->bd_disk; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5565.48%327.27%
andrew mortonandrew morton1517.86%218.18%
michael christiemichael christie78.33%19.09%
david woodhousedavid woodhouse22.38%19.09%
kent overstreetkent overstreet22.38%19.09%
greg kroah-hartmangreg kroah-hartman11.19%19.09%
al viroal viro11.19%19.09%
tejun heotejun heo11.19%19.09%
Total84100.00%11100.00%

#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; struct bio_vec bvec; rq_for_each_segment(bvec, rq, iter) flush_dcache_page(bvec.bv_page); }

Contributors

PersonTokensPropCommitsCommitProp
ilya loginovilya loginov3296.97%150.00%
kent overstreetkent overstreet13.03%150.00%
Total33100.00%2100.00%

EXPORT_SYMBOL_GPL(rq_flush_dcache_pages); #endif /** * 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; }

Contributors

PersonTokensPropCommitsCommitProp
kiyoshi uedakiyoshi ueda1659.26%133.33%
jens axboejens axboe1140.74%266.67%
Total27100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_lld_busy); /** * 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); } }

Contributors

PersonTokensPropCommitsCommitProp
mike snitzermike snitzer4197.62%150.00%
kiyoshi uedakiyoshi ueda12.38%150.00%
Total42100.00%2100.00%

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) { dst->cpu = src->cpu; req_set_op_attrs(dst, req_op(src), (src->cmd_flags & REQ_CLONE_MASK) | REQ_NOMERGE); dst->cmd_type = src->cmd_type; dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); dst->nr_phys_segments = src->nr_phys_segments; dst->ioprio = src->ioprio; dst->extra_len = src->extra_len; }

Contributors

PersonTokensPropCommitsCommitProp
kiyoshi uedakiyoshi ueda6265.96%222.22%
mike snitzermike snitzer1010.64%222.22%
michael christiemichael christie99.57%111.11%
jens axboejens axboe77.45%111.11%
al viroal viro33.19%111.11%
tejun heotejun heo22.13%111.11%
christoph hellwigchristoph hellwig11.06%111.11%
Total94100.00%9100.00%

/** * blk_rq_prep_clone - Helper function to setup clone request * @rq: the request to be setup * @rq_src: original request to be cloned * @bs: bio_set that bios for clone are allocated from * @gfp_mask: memory allocation mask for bio * @bio_ctr: setup function to be called for each clone bio. * Returns %0 for success, non %0 for failure. * @data: private data to be passed to @bio_ctr * * Description: * Clones bios in @rq_src to @rq, and copies attributes of @rq_src to @rq. * The actual data parts of @rq_src (e.g. ->cmd, ->sense) * are not copied, and copying such parts is the caller's responsibility. * Also, pages which the original bios are pointing to are not copied * and the cloned bios just point same pages. * So cloned bios must be completed before original bios, which means * the caller must complete @rq before @rq_src. */
int blk_rq_prep_clone(struct request *rq, struct request *rq_src, struct bio_set *bs, gfp_t gfp_mask, int (*bio_ctr)(struct bio *, struct bio *, void *), void *data) { struct bio *bio, *bio_src; if (!bs) bs = fs_bio_set; __rq_for_each_bio(bio_src, rq_src) { bio = bio_clone_fast(bio_src, gfp_mask, bs); if (!bio) goto free_and_out; if (bio_ctr && bio_ctr(bio, bio_src, data)) goto free_and_out; if (rq->bio) { rq->biotail->bi_next = bio; rq->biotail = bio; } else rq->bio = rq->biotail = bio; } __blk_rq_prep_clone(rq, rq_src); return 0; free_and_out: if (bio) bio_put(bio); blk_rq_unprep_clone(rq); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
mike snitzermike snitzer15089.29%111.11%
jens axboejens axboe148.33%444.44%
david woodhousedavid woodhouse10.60%111.11%
kiyoshi uedakiyoshi ueda10.60%111.11%
andrew mortonandrew morton10.60%111.11%
al viroal viro10.60%111.11%
Total168100.00%9100.00%

EXPORT_SYMBOL_GPL(blk_rq_prep_clone);
int kblockd_schedule_work(struct work_struct *work) { return queue_work(kblockd_workqueue, work); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe1161.11%150.00%
ilya loginovilya loginov738.89%150.00%
Total18100.00%2100.00%

EXPORT_SYMBOL(kblockd_schedule_work);
int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay) { return queue_delayed_work(kblockd_workqueue, dwork, delay); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe24100.00%3100.00%
Total24100.00%3100.00%

EXPORT_SYMBOL(kblockd_schedule_delayed_work);
int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay) { return queue_delayed_work_on(cpu, kblockd_workqueue, dwork, delay); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe29100.00%1100.00%
Total29100.00%1100.00%

EXPORT_SYMBOL(kblockd_schedule_delayed_work_on); /** * 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. */
void blk_start_plug(struct blk_plug *plug) { struct task_struct *tsk = current; /* * If this is a nested plug, don't actually assign it. */ if (tsk->plug) return; INIT_LIST_HEAD(&plug->list); INIT_LIST_HEAD(&plug->mq_list); INIT_LIST_HEAD(&plug->cb_list); /* * Store ordering should not be needed here, since a potential * preempt will imply a full memory barrier */ tsk->plug = plug; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe3053.57%555.56%
shaohua lishaohua li916.07%111.11%
neil brownneil brown814.29%111.11%
kiyoshi uedakiyoshi ueda610.71%111.11%
andrew mortonandrew morton35.36%111.11%
Total56100.00%9100.00%

EXPORT_SYMBOL(blk_start_plug);
static int plug_rq_cmp(void *priv, struct list_head *a, struct list_head *b) { struct request *rqa = container_of(a, struct request, queuelist); struct request *rqb = container_of(b, struct request, queuelist); return !(rqa->q < rqb->q || (rqa->q == rqb->q && blk_rq_pos(rqa) < blk_rq_pos(rqb))); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5162.20%233.33%
ma jianpengma jianpeng2125.61%116.67%
kiyoshi uedakiyoshi ueda89.76%233.33%
al viroal viro22.44%116.67%
Total82100.00%6100.00%

/* * If 'from_schedule' is true, then postpone the dispatch of requests * until a safe kblockd context. We due this to avoid accidental big * additional stack usage in driver dispatch, in places where the originally * plugger did not intend it. */
static void queue_unplugged(struct request_queue *q, unsigned int depth, bool from_schedule) __releases(q->queue_lock) { trace_block_unplug(q, depth, !from_schedule); if (from_schedule) blk_run_queue_async(q); else __blk_run_queue(q); spin_unlock(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe5598.21%480.00%
christoph hellwigchristoph hellwig11.79%120.00%
Total56100.00%5100.00%


static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) { LIST_HEAD(callbacks); while (!list_empty(&plug->cb_list)) { list_splice_init(&plug->cb_list, &callbacks); while (!list_empty(&callbacks)) { struct blk_plug_cb *cb = list_first_entry(&callbacks, struct blk_plug_cb, list); list_del(&cb->list); cb->callback(cb, from_schedule); } } }

Contributors

PersonTokensPropCommitsCommitProp
neil brownneil brown8395.40%266.67%
shaohua lishaohua li44.60%133.33%
Total87100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
neil brownneil brown119100.00%1100.00%
Total119100.00%1100.00%

EXPORT_SYMBOL(blk_check_plugged);
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) { struct request_queue *q; unsigned long flags; struct request *rq; LIST_HEAD(list); unsigned int depth; flush_plug_callbacks(plug, from_schedule); if (!list_empty(&plug->mq_list)) blk_mq_flush_plug_list(plug, from_schedule); if (list_empty(&plug->list)) return; list_splice_init(&plug->list, &list); list_sort(NULL, &list, plug_rq_cmp); q = NULL; depth = 0; /* * Save and disable interrupts here, to avoid doing it for every * queue lock we have to take. */ local_irq_save(flags); while (!list_empty(&list)) { rq = list_entry_rq(list.next); list_del_init(&rq->queuelist); BUG_ON(!rq->q); if (rq->q != q) { /* * This drops the queue lock */ if (q) queue_unplugged(q, depth, from_schedule); q = rq->q; depth = 0; spin_lock(q->queue_lock); } /* * Short-circuit if @q is dead */ if (unlikely(blk_queue_dying(q))) { __blk_end_request_all(rq, -ENODEV); continue; } /* * rq is already accounted, so use raw insert */ if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA)) __elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH); else __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE); depth++; } /* * This drops the queue lock */ if (q) queue_unplugged(q, depth, from_schedule); local_irq_restore(flags); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe16362.69%1252.17%
kiyoshi uedakiyoshi ueda3714.23%14.35%
neil brownneil brown238.85%313.04%
tejun heotejun heo218.08%14.35%
andrew mortonandrew morton62.31%14.35%
al viroal viro41.54%14.35%
david woodhousedavid woodhouse31.15%14.35%
bart van asschebart van assche10.38%14.35%
michael christiemichael christie10.38%14.35%
christoph hellwigchristoph hellwig10.38%14.35%
Total260100.00%23100.00%


void blk_finish_plug(struct blk_plug *plug) { if (plug != current->plug) return; blk_flush_plug_list(plug, false); current->plug = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe2062.50%360.00%
shaohua lishaohua li928.12%120.00%
christoph hellwigchristoph hellwig39.38%120.00%
Total32100.00%5100.00%

EXPORT_SYMBOL(blk_finish_plug);
bool blk_poll(struct request_queue *q, blk_qc_t cookie) { struct blk_plug *plug; long state; if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) || !test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return false; plug = current->plug; if (plug) blk_flush_plug_list(plug, false); state = current->state; while (!need_resched()) { unsigned int queue_num = blk_qc_t_to_queue_num(cookie); struct blk_mq_hw_ctx *hctx = q->queue_hw_ctx[queue_num]; int ret; hctx->poll_invoked++; ret = q->mq_ops->poll(hctx, blk_qc_t_to_tag(cookie)); if (ret > 0) { hctx->poll_success++; set_current_state(TASK_RUNNING); return true; } if (signal_pending_state(state, current)) set_current_state(TASK_RUNNING); if (current->state == TASK_RUNNING) return true; if (ret < 0) break; cpu_relax(); } return false; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe190100.00%1100.00%
Total190100.00%1100.00%

EXPORT_SYMBOL_GPL(blk_poll); #ifdef CONFIG_PM /** * blk_pm_runtime_init - Block layer runtime PM initialization routine * @q: the queue of the device * @dev: the device the queue belongs to * * Description: * Initialize runtime-PM-related fields for @q and start auto suspend for * @dev. Drivers that want to take advantage of request-based runtime PM * should call this function after @dev has been initialized, and its * request queue @q has been allocated, and runtime PM for it can not happen * yet(either due to disabled/forbidden or its usage_count > 0). In most * cases, driver should call this function before any I/O has taken place. * * This function takes care of setting up using auto suspend for the device, * the autosuspend delay is set to -1 to make runtime suspend impossible * until an updated value is either set by user or by driver. Drivers do * not need to touch other autosuspend settings. * * The block layer runtime PM is request based, so only works for drivers * that use request as their IO unit instead of those directly use bio's. */
void blk_pm_runtime_init(struct request_queue *q, struct device *dev) { q->dev = dev; q->rpm_status = RPM_ACTIVE; pm_runtime_set_autosuspend_delay(q->dev, -1); pm_runtime_use_autosuspend(q->dev); }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming44100.00%1100.00%
Total44100.00%1100.00%

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; if (!q->dev) return ret; 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; }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming6185.92%150.00%
ken xueken xue1014.08%150.00%
Total71100.00%2100.00%

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) { if (!q->dev) return; 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); }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming5687.50%150.00%
ken xueken xue812.50%150.00%
Total64100.00%2100.00%

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) { if (!q->dev) return; spin_lock_irq(q->queue_lock); q->rpm_status = RPM_RESUMING; spin_unlock_irq(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming3078.95%150.00%
ken xueken xue821.05%150.00%
Total38100.00%2100.00%

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) { if (!q->dev) return; spin_lock_irq(q->queue_lock); if (!err) { q->rpm_status = RPM_ACTIVE; __blk_run_queue(q); pm_runtime_mark_last_busy(q->dev); pm_request_autosuspend(q->dev); } else { q->rpm_status = RPM_SUSPENDED; } spin_unlock_irq(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
lin minglin ming6788.16%133.33%
ken xueken xue810.53%133.33%
aaron luaaron lu11.32%133.33%
Total76100.00%3100.00%

EXPORT_SYMBOL(blk_post_runtime_resume); /** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
mika westerbergmika westerberg44100.00%1100.00%
Total44100.00%1100.00%

EXPORT_SYMBOL(blk_set_runtime_active); #endif
int __init blk_dev_init(void) { BUILD_BUG_ON(__REQ_NR_BITS > 8 * FIELD_SIZEOF(struct request, cmd_flags)); /* used for unplugging and affects IO latency/throughput - HIGHPRI */ kblockd_workqueue = alloc_workqueue("kblockd", WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); if (!kblockd_workqueue) panic("Failed to create kblockd\n"); request_cachep = kmem_cache_create("blkdev_requests", sizeof(struct request), 0, SLAB_PANIC, NULL); blk_requestq_cachep = kmem_cache_create("request_queue", sizeof(struct request_queue), 0, SLAB_PANIC, NULL); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe6472.73%233.33%
nikanth karthikesannikanth karthikesan1314.77%116.67%
tejun heotejun heo89.09%116.67%
maninder singhmaninder singh22.27%116.67%
ilya dryomovilya dryomov11.14%116.67%
Total88100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe479540.76%10623.04%
tejun heotejun heo224019.04%8117.61%
lin minglin ming4623.93%20.43%
christoph hellwigchristoph hellwig4233.60%204.35%
mike snitzermike snitzer3733.17%122.61%
kiyoshi uedakiyoshi ueda3603.06%102.17%
neil brownneil brown2702.29%81.74%
fujita tomonorifujita tomonori2331.98%61.30%
dan williamsdan williams2281.94%20.43%
andrew mortonandrew morton2181.85%235.00%
bart van asschebart van assche1661.41%71.52%
jeff moyerjeff moyer1511.28%40.87%
pre-gitpre-git1181.00%265.65%
michael christiemichael christie1130.96%102.17%
kent overstreetkent overstreet1030.88%51.09%
james bottomleyjames bottomley1000.85%40.87%
akinobu mitaakinobu mita980.83%40.87%
linus torvaldslinus torvalds960.82%143.04%
hannes reineckehannes reinecke900.76%61.30%
shaohua lishaohua li770.65%51.09%
martin k. petersenmartin k. petersen750.64%61.30%
asias heasias he700.59%20.43%
david rientjesdavid rientjes690.59%10.22%
jerome marchandjerome marchand600.51%40.87%
ilya loginovilya loginov530.45%10.22%
li shaohuali shaohua520.44%51.09%
mika westerbergmika westerberg500.42%10.22%
lei minglei ming450.38%30.65%
keith buschkeith busch400.34%20.43%
mike christiemike christie350.30%30.65%
ken xueken xue340.29%10.22%
joe lawrencejoe lawrence330.28%10.22%
al viroal viro290.25%71.52%
tomoki sekiyamatomoki sekiyama270.23%10.22%
matthew garrettmatthew garrett260.22%10.22%
ming leiming lei250.21%40.87%
ma jianpengma jianpeng240.20%20.43%
divyesh shahdivyesh shah220.19%20.43%
darrick j. wongdarrick j. wong190.16%10.22%
nick pigginnick piggin180.15%30.65%
martin daleckimartin dalecki180.15%20.43%
nikanth karthikesannikanth karthikesan180.15%20.43%
dave jonesdave jones160.14%10.22%
arnaldo carvalho de meloarnaldo carvalho de melo140.12%20.43%
jun'ichi nomurajun'ichi nomura120.10%20.43%
vivek goyalvivek goyal120.10%20.43%
robert elliottrobert elliott110.09%30.65%
mikulas patockamikulas patocka110.09%10.22%
li zefanli zefan110.09%20.43%
keith manntheykeith mannthey110.09%10.22%
boaz harroshboaz harrosh100.08%10.22%
david woodhousedavid woodhouse90.08%10.22%
randy dunlaprandy dunlap80.07%40.87%
peter zijlstrapeter zijlstra70.06%10.22%
minchan kimminchan kim70.06%10.22%
christoph lameterchristoph lameter60.05%20.43%
ming linming lin50.04%10.22%
nathan scottnathan scott50.04%10.22%
mike andersonmike anderson50.04%10.22%
sagi grimbergsagi grimberg50.04%10.22%
adrian hunteradrian hunter40.03%10.22%
stuart mclarenstuart mclaren40.03%10.22%
san mehatsan mehat30.03%10.22%
ingo molnaringo molnar30.03%10.22%
alan d. brunellealan d. brunelle30.03%10.22%
rafael j. wysockirafael j. wysocki30.03%10.22%
mel gormanmel gorman30.03%10.22%
jiri slabyjiri slaby20.02%10.22%
ezequiel garciaezequiel garcia20.02%10.22%
roman peniaevroman peniaev20.02%10.22%
maninder singhmaninder singh20.02%10.22%
masanari iidamasanari iida20.02%10.22%
pavel emelianovpavel emelianov20.02%10.22%
suresh jayaramansuresh jayaraman10.01%10.22%
kirill a. shutemovkirill a. shutemov10.01%10.22%
aaron luaaron lu10.01%10.22%
greg kroah-hartmangreg kroah-hartman10.01%10.22%
duan jiongduan jiong10.01%10.22%
ilya dryomovilya dryomov10.01%10.22%
dan carpenterdan carpenter10.01%10.22%
yi zouyi zou10.01%10.22%
adrian bunkadrian bunk10.01%10.22%
Total11765100.00%460100.00%
Directory: block
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.