cregit-Linux how code gets into the kernel

Release 4.8 block/blk-exec.c

Directory: block
/*
 * Functions related to setting various queue properties from drivers
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/sched/sysctl.h>

#include "blk.h"

/*
 * for max sense size
 */
#include <scsi/scsi_cmnd.h>

/**
 * blk_end_sync_rq - executes a completion event on a request
 * @rq: request to complete
 * @error: end I/O status of the request
 */

static void blk_end_sync_rq(struct request *rq, int error) { struct completion *waiting = rq->end_io_data; rq->end_io_data = NULL; /* * complete last, if this is a stack request the process (and thus * the rq pointer) could be invalid right after this complete() */ complete(waiting); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe3497.14%150.00%
fujita tomonorifujita tomonori12.86%150.00%
Total35100.00%2100.00%

/** * blk_execute_rq_nowait - insert a request into queue for execution * @q: queue to insert the request in * @bd_disk: matching gendisk * @rq: request to insert * @at_head: insert request at head or tail of queue * @done: I/O completion handler * * Description: * Insert a fully prepared request at the back of the I/O scheduler queue * for execution. Don't wait for completion. * * Note: * This function will invoke @done directly if the queue is dead. */
void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head, rq_end_io_fn *done) { int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; WARN_ON(irqs_disabled()); WARN_ON(rq->cmd_type == REQ_TYPE_FS); rq->rq_disk = bd_disk; rq->end_io = done; /* * don't check dying flag for MQ because the request won't * be reused after dying flag is set */ if (q->mq_ops) { blk_mq_insert_request(rq, at_head, true, false); return; } spin_lock_irq(q->queue_lock); if (unlikely(blk_queue_dying(q))) { rq->cmd_flags |= REQ_QUIET; rq->errors = -ENXIO; __blk_end_request_all(rq, rq->errors); spin_unlock_irq(q->queue_lock); return; } __elv_add_request(q, rq, where); __blk_run_queue(q); spin_unlock_irq(q->queue_lock); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe7246.75%323.08%
james bottomleyjames bottomley2516.23%17.69%
muthukumar rattymuthukumar ratty1912.34%17.69%
tejun heotejun heo138.44%17.69%
christoph hellwigchristoph hellwig138.44%323.08%
mike christiemike christie74.55%17.69%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz31.95%17.69%
bart van asschebart van assche21.30%215.38%
Total154100.00%13100.00%

EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); /** * blk_execute_rq - insert a request into queue for execution * @q: queue to insert the request in * @bd_disk: matching gendisk * @rq: request to insert * @at_head: insert request at head or tail of queue * * Description: * Insert a fully prepared request at the back of the I/O scheduler queue * for execution and wait for completion. */
int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head) { DECLARE_COMPLETION_ONSTACK(wait); char sense[SCSI_SENSE_BUFFERSIZE]; int err = 0; unsigned long hang_check; if (!rq->sense) { memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; } rq->end_io_data = &wait; blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq); /* Prevent hang_check timer from firing at us during very long I/O */ hang_check = sysctl_hung_task_timeout_secs; if (hang_check) while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); else wait_for_completion_io(&wait); if (rq->errors) err = -EIO; if (rq->sense == sense) { rq->sense = NULL; rq->sense_len = 0; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe11166.87%125.00%
mark lordmark lord3118.67%125.00%
rickard strandqvistrickard strandqvist2213.25%125.00%
vladimir davydovvladimir davydov21.20%125.00%
Total166100.00%4100.00%

EXPORT_SYMBOL(blk_execute_rq);

Overall Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe25063.45%315.79%
mark lordmark lord317.87%15.26%
james bottomleyjames bottomley256.35%15.26%
rickard strandqvistrickard strandqvist225.58%15.26%
muthukumar rattymuthukumar ratty205.08%15.26%
christoph hellwigchristoph hellwig133.30%315.79%
tejun heotejun heo133.30%15.26%
mike christiemike christie71.78%15.26%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz30.76%15.26%
clark williamsclark williams30.76%15.26%
vladimir davydovvladimir davydov20.51%15.26%
bart van asschebart van assche20.51%210.53%
randy dunlaprandy dunlap20.51%15.26%
fujita tomonorifujita tomonori10.25%15.26%
Total394100.00%19100.00%
Directory: block
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