diff options
Diffstat (limited to 'ANDROID_3.4.5/block/blk-exec.c')
-rw-r--r-- | ANDROID_3.4.5/block/blk-exec.c | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/ANDROID_3.4.5/block/blk-exec.c b/ANDROID_3.4.5/block/blk-exec.c deleted file mode 100644 index fb2cbd55..00000000 --- a/ANDROID_3.4.5/block/blk-exec.c +++ /dev/null @@ -1,121 +0,0 @@ -/* - * 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 "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; - __blk_put_request(rq->q, rq); - - /* - * complete last, if this is a stack request the process (and thus - * the rq pointer) could be invalid right after this complete() - */ - complete(waiting); -} - -/** - * 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. - */ -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()); - spin_lock_irq(q->queue_lock); - - if (unlikely(blk_queue_dead(q))) { - spin_unlock_irq(q->queue_lock); - rq->errors = -ENXIO; - if (rq->end_io) - rq->end_io(rq, rq->errors); - return; - } - - rq->rq_disk = bd_disk; - rq->end_io = done; - __elv_add_request(q, rq, where); - __blk_run_queue(q); - /* the queue is stopped so it won't be run */ - if (rq->cmd_type == REQ_TYPE_PM_RESUME) - q->request_fn(q); - spin_unlock_irq(q->queue_lock); -} -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; - - /* - * we need an extra reference to the request, so we can look at - * it after io completion - */ - rq->ref_count++; - - 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_timeout(&wait, hang_check * (HZ/2))); - else - wait_for_completion(&wait); - - if (rq->errors) - err = -EIO; - - return err; -} -EXPORT_SYMBOL(blk_execute_rq); |