diff options
Diffstat (limited to 'block/elevator.c')
| -rw-r--r-- | block/elevator.c | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/block/elevator.c b/block/elevator.c index ed6f8f32d27..59173a69ebd 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -34,8 +34,9 @@ #include <linux/delay.h> #include <linux/blktrace_api.h> #include <linux/hash.h> +#include <linux/uaccess.h> -#include <asm/uaccess.h> +#include "blk.h" static DEFINE_SPINLOCK(elv_list_lock); static LIST_HEAD(elv_list); @@ -75,6 +76,12 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio) return 0; /* + * Don't merge file system requests and discard requests + */ + if (bio_discard(bio) != bio_discard(rq->bio)) + return 0; + + /* * different data direction or already started, don't merge */ if (bio_data_dir(bio) != rq_data_dir(rq)) @@ -438,6 +445,8 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) list_for_each_prev(entry, &q->queue_head) { struct request *pos = list_entry_rq(entry); + if (blk_discard_rq(rq) != blk_discard_rq(pos)) + break; if (rq_data_dir(rq) != rq_data_dir(pos)) break; if (pos->cmd_flags & stop_flags) @@ -603,11 +612,11 @@ void elv_insert(struct request_queue *q, struct request *rq, int where) * processing. */ blk_remove_plug(q); - q->request_fn(q); + blk_start_queueing(q); break; case ELEVATOR_INSERT_SORT: - BUG_ON(!blk_fs_request(rq)); + BUG_ON(!blk_fs_request(rq) && !blk_discard_rq(rq)); rq->cmd_flags |= REQ_SORTED; q->nr_sorted++; if (rq_mergeable(rq)) { @@ -692,7 +701,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where, * this request is scheduling boundary, update * end_sector */ - if (blk_fs_request(rq)) { + if (blk_fs_request(rq) || blk_discard_rq(rq)) { q->end_sector = rq_end_sector(rq); q->boundary_rq = rq; } @@ -745,7 +754,7 @@ struct request *elv_next_request(struct request_queue *q) * not ever see it. */ if (blk_empty_barrier(rq)) { - end_queued_request(rq, 1); + __blk_end_request(rq, 0, blk_rq_bytes(rq)); continue; } if (!(rq->cmd_flags & REQ_STARTED)) { @@ -764,6 +773,12 @@ struct request *elv_next_request(struct request_queue *q) */ rq->cmd_flags |= REQ_STARTED; blk_add_trace_rq(q, rq, BLK_TA_ISSUE); + + /* + * We are now handing the request to the hardware, + * add the timeout handler + */ + blk_add_timer(rq); } if (!q->boundary_rq || q->boundary_rq == rq) { @@ -782,7 +797,6 @@ struct request *elv_next_request(struct request_queue *q) * device can handle */ rq->nr_phys_segments++; - rq->nr_hw_segments++; } if (!q->prep_rq_fn) @@ -805,14 +819,13 @@ struct request *elv_next_request(struct request_queue *q) * so that we don't add it again */ --rq->nr_phys_segments; - --rq->nr_hw_segments; } rq = NULL; break; } else if (ret == BLKPREP_KILL) { rq->cmd_flags |= REQ_QUIET; - end_queued_request(rq, 0); + __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); } else { printk(KERN_ERR "%s: bad return=%d\n", __func__, ret); break; @@ -901,6 +914,19 @@ int elv_may_queue(struct request_queue *q, int rw) return ELV_MQUEUE_MAY; } +void elv_abort_queue(struct request_queue *q) +{ + struct request *rq; + + while (!list_empty(&q->queue_head)) { + rq = list_entry_rq(q->queue_head.next); + rq->cmd_flags |= REQ_QUIET; + blk_add_trace_rq(q, rq, BLK_TA_ABORT); + __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); + } +} +EXPORT_SYMBOL(elv_abort_queue); + void elv_completed_request(struct request_queue *q, struct request *rq) { elevator_t *e = q->elevator; @@ -924,7 +950,7 @@ void elv_completed_request(struct request_queue *q, struct request *rq) blk_ordered_cur_seq(q) == QUEUE_ORDSEQ_DRAIN && blk_ordered_req_seq(first_rq) > QUEUE_ORDSEQ_DRAIN) { blk_ordered_complete_seq(q, QUEUE_ORDSEQ_DRAIN, 0); - q->request_fn(q); + blk_start_queueing(q); } } } @@ -1083,8 +1109,7 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e) elv_drain_elevator(q); while (q->rq.elvpriv) { - blk_remove_plug(q); - q->request_fn(q); + blk_start_queueing(q); spin_unlock_irq(q->queue_lock); msleep(10); spin_lock_irq(q->queue_lock); @@ -1140,15 +1165,10 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name, size_t count) { char elevator_name[ELV_NAME_MAX]; - size_t len; struct elevator_type *e; - elevator_name[sizeof(elevator_name) - 1] = '\0'; - strncpy(elevator_name, name, sizeof(elevator_name) - 1); - len = strlen(elevator_name); - - if (len && elevator_name[len - 1] == '\n') - elevator_name[len - 1] = '\0'; + strlcpy(elevator_name, name, sizeof(elevator_name)); + strstrip(elevator_name); e = elevator_get(elevator_name); if (!e) { |