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[BLOCK] ll_rw_blk: Enable out-of-order request completions through softirq

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Request completion can be a quite heavy process, since it needs to
iterate through the entire request and complete the bio's it holds.
This patch adds blk_complete_request() which moves this processing
into a dedicated block softirq.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-01-09 16:02:34 +01:00
parent 5367f2d67c
commit ff856bad67
3 changed files with 124 additions and 4 deletions
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21
include/linux/blkdev.h
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@ -118,9 +118,9 @@ struct request_list {
* try to put the fields that are referenced together in the same cacheline
*/
struct request {
struct list_head queuelist; /* looking for ->queue? you must _not_
* access it directly, use
* blkdev_dequeue_request! */
struct list_head queuelist;
struct list_head donelist;
unsigned long flags; /* see REQ_ bits below */
/* Maintain bio traversal state for part by part I/O submission.
@ -141,6 +141,7 @@ struct request {
struct bio *biotail;
void *elevator_private;
void *completion_data;
unsigned short ioprio;
@ -291,6 +292,7 @@ typedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *);
typedef void (activity_fn) (void *data, int rw);
typedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *);
typedef void (prepare_flush_fn) (request_queue_t *, struct request *);
typedef void (softirq_done_fn)(struct request *);
enum blk_queue_state {
Queue_down,
@ -332,6 +334,7 @@ struct request_queue
activity_fn *activity_fn;
issue_flush_fn *issue_flush_fn;
prepare_flush_fn *prepare_flush_fn;
softirq_done_fn *softirq_done_fn;
/*
* Dispatch queue sorting
@ -646,6 +649,17 @@ extern int end_that_request_first(struct request *, int, int);
extern int end_that_request_chunk(struct request *, int, int);
extern void end_that_request_last(struct request *, int);
extern void end_request(struct request *req, int uptodate);
extern void blk_complete_request(struct request *);
static inline int rq_all_done(struct request *rq, unsigned int nr_bytes)
{
if (blk_fs_request(rq))
return (nr_bytes >= (rq->hard_nr_sectors << 9));
else if (blk_pc_request(rq))
return nr_bytes >= rq->data_len;
return 0;
}
/*
* end_that_request_first/chunk() takes an uptodate argument. we account
@ -694,6 +708,7 @@ extern void blk_queue_segment_boundary(request_queue_t *, unsigned long);
extern void blk_queue_prep_rq(request_queue_t *, prep_rq_fn *pfn);
extern void blk_queue_merge_bvec(request_queue_t *, merge_bvec_fn *);
extern void blk_queue_dma_alignment(request_queue_t *, int);
extern void blk_queue_softirq_done(request_queue_t *, softirq_done_fn *);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
extern int blk_queue_ordered(request_queue_t *, unsigned, prepare_flush_fn *);
extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *);