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[BLOCK] ll_rw_blk: separate out bio init part from __make_request

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Separate out bio initialization part from __make_request.  It
will be used by the following blk_ordered_reimpl.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Tejun Heo 2006-01-06 09:49:58 +01:00 committed by Jens Axboe
parent 8ffdc6550c
commit 52d9e67536
1 changed files with 33 additions and 29 deletions
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62
block/ll_rw_blk.c
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@ -36,6 +36,8 @@
static void blk_unplug_work(void *data);
static void blk_unplug_timeout(unsigned long data);
static void drive_stat_acct(struct request *rq, int nr_sectors, int new_io);
static void init_request_from_bio(struct request *req, struct bio *bio);
static int __make_request(request_queue_t *q, struct bio *bio);
/*
* For the allocated request tables
@ -1667,8 +1669,6 @@ static int blk_init_free_list(request_queue_t *q)
return 0;
}
static int __make_request(request_queue_t *, struct bio *);
request_queue_t *blk_alloc_queue(gfp_t gfp_mask)
{
return blk_alloc_queue_node(gfp_mask, -1);
@ -2659,6 +2659,36 @@ void blk_attempt_remerge(request_queue_t *q, struct request *rq)
EXPORT_SYMBOL(blk_attempt_remerge);
static void init_request_from_bio(struct request *req, struct bio *bio)
{
req->flags |= REQ_CMD;
/*
* inherit FAILFAST from bio (for read-ahead, and explicit FAILFAST)
*/
if (bio_rw_ahead(bio) || bio_failfast(bio))
req->flags |= REQ_FAILFAST;
/*
* REQ_BARRIER implies no merging, but lets make it explicit
*/
if (unlikely(bio_barrier(bio)))
req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
req->errors = 0;
req->hard_sector = req->sector = bio->bi_sector;
req->hard_nr_sectors = req->nr_sectors = bio_sectors(bio);
req->current_nr_sectors = req->hard_cur_sectors = bio_cur_sectors(bio);
req->nr_phys_segments = bio_phys_segments(req->q, bio);
req->nr_hw_segments = bio_hw_segments(req->q, bio);
req->buffer = bio_data(bio); /* see ->buffer comment above */
req->waiting = NULL;
req->bio = req->biotail = bio;
req->ioprio = bio_prio(bio);
req->rq_disk = bio->bi_bdev->bd_disk;
req->start_time = jiffies;
}
static int __make_request(request_queue_t *q, struct bio *bio)
{
struct request *req;
@ -2754,33 +2784,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
* We don't worry about that case for efficiency. It won't happen
* often, and the elevators are able to handle it.
*/
req->flags |= REQ_CMD;
/*
* inherit FAILFAST from bio (for read-ahead, and explicit FAILFAST)
*/
if (bio_rw_ahead(bio) || bio_failfast(bio))
req->flags |= REQ_FAILFAST;
/*
* REQ_BARRIER implies no merging, but lets make it explicit
*/
if (unlikely(barrier))
req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
req->errors = 0;
req->hard_sector = req->sector = sector;
req->hard_nr_sectors = req->nr_sectors = nr_sectors;
req->current_nr_sectors = req->hard_cur_sectors = cur_nr_sectors;
req->nr_phys_segments = bio_phys_segments(q, bio);
req->nr_hw_segments = bio_hw_segments(q, bio);
req->buffer = bio_data(bio); /* see ->buffer comment above */
req->waiting = NULL;
req->bio = req->biotail = bio;
req->ioprio = prio;
req->rq_disk = bio->bi_bdev->bd_disk;
req->start_time = jiffies;
init_request_from_bio(req, bio);
spin_lock_irq(q->queue_lock);
if (elv_queue_empty(q))