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block: remove support for bio remapping from ->make_request

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There is very little benefit in allowing to let a ->make_request
instance update the bios device and sector and loop around it in
__generic_make_request when we can archive the same through calling
generic_make_request from the driver and letting the loop in
generic_make_request handle it.

Note that various drivers got the return value from ->make_request and
returned non-zero values for errors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig
2011-09-12 12:12:01 +02:00
committed by Jens Axboe
parent c20e8de27f
commit 5a7bbad27a
25 changed files with 155 additions and 219 deletions
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14
drivers/md/dm.c
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@@ -1388,7 +1388,7 @@ out:
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
static int _dm_request(struct request_queue *q, struct bio *bio)
static void _dm_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@@ -1409,12 +1409,12 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
queue_io(md, bio);
else
bio_io_error(bio);
return 0;
return;
}
__split_and_process_bio(md, bio);
up_read(&md->io_lock);
return 0;
return;
}
static int dm_request_based(struct mapped_device *md)
@@ -1422,14 +1422,14 @@ static int dm_request_based(struct mapped_device *md)
return blk_queue_stackable(md->queue);
}
static int dm_request(struct request_queue *q, struct bio *bio)
static void dm_request(struct request_queue *q, struct bio *bio)
{
struct mapped_device *md = q->queuedata;
if (dm_request_based(md))
return blk_queue_bio(q, bio);
return _dm_request(q, bio);
blk_queue_bio(q, bio);
else
_dm_request(q, bio);
}
void dm_dispatch_request(struct request *rq)