FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
LinkBack Thread Tools
 
Old 05-25-2012, 08:25 PM
Kent Overstreet
 
Default dm: Kill merge_bvec_fn()

Signed-off-by: Kent Overstreet <koverstreet@google.com>
---
drivers/md/dm.c | 58 -------------------------------------------------------
1 file changed, 58 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 193fb19..a4c5256 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1309,63 +1309,6 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
* CRUD END
*---------------------------------------------------------------*/

-static int dm_merge_bvec(struct request_queue *q,
- struct bvec_merge_data *bvm,
- struct bio_vec *biovec)
-{
- struct mapped_device *md = q->queuedata;
- struct dm_table *map = dm_get_live_table(md);
- struct dm_target *ti;
- sector_t max_sectors;
- int max_size = 0;
-
- if (unlikely(!map))
- goto out;
-
- ti = dm_table_find_target(map, bvm->bi_sector);
- if (!dm_target_is_valid(ti))
- goto out_table;
-
- /*
- * Find maximum amount of I/O that won't need splitting
- */
- max_sectors = min(max_io_len(bvm->bi_sector, ti),
- (sector_t) BIO_MAX_SECTORS);
- max_size = (max_sectors << SECTOR_SHIFT) - bvm->bi_size;
- if (max_size < 0)
- max_size = 0;
-
- /*
- * merge_bvec_fn() returns number of bytes
- * it can accept at this offset
- * max is precomputed maximal io size
- */
- if (max_size && ti->type->merge)
- max_size = ti->type->merge(ti, bvm, biovec, max_size);
- /*
- * If the target doesn't support merge method and some of the devices
- * provided their merge_bvec method (we know this by looking at
- * queue_max_hw_sectors), then we can't allow bios with multiple vector
- * entries. So always set max_size to 0, and the code below allows
- * just one page.
- */
- else if (queue_max_hw_sectors(q) <= PAGE_SIZE >> 9)
-
- max_size = 0;
-
-out_table:
- dm_table_put(map);
-
-out:
- /*
- * Always allow an entire first page
- */
- if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT))
- max_size = biovec->bv_len;
-
- return max_size;
-}
-
/*
* The request function that just remaps the bio built up by
* dm_merge_bvec.
@@ -1766,7 +1709,6 @@ static void dm_init_md_queue(struct mapped_device *md)
md->queue->backing_dev_info.congested_data = md;
blk_queue_make_request(md->queue, dm_request);
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
- blk_queue_merge_bvec(md->queue, dm_merge_bvec);
}

/*
--
1.7.9.3.327.g2980b

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
 

Thread Tools




All times are GMT. The time now is 07:21 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org