block: kill merge_bvec_fn() completely

[mirror_ubuntu-bionic-kernel.git] / drivers / block / rbd.c

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index dcc86937f55ca323184c89d27db2e25d60c59493..71dd061a7e11154e1c044e009c73de734cf389da 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3462,52 +3462,6 @@ static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx,
        return BLK_MQ_RQ_QUEUE_OK;
 }
 
-/*
- * a queue callback. Makes sure that we don't create a bio that spans across
- * multiple osd objects. One exception would be with a single page bios,
- * which we handle later at bio_chain_clone_range()
- */
-static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
-                         struct bio_vec *bvec)
-{
-       struct rbd_device *rbd_dev = q->queuedata;
-       sector_t sector_offset;
-       sector_t sectors_per_obj;
-       sector_t obj_sector_offset;
-       int ret;
-
-       /*
-        * Find how far into its rbd object the partition-relative
-        * bio start sector is to offset relative to the enclosing
-        * device.
-        */
-       sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector;
-       sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT);
-       obj_sector_offset = sector_offset & (sectors_per_obj - 1);
-
-       /*
-        * Compute the number of bytes from that offset to the end
-        * of the object.  Account for what's already used by the bio.
-        */
-       ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT;
-       if (ret > bmd->bi_size)
-               ret -= bmd->bi_size;
-       else
-               ret = 0;
-
-       /*
-        * Don't send back more than was asked for.  And if the bio
-        * was empty, let the whole thing through because:  "Note
-        * that a block device *must* allow a single page to be
-        * added to an empty bio."
-        */
-       rbd_assert(bvec->bv_len <= PAGE_SIZE);
-       if (ret > (int) bvec->bv_len || !bmd->bi_size)
-               ret = (int) bvec->bv_len;
-
-       return ret;
-}
-
 static void rbd_free_disk(struct rbd_device *rbd_dev)
 {
        struct gendisk *disk = rbd_dev->disk;
@@ -3806,7 +3760,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
        blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE);
        q->limits.discard_zeroes_data = 1;
 
-       blk_queue_merge_bvec(q, rbd_merge_bvec);
        disk->queue = q;
 
        q->queuedata = rbd_dev;