[PATCH] block: support larger block pc requests

This patch modifies blk_rq_map/unmap_user() and the cdrom and scsi_ioctl.c
users so that it supports requests larger than bio by chaining them together.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 7ea0f48f8fa6..2df5cf4ec743 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2133,16 +2133,14 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
                 rq->timeout = 60 * HZ;
                 bio = rq->bio;
 
-                if (rq->bio)
-                        blk_queue_bounce(q, &rq->bio);
-
                 if (blk_execute_rq(q, cdi->disk, rq, 0)) {
                         struct request_sense *s = rq->sense;
                         ret = -EIO;
                         cdi->last_sense = s->sense_key;
                 }
 
-                if (blk_rq_unmap_user(bio, len))
+                rq->bio = bio;
+                if (blk_rq_unmap_user(rq))
                         ret = -EFAULT;
 
                 if (ret)