block: remove struct request buffer member

This was used in the olden days, back when onions were proper
yellow. Basically it mapped to the current buffer to be
transferred. With highmem being added more than a decade ago,
most drivers map pages out of a bio, and rq->buffer isn't
pointing at anything valid.

Convert old style drivers to just use bio_data().

For the discard payload use case, just reference the page
in the bio.

Signed-off-by: Jens Axboe <axboe@fb.com>

3 files changed, 5 insertions, 5 deletions

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index e76bdc074dbe..719cb1bc1640 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -747,7 +747,7 @@ static void do_pcd_request(struct request_queue * q)
                         pcd_current = cd;
                         pcd_sector = blk_rq_pos(pcd_req);
                         pcd_count = blk_rq_cur_sectors(pcd_req);
-                        pcd_buf = pcd_req->buffer;
+                        pcd_buf = bio_data(pcd_req->bio);
                         pcd_busy = 1;
                         ps_set_intr(do_pcd_read, NULL, 0, nice);
                         return;
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 19ad8f0c83ef..fea7e76a00de 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -454,7 +454,7 @@ static enum action do_pd_io_start(void)
                 if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
                         return Fail;
                 pd_run = blk_rq_sectors(pd_req);
-                pd_buf = pd_req->buffer;
+                pd_buf = bio_data(pd_req->bio);
                 pd_retries = 0;
                 if (pd_cmd == READ)
                         return do_pd_read_start();
@@ -485,7 +485,7 @@ static int pd_next_buf(void)
         spin_lock_irqsave(&pd_lock, saved_flags);
         __blk_end_request_cur(pd_req, 0);
         pd_count = blk_rq_cur_sectors(pd_req);
-        pd_buf = pd_req->buffer;
+        pd_buf = bio_data(pd_req->bio);
         spin_unlock_irqrestore(&pd_lock, saved_flags);
         return 0;
 }
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index f5c86d523ba0..9a15fd3c9349 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -795,7 +795,7 @@ repeat:
         }
 
         pf_cmd = rq_data_dir(pf_req);
-        pf_buf = pf_req->buffer;
+        pf_buf = bio_data(pf_req->bio);
         pf_retries = 0;
 
         pf_busy = 1;
@@ -827,7 +827,7 @@ static int pf_next_buf(void)
                 if (!pf_req)
                         return 1;
                 pf_count = blk_rq_cur_sectors(pf_req);
-                pf_buf = pf_req->buffer;
+                pf_buf = bio_data(pf_req->bio);
         }
         return 0;
 }