block: split scsi_request out of struct request

And require all drivers that want to support BLOCK_PC to allocate it
as the first thing of their private data.  To support this the legacy
IDE and BSG code is switched to set cmd_size on their queues to let
the block layer allocate the additional space.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 0 insertions, 17 deletions

diff --git a/block/blk-exec.c b/block/blk-exec.c
index ed1f10165268..ed51800f4b44 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -11,11 +11,6 @@
 #include "blk.h"
 #include "blk-mq-sched.h"
 
-/*
- * for max sense size
- */
-#include <scsi/scsi_cmnd.h>
-
 /**
  * blk_end_sync_rq - executes a completion event on a request
  * @rq: request to complete
@@ -101,16 +96,9 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
                    struct request *rq, int at_head)
 {
         DECLARE_COMPLETION_ONSTACK(wait);
-        char sense[SCSI_SENSE_BUFFERSIZE];
         int err = 0;
         unsigned long hang_check;
 
-        if (!rq->sense) {
-                memset(sense, 0, sizeof(sense));
-                rq->sense = sense;
-                rq->sense_len = 0;
-        }
-
         rq->end_io_data = &wait;
         blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);
 
@@ -124,11 +112,6 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
         if (rq->errors)
                 err = -EIO;
 
-        if (rq->sense == sense) {
-                rq->sense = NULL;
-                rq->sense_len = 0;
-        }
-
         return err;
 }
 EXPORT_SYMBOL(blk_execute_rq);