block: cleanup rq->data_len usages

With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes().  Convert all non-IDE direct
users to accessors.  IDE will be converted in a separate patch.

Boaz: spotted incorrect data_len/resid_len conversion in osd.

[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 39b3acfc0ddf..3d16c70fbde0 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
 static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
 {
         struct request *req = cmd->request;
-        unsigned int dlen = req->data_len;
-        unsigned int next_dlen = req->next_rq->data_len;
 
         req->resid_len = scsi_out(cmd)->resid;
         req->next_rq->resid_len = scsi_in(cmd)->resid;
 
         /* The req and req->next_rq have not been completed */
-        BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
+        BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
+                                    blk_rq_bytes(req->next_rq)));
 
         scsi_release_buffers(cmd);
 
@@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
         BUG_ON(count > sdb->table.nents);
         sdb->table.nents = count;
         if (blk_pc_request(req))
-                sdb->length = req->data_len;
+                sdb->length = blk_rq_bytes(req);
         else
                 sdb->length = blk_rq_sectors(req) << 9;
         return BLKPREP_OK;
@@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
                 if (unlikely(ret))
                         return ret;
         } else {
-                BUG_ON(req->data_len);
+                BUG_ON(blk_rq_bytes(req));
 
                 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
                 req->buffer = NULL;
         }
 
         cmd->cmd_len = req->cmd_len;
-        if (!req->data_len)
+        if (!blk_rq_bytes(req))
                 cmd->sc_data_direction = DMA_NONE;
         else if (rq_data_dir(req) == WRITE)
                 cmd->sc_data_direction = DMA_TO_DEVICE;
         else
                 cmd->sc_data_direction = DMA_FROM_DEVICE;
         
-        cmd->transfersize = req->data_len;
+        cmd->transfersize = blk_rq_bytes(req);
         cmd->allowed = req->retries;
         return BLKPREP_OK;
 }