block/fs/drivers: remove rw argument from submit_bio

This has callers of submit_bio/submit_bio_wait set the bio->bi_rw
instead of passing it in. This makes that use the same as
generic_make_request and how we set the other bio fields.

Signed-off-by: Mike Christie <mchristi@redhat.com>

Fixed up fs/ext4/crypto.c

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/mm/page_io.c b/mm/page_io.c
index 242dba0..5a5fd66 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -259,7 +259,7 @@
 		bio_end_io_t end_write_func)
 {
 	struct bio *bio;
-	int ret, rw = WRITE;
+	int ret;
 	struct swap_info_struct *sis = page_swap_info(page);
 
 	if (sis->flags & SWP_FILE) {
@@ -317,12 +317,13 @@
 		ret = -ENOMEM;
 		goto out;
 	}
+	bio->bi_rw = WRITE;
 	if (wbc->sync_mode == WB_SYNC_ALL)
-		rw |= REQ_SYNC;
+		bio->bi_rw |= REQ_SYNC;
 	count_vm_event(PSWPOUT);
 	set_page_writeback(page);
 	unlock_page(page);
-	submit_bio(rw, bio);
+	submit_bio(bio);
 out:
 	return ret;
 }
@@ -369,8 +370,9 @@
 		ret = -ENOMEM;
 		goto out;
 	}
+	bio->bi_rw = READ;
 	count_vm_event(PSWPIN);
-	submit_bio(READ, bio);
+	submit_bio(bio);
 out:
 	return ret;
 }