block: unify flags for struct bio and struct request

Remove the current bio flags and reuse the request flags for the bio, too.
This allows to more easily trace the type of I/O from the filesystem
down to the block driver.  There were two flags in the bio that were
missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
renamed two request flags that had a superflous RW in them.

Note that the flags are in bio.h despite having the REQ_ name - as
blkdev.h includes bio.h that is the only way to go for now.

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

1 files changed, 11 insertions, 11 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index dff4870..cba1deb 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1180,7 +1180,7 @@ next_bio:
 	bio->bi_sector = sector;
 	bio->bi_bdev = mdev->ldev->backing_bdev;
 	/* we special case some flags in the multi-bio case, see below
-	 * (BIO_RW_UNPLUG, BIO_RW_BARRIER) */
+	 * (REQ_UNPLUG, REQ_HARDBARRIER) */
 	bio->bi_rw = rw;
 	bio->bi_private = e;
 	bio->bi_end_io = drbd_endio_sec;
@@ -1209,16 +1209,16 @@ next_bio:
 		bios = bios->bi_next;
 		bio->bi_next = NULL;
 
-		/* strip off BIO_RW_UNPLUG unless it is the last bio */
+		/* strip off REQ_UNPLUG unless it is the last bio */
 		if (bios)
-			bio->bi_rw &= ~(1<<BIO_RW_UNPLUG);
+			bio->bi_rw &= ~REQ_UNPLUG;
 
 		drbd_generic_make_request(mdev, fault_type, bio);
 
-		/* strip off BIO_RW_BARRIER,
+		/* strip off REQ_HARDBARRIER,
 		 * unless it is the first or last bio */
 		if (bios && bios->bi_next)
-			bios->bi_rw &= ~(1<<BIO_RW_BARRIER);
+			bios->bi_rw &= ~REQ_HARDBARRIER;
 	} while (bios);
 	maybe_kick_lo(mdev);
 	return 0;
@@ -1233,7 +1233,7 @@ fail:
 }
 
 /**
- * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set
+ * w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set
  * @mdev:	DRBD device.
  * @w:		work object.
  * @cancel:	The connection will be closed anyways (unused in this callback)
@@ -1245,7 +1245,7 @@ int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __relea
 	   (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
 	   so that we can finish that epoch in drbd_may_finish_epoch().
 	   That is necessary if we already have a long chain of Epochs, before
-	   we realize that BIO_RW_BARRIER is actually not supported */
+	   we realize that REQ_HARDBARRIER is actually not supported */
 
 	/* As long as the -ENOTSUPP on the barrier is reported immediately
 	   that will never trigger. If it is reported late, we will just
@@ -1824,14 +1824,14 @@ static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
 		epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
 		if (epoch == e->epoch) {
 			set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
-			rw |= (1<<BIO_RW_BARRIER);
+			rw |= REQ_HARDBARRIER;
 			e->flags |= EE_IS_BARRIER;
 		} else {
 			if (atomic_read(&epoch->epoch_size) > 1 ||
 			    !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
 				set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
 				set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
-				rw |= (1<<BIO_RW_BARRIER);
+				rw |= REQ_HARDBARRIER;
 				e->flags |= EE_IS_BARRIER;
 			}
 		}
@@ -1841,10 +1841,10 @@ static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
 	dp_flags = be32_to_cpu(p->dp_flags);
 	if (dp_flags & DP_HARDBARRIER) {
 		dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n");
-		/* rw |= (1<<BIO_RW_BARRIER); */
+		/* rw |= REQ_HARDBARRIER; */
 	}
 	if (dp_flags & DP_RW_SYNC)
-		rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
+		rw |= REQ_SYNC | REQ_UNPLUG;
 	if (dp_flags & DP_MAY_SET_IN_SYNC)
 		e->flags |= EE_MAY_SET_IN_SYNC;