block,fs: use REQ_* flags directly

Remove the WRITE_* and READ_SYNC wrappers, and just use the flags
directly.  Where applicable this also drops usage of the
bio_set_op_attrs wrapper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 3e57a56..594e02c 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -495,8 +495,10 @@ xfs_submit_ioend(
 
 	ioend->io_bio->bi_private = ioend;
 	ioend->io_bio->bi_end_io = xfs_end_bio;
-	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE,
-			 (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0);
+	ioend->io_bio->bi_opf = REQ_OP_WRITE;
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		ioend->io_bio->bi_opf |= REQ_SYNC;
+
 	/*
 	 * If we are failing the IO now, just mark the ioend with an
 	 * error and finish it. This will run IO completion immediately
@@ -567,8 +569,9 @@ xfs_chain_bio(
 
 	bio_chain(ioend->io_bio, new);
 	bio_get(ioend->io_bio);		/* for xfs_destroy_ioend */
-	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE,
-			  (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0);
+	ioend->io_bio->bi_opf = REQ_OP_WRITE;
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		ioend->io_bio->bi_opf |= REQ_SYNC;
 	submit_bio(ioend->io_bio);
 	ioend->io_bio = new;
 }