bcache: Don't export utility code, prefix with bch_

Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: linux-bcache@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index a80ee53..93e7e31 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -95,7 +95,7 @@
 	    !dc->writeback_percent)
 		return 0;
 
-	return next_delay(&dc->writeback_rate, sectors * 10000000ULL);
+	return bch_next_delay(&dc->writeback_rate, sectors * 10000000ULL);
 }
 
 /* Background writeback */
@@ -118,7 +118,7 @@
 	bio->bi_max_vecs	= DIV_ROUND_UP(KEY_SIZE(&w->key), PAGE_SECTORS);
 	bio->bi_private		= w;
 	bio->bi_io_vec		= bio->bi_inline_vecs;
-	bio_map(bio, NULL);
+	bch_bio_map(bio, NULL);
 }
 
 static void refill_dirty(struct closure *cl)
@@ -349,7 +349,7 @@
 		io->bio.bi_rw		= READ;
 		io->bio.bi_end_io	= read_dirty_endio;
 
-		if (bio_alloc_pages(&io->bio, GFP_KERNEL))
+		if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))
 			goto err_free;
 
 		pr_debug("%s", pkey(&w->key));