diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 94d346e..d955a49 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -736,10 +736,6 @@
 #define node(i, j)		((struct bkey *) ((i)->d + (j)))
 #define end(i)			node(i, (i)->keys)
 
-#define index(i, b)							\
-	((size_t) (((void *) i - (void *) (b)->sets[0].data) /		\
-		   block_bytes(b->c)))
-
 #define btree_data_space(b)	(PAGE_SIZE << (b)->page_order)
 
 #define prios_per_bucket(c)				\
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 5a6b752..8e2573a 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -258,7 +258,7 @@
 
 	err = "corrupted btree";
 	for (i = write_block(b);
-	     index(i, b) < btree_blocks(b);
+	     bset_sector_offset(b, i) < KEY_SIZE(&b->key);
 	     i = ((void *) i) + block_bytes(b->c))
 		if (i->seq == b->sets[0].data->seq)
 			goto err;
@@ -278,9 +278,9 @@
 	return;
 err:
 	set_btree_node_io_error(b);
-	bch_cache_set_error(b->c, "%s at bucket %zu, block %zu, %u keys",
+	bch_cache_set_error(b->c, "%s at bucket %zu, block %u, %u keys",
 			    err, PTR_BUCKET_NR(b->c, &b->key, 0),
-			    index(i, b), i->keys);
+			    bset_block_offset(b, i), i->keys);
 	goto out;
 }
 
diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h
index 4f0378a..12c99b1 100644
--- a/drivers/md/bcache/btree.h
+++ b/drivers/md/bcache/btree.h
@@ -185,6 +185,26 @@
 	return (((size_t) i) - ((size_t) b->sets->data)) >> 9;
 }
 
+static inline struct bset *btree_bset_first(struct btree *b)
+{
+	return b->sets->data;
+}
+
+static inline unsigned bset_byte_offset(struct btree *b, struct bset *i)
+{
+	return ((size_t) i) - ((size_t) b->sets->data);
+}
+
+static inline unsigned bset_sector_offset(struct btree *b, struct bset *i)
+{
+	return (((void *) i) - ((void *) btree_bset_first(b))) >> 9;
+}
+
+static inline unsigned bset_block_offset(struct btree *b, struct bset *i)
+{
+	return bset_sector_offset(b, i) >> b->c->block_bits;
+}
+
 static inline struct bset *write_block(struct btree *b)
 {
 	return ((void *) b->sets[0].data) + b->written * block_bytes(b->c);
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index fab3767..473e8d5 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -88,7 +88,7 @@
 		next = bkey_next(k);
 
 		bch_bkey_to_text(buf, sizeof(buf), k);
-		printk(KERN_ERR "block %zu key %zi/%u: %s", index(i, b),
+		printk(KERN_ERR "block %u key %zi/%u: %s", bset_block_offset(b, i),
 		       (uint64_t *) k - i->d, i->keys, buf);
 
 		for (j = 0; j < KEY_PTRS(k); j++) {