bcache: Add explicit keylist arg to btree_insert()

Some refactoring - better to explicitly pass stuff around instead of
having it all in the "big bag of state", struct btree_op. Going to prune
struct btree_op quite a bit over time.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>

drivers/md/bcache/btree.c

@@ -2109,30 +2109,32 @@ int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
 	return ret;
 }
 
-static int bch_btree_insert_recurse(struct btree *b, struct btree_op *op)
+static int bch_btree_insert_recurse(struct btree *b, struct btree_op *op,
+				    struct keylist *keys)
 {
-	if (bch_keylist_empty(&op->keys))
+	if (bch_keylist_empty(keys))
 		return 0;
 
 	if (b->level) {
-		struct bkey *insert = op->keys.bottom;
-		struct bkey *k = bch_next_recurse_key(b, &START_KEY(insert));
+		struct bkey *k;
 
+		k = bch_next_recurse_key(b, &START_KEY(keys->bottom));
 		if (!k) {
 			btree_bug(b, "no key to recurse on at level %i/%i",
 				  b->level, b->c->root->level);
 
-			op->keys.top = op->keys.bottom;
+			keys->top = keys->bottom;
 			return -EIO;
 		}
 
-		return btree(insert_recurse, k, b, op);
+		return btree(insert_recurse, k, b, op, keys);
 	} else {
-		return bch_btree_insert_node(b, op, &op->keys);
+		return bch_btree_insert_node(b, op, keys);
 	}
 }
 
-int bch_btree_insert(struct btree_op *op, struct cache_set *c)
+int bch_btree_insert(struct btree_op *op, struct cache_set *c,
+		     struct keylist *keys)
 {
 	int ret = 0;
 
@@ -2142,11 +2144,11 @@ int bch_btree_insert(struct btree_op *op, struct cache_set *c)
 	 */
 	clear_closure_blocking(&op->cl);
 
-	BUG_ON(bch_keylist_empty(&op->keys));
+	BUG_ON(bch_keylist_empty(keys));
 
-	while (!bch_keylist_empty(&op->keys)) {
+	while (!bch_keylist_empty(keys)) {
 		op->lock = 0;
-		ret = btree_root(insert_recurse, c, op);
+		ret = btree_root(insert_recurse, c, op, keys);
 
 		if (ret == -EAGAIN) {
 			ret = 0;
@@ -2157,7 +2159,7 @@ int bch_btree_insert(struct btree_op *op, struct cache_set *c)
 			pr_err("error %i trying to insert key for %s",
 			       ret, op_type(op));
 
-			while ((k = bch_keylist_pop(&op->keys)))
+			while ((k = bch_keylist_pop(keys)))
 				bkey_put(c, k, 0);
 		}
 	}

drivers/md/bcache/btree.h

@@ -384,7 +384,7 @@ struct btree *bch_btree_node_get(struct cache_set *, struct bkey *,
 
 int bch_btree_insert_check_key(struct btree *, struct btree_op *,
 			       struct bkey *);
-int bch_btree_insert(struct btree_op *, struct cache_set *);
+int bch_btree_insert(struct btree_op *, struct cache_set *, struct keylist *);
 
 int bch_btree_search_recurse(struct btree *, struct btree_op *);
 

drivers/md/bcache/journal.c

@@ -320,7 +320,7 @@ int bch_journal_replay(struct cache_set *s, struct list_head *list,
 			op->journal = i->pin;
 			atomic_inc(op->journal);
 
-			ret = bch_btree_insert(op, s);
+			ret = bch_btree_insert(op, s, &op->keys);
 			if (ret)
 				goto err;
 

drivers/md/bcache/request.c

@@ -607,7 +607,7 @@ void bch_btree_insert_async(struct closure *cl)
 	struct btree_op *op = container_of(cl, struct btree_op, cl);
 	struct search *s = container_of(op, struct search, op);
 
-	if (bch_btree_insert(op, op->c)) {
+	if (bch_btree_insert(op, op->c, &op->keys)) {
 		s->error		= -ENOMEM;
 		op->insert_data_done	= true;
 	}

drivers/md/bcache/writeback.c

@@ -311,7 +311,7 @@ static void write_dirty_finish(struct closure *cl)
 		for (i = 0; i < KEY_PTRS(&w->key); i++)
 			atomic_inc(&PTR_BUCKET(dc->disk.c, &w->key, i)->pin);
 
-		bch_btree_insert(&op, dc->disk.c);
+		bch_btree_insert(&op, dc->disk.c, &op.keys);
 		closure_sync(&op.cl);
 
 		if (op.insert_collision)