bcachefs: bch2_trans_locked()

Useful debugging function.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_iter.h

@@ -207,6 +207,7 @@ void bch2_path_put(struct btree_trans *, struct btree_path *, bool);
 
 int bch2_trans_relock(struct btree_trans *);
 void bch2_trans_unlock(struct btree_trans *);
+bool bch2_trans_locked(struct btree_trans *);
 
 static inline bool trans_was_restarted(struct btree_trans *trans, u32 restart_count)
 {

fs/bcachefs/btree_locking.c

@@ -666,6 +666,16 @@ void bch2_trans_unlock(struct btree_trans *trans)
 		__bch2_btree_path_unlock(trans, path);
 }
 
+bool bch2_trans_locked(struct btree_trans *trans)
+{
+	struct btree_path *path;
+
+	trans_for_each_path(trans, path)
+		if (path->nodes_locked)
+			return true;
+	return false;
+}
+
 /* Debug */
 
 #ifdef CONFIG_BCACHEFS_DEBUG