bcachefs: Split out debug_check_btree_accounting

This check is very expensive
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/bcachefs.h

@@ -265,6 +265,8 @@ do {									\
 	BCH_DEBUG_PARAM(debug_check_bkeys,				\
 		"Run bkey_debugcheck (primarily checking GC/allocation "\
 		"information) when iterating over keys")		\
+	BCH_DEBUG_PARAM(debug_check_btree_accounting,			\
+		"Verify btree accounting for keys within a node")	\
 	BCH_DEBUG_PARAM(verify_btree_ondisk,				\
 		"Reread btree nodes at various points to verify the "	\
 		"mergesort in the read path against modifications "	\

fs/bcachefs/bset.h

@@ -658,7 +658,7 @@ static inline void bch2_verify_insert_pos(struct btree *b,
 
 static inline void bch2_verify_btree_nr_keys(struct btree *b)
 {
-	if (bch2_expensive_debug_checks)
+	if (bch2_debug_check_btree_accounting)
 		__bch2_verify_btree_nr_keys(b);
 }