bcachefs: kill btree_path->(alloc_seq|downgrade_seq)

These were for extra info in tracepoints for debugging a specialized
issue - we do not want to bloat btree_path for this, at least in release
builds.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_iter.c

@@ -1539,7 +1539,6 @@ static inline struct btree_path *btree_path_alloc(struct btree_trans *trans,
 	path->ref		= 0;
 	path->intent_ref	= 0;
 	path->nodes_locked	= 0;
-	path->alloc_seq++;
 
 	btree_path_list_add(trans, pos, path);
 	trans->paths_sorted = false;

fs/bcachefs/btree_locking.c

@@ -708,7 +708,6 @@ void __bch2_btree_path_downgrade(struct btree_trans *trans,
 
 	bch2_btree_path_verify_locks(path);
 
-	path->downgrade_seq++;
 	trace_path_downgrade(trans, _RET_IP_, path, old_locks_want);
 }
 

fs/bcachefs/btree_types.h

@@ -227,8 +227,6 @@ struct btree_path {
 	u8			sorted_idx;
 	u8			ref;
 	u8			intent_ref;
-	u32			alloc_seq;
-	u32			downgrade_seq;
 
 	/* btree_iter_copy starts here: */
 	struct bpos		pos;

fs/bcachefs/trace.h

@@ -1145,8 +1145,6 @@ TRACE_EVENT(trans_restart_upgrade,
 		__field(u8,			level		)
 		__field(u32,			path_seq	)
 		__field(u32,			node_seq	)
-		__field(u32,			path_alloc_seq	)
-		__field(u32,			downgrade_seq)
 		TRACE_BPOS_entries(pos)
 	),
 
@@ -1159,12 +1157,10 @@ TRACE_EVENT(trans_restart_upgrade,
 		__entry->level			= f->l;
 		__entry->path_seq		= path->l[f->l].lock_seq;
 		__entry->node_seq		= IS_ERR_OR_NULL(f->b) ? 0 : f->b->c.lock.seq;
-		__entry->path_alloc_seq		= path->alloc_seq;
-		__entry->downgrade_seq		= path->downgrade_seq;
 		TRACE_BPOS_assign(pos, path->pos)
 	),
 
-	TP_printk("%s %pS btree %s pos %llu:%llu:%u locks_want %u -> %u level %u path seq %u node seq %u alloc_seq %u downgrade_seq %u",
+	TP_printk("%s %pS btree %s pos %llu:%llu:%u locks_want %u -> %u level %u path seq %u node seq %u",
 		  __entry->trans_fn,
 		  (void *) __entry->caller_ip,
 		  bch2_btree_id_str(__entry->btree_id),
@@ -1175,9 +1171,7 @@ TRACE_EVENT(trans_restart_upgrade,
 		  __entry->new_locks_want,
 		  __entry->level,
 		  __entry->path_seq,
-		  __entry->node_seq,
-		  __entry->path_alloc_seq,
-		  __entry->downgrade_seq)
+		  __entry->node_seq)
 );
 
 DEFINE_EVENT(transaction_restart_iter,	trans_restart_relock,