126 		struct unix_sock *u = unix_sk(s);  in unix_inflight()  local
128 		if (atomic_long_inc_return(&u->inflight) == 1) {  in unix_inflight()
129 			BUG_ON(!list_empty(&u->link));  in unix_inflight()
130 			list_add_tail(&u->link, &gc_inflight_list);  in unix_inflight()
132 			BUG_ON(list_empty(&u->link));  in unix_inflight()
147 		struct unix_sock *u = unix_sk(s);  in unix_notinflight()  local
149 		BUG_ON(!atomic_long_read(&u->inflight));  in unix_notinflight()
150 		BUG_ON(list_empty(&u->link));  in unix_notinflight()
152 		if (atomic_long_dec_and_test(&u->inflight))  in unix_notinflight()
153 			list_del_init(&u->link);  in unix_notinflight()
180 					struct unix_sock *u = unix_sk(sk);  in scan_inflight()  local
186 					if (test_bit(UNIX_GC_CANDIDATE, &u->gc_flags)) {  in scan_inflight()
189 						func(u);  in scan_inflight()
210 		struct unix_sock *u;  in scan_children()  local
218 			u = unix_sk(skb->sk);  in scan_children()
223 			BUG_ON(!list_empty(&u->link));  in scan_children()
224 			list_add_tail(&u->link, &embryos);  in scan_children()
229 			u = list_entry(embryos.next, struct unix_sock, link);  in scan_children()
230 			scan_inflight(&u->sk, func, hitlist);  in scan_children()
231 			list_del_init(&u->link);  in scan_children()
246 static void inc_inflight_move_tail(struct unix_sock *u)  in inc_inflight_move_tail()  argument
248 	atomic_long_inc(&u->inflight);  in inc_inflight_move_tail()
253 	if (test_bit(UNIX_GC_MAYBE_CYCLE, &u->gc_flags))  in inc_inflight_move_tail()
254 		list_move_tail(&u->link, &gc_candidates);  in inc_inflight_move_tail()
273 	struct unix_sock *u;  in unix_gc()  local
301 	list_for_each_entry_safe(u, next, &gc_inflight_list, link) {  in unix_gc()
305 		total_refs = file_count(u->sk.sk_socket->file);  in unix_gc()
306 		inflight_refs = atomic_long_read(&u->inflight);  in unix_gc()
311 			list_move_tail(&u->link, &gc_candidates);  in unix_gc()
312 			__set_bit(UNIX_GC_CANDIDATE, &u->gc_flags);  in unix_gc()
313 			__set_bit(UNIX_GC_MAYBE_CYCLE, &u->gc_flags);  in unix_gc()
320 	list_for_each_entry(u, &gc_candidates, link)  in unix_gc()
321 		scan_children(&u->sk, dec_inflight, NULL);  in unix_gc()
332 		u = list_entry(cursor.next, struct unix_sock, link);  in unix_gc()
335 		list_move(&cursor, &u->link);  in unix_gc()
337 		if (atomic_long_read(&u->inflight) > 0) {  in unix_gc()
338 			list_move_tail(&u->link, &not_cycle_list);  in unix_gc()
339 			__clear_bit(UNIX_GC_MAYBE_CYCLE, &u->gc_flags);  in unix_gc()
340 			scan_children(&u->sk, inc_inflight_move_tail, NULL);  in unix_gc()
350 	list_for_each_entry(u, &gc_candidates, link)  in unix_gc()
351 		scan_children(&u->sk, inc_inflight, &hitlist);  in unix_gc()
357 		u = list_entry(not_cycle_list.next, struct unix_sock, link);  in unix_gc()
358 		__clear_bit(UNIX_GC_CANDIDATE, &u->gc_flags);  in unix_gc()
359 		list_move_tail(&u->link, &gc_inflight_list);  in unix_gc()