From 3c32da19a858fb1ae8a76bf899160be49f338506 Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Mon, 9 Dec 2019 13:03:46 +0300 Subject: unix: Show number of pending scm files of receive queue in fdinfo Unix sockets like a block box. You never know what is stored there: there may be a file descriptor holding a mount or a block device, or there may be whole universes with namespaces, sockets with receive queues full of sockets etc. The patch adds a little debug and accounts number of files (not recursive), which is in receive queue of a unix socket. Sometimes this is useful to determine, that socket should be investigated or which task should be killed to put reference counter on a resourse. v2: Pass correct argument to lockdep Signed-off-by: Kirill Tkhai Signed-off-by: David S. Miller --- include/net/af_unix.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include') diff --git a/include/net/af_unix.h b/include/net/af_unix.h index 3426d6dacc45..17e10fba2152 100644 --- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -41,6 +41,10 @@ struct unix_skb_parms { u32 consumed; } __randomize_layout; +struct scm_stat { + u32 nr_fds; +}; + #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) @@ -65,6 +69,7 @@ struct unix_sock { #define UNIX_GC_MAYBE_CYCLE 1 struct socket_wq peer_wq; wait_queue_entry_t peer_wake; + struct scm_stat scm_stat; }; static inline struct unix_sock *unix_sk(const struct sock *sk) -- cgit v1.2.3