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unix: Show number of pending scm files of receive queue in fdinfo

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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 <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2019-12-09 13:03:46 +03:00 • committed by David S. Miller
parent b4653342b1
commit 3c32da19a8
2 changed files with 56 additions and 5 deletions
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5
include/net/af_unix.h
View file

@ -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)