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[PATCH] lockdep: annotate nfs/nfsd in-kernel sockets 

Stick NFS sockets in their own class to avoid some lockdep warnings.  NFS
sockets are never exposed to user-space, and will hence not trigger certain
code paths that would otherwise pose deadlock scenarios.

[akpm@osdl.org: cleanups]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Steven Dickson <SteveD@redhat.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Acked-by: Neil Brown <neilb@suse.de>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
[ Fixed patch corruption by quilt, pointed out by Peter Zijlstra ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Zijlstra 2006-12-06 20:35:24 -08:00 committed by Linus Torvalds
parent b9d85b08c6
commit ed07536ed6
5 changed files with 87 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/sock.h
View File

@ -746,6 +746,25 @@ static inline int sk_stream_wmem_schedule(struct sock *sk, int size)
*/
#define sock_owned_by_user(sk) ((sk)->sk_lock.owner)
/*
* Macro so as to not evaluate some arguments when
* lockdep is not enabled.
*
* Mark both the sk_lock and the sk_lock.slock as a
* per-address-family lock class.
*/
#define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
do { \
sk->sk_lock.owner = NULL; \
init_waitqueue_head(&sk->sk_lock.wq); \
spin_lock_init(&(sk)->sk_lock.slock); \
debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
sizeof((sk)->sk_lock)); \
lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
(skey), (sname)); \
lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
} while (0)
extern void FASTCALL(lock_sock_nested(struct sock *sk, int subclass));
static inline void lock_sock(struct sock *sk)

1
kernel/lockdep.c
View File

@ -2645,6 +2645,7 @@ void debug_check_no_locks_freed(const void *mem_from, unsigned long mem_len)
}
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(debug_check_no_locks_freed);
static void print_held_locks_bug(struct task_struct *curr)
{

23
net/core/sock.c
View File

@ -810,24 +810,11 @@ lenout:
*/
static void inline sock_lock_init(struct sock *sk)
{
spin_lock_init(&sk->sk_lock.slock);
sk->sk_lock.owner = NULL;
init_waitqueue_head(&sk->sk_lock.wq);
/*
* Make sure we are not reinitializing a held lock:
*/
debug_check_no_locks_freed((void *)&sk->sk_lock, sizeof(sk->sk_lock));
/*
* Mark both the sk_lock and the sk_lock.slock as a
* per-address-family lock class:
*/
lockdep_set_class_and_name(&sk->sk_lock.slock,
af_family_slock_keys + sk->sk_family,
af_family_slock_key_strings[sk->sk_family]);
lockdep_init_map(&sk->sk_lock.dep_map,
af_family_key_strings[sk->sk_family],
af_family_keys + sk->sk_family, 0);
sock_lock_init_class_and_name(sk,
af_family_slock_key_strings[sk->sk_family],
af_family_slock_keys + sk->sk_family,
af_family_key_strings[sk->sk_family],
af_family_keys + sk->sk_family);
}
/**

31
net/sunrpc/svcsock.c
View File

@ -85,6 +85,35 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req);
*/
static int svc_conn_age_period = 6*60;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key svc_key[2];
static struct lock_class_key svc_slock_key[2];
static inline void svc_reclassify_socket(struct socket *sock)
{
struct sock *sk = sock->sk;
BUG_ON(sk->sk_lock.owner != NULL);
switch (sk->sk_family) {
case AF_INET:
sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
&svc_slock_key[0], "sk_lock-AF_INET-NFSD", &svc_key[0]);
break;
case AF_INET6:
sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
&svc_slock_key[1], "sk_lock-AF_INET6-NFSD", &svc_key[1]);
break;
default:
BUG();
}
}
#else
static inline void svc_reclassify_socket(struct socket *sock)
{
}
#endif
/*
* Queue up an idle server thread. Must have pool->sp_lock held.
* Note: this is really a stack rather than a queue, so that we only
@ -1557,6 +1586,8 @@ svc_create_socket(struct svc_serv *serv, int protocol, struct sockaddr_in *sin)
if ((error = sock_create_kern(PF_INET, type, protocol, &sock)) < 0)
return error;
svc_reclassify_socket(sock);
if (type == SOCK_STREAM)
sock->sk->sk_reuse = 1; /* allow address reuse */
error = kernel_bind(sock, (struct sockaddr *) sin,

31
net/sunrpc/xprtsock.c
View File

@ -1058,6 +1058,35 @@ static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
return err;
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key xs_key[2];
static struct lock_class_key xs_slock_key[2];
static inline void xs_reclassify_socket(struct socket *sock)
{
struct sock *sk = sock->sk;
BUG_ON(sk->sk_lock.owner != NULL);
switch (sk->sk_family) {
case AF_INET:
sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
&xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
break;
case AF_INET6:
sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
&xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
break;
default:
BUG();
}
}
#else
static inline void xs_reclassify_socket(struct socket *sock)
{
}
#endif
/**
* xs_udp_connect_worker - set up a UDP socket
* @work: RPC transport to connect
@ -1081,6 +1110,7 @@ static void xs_udp_connect_worker(struct work_struct *work)
dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
goto out;
}
xs_reclassify_socket(sock);
if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
sock_release(sock);
@ -1165,6 +1195,7 @@ static void xs_tcp_connect_worker(struct work_struct *work)
dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
goto out;
}
xs_reclassify_socket(sock);
if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
sock_release(sock);