diff options
| author | Greg Banks <gnb@melbourne.sgi.com> | 2006-10-02 02:17:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-02 07:57:19 -0700 |
| commit | 1a68d952af5f43032012d26dd0d5164c9e9986bc (patch) | |
| tree | 6c660f3ee27205a4c4f18883b2205f873cf396be | |
| parent | c45c357d7dbc9e94338f44349e0035149da86b26 (diff) | |
[PATCH] knfsd: use new lock for svc_sock deferred list
Protect the svc_sock->sk_deferred list with a new lock svc_sock->sk_defer_lock
instead of svc_serv->sv_lock. Using the more fine-grained lock reduces the
number of places we need to take the svc_serv lock.
Signed-off-by: Greg Banks <gnb@melbourne.sgi.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | include/linux/sunrpc/svcsock.h | 1 | ||||
| -rw-r--r-- | net/sunrpc/svcsock.c | 12 |
2 files changed, 7 insertions, 6 deletions
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h index 17cb834a748c..7766a1001660 100644 --- a/include/linux/sunrpc/svcsock.h +++ b/include/linux/sunrpc/svcsock.h @@ -36,6 +36,7 @@ struct svc_sock { int sk_reserved; /* space on outq that is reserved */ + spinlock_t sk_defer_lock; /* protects sk_deferred */ struct list_head sk_deferred; /* deferred requests that need to * be revisted */ struct mutex sk_mutex; /* to serialize sending data */ diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index d836031e4581..bdb5c2841db7 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -47,6 +47,7 @@ /* SMP locking strategy: * * svc_serv->sv_lock protects most stuff for that service. + * svc_sock->sk_defer_lock protects the svc_sock->sk_deferred list * * Some flags can be set to certain values at any time * providing that certain rules are followed: @@ -1416,6 +1417,7 @@ svc_setup_socket(struct svc_serv *serv, struct socket *sock, svsk->sk_server = serv; atomic_set(&svsk->sk_inuse, 0); svsk->sk_lastrecv = get_seconds(); + spin_lock_init(&svsk->sk_defer_lock); INIT_LIST_HEAD(&svsk->sk_deferred); INIT_LIST_HEAD(&svsk->sk_ready); mutex_init(&svsk->sk_mutex); @@ -1594,7 +1596,6 @@ svc_makesock(struct svc_serv *serv, int protocol, unsigned short port) static void svc_revisit(struct cache_deferred_req *dreq, int too_many) { struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle); - struct svc_serv *serv = dreq->owner; struct svc_sock *svsk; if (too_many) { @@ -1605,9 +1606,9 @@ static void svc_revisit(struct cache_deferred_req *dreq, int too_many) dprintk("revisit queued\n"); svsk = dr->svsk; dr->svsk = NULL; - spin_lock_bh(&serv->sv_lock); + spin_lock_bh(&svsk->sk_defer_lock); list_add(&dr->handle.recent, &svsk->sk_deferred); - spin_unlock_bh(&serv->sv_lock); + spin_unlock_bh(&svsk->sk_defer_lock); set_bit(SK_DEFERRED, &svsk->sk_flags); svc_sock_enqueue(svsk); svc_sock_put(svsk); @@ -1667,11 +1668,10 @@ static int svc_deferred_recv(struct svc_rqst *rqstp) static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk) { struct svc_deferred_req *dr = NULL; - struct svc_serv *serv = svsk->sk_server; if (!test_bit(SK_DEFERRED, &svsk->sk_flags)) return NULL; - spin_lock_bh(&serv->sv_lock); + spin_lock_bh(&svsk->sk_defer_lock); clear_bit(SK_DEFERRED, &svsk->sk_flags); if (!list_empty(&svsk->sk_deferred)) { dr = list_entry(svsk->sk_deferred.next, @@ -1680,6 +1680,6 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk) list_del_init(&dr->handle.recent); set_bit(SK_DEFERRED, &svsk->sk_flags); } - spin_unlock_bh(&serv->sv_lock); + spin_unlock_bh(&svsk->sk_defer_lock); return dr; } |