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Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c55
1 files changed, 27 insertions, 28 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index acc73ba8bade..5f6ae79b8b16 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -121,7 +121,7 @@
int sysctl_unix_max_dgram_qlen = 10;
struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
-DEFINE_RWLOCK(unix_table_lock);
+DEFINE_SPINLOCK(unix_table_lock);
static atomic_t unix_nr_socks = ATOMIC_INIT(0);
#define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
@@ -130,7 +130,7 @@ static atomic_t unix_nr_socks = ATOMIC_INIT(0);
/*
* SMP locking strategy:
- * hash table is protected with rwlock unix_table_lock
+ * hash table is protected with spinlock unix_table_lock
* each socket state is protected by separate rwlock.
*/
@@ -214,16 +214,16 @@ static void __unix_insert_socket(struct hlist_head *list, struct sock *sk)
static inline void unix_remove_socket(struct sock *sk)
{
- write_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
__unix_remove_socket(sk);
- write_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
}
static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk)
{
- write_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
__unix_insert_socket(list, sk);
- write_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
}
static struct sock *__unix_find_socket_byname(struct sockaddr_un *sunname,
@@ -250,11 +250,11 @@ static inline struct sock *unix_find_socket_byname(struct sockaddr_un *sunname,
{
struct sock *s;
- read_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
s = __unix_find_socket_byname(sunname, len, type, hash);
if (s)
sock_hold(s);
- read_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
return s;
}
@@ -263,7 +263,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i)
struct sock *s;
struct hlist_node *node;
- read_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
sk_for_each(s, node,
&unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
struct dentry *dentry = unix_sk(s)->dentry;
@@ -276,7 +276,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i)
}
s = NULL;
found:
- read_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
return s;
}
@@ -473,7 +473,7 @@ static int unix_dgram_connect(struct socket *, struct sockaddr *,
static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *,
struct msghdr *, size_t);
-static struct proto_ops unix_stream_ops = {
+static const struct proto_ops unix_stream_ops = {
.family = PF_UNIX,
.owner = THIS_MODULE,
.release = unix_release,
@@ -494,7 +494,7 @@ static struct proto_ops unix_stream_ops = {
.sendpage = sock_no_sendpage,
};
-static struct proto_ops unix_dgram_ops = {
+static const struct proto_ops unix_dgram_ops = {
.family = PF_UNIX,
.owner = THIS_MODULE,
.release = unix_release,
@@ -515,7 +515,7 @@ static struct proto_ops unix_dgram_ops = {
.sendpage = sock_no_sendpage,
};
-static struct proto_ops unix_seqpacket_ops = {
+static const struct proto_ops unix_seqpacket_ops = {
.family = PF_UNIX,
.owner = THIS_MODULE,
.release = unix_release,
@@ -564,7 +564,7 @@ static struct sock * unix_create1(struct socket *sock)
u = unix_sk(sk);
u->dentry = NULL;
u->mnt = NULL;
- rwlock_init(&u->lock);
+ spin_lock_init(&u->lock);
atomic_set(&u->inflight, sock ? 0 : -1);
init_MUTEX(&u->readsem); /* single task reading lock */
init_waitqueue_head(&u->peer_wait);
@@ -642,12 +642,12 @@ retry:
addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short);
addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0));
- write_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
ordernum = (ordernum+1)&0xFFFFF;
if (__unix_find_socket_byname(addr->name, addr->len, sock->type,
addr->hash)) {
- write_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
/* Sanity yield. It is unusual case, but yet... */
if (!(ordernum&0xFF))
yield();
@@ -658,7 +658,7 @@ retry:
__unix_remove_socket(sk);
u->addr = addr;
__unix_insert_socket(&unix_socket_table[addr->hash], sk);
- write_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
err = 0;
out: up(&u->readsem);
@@ -791,7 +791,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
addr->hash = UNIX_HASH_SIZE;
}
- write_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
if (!sunaddr->sun_path[0]) {
err = -EADDRINUSE;
@@ -814,7 +814,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
__unix_insert_socket(list, sk);
out_unlock:
- write_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
out_up:
up(&u->readsem);
out:
@@ -1063,10 +1063,12 @@ restart:
/* Set credentials */
sk->sk_peercred = other->sk_peercred;
- sock_hold(newsk);
- unix_peer(sk) = newsk;
sock->state = SS_CONNECTED;
sk->sk_state = TCP_ESTABLISHED;
+ sock_hold(newsk);
+
+ smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */
+ unix_peer(sk) = newsk;
unix_state_wunlock(sk);
@@ -1414,7 +1416,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
} else {
sunaddr = NULL;
err = -ENOTCONN;
- other = unix_peer_get(sk);
+ other = unix_peer(sk);
if (!other)
goto out_err;
}
@@ -1476,7 +1478,6 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
other->sk_data_ready(other, size);
sent+=size;
}
- sock_put(other);
scm_destroy(siocb->scm);
siocb->scm = NULL;
@@ -1491,8 +1492,6 @@ pipe_err:
send_sig(SIGPIPE,current,0);
err = -EPIPE;
out_err:
- if (other)
- sock_put(other);
scm_destroy(siocb->scm);
siocb->scm = NULL;
return sent ? : err;
@@ -1860,7 +1859,7 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
}
default:
- err = dev_ioctl(cmd, (void __user *)arg);
+ err = -ENOIOCTLCMD;
break;
}
return err;
@@ -1917,7 +1916,7 @@ static struct sock *unix_seq_idx(int *iter, loff_t pos)
static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
{
- read_lock(&unix_table_lock);
+ spin_lock(&unix_table_lock);
return *pos ? unix_seq_idx(seq->private, *pos - 1) : ((void *) 1);
}
@@ -1932,7 +1931,7 @@ static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
static void unix_seq_stop(struct seq_file *seq, void *v)
{
- read_unlock(&unix_table_lock);
+ spin_unlock(&unix_table_lock);
}
static int unix_seq_show(struct seq_file *seq, void *v)
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