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NFS bugfixes for Linux 3.7

Browse Source 
- Fix the NFSv2/v3 kernel statd protocol, which broke due to net namespace
   related changes.
 - Fix a number of races in the SUNRPC TCP disconnect/reconnect code.
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Merge tag 'nfs-for-3.7-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS bugfixes from Trond Myklebust:

 - Fix the NFSv2/v3 kernel statd protocol, which broke due to net
   namespace related changes.

 - Fix a number of races in the SUNRPC TCP disconnect/reconnect code.

* tag 'nfs-for-3.7-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  LOCKD: Clear ln->nsm_clnt only when ln->nsm_users is zero
  LOCKD: fix races in nsm_client_get
  SUNRPC: Get rid of the xs_error_report socket callback
  SUNRPC: Prevent races in xs_abort_connection()
  Revert "SUNRPC: Ensure we close the socket on EPIPE errors too..."
  SUNRPC: Clear the connect flag when socket state is TCP_CLOSE_WAIT
This commit is contained in:
Linus Torvalds 2012-10-25 19:26:16 -07:00
commit fec4fba6e4
2 changed files with 42 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
fs/lockd/mon.c
View File

@ -85,29 +85,38 @@ static struct rpc_clnt *nsm_create(struct net *net)
return rpc_create(&args);
}
static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,
struct rpc_clnt *clnt)
{
spin_lock(&ln->nsm_clnt_lock);
if (ln->nsm_users == 0) {
if (clnt == NULL)
goto out;
ln->nsm_clnt = clnt;
}
clnt = ln->nsm_clnt;
ln->nsm_users++;
out:
spin_unlock(&ln->nsm_clnt_lock);
return clnt;
}
static struct rpc_clnt *nsm_client_get(struct net *net)
{
static DEFINE_MUTEX(nsm_create_mutex);
struct rpc_clnt *clnt;
struct rpc_clnt *clnt, *new;
struct lockd_net *ln = net_generic(net, lockd_net_id);
spin_lock(&ln->nsm_clnt_lock);
if (ln->nsm_users) {
ln->nsm_users++;
clnt = ln->nsm_clnt;
spin_unlock(&ln->nsm_clnt_lock);
clnt = nsm_client_set(ln, NULL);
if (clnt != NULL)
goto out;
}
spin_unlock(&ln->nsm_clnt_lock);
mutex_lock(&nsm_create_mutex);
clnt = nsm_create(net);
if (!IS_ERR(clnt)) {
ln->nsm_clnt = clnt;
smp_wmb();
ln->nsm_users = 1;
}
mutex_unlock(&nsm_create_mutex);
clnt = new = nsm_create(net);
if (IS_ERR(clnt))
goto out;
clnt = nsm_client_set(ln, new);
if (clnt != new)
rpc_shutdown_client(new);
out:
return clnt;
}
@ -115,18 +124,16 @@ out:
static void nsm_client_put(struct net *net)
{
struct lockd_net *ln = net_generic(net, lockd_net_id);
struct rpc_clnt *clnt = ln->nsm_clnt;
int shutdown = 0;
struct rpc_clnt *clnt = NULL;
spin_lock(&ln->nsm_clnt_lock);
if (ln->nsm_users) {
if (--ln->nsm_users)
ln->nsm_clnt = NULL;
shutdown = !ln->nsm_users;
ln->nsm_users--;
if (ln->nsm_users == 0) {
clnt = ln->nsm_clnt;
ln->nsm_clnt = NULL;
}
spin_unlock(&ln->nsm_clnt_lock);
if (shutdown)
if (clnt != NULL)
rpc_shutdown_client(clnt);
}

41
net/sunrpc/xprtsock.c
View File

@ -254,7 +254,6 @@ struct sock_xprt {
void (*old_data_ready)(struct sock *, int);
void (*old_state_change)(struct sock *);
void (*old_write_space)(struct sock *);
void (*old_error_report)(struct sock *);
};
/*
@ -737,10 +736,10 @@ static int xs_tcp_send_request(struct rpc_task *task)
dprintk("RPC: sendmsg returned unrecognized error %d\n",
-status);
case -ECONNRESET:
case -EPIPE:
xs_tcp_shutdown(xprt);
case -ECONNREFUSED:
case -ENOTCONN:
case -EPIPE:
clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
}
@ -781,7 +780,6 @@ static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
transport->old_data_ready = sk->sk_data_ready;
transport->old_state_change = sk->sk_state_change;
transport->old_write_space = sk->sk_write_space;
transport->old_error_report = sk->sk_error_report;
}
static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
@ -789,7 +787,6 @@ static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *s
sk->sk_data_ready = transport->old_data_ready;
sk->sk_state_change = transport->old_state_change;
sk->sk_write_space = transport->old_write_space;
sk->sk_error_report = transport->old_error_report;
}
static void xs_reset_transport(struct sock_xprt *transport)
@ -1453,7 +1450,7 @@ static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
xprt_clear_connecting(xprt);
}
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
{
smp_mb__before_clear_bit();
clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
@ -1461,6 +1458,11 @@ static void xs_sock_mark_closed(struct rpc_xprt *xprt)
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
clear_bit(XPRT_CLOSING, &xprt->state);
smp_mb__after_clear_bit();
}
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
{
xs_sock_reset_connection_flags(xprt);
/* Mark transport as closed and wake up all pending tasks */
xprt_disconnect_done(xprt);
}
@ -1516,6 +1518,7 @@ static void xs_tcp_state_change(struct sock *sk)
case TCP_CLOSE_WAIT:
/* The server initiated a shutdown of the socket */
xprt->connect_cookie++;
clear_bit(XPRT_CONNECTED, &xprt->state);
xs_tcp_force_close(xprt);
case TCP_CLOSING:
/*
@ -1540,25 +1543,6 @@ static void xs_tcp_state_change(struct sock *sk)
read_unlock_bh(&sk->sk_callback_lock);
}
/**
* xs_error_report - callback mainly for catching socket errors
* @sk: socket
*/
static void xs_error_report(struct sock *sk)
{
struct rpc_xprt *xprt;
read_lock_bh(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk)))
goto out;
dprintk("RPC: %s client %p...\n"
"RPC: error %d\n",
__func__, xprt, sk->sk_err);
xprt_wake_pending_tasks(xprt, -EAGAIN);
out:
read_unlock_bh(&sk->sk_callback_lock);
}
static void xs_write_space(struct sock *sk)
{
struct socket *sock;
@ -1858,7 +1842,6 @@ static int xs_local_finish_connecting(struct rpc_xprt *xprt,
sk->sk_user_data = xprt;
sk->sk_data_ready = xs_local_data_ready;
sk->sk_write_space = xs_udp_write_space;
sk->sk_error_report = xs_error_report;
sk->sk_allocation = GFP_ATOMIC;
xprt_clear_connected(xprt);
@ -1983,7 +1966,6 @@ static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
sk->sk_user_data = xprt;
sk->sk_data_ready = xs_udp_data_ready;
sk->sk_write_space = xs_udp_write_space;
sk->sk_error_report = xs_error_report;
sk->sk_no_check = UDP_CSUM_NORCV;
sk->sk_allocation = GFP_ATOMIC;
@ -2050,10 +2032,8 @@ static void xs_abort_connection(struct sock_xprt *transport)
any.sa_family = AF_UNSPEC;
result = kernel_connect(transport->sock, &any, sizeof(any), 0);
if (!result)
xs_sock_mark_closed(&transport->xprt);
else
dprintk("RPC: AF_UNSPEC connect return code %d\n",
result);
xs_sock_reset_connection_flags(&transport->xprt);
dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
}
static void xs_tcp_reuse_connection(struct sock_xprt *transport)
@ -2098,7 +2078,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
sk->sk_data_ready = xs_tcp_data_ready;
sk->sk_state_change = xs_tcp_state_change;
sk->sk_write_space = xs_tcp_write_space;
sk->sk_error_report = xs_error_report;
sk->sk_allocation = GFP_ATOMIC;
/* socket options */