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SUNRPC: Get rid of the redundant xprt->shutdown bit field 

It is only set after everyone has dereferenced the transport,
and serves no useful purpose: setting it is racy, so all the
socket code, etc still needs to be able to cope with the cases
where they miss reading it.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-09-11 17:21:25 -04:00
parent dcfc4f2546
commit d19751e7b9
4 changed files with 10 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/sunrpc/xprt.h
View File

@ -173,8 +173,7 @@ struct rpc_xprt {
unsigned int min_reqs; /* min number of slots */
atomic_t num_reqs; /* total slots */
unsigned long state; /* transport state */
unsigned char shutdown : 1, /* being shut down */
resvport : 1; /* use a reserved port */
unsigned char resvport : 1; /* use a reserved port */
unsigned int swapper; /* we're swapping over this
transport */
unsigned int bind_index; /* bind function index */

8
net/sunrpc/xprt.c
View File

@ -231,7 +231,7 @@ EXPORT_SYMBOL_GPL(xprt_reserve_xprt);
static void xprt_clear_locked(struct rpc_xprt *xprt)
{
xprt->snd_task = NULL;
if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) {
if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) {
smp_mb__before_clear_bit();
clear_bit(XPRT_LOCKED, &xprt->state);
smp_mb__after_clear_bit();
@ -504,9 +504,6 @@ EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space);
*/
void xprt_write_space(struct rpc_xprt *xprt)
{
if (unlikely(xprt->shutdown))
return;
spin_lock_bh(&xprt->transport_lock);
if (xprt->snd_task) {
dprintk("RPC: write space: waking waiting task on "
@ -679,7 +676,7 @@ xprt_init_autodisconnect(unsigned long data)
struct rpc_xprt *xprt = (struct rpc_xprt *)data;
spin_lock(&xprt->transport_lock);
if (!list_empty(&xprt->recv) || xprt->shutdown)
if (!list_empty(&xprt->recv))
goto out_abort;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
goto out_abort;
@ -1262,7 +1259,6 @@ out:
static void xprt_destroy(struct rpc_xprt *xprt)
{
dprintk("RPC: destroying transport %p\n", xprt);
xprt->shutdown = 1;
del_timer_sync(&xprt->timer);
rpc_destroy_wait_queue(&xprt->binding);

20
net/sunrpc/xprtrdma/transport.c
View File

@ -199,21 +199,15 @@ xprt_rdma_connect_worker(struct work_struct *work)
struct rpc_xprt *xprt = &r_xprt->xprt;
int rc = 0;
if (!xprt->shutdown) {
current->flags |= PF_FSTRANS;
xprt_clear_connected(xprt);
current->flags |= PF_FSTRANS;
xprt_clear_connected(xprt);
dprintk("RPC: %s: %sconnect\n", __func__,
r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
if (rc)
goto out;
}
goto out_clear;
dprintk("RPC: %s: %sconnect\n", __func__,
r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
if (rc)
xprt_wake_pending_tasks(xprt, rc);
out:
xprt_wake_pending_tasks(xprt, rc);
out_clear:
dprintk("RPC: %s: exit\n", __func__);
xprt_clear_connecting(xprt);
current->flags &= ~PF_FSTRANS;

18
net/sunrpc/xprtsock.c
View File

@ -917,9 +917,6 @@ static void xs_local_data_ready(struct sock *sk, int len)
if (skb == NULL)
goto out;
if (xprt->shutdown)
goto dropit;
repsize = skb->len - sizeof(rpc_fraghdr);
if (repsize < 4) {
dprintk("RPC: impossible RPC reply size %d\n", repsize);
@ -981,9 +978,6 @@ static void xs_udp_data_ready(struct sock *sk, int len)
if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
goto out;
if (xprt->shutdown)
goto dropit;
repsize = skb->len - sizeof(struct udphdr);
if (repsize < 4) {
dprintk("RPC: impossible RPC reply size %d!\n", repsize);
@ -1412,9 +1406,6 @@ static void xs_tcp_data_ready(struct sock *sk, int bytes)
read_lock_bh(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk)))
goto out;
if (xprt->shutdown)
goto out;
/* Any data means we had a useful conversation, so
* the we don't need to delay the next reconnect
*/
@ -1901,9 +1892,6 @@ static void xs_local_setup_socket(struct work_struct *work)
struct socket *sock;
int status = -EIO;
if (xprt->shutdown)
goto out;
current->flags |= PF_FSTRANS;
clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
@ -2020,9 +2008,6 @@ static void xs_udp_setup_socket(struct work_struct *work)
struct socket *sock = transport->sock;
int status = -EIO;
if (xprt->shutdown)
goto out;
current->flags |= PF_FSTRANS;
/* Start by resetting any existing state */
@ -2168,9 +2153,6 @@ static void xs_tcp_setup_socket(struct work_struct *work)
struct rpc_xprt *xprt = &transport->xprt;
int status = -EIO;
if (xprt->shutdown)
goto out;
current->flags |= PF_FSTRANS;
if (!sock) {