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svc: Make close transport independent 

Move sk_list and sk_ready to svc_xprt. This involves close because these
lists are walked by svcs when closing all their transports. So I combined
the moving of these lists to svc_xprt with making close transport independent.

The svc_force_sock_close has been changed to svc_close_all and takes a list
as an argument. This removes some svc internals knowledge from the svcs.

This code races with module removal and transport addition.

Thanks to Simon Holm Thøgersen for a compile fix.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Cc: Simon Holm Thøgersen <odie@cs.aau.dk>
This commit is contained in:
Tom Tucker 2007-12-30 21:07:53 -06:00 committed by J. Bruce Fields
parent bb5cf160b2
commit 7a18208383
7 changed files with 62 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/lockd/svc.c
View File

@ -221,10 +221,10 @@ lockd(struct svc_rqst *rqstp)
static int find_xprt(struct svc_serv *serv, char *proto)
{
struct svc_sock *svsk;
struct svc_xprt *xprt;
int found = 0;
list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
if (strcmp(svsk->sk_xprt.xpt_class->xcl_name, proto) == 0) {
list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list)
if (strcmp(xprt->xpt_class->xcl_name, proto) == 0) {
found = 1;
break;
}

4
fs/nfsd/nfssvc.c
View File

@ -155,8 +155,8 @@ static int killsig; /* signal that was used to kill last nfsd */
static void nfsd_last_thread(struct svc_serv *serv)
{
/* When last nfsd thread exits we need to do some clean-up */
struct svc_sock *svsk;
list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
struct svc_xprt *xprt;
list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list)
lockd_down();
nfsd_serv = NULL;
nfsd_racache_shutdown();

2
include/linux/sunrpc/svc_xprt.h
View File

@ -36,6 +36,8 @@ struct svc_xprt {
struct svc_xprt_class *xpt_class;
struct svc_xprt_ops *xpt_ops;
struct kref xpt_ref;
struct list_head xpt_list;
struct list_head xpt_ready;
unsigned long xpt_flags;
#define XPT_BUSY 0 /* enqueued/receiving */
#define XPT_CONN 1 /* conn pending */

4
include/linux/sunrpc/svcsock.h
View File

@ -17,8 +17,6 @@
*/
struct svc_sock {
struct svc_xprt sk_xprt;
struct list_head sk_ready; /* list of ready sockets */
struct list_head sk_list; /* list of all sockets */
struct socket * sk_sock; /* berkeley socket layer */
struct sock * sk_sk; /* INET layer */
@ -51,7 +49,7 @@ struct svc_sock {
/*
* Function prototypes.
*/
void svc_force_close_socket(struct svc_sock *);
void svc_close_all(struct list_head *);
int svc_recv(struct svc_rqst *, long);
int svc_send(struct svc_rqst *);
void svc_drop(struct svc_rqst *);

9
net/sunrpc/svc.c
View File

@ -459,9 +459,6 @@ svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
void
svc_destroy(struct svc_serv *serv)
{
struct svc_sock *svsk;
struct svc_sock *tmp;
dprintk("svc: svc_destroy(%s, %d)\n",
serv->sv_program->pg_name,
serv->sv_nrthreads);
@ -476,14 +473,12 @@ svc_destroy(struct svc_serv *serv)
del_timer_sync(&serv->sv_temptimer);
list_for_each_entry_safe(svsk, tmp, &serv->sv_tempsocks, sk_list)
svc_force_close_socket(svsk);
svc_close_all(&serv->sv_tempsocks);
if (serv->sv_shutdown)
serv->sv_shutdown(serv);
list_for_each_entry_safe(svsk, tmp, &serv->sv_permsocks, sk_list)
svc_force_close_socket(svsk);
svc_close_all(&serv->sv_permsocks);
BUG_ON(!list_empty(&serv->sv_permsocks));
BUG_ON(!list_empty(&serv->sv_tempsocks));

2
net/sunrpc/svc_xprt.c
View File

@ -97,6 +97,8 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
xprt->xpt_ops = xcl->xcl_ops;
kref_init(&xprt->xpt_ref);
xprt->xpt_server = serv;
INIT_LIST_HEAD(&xprt->xpt_list);
INIT_LIST_HEAD(&xprt->xpt_ready);
}
EXPORT_SYMBOL_GPL(svc_xprt_init);

104
net/sunrpc/svcsock.c
View File

@ -81,11 +81,11 @@
static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
int *errp, int flags);
static void svc_delete_socket(struct svc_sock *svsk);
static void svc_delete_xprt(struct svc_xprt *xprt);
static void svc_udp_data_ready(struct sock *, int);
static int svc_udp_recvfrom(struct svc_rqst *);
static int svc_udp_sendto(struct svc_rqst *);
static void svc_close_socket(struct svc_sock *svsk);
static void svc_close_xprt(struct svc_xprt *xprt);
static void svc_sock_detach(struct svc_xprt *);
static void svc_sock_free(struct svc_xprt *);
@ -293,7 +293,7 @@ svc_sock_enqueue(struct svc_sock *svsk)
wake_up(&rqstp->rq_wait);
} else {
dprintk("svc: socket %p put into queue\n", svsk->sk_sk);
list_add_tail(&svsk->sk_ready, &pool->sp_sockets);
list_add_tail(&svsk->sk_xprt.xpt_ready, &pool->sp_sockets);
BUG_ON(svsk->sk_xprt.xpt_pool != pool);
}
@ -313,8 +313,8 @@ svc_sock_dequeue(struct svc_pool *pool)
return NULL;
svsk = list_entry(pool->sp_sockets.next,
struct svc_sock, sk_ready);
list_del_init(&svsk->sk_ready);
struct svc_sock, sk_xprt.xpt_ready);
list_del_init(&svsk->sk_xprt.xpt_ready);
dprintk("svc: socket %p dequeued, inuse=%d\n",
svsk->sk_sk, atomic_read(&svsk->sk_xprt.xpt_ref.refcount));
@ -572,7 +572,7 @@ svc_sock_names(char *buf, struct svc_serv *serv, char *toclose)
if (!serv)
return 0;
spin_lock_bh(&serv->sv_lock);
list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) {
list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
int onelen = one_sock_name(buf+len, svsk);
if (toclose && strcmp(toclose, buf+len) == 0)
closesk = svsk;
@ -584,7 +584,7 @@ svc_sock_names(char *buf, struct svc_serv *serv, char *toclose)
/* Should unregister with portmap, but you cannot
* unregister just one protocol...
*/
svc_close_socket(closesk);
svc_close_xprt(&closesk->sk_xprt);
else if (toclose)
return -ENOENT;
return len;
@ -1427,12 +1427,12 @@ svc_sock_update_bufs(struct svc_serv *serv)
spin_lock_bh(&serv->sv_lock);
list_for_each(le, &serv->sv_permsocks) {
struct svc_sock *svsk =
list_entry(le, struct svc_sock, sk_list);
list_entry(le, struct svc_sock, sk_xprt.xpt_list);
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
}
list_for_each(le, &serv->sv_tempsocks) {
struct svc_sock *svsk =
list_entry(le, struct svc_sock, sk_list);
list_entry(le, struct svc_sock, sk_xprt.xpt_list);
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
}
spin_unlock_bh(&serv->sv_lock);
@ -1469,7 +1469,7 @@ static void svc_check_conn_limits(struct svc_serv *serv)
*/
svsk = list_entry(serv->sv_tempsocks.prev,
struct svc_sock,
sk_list);
sk_xprt.xpt_list);
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
svc_xprt_get(&svsk->sk_xprt);
}
@ -1576,7 +1576,7 @@ svc_recv(struct svc_rqst *rqstp, long timeout)
len = 0;
if (test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)) {
dprintk("svc_recv: found XPT_CLOSE\n");
svc_delete_socket(svsk);
svc_delete_xprt(&svsk->sk_xprt);
} else if (test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags)) {
struct svc_xprt *newxpt;
newxpt = svsk->sk_xprt.xpt_ops->xpo_accept(&svsk->sk_xprt);
@ -1685,7 +1685,7 @@ svc_age_temp_sockets(unsigned long closure)
}
list_for_each_safe(le, next, &serv->sv_tempsocks) {
svsk = list_entry(le, struct svc_sock, sk_list);
svsk = list_entry(le, struct svc_sock, sk_xprt.xpt_list);
if (!test_and_set_bit(XPT_OLD, &svsk->sk_xprt.xpt_flags))
continue;
@ -1701,9 +1701,9 @@ svc_age_temp_sockets(unsigned long closure)
while (!list_empty(&to_be_aged)) {
le = to_be_aged.next;
/* fiddling the sk_list node is safe 'cos we're XPT_DETACHED */
/* fiddling the sk_xprt.xpt_list node is safe 'cos we're XPT_DETACHED */
list_del_init(le);
svsk = list_entry(le, struct svc_sock, sk_list);
svsk = list_entry(le, struct svc_sock, sk_xprt.xpt_list);
dprintk("queuing svsk %p for closing, %lu seconds old\n",
svsk, get_seconds() - svsk->sk_lastrecv);
@ -1757,7 +1757,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
svsk->sk_lastrecv = get_seconds();
spin_lock_init(&svsk->sk_lock);
INIT_LIST_HEAD(&svsk->sk_deferred);
INIT_LIST_HEAD(&svsk->sk_ready);
mutex_init(&svsk->sk_mutex);
/* Initialize the socket */
@ -1769,7 +1768,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
spin_lock_bh(&serv->sv_lock);
if (is_temporary) {
set_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
list_add(&svsk->sk_list, &serv->sv_tempsocks);
list_add(&svsk->sk_xprt.xpt_list, &serv->sv_tempsocks);
serv->sv_tmpcnt++;
if (serv->sv_temptimer.function == NULL) {
/* setup timer to age temp sockets */
@ -1780,7 +1779,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
}
} else {
clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
list_add(&svsk->sk_list, &serv->sv_permsocks);
list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
}
spin_unlock_bh(&serv->sv_lock);
@ -1912,66 +1911,63 @@ static void svc_sock_free(struct svc_xprt *xprt)
}
/*
* Remove a dead socket
* Remove a dead transport
*/
static void
svc_delete_socket(struct svc_sock *svsk)
static void svc_delete_xprt(struct svc_xprt *xprt)
{
struct svc_serv *serv;
struct sock *sk;
struct svc_serv *serv = xprt->xpt_server;
dprintk("svc: svc_delete_socket(%p)\n", svsk);
serv = svsk->sk_xprt.xpt_server;
sk = svsk->sk_sk;
svsk->sk_xprt.xpt_ops->xpo_detach(&svsk->sk_xprt);
dprintk("svc: svc_delete_xprt(%p)\n", xprt);
xprt->xpt_ops->xpo_detach(xprt);
spin_lock_bh(&serv->sv_lock);
if (!test_and_set_bit(XPT_DETACHED, &svsk->sk_xprt.xpt_flags))
list_del_init(&svsk->sk_list);
if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags))
list_del_init(&xprt->xpt_list);
/*
* We used to delete the svc_sock from whichever list
* it's sk_ready node was on, but we don't actually
* We used to delete the transport from whichever list
* it's sk_xprt.xpt_ready node was on, but we don't actually
* need to. This is because the only time we're called
* while still attached to a queue, the queue itself
* is about to be destroyed (in svc_destroy).
*/
if (!test_and_set_bit(XPT_DEAD, &svsk->sk_xprt.xpt_flags)) {
BUG_ON(atomic_read(&svsk->sk_xprt.xpt_ref.refcount) < 2);
if (test_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags))
if (!test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) {
BUG_ON(atomic_read(&xprt->xpt_ref.refcount) < 2);
if (test_bit(XPT_TEMP, &xprt->xpt_flags))
serv->sv_tmpcnt--;
svc_xprt_put(&svsk->sk_xprt);
svc_xprt_put(xprt);
}
spin_unlock_bh(&serv->sv_lock);
}
static void svc_close_socket(struct svc_sock *svsk)
static void svc_close_xprt(struct svc_xprt *xprt)
{
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
if (test_and_set_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags))
set_bit(XPT_CLOSE, &xprt->xpt_flags);
if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags))
/* someone else will have to effect the close */
return;
svc_xprt_get(&svsk->sk_xprt);
svc_delete_socket(svsk);
clear_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags);
svc_xprt_put(&svsk->sk_xprt);
svc_xprt_get(xprt);
svc_delete_xprt(xprt);
clear_bit(XPT_BUSY, &xprt->xpt_flags);
svc_xprt_put(xprt);
}
void svc_force_close_socket(struct svc_sock *svsk)
void svc_close_all(struct list_head *xprt_list)
{
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
if (test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)) {
/* Waiting to be processed, but no threads left,
* So just remove it from the waiting list
*/
list_del_init(&svsk->sk_ready);
clear_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags);
struct svc_xprt *xprt;
struct svc_xprt *tmp;
list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) {
set_bit(XPT_CLOSE, &xprt->xpt_flags);
if (test_bit(XPT_BUSY, &xprt->xpt_flags)) {
/* Waiting to be processed, but no threads left,
* So just remove it from the waiting list
*/
list_del_init(&xprt->xpt_ready);
clear_bit(XPT_BUSY, &xprt->xpt_flags);
}
svc_close_xprt(xprt);
}
svc_close_socket(svsk);
}
/*