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SUNRPC: service destruction in network namespace context 

v2: Added comment to BUG_ON's in svc_destroy() to make code looks clearer.

This patch introduces network namespace filter for service destruction
function.
Nothing special here - just do exactly the same operations, but only for
tranports in passed networks namespace context.
BTW, BUG_ON() checks for empty service transports lists were returned into
svc_destroy() function. This is because of swithing generic svc_close_all() to
networks namespace dependable svc_close_net().

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Stanislav Kinsbursky 2012-01-31 14:09:17 +04:00 committed by Trond Myklebust
parent 3a22bf506c
commit 7b147f1ff2
3 changed files with 29 additions and 13 deletions
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2
include/linux/sunrpc/svcsock.h
View File

@ -34,7 +34,7 @@ struct svc_sock {
/*
* Function prototypes.
*/
void svc_close_all(struct svc_serv *);
void svc_close_net(struct svc_serv *, struct net *);
int svc_recv(struct svc_rqst *, long);
int svc_send(struct svc_rqst *);
void svc_drop(struct svc_rqst *);

13
net/sunrpc/svc.c
View File

@ -517,6 +517,8 @@ EXPORT_SYMBOL_GPL(svc_create_pooled);
void
svc_destroy(struct svc_serv *serv)
{
struct net *net = current->nsproxy->net_ns;
dprintk("svc: svc_destroy(%s, %d)\n",
serv->sv_program->pg_name,
serv->sv_nrthreads);
@ -539,10 +541,17 @@ svc_destroy(struct svc_serv *serv)
* caller is using--nfsd_mutex in the case of nfsd). So it's
* safe to traverse those lists and shut everything down:
*/
svc_close_all(serv);
svc_close_net(serv, net);
/*
* The last user is gone and thus all sockets have to be destroyed to
* the point. Check this.
*/
BUG_ON(!list_empty(&serv->sv_permsocks));
BUG_ON(!list_empty(&serv->sv_tempsocks));
if (serv->sv_shutdown)
serv->sv_shutdown(serv, current->nsproxy->net_ns);
serv->sv_shutdown(serv, net);
cache_clean_deferred(serv);

27
net/sunrpc/svc_xprt.c
View File

@ -922,17 +922,19 @@ void svc_close_xprt(struct svc_xprt *xprt)
}
EXPORT_SYMBOL_GPL(svc_close_xprt);
static void svc_close_list(struct list_head *xprt_list)
static void svc_close_list(struct list_head *xprt_list, struct net *net)
{
struct svc_xprt *xprt;
list_for_each_entry(xprt, xprt_list, xpt_list) {
if (xprt->xpt_net != net)
continue;
set_bit(XPT_CLOSE, &xprt->xpt_flags);
set_bit(XPT_BUSY, &xprt->xpt_flags);
}
}
static void svc_clear_pools(struct svc_serv *serv)
static void svc_clear_pools(struct svc_serv *serv, struct net *net)
{
struct svc_pool *pool;
struct svc_xprt *xprt;
@ -944,36 +946,41 @@ static void svc_clear_pools(struct svc_serv *serv)
spin_lock_bh(&pool->sp_lock);
list_for_each_entry_safe(xprt, tmp, &pool->sp_sockets, xpt_ready) {
if (xprt->xpt_net != net)
continue;
list_del_init(&xprt->xpt_ready);
}
spin_unlock_bh(&pool->sp_lock);
}
}
static void svc_clear_list(struct list_head *xprt_list)
static void svc_clear_list(struct list_head *xprt_list, struct net *net)
{
struct svc_xprt *xprt;
struct svc_xprt *tmp;
list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) {
if (xprt->xpt_net != net)
continue;
svc_delete_xprt(xprt);
}
BUG_ON(!list_empty(xprt_list));
list_for_each_entry(xprt, xprt_list, xpt_list)
BUG_ON(xprt->xpt_net == net);
}
void svc_close_all(struct svc_serv *serv)
void svc_close_net(struct svc_serv *serv, struct net *net)
{
svc_close_list(&serv->sv_tempsocks);
svc_close_list(&serv->sv_permsocks);
svc_close_list(&serv->sv_tempsocks, net);
svc_close_list(&serv->sv_permsocks, net);
svc_clear_pools(serv);
svc_clear_pools(serv, net);
/*
* At this point the sp_sockets lists will stay empty, since
* svc_enqueue will not add new entries without taking the
* sp_lock and checking XPT_BUSY.
*/
svc_clear_list(&serv->sv_tempsocks);
svc_clear_list(&serv->sv_permsocks);
svc_clear_list(&serv->sv_tempsocks, net);
svc_clear_list(&serv->sv_permsocks, net);
}
/*