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-rw-r--r--fs/lockd/mon.c94
1 files changed, 75 insertions, 19 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 7ef14b3c5be..3c2cfc68363 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -7,7 +7,6 @@
*/
#include <linux/types.h>
-#include <linux/utsname.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/slab.h>
@@ -19,6 +18,8 @@
#include <asm/unaligned.h>
+#include "netns.h"
+
#define NLMDBG_FACILITY NLMDBG_MONITOR
#define NSM_PROGRAM 100024
#define NSM_VERSION 1
@@ -40,6 +41,7 @@ struct nsm_args {
u32 proc;
char *mon_name;
+ char *nodename;
};
struct nsm_res {
@@ -70,7 +72,7 @@ static struct rpc_clnt *nsm_create(struct net *net)
};
struct rpc_create_args args = {
.net = net,
- .protocol = XPRT_TRANSPORT_UDP,
+ .protocol = XPRT_TRANSPORT_TCP,
.address = (struct sockaddr *)&sin,
.addrsize = sizeof(sin),
.servername = "rpc.statd",
@@ -83,10 +85,61 @@ 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)
+{
+ struct rpc_clnt *clnt, *new;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ clnt = nsm_client_set(ln, NULL);
+ if (clnt != NULL)
+ goto out;
+
+ 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;
+}
+
+static void nsm_client_put(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+ struct rpc_clnt *clnt = NULL;
+
+ spin_lock(&ln->nsm_clnt_lock);
+ ln->nsm_users--;
+ if (ln->nsm_users == 0) {
+ clnt = ln->nsm_clnt;
+ ln->nsm_clnt = NULL;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+ if (clnt != NULL)
+ rpc_shutdown_client(clnt);
+}
+
static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
- struct net *net)
+ struct rpc_clnt *clnt)
{
- struct rpc_clnt *clnt;
int status;
struct nsm_args args = {
.priv = &nsm->sm_priv,
@@ -94,31 +147,22 @@ static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
.vers = 3,
.proc = NLMPROC_NSM_NOTIFY,
.mon_name = nsm->sm_mon_name,
+ .nodename = clnt->cl_nodename,
};
struct rpc_message msg = {
.rpc_argp = &args,
.rpc_resp = res,
};
- clnt = nsm_create(net);
- if (IS_ERR(clnt)) {
- status = PTR_ERR(clnt);
- dprintk("lockd: failed to create NSM upcall transport, "
- "status=%d\n", status);
- goto out;
- }
-
memset(res, 0, sizeof(*res));
msg.rpc_proc = &clnt->cl_procinfo[proc];
- status = rpc_call_sync(clnt, &msg, 0);
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
if (status < 0)
dprintk("lockd: NSM upcall RPC failed, status=%d\n",
status);
else
status = 0;
- rpc_shutdown_client(clnt);
- out:
return status;
}
@@ -138,6 +182,7 @@ int nsm_monitor(const struct nlm_host *host)
struct nsm_handle *nsm = host->h_nsmhandle;
struct nsm_res res;
int status;
+ struct rpc_clnt *clnt;
dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
@@ -150,7 +195,15 @@ int nsm_monitor(const struct nlm_host *host)
*/
nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
- status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, host->net);
+ clnt = nsm_client_get(host->net);
+ if (IS_ERR(clnt)) {
+ status = PTR_ERR(clnt);
+ dprintk("lockd: failed to create NSM upcall transport, "
+ "status=%d, net=%p\n", status, host->net);
+ return status;
+ }
+
+ status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, clnt);
if (unlikely(res.status != 0))
status = -EIO;
if (unlikely(status < 0)) {
@@ -182,9 +235,11 @@ void nsm_unmonitor(const struct nlm_host *host)
if (atomic_read(&nsm->sm_count) == 1
&& nsm->sm_monitored && !nsm->sm_sticky) {
+ struct lockd_net *ln = net_generic(host->net, lockd_net_id);
+
dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
- status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, host->net);
+ status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, ln->nsm_clnt);
if (res.status != 0)
status = -EIO;
if (status < 0)
@@ -192,6 +247,8 @@ void nsm_unmonitor(const struct nlm_host *host)
nsm->sm_name);
else
nsm->sm_monitored = 0;
+
+ nsm_client_put(host->net);
}
}
@@ -407,7 +464,6 @@ static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
const u32 len = strlen(string);
__be32 *p;
- BUG_ON(len > SM_MAXSTRLEN);
p = xdr_reserve_space(xdr, 4 + len);
xdr_encode_opaque(p, string, len);
}
@@ -430,7 +486,7 @@ static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
{
__be32 *p;
- encode_nsm_string(xdr, utsname()->nodename);
+ encode_nsm_string(xdr, argp->nodename);
p = xdr_reserve_space(xdr, 4 + 4 + 4);
*p++ = cpu_to_be32(argp->prog);
*p++ = cpu_to_be32(argp->vers);