From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
A migration event will replace the rpc_xprt used by an rpc_clnt. To
ensure this can be done safely, all references to cl_xprt must now use
a form of rcu_dereference().
Special care is taken with rpc_peeraddr2str(), which returns a pointer
to memory whose lifetime is the same as the rpc_xprt.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
[ cel: fix lockdep splats and layering violations ]
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Malahal Naineni <malahal@xxxxxxxxxx>
---
fs/nfs/callback_proc.c | 9 ++--
fs/nfs/client.c | 16 +++++--
fs/nfs/nfs4proc.c | 15 +++++--
fs/nfs/nfs4state.c | 25 ++++++++----
fs/nfs/super.c | 5 ++
include/linux/sunrpc/clnt.h | 4 +-
include/linux/sunrpc/debug.h | 11 +++++
net/sunrpc/clnt.c | 94 +++++++++++++++++++++++++++++++++++-------
net/sunrpc/rpc_pipe.c | 3 +
net/sunrpc/rpcb_clnt.c | 15 +++++--
net/sunrpc/stats.c | 6 ++-
11 files changed, 161 insertions(+), 42 deletions(-)
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 54cea8a..60ce755 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -8,6 +8,7 @@
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
+#include <linux/rcupdate.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
@@ -33,7 +34,7 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
res->bitmap[0] = res->bitmap[1] = 0;
res->status = htonl(NFS4ERR_BADHANDLE);
- dprintk("NFS: GETATTR callback request from %s\n",
+ dprintk_rcu("NFS: GETATTR callback request from %s\n",
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
inode = nfs_delegation_find_inode(cps->clp, &args->fh);
@@ -73,7 +74,7 @@ __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
goto out;
- dprintk("NFS: RECALL callback request from %s\n",
+ dprintk_rcu("NFS: RECALL callback request from %s\n",
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
res = htonl(NFS4ERR_BADHANDLE);
@@ -517,7 +518,7 @@ __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
if (!cps->clp) /* set in cb_sequence */
goto out;
- dprintk("NFS: RECALL_ANY callback request from %s\n",
+ dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
status = cpu_to_be32(NFS4ERR_INVAL);
@@ -552,7 +553,7 @@ __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
if (!cps->clp) /* set in cb_sequence */
goto out;
- dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
+ dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
args->crsa_target_max_slots);
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 31778f7..be5e702 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1284,16 +1284,18 @@ static int nfs4_init_callback(struct nfs_client *clp)
int error;
if (clp->rpc_ops->version == 4) {
+ struct rpc_xprt *xprt;
+
+ xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
+
if (nfs4_has_session(clp)) {
- error = xprt_setup_backchannel(
- clp->cl_rpcclient->cl_xprt,
+ error = xprt_setup_backchannel(xprt,
NFS41_BC_MIN_CALLBACKS);
if (error < 0)
return error;
}
- error = nfs_callback_up(clp->cl_mvops->minor_version,
- clp->cl_rpcclient->cl_xprt);
+ error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
if (error < 0) {
dprintk("%s: failed to start callback. Error = %d\n",
__func__, error);
@@ -1675,7 +1677,7 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
data->addrlen,
parent_client->cl_ipaddr,
data->authflavor,
- parent_server->client->cl_xprt->prot,
+ rpc_protocol(parent_server->client),
parent_server->client->cl_timeout,
parent_client->cl_mvops->minor_version);
if (error < 0)
@@ -1880,12 +1882,14 @@ static int nfs_server_list_show(struct seq_file *m, void *v)
if (clp->cl_cons_state != NFS_CS_READY)
return 0;
+ rcu_read_lock();
seq_printf(m, "v%u %s %s %3d %s\n",
clp->rpc_ops->version,
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
atomic_read(&clp->cl_count),
clp->cl_hostname);
+ rcu_read_unlock();
return 0;
}
@@ -1959,6 +1963,7 @@ static int nfs_volume_list_show(struct seq_file *m, void *v)
(unsigned long long) server->fsid.major,
(unsigned long long) server->fsid.minor);
+ rcu_read_lock();
seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
clp->rpc_ops->version,
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
@@ -1966,6 +1971,7 @@ static int nfs_volume_list_show(struct seq_file *m, void *v)
dev,
fsid,
nfs_server_fscache_state(server));
+ rcu_read_unlock();
return 0;
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f0c849c..6ceae67 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3789,6 +3789,7 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
*p = htonl((u32)clp->cl_boot_time.tv_nsec);
for(;;) {
+ rcu_read_lock();
setclientid.sc_name_len = scnprintf(setclientid.sc_name,
sizeof(setclientid.sc_name), "%s/%s %s %s %u",
clp->cl_ipaddr,
@@ -3805,6 +3806,7 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
sizeof(setclientid.sc_uaddr), "%s.%u.%u",
clp->cl_ipaddr, port >> 8, port & 255);
+ rcu_read_unlock();
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status != -NFS4ERR_CLID_INUSE)
@@ -5152,11 +5154,16 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
void nfs4_destroy_session(struct nfs4_session *session)
{
+ struct rpc_xprt *xprt;
+
nfs4_proc_destroy_session(session);
+
+ rcu_read_lock();
+ xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
+ rcu_read_unlock();
dprintk("%s Destroy backchannel for xprt %p\n",
- __func__, session->clp->cl_rpcclient->cl_xprt);
- xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
- NFS41_BC_MIN_CALLBACKS);
+ __func__, xprt);
+ xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
nfs4_destroy_slot_tables(session);
kfree(session);
}
@@ -5184,7 +5191,7 @@ static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
args->fc_attrs.max_rqst_sz = mxrqst_sz;
args->fc_attrs.max_resp_sz = mxresp_sz;
args->fc_attrs.max_ops = NFS4_MAX_OPS;
- args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
+ args->fc_attrs.max_reqs = rpc_max_reqs(session->clp->cl_rpcclient);
dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
"max_ops=%u max_reqs=%u\n",
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index a53f33b..c97bbc7 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1072,19 +1072,28 @@ static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
void nfs4_schedule_state_manager(struct nfs_client *clp)
{
struct task_struct *task;
+ char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
return;
__module_get(THIS_MODULE);
atomic_inc(&clp->cl_count);
- task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
- rpc_peeraddr2str(clp->cl_rpcclient,
- RPC_DISPLAY_ADDR));
- if (!IS_ERR(task))
- return;
- nfs4_clear_state_manager_bit(clp);
- nfs_put_client(clp);
- module_put(THIS_MODULE);
+
+ /* The rcu_read_lock() is not strictly necessary, as the state
+ * manager is the only thread that ever changes the rpc_xprt
+ * after it's initialized. At this point, we're single threaded. */
+ rcu_read_lock();
+ snprintf(buf, sizeof(buf), "%s-manager",
+ rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
+ rcu_read_unlock();
+ task = kthread_run(nfs4_run_state_manager, clp, buf);
+ if (IS_ERR(task)) {
+ printk(KERN_ERR "%s: kthread_run: %ld\n",
+ __func__, PTR_ERR(task));
+ nfs4_clear_state_manager_bit(clp);
+ nfs_put_client(clp);
+ module_put(THIS_MODULE);
+ }
}
/*
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 3dfa4f1..f2e7d7c 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -52,6 +52,7 @@
#include <linux/nfs_xdr.h>
#include <linux/magic.h>
#include <linux/parser.h>
+#include <linux/rcupdate.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -676,8 +677,10 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
else
seq_puts(m, nfs_infop->nostr);
}
+ rcu_read_lock();
seq_printf(m, ",proto=%s",
rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
+ rcu_read_unlock();
if (version == 4) {
if (nfss->port != NFS_PORT)
seq_printf(m, ",port=%u", nfss->port);
@@ -726,9 +729,11 @@ static int nfs_show_options(struct seq_file *m, struct dentry *root)
nfs_show_mount_options(m, nfss, 0);
+ rcu_read_lock();
seq_printf(m, ",addr=%s",
rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
RPC_DISPLAY_ADDR));
+ rcu_read_unlock();
return 0;
}
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index c85696e..a0a384f 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -37,7 +37,7 @@ struct rpc_clnt {
struct list_head cl_clients; /* Global list of clients */
struct list_head cl_tasks; /* List of tasks */
spinlock_t cl_lock; /* spinlock */
- struct rpc_xprt * cl_xprt; /* transport */
+ struct rpc_xprt __rcu * cl_xprt; /* transport */
struct rpc_procinfo * cl_procinfo; /* procedure info */
u32 cl_prog, /* RPC program number */
cl_vers, /* RPC version number */
@@ -167,6 +167,8 @@ struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
int rpc_restart_call_prepare(struct rpc_task *);
int rpc_restart_call(struct rpc_task *);
void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
+int rpc_protocol(struct rpc_clnt *);
+unsigned int rpc_max_reqs(struct rpc_clnt *);
size_t rpc_max_payload(struct rpc_clnt *);
void rpc_force_rebind(struct rpc_clnt *);
size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
index c2786f2..28136fd 100644
--- a/include/linux/sunrpc/debug.h
+++ b/include/linux/sunrpc/debug.h
@@ -47,15 +47,26 @@ extern unsigned int nlm_debug;
#endif
#define dprintk(args...) dfprintk(FACILITY, ## args)
+#define dprintk_rcu(args...) dfprintk_rcu(FACILITY, ## args)
#undef ifdebug
#ifdef RPC_DEBUG
# define ifdebug(fac) if (unlikely(rpc_debug & RPCDBG_##fac))
# define dfprintk(fac, args...) do { ifdebug(fac) printk(args); } while(0)
+
+# define dfprintk_rcu(fac, args...) \
+ do { \
+ ifdebug(fac) { \
+ rcu_read_lock(); \
+ printk(args); \
+ rcu_read_unlock(); \
+ } \
+ } while (0)
# define RPC_IFDEBUG(x) x
#else
# define ifdebug(fac) if (0)
# define dfprintk(fac, args...) do ; while (0)
+# define dfprintk_rcu(fac, args...) do ; while (0)
# define RPC_IFDEBUG(x)
#endif
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index b6a7817..e67eba3 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -31,6 +31,7 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/un.h>
+#include <linux/rcupdate.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
@@ -189,7 +190,7 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, stru
}
strlcpy(clnt->cl_server, args->servername, len);
- clnt->cl_xprt = xprt;
+ rcu_assign_pointer(clnt->cl_xprt, xprt);
clnt->cl_procinfo = version->procs;
clnt->cl_maxproc = version->nrprocs;
clnt->cl_protname = program->name;
@@ -204,7 +205,7 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, stru
INIT_LIST_HEAD(&clnt->cl_tasks);
spin_lock_init(&clnt->cl_lock);
- if (!xprt_bound(clnt->cl_xprt))
+ if (!xprt_bound(xprt))
clnt->cl_autobind = 1;
clnt->cl_timeout = xprt->timeout;
@@ -376,6 +377,7 @@ struct rpc_clnt *
rpc_clone_client(struct rpc_clnt *clnt)
{
struct rpc_clnt *new;
+ struct rpc_xprt *xprt;
int err = -ENOMEM;
new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
@@ -395,6 +397,12 @@ rpc_clone_client(struct rpc_clnt *clnt)
if (new->cl_principal == NULL)
goto out_no_principal;
}
+ rcu_read_lock();
+ xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+ rcu_read_unlock();
+ if (xprt == NULL)
+ goto out_no_transport;
+ rcu_assign_pointer(new->cl_xprt, xprt);
atomic_set(&new->cl_count, 1);
atomic_set(&new->cl_active_tasks, 0);
rpc_init_wait_queue(&new->cl_waitqueue, "client waitqueue");
@@ -403,12 +411,13 @@ rpc_clone_client(struct rpc_clnt *clnt)
goto out_no_path;
if (new->cl_auth)
atomic_inc(&new->cl_auth->au_count);
- xprt_get(clnt->cl_xprt);
atomic_inc(&clnt->cl_count);
rpc_register_client(new);
rpciod_up();
return new;
out_no_path:
+ xprt_put(xprt);
+out_no_transport:
kfree(new->cl_principal);
out_no_principal:
rpc_free_iostats(new->cl_metrics);
@@ -493,7 +502,7 @@ out_free:
rpc_free_iostats(clnt->cl_metrics);
kfree(clnt->cl_principal);
clnt->cl_metrics = NULL;
- xprt_put(clnt->cl_xprt);
+ xprt_put(rcu_dereference_raw(clnt->cl_xprt));
rpciod_down();
kfree(clnt);
}
@@ -850,13 +859,18 @@ EXPORT_SYMBOL_GPL(rpc_call_start);
size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
{
size_t bytes;
- struct rpc_xprt *xprt = clnt->cl_xprt;
+ struct rpc_xprt *xprt;
+
+ rcu_read_lock();
+ xprt = rcu_dereference(clnt->cl_xprt);
- bytes = sizeof(xprt->addr);
+ bytes = xprt->addrlen;
if (bytes > bufsize)
bytes = bufsize;
- memcpy(buf, &clnt->cl_xprt->addr, bytes);
- return xprt->addrlen;
+ memcpy(buf, &xprt->addr, bytes);
+ rcu_read_unlock();
+
+ return bytes;
}
EXPORT_SYMBOL_GPL(rpc_peeraddr);
@@ -865,11 +879,16 @@ EXPORT_SYMBOL_GPL(rpc_peeraddr);
* @clnt: RPC client structure
* @format: address format
*
+ * NB: the lifetime of the memory referenced by the returned pointer is
+ * the same as the rpc_xprt itself. As long as the caller uses this
+ * pointer, it must hold the RCU read lock.
*/
const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
enum rpc_display_format_t format)
{
- struct rpc_xprt *xprt = clnt->cl_xprt;
+ struct rpc_xprt *xprt;
+
+ xprt = rcu_dereference(clnt->cl_xprt);
if (xprt->address_strings[format] != NULL)
return xprt->address_strings[format];
@@ -881,14 +900,51 @@ EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
void
rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
{
- struct rpc_xprt *xprt = clnt->cl_xprt;
+ struct rpc_xprt *xprt;
+
+ rcu_read_lock();
+ xprt = rcu_dereference(clnt->cl_xprt);
if (xprt->ops->set_buffer_size)
xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
+ rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(rpc_setbufsize);
-/*
- * Return size of largest payload RPC client can support, in bytes
+/**
+ * rpc_protocol - Get transport protocol number for an RPC client
+ * @clnt: RPC client to query
+ *
+ */
+int rpc_protocol(struct rpc_clnt *clnt)
+{
+ int protocol;
+
+ rcu_read_lock();
+ protocol = rcu_dereference(clnt->cl_xprt)->prot;
+ rcu_read_unlock();
+ return protocol;
+}
+EXPORT_SYMBOL_GPL(rpc_protocol);
+
+/**
+ * rpc_max_reqs - Get the maximum number of outstanding requests
+ * @clnt: RPC client to query
+ *
+ */
+unsigned int rpc_max_reqs(struct rpc_clnt *clnt)
+{
+ unsigned int max_reqs;
+
+ rcu_read_lock();
+ max_reqs = rcu_dereference(clnt->cl_xprt)->max_reqs;
+ rcu_read_unlock();
+ return max_reqs;
+}
+EXPORT_SYMBOL_GPL(rpc_max_reqs);
+
+/**
+ * rpc_max_payload - Get maximum payload size for a transport, in bytes
+ * @clnt: RPC client to query
*
* For stream transports, this is one RPC record fragment (see RFC
* 1831), as we don't support multi-record requests yet. For datagram
@@ -897,7 +953,12 @@ EXPORT_SYMBOL_GPL(rpc_setbufsize);
*/
size_t rpc_max_payload(struct rpc_clnt *clnt)
{
- return clnt->cl_xprt->max_payload;
+ size_t ret;
+
+ rcu_read_lock();
+ ret = rcu_dereference(clnt->cl_xprt)->max_payload;
+ rcu_read_unlock();
+ return ret;
}
EXPORT_SYMBOL_GPL(rpc_max_payload);
@@ -908,8 +969,11 @@ EXPORT_SYMBOL_GPL(rpc_max_payload);
*/
void rpc_force_rebind(struct rpc_clnt *clnt)
{
- if (clnt->cl_autobind)
- xprt_clear_bound(clnt->cl_xprt);
+ if (clnt->cl_autobind) {
+ rcu_read_lock();
+ xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
+ rcu_read_unlock();
+ }
}
EXPORT_SYMBOL_GPL(rpc_force_rebind);
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 63a7a7a..e8d212d 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -16,6 +16,7 @@
#include <linux/namei.h>
#include <linux/fsnotify.h>
#include <linux/kernel.h>
+#include <linux/rcupdate.h>
#include <asm/ioctls.h>
#include <linux/fs.h>
@@ -378,12 +379,14 @@ rpc_show_info(struct seq_file *m, void *v)
{
struct rpc_clnt *clnt = m->private;
+ rcu_read_lock();
seq_printf(m, "RPC server: %s\n", clnt->cl_server);
seq_printf(m, "service: %s (%d) version %d\n", clnt->cl_protname,
clnt->cl_prog, clnt->cl_vers);
seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
+ rcu_read_unlock();
return 0;
}
diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index 8761bf8..848fe90 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -611,9 +611,10 @@ static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbi
static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
{
struct rpc_clnt *parent = clnt->cl_parent;
+ struct rpc_xprt *xprt = rcu_dereference(clnt->cl_xprt);
while (parent != clnt) {
- if (parent->cl_xprt != clnt->cl_xprt)
+ if (rcu_dereference(parent->cl_xprt) != xprt)
break;
if (clnt->cl_autobind)
break;
@@ -644,8 +645,12 @@ void rpcb_getport_async(struct rpc_task *task)
size_t salen;
int status;
- clnt = rpcb_find_transport_owner(task->tk_client);
- xprt = clnt->cl_xprt;
+ rcu_read_lock();
+ do {
+ clnt = rpcb_find_transport_owner(task->tk_client);
+ xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+ } while (xprt == NULL);
+ rcu_read_unlock();
dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
task->tk_pid, __func__,
@@ -658,6 +663,7 @@ void rpcb_getport_async(struct rpc_task *task)
if (xprt_test_and_set_binding(xprt)) {
dprintk("RPC: %5u %s: waiting for another binder\n",
task->tk_pid, __func__);
+ xprt_put(xprt);
return;
}
@@ -725,7 +731,7 @@ void rpcb_getport_async(struct rpc_task *task)
switch (bind_version) {
case RPCBVERS_4:
case RPCBVERS_3:
- map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
+ map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
map->r_owner = "";
break;
@@ -754,6 +760,7 @@ bailout_release_client:
bailout_nofree:
rpcb_wake_rpcbind_waiters(xprt, status);
task->tk_status = status;
+ xprt_put(xprt);
}
EXPORT_SYMBOL_GPL(rpcb_getport_async);
diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 80df89d..4084255 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -22,6 +22,7 @@
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/metrics.h>
+#include <linux/rcupdate.h>
#include "netns.h"
@@ -179,7 +180,7 @@ static void _print_name(struct seq_file *seq, unsigned int op,
void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
{
struct rpc_iostats *stats = clnt->cl_metrics;
- struct rpc_xprt *xprt = clnt->cl_xprt;
+ struct rpc_xprt *xprt;
unsigned int op, maxproc = clnt->cl_maxproc;
if (!stats)
@@ -189,8 +190,11 @@ void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
seq_printf(seq, "p/v: %u/%u (%s)\n",
clnt->cl_prog, clnt->cl_vers, clnt->cl_protname);
+ rcu_read_lock();
+ xprt = rcu_dereference(clnt->cl_xprt);
if (xprt)
xprt->ops->print_stats(xprt, seq);
+ rcu_read_unlock();
seq_printf(seq, "\tper-op statistics\n");
for (op = 0; op < maxproc; op++) {
--
1.7.8.3
--
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