2 * linux/net/sunrpc/clnt.c
4 * This file contains the high-level RPC interface.
5 * It is modeled as a finite state machine to support both synchronous
6 * and asynchronous requests.
8 * - RPC header generation and argument serialization.
9 * - Credential refresh.
10 * - TCP connect handling.
11 * - Retry of operation when it is suspected the operation failed because
12 * of uid squashing on the server, or when the credentials were stale
13 * and need to be refreshed, or when a packet was damaged in transit.
14 * This may be have to be moved to the VFS layer.
16 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
17 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
20 #include <asm/system.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kallsyms.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/slab.h>
29 #include <linux/utsname.h>
30 #include <linux/workqueue.h>
32 #include <linux/in6.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/rpc_pipe_fs.h>
37 #include <linux/sunrpc/metrics.h>
38 #include <linux/sunrpc/bc_xprt.h>
43 # define RPCDBG_FACILITY RPCDBG_CALL
46 #define dprint_status(t) \
47 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
48 __func__, t->tk_status)
51 * All RPC clients are linked into this list
53 static LIST_HEAD(all_clients);
54 static DEFINE_SPINLOCK(rpc_client_lock);
56 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
59 static void call_start(struct rpc_task *task);
60 static void call_reserve(struct rpc_task *task);
61 static void call_reserveresult(struct rpc_task *task);
62 static void call_allocate(struct rpc_task *task);
63 static void call_decode(struct rpc_task *task);
64 static void call_bind(struct rpc_task *task);
65 static void call_bind_status(struct rpc_task *task);
66 static void call_transmit(struct rpc_task *task);
67 #if defined(CONFIG_NFS_V4_1)
68 static void call_bc_transmit(struct rpc_task *task);
69 #endif /* CONFIG_NFS_V4_1 */
70 static void call_status(struct rpc_task *task);
71 static void call_transmit_status(struct rpc_task *task);
72 static void call_refresh(struct rpc_task *task);
73 static void call_refreshresult(struct rpc_task *task);
74 static void call_timeout(struct rpc_task *task);
75 static void call_connect(struct rpc_task *task);
76 static void call_connect_status(struct rpc_task *task);
78 static __be32 *rpc_encode_header(struct rpc_task *task);
79 static __be32 *rpc_verify_header(struct rpc_task *task);
80 static int rpc_ping(struct rpc_clnt *clnt);
82 static void rpc_register_client(struct rpc_clnt *clnt)
84 spin_lock(&rpc_client_lock);
85 list_add(&clnt->cl_clients, &all_clients);
86 spin_unlock(&rpc_client_lock);
89 static void rpc_unregister_client(struct rpc_clnt *clnt)
91 spin_lock(&rpc_client_lock);
92 list_del(&clnt->cl_clients);
93 spin_unlock(&rpc_client_lock);
97 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
99 static uint32_t clntid;
108 clnt->cl_path.mnt = ERR_PTR(-ENOENT);
109 clnt->cl_path.dentry = ERR_PTR(-ENOENT);
110 if (dir_name == NULL)
113 path.mnt = rpc_get_mount();
114 if (IS_ERR(path.mnt))
115 return PTR_ERR(path.mnt);
116 error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd);
121 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
122 name[sizeof(name) - 1] = '\0';
123 q.hash = full_name_hash(q.name, q.len);
124 path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt);
125 if (!IS_ERR(path.dentry))
127 error = PTR_ERR(path.dentry);
128 if (error != -EEXIST) {
129 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
130 " %s/%s, error %d\n",
131 dir_name, name, error);
136 clnt->cl_path = path;
145 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
147 struct rpc_program *program = args->program;
148 struct rpc_version *version;
149 struct rpc_clnt *clnt = NULL;
150 struct rpc_auth *auth;
154 /* sanity check the name before trying to print it */
156 len = strlen(args->servername);
157 if (len > RPC_MAXNETNAMELEN)
161 dprintk("RPC: creating %s client for %s (xprt %p)\n",
162 program->name, args->servername, xprt);
171 if (args->version >= program->nrvers)
173 version = program->version[args->version];
178 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
181 clnt->cl_parent = clnt;
183 clnt->cl_server = clnt->cl_inline_name;
184 if (len > sizeof(clnt->cl_inline_name)) {
185 char *buf = kmalloc(len, GFP_KERNEL);
187 clnt->cl_server = buf;
189 len = sizeof(clnt->cl_inline_name);
191 strlcpy(clnt->cl_server, args->servername, len);
193 clnt->cl_xprt = xprt;
194 clnt->cl_procinfo = version->procs;
195 clnt->cl_maxproc = version->nrprocs;
196 clnt->cl_protname = program->name;
197 clnt->cl_prog = args->prognumber ? : program->number;
198 clnt->cl_vers = version->number;
199 clnt->cl_stats = program->stats;
200 clnt->cl_metrics = rpc_alloc_iostats(clnt);
202 if (clnt->cl_metrics == NULL)
204 clnt->cl_program = program;
205 INIT_LIST_HEAD(&clnt->cl_tasks);
206 spin_lock_init(&clnt->cl_lock);
208 if (!xprt_bound(clnt->cl_xprt))
209 clnt->cl_autobind = 1;
211 clnt->cl_timeout = xprt->timeout;
212 if (args->timeout != NULL) {
213 memcpy(&clnt->cl_timeout_default, args->timeout,
214 sizeof(clnt->cl_timeout_default));
215 clnt->cl_timeout = &clnt->cl_timeout_default;
218 clnt->cl_rtt = &clnt->cl_rtt_default;
219 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
220 clnt->cl_principal = NULL;
221 if (args->client_name) {
222 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
223 if (!clnt->cl_principal)
224 goto out_no_principal;
227 atomic_set(&clnt->cl_count, 1);
229 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
233 auth = rpcauth_create(args->authflavor, clnt);
235 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
241 /* save the nodename */
242 clnt->cl_nodelen = strlen(init_utsname()->nodename);
243 if (clnt->cl_nodelen > UNX_MAXNODENAME)
244 clnt->cl_nodelen = UNX_MAXNODENAME;
245 memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen);
246 rpc_register_client(clnt);
250 if (!IS_ERR(clnt->cl_path.dentry)) {
251 rpc_remove_client_dir(clnt->cl_path.dentry);
255 kfree(clnt->cl_principal);
257 rpc_free_iostats(clnt->cl_metrics);
259 if (clnt->cl_server != clnt->cl_inline_name)
260 kfree(clnt->cl_server);
271 * rpc_create - create an RPC client and transport with one call
272 * @args: rpc_clnt create argument structure
274 * Creates and initializes an RPC transport and an RPC client.
276 * It can ping the server in order to determine if it is up, and to see if
277 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
278 * this behavior so asynchronous tasks can also use rpc_create.
280 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
282 struct rpc_xprt *xprt;
283 struct rpc_clnt *clnt;
284 struct xprt_create xprtargs = {
286 .ident = args->protocol,
287 .srcaddr = args->saddress,
288 .dstaddr = args->address,
289 .addrlen = args->addrsize,
290 .bc_xprt = args->bc_xprt,
295 * If the caller chooses not to specify a hostname, whip
296 * up a string representation of the passed-in address.
298 if (args->servername == NULL) {
299 struct sockaddr_un *sun =
300 (struct sockaddr_un *)args->address;
301 struct sockaddr_in *sin =
302 (struct sockaddr_in *)args->address;
303 struct sockaddr_in6 *sin6 =
304 (struct sockaddr_in6 *)args->address;
306 servername[0] = '\0';
307 switch (args->address->sa_family) {
309 snprintf(servername, sizeof(servername), "%s",
313 snprintf(servername, sizeof(servername), "%pI4",
314 &sin->sin_addr.s_addr);
317 snprintf(servername, sizeof(servername), "%pI6",
321 /* caller wants default server name, but
322 * address family isn't recognized. */
323 return ERR_PTR(-EINVAL);
325 args->servername = servername;
328 xprt = xprt_create_transport(&xprtargs);
330 return (struct rpc_clnt *)xprt;
333 * By default, kernel RPC client connects from a reserved port.
334 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
335 * but it is always enabled for rpciod, which handles the connect
339 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
342 clnt = rpc_new_client(args, xprt);
346 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
347 int err = rpc_ping(clnt);
349 rpc_shutdown_client(clnt);
354 clnt->cl_softrtry = 1;
355 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
356 clnt->cl_softrtry = 0;
358 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
359 clnt->cl_autobind = 1;
360 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
361 clnt->cl_discrtry = 1;
362 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
367 EXPORT_SYMBOL_GPL(rpc_create);
370 * This function clones the RPC client structure. It allows us to share the
371 * same transport while varying parameters such as the authentication
375 rpc_clone_client(struct rpc_clnt *clnt)
377 struct rpc_clnt *new;
380 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
383 new->cl_parent = clnt;
384 /* Turn off autobind on clones */
385 new->cl_autobind = 0;
386 INIT_LIST_HEAD(&new->cl_tasks);
387 spin_lock_init(&new->cl_lock);
388 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
389 new->cl_metrics = rpc_alloc_iostats(clnt);
390 if (new->cl_metrics == NULL)
392 if (clnt->cl_principal) {
393 new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL);
394 if (new->cl_principal == NULL)
395 goto out_no_principal;
397 atomic_set(&new->cl_count, 1);
398 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
402 atomic_inc(&new->cl_auth->au_count);
403 xprt_get(clnt->cl_xprt);
404 atomic_inc(&clnt->cl_count);
405 rpc_register_client(new);
409 kfree(new->cl_principal);
411 rpc_free_iostats(new->cl_metrics);
415 dprintk("RPC: %s: returned error %d\n", __func__, err);
418 EXPORT_SYMBOL_GPL(rpc_clone_client);
421 * Kill all tasks for the given client.
422 * XXX: kill their descendants as well?
424 void rpc_killall_tasks(struct rpc_clnt *clnt)
426 struct rpc_task *rovr;
429 if (list_empty(&clnt->cl_tasks))
431 dprintk("RPC: killing all tasks for client %p\n", clnt);
433 * Spin lock all_tasks to prevent changes...
435 spin_lock(&clnt->cl_lock);
436 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
437 if (!RPC_IS_ACTIVATED(rovr))
439 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
440 rovr->tk_flags |= RPC_TASK_KILLED;
441 rpc_exit(rovr, -EIO);
442 if (RPC_IS_QUEUED(rovr))
443 rpc_wake_up_queued_task(rovr->tk_waitqueue,
447 spin_unlock(&clnt->cl_lock);
449 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
452 * Properly shut down an RPC client, terminating all outstanding
455 void rpc_shutdown_client(struct rpc_clnt *clnt)
457 dprintk("RPC: shutting down %s client for %s\n",
458 clnt->cl_protname, clnt->cl_server);
460 while (!list_empty(&clnt->cl_tasks)) {
461 rpc_killall_tasks(clnt);
462 wait_event_timeout(destroy_wait,
463 list_empty(&clnt->cl_tasks), 1*HZ);
466 rpc_release_client(clnt);
468 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
474 rpc_free_client(struct rpc_clnt *clnt)
476 dprintk("RPC: destroying %s client for %s\n",
477 clnt->cl_protname, clnt->cl_server);
478 if (!IS_ERR(clnt->cl_path.dentry)) {
479 rpc_remove_client_dir(clnt->cl_path.dentry);
482 if (clnt->cl_parent != clnt) {
483 rpc_release_client(clnt->cl_parent);
486 if (clnt->cl_server != clnt->cl_inline_name)
487 kfree(clnt->cl_server);
489 rpc_unregister_client(clnt);
490 rpc_free_iostats(clnt->cl_metrics);
491 kfree(clnt->cl_principal);
492 clnt->cl_metrics = NULL;
493 xprt_put(clnt->cl_xprt);
502 rpc_free_auth(struct rpc_clnt *clnt)
504 if (clnt->cl_auth == NULL) {
505 rpc_free_client(clnt);
510 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
511 * release remaining GSS contexts. This mechanism ensures
512 * that it can do so safely.
514 atomic_inc(&clnt->cl_count);
515 rpcauth_release(clnt->cl_auth);
516 clnt->cl_auth = NULL;
517 if (atomic_dec_and_test(&clnt->cl_count))
518 rpc_free_client(clnt);
522 * Release reference to the RPC client
525 rpc_release_client(struct rpc_clnt *clnt)
527 dprintk("RPC: rpc_release_client(%p)\n", clnt);
529 if (list_empty(&clnt->cl_tasks))
530 wake_up(&destroy_wait);
531 if (atomic_dec_and_test(&clnt->cl_count))
536 * rpc_bind_new_program - bind a new RPC program to an existing client
537 * @old: old rpc_client
538 * @program: rpc program to set
539 * @vers: rpc program version
541 * Clones the rpc client and sets up a new RPC program. This is mainly
542 * of use for enabling different RPC programs to share the same transport.
543 * The Sun NFSv2/v3 ACL protocol can do this.
545 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
546 struct rpc_program *program,
549 struct rpc_clnt *clnt;
550 struct rpc_version *version;
553 BUG_ON(vers >= program->nrvers || !program->version[vers]);
554 version = program->version[vers];
555 clnt = rpc_clone_client(old);
558 clnt->cl_procinfo = version->procs;
559 clnt->cl_maxproc = version->nrprocs;
560 clnt->cl_protname = program->name;
561 clnt->cl_prog = program->number;
562 clnt->cl_vers = version->number;
563 clnt->cl_stats = program->stats;
564 err = rpc_ping(clnt);
566 rpc_shutdown_client(clnt);
572 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
574 void rpc_task_release_client(struct rpc_task *task)
576 struct rpc_clnt *clnt = task->tk_client;
579 /* Remove from client task list */
580 spin_lock(&clnt->cl_lock);
581 list_del(&task->tk_task);
582 spin_unlock(&clnt->cl_lock);
583 task->tk_client = NULL;
585 rpc_release_client(clnt);
590 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
593 rpc_task_release_client(task);
594 task->tk_client = clnt;
595 atomic_inc(&clnt->cl_count);
596 if (clnt->cl_softrtry)
597 task->tk_flags |= RPC_TASK_SOFT;
598 /* Add to the client's list of all tasks */
599 spin_lock(&clnt->cl_lock);
600 list_add_tail(&task->tk_task, &clnt->cl_tasks);
601 spin_unlock(&clnt->cl_lock);
605 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
607 rpc_task_release_client(task);
608 rpc_task_set_client(task, clnt);
610 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
614 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
617 task->tk_msg.rpc_proc = msg->rpc_proc;
618 task->tk_msg.rpc_argp = msg->rpc_argp;
619 task->tk_msg.rpc_resp = msg->rpc_resp;
620 if (msg->rpc_cred != NULL)
621 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
626 * Default callback for async RPC calls
629 rpc_default_callback(struct rpc_task *task, void *data)
633 static const struct rpc_call_ops rpc_default_ops = {
634 .rpc_call_done = rpc_default_callback,
638 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
639 * @task_setup_data: pointer to task initialisation data
641 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
643 struct rpc_task *task;
645 task = rpc_new_task(task_setup_data);
649 rpc_task_set_client(task, task_setup_data->rpc_client);
650 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
652 if (task->tk_action == NULL)
653 rpc_call_start(task);
655 atomic_inc(&task->tk_count);
660 EXPORT_SYMBOL_GPL(rpc_run_task);
663 * rpc_call_sync - Perform a synchronous RPC call
664 * @clnt: pointer to RPC client
665 * @msg: RPC call parameters
666 * @flags: RPC call flags
668 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
670 struct rpc_task *task;
671 struct rpc_task_setup task_setup_data = {
674 .callback_ops = &rpc_default_ops,
679 BUG_ON(flags & RPC_TASK_ASYNC);
681 task = rpc_run_task(&task_setup_data);
683 return PTR_ERR(task);
684 status = task->tk_status;
688 EXPORT_SYMBOL_GPL(rpc_call_sync);
691 * rpc_call_async - Perform an asynchronous RPC call
692 * @clnt: pointer to RPC client
693 * @msg: RPC call parameters
694 * @flags: RPC call flags
695 * @tk_ops: RPC call ops
696 * @data: user call data
699 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
700 const struct rpc_call_ops *tk_ops, void *data)
702 struct rpc_task *task;
703 struct rpc_task_setup task_setup_data = {
706 .callback_ops = tk_ops,
707 .callback_data = data,
708 .flags = flags|RPC_TASK_ASYNC,
711 task = rpc_run_task(&task_setup_data);
713 return PTR_ERR(task);
717 EXPORT_SYMBOL_GPL(rpc_call_async);
719 #if defined(CONFIG_NFS_V4_1)
721 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
722 * rpc_execute against it
724 * @tk_ops: RPC call ops
726 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
727 const struct rpc_call_ops *tk_ops)
729 struct rpc_task *task;
730 struct xdr_buf *xbufp = &req->rq_snd_buf;
731 struct rpc_task_setup task_setup_data = {
732 .callback_ops = tk_ops,
735 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
737 * Create an rpc_task to send the data
739 task = rpc_new_task(&task_setup_data);
741 xprt_free_bc_request(req);
744 task->tk_rqstp = req;
747 * Set up the xdr_buf length.
748 * This also indicates that the buffer is XDR encoded already.
750 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
751 xbufp->tail[0].iov_len;
753 task->tk_action = call_bc_transmit;
754 atomic_inc(&task->tk_count);
755 BUG_ON(atomic_read(&task->tk_count) != 2);
759 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
762 #endif /* CONFIG_NFS_V4_1 */
765 rpc_call_start(struct rpc_task *task)
767 task->tk_action = call_start;
769 EXPORT_SYMBOL_GPL(rpc_call_start);
772 * rpc_peeraddr - extract remote peer address from clnt's xprt
773 * @clnt: RPC client structure
774 * @buf: target buffer
775 * @bufsize: length of target buffer
777 * Returns the number of bytes that are actually in the stored address.
779 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
782 struct rpc_xprt *xprt = clnt->cl_xprt;
784 bytes = sizeof(xprt->addr);
787 memcpy(buf, &clnt->cl_xprt->addr, bytes);
788 return xprt->addrlen;
790 EXPORT_SYMBOL_GPL(rpc_peeraddr);
793 * rpc_peeraddr2str - return remote peer address in printable format
794 * @clnt: RPC client structure
795 * @format: address format
798 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
799 enum rpc_display_format_t format)
801 struct rpc_xprt *xprt = clnt->cl_xprt;
803 if (xprt->address_strings[format] != NULL)
804 return xprt->address_strings[format];
806 return "unprintable";
808 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
811 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
813 struct rpc_xprt *xprt = clnt->cl_xprt;
814 if (xprt->ops->set_buffer_size)
815 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
817 EXPORT_SYMBOL_GPL(rpc_setbufsize);
820 * Return size of largest payload RPC client can support, in bytes
822 * For stream transports, this is one RPC record fragment (see RFC
823 * 1831), as we don't support multi-record requests yet. For datagram
824 * transports, this is the size of an IP packet minus the IP, UDP, and
827 size_t rpc_max_payload(struct rpc_clnt *clnt)
829 return clnt->cl_xprt->max_payload;
831 EXPORT_SYMBOL_GPL(rpc_max_payload);
834 * rpc_force_rebind - force transport to check that remote port is unchanged
835 * @clnt: client to rebind
838 void rpc_force_rebind(struct rpc_clnt *clnt)
840 if (clnt->cl_autobind)
841 xprt_clear_bound(clnt->cl_xprt);
843 EXPORT_SYMBOL_GPL(rpc_force_rebind);
846 * Restart an (async) RPC call from the call_prepare state.
847 * Usually called from within the exit handler.
850 rpc_restart_call_prepare(struct rpc_task *task)
852 if (RPC_ASSASSINATED(task))
854 task->tk_action = rpc_prepare_task;
857 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
860 * Restart an (async) RPC call. Usually called from within the
864 rpc_restart_call(struct rpc_task *task)
866 if (RPC_ASSASSINATED(task))
868 task->tk_action = call_start;
871 EXPORT_SYMBOL_GPL(rpc_restart_call);
874 static const char *rpc_proc_name(const struct rpc_task *task)
876 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
891 * Other FSM states can be visited zero or more times, but
892 * this state is visited exactly once for each RPC.
895 call_start(struct rpc_task *task)
897 struct rpc_clnt *clnt = task->tk_client;
899 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
900 clnt->cl_protname, clnt->cl_vers,
902 (RPC_IS_ASYNC(task) ? "async" : "sync"));
904 /* Increment call count */
905 task->tk_msg.rpc_proc->p_count++;
906 clnt->cl_stats->rpccnt++;
907 task->tk_action = call_reserve;
911 * 1. Reserve an RPC call slot
914 call_reserve(struct rpc_task *task)
919 task->tk_action = call_reserveresult;
924 * 1b. Grok the result of xprt_reserve()
927 call_reserveresult(struct rpc_task *task)
929 int status = task->tk_status;
934 * After a call to xprt_reserve(), we must have either
935 * a request slot or else an error status.
939 if (task->tk_rqstp) {
940 task->tk_action = call_refresh;
944 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
946 rpc_exit(task, -EIO);
951 * Even though there was an error, we may have acquired
952 * a request slot somehow. Make sure not to leak it.
954 if (task->tk_rqstp) {
955 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
961 case -EAGAIN: /* woken up; retry */
962 task->tk_action = call_reserve;
964 case -EIO: /* probably a shutdown */
967 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
971 rpc_exit(task, status);
975 * 2. Bind and/or refresh the credentials
978 call_refresh(struct rpc_task *task)
982 task->tk_action = call_refreshresult;
984 task->tk_client->cl_stats->rpcauthrefresh++;
985 rpcauth_refreshcred(task);
989 * 2a. Process the results of a credential refresh
992 call_refreshresult(struct rpc_task *task)
994 int status = task->tk_status;
999 task->tk_action = call_refresh;
1002 if (rpcauth_uptodatecred(task))
1003 task->tk_action = call_allocate;
1006 rpc_delay(task, 3*HZ);
1009 if (!task->tk_cred_retry)
1011 task->tk_cred_retry--;
1012 dprintk("RPC: %5u %s: retry refresh creds\n",
1013 task->tk_pid, __func__);
1016 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1017 task->tk_pid, __func__, status);
1018 rpc_exit(task, status);
1022 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1023 * (Note: buffer memory is freed in xprt_release).
1026 call_allocate(struct rpc_task *task)
1028 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1029 struct rpc_rqst *req = task->tk_rqstp;
1030 struct rpc_xprt *xprt = task->tk_xprt;
1031 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1033 dprint_status(task);
1035 task->tk_status = 0;
1036 task->tk_action = call_bind;
1041 if (proc->p_proc != 0) {
1042 BUG_ON(proc->p_arglen == 0);
1043 if (proc->p_decode != NULL)
1044 BUG_ON(proc->p_replen == 0);
1048 * Calculate the size (in quads) of the RPC call
1049 * and reply headers, and convert both values
1052 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1053 req->rq_callsize <<= 2;
1054 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1055 req->rq_rcvsize <<= 2;
1057 req->rq_buffer = xprt->ops->buf_alloc(task,
1058 req->rq_callsize + req->rq_rcvsize);
1059 if (req->rq_buffer != NULL)
1062 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1064 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1065 task->tk_action = call_allocate;
1066 rpc_delay(task, HZ>>4);
1070 rpc_exit(task, -ERESTARTSYS);
1074 rpc_task_need_encode(struct rpc_task *task)
1076 return task->tk_rqstp->rq_snd_buf.len == 0;
1080 rpc_task_force_reencode(struct rpc_task *task)
1082 task->tk_rqstp->rq_snd_buf.len = 0;
1083 task->tk_rqstp->rq_bytes_sent = 0;
1087 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1089 buf->head[0].iov_base = start;
1090 buf->head[0].iov_len = len;
1091 buf->tail[0].iov_len = 0;
1099 * 3. Encode arguments of an RPC call
1102 rpc_xdr_encode(struct rpc_task *task)
1104 struct rpc_rqst *req = task->tk_rqstp;
1108 dprint_status(task);
1110 rpc_xdr_buf_init(&req->rq_snd_buf,
1113 rpc_xdr_buf_init(&req->rq_rcv_buf,
1114 (char *)req->rq_buffer + req->rq_callsize,
1117 p = rpc_encode_header(task);
1119 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1120 rpc_exit(task, -EIO);
1124 encode = task->tk_msg.rpc_proc->p_encode;
1128 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1129 task->tk_msg.rpc_argp);
1133 * 4. Get the server port number if not yet set
1136 call_bind(struct rpc_task *task)
1138 struct rpc_xprt *xprt = task->tk_xprt;
1140 dprint_status(task);
1142 task->tk_action = call_connect;
1143 if (!xprt_bound(xprt)) {
1144 task->tk_action = call_bind_status;
1145 task->tk_timeout = xprt->bind_timeout;
1146 xprt->ops->rpcbind(task);
1151 * 4a. Sort out bind result
1154 call_bind_status(struct rpc_task *task)
1158 if (task->tk_status >= 0) {
1159 dprint_status(task);
1160 task->tk_status = 0;
1161 task->tk_action = call_connect;
1165 switch (task->tk_status) {
1167 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1168 rpc_delay(task, HZ >> 2);
1171 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1172 "unavailable\n", task->tk_pid);
1173 /* fail immediately if this is an RPC ping */
1174 if (task->tk_msg.rpc_proc->p_proc == 0) {
1175 status = -EOPNOTSUPP;
1178 if (task->tk_rebind_retry == 0)
1180 task->tk_rebind_retry--;
1181 rpc_delay(task, 3*HZ);
1184 dprintk("RPC: %5u rpcbind request timed out\n",
1188 /* server doesn't support any rpcbind version we know of */
1189 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1192 case -EPROTONOSUPPORT:
1193 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1195 task->tk_status = 0;
1196 task->tk_action = call_bind;
1198 case -ECONNREFUSED: /* connection problems */
1205 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1206 task->tk_pid, task->tk_status);
1207 if (!RPC_IS_SOFTCONN(task)) {
1208 rpc_delay(task, 5*HZ);
1211 status = task->tk_status;
1214 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1215 task->tk_pid, -task->tk_status);
1218 rpc_exit(task, status);
1222 task->tk_action = call_timeout;
1226 * 4b. Connect to the RPC server
1229 call_connect(struct rpc_task *task)
1231 struct rpc_xprt *xprt = task->tk_xprt;
1233 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1235 (xprt_connected(xprt) ? "is" : "is not"));
1237 task->tk_action = call_transmit;
1238 if (!xprt_connected(xprt)) {
1239 task->tk_action = call_connect_status;
1240 if (task->tk_status < 0)
1247 * 4c. Sort out connect result
1250 call_connect_status(struct rpc_task *task)
1252 struct rpc_clnt *clnt = task->tk_client;
1253 int status = task->tk_status;
1255 dprint_status(task);
1257 task->tk_status = 0;
1258 if (status >= 0 || status == -EAGAIN) {
1259 clnt->cl_stats->netreconn++;
1260 task->tk_action = call_transmit;
1265 /* if soft mounted, test if we've timed out */
1267 task->tk_action = call_timeout;
1270 rpc_exit(task, -EIO);
1275 * 5. Transmit the RPC request, and wait for reply
1278 call_transmit(struct rpc_task *task)
1280 dprint_status(task);
1282 task->tk_action = call_status;
1283 if (task->tk_status < 0)
1285 task->tk_status = xprt_prepare_transmit(task);
1286 if (task->tk_status != 0)
1288 task->tk_action = call_transmit_status;
1289 /* Encode here so that rpcsec_gss can use correct sequence number. */
1290 if (rpc_task_need_encode(task)) {
1291 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
1292 rpc_xdr_encode(task);
1293 /* Did the encode result in an error condition? */
1294 if (task->tk_status != 0) {
1295 /* Was the error nonfatal? */
1296 if (task->tk_status == -EAGAIN)
1297 rpc_delay(task, HZ >> 4);
1299 rpc_exit(task, task->tk_status);
1303 xprt_transmit(task);
1304 if (task->tk_status < 0)
1307 * On success, ensure that we call xprt_end_transmit() before sleeping
1308 * in order to allow access to the socket to other RPC requests.
1310 call_transmit_status(task);
1311 if (rpc_reply_expected(task))
1313 task->tk_action = rpc_exit_task;
1314 rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
1318 * 5a. Handle cleanup after a transmission
1321 call_transmit_status(struct rpc_task *task)
1323 task->tk_action = call_status;
1326 * Common case: success. Force the compiler to put this
1329 if (task->tk_status == 0) {
1330 xprt_end_transmit(task);
1331 rpc_task_force_reencode(task);
1335 switch (task->tk_status) {
1339 dprint_status(task);
1340 xprt_end_transmit(task);
1341 rpc_task_force_reencode(task);
1344 * Special cases: if we've been waiting on the
1345 * socket's write_space() callback, or if the
1346 * socket just returned a connection error,
1347 * then hold onto the transport lock.
1353 if (RPC_IS_SOFTCONN(task)) {
1354 xprt_end_transmit(task);
1355 rpc_exit(task, task->tk_status);
1361 rpc_task_force_reencode(task);
1365 #if defined(CONFIG_NFS_V4_1)
1367 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1368 * addition, disconnect on connectivity errors.
1371 call_bc_transmit(struct rpc_task *task)
1373 struct rpc_rqst *req = task->tk_rqstp;
1375 BUG_ON(task->tk_status != 0);
1376 task->tk_status = xprt_prepare_transmit(task);
1377 if (task->tk_status == -EAGAIN) {
1379 * Could not reserve the transport. Try again after the
1380 * transport is released.
1382 task->tk_status = 0;
1383 task->tk_action = call_bc_transmit;
1387 task->tk_action = rpc_exit_task;
1388 if (task->tk_status < 0) {
1389 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1390 "error: %d\n", task->tk_status);
1394 xprt_transmit(task);
1395 xprt_end_transmit(task);
1396 dprint_status(task);
1397 switch (task->tk_status) {
1406 * Problem reaching the server. Disconnect and let the
1407 * forechannel reestablish the connection. The server will
1408 * have to retransmit the backchannel request and we'll
1409 * reprocess it. Since these ops are idempotent, there's no
1410 * need to cache our reply at this time.
1412 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1413 "error: %d\n", task->tk_status);
1414 xprt_conditional_disconnect(task->tk_xprt,
1415 req->rq_connect_cookie);
1419 * We were unable to reply and will have to drop the
1420 * request. The server should reconnect and retransmit.
1422 BUG_ON(task->tk_status == -EAGAIN);
1423 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1424 "error: %d\n", task->tk_status);
1427 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1429 #endif /* CONFIG_NFS_V4_1 */
1432 * 6. Sort out the RPC call status
1435 call_status(struct rpc_task *task)
1437 struct rpc_clnt *clnt = task->tk_client;
1438 struct rpc_rqst *req = task->tk_rqstp;
1441 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1442 task->tk_status = req->rq_reply_bytes_recvd;
1444 dprint_status(task);
1446 status = task->tk_status;
1448 task->tk_action = call_decode;
1452 task->tk_status = 0;
1458 * Delay any retries for 3 seconds, then handle as if it
1461 rpc_delay(task, 3*HZ);
1463 task->tk_action = call_timeout;
1464 if (task->tk_client->cl_discrtry)
1465 xprt_conditional_disconnect(task->tk_xprt,
1466 req->rq_connect_cookie);
1470 rpc_force_rebind(clnt);
1471 rpc_delay(task, 3*HZ);
1474 task->tk_action = call_bind;
1477 task->tk_action = call_transmit;
1480 /* shutdown or soft timeout */
1481 rpc_exit(task, status);
1484 if (clnt->cl_chatty)
1485 printk("%s: RPC call returned error %d\n",
1486 clnt->cl_protname, -status);
1487 rpc_exit(task, status);
1492 * 6a. Handle RPC timeout
1493 * We do not release the request slot, so we keep using the
1494 * same XID for all retransmits.
1497 call_timeout(struct rpc_task *task)
1499 struct rpc_clnt *clnt = task->tk_client;
1501 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1502 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1506 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1507 task->tk_timeouts++;
1509 if (RPC_IS_SOFTCONN(task)) {
1510 rpc_exit(task, -ETIMEDOUT);
1513 if (RPC_IS_SOFT(task)) {
1514 if (clnt->cl_chatty)
1515 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1516 clnt->cl_protname, clnt->cl_server);
1517 if (task->tk_flags & RPC_TASK_TIMEOUT)
1518 rpc_exit(task, -ETIMEDOUT);
1520 rpc_exit(task, -EIO);
1524 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1525 task->tk_flags |= RPC_CALL_MAJORSEEN;
1526 if (clnt->cl_chatty)
1527 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1528 clnt->cl_protname, clnt->cl_server);
1530 rpc_force_rebind(clnt);
1532 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1533 * event? RFC2203 requires the server to drop all such requests.
1535 rpcauth_invalcred(task);
1538 clnt->cl_stats->rpcretrans++;
1539 task->tk_action = call_bind;
1540 task->tk_status = 0;
1544 * 7. Decode the RPC reply
1547 call_decode(struct rpc_task *task)
1549 struct rpc_clnt *clnt = task->tk_client;
1550 struct rpc_rqst *req = task->tk_rqstp;
1551 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1554 dprintk("RPC: %5u call_decode (status %d)\n",
1555 task->tk_pid, task->tk_status);
1557 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1558 if (clnt->cl_chatty)
1559 printk(KERN_NOTICE "%s: server %s OK\n",
1560 clnt->cl_protname, clnt->cl_server);
1561 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1565 * Ensure that we see all writes made by xprt_complete_rqst()
1566 * before it changed req->rq_reply_bytes_recvd.
1569 req->rq_rcv_buf.len = req->rq_private_buf.len;
1571 /* Check that the softirq receive buffer is valid */
1572 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1573 sizeof(req->rq_rcv_buf)) != 0);
1575 if (req->rq_rcv_buf.len < 12) {
1576 if (!RPC_IS_SOFT(task)) {
1577 task->tk_action = call_bind;
1578 clnt->cl_stats->rpcretrans++;
1581 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1582 clnt->cl_protname, task->tk_status);
1583 task->tk_action = call_timeout;
1587 p = rpc_verify_header(task);
1589 if (p == ERR_PTR(-EAGAIN))
1594 task->tk_action = rpc_exit_task;
1597 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1598 task->tk_msg.rpc_resp);
1600 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1604 task->tk_status = 0;
1605 /* Note: rpc_verify_header() may have freed the RPC slot */
1606 if (task->tk_rqstp == req) {
1607 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
1608 if (task->tk_client->cl_discrtry)
1609 xprt_conditional_disconnect(task->tk_xprt,
1610 req->rq_connect_cookie);
1615 rpc_encode_header(struct rpc_task *task)
1617 struct rpc_clnt *clnt = task->tk_client;
1618 struct rpc_rqst *req = task->tk_rqstp;
1619 __be32 *p = req->rq_svec[0].iov_base;
1621 /* FIXME: check buffer size? */
1623 p = xprt_skip_transport_header(task->tk_xprt, p);
1624 *p++ = req->rq_xid; /* XID */
1625 *p++ = htonl(RPC_CALL); /* CALL */
1626 *p++ = htonl(RPC_VERSION); /* RPC version */
1627 *p++ = htonl(clnt->cl_prog); /* program number */
1628 *p++ = htonl(clnt->cl_vers); /* program version */
1629 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
1630 p = rpcauth_marshcred(task, p);
1631 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1636 rpc_verify_header(struct rpc_task *task)
1638 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1639 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1640 __be32 *p = iov->iov_base;
1642 int error = -EACCES;
1644 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
1645 /* RFC-1014 says that the representation of XDR data must be a
1646 * multiple of four bytes
1647 * - if it isn't pointer subtraction in the NFS client may give
1650 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1651 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
1652 task->tk_rqstp->rq_rcv_buf.len);
1658 p += 1; /* skip XID */
1659 if ((n = ntohl(*p++)) != RPC_REPLY) {
1660 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1661 task->tk_pid, __func__, n);
1665 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1668 switch ((n = ntohl(*p++))) {
1669 case RPC_AUTH_ERROR:
1672 dprintk("RPC: %5u %s: RPC call version "
1674 task->tk_pid, __func__);
1675 error = -EPROTONOSUPPORT;
1678 dprintk("RPC: %5u %s: RPC call rejected, "
1679 "unknown error: %x\n",
1680 task->tk_pid, __func__, n);
1685 switch ((n = ntohl(*p++))) {
1686 case RPC_AUTH_REJECTEDCRED:
1687 case RPC_AUTH_REJECTEDVERF:
1688 case RPCSEC_GSS_CREDPROBLEM:
1689 case RPCSEC_GSS_CTXPROBLEM:
1690 if (!task->tk_cred_retry)
1692 task->tk_cred_retry--;
1693 dprintk("RPC: %5u %s: retry stale creds\n",
1694 task->tk_pid, __func__);
1695 rpcauth_invalcred(task);
1696 /* Ensure we obtain a new XID! */
1698 task->tk_action = call_reserve;
1700 case RPC_AUTH_BADCRED:
1701 case RPC_AUTH_BADVERF:
1702 /* possibly garbled cred/verf? */
1703 if (!task->tk_garb_retry)
1705 task->tk_garb_retry--;
1706 dprintk("RPC: %5u %s: retry garbled creds\n",
1707 task->tk_pid, __func__);
1708 task->tk_action = call_bind;
1710 case RPC_AUTH_TOOWEAK:
1711 printk(KERN_NOTICE "RPC: server %s requires stronger "
1712 "authentication.\n", task->tk_client->cl_server);
1715 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1716 task->tk_pid, __func__, n);
1719 dprintk("RPC: %5u %s: call rejected %d\n",
1720 task->tk_pid, __func__, n);
1723 if (!(p = rpcauth_checkverf(task, p))) {
1724 dprintk("RPC: %5u %s: auth check failed\n",
1725 task->tk_pid, __func__);
1726 goto out_garbage; /* bad verifier, retry */
1728 len = p - (__be32 *)iov->iov_base - 1;
1731 switch ((n = ntohl(*p++))) {
1734 case RPC_PROG_UNAVAIL:
1735 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1736 task->tk_pid, __func__,
1737 (unsigned int)task->tk_client->cl_prog,
1738 task->tk_client->cl_server);
1739 error = -EPFNOSUPPORT;
1741 case RPC_PROG_MISMATCH:
1742 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1743 "server %s\n", task->tk_pid, __func__,
1744 (unsigned int)task->tk_client->cl_prog,
1745 (unsigned int)task->tk_client->cl_vers,
1746 task->tk_client->cl_server);
1747 error = -EPROTONOSUPPORT;
1749 case RPC_PROC_UNAVAIL:
1750 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1751 "version %u on server %s\n",
1752 task->tk_pid, __func__,
1753 rpc_proc_name(task),
1754 task->tk_client->cl_prog,
1755 task->tk_client->cl_vers,
1756 task->tk_client->cl_server);
1757 error = -EOPNOTSUPP;
1759 case RPC_GARBAGE_ARGS:
1760 dprintk("RPC: %5u %s: server saw garbage\n",
1761 task->tk_pid, __func__);
1764 dprintk("RPC: %5u %s: server accept status: %x\n",
1765 task->tk_pid, __func__, n);
1770 task->tk_client->cl_stats->rpcgarbage++;
1771 if (task->tk_garb_retry) {
1772 task->tk_garb_retry--;
1773 dprintk("RPC: %5u %s: retrying\n",
1774 task->tk_pid, __func__);
1775 task->tk_action = call_bind;
1777 return ERR_PTR(-EAGAIN);
1782 rpc_exit(task, error);
1783 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
1785 return ERR_PTR(error);
1787 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
1792 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
1796 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
1801 static struct rpc_procinfo rpcproc_null = {
1802 .p_encode = rpcproc_encode_null,
1803 .p_decode = rpcproc_decode_null,
1806 static int rpc_ping(struct rpc_clnt *clnt)
1808 struct rpc_message msg = {
1809 .rpc_proc = &rpcproc_null,
1812 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1813 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
1814 put_rpccred(msg.rpc_cred);
1818 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
1820 struct rpc_message msg = {
1821 .rpc_proc = &rpcproc_null,
1824 struct rpc_task_setup task_setup_data = {
1826 .rpc_message = &msg,
1827 .callback_ops = &rpc_default_ops,
1830 return rpc_run_task(&task_setup_data);
1832 EXPORT_SYMBOL_GPL(rpc_call_null);
1835 static void rpc_show_header(void)
1837 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
1838 "-timeout ---ops--\n");
1841 static void rpc_show_task(const struct rpc_clnt *clnt,
1842 const struct rpc_task *task)
1844 const char *rpc_waitq = "none";
1846 if (RPC_IS_QUEUED(task))
1847 rpc_waitq = rpc_qname(task->tk_waitqueue);
1849 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
1850 task->tk_pid, task->tk_flags, task->tk_status,
1851 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
1852 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
1853 task->tk_action, rpc_waitq);
1856 void rpc_show_tasks(void)
1858 struct rpc_clnt *clnt;
1859 struct rpc_task *task;
1862 spin_lock(&rpc_client_lock);
1863 list_for_each_entry(clnt, &all_clients, cl_clients) {
1864 spin_lock(&clnt->cl_lock);
1865 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
1870 rpc_show_task(clnt, task);
1872 spin_unlock(&clnt->cl_lock);
1874 spin_unlock(&rpc_client_lock);