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>
44 # define RPCDBG_FACILITY RPCDBG_CALL
47 #define dprint_status(t) \
48 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
49 __func__, t->tk_status)
52 * All RPC clients are linked into this list
55 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
58 static void call_start(struct rpc_task *task);
59 static void call_reserve(struct rpc_task *task);
60 static void call_reserveresult(struct rpc_task *task);
61 static void call_allocate(struct rpc_task *task);
62 static void call_decode(struct rpc_task *task);
63 static void call_bind(struct rpc_task *task);
64 static void call_bind_status(struct rpc_task *task);
65 static void call_transmit(struct rpc_task *task);
66 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
67 static void call_bc_transmit(struct rpc_task *task);
68 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
69 static void call_status(struct rpc_task *task);
70 static void call_transmit_status(struct rpc_task *task);
71 static void call_refresh(struct rpc_task *task);
72 static void call_refreshresult(struct rpc_task *task);
73 static void call_timeout(struct rpc_task *task);
74 static void call_connect(struct rpc_task *task);
75 static void call_connect_status(struct rpc_task *task);
77 static __be32 *rpc_encode_header(struct rpc_task *task);
78 static __be32 *rpc_verify_header(struct rpc_task *task);
79 static int rpc_ping(struct rpc_clnt *clnt);
81 static void rpc_register_client(struct rpc_clnt *clnt)
83 struct sunrpc_net *sn = net_generic(clnt->cl_xprt->xprt_net, sunrpc_net_id);
85 spin_lock(&sn->rpc_client_lock);
86 list_add(&clnt->cl_clients, &sn->all_clients);
87 spin_unlock(&sn->rpc_client_lock);
90 static void rpc_unregister_client(struct rpc_clnt *clnt)
92 struct sunrpc_net *sn = net_generic(clnt->cl_xprt->xprt_net, sunrpc_net_id);
94 spin_lock(&sn->rpc_client_lock);
95 list_del(&clnt->cl_clients);
96 spin_unlock(&sn->rpc_client_lock);
99 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
101 if (clnt->cl_path.dentry)
102 rpc_remove_client_dir(clnt->cl_path.dentry);
103 clnt->cl_path.dentry = NULL;
106 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
108 struct super_block *pipefs_sb;
111 pipefs_sb = rpc_get_sb_net(clnt->cl_xprt->xprt_net);
113 if (clnt->cl_path.dentry)
115 __rpc_clnt_remove_pipedir(clnt);
116 rpc_put_sb_net(clnt->cl_xprt->xprt_net);
122 static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
123 struct rpc_clnt *clnt, char *dir_name)
125 static uint32_t clntid;
130 struct dentry *dir, *dentry;
133 dir = rpc_d_lookup_sb(sb, dir_name);
137 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
138 name[sizeof(name) - 1] = '\0';
139 q.hash = full_name_hash(q.name, q.len);
140 dentry = rpc_create_client_dir(dir, &q, clnt);
143 error = PTR_ERR(dentry);
144 if (error != -EEXIST) {
145 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
146 " %s/%s, error %d\n",
147 dir_name, name, error);
156 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
158 struct super_block *pipefs_sb;
161 clnt->cl_path.mnt = ERR_PTR(-ENOENT);
162 clnt->cl_path.dentry = NULL;
163 if (dir_name == NULL)
166 path.mnt = rpc_get_mount();
167 if (IS_ERR(path.mnt))
168 return PTR_ERR(path.mnt);
169 pipefs_sb = rpc_get_sb_net(clnt->cl_xprt->xprt_net);
174 path.dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name);
175 rpc_put_sb_net(clnt->cl_xprt->xprt_net);
176 if (IS_ERR(path.dentry)) {
178 return PTR_ERR(path.dentry);
180 clnt->cl_path = path;
184 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
186 struct rpc_program *program = args->program;
187 struct rpc_version *version;
188 struct rpc_clnt *clnt = NULL;
189 struct rpc_auth *auth;
193 /* sanity check the name before trying to print it */
195 len = strlen(args->servername);
196 if (len > RPC_MAXNETNAMELEN)
200 dprintk("RPC: creating %s client for %s (xprt %p)\n",
201 program->name, args->servername, xprt);
210 if (args->version >= program->nrvers)
212 version = program->version[args->version];
217 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
220 clnt->cl_parent = clnt;
222 clnt->cl_server = clnt->cl_inline_name;
223 if (len > sizeof(clnt->cl_inline_name)) {
224 char *buf = kmalloc(len, GFP_KERNEL);
226 clnt->cl_server = buf;
228 len = sizeof(clnt->cl_inline_name);
230 strlcpy(clnt->cl_server, args->servername, len);
232 clnt->cl_xprt = xprt;
233 clnt->cl_procinfo = version->procs;
234 clnt->cl_maxproc = version->nrprocs;
235 clnt->cl_protname = program->name;
236 clnt->cl_prog = args->prognumber ? : program->number;
237 clnt->cl_vers = version->number;
238 clnt->cl_stats = program->stats;
239 clnt->cl_metrics = rpc_alloc_iostats(clnt);
241 if (clnt->cl_metrics == NULL)
243 clnt->cl_program = program;
244 INIT_LIST_HEAD(&clnt->cl_tasks);
245 spin_lock_init(&clnt->cl_lock);
247 if (!xprt_bound(clnt->cl_xprt))
248 clnt->cl_autobind = 1;
250 clnt->cl_timeout = xprt->timeout;
251 if (args->timeout != NULL) {
252 memcpy(&clnt->cl_timeout_default, args->timeout,
253 sizeof(clnt->cl_timeout_default));
254 clnt->cl_timeout = &clnt->cl_timeout_default;
257 clnt->cl_rtt = &clnt->cl_rtt_default;
258 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
259 clnt->cl_principal = NULL;
260 if (args->client_name) {
261 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
262 if (!clnt->cl_principal)
263 goto out_no_principal;
266 atomic_set(&clnt->cl_count, 1);
268 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
272 auth = rpcauth_create(args->authflavor, clnt);
274 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
280 /* save the nodename */
281 clnt->cl_nodelen = strlen(init_utsname()->nodename);
282 if (clnt->cl_nodelen > UNX_MAXNODENAME)
283 clnt->cl_nodelen = UNX_MAXNODENAME;
284 memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen);
285 rpc_register_client(clnt);
289 rpc_clnt_remove_pipedir(clnt);
291 kfree(clnt->cl_principal);
293 rpc_free_iostats(clnt->cl_metrics);
295 if (clnt->cl_server != clnt->cl_inline_name)
296 kfree(clnt->cl_server);
307 * rpc_create - create an RPC client and transport with one call
308 * @args: rpc_clnt create argument structure
310 * Creates and initializes an RPC transport and an RPC client.
312 * It can ping the server in order to determine if it is up, and to see if
313 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
314 * this behavior so asynchronous tasks can also use rpc_create.
316 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
318 struct rpc_xprt *xprt;
319 struct rpc_clnt *clnt;
320 struct xprt_create xprtargs = {
322 .ident = args->protocol,
323 .srcaddr = args->saddress,
324 .dstaddr = args->address,
325 .addrlen = args->addrsize,
326 .bc_xprt = args->bc_xprt,
331 * If the caller chooses not to specify a hostname, whip
332 * up a string representation of the passed-in address.
334 if (args->servername == NULL) {
335 struct sockaddr_un *sun =
336 (struct sockaddr_un *)args->address;
337 struct sockaddr_in *sin =
338 (struct sockaddr_in *)args->address;
339 struct sockaddr_in6 *sin6 =
340 (struct sockaddr_in6 *)args->address;
342 servername[0] = '\0';
343 switch (args->address->sa_family) {
345 snprintf(servername, sizeof(servername), "%s",
349 snprintf(servername, sizeof(servername), "%pI4",
350 &sin->sin_addr.s_addr);
353 snprintf(servername, sizeof(servername), "%pI6",
357 /* caller wants default server name, but
358 * address family isn't recognized. */
359 return ERR_PTR(-EINVAL);
361 args->servername = servername;
364 xprt = xprt_create_transport(&xprtargs);
366 return (struct rpc_clnt *)xprt;
369 * By default, kernel RPC client connects from a reserved port.
370 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
371 * but it is always enabled for rpciod, which handles the connect
375 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
378 clnt = rpc_new_client(args, xprt);
382 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
383 int err = rpc_ping(clnt);
385 rpc_shutdown_client(clnt);
390 clnt->cl_softrtry = 1;
391 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
392 clnt->cl_softrtry = 0;
394 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
395 clnt->cl_autobind = 1;
396 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
397 clnt->cl_discrtry = 1;
398 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
403 EXPORT_SYMBOL_GPL(rpc_create);
406 * This function clones the RPC client structure. It allows us to share the
407 * same transport while varying parameters such as the authentication
411 rpc_clone_client(struct rpc_clnt *clnt)
413 struct rpc_clnt *new;
416 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
419 new->cl_parent = clnt;
420 /* Turn off autobind on clones */
421 new->cl_autobind = 0;
422 INIT_LIST_HEAD(&new->cl_tasks);
423 spin_lock_init(&new->cl_lock);
424 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
425 new->cl_metrics = rpc_alloc_iostats(clnt);
426 if (new->cl_metrics == NULL)
428 if (clnt->cl_principal) {
429 new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL);
430 if (new->cl_principal == NULL)
431 goto out_no_principal;
433 atomic_set(&new->cl_count, 1);
434 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
438 atomic_inc(&new->cl_auth->au_count);
439 xprt_get(clnt->cl_xprt);
440 atomic_inc(&clnt->cl_count);
441 rpc_register_client(new);
445 kfree(new->cl_principal);
447 rpc_free_iostats(new->cl_metrics);
451 dprintk("RPC: %s: returned error %d\n", __func__, err);
454 EXPORT_SYMBOL_GPL(rpc_clone_client);
457 * Kill all tasks for the given client.
458 * XXX: kill their descendants as well?
460 void rpc_killall_tasks(struct rpc_clnt *clnt)
462 struct rpc_task *rovr;
465 if (list_empty(&clnt->cl_tasks))
467 dprintk("RPC: killing all tasks for client %p\n", clnt);
469 * Spin lock all_tasks to prevent changes...
471 spin_lock(&clnt->cl_lock);
472 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
473 if (!RPC_IS_ACTIVATED(rovr))
475 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
476 rovr->tk_flags |= RPC_TASK_KILLED;
477 rpc_exit(rovr, -EIO);
478 if (RPC_IS_QUEUED(rovr))
479 rpc_wake_up_queued_task(rovr->tk_waitqueue,
483 spin_unlock(&clnt->cl_lock);
485 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
488 * Properly shut down an RPC client, terminating all outstanding
491 void rpc_shutdown_client(struct rpc_clnt *clnt)
493 dprintk("RPC: shutting down %s client for %s\n",
494 clnt->cl_protname, clnt->cl_server);
496 while (!list_empty(&clnt->cl_tasks)) {
497 rpc_killall_tasks(clnt);
498 wait_event_timeout(destroy_wait,
499 list_empty(&clnt->cl_tasks), 1*HZ);
502 rpc_release_client(clnt);
504 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
510 rpc_free_client(struct rpc_clnt *clnt)
512 dprintk("RPC: destroying %s client for %s\n",
513 clnt->cl_protname, clnt->cl_server);
514 rpc_clnt_remove_pipedir(clnt);
515 if (clnt->cl_parent != clnt) {
516 rpc_release_client(clnt->cl_parent);
519 if (clnt->cl_server != clnt->cl_inline_name)
520 kfree(clnt->cl_server);
522 rpc_unregister_client(clnt);
523 rpc_free_iostats(clnt->cl_metrics);
524 kfree(clnt->cl_principal);
525 clnt->cl_metrics = NULL;
526 xprt_put(clnt->cl_xprt);
535 rpc_free_auth(struct rpc_clnt *clnt)
537 if (clnt->cl_auth == NULL) {
538 rpc_free_client(clnt);
543 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
544 * release remaining GSS contexts. This mechanism ensures
545 * that it can do so safely.
547 atomic_inc(&clnt->cl_count);
548 rpcauth_release(clnt->cl_auth);
549 clnt->cl_auth = NULL;
550 if (atomic_dec_and_test(&clnt->cl_count))
551 rpc_free_client(clnt);
555 * Release reference to the RPC client
558 rpc_release_client(struct rpc_clnt *clnt)
560 dprintk("RPC: rpc_release_client(%p)\n", clnt);
562 if (list_empty(&clnt->cl_tasks))
563 wake_up(&destroy_wait);
564 if (atomic_dec_and_test(&clnt->cl_count))
569 * rpc_bind_new_program - bind a new RPC program to an existing client
570 * @old: old rpc_client
571 * @program: rpc program to set
572 * @vers: rpc program version
574 * Clones the rpc client and sets up a new RPC program. This is mainly
575 * of use for enabling different RPC programs to share the same transport.
576 * The Sun NFSv2/v3 ACL protocol can do this.
578 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
579 struct rpc_program *program,
582 struct rpc_clnt *clnt;
583 struct rpc_version *version;
586 BUG_ON(vers >= program->nrvers || !program->version[vers]);
587 version = program->version[vers];
588 clnt = rpc_clone_client(old);
591 clnt->cl_procinfo = version->procs;
592 clnt->cl_maxproc = version->nrprocs;
593 clnt->cl_protname = program->name;
594 clnt->cl_prog = program->number;
595 clnt->cl_vers = version->number;
596 clnt->cl_stats = program->stats;
597 err = rpc_ping(clnt);
599 rpc_shutdown_client(clnt);
605 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
607 void rpc_task_release_client(struct rpc_task *task)
609 struct rpc_clnt *clnt = task->tk_client;
612 /* Remove from client task list */
613 spin_lock(&clnt->cl_lock);
614 list_del(&task->tk_task);
615 spin_unlock(&clnt->cl_lock);
616 task->tk_client = NULL;
618 rpc_release_client(clnt);
623 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
626 rpc_task_release_client(task);
627 task->tk_client = clnt;
628 atomic_inc(&clnt->cl_count);
629 if (clnt->cl_softrtry)
630 task->tk_flags |= RPC_TASK_SOFT;
631 /* Add to the client's list of all tasks */
632 spin_lock(&clnt->cl_lock);
633 list_add_tail(&task->tk_task, &clnt->cl_tasks);
634 spin_unlock(&clnt->cl_lock);
638 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
640 rpc_task_release_client(task);
641 rpc_task_set_client(task, clnt);
643 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
647 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
650 task->tk_msg.rpc_proc = msg->rpc_proc;
651 task->tk_msg.rpc_argp = msg->rpc_argp;
652 task->tk_msg.rpc_resp = msg->rpc_resp;
653 if (msg->rpc_cred != NULL)
654 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
659 * Default callback for async RPC calls
662 rpc_default_callback(struct rpc_task *task, void *data)
666 static const struct rpc_call_ops rpc_default_ops = {
667 .rpc_call_done = rpc_default_callback,
671 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
672 * @task_setup_data: pointer to task initialisation data
674 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
676 struct rpc_task *task;
678 task = rpc_new_task(task_setup_data);
682 rpc_task_set_client(task, task_setup_data->rpc_client);
683 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
685 if (task->tk_action == NULL)
686 rpc_call_start(task);
688 atomic_inc(&task->tk_count);
693 EXPORT_SYMBOL_GPL(rpc_run_task);
696 * rpc_call_sync - Perform a synchronous RPC call
697 * @clnt: pointer to RPC client
698 * @msg: RPC call parameters
699 * @flags: RPC call flags
701 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
703 struct rpc_task *task;
704 struct rpc_task_setup task_setup_data = {
707 .callback_ops = &rpc_default_ops,
712 BUG_ON(flags & RPC_TASK_ASYNC);
714 task = rpc_run_task(&task_setup_data);
716 return PTR_ERR(task);
717 status = task->tk_status;
721 EXPORT_SYMBOL_GPL(rpc_call_sync);
724 * rpc_call_async - Perform an asynchronous RPC call
725 * @clnt: pointer to RPC client
726 * @msg: RPC call parameters
727 * @flags: RPC call flags
728 * @tk_ops: RPC call ops
729 * @data: user call data
732 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
733 const struct rpc_call_ops *tk_ops, void *data)
735 struct rpc_task *task;
736 struct rpc_task_setup task_setup_data = {
739 .callback_ops = tk_ops,
740 .callback_data = data,
741 .flags = flags|RPC_TASK_ASYNC,
744 task = rpc_run_task(&task_setup_data);
746 return PTR_ERR(task);
750 EXPORT_SYMBOL_GPL(rpc_call_async);
752 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
754 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
755 * rpc_execute against it
757 * @tk_ops: RPC call ops
759 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
760 const struct rpc_call_ops *tk_ops)
762 struct rpc_task *task;
763 struct xdr_buf *xbufp = &req->rq_snd_buf;
764 struct rpc_task_setup task_setup_data = {
765 .callback_ops = tk_ops,
768 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
770 * Create an rpc_task to send the data
772 task = rpc_new_task(&task_setup_data);
774 xprt_free_bc_request(req);
777 task->tk_rqstp = req;
780 * Set up the xdr_buf length.
781 * This also indicates that the buffer is XDR encoded already.
783 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
784 xbufp->tail[0].iov_len;
786 task->tk_action = call_bc_transmit;
787 atomic_inc(&task->tk_count);
788 BUG_ON(atomic_read(&task->tk_count) != 2);
792 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
795 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
798 rpc_call_start(struct rpc_task *task)
800 task->tk_action = call_start;
802 EXPORT_SYMBOL_GPL(rpc_call_start);
805 * rpc_peeraddr - extract remote peer address from clnt's xprt
806 * @clnt: RPC client structure
807 * @buf: target buffer
808 * @bufsize: length of target buffer
810 * Returns the number of bytes that are actually in the stored address.
812 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
815 struct rpc_xprt *xprt = clnt->cl_xprt;
817 bytes = sizeof(xprt->addr);
820 memcpy(buf, &clnt->cl_xprt->addr, bytes);
821 return xprt->addrlen;
823 EXPORT_SYMBOL_GPL(rpc_peeraddr);
826 * rpc_peeraddr2str - return remote peer address in printable format
827 * @clnt: RPC client structure
828 * @format: address format
831 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
832 enum rpc_display_format_t format)
834 struct rpc_xprt *xprt = clnt->cl_xprt;
836 if (xprt->address_strings[format] != NULL)
837 return xprt->address_strings[format];
839 return "unprintable";
841 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
844 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
846 struct rpc_xprt *xprt = clnt->cl_xprt;
847 if (xprt->ops->set_buffer_size)
848 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
850 EXPORT_SYMBOL_GPL(rpc_setbufsize);
853 * Return size of largest payload RPC client can support, in bytes
855 * For stream transports, this is one RPC record fragment (see RFC
856 * 1831), as we don't support multi-record requests yet. For datagram
857 * transports, this is the size of an IP packet minus the IP, UDP, and
860 size_t rpc_max_payload(struct rpc_clnt *clnt)
862 return clnt->cl_xprt->max_payload;
864 EXPORT_SYMBOL_GPL(rpc_max_payload);
867 * rpc_force_rebind - force transport to check that remote port is unchanged
868 * @clnt: client to rebind
871 void rpc_force_rebind(struct rpc_clnt *clnt)
873 if (clnt->cl_autobind)
874 xprt_clear_bound(clnt->cl_xprt);
876 EXPORT_SYMBOL_GPL(rpc_force_rebind);
879 * Restart an (async) RPC call from the call_prepare state.
880 * Usually called from within the exit handler.
883 rpc_restart_call_prepare(struct rpc_task *task)
885 if (RPC_ASSASSINATED(task))
887 task->tk_action = call_start;
888 if (task->tk_ops->rpc_call_prepare != NULL)
889 task->tk_action = rpc_prepare_task;
892 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
895 * Restart an (async) RPC call. Usually called from within the
899 rpc_restart_call(struct rpc_task *task)
901 if (RPC_ASSASSINATED(task))
903 task->tk_action = call_start;
906 EXPORT_SYMBOL_GPL(rpc_restart_call);
909 static const char *rpc_proc_name(const struct rpc_task *task)
911 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
926 * Other FSM states can be visited zero or more times, but
927 * this state is visited exactly once for each RPC.
930 call_start(struct rpc_task *task)
932 struct rpc_clnt *clnt = task->tk_client;
934 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
935 clnt->cl_protname, clnt->cl_vers,
937 (RPC_IS_ASYNC(task) ? "async" : "sync"));
939 /* Increment call count */
940 task->tk_msg.rpc_proc->p_count++;
941 clnt->cl_stats->rpccnt++;
942 task->tk_action = call_reserve;
946 * 1. Reserve an RPC call slot
949 call_reserve(struct rpc_task *task)
954 task->tk_action = call_reserveresult;
959 * 1b. Grok the result of xprt_reserve()
962 call_reserveresult(struct rpc_task *task)
964 int status = task->tk_status;
969 * After a call to xprt_reserve(), we must have either
970 * a request slot or else an error status.
974 if (task->tk_rqstp) {
975 task->tk_action = call_refresh;
979 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
981 rpc_exit(task, -EIO);
986 * Even though there was an error, we may have acquired
987 * a request slot somehow. Make sure not to leak it.
989 if (task->tk_rqstp) {
990 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
996 case -EAGAIN: /* woken up; retry */
997 task->tk_action = call_reserve;
999 case -EIO: /* probably a shutdown */
1002 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1006 rpc_exit(task, status);
1010 * 2. Bind and/or refresh the credentials
1013 call_refresh(struct rpc_task *task)
1015 dprint_status(task);
1017 task->tk_action = call_refreshresult;
1018 task->tk_status = 0;
1019 task->tk_client->cl_stats->rpcauthrefresh++;
1020 rpcauth_refreshcred(task);
1024 * 2a. Process the results of a credential refresh
1027 call_refreshresult(struct rpc_task *task)
1029 int status = task->tk_status;
1031 dprint_status(task);
1033 task->tk_status = 0;
1034 task->tk_action = call_refresh;
1037 if (rpcauth_uptodatecred(task))
1038 task->tk_action = call_allocate;
1041 rpc_delay(task, 3*HZ);
1044 if (!task->tk_cred_retry)
1046 task->tk_cred_retry--;
1047 dprintk("RPC: %5u %s: retry refresh creds\n",
1048 task->tk_pid, __func__);
1051 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1052 task->tk_pid, __func__, status);
1053 rpc_exit(task, status);
1057 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1058 * (Note: buffer memory is freed in xprt_release).
1061 call_allocate(struct rpc_task *task)
1063 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1064 struct rpc_rqst *req = task->tk_rqstp;
1065 struct rpc_xprt *xprt = task->tk_xprt;
1066 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1068 dprint_status(task);
1070 task->tk_status = 0;
1071 task->tk_action = call_bind;
1076 if (proc->p_proc != 0) {
1077 BUG_ON(proc->p_arglen == 0);
1078 if (proc->p_decode != NULL)
1079 BUG_ON(proc->p_replen == 0);
1083 * Calculate the size (in quads) of the RPC call
1084 * and reply headers, and convert both values
1087 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1088 req->rq_callsize <<= 2;
1089 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1090 req->rq_rcvsize <<= 2;
1092 req->rq_buffer = xprt->ops->buf_alloc(task,
1093 req->rq_callsize + req->rq_rcvsize);
1094 if (req->rq_buffer != NULL)
1097 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1099 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1100 task->tk_action = call_allocate;
1101 rpc_delay(task, HZ>>4);
1105 rpc_exit(task, -ERESTARTSYS);
1109 rpc_task_need_encode(struct rpc_task *task)
1111 return task->tk_rqstp->rq_snd_buf.len == 0;
1115 rpc_task_force_reencode(struct rpc_task *task)
1117 task->tk_rqstp->rq_snd_buf.len = 0;
1118 task->tk_rqstp->rq_bytes_sent = 0;
1122 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1124 buf->head[0].iov_base = start;
1125 buf->head[0].iov_len = len;
1126 buf->tail[0].iov_len = 0;
1134 * 3. Encode arguments of an RPC call
1137 rpc_xdr_encode(struct rpc_task *task)
1139 struct rpc_rqst *req = task->tk_rqstp;
1143 dprint_status(task);
1145 rpc_xdr_buf_init(&req->rq_snd_buf,
1148 rpc_xdr_buf_init(&req->rq_rcv_buf,
1149 (char *)req->rq_buffer + req->rq_callsize,
1152 p = rpc_encode_header(task);
1154 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1155 rpc_exit(task, -EIO);
1159 encode = task->tk_msg.rpc_proc->p_encode;
1163 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1164 task->tk_msg.rpc_argp);
1168 * 4. Get the server port number if not yet set
1171 call_bind(struct rpc_task *task)
1173 struct rpc_xprt *xprt = task->tk_xprt;
1175 dprint_status(task);
1177 task->tk_action = call_connect;
1178 if (!xprt_bound(xprt)) {
1179 task->tk_action = call_bind_status;
1180 task->tk_timeout = xprt->bind_timeout;
1181 xprt->ops->rpcbind(task);
1186 * 4a. Sort out bind result
1189 call_bind_status(struct rpc_task *task)
1193 if (task->tk_status >= 0) {
1194 dprint_status(task);
1195 task->tk_status = 0;
1196 task->tk_action = call_connect;
1200 switch (task->tk_status) {
1202 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1203 rpc_delay(task, HZ >> 2);
1206 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1207 "unavailable\n", task->tk_pid);
1208 /* fail immediately if this is an RPC ping */
1209 if (task->tk_msg.rpc_proc->p_proc == 0) {
1210 status = -EOPNOTSUPP;
1213 if (task->tk_rebind_retry == 0)
1215 task->tk_rebind_retry--;
1216 rpc_delay(task, 3*HZ);
1219 dprintk("RPC: %5u rpcbind request timed out\n",
1223 /* server doesn't support any rpcbind version we know of */
1224 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1227 case -EPROTONOSUPPORT:
1228 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1230 task->tk_status = 0;
1231 task->tk_action = call_bind;
1233 case -ECONNREFUSED: /* connection problems */
1240 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1241 task->tk_pid, task->tk_status);
1242 if (!RPC_IS_SOFTCONN(task)) {
1243 rpc_delay(task, 5*HZ);
1246 status = task->tk_status;
1249 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1250 task->tk_pid, -task->tk_status);
1253 rpc_exit(task, status);
1257 task->tk_action = call_timeout;
1261 * 4b. Connect to the RPC server
1264 call_connect(struct rpc_task *task)
1266 struct rpc_xprt *xprt = task->tk_xprt;
1268 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1270 (xprt_connected(xprt) ? "is" : "is not"));
1272 task->tk_action = call_transmit;
1273 if (!xprt_connected(xprt)) {
1274 task->tk_action = call_connect_status;
1275 if (task->tk_status < 0)
1282 * 4c. Sort out connect result
1285 call_connect_status(struct rpc_task *task)
1287 struct rpc_clnt *clnt = task->tk_client;
1288 int status = task->tk_status;
1290 dprint_status(task);
1292 task->tk_status = 0;
1293 if (status >= 0 || status == -EAGAIN) {
1294 clnt->cl_stats->netreconn++;
1295 task->tk_action = call_transmit;
1300 /* if soft mounted, test if we've timed out */
1302 task->tk_action = call_timeout;
1305 rpc_exit(task, -EIO);
1310 * 5. Transmit the RPC request, and wait for reply
1313 call_transmit(struct rpc_task *task)
1315 dprint_status(task);
1317 task->tk_action = call_status;
1318 if (task->tk_status < 0)
1320 task->tk_status = xprt_prepare_transmit(task);
1321 if (task->tk_status != 0)
1323 task->tk_action = call_transmit_status;
1324 /* Encode here so that rpcsec_gss can use correct sequence number. */
1325 if (rpc_task_need_encode(task)) {
1326 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
1327 rpc_xdr_encode(task);
1328 /* Did the encode result in an error condition? */
1329 if (task->tk_status != 0) {
1330 /* Was the error nonfatal? */
1331 if (task->tk_status == -EAGAIN)
1332 rpc_delay(task, HZ >> 4);
1334 rpc_exit(task, task->tk_status);
1338 xprt_transmit(task);
1339 if (task->tk_status < 0)
1342 * On success, ensure that we call xprt_end_transmit() before sleeping
1343 * in order to allow access to the socket to other RPC requests.
1345 call_transmit_status(task);
1346 if (rpc_reply_expected(task))
1348 task->tk_action = rpc_exit_task;
1349 rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
1353 * 5a. Handle cleanup after a transmission
1356 call_transmit_status(struct rpc_task *task)
1358 task->tk_action = call_status;
1361 * Common case: success. Force the compiler to put this
1364 if (task->tk_status == 0) {
1365 xprt_end_transmit(task);
1366 rpc_task_force_reencode(task);
1370 switch (task->tk_status) {
1374 dprint_status(task);
1375 xprt_end_transmit(task);
1376 rpc_task_force_reencode(task);
1379 * Special cases: if we've been waiting on the
1380 * socket's write_space() callback, or if the
1381 * socket just returned a connection error,
1382 * then hold onto the transport lock.
1388 if (RPC_IS_SOFTCONN(task)) {
1389 xprt_end_transmit(task);
1390 rpc_exit(task, task->tk_status);
1396 rpc_task_force_reencode(task);
1400 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1402 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1403 * addition, disconnect on connectivity errors.
1406 call_bc_transmit(struct rpc_task *task)
1408 struct rpc_rqst *req = task->tk_rqstp;
1410 BUG_ON(task->tk_status != 0);
1411 task->tk_status = xprt_prepare_transmit(task);
1412 if (task->tk_status == -EAGAIN) {
1414 * Could not reserve the transport. Try again after the
1415 * transport is released.
1417 task->tk_status = 0;
1418 task->tk_action = call_bc_transmit;
1422 task->tk_action = rpc_exit_task;
1423 if (task->tk_status < 0) {
1424 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1425 "error: %d\n", task->tk_status);
1429 xprt_transmit(task);
1430 xprt_end_transmit(task);
1431 dprint_status(task);
1432 switch (task->tk_status) {
1441 * Problem reaching the server. Disconnect and let the
1442 * forechannel reestablish the connection. The server will
1443 * have to retransmit the backchannel request and we'll
1444 * reprocess it. Since these ops are idempotent, there's no
1445 * need to cache our reply at this time.
1447 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1448 "error: %d\n", task->tk_status);
1449 xprt_conditional_disconnect(task->tk_xprt,
1450 req->rq_connect_cookie);
1454 * We were unable to reply and will have to drop the
1455 * request. The server should reconnect and retransmit.
1457 BUG_ON(task->tk_status == -EAGAIN);
1458 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1459 "error: %d\n", task->tk_status);
1462 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1464 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1467 * 6. Sort out the RPC call status
1470 call_status(struct rpc_task *task)
1472 struct rpc_clnt *clnt = task->tk_client;
1473 struct rpc_rqst *req = task->tk_rqstp;
1476 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1477 task->tk_status = req->rq_reply_bytes_recvd;
1479 dprint_status(task);
1481 status = task->tk_status;
1483 task->tk_action = call_decode;
1487 task->tk_status = 0;
1493 * Delay any retries for 3 seconds, then handle as if it
1496 rpc_delay(task, 3*HZ);
1498 task->tk_action = call_timeout;
1499 if (task->tk_client->cl_discrtry)
1500 xprt_conditional_disconnect(task->tk_xprt,
1501 req->rq_connect_cookie);
1505 rpc_force_rebind(clnt);
1506 rpc_delay(task, 3*HZ);
1509 task->tk_action = call_bind;
1512 task->tk_action = call_transmit;
1515 /* shutdown or soft timeout */
1516 rpc_exit(task, status);
1519 if (clnt->cl_chatty)
1520 printk("%s: RPC call returned error %d\n",
1521 clnt->cl_protname, -status);
1522 rpc_exit(task, status);
1527 * 6a. Handle RPC timeout
1528 * We do not release the request slot, so we keep using the
1529 * same XID for all retransmits.
1532 call_timeout(struct rpc_task *task)
1534 struct rpc_clnt *clnt = task->tk_client;
1536 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1537 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1541 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1542 task->tk_timeouts++;
1544 if (RPC_IS_SOFTCONN(task)) {
1545 rpc_exit(task, -ETIMEDOUT);
1548 if (RPC_IS_SOFT(task)) {
1549 if (clnt->cl_chatty)
1550 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1551 clnt->cl_protname, clnt->cl_server);
1552 if (task->tk_flags & RPC_TASK_TIMEOUT)
1553 rpc_exit(task, -ETIMEDOUT);
1555 rpc_exit(task, -EIO);
1559 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1560 task->tk_flags |= RPC_CALL_MAJORSEEN;
1561 if (clnt->cl_chatty)
1562 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1563 clnt->cl_protname, clnt->cl_server);
1565 rpc_force_rebind(clnt);
1567 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1568 * event? RFC2203 requires the server to drop all such requests.
1570 rpcauth_invalcred(task);
1573 clnt->cl_stats->rpcretrans++;
1574 task->tk_action = call_bind;
1575 task->tk_status = 0;
1579 * 7. Decode the RPC reply
1582 call_decode(struct rpc_task *task)
1584 struct rpc_clnt *clnt = task->tk_client;
1585 struct rpc_rqst *req = task->tk_rqstp;
1586 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1589 dprint_status(task);
1591 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1592 if (clnt->cl_chatty)
1593 printk(KERN_NOTICE "%s: server %s OK\n",
1594 clnt->cl_protname, clnt->cl_server);
1595 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1599 * Ensure that we see all writes made by xprt_complete_rqst()
1600 * before it changed req->rq_reply_bytes_recvd.
1603 req->rq_rcv_buf.len = req->rq_private_buf.len;
1605 /* Check that the softirq receive buffer is valid */
1606 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1607 sizeof(req->rq_rcv_buf)) != 0);
1609 if (req->rq_rcv_buf.len < 12) {
1610 if (!RPC_IS_SOFT(task)) {
1611 task->tk_action = call_bind;
1612 clnt->cl_stats->rpcretrans++;
1615 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1616 clnt->cl_protname, task->tk_status);
1617 task->tk_action = call_timeout;
1621 p = rpc_verify_header(task);
1623 if (p == ERR_PTR(-EAGAIN))
1628 task->tk_action = rpc_exit_task;
1631 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1632 task->tk_msg.rpc_resp);
1634 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1638 task->tk_status = 0;
1639 /* Note: rpc_verify_header() may have freed the RPC slot */
1640 if (task->tk_rqstp == req) {
1641 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
1642 if (task->tk_client->cl_discrtry)
1643 xprt_conditional_disconnect(task->tk_xprt,
1644 req->rq_connect_cookie);
1649 rpc_encode_header(struct rpc_task *task)
1651 struct rpc_clnt *clnt = task->tk_client;
1652 struct rpc_rqst *req = task->tk_rqstp;
1653 __be32 *p = req->rq_svec[0].iov_base;
1655 /* FIXME: check buffer size? */
1657 p = xprt_skip_transport_header(task->tk_xprt, p);
1658 *p++ = req->rq_xid; /* XID */
1659 *p++ = htonl(RPC_CALL); /* CALL */
1660 *p++ = htonl(RPC_VERSION); /* RPC version */
1661 *p++ = htonl(clnt->cl_prog); /* program number */
1662 *p++ = htonl(clnt->cl_vers); /* program version */
1663 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
1664 p = rpcauth_marshcred(task, p);
1665 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1670 rpc_verify_header(struct rpc_task *task)
1672 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1673 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1674 __be32 *p = iov->iov_base;
1676 int error = -EACCES;
1678 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
1679 /* RFC-1014 says that the representation of XDR data must be a
1680 * multiple of four bytes
1681 * - if it isn't pointer subtraction in the NFS client may give
1684 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1685 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
1686 task->tk_rqstp->rq_rcv_buf.len);
1692 p += 1; /* skip XID */
1693 if ((n = ntohl(*p++)) != RPC_REPLY) {
1694 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1695 task->tk_pid, __func__, n);
1699 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1702 switch ((n = ntohl(*p++))) {
1703 case RPC_AUTH_ERROR:
1706 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
1707 task->tk_pid, __func__);
1708 error = -EPROTONOSUPPORT;
1711 dprintk("RPC: %5u %s: RPC call rejected, "
1712 "unknown error: %x\n",
1713 task->tk_pid, __func__, n);
1718 switch ((n = ntohl(*p++))) {
1719 case RPC_AUTH_REJECTEDCRED:
1720 case RPC_AUTH_REJECTEDVERF:
1721 case RPCSEC_GSS_CREDPROBLEM:
1722 case RPCSEC_GSS_CTXPROBLEM:
1723 if (!task->tk_cred_retry)
1725 task->tk_cred_retry--;
1726 dprintk("RPC: %5u %s: retry stale creds\n",
1727 task->tk_pid, __func__);
1728 rpcauth_invalcred(task);
1729 /* Ensure we obtain a new XID! */
1731 task->tk_action = call_reserve;
1733 case RPC_AUTH_BADCRED:
1734 case RPC_AUTH_BADVERF:
1735 /* possibly garbled cred/verf? */
1736 if (!task->tk_garb_retry)
1738 task->tk_garb_retry--;
1739 dprintk("RPC: %5u %s: retry garbled creds\n",
1740 task->tk_pid, __func__);
1741 task->tk_action = call_bind;
1743 case RPC_AUTH_TOOWEAK:
1744 printk(KERN_NOTICE "RPC: server %s requires stronger "
1745 "authentication.\n", task->tk_client->cl_server);
1748 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1749 task->tk_pid, __func__, n);
1752 dprintk("RPC: %5u %s: call rejected %d\n",
1753 task->tk_pid, __func__, n);
1756 if (!(p = rpcauth_checkverf(task, p))) {
1757 dprintk("RPC: %5u %s: auth check failed\n",
1758 task->tk_pid, __func__);
1759 goto out_garbage; /* bad verifier, retry */
1761 len = p - (__be32 *)iov->iov_base - 1;
1764 switch ((n = ntohl(*p++))) {
1767 case RPC_PROG_UNAVAIL:
1768 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1769 task->tk_pid, __func__,
1770 (unsigned int)task->tk_client->cl_prog,
1771 task->tk_client->cl_server);
1772 error = -EPFNOSUPPORT;
1774 case RPC_PROG_MISMATCH:
1775 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1776 "server %s\n", task->tk_pid, __func__,
1777 (unsigned int)task->tk_client->cl_prog,
1778 (unsigned int)task->tk_client->cl_vers,
1779 task->tk_client->cl_server);
1780 error = -EPROTONOSUPPORT;
1782 case RPC_PROC_UNAVAIL:
1783 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1784 "version %u on server %s\n",
1785 task->tk_pid, __func__,
1786 rpc_proc_name(task),
1787 task->tk_client->cl_prog,
1788 task->tk_client->cl_vers,
1789 task->tk_client->cl_server);
1790 error = -EOPNOTSUPP;
1792 case RPC_GARBAGE_ARGS:
1793 dprintk("RPC: %5u %s: server saw garbage\n",
1794 task->tk_pid, __func__);
1797 dprintk("RPC: %5u %s: server accept status: %x\n",
1798 task->tk_pid, __func__, n);
1803 task->tk_client->cl_stats->rpcgarbage++;
1804 if (task->tk_garb_retry) {
1805 task->tk_garb_retry--;
1806 dprintk("RPC: %5u %s: retrying\n",
1807 task->tk_pid, __func__);
1808 task->tk_action = call_bind;
1810 return ERR_PTR(-EAGAIN);
1815 rpc_exit(task, error);
1816 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
1818 return ERR_PTR(error);
1820 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
1825 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
1829 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
1834 static struct rpc_procinfo rpcproc_null = {
1835 .p_encode = rpcproc_encode_null,
1836 .p_decode = rpcproc_decode_null,
1839 static int rpc_ping(struct rpc_clnt *clnt)
1841 struct rpc_message msg = {
1842 .rpc_proc = &rpcproc_null,
1845 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1846 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
1847 put_rpccred(msg.rpc_cred);
1851 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
1853 struct rpc_message msg = {
1854 .rpc_proc = &rpcproc_null,
1857 struct rpc_task_setup task_setup_data = {
1859 .rpc_message = &msg,
1860 .callback_ops = &rpc_default_ops,
1863 return rpc_run_task(&task_setup_data);
1865 EXPORT_SYMBOL_GPL(rpc_call_null);
1868 static void rpc_show_header(void)
1870 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
1871 "-timeout ---ops--\n");
1874 static void rpc_show_task(const struct rpc_clnt *clnt,
1875 const struct rpc_task *task)
1877 const char *rpc_waitq = "none";
1879 if (RPC_IS_QUEUED(task))
1880 rpc_waitq = rpc_qname(task->tk_waitqueue);
1882 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
1883 task->tk_pid, task->tk_flags, task->tk_status,
1884 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
1885 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
1886 task->tk_action, rpc_waitq);
1889 void rpc_show_tasks(struct net *net)
1891 struct rpc_clnt *clnt;
1892 struct rpc_task *task;
1894 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1896 spin_lock(&sn->rpc_client_lock);
1897 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
1898 spin_lock(&clnt->cl_lock);
1899 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
1904 rpc_show_task(clnt, task);
1906 spin_unlock(&clnt->cl_lock);
1908 spin_unlock(&sn->rpc_client_lock);