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>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/kallsyms.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/slab.h>
28 #include <linux/utsname.h>
29 #include <linux/workqueue.h>
31 #include <linux/in6.h>
33 #include <linux/rcupdate.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
38 #include <linux/sunrpc/metrics.h>
39 #include <linux/sunrpc/bc_xprt.h>
40 #include <trace/events/sunrpc.h>
46 # define RPCDBG_FACILITY RPCDBG_CALL
49 #define dprint_status(t) \
50 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
51 __func__, t->tk_status)
54 * All RPC clients are linked into this list
57 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
60 static void call_start(struct rpc_task *task);
61 static void call_reserve(struct rpc_task *task);
62 static void call_reserveresult(struct rpc_task *task);
63 static void call_allocate(struct rpc_task *task);
64 static void call_decode(struct rpc_task *task);
65 static void call_bind(struct rpc_task *task);
66 static void call_bind_status(struct rpc_task *task);
67 static void call_transmit(struct rpc_task *task);
68 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
69 static void call_bc_transmit(struct rpc_task *task);
70 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
71 static void call_status(struct rpc_task *task);
72 static void call_transmit_status(struct rpc_task *task);
73 static void call_refresh(struct rpc_task *task);
74 static void call_refreshresult(struct rpc_task *task);
75 static void call_timeout(struct rpc_task *task);
76 static void call_connect(struct rpc_task *task);
77 static void call_connect_status(struct rpc_task *task);
79 static __be32 *rpc_encode_header(struct rpc_task *task);
80 static __be32 *rpc_verify_header(struct rpc_task *task);
81 static int rpc_ping(struct rpc_clnt *clnt);
83 static void rpc_register_client(struct rpc_clnt *clnt)
85 struct net *net = rpc_net_ns(clnt);
86 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
88 spin_lock(&sn->rpc_client_lock);
89 list_add(&clnt->cl_clients, &sn->all_clients);
90 spin_unlock(&sn->rpc_client_lock);
93 static void rpc_unregister_client(struct rpc_clnt *clnt)
95 struct net *net = rpc_net_ns(clnt);
96 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
98 spin_lock(&sn->rpc_client_lock);
99 list_del(&clnt->cl_clients);
100 spin_unlock(&sn->rpc_client_lock);
103 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
105 if (clnt->cl_dentry) {
106 if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy)
107 clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth);
108 rpc_remove_client_dir(clnt->cl_dentry);
110 clnt->cl_dentry = NULL;
113 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
115 struct net *net = rpc_net_ns(clnt);
116 struct super_block *pipefs_sb;
118 pipefs_sb = rpc_get_sb_net(net);
120 __rpc_clnt_remove_pipedir(clnt);
125 static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
126 struct rpc_clnt *clnt,
127 const char *dir_name)
129 static uint32_t clntid;
131 struct qstr q = { .name = name };
132 struct dentry *dir, *dentry;
135 dir = rpc_d_lookup_sb(sb, dir_name);
137 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
141 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
142 name[sizeof(name) - 1] = '\0';
143 q.hash = full_name_hash(q.name, q.len);
144 dentry = rpc_create_client_dir(dir, &q, clnt);
147 error = PTR_ERR(dentry);
148 if (error != -EEXIST) {
149 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
150 " %s/%s, error %d\n",
151 dir_name, name, error);
160 rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name)
162 struct net *net = rpc_net_ns(clnt);
163 struct super_block *pipefs_sb;
164 struct dentry *dentry;
166 clnt->cl_dentry = NULL;
167 if (dir_name == NULL)
169 pipefs_sb = rpc_get_sb_net(net);
172 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name);
175 return PTR_ERR(dentry);
176 clnt->cl_dentry = dentry;
180 static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
182 if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
183 ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
188 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
189 struct super_block *sb)
191 struct dentry *dentry;
195 case RPC_PIPEFS_MOUNT:
196 dentry = rpc_setup_pipedir_sb(sb, clnt,
197 clnt->cl_program->pipe_dir_name);
201 return PTR_ERR(dentry);
202 clnt->cl_dentry = dentry;
203 if (clnt->cl_auth->au_ops->pipes_create) {
204 err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth);
206 __rpc_clnt_remove_pipedir(clnt);
209 case RPC_PIPEFS_UMOUNT:
210 __rpc_clnt_remove_pipedir(clnt);
213 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
219 static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
220 struct super_block *sb)
224 for (;; clnt = clnt->cl_parent) {
225 if (!rpc_clnt_skip_event(clnt, event))
226 error = __rpc_clnt_handle_event(clnt, event, sb);
227 if (error || clnt == clnt->cl_parent)
233 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
235 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
236 struct rpc_clnt *clnt;
238 spin_lock(&sn->rpc_client_lock);
239 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
240 if (clnt->cl_program->pipe_dir_name == NULL)
242 if (rpc_clnt_skip_event(clnt, event))
244 if (atomic_inc_not_zero(&clnt->cl_count) == 0)
246 spin_unlock(&sn->rpc_client_lock);
249 spin_unlock(&sn->rpc_client_lock);
253 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
256 struct super_block *sb = ptr;
257 struct rpc_clnt *clnt;
260 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
261 error = __rpc_pipefs_event(clnt, event, sb);
262 rpc_release_client(clnt);
269 static struct notifier_block rpc_clients_block = {
270 .notifier_call = rpc_pipefs_event,
271 .priority = SUNRPC_PIPEFS_RPC_PRIO,
274 int rpc_clients_notifier_register(void)
276 return rpc_pipefs_notifier_register(&rpc_clients_block);
279 void rpc_clients_notifier_unregister(void)
281 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
284 static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
286 clnt->cl_nodelen = strlen(nodename);
287 if (clnt->cl_nodelen > UNX_MAXNODENAME)
288 clnt->cl_nodelen = UNX_MAXNODENAME;
289 memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
292 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
294 const struct rpc_program *program = args->program;
295 const struct rpc_version *version;
296 struct rpc_clnt *clnt = NULL;
297 struct rpc_auth *auth;
300 /* sanity check the name before trying to print it */
301 dprintk("RPC: creating %s client for %s (xprt %p)\n",
302 program->name, args->servername, xprt);
311 if (args->version >= program->nrvers)
313 version = program->version[args->version];
318 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
321 clnt->cl_parent = clnt;
323 rcu_assign_pointer(clnt->cl_xprt, xprt);
324 clnt->cl_procinfo = version->procs;
325 clnt->cl_maxproc = version->nrprocs;
326 clnt->cl_protname = program->name;
327 clnt->cl_prog = args->prognumber ? : program->number;
328 clnt->cl_vers = version->number;
329 clnt->cl_stats = program->stats;
330 clnt->cl_metrics = rpc_alloc_iostats(clnt);
332 if (clnt->cl_metrics == NULL)
334 clnt->cl_program = program;
335 INIT_LIST_HEAD(&clnt->cl_tasks);
336 spin_lock_init(&clnt->cl_lock);
338 if (!xprt_bound(xprt))
339 clnt->cl_autobind = 1;
341 clnt->cl_timeout = xprt->timeout;
342 if (args->timeout != NULL) {
343 memcpy(&clnt->cl_timeout_default, args->timeout,
344 sizeof(clnt->cl_timeout_default));
345 clnt->cl_timeout = &clnt->cl_timeout_default;
348 clnt->cl_rtt = &clnt->cl_rtt_default;
349 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
350 clnt->cl_principal = NULL;
351 if (args->client_name) {
352 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
353 if (!clnt->cl_principal)
354 goto out_no_principal;
357 atomic_set(&clnt->cl_count, 1);
359 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
363 auth = rpcauth_create(args->authflavor, clnt);
365 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
371 /* save the nodename */
372 rpc_clnt_set_nodename(clnt, utsname()->nodename);
373 rpc_register_client(clnt);
377 rpc_clnt_remove_pipedir(clnt);
379 kfree(clnt->cl_principal);
381 rpc_free_iostats(clnt->cl_metrics);
393 * rpc_create - create an RPC client and transport with one call
394 * @args: rpc_clnt create argument structure
396 * Creates and initializes an RPC transport and an RPC client.
398 * It can ping the server in order to determine if it is up, and to see if
399 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
400 * this behavior so asynchronous tasks can also use rpc_create.
402 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
404 struct rpc_xprt *xprt;
405 struct rpc_clnt *clnt;
406 struct xprt_create xprtargs = {
408 .ident = args->protocol,
409 .srcaddr = args->saddress,
410 .dstaddr = args->address,
411 .addrlen = args->addrsize,
412 .servername = args->servername,
413 .bc_xprt = args->bc_xprt,
418 * If the caller chooses not to specify a hostname, whip
419 * up a string representation of the passed-in address.
421 if (xprtargs.servername == NULL) {
422 struct sockaddr_un *sun =
423 (struct sockaddr_un *)args->address;
424 struct sockaddr_in *sin =
425 (struct sockaddr_in *)args->address;
426 struct sockaddr_in6 *sin6 =
427 (struct sockaddr_in6 *)args->address;
429 servername[0] = '\0';
430 switch (args->address->sa_family) {
432 snprintf(servername, sizeof(servername), "%s",
436 snprintf(servername, sizeof(servername), "%pI4",
437 &sin->sin_addr.s_addr);
440 snprintf(servername, sizeof(servername), "%pI6",
444 /* caller wants default server name, but
445 * address family isn't recognized. */
446 return ERR_PTR(-EINVAL);
448 xprtargs.servername = servername;
451 xprt = xprt_create_transport(&xprtargs);
453 return (struct rpc_clnt *)xprt;
456 * By default, kernel RPC client connects from a reserved port.
457 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
458 * but it is always enabled for rpciod, which handles the connect
462 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
465 clnt = rpc_new_client(args, xprt);
469 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
470 int err = rpc_ping(clnt);
472 rpc_shutdown_client(clnt);
477 clnt->cl_softrtry = 1;
478 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
479 clnt->cl_softrtry = 0;
481 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
482 clnt->cl_autobind = 1;
483 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
484 clnt->cl_discrtry = 1;
485 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
490 EXPORT_SYMBOL_GPL(rpc_create);
493 * This function clones the RPC client structure. It allows us to share the
494 * same transport while varying parameters such as the authentication
497 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
498 struct rpc_clnt *clnt)
500 struct rpc_xprt *xprt;
501 struct rpc_clnt *new;
506 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
510 args->servername = xprt->servername;
512 new = rpc_new_client(args, xprt);
518 atomic_inc(&clnt->cl_count);
519 new->cl_parent = clnt;
521 /* Turn off autobind on clones */
522 new->cl_autobind = 0;
523 new->cl_softrtry = clnt->cl_softrtry;
524 new->cl_discrtry = clnt->cl_discrtry;
525 new->cl_chatty = clnt->cl_chatty;
531 dprintk("RPC: %s: returned error %d\n", __func__, err);
536 * rpc_clone_client - Clone an RPC client structure
538 * @clnt: RPC client whose parameters are copied
540 * Returns a fresh RPC client or an ERR_PTR.
542 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
544 struct rpc_create_args args = {
545 .program = clnt->cl_program,
546 .prognumber = clnt->cl_prog,
547 .version = clnt->cl_vers,
548 .authflavor = clnt->cl_auth->au_flavor,
549 .client_name = clnt->cl_principal,
551 return __rpc_clone_client(&args, clnt);
553 EXPORT_SYMBOL_GPL(rpc_clone_client);
556 * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
558 * @clnt: RPC client whose parameters are copied
559 * @flavor: security flavor for new client
561 * Returns a fresh RPC client or an ERR_PTR.
564 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
566 struct rpc_create_args args = {
567 .program = clnt->cl_program,
568 .prognumber = clnt->cl_prog,
569 .version = clnt->cl_vers,
570 .authflavor = flavor,
571 .client_name = clnt->cl_principal,
573 return __rpc_clone_client(&args, clnt);
575 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
578 * Kill all tasks for the given client.
579 * XXX: kill their descendants as well?
581 void rpc_killall_tasks(struct rpc_clnt *clnt)
583 struct rpc_task *rovr;
586 if (list_empty(&clnt->cl_tasks))
588 dprintk("RPC: killing all tasks for client %p\n", clnt);
590 * Spin lock all_tasks to prevent changes...
592 spin_lock(&clnt->cl_lock);
593 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
594 if (!RPC_IS_ACTIVATED(rovr))
596 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
597 rovr->tk_flags |= RPC_TASK_KILLED;
598 rpc_exit(rovr, -EIO);
599 if (RPC_IS_QUEUED(rovr))
600 rpc_wake_up_queued_task(rovr->tk_waitqueue,
604 spin_unlock(&clnt->cl_lock);
606 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
609 * Properly shut down an RPC client, terminating all outstanding
612 void rpc_shutdown_client(struct rpc_clnt *clnt)
616 dprintk_rcu("RPC: shutting down %s client for %s\n",
618 rcu_dereference(clnt->cl_xprt)->servername);
620 while (!list_empty(&clnt->cl_tasks)) {
621 rpc_killall_tasks(clnt);
622 wait_event_timeout(destroy_wait,
623 list_empty(&clnt->cl_tasks), 1*HZ);
626 rpc_release_client(clnt);
628 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
634 rpc_free_client(struct rpc_clnt *clnt)
636 dprintk_rcu("RPC: destroying %s client for %s\n",
638 rcu_dereference(clnt->cl_xprt)->servername);
639 if (clnt->cl_parent != clnt)
640 rpc_release_client(clnt->cl_parent);
641 rpc_unregister_client(clnt);
642 rpc_clnt_remove_pipedir(clnt);
643 rpc_free_iostats(clnt->cl_metrics);
644 kfree(clnt->cl_principal);
645 clnt->cl_metrics = NULL;
646 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
655 rpc_free_auth(struct rpc_clnt *clnt)
657 if (clnt->cl_auth == NULL) {
658 rpc_free_client(clnt);
663 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
664 * release remaining GSS contexts. This mechanism ensures
665 * that it can do so safely.
667 atomic_inc(&clnt->cl_count);
668 rpcauth_release(clnt->cl_auth);
669 clnt->cl_auth = NULL;
670 if (atomic_dec_and_test(&clnt->cl_count))
671 rpc_free_client(clnt);
675 * Release reference to the RPC client
678 rpc_release_client(struct rpc_clnt *clnt)
680 dprintk("RPC: rpc_release_client(%p)\n", clnt);
682 if (list_empty(&clnt->cl_tasks))
683 wake_up(&destroy_wait);
684 if (atomic_dec_and_test(&clnt->cl_count))
689 * rpc_bind_new_program - bind a new RPC program to an existing client
690 * @old: old rpc_client
691 * @program: rpc program to set
692 * @vers: rpc program version
694 * Clones the rpc client and sets up a new RPC program. This is mainly
695 * of use for enabling different RPC programs to share the same transport.
696 * The Sun NFSv2/v3 ACL protocol can do this.
698 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
699 const struct rpc_program *program,
702 struct rpc_create_args args = {
704 .prognumber = program->number,
706 .authflavor = old->cl_auth->au_flavor,
707 .client_name = old->cl_principal,
709 struct rpc_clnt *clnt;
712 clnt = __rpc_clone_client(&args, old);
715 err = rpc_ping(clnt);
717 rpc_shutdown_client(clnt);
723 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
725 void rpc_task_release_client(struct rpc_task *task)
727 struct rpc_clnt *clnt = task->tk_client;
730 /* Remove from client task list */
731 spin_lock(&clnt->cl_lock);
732 list_del(&task->tk_task);
733 spin_unlock(&clnt->cl_lock);
734 task->tk_client = NULL;
736 rpc_release_client(clnt);
741 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
744 rpc_task_release_client(task);
745 task->tk_client = clnt;
746 atomic_inc(&clnt->cl_count);
747 if (clnt->cl_softrtry)
748 task->tk_flags |= RPC_TASK_SOFT;
749 if (sk_memalloc_socks()) {
750 struct rpc_xprt *xprt;
753 xprt = rcu_dereference(clnt->cl_xprt);
755 task->tk_flags |= RPC_TASK_SWAPPER;
758 /* Add to the client's list of all tasks */
759 spin_lock(&clnt->cl_lock);
760 list_add_tail(&task->tk_task, &clnt->cl_tasks);
761 spin_unlock(&clnt->cl_lock);
765 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
767 rpc_task_release_client(task);
768 rpc_task_set_client(task, clnt);
770 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
774 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
777 task->tk_msg.rpc_proc = msg->rpc_proc;
778 task->tk_msg.rpc_argp = msg->rpc_argp;
779 task->tk_msg.rpc_resp = msg->rpc_resp;
780 if (msg->rpc_cred != NULL)
781 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
786 * Default callback for async RPC calls
789 rpc_default_callback(struct rpc_task *task, void *data)
793 static const struct rpc_call_ops rpc_default_ops = {
794 .rpc_call_done = rpc_default_callback,
798 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
799 * @task_setup_data: pointer to task initialisation data
801 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
803 struct rpc_task *task;
805 task = rpc_new_task(task_setup_data);
809 rpc_task_set_client(task, task_setup_data->rpc_client);
810 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
812 if (task->tk_action == NULL)
813 rpc_call_start(task);
815 atomic_inc(&task->tk_count);
820 EXPORT_SYMBOL_GPL(rpc_run_task);
823 * rpc_call_sync - Perform a synchronous RPC call
824 * @clnt: pointer to RPC client
825 * @msg: RPC call parameters
826 * @flags: RPC call flags
828 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
830 struct rpc_task *task;
831 struct rpc_task_setup task_setup_data = {
834 .callback_ops = &rpc_default_ops,
839 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
840 if (flags & RPC_TASK_ASYNC) {
841 rpc_release_calldata(task_setup_data.callback_ops,
842 task_setup_data.callback_data);
846 task = rpc_run_task(&task_setup_data);
848 return PTR_ERR(task);
849 status = task->tk_status;
853 EXPORT_SYMBOL_GPL(rpc_call_sync);
856 * rpc_call_async - Perform an asynchronous RPC call
857 * @clnt: pointer to RPC client
858 * @msg: RPC call parameters
859 * @flags: RPC call flags
860 * @tk_ops: RPC call ops
861 * @data: user call data
864 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
865 const struct rpc_call_ops *tk_ops, void *data)
867 struct rpc_task *task;
868 struct rpc_task_setup task_setup_data = {
871 .callback_ops = tk_ops,
872 .callback_data = data,
873 .flags = flags|RPC_TASK_ASYNC,
876 task = rpc_run_task(&task_setup_data);
878 return PTR_ERR(task);
882 EXPORT_SYMBOL_GPL(rpc_call_async);
884 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
886 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
887 * rpc_execute against it
889 * @tk_ops: RPC call ops
891 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
892 const struct rpc_call_ops *tk_ops)
894 struct rpc_task *task;
895 struct xdr_buf *xbufp = &req->rq_snd_buf;
896 struct rpc_task_setup task_setup_data = {
897 .callback_ops = tk_ops,
900 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
902 * Create an rpc_task to send the data
904 task = rpc_new_task(&task_setup_data);
906 xprt_free_bc_request(req);
909 task->tk_rqstp = req;
912 * Set up the xdr_buf length.
913 * This also indicates that the buffer is XDR encoded already.
915 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
916 xbufp->tail[0].iov_len;
918 task->tk_action = call_bc_transmit;
919 atomic_inc(&task->tk_count);
920 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
924 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
927 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
930 rpc_call_start(struct rpc_task *task)
932 task->tk_action = call_start;
934 EXPORT_SYMBOL_GPL(rpc_call_start);
937 * rpc_peeraddr - extract remote peer address from clnt's xprt
938 * @clnt: RPC client structure
939 * @buf: target buffer
940 * @bufsize: length of target buffer
942 * Returns the number of bytes that are actually in the stored address.
944 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
947 struct rpc_xprt *xprt;
950 xprt = rcu_dereference(clnt->cl_xprt);
952 bytes = xprt->addrlen;
955 memcpy(buf, &xprt->addr, bytes);
960 EXPORT_SYMBOL_GPL(rpc_peeraddr);
963 * rpc_peeraddr2str - return remote peer address in printable format
964 * @clnt: RPC client structure
965 * @format: address format
967 * NB: the lifetime of the memory referenced by the returned pointer is
968 * the same as the rpc_xprt itself. As long as the caller uses this
969 * pointer, it must hold the RCU read lock.
971 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
972 enum rpc_display_format_t format)
974 struct rpc_xprt *xprt;
976 xprt = rcu_dereference(clnt->cl_xprt);
978 if (xprt->address_strings[format] != NULL)
979 return xprt->address_strings[format];
981 return "unprintable";
983 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
985 static const struct sockaddr_in rpc_inaddr_loopback = {
986 .sin_family = AF_INET,
987 .sin_addr.s_addr = htonl(INADDR_ANY),
990 static const struct sockaddr_in6 rpc_in6addr_loopback = {
991 .sin6_family = AF_INET6,
992 .sin6_addr = IN6ADDR_ANY_INIT,
996 * Try a getsockname() on a connected datagram socket. Using a
997 * connected datagram socket prevents leaving a socket in TIME_WAIT.
998 * This conserves the ephemeral port number space.
1000 * Returns zero and fills in "buf" if successful; otherwise, a
1001 * negative errno is returned.
1003 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1004 struct sockaddr *buf, int buflen)
1006 struct socket *sock;
1009 err = __sock_create(net, sap->sa_family,
1010 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1012 dprintk("RPC: can't create UDP socket (%d)\n", err);
1016 switch (sap->sa_family) {
1018 err = kernel_bind(sock,
1019 (struct sockaddr *)&rpc_inaddr_loopback,
1020 sizeof(rpc_inaddr_loopback));
1023 err = kernel_bind(sock,
1024 (struct sockaddr *)&rpc_in6addr_loopback,
1025 sizeof(rpc_in6addr_loopback));
1028 err = -EAFNOSUPPORT;
1032 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1036 err = kernel_connect(sock, sap, salen, 0);
1038 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1042 err = kernel_getsockname(sock, buf, &buflen);
1044 dprintk("RPC: getsockname failed (%d)\n", err);
1049 if (buf->sa_family == AF_INET6) {
1050 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1051 sin6->sin6_scope_id = 0;
1053 dprintk("RPC: %s succeeded\n", __func__);
1062 * Scraping a connected socket failed, so we don't have a useable
1063 * local address. Fallback: generate an address that will prevent
1064 * the server from calling us back.
1066 * Returns zero and fills in "buf" if successful; otherwise, a
1067 * negative errno is returned.
1069 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1073 if (buflen < sizeof(rpc_inaddr_loopback))
1075 memcpy(buf, &rpc_inaddr_loopback,
1076 sizeof(rpc_inaddr_loopback));
1079 if (buflen < sizeof(rpc_in6addr_loopback))
1081 memcpy(buf, &rpc_in6addr_loopback,
1082 sizeof(rpc_in6addr_loopback));
1084 dprintk("RPC: %s: address family not supported\n",
1086 return -EAFNOSUPPORT;
1088 dprintk("RPC: %s: succeeded\n", __func__);
1093 * rpc_localaddr - discover local endpoint address for an RPC client
1094 * @clnt: RPC client structure
1095 * @buf: target buffer
1096 * @buflen: size of target buffer, in bytes
1098 * Returns zero and fills in "buf" and "buflen" if successful;
1099 * otherwise, a negative errno is returned.
1101 * This works even if the underlying transport is not currently connected,
1102 * or if the upper layer never previously provided a source address.
1104 * The result of this function call is transient: multiple calls in
1105 * succession may give different results, depending on how local
1106 * networking configuration changes over time.
1108 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1110 struct sockaddr_storage address;
1111 struct sockaddr *sap = (struct sockaddr *)&address;
1112 struct rpc_xprt *xprt;
1118 xprt = rcu_dereference(clnt->cl_xprt);
1119 salen = xprt->addrlen;
1120 memcpy(sap, &xprt->addr, salen);
1121 net = get_net(xprt->xprt_net);
1124 rpc_set_port(sap, 0);
1125 err = rpc_sockname(net, sap, salen, buf, buflen);
1128 /* Couldn't discover local address, return ANYADDR */
1129 return rpc_anyaddr(sap->sa_family, buf, buflen);
1132 EXPORT_SYMBOL_GPL(rpc_localaddr);
1135 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1137 struct rpc_xprt *xprt;
1140 xprt = rcu_dereference(clnt->cl_xprt);
1141 if (xprt->ops->set_buffer_size)
1142 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1145 EXPORT_SYMBOL_GPL(rpc_setbufsize);
1148 * rpc_protocol - Get transport protocol number for an RPC client
1149 * @clnt: RPC client to query
1152 int rpc_protocol(struct rpc_clnt *clnt)
1157 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1161 EXPORT_SYMBOL_GPL(rpc_protocol);
1164 * rpc_net_ns - Get the network namespace for this RPC client
1165 * @clnt: RPC client to query
1168 struct net *rpc_net_ns(struct rpc_clnt *clnt)
1173 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1177 EXPORT_SYMBOL_GPL(rpc_net_ns);
1180 * rpc_max_payload - Get maximum payload size for a transport, in bytes
1181 * @clnt: RPC client to query
1183 * For stream transports, this is one RPC record fragment (see RFC
1184 * 1831), as we don't support multi-record requests yet. For datagram
1185 * transports, this is the size of an IP packet minus the IP, UDP, and
1188 size_t rpc_max_payload(struct rpc_clnt *clnt)
1193 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1197 EXPORT_SYMBOL_GPL(rpc_max_payload);
1200 * rpc_force_rebind - force transport to check that remote port is unchanged
1201 * @clnt: client to rebind
1204 void rpc_force_rebind(struct rpc_clnt *clnt)
1206 if (clnt->cl_autobind) {
1208 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1212 EXPORT_SYMBOL_GPL(rpc_force_rebind);
1215 * Restart an (async) RPC call from the call_prepare state.
1216 * Usually called from within the exit handler.
1219 rpc_restart_call_prepare(struct rpc_task *task)
1221 if (RPC_ASSASSINATED(task))
1223 task->tk_action = call_start;
1224 if (task->tk_ops->rpc_call_prepare != NULL)
1225 task->tk_action = rpc_prepare_task;
1228 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1231 * Restart an (async) RPC call. Usually called from within the
1235 rpc_restart_call(struct rpc_task *task)
1237 if (RPC_ASSASSINATED(task))
1239 task->tk_action = call_start;
1242 EXPORT_SYMBOL_GPL(rpc_restart_call);
1245 static const char *rpc_proc_name(const struct rpc_task *task)
1247 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1251 return proc->p_name;
1262 * Other FSM states can be visited zero or more times, but
1263 * this state is visited exactly once for each RPC.
1266 call_start(struct rpc_task *task)
1268 struct rpc_clnt *clnt = task->tk_client;
1270 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1271 clnt->cl_protname, clnt->cl_vers,
1272 rpc_proc_name(task),
1273 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1275 /* Increment call count */
1276 task->tk_msg.rpc_proc->p_count++;
1277 clnt->cl_stats->rpccnt++;
1278 task->tk_action = call_reserve;
1282 * 1. Reserve an RPC call slot
1285 call_reserve(struct rpc_task *task)
1287 dprint_status(task);
1289 task->tk_status = 0;
1290 task->tk_action = call_reserveresult;
1295 * 1b. Grok the result of xprt_reserve()
1298 call_reserveresult(struct rpc_task *task)
1300 int status = task->tk_status;
1302 dprint_status(task);
1305 * After a call to xprt_reserve(), we must have either
1306 * a request slot or else an error status.
1308 task->tk_status = 0;
1310 if (task->tk_rqstp) {
1311 task->tk_action = call_refresh;
1315 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1317 rpc_exit(task, -EIO);
1322 * Even though there was an error, we may have acquired
1323 * a request slot somehow. Make sure not to leak it.
1325 if (task->tk_rqstp) {
1326 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1333 rpc_delay(task, HZ >> 2);
1334 case -EAGAIN: /* woken up; retry */
1335 task->tk_action = call_reserve;
1337 case -EIO: /* probably a shutdown */
1340 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1344 rpc_exit(task, status);
1348 * 2. Bind and/or refresh the credentials
1351 call_refresh(struct rpc_task *task)
1353 dprint_status(task);
1355 task->tk_action = call_refreshresult;
1356 task->tk_status = 0;
1357 task->tk_client->cl_stats->rpcauthrefresh++;
1358 rpcauth_refreshcred(task);
1362 * 2a. Process the results of a credential refresh
1365 call_refreshresult(struct rpc_task *task)
1367 int status = task->tk_status;
1369 dprint_status(task);
1371 task->tk_status = 0;
1372 task->tk_action = call_refresh;
1375 if (rpcauth_uptodatecred(task))
1376 task->tk_action = call_allocate;
1379 rpc_delay(task, 3*HZ);
1383 if (!task->tk_cred_retry)
1385 task->tk_cred_retry--;
1386 dprintk("RPC: %5u %s: retry refresh creds\n",
1387 task->tk_pid, __func__);
1390 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1391 task->tk_pid, __func__, status);
1392 rpc_exit(task, status);
1396 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1397 * (Note: buffer memory is freed in xprt_release).
1400 call_allocate(struct rpc_task *task)
1402 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1403 struct rpc_rqst *req = task->tk_rqstp;
1404 struct rpc_xprt *xprt = req->rq_xprt;
1405 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1407 dprint_status(task);
1409 task->tk_status = 0;
1410 task->tk_action = call_bind;
1415 if (proc->p_proc != 0) {
1416 BUG_ON(proc->p_arglen == 0);
1417 if (proc->p_decode != NULL)
1418 BUG_ON(proc->p_replen == 0);
1422 * Calculate the size (in quads) of the RPC call
1423 * and reply headers, and convert both values
1426 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1427 req->rq_callsize <<= 2;
1428 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1429 req->rq_rcvsize <<= 2;
1431 req->rq_buffer = xprt->ops->buf_alloc(task,
1432 req->rq_callsize + req->rq_rcvsize);
1433 if (req->rq_buffer != NULL)
1436 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1438 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1439 task->tk_action = call_allocate;
1440 rpc_delay(task, HZ>>4);
1444 rpc_exit(task, -ERESTARTSYS);
1448 rpc_task_need_encode(struct rpc_task *task)
1450 return task->tk_rqstp->rq_snd_buf.len == 0;
1454 rpc_task_force_reencode(struct rpc_task *task)
1456 task->tk_rqstp->rq_snd_buf.len = 0;
1457 task->tk_rqstp->rq_bytes_sent = 0;
1461 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1463 buf->head[0].iov_base = start;
1464 buf->head[0].iov_len = len;
1465 buf->tail[0].iov_len = 0;
1473 * 3. Encode arguments of an RPC call
1476 rpc_xdr_encode(struct rpc_task *task)
1478 struct rpc_rqst *req = task->tk_rqstp;
1482 dprint_status(task);
1484 rpc_xdr_buf_init(&req->rq_snd_buf,
1487 rpc_xdr_buf_init(&req->rq_rcv_buf,
1488 (char *)req->rq_buffer + req->rq_callsize,
1491 p = rpc_encode_header(task);
1493 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1494 rpc_exit(task, -EIO);
1498 encode = task->tk_msg.rpc_proc->p_encode;
1502 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1503 task->tk_msg.rpc_argp);
1507 * 4. Get the server port number if not yet set
1510 call_bind(struct rpc_task *task)
1512 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1514 dprint_status(task);
1516 task->tk_action = call_connect;
1517 if (!xprt_bound(xprt)) {
1518 task->tk_action = call_bind_status;
1519 task->tk_timeout = xprt->bind_timeout;
1520 xprt->ops->rpcbind(task);
1525 * 4a. Sort out bind result
1528 call_bind_status(struct rpc_task *task)
1532 if (task->tk_status >= 0) {
1533 dprint_status(task);
1534 task->tk_status = 0;
1535 task->tk_action = call_connect;
1539 trace_rpc_bind_status(task);
1540 switch (task->tk_status) {
1542 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1543 rpc_delay(task, HZ >> 2);
1546 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1547 "unavailable\n", task->tk_pid);
1548 /* fail immediately if this is an RPC ping */
1549 if (task->tk_msg.rpc_proc->p_proc == 0) {
1550 status = -EOPNOTSUPP;
1553 if (task->tk_rebind_retry == 0)
1555 task->tk_rebind_retry--;
1556 rpc_delay(task, 3*HZ);
1559 dprintk("RPC: %5u rpcbind request timed out\n",
1563 /* server doesn't support any rpcbind version we know of */
1564 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1567 case -EPROTONOSUPPORT:
1568 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1570 task->tk_status = 0;
1571 task->tk_action = call_bind;
1573 case -ECONNREFUSED: /* connection problems */
1580 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1581 task->tk_pid, task->tk_status);
1582 if (!RPC_IS_SOFTCONN(task)) {
1583 rpc_delay(task, 5*HZ);
1586 status = task->tk_status;
1589 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1590 task->tk_pid, -task->tk_status);
1593 rpc_exit(task, status);
1597 task->tk_action = call_timeout;
1601 * 4b. Connect to the RPC server
1604 call_connect(struct rpc_task *task)
1606 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1608 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1610 (xprt_connected(xprt) ? "is" : "is not"));
1612 task->tk_action = call_transmit;
1613 if (!xprt_connected(xprt)) {
1614 task->tk_action = call_connect_status;
1615 if (task->tk_status < 0)
1622 * 4c. Sort out connect result
1625 call_connect_status(struct rpc_task *task)
1627 struct rpc_clnt *clnt = task->tk_client;
1628 int status = task->tk_status;
1630 dprint_status(task);
1632 task->tk_status = 0;
1633 if (status >= 0 || status == -EAGAIN) {
1634 clnt->cl_stats->netreconn++;
1635 task->tk_action = call_transmit;
1639 trace_rpc_connect_status(task, status);
1641 /* if soft mounted, test if we've timed out */
1643 task->tk_action = call_timeout;
1646 rpc_exit(task, -EIO);
1651 * 5. Transmit the RPC request, and wait for reply
1654 call_transmit(struct rpc_task *task)
1656 dprint_status(task);
1658 task->tk_action = call_status;
1659 if (task->tk_status < 0)
1661 task->tk_status = xprt_prepare_transmit(task);
1662 if (task->tk_status != 0)
1664 task->tk_action = call_transmit_status;
1665 /* Encode here so that rpcsec_gss can use correct sequence number. */
1666 if (rpc_task_need_encode(task)) {
1667 rpc_xdr_encode(task);
1668 /* Did the encode result in an error condition? */
1669 if (task->tk_status != 0) {
1670 /* Was the error nonfatal? */
1671 if (task->tk_status == -EAGAIN)
1672 rpc_delay(task, HZ >> 4);
1674 rpc_exit(task, task->tk_status);
1678 xprt_transmit(task);
1679 if (task->tk_status < 0)
1682 * On success, ensure that we call xprt_end_transmit() before sleeping
1683 * in order to allow access to the socket to other RPC requests.
1685 call_transmit_status(task);
1686 if (rpc_reply_expected(task))
1688 task->tk_action = rpc_exit_task;
1689 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1693 * 5a. Handle cleanup after a transmission
1696 call_transmit_status(struct rpc_task *task)
1698 task->tk_action = call_status;
1701 * Common case: success. Force the compiler to put this
1704 if (task->tk_status == 0) {
1705 xprt_end_transmit(task);
1706 rpc_task_force_reencode(task);
1710 switch (task->tk_status) {
1714 dprint_status(task);
1715 xprt_end_transmit(task);
1716 rpc_task_force_reencode(task);
1719 * Special cases: if we've been waiting on the
1720 * socket's write_space() callback, or if the
1721 * socket just returned a connection error,
1722 * then hold onto the transport lock.
1728 if (RPC_IS_SOFTCONN(task)) {
1729 xprt_end_transmit(task);
1730 rpc_exit(task, task->tk_status);
1736 rpc_task_force_reencode(task);
1740 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1742 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1743 * addition, disconnect on connectivity errors.
1746 call_bc_transmit(struct rpc_task *task)
1748 struct rpc_rqst *req = task->tk_rqstp;
1750 task->tk_status = xprt_prepare_transmit(task);
1751 if (task->tk_status == -EAGAIN) {
1753 * Could not reserve the transport. Try again after the
1754 * transport is released.
1756 task->tk_status = 0;
1757 task->tk_action = call_bc_transmit;
1761 task->tk_action = rpc_exit_task;
1762 if (task->tk_status < 0) {
1763 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1764 "error: %d\n", task->tk_status);
1768 xprt_transmit(task);
1769 xprt_end_transmit(task);
1770 dprint_status(task);
1771 switch (task->tk_status) {
1780 * Problem reaching the server. Disconnect and let the
1781 * forechannel reestablish the connection. The server will
1782 * have to retransmit the backchannel request and we'll
1783 * reprocess it. Since these ops are idempotent, there's no
1784 * need to cache our reply at this time.
1786 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1787 "error: %d\n", task->tk_status);
1788 xprt_conditional_disconnect(req->rq_xprt,
1789 req->rq_connect_cookie);
1793 * We were unable to reply and will have to drop the
1794 * request. The server should reconnect and retransmit.
1796 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1797 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1798 "error: %d\n", task->tk_status);
1801 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1803 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1806 * 6. Sort out the RPC call status
1809 call_status(struct rpc_task *task)
1811 struct rpc_clnt *clnt = task->tk_client;
1812 struct rpc_rqst *req = task->tk_rqstp;
1815 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1816 task->tk_status = req->rq_reply_bytes_recvd;
1818 dprint_status(task);
1820 status = task->tk_status;
1822 task->tk_action = call_decode;
1826 trace_rpc_call_status(task);
1827 task->tk_status = 0;
1833 * Delay any retries for 3 seconds, then handle as if it
1836 rpc_delay(task, 3*HZ);
1838 task->tk_action = call_timeout;
1839 if (task->tk_client->cl_discrtry)
1840 xprt_conditional_disconnect(req->rq_xprt,
1841 req->rq_connect_cookie);
1845 rpc_force_rebind(clnt);
1846 rpc_delay(task, 3*HZ);
1849 task->tk_action = call_bind;
1852 task->tk_action = call_transmit;
1855 /* shutdown or soft timeout */
1856 rpc_exit(task, status);
1859 if (clnt->cl_chatty)
1860 printk("%s: RPC call returned error %d\n",
1861 clnt->cl_protname, -status);
1862 rpc_exit(task, status);
1867 * 6a. Handle RPC timeout
1868 * We do not release the request slot, so we keep using the
1869 * same XID for all retransmits.
1872 call_timeout(struct rpc_task *task)
1874 struct rpc_clnt *clnt = task->tk_client;
1876 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1877 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1881 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1882 task->tk_timeouts++;
1884 if (RPC_IS_SOFTCONN(task)) {
1885 rpc_exit(task, -ETIMEDOUT);
1888 if (RPC_IS_SOFT(task)) {
1889 if (clnt->cl_chatty) {
1891 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1893 rcu_dereference(clnt->cl_xprt)->servername);
1896 if (task->tk_flags & RPC_TASK_TIMEOUT)
1897 rpc_exit(task, -ETIMEDOUT);
1899 rpc_exit(task, -EIO);
1903 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1904 task->tk_flags |= RPC_CALL_MAJORSEEN;
1905 if (clnt->cl_chatty) {
1907 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1909 rcu_dereference(clnt->cl_xprt)->servername);
1913 rpc_force_rebind(clnt);
1915 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1916 * event? RFC2203 requires the server to drop all such requests.
1918 rpcauth_invalcred(task);
1921 clnt->cl_stats->rpcretrans++;
1922 task->tk_action = call_bind;
1923 task->tk_status = 0;
1927 * 7. Decode the RPC reply
1930 call_decode(struct rpc_task *task)
1932 struct rpc_clnt *clnt = task->tk_client;
1933 struct rpc_rqst *req = task->tk_rqstp;
1934 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1937 dprint_status(task);
1939 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1940 if (clnt->cl_chatty) {
1942 printk(KERN_NOTICE "%s: server %s OK\n",
1944 rcu_dereference(clnt->cl_xprt)->servername);
1947 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1951 * Ensure that we see all writes made by xprt_complete_rqst()
1952 * before it changed req->rq_reply_bytes_recvd.
1955 req->rq_rcv_buf.len = req->rq_private_buf.len;
1957 /* Check that the softirq receive buffer is valid */
1958 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1959 sizeof(req->rq_rcv_buf)) != 0);
1961 if (req->rq_rcv_buf.len < 12) {
1962 if (!RPC_IS_SOFT(task)) {
1963 task->tk_action = call_bind;
1964 clnt->cl_stats->rpcretrans++;
1967 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1968 clnt->cl_protname, task->tk_status);
1969 task->tk_action = call_timeout;
1973 p = rpc_verify_header(task);
1975 if (p == ERR_PTR(-EAGAIN))
1980 task->tk_action = rpc_exit_task;
1983 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1984 task->tk_msg.rpc_resp);
1986 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1990 task->tk_status = 0;
1991 /* Note: rpc_verify_header() may have freed the RPC slot */
1992 if (task->tk_rqstp == req) {
1993 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
1994 if (task->tk_client->cl_discrtry)
1995 xprt_conditional_disconnect(req->rq_xprt,
1996 req->rq_connect_cookie);
2001 rpc_encode_header(struct rpc_task *task)
2003 struct rpc_clnt *clnt = task->tk_client;
2004 struct rpc_rqst *req = task->tk_rqstp;
2005 __be32 *p = req->rq_svec[0].iov_base;
2007 /* FIXME: check buffer size? */
2009 p = xprt_skip_transport_header(req->rq_xprt, p);
2010 *p++ = req->rq_xid; /* XID */
2011 *p++ = htonl(RPC_CALL); /* CALL */
2012 *p++ = htonl(RPC_VERSION); /* RPC version */
2013 *p++ = htonl(clnt->cl_prog); /* program number */
2014 *p++ = htonl(clnt->cl_vers); /* program version */
2015 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
2016 p = rpcauth_marshcred(task, p);
2017 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2022 rpc_verify_header(struct rpc_task *task)
2024 struct rpc_clnt *clnt = task->tk_client;
2025 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2026 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2027 __be32 *p = iov->iov_base;
2029 int error = -EACCES;
2031 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2032 /* RFC-1014 says that the representation of XDR data must be a
2033 * multiple of four bytes
2034 * - if it isn't pointer subtraction in the NFS client may give
2037 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2038 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2039 task->tk_rqstp->rq_rcv_buf.len);
2045 p += 1; /* skip XID */
2046 if ((n = ntohl(*p++)) != RPC_REPLY) {
2047 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2048 task->tk_pid, __func__, n);
2052 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2055 switch ((n = ntohl(*p++))) {
2056 case RPC_AUTH_ERROR:
2059 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2060 task->tk_pid, __func__);
2061 error = -EPROTONOSUPPORT;
2064 dprintk("RPC: %5u %s: RPC call rejected, "
2065 "unknown error: %x\n",
2066 task->tk_pid, __func__, n);
2071 switch ((n = ntohl(*p++))) {
2072 case RPC_AUTH_REJECTEDCRED:
2073 case RPC_AUTH_REJECTEDVERF:
2074 case RPCSEC_GSS_CREDPROBLEM:
2075 case RPCSEC_GSS_CTXPROBLEM:
2076 if (!task->tk_cred_retry)
2078 task->tk_cred_retry--;
2079 dprintk("RPC: %5u %s: retry stale creds\n",
2080 task->tk_pid, __func__);
2081 rpcauth_invalcred(task);
2082 /* Ensure we obtain a new XID! */
2084 task->tk_action = call_reserve;
2086 case RPC_AUTH_BADCRED:
2087 case RPC_AUTH_BADVERF:
2088 /* possibly garbled cred/verf? */
2089 if (!task->tk_garb_retry)
2091 task->tk_garb_retry--;
2092 dprintk("RPC: %5u %s: retry garbled creds\n",
2093 task->tk_pid, __func__);
2094 task->tk_action = call_bind;
2096 case RPC_AUTH_TOOWEAK:
2098 printk(KERN_NOTICE "RPC: server %s requires stronger "
2099 "authentication.\n",
2100 rcu_dereference(clnt->cl_xprt)->servername);
2104 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2105 task->tk_pid, __func__, n);
2108 dprintk("RPC: %5u %s: call rejected %d\n",
2109 task->tk_pid, __func__, n);
2112 if (!(p = rpcauth_checkverf(task, p))) {
2113 dprintk("RPC: %5u %s: auth check failed\n",
2114 task->tk_pid, __func__);
2115 goto out_garbage; /* bad verifier, retry */
2117 len = p - (__be32 *)iov->iov_base - 1;
2120 switch ((n = ntohl(*p++))) {
2123 case RPC_PROG_UNAVAIL:
2124 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2125 "by server %s\n", task->tk_pid, __func__,
2126 (unsigned int)clnt->cl_prog,
2127 rcu_dereference(clnt->cl_xprt)->servername);
2128 error = -EPFNOSUPPORT;
2130 case RPC_PROG_MISMATCH:
2131 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2132 "by server %s\n", task->tk_pid, __func__,
2133 (unsigned int)clnt->cl_prog,
2134 (unsigned int)clnt->cl_vers,
2135 rcu_dereference(clnt->cl_xprt)->servername);
2136 error = -EPROTONOSUPPORT;
2138 case RPC_PROC_UNAVAIL:
2139 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2140 "version %u on server %s\n",
2141 task->tk_pid, __func__,
2142 rpc_proc_name(task),
2143 clnt->cl_prog, clnt->cl_vers,
2144 rcu_dereference(clnt->cl_xprt)->servername);
2145 error = -EOPNOTSUPP;
2147 case RPC_GARBAGE_ARGS:
2148 dprintk("RPC: %5u %s: server saw garbage\n",
2149 task->tk_pid, __func__);
2152 dprintk("RPC: %5u %s: server accept status: %x\n",
2153 task->tk_pid, __func__, n);
2158 clnt->cl_stats->rpcgarbage++;
2159 if (task->tk_garb_retry) {
2160 task->tk_garb_retry--;
2161 dprintk("RPC: %5u %s: retrying\n",
2162 task->tk_pid, __func__);
2163 task->tk_action = call_bind;
2165 return ERR_PTR(-EAGAIN);
2170 rpc_exit(task, error);
2171 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2173 return ERR_PTR(error);
2175 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2180 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2184 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2189 static struct rpc_procinfo rpcproc_null = {
2190 .p_encode = rpcproc_encode_null,
2191 .p_decode = rpcproc_decode_null,
2194 static int rpc_ping(struct rpc_clnt *clnt)
2196 struct rpc_message msg = {
2197 .rpc_proc = &rpcproc_null,
2200 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2201 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2202 put_rpccred(msg.rpc_cred);
2206 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2208 struct rpc_message msg = {
2209 .rpc_proc = &rpcproc_null,
2212 struct rpc_task_setup task_setup_data = {
2214 .rpc_message = &msg,
2215 .callback_ops = &rpc_default_ops,
2218 return rpc_run_task(&task_setup_data);
2220 EXPORT_SYMBOL_GPL(rpc_call_null);
2223 static void rpc_show_header(void)
2225 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2226 "-timeout ---ops--\n");
2229 static void rpc_show_task(const struct rpc_clnt *clnt,
2230 const struct rpc_task *task)
2232 const char *rpc_waitq = "none";
2234 if (RPC_IS_QUEUED(task))
2235 rpc_waitq = rpc_qname(task->tk_waitqueue);
2237 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2238 task->tk_pid, task->tk_flags, task->tk_status,
2239 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2240 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
2241 task->tk_action, rpc_waitq);
2244 void rpc_show_tasks(struct net *net)
2246 struct rpc_clnt *clnt;
2247 struct rpc_task *task;
2249 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2251 spin_lock(&sn->rpc_client_lock);
2252 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2253 spin_lock(&clnt->cl_lock);
2254 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2259 rpc_show_task(clnt, task);
2261 spin_unlock(&clnt->cl_lock);
2263 spin_unlock(&sn->rpc_client_lock);