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 * NB: BSD uses a more intelligent approach to guessing when a request
17 * or reply has been lost by keeping the RTO estimate for each procedure.
18 * We currently make do with a constant timeout value.
20 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
21 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
24 #include <asm/system.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/kallsyms.h>
30 #include <linux/namei.h>
31 #include <linux/mount.h>
32 #include <linux/slab.h>
33 #include <linux/utsname.h>
34 #include <linux/workqueue.h>
35 #include <linux/in6.h>
37 #include <linux/sunrpc/clnt.h>
38 #include <linux/sunrpc/rpc_pipe_fs.h>
39 #include <linux/sunrpc/metrics.h>
40 #include <linux/sunrpc/bc_xprt.h>
45 # define RPCDBG_FACILITY RPCDBG_CALL
48 #define dprint_status(t) \
49 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
50 __func__, t->tk_status)
53 * All RPC clients are linked into this list
55 static LIST_HEAD(all_clients);
56 static DEFINE_SPINLOCK(rpc_client_lock);
58 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
61 static void call_start(struct rpc_task *task);
62 static void call_reserve(struct rpc_task *task);
63 static void call_reserveresult(struct rpc_task *task);
64 static void call_allocate(struct rpc_task *task);
65 static void call_decode(struct rpc_task *task);
66 static void call_bind(struct rpc_task *task);
67 static void call_bind_status(struct rpc_task *task);
68 static void call_transmit(struct rpc_task *task);
69 #if defined(CONFIG_NFS_V4_1)
70 static void call_bc_transmit(struct rpc_task *task);
71 #endif /* CONFIG_NFS_V4_1 */
72 static void call_status(struct rpc_task *task);
73 static void call_transmit_status(struct rpc_task *task);
74 static void call_refresh(struct rpc_task *task);
75 static void call_refreshresult(struct rpc_task *task);
76 static void call_timeout(struct rpc_task *task);
77 static void call_connect(struct rpc_task *task);
78 static void call_connect_status(struct rpc_task *task);
80 static __be32 *rpc_encode_header(struct rpc_task *task);
81 static __be32 *rpc_verify_header(struct rpc_task *task);
82 static int rpc_ping(struct rpc_clnt *clnt);
84 static void rpc_register_client(struct rpc_clnt *clnt)
86 spin_lock(&rpc_client_lock);
87 list_add(&clnt->cl_clients, &all_clients);
88 spin_unlock(&rpc_client_lock);
91 static void rpc_unregister_client(struct rpc_clnt *clnt)
93 spin_lock(&rpc_client_lock);
94 list_del(&clnt->cl_clients);
95 spin_unlock(&rpc_client_lock);
99 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
101 static uint32_t clntid;
110 clnt->cl_path.mnt = ERR_PTR(-ENOENT);
111 clnt->cl_path.dentry = ERR_PTR(-ENOENT);
112 if (dir_name == NULL)
115 path.mnt = rpc_get_mount();
116 if (IS_ERR(path.mnt))
117 return PTR_ERR(path.mnt);
118 error = vfs_path_lookup(path.mnt->mnt_root, path.mnt, dir_name, 0, &nd);
123 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
124 name[sizeof(name) - 1] = '\0';
125 q.hash = full_name_hash(q.name, q.len);
126 path.dentry = rpc_create_client_dir(nd.path.dentry, &q, clnt);
127 if (!IS_ERR(path.dentry))
129 error = PTR_ERR(path.dentry);
130 if (error != -EEXIST) {
131 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
132 " %s/%s, error %d\n",
133 dir_name, name, error);
138 clnt->cl_path = path;
147 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
149 struct rpc_program *program = args->program;
150 struct rpc_version *version;
151 struct rpc_clnt *clnt = NULL;
152 struct rpc_auth *auth;
156 /* sanity check the name before trying to print it */
158 len = strlen(args->servername);
159 if (len > RPC_MAXNETNAMELEN)
163 dprintk("RPC: creating %s client for %s (xprt %p)\n",
164 program->name, args->servername, xprt);
173 if (args->version >= program->nrvers)
175 version = program->version[args->version];
180 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
183 clnt->cl_parent = clnt;
185 clnt->cl_server = clnt->cl_inline_name;
186 if (len > sizeof(clnt->cl_inline_name)) {
187 char *buf = kmalloc(len, GFP_KERNEL);
189 clnt->cl_server = buf;
191 len = sizeof(clnt->cl_inline_name);
193 strlcpy(clnt->cl_server, args->servername, len);
195 clnt->cl_xprt = xprt;
196 clnt->cl_procinfo = version->procs;
197 clnt->cl_maxproc = version->nrprocs;
198 clnt->cl_protname = program->name;
199 clnt->cl_prog = args->prognumber ? : program->number;
200 clnt->cl_vers = version->number;
201 clnt->cl_stats = program->stats;
202 clnt->cl_metrics = rpc_alloc_iostats(clnt);
204 if (clnt->cl_metrics == NULL)
206 clnt->cl_program = program;
207 INIT_LIST_HEAD(&clnt->cl_tasks);
208 spin_lock_init(&clnt->cl_lock);
210 if (!xprt_bound(clnt->cl_xprt))
211 clnt->cl_autobind = 1;
213 clnt->cl_timeout = xprt->timeout;
214 if (args->timeout != NULL) {
215 memcpy(&clnt->cl_timeout_default, args->timeout,
216 sizeof(clnt->cl_timeout_default));
217 clnt->cl_timeout = &clnt->cl_timeout_default;
220 clnt->cl_rtt = &clnt->cl_rtt_default;
221 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
222 clnt->cl_principal = NULL;
223 if (args->client_name) {
224 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
225 if (!clnt->cl_principal)
226 goto out_no_principal;
229 atomic_set(&clnt->cl_count, 1);
231 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
235 auth = rpcauth_create(args->authflavor, clnt);
237 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
243 /* save the nodename */
244 clnt->cl_nodelen = strlen(init_utsname()->nodename);
245 if (clnt->cl_nodelen > UNX_MAXNODENAME)
246 clnt->cl_nodelen = UNX_MAXNODENAME;
247 memcpy(clnt->cl_nodename, init_utsname()->nodename, clnt->cl_nodelen);
248 rpc_register_client(clnt);
252 if (!IS_ERR(clnt->cl_path.dentry)) {
253 rpc_remove_client_dir(clnt->cl_path.dentry);
257 kfree(clnt->cl_principal);
259 rpc_free_iostats(clnt->cl_metrics);
261 if (clnt->cl_server != clnt->cl_inline_name)
262 kfree(clnt->cl_server);
273 * rpc_create - create an RPC client and transport with one call
274 * @args: rpc_clnt create argument structure
276 * Creates and initializes an RPC transport and an RPC client.
278 * It can ping the server in order to determine if it is up, and to see if
279 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
280 * this behavior so asynchronous tasks can also use rpc_create.
282 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
284 struct rpc_xprt *xprt;
285 struct rpc_clnt *clnt;
286 struct xprt_create xprtargs = {
287 .ident = args->protocol,
288 .srcaddr = args->saddress,
289 .dstaddr = args->address,
290 .addrlen = args->addrsize,
291 .bc_xprt = args->bc_xprt,
296 * If the caller chooses not to specify a hostname, whip
297 * up a string representation of the passed-in address.
299 if (args->servername == NULL) {
300 servername[0] = '\0';
301 switch (args->address->sa_family) {
303 struct sockaddr_in *sin =
304 (struct sockaddr_in *)args->address;
305 snprintf(servername, sizeof(servername), "%pI4",
306 &sin->sin_addr.s_addr);
310 struct sockaddr_in6 *sin =
311 (struct sockaddr_in6 *)args->address;
312 snprintf(servername, sizeof(servername), "%pI6",
317 /* caller wants default server name, but
318 * address family isn't recognized. */
319 return ERR_PTR(-EINVAL);
321 args->servername = servername;
324 xprt = xprt_create_transport(&xprtargs);
326 return (struct rpc_clnt *)xprt;
329 * By default, kernel RPC client connects from a reserved port.
330 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
331 * but it is always enabled for rpciod, which handles the connect
335 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
338 clnt = rpc_new_client(args, xprt);
342 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
343 int err = rpc_ping(clnt);
345 rpc_shutdown_client(clnt);
350 clnt->cl_softrtry = 1;
351 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
352 clnt->cl_softrtry = 0;
354 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
355 clnt->cl_autobind = 1;
356 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
357 clnt->cl_discrtry = 1;
358 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
363 EXPORT_SYMBOL_GPL(rpc_create);
366 * This function clones the RPC client structure. It allows us to share the
367 * same transport while varying parameters such as the authentication
371 rpc_clone_client(struct rpc_clnt *clnt)
373 struct rpc_clnt *new;
376 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
379 new->cl_parent = clnt;
380 /* Turn off autobind on clones */
381 new->cl_autobind = 0;
382 INIT_LIST_HEAD(&new->cl_tasks);
383 spin_lock_init(&new->cl_lock);
384 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
385 new->cl_metrics = rpc_alloc_iostats(clnt);
386 if (new->cl_metrics == NULL)
388 if (clnt->cl_principal) {
389 new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL);
390 if (new->cl_principal == NULL)
391 goto out_no_principal;
393 atomic_set(&new->cl_count, 1);
394 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
398 atomic_inc(&new->cl_auth->au_count);
399 xprt_get(clnt->cl_xprt);
400 atomic_inc(&clnt->cl_count);
401 rpc_register_client(new);
405 kfree(new->cl_principal);
407 rpc_free_iostats(new->cl_metrics);
411 dprintk("RPC: %s: returned error %d\n", __func__, err);
414 EXPORT_SYMBOL_GPL(rpc_clone_client);
417 * Kill all tasks for the given client.
418 * XXX: kill their descendants as well?
420 void rpc_killall_tasks(struct rpc_clnt *clnt)
422 struct rpc_task *rovr;
425 if (list_empty(&clnt->cl_tasks))
427 dprintk("RPC: killing all tasks for client %p\n", clnt);
429 * Spin lock all_tasks to prevent changes...
431 spin_lock(&clnt->cl_lock);
432 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
433 if (!RPC_IS_ACTIVATED(rovr))
435 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
436 rovr->tk_flags |= RPC_TASK_KILLED;
437 rpc_exit(rovr, -EIO);
438 rpc_wake_up_queued_task(rovr->tk_waitqueue, rovr);
441 spin_unlock(&clnt->cl_lock);
443 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
446 * Properly shut down an RPC client, terminating all outstanding
449 void rpc_shutdown_client(struct rpc_clnt *clnt)
451 dprintk("RPC: shutting down %s client for %s\n",
452 clnt->cl_protname, clnt->cl_server);
454 while (!list_empty(&clnt->cl_tasks)) {
455 rpc_killall_tasks(clnt);
456 wait_event_timeout(destroy_wait,
457 list_empty(&clnt->cl_tasks), 1*HZ);
460 rpc_release_client(clnt);
462 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
468 rpc_free_client(struct rpc_clnt *clnt)
470 dprintk("RPC: destroying %s client for %s\n",
471 clnt->cl_protname, clnt->cl_server);
472 if (!IS_ERR(clnt->cl_path.dentry)) {
473 rpc_remove_client_dir(clnt->cl_path.dentry);
476 if (clnt->cl_parent != clnt) {
477 rpc_release_client(clnt->cl_parent);
480 if (clnt->cl_server != clnt->cl_inline_name)
481 kfree(clnt->cl_server);
483 rpc_unregister_client(clnt);
484 rpc_free_iostats(clnt->cl_metrics);
485 kfree(clnt->cl_principal);
486 clnt->cl_metrics = NULL;
487 xprt_put(clnt->cl_xprt);
496 rpc_free_auth(struct rpc_clnt *clnt)
498 if (clnt->cl_auth == NULL) {
499 rpc_free_client(clnt);
504 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
505 * release remaining GSS contexts. This mechanism ensures
506 * that it can do so safely.
508 atomic_inc(&clnt->cl_count);
509 rpcauth_release(clnt->cl_auth);
510 clnt->cl_auth = NULL;
511 if (atomic_dec_and_test(&clnt->cl_count))
512 rpc_free_client(clnt);
516 * Release reference to the RPC client
519 rpc_release_client(struct rpc_clnt *clnt)
521 dprintk("RPC: rpc_release_client(%p)\n", clnt);
523 if (list_empty(&clnt->cl_tasks))
524 wake_up(&destroy_wait);
525 if (atomic_dec_and_test(&clnt->cl_count))
530 * rpc_bind_new_program - bind a new RPC program to an existing client
531 * @old: old rpc_client
532 * @program: rpc program to set
533 * @vers: rpc program version
535 * Clones the rpc client and sets up a new RPC program. This is mainly
536 * of use for enabling different RPC programs to share the same transport.
537 * The Sun NFSv2/v3 ACL protocol can do this.
539 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
540 struct rpc_program *program,
543 struct rpc_clnt *clnt;
544 struct rpc_version *version;
547 BUG_ON(vers >= program->nrvers || !program->version[vers]);
548 version = program->version[vers];
549 clnt = rpc_clone_client(old);
552 clnt->cl_procinfo = version->procs;
553 clnt->cl_maxproc = version->nrprocs;
554 clnt->cl_protname = program->name;
555 clnt->cl_prog = program->number;
556 clnt->cl_vers = version->number;
557 clnt->cl_stats = program->stats;
558 err = rpc_ping(clnt);
560 rpc_shutdown_client(clnt);
566 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
568 void rpc_task_release_client(struct rpc_task *task)
570 struct rpc_clnt *clnt = task->tk_client;
573 /* Remove from client task list */
574 spin_lock(&clnt->cl_lock);
575 list_del(&task->tk_task);
576 spin_unlock(&clnt->cl_lock);
577 task->tk_client = NULL;
579 rpc_release_client(clnt);
584 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
587 rpc_task_release_client(task);
588 task->tk_client = clnt;
589 atomic_inc(&clnt->cl_count);
590 if (clnt->cl_softrtry)
591 task->tk_flags |= RPC_TASK_SOFT;
592 /* Add to the client's list of all tasks */
593 spin_lock(&clnt->cl_lock);
594 list_add_tail(&task->tk_task, &clnt->cl_tasks);
595 spin_unlock(&clnt->cl_lock);
600 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
603 task->tk_msg.rpc_proc = msg->rpc_proc;
604 task->tk_msg.rpc_argp = msg->rpc_argp;
605 task->tk_msg.rpc_resp = msg->rpc_resp;
606 if (msg->rpc_cred != NULL)
607 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
612 * Default callback for async RPC calls
615 rpc_default_callback(struct rpc_task *task, void *data)
619 static const struct rpc_call_ops rpc_default_ops = {
620 .rpc_call_done = rpc_default_callback,
624 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
625 * @task_setup_data: pointer to task initialisation data
627 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
629 struct rpc_task *task;
631 task = rpc_new_task(task_setup_data);
635 rpc_task_set_client(task, task_setup_data->rpc_client);
636 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
638 if (task->tk_status != 0) {
639 int ret = task->tk_status;
644 if (task->tk_action == NULL)
645 rpc_call_start(task);
647 atomic_inc(&task->tk_count);
652 EXPORT_SYMBOL_GPL(rpc_run_task);
655 * rpc_call_sync - Perform a synchronous RPC call
656 * @clnt: pointer to RPC client
657 * @msg: RPC call parameters
658 * @flags: RPC call flags
660 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
662 struct rpc_task *task;
663 struct rpc_task_setup task_setup_data = {
666 .callback_ops = &rpc_default_ops,
671 BUG_ON(flags & RPC_TASK_ASYNC);
673 task = rpc_run_task(&task_setup_data);
675 return PTR_ERR(task);
676 status = task->tk_status;
680 EXPORT_SYMBOL_GPL(rpc_call_sync);
683 * rpc_call_async - Perform an asynchronous RPC call
684 * @clnt: pointer to RPC client
685 * @msg: RPC call parameters
686 * @flags: RPC call flags
687 * @tk_ops: RPC call ops
688 * @data: user call data
691 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
692 const struct rpc_call_ops *tk_ops, void *data)
694 struct rpc_task *task;
695 struct rpc_task_setup task_setup_data = {
698 .callback_ops = tk_ops,
699 .callback_data = data,
700 .flags = flags|RPC_TASK_ASYNC,
703 task = rpc_run_task(&task_setup_data);
705 return PTR_ERR(task);
709 EXPORT_SYMBOL_GPL(rpc_call_async);
711 #if defined(CONFIG_NFS_V4_1)
713 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
714 * rpc_execute against it
716 * @tk_ops: RPC call ops
718 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
719 const struct rpc_call_ops *tk_ops)
721 struct rpc_task *task;
722 struct xdr_buf *xbufp = &req->rq_snd_buf;
723 struct rpc_task_setup task_setup_data = {
724 .callback_ops = tk_ops,
727 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
729 * Create an rpc_task to send the data
731 task = rpc_new_task(&task_setup_data);
733 xprt_free_bc_request(req);
736 task->tk_rqstp = req;
739 * Set up the xdr_buf length.
740 * This also indicates that the buffer is XDR encoded already.
742 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
743 xbufp->tail[0].iov_len;
745 task->tk_action = call_bc_transmit;
746 atomic_inc(&task->tk_count);
747 BUG_ON(atomic_read(&task->tk_count) != 2);
751 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
754 #endif /* CONFIG_NFS_V4_1 */
757 rpc_call_start(struct rpc_task *task)
759 task->tk_action = call_start;
761 EXPORT_SYMBOL_GPL(rpc_call_start);
764 * rpc_peeraddr - extract remote peer address from clnt's xprt
765 * @clnt: RPC client structure
766 * @buf: target buffer
767 * @bufsize: length of target buffer
769 * Returns the number of bytes that are actually in the stored address.
771 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
774 struct rpc_xprt *xprt = clnt->cl_xprt;
776 bytes = sizeof(xprt->addr);
779 memcpy(buf, &clnt->cl_xprt->addr, bytes);
780 return xprt->addrlen;
782 EXPORT_SYMBOL_GPL(rpc_peeraddr);
785 * rpc_peeraddr2str - return remote peer address in printable format
786 * @clnt: RPC client structure
787 * @format: address format
790 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
791 enum rpc_display_format_t format)
793 struct rpc_xprt *xprt = clnt->cl_xprt;
795 if (xprt->address_strings[format] != NULL)
796 return xprt->address_strings[format];
798 return "unprintable";
800 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
803 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
805 struct rpc_xprt *xprt = clnt->cl_xprt;
806 if (xprt->ops->set_buffer_size)
807 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
809 EXPORT_SYMBOL_GPL(rpc_setbufsize);
812 * Return size of largest payload RPC client can support, in bytes
814 * For stream transports, this is one RPC record fragment (see RFC
815 * 1831), as we don't support multi-record requests yet. For datagram
816 * transports, this is the size of an IP packet minus the IP, UDP, and
819 size_t rpc_max_payload(struct rpc_clnt *clnt)
821 return clnt->cl_xprt->max_payload;
823 EXPORT_SYMBOL_GPL(rpc_max_payload);
826 * rpc_force_rebind - force transport to check that remote port is unchanged
827 * @clnt: client to rebind
830 void rpc_force_rebind(struct rpc_clnt *clnt)
832 if (clnt->cl_autobind)
833 xprt_clear_bound(clnt->cl_xprt);
835 EXPORT_SYMBOL_GPL(rpc_force_rebind);
838 * Restart an (async) RPC call from the call_prepare state.
839 * Usually called from within the exit handler.
842 rpc_restart_call_prepare(struct rpc_task *task)
844 if (RPC_ASSASSINATED(task))
846 task->tk_action = rpc_prepare_task;
849 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
852 * Restart an (async) RPC call. Usually called from within the
856 rpc_restart_call(struct rpc_task *task)
858 if (RPC_ASSASSINATED(task))
860 task->tk_action = call_start;
863 EXPORT_SYMBOL_GPL(rpc_restart_call);
866 static const char *rpc_proc_name(const struct rpc_task *task)
868 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
883 * Other FSM states can be visited zero or more times, but
884 * this state is visited exactly once for each RPC.
887 call_start(struct rpc_task *task)
889 struct rpc_clnt *clnt = task->tk_client;
891 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
892 clnt->cl_protname, clnt->cl_vers,
894 (RPC_IS_ASYNC(task) ? "async" : "sync"));
896 /* Increment call count */
897 task->tk_msg.rpc_proc->p_count++;
898 clnt->cl_stats->rpccnt++;
899 task->tk_action = call_reserve;
903 * 1. Reserve an RPC call slot
906 call_reserve(struct rpc_task *task)
911 task->tk_action = call_reserveresult;
916 * 1b. Grok the result of xprt_reserve()
919 call_reserveresult(struct rpc_task *task)
921 int status = task->tk_status;
926 * After a call to xprt_reserve(), we must have either
927 * a request slot or else an error status.
931 if (task->tk_rqstp) {
932 task->tk_action = call_refresh;
936 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
938 rpc_exit(task, -EIO);
943 * Even though there was an error, we may have acquired
944 * a request slot somehow. Make sure not to leak it.
946 if (task->tk_rqstp) {
947 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
953 case -EAGAIN: /* woken up; retry */
954 task->tk_action = call_reserve;
956 case -EIO: /* probably a shutdown */
959 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
963 rpc_exit(task, status);
967 * 2. Bind and/or refresh the credentials
970 call_refresh(struct rpc_task *task)
974 task->tk_action = call_refreshresult;
976 task->tk_client->cl_stats->rpcauthrefresh++;
977 rpcauth_refreshcred(task);
981 * 2a. Process the results of a credential refresh
984 call_refreshresult(struct rpc_task *task)
986 int status = task->tk_status;
991 task->tk_action = call_allocate;
992 if (status >= 0 && rpcauth_uptodatecred(task))
996 rpc_exit(task, -EACCES);
999 rpc_exit(task, -ENOMEM);
1002 rpc_delay(task, 3*HZ);
1004 task->tk_action = call_refresh;
1008 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1009 * (Note: buffer memory is freed in xprt_release).
1012 call_allocate(struct rpc_task *task)
1014 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1015 struct rpc_rqst *req = task->tk_rqstp;
1016 struct rpc_xprt *xprt = task->tk_xprt;
1017 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1019 dprint_status(task);
1021 task->tk_status = 0;
1022 task->tk_action = call_bind;
1027 if (proc->p_proc != 0) {
1028 BUG_ON(proc->p_arglen == 0);
1029 if (proc->p_decode != NULL)
1030 BUG_ON(proc->p_replen == 0);
1034 * Calculate the size (in quads) of the RPC call
1035 * and reply headers, and convert both values
1038 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1039 req->rq_callsize <<= 2;
1040 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1041 req->rq_rcvsize <<= 2;
1043 req->rq_buffer = xprt->ops->buf_alloc(task,
1044 req->rq_callsize + req->rq_rcvsize);
1045 if (req->rq_buffer != NULL)
1048 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1050 if (RPC_IS_ASYNC(task) || !signalled()) {
1051 task->tk_action = call_allocate;
1052 rpc_delay(task, HZ>>4);
1056 rpc_exit(task, -ERESTARTSYS);
1060 rpc_task_need_encode(struct rpc_task *task)
1062 return task->tk_rqstp->rq_snd_buf.len == 0;
1066 rpc_task_force_reencode(struct rpc_task *task)
1068 task->tk_rqstp->rq_snd_buf.len = 0;
1069 task->tk_rqstp->rq_bytes_sent = 0;
1073 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1075 buf->head[0].iov_base = start;
1076 buf->head[0].iov_len = len;
1077 buf->tail[0].iov_len = 0;
1085 * 3. Encode arguments of an RPC call
1088 rpc_xdr_encode(struct rpc_task *task)
1090 struct rpc_rqst *req = task->tk_rqstp;
1094 dprint_status(task);
1096 rpc_xdr_buf_init(&req->rq_snd_buf,
1099 rpc_xdr_buf_init(&req->rq_rcv_buf,
1100 (char *)req->rq_buffer + req->rq_callsize,
1103 p = rpc_encode_header(task);
1105 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1106 rpc_exit(task, -EIO);
1110 encode = task->tk_msg.rpc_proc->p_encode;
1114 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1115 task->tk_msg.rpc_argp);
1119 * 4. Get the server port number if not yet set
1122 call_bind(struct rpc_task *task)
1124 struct rpc_xprt *xprt = task->tk_xprt;
1126 dprint_status(task);
1128 task->tk_action = call_connect;
1129 if (!xprt_bound(xprt)) {
1130 task->tk_action = call_bind_status;
1131 task->tk_timeout = xprt->bind_timeout;
1132 xprt->ops->rpcbind(task);
1137 * 4a. Sort out bind result
1140 call_bind_status(struct rpc_task *task)
1144 if (task->tk_status >= 0) {
1145 dprint_status(task);
1146 task->tk_status = 0;
1147 task->tk_action = call_connect;
1151 switch (task->tk_status) {
1153 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1154 rpc_delay(task, HZ >> 2);
1157 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1158 "unavailable\n", task->tk_pid);
1159 /* fail immediately if this is an RPC ping */
1160 if (task->tk_msg.rpc_proc->p_proc == 0) {
1161 status = -EOPNOTSUPP;
1164 rpc_delay(task, 3*HZ);
1167 dprintk("RPC: %5u rpcbind request timed out\n",
1171 /* server doesn't support any rpcbind version we know of */
1172 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1175 case -EPROTONOSUPPORT:
1176 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1178 task->tk_status = 0;
1179 task->tk_action = call_bind;
1181 case -ECONNREFUSED: /* connection problems */
1188 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1189 task->tk_pid, task->tk_status);
1190 if (!RPC_IS_SOFTCONN(task)) {
1191 rpc_delay(task, 5*HZ);
1194 status = task->tk_status;
1197 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1198 task->tk_pid, -task->tk_status);
1201 rpc_exit(task, status);
1205 task->tk_action = call_timeout;
1209 * 4b. Connect to the RPC server
1212 call_connect(struct rpc_task *task)
1214 struct rpc_xprt *xprt = task->tk_xprt;
1216 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1218 (xprt_connected(xprt) ? "is" : "is not"));
1220 task->tk_action = call_transmit;
1221 if (!xprt_connected(xprt)) {
1222 task->tk_action = call_connect_status;
1223 if (task->tk_status < 0)
1230 * 4c. Sort out connect result
1233 call_connect_status(struct rpc_task *task)
1235 struct rpc_clnt *clnt = task->tk_client;
1236 int status = task->tk_status;
1238 dprint_status(task);
1240 task->tk_status = 0;
1241 if (status >= 0 || status == -EAGAIN) {
1242 clnt->cl_stats->netreconn++;
1243 task->tk_action = call_transmit;
1248 /* if soft mounted, test if we've timed out */
1250 task->tk_action = call_timeout;
1253 rpc_exit(task, -EIO);
1258 * 5. Transmit the RPC request, and wait for reply
1261 call_transmit(struct rpc_task *task)
1263 dprint_status(task);
1265 task->tk_action = call_status;
1266 if (task->tk_status < 0)
1268 task->tk_status = xprt_prepare_transmit(task);
1269 if (task->tk_status != 0)
1271 task->tk_action = call_transmit_status;
1272 /* Encode here so that rpcsec_gss can use correct sequence number. */
1273 if (rpc_task_need_encode(task)) {
1274 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
1275 rpc_xdr_encode(task);
1276 /* Did the encode result in an error condition? */
1277 if (task->tk_status != 0) {
1278 /* Was the error nonfatal? */
1279 if (task->tk_status == -EAGAIN)
1280 rpc_delay(task, HZ >> 4);
1282 rpc_exit(task, task->tk_status);
1286 xprt_transmit(task);
1287 if (task->tk_status < 0)
1290 * On success, ensure that we call xprt_end_transmit() before sleeping
1291 * in order to allow access to the socket to other RPC requests.
1293 call_transmit_status(task);
1294 if (rpc_reply_expected(task))
1296 task->tk_action = rpc_exit_task;
1297 rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
1301 * 5a. Handle cleanup after a transmission
1304 call_transmit_status(struct rpc_task *task)
1306 task->tk_action = call_status;
1309 * Common case: success. Force the compiler to put this
1312 if (task->tk_status == 0) {
1313 xprt_end_transmit(task);
1314 rpc_task_force_reencode(task);
1318 switch (task->tk_status) {
1322 dprint_status(task);
1323 xprt_end_transmit(task);
1324 rpc_task_force_reencode(task);
1327 * Special cases: if we've been waiting on the
1328 * socket's write_space() callback, or if the
1329 * socket just returned a connection error,
1330 * then hold onto the transport lock.
1336 if (RPC_IS_SOFTCONN(task)) {
1337 xprt_end_transmit(task);
1338 rpc_exit(task, task->tk_status);
1344 rpc_task_force_reencode(task);
1348 #if defined(CONFIG_NFS_V4_1)
1350 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1351 * addition, disconnect on connectivity errors.
1354 call_bc_transmit(struct rpc_task *task)
1356 struct rpc_rqst *req = task->tk_rqstp;
1358 BUG_ON(task->tk_status != 0);
1359 task->tk_status = xprt_prepare_transmit(task);
1360 if (task->tk_status == -EAGAIN) {
1362 * Could not reserve the transport. Try again after the
1363 * transport is released.
1365 task->tk_status = 0;
1366 task->tk_action = call_bc_transmit;
1370 task->tk_action = rpc_exit_task;
1371 if (task->tk_status < 0) {
1372 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1373 "error: %d\n", task->tk_status);
1377 xprt_transmit(task);
1378 xprt_end_transmit(task);
1379 dprint_status(task);
1380 switch (task->tk_status) {
1389 * Problem reaching the server. Disconnect and let the
1390 * forechannel reestablish the connection. The server will
1391 * have to retransmit the backchannel request and we'll
1392 * reprocess it. Since these ops are idempotent, there's no
1393 * need to cache our reply at this time.
1395 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1396 "error: %d\n", task->tk_status);
1397 xprt_conditional_disconnect(task->tk_xprt,
1398 req->rq_connect_cookie);
1402 * We were unable to reply and will have to drop the
1403 * request. The server should reconnect and retransmit.
1405 BUG_ON(task->tk_status == -EAGAIN);
1406 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1407 "error: %d\n", task->tk_status);
1410 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1412 #endif /* CONFIG_NFS_V4_1 */
1415 * 6. Sort out the RPC call status
1418 call_status(struct rpc_task *task)
1420 struct rpc_clnt *clnt = task->tk_client;
1421 struct rpc_rqst *req = task->tk_rqstp;
1424 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1425 task->tk_status = req->rq_reply_bytes_recvd;
1427 dprint_status(task);
1429 status = task->tk_status;
1431 task->tk_action = call_decode;
1435 task->tk_status = 0;
1441 * Delay any retries for 3 seconds, then handle as if it
1444 rpc_delay(task, 3*HZ);
1446 task->tk_action = call_timeout;
1447 if (task->tk_client->cl_discrtry)
1448 xprt_conditional_disconnect(task->tk_xprt,
1449 req->rq_connect_cookie);
1453 rpc_force_rebind(clnt);
1454 rpc_delay(task, 3*HZ);
1457 task->tk_action = call_bind;
1460 task->tk_action = call_transmit;
1463 /* shutdown or soft timeout */
1464 rpc_exit(task, status);
1467 if (clnt->cl_chatty)
1468 printk("%s: RPC call returned error %d\n",
1469 clnt->cl_protname, -status);
1470 rpc_exit(task, status);
1475 * 6a. Handle RPC timeout
1476 * We do not release the request slot, so we keep using the
1477 * same XID for all retransmits.
1480 call_timeout(struct rpc_task *task)
1482 struct rpc_clnt *clnt = task->tk_client;
1484 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1485 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1489 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1490 task->tk_timeouts++;
1492 if (RPC_IS_SOFTCONN(task)) {
1493 rpc_exit(task, -ETIMEDOUT);
1496 if (RPC_IS_SOFT(task)) {
1497 if (clnt->cl_chatty)
1498 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1499 clnt->cl_protname, clnt->cl_server);
1500 rpc_exit(task, -EIO);
1504 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1505 task->tk_flags |= RPC_CALL_MAJORSEEN;
1506 if (clnt->cl_chatty)
1507 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1508 clnt->cl_protname, clnt->cl_server);
1510 rpc_force_rebind(clnt);
1512 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1513 * event? RFC2203 requires the server to drop all such requests.
1515 rpcauth_invalcred(task);
1518 clnt->cl_stats->rpcretrans++;
1519 task->tk_action = call_bind;
1520 task->tk_status = 0;
1524 * 7. Decode the RPC reply
1527 call_decode(struct rpc_task *task)
1529 struct rpc_clnt *clnt = task->tk_client;
1530 struct rpc_rqst *req = task->tk_rqstp;
1531 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
1534 dprintk("RPC: %5u call_decode (status %d)\n",
1535 task->tk_pid, task->tk_status);
1537 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1538 if (clnt->cl_chatty)
1539 printk(KERN_NOTICE "%s: server %s OK\n",
1540 clnt->cl_protname, clnt->cl_server);
1541 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1545 * Ensure that we see all writes made by xprt_complete_rqst()
1546 * before it changed req->rq_reply_bytes_recvd.
1549 req->rq_rcv_buf.len = req->rq_private_buf.len;
1551 /* Check that the softirq receive buffer is valid */
1552 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1553 sizeof(req->rq_rcv_buf)) != 0);
1555 if (req->rq_rcv_buf.len < 12) {
1556 if (!RPC_IS_SOFT(task)) {
1557 task->tk_action = call_bind;
1558 clnt->cl_stats->rpcretrans++;
1561 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1562 clnt->cl_protname, task->tk_status);
1563 task->tk_action = call_timeout;
1567 p = rpc_verify_header(task);
1569 if (p == ERR_PTR(-EAGAIN))
1574 task->tk_action = rpc_exit_task;
1577 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1578 task->tk_msg.rpc_resp);
1580 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1584 task->tk_status = 0;
1585 /* Note: rpc_verify_header() may have freed the RPC slot */
1586 if (task->tk_rqstp == req) {
1587 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
1588 if (task->tk_client->cl_discrtry)
1589 xprt_conditional_disconnect(task->tk_xprt,
1590 req->rq_connect_cookie);
1595 rpc_encode_header(struct rpc_task *task)
1597 struct rpc_clnt *clnt = task->tk_client;
1598 struct rpc_rqst *req = task->tk_rqstp;
1599 __be32 *p = req->rq_svec[0].iov_base;
1601 /* FIXME: check buffer size? */
1603 p = xprt_skip_transport_header(task->tk_xprt, p);
1604 *p++ = req->rq_xid; /* XID */
1605 *p++ = htonl(RPC_CALL); /* CALL */
1606 *p++ = htonl(RPC_VERSION); /* RPC version */
1607 *p++ = htonl(clnt->cl_prog); /* program number */
1608 *p++ = htonl(clnt->cl_vers); /* program version */
1609 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
1610 p = rpcauth_marshcred(task, p);
1611 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1616 rpc_verify_header(struct rpc_task *task)
1618 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1619 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1620 __be32 *p = iov->iov_base;
1622 int error = -EACCES;
1624 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
1625 /* RFC-1014 says that the representation of XDR data must be a
1626 * multiple of four bytes
1627 * - if it isn't pointer subtraction in the NFS client may give
1630 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1631 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
1632 task->tk_rqstp->rq_rcv_buf.len);
1638 p += 1; /* skip XID */
1639 if ((n = ntohl(*p++)) != RPC_REPLY) {
1640 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1641 task->tk_pid, __func__, n);
1645 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1648 switch ((n = ntohl(*p++))) {
1649 case RPC_AUTH_ERROR:
1652 dprintk("RPC: %5u %s: RPC call version "
1654 task->tk_pid, __func__);
1655 error = -EPROTONOSUPPORT;
1658 dprintk("RPC: %5u %s: RPC call rejected, "
1659 "unknown error: %x\n",
1660 task->tk_pid, __func__, n);
1665 switch ((n = ntohl(*p++))) {
1666 case RPC_AUTH_REJECTEDCRED:
1667 case RPC_AUTH_REJECTEDVERF:
1668 case RPCSEC_GSS_CREDPROBLEM:
1669 case RPCSEC_GSS_CTXPROBLEM:
1670 if (!task->tk_cred_retry)
1672 task->tk_cred_retry--;
1673 dprintk("RPC: %5u %s: retry stale creds\n",
1674 task->tk_pid, __func__);
1675 rpcauth_invalcred(task);
1676 /* Ensure we obtain a new XID! */
1678 task->tk_action = call_reserve;
1680 case RPC_AUTH_BADCRED:
1681 case RPC_AUTH_BADVERF:
1682 /* possibly garbled cred/verf? */
1683 if (!task->tk_garb_retry)
1685 task->tk_garb_retry--;
1686 dprintk("RPC: %5u %s: retry garbled creds\n",
1687 task->tk_pid, __func__);
1688 task->tk_action = call_bind;
1690 case RPC_AUTH_TOOWEAK:
1691 printk(KERN_NOTICE "RPC: server %s requires stronger "
1692 "authentication.\n", task->tk_client->cl_server);
1695 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1696 task->tk_pid, __func__, n);
1699 dprintk("RPC: %5u %s: call rejected %d\n",
1700 task->tk_pid, __func__, n);
1703 if (!(p = rpcauth_checkverf(task, p))) {
1704 dprintk("RPC: %5u %s: auth check failed\n",
1705 task->tk_pid, __func__);
1706 goto out_garbage; /* bad verifier, retry */
1708 len = p - (__be32 *)iov->iov_base - 1;
1711 switch ((n = ntohl(*p++))) {
1714 case RPC_PROG_UNAVAIL:
1715 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1716 task->tk_pid, __func__,
1717 (unsigned int)task->tk_client->cl_prog,
1718 task->tk_client->cl_server);
1719 error = -EPFNOSUPPORT;
1721 case RPC_PROG_MISMATCH:
1722 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1723 "server %s\n", task->tk_pid, __func__,
1724 (unsigned int)task->tk_client->cl_prog,
1725 (unsigned int)task->tk_client->cl_vers,
1726 task->tk_client->cl_server);
1727 error = -EPROTONOSUPPORT;
1729 case RPC_PROC_UNAVAIL:
1730 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1731 "version %u on server %s\n",
1732 task->tk_pid, __func__,
1733 rpc_proc_name(task),
1734 task->tk_client->cl_prog,
1735 task->tk_client->cl_vers,
1736 task->tk_client->cl_server);
1737 error = -EOPNOTSUPP;
1739 case RPC_GARBAGE_ARGS:
1740 dprintk("RPC: %5u %s: server saw garbage\n",
1741 task->tk_pid, __func__);
1744 dprintk("RPC: %5u %s: server accept status: %x\n",
1745 task->tk_pid, __func__, n);
1750 task->tk_client->cl_stats->rpcgarbage++;
1751 if (task->tk_garb_retry) {
1752 task->tk_garb_retry--;
1753 dprintk("RPC: %5u %s: retrying\n",
1754 task->tk_pid, __func__);
1755 task->tk_action = call_bind;
1757 return ERR_PTR(-EAGAIN);
1762 rpc_exit(task, error);
1763 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
1765 return ERR_PTR(error);
1767 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
1772 static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj)
1777 static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj)
1782 static struct rpc_procinfo rpcproc_null = {
1783 .p_encode = rpcproc_encode_null,
1784 .p_decode = rpcproc_decode_null,
1787 static int rpc_ping(struct rpc_clnt *clnt)
1789 struct rpc_message msg = {
1790 .rpc_proc = &rpcproc_null,
1793 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1794 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
1795 put_rpccred(msg.rpc_cred);
1799 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
1801 struct rpc_message msg = {
1802 .rpc_proc = &rpcproc_null,
1805 struct rpc_task_setup task_setup_data = {
1807 .rpc_message = &msg,
1808 .callback_ops = &rpc_default_ops,
1811 return rpc_run_task(&task_setup_data);
1813 EXPORT_SYMBOL_GPL(rpc_call_null);
1816 static void rpc_show_header(void)
1818 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
1819 "-timeout ---ops--\n");
1822 static void rpc_show_task(const struct rpc_clnt *clnt,
1823 const struct rpc_task *task)
1825 const char *rpc_waitq = "none";
1826 char *p, action[KSYM_SYMBOL_LEN];
1828 if (RPC_IS_QUEUED(task))
1829 rpc_waitq = rpc_qname(task->tk_waitqueue);
1831 /* map tk_action pointer to a function name; then trim off
1832 * the "+0x0 [sunrpc]" */
1833 sprint_symbol(action, (unsigned long)task->tk_action);
1834 p = strchr(action, '+');
1838 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n",
1839 task->tk_pid, task->tk_flags, task->tk_status,
1840 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
1841 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
1845 void rpc_show_tasks(void)
1847 struct rpc_clnt *clnt;
1848 struct rpc_task *task;
1851 spin_lock(&rpc_client_lock);
1852 list_for_each_entry(clnt, &all_clients, cl_clients) {
1853 spin_lock(&clnt->cl_lock);
1854 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
1859 rpc_show_task(clnt, task);
1861 spin_unlock(&clnt->cl_lock);
1863 spin_unlock(&rpc_client_lock);