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/slab.h>
31 #include <linux/smp_lock.h>
32 #include <linux/utsname.h>
33 #include <linux/workqueue.h>
34 #include <linux/in6.h>
36 #include <linux/sunrpc/clnt.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
38 #include <linux/sunrpc/metrics.h>
42 # define RPCDBG_FACILITY RPCDBG_CALL
45 #define dprint_status(t) \
46 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
47 __func__, t->tk_status)
50 * All RPC clients are linked into this list
52 static LIST_HEAD(all_clients);
53 static DEFINE_SPINLOCK(rpc_client_lock);
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 static void call_status(struct rpc_task *task);
67 static void call_transmit_status(struct rpc_task *task);
68 static void call_refresh(struct rpc_task *task);
69 static void call_refreshresult(struct rpc_task *task);
70 static void call_timeout(struct rpc_task *task);
71 static void call_connect(struct rpc_task *task);
72 static void call_connect_status(struct rpc_task *task);
74 static __be32 *rpc_encode_header(struct rpc_task *task);
75 static __be32 *rpc_verify_header(struct rpc_task *task);
76 static int rpc_ping(struct rpc_clnt *clnt, int flags);
78 static void rpc_register_client(struct rpc_clnt *clnt)
80 spin_lock(&rpc_client_lock);
81 list_add(&clnt->cl_clients, &all_clients);
82 spin_unlock(&rpc_client_lock);
85 static void rpc_unregister_client(struct rpc_clnt *clnt)
87 spin_lock(&rpc_client_lock);
88 list_del(&clnt->cl_clients);
89 spin_unlock(&rpc_client_lock);
93 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
95 static uint32_t clntid;
98 clnt->cl_vfsmnt = ERR_PTR(-ENOENT);
99 clnt->cl_dentry = ERR_PTR(-ENOENT);
100 if (dir_name == NULL)
103 clnt->cl_vfsmnt = rpc_get_mount();
104 if (IS_ERR(clnt->cl_vfsmnt))
105 return PTR_ERR(clnt->cl_vfsmnt);
108 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
109 "%s/clnt%x", dir_name,
110 (unsigned int)clntid++);
111 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
112 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
113 if (!IS_ERR(clnt->cl_dentry))
115 error = PTR_ERR(clnt->cl_dentry);
116 if (error != -EEXIST) {
117 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
118 clnt->cl_pathname, error);
125 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
127 struct rpc_program *program = args->program;
128 struct rpc_version *version;
129 struct rpc_clnt *clnt = NULL;
130 struct rpc_auth *auth;
134 /* sanity check the name before trying to print it */
136 len = strlen(args->servername);
137 if (len > RPC_MAXNETNAMELEN)
141 dprintk("RPC: creating %s client for %s (xprt %p)\n",
142 program->name, args->servername, xprt);
151 if (args->version >= program->nrvers)
153 version = program->version[args->version];
158 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
161 clnt->cl_parent = clnt;
163 clnt->cl_server = clnt->cl_inline_name;
164 if (len > sizeof(clnt->cl_inline_name)) {
165 char *buf = kmalloc(len, GFP_KERNEL);
167 clnt->cl_server = buf;
169 len = sizeof(clnt->cl_inline_name);
171 strlcpy(clnt->cl_server, args->servername, len);
173 clnt->cl_xprt = xprt;
174 clnt->cl_procinfo = version->procs;
175 clnt->cl_maxproc = version->nrprocs;
176 clnt->cl_protname = program->name;
177 clnt->cl_prog = program->number;
178 clnt->cl_vers = version->number;
179 clnt->cl_stats = program->stats;
180 clnt->cl_metrics = rpc_alloc_iostats(clnt);
182 if (clnt->cl_metrics == NULL)
184 clnt->cl_program = program;
185 INIT_LIST_HEAD(&clnt->cl_tasks);
186 spin_lock_init(&clnt->cl_lock);
188 if (!xprt_bound(clnt->cl_xprt))
189 clnt->cl_autobind = 1;
191 clnt->cl_timeout = xprt->timeout;
192 if (args->timeout != NULL) {
193 memcpy(&clnt->cl_timeout_default, args->timeout,
194 sizeof(clnt->cl_timeout_default));
195 clnt->cl_timeout = &clnt->cl_timeout_default;
198 clnt->cl_rtt = &clnt->cl_rtt_default;
199 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
201 kref_init(&clnt->cl_kref);
203 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
207 auth = rpcauth_create(args->authflavor, clnt);
209 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
215 /* save the nodename */
216 clnt->cl_nodelen = strlen(utsname()->nodename);
217 if (clnt->cl_nodelen > UNX_MAXNODENAME)
218 clnt->cl_nodelen = UNX_MAXNODENAME;
219 memcpy(clnt->cl_nodename, utsname()->nodename, clnt->cl_nodelen);
220 rpc_register_client(clnt);
224 if (!IS_ERR(clnt->cl_dentry)) {
225 rpc_rmdir(clnt->cl_dentry);
229 rpc_free_iostats(clnt->cl_metrics);
231 if (clnt->cl_server != clnt->cl_inline_name)
232 kfree(clnt->cl_server);
243 * rpc_create - create an RPC client and transport with one call
244 * @args: rpc_clnt create argument structure
246 * Creates and initializes an RPC transport and an RPC client.
248 * It can ping the server in order to determine if it is up, and to see if
249 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
250 * this behavior so asynchronous tasks can also use rpc_create.
252 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
254 struct rpc_xprt *xprt;
255 struct rpc_clnt *clnt;
256 struct xprt_create xprtargs = {
257 .ident = args->protocol,
258 .srcaddr = args->saddress,
259 .dstaddr = args->address,
260 .addrlen = args->addrsize,
265 * If the caller chooses not to specify a hostname, whip
266 * up a string representation of the passed-in address.
268 if (args->servername == NULL) {
269 servername[0] = '\0';
270 switch (args->address->sa_family) {
272 struct sockaddr_in *sin =
273 (struct sockaddr_in *)args->address;
274 snprintf(servername, sizeof(servername), NIPQUAD_FMT,
275 NIPQUAD(sin->sin_addr.s_addr));
279 struct sockaddr_in6 *sin =
280 (struct sockaddr_in6 *)args->address;
281 snprintf(servername, sizeof(servername), NIP6_FMT,
282 NIP6(sin->sin6_addr));
286 /* caller wants default server name, but
287 * address family isn't recognized. */
288 return ERR_PTR(-EINVAL);
290 args->servername = servername;
293 xprt = xprt_create_transport(&xprtargs);
295 return (struct rpc_clnt *)xprt;
298 * By default, kernel RPC client connects from a reserved port.
299 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
300 * but it is always enabled for rpciod, which handles the connect
304 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
307 clnt = rpc_new_client(args, xprt);
311 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
312 int err = rpc_ping(clnt, RPC_TASK_SOFT);
314 rpc_shutdown_client(clnt);
319 clnt->cl_softrtry = 1;
320 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
321 clnt->cl_softrtry = 0;
323 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
324 clnt->cl_autobind = 1;
325 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
326 clnt->cl_discrtry = 1;
330 EXPORT_SYMBOL_GPL(rpc_create);
333 * This function clones the RPC client structure. It allows us to share the
334 * same transport while varying parameters such as the authentication
338 rpc_clone_client(struct rpc_clnt *clnt)
340 struct rpc_clnt *new;
343 new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
346 new->cl_parent = clnt;
347 /* Turn off autobind on clones */
348 new->cl_autobind = 0;
349 INIT_LIST_HEAD(&new->cl_tasks);
350 spin_lock_init(&new->cl_lock);
351 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval);
352 new->cl_metrics = rpc_alloc_iostats(clnt);
353 if (new->cl_metrics == NULL)
355 kref_init(&new->cl_kref);
356 err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
360 atomic_inc(&new->cl_auth->au_count);
361 xprt_get(clnt->cl_xprt);
362 kref_get(&clnt->cl_kref);
363 rpc_register_client(new);
367 rpc_free_iostats(new->cl_metrics);
371 dprintk("RPC: %s: returned error %d\n", __func__, err);
374 EXPORT_SYMBOL_GPL(rpc_clone_client);
377 * Properly shut down an RPC client, terminating all outstanding
380 void rpc_shutdown_client(struct rpc_clnt *clnt)
382 dprintk("RPC: shutting down %s client for %s\n",
383 clnt->cl_protname, clnt->cl_server);
385 while (!list_empty(&clnt->cl_tasks)) {
386 rpc_killall_tasks(clnt);
387 wait_event_timeout(destroy_wait,
388 list_empty(&clnt->cl_tasks), 1*HZ);
391 rpc_release_client(clnt);
393 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
399 rpc_free_client(struct kref *kref)
401 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
403 dprintk("RPC: destroying %s client for %s\n",
404 clnt->cl_protname, clnt->cl_server);
405 if (!IS_ERR(clnt->cl_dentry)) {
406 rpc_rmdir(clnt->cl_dentry);
409 if (clnt->cl_parent != clnt) {
410 rpc_release_client(clnt->cl_parent);
413 if (clnt->cl_server != clnt->cl_inline_name)
414 kfree(clnt->cl_server);
416 rpc_unregister_client(clnt);
417 rpc_free_iostats(clnt->cl_metrics);
418 clnt->cl_metrics = NULL;
419 xprt_put(clnt->cl_xprt);
428 rpc_free_auth(struct kref *kref)
430 struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
432 if (clnt->cl_auth == NULL) {
433 rpc_free_client(kref);
438 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
439 * release remaining GSS contexts. This mechanism ensures
440 * that it can do so safely.
443 rpcauth_release(clnt->cl_auth);
444 clnt->cl_auth = NULL;
445 kref_put(kref, rpc_free_client);
449 * Release reference to the RPC client
452 rpc_release_client(struct rpc_clnt *clnt)
454 dprintk("RPC: rpc_release_client(%p)\n", clnt);
456 if (list_empty(&clnt->cl_tasks))
457 wake_up(&destroy_wait);
458 kref_put(&clnt->cl_kref, rpc_free_auth);
462 * rpc_bind_new_program - bind a new RPC program to an existing client
463 * @old: old rpc_client
464 * @program: rpc program to set
465 * @vers: rpc program version
467 * Clones the rpc client and sets up a new RPC program. This is mainly
468 * of use for enabling different RPC programs to share the same transport.
469 * The Sun NFSv2/v3 ACL protocol can do this.
471 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
472 struct rpc_program *program,
475 struct rpc_clnt *clnt;
476 struct rpc_version *version;
479 BUG_ON(vers >= program->nrvers || !program->version[vers]);
480 version = program->version[vers];
481 clnt = rpc_clone_client(old);
484 clnt->cl_procinfo = version->procs;
485 clnt->cl_maxproc = version->nrprocs;
486 clnt->cl_protname = program->name;
487 clnt->cl_prog = program->number;
488 clnt->cl_vers = version->number;
489 clnt->cl_stats = program->stats;
490 err = rpc_ping(clnt, RPC_TASK_SOFT);
492 rpc_shutdown_client(clnt);
498 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
501 * Default callback for async RPC calls
504 rpc_default_callback(struct rpc_task *task, void *data)
508 static const struct rpc_call_ops rpc_default_ops = {
509 .rpc_call_done = rpc_default_callback,
513 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
514 * @task_setup_data: pointer to task initialisation data
516 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
518 struct rpc_task *task, *ret;
520 task = rpc_new_task(task_setup_data);
522 rpc_release_calldata(task_setup_data->callback_ops,
523 task_setup_data->callback_data);
524 ret = ERR_PTR(-ENOMEM);
528 if (task->tk_status != 0) {
529 ret = ERR_PTR(task->tk_status);
533 atomic_inc(&task->tk_count);
539 EXPORT_SYMBOL_GPL(rpc_run_task);
542 * rpc_call_sync - Perform a synchronous RPC call
543 * @clnt: pointer to RPC client
544 * @msg: RPC call parameters
545 * @flags: RPC call flags
547 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
549 struct rpc_task *task;
550 struct rpc_task_setup task_setup_data = {
553 .callback_ops = &rpc_default_ops,
558 BUG_ON(flags & RPC_TASK_ASYNC);
560 task = rpc_run_task(&task_setup_data);
562 return PTR_ERR(task);
563 status = task->tk_status;
567 EXPORT_SYMBOL_GPL(rpc_call_sync);
570 * rpc_call_async - Perform an asynchronous RPC call
571 * @clnt: pointer to RPC client
572 * @msg: RPC call parameters
573 * @flags: RPC call flags
574 * @tk_ops: RPC call ops
575 * @data: user call data
578 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
579 const struct rpc_call_ops *tk_ops, void *data)
581 struct rpc_task *task;
582 struct rpc_task_setup task_setup_data = {
585 .callback_ops = tk_ops,
586 .callback_data = data,
587 .flags = flags|RPC_TASK_ASYNC,
590 task = rpc_run_task(&task_setup_data);
592 return PTR_ERR(task);
596 EXPORT_SYMBOL_GPL(rpc_call_async);
599 rpc_call_start(struct rpc_task *task)
601 task->tk_action = call_start;
603 EXPORT_SYMBOL_GPL(rpc_call_start);
606 * rpc_peeraddr - extract remote peer address from clnt's xprt
607 * @clnt: RPC client structure
608 * @buf: target buffer
609 * @bufsize: length of target buffer
611 * Returns the number of bytes that are actually in the stored address.
613 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
616 struct rpc_xprt *xprt = clnt->cl_xprt;
618 bytes = sizeof(xprt->addr);
621 memcpy(buf, &clnt->cl_xprt->addr, bytes);
622 return xprt->addrlen;
624 EXPORT_SYMBOL_GPL(rpc_peeraddr);
627 * rpc_peeraddr2str - return remote peer address in printable format
628 * @clnt: RPC client structure
629 * @format: address format
632 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
633 enum rpc_display_format_t format)
635 struct rpc_xprt *xprt = clnt->cl_xprt;
637 if (xprt->address_strings[format] != NULL)
638 return xprt->address_strings[format];
640 return "unprintable";
642 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
645 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
647 struct rpc_xprt *xprt = clnt->cl_xprt;
648 if (xprt->ops->set_buffer_size)
649 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
651 EXPORT_SYMBOL_GPL(rpc_setbufsize);
654 * Return size of largest payload RPC client can support, in bytes
656 * For stream transports, this is one RPC record fragment (see RFC
657 * 1831), as we don't support multi-record requests yet. For datagram
658 * transports, this is the size of an IP packet minus the IP, UDP, and
661 size_t rpc_max_payload(struct rpc_clnt *clnt)
663 return clnt->cl_xprt->max_payload;
665 EXPORT_SYMBOL_GPL(rpc_max_payload);
668 * rpc_force_rebind - force transport to check that remote port is unchanged
669 * @clnt: client to rebind
672 void rpc_force_rebind(struct rpc_clnt *clnt)
674 if (clnt->cl_autobind)
675 xprt_clear_bound(clnt->cl_xprt);
677 EXPORT_SYMBOL_GPL(rpc_force_rebind);
680 * Restart an (async) RPC call. Usually called from within the
684 rpc_restart_call(struct rpc_task *task)
686 if (RPC_ASSASSINATED(task))
689 task->tk_action = call_start;
691 EXPORT_SYMBOL_GPL(rpc_restart_call);
694 static const char *rpc_proc_name(const struct rpc_task *task)
696 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
711 * Other FSM states can be visited zero or more times, but
712 * this state is visited exactly once for each RPC.
715 call_start(struct rpc_task *task)
717 struct rpc_clnt *clnt = task->tk_client;
719 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
720 clnt->cl_protname, clnt->cl_vers,
722 (RPC_IS_ASYNC(task) ? "async" : "sync"));
724 /* Increment call count */
725 task->tk_msg.rpc_proc->p_count++;
726 clnt->cl_stats->rpccnt++;
727 task->tk_action = call_reserve;
731 * 1. Reserve an RPC call slot
734 call_reserve(struct rpc_task *task)
738 if (!rpcauth_uptodatecred(task)) {
739 task->tk_action = call_refresh;
744 task->tk_action = call_reserveresult;
749 * 1b. Grok the result of xprt_reserve()
752 call_reserveresult(struct rpc_task *task)
754 int status = task->tk_status;
759 * After a call to xprt_reserve(), we must have either
760 * a request slot or else an error status.
764 if (task->tk_rqstp) {
765 task->tk_action = call_allocate;
769 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
771 rpc_exit(task, -EIO);
776 * Even though there was an error, we may have acquired
777 * a request slot somehow. Make sure not to leak it.
779 if (task->tk_rqstp) {
780 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
786 case -EAGAIN: /* woken up; retry */
787 task->tk_action = call_reserve;
789 case -EIO: /* probably a shutdown */
792 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
796 rpc_exit(task, status);
800 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
801 * (Note: buffer memory is freed in xprt_release).
804 call_allocate(struct rpc_task *task)
806 unsigned int slack = task->tk_msg.rpc_cred->cr_auth->au_cslack;
807 struct rpc_rqst *req = task->tk_rqstp;
808 struct rpc_xprt *xprt = task->tk_xprt;
809 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
814 task->tk_action = call_bind;
819 if (proc->p_proc != 0) {
820 BUG_ON(proc->p_arglen == 0);
821 if (proc->p_decode != NULL)
822 BUG_ON(proc->p_replen == 0);
826 * Calculate the size (in quads) of the RPC call
827 * and reply headers, and convert both values
830 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
831 req->rq_callsize <<= 2;
832 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
833 req->rq_rcvsize <<= 2;
835 req->rq_buffer = xprt->ops->buf_alloc(task,
836 req->rq_callsize + req->rq_rcvsize);
837 if (req->rq_buffer != NULL)
840 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
842 if (RPC_IS_ASYNC(task) || !signalled()) {
843 task->tk_action = call_allocate;
844 rpc_delay(task, HZ>>4);
848 rpc_exit(task, -ERESTARTSYS);
852 rpc_task_need_encode(struct rpc_task *task)
854 return task->tk_rqstp->rq_snd_buf.len == 0;
858 rpc_task_force_reencode(struct rpc_task *task)
860 task->tk_rqstp->rq_snd_buf.len = 0;
864 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
866 buf->head[0].iov_base = start;
867 buf->head[0].iov_len = len;
868 buf->tail[0].iov_len = 0;
876 * 3. Encode arguments of an RPC call
879 rpc_xdr_encode(struct rpc_task *task)
881 struct rpc_rqst *req = task->tk_rqstp;
887 rpc_xdr_buf_init(&req->rq_snd_buf,
890 rpc_xdr_buf_init(&req->rq_rcv_buf,
891 (char *)req->rq_buffer + req->rq_callsize,
894 p = rpc_encode_header(task);
896 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
897 rpc_exit(task, -EIO);
901 encode = task->tk_msg.rpc_proc->p_encode;
905 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
906 task->tk_msg.rpc_argp);
910 * 4. Get the server port number if not yet set
913 call_bind(struct rpc_task *task)
915 struct rpc_xprt *xprt = task->tk_xprt;
919 task->tk_action = call_connect;
920 if (!xprt_bound(xprt)) {
921 task->tk_action = call_bind_status;
922 task->tk_timeout = xprt->bind_timeout;
923 xprt->ops->rpcbind(task);
928 * 4a. Sort out bind result
931 call_bind_status(struct rpc_task *task)
935 if (task->tk_status >= 0) {
938 task->tk_action = call_connect;
942 switch (task->tk_status) {
944 dprintk("RPC: %5u rpcbind waiting for another request "
945 "to finish\n", task->tk_pid);
946 /* avoid busy-waiting here -- could be a network outage. */
947 rpc_delay(task, 5*HZ);
950 dprintk("RPC: %5u remote rpcbind: RPC program/version "
951 "unavailable\n", task->tk_pid);
952 /* fail immediately if this is an RPC ping */
953 if (task->tk_msg.rpc_proc->p_proc == 0) {
954 status = -EOPNOTSUPP;
957 rpc_delay(task, 3*HZ);
960 dprintk("RPC: %5u rpcbind request timed out\n",
964 /* server doesn't support any rpcbind version we know of */
965 dprintk("RPC: %5u remote rpcbind service unavailable\n",
968 case -EPROTONOSUPPORT:
969 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
972 task->tk_action = call_bind;
975 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
976 task->tk_pid, -task->tk_status);
979 rpc_exit(task, status);
983 task->tk_action = call_timeout;
987 * 4b. Connect to the RPC server
990 call_connect(struct rpc_task *task)
992 struct rpc_xprt *xprt = task->tk_xprt;
994 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
996 (xprt_connected(xprt) ? "is" : "is not"));
998 task->tk_action = call_transmit;
999 if (!xprt_connected(xprt)) {
1000 task->tk_action = call_connect_status;
1001 if (task->tk_status < 0)
1008 * 4c. Sort out connect result
1011 call_connect_status(struct rpc_task *task)
1013 struct rpc_clnt *clnt = task->tk_client;
1014 int status = task->tk_status;
1016 dprint_status(task);
1018 task->tk_status = 0;
1020 clnt->cl_stats->netreconn++;
1021 task->tk_action = call_transmit;
1025 /* Something failed: remote service port may have changed */
1026 rpc_force_rebind(clnt);
1031 task->tk_action = call_bind;
1032 if (!RPC_IS_SOFT(task))
1034 /* if soft mounted, test if we've timed out */
1036 task->tk_action = call_timeout;
1039 rpc_exit(task, -EIO);
1043 * 5. Transmit the RPC request, and wait for reply
1046 call_transmit(struct rpc_task *task)
1048 dprint_status(task);
1050 task->tk_action = call_status;
1051 if (task->tk_status < 0)
1053 task->tk_status = xprt_prepare_transmit(task);
1054 if (task->tk_status != 0)
1056 task->tk_action = call_transmit_status;
1057 /* Encode here so that rpcsec_gss can use correct sequence number. */
1058 if (rpc_task_need_encode(task)) {
1059 BUG_ON(task->tk_rqstp->rq_bytes_sent != 0);
1060 rpc_xdr_encode(task);
1061 /* Did the encode result in an error condition? */
1062 if (task->tk_status != 0) {
1063 /* Was the error nonfatal? */
1064 if (task->tk_status == -EAGAIN)
1065 rpc_delay(task, HZ >> 4);
1067 rpc_exit(task, task->tk_status);
1071 xprt_transmit(task);
1072 if (task->tk_status < 0)
1075 * On success, ensure that we call xprt_end_transmit() before sleeping
1076 * in order to allow access to the socket to other RPC requests.
1078 call_transmit_status(task);
1079 if (task->tk_msg.rpc_proc->p_decode != NULL)
1081 task->tk_action = rpc_exit_task;
1082 rpc_wake_up_queued_task(&task->tk_xprt->pending, task);
1086 * 5a. Handle cleanup after a transmission
1089 call_transmit_status(struct rpc_task *task)
1091 task->tk_action = call_status;
1093 * Special case: if we've been waiting on the socket's write_space()
1094 * callback, then don't call xprt_end_transmit().
1096 if (task->tk_status == -EAGAIN)
1098 xprt_end_transmit(task);
1099 rpc_task_force_reencode(task);
1103 * 6. Sort out the RPC call status
1106 call_status(struct rpc_task *task)
1108 struct rpc_clnt *clnt = task->tk_client;
1109 struct rpc_rqst *req = task->tk_rqstp;
1112 if (req->rq_received > 0 && !req->rq_bytes_sent)
1113 task->tk_status = req->rq_received;
1115 dprint_status(task);
1117 status = task->tk_status;
1119 task->tk_action = call_decode;
1123 task->tk_status = 0;
1129 * Delay any retries for 3 seconds, then handle as if it
1132 rpc_delay(task, 3*HZ);
1134 task->tk_action = call_timeout;
1135 if (task->tk_client->cl_discrtry)
1136 xprt_conditional_disconnect(task->tk_xprt,
1137 req->rq_connect_cookie);
1141 rpc_force_rebind(clnt);
1142 task->tk_action = call_bind;
1145 task->tk_action = call_transmit;
1148 /* shutdown or soft timeout */
1149 rpc_exit(task, status);
1152 printk("%s: RPC call returned error %d\n",
1153 clnt->cl_protname, -status);
1154 rpc_exit(task, status);
1159 * 6a. Handle RPC timeout
1160 * We do not release the request slot, so we keep using the
1161 * same XID for all retransmits.
1164 call_timeout(struct rpc_task *task)
1166 struct rpc_clnt *clnt = task->tk_client;
1168 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1169 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1173 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1174 task->tk_timeouts++;
1176 if (RPC_IS_SOFT(task)) {
1177 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1178 clnt->cl_protname, clnt->cl_server);
1179 rpc_exit(task, -EIO);
1183 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1184 task->tk_flags |= RPC_CALL_MAJORSEEN;
1185 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1186 clnt->cl_protname, clnt->cl_server);
1188 rpc_force_rebind(clnt);
1190 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1191 * event? RFC2203 requires the server to drop all such requests.
1193 rpcauth_invalcred(task);
1196 clnt->cl_stats->rpcretrans++;
1197 task->tk_action = call_bind;
1198 task->tk_status = 0;
1202 * 7. Decode the RPC reply
1205 call_decode(struct rpc_task *task)
1207 struct rpc_clnt *clnt = task->tk_client;
1208 struct rpc_rqst *req = task->tk_rqstp;
1209 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
1212 dprintk("RPC: %5u call_decode (status %d)\n",
1213 task->tk_pid, task->tk_status);
1215 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1216 printk(KERN_NOTICE "%s: server %s OK\n",
1217 clnt->cl_protname, clnt->cl_server);
1218 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1222 * Ensure that we see all writes made by xprt_complete_rqst()
1223 * before it changed req->rq_received.
1226 req->rq_rcv_buf.len = req->rq_private_buf.len;
1228 /* Check that the softirq receive buffer is valid */
1229 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1230 sizeof(req->rq_rcv_buf)) != 0);
1232 if (req->rq_rcv_buf.len < 12) {
1233 if (!RPC_IS_SOFT(task)) {
1234 task->tk_action = call_bind;
1235 clnt->cl_stats->rpcretrans++;
1238 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1239 clnt->cl_protname, task->tk_status);
1240 task->tk_action = call_timeout;
1244 p = rpc_verify_header(task);
1246 if (p == ERR_PTR(-EAGAIN))
1251 task->tk_action = rpc_exit_task;
1254 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1255 task->tk_msg.rpc_resp);
1257 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
1261 task->tk_status = 0;
1262 /* Note: rpc_verify_header() may have freed the RPC slot */
1263 if (task->tk_rqstp == req) {
1264 req->rq_received = req->rq_rcv_buf.len = 0;
1265 if (task->tk_client->cl_discrtry)
1266 xprt_conditional_disconnect(task->tk_xprt,
1267 req->rq_connect_cookie);
1272 * 8. Refresh the credentials if rejected by the server
1275 call_refresh(struct rpc_task *task)
1277 dprint_status(task);
1279 task->tk_action = call_refreshresult;
1280 task->tk_status = 0;
1281 task->tk_client->cl_stats->rpcauthrefresh++;
1282 rpcauth_refreshcred(task);
1286 * 8a. Process the results of a credential refresh
1289 call_refreshresult(struct rpc_task *task)
1291 int status = task->tk_status;
1293 dprint_status(task);
1295 task->tk_status = 0;
1296 task->tk_action = call_reserve;
1297 if (status >= 0 && rpcauth_uptodatecred(task))
1299 if (status == -EACCES) {
1300 rpc_exit(task, -EACCES);
1303 task->tk_action = call_refresh;
1304 if (status != -ETIMEDOUT)
1305 rpc_delay(task, 3*HZ);
1310 rpc_encode_header(struct rpc_task *task)
1312 struct rpc_clnt *clnt = task->tk_client;
1313 struct rpc_rqst *req = task->tk_rqstp;
1314 __be32 *p = req->rq_svec[0].iov_base;
1316 /* FIXME: check buffer size? */
1318 p = xprt_skip_transport_header(task->tk_xprt, p);
1319 *p++ = req->rq_xid; /* XID */
1320 *p++ = htonl(RPC_CALL); /* CALL */
1321 *p++ = htonl(RPC_VERSION); /* RPC version */
1322 *p++ = htonl(clnt->cl_prog); /* program number */
1323 *p++ = htonl(clnt->cl_vers); /* program version */
1324 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
1325 p = rpcauth_marshcred(task, p);
1326 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
1331 rpc_verify_header(struct rpc_task *task)
1333 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
1334 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
1335 __be32 *p = iov->iov_base;
1337 int error = -EACCES;
1339 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
1340 /* RFC-1014 says that the representation of XDR data must be a
1341 * multiple of four bytes
1342 * - if it isn't pointer subtraction in the NFS client may give
1345 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1346 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
1347 task->tk_rqstp->rq_rcv_buf.len);
1352 p += 1; /* skip XID */
1354 if ((n = ntohl(*p++)) != RPC_REPLY) {
1355 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1356 task->tk_pid, __func__, n);
1359 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
1362 switch ((n = ntohl(*p++))) {
1363 case RPC_AUTH_ERROR:
1366 dprintk("RPC: %5u %s: RPC call version "
1368 task->tk_pid, __func__);
1369 error = -EPROTONOSUPPORT;
1372 dprintk("RPC: %5u %s: RPC call rejected, "
1373 "unknown error: %x\n",
1374 task->tk_pid, __func__, n);
1379 switch ((n = ntohl(*p++))) {
1380 case RPC_AUTH_REJECTEDCRED:
1381 case RPC_AUTH_REJECTEDVERF:
1382 case RPCSEC_GSS_CREDPROBLEM:
1383 case RPCSEC_GSS_CTXPROBLEM:
1384 if (!task->tk_cred_retry)
1386 task->tk_cred_retry--;
1387 dprintk("RPC: %5u %s: retry stale creds\n",
1388 task->tk_pid, __func__);
1389 rpcauth_invalcred(task);
1390 /* Ensure we obtain a new XID! */
1392 task->tk_action = call_refresh;
1394 case RPC_AUTH_BADCRED:
1395 case RPC_AUTH_BADVERF:
1396 /* possibly garbled cred/verf? */
1397 if (!task->tk_garb_retry)
1399 task->tk_garb_retry--;
1400 dprintk("RPC: %5u %s: retry garbled creds\n",
1401 task->tk_pid, __func__);
1402 task->tk_action = call_bind;
1404 case RPC_AUTH_TOOWEAK:
1405 printk(KERN_NOTICE "RPC: server %s requires stronger "
1406 "authentication.\n", task->tk_client->cl_server);
1409 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1410 task->tk_pid, __func__, n);
1413 dprintk("RPC: %5u %s: call rejected %d\n",
1414 task->tk_pid, __func__, n);
1417 if (!(p = rpcauth_checkverf(task, p))) {
1418 dprintk("RPC: %5u %s: auth check failed\n",
1419 task->tk_pid, __func__);
1420 goto out_garbage; /* bad verifier, retry */
1422 len = p - (__be32 *)iov->iov_base - 1;
1425 switch ((n = ntohl(*p++))) {
1428 case RPC_PROG_UNAVAIL:
1429 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1430 task->tk_pid, __func__,
1431 (unsigned int)task->tk_client->cl_prog,
1432 task->tk_client->cl_server);
1433 error = -EPFNOSUPPORT;
1435 case RPC_PROG_MISMATCH:
1436 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1437 "server %s\n", task->tk_pid, __func__,
1438 (unsigned int)task->tk_client->cl_prog,
1439 (unsigned int)task->tk_client->cl_vers,
1440 task->tk_client->cl_server);
1441 error = -EPROTONOSUPPORT;
1443 case RPC_PROC_UNAVAIL:
1444 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1445 "version %u on server %s\n",
1446 task->tk_pid, __func__,
1447 rpc_proc_name(task),
1448 task->tk_client->cl_prog,
1449 task->tk_client->cl_vers,
1450 task->tk_client->cl_server);
1451 error = -EOPNOTSUPP;
1453 case RPC_GARBAGE_ARGS:
1454 dprintk("RPC: %5u %s: server saw garbage\n",
1455 task->tk_pid, __func__);
1458 dprintk("RPC: %5u %s: server accept status: %x\n",
1459 task->tk_pid, __func__, n);
1464 task->tk_client->cl_stats->rpcgarbage++;
1465 if (task->tk_garb_retry) {
1466 task->tk_garb_retry--;
1467 dprintk("RPC: %5u %s: retrying\n",
1468 task->tk_pid, __func__);
1469 task->tk_action = call_bind;
1471 return ERR_PTR(-EAGAIN);
1476 rpc_exit(task, error);
1477 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
1479 return ERR_PTR(error);
1481 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
1486 static int rpcproc_encode_null(void *rqstp, __be32 *data, void *obj)
1491 static int rpcproc_decode_null(void *rqstp, __be32 *data, void *obj)
1496 static struct rpc_procinfo rpcproc_null = {
1497 .p_encode = rpcproc_encode_null,
1498 .p_decode = rpcproc_decode_null,
1501 static int rpc_ping(struct rpc_clnt *clnt, int flags)
1503 struct rpc_message msg = {
1504 .rpc_proc = &rpcproc_null,
1507 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
1508 err = rpc_call_sync(clnt, &msg, flags);
1509 put_rpccred(msg.rpc_cred);
1513 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
1515 struct rpc_message msg = {
1516 .rpc_proc = &rpcproc_null,
1519 struct rpc_task_setup task_setup_data = {
1521 .rpc_message = &msg,
1522 .callback_ops = &rpc_default_ops,
1525 return rpc_run_task(&task_setup_data);
1527 EXPORT_SYMBOL_GPL(rpc_call_null);
1530 static void rpc_show_header(void)
1532 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
1533 "-timeout ---ops--\n");
1536 static void rpc_show_task(const struct rpc_clnt *clnt,
1537 const struct rpc_task *task)
1539 const char *rpc_waitq = "none";
1540 char *p, action[KSYM_SYMBOL_LEN];
1542 if (RPC_IS_QUEUED(task))
1543 rpc_waitq = rpc_qname(task->tk_waitqueue);
1545 /* map tk_action pointer to a function name; then trim off
1546 * the "+0x0 [sunrpc]" */
1547 sprint_symbol(action, (unsigned long)task->tk_action);
1548 p = strchr(action, '+');
1552 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%s q:%s\n",
1553 task->tk_pid, task->tk_flags, task->tk_status,
1554 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
1555 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
1559 void rpc_show_tasks(void)
1561 struct rpc_clnt *clnt;
1562 struct rpc_task *task;
1565 spin_lock(&rpc_client_lock);
1566 list_for_each_entry(clnt, &all_clients, cl_clients) {
1567 spin_lock(&clnt->cl_lock);
1568 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
1573 rpc_show_task(clnt, task);
1575 spin_unlock(&clnt->cl_lock);
1577 spin_unlock(&rpc_client_lock);