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
= {
288 .ident
= args
->protocol
,
289 .srcaddr
= args
->saddress
,
290 .dstaddr
= args
->address
,
291 .addrlen
= args
->addrsize
,
292 .bc_xprt
= args
->bc_xprt
,
297 * If the caller chooses not to specify a hostname, whip
298 * up a string representation of the passed-in address.
300 if (args
->servername
== NULL
) {
301 struct sockaddr_in
*sin
=
302 (struct sockaddr_in
*)args
->address
;
303 struct sockaddr_in6
*sin6
=
304 (struct sockaddr_in6
*)args
->address
;
306 servername
[0] = '\0';
307 switch (args
->address
->sa_family
) {
309 snprintf(servername
, sizeof(servername
), "%pI4",
310 &sin
->sin_addr
.s_addr
);
313 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 if (RPC_IS_QUEUED(rovr
))
439 rpc_wake_up_queued_task(rovr
->tk_waitqueue
,
443 spin_unlock(&clnt
->cl_lock
);
445 EXPORT_SYMBOL_GPL(rpc_killall_tasks
);
448 * Properly shut down an RPC client, terminating all outstanding
451 void rpc_shutdown_client(struct rpc_clnt
*clnt
)
453 dprintk("RPC: shutting down %s client for %s\n",
454 clnt
->cl_protname
, clnt
->cl_server
);
456 while (!list_empty(&clnt
->cl_tasks
)) {
457 rpc_killall_tasks(clnt
);
458 wait_event_timeout(destroy_wait
,
459 list_empty(&clnt
->cl_tasks
), 1*HZ
);
462 rpc_release_client(clnt
);
464 EXPORT_SYMBOL_GPL(rpc_shutdown_client
);
470 rpc_free_client(struct rpc_clnt
*clnt
)
472 dprintk("RPC: destroying %s client for %s\n",
473 clnt
->cl_protname
, clnt
->cl_server
);
474 if (!IS_ERR(clnt
->cl_path
.dentry
)) {
475 rpc_remove_client_dir(clnt
->cl_path
.dentry
);
478 if (clnt
->cl_parent
!= clnt
) {
479 rpc_release_client(clnt
->cl_parent
);
482 if (clnt
->cl_server
!= clnt
->cl_inline_name
)
483 kfree(clnt
->cl_server
);
485 rpc_unregister_client(clnt
);
486 rpc_free_iostats(clnt
->cl_metrics
);
487 kfree(clnt
->cl_principal
);
488 clnt
->cl_metrics
= NULL
;
489 xprt_put(clnt
->cl_xprt
);
498 rpc_free_auth(struct rpc_clnt
*clnt
)
500 if (clnt
->cl_auth
== NULL
) {
501 rpc_free_client(clnt
);
506 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
507 * release remaining GSS contexts. This mechanism ensures
508 * that it can do so safely.
510 atomic_inc(&clnt
->cl_count
);
511 rpcauth_release(clnt
->cl_auth
);
512 clnt
->cl_auth
= NULL
;
513 if (atomic_dec_and_test(&clnt
->cl_count
))
514 rpc_free_client(clnt
);
518 * Release reference to the RPC client
521 rpc_release_client(struct rpc_clnt
*clnt
)
523 dprintk("RPC: rpc_release_client(%p)\n", clnt
);
525 if (list_empty(&clnt
->cl_tasks
))
526 wake_up(&destroy_wait
);
527 if (atomic_dec_and_test(&clnt
->cl_count
))
532 * rpc_bind_new_program - bind a new RPC program to an existing client
533 * @old: old rpc_client
534 * @program: rpc program to set
535 * @vers: rpc program version
537 * Clones the rpc client and sets up a new RPC program. This is mainly
538 * of use for enabling different RPC programs to share the same transport.
539 * The Sun NFSv2/v3 ACL protocol can do this.
541 struct rpc_clnt
*rpc_bind_new_program(struct rpc_clnt
*old
,
542 struct rpc_program
*program
,
545 struct rpc_clnt
*clnt
;
546 struct rpc_version
*version
;
549 BUG_ON(vers
>= program
->nrvers
|| !program
->version
[vers
]);
550 version
= program
->version
[vers
];
551 clnt
= rpc_clone_client(old
);
554 clnt
->cl_procinfo
= version
->procs
;
555 clnt
->cl_maxproc
= version
->nrprocs
;
556 clnt
->cl_protname
= program
->name
;
557 clnt
->cl_prog
= program
->number
;
558 clnt
->cl_vers
= version
->number
;
559 clnt
->cl_stats
= program
->stats
;
560 err
= rpc_ping(clnt
);
562 rpc_shutdown_client(clnt
);
568 EXPORT_SYMBOL_GPL(rpc_bind_new_program
);
570 void rpc_task_release_client(struct rpc_task
*task
)
572 struct rpc_clnt
*clnt
= task
->tk_client
;
575 /* Remove from client task list */
576 spin_lock(&clnt
->cl_lock
);
577 list_del(&task
->tk_task
);
578 spin_unlock(&clnt
->cl_lock
);
579 task
->tk_client
= NULL
;
581 rpc_release_client(clnt
);
586 void rpc_task_set_client(struct rpc_task
*task
, struct rpc_clnt
*clnt
)
589 rpc_task_release_client(task
);
590 task
->tk_client
= clnt
;
591 atomic_inc(&clnt
->cl_count
);
592 if (clnt
->cl_softrtry
)
593 task
->tk_flags
|= RPC_TASK_SOFT
;
594 /* Add to the client's list of all tasks */
595 spin_lock(&clnt
->cl_lock
);
596 list_add_tail(&task
->tk_task
, &clnt
->cl_tasks
);
597 spin_unlock(&clnt
->cl_lock
);
601 void rpc_task_reset_client(struct rpc_task
*task
, struct rpc_clnt
*clnt
)
603 rpc_task_release_client(task
);
604 rpc_task_set_client(task
, clnt
);
606 EXPORT_SYMBOL_GPL(rpc_task_reset_client
);
610 rpc_task_set_rpc_message(struct rpc_task
*task
, const struct rpc_message
*msg
)
613 task
->tk_msg
.rpc_proc
= msg
->rpc_proc
;
614 task
->tk_msg
.rpc_argp
= msg
->rpc_argp
;
615 task
->tk_msg
.rpc_resp
= msg
->rpc_resp
;
616 if (msg
->rpc_cred
!= NULL
)
617 task
->tk_msg
.rpc_cred
= get_rpccred(msg
->rpc_cred
);
622 * Default callback for async RPC calls
625 rpc_default_callback(struct rpc_task
*task
, void *data
)
629 static const struct rpc_call_ops rpc_default_ops
= {
630 .rpc_call_done
= rpc_default_callback
,
634 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
635 * @task_setup_data: pointer to task initialisation data
637 struct rpc_task
*rpc_run_task(const struct rpc_task_setup
*task_setup_data
)
639 struct rpc_task
*task
;
641 task
= rpc_new_task(task_setup_data
);
645 rpc_task_set_client(task
, task_setup_data
->rpc_client
);
646 rpc_task_set_rpc_message(task
, task_setup_data
->rpc_message
);
648 if (task
->tk_action
== NULL
)
649 rpc_call_start(task
);
651 atomic_inc(&task
->tk_count
);
656 EXPORT_SYMBOL_GPL(rpc_run_task
);
659 * rpc_call_sync - Perform a synchronous RPC call
660 * @clnt: pointer to RPC client
661 * @msg: RPC call parameters
662 * @flags: RPC call flags
664 int rpc_call_sync(struct rpc_clnt
*clnt
, const struct rpc_message
*msg
, int flags
)
666 struct rpc_task
*task
;
667 struct rpc_task_setup task_setup_data
= {
670 .callback_ops
= &rpc_default_ops
,
675 BUG_ON(flags
& RPC_TASK_ASYNC
);
677 task
= rpc_run_task(&task_setup_data
);
679 return PTR_ERR(task
);
680 status
= task
->tk_status
;
684 EXPORT_SYMBOL_GPL(rpc_call_sync
);
687 * rpc_call_async - Perform an asynchronous RPC call
688 * @clnt: pointer to RPC client
689 * @msg: RPC call parameters
690 * @flags: RPC call flags
691 * @tk_ops: RPC call ops
692 * @data: user call data
695 rpc_call_async(struct rpc_clnt
*clnt
, const struct rpc_message
*msg
, int flags
,
696 const struct rpc_call_ops
*tk_ops
, void *data
)
698 struct rpc_task
*task
;
699 struct rpc_task_setup task_setup_data
= {
702 .callback_ops
= tk_ops
,
703 .callback_data
= data
,
704 .flags
= flags
|RPC_TASK_ASYNC
,
707 task
= rpc_run_task(&task_setup_data
);
709 return PTR_ERR(task
);
713 EXPORT_SYMBOL_GPL(rpc_call_async
);
715 #if defined(CONFIG_NFS_V4_1)
717 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
718 * rpc_execute against it
720 * @tk_ops: RPC call ops
722 struct rpc_task
*rpc_run_bc_task(struct rpc_rqst
*req
,
723 const struct rpc_call_ops
*tk_ops
)
725 struct rpc_task
*task
;
726 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
727 struct rpc_task_setup task_setup_data
= {
728 .callback_ops
= tk_ops
,
731 dprintk("RPC: rpc_run_bc_task req= %p\n", req
);
733 * Create an rpc_task to send the data
735 task
= rpc_new_task(&task_setup_data
);
737 xprt_free_bc_request(req
);
740 task
->tk_rqstp
= req
;
743 * Set up the xdr_buf length.
744 * This also indicates that the buffer is XDR encoded already.
746 xbufp
->len
= xbufp
->head
[0].iov_len
+ xbufp
->page_len
+
747 xbufp
->tail
[0].iov_len
;
749 task
->tk_action
= call_bc_transmit
;
750 atomic_inc(&task
->tk_count
);
751 BUG_ON(atomic_read(&task
->tk_count
) != 2);
755 dprintk("RPC: rpc_run_bc_task: task= %p\n", task
);
758 #endif /* CONFIG_NFS_V4_1 */
761 rpc_call_start(struct rpc_task
*task
)
763 task
->tk_action
= call_start
;
765 EXPORT_SYMBOL_GPL(rpc_call_start
);
768 * rpc_peeraddr - extract remote peer address from clnt's xprt
769 * @clnt: RPC client structure
770 * @buf: target buffer
771 * @bufsize: length of target buffer
773 * Returns the number of bytes that are actually in the stored address.
775 size_t rpc_peeraddr(struct rpc_clnt
*clnt
, struct sockaddr
*buf
, size_t bufsize
)
778 struct rpc_xprt
*xprt
= clnt
->cl_xprt
;
780 bytes
= sizeof(xprt
->addr
);
783 memcpy(buf
, &clnt
->cl_xprt
->addr
, bytes
);
784 return xprt
->addrlen
;
786 EXPORT_SYMBOL_GPL(rpc_peeraddr
);
789 * rpc_peeraddr2str - return remote peer address in printable format
790 * @clnt: RPC client structure
791 * @format: address format
794 const char *rpc_peeraddr2str(struct rpc_clnt
*clnt
,
795 enum rpc_display_format_t format
)
797 struct rpc_xprt
*xprt
= clnt
->cl_xprt
;
799 if (xprt
->address_strings
[format
] != NULL
)
800 return xprt
->address_strings
[format
];
802 return "unprintable";
804 EXPORT_SYMBOL_GPL(rpc_peeraddr2str
);
807 rpc_setbufsize(struct rpc_clnt
*clnt
, unsigned int sndsize
, unsigned int rcvsize
)
809 struct rpc_xprt
*xprt
= clnt
->cl_xprt
;
810 if (xprt
->ops
->set_buffer_size
)
811 xprt
->ops
->set_buffer_size(xprt
, sndsize
, rcvsize
);
813 EXPORT_SYMBOL_GPL(rpc_setbufsize
);
816 * Return size of largest payload RPC client can support, in bytes
818 * For stream transports, this is one RPC record fragment (see RFC
819 * 1831), as we don't support multi-record requests yet. For datagram
820 * transports, this is the size of an IP packet minus the IP, UDP, and
823 size_t rpc_max_payload(struct rpc_clnt
*clnt
)
825 return clnt
->cl_xprt
->max_payload
;
827 EXPORT_SYMBOL_GPL(rpc_max_payload
);
830 * rpc_force_rebind - force transport to check that remote port is unchanged
831 * @clnt: client to rebind
834 void rpc_force_rebind(struct rpc_clnt
*clnt
)
836 if (clnt
->cl_autobind
)
837 xprt_clear_bound(clnt
->cl_xprt
);
839 EXPORT_SYMBOL_GPL(rpc_force_rebind
);
842 * Restart an (async) RPC call from the call_prepare state.
843 * Usually called from within the exit handler.
846 rpc_restart_call_prepare(struct rpc_task
*task
)
848 if (RPC_ASSASSINATED(task
))
850 task
->tk_action
= rpc_prepare_task
;
853 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare
);
856 * Restart an (async) RPC call. Usually called from within the
860 rpc_restart_call(struct rpc_task
*task
)
862 if (RPC_ASSASSINATED(task
))
864 task
->tk_action
= call_start
;
867 EXPORT_SYMBOL_GPL(rpc_restart_call
);
870 static const char *rpc_proc_name(const struct rpc_task
*task
)
872 const struct rpc_procinfo
*proc
= task
->tk_msg
.rpc_proc
;
887 * Other FSM states can be visited zero or more times, but
888 * this state is visited exactly once for each RPC.
891 call_start(struct rpc_task
*task
)
893 struct rpc_clnt
*clnt
= task
->tk_client
;
895 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task
->tk_pid
,
896 clnt
->cl_protname
, clnt
->cl_vers
,
898 (RPC_IS_ASYNC(task
) ? "async" : "sync"));
900 /* Increment call count */
901 task
->tk_msg
.rpc_proc
->p_count
++;
902 clnt
->cl_stats
->rpccnt
++;
903 task
->tk_action
= call_reserve
;
907 * 1. Reserve an RPC call slot
910 call_reserve(struct rpc_task
*task
)
915 task
->tk_action
= call_reserveresult
;
920 * 1b. Grok the result of xprt_reserve()
923 call_reserveresult(struct rpc_task
*task
)
925 int status
= task
->tk_status
;
930 * After a call to xprt_reserve(), we must have either
931 * a request slot or else an error status.
935 if (task
->tk_rqstp
) {
936 task
->tk_action
= call_refresh
;
940 printk(KERN_ERR
"%s: status=%d, but no request slot, exiting\n",
942 rpc_exit(task
, -EIO
);
947 * Even though there was an error, we may have acquired
948 * a request slot somehow. Make sure not to leak it.
950 if (task
->tk_rqstp
) {
951 printk(KERN_ERR
"%s: status=%d, request allocated anyway\n",
957 case -EAGAIN
: /* woken up; retry */
958 task
->tk_action
= call_reserve
;
960 case -EIO
: /* probably a shutdown */
963 printk(KERN_ERR
"%s: unrecognized error %d, exiting\n",
967 rpc_exit(task
, status
);
971 * 2. Bind and/or refresh the credentials
974 call_refresh(struct rpc_task
*task
)
978 task
->tk_action
= call_refreshresult
;
980 task
->tk_client
->cl_stats
->rpcauthrefresh
++;
981 rpcauth_refreshcred(task
);
985 * 2a. Process the results of a credential refresh
988 call_refreshresult(struct rpc_task
*task
)
990 int status
= task
->tk_status
;
995 task
->tk_action
= call_refresh
;
998 if (rpcauth_uptodatecred(task
))
999 task
->tk_action
= call_allocate
;
1002 rpc_delay(task
, 3*HZ
);
1005 if (!task
->tk_cred_retry
)
1007 task
->tk_cred_retry
--;
1008 dprintk("RPC: %5u %s: retry refresh creds\n",
1009 task
->tk_pid
, __func__
);
1012 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1013 task
->tk_pid
, __func__
, status
);
1014 rpc_exit(task
, status
);
1018 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1019 * (Note: buffer memory is freed in xprt_release).
1022 call_allocate(struct rpc_task
*task
)
1024 unsigned int slack
= task
->tk_rqstp
->rq_cred
->cr_auth
->au_cslack
;
1025 struct rpc_rqst
*req
= task
->tk_rqstp
;
1026 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1027 struct rpc_procinfo
*proc
= task
->tk_msg
.rpc_proc
;
1029 dprint_status(task
);
1031 task
->tk_status
= 0;
1032 task
->tk_action
= call_bind
;
1037 if (proc
->p_proc
!= 0) {
1038 BUG_ON(proc
->p_arglen
== 0);
1039 if (proc
->p_decode
!= NULL
)
1040 BUG_ON(proc
->p_replen
== 0);
1044 * Calculate the size (in quads) of the RPC call
1045 * and reply headers, and convert both values
1048 req
->rq_callsize
= RPC_CALLHDRSIZE
+ (slack
<< 1) + proc
->p_arglen
;
1049 req
->rq_callsize
<<= 2;
1050 req
->rq_rcvsize
= RPC_REPHDRSIZE
+ slack
+ proc
->p_replen
;
1051 req
->rq_rcvsize
<<= 2;
1053 req
->rq_buffer
= xprt
->ops
->buf_alloc(task
,
1054 req
->rq_callsize
+ req
->rq_rcvsize
);
1055 if (req
->rq_buffer
!= NULL
)
1058 dprintk("RPC: %5u rpc_buffer allocation failed\n", task
->tk_pid
);
1060 if (RPC_IS_ASYNC(task
) || !signalled()) {
1061 task
->tk_action
= call_allocate
;
1062 rpc_delay(task
, HZ
>>4);
1066 rpc_exit(task
, -ERESTARTSYS
);
1070 rpc_task_need_encode(struct rpc_task
*task
)
1072 return task
->tk_rqstp
->rq_snd_buf
.len
== 0;
1076 rpc_task_force_reencode(struct rpc_task
*task
)
1078 task
->tk_rqstp
->rq_snd_buf
.len
= 0;
1079 task
->tk_rqstp
->rq_bytes_sent
= 0;
1083 rpc_xdr_buf_init(struct xdr_buf
*buf
, void *start
, size_t len
)
1085 buf
->head
[0].iov_base
= start
;
1086 buf
->head
[0].iov_len
= len
;
1087 buf
->tail
[0].iov_len
= 0;
1095 * 3. Encode arguments of an RPC call
1098 rpc_xdr_encode(struct rpc_task
*task
)
1100 struct rpc_rqst
*req
= task
->tk_rqstp
;
1104 dprint_status(task
);
1106 rpc_xdr_buf_init(&req
->rq_snd_buf
,
1109 rpc_xdr_buf_init(&req
->rq_rcv_buf
,
1110 (char *)req
->rq_buffer
+ req
->rq_callsize
,
1113 p
= rpc_encode_header(task
);
1115 printk(KERN_INFO
"RPC: couldn't encode RPC header, exit EIO\n");
1116 rpc_exit(task
, -EIO
);
1120 encode
= task
->tk_msg
.rpc_proc
->p_encode
;
1124 task
->tk_status
= rpcauth_wrap_req(task
, encode
, req
, p
,
1125 task
->tk_msg
.rpc_argp
);
1129 * 4. Get the server port number if not yet set
1132 call_bind(struct rpc_task
*task
)
1134 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1136 dprint_status(task
);
1138 task
->tk_action
= call_connect
;
1139 if (!xprt_bound(xprt
)) {
1140 task
->tk_action
= call_bind_status
;
1141 task
->tk_timeout
= xprt
->bind_timeout
;
1142 xprt
->ops
->rpcbind(task
);
1147 * 4a. Sort out bind result
1150 call_bind_status(struct rpc_task
*task
)
1154 if (task
->tk_status
>= 0) {
1155 dprint_status(task
);
1156 task
->tk_status
= 0;
1157 task
->tk_action
= call_connect
;
1161 switch (task
->tk_status
) {
1163 dprintk("RPC: %5u rpcbind out of memory\n", task
->tk_pid
);
1164 rpc_delay(task
, HZ
>> 2);
1167 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1168 "unavailable\n", task
->tk_pid
);
1169 /* fail immediately if this is an RPC ping */
1170 if (task
->tk_msg
.rpc_proc
->p_proc
== 0) {
1171 status
= -EOPNOTSUPP
;
1174 rpc_delay(task
, 3*HZ
);
1177 dprintk("RPC: %5u rpcbind request timed out\n",
1181 /* server doesn't support any rpcbind version we know of */
1182 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1185 case -EPROTONOSUPPORT
:
1186 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1188 task
->tk_status
= 0;
1189 task
->tk_action
= call_bind
;
1191 case -ECONNREFUSED
: /* connection problems */
1198 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1199 task
->tk_pid
, task
->tk_status
);
1200 if (!RPC_IS_SOFTCONN(task
)) {
1201 rpc_delay(task
, 5*HZ
);
1204 status
= task
->tk_status
;
1207 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1208 task
->tk_pid
, -task
->tk_status
);
1211 rpc_exit(task
, status
);
1215 task
->tk_action
= call_timeout
;
1219 * 4b. Connect to the RPC server
1222 call_connect(struct rpc_task
*task
)
1224 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1226 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1228 (xprt_connected(xprt
) ? "is" : "is not"));
1230 task
->tk_action
= call_transmit
;
1231 if (!xprt_connected(xprt
)) {
1232 task
->tk_action
= call_connect_status
;
1233 if (task
->tk_status
< 0)
1240 * 4c. Sort out connect result
1243 call_connect_status(struct rpc_task
*task
)
1245 struct rpc_clnt
*clnt
= task
->tk_client
;
1246 int status
= task
->tk_status
;
1248 dprint_status(task
);
1250 task
->tk_status
= 0;
1251 if (status
>= 0 || status
== -EAGAIN
) {
1252 clnt
->cl_stats
->netreconn
++;
1253 task
->tk_action
= call_transmit
;
1258 /* if soft mounted, test if we've timed out */
1260 task
->tk_action
= call_timeout
;
1263 rpc_exit(task
, -EIO
);
1268 * 5. Transmit the RPC request, and wait for reply
1271 call_transmit(struct rpc_task
*task
)
1273 dprint_status(task
);
1275 task
->tk_action
= call_status
;
1276 if (task
->tk_status
< 0)
1278 task
->tk_status
= xprt_prepare_transmit(task
);
1279 if (task
->tk_status
!= 0)
1281 task
->tk_action
= call_transmit_status
;
1282 /* Encode here so that rpcsec_gss can use correct sequence number. */
1283 if (rpc_task_need_encode(task
)) {
1284 BUG_ON(task
->tk_rqstp
->rq_bytes_sent
!= 0);
1285 rpc_xdr_encode(task
);
1286 /* Did the encode result in an error condition? */
1287 if (task
->tk_status
!= 0) {
1288 /* Was the error nonfatal? */
1289 if (task
->tk_status
== -EAGAIN
)
1290 rpc_delay(task
, HZ
>> 4);
1292 rpc_exit(task
, task
->tk_status
);
1296 xprt_transmit(task
);
1297 if (task
->tk_status
< 0)
1300 * On success, ensure that we call xprt_end_transmit() before sleeping
1301 * in order to allow access to the socket to other RPC requests.
1303 call_transmit_status(task
);
1304 if (rpc_reply_expected(task
))
1306 task
->tk_action
= rpc_exit_task
;
1307 rpc_wake_up_queued_task(&task
->tk_xprt
->pending
, task
);
1311 * 5a. Handle cleanup after a transmission
1314 call_transmit_status(struct rpc_task
*task
)
1316 task
->tk_action
= call_status
;
1319 * Common case: success. Force the compiler to put this
1322 if (task
->tk_status
== 0) {
1323 xprt_end_transmit(task
);
1324 rpc_task_force_reencode(task
);
1328 switch (task
->tk_status
) {
1332 dprint_status(task
);
1333 xprt_end_transmit(task
);
1334 rpc_task_force_reencode(task
);
1337 * Special cases: if we've been waiting on the
1338 * socket's write_space() callback, or if the
1339 * socket just returned a connection error,
1340 * then hold onto the transport lock.
1346 if (RPC_IS_SOFTCONN(task
)) {
1347 xprt_end_transmit(task
);
1348 rpc_exit(task
, task
->tk_status
);
1354 rpc_task_force_reencode(task
);
1358 #if defined(CONFIG_NFS_V4_1)
1360 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1361 * addition, disconnect on connectivity errors.
1364 call_bc_transmit(struct rpc_task
*task
)
1366 struct rpc_rqst
*req
= task
->tk_rqstp
;
1368 BUG_ON(task
->tk_status
!= 0);
1369 task
->tk_status
= xprt_prepare_transmit(task
);
1370 if (task
->tk_status
== -EAGAIN
) {
1372 * Could not reserve the transport. Try again after the
1373 * transport is released.
1375 task
->tk_status
= 0;
1376 task
->tk_action
= call_bc_transmit
;
1380 task
->tk_action
= rpc_exit_task
;
1381 if (task
->tk_status
< 0) {
1382 printk(KERN_NOTICE
"RPC: Could not send backchannel reply "
1383 "error: %d\n", task
->tk_status
);
1387 xprt_transmit(task
);
1388 xprt_end_transmit(task
);
1389 dprint_status(task
);
1390 switch (task
->tk_status
) {
1399 * Problem reaching the server. Disconnect and let the
1400 * forechannel reestablish the connection. The server will
1401 * have to retransmit the backchannel request and we'll
1402 * reprocess it. Since these ops are idempotent, there's no
1403 * need to cache our reply at this time.
1405 printk(KERN_NOTICE
"RPC: Could not send backchannel reply "
1406 "error: %d\n", task
->tk_status
);
1407 xprt_conditional_disconnect(task
->tk_xprt
,
1408 req
->rq_connect_cookie
);
1412 * We were unable to reply and will have to drop the
1413 * request. The server should reconnect and retransmit.
1415 BUG_ON(task
->tk_status
== -EAGAIN
);
1416 printk(KERN_NOTICE
"RPC: Could not send backchannel reply "
1417 "error: %d\n", task
->tk_status
);
1420 rpc_wake_up_queued_task(&req
->rq_xprt
->pending
, task
);
1422 #endif /* CONFIG_NFS_V4_1 */
1425 * 6. Sort out the RPC call status
1428 call_status(struct rpc_task
*task
)
1430 struct rpc_clnt
*clnt
= task
->tk_client
;
1431 struct rpc_rqst
*req
= task
->tk_rqstp
;
1434 if (req
->rq_reply_bytes_recvd
> 0 && !req
->rq_bytes_sent
)
1435 task
->tk_status
= req
->rq_reply_bytes_recvd
;
1437 dprint_status(task
);
1439 status
= task
->tk_status
;
1441 task
->tk_action
= call_decode
;
1445 task
->tk_status
= 0;
1451 * Delay any retries for 3 seconds, then handle as if it
1454 rpc_delay(task
, 3*HZ
);
1456 task
->tk_action
= call_timeout
;
1457 if (task
->tk_client
->cl_discrtry
)
1458 xprt_conditional_disconnect(task
->tk_xprt
,
1459 req
->rq_connect_cookie
);
1463 rpc_force_rebind(clnt
);
1464 rpc_delay(task
, 3*HZ
);
1467 task
->tk_action
= call_bind
;
1470 task
->tk_action
= call_transmit
;
1473 /* shutdown or soft timeout */
1474 rpc_exit(task
, status
);
1477 if (clnt
->cl_chatty
)
1478 printk("%s: RPC call returned error %d\n",
1479 clnt
->cl_protname
, -status
);
1480 rpc_exit(task
, status
);
1485 * 6a. Handle RPC timeout
1486 * We do not release the request slot, so we keep using the
1487 * same XID for all retransmits.
1490 call_timeout(struct rpc_task
*task
)
1492 struct rpc_clnt
*clnt
= task
->tk_client
;
1494 if (xprt_adjust_timeout(task
->tk_rqstp
) == 0) {
1495 dprintk("RPC: %5u call_timeout (minor)\n", task
->tk_pid
);
1499 dprintk("RPC: %5u call_timeout (major)\n", task
->tk_pid
);
1500 task
->tk_timeouts
++;
1502 if (RPC_IS_SOFTCONN(task
)) {
1503 rpc_exit(task
, -ETIMEDOUT
);
1506 if (RPC_IS_SOFT(task
)) {
1507 if (clnt
->cl_chatty
)
1508 printk(KERN_NOTICE
"%s: server %s not responding, timed out\n",
1509 clnt
->cl_protname
, clnt
->cl_server
);
1510 if (task
->tk_flags
& RPC_TASK_TIMEOUT
)
1511 rpc_exit(task
, -ETIMEDOUT
);
1513 rpc_exit(task
, -EIO
);
1517 if (!(task
->tk_flags
& RPC_CALL_MAJORSEEN
)) {
1518 task
->tk_flags
|= RPC_CALL_MAJORSEEN
;
1519 if (clnt
->cl_chatty
)
1520 printk(KERN_NOTICE
"%s: server %s not responding, still trying\n",
1521 clnt
->cl_protname
, clnt
->cl_server
);
1523 rpc_force_rebind(clnt
);
1525 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1526 * event? RFC2203 requires the server to drop all such requests.
1528 rpcauth_invalcred(task
);
1531 clnt
->cl_stats
->rpcretrans
++;
1532 task
->tk_action
= call_bind
;
1533 task
->tk_status
= 0;
1537 * 7. Decode the RPC reply
1540 call_decode(struct rpc_task
*task
)
1542 struct rpc_clnt
*clnt
= task
->tk_client
;
1543 struct rpc_rqst
*req
= task
->tk_rqstp
;
1544 kxdrdproc_t decode
= task
->tk_msg
.rpc_proc
->p_decode
;
1547 dprintk("RPC: %5u call_decode (status %d)\n",
1548 task
->tk_pid
, task
->tk_status
);
1550 if (task
->tk_flags
& RPC_CALL_MAJORSEEN
) {
1551 if (clnt
->cl_chatty
)
1552 printk(KERN_NOTICE
"%s: server %s OK\n",
1553 clnt
->cl_protname
, clnt
->cl_server
);
1554 task
->tk_flags
&= ~RPC_CALL_MAJORSEEN
;
1558 * Ensure that we see all writes made by xprt_complete_rqst()
1559 * before it changed req->rq_reply_bytes_recvd.
1562 req
->rq_rcv_buf
.len
= req
->rq_private_buf
.len
;
1564 /* Check that the softirq receive buffer is valid */
1565 WARN_ON(memcmp(&req
->rq_rcv_buf
, &req
->rq_private_buf
,
1566 sizeof(req
->rq_rcv_buf
)) != 0);
1568 if (req
->rq_rcv_buf
.len
< 12) {
1569 if (!RPC_IS_SOFT(task
)) {
1570 task
->tk_action
= call_bind
;
1571 clnt
->cl_stats
->rpcretrans
++;
1574 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1575 clnt
->cl_protname
, task
->tk_status
);
1576 task
->tk_action
= call_timeout
;
1580 p
= rpc_verify_header(task
);
1582 if (p
== ERR_PTR(-EAGAIN
))
1587 task
->tk_action
= rpc_exit_task
;
1590 task
->tk_status
= rpcauth_unwrap_resp(task
, decode
, req
, p
,
1591 task
->tk_msg
.rpc_resp
);
1593 dprintk("RPC: %5u call_decode result %d\n", task
->tk_pid
,
1597 task
->tk_status
= 0;
1598 /* Note: rpc_verify_header() may have freed the RPC slot */
1599 if (task
->tk_rqstp
== req
) {
1600 req
->rq_reply_bytes_recvd
= req
->rq_rcv_buf
.len
= 0;
1601 if (task
->tk_client
->cl_discrtry
)
1602 xprt_conditional_disconnect(task
->tk_xprt
,
1603 req
->rq_connect_cookie
);
1608 rpc_encode_header(struct rpc_task
*task
)
1610 struct rpc_clnt
*clnt
= task
->tk_client
;
1611 struct rpc_rqst
*req
= task
->tk_rqstp
;
1612 __be32
*p
= req
->rq_svec
[0].iov_base
;
1614 /* FIXME: check buffer size? */
1616 p
= xprt_skip_transport_header(task
->tk_xprt
, p
);
1617 *p
++ = req
->rq_xid
; /* XID */
1618 *p
++ = htonl(RPC_CALL
); /* CALL */
1619 *p
++ = htonl(RPC_VERSION
); /* RPC version */
1620 *p
++ = htonl(clnt
->cl_prog
); /* program number */
1621 *p
++ = htonl(clnt
->cl_vers
); /* program version */
1622 *p
++ = htonl(task
->tk_msg
.rpc_proc
->p_proc
); /* procedure */
1623 p
= rpcauth_marshcred(task
, p
);
1624 req
->rq_slen
= xdr_adjust_iovec(&req
->rq_svec
[0], p
);
1629 rpc_verify_header(struct rpc_task
*task
)
1631 struct kvec
*iov
= &task
->tk_rqstp
->rq_rcv_buf
.head
[0];
1632 int len
= task
->tk_rqstp
->rq_rcv_buf
.len
>> 2;
1633 __be32
*p
= iov
->iov_base
;
1635 int error
= -EACCES
;
1637 if ((task
->tk_rqstp
->rq_rcv_buf
.len
& 3) != 0) {
1638 /* RFC-1014 says that the representation of XDR data must be a
1639 * multiple of four bytes
1640 * - if it isn't pointer subtraction in the NFS client may give
1643 dprintk("RPC: %5u %s: XDR representation not a multiple of"
1644 " 4 bytes: 0x%x\n", task
->tk_pid
, __func__
,
1645 task
->tk_rqstp
->rq_rcv_buf
.len
);
1651 p
+= 1; /* skip XID */
1652 if ((n
= ntohl(*p
++)) != RPC_REPLY
) {
1653 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
1654 task
->tk_pid
, __func__
, n
);
1658 if ((n
= ntohl(*p
++)) != RPC_MSG_ACCEPTED
) {
1661 switch ((n
= ntohl(*p
++))) {
1662 case RPC_AUTH_ERROR
:
1665 dprintk("RPC: %5u %s: RPC call version "
1667 task
->tk_pid
, __func__
);
1668 error
= -EPROTONOSUPPORT
;
1671 dprintk("RPC: %5u %s: RPC call rejected, "
1672 "unknown error: %x\n",
1673 task
->tk_pid
, __func__
, n
);
1678 switch ((n
= ntohl(*p
++))) {
1679 case RPC_AUTH_REJECTEDCRED
:
1680 case RPC_AUTH_REJECTEDVERF
:
1681 case RPCSEC_GSS_CREDPROBLEM
:
1682 case RPCSEC_GSS_CTXPROBLEM
:
1683 if (!task
->tk_cred_retry
)
1685 task
->tk_cred_retry
--;
1686 dprintk("RPC: %5u %s: retry stale creds\n",
1687 task
->tk_pid
, __func__
);
1688 rpcauth_invalcred(task
);
1689 /* Ensure we obtain a new XID! */
1691 task
->tk_action
= call_reserve
;
1693 case RPC_AUTH_BADCRED
:
1694 case RPC_AUTH_BADVERF
:
1695 /* possibly garbled cred/verf? */
1696 if (!task
->tk_garb_retry
)
1698 task
->tk_garb_retry
--;
1699 dprintk("RPC: %5u %s: retry garbled creds\n",
1700 task
->tk_pid
, __func__
);
1701 task
->tk_action
= call_bind
;
1703 case RPC_AUTH_TOOWEAK
:
1704 printk(KERN_NOTICE
"RPC: server %s requires stronger "
1705 "authentication.\n", task
->tk_client
->cl_server
);
1708 dprintk("RPC: %5u %s: unknown auth error: %x\n",
1709 task
->tk_pid
, __func__
, n
);
1712 dprintk("RPC: %5u %s: call rejected %d\n",
1713 task
->tk_pid
, __func__
, n
);
1716 if (!(p
= rpcauth_checkverf(task
, p
))) {
1717 dprintk("RPC: %5u %s: auth check failed\n",
1718 task
->tk_pid
, __func__
);
1719 goto out_garbage
; /* bad verifier, retry */
1721 len
= p
- (__be32
*)iov
->iov_base
- 1;
1724 switch ((n
= ntohl(*p
++))) {
1727 case RPC_PROG_UNAVAIL
:
1728 dprintk("RPC: %5u %s: program %u is unsupported by server %s\n",
1729 task
->tk_pid
, __func__
,
1730 (unsigned int)task
->tk_client
->cl_prog
,
1731 task
->tk_client
->cl_server
);
1732 error
= -EPFNOSUPPORT
;
1734 case RPC_PROG_MISMATCH
:
1735 dprintk("RPC: %5u %s: program %u, version %u unsupported by "
1736 "server %s\n", task
->tk_pid
, __func__
,
1737 (unsigned int)task
->tk_client
->cl_prog
,
1738 (unsigned int)task
->tk_client
->cl_vers
,
1739 task
->tk_client
->cl_server
);
1740 error
= -EPROTONOSUPPORT
;
1742 case RPC_PROC_UNAVAIL
:
1743 dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
1744 "version %u on server %s\n",
1745 task
->tk_pid
, __func__
,
1746 rpc_proc_name(task
),
1747 task
->tk_client
->cl_prog
,
1748 task
->tk_client
->cl_vers
,
1749 task
->tk_client
->cl_server
);
1750 error
= -EOPNOTSUPP
;
1752 case RPC_GARBAGE_ARGS
:
1753 dprintk("RPC: %5u %s: server saw garbage\n",
1754 task
->tk_pid
, __func__
);
1757 dprintk("RPC: %5u %s: server accept status: %x\n",
1758 task
->tk_pid
, __func__
, n
);
1763 task
->tk_client
->cl_stats
->rpcgarbage
++;
1764 if (task
->tk_garb_retry
) {
1765 task
->tk_garb_retry
--;
1766 dprintk("RPC: %5u %s: retrying\n",
1767 task
->tk_pid
, __func__
);
1768 task
->tk_action
= call_bind
;
1770 return ERR_PTR(-EAGAIN
);
1775 rpc_exit(task
, error
);
1776 dprintk("RPC: %5u %s: call failed with error %d\n", task
->tk_pid
,
1778 return ERR_PTR(error
);
1780 dprintk("RPC: %5u %s: server reply was truncated.\n", task
->tk_pid
,
1785 static void rpcproc_encode_null(void *rqstp
, struct xdr_stream
*xdr
, void *obj
)
1789 static int rpcproc_decode_null(void *rqstp
, struct xdr_stream
*xdr
, void *obj
)
1794 static struct rpc_procinfo rpcproc_null
= {
1795 .p_encode
= rpcproc_encode_null
,
1796 .p_decode
= rpcproc_decode_null
,
1799 static int rpc_ping(struct rpc_clnt
*clnt
)
1801 struct rpc_message msg
= {
1802 .rpc_proc
= &rpcproc_null
,
1805 msg
.rpc_cred
= authnull_ops
.lookup_cred(NULL
, NULL
, 0);
1806 err
= rpc_call_sync(clnt
, &msg
, RPC_TASK_SOFT
| RPC_TASK_SOFTCONN
);
1807 put_rpccred(msg
.rpc_cred
);
1811 struct rpc_task
*rpc_call_null(struct rpc_clnt
*clnt
, struct rpc_cred
*cred
, int flags
)
1813 struct rpc_message msg
= {
1814 .rpc_proc
= &rpcproc_null
,
1817 struct rpc_task_setup task_setup_data
= {
1819 .rpc_message
= &msg
,
1820 .callback_ops
= &rpc_default_ops
,
1823 return rpc_run_task(&task_setup_data
);
1825 EXPORT_SYMBOL_GPL(rpc_call_null
);
1828 static void rpc_show_header(void)
1830 printk(KERN_INFO
"-pid- flgs status -client- --rqstp- "
1831 "-timeout ---ops--\n");
1834 static void rpc_show_task(const struct rpc_clnt
*clnt
,
1835 const struct rpc_task
*task
)
1837 const char *rpc_waitq
= "none";
1839 if (RPC_IS_QUEUED(task
))
1840 rpc_waitq
= rpc_qname(task
->tk_waitqueue
);
1842 printk(KERN_INFO
"%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
1843 task
->tk_pid
, task
->tk_flags
, task
->tk_status
,
1844 clnt
, task
->tk_rqstp
, task
->tk_timeout
, task
->tk_ops
,
1845 clnt
->cl_protname
, clnt
->cl_vers
, rpc_proc_name(task
),
1846 task
->tk_action
, rpc_waitq
);
1849 void rpc_show_tasks(void)
1851 struct rpc_clnt
*clnt
;
1852 struct rpc_task
*task
;
1855 spin_lock(&rpc_client_lock
);
1856 list_for_each_entry(clnt
, &all_clients
, cl_clients
) {
1857 spin_lock(&clnt
->cl_lock
);
1858 list_for_each_entry(task
, &clnt
->cl_tasks
, tk_task
) {
1863 rpc_show_task(clnt
, task
);
1865 spin_unlock(&clnt
->cl_lock
);
1867 spin_unlock(&rpc_client_lock
);