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_refresh
;
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
);