/*
|
/*
|
* linux/net/sunrpc/rpcclnt.c
|
* linux/net/sunrpc/rpcclnt.c
|
*
|
*
|
* This file contains the high-level RPC interface.
|
* This file contains the high-level RPC interface.
|
* It is modeled as a finite state machine to support both synchronous
|
* It is modeled as a finite state machine to support both synchronous
|
* and asynchronous requests.
|
* and asynchronous requests.
|
*
|
*
|
* - RPC header generation and argument serialization.
|
* - RPC header generation and argument serialization.
|
* - Credential refresh.
|
* - Credential refresh.
|
* - TCP reconnect handling (when finished).
|
* - TCP reconnect handling (when finished).
|
* - Retry of operation when it is suspected the operation failed because
|
* - Retry of operation when it is suspected the operation failed because
|
* of uid squashing on the server, or when the credentials were stale
|
* of uid squashing on the server, or when the credentials were stale
|
* and need to be refreshed, or when a packet was damaged in transit.
|
* and need to be refreshed, or when a packet was damaged in transit.
|
* This may be have to be moved to the VFS layer.
|
* This may be have to be moved to the VFS layer.
|
*
|
*
|
* NB: BSD uses a more intelligent approach to guessing when a request
|
* NB: BSD uses a more intelligent approach to guessing when a request
|
* or reply has been lost by keeping the RTO estimate for each procedure.
|
* or reply has been lost by keeping the RTO estimate for each procedure.
|
* We currently make do with a constant timeout value.
|
* We currently make do with a constant timeout value.
|
*
|
*
|
* Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
|
* Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
|
* Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
|
* Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
|
*/
|
*/
|
|
|
#include <asm/system.h>
|
#include <asm/system.h>
|
|
|
#include <linux/types.h>
|
#include <linux/types.h>
|
#include <linux/mm.h>
|
#include <linux/mm.h>
|
#include <linux/slab.h>
|
#include <linux/slab.h>
|
#include <linux/in.h>
|
#include <linux/in.h>
|
#include <linux/utsname.h>
|
#include <linux/utsname.h>
|
|
|
#include <linux/sunrpc/clnt.h>
|
#include <linux/sunrpc/clnt.h>
|
|
|
#include <linux/nfs.h>
|
#include <linux/nfs.h>
|
|
|
|
|
#define RPC_SLACK_SPACE 512 /* total overkill */
|
#define RPC_SLACK_SPACE 512 /* total overkill */
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
# define RPCDBG_FACILITY RPCDBG_CALL
|
# define RPCDBG_FACILITY RPCDBG_CALL
|
#endif
|
#endif
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
|
static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
|
|
|
|
|
static void call_start(struct rpc_task *task);
|
static void call_start(struct rpc_task *task);
|
static void call_reserve(struct rpc_task *task);
|
static void call_reserve(struct rpc_task *task);
|
static void call_reserveresult(struct rpc_task *task);
|
static void call_reserveresult(struct rpc_task *task);
|
static void call_allocate(struct rpc_task *task);
|
static void call_allocate(struct rpc_task *task);
|
static void call_encode(struct rpc_task *task);
|
static void call_encode(struct rpc_task *task);
|
static void call_decode(struct rpc_task *task);
|
static void call_decode(struct rpc_task *task);
|
static void call_bind(struct rpc_task *task);
|
static void call_bind(struct rpc_task *task);
|
static void call_transmit(struct rpc_task *task);
|
static void call_transmit(struct rpc_task *task);
|
static void call_status(struct rpc_task *task);
|
static void call_status(struct rpc_task *task);
|
static void call_refresh(struct rpc_task *task);
|
static void call_refresh(struct rpc_task *task);
|
static void call_refreshresult(struct rpc_task *task);
|
static void call_refreshresult(struct rpc_task *task);
|
static void call_timeout(struct rpc_task *task);
|
static void call_timeout(struct rpc_task *task);
|
static void call_connect(struct rpc_task *task);
|
static void call_connect(struct rpc_task *task);
|
static void call_connect_status(struct rpc_task *);
|
static void call_connect_status(struct rpc_task *);
|
static u32 * call_header(struct rpc_task *task);
|
static u32 * call_header(struct rpc_task *task);
|
static u32 * call_verify(struct rpc_task *task);
|
static u32 * call_verify(struct rpc_task *task);
|
|
|
|
|
/*
|
/*
|
* Create an RPC client
|
* Create an RPC client
|
* FIXME: This should also take a flags argument (as in task->tk_flags).
|
* FIXME: This should also take a flags argument (as in task->tk_flags).
|
* It's called (among others) from pmap_create_client, which may in
|
* It's called (among others) from pmap_create_client, which may in
|
* turn be called by an async task. In this case, rpciod should not be
|
* turn be called by an async task. In this case, rpciod should not be
|
* made to sleep too long.
|
* made to sleep too long.
|
*/
|
*/
|
struct rpc_clnt *
|
struct rpc_clnt *
|
rpc_create_client(struct rpc_xprt *xprt, char *servname,
|
rpc_create_client(struct rpc_xprt *xprt, char *servname,
|
struct rpc_program *program, u32 vers, int flavor)
|
struct rpc_program *program, u32 vers, int flavor)
|
{
|
{
|
struct rpc_version *version;
|
struct rpc_version *version;
|
struct rpc_clnt *clnt = NULL;
|
struct rpc_clnt *clnt = NULL;
|
|
|
dprintk("RPC: creating %s client for %s (xprt %p)\n",
|
dprintk("RPC: creating %s client for %s (xprt %p)\n",
|
program->name, servname, xprt);
|
program->name, servname, xprt);
|
|
|
if (!xprt)
|
if (!xprt)
|
goto out;
|
goto out;
|
if (vers >= program->nrvers || !(version = program->version[vers]))
|
if (vers >= program->nrvers || !(version = program->version[vers]))
|
goto out;
|
goto out;
|
|
|
clnt = (struct rpc_clnt *) rpc_allocate(0, sizeof(*clnt));
|
clnt = (struct rpc_clnt *) rpc_allocate(0, sizeof(*clnt));
|
if (!clnt)
|
if (!clnt)
|
goto out_no_clnt;
|
goto out_no_clnt;
|
memset(clnt, 0, sizeof(*clnt));
|
memset(clnt, 0, sizeof(*clnt));
|
atomic_set(&clnt->cl_users, 0);
|
atomic_set(&clnt->cl_users, 0);
|
|
|
clnt->cl_xprt = xprt;
|
clnt->cl_xprt = xprt;
|
clnt->cl_procinfo = version->procs;
|
clnt->cl_procinfo = version->procs;
|
clnt->cl_maxproc = version->nrprocs;
|
clnt->cl_maxproc = version->nrprocs;
|
clnt->cl_server = servname;
|
clnt->cl_server = servname;
|
clnt->cl_protname = program->name;
|
clnt->cl_protname = program->name;
|
clnt->cl_port = xprt->addr.sin_port;
|
clnt->cl_port = xprt->addr.sin_port;
|
clnt->cl_prog = program->number;
|
clnt->cl_prog = program->number;
|
clnt->cl_vers = version->number;
|
clnt->cl_vers = version->number;
|
clnt->cl_prot = xprt->prot;
|
clnt->cl_prot = xprt->prot;
|
clnt->cl_stats = program->stats;
|
clnt->cl_stats = program->stats;
|
INIT_RPC_WAITQ(&clnt->cl_bindwait, "bindwait");
|
INIT_RPC_WAITQ(&clnt->cl_bindwait, "bindwait");
|
|
|
if (!clnt->cl_port)
|
if (!clnt->cl_port)
|
clnt->cl_autobind = 1;
|
clnt->cl_autobind = 1;
|
|
|
rpc_init_rtt(&clnt->cl_rtt, xprt->timeout.to_initval);
|
rpc_init_rtt(&clnt->cl_rtt, xprt->timeout.to_initval);
|
|
|
if (!rpcauth_create(flavor, clnt))
|
if (!rpcauth_create(flavor, clnt))
|
goto out_no_auth;
|
goto out_no_auth;
|
|
|
/* save the nodename */
|
/* save the nodename */
|
clnt->cl_nodelen = strlen(system_utsname.nodename);
|
clnt->cl_nodelen = strlen(system_utsname.nodename);
|
if (clnt->cl_nodelen > UNX_MAXNODENAME)
|
if (clnt->cl_nodelen > UNX_MAXNODENAME)
|
clnt->cl_nodelen = UNX_MAXNODENAME;
|
clnt->cl_nodelen = UNX_MAXNODENAME;
|
memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
|
memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
|
out:
|
out:
|
return clnt;
|
return clnt;
|
|
|
out_no_clnt:
|
out_no_clnt:
|
printk(KERN_INFO "RPC: out of memory in rpc_create_client\n");
|
printk(KERN_INFO "RPC: out of memory in rpc_create_client\n");
|
goto out;
|
goto out;
|
out_no_auth:
|
out_no_auth:
|
printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %d)\n",
|
printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %d)\n",
|
flavor);
|
flavor);
|
rpc_free(clnt);
|
rpc_free(clnt);
|
clnt = NULL;
|
clnt = NULL;
|
goto out;
|
goto out;
|
}
|
}
|
|
|
/*
|
/*
|
* Properly shut down an RPC client, terminating all outstanding
|
* Properly shut down an RPC client, terminating all outstanding
|
* requests. Note that we must be certain that cl_oneshot and
|
* requests. Note that we must be certain that cl_oneshot and
|
* cl_dead are cleared, or else the client would be destroyed
|
* cl_dead are cleared, or else the client would be destroyed
|
* when the last task releases it.
|
* when the last task releases it.
|
*/
|
*/
|
int
|
int
|
rpc_shutdown_client(struct rpc_clnt *clnt)
|
rpc_shutdown_client(struct rpc_clnt *clnt)
|
{
|
{
|
dprintk("RPC: shutting down %s client for %s\n",
|
dprintk("RPC: shutting down %s client for %s\n",
|
clnt->cl_protname, clnt->cl_server);
|
clnt->cl_protname, clnt->cl_server);
|
while (atomic_read(&clnt->cl_users)) {
|
while (atomic_read(&clnt->cl_users)) {
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
dprintk("RPC: rpc_shutdown_client: client %s, tasks=%d\n",
|
dprintk("RPC: rpc_shutdown_client: client %s, tasks=%d\n",
|
clnt->cl_protname, atomic_read(&clnt->cl_users));
|
clnt->cl_protname, atomic_read(&clnt->cl_users));
|
#endif
|
#endif
|
/* Don't let rpc_release_client destroy us */
|
/* Don't let rpc_release_client destroy us */
|
clnt->cl_oneshot = 0;
|
clnt->cl_oneshot = 0;
|
clnt->cl_dead = 0;
|
clnt->cl_dead = 0;
|
rpc_killall_tasks(clnt);
|
rpc_killall_tasks(clnt);
|
sleep_on_timeout(&destroy_wait, 1*HZ);
|
sleep_on_timeout(&destroy_wait, 1*HZ);
|
}
|
}
|
return rpc_destroy_client(clnt);
|
return rpc_destroy_client(clnt);
|
}
|
}
|
|
|
/*
|
/*
|
* Delete an RPC client
|
* Delete an RPC client
|
*/
|
*/
|
int
|
int
|
rpc_destroy_client(struct rpc_clnt *clnt)
|
rpc_destroy_client(struct rpc_clnt *clnt)
|
{
|
{
|
dprintk("RPC: destroying %s client for %s\n",
|
dprintk("RPC: destroying %s client for %s\n",
|
clnt->cl_protname, clnt->cl_server);
|
clnt->cl_protname, clnt->cl_server);
|
|
|
if (clnt->cl_auth) {
|
if (clnt->cl_auth) {
|
rpcauth_destroy(clnt->cl_auth);
|
rpcauth_destroy(clnt->cl_auth);
|
clnt->cl_auth = NULL;
|
clnt->cl_auth = NULL;
|
}
|
}
|
if (clnt->cl_xprt) {
|
if (clnt->cl_xprt) {
|
xprt_destroy(clnt->cl_xprt);
|
xprt_destroy(clnt->cl_xprt);
|
clnt->cl_xprt = NULL;
|
clnt->cl_xprt = NULL;
|
}
|
}
|
rpc_free(clnt);
|
rpc_free(clnt);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Release an RPC client
|
* Release an RPC client
|
*/
|
*/
|
void
|
void
|
rpc_release_client(struct rpc_clnt *clnt)
|
rpc_release_client(struct rpc_clnt *clnt)
|
{
|
{
|
dprintk("RPC: rpc_release_client(%p, %d)\n",
|
dprintk("RPC: rpc_release_client(%p, %d)\n",
|
clnt, atomic_read(&clnt->cl_users));
|
clnt, atomic_read(&clnt->cl_users));
|
|
|
if (!atomic_dec_and_test(&clnt->cl_users))
|
if (!atomic_dec_and_test(&clnt->cl_users))
|
return;
|
return;
|
wake_up(&destroy_wait);
|
wake_up(&destroy_wait);
|
if (clnt->cl_oneshot || clnt->cl_dead)
|
if (clnt->cl_oneshot || clnt->cl_dead)
|
rpc_destroy_client(clnt);
|
rpc_destroy_client(clnt);
|
}
|
}
|
|
|
/*
|
/*
|
* Default callback for async RPC calls
|
* Default callback for async RPC calls
|
*/
|
*/
|
static void
|
static void
|
rpc_default_callback(struct rpc_task *task)
|
rpc_default_callback(struct rpc_task *task)
|
{
|
{
|
}
|
}
|
|
|
/*
|
/*
|
* Export the signal mask handling for aysnchronous code that
|
* Export the signal mask handling for aysnchronous code that
|
* sleeps on RPC calls
|
* sleeps on RPC calls
|
*/
|
*/
|
|
|
void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
{
|
{
|
unsigned long sigallow = sigmask(SIGKILL);
|
unsigned long sigallow = sigmask(SIGKILL);
|
unsigned long irqflags;
|
unsigned long irqflags;
|
|
|
/* Turn off various signals */
|
/* Turn off various signals */
|
if (clnt->cl_intr) {
|
if (clnt->cl_intr) {
|
struct k_sigaction *action = current->sig->action;
|
struct k_sigaction *action = current->sig->action;
|
if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
|
if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
|
sigallow |= sigmask(SIGINT);
|
sigallow |= sigmask(SIGINT);
|
if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
|
if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
|
sigallow |= sigmask(SIGQUIT);
|
sigallow |= sigmask(SIGQUIT);
|
}
|
}
|
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
|
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
|
*oldset = current->blocked;
|
*oldset = current->blocked;
|
siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
|
siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
|
recalc_sigpending(current);
|
recalc_sigpending(current);
|
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
|
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
|
}
|
}
|
|
|
void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
|
{
|
{
|
unsigned long irqflags;
|
unsigned long irqflags;
|
|
|
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
|
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
|
current->blocked = *oldset;
|
current->blocked = *oldset;
|
recalc_sigpending(current);
|
recalc_sigpending(current);
|
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
|
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
|
}
|
}
|
|
|
/*
|
/*
|
* New rpc_call implementation
|
* New rpc_call implementation
|
*/
|
*/
|
int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
|
int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
|
{
|
{
|
struct rpc_task my_task, *task = &my_task;
|
struct rpc_task my_task, *task = &my_task;
|
sigset_t oldset;
|
sigset_t oldset;
|
int status;
|
int status;
|
|
|
/* If this client is slain all further I/O fails */
|
/* If this client is slain all further I/O fails */
|
if (clnt->cl_dead)
|
if (clnt->cl_dead)
|
return -EIO;
|
return -EIO;
|
|
|
if (flags & RPC_TASK_ASYNC) {
|
if (flags & RPC_TASK_ASYNC) {
|
printk("rpc_call_sync: Illegal flag combination for synchronous task\n");
|
printk("rpc_call_sync: Illegal flag combination for synchronous task\n");
|
flags &= ~RPC_TASK_ASYNC;
|
flags &= ~RPC_TASK_ASYNC;
|
}
|
}
|
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
|
/* Create/initialize a new RPC task */
|
/* Create/initialize a new RPC task */
|
rpc_init_task(task, clnt, NULL, flags);
|
rpc_init_task(task, clnt, NULL, flags);
|
rpc_call_setup(task, msg, 0);
|
rpc_call_setup(task, msg, 0);
|
|
|
/* Set up the call info struct and execute the task */
|
/* Set up the call info struct and execute the task */
|
if (task->tk_status == 0)
|
if (task->tk_status == 0)
|
status = rpc_execute(task);
|
status = rpc_execute(task);
|
else {
|
else {
|
status = task->tk_status;
|
status = task->tk_status;
|
rpc_release_task(task);
|
rpc_release_task(task);
|
}
|
}
|
|
|
rpc_clnt_sigunmask(clnt, &oldset);
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
|
return status;
|
return status;
|
}
|
}
|
|
|
/*
|
/*
|
* New rpc_call implementation
|
* New rpc_call implementation
|
*/
|
*/
|
int
|
int
|
rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
|
rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
|
rpc_action callback, void *data)
|
rpc_action callback, void *data)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
sigset_t oldset;
|
sigset_t oldset;
|
int status;
|
int status;
|
|
|
/* If this client is slain all further I/O fails */
|
/* If this client is slain all further I/O fails */
|
if (clnt->cl_dead)
|
if (clnt->cl_dead)
|
return -EIO;
|
return -EIO;
|
|
|
flags |= RPC_TASK_ASYNC;
|
flags |= RPC_TASK_ASYNC;
|
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
|
/* Create/initialize a new RPC task */
|
/* Create/initialize a new RPC task */
|
if (!callback)
|
if (!callback)
|
callback = rpc_default_callback;
|
callback = rpc_default_callback;
|
status = -ENOMEM;
|
status = -ENOMEM;
|
if (!(task = rpc_new_task(clnt, callback, flags)))
|
if (!(task = rpc_new_task(clnt, callback, flags)))
|
goto out;
|
goto out;
|
task->tk_calldata = data;
|
task->tk_calldata = data;
|
|
|
rpc_call_setup(task, msg, 0);
|
rpc_call_setup(task, msg, 0);
|
|
|
/* Set up the call info struct and execute the task */
|
/* Set up the call info struct and execute the task */
|
if (task->tk_status == 0)
|
if (task->tk_status == 0)
|
status = rpc_execute(task);
|
status = rpc_execute(task);
|
else {
|
else {
|
status = task->tk_status;
|
status = task->tk_status;
|
rpc_release_task(task);
|
rpc_release_task(task);
|
}
|
}
|
|
|
out:
|
out:
|
rpc_clnt_sigunmask(clnt, &oldset);
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
|
return status;
|
return status;
|
}
|
}
|
|
|
|
|
void
|
void
|
rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
|
rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
|
{
|
{
|
task->tk_msg = *msg;
|
task->tk_msg = *msg;
|
task->tk_flags |= flags;
|
task->tk_flags |= flags;
|
/* Bind the user cred */
|
/* Bind the user cred */
|
if (task->tk_msg.rpc_cred != NULL) {
|
if (task->tk_msg.rpc_cred != NULL) {
|
rpcauth_holdcred(task);
|
rpcauth_holdcred(task);
|
} else
|
} else
|
rpcauth_bindcred(task);
|
rpcauth_bindcred(task);
|
|
|
if (task->tk_status == 0)
|
if (task->tk_status == 0)
|
task->tk_action = call_start;
|
task->tk_action = call_start;
|
else
|
else
|
task->tk_action = NULL;
|
task->tk_action = NULL;
|
}
|
}
|
|
|
void
|
void
|
rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
|
rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
|
{
|
{
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
|
|
xprt->sndsize = 0;
|
xprt->sndsize = 0;
|
if (sndsize)
|
if (sndsize)
|
xprt->sndsize = sndsize + RPC_SLACK_SPACE;
|
xprt->sndsize = sndsize + RPC_SLACK_SPACE;
|
xprt->rcvsize = 0;
|
xprt->rcvsize = 0;
|
if (rcvsize)
|
if (rcvsize)
|
xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
|
xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
|
xprt_sock_setbufsize(xprt);
|
xprt_sock_setbufsize(xprt);
|
}
|
}
|
|
|
/*
|
/*
|
* Restart an (async) RPC call. Usually called from within the
|
* Restart an (async) RPC call. Usually called from within the
|
* exit handler.
|
* exit handler.
|
*/
|
*/
|
void
|
void
|
rpc_restart_call(struct rpc_task *task)
|
rpc_restart_call(struct rpc_task *task)
|
{
|
{
|
if (RPC_ASSASSINATED(task))
|
if (RPC_ASSASSINATED(task))
|
return;
|
return;
|
|
|
task->tk_action = call_start;
|
task->tk_action = call_start;
|
}
|
}
|
|
|
/*
|
/*
|
* 0. Initial state
|
* 0. Initial state
|
*
|
*
|
* Other FSM states can be visited zero or more times, but
|
* Other FSM states can be visited zero or more times, but
|
* this state is visited exactly once for each RPC.
|
* this state is visited exactly once for each RPC.
|
*/
|
*/
|
static void
|
static void
|
call_start(struct rpc_task *task)
|
call_start(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
if (task->tk_msg.rpc_proc > clnt->cl_maxproc) {
|
if (task->tk_msg.rpc_proc > clnt->cl_maxproc) {
|
printk(KERN_ERR "%s (vers %d): bad procedure number %d\n",
|
printk(KERN_ERR "%s (vers %d): bad procedure number %d\n",
|
clnt->cl_protname, clnt->cl_vers,
|
clnt->cl_protname, clnt->cl_vers,
|
task->tk_msg.rpc_proc);
|
task->tk_msg.rpc_proc);
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
return;
|
return;
|
}
|
}
|
|
|
dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
|
dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
|
clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc,
|
clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc,
|
(RPC_IS_ASYNC(task) ? "async" : "sync"));
|
(RPC_IS_ASYNC(task) ? "async" : "sync"));
|
|
|
/* Increment call count */
|
/* Increment call count */
|
rpcproc_count(clnt, task->tk_msg.rpc_proc)++;
|
rpcproc_count(clnt, task->tk_msg.rpc_proc)++;
|
clnt->cl_stats->rpccnt++;
|
clnt->cl_stats->rpccnt++;
|
task->tk_action = call_reserve;
|
task->tk_action = call_reserve;
|
}
|
}
|
|
|
/*
|
/*
|
* 1. Reserve an RPC call slot
|
* 1. Reserve an RPC call slot
|
*/
|
*/
|
static void
|
static void
|
call_reserve(struct rpc_task *task)
|
call_reserve(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d call_reserve\n", task->tk_pid);
|
dprintk("RPC: %4d call_reserve\n", task->tk_pid);
|
|
|
if (!rpcauth_uptodatecred(task)) {
|
if (!rpcauth_uptodatecred(task)) {
|
task->tk_action = call_refresh;
|
task->tk_action = call_refresh;
|
return;
|
return;
|
}
|
}
|
|
|
task->tk_status = 0;
|
task->tk_status = 0;
|
task->tk_action = call_reserveresult;
|
task->tk_action = call_reserveresult;
|
xprt_reserve(task);
|
xprt_reserve(task);
|
}
|
}
|
|
|
/*
|
/*
|
* 1b. Grok the result of xprt_reserve()
|
* 1b. Grok the result of xprt_reserve()
|
*/
|
*/
|
static void
|
static void
|
call_reserveresult(struct rpc_task *task)
|
call_reserveresult(struct rpc_task *task)
|
{
|
{
|
int status = task->tk_status;
|
int status = task->tk_status;
|
|
|
dprintk("RPC: %4d call_reserveresult (status %d)\n",
|
dprintk("RPC: %4d call_reserveresult (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
/*
|
/*
|
* After a call to xprt_reserve(), we must have either
|
* After a call to xprt_reserve(), we must have either
|
* a request slot or else an error status.
|
* a request slot or else an error status.
|
*/
|
*/
|
task->tk_status = 0;
|
task->tk_status = 0;
|
if (status >= 0) {
|
if (status >= 0) {
|
if (task->tk_rqstp) {
|
if (task->tk_rqstp) {
|
task->tk_action = call_allocate;
|
task->tk_action = call_allocate;
|
return;
|
return;
|
}
|
}
|
|
|
printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
|
printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
|
__FUNCTION__, status);
|
__FUNCTION__, status);
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
return;
|
return;
|
}
|
}
|
|
|
/*
|
/*
|
* Even though there was an error, we may have acquired
|
* Even though there was an error, we may have acquired
|
* a request slot somehow. Make sure not to leak it.
|
* a request slot somehow. Make sure not to leak it.
|
*/
|
*/
|
if (task->tk_rqstp) {
|
if (task->tk_rqstp) {
|
printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
|
printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
|
__FUNCTION__, status);
|
__FUNCTION__, status);
|
xprt_release(task);
|
xprt_release(task);
|
}
|
}
|
|
|
switch (status) {
|
switch (status) {
|
case -EAGAIN: /* woken up; retry */
|
case -EAGAIN: /* woken up; retry */
|
task->tk_action = call_reserve;
|
task->tk_action = call_reserve;
|
return;
|
return;
|
case -EIO: /* probably a shutdown */
|
case -EIO: /* probably a shutdown */
|
break;
|
break;
|
default:
|
default:
|
printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
|
printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
|
__FUNCTION__, status);
|
__FUNCTION__, status);
|
break;
|
break;
|
}
|
}
|
rpc_exit(task, status);
|
rpc_exit(task, status);
|
}
|
}
|
|
|
/*
|
/*
|
* 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
|
* 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
|
* (Note: buffer memory is freed in rpc_task_release).
|
* (Note: buffer memory is freed in rpc_task_release).
|
*/
|
*/
|
static void
|
static void
|
call_allocate(struct rpc_task *task)
|
call_allocate(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
unsigned int bufsiz;
|
unsigned int bufsiz;
|
|
|
dprintk("RPC: %4d call_allocate (status %d)\n",
|
dprintk("RPC: %4d call_allocate (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
task->tk_action = call_encode;
|
task->tk_action = call_encode;
|
if (task->tk_buffer)
|
if (task->tk_buffer)
|
return;
|
return;
|
|
|
/* FIXME: compute buffer requirements more exactly using
|
/* FIXME: compute buffer requirements more exactly using
|
* auth->au_wslack */
|
* auth->au_wslack */
|
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc) + RPC_SLACK_SPACE;
|
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc) + RPC_SLACK_SPACE;
|
|
|
if ((task->tk_buffer = rpc_malloc(task, bufsiz << 1)) != NULL)
|
if ((task->tk_buffer = rpc_malloc(task, bufsiz << 1)) != NULL)
|
return;
|
return;
|
printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
|
printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
|
|
|
if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
|
if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
|
xprt_release(task);
|
xprt_release(task);
|
task->tk_action = call_reserve;
|
task->tk_action = call_reserve;
|
rpc_delay(task, HZ>>4);
|
rpc_delay(task, HZ>>4);
|
return;
|
return;
|
}
|
}
|
|
|
rpc_exit(task, -ERESTARTSYS);
|
rpc_exit(task, -ERESTARTSYS);
|
}
|
}
|
|
|
/*
|
/*
|
* 3. Encode arguments of an RPC call
|
* 3. Encode arguments of an RPC call
|
*/
|
*/
|
static void
|
static void
|
call_encode(struct rpc_task *task)
|
call_encode(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_rqst *req = task->tk_rqstp;
|
struct rpc_rqst *req = task->tk_rqstp;
|
struct xdr_buf *sndbuf = &req->rq_snd_buf;
|
struct xdr_buf *sndbuf = &req->rq_snd_buf;
|
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
|
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
|
unsigned int bufsiz;
|
unsigned int bufsiz;
|
kxdrproc_t encode;
|
kxdrproc_t encode;
|
int status;
|
int status;
|
u32 *p;
|
u32 *p;
|
|
|
dprintk("RPC: %4d call_encode (status %d)\n",
|
dprintk("RPC: %4d call_encode (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
task->tk_action = call_bind;
|
task->tk_action = call_bind;
|
|
|
/* Default buffer setup */
|
/* Default buffer setup */
|
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc)+RPC_SLACK_SPACE;
|
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc)+RPC_SLACK_SPACE;
|
sndbuf->head[0].iov_base = (void *)task->tk_buffer;
|
sndbuf->head[0].iov_base = (void *)task->tk_buffer;
|
sndbuf->head[0].iov_len = bufsiz;
|
sndbuf->head[0].iov_len = bufsiz;
|
sndbuf->tail[0].iov_len = 0;
|
sndbuf->tail[0].iov_len = 0;
|
sndbuf->page_len = 0;
|
sndbuf->page_len = 0;
|
sndbuf->len = 0;
|
sndbuf->len = 0;
|
rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
|
rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
|
rcvbuf->head[0].iov_len = bufsiz;
|
rcvbuf->head[0].iov_len = bufsiz;
|
rcvbuf->tail[0].iov_len = 0;
|
rcvbuf->tail[0].iov_len = 0;
|
rcvbuf->page_len = 0;
|
rcvbuf->page_len = 0;
|
rcvbuf->len = bufsiz;
|
rcvbuf->len = bufsiz;
|
|
|
/* Zero buffer so we have automatic zero-padding of opaque & string */
|
/* Zero buffer so we have automatic zero-padding of opaque & string */
|
memset(task->tk_buffer, 0, bufsiz);
|
memset(task->tk_buffer, 0, bufsiz);
|
|
|
/* Encode header and provided arguments */
|
/* Encode header and provided arguments */
|
encode = rpcproc_encode(clnt, task->tk_msg.rpc_proc);
|
encode = rpcproc_encode(clnt, task->tk_msg.rpc_proc);
|
if (!(p = call_header(task))) {
|
if (!(p = call_header(task))) {
|
printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
|
printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
} else
|
} else
|
if (encode && (status = encode(req, p, task->tk_msg.rpc_argp)) < 0) {
|
if (encode && (status = encode(req, p, task->tk_msg.rpc_argp)) < 0) {
|
printk(KERN_WARNING "%s: can't encode arguments: %d\n",
|
printk(KERN_WARNING "%s: can't encode arguments: %d\n",
|
clnt->cl_protname, -status);
|
clnt->cl_protname, -status);
|
rpc_exit(task, status);
|
rpc_exit(task, status);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* 4. Get the server port number if not yet set
|
* 4. Get the server port number if not yet set
|
*/
|
*/
|
static void
|
static void
|
call_bind(struct rpc_task *task)
|
call_bind(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
|
|
dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
|
dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
|
xprt, (xprt_connected(xprt) ? "is" : "is not"));
|
xprt, (xprt_connected(xprt) ? "is" : "is not"));
|
|
|
task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
|
task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
|
|
|
if (!clnt->cl_port) {
|
if (!clnt->cl_port) {
|
task->tk_action = call_connect;
|
task->tk_action = call_connect;
|
task->tk_timeout = clnt->cl_timeout.to_maxval;
|
task->tk_timeout = clnt->cl_timeout.to_maxval;
|
rpc_getport(task, clnt);
|
rpc_getport(task, clnt);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* 4a. Establish socket
|
* 4a. Establish socket
|
* Connect to the RPC server (TCP case)
|
* Connect to the RPC server (TCP case)
|
*/
|
*/
|
static void
|
static void
|
call_connect(struct rpc_task *task)
|
call_connect(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
dprintk("RPC: %4d call_connect status %d\n",
|
dprintk("RPC: %4d call_connect status %d\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
if (xprt_connected(clnt->cl_xprt)) {
|
if (xprt_connected(clnt->cl_xprt)) {
|
task->tk_action = call_transmit;
|
task->tk_action = call_transmit;
|
return;
|
return;
|
}
|
}
|
task->tk_action = call_connect_status;
|
task->tk_action = call_connect_status;
|
if (task->tk_status < 0)
|
if (task->tk_status < 0)
|
return;
|
return;
|
xprt_connect(task);
|
xprt_connect(task);
|
}
|
}
|
|
|
/*
|
/*
|
* 4b. Sort out reconnection result
|
* 4b. Sort out reconnection result
|
*/
|
*/
|
static void call_connect_status(struct rpc_task *task)
|
static void call_connect_status(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
int status = task->tk_status;
|
int status = task->tk_status;
|
|
|
task->tk_status = 0;
|
task->tk_status = 0;
|
if (status >= 0) {
|
if (status >= 0) {
|
clnt->cl_stats->netreconn++;
|
clnt->cl_stats->netreconn++;
|
task->tk_action = call_transmit;
|
task->tk_action = call_transmit;
|
return;
|
return;
|
}
|
}
|
|
|
/* Something failed: we may have to rebind */
|
/* Something failed: we may have to rebind */
|
if (clnt->cl_autobind)
|
if (clnt->cl_autobind)
|
clnt->cl_port = 0;
|
clnt->cl_port = 0;
|
switch (status) {
|
switch (status) {
|
case -ECONNREFUSED:
|
case -ECONNREFUSED:
|
case -ECONNRESET:
|
case -ECONNRESET:
|
case -ENOTCONN:
|
case -ENOTCONN:
|
case -ETIMEDOUT:
|
case -ETIMEDOUT:
|
case -EAGAIN:
|
case -EAGAIN:
|
task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
|
task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
|
break;
|
break;
|
default:
|
default:
|
rpc_exit(task, status);
|
rpc_exit(task, status);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* 5. Transmit the RPC request, and wait for reply
|
* 5. Transmit the RPC request, and wait for reply
|
*/
|
*/
|
static void
|
static void
|
call_transmit(struct rpc_task *task)
|
call_transmit(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
dprintk("RPC: %4d call_transmit (status %d)\n",
|
dprintk("RPC: %4d call_transmit (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
task->tk_action = call_status;
|
task->tk_action = call_status;
|
if (task->tk_status < 0)
|
if (task->tk_status < 0)
|
return;
|
return;
|
xprt_transmit(task);
|
xprt_transmit(task);
|
if (!rpcproc_decode(clnt, task->tk_msg.rpc_proc) && task->tk_status >= 0) {
|
if (!rpcproc_decode(clnt, task->tk_msg.rpc_proc) && task->tk_status >= 0) {
|
task->tk_action = NULL;
|
task->tk_action = NULL;
|
rpc_wake_up_task(task);
|
rpc_wake_up_task(task);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* 6. Sort out the RPC call status
|
* 6. Sort out the RPC call status
|
*/
|
*/
|
static void
|
static void
|
call_status(struct rpc_task *task)
|
call_status(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_rqst *req = task->tk_rqstp;
|
struct rpc_rqst *req = task->tk_rqstp;
|
int status;
|
int status;
|
|
|
smp_rmb();
|
smp_rmb();
|
if (req->rq_received > 0 && !req->rq_bytes_sent)
|
if (req->rq_received > 0 && !req->rq_bytes_sent)
|
task->tk_status = req->rq_received;
|
task->tk_status = req->rq_received;
|
|
|
dprintk("RPC: %4d call_status (status %d)\n",
|
dprintk("RPC: %4d call_status (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
status = task->tk_status;
|
status = task->tk_status;
|
if (status >= 0) {
|
if (status >= 0) {
|
task->tk_action = call_decode;
|
task->tk_action = call_decode;
|
return;
|
return;
|
}
|
}
|
|
|
task->tk_status = 0;
|
task->tk_status = 0;
|
switch(status) {
|
switch(status) {
|
case -ETIMEDOUT:
|
case -ETIMEDOUT:
|
task->tk_action = call_timeout;
|
task->tk_action = call_timeout;
|
break;
|
break;
|
case -ECONNREFUSED:
|
case -ECONNREFUSED:
|
case -ENOTCONN:
|
case -ENOTCONN:
|
req->rq_bytes_sent = 0;
|
req->rq_bytes_sent = 0;
|
if (clnt->cl_autobind || !clnt->cl_port) {
|
if (clnt->cl_autobind || !clnt->cl_port) {
|
clnt->cl_port = 0;
|
clnt->cl_port = 0;
|
task->tk_action = call_bind;
|
task->tk_action = call_bind;
|
break;
|
break;
|
}
|
}
|
task->tk_action = call_connect;
|
task->tk_action = call_connect;
|
break;
|
break;
|
/*
|
/*
|
* Sleep and dream of an open connection
|
* Sleep and dream of an open connection
|
*/
|
*/
|
task->tk_timeout = 5 * HZ;
|
task->tk_timeout = 5 * HZ;
|
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
|
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
|
case -ENOMEM:
|
case -ENOMEM:
|
case -EAGAIN:
|
case -EAGAIN:
|
task->tk_action = call_transmit;
|
task->tk_action = call_transmit;
|
break;
|
break;
|
default:
|
default:
|
if (clnt->cl_chatty)
|
if (clnt->cl_chatty)
|
printk("%s: RPC call returned error %d\n",
|
printk("%s: RPC call returned error %d\n",
|
clnt->cl_protname, -status);
|
clnt->cl_protname, -status);
|
rpc_exit(task, status);
|
rpc_exit(task, status);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* 6a. Handle RPC timeout
|
* 6a. Handle RPC timeout
|
* We do not release the request slot, so we keep using the
|
* We do not release the request slot, so we keep using the
|
* same XID for all retransmits.
|
* same XID for all retransmits.
|
*/
|
*/
|
static void
|
static void
|
call_timeout(struct rpc_task *task)
|
call_timeout(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_timeout *to = &task->tk_rqstp->rq_timeout;
|
struct rpc_timeout *to = &task->tk_rqstp->rq_timeout;
|
|
|
if (xprt_adjust_timeout(to)) {
|
if (xprt_adjust_timeout(to)) {
|
dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
|
dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
|
goto retry;
|
goto retry;
|
}
|
}
|
to->to_retries = clnt->cl_timeout.to_retries;
|
to->to_retries = clnt->cl_timeout.to_retries;
|
|
|
dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
|
dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
|
if (clnt->cl_softrtry) {
|
if (clnt->cl_softrtry) {
|
if (clnt->cl_chatty)
|
if (clnt->cl_chatty)
|
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
|
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
|
clnt->cl_protname, clnt->cl_server);
|
clnt->cl_protname, clnt->cl_server);
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
return;
|
return;
|
}
|
}
|
|
|
if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
task->tk_flags |= RPC_CALL_MAJORSEEN;
|
task->tk_flags |= RPC_CALL_MAJORSEEN;
|
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
|
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
|
clnt->cl_protname, clnt->cl_server);
|
clnt->cl_protname, clnt->cl_server);
|
}
|
}
|
if (clnt->cl_autobind)
|
if (clnt->cl_autobind)
|
clnt->cl_port = 0;
|
clnt->cl_port = 0;
|
|
|
retry:
|
retry:
|
clnt->cl_stats->rpcretrans++;
|
clnt->cl_stats->rpcretrans++;
|
task->tk_action = call_bind;
|
task->tk_action = call_bind;
|
task->tk_status = 0;
|
task->tk_status = 0;
|
}
|
}
|
|
|
/*
|
/*
|
* 7. Decode the RPC reply
|
* 7. Decode the RPC reply
|
*/
|
*/
|
static void
|
static void
|
call_decode(struct rpc_task *task)
|
call_decode(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_rqst *req = task->tk_rqstp;
|
struct rpc_rqst *req = task->tk_rqstp;
|
kxdrproc_t decode = rpcproc_decode(clnt, task->tk_msg.rpc_proc);
|
kxdrproc_t decode = rpcproc_decode(clnt, task->tk_msg.rpc_proc);
|
u32 *p;
|
u32 *p;
|
|
|
dprintk("RPC: %4d call_decode (status %d)\n",
|
dprintk("RPC: %4d call_decode (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
|
printk(KERN_NOTICE "%s: server %s OK\n",
|
printk(KERN_NOTICE "%s: server %s OK\n",
|
clnt->cl_protname, clnt->cl_server);
|
clnt->cl_protname, clnt->cl_server);
|
task->tk_flags &= ~RPC_CALL_MAJORSEEN;
|
task->tk_flags &= ~RPC_CALL_MAJORSEEN;
|
}
|
}
|
|
|
if (task->tk_status < 12) {
|
if (task->tk_status < 12) {
|
if (!clnt->cl_softrtry) {
|
if (!clnt->cl_softrtry) {
|
task->tk_action = call_transmit;
|
task->tk_action = call_transmit;
|
clnt->cl_stats->rpcretrans++;
|
clnt->cl_stats->rpcretrans++;
|
goto out_retry;
|
goto out_retry;
|
}
|
}
|
printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
|
printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
|
clnt->cl_protname, task->tk_status);
|
clnt->cl_protname, task->tk_status);
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
return;
|
return;
|
}
|
}
|
|
|
/* Check that the softirq receive buffer is valid */
|
/* Check that the softirq receive buffer is valid */
|
if (unlikely(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
|
if (unlikely(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
|
sizeof(req->rq_rcv_buf)) != 0))
|
sizeof(req->rq_rcv_buf)) != 0))
|
printk(KERN_WARNING "%s: receive buffer is inconsistent. Please contact maintainer.\n",
|
printk(KERN_WARNING "%s: receive buffer is inconsistent. Please contact maintainer.\n",
|
__FUNCTION__);
|
__FUNCTION__);
|
|
|
/* Verify the RPC header */
|
/* Verify the RPC header */
|
if (!(p = call_verify(task))) {
|
if (!(p = call_verify(task))) {
|
/*
|
/*
|
* When call_verfiy sets tk_action to NULL (via task_exit)
|
* When call_verfiy sets tk_action to NULL (via task_exit)
|
* a non-retry-able error has occurred (like the server
|
* a non-retry-able error has occurred (like the server
|
* not supporting a particular procedure call).
|
* not supporting a particular procedure call).
|
*/
|
*/
|
if (task->tk_action == NULL)
|
if (task->tk_action == NULL)
|
return;
|
return;
|
goto out_retry;
|
goto out_retry;
|
}
|
}
|
/*
|
/*
|
* The following is an NFS-specific hack to cater for setuid
|
* The following is an NFS-specific hack to cater for setuid
|
* processes whose uid is mapped to nobody on the server.
|
* processes whose uid is mapped to nobody on the server.
|
*/
|
*/
|
if (task->tk_client->cl_droppriv &&
|
if (task->tk_client->cl_droppriv &&
|
(ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) {
|
(ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) {
|
if (RPC_IS_SETUID(task) && task->tk_suid_retry) {
|
if (RPC_IS_SETUID(task) && task->tk_suid_retry) {
|
dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
|
dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
|
task->tk_flags ^= RPC_CALL_REALUID;
|
task->tk_flags ^= RPC_CALL_REALUID;
|
task->tk_action = call_encode;
|
task->tk_action = call_encode;
|
task->tk_suid_retry--;
|
task->tk_suid_retry--;
|
goto out_retry;
|
goto out_retry;
|
}
|
}
|
}
|
}
|
|
|
task->tk_action = NULL;
|
task->tk_action = NULL;
|
|
|
if (decode)
|
if (decode)
|
task->tk_status = decode(req, p, task->tk_msg.rpc_resp);
|
task->tk_status = decode(req, p, task->tk_msg.rpc_resp);
|
dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
|
dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
|
task->tk_status);
|
task->tk_status);
|
return;
|
return;
|
out_retry:
|
out_retry:
|
req->rq_received = 0;
|
req->rq_received = 0;
|
task->tk_status = 0;
|
task->tk_status = 0;
|
}
|
}
|
|
|
/*
|
/*
|
* 8. Refresh the credentials if rejected by the server
|
* 8. Refresh the credentials if rejected by the server
|
*/
|
*/
|
static void
|
static void
|
call_refresh(struct rpc_task *task)
|
call_refresh(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d call_refresh\n", task->tk_pid);
|
dprintk("RPC: %4d call_refresh\n", task->tk_pid);
|
|
|
xprt_release(task); /* Must do to obtain new XID */
|
xprt_release(task); /* Must do to obtain new XID */
|
task->tk_action = call_refreshresult;
|
task->tk_action = call_refreshresult;
|
task->tk_status = 0;
|
task->tk_status = 0;
|
task->tk_client->cl_stats->rpcauthrefresh++;
|
task->tk_client->cl_stats->rpcauthrefresh++;
|
rpcauth_refreshcred(task);
|
rpcauth_refreshcred(task);
|
}
|
}
|
|
|
/*
|
/*
|
* 8a. Process the results of a credential refresh
|
* 8a. Process the results of a credential refresh
|
*/
|
*/
|
static void
|
static void
|
call_refreshresult(struct rpc_task *task)
|
call_refreshresult(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d call_refreshresult (status %d)\n",
|
dprintk("RPC: %4d call_refreshresult (status %d)\n",
|
task->tk_pid, task->tk_status);
|
task->tk_pid, task->tk_status);
|
|
|
if (task->tk_status < 0)
|
if (task->tk_status < 0)
|
rpc_exit(task, -EACCES);
|
rpc_exit(task, -EACCES);
|
else
|
else
|
task->tk_action = call_reserve;
|
task->tk_action = call_reserve;
|
}
|
}
|
|
|
/*
|
/*
|
* Call header serialization
|
* Call header serialization
|
*/
|
*/
|
static u32 *
|
static u32 *
|
call_header(struct rpc_task *task)
|
call_header(struct rpc_task *task)
|
{
|
{
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_clnt *clnt = task->tk_client;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_xprt *xprt = clnt->cl_xprt;
|
struct rpc_rqst *req = task->tk_rqstp;
|
struct rpc_rqst *req = task->tk_rqstp;
|
u32 *p = req->rq_svec[0].iov_base;
|
u32 *p = req->rq_svec[0].iov_base;
|
|
|
/* FIXME: check buffer size? */
|
/* FIXME: check buffer size? */
|
if (xprt->stream)
|
if (xprt->stream)
|
*p++ = 0; /* fill in later */
|
*p++ = 0; /* fill in later */
|
*p++ = req->rq_xid; /* XID */
|
*p++ = req->rq_xid; /* XID */
|
*p++ = htonl(RPC_CALL); /* CALL */
|
*p++ = htonl(RPC_CALL); /* CALL */
|
*p++ = htonl(RPC_VERSION); /* RPC version */
|
*p++ = htonl(RPC_VERSION); /* RPC version */
|
*p++ = htonl(clnt->cl_prog); /* program number */
|
*p++ = htonl(clnt->cl_prog); /* program number */
|
*p++ = htonl(clnt->cl_vers); /* program version */
|
*p++ = htonl(clnt->cl_vers); /* program version */
|
*p++ = htonl(task->tk_msg.rpc_proc); /* procedure */
|
*p++ = htonl(task->tk_msg.rpc_proc); /* procedure */
|
return rpcauth_marshcred(task, p);
|
return rpcauth_marshcred(task, p);
|
}
|
}
|
|
|
/*
|
/*
|
* Reply header verification
|
* Reply header verification
|
*/
|
*/
|
static u32 *
|
static u32 *
|
call_verify(struct rpc_task *task)
|
call_verify(struct rpc_task *task)
|
{
|
{
|
u32 *p = task->tk_rqstp->rq_rvec[0].iov_base, n;
|
u32 *p = task->tk_rqstp->rq_rvec[0].iov_base, n;
|
|
|
p += 1; /* skip XID */
|
p += 1; /* skip XID */
|
|
|
if ((n = ntohl(*p++)) != RPC_REPLY) {
|
if ((n = ntohl(*p++)) != RPC_REPLY) {
|
printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
|
printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
|
goto garbage;
|
goto garbage;
|
}
|
}
|
if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
|
if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
|
int error = -EACCES;
|
int error = -EACCES;
|
|
|
if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
|
if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
|
printk(KERN_WARNING "call_verify: RPC call rejected: %x\n", n);
|
printk(KERN_WARNING "call_verify: RPC call rejected: %x\n", n);
|
} else
|
} else
|
switch ((n = ntohl(*p++))) {
|
switch ((n = ntohl(*p++))) {
|
case RPC_AUTH_REJECTEDCRED:
|
case RPC_AUTH_REJECTEDCRED:
|
case RPC_AUTH_REJECTEDVERF:
|
case RPC_AUTH_REJECTEDVERF:
|
if (!task->tk_cred_retry)
|
if (!task->tk_cred_retry)
|
break;
|
break;
|
task->tk_cred_retry--;
|
task->tk_cred_retry--;
|
dprintk("RPC: %4d call_verify: retry stale creds\n",
|
dprintk("RPC: %4d call_verify: retry stale creds\n",
|
task->tk_pid);
|
task->tk_pid);
|
rpcauth_invalcred(task);
|
rpcauth_invalcred(task);
|
task->tk_action = call_refresh;
|
task->tk_action = call_refresh;
|
return NULL;
|
return NULL;
|
case RPC_AUTH_BADCRED:
|
case RPC_AUTH_BADCRED:
|
case RPC_AUTH_BADVERF:
|
case RPC_AUTH_BADVERF:
|
/* possibly garbled cred/verf? */
|
/* possibly garbled cred/verf? */
|
if (!task->tk_garb_retry)
|
if (!task->tk_garb_retry)
|
break;
|
break;
|
task->tk_garb_retry--;
|
task->tk_garb_retry--;
|
dprintk("RPC: %4d call_verify: retry garbled creds\n",
|
dprintk("RPC: %4d call_verify: retry garbled creds\n",
|
task->tk_pid);
|
task->tk_pid);
|
task->tk_action = call_encode;
|
task->tk_action = call_encode;
|
return NULL;
|
return NULL;
|
case RPC_AUTH_TOOWEAK:
|
case RPC_AUTH_TOOWEAK:
|
printk(KERN_NOTICE "call_verify: server requires stronger "
|
printk(KERN_NOTICE "call_verify: server requires stronger "
|
"authentication.\n");
|
"authentication.\n");
|
break;
|
break;
|
default:
|
default:
|
printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
|
printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
|
error = -EIO;
|
error = -EIO;
|
}
|
}
|
dprintk("RPC: %4d call_verify: call rejected %d\n",
|
dprintk("RPC: %4d call_verify: call rejected %d\n",
|
task->tk_pid, n);
|
task->tk_pid, n);
|
rpc_exit(task, error);
|
rpc_exit(task, error);
|
return NULL;
|
return NULL;
|
}
|
}
|
if (!(p = rpcauth_checkverf(task, p))) {
|
if (!(p = rpcauth_checkverf(task, p))) {
|
printk(KERN_WARNING "call_verify: auth check failed\n");
|
printk(KERN_WARNING "call_verify: auth check failed\n");
|
goto garbage; /* bad verifier, retry */
|
goto garbage; /* bad verifier, retry */
|
}
|
}
|
switch ((n = ntohl(*p++))) {
|
switch ((n = ntohl(*p++))) {
|
case RPC_SUCCESS:
|
case RPC_SUCCESS:
|
return p;
|
return p;
|
case RPC_PROG_UNAVAIL:
|
case RPC_PROG_UNAVAIL:
|
printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
|
printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
|
(unsigned int)task->tk_client->cl_prog,
|
(unsigned int)task->tk_client->cl_prog,
|
task->tk_client->cl_server);
|
task->tk_client->cl_server);
|
goto out_eio;
|
goto out_eio;
|
case RPC_PROG_MISMATCH:
|
case RPC_PROG_MISMATCH:
|
printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
|
printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
|
(unsigned int)task->tk_client->cl_prog,
|
(unsigned int)task->tk_client->cl_prog,
|
(unsigned int)task->tk_client->cl_vers,
|
(unsigned int)task->tk_client->cl_vers,
|
task->tk_client->cl_server);
|
task->tk_client->cl_server);
|
goto out_eio;
|
goto out_eio;
|
case RPC_PROC_UNAVAIL:
|
case RPC_PROC_UNAVAIL:
|
printk(KERN_WARNING "RPC: call_verify: proc %u unsupported by program %u, version %u on server %s\n",
|
printk(KERN_WARNING "RPC: call_verify: proc %u unsupported by program %u, version %u on server %s\n",
|
(unsigned int)task->tk_msg.rpc_proc,
|
(unsigned int)task->tk_msg.rpc_proc,
|
(unsigned int)task->tk_client->cl_prog,
|
(unsigned int)task->tk_client->cl_prog,
|
(unsigned int)task->tk_client->cl_vers,
|
(unsigned int)task->tk_client->cl_vers,
|
task->tk_client->cl_server);
|
task->tk_client->cl_server);
|
goto out_eio;
|
goto out_eio;
|
case RPC_GARBAGE_ARGS:
|
case RPC_GARBAGE_ARGS:
|
break; /* retry */
|
break; /* retry */
|
default:
|
default:
|
printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
|
printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
|
/* Also retry */
|
/* Also retry */
|
}
|
}
|
|
|
garbage:
|
garbage:
|
dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
|
dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
|
task->tk_client->cl_stats->rpcgarbage++;
|
task->tk_client->cl_stats->rpcgarbage++;
|
if (task->tk_garb_retry) {
|
if (task->tk_garb_retry) {
|
task->tk_garb_retry--;
|
task->tk_garb_retry--;
|
dprintk(KERN_WARNING "RPC: garbage, retrying %4d\n", task->tk_pid);
|
dprintk(KERN_WARNING "RPC: garbage, retrying %4d\n", task->tk_pid);
|
task->tk_action = call_encode;
|
task->tk_action = call_encode;
|
return NULL;
|
return NULL;
|
}
|
}
|
printk(KERN_WARNING "RPC: garbage, exit EIO\n");
|
printk(KERN_WARNING "RPC: garbage, exit EIO\n");
|
out_eio:
|
out_eio:
|
rpc_exit(task, -EIO);
|
rpc_exit(task, -EIO);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
