![Trond Myklebust](/assets/img/avatar_default.png)
We're always _only_ waking up tasks from within the sp_threads list, so we know that they are enqueued and alive. The rq_wait waitqueue is just a distraction with extra atomic semantics. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1401 lines
33 KiB
C
1401 lines
33 KiB
C
/*
|
|
* linux/net/sunrpc/svc.c
|
|
*
|
|
* High-level RPC service routines
|
|
*
|
|
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
|
|
*
|
|
* Multiple threads pools and NUMAisation
|
|
* Copyright (c) 2006 Silicon Graphics, Inc.
|
|
* by Greg Banks <gnb@melbourne.sgi.com>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/net.h>
|
|
#include <linux/in.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/sunrpc/types.h>
|
|
#include <linux/sunrpc/xdr.h>
|
|
#include <linux/sunrpc/stats.h>
|
|
#include <linux/sunrpc/svcsock.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/sunrpc/bc_xprt.h>
|
|
|
|
#define RPCDBG_FACILITY RPCDBG_SVCDSP
|
|
|
|
static void svc_unregister(const struct svc_serv *serv, struct net *net);
|
|
|
|
#define svc_serv_is_pooled(serv) ((serv)->sv_function)
|
|
|
|
/*
|
|
* Mode for mapping cpus to pools.
|
|
*/
|
|
enum {
|
|
SVC_POOL_AUTO = -1, /* choose one of the others */
|
|
SVC_POOL_GLOBAL, /* no mapping, just a single global pool
|
|
* (legacy & UP mode) */
|
|
SVC_POOL_PERCPU, /* one pool per cpu */
|
|
SVC_POOL_PERNODE /* one pool per numa node */
|
|
};
|
|
#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
|
|
|
|
/*
|
|
* Structure for mapping cpus to pools and vice versa.
|
|
* Setup once during sunrpc initialisation.
|
|
*/
|
|
static struct svc_pool_map {
|
|
int count; /* How many svc_servs use us */
|
|
int mode; /* Note: int not enum to avoid
|
|
* warnings about "enumeration value
|
|
* not handled in switch" */
|
|
unsigned int npools;
|
|
unsigned int *pool_to; /* maps pool id to cpu or node */
|
|
unsigned int *to_pool; /* maps cpu or node to pool id */
|
|
} svc_pool_map = {
|
|
.count = 0,
|
|
.mode = SVC_POOL_DEFAULT
|
|
};
|
|
static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
|
|
|
|
static int
|
|
param_set_pool_mode(const char *val, struct kernel_param *kp)
|
|
{
|
|
int *ip = (int *)kp->arg;
|
|
struct svc_pool_map *m = &svc_pool_map;
|
|
int err;
|
|
|
|
mutex_lock(&svc_pool_map_mutex);
|
|
|
|
err = -EBUSY;
|
|
if (m->count)
|
|
goto out;
|
|
|
|
err = 0;
|
|
if (!strncmp(val, "auto", 4))
|
|
*ip = SVC_POOL_AUTO;
|
|
else if (!strncmp(val, "global", 6))
|
|
*ip = SVC_POOL_GLOBAL;
|
|
else if (!strncmp(val, "percpu", 6))
|
|
*ip = SVC_POOL_PERCPU;
|
|
else if (!strncmp(val, "pernode", 7))
|
|
*ip = SVC_POOL_PERNODE;
|
|
else
|
|
err = -EINVAL;
|
|
|
|
out:
|
|
mutex_unlock(&svc_pool_map_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
param_get_pool_mode(char *buf, struct kernel_param *kp)
|
|
{
|
|
int *ip = (int *)kp->arg;
|
|
|
|
switch (*ip)
|
|
{
|
|
case SVC_POOL_AUTO:
|
|
return strlcpy(buf, "auto", 20);
|
|
case SVC_POOL_GLOBAL:
|
|
return strlcpy(buf, "global", 20);
|
|
case SVC_POOL_PERCPU:
|
|
return strlcpy(buf, "percpu", 20);
|
|
case SVC_POOL_PERNODE:
|
|
return strlcpy(buf, "pernode", 20);
|
|
default:
|
|
return sprintf(buf, "%d", *ip);
|
|
}
|
|
}
|
|
|
|
module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
|
|
&svc_pool_map.mode, 0644);
|
|
|
|
/*
|
|
* Detect best pool mapping mode heuristically,
|
|
* according to the machine's topology.
|
|
*/
|
|
static int
|
|
svc_pool_map_choose_mode(void)
|
|
{
|
|
unsigned int node;
|
|
|
|
if (nr_online_nodes > 1) {
|
|
/*
|
|
* Actually have multiple NUMA nodes,
|
|
* so split pools on NUMA node boundaries
|
|
*/
|
|
return SVC_POOL_PERNODE;
|
|
}
|
|
|
|
node = first_online_node;
|
|
if (nr_cpus_node(node) > 2) {
|
|
/*
|
|
* Non-trivial SMP, or CONFIG_NUMA on
|
|
* non-NUMA hardware, e.g. with a generic
|
|
* x86_64 kernel on Xeons. In this case we
|
|
* want to divide the pools on cpu boundaries.
|
|
*/
|
|
return SVC_POOL_PERCPU;
|
|
}
|
|
|
|
/* default: one global pool */
|
|
return SVC_POOL_GLOBAL;
|
|
}
|
|
|
|
/*
|
|
* Allocate the to_pool[] and pool_to[] arrays.
|
|
* Returns 0 on success or an errno.
|
|
*/
|
|
static int
|
|
svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
|
|
{
|
|
m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
|
|
if (!m->to_pool)
|
|
goto fail;
|
|
m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
|
|
if (!m->pool_to)
|
|
goto fail_free;
|
|
|
|
return 0;
|
|
|
|
fail_free:
|
|
kfree(m->to_pool);
|
|
m->to_pool = NULL;
|
|
fail:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Initialise the pool map for SVC_POOL_PERCPU mode.
|
|
* Returns number of pools or <0 on error.
|
|
*/
|
|
static int
|
|
svc_pool_map_init_percpu(struct svc_pool_map *m)
|
|
{
|
|
unsigned int maxpools = nr_cpu_ids;
|
|
unsigned int pidx = 0;
|
|
unsigned int cpu;
|
|
int err;
|
|
|
|
err = svc_pool_map_alloc_arrays(m, maxpools);
|
|
if (err)
|
|
return err;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
BUG_ON(pidx > maxpools);
|
|
m->to_pool[cpu] = pidx;
|
|
m->pool_to[pidx] = cpu;
|
|
pidx++;
|
|
}
|
|
/* cpus brought online later all get mapped to pool0, sorry */
|
|
|
|
return pidx;
|
|
};
|
|
|
|
|
|
/*
|
|
* Initialise the pool map for SVC_POOL_PERNODE mode.
|
|
* Returns number of pools or <0 on error.
|
|
*/
|
|
static int
|
|
svc_pool_map_init_pernode(struct svc_pool_map *m)
|
|
{
|
|
unsigned int maxpools = nr_node_ids;
|
|
unsigned int pidx = 0;
|
|
unsigned int node;
|
|
int err;
|
|
|
|
err = svc_pool_map_alloc_arrays(m, maxpools);
|
|
if (err)
|
|
return err;
|
|
|
|
for_each_node_with_cpus(node) {
|
|
/* some architectures (e.g. SN2) have cpuless nodes */
|
|
BUG_ON(pidx > maxpools);
|
|
m->to_pool[node] = pidx;
|
|
m->pool_to[pidx] = node;
|
|
pidx++;
|
|
}
|
|
/* nodes brought online later all get mapped to pool0, sorry */
|
|
|
|
return pidx;
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a reference to the global map of cpus to pools (and
|
|
* vice versa). Initialise the map if we're the first user.
|
|
* Returns the number of pools.
|
|
*/
|
|
static unsigned int
|
|
svc_pool_map_get(void)
|
|
{
|
|
struct svc_pool_map *m = &svc_pool_map;
|
|
int npools = -1;
|
|
|
|
mutex_lock(&svc_pool_map_mutex);
|
|
|
|
if (m->count++) {
|
|
mutex_unlock(&svc_pool_map_mutex);
|
|
return m->npools;
|
|
}
|
|
|
|
if (m->mode == SVC_POOL_AUTO)
|
|
m->mode = svc_pool_map_choose_mode();
|
|
|
|
switch (m->mode) {
|
|
case SVC_POOL_PERCPU:
|
|
npools = svc_pool_map_init_percpu(m);
|
|
break;
|
|
case SVC_POOL_PERNODE:
|
|
npools = svc_pool_map_init_pernode(m);
|
|
break;
|
|
}
|
|
|
|
if (npools < 0) {
|
|
/* default, or memory allocation failure */
|
|
npools = 1;
|
|
m->mode = SVC_POOL_GLOBAL;
|
|
}
|
|
m->npools = npools;
|
|
|
|
mutex_unlock(&svc_pool_map_mutex);
|
|
return m->npools;
|
|
}
|
|
|
|
|
|
/*
|
|
* Drop a reference to the global map of cpus to pools.
|
|
* When the last reference is dropped, the map data is
|
|
* freed; this allows the sysadmin to change the pool
|
|
* mode using the pool_mode module option without
|
|
* rebooting or re-loading sunrpc.ko.
|
|
*/
|
|
static void
|
|
svc_pool_map_put(void)
|
|
{
|
|
struct svc_pool_map *m = &svc_pool_map;
|
|
|
|
mutex_lock(&svc_pool_map_mutex);
|
|
|
|
if (!--m->count) {
|
|
kfree(m->to_pool);
|
|
m->to_pool = NULL;
|
|
kfree(m->pool_to);
|
|
m->pool_to = NULL;
|
|
m->npools = 0;
|
|
}
|
|
|
|
mutex_unlock(&svc_pool_map_mutex);
|
|
}
|
|
|
|
|
|
static int svc_pool_map_get_node(unsigned int pidx)
|
|
{
|
|
const struct svc_pool_map *m = &svc_pool_map;
|
|
|
|
if (m->count) {
|
|
if (m->mode == SVC_POOL_PERCPU)
|
|
return cpu_to_node(m->pool_to[pidx]);
|
|
if (m->mode == SVC_POOL_PERNODE)
|
|
return m->pool_to[pidx];
|
|
}
|
|
return NUMA_NO_NODE;
|
|
}
|
|
/*
|
|
* Set the given thread's cpus_allowed mask so that it
|
|
* will only run on cpus in the given pool.
|
|
*/
|
|
static inline void
|
|
svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
|
|
{
|
|
struct svc_pool_map *m = &svc_pool_map;
|
|
unsigned int node = m->pool_to[pidx];
|
|
|
|
/*
|
|
* The caller checks for sv_nrpools > 1, which
|
|
* implies that we've been initialized.
|
|
*/
|
|
WARN_ON_ONCE(m->count == 0);
|
|
if (m->count == 0)
|
|
return;
|
|
|
|
switch (m->mode) {
|
|
case SVC_POOL_PERCPU:
|
|
{
|
|
set_cpus_allowed_ptr(task, cpumask_of(node));
|
|
break;
|
|
}
|
|
case SVC_POOL_PERNODE:
|
|
{
|
|
set_cpus_allowed_ptr(task, cpumask_of_node(node));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Use the mapping mode to choose a pool for a given CPU.
|
|
* Used when enqueueing an incoming RPC. Always returns
|
|
* a non-NULL pool pointer.
|
|
*/
|
|
struct svc_pool *
|
|
svc_pool_for_cpu(struct svc_serv *serv, int cpu)
|
|
{
|
|
struct svc_pool_map *m = &svc_pool_map;
|
|
unsigned int pidx = 0;
|
|
|
|
/*
|
|
* An uninitialised map happens in a pure client when
|
|
* lockd is brought up, so silently treat it the
|
|
* same as SVC_POOL_GLOBAL.
|
|
*/
|
|
if (svc_serv_is_pooled(serv)) {
|
|
switch (m->mode) {
|
|
case SVC_POOL_PERCPU:
|
|
pidx = m->to_pool[cpu];
|
|
break;
|
|
case SVC_POOL_PERNODE:
|
|
pidx = m->to_pool[cpu_to_node(cpu)];
|
|
break;
|
|
}
|
|
}
|
|
return &serv->sv_pools[pidx % serv->sv_nrpools];
|
|
}
|
|
|
|
int svc_rpcb_setup(struct svc_serv *serv, struct net *net)
|
|
{
|
|
int err;
|
|
|
|
err = rpcb_create_local(net);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Remove any stale portmap registrations */
|
|
svc_unregister(serv, net);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_rpcb_setup);
|
|
|
|
void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net)
|
|
{
|
|
svc_unregister(serv, net);
|
|
rpcb_put_local(net);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
|
|
|
|
static int svc_uses_rpcbind(struct svc_serv *serv)
|
|
{
|
|
struct svc_program *progp;
|
|
unsigned int i;
|
|
|
|
for (progp = serv->sv_program; progp; progp = progp->pg_next) {
|
|
for (i = 0; i < progp->pg_nvers; i++) {
|
|
if (progp->pg_vers[i] == NULL)
|
|
continue;
|
|
if (progp->pg_vers[i]->vs_hidden == 0)
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int svc_bind(struct svc_serv *serv, struct net *net)
|
|
{
|
|
if (!svc_uses_rpcbind(serv))
|
|
return 0;
|
|
return svc_rpcb_setup(serv, net);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_bind);
|
|
|
|
/*
|
|
* Create an RPC service
|
|
*/
|
|
static struct svc_serv *
|
|
__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
|
|
void (*shutdown)(struct svc_serv *serv, struct net *net))
|
|
{
|
|
struct svc_serv *serv;
|
|
unsigned int vers;
|
|
unsigned int xdrsize;
|
|
unsigned int i;
|
|
|
|
if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
|
|
return NULL;
|
|
serv->sv_name = prog->pg_name;
|
|
serv->sv_program = prog;
|
|
serv->sv_nrthreads = 1;
|
|
serv->sv_stats = prog->pg_stats;
|
|
if (bufsize > RPCSVC_MAXPAYLOAD)
|
|
bufsize = RPCSVC_MAXPAYLOAD;
|
|
serv->sv_max_payload = bufsize? bufsize : 4096;
|
|
serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
|
|
serv->sv_shutdown = shutdown;
|
|
xdrsize = 0;
|
|
while (prog) {
|
|
prog->pg_lovers = prog->pg_nvers-1;
|
|
for (vers=0; vers<prog->pg_nvers ; vers++)
|
|
if (prog->pg_vers[vers]) {
|
|
prog->pg_hivers = vers;
|
|
if (prog->pg_lovers > vers)
|
|
prog->pg_lovers = vers;
|
|
if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
|
|
xdrsize = prog->pg_vers[vers]->vs_xdrsize;
|
|
}
|
|
prog = prog->pg_next;
|
|
}
|
|
serv->sv_xdrsize = xdrsize;
|
|
INIT_LIST_HEAD(&serv->sv_tempsocks);
|
|
INIT_LIST_HEAD(&serv->sv_permsocks);
|
|
init_timer(&serv->sv_temptimer);
|
|
spin_lock_init(&serv->sv_lock);
|
|
|
|
serv->sv_nrpools = npools;
|
|
serv->sv_pools =
|
|
kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
|
|
GFP_KERNEL);
|
|
if (!serv->sv_pools) {
|
|
kfree(serv);
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; i < serv->sv_nrpools; i++) {
|
|
struct svc_pool *pool = &serv->sv_pools[i];
|
|
|
|
dprintk("svc: initialising pool %u for %s\n",
|
|
i, serv->sv_name);
|
|
|
|
pool->sp_id = i;
|
|
INIT_LIST_HEAD(&pool->sp_threads);
|
|
INIT_LIST_HEAD(&pool->sp_sockets);
|
|
INIT_LIST_HEAD(&pool->sp_all_threads);
|
|
spin_lock_init(&pool->sp_lock);
|
|
}
|
|
|
|
if (svc_uses_rpcbind(serv) && (!serv->sv_shutdown))
|
|
serv->sv_shutdown = svc_rpcb_cleanup;
|
|
|
|
return serv;
|
|
}
|
|
|
|
struct svc_serv *
|
|
svc_create(struct svc_program *prog, unsigned int bufsize,
|
|
void (*shutdown)(struct svc_serv *serv, struct net *net))
|
|
{
|
|
return __svc_create(prog, bufsize, /*npools*/1, shutdown);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_create);
|
|
|
|
struct svc_serv *
|
|
svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
|
|
void (*shutdown)(struct svc_serv *serv, struct net *net),
|
|
svc_thread_fn func, struct module *mod)
|
|
{
|
|
struct svc_serv *serv;
|
|
unsigned int npools = svc_pool_map_get();
|
|
|
|
serv = __svc_create(prog, bufsize, npools, shutdown);
|
|
|
|
if (serv != NULL) {
|
|
serv->sv_function = func;
|
|
serv->sv_module = mod;
|
|
}
|
|
|
|
return serv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_create_pooled);
|
|
|
|
void svc_shutdown_net(struct svc_serv *serv, struct net *net)
|
|
{
|
|
svc_close_net(serv, net);
|
|
|
|
if (serv->sv_shutdown)
|
|
serv->sv_shutdown(serv, net);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_shutdown_net);
|
|
|
|
/*
|
|
* Destroy an RPC service. Should be called with appropriate locking to
|
|
* protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
|
|
*/
|
|
void
|
|
svc_destroy(struct svc_serv *serv)
|
|
{
|
|
dprintk("svc: svc_destroy(%s, %d)\n",
|
|
serv->sv_program->pg_name,
|
|
serv->sv_nrthreads);
|
|
|
|
if (serv->sv_nrthreads) {
|
|
if (--(serv->sv_nrthreads) != 0) {
|
|
svc_sock_update_bufs(serv);
|
|
return;
|
|
}
|
|
} else
|
|
printk("svc_destroy: no threads for serv=%p!\n", serv);
|
|
|
|
del_timer_sync(&serv->sv_temptimer);
|
|
|
|
/*
|
|
* The last user is gone and thus all sockets have to be destroyed to
|
|
* the point. Check this.
|
|
*/
|
|
BUG_ON(!list_empty(&serv->sv_permsocks));
|
|
BUG_ON(!list_empty(&serv->sv_tempsocks));
|
|
|
|
cache_clean_deferred(serv);
|
|
|
|
if (svc_serv_is_pooled(serv))
|
|
svc_pool_map_put();
|
|
|
|
kfree(serv->sv_pools);
|
|
kfree(serv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_destroy);
|
|
|
|
/*
|
|
* Allocate an RPC server's buffer space.
|
|
* We allocate pages and place them in rq_argpages.
|
|
*/
|
|
static int
|
|
svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node)
|
|
{
|
|
unsigned int pages, arghi;
|
|
|
|
/* bc_xprt uses fore channel allocated buffers */
|
|
if (svc_is_backchannel(rqstp))
|
|
return 1;
|
|
|
|
pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
|
|
* We assume one is at most one page
|
|
*/
|
|
arghi = 0;
|
|
WARN_ON_ONCE(pages > RPCSVC_MAXPAGES);
|
|
if (pages > RPCSVC_MAXPAGES)
|
|
pages = RPCSVC_MAXPAGES;
|
|
while (pages) {
|
|
struct page *p = alloc_pages_node(node, GFP_KERNEL, 0);
|
|
if (!p)
|
|
break;
|
|
rqstp->rq_pages[arghi++] = p;
|
|
pages--;
|
|
}
|
|
return pages == 0;
|
|
}
|
|
|
|
/*
|
|
* Release an RPC server buffer
|
|
*/
|
|
static void
|
|
svc_release_buffer(struct svc_rqst *rqstp)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
|
|
if (rqstp->rq_pages[i])
|
|
put_page(rqstp->rq_pages[i]);
|
|
}
|
|
|
|
struct svc_rqst *
|
|
svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
|
|
{
|
|
struct svc_rqst *rqstp;
|
|
|
|
rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node);
|
|
if (!rqstp)
|
|
goto out_enomem;
|
|
|
|
serv->sv_nrthreads++;
|
|
spin_lock_bh(&pool->sp_lock);
|
|
pool->sp_nrthreads++;
|
|
list_add(&rqstp->rq_all, &pool->sp_all_threads);
|
|
spin_unlock_bh(&pool->sp_lock);
|
|
rqstp->rq_server = serv;
|
|
rqstp->rq_pool = pool;
|
|
|
|
rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
|
|
if (!rqstp->rq_argp)
|
|
goto out_thread;
|
|
|
|
rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
|
|
if (!rqstp->rq_resp)
|
|
goto out_thread;
|
|
|
|
if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
|
|
goto out_thread;
|
|
|
|
return rqstp;
|
|
out_thread:
|
|
svc_exit_thread(rqstp);
|
|
out_enomem:
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_prepare_thread);
|
|
|
|
/*
|
|
* Choose a pool in which to create a new thread, for svc_set_num_threads
|
|
*/
|
|
static inline struct svc_pool *
|
|
choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
|
|
{
|
|
if (pool != NULL)
|
|
return pool;
|
|
|
|
return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
|
|
}
|
|
|
|
/*
|
|
* Choose a thread to kill, for svc_set_num_threads
|
|
*/
|
|
static inline struct task_struct *
|
|
choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
|
|
{
|
|
unsigned int i;
|
|
struct task_struct *task = NULL;
|
|
|
|
if (pool != NULL) {
|
|
spin_lock_bh(&pool->sp_lock);
|
|
} else {
|
|
/* choose a pool in round-robin fashion */
|
|
for (i = 0; i < serv->sv_nrpools; i++) {
|
|
pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
|
|
spin_lock_bh(&pool->sp_lock);
|
|
if (!list_empty(&pool->sp_all_threads))
|
|
goto found_pool;
|
|
spin_unlock_bh(&pool->sp_lock);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
found_pool:
|
|
if (!list_empty(&pool->sp_all_threads)) {
|
|
struct svc_rqst *rqstp;
|
|
|
|
/*
|
|
* Remove from the pool->sp_all_threads list
|
|
* so we don't try to kill it again.
|
|
*/
|
|
rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
|
|
list_del_init(&rqstp->rq_all);
|
|
task = rqstp->rq_task;
|
|
}
|
|
spin_unlock_bh(&pool->sp_lock);
|
|
|
|
return task;
|
|
}
|
|
|
|
/*
|
|
* Create or destroy enough new threads to make the number
|
|
* of threads the given number. If `pool' is non-NULL, applies
|
|
* only to threads in that pool, otherwise round-robins between
|
|
* all pools. Caller must ensure that mutual exclusion between this and
|
|
* server startup or shutdown.
|
|
*
|
|
* Destroying threads relies on the service threads filling in
|
|
* rqstp->rq_task, which only the nfs ones do. Assumes the serv
|
|
* has been created using svc_create_pooled().
|
|
*
|
|
* Based on code that used to be in nfsd_svc() but tweaked
|
|
* to be pool-aware.
|
|
*/
|
|
int
|
|
svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
|
|
{
|
|
struct svc_rqst *rqstp;
|
|
struct task_struct *task;
|
|
struct svc_pool *chosen_pool;
|
|
int error = 0;
|
|
unsigned int state = serv->sv_nrthreads-1;
|
|
int node;
|
|
|
|
if (pool == NULL) {
|
|
/* The -1 assumes caller has done a svc_get() */
|
|
nrservs -= (serv->sv_nrthreads-1);
|
|
} else {
|
|
spin_lock_bh(&pool->sp_lock);
|
|
nrservs -= pool->sp_nrthreads;
|
|
spin_unlock_bh(&pool->sp_lock);
|
|
}
|
|
|
|
/* create new threads */
|
|
while (nrservs > 0) {
|
|
nrservs--;
|
|
chosen_pool = choose_pool(serv, pool, &state);
|
|
|
|
node = svc_pool_map_get_node(chosen_pool->sp_id);
|
|
rqstp = svc_prepare_thread(serv, chosen_pool, node);
|
|
if (IS_ERR(rqstp)) {
|
|
error = PTR_ERR(rqstp);
|
|
break;
|
|
}
|
|
|
|
__module_get(serv->sv_module);
|
|
task = kthread_create_on_node(serv->sv_function, rqstp,
|
|
node, "%s", serv->sv_name);
|
|
if (IS_ERR(task)) {
|
|
error = PTR_ERR(task);
|
|
module_put(serv->sv_module);
|
|
svc_exit_thread(rqstp);
|
|
break;
|
|
}
|
|
|
|
rqstp->rq_task = task;
|
|
if (serv->sv_nrpools > 1)
|
|
svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
|
|
|
|
svc_sock_update_bufs(serv);
|
|
wake_up_process(task);
|
|
}
|
|
/* destroy old threads */
|
|
while (nrservs < 0 &&
|
|
(task = choose_victim(serv, pool, &state)) != NULL) {
|
|
send_sig(SIGINT, task, 1);
|
|
nrservs++;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_set_num_threads);
|
|
|
|
/*
|
|
* Called from a server thread as it's exiting. Caller must hold the BKL or
|
|
* the "service mutex", whichever is appropriate for the service.
|
|
*/
|
|
void
|
|
svc_exit_thread(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_serv *serv = rqstp->rq_server;
|
|
struct svc_pool *pool = rqstp->rq_pool;
|
|
|
|
svc_release_buffer(rqstp);
|
|
kfree(rqstp->rq_resp);
|
|
kfree(rqstp->rq_argp);
|
|
kfree(rqstp->rq_auth_data);
|
|
|
|
spin_lock_bh(&pool->sp_lock);
|
|
pool->sp_nrthreads--;
|
|
list_del(&rqstp->rq_all);
|
|
spin_unlock_bh(&pool->sp_lock);
|
|
|
|
kfree(rqstp);
|
|
|
|
/* Release the server */
|
|
if (serv)
|
|
svc_destroy(serv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_exit_thread);
|
|
|
|
/*
|
|
* Register an "inet" protocol family netid with the local
|
|
* rpcbind daemon via an rpcbind v4 SET request.
|
|
*
|
|
* No netconfig infrastructure is available in the kernel, so
|
|
* we map IP_ protocol numbers to netids by hand.
|
|
*
|
|
* Returns zero on success; a negative errno value is returned
|
|
* if any error occurs.
|
|
*/
|
|
static int __svc_rpcb_register4(struct net *net, const u32 program,
|
|
const u32 version,
|
|
const unsigned short protocol,
|
|
const unsigned short port)
|
|
{
|
|
const struct sockaddr_in sin = {
|
|
.sin_family = AF_INET,
|
|
.sin_addr.s_addr = htonl(INADDR_ANY),
|
|
.sin_port = htons(port),
|
|
};
|
|
const char *netid;
|
|
int error;
|
|
|
|
switch (protocol) {
|
|
case IPPROTO_UDP:
|
|
netid = RPCBIND_NETID_UDP;
|
|
break;
|
|
case IPPROTO_TCP:
|
|
netid = RPCBIND_NETID_TCP;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
error = rpcb_v4_register(net, program, version,
|
|
(const struct sockaddr *)&sin, netid);
|
|
|
|
/*
|
|
* User space didn't support rpcbind v4, so retry this
|
|
* registration request with the legacy rpcbind v2 protocol.
|
|
*/
|
|
if (error == -EPROTONOSUPPORT)
|
|
error = rpcb_register(net, program, version, protocol, port);
|
|
|
|
return error;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/*
|
|
* Register an "inet6" protocol family netid with the local
|
|
* rpcbind daemon via an rpcbind v4 SET request.
|
|
*
|
|
* No netconfig infrastructure is available in the kernel, so
|
|
* we map IP_ protocol numbers to netids by hand.
|
|
*
|
|
* Returns zero on success; a negative errno value is returned
|
|
* if any error occurs.
|
|
*/
|
|
static int __svc_rpcb_register6(struct net *net, const u32 program,
|
|
const u32 version,
|
|
const unsigned short protocol,
|
|
const unsigned short port)
|
|
{
|
|
const struct sockaddr_in6 sin6 = {
|
|
.sin6_family = AF_INET6,
|
|
.sin6_addr = IN6ADDR_ANY_INIT,
|
|
.sin6_port = htons(port),
|
|
};
|
|
const char *netid;
|
|
int error;
|
|
|
|
switch (protocol) {
|
|
case IPPROTO_UDP:
|
|
netid = RPCBIND_NETID_UDP6;
|
|
break;
|
|
case IPPROTO_TCP:
|
|
netid = RPCBIND_NETID_TCP6;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
error = rpcb_v4_register(net, program, version,
|
|
(const struct sockaddr *)&sin6, netid);
|
|
|
|
/*
|
|
* User space didn't support rpcbind version 4, so we won't
|
|
* use a PF_INET6 listener.
|
|
*/
|
|
if (error == -EPROTONOSUPPORT)
|
|
error = -EAFNOSUPPORT;
|
|
|
|
return error;
|
|
}
|
|
#endif /* IS_ENABLED(CONFIG_IPV6) */
|
|
|
|
/*
|
|
* Register a kernel RPC service via rpcbind version 4.
|
|
*
|
|
* Returns zero on success; a negative errno value is returned
|
|
* if any error occurs.
|
|
*/
|
|
static int __svc_register(struct net *net, const char *progname,
|
|
const u32 program, const u32 version,
|
|
const int family,
|
|
const unsigned short protocol,
|
|
const unsigned short port)
|
|
{
|
|
int error = -EAFNOSUPPORT;
|
|
|
|
switch (family) {
|
|
case PF_INET:
|
|
error = __svc_rpcb_register4(net, program, version,
|
|
protocol, port);
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case PF_INET6:
|
|
error = __svc_rpcb_register6(net, program, version,
|
|
protocol, port);
|
|
#endif
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* svc_register - register an RPC service with the local portmapper
|
|
* @serv: svc_serv struct for the service to register
|
|
* @net: net namespace for the service to register
|
|
* @family: protocol family of service's listener socket
|
|
* @proto: transport protocol number to advertise
|
|
* @port: port to advertise
|
|
*
|
|
* Service is registered for any address in the passed-in protocol family
|
|
*/
|
|
int svc_register(const struct svc_serv *serv, struct net *net,
|
|
const int family, const unsigned short proto,
|
|
const unsigned short port)
|
|
{
|
|
struct svc_program *progp;
|
|
struct svc_version *vers;
|
|
unsigned int i;
|
|
int error = 0;
|
|
|
|
WARN_ON_ONCE(proto == 0 && port == 0);
|
|
if (proto == 0 && port == 0)
|
|
return -EINVAL;
|
|
|
|
for (progp = serv->sv_program; progp; progp = progp->pg_next) {
|
|
for (i = 0; i < progp->pg_nvers; i++) {
|
|
vers = progp->pg_vers[i];
|
|
if (vers == NULL)
|
|
continue;
|
|
|
|
dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
|
|
progp->pg_name,
|
|
i,
|
|
proto == IPPROTO_UDP? "udp" : "tcp",
|
|
port,
|
|
family,
|
|
vers->vs_hidden ?
|
|
" (but not telling portmap)" : "");
|
|
|
|
if (vers->vs_hidden)
|
|
continue;
|
|
|
|
error = __svc_register(net, progp->pg_name, progp->pg_prog,
|
|
i, family, proto, port);
|
|
|
|
if (vers->vs_rpcb_optnl) {
|
|
error = 0;
|
|
continue;
|
|
}
|
|
|
|
if (error < 0) {
|
|
printk(KERN_WARNING "svc: failed to register "
|
|
"%sv%u RPC service (errno %d).\n",
|
|
progp->pg_name, i, -error);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* If user space is running rpcbind, it should take the v4 UNSET
|
|
* and clear everything for this [program, version]. If user space
|
|
* is running portmap, it will reject the v4 UNSET, but won't have
|
|
* any "inet6" entries anyway. So a PMAP_UNSET should be sufficient
|
|
* in this case to clear all existing entries for [program, version].
|
|
*/
|
|
static void __svc_unregister(struct net *net, const u32 program, const u32 version,
|
|
const char *progname)
|
|
{
|
|
int error;
|
|
|
|
error = rpcb_v4_register(net, program, version, NULL, "");
|
|
|
|
/*
|
|
* User space didn't support rpcbind v4, so retry this
|
|
* request with the legacy rpcbind v2 protocol.
|
|
*/
|
|
if (error == -EPROTONOSUPPORT)
|
|
error = rpcb_register(net, program, version, 0, 0);
|
|
|
|
dprintk("svc: %s(%sv%u), error %d\n",
|
|
__func__, progname, version, error);
|
|
}
|
|
|
|
/*
|
|
* All netids, bind addresses and ports registered for [program, version]
|
|
* are removed from the local rpcbind database (if the service is not
|
|
* hidden) to make way for a new instance of the service.
|
|
*
|
|
* The result of unregistration is reported via dprintk for those who want
|
|
* verification of the result, but is otherwise not important.
|
|
*/
|
|
static void svc_unregister(const struct svc_serv *serv, struct net *net)
|
|
{
|
|
struct svc_program *progp;
|
|
unsigned long flags;
|
|
unsigned int i;
|
|
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
|
|
for (progp = serv->sv_program; progp; progp = progp->pg_next) {
|
|
for (i = 0; i < progp->pg_nvers; i++) {
|
|
if (progp->pg_vers[i] == NULL)
|
|
continue;
|
|
if (progp->pg_vers[i]->vs_hidden)
|
|
continue;
|
|
|
|
dprintk("svc: attempting to unregister %sv%u\n",
|
|
progp->pg_name, i);
|
|
__svc_unregister(net, progp->pg_prog, i, progp->pg_name);
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(¤t->sighand->siglock, flags);
|
|
recalc_sigpending();
|
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
|
}
|
|
|
|
/*
|
|
* dprintk the given error with the address of the client that caused it.
|
|
*/
|
|
#ifdef RPC_DEBUG
|
|
static __printf(2, 3)
|
|
void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
char buf[RPC_MAX_ADDRBUFLEN];
|
|
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
dprintk("svc: %s: %pV", svc_print_addr(rqstp, buf, sizeof(buf)), &vaf);
|
|
|
|
va_end(args);
|
|
}
|
|
#else
|
|
static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
|
|
#endif
|
|
|
|
/*
|
|
* Common routine for processing the RPC request.
|
|
*/
|
|
static int
|
|
svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
|
|
{
|
|
struct svc_program *progp;
|
|
struct svc_version *versp = NULL; /* compiler food */
|
|
struct svc_procedure *procp = NULL;
|
|
struct svc_serv *serv = rqstp->rq_server;
|
|
kxdrproc_t xdr;
|
|
__be32 *statp;
|
|
u32 prog, vers, proc;
|
|
__be32 auth_stat, rpc_stat;
|
|
int auth_res;
|
|
__be32 *reply_statp;
|
|
|
|
rpc_stat = rpc_success;
|
|
|
|
if (argv->iov_len < 6*4)
|
|
goto err_short_len;
|
|
|
|
/* Will be turned off only in gss privacy case: */
|
|
rqstp->rq_splice_ok = true;
|
|
/* Will be turned off only when NFSv4 Sessions are used */
|
|
rqstp->rq_usedeferral = true;
|
|
rqstp->rq_dropme = false;
|
|
|
|
/* Setup reply header */
|
|
rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
|
|
|
|
svc_putu32(resv, rqstp->rq_xid);
|
|
|
|
vers = svc_getnl(argv);
|
|
|
|
/* First words of reply: */
|
|
svc_putnl(resv, 1); /* REPLY */
|
|
|
|
if (vers != 2) /* RPC version number */
|
|
goto err_bad_rpc;
|
|
|
|
/* Save position in case we later decide to reject: */
|
|
reply_statp = resv->iov_base + resv->iov_len;
|
|
|
|
svc_putnl(resv, 0); /* ACCEPT */
|
|
|
|
rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
|
|
rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
|
|
rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
|
|
|
|
for (progp = serv->sv_program; progp; progp = progp->pg_next)
|
|
if (prog == progp->pg_prog)
|
|
break;
|
|
|
|
/*
|
|
* Decode auth data, and add verifier to reply buffer.
|
|
* We do this before anything else in order to get a decent
|
|
* auth verifier.
|
|
*/
|
|
auth_res = svc_authenticate(rqstp, &auth_stat);
|
|
/* Also give the program a chance to reject this call: */
|
|
if (auth_res == SVC_OK && progp) {
|
|
auth_stat = rpc_autherr_badcred;
|
|
auth_res = progp->pg_authenticate(rqstp);
|
|
}
|
|
switch (auth_res) {
|
|
case SVC_OK:
|
|
break;
|
|
case SVC_GARBAGE:
|
|
goto err_garbage;
|
|
case SVC_SYSERR:
|
|
rpc_stat = rpc_system_err;
|
|
goto err_bad;
|
|
case SVC_DENIED:
|
|
goto err_bad_auth;
|
|
case SVC_CLOSE:
|
|
if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
|
|
svc_close_xprt(rqstp->rq_xprt);
|
|
case SVC_DROP:
|
|
goto dropit;
|
|
case SVC_COMPLETE:
|
|
goto sendit;
|
|
}
|
|
|
|
if (progp == NULL)
|
|
goto err_bad_prog;
|
|
|
|
if (vers >= progp->pg_nvers ||
|
|
!(versp = progp->pg_vers[vers]))
|
|
goto err_bad_vers;
|
|
|
|
procp = versp->vs_proc + proc;
|
|
if (proc >= versp->vs_nproc || !procp->pc_func)
|
|
goto err_bad_proc;
|
|
rqstp->rq_procinfo = procp;
|
|
|
|
/* Syntactic check complete */
|
|
serv->sv_stats->rpccnt++;
|
|
|
|
/* Build the reply header. */
|
|
statp = resv->iov_base +resv->iov_len;
|
|
svc_putnl(resv, RPC_SUCCESS);
|
|
|
|
/* Bump per-procedure stats counter */
|
|
procp->pc_count++;
|
|
|
|
/* Initialize storage for argp and resp */
|
|
memset(rqstp->rq_argp, 0, procp->pc_argsize);
|
|
memset(rqstp->rq_resp, 0, procp->pc_ressize);
|
|
|
|
/* un-reserve some of the out-queue now that we have a
|
|
* better idea of reply size
|
|
*/
|
|
if (procp->pc_xdrressize)
|
|
svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
|
|
|
|
/* Call the function that processes the request. */
|
|
if (!versp->vs_dispatch) {
|
|
/* Decode arguments */
|
|
xdr = procp->pc_decode;
|
|
if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
|
|
goto err_garbage;
|
|
|
|
*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
|
|
|
|
/* Encode reply */
|
|
if (rqstp->rq_dropme) {
|
|
if (procp->pc_release)
|
|
procp->pc_release(rqstp, NULL, rqstp->rq_resp);
|
|
goto dropit;
|
|
}
|
|
if (*statp == rpc_success &&
|
|
(xdr = procp->pc_encode) &&
|
|
!xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
|
|
dprintk("svc: failed to encode reply\n");
|
|
/* serv->sv_stats->rpcsystemerr++; */
|
|
*statp = rpc_system_err;
|
|
}
|
|
} else {
|
|
dprintk("svc: calling dispatcher\n");
|
|
if (!versp->vs_dispatch(rqstp, statp)) {
|
|
/* Release reply info */
|
|
if (procp->pc_release)
|
|
procp->pc_release(rqstp, NULL, rqstp->rq_resp);
|
|
goto dropit;
|
|
}
|
|
}
|
|
|
|
/* Check RPC status result */
|
|
if (*statp != rpc_success)
|
|
resv->iov_len = ((void*)statp) - resv->iov_base + 4;
|
|
|
|
/* Release reply info */
|
|
if (procp->pc_release)
|
|
procp->pc_release(rqstp, NULL, rqstp->rq_resp);
|
|
|
|
if (procp->pc_encode == NULL)
|
|
goto dropit;
|
|
|
|
sendit:
|
|
if (svc_authorise(rqstp))
|
|
goto dropit;
|
|
return 1; /* Caller can now send it */
|
|
|
|
dropit:
|
|
svc_authorise(rqstp); /* doesn't hurt to call this twice */
|
|
dprintk("svc: svc_process dropit\n");
|
|
return 0;
|
|
|
|
err_short_len:
|
|
svc_printk(rqstp, "short len %Zd, dropping request\n",
|
|
argv->iov_len);
|
|
|
|
goto dropit; /* drop request */
|
|
|
|
err_bad_rpc:
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_putnl(resv, 1); /* REJECT */
|
|
svc_putnl(resv, 0); /* RPC_MISMATCH */
|
|
svc_putnl(resv, 2); /* Only RPCv2 supported */
|
|
svc_putnl(resv, 2);
|
|
goto sendit;
|
|
|
|
err_bad_auth:
|
|
dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
|
|
serv->sv_stats->rpcbadauth++;
|
|
/* Restore write pointer to location of accept status: */
|
|
xdr_ressize_check(rqstp, reply_statp);
|
|
svc_putnl(resv, 1); /* REJECT */
|
|
svc_putnl(resv, 1); /* AUTH_ERROR */
|
|
svc_putnl(resv, ntohl(auth_stat)); /* status */
|
|
goto sendit;
|
|
|
|
err_bad_prog:
|
|
dprintk("svc: unknown program %d\n", prog);
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_putnl(resv, RPC_PROG_UNAVAIL);
|
|
goto sendit;
|
|
|
|
err_bad_vers:
|
|
svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
|
|
vers, prog, progp->pg_name);
|
|
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_putnl(resv, RPC_PROG_MISMATCH);
|
|
svc_putnl(resv, progp->pg_lovers);
|
|
svc_putnl(resv, progp->pg_hivers);
|
|
goto sendit;
|
|
|
|
err_bad_proc:
|
|
svc_printk(rqstp, "unknown procedure (%d)\n", proc);
|
|
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_putnl(resv, RPC_PROC_UNAVAIL);
|
|
goto sendit;
|
|
|
|
err_garbage:
|
|
svc_printk(rqstp, "failed to decode args\n");
|
|
|
|
rpc_stat = rpc_garbage_args;
|
|
err_bad:
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_putnl(resv, ntohl(rpc_stat));
|
|
goto sendit;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_process);
|
|
|
|
/*
|
|
* Process the RPC request.
|
|
*/
|
|
int
|
|
svc_process(struct svc_rqst *rqstp)
|
|
{
|
|
struct kvec *argv = &rqstp->rq_arg.head[0];
|
|
struct kvec *resv = &rqstp->rq_res.head[0];
|
|
struct svc_serv *serv = rqstp->rq_server;
|
|
u32 dir;
|
|
|
|
/*
|
|
* Setup response xdr_buf.
|
|
* Initially it has just one page
|
|
*/
|
|
rqstp->rq_next_page = &rqstp->rq_respages[1];
|
|
resv->iov_base = page_address(rqstp->rq_respages[0]);
|
|
resv->iov_len = 0;
|
|
rqstp->rq_res.pages = rqstp->rq_respages + 1;
|
|
rqstp->rq_res.len = 0;
|
|
rqstp->rq_res.page_base = 0;
|
|
rqstp->rq_res.page_len = 0;
|
|
rqstp->rq_res.buflen = PAGE_SIZE;
|
|
rqstp->rq_res.tail[0].iov_base = NULL;
|
|
rqstp->rq_res.tail[0].iov_len = 0;
|
|
|
|
rqstp->rq_xid = svc_getu32(argv);
|
|
|
|
dir = svc_getnl(argv);
|
|
if (dir != 0) {
|
|
/* direction != CALL */
|
|
svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
|
|
serv->sv_stats->rpcbadfmt++;
|
|
svc_drop(rqstp);
|
|
return 0;
|
|
}
|
|
|
|
/* Returns 1 for send, 0 for drop */
|
|
if (svc_process_common(rqstp, argv, resv))
|
|
return svc_send(rqstp);
|
|
else {
|
|
svc_drop(rqstp);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
/*
|
|
* Process a backchannel RPC request that arrived over an existing
|
|
* outbound connection
|
|
*/
|
|
int
|
|
bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
|
|
struct svc_rqst *rqstp)
|
|
{
|
|
struct kvec *argv = &rqstp->rq_arg.head[0];
|
|
struct kvec *resv = &rqstp->rq_res.head[0];
|
|
|
|
/* Build the svc_rqst used by the common processing routine */
|
|
rqstp->rq_xprt = serv->sv_bc_xprt;
|
|
rqstp->rq_xid = req->rq_xid;
|
|
rqstp->rq_prot = req->rq_xprt->prot;
|
|
rqstp->rq_server = serv;
|
|
|
|
rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
|
|
memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
|
|
memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
|
|
memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
|
|
|
|
/* reset result send buffer "put" position */
|
|
resv->iov_len = 0;
|
|
|
|
if (rqstp->rq_prot != IPPROTO_TCP) {
|
|
printk(KERN_ERR "No support for Non-TCP transports!\n");
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* Skip the next two words because they've already been
|
|
* processed in the trasport
|
|
*/
|
|
svc_getu32(argv); /* XID */
|
|
svc_getnl(argv); /* CALLDIR */
|
|
|
|
/* Returns 1 for send, 0 for drop */
|
|
if (svc_process_common(rqstp, argv, resv)) {
|
|
memcpy(&req->rq_snd_buf, &rqstp->rq_res,
|
|
sizeof(req->rq_snd_buf));
|
|
return bc_send(req);
|
|
} else {
|
|
/* drop request */
|
|
xprt_free_bc_request(req);
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(bc_svc_process);
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
/*
|
|
* Return (transport-specific) limit on the rpc payload.
|
|
*/
|
|
u32 svc_max_payload(const struct svc_rqst *rqstp)
|
|
{
|
|
u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
|
|
|
|
if (rqstp->rq_server->sv_max_payload < max)
|
|
max = rqstp->rq_server->sv_max_payload;
|
|
return max;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_max_payload);
|