svc.c 28.5 KB
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/*
 * linux/net/sunrpc/svc.c
 *
 * High-level RPC service routines
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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 *
 * Multiple threads pools and NUMAisation
 * Copyright (c) 2006 Silicon Graphics, Inc.
 * by Greg Banks <gnb@melbourne.sgi.com>
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 */

#include <linux/linkage.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/mm.h>
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#include <linux/interrupt.h>
#include <linux/module.h>
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#include <linux/kthread.h>
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#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>

#define RPCDBG_FACILITY	RPCDBG_SVCDSP

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static void svc_unregister(const struct svc_serv *serv);

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#define svc_serv_is_pooled(serv)    ((serv)->sv_function)

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/*
 * Mode for mapping cpus to pools.
 */
enum {
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	SVC_POOL_AUTO = -1,	/* choose one of the others */
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	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 */
};
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#define SVC_POOL_DEFAULT	SVC_POOL_GLOBAL
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/*
 * Structure for mapping cpus to pools and vice versa.
 * Setup once during sunrpc initialisation.
 */
static struct svc_pool_map {
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	int count;			/* How many svc_servs use us */
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	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 = {
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	.count = 0,
	.mode = SVC_POOL_DEFAULT
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};
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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);
	}
}
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module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
		 &svc_pool_map.mode, 0644);
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/*
 * Detect best pool mapping mode heuristically,
 * according to the machine's topology.
 */
static int
svc_pool_map_choose_mode(void)
{
	unsigned int node;

	if (num_online_nodes() > 1) {
		/*
		 * Actually have multiple NUMA nodes,
		 * so split pools on NUMA node boundaries
		 */
		return SVC_POOL_PERNODE;
	}

	node = any_online_node(node_online_map);
	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);
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)
{
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	unsigned int maxpools = nr_cpu_ids;
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	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)
{
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	unsigned int maxpools = nr_node_ids;
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	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;
}


/*
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 * 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.
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 */
static unsigned int
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svc_pool_map_get(void)
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{
	struct svc_pool_map *m = &svc_pool_map;
	int npools = -1;

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	mutex_lock(&svc_pool_map_mutex);

	if (m->count++) {
		mutex_unlock(&svc_pool_map_mutex);
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		return m->npools;
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	}
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	if (m->mode == SVC_POOL_AUTO)
		m->mode = svc_pool_map_choose_mode();
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	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;

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	mutex_unlock(&svc_pool_map_mutex);
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	return m->npools;
}

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/*
 * 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) {
		m->mode = SVC_POOL_DEFAULT;
		kfree(m->to_pool);
		kfree(m->pool_to);
		m->npools = 0;
	}

	mutex_unlock(&svc_pool_map_mutex);
}


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/*
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 * Set the given thread's cpus_allowed mask so that it
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 * will only run on cpus in the given pool.
 */
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static inline void
svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
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{
	struct svc_pool_map *m = &svc_pool_map;
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	unsigned int node = m->pool_to[pidx];
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	/*
	 * The caller checks for sv_nrpools > 1, which
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	 * implies that we've been initialized.
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	 */
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	BUG_ON(m->count == 0);
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	switch (m->mode) {
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	case SVC_POOL_PERCPU:
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	{
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		set_cpus_allowed_ptr(task, &cpumask_of_cpu(node));
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		break;
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	}
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	case SVC_POOL_PERNODE:
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	{
		node_to_cpumask_ptr(nodecpumask, node);
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		set_cpus_allowed_ptr(task, nodecpumask);
		break;
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	}
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	}
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}

/*
 * 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;

	/*
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	 * An uninitialised map happens in a pure client when
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	 * lockd is brought up, so silently treat it the
	 * same as SVC_POOL_GLOBAL.
	 */
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	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;
		}
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	}
	return &serv->sv_pools[pidx % serv->sv_nrpools];
}


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/*
 * Create an RPC service
 */
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static struct svc_serv *
__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
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	   sa_family_t family, void (*shutdown)(struct svc_serv *serv))
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{
	struct svc_serv	*serv;
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	unsigned int vers;
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	unsigned int xdrsize;
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	unsigned int i;
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	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
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		return NULL;
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	serv->sv_family    = family;
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	serv->sv_name      = prog->pg_name;
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	serv->sv_program   = prog;
	serv->sv_nrthreads = 1;
	serv->sv_stats     = prog->pg_stats;
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	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);
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	serv->sv_shutdown  = shutdown;
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	xdrsize = 0;
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	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;
	}
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	serv->sv_xdrsize   = xdrsize;
	INIT_LIST_HEAD(&serv->sv_tempsocks);
	INIT_LIST_HEAD(&serv->sv_permsocks);
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	init_timer(&serv->sv_temptimer);
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	spin_lock_init(&serv->sv_lock);

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	serv->sv_nrpools = npools;
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	serv->sv_pools =
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		kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
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			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];

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		dprintk("svc: initialising pool %u for %s\n",
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				i, serv->sv_name);

		pool->sp_id = i;
		INIT_LIST_HEAD(&pool->sp_threads);
		INIT_LIST_HEAD(&pool->sp_sockets);
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		INIT_LIST_HEAD(&pool->sp_all_threads);
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		spin_lock_init(&pool->sp_lock);
	}

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	/* Remove any stale portmap registrations */
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	svc_unregister(serv);
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	return serv;
}

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struct svc_serv *
svc_create(struct svc_program *prog, unsigned int bufsize,
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		sa_family_t family, void (*shutdown)(struct svc_serv *serv))
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{
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	return __svc_create(prog, bufsize, /*npools*/1, family, shutdown);
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}
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EXPORT_SYMBOL(svc_create);
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struct svc_serv *
svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
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		  sa_family_t family, void (*shutdown)(struct svc_serv *serv),
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		  svc_thread_fn func, struct module *mod)
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{
	struct svc_serv *serv;
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	unsigned int npools = svc_pool_map_get();
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	serv = __svc_create(prog, bufsize, npools, family, shutdown);
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	if (serv != NULL) {
		serv->sv_function = func;
		serv->sv_module = mod;
	}

	return serv;
}
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EXPORT_SYMBOL(svc_create_pooled);
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/*
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 * Destroy an RPC service. Should be called with appropriate locking to
 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
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 */
void
svc_destroy(struct svc_serv *serv)
{
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	dprintk("svc: svc_destroy(%s, %d)\n",
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				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);

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	del_timer_sync(&serv->sv_temptimer);

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	svc_close_all(&serv->sv_tempsocks);
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	if (serv->sv_shutdown)
		serv->sv_shutdown(serv);

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	svc_close_all(&serv->sv_permsocks);
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	BUG_ON(!list_empty(&serv->sv_permsocks));
	BUG_ON(!list_empty(&serv->sv_tempsocks));
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	cache_clean_deferred(serv);

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	if (svc_serv_is_pooled(serv))
		svc_pool_map_put();

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	svc_unregister(serv);
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	kfree(serv->sv_pools);
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	kfree(serv);
}
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EXPORT_SYMBOL(svc_destroy);
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/*
 * 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)
{
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	unsigned int pages, arghi;
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	pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
				       * We assume one is at most one page
				       */
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	arghi = 0;
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	BUG_ON(pages > RPCSVC_MAXPAGES);
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	while (pages) {
		struct page *p = alloc_page(GFP_KERNEL);
		if (!p)
			break;
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		rqstp->rq_pages[arghi++] = p;
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		pages--;
	}
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	return pages == 0;
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}

/*
 * Release an RPC server buffer
 */
static void
svc_release_buffer(struct svc_rqst *rqstp)
{
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	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
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		if (rqstp->rq_pages[i])
			put_page(rqstp->rq_pages[i]);
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}

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struct svc_rqst *
svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
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{
	struct svc_rqst	*rqstp;

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	rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
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	if (!rqstp)
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		goto out_enomem;
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	init_waitqueue_head(&rqstp->rq_wait);

	serv->sv_nrthreads++;
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	spin_lock_bh(&pool->sp_lock);
	pool->sp_nrthreads++;
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	list_add(&rqstp->rq_all, &pool->sp_all_threads);
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	spin_unlock_bh(&pool->sp_lock);
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	rqstp->rq_server = serv;
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	rqstp->rq_pool = pool;
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	rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
	if (!rqstp->rq_argp)
		goto out_thread;

	rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
	if (!rqstp->rq_resp)
		goto out_thread;

	if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
		goto out_thread;

	return rqstp;
out_thread:
	svc_exit_thread(rqstp);
out_enomem:
	return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(svc_prepare_thread);

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/*
 * 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;

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	return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
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}

/*
 * 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 */
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		for (i = 0; i < serv->sv_nrpools; i++) {
			pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
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			spin_lock_bh(&pool->sp_lock);
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			if (!list_empty(&pool->sp_all_threads))
				goto found_pool;
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			spin_unlock_bh(&pool->sp_lock);
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		}
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		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;
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	}
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	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.  Must be called with a svc_get() reference and
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 * the BKL or another lock to protect access to svc_serv fields.
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 *
 * 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)
{
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	struct svc_rqst	*rqstp;
	struct task_struct *task;
	struct svc_pool *chosen_pool;
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	int error = 0;
	unsigned int state = serv->sv_nrthreads-1;

	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--;
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		chosen_pool = choose_pool(serv, pool, &state);

		rqstp = svc_prepare_thread(serv, chosen_pool);
		if (IS_ERR(rqstp)) {
			error = PTR_ERR(rqstp);
			break;
		}

667
		__module_get(serv->sv_module);
668 669 670
		task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
		if (IS_ERR(task)) {
			error = PTR_ERR(task);
671
			module_put(serv->sv_module);
672
			svc_exit_thread(rqstp);
673 674
			break;
		}
675 676 677 678 679 680 681

		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);
682 683 684
	}
	/* destroy old threads */
	while (nrservs < 0 &&
685
	       (task = choose_victim(serv, pool, &state)) != NULL) {
686
		send_sig(SIGINT, task, 1);
687 688 689 690 691
		nrservs++;
	}

	return error;
}
692
EXPORT_SYMBOL(svc_set_num_threads);
693

694
/*
695 696
 * Called from a server thread as it's exiting. Caller must hold the BKL or
 * the "service mutex", whichever is appropriate for the service.
L
Linus Torvalds 已提交
697 698 699 700 701
 */
void
svc_exit_thread(struct svc_rqst *rqstp)
{
	struct svc_serv	*serv = rqstp->rq_server;
702
	struct svc_pool	*pool = rqstp->rq_pool;
L
Linus Torvalds 已提交
703 704

	svc_release_buffer(rqstp);
J
Jesper Juhl 已提交
705 706 707
	kfree(rqstp->rq_resp);
	kfree(rqstp->rq_argp);
	kfree(rqstp->rq_auth_data);
708 709 710

	spin_lock_bh(&pool->sp_lock);
	pool->sp_nrthreads--;
711
	list_del(&rqstp->rq_all);
712 713
	spin_unlock_bh(&pool->sp_lock);

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714 715 716 717 718 719
	kfree(rqstp);

	/* Release the server */
	if (serv)
		svc_destroy(serv);
}
720
EXPORT_SYMBOL(svc_exit_thread);
L
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721

722
#ifdef CONFIG_SUNRPC_REGISTER_V4
723

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724
/*
725 726
 * Register an "inet" protocol family netid with the local
 * rpcbind daemon via an rpcbind v4 SET request.
727
 *
728 729
 * No netconfig infrastructure is available in the kernel, so
 * we map IP_ protocol numbers to netids by hand.
730
 *
731 732
 * Returns zero on success; a negative errno value is returned
 * if any error occurs.
L
Linus Torvalds 已提交
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 */
734 735 736
static int __svc_rpcb_register4(const u32 program, const u32 version,
				const unsigned short protocol,
				const unsigned short port)
737 738 739 740 741 742
{
	struct sockaddr_in sin = {
		.sin_family		= AF_INET,
		.sin_addr.s_addr	= htonl(INADDR_ANY),
		.sin_port		= htons(port),
	};
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
	char *netid;

	switch (protocol) {
	case IPPROTO_UDP:
		netid = RPCBIND_NETID_UDP;
		break;
	case IPPROTO_TCP:
		netid = RPCBIND_NETID_TCP;
		break;
	default:
		return -EPROTONOSUPPORT;
	}

	return rpcb_v4_register(program, version,
				(struct sockaddr *)&sin, netid);
}

/*
 * 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(const u32 program, const u32 version,
				const unsigned short protocol,
				const unsigned short port)
{
774 775 776 777 778 779 780
	struct sockaddr_in6 sin6 = {
		.sin6_family		= AF_INET6,
		.sin6_addr		= IN6ADDR_ANY_INIT,
		.sin6_port		= htons(port),
	};
	char *netid;

781 782 783
	switch (protocol) {
	case IPPROTO_UDP:
		netid = RPCBIND_NETID_UDP6;
784
		break;
785
	case IPPROTO_TCP:
786 787 788
		netid = RPCBIND_NETID_TCP6;
		break;
	default:
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828
		return -EPROTONOSUPPORT;
	}

	return rpcb_v4_register(program, version,
				(struct sockaddr *)&sin6, netid);
}

/*
 * 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(const u32 program, const u32 version,
			  const sa_family_t family,
			  const unsigned short protocol,
			  const unsigned short port)
{
	int error;

	switch (family) {
	case AF_INET:
		return __svc_rpcb_register4(program, version,
						protocol, port);
	case AF_INET6:
		error = __svc_rpcb_register6(program, version,
						protocol, port);
		if (error < 0)
			return error;

		/*
		 * Work around bug in some versions of Linux rpcbind
		 * which don't allow registration of both inet and
		 * inet6 netids.
		 *
		 * Error return ignored for now.
		 */
		__svc_rpcb_register4(program, version,
						protocol, port);
		return 0;
829 830
	}

831
	return -EAFNOSUPPORT;
832
}
833 834 835 836 837 838 839 840 841

#else	/* CONFIG_SUNRPC_REGISTER_V4 */

/*
 * Register a kernel RPC service via rpcbind version 2.
 *
 * Returns zero on success; a negative errno value is returned
 * if any error occurs.
 */
842 843 844 845 846 847 848 849 850 851
static int __svc_register(const u32 program, const u32 version,
			  sa_family_t family,
			  const unsigned short protocol,
			  const unsigned short port)
{
	if (family != AF_INET)
		return -EAFNOSUPPORT;

	return rpcb_register(program, version, protocol, port);
}
852 853

#endif /* CONFIG_SUNRPC_REGISTER_V4 */
854 855 856 857 858 859 860 861 862 863 864

/**
 * svc_register - register an RPC service with the local portmapper
 * @serv: svc_serv struct for the service to register
 * @proto: transport protocol number to advertise
 * @port: port to advertise
 *
 * Service is registered for any address in serv's address family
 */
int svc_register(const struct svc_serv *serv, const unsigned short proto,
		 const unsigned short port)
L
Linus Torvalds 已提交
865 866
{
	struct svc_program	*progp;
867
	unsigned int		i;
868
	int			error = 0;
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869

870
	BUG_ON(proto == 0 && port == 0);
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871

872 873 874 875 876
	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;

877
			dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
878
					progp->pg_name,
879
					i,
880 881
					proto == IPPROTO_UDP?  "udp" : "tcp",
					port,
882
					serv->sv_family,
883 884 885 886 887 888
					progp->pg_vers[i]->vs_hidden?
						" (but not telling portmap)" : "");

			if (progp->pg_vers[i]->vs_hidden)
				continue;

889 890
			error = __svc_register(progp->pg_prog, i,
						serv->sv_family, proto, port);
891 892
			if (error < 0)
				break;
L
Linus Torvalds 已提交
893 894 895
		}
	}

896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
	return error;
}

/*
 * All transport protocols and ports for this service are removed
 * from the local rpcbind database if the service is not hidden.
 *
 * The result of unregistration is reported via dprintk for those
 * who want verification of the result, but is otherwise not
 * important.
 *
 * The local rpcbind daemon listens on either only IPv6 or only
 * IPv4.  The kernel can't tell how it's configured.  However,
 * AF_INET addresses are mapped to AF_INET6 in IPv6-only config-
 * urations, so even an unregistration request on AF_INET will
 * get to a local rpcbind daemon listening only on AF_INET6.  So
 * we always unregister via AF_INET.
 *
 * At this point we don't need rpcbind version 4 for unregis-
 * tration:  A v2 UNSET request will clear all transports (netids),
 * addresses, and address families for [program, version].
 */
static void svc_unregister(const struct svc_serv *serv)
{
	struct svc_program *progp;
	unsigned long flags;
	unsigned int i;
	int error;

	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;

			error = rpcb_register(progp->pg_prog, i, 0, 0);
			dprintk("svc: svc_unregister(%sv%u), error %d\n",
					progp->pg_name, i, error);
		}
L
Linus Torvalds 已提交
938 939
	}

940 941 942
	spin_lock_irqsave(&current->sighand->siglock, flags);
	recalc_sigpending();
	spin_unlock_irqrestore(&current->sighand->siglock, flags);
L
Linus Torvalds 已提交
943 944
}

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
/*
 * Printk the given error with the address of the client that caused it.
 */
static int
__attribute__ ((format (printf, 2, 3)))
svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
{
	va_list args;
	int 	r;
	char 	buf[RPC_MAX_ADDRBUFLEN];

	if (!net_ratelimit())
		return 0;

	printk(KERN_WARNING "svc: %s: ",
		svc_print_addr(rqstp, buf, sizeof(buf)));

	va_start(args, fmt);
	r = vprintk(fmt, args);
	va_end(args);

	return r;
}

L
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969 970 971 972
/*
 * Process the RPC request.
 */
int
973
svc_process(struct svc_rqst *rqstp)
L
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974 975 976 977 978 979
{
	struct svc_program	*progp;
	struct svc_version	*versp = NULL;	/* compiler food */
	struct svc_procedure	*procp = NULL;
	struct kvec *		argv = &rqstp->rq_arg.head[0];
	struct kvec *		resv = &rqstp->rq_res.head[0];
980
	struct svc_serv		*serv = rqstp->rq_server;
L
Linus Torvalds 已提交
981
	kxdrproc_t		xdr;
982 983 984
	__be32			*statp;
	u32			dir, prog, vers, proc;
	__be32			auth_stat, rpc_stat;
L
Linus Torvalds 已提交
985
	int			auth_res;
986
	__be32			*reply_statp;
L
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987 988 989 990 991 992 993

	rpc_stat = rpc_success;

	if (argv->iov_len < 6*4)
		goto err_short_len;

	/* setup response xdr_buf.
994
	 * Initially it has just one page
L
Linus Torvalds 已提交
995
	 */
996
	rqstp->rq_resused = 1;
L
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997 998
	resv->iov_base = page_address(rqstp->rq_respages[0]);
	resv->iov_len = 0;
999
	rqstp->rq_res.pages = rqstp->rq_respages + 1;
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Linus Torvalds 已提交
1000 1001 1002
	rqstp->rq_res.len = 0;
	rqstp->rq_res.page_base = 0;
	rqstp->rq_res.page_len = 0;
1003
	rqstp->rq_res.buflen = PAGE_SIZE;
1004
	rqstp->rq_res.tail[0].iov_base = NULL;
L
Linus Torvalds 已提交
1005
	rqstp->rq_res.tail[0].iov_len = 0;
1006
	/* Will be turned off only in gss privacy case: */
1007
	rqstp->rq_splice_ok = 1;
T
Tom Tucker 已提交
1008 1009 1010

	/* Setup reply header */
	rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
L
Linus Torvalds 已提交
1011 1012 1013 1014

	rqstp->rq_xid = svc_getu32(argv);
	svc_putu32(resv, rqstp->rq_xid);

A
Alexey Dobriyan 已提交
1015 1016
	dir  = svc_getnl(argv);
	vers = svc_getnl(argv);
L
Linus Torvalds 已提交
1017 1018

	/* First words of reply: */
A
Alexey Dobriyan 已提交
1019
	svc_putnl(resv, 1);		/* REPLY */
L
Linus Torvalds 已提交
1020 1021 1022 1023 1024 1025 1026

	if (dir != 0)		/* direction != CALL */
		goto err_bad_dir;
	if (vers != 2)		/* RPC version number */
		goto err_bad_rpc;

	/* Save position in case we later decide to reject: */
1027
	reply_statp = resv->iov_base + resv->iov_len;
L
Linus Torvalds 已提交
1028

A
Alexey Dobriyan 已提交
1029
	svc_putnl(resv, 0);		/* ACCEPT */
L
Linus Torvalds 已提交
1030

A
Alexey Dobriyan 已提交
1031 1032 1033
	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 */
L
Linus Torvalds 已提交
1034 1035

	progp = serv->sv_program;
1036 1037 1038 1039 1040

	for (progp = serv->sv_program; progp; progp = progp->pg_next)
		if (prog == progp->pg_prog)
			break;

L
Linus Torvalds 已提交
1041 1042 1043 1044 1045 1046 1047
	/*
	 * 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: */
1048
	if (auth_res == SVC_OK && progp) {
L
Linus Torvalds 已提交
1049 1050 1051 1052 1053 1054 1055
		auth_stat = rpc_autherr_badcred;
		auth_res = progp->pg_authenticate(rqstp);
	}
	switch (auth_res) {
	case SVC_OK:
		break;
	case SVC_GARBAGE:
1056
		goto err_garbage;
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Linus Torvalds 已提交
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
	case SVC_SYSERR:
		rpc_stat = rpc_system_err;
		goto err_bad;
	case SVC_DENIED:
		goto err_bad_auth;
	case SVC_DROP:
		goto dropit;
	case SVC_COMPLETE:
		goto sendit;
	}
1067

1068
	if (progp == NULL)
L
Linus Torvalds 已提交
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
		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_server   = serv;
	rqstp->rq_procinfo = procp;

	/* Syntactic check complete */
	serv->sv_stats->rpccnt++;

	/* Build the reply header. */
	statp = resv->iov_base +resv->iov_len;
A
Alexey Dobriyan 已提交
1086
	svc_putnl(resv, RPC_SUCCESS);
L
Linus Torvalds 已提交
1087 1088 1089 1090 1091 1092 1093 1094

	/* 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);

1095
	/* un-reserve some of the out-queue now that we have a
L
Linus Torvalds 已提交
1096 1097 1098
	 * better idea of reply size
	 */
	if (procp->pc_xdrressize)
1099
		svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
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Linus Torvalds 已提交
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110

	/* 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 */
1111 1112 1113 1114 1115
		if (*statp == rpc_drop_reply) {
			if (procp->pc_release)
				procp->pc_release(rqstp, NULL, rqstp->rq_resp);
			goto dropit;
		}
L
Linus Torvalds 已提交
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
		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 svc_send(rqstp);

 dropit:
	svc_authorise(rqstp);	/* doesn't hurt to call this twice */
	dprintk("svc: svc_process dropit\n");
	svc_drop(rqstp);
	return 0;

err_short_len:
1155 1156
	svc_printk(rqstp, "short len %Zd, dropping request\n",
			argv->iov_len);
1157

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Linus Torvalds 已提交
1158 1159 1160
	goto dropit;			/* drop request */

err_bad_dir:
1161
	svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1162

L
Linus Torvalds 已提交
1163 1164 1165 1166 1167
	serv->sv_stats->rpcbadfmt++;
	goto dropit;			/* drop request */

err_bad_rpc:
	serv->sv_stats->rpcbadfmt++;
A
Alexey Dobriyan 已提交
1168 1169 1170 1171
	svc_putnl(resv, 1);	/* REJECT */
	svc_putnl(resv, 0);	/* RPC_MISMATCH */
	svc_putnl(resv, 2);	/* Only RPCv2 supported */
	svc_putnl(resv, 2);
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Linus Torvalds 已提交
1172 1173 1174 1175 1176 1177
	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: */
1178
	xdr_ressize_check(rqstp, reply_statp);
A
Alexey Dobriyan 已提交
1179 1180 1181
	svc_putnl(resv, 1);	/* REJECT */
	svc_putnl(resv, 1);	/* AUTH_ERROR */
	svc_putnl(resv, ntohl(auth_stat));	/* status */
L
Linus Torvalds 已提交
1182 1183 1184
	goto sendit;

err_bad_prog:
1185
	dprintk("svc: unknown program %d\n", prog);
L
Linus Torvalds 已提交
1186
	serv->sv_stats->rpcbadfmt++;
A
Alexey Dobriyan 已提交
1187
	svc_putnl(resv, RPC_PROG_UNAVAIL);
L
Linus Torvalds 已提交
1188 1189 1190
	goto sendit;

err_bad_vers:
1191
	svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1192 1193
		       vers, prog, progp->pg_name);

L
Linus Torvalds 已提交
1194
	serv->sv_stats->rpcbadfmt++;
A
Alexey Dobriyan 已提交
1195 1196 1197
	svc_putnl(resv, RPC_PROG_MISMATCH);
	svc_putnl(resv, progp->pg_lovers);
	svc_putnl(resv, progp->pg_hivers);
L
Linus Torvalds 已提交
1198 1199 1200
	goto sendit;

err_bad_proc:
1201
	svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1202

L
Linus Torvalds 已提交
1203
	serv->sv_stats->rpcbadfmt++;
A
Alexey Dobriyan 已提交
1204
	svc_putnl(resv, RPC_PROC_UNAVAIL);
L
Linus Torvalds 已提交
1205 1206 1207
	goto sendit;

err_garbage:
1208
	svc_printk(rqstp, "failed to decode args\n");
1209

L
Linus Torvalds 已提交
1210 1211 1212
	rpc_stat = rpc_garbage_args;
err_bad:
	serv->sv_stats->rpcbadfmt++;
A
Alexey Dobriyan 已提交
1213
	svc_putnl(resv, ntohl(rpc_stat));
L
Linus Torvalds 已提交
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	goto sendit;
}
1216
EXPORT_SYMBOL(svc_process);
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/*
 * Return (transport-specific) limit on the rpc payload.
 */
u32 svc_max_payload(const struct svc_rqst *rqstp)
{
1223
	u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1224

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	if (rqstp->rq_server->sv_max_payload < max)
		max = rqstp->rq_server->sv_max_payload;
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	return max;
}
EXPORT_SYMBOL_GPL(svc_max_payload);