client.c 36.8 KB
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/* client.c: NFS client sharing and management code
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


#include <linux/module.h>
#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/xprtrdma.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
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#include <linux/in6.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <net/ipv6.h>
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#include <linux/nfs_xdr.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include <linux/nsproxy.h>
#include <linux/pid_namespace.h>
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#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfs.h"
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#include "netns.h"
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#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
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static DEFINE_SPINLOCK(nfs_version_lock);
static DEFINE_MUTEX(nfs_version_mutex);
static LIST_HEAD(nfs_versions);
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/*
 * RPC cruft for NFS
 */
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static const struct rpc_version *nfs_version[5] = {
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	[2] = NULL,
	[3] = NULL,
	[4] = NULL,
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};

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const struct rpc_program nfs_program = {
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	.name			= "nfs",
	.number			= NFS_PROGRAM,
	.nrvers			= ARRAY_SIZE(nfs_version),
	.version		= nfs_version,
	.stats			= &nfs_rpcstat,
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	.pipe_dir_name		= NFS_PIPE_DIRNAME,
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};

struct rpc_stat nfs_rpcstat = {
	.program		= &nfs_program
};

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static struct nfs_subversion *find_nfs_version(unsigned int version)
{
	struct nfs_subversion *nfs;
	spin_lock(&nfs_version_lock);

	list_for_each_entry(nfs, &nfs_versions, list) {
		if (nfs->rpc_ops->version == version) {
			spin_unlock(&nfs_version_lock);
			return nfs;
		}
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	}
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	spin_unlock(&nfs_version_lock);
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	return ERR_PTR(-EPROTONOSUPPORT);
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}

struct nfs_subversion *get_nfs_version(unsigned int version)
{
	struct nfs_subversion *nfs = find_nfs_version(version);

	if (IS_ERR(nfs)) {
		mutex_lock(&nfs_version_mutex);
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		request_module("nfsv%d", version);
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		nfs = find_nfs_version(version);
		mutex_unlock(&nfs_version_mutex);
	}

	if (!IS_ERR(nfs))
		try_module_get(nfs->owner);
	return nfs;
}

void put_nfs_version(struct nfs_subversion *nfs)
{
	module_put(nfs->owner);
}

void register_nfs_version(struct nfs_subversion *nfs)
{
	spin_lock(&nfs_version_lock);

	list_add(&nfs->list, &nfs_versions);
	nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;

	spin_unlock(&nfs_version_lock);
}
EXPORT_SYMBOL_GPL(register_nfs_version);

void unregister_nfs_version(struct nfs_subversion *nfs)
{
	spin_lock(&nfs_version_lock);

	nfs_version[nfs->rpc_ops->version] = NULL;
	list_del(&nfs->list);

	spin_unlock(&nfs_version_lock);
}
EXPORT_SYMBOL_GPL(unregister_nfs_version);

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/*
 * Allocate a shared client record
 *
 * Since these are allocated/deallocated very rarely, we don't
 * bother putting them in a slab cache...
 */
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struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
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{
	struct nfs_client *clp;
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	struct rpc_cred *cred;
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	int err = -ENOMEM;
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	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
		goto error_0;

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	clp->cl_nfs_mod = cl_init->nfs_mod;
	try_module_get(clp->cl_nfs_mod->owner);

	clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
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	atomic_set(&clp->cl_count, 1);
	clp->cl_cons_state = NFS_CS_INITING;

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	memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
	clp->cl_addrlen = cl_init->addrlen;
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	if (cl_init->hostname) {
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		err = -ENOMEM;
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		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
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		if (!clp->cl_hostname)
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			goto error_cleanup;
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	}

	INIT_LIST_HEAD(&clp->cl_superblocks);
	clp->cl_rpcclient = ERR_PTR(-EINVAL);

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	clp->cl_proto = cl_init->proto;
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	clp->cl_net = get_net(cl_init->net);
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	cred = rpc_lookup_machine_cred("*");
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	if (!IS_ERR(cred))
		clp->cl_machine_cred = cred;
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	nfs_fscache_get_client_cookie(clp);

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	return clp;

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error_cleanup:
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	put_nfs_version(clp->cl_nfs_mod);
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	kfree(clp);
error_0:
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	return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(nfs_alloc_client);
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#if IS_ENABLED(CONFIG_NFS_V4)
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void nfs_cleanup_cb_ident_idr(struct net *net)
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{
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	struct nfs_net *nn = net_generic(net, nfs_net_id);

	idr_destroy(&nn->cb_ident_idr);
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}

/* nfs_client_lock held */
static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
{
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	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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	if (clp->cl_cb_ident)
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		idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
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}

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static void pnfs_init_server(struct nfs_server *server)
{
	rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
}

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#else
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void nfs_cleanup_cb_ident_idr(struct net *net)
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{
}

static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
{
}
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static void pnfs_init_server(struct nfs_server *server)
{
}

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#endif /* CONFIG_NFS_V4 */
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/*
 * Destroy a shared client record
 */
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void nfs_free_client(struct nfs_client *clp)
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{
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	dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
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	nfs_fscache_release_client_cookie(clp);

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	/* -EIO all pending I/O */
	if (!IS_ERR(clp->cl_rpcclient))
		rpc_shutdown_client(clp->cl_rpcclient);

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	if (clp->cl_machine_cred != NULL)
		put_rpccred(clp->cl_machine_cred);

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	put_net(clp->cl_net);
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	put_nfs_version(clp->cl_nfs_mod);
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	kfree(clp->cl_hostname);
	kfree(clp);

	dprintk("<-- nfs_free_client()\n");
}
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EXPORT_SYMBOL_GPL(nfs_free_client);
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/*
 * Release a reference to a shared client record
 */
void nfs_put_client(struct nfs_client *clp)
{
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	struct nfs_net *nn;

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	if (!clp)
		return;

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	dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
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	nn = net_generic(clp->cl_net, nfs_net_id);
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	if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
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		list_del(&clp->cl_share_link);
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		nfs_cb_idr_remove_locked(clp);
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		spin_unlock(&nn->nfs_client_lock);
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		WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
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		clp->rpc_ops->free_client(clp);
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	}
}
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EXPORT_SYMBOL_GPL(nfs_put_client);
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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/*
 * Test if two ip6 socket addresses refer to the same socket by
 * comparing relevant fields. The padding bytes specifically, are not
 * compared. sin6_flowinfo is not compared because it only affects QoS
 * and sin6_scope_id is only compared if the address is "link local"
 * because "link local" addresses need only be unique to a specific
 * link. Conversely, ordinary unicast addresses might have different
 * sin6_scope_id.
 *
 * The caller should ensure both socket addresses are AF_INET6.
 */
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static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
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{
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	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
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	if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
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		return 0;
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	else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
		return sin1->sin6_scope_id == sin2->sin6_scope_id;
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	return 1;
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}
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#else	/* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
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{
	return 0;
}
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#endif
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/*
 * Test if two ip4 socket addresses refer to the same socket, by
 * comparing relevant fields. The padding bytes specifically, are
 * not compared.
 *
 * The caller should ensure both socket addresses are AF_INET.
 */
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static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
				      const struct sockaddr *sa2)
{
	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;

	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}

static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
				const struct sockaddr *sa2)
{
	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;

	return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
		(sin1->sin6_port == sin2->sin6_port);
}

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static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
				const struct sockaddr *sa2)
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{
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	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
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	return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
		(sin1->sin_port == sin2->sin_port);
}

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#if defined(CONFIG_NFS_V4_1)
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/*
 * Test if two socket addresses represent the same actual socket,
 * by comparing (only) relevant fields, excluding the port number.
 */
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int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
			      const struct sockaddr *sa2)
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{
	if (sa1->sa_family != sa2->sa_family)
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		return 0;
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	switch (sa1->sa_family) {
	case AF_INET:
		return nfs_sockaddr_match_ipaddr4(sa1, sa2);
	case AF_INET6:
		return nfs_sockaddr_match_ipaddr6(sa1, sa2);
	}
	return 0;
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}
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EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr);
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#endif /* CONFIG_NFS_V4_1 */
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/*
 * Test if two socket addresses represent the same actual socket,
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 * by comparing (only) relevant fields, including the port number.
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 */
static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
			    const struct sockaddr *sa2)
{
	if (sa1->sa_family != sa2->sa_family)
		return 0;

	switch (sa1->sa_family) {
	case AF_INET:
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		return nfs_sockaddr_cmp_ip4(sa1, sa2);
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	case AF_INET6:
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		return nfs_sockaddr_cmp_ip6(sa1, sa2);
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	}
	return 0;
}

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/*
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 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
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 */
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static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
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{
	struct nfs_client *clp;
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	const struct sockaddr *sap = data->addr;
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	struct nfs_net *nn = net_generic(data->net, nfs_net_id);
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	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
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	        const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
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		/* Don't match clients that failed to initialise properly */
		if (clp->cl_cons_state < 0)
			continue;

		/* Different NFS versions cannot share the same nfs_client */
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		if (clp->rpc_ops != data->nfs_mod->rpc_ops)
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			continue;

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		if (clp->cl_proto != data->proto)
			continue;
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		/* Match nfsv4 minorversion */
		if (clp->cl_minorversion != data->minorversion)
			continue;
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		/* Match the full socket address */
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		if (!nfs_sockaddr_cmp(sap, clap))
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			continue;

		atomic_inc(&clp->cl_count);
		return clp;
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	}
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	return NULL;
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}

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static bool nfs_client_init_is_complete(const struct nfs_client *clp)
{
	return clp->cl_cons_state != NFS_CS_INITING;
}

int nfs_wait_client_init_complete(const struct nfs_client *clp)
{
	return wait_event_killable(nfs_client_active_wq,
			nfs_client_init_is_complete(clp));
}
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EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
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/*
 * Found an existing client.  Make sure it's ready before returning.
 */
static struct nfs_client *
nfs_found_client(const struct nfs_client_initdata *cl_init,
		 struct nfs_client *clp)
{
	int error;

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	error = nfs_wait_client_init_complete(clp);
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	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(-ERESTARTSYS);
	}

	if (clp->cl_cons_state < NFS_CS_READY) {
		error = clp->cl_cons_state;
		nfs_put_client(clp);
		return ERR_PTR(error);
	}

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	smp_rmb();

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	dprintk("<-- %s found nfs_client %p for %s\n",
		__func__, clp, cl_init->hostname ?: "");
	return clp;
}

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/*
 * Look up a client by IP address and protocol version
 * - creates a new record if one doesn't yet exist
 */
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struct nfs_client *
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nfs_get_client(const struct nfs_client_initdata *cl_init,
	       const struct rpc_timeout *timeparms,
	       const char *ip_addr,
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	       rpc_authflavor_t authflavour)
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{
	struct nfs_client *clp, *new = NULL;
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	struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
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	const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
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	dprintk("--> nfs_get_client(%s,v%u)\n",
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		cl_init->hostname ?: "", rpc_ops->version);
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	/* see if the client already exists */
	do {
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		spin_lock(&nn->nfs_client_lock);
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		clp = nfs_match_client(cl_init);
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		if (clp) {
			spin_unlock(&nn->nfs_client_lock);
			if (new)
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				new->rpc_ops->free_client(new);
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			return nfs_found_client(cl_init, clp);
		}
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		if (new) {
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			list_add_tail(&new->cl_share_link,
					&nn->nfs_client_list);
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			spin_unlock(&nn->nfs_client_lock);
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			new->cl_flags = cl_init->init_flags;
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			return rpc_ops->init_client(new, timeparms, ip_addr);
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		}
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		spin_unlock(&nn->nfs_client_lock);
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		new = rpc_ops->alloc_client(cl_init);
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	} while (!IS_ERR(new));
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	dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
		cl_init->hostname ?: "", PTR_ERR(new));
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	return new;
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}
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EXPORT_SYMBOL_GPL(nfs_get_client);
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/*
 * Mark a server as ready or failed
 */
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void nfs_mark_client_ready(struct nfs_client *clp, int state)
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{
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	smp_wmb();
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	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
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EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
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/*
 * Initialise the timeout values for a connection
 */
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void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
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				    unsigned int timeo, unsigned int retrans)
{
	to->to_initval = timeo * HZ / 10;
	to->to_retries = retrans;

	switch (proto) {
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	case XPRT_TRANSPORT_TCP:
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	case XPRT_TRANSPORT_RDMA:
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		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
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		if (to->to_initval == 0)
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			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
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		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
			to->to_initval = NFS_MAX_TCP_TIMEOUT;
		to->to_increment = to->to_initval;
		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
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		if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
			to->to_maxval = NFS_MAX_TCP_TIMEOUT;
		if (to->to_maxval < to->to_initval)
			to->to_maxval = to->to_initval;
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		to->to_exponential = 0;
		break;
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	case XPRT_TRANSPORT_UDP:
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		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
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		if (!to->to_initval)
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			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
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		if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
			to->to_initval = NFS_MAX_UDP_TIMEOUT;
		to->to_maxval = NFS_MAX_UDP_TIMEOUT;
		to->to_exponential = 1;
		break;
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	default:
		BUG();
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	}
}
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EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
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/*
 * Create an RPC client handle
 */
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int nfs_create_rpc_client(struct nfs_client *clp,
			  const struct rpc_timeout *timeparms,
			  rpc_authflavor_t flavor)
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{
	struct rpc_clnt		*clnt = NULL;
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	struct rpc_create_args args = {
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		.net		= clp->cl_net,
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		.protocol	= clp->cl_proto,
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		.address	= (struct sockaddr *)&clp->cl_addr,
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		.addrsize	= clp->cl_addrlen,
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		.timeout	= timeparms,
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		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
590

C
Chuck Lever 已提交
591
	if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
592
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
593 594
	if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
		args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
C
Chuck Lever 已提交
595
	if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
596
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
597 598
	if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
		args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
599

600 601 602
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

603
	clnt = rpc_create(&args);
604 605
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
606
				__func__, PTR_ERR(clnt));
607 608 609 610 611 612
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
B
Bryan Schumaker 已提交
613
EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
614 615 616 617 618 619

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
620
	if (server->nlm_host)
621
		nlmclnt_done(server->nlm_host);
622 623 624 625 626 627 628
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
629 630
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
631 632 633 634 635
	struct nlmclnt_initdata nlm_init = {
		.hostname	= clp->cl_hostname,
		.address	= (struct sockaddr *)&clp->cl_addr,
		.addrlen	= clp->cl_addrlen,
		.nfs_version	= clp->rpc_ops->version,
636 637
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
638
		.net		= clp->cl_net,
639
	};
640

641
	if (nlm_init.nfs_version > 3)
642
		return 0;
643 644
	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
645 646
		return 0;

647 648 649 650 651 652 653 654
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

655
	host = nlmclnt_init(&nlm_init);
656 657 658 659 660 661
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
662 663 664 665 666
}

/*
 * Create a general RPC client
 */
667
int nfs_init_server_rpcclient(struct nfs_server *server,
668 669
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
670 671 672
{
	struct nfs_client *clp = server->nfs_client;

673 674
	server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
							pseudoflavour);
675
	if (IS_ERR(server->client)) {
676
		dprintk("%s: couldn't create rpc_client!\n", __func__);
677 678 679
		return PTR_ERR(server->client);
	}

680 681 682 683
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;
684 685 686 687 688 689
	server->client->cl_softrtry = 0;
	if (server->flags & NFS_MOUNT_SOFT)
		server->client->cl_softrtry = 1;

	return 0;
}
B
Bryan Schumaker 已提交
690
EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
691

692 693 694 695 696 697 698 699
/**
 * nfs_init_client - Initialise an NFS2 or NFS3 client
 *
 * @clp: nfs_client to initialise
 * @timeparms: timeout parameters for underlying RPC transport
 * @ip_addr: IP presentation address (not used)
 *
 * Returns pointer to an NFS client, or an ERR_PTR value.
700
 */
701 702
struct nfs_client *nfs_init_client(struct nfs_client *clp,
		    const struct rpc_timeout *timeparms,
703
		    const char *ip_addr)
704 705 706 707 708 709
{
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is already initialised */
		dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
710
		return clp;
711 712 713 714 715 716
	}

	/*
	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
	 * - RFC 2623, sec 2.3.2
	 */
C
Chuck Lever 已提交
717
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
718 719 720
	if (error < 0)
		goto error;
	nfs_mark_client_ready(clp, NFS_CS_READY);
721
	return clp;
722 723 724

error:
	nfs_mark_client_ready(clp, error);
725
	nfs_put_client(clp);
726
	dprintk("<-- nfs_init_client() = xerror %d\n", error);
727
	return ERR_PTR(error);
728
}
B
Bryan Schumaker 已提交
729
EXPORT_SYMBOL_GPL(nfs_init_client);
730 731 732 733

/*
 * Create a version 2 or 3 client
 */
734
static int nfs_init_server(struct nfs_server *server,
735 736
			   const struct nfs_parsed_mount_data *data,
			   struct nfs_subversion *nfs_mod)
737
{
738 739
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
740
		.addr = (const struct sockaddr *)&data->nfs_server.address,
741
		.addrlen = data->nfs_server.addrlen,
742
		.nfs_mod = nfs_mod,
743
		.proto = data->nfs_server.protocol,
744
		.net = data->net,
745
	};
746
	struct rpc_timeout timeparms;
747
	struct nfs_client *clp;
748
	int error;
749 750 751

	dprintk("--> nfs_init_server()\n");

752 753
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
C
Chuck Lever 已提交
754 755
	if (data->flags & NFS_MOUNT_NORESVPORT)
		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
756

757
	/* Allocate or find a client reference we can use */
C
Chuck Lever 已提交
758
	clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
759 760 761 762 763 764 765 766
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
767
	server->flags = data->flags;
768
	server->options = data->options;
769 770
	server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
		NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
771
		NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787

	if (data->rsize)
		server->rsize = nfs_block_size(data->rsize, NULL);
	if (data->wsize)
		server->wsize = nfs_block_size(data->wsize, NULL);

	server->acregmin = data->acregmin * HZ;
	server->acregmax = data->acregmax * HZ;
	server->acdirmin = data->acdirmin * HZ;
	server->acdirmax = data->acdirmax * HZ;

	/* Start lockd here, before we might error out */
	error = nfs_start_lockd(server);
	if (error < 0)
		goto error;

788 789
	server->port = data->nfs_server.port;

790
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
791 792 793
	if (error < 0)
		goto error;

794 795 796 797 798 799 800 801 802 803
	/* Preserve the values of mount_server-related mount options */
	if (data->mount_server.addrlen) {
		memcpy(&server->mountd_address, &data->mount_server.address,
			data->mount_server.addrlen);
		server->mountd_addrlen = data->mount_server.addrlen;
	}
	server->mountd_version = data->mount_server.version;
	server->mountd_port = data->mount_server.port;
	server->mountd_protocol = data->mount_server.protocol;

804 805 806 807 808 809 810 811 812 813 814 815 816 817
	server->namelen  = data->namlen;
	dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
	return 0;

error:
	server->nfs_client = NULL;
	nfs_put_client(clp);
	dprintk("<-- nfs_init_server() = xerror %d\n", error);
	return error;
}

/*
 * Load up the server record from information gained in an fsinfo record
 */
818 819 820
static void nfs_server_set_fsinfo(struct nfs_server *server,
				  struct nfs_fh *mntfh,
				  struct nfs_fsinfo *fsinfo)
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
{
	unsigned long max_rpc_payload;

	/* Work out a lot of parameters */
	if (server->rsize == 0)
		server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
	if (server->wsize == 0)
		server->wsize = nfs_block_size(fsinfo->wtpref, NULL);

	if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
		server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
	if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
		server->wsize = nfs_block_size(fsinfo->wtmax, NULL);

	max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
	if (server->rsize > max_rpc_payload)
		server->rsize = max_rpc_payload;
	if (server->rsize > NFS_MAX_FILE_IO_SIZE)
		server->rsize = NFS_MAX_FILE_IO_SIZE;
	server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
P
Peter Zijlstra 已提交
841

842
	server->backing_dev_info.name = "nfs";
843 844 845 846 847 848 849
	server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;

	if (server->wsize > max_rpc_payload)
		server->wsize = max_rpc_payload;
	if (server->wsize > NFS_MAX_FILE_IO_SIZE)
		server->wsize = NFS_MAX_FILE_IO_SIZE;
	server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
R
Ricardo Labiaga 已提交
850

851 852 853
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
854 855
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
856 857 858 859 860 861 862 863 864 865
	if (server->dtsize > server->rsize)
		server->dtsize = server->rsize;

	if (server->flags & NFS_MOUNT_NOAC) {
		server->acregmin = server->acregmax = 0;
		server->acdirmin = server->acdirmax = 0;
	}

	server->maxfilesize = fsinfo->maxfilesize;

R
Ricardo Labiaga 已提交
866 867
	server->time_delta = fsinfo->time_delta;

868 869 870 871 872 873 874
	/* We're airborne Set socket buffersize */
	rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
}

/*
 * Probe filesystem information, including the FSID on v2/v3
 */
875
int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
876 877 878 879 880 881 882 883 884 885 886 887 888 889
{
	struct nfs_fsinfo fsinfo;
	struct nfs_client *clp = server->nfs_client;
	int error;

	dprintk("--> nfs_probe_fsinfo()\n");

	if (clp->rpc_ops->set_capabilities != NULL) {
		error = clp->rpc_ops->set_capabilities(server, mntfh);
		if (error < 0)
			goto out_error;
	}

	fsinfo.fattr = fattr;
R
Ricardo Labiaga 已提交
890
	fsinfo.layouttype = 0;
891 892 893 894
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

895
	nfs_server_set_fsinfo(server, mntfh, &fsinfo);
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914

	/* Get some general file system info */
	if (server->namelen == 0) {
		struct nfs_pathconf pathinfo;

		pathinfo.fattr = fattr;
		nfs_fattr_init(fattr);

		if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
			server->namelen = pathinfo.max_namelen;
	}

	dprintk("<-- nfs_probe_fsinfo() = 0\n");
	return 0;

out_error:
	dprintk("nfs_probe_fsinfo: error = %d\n", -error);
	return error;
}
B
Bryan Schumaker 已提交
915
EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
916 917 918 919

/*
 * Copy useful information when duplicating a server record
 */
920
void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
921 922
{
	target->flags = source->flags;
923 924
	target->rsize = source->rsize;
	target->wsize = source->wsize;
925 926 927 928 929
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
930
	target->options = source->options;
931
}
B
Bryan Schumaker 已提交
932
EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
933

934
void nfs_server_insert_lists(struct nfs_server *server)
935 936
{
	struct nfs_client *clp = server->nfs_client;
937
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
938

939
	spin_lock(&nn->nfs_client_lock);
940
	list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
941
	list_add_tail(&server->master_link, &nn->nfs_volume_list);
942
	clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
943
	spin_unlock(&nn->nfs_client_lock);
944 945

}
B
Bryan Schumaker 已提交
946
EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
947

C
Chuck Lever 已提交
948
void nfs_server_remove_lists(struct nfs_server *server)
949
{
950
	struct nfs_client *clp = server->nfs_client;
951
	struct nfs_net *nn;
952

953 954
	if (clp == NULL)
		return;
955
	nn = net_generic(clp->cl_net, nfs_net_id);
956
	spin_lock(&nn->nfs_client_lock);
957
	list_del_rcu(&server->client_link);
958
	if (list_empty(&clp->cl_superblocks))
959
		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
960
	list_del(&server->master_link);
961
	spin_unlock(&nn->nfs_client_lock);
962 963 964

	synchronize_rcu();
}
C
Chuck Lever 已提交
965
EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
966

967 968 969
/*
 * Allocate and initialise a server record
 */
970
struct nfs_server *nfs_alloc_server(void)
971 972 973 974 975 976 977 978 979 980 981 982
{
	struct nfs_server *server;

	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
	if (!server)
		return NULL;

	server->client = server->client_acl = ERR_PTR(-EINVAL);

	/* Zero out the NFS state stuff */
	INIT_LIST_HEAD(&server->client_link);
	INIT_LIST_HEAD(&server->master_link);
983
	INIT_LIST_HEAD(&server->delegations);
984
	INIT_LIST_HEAD(&server->layouts);
985
	INIT_LIST_HEAD(&server->state_owners_lru);
986

987 988
	atomic_set(&server->active, 0);

989 990 991 992 993 994
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

995 996 997 998 999 1000
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

1001
	ida_init(&server->openowner_id);
1002
	ida_init(&server->lockowner_id);
F
Fred Isaman 已提交
1003 1004
	pnfs_init_server(server);

1005 1006
	return server;
}
B
Bryan Schumaker 已提交
1007
EXPORT_SYMBOL_GPL(nfs_alloc_server);
1008 1009 1010 1011 1012 1013 1014 1015

/*
 * Free up a server record
 */
void nfs_free_server(struct nfs_server *server)
{
	dprintk("--> nfs_free_server()\n");

1016
	nfs_server_remove_lists(server);
1017 1018 1019

	if (server->destroy != NULL)
		server->destroy(server);
1020 1021 1022

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1023 1024 1025 1026 1027
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

1028
	ida_destroy(&server->lockowner_id);
1029
	ida_destroy(&server->openowner_id);
1030
	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
1031
	bdi_destroy(&server->backing_dev_info);
1032 1033 1034 1035
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}
B
Bryan Schumaker 已提交
1036
EXPORT_SYMBOL_GPL(nfs_free_server);
1037 1038 1039 1040 1041

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1042
struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1043
				     struct nfs_subversion *nfs_mod)
1044 1045
{
	struct nfs_server *server;
1046
	struct nfs_fattr *fattr;
1047 1048 1049 1050 1051 1052
	int error;

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

1053 1054 1055 1056 1057
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1058
	/* Get a client representation */
1059
	error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1060 1061 1062 1063
	if (error < 0)
		goto error;

	/* Probe the root fh to retrieve its FSID */
1064
	error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1065 1066
	if (error < 0)
		goto error;
1067 1068 1069
	if (server->nfs_client->rpc_ops->version == 3) {
		if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
			server->namelen = NFS3_MAXNAMLEN;
1070
		if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1071 1072 1073 1074 1075 1076
			server->caps |= NFS_CAP_READDIRPLUS;
	} else {
		if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
			server->namelen = NFS2_MAXNAMLEN;
	}

1077
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
1078
		error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
1079 1080 1081 1082 1083
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1084
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1085

1086 1087 1088
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1089

1090
	nfs_server_insert_lists(server);
1091
	server->mount_time = jiffies;
1092
	nfs_free_fattr(fattr);
1093 1094 1095
	return server;

error:
1096
	nfs_free_fattr(fattr);
1097 1098 1099
	nfs_free_server(server);
	return ERR_PTR(error);
}
B
Bryan Schumaker 已提交
1100
EXPORT_SYMBOL_GPL(nfs_create_server);
1101 1102 1103 1104 1105 1106

/*
 * Clone an NFS2, NFS3 or NFS4 server record
 */
struct nfs_server *nfs_clone_server(struct nfs_server *source,
				    struct nfs_fh *fh,
1107 1108
				    struct nfs_fattr *fattr,
				    rpc_authflavor_t flavor)
1109 1110
{
	struct nfs_server *server;
1111
	struct nfs_fattr *fattr_fsinfo;
1112 1113 1114
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1115 1116
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1117 1118 1119 1120 1121

	server = nfs_alloc_server();
	if (!server)
		return ERR_PTR(-ENOMEM);

1122 1123 1124 1125 1126
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1127 1128
	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
1129
	server->destroy = source->destroy;
1130 1131 1132 1133 1134
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1135 1136
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
1137
			flavor);
1138 1139 1140 1141
	if (error < 0)
		goto out_free_server;

	/* probe the filesystem info for this server filesystem */
1142
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1143 1144 1145
	if (error < 0)
		goto out_free_server;

1146 1147 1148
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1149
	dprintk("Cloned FSID: %llx:%llx\n",
1150 1151
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1152 1153 1154 1155 1156

	error = nfs_start_lockd(server);
	if (error < 0)
		goto out_free_server;

1157
	nfs_server_insert_lists(server);
1158 1159
	server->mount_time = jiffies;

1160
	nfs_free_fattr(fattr_fsinfo);
1161 1162 1163 1164
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1165
	nfs_free_fattr(fattr_fsinfo);
1166 1167 1168 1169
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
B
Bryan Schumaker 已提交
1170
EXPORT_SYMBOL_GPL(nfs_clone_server);
1171

1172 1173 1174 1175 1176
void nfs_clients_init(struct net *net)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	INIT_LIST_HEAD(&nn->nfs_client_list);
1177
	INIT_LIST_HEAD(&nn->nfs_volume_list);
B
Bryan Schumaker 已提交
1178
#if IS_ENABLED(CONFIG_NFS_V4)
1179 1180
	idr_init(&nn->cb_ident_idr);
#endif
1181
	spin_lock_init(&nn->nfs_client_lock);
1182
	nn->boot_time = CURRENT_TIME;
1183 1184
}

1185 1186 1187 1188 1189 1190 1191 1192 1193
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_fs_nfs;

static int nfs_server_list_open(struct inode *inode, struct file *file);
static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
static void nfs_server_list_stop(struct seq_file *p, void *v);
static int nfs_server_list_show(struct seq_file *m, void *v);

J
James Morris 已提交
1194
static const struct seq_operations nfs_server_list_ops = {
1195 1196 1197 1198 1199 1200
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1201
static const struct file_operations nfs_server_list_fops = {
1202 1203 1204 1205
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1206
	.owner		= THIS_MODULE,
1207 1208 1209 1210 1211 1212 1213 1214
};

static int nfs_volume_list_open(struct inode *inode, struct file *file);
static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
static void nfs_volume_list_stop(struct seq_file *p, void *v);
static int nfs_volume_list_show(struct seq_file *m, void *v);

J
James Morris 已提交
1215
static const struct seq_operations nfs_volume_list_ops = {
1216 1217 1218 1219 1220 1221
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1222
static const struct file_operations nfs_volume_list_fops = {
1223 1224 1225 1226
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1227
	.owner		= THIS_MODULE,
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
};

/*
 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
 * we're dealing
 */
static int nfs_server_list_open(struct inode *inode, struct file *file)
{
	struct seq_file *m;
	int ret;
1238 1239
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1240 1241 1242 1243 1244 1245

	ret = seq_open(file, &nfs_server_list_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
1246
	m->private = net;
1247 1248 1249 1250 1251 1252 1253 1254 1255

	return 0;
}

/*
 * set up the iterator to start reading from the server list and return the first item
 */
static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
{
1256 1257
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1258
	/* lock the list against modification */
1259
	spin_lock(&nn->nfs_client_lock);
1260
	return seq_list_start_head(&nn->nfs_client_list, *_pos);
1261 1262 1263 1264 1265 1266 1267
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1268 1269 1270
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_client_list, pos);
1271 1272 1273 1274 1275 1276 1277
}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
1278 1279 1280
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
1281 1282 1283 1284 1285 1286 1287 1288
}

/*
 * display a header line followed by a load of call lines
 */
static int nfs_server_list_show(struct seq_file *m, void *v)
{
	struct nfs_client *clp;
1289
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1290 1291

	/* display header on line 1 */
1292
	if (v == &nn->nfs_client_list) {
1293 1294 1295 1296 1297 1298 1299
		seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
		return 0;
	}

	/* display one transport per line on subsequent lines */
	clp = list_entry(v, struct nfs_client, cl_share_link);

1300 1301 1302 1303
	/* Check if the client is initialized */
	if (clp->cl_cons_state != NFS_CS_READY)
		return 0;

1304
	rcu_read_lock();
1305
	seq_printf(m, "v%u %s %s %3d %s\n",
1306
		   clp->rpc_ops->version,
1307 1308
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1309 1310
		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);
1311
	rcu_read_unlock();
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322

	return 0;
}

/*
 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
 */
static int nfs_volume_list_open(struct inode *inode, struct file *file)
{
	struct seq_file *m;
	int ret;
1323 1324
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1325 1326 1327 1328 1329 1330

	ret = seq_open(file, &nfs_volume_list_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
1331
	m->private = net;
1332 1333 1334 1335 1336 1337 1338 1339 1340

	return 0;
}

/*
 * set up the iterator to start reading from the volume list and return the first item
 */
static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
{
1341 1342
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1343
	/* lock the list against modification */
1344
	spin_lock(&nn->nfs_client_lock);
1345
	return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1346 1347 1348 1349 1350 1351 1352
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1353 1354 1355
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_volume_list, pos);
1356 1357 1358 1359 1360 1361 1362
}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
1363 1364 1365
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
}

/*
 * display a header line followed by a load of call lines
 */
static int nfs_volume_list_show(struct seq_file *m, void *v)
{
	struct nfs_server *server;
	struct nfs_client *clp;
	char dev[8], fsid[17];
1376
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1377 1378

	/* display header on line 1 */
1379
	if (v == &nn->nfs_volume_list) {
D
David Howells 已提交
1380
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
		return 0;
	}
	/* display one transport per line on subsequent lines */
	server = list_entry(v, struct nfs_server, master_link);
	clp = server->nfs_client;

	snprintf(dev, 8, "%u:%u",
		 MAJOR(server->s_dev), MINOR(server->s_dev));

	snprintf(fsid, 17, "%llx:%llx",
1391 1392
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1393

1394
	rcu_read_lock();
D
David Howells 已提交
1395
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1396
		   clp->rpc_ops->version,
1397 1398
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1399
		   dev,
D
David Howells 已提交
1400 1401
		   fsid,
		   nfs_server_fscache_state(server));
1402
	rcu_read_unlock();
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413

	return 0;
}

/*
 * initialise the /proc/fs/nfsfs/ directory
 */
int __init nfs_fs_proc_init(void)
{
	struct proc_dir_entry *p;

A
Alexey Dobriyan 已提交
1414
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1415 1416 1417 1418
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1419 1420
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1421 1422 1423 1424
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1425 1426
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1427 1428 1429 1430 1431 1432 1433
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1434
	remove_proc_entry("fs/nfsfs", NULL);
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
error_0:
	return -ENOMEM;
}

/*
 * clean up the /proc/fs/nfsfs/ directory
 */
void nfs_fs_proc_exit(void)
{
	remove_proc_entry("volumes", proc_fs_nfs);
	remove_proc_entry("servers", proc_fs_nfs);
A
Alexey Dobriyan 已提交
1446
	remove_proc_entry("fs/nfsfs", NULL);
1447 1448 1449
}

#endif /* CONFIG_PROC_FS */