client.c 53.1 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 "netns.h"
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#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
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#ifdef CONFIG_NFS_V4

/*
 * Get a unique NFSv4.0 callback identifier which will be used
 * by the V4.0 callback service to lookup the nfs_client struct
 */
static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
{
	int ret = 0;
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	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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	if (clp->rpc_ops->version != 4 || minorversion != 0)
		return ret;
retry:
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	if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
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		return -ENOMEM;
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	spin_lock(&nn->nfs_client_lock);
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	ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
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	spin_unlock(&nn->nfs_client_lock);
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	if (ret == -EAGAIN)
		goto retry;
	return ret;
}
#endif /* CONFIG_NFS_V4 */
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/*
 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS
 */
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static bool nfs4_disable_idmapping = true;
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/*
 * RPC cruft for NFS
 */
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static const struct rpc_version *nfs_version[5] = {
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#ifdef CONFIG_NFS_V2
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	[2]			= &nfs_version2,
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#endif
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#ifdef CONFIG_NFS_V3
	[3]			= &nfs_version3,
#endif
#ifdef CONFIG_NFS_V4
	[4]			= &nfs_version4,
#endif
};

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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
};


#ifdef CONFIG_NFS_V3_ACL
static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
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static const struct rpc_version *nfsacl_version[] = {
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	[3]			= &nfsacl_version3,
};

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const struct rpc_program nfsacl_program = {
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	.name			= "nfsacl",
	.number			= NFS_ACL_PROGRAM,
	.nrvers			= ARRAY_SIZE(nfsacl_version),
	.version		= nfsacl_version,
	.stats			= &nfsacl_rpcstat,
};
#endif  /* CONFIG_NFS_V3_ACL */

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struct nfs_client_initdata {
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	unsigned long init_flags;
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	const char *hostname;
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	const struct sockaddr *addr;
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	size_t addrlen;
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	const struct nfs_rpc_ops *rpc_ops;
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	int proto;
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	u32 minorversion;
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	struct net *net;
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};

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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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static 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->rpc_ops = cl_init->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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#ifdef CONFIG_NFS_V4
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	err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
	if (err)
		goto error_cleanup;

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	spin_lock_init(&clp->cl_lock);
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	INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
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	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
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	clp->cl_minorversion = cl_init->minorversion;
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	clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
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#endif
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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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	kfree(clp);
error_0:
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	return ERR_PTR(err);
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}

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#ifdef CONFIG_NFS_V4
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#ifdef CONFIG_NFS_V4_1
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static void nfs4_shutdown_session(struct nfs_client *clp)
{
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	if (nfs4_has_session(clp)) {
		nfs4_deviceid_purge_client(clp);
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		nfs4_destroy_session(clp->cl_session);
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	}

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}
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#else /* CONFIG_NFS_V4_1 */
static void nfs4_shutdown_session(struct nfs_client *clp)
{
}
#endif /* CONFIG_NFS_V4_1 */
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/*
 * Destroy the NFS4 callback service
 */
static void nfs4_destroy_callback(struct nfs_client *clp)
{
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
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		nfs_callback_down(clp->cl_mvops->minor_version);
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}

static void nfs4_shutdown_client(struct nfs_client *clp)
{
	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
		nfs4_kill_renewd(clp);
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	nfs4_shutdown_session(clp);
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	nfs4_destroy_callback(clp);
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	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
		nfs_idmap_delete(clp);

	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
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	kfree(clp->cl_serverscope);
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	kfree(clp->cl_implid);
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}
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/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
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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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static void nfs4_destroy_server(struct nfs_server *server)
{
	nfs4_purge_state_owners(server);
}

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#else
static void nfs4_shutdown_client(struct nfs_client *clp)
{
}
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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
 */
static void nfs_free_client(struct nfs_client *clp)
{
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	dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
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	nfs4_shutdown_client(clp);
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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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	kfree(clp->cl_hostname);
	kfree(clp);

	dprintk("<-- nfs_free_client()\n");
}

/*
 * 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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		BUG_ON(!list_empty(&clp->cl_superblocks));

		nfs_free_client(clp);
	}
}
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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.
 */
static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
				     const struct sockaddr *sa2)
{
	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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#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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#if defined(CONFIG_NFS_V4_1)
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/* Common match routine for v4.0 and v4.1 callback services */
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static bool nfs4_cb_match_client(const struct sockaddr *addr,
		struct nfs_client *clp, u32 minorversion)
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{
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	struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
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	/* Don't match clients that failed to initialise */
	if (!(clp->cl_cons_state == NFS_CS_READY ||
	    clp->cl_cons_state == NFS_CS_SESSION_INITING))
		return false;
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	/* Match the version and minorversion */
	if (clp->rpc_ops->version != 4 ||
	    clp->cl_minorversion != minorversion)
		return false;
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	/* Match only the IP address, not the port number */
	if (!nfs_sockaddr_match_ipaddr(addr, clap))
		return false;
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	return true;
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}
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#endif /* CONFIG_NFS_V4_1 */
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/*
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 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
477
 */
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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->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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/*
 * 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;

	error = wait_event_killable(nfs_client_active_wq,
				clp->cl_cons_state < NFS_CS_INITING);
	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);
	}

	BUG_ON(clp->cl_cons_state != NFS_CS_READY);

	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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static struct nfs_client *
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;
549
	struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
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	dprintk("--> nfs_get_client(%s,v%u)\n",
		cl_init->hostname ?: "", cl_init->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)
				nfs_free_client(new);
			return nfs_found_client(cl_init, clp);
		}
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		if (new) {
			list_add(&new->cl_share_link, &nn->nfs_client_list);
			spin_unlock(&nn->nfs_client_lock);
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			new->cl_flags = cl_init->init_flags;
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			return cl_init->rpc_ops->init_client(new,
						timeparms, ip_addr,
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						authflavour);
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		}
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		spin_unlock(&nn->nfs_client_lock);
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576
		new = nfs_alloc_client(cl_init);
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	} while (!IS_ERR(new));
578

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	dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
		cl_init->hostname ?: "", PTR_ERR(new));
581
	return new;
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}

/*
 * Mark a server as ready or failed
 */
587
void nfs_mark_client_ready(struct nfs_client *clp, int state)
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{
	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
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/*
 * With sessions, the client is not marked ready until after a
 * successful EXCHANGE_ID and CREATE_SESSION.
 *
 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
 * other versions of NFS can be tried.
 */
int nfs4_check_client_ready(struct nfs_client *clp)
{
	if (!nfs4_has_session(clp))
		return 0;
	if (clp->cl_cons_state < NFS_CS_READY)
		return -EPROTONOSUPPORT;
	return 0;
}

609 610 611 612 613 614 615 616 617 618
/*
 * Initialise the timeout values for a connection
 */
static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
				    unsigned int timeo, unsigned int retrans)
{
	to->to_initval = timeo * HZ / 10;
	to->to_retries = retrans;

	switch (proto) {
619
	case XPRT_TRANSPORT_TCP:
\
\"Talpey, Thomas\ 已提交
620
	case XPRT_TRANSPORT_RDMA:
621 622
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
623
		if (to->to_initval == 0)
624
			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
625 626 627 628
		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);
629 630 631 632
		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;
633 634
		to->to_exponential = 0;
		break;
635
	case XPRT_TRANSPORT_UDP:
636 637
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
638
		if (!to->to_initval)
639
			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
640 641 642 643 644
		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;
645 646
	default:
		BUG();
647 648 649 650 651 652
	}
}

/*
 * Create an RPC client handle
 */
653
static int nfs_create_rpc_client(struct nfs_client *clp,
654
				 const struct rpc_timeout *timeparms,
C
Chuck Lever 已提交
655
				 rpc_authflavor_t flavor)
656 657
{
	struct rpc_clnt		*clnt = NULL;
658
	struct rpc_create_args args = {
659
		.net		= clp->cl_net,
660
		.protocol	= clp->cl_proto,
661
		.address	= (struct sockaddr *)&clp->cl_addr,
662
		.addrsize	= clp->cl_addrlen,
663
		.timeout	= timeparms,
664 665 666 667 668
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
669

C
Chuck Lever 已提交
670
	if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
671
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
C
Chuck Lever 已提交
672
	if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
673 674
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

675 676 677
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

678
	clnt = rpc_create(&args);
679 680
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
681
				__func__, PTR_ERR(clnt));
682 683 684 685 686 687
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
688 689 690 691 692 693

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
694 695
	if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
			!(server->flags & NFS_MOUNT_LOCAL_FCNTL))
696
		nlmclnt_done(server->nlm_host);
697 698 699 700 701 702 703
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
704 705
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
706 707 708 709 710
	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,
711 712
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
713
		.net		= clp->cl_net,
714
	};
715

716
	if (nlm_init.nfs_version > 3)
717
		return 0;
718 719
	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
720 721
		return 0;

722 723 724 725 726 727 728 729
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

730
	host = nlmclnt_init(&nlm_init);
731 732 733 734 735 736
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
737 738 739 740 741 742 743 744
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
745
	if (server->nfs_client->rpc_ops->version != 3)
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
		goto out_noacl;
	if (server->flags & NFS_MOUNT_NOACL)
		goto out_noacl;

	server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
	if (IS_ERR(server->client_acl))
		goto out_noacl;

	/* No errors! Assume that Sun nfsacls are supported */
	server->caps |= NFS_CAP_ACLS;
	return;

out_noacl:
	server->caps &= ~NFS_CAP_ACLS;
}
#else
static inline void nfs_init_server_aclclient(struct nfs_server *server)
{
	server->flags &= ~NFS_MOUNT_NOACL;
	server->caps &= ~NFS_CAP_ACLS;
}
#endif

/*
 * Create a general RPC client
 */
772 773 774
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
775 776 777 778 779
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
780
		dprintk("%s: couldn't create rpc_client!\n", __func__);
781 782 783
		return PTR_ERR(server->client);
	}

784 785 786 787 788
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

789 790 791 792 793
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
794
			dprintk("%s: couldn't create credcache!\n", __func__);
795 796 797 798 799 800 801 802 803 804
			return PTR_ERR(auth);
		}
	}
	server->client->cl_softrtry = 0;
	if (server->flags & NFS_MOUNT_SOFT)
		server->client->cl_softrtry = 1;

	return 0;
}

805 806 807 808 809 810 811 812 813
/**
 * 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)
 * @authflavor: authentication flavor for underlying RPC transport
 *
 * Returns pointer to an NFS client, or an ERR_PTR value.
814
 */
815 816
struct nfs_client *nfs_init_client(struct nfs_client *clp,
		    const struct rpc_timeout *timeparms,
C
Chuck Lever 已提交
817
		    const char *ip_addr, rpc_authflavor_t authflavour)
818 819 820 821 822 823
{
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is already initialised */
		dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
824
		return clp;
825 826 827 828 829 830
	}

	/*
	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
	 * - RFC 2623, sec 2.3.2
	 */
C
Chuck Lever 已提交
831
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
832 833 834
	if (error < 0)
		goto error;
	nfs_mark_client_ready(clp, NFS_CS_READY);
835
	return clp;
836 837 838

error:
	nfs_mark_client_ready(clp, error);
839
	nfs_put_client(clp);
840
	dprintk("<-- nfs_init_client() = xerror %d\n", error);
841
	return ERR_PTR(error);
842 843 844 845 846
}

/*
 * Create a version 2 or 3 client
 */
847 848
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
849
{
850 851
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
852
		.addr = (const struct sockaddr *)&data->nfs_server.address,
853
		.addrlen = data->nfs_server.addrlen,
B
Bryan Schumaker 已提交
854
		.rpc_ops = NULL,
855
		.proto = data->nfs_server.protocol,
856
		.net = data->net,
857
	};
858
	struct rpc_timeout timeparms;
859
	struct nfs_client *clp;
860
	int error;
861 862 863

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

B
Bryan Schumaker 已提交
864 865 866 867 868 869
	switch (data->version) {
#ifdef CONFIG_NFS_V2
	case 2:
		cl_init.rpc_ops = &nfs_v2_clientops;
		break;
#endif
870
#ifdef CONFIG_NFS_V3
B
Bryan Schumaker 已提交
871
	case 3:
872
		cl_init.rpc_ops = &nfs_v3_clientops;
B
Bryan Schumaker 已提交
873
		break;
874
#endif
B
Bryan Schumaker 已提交
875 876 877
	default:
		return -EPROTONOSUPPORT;
	}
878

879 880
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
C
Chuck Lever 已提交
881 882
	if (data->flags & NFS_MOUNT_NORESVPORT)
		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
883

884
	/* Allocate or find a client reference we can use */
C
Chuck Lever 已提交
885
	clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
886 887 888 889 890 891 892 893
	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 */
894
	server->flags = data->flags;
895
	server->options = data->options;
896 897
	server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
		NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
898
		NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914

	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;

915 916
	server->port = data->nfs_server.port;

917
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
918 919 920
	if (error < 0)
		goto error;

921 922 923 924 925 926 927 928 929 930
	/* 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;

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
	server->namelen  = data->namlen;
	/* Create a client RPC handle for the NFSv3 ACL management interface */
	nfs_init_server_aclclient(server);
	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
 */
947 948 949
static void nfs_server_set_fsinfo(struct nfs_server *server,
				  struct nfs_fh *mntfh,
				  struct nfs_fsinfo *fsinfo)
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
{
	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
970

971
	server->backing_dev_info.name = "nfs";
972 973 974 975 976 977 978
	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;
979
	server->pnfs_blksize = fsinfo->blksize;
980
	set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
R
Ricardo Labiaga 已提交
981

982 983 984
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
985 986
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
987 988 989 990 991 992 993 994 995 996
	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
997 998
	server->time_delta = fsinfo->time_delta;

999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
	/* 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
 */
static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
{
	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
1021
	fsinfo.layouttype = 0;
1022 1023 1024 1025
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

1026
	nfs_server_set_fsinfo(server, mntfh, &fsinfo);
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052

	/* 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;
}

/*
 * Copy useful information when duplicating a server record
 */
static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
{
	target->flags = source->flags;
1053 1054
	target->rsize = source->rsize;
	target->wsize = source->wsize;
1055 1056 1057 1058 1059
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
1060
	target->options = source->options;
1061 1062
}

1063 1064 1065
static void nfs_server_insert_lists(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;
1066
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1067

1068
	spin_lock(&nn->nfs_client_lock);
1069
	list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
1070
	list_add_tail(&server->master_link, &nn->nfs_volume_list);
1071
	clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1072
	spin_unlock(&nn->nfs_client_lock);
1073 1074 1075 1076 1077

}

static void nfs_server_remove_lists(struct nfs_server *server)
{
1078
	struct nfs_client *clp = server->nfs_client;
1079
	struct nfs_net *nn;
1080

1081 1082
	if (clp == NULL)
		return;
1083
	nn = net_generic(clp->cl_net, nfs_net_id);
1084
	spin_lock(&nn->nfs_client_lock);
1085
	list_del_rcu(&server->client_link);
1086
	if (list_empty(&clp->cl_superblocks))
1087
		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1088
	list_del(&server->master_link);
1089
	spin_unlock(&nn->nfs_client_lock);
1090 1091 1092 1093

	synchronize_rcu();
}

1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
/*
 * Allocate and initialise a server record
 */
static struct nfs_server *nfs_alloc_server(void)
{
	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);
1110
	INIT_LIST_HEAD(&server->delegations);
1111
	INIT_LIST_HEAD(&server->layouts);
1112
	INIT_LIST_HEAD(&server->state_owners_lru);
1113

1114 1115
	atomic_set(&server->active, 0);

1116 1117 1118 1119 1120 1121
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

1122 1123 1124 1125 1126 1127
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

1128
	ida_init(&server->openowner_id);
1129
	ida_init(&server->lockowner_id);
F
Fred Isaman 已提交
1130 1131
	pnfs_init_server(server);

1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
	return server;
}

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

1142
	nfs_server_remove_lists(server);
R
Ricardo Labiaga 已提交
1143
	unset_pnfs_layoutdriver(server);
1144 1145 1146

	if (server->destroy != NULL)
		server->destroy(server);
1147 1148 1149

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1150 1151 1152 1153 1154
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

1155
	ida_destroy(&server->lockowner_id);
1156
	ida_destroy(&server->openowner_id);
1157
	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
1158
	bdi_destroy(&server->backing_dev_info);
1159 1160 1161 1162 1163 1164 1165 1166 1167
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1168
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1169 1170 1171
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1172
	struct nfs_fattr *fattr;
1173 1174 1175 1176 1177 1178
	int error;

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

1179 1180 1181 1182 1183
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	/* Get a client representation */
	error = nfs_init_server(server, data);
	if (error < 0)
		goto error;

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	/* Probe the root fh to retrieve its FSID */
1194
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1195 1196
	if (error < 0)
		goto error;
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206
	if (server->nfs_client->rpc_ops->version == 3) {
		if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
			server->namelen = NFS3_MAXNAMLEN;
		if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
			server->caps |= NFS_CAP_READDIRPLUS;
	} else {
		if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
			server->namelen = NFS2_MAXNAMLEN;
	}

1207 1208
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1209 1210 1211 1212 1213
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1214
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1215

1216 1217 1218
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1219

1220
	nfs_server_insert_lists(server);
1221
	server->mount_time = jiffies;
1222
	nfs_free_fattr(fattr);
1223 1224 1225
	return server;

error:
1226
	nfs_free_fattr(fattr);
1227 1228 1229 1230 1231
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1232 1233 1234 1235 1236 1237
/*
 * NFSv4.0 callback thread helper
 *
 * Find a client by callback identifier
 */
struct nfs_client *
1238
nfs4_find_client_ident(struct net *net, int cb_ident)
1239 1240
{
	struct nfs_client *clp;
1241
	struct nfs_net *nn = net_generic(net, nfs_net_id);
1242

1243
	spin_lock(&nn->nfs_client_lock);
1244
	clp = idr_find(&nn->cb_ident_idr, cb_ident);
1245 1246
	if (clp)
		atomic_inc(&clp->cl_count);
1247
	spin_unlock(&nn->nfs_client_lock);
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	return clp;
}

#if defined(CONFIG_NFS_V4_1)
/*
 * NFSv4.1 callback thread helper
 * For CB_COMPOUND calls, find a client by IP address, protocol version,
 * minorversion, and sessionID
 *
 * Returns NULL if no such client
 */
struct nfs_client *
1260
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1261
			   struct nfs4_sessionid *sid)
1262 1263
{
	struct nfs_client *clp;
1264
	struct nfs_net *nn = net_generic(net, nfs_net_id);
1265

1266
	spin_lock(&nn->nfs_client_lock);
1267
	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
1268 1269 1270 1271 1272 1273
		if (nfs4_cb_match_client(addr, clp, 1) == false)
			continue;

		if (!nfs4_has_session(clp))
			continue;

1274 1275 1276
		/* Match sessionid*/
		if (memcmp(clp->cl_session->sess_id.data,
		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
1277 1278 1279
			continue;

		atomic_inc(&clp->cl_count);
1280
		spin_unlock(&nn->nfs_client_lock);
1281 1282
		return clp;
	}
1283
	spin_unlock(&nn->nfs_client_lock);
1284 1285 1286 1287 1288 1289
	return NULL;
}

#else /* CONFIG_NFS_V4_1 */

struct nfs_client *
1290
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1291
			   struct nfs4_sessionid *sid)
1292 1293 1294 1295 1296
{
	return NULL;
}
#endif /* CONFIG_NFS_V4_1 */

1297 1298 1299 1300 1301 1302 1303 1304
/*
 * Initialize the NFS4 callback service
 */
static int nfs4_init_callback(struct nfs_client *clp)
{
	int error;

	if (clp->rpc_ops->version == 4) {
1305 1306 1307 1308
		struct rpc_xprt *xprt;

		xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);

A
Andy Adamson 已提交
1309
		if (nfs4_has_session(clp)) {
1310
			error = xprt_setup_backchannel(xprt,
A
Andy Adamson 已提交
1311 1312 1313 1314 1315
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1316
		error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
		if (error < 0) {
			dprintk("%s: failed to start callback. Error = %d\n",
				__func__, error);
			return error;
		}
		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
	}
	return 0;
}

1327 1328 1329 1330 1331 1332
/*
 * Initialize the minor version specific parts of an NFS4 client record
 */
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
#if defined(CONFIG_NFS_V4_1)
1333
	if (clp->cl_mvops->minor_version) {
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
		struct nfs4_session *session = NULL;
		/*
		 * Create the session and mark it expired.
		 * When a SEQUENCE operation encounters the expired session
		 * it will do session recovery to initialize it.
		 */
		session = nfs4_alloc_session(clp);
		if (!session)
			return -ENOMEM;

		clp->cl_session = session;
1345 1346 1347 1348 1349 1350 1351
		/*
		 * The create session reply races with the server back
		 * channel probe. Mark the client NFS_CS_SESSION_INITING
		 * so that the client back channel can find the
		 * nfs_client struct
		 */
		clp->cl_cons_state = NFS_CS_SESSION_INITING;
1352 1353 1354
	}
#endif /* CONFIG_NFS_V4_1 */

1355
	return nfs4_init_callback(clp);
1356 1357
}

1358 1359 1360 1361 1362 1363 1364 1365 1366
/**
 * nfs4_init_client - Initialise an NFS4 client record
 *
 * @clp: nfs_client to initialise
 * @timeparms: timeout parameters for underlying RPC transport
 * @ip_addr: callback IP address in presentation format
 * @authflavor: authentication flavor for underlying RPC transport
 *
 * Returns pointer to an NFS client, or an ERR_PTR value.
1367
 */
1368 1369 1370
struct nfs_client *nfs4_init_client(struct nfs_client *clp,
				    const struct rpc_timeout *timeparms,
				    const char *ip_addr,
C
Chuck Lever 已提交
1371
				    rpc_authflavor_t authflavour)
1372
{
C
Chuck Lever 已提交
1373
	char buf[INET6_ADDRSTRLEN + 1];
1374 1375 1376 1377 1378
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is initialised already */
		dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1379
		return clp;
1380 1381 1382 1383 1384
	}

	/* Check NFS protocol revision and initialize RPC op vector */
	clp->rpc_ops = &nfs_v4_clientops;

C
Chuck Lever 已提交
1385 1386
	__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
	error = nfs_create_rpc_client(clp, timeparms, authflavour);
1387 1388
	if (error < 0)
		goto error;
C
Chuck Lever 已提交
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402

	/* If no clientaddr= option was specified, find a usable cb address */
	if (ip_addr == NULL) {
		struct sockaddr_storage cb_addr;
		struct sockaddr *sap = (struct sockaddr *)&cb_addr;

		error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
		if (error < 0)
			goto error;
		error = rpc_ntop(sap, buf, sizeof(buf));
		if (error < 0)
			goto error;
		ip_addr = (const char *)buf;
	}
1403
	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1404 1405 1406 1407

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1408
			__func__, error);
1409 1410
		goto error;
	}
T
Trond Myklebust 已提交
1411
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1412

1413 1414 1415 1416
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1417 1418
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1419
	return clp;
1420 1421 1422

error:
	nfs_mark_client_ready(clp, error);
1423
	nfs_put_client(clp);
1424
	dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1425
	return ERR_PTR(error);
1426 1427 1428 1429 1430 1431
}

/*
 * Set up an NFS4 client
 */
static int nfs4_set_client(struct nfs_server *server,
1432 1433 1434
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1435
		const char *ip_addr,
1436
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1437
		int proto, const struct rpc_timeout *timeparms,
1438
		u32 minorversion, struct net *net)
1439
{
1440 1441
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1442 1443
		.addr = addr,
		.addrlen = addrlen,
1444
		.rpc_ops = &nfs_v4_clientops,
1445
		.proto = proto,
1446
		.minorversion = minorversion,
1447
		.net = net,
1448
	};
1449 1450 1451 1452 1453
	struct nfs_client *clp;
	int error;

	dprintk("--> nfs4_set_client()\n");

C
Chuck Lever 已提交
1454 1455 1456
	if (server->flags & NFS_MOUNT_NORESVPORT)
		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);

1457
	/* Allocate or find a client reference we can use */
C
Chuck Lever 已提交
1458
	clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
1459 1460 1461 1462 1463
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}

1464 1465 1466 1467 1468 1469 1470 1471 1472
	/*
	 * Query for the lease time on clientid setup or renewal
	 *
	 * Note that this will be set on nfs_clients that were created
	 * only for the DS role and did not set this bit, but now will
	 * serve a dual role.
	 */
	set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);

1473 1474 1475 1476 1477 1478 1479 1480
	server->nfs_client = clp;
	dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
	return 0;
error:
	dprintk("<-- nfs4_set_client() = xerror %d\n", error);
	return error;
}

A
Andy Adamson 已提交
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
/*
 * Set up a pNFS Data Server client.
 *
 * Return any existing nfs_client that matches server address,port,version
 * and minorversion.
 *
 * For a new nfs_client, use a soft mount (default), a low retrans and a
 * low timeout interval so that if a connection is lost, we retry through
 * the MDS.
 */
struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
1492 1493
		const struct sockaddr *ds_addr, int ds_addrlen,
		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
A
Andy Adamson 已提交
1494 1495 1496 1497 1498 1499 1500
{
	struct nfs_client_initdata cl_init = {
		.addr = ds_addr,
		.addrlen = ds_addrlen,
		.rpc_ops = &nfs_v4_clientops,
		.proto = ds_proto,
		.minorversion = mds_clp->cl_minorversion,
1501
		.net = mds_clp->cl_net,
A
Andy Adamson 已提交
1502
	};
1503
	struct rpc_timeout ds_timeout;
A
Andy Adamson 已提交
1504 1505 1506 1507 1508 1509 1510
	struct nfs_client *clp;

	/*
	 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
	 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
	 * (section 13.1 RFC 5661).
	 */
1511
	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
A
Andy Adamson 已提交
1512
	clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
C
Chuck Lever 已提交
1513
			     mds_clp->cl_rpcclient->cl_auth->au_flavor);
A
Andy Adamson 已提交
1514 1515 1516 1517

	dprintk("<-- %s %p\n", __func__, clp);
	return clp;
}
1518
EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1519

1520 1521 1522 1523 1524 1525 1526 1527
/*
 * Session has been established, and the client marked ready.
 * Set the mount rsize and wsize with negotiated fore channel
 * attributes which will be bound checked in nfs_server_set_fsinfo.
 */
static void nfs4_session_set_rwsize(struct nfs_server *server)
{
#ifdef CONFIG_NFS_V4_1
1528 1529 1530 1531
	struct nfs4_session *sess;
	u32 server_resp_sz;
	u32 server_rqst_sz;

1532 1533
	if (!nfs4_has_session(server->nfs_client))
		return;
1534 1535 1536 1537 1538 1539 1540 1541
	sess = server->nfs_client->cl_session;
	server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
	server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;

	if (server->rsize > server_resp_sz)
		server->rsize = server_resp_sz;
	if (server->wsize > server_rqst_sz)
		server->wsize = server_rqst_sz;
1542 1543 1544
#endif /* CONFIG_NFS_V4_1 */
}

1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
static int nfs4_server_common_setup(struct nfs_server *server,
		struct nfs_fh *mntfh)
{
	struct nfs_fattr *fattr;
	int error;

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

1555 1556 1557 1558
	/* data servers support only a subset of NFSv4.1 */
	if (is_ds_only_client(server->nfs_client))
		return -EPROTONOSUPPORT;

1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		return -ENOMEM;

	/* We must ensure the session is initialised first */
	error = nfs4_init_session(server);
	if (error < 0)
		goto out;

	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_get_rootfh(server, mntfh);
	if (error < 0)
		goto out;

	dprintk("Server FSID: %llx:%llx\n",
			(unsigned long long) server->fsid.major,
			(unsigned long long) server->fsid.minor);
	dprintk("Mount FH: %d\n", mntfh->size);

	nfs4_session_set_rwsize(server);

	error = nfs_probe_fsinfo(server, mntfh, fattr);
	if (error < 0)
		goto out;

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

1587
	nfs_server_insert_lists(server);
1588
	server->mount_time = jiffies;
1589
	server->destroy = nfs4_destroy_server;
1590 1591 1592 1593 1594
out:
	nfs_free_fattr(fattr);
	return error;
}

1595 1596 1597 1598
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1599
		const struct nfs_parsed_mount_data *data)
1600
{
1601
	struct rpc_timeout timeparms;
1602 1603 1604 1605
	int error;

	dprintk("--> nfs4_init_server()\n");

1606 1607 1608
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1609 1610
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
B
Bryan Schumaker 已提交
1611 1612 1613
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
	if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
			server->caps |= NFS_CAP_READDIRPLUS;
1614
	server->options = data->options;
1615

1616 1617 1618 1619 1620 1621 1622 1623
	/* Get a client record */
	error = nfs4_set_client(server,
			data->nfs_server.hostname,
			(const struct sockaddr *)&data->nfs_server.address,
			data->nfs_server.addrlen,
			data->client_address,
			data->auth_flavors[0],
			data->nfs_server.protocol,
B
Benny Halevy 已提交
1624
			&timeparms,
1625 1626
			data->minorversion,
			data->net);
1627 1628 1629
	if (error < 0)
		goto error;

1630 1631 1632 1633 1634 1635 1636
	/*
	 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
	 * authentication.
	 */
	if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
		server->caps |= NFS_CAP_UIDGID_NOMAP;

1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
	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;

1647 1648
	server->port = data->nfs_server.port;

1649
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1650

1651
error:
1652 1653 1654 1655 1656 1657 1658 1659 1660
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1661
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
				      struct nfs_fh *mntfh)
{
	struct nfs_server *server;
	int error;

	dprintk("--> nfs4_create_server()\n");

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

	/* set up the general RPC client */
1674
	error = nfs4_init_server(server, data);
1675 1676 1677
	if (error < 0)
		goto error;

1678
	error = nfs4_server_common_setup(server, mntfh);
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
	if (error < 0)
		goto error;

	dprintk("<-- nfs4_create_server() = %p\n", server);
	return server;

error:
	nfs_free_server(server);
	dprintk("<-- nfs4_create_server() = error %d\n", error);
	return ERR_PTR(error);
}

/*
 * Create an NFS4 referral server record
 */
struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1695
					       struct nfs_fh *mntfh)
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
{
	struct nfs_client *parent_client;
	struct nfs_server *server, *parent_server;
	int error;

	dprintk("--> nfs4_create_referral_server()\n");

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

	parent_server = NFS_SB(data->sb);
	parent_client = parent_server->nfs_client;

1710 1711
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1712
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1713

1714 1715
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1716
	error = nfs4_set_client(server, data->hostname,
1717 1718
				data->addr,
				data->addrlen,
1719 1720
				parent_client->cl_ipaddr,
				data->authflavor,
1721
				rpc_protocol(parent_server->client),
B
Benny Halevy 已提交
1722
				parent_server->client->cl_timeout,
1723
				parent_client->cl_mvops->minor_version,
1724
				parent_client->cl_net);
1725 1726
	if (error < 0)
		goto error;
1727

1728
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1729 1730 1731
	if (error < 0)
		goto error;

1732
	error = nfs4_server_common_setup(server, mntfh);
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
	if (error < 0)
		goto error;

	dprintk("<-- nfs_create_referral_server() = %p\n", server);
	return server;

error:
	nfs_free_server(server);
	dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
	return ERR_PTR(error);
}

#endif /* CONFIG_NFS_V4 */

/*
 * Clone an NFS2, NFS3 or NFS4 server record
 */
struct nfs_server *nfs_clone_server(struct nfs_server *source,
				    struct nfs_fh *fh,
1752 1753
				    struct nfs_fattr *fattr,
				    rpc_authflavor_t flavor)
1754 1755
{
	struct nfs_server *server;
1756
	struct nfs_fattr *fattr_fsinfo;
1757 1758 1759
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1760 1761
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1762 1763 1764 1765 1766

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

1767 1768 1769 1770 1771
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1772 1773
	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
1774
	server->destroy = source->destroy;
1775 1776 1777 1778 1779
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1780 1781
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
1782
			flavor);
1783 1784 1785 1786 1787 1788
	if (error < 0)
		goto out_free_server;
	if (!IS_ERR(source->client_acl))
		nfs_init_server_aclclient(server);

	/* probe the filesystem info for this server filesystem */
1789
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1790 1791 1792
	if (error < 0)
		goto out_free_server;

1793 1794 1795
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1796
	dprintk("Cloned FSID: %llx:%llx\n",
1797 1798
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1799 1800 1801 1802 1803

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

1804
	nfs_server_insert_lists(server);
1805 1806
	server->mount_time = jiffies;

1807
	nfs_free_fattr(fattr_fsinfo);
1808 1809 1810 1811
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1812
	nfs_free_fattr(fattr_fsinfo);
1813 1814 1815 1816
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1817

1818 1819 1820 1821 1822
void nfs_clients_init(struct net *net)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	INIT_LIST_HEAD(&nn->nfs_client_list);
1823
	INIT_LIST_HEAD(&nn->nfs_volume_list);
1824 1825 1826
#ifdef CONFIG_NFS_V4
	idr_init(&nn->cb_ident_idr);
#endif
1827
	spin_lock_init(&nn->nfs_client_lock);
1828
	nn->boot_time = CURRENT_TIME;
1829 1830
}

1831 1832 1833 1834 1835 1836 1837 1838 1839
#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
1840
static const struct seq_operations nfs_server_list_ops = {
1841 1842 1843 1844 1845 1846
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1847
static const struct file_operations nfs_server_list_fops = {
1848 1849 1850 1851
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1852
	.owner		= THIS_MODULE,
1853 1854 1855 1856 1857 1858 1859 1860
};

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
1861
static const struct seq_operations nfs_volume_list_ops = {
1862 1863 1864 1865 1866 1867
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1868
static const struct file_operations nfs_volume_list_fops = {
1869 1870 1871 1872
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1873
	.owner		= THIS_MODULE,
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
};

/*
 * 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;
1884 1885
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1886 1887 1888 1889 1890 1891

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

	m = file->private_data;
1892
	m->private = net;
1893 1894 1895 1896 1897 1898 1899 1900 1901

	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)
{
1902 1903
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1904
	/* lock the list against modification */
1905
	spin_lock(&nn->nfs_client_lock);
1906
	return seq_list_start_head(&nn->nfs_client_list, *_pos);
1907 1908 1909 1910 1911 1912 1913
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1914 1915 1916
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_client_list, pos);
1917 1918 1919 1920 1921 1922 1923
}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
1924 1925 1926
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
1927 1928 1929 1930 1931 1932 1933 1934
}

/*
 * 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;
1935
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1936 1937

	/* display header on line 1 */
1938
	if (v == &nn->nfs_client_list) {
1939 1940 1941 1942 1943 1944 1945
		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);

1946 1947 1948 1949
	/* Check if the client is initialized */
	if (clp->cl_cons_state != NFS_CS_READY)
		return 0;

1950
	rcu_read_lock();
1951
	seq_printf(m, "v%u %s %s %3d %s\n",
1952
		   clp->rpc_ops->version,
1953 1954
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1955 1956
		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);
1957
	rcu_read_unlock();
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968

	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;
1969 1970
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1971 1972 1973 1974 1975 1976

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

	m = file->private_data;
1977
	m->private = net;
1978 1979 1980 1981 1982 1983 1984 1985 1986

	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)
{
1987 1988
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1989
	/* lock the list against modification */
1990
	spin_lock(&nn->nfs_client_lock);
1991
	return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1992 1993 1994 1995 1996 1997 1998
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1999 2000 2001
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_volume_list, pos);
2002 2003 2004 2005 2006 2007 2008
}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
2009 2010 2011
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
}

/*
 * 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];
2022
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
2023 2024

	/* display header on line 1 */
2025
	if (v == &nn->nfs_volume_list) {
D
David Howells 已提交
2026
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
		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",
2037 2038
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
2039

2040
	rcu_read_lock();
D
David Howells 已提交
2041
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
2042
		   clp->rpc_ops->version,
2043 2044
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
2045
		   dev,
D
David Howells 已提交
2046 2047
		   fsid,
		   nfs_server_fscache_state(server));
2048
	rcu_read_unlock();
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059

	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
2060
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
2061 2062 2063 2064
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
2065 2066
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
2067 2068 2069 2070
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
2071 2072
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
2073 2074 2075 2076 2077 2078 2079
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
2080
	remove_proc_entry("fs/nfsfs", NULL);
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091
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
2092
	remove_proc_entry("fs/nfsfs", NULL);
2093 2094 2095
}

#endif /* CONFIG_PROC_FS */
2096 2097 2098 2099

module_param(nfs4_disable_idmapping, bool, 0644);
MODULE_PARM_DESC(nfs4_disable_idmapping,
		"Turn off NFSv4 idmapping when using 'sec=sys'");