client.c 51.5 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 <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 <asm/system.h>

#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->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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	[2]			= &nfs_version2,
#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 {
	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->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_boot_time = CURRENT_TIME;
	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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}
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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->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->net);
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	kfree(clp->cl_hostname);
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	kfree(clp->server_scope);
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	kfree(clp->impl_id);
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	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->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);
}

/*
 * 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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}

/*
 * 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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/* Common match routine for v4.0 and v4.1 callback services */
bool
nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
		     u32 minorversion)
449
{
450
	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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/*
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 * Find an nfs_client on the list that matches the initialisation data
 * that is supplied.
472
 */
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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;
500
	}
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	return NULL;
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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,
	       rpc_authflavor_t authflavour,
	       int noresvport)
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{
	struct nfs_client *clp, *new = NULL;
	int error;
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	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)
			goto found_client;
		if (new)
			goto install_client;

532
		spin_unlock(&nn->nfs_client_lock);
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		new = nfs_alloc_client(cl_init);
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	} while (!IS_ERR(new));
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	dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
	return new;
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	/* install a new client and return with it unready */
install_client:
	clp = new;
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	list_add(&clp->cl_share_link, &nn->nfs_client_list);
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	spin_unlock(&nn->nfs_client_lock);
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	error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
					      authflavour, noresvport);
	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(error);
	}
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	dprintk("--> nfs_get_client() = %p [new]\n", clp);
	return clp;

	/* found an existing client
	 * - make sure it's ready before returning
	 */
found_client:
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	spin_unlock(&nn->nfs_client_lock);
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	if (new)
		nfs_free_client(new);

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	error = wait_event_killable(nfs_client_active_wq,
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				clp->cl_cons_state < NFS_CS_INITING);
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	if (error < 0) {
		nfs_put_client(clp);
		return ERR_PTR(-ERESTARTSYS);
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	}

	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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	BUG_ON(clp->cl_cons_state != NFS_CS_READY);

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	dprintk("--> nfs_get_client() = %p [share]\n", clp);
	return clp;
}

/*
 * 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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{
	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;
}

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/*
 * 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) {
618
	case XPRT_TRANSPORT_TCP:
\
\"Talpey, Thomas\ 已提交
619
	case XPRT_TRANSPORT_RDMA:
620 621
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
622
		if (to->to_initval == 0)
623
			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
624 625 626 627
		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);
628 629 630 631
		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;
632 633
		to->to_exponential = 0;
		break;
634
	case XPRT_TRANSPORT_UDP:
635 636
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
637
		if (!to->to_initval)
638
			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
639 640 641 642 643
		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;
644 645
	default:
		BUG();
646 647 648 649 650 651
	}
}

/*
 * Create an RPC client handle
 */
652
static int nfs_create_rpc_client(struct nfs_client *clp,
653 654
				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
655
				 int discrtry, int noresvport)
656 657
{
	struct rpc_clnt		*clnt = NULL;
658
	struct rpc_create_args args = {
659
		.net		= clp->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

670 671 672 673 674
	if (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		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->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__);
795 796 797 798 799 800 801 802 803 804 805 806 807
			return PTR_ERR(auth);
		}
	}
	server->client->cl_softrtry = 0;
	if (server->flags & NFS_MOUNT_SOFT)
		server->client->cl_softrtry = 1;

	return 0;
}

/*
 * Initialise an NFS2 or NFS3 client
 */
808 809 810
int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
		    const char *ip_addr, rpc_authflavor_t authflavour,
		    int noresvport)
811 812 813 814 815 816 817 818 819 820 821 822 823
{
	int error;

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

	/*
	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
	 * - RFC 2623, sec 2.3.2
	 */
C
Chuck Lever 已提交
824
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
825
				      0, noresvport);
826 827 828 829 830 831 832 833 834 835 836 837 838 839
	if (error < 0)
		goto error;
	nfs_mark_client_ready(clp, NFS_CS_READY);
	return 0;

error:
	nfs_mark_client_ready(clp, error);
	dprintk("<-- nfs_init_client() = xerror %d\n", error);
	return error;
}

/*
 * Create a version 2 or 3 client
 */
840 841
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
842
{
843 844
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
845
		.addr = (const struct sockaddr *)&data->nfs_server.address,
846
		.addrlen = data->nfs_server.addrlen,
847
		.rpc_ops = &nfs_v2_clientops,
848
		.proto = data->nfs_server.protocol,
849
		.net = data->net,
850
	};
851
	struct rpc_timeout timeparms;
852
	struct nfs_client *clp;
853
	int error;
854 855 856 857

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

#ifdef CONFIG_NFS_V3
858
	if (data->version == 3)
859
		cl_init.rpc_ops = &nfs_v3_clientops;
860 861
#endif

862 863 864
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

865
	/* Allocate or find a client reference we can use */
866 867
	clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX,
			     data->flags & NFS_MOUNT_NORESVPORT);
868 869 870 871 872 873 874 875
	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 */
876
	server->flags = data->flags;
877
	server->options = data->options;
878 879 880
	server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
		NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
		NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896

	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;

897 898
	server->port = data->nfs_server.port;

899
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
900 901 902
	if (error < 0)
		goto error;

903 904 905 906 907 908 909 910 911 912
	/* 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;

913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
	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
 */
929 930 931
static void nfs_server_set_fsinfo(struct nfs_server *server,
				  struct nfs_fh *mntfh,
				  struct nfs_fsinfo *fsinfo)
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
{
	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
952

953
	server->backing_dev_info.name = "nfs";
954 955 956 957 958 959 960
	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;
961
	server->pnfs_blksize = fsinfo->blksize;
962
	set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
R
Ricardo Labiaga 已提交
963

964 965 966
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
967 968
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
969 970 971 972 973 974 975 976 977 978
	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
979 980
	server->time_delta = fsinfo->time_delta;

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
	/* 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
1003
	fsinfo.layouttype = 0;
1004 1005 1006 1007
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

1008
	nfs_server_set_fsinfo(server, mntfh, &fsinfo);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034

	/* 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;
1035 1036
	target->rsize = source->rsize;
	target->wsize = source->wsize;
1037 1038 1039 1040 1041
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
1042
	target->options = source->options;
1043 1044
}

1045 1046 1047
static void nfs_server_insert_lists(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;
1048
	struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
1049

1050
	spin_lock(&nn->nfs_client_lock);
1051
	list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
1052
	list_add_tail(&server->master_link, &nn->nfs_volume_list);
1053
	clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1054
	spin_unlock(&nn->nfs_client_lock);
1055 1056 1057 1058 1059

}

static void nfs_server_remove_lists(struct nfs_server *server)
{
1060
	struct nfs_client *clp = server->nfs_client;
1061
	struct nfs_net *nn;
1062

1063 1064 1065
	if (clp == NULL)
		return;
	nn = net_generic(clp->net, nfs_net_id);
1066
	spin_lock(&nn->nfs_client_lock);
1067
	list_del_rcu(&server->client_link);
1068
	if (list_empty(&clp->cl_superblocks))
1069
		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1070
	list_del(&server->master_link);
1071
	spin_unlock(&nn->nfs_client_lock);
1072 1073 1074 1075

	synchronize_rcu();
}

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
/*
 * 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);
1092
	INIT_LIST_HEAD(&server->delegations);
1093
	INIT_LIST_HEAD(&server->layouts);
1094
	INIT_LIST_HEAD(&server->state_owners_lru);
1095

1096 1097
	atomic_set(&server->active, 0);

1098 1099 1100 1101 1102 1103
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

1104 1105 1106 1107 1108 1109
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

1110
	ida_init(&server->openowner_id);
1111
	ida_init(&server->lockowner_id);
F
Fred Isaman 已提交
1112 1113
	pnfs_init_server(server);

1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
	return server;
}

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

1124
	nfs_server_remove_lists(server);
R
Ricardo Labiaga 已提交
1125
	unset_pnfs_layoutdriver(server);
1126 1127 1128

	if (server->destroy != NULL)
		server->destroy(server);
1129 1130 1131

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1132 1133 1134 1135 1136
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

1137
	ida_destroy(&server->lockowner_id);
1138
	ida_destroy(&server->openowner_id);
1139
	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
1140
	bdi_destroy(&server->backing_dev_info);
1141 1142 1143 1144 1145 1146 1147 1148 1149
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1150
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1151 1152 1153
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1154
	struct nfs_fattr *fattr;
1155 1156 1157 1158 1159 1160
	int error;

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

1161 1162 1163 1164 1165
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
	/* 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 */
1176
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1177 1178
	if (error < 0)
		goto error;
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	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;
	}

1189 1190
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1191 1192 1193 1194 1195
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1196
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1197

1198 1199 1200
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1201

1202
	nfs_server_insert_lists(server);
1203
	server->mount_time = jiffies;
1204
	nfs_free_fattr(fattr);
1205 1206 1207
	return server;

error:
1208
	nfs_free_fattr(fattr);
1209 1210 1211 1212 1213
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1214 1215 1216 1217 1218 1219
/*
 * NFSv4.0 callback thread helper
 *
 * Find a client by callback identifier
 */
struct nfs_client *
1220
nfs4_find_client_ident(struct net *net, int cb_ident)
1221 1222
{
	struct nfs_client *clp;
1223
	struct nfs_net *nn = net_generic(net, nfs_net_id);
1224

1225
	spin_lock(&nn->nfs_client_lock);
1226
	clp = idr_find(&nn->cb_ident_idr, cb_ident);
1227 1228
	if (clp)
		atomic_inc(&clp->cl_count);
1229
	spin_unlock(&nn->nfs_client_lock);
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
	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 *
1242
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1243
			   struct nfs4_sessionid *sid)
1244 1245
{
	struct nfs_client *clp;
1246
	struct nfs_net *nn = net_generic(net, nfs_net_id);
1247

1248
	spin_lock(&nn->nfs_client_lock);
1249
	list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
1250 1251 1252 1253 1254 1255
		if (nfs4_cb_match_client(addr, clp, 1) == false)
			continue;

		if (!nfs4_has_session(clp))
			continue;

1256 1257 1258
		/* Match sessionid*/
		if (memcmp(clp->cl_session->sess_id.data,
		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
1259 1260 1261
			continue;

		atomic_inc(&clp->cl_count);
1262
		spin_unlock(&nn->nfs_client_lock);
1263 1264
		return clp;
	}
1265
	spin_unlock(&nn->nfs_client_lock);
1266 1267 1268 1269 1270 1271
	return NULL;
}

#else /* CONFIG_NFS_V4_1 */

struct nfs_client *
1272
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1273
			   struct nfs4_sessionid *sid)
1274 1275 1276 1277 1278
{
	return NULL;
}
#endif /* CONFIG_NFS_V4_1 */

1279 1280 1281 1282 1283 1284 1285 1286
/*
 * Initialize the NFS4 callback service
 */
static int nfs4_init_callback(struct nfs_client *clp)
{
	int error;

	if (clp->rpc_ops->version == 4) {
1287 1288 1289 1290
		struct rpc_xprt *xprt;

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

A
Andy Adamson 已提交
1291
		if (nfs4_has_session(clp)) {
1292
			error = xprt_setup_backchannel(xprt,
A
Andy Adamson 已提交
1293 1294 1295 1296 1297
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1298
		error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
		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;
}

1309 1310 1311 1312 1313 1314
/*
 * 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)
1315
	if (clp->cl_mvops->minor_version) {
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
		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;
1327 1328 1329 1330 1331 1332 1333
		/*
		 * 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;
1334 1335 1336
	}
#endif /* CONFIG_NFS_V4_1 */

1337
	return nfs4_init_callback(clp);
1338 1339
}

1340 1341 1342
/*
 * Initialise an NFS4 client record
 */
1343 1344 1345 1346 1347
int nfs4_init_client(struct nfs_client *clp,
		     const struct rpc_timeout *timeparms,
		     const char *ip_addr,
		     rpc_authflavor_t authflavour,
		     int noresvport)
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
{
	int error;

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

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

1360
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
1361
				      1, noresvport);
1362 1363
	if (error < 0)
		goto error;
1364
	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1365 1366 1367 1368

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1369
			__func__, error);
1370 1371
		goto error;
	}
T
Trond Myklebust 已提交
1372
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1373

1374 1375 1376 1377
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1378 1379
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
	return 0;

error:
	nfs_mark_client_ready(clp, error);
	dprintk("<-- nfs4_init_client() = xerror %d\n", error);
	return error;
}

/*
 * Set up an NFS4 client
 */
static int nfs4_set_client(struct nfs_server *server,
1392 1393 1394
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1395
		const char *ip_addr,
1396
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1397
		int proto, const struct rpc_timeout *timeparms,
1398
		u32 minorversion, struct net *net)
1399
{
1400 1401
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1402 1403
		.addr = addr,
		.addrlen = addrlen,
1404
		.rpc_ops = &nfs_v4_clientops,
1405
		.proto = proto,
1406
		.minorversion = minorversion,
1407
		.net = net,
1408
	};
1409 1410 1411 1412 1413 1414
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1415 1416
	clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour,
			     server->flags & NFS_MOUNT_NORESVPORT);
1417 1418 1419 1420 1421
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}

1422 1423 1424 1425 1426 1427 1428 1429 1430
	/*
	 * 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);

1431 1432 1433 1434 1435 1436 1437 1438
	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
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
/*
 * 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,
		const struct sockaddr *ds_addr,
		int ds_addrlen, int ds_proto)
{
	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,
1459
		.net = mds_clp->net,
A
Andy Adamson 已提交
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479
	};
	struct rpc_timeout ds_timeout = {
		.to_initval = 15 * HZ,
		.to_maxval = 15 * HZ,
		.to_retries = 1,
		.to_exponential = 1,
	};
	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).
	 */
	clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
			     mds_clp->cl_rpcclient->cl_auth->au_flavor, 0);

	dprintk("<-- %s %p\n", __func__, clp);
	return clp;
}
1480
EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1481

1482 1483 1484 1485 1486 1487 1488 1489
/*
 * 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
1490 1491 1492 1493
	struct nfs4_session *sess;
	u32 server_resp_sz;
	u32 server_rqst_sz;

1494 1495
	if (!nfs4_has_session(server->nfs_client))
		return;
1496 1497 1498 1499 1500 1501 1502 1503
	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;
1504 1505 1506
#endif /* CONFIG_NFS_V4_1 */
}

1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
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);

1517 1518 1519 1520
	/* data servers support only a subset of NFSv4.1 */
	if (is_ds_only_client(server->nfs_client))
		return -EPROTONOSUPPORT;

1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
	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;

1549
	nfs_server_insert_lists(server);
1550
	server->mount_time = jiffies;
1551
	server->destroy = nfs4_destroy_server;
1552 1553 1554 1555 1556
out:
	nfs_free_fattr(fattr);
	return error;
}

1557 1558 1559 1560
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1561
		const struct nfs_parsed_mount_data *data)
1562
{
1563
	struct rpc_timeout timeparms;
1564 1565 1566 1567
	int error;

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

1568 1569 1570
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1571 1572
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
B
Bryan Schumaker 已提交
1573 1574 1575
	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;
1576
	server->options = data->options;
1577

1578 1579 1580 1581 1582 1583 1584 1585
	/* 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
1586
			&timeparms,
1587 1588
			data->minorversion,
			data->net);
1589 1590 1591
	if (error < 0)
		goto error;

1592 1593 1594 1595 1596 1597 1598
	/*
	 * 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;

1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
	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;

1609 1610
	server->port = data->nfs_server.port;

1611
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1612

1613
error:
1614 1615 1616 1617 1618 1619 1620 1621 1622
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1623
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
				      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 */
1636
	error = nfs4_init_server(server, data);
1637 1638 1639
	if (error < 0)
		goto error;

1640
	error = nfs4_server_common_setup(server, mntfh);
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
	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,
1657
					       struct nfs_fh *mntfh)
1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671
{
	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;

1672 1673
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1674
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1675

1676 1677
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1678
	error = nfs4_set_client(server, data->hostname,
1679 1680
				data->addr,
				data->addrlen,
1681 1682
				parent_client->cl_ipaddr,
				data->authflavor,
1683
				rpc_protocol(parent_server->client),
B
Benny Halevy 已提交
1684
				parent_server->client->cl_timeout,
1685 1686
				parent_client->cl_mvops->minor_version,
				parent_client->net);
1687 1688
	if (error < 0)
		goto error;
1689

1690
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1691 1692 1693
	if (error < 0)
		goto error;

1694
	error = nfs4_server_common_setup(server, mntfh);
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716
	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,
				    struct nfs_fattr *fattr)
{
	struct nfs_server *server;
1717
	struct nfs_fattr *fattr_fsinfo;
1718 1719 1720
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1721 1722
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1723 1724 1725 1726 1727

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

1728 1729 1730 1731 1732
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1733 1734
	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
1735
	server->destroy = source->destroy;
1736 1737 1738 1739 1740
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1741 1742 1743
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1744 1745 1746 1747 1748 1749
	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 */
1750
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1751 1752 1753
	if (error < 0)
		goto out_free_server;

1754 1755 1756
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1757
	dprintk("Cloned FSID: %llx:%llx\n",
1758 1759
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1760 1761 1762 1763 1764

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

1765
	nfs_server_insert_lists(server);
1766 1767
	server->mount_time = jiffies;

1768
	nfs_free_fattr(fattr_fsinfo);
1769 1770 1771 1772
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1773
	nfs_free_fattr(fattr_fsinfo);
1774 1775 1776 1777
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1778

1779 1780 1781 1782 1783
void nfs_clients_init(struct net *net)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	INIT_LIST_HEAD(&nn->nfs_client_list);
1784
	INIT_LIST_HEAD(&nn->nfs_volume_list);
1785 1786 1787
#ifdef CONFIG_NFS_V4
	idr_init(&nn->cb_ident_idr);
#endif
1788
	spin_lock_init(&nn->nfs_client_lock);
1789 1790
}

1791 1792 1793 1794 1795 1796 1797 1798 1799
#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
1800
static const struct seq_operations nfs_server_list_ops = {
1801 1802 1803 1804 1805 1806
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1807
static const struct file_operations nfs_server_list_fops = {
1808 1809 1810 1811
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1812
	.owner		= THIS_MODULE,
1813 1814 1815 1816 1817 1818 1819 1820
};

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
1821
static const struct seq_operations nfs_volume_list_ops = {
1822 1823 1824 1825 1826 1827
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1828
static const struct file_operations nfs_volume_list_fops = {
1829 1830 1831 1832
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1833
	.owner		= THIS_MODULE,
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
};

/*
 * 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;
1844 1845
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1846 1847 1848 1849 1850 1851

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

	m = file->private_data;
1852
	m->private = net;
1853 1854 1855 1856 1857 1858 1859 1860 1861

	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)
{
1862 1863
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1864
	/* lock the list against modification */
1865
	spin_lock(&nn->nfs_client_lock);
1866
	return seq_list_start_head(&nn->nfs_client_list, *_pos);
1867 1868 1869 1870 1871 1872 1873
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1874 1875 1876
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_client_list, pos);
1877 1878 1879 1880 1881 1882 1883
}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
1884 1885 1886
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
1887 1888 1889 1890 1891 1892 1893 1894
}

/*
 * 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;
1895
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1896 1897

	/* display header on line 1 */
1898
	if (v == &nn->nfs_client_list) {
1899 1900 1901 1902 1903 1904 1905
		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);

1906 1907 1908 1909
	/* Check if the client is initialized */
	if (clp->cl_cons_state != NFS_CS_READY)
		return 0;

1910
	rcu_read_lock();
1911
	seq_printf(m, "v%u %s %s %3d %s\n",
1912
		   clp->rpc_ops->version,
1913 1914
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1915 1916
		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);
1917
	rcu_read_unlock();
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928

	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;
1929 1930
	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1931 1932 1933 1934 1935 1936

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

	m = file->private_data;
1937
	m->private = net;
1938 1939 1940 1941 1942 1943 1944 1945 1946

	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)
{
1947 1948
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

1949
	/* lock the list against modification */
1950
	spin_lock(&nn->nfs_client_lock);
1951
	return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1952 1953 1954 1955 1956 1957 1958
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1959 1960 1961
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	return seq_list_next(v, &nn->nfs_volume_list, pos);
1962 1963 1964 1965 1966 1967 1968
}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
1969 1970 1971
	struct nfs_net *nn = net_generic(p->private, nfs_net_id);

	spin_unlock(&nn->nfs_client_lock);
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
}

/*
 * 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];
1982
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1983 1984

	/* display header on line 1 */
1985
	if (v == &nn->nfs_volume_list) {
D
David Howells 已提交
1986
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
		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",
1997 1998
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1999

2000
	rcu_read_lock();
D
David Howells 已提交
2001
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
2002
		   clp->rpc_ops->version,
2003 2004
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
2005
		   dev,
D
David Howells 已提交
2006 2007
		   fsid,
		   nfs_server_fscache_state(server));
2008
	rcu_read_unlock();
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

	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
2020
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
2021 2022 2023 2024
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
2025 2026
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
2027 2028 2029 2030
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
2031 2032
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
2033 2034 2035 2036 2037 2038 2039
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
2040
	remove_proc_entry("fs/nfsfs", NULL);
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
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
2052
	remove_proc_entry("fs/nfsfs", NULL);
2053 2054 2055
}

#endif /* CONFIG_PROC_FS */
2056 2057 2058 2059

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