client.c 36.5 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 <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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/*
 * 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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/*
 * Allocate a shared client record
 *
 * Since these are allocated/deallocated very rarely, we don't
 * bother putting them in a slab cache...
 */
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struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
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{
	struct nfs_client *clp;
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	struct rpc_cred *cred;
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	int err = -ENOMEM;
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	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
		goto error_0;

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	clp->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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	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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/* 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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#else
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void nfs_cleanup_cb_ident_idr(struct net *net)
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{
}

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

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

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

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

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	put_net(clp->cl_net);
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	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));

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

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

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

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

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

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

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

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

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

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

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

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

int nfs_wait_client_init_complete(const struct nfs_client *clp)
{
	return wait_event_killable(nfs_client_active_wq,
			nfs_client_init_is_complete(clp));
}

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

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

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

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	smp_rmb();

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

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/*
 * Look up a client by IP address and protocol version
 * - creates a new record if one doesn't yet exist
 */
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struct nfs_client *
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nfs_get_client(const struct nfs_client_initdata *cl_init,
	       const struct rpc_timeout *timeparms,
	       const char *ip_addr,
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	       rpc_authflavor_t authflavour)
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{
	struct nfs_client *clp, *new = NULL;
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	struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
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	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)
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				new->rpc_ops->free_client(new);
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			return nfs_found_client(cl_init, clp);
		}
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		if (new) {
			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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460
		new = cl_init->rpc_ops->alloc_client(cl_init);
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	} while (!IS_ERR(new));
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	dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
		cl_init->hostname ?: "", PTR_ERR(new));
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	return new;
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}

/*
 * Mark a server as ready or failed
 */
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void nfs_mark_client_ready(struct nfs_client *clp, int state)
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{
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	smp_wmb();
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	clp->cl_cons_state = state;
	wake_up_all(&nfs_client_active_wq);
}
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/*
 * Initialise the timeout values for a connection
 */
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void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
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				    unsigned int timeo, unsigned int retrans)
{
	to->to_initval = timeo * HZ / 10;
	to->to_retries = retrans;

	switch (proto) {
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	case XPRT_TRANSPORT_TCP:
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	case XPRT_TRANSPORT_RDMA:
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		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_TCP_RETRANS;
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		if (to->to_initval == 0)
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			to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
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		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
			to->to_initval = NFS_MAX_TCP_TIMEOUT;
		to->to_increment = to->to_initval;
		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
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		if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
			to->to_maxval = NFS_MAX_TCP_TIMEOUT;
		if (to->to_maxval < to->to_initval)
			to->to_maxval = to->to_initval;
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		to->to_exponential = 0;
		break;
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	case XPRT_TRANSPORT_UDP:
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		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
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		if (!to->to_initval)
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			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
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		if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
			to->to_initval = NFS_MAX_UDP_TIMEOUT;
		to->to_maxval = NFS_MAX_UDP_TIMEOUT;
		to->to_exponential = 1;
		break;
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	default:
		BUG();
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	}
}

/*
 * Create an RPC client handle
 */
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int nfs_create_rpc_client(struct nfs_client *clp,
			  const struct rpc_timeout *timeparms,
			  rpc_authflavor_t flavor)
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{
	struct rpc_clnt		*clnt = NULL;
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	struct rpc_create_args args = {
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		.net		= clp->cl_net,
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		.protocol	= clp->cl_proto,
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		.address	= (struct sockaddr *)&clp->cl_addr,
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		.addrsize	= clp->cl_addrlen,
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		.timeout	= timeparms,
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		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
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	if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
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		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
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	if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
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		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

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

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	clnt = rpc_create(&args);
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	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
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				__func__, PTR_ERR(clnt));
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		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
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/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
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	if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
			!(server->flags & NFS_MOUNT_LOCAL_FCNTL))
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		nlmclnt_done(server->nlm_host);
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}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
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	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
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	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,
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		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
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		.net		= clp->cl_net,
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	};
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	if (nlm_init.nfs_version > 3)
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		return 0;
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	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
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		return 0;

591 592 593 594 595 596 597 598
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

599
	host = nlmclnt_init(&nlm_init);
600 601 602 603 604 605
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
606 607 608 609 610 611 612 613
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
614
	if (server->nfs_client->rpc_ops->version != 3)
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640
		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
 */
641
int nfs_init_server_rpcclient(struct nfs_server *server,
642 643
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
644 645 646 647 648
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
649
		dprintk("%s: couldn't create rpc_client!\n", __func__);
650 651 652
		return PTR_ERR(server->client);
	}

653 654 655 656 657
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

658 659 660 661 662
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
663
			dprintk("%s: couldn't create credcache!\n", __func__);
664 665 666 667 668 669 670 671 672 673
			return PTR_ERR(auth);
		}
	}
	server->client->cl_softrtry = 0;
	if (server->flags & NFS_MOUNT_SOFT)
		server->client->cl_softrtry = 1;

	return 0;
}

674 675 676 677 678 679 680 681 682
/**
 * 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.
683
 */
684 685
struct nfs_client *nfs_init_client(struct nfs_client *clp,
		    const struct rpc_timeout *timeparms,
C
Chuck Lever 已提交
686
		    const char *ip_addr, rpc_authflavor_t authflavour)
687 688 689 690 691 692
{
	int error;

	if (clp->cl_cons_state == NFS_CS_READY) {
		/* the client is already initialised */
		dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
693
		return clp;
694 695 696 697 698 699
	}

	/*
	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
	 * - RFC 2623, sec 2.3.2
	 */
C
Chuck Lever 已提交
700
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
701 702 703
	if (error < 0)
		goto error;
	nfs_mark_client_ready(clp, NFS_CS_READY);
704
	return clp;
705 706 707

error:
	nfs_mark_client_ready(clp, error);
708
	nfs_put_client(clp);
709
	dprintk("<-- nfs_init_client() = xerror %d\n", error);
710
	return ERR_PTR(error);
711 712 713 714 715
}

/*
 * Create a version 2 or 3 client
 */
716 717
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
718
{
719 720
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
721
		.addr = (const struct sockaddr *)&data->nfs_server.address,
722
		.addrlen = data->nfs_server.addrlen,
B
Bryan Schumaker 已提交
723
		.rpc_ops = NULL,
724
		.proto = data->nfs_server.protocol,
725
		.net = data->net,
726
	};
727
	struct rpc_timeout timeparms;
728
	struct nfs_client *clp;
729
	int error;
730 731 732

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

B
Bryan Schumaker 已提交
733 734 735 736 737 738
	switch (data->version) {
#ifdef CONFIG_NFS_V2
	case 2:
		cl_init.rpc_ops = &nfs_v2_clientops;
		break;
#endif
739
#ifdef CONFIG_NFS_V3
B
Bryan Schumaker 已提交
740
	case 3:
741
		cl_init.rpc_ops = &nfs_v3_clientops;
B
Bryan Schumaker 已提交
742
		break;
743
#endif
B
Bryan Schumaker 已提交
744 745 746
	default:
		return -EPROTONOSUPPORT;
	}
747

748 749
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
C
Chuck Lever 已提交
750 751
	if (data->flags & NFS_MOUNT_NORESVPORT)
		set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
752

753
	/* Allocate or find a client reference we can use */
C
Chuck Lever 已提交
754
	clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
755 756 757 758 759 760 761 762
	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 */
763
	server->flags = data->flags;
764
	server->options = data->options;
765 766
	server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
		NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
767
		NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783

	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;

784 785
	server->port = data->nfs_server.port;

786
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
787 788 789
	if (error < 0)
		goto error;

790 791 792 793 794 795 796 797 798 799
	/* 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;

800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
	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
 */
816 817 818
static void nfs_server_set_fsinfo(struct nfs_server *server,
				  struct nfs_fh *mntfh,
				  struct nfs_fsinfo *fsinfo)
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
{
	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
839

840
	server->backing_dev_info.name = "nfs";
841 842 843 844 845 846 847
	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;
848
	server->pnfs_blksize = fsinfo->blksize;
R
Ricardo Labiaga 已提交
849

850 851 852
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
853 854
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
855 856 857 858 859 860 861 862 863 864
	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
865 866
	server->time_delta = fsinfo->time_delta;

867 868 869 870 871 872 873
	/* 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
 */
874
int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
875 876 877 878 879 880 881 882 883 884 885 886 887 888
{
	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
889
	fsinfo.layouttype = 0;
890 891 892 893
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

894
	nfs_server_set_fsinfo(server, mntfh, &fsinfo);
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917

	/* 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
 */
918
void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
919 920
{
	target->flags = source->flags;
921 922
	target->rsize = source->rsize;
	target->wsize = source->wsize;
923 924 925 926 927
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
928
	target->options = source->options;
929 930
}

931
void nfs_server_insert_lists(struct nfs_server *server)
932 933
{
	struct nfs_client *clp = server->nfs_client;
934
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
935

936
	spin_lock(&nn->nfs_client_lock);
937
	list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
938
	list_add_tail(&server->master_link, &nn->nfs_volume_list);
939
	clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
940
	spin_unlock(&nn->nfs_client_lock);
941 942 943 944 945

}

static void nfs_server_remove_lists(struct nfs_server *server)
{
946
	struct nfs_client *clp = server->nfs_client;
947
	struct nfs_net *nn;
948

949 950
	if (clp == NULL)
		return;
951
	nn = net_generic(clp->cl_net, nfs_net_id);
952
	spin_lock(&nn->nfs_client_lock);
953
	list_del_rcu(&server->client_link);
954
	if (list_empty(&clp->cl_superblocks))
955
		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
956
	list_del(&server->master_link);
957
	spin_unlock(&nn->nfs_client_lock);
958 959 960 961

	synchronize_rcu();
}

962 963 964
/*
 * Allocate and initialise a server record
 */
965
struct nfs_server *nfs_alloc_server(void)
966 967 968 969 970 971 972 973 974 975 976 977
{
	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);
978
	INIT_LIST_HEAD(&server->delegations);
979
	INIT_LIST_HEAD(&server->layouts);
980
	INIT_LIST_HEAD(&server->state_owners_lru);
981

982 983
	atomic_set(&server->active, 0);

984 985 986 987 988 989
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

990 991 992 993 994 995
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

996
	ida_init(&server->openowner_id);
997
	ida_init(&server->lockowner_id);
F
Fred Isaman 已提交
998 999
	pnfs_init_server(server);

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
	return server;
}

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

1010
	nfs_server_remove_lists(server);
1011 1012 1013

	if (server->destroy != NULL)
		server->destroy(server);
1014 1015 1016

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1017 1018 1019 1020 1021
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

1022
	ida_destroy(&server->lockowner_id);
1023
	ida_destroy(&server->openowner_id);
1024
	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
1025
	bdi_destroy(&server->backing_dev_info);
1026 1027 1028 1029 1030 1031 1032 1033 1034
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1035
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1036 1037 1038
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1039
	struct nfs_fattr *fattr;
1040 1041 1042 1043 1044 1045
	int error;

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

1046 1047 1048 1049 1050
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
	/* 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 */
1061
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1062 1063
	if (error < 0)
		goto error;
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
	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;
	}

1074 1075
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1076 1077 1078 1079 1080
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1081
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1082

1083 1084 1085
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1086

1087
	nfs_server_insert_lists(server);
1088
	server->mount_time = jiffies;
1089
	nfs_free_fattr(fattr);
1090 1091 1092
	return server;

error:
1093
	nfs_free_fattr(fattr);
1094 1095 1096 1097 1098 1099 1100 1101 1102
	nfs_free_server(server);
	return ERR_PTR(error);
}

/*
 * Clone an NFS2, NFS3 or NFS4 server record
 */
struct nfs_server *nfs_clone_server(struct nfs_server *source,
				    struct nfs_fh *fh,
1103 1104
				    struct nfs_fattr *fattr,
				    rpc_authflavor_t flavor)
1105 1106
{
	struct nfs_server *server;
1107
	struct nfs_fattr *fattr_fsinfo;
1108 1109 1110
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1111 1112
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1113 1114 1115 1116 1117

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

1118 1119 1120 1121 1122
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1123 1124
	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
1125
	server->destroy = source->destroy;
1126 1127 1128 1129 1130
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1131 1132
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
1133
			flavor);
1134 1135 1136 1137 1138 1139
	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 */
1140
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1141 1142 1143
	if (error < 0)
		goto out_free_server;

1144 1145 1146
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1147
	dprintk("Cloned FSID: %llx:%llx\n",
1148 1149
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1150 1151 1152 1153 1154

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

1155
	nfs_server_insert_lists(server);
1156 1157
	server->mount_time = jiffies;

1158
	nfs_free_fattr(fattr_fsinfo);
1159 1160 1161 1162
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1163
	nfs_free_fattr(fattr_fsinfo);
1164 1165 1166 1167
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1168

1169 1170 1171 1172 1173
void nfs_clients_init(struct net *net)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	INIT_LIST_HEAD(&nn->nfs_client_list);
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	INIT_LIST_HEAD(&nn->nfs_volume_list);
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#ifdef CONFIG_NFS_V4
	idr_init(&nn->cb_ident_idr);
#endif
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	spin_lock_init(&nn->nfs_client_lock);
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	nn->boot_time = CURRENT_TIME;
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}

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#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);

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static const struct seq_operations nfs_server_list_ops = {
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	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

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static const struct file_operations nfs_server_list_fops = {
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	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
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	.owner		= THIS_MODULE,
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};

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);

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static const struct seq_operations nfs_volume_list_ops = {
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	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

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static const struct file_operations nfs_volume_list_fops = {
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	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
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	.owner		= THIS_MODULE,
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};

/*
 * 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;
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	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
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	ret = seq_open(file, &nfs_server_list_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
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	m->private = net;
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	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)
{
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	struct nfs_net *nn = net_generic(m->private, nfs_net_id);

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	/* lock the list against modification */
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	spin_lock(&nn->nfs_client_lock);
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	return seq_list_start_head(&nn->nfs_client_list, *_pos);
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}

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

	return seq_list_next(v, &nn->nfs_client_list, pos);
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}

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

	spin_unlock(&nn->nfs_client_lock);
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}

/*
 * 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;
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	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1287 1288

	/* display header on line 1 */
1289
	if (v == &nn->nfs_client_list) {
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		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);

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

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	rcu_read_lock();
1302
	seq_printf(m, "v%u %s %s %3d %s\n",
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		   clp->rpc_ops->version,
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		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
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		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);
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	rcu_read_unlock();
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	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;
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	struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
	struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1322 1323 1324 1325 1326 1327

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

	m = file->private_data;
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	m->private = net;
1329 1330 1331 1332 1333 1334 1335 1336 1337

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

1340
	/* lock the list against modification */
1341
	spin_lock(&nn->nfs_client_lock);
1342
	return seq_list_start_head(&nn->nfs_volume_list, *_pos);
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}

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

	return seq_list_next(v, &nn->nfs_volume_list, pos);
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}

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

	spin_unlock(&nn->nfs_client_lock);
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}

/*
 * 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];
1373
	struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1374 1375

	/* display header on line 1 */
1376
	if (v == &nn->nfs_volume_list) {
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		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
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		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",
1388 1389
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1390

1391
	rcu_read_lock();
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	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1393
		   clp->rpc_ops->version,
1394 1395
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1396
		   dev,
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		   fsid,
		   nfs_server_fscache_state(server));
1399
	rcu_read_unlock();
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	return 0;
}

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

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Alexey Dobriyan 已提交
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	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
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	if (!proc_fs_nfs)
		goto error_0;

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

	/* a file of volumes that we have mounted */
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	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1424 1425 1426 1427 1428 1429 1430
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
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	remove_proc_entry("fs/nfsfs", NULL);
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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);
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Alexey Dobriyan 已提交
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	remove_proc_entry("fs/nfsfs", NULL);
1444 1445 1446
}

#endif /* CONFIG_PROC_FS */