client.c 50.0 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 <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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#define NFSDBG_FACILITY		NFSDBG_CLIENT

static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
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static LIST_HEAD(nfs_volume_list);
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static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
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#ifdef CONFIG_NFS_V4
static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */

/*
 * 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;

	if (clp->rpc_ops->version != 4 || minorversion != 0)
		return ret;
retry:
	if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
		return -ENOMEM;
	spin_lock(&nfs_client_lock);
	ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
	spin_unlock(&nfs_client_lock);
	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
 */
static struct rpc_version *nfs_version[5] = {
	[2]			= &nfs_version2,
#ifdef CONFIG_NFS_V3
	[3]			= &nfs_version3,
#endif
#ifdef CONFIG_NFS_V4
	[4]			= &nfs_version4,
#endif
};

struct rpc_program nfs_program = {
	.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 };
static struct rpc_version *	nfsacl_version[] = {
	[3]			= &nfsacl_version3,
};

struct rpc_program		nfsacl_program = {
	.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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};

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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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#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)
{
	if (nfs4_has_session(clp))
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		nfs4_destroy_session(clp->cl_session);
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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 */
void nfs_cleanup_cb_ident_idr(void)
{
	idr_destroy(&cb_ident_idr);
}

/* nfs_client_lock held */
static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
{
	if (clp->cl_cb_ident)
		idr_remove(&cb_ident_idr, clp->cl_cb_ident);
}

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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(void)
{
}

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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	nfs4_deviceid_purge_client(clp);

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	kfree(clp->cl_hostname);
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	kfree(clp->server_scope);
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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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	if (!clp)
		return;

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	dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));

	if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
		list_del(&clp->cl_share_link);
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		nfs_cb_idr_remove_locked(clp);
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		spin_unlock(&nfs_client_lock);

		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)
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{
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	struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
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	/* Don't match clients that failed to initialise */
	if (!(clp->cl_cons_state == NFS_CS_READY ||
	    clp->cl_cons_state == NFS_CS_SESSION_INITING))
		return false;
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	/* Match the version and minorversion */
	if (clp->rpc_ops->version != 4 ||
	    clp->cl_minorversion != minorversion)
		return false;
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	/* Match only the IP address, not the port number */
	if (!nfs_sockaddr_match_ipaddr(addr, clap))
		return false;
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	return true;
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}

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/*
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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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	list_for_each_entry(clp, &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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}

/*
 * 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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	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 {
		spin_lock(&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;

		spin_unlock(&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;
	list_add(&clp->cl_share_link, &nfs_client_list);
	spin_unlock(&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:
	spin_unlock(&nfs_client_lock);

	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) {
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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:
621 622
		if (to->to_retries == 0)
			to->to_retries = NFS_DEF_UDP_RETRANS;
623
		if (!to->to_initval)
624
			to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
625 626 627 628 629
		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;
630 631
	default:
		BUG();
632 633 634 635 636 637
	}
}

/*
 * Create an RPC client handle
 */
638
static int nfs_create_rpc_client(struct nfs_client *clp,
639 640
				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
641
				 int discrtry, int noresvport)
642 643
{
	struct rpc_clnt		*clnt = NULL;
644
	struct rpc_create_args args = {
645
		.net		= &init_net,
646
		.protocol	= clp->cl_proto,
647
		.address	= (struct sockaddr *)&clp->cl_addr,
648
		.addrsize	= clp->cl_addrlen,
649
		.timeout	= timeparms,
650 651 652 653 654
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
655

656 657 658 659 660
	if (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

661 662 663
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

664
	clnt = rpc_create(&args);
665 666
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
667
				__func__, PTR_ERR(clnt));
668 669 670 671 672 673
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
674 675 676 677 678 679

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
680 681
	if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
			!(server->flags & NFS_MOUNT_LOCAL_FCNTL))
682
		nlmclnt_done(server->nlm_host);
683 684 685 686 687 688 689
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
690 691
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
692 693 694 695 696
	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,
697 698
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
699
	};
700

701
	if (nlm_init.nfs_version > 3)
702
		return 0;
703 704
	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
705 706
		return 0;

707 708 709 710 711 712 713 714
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

715
	host = nlmclnt_init(&nlm_init);
716 717 718 719 720 721
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
722 723 724 725 726 727 728 729
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
730
	if (server->nfs_client->rpc_ops->version != 3)
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
		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
 */
757 758 759
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
760 761 762 763 764
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
765
		dprintk("%s: couldn't create rpc_client!\n", __func__);
766 767 768
		return PTR_ERR(server->client);
	}

769 770 771 772 773
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

774 775 776 777 778
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
779
			dprintk("%s: couldn't create credcache!\n", __func__);
780 781 782 783 784 785 786 787 788 789 790 791 792
			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
 */
793 794 795
int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
		    const char *ip_addr, rpc_authflavor_t authflavour,
		    int noresvport)
796 797 798 799 800 801 802 803 804 805 806 807 808
{
	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
809
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
810
				      0, noresvport);
811 812 813 814 815 816 817 818 819 820 821 822 823 824
	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
 */
825 826
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
827
{
828 829
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
830
		.addr = (const struct sockaddr *)&data->nfs_server.address,
831
		.addrlen = data->nfs_server.addrlen,
832
		.rpc_ops = &nfs_v2_clientops,
833
		.proto = data->nfs_server.protocol,
834
	};
835
	struct rpc_timeout timeparms;
836
	struct nfs_client *clp;
837
	int error;
838 839 840 841

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

#ifdef CONFIG_NFS_V3
842
	if (data->version == 3)
843
		cl_init.rpc_ops = &nfs_v3_clientops;
844 845
#endif

846 847 848
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

849
	/* Allocate or find a client reference we can use */
850 851
	clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX,
			     data->flags & NFS_MOUNT_NORESVPORT);
852 853 854 855 856 857 858 859
	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 */
860
	server->flags = data->flags;
861
	server->options = data->options;
862 863 864
	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;
865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880

	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;

881 882
	server->port = data->nfs_server.port;

883
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
884 885 886
	if (error < 0)
		goto error;

887 888 889 890 891 892 893 894 895 896
	/* 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;

897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912
	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
 */
913 914 915
static void nfs_server_set_fsinfo(struct nfs_server *server,
				  struct nfs_fh *mntfh,
				  struct nfs_fsinfo *fsinfo)
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
{
	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
936

937
	server->backing_dev_info.name = "nfs";
938 939 940 941 942 943 944
	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;
945
	server->pnfs_blksize = fsinfo->blksize;
946
	set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
R
Ricardo Labiaga 已提交
947

948 949 950
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
951 952
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
953 954 955 956 957 958 959 960 961 962
	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
963 964
	server->time_delta = fsinfo->time_delta;

965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
	/* 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
987
	fsinfo.layouttype = 0;
988 989 990 991
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

992
	nfs_server_set_fsinfo(server, mntfh, &fsinfo);
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018

	/* 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;
1019 1020
	target->rsize = source->rsize;
	target->wsize = source->wsize;
1021 1022 1023 1024 1025
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
1026
	target->options = source->options;
1027 1028
}

1029 1030 1031 1032 1033 1034 1035
static void nfs_server_insert_lists(struct nfs_server *server)
{
	struct nfs_client *clp = server->nfs_client;

	spin_lock(&nfs_client_lock);
	list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
1036
	clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1037 1038 1039 1040 1041 1042
	spin_unlock(&nfs_client_lock);

}

static void nfs_server_remove_lists(struct nfs_server *server)
{
1043 1044
	struct nfs_client *clp = server->nfs_client;

1045 1046
	spin_lock(&nfs_client_lock);
	list_del_rcu(&server->client_link);
1047 1048
	if (clp && list_empty(&clp->cl_superblocks))
		set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1049 1050 1051 1052 1053 1054
	list_del(&server->master_link);
	spin_unlock(&nfs_client_lock);

	synchronize_rcu();
}

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
/*
 * 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);
1071
	INIT_LIST_HEAD(&server->delegations);
1072
	INIT_LIST_HEAD(&server->layouts);
1073
	INIT_LIST_HEAD(&server->state_owners_lru);
1074

1075 1076
	atomic_set(&server->active, 0);

1077 1078 1079 1080 1081 1082
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

1083 1084 1085 1086 1087 1088
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

F
Fred Isaman 已提交
1089 1090
	pnfs_init_server(server);

1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
	return server;
}

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

1101
	nfs_server_remove_lists(server);
R
Ricardo Labiaga 已提交
1102
	unset_pnfs_layoutdriver(server);
1103 1104 1105

	if (server->destroy != NULL)
		server->destroy(server);
1106 1107 1108

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1109 1110 1111 1112 1113 1114
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

	nfs_free_iostats(server->io_stats);
P
Peter Zijlstra 已提交
1115
	bdi_destroy(&server->backing_dev_info);
1116 1117 1118 1119 1120 1121 1122 1123 1124
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1125
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1126 1127 1128
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1129
	struct nfs_fattr *fattr;
1130 1131 1132 1133 1134 1135
	int error;

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

1136 1137 1138 1139 1140
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
	/* 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 */
1151
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1152 1153
	if (error < 0)
		goto error;
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	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;
	}

1164 1165
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1166 1167 1168 1169 1170
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1171
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1172

1173 1174 1175
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1176

1177
	nfs_server_insert_lists(server);
1178
	server->mount_time = jiffies;
1179
	nfs_free_fattr(fattr);
1180 1181 1182
	return server;

error:
1183
	nfs_free_fattr(fattr);
1184 1185 1186 1187 1188
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
/*
 * NFSv4.0 callback thread helper
 *
 * Find a client by IP address, protocol version, and minorversion
 *
 * Called from the pg_authenticate method. The callback identifier
 * is not used as it has not been decoded.
 *
 * Returns NULL if no such client
 */
struct nfs_client *
nfs4_find_client_no_ident(const struct sockaddr *addr)
{
	struct nfs_client *clp;

	spin_lock(&nfs_client_lock);
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
		if (nfs4_cb_match_client(addr, clp, 0) == false)
			continue;
		atomic_inc(&clp->cl_count);
		spin_unlock(&nfs_client_lock);
		return clp;
	}
	spin_unlock(&nfs_client_lock);
	return NULL;
}

/*
 * NFSv4.0 callback thread helper
 *
 * Find a client by callback identifier
 */
struct nfs_client *
nfs4_find_client_ident(int cb_ident)
{
	struct nfs_client *clp;

	spin_lock(&nfs_client_lock);
	clp = idr_find(&cb_ident_idr, cb_ident);
	if (clp)
		atomic_inc(&clp->cl_count);
	spin_unlock(&nfs_client_lock);
	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 *
nfs4_find_client_sessionid(const struct sockaddr *addr,
1244
			   struct nfs4_sessionid *sid)
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
{
	struct nfs_client *clp;

	spin_lock(&nfs_client_lock);
	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
		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 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
			continue;

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

#else /* CONFIG_NFS_V4_1 */

struct nfs_client *
nfs4_find_client_sessionid(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) {
A
Andy Adamson 已提交
1287 1288 1289 1290 1291 1292 1293 1294
		if (nfs4_has_session(clp)) {
			error = xprt_setup_backchannel(
						clp->cl_rpcclient->cl_xprt,
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1295
		error = nfs_callback_up(clp->cl_mvops->minor_version,
1296
					clp->cl_rpcclient->cl_xprt);
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
		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;
}

1307 1308 1309 1310 1311 1312
/*
 * 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)
1313
	if (clp->cl_mvops->minor_version) {
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
		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;
1325 1326 1327 1328 1329 1330 1331
		/*
		 * 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;
1332 1333 1334
	}
#endif /* CONFIG_NFS_V4_1 */

1335
	return nfs4_init_callback(clp);
1336 1337
}

1338 1339 1340
/*
 * Initialise an NFS4 client record
 */
1341 1342 1343 1344 1345
int nfs4_init_client(struct nfs_client *clp,
		     const struct rpc_timeout *timeparms,
		     const char *ip_addr,
		     rpc_authflavor_t authflavour,
		     int noresvport)
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
{
	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;

1358
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
1359
				      1, noresvport);
1360 1361
	if (error < 0)
		goto error;
1362
	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1363 1364 1365 1366

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1367
			__func__, error);
1368 1369
		goto error;
	}
T
Trond Myklebust 已提交
1370
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1371

1372 1373 1374 1375
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1376 1377
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
	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,
1390 1391 1392
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1393
		const char *ip_addr,
1394
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1395 1396
		int proto, const struct rpc_timeout *timeparms,
		u32 minorversion)
1397
{
1398 1399
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1400 1401
		.addr = addr,
		.addrlen = addrlen,
1402
		.rpc_ops = &nfs_v4_clientops,
1403
		.proto = proto,
1404
		.minorversion = minorversion,
1405
	};
1406 1407 1408 1409 1410 1411
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1412 1413
	clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour,
			     server->flags & NFS_MOUNT_NORESVPORT);
1414 1415 1416 1417 1418
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}

1419 1420 1421 1422 1423 1424 1425 1426 1427
	/*
	 * 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);

1428 1429 1430 1431 1432 1433 1434 1435
	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
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
/*
 * 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,
	};
	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;
}
1476
EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1477

1478 1479 1480 1481 1482 1483 1484 1485
/*
 * 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
1486 1487 1488 1489
	struct nfs4_session *sess;
	u32 server_resp_sz;
	u32 server_rqst_sz;

1490 1491
	if (!nfs4_has_session(server->nfs_client))
		return;
1492 1493 1494 1495 1496 1497 1498 1499
	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;
1500 1501 1502
#endif /* CONFIG_NFS_V4_1 */
}

1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
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);

1513 1514 1515 1516
	/* data servers support only a subset of NFSv4.1 */
	if (is_ds_only_client(server->nfs_client))
		return -EPROTONOSUPPORT;

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
	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;

1545
	nfs_server_insert_lists(server);
1546
	server->mount_time = jiffies;
1547
	server->destroy = nfs4_destroy_server;
1548 1549 1550 1551 1552
out:
	nfs_free_fattr(fattr);
	return error;
}

1553 1554 1555 1556
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1557
		const struct nfs_parsed_mount_data *data)
1558
{
1559
	struct rpc_timeout timeparms;
1560 1561 1562 1563
	int error;

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

1564 1565 1566
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1567 1568
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
B
Bryan Schumaker 已提交
1569 1570 1571
	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;
1572
	server->options = data->options;
1573

1574 1575 1576 1577 1578 1579 1580 1581
	/* 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
1582 1583
			&timeparms,
			data->minorversion);
1584 1585 1586
	if (error < 0)
		goto error;

1587 1588 1589 1590 1591 1592 1593
	/*
	 * 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;

1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
	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;

1604 1605
	server->port = data->nfs_server.port;

1606
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1607

1608
error:
1609 1610 1611 1612 1613 1614 1615 1616 1617
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1618
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630
				      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 */
1631
	error = nfs4_init_server(server, data);
1632 1633 1634
	if (error < 0)
		goto error;

1635
	error = nfs4_server_common_setup(server, mntfh);
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	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,
1652
					       struct nfs_fh *mntfh)
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
{
	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;

1667 1668
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1669
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1670

1671 1672
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1673
	error = nfs4_set_client(server, data->hostname,
1674 1675
				data->addr,
				data->addrlen,
1676 1677 1678
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
B
Benny Halevy 已提交
1679
				parent_server->client->cl_timeout,
1680
				parent_client->cl_mvops->minor_version);
1681 1682
	if (error < 0)
		goto error;
1683

1684
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1685 1686 1687
	if (error < 0)
		goto error;

1688
	error = nfs4_server_common_setup(server, mntfh);
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
	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;
1711
	struct nfs_fattr *fattr_fsinfo;
1712 1713 1714
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1715 1716
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1717 1718 1719 1720 1721

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

1722 1723 1724 1725 1726
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1727 1728
	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
1729
	server->destroy = source->destroy;
1730 1731 1732 1733 1734
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1735 1736 1737
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1738 1739 1740 1741 1742 1743
	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 */
1744
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1745 1746 1747
	if (error < 0)
		goto out_free_server;

1748 1749 1750
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1751
	dprintk("Cloned FSID: %llx:%llx\n",
1752 1753
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1754 1755 1756 1757 1758

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

1759
	nfs_server_insert_lists(server);
1760 1761
	server->mount_time = jiffies;

1762
	nfs_free_fattr(fattr_fsinfo);
1763 1764 1765 1766
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1767
	nfs_free_fattr(fattr_fsinfo);
1768 1769 1770 1771
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781

#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
1782
static const struct seq_operations nfs_server_list_ops = {
1783 1784 1785 1786 1787 1788
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1789
static const struct file_operations nfs_server_list_fops = {
1790 1791 1792 1793
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1794
	.owner		= THIS_MODULE,
1795 1796 1797 1798 1799 1800 1801 1802
};

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
1803
static const struct seq_operations nfs_volume_list_ops = {
1804 1805 1806 1807 1808 1809
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1810
static const struct file_operations nfs_volume_list_fops = {
1811 1812 1813 1814
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1815
	.owner		= THIS_MODULE,
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 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;

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

	m = file->private_data;
	m->private = PDE(inode)->data;

	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)
{
	/* lock the list against modification */
	spin_lock(&nfs_client_lock);
1844
	return seq_list_start_head(&nfs_client_list, *_pos);
1845 1846 1847 1848 1849 1850 1851
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1852
	return seq_list_next(v, &nfs_client_list, pos);
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
	spin_unlock(&nfs_client_lock);
}

/*
 * 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;

	/* display header on line 1 */
1871
	if (v == &nfs_client_list) {
1872 1873 1874 1875 1876 1877 1878
		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);

1879 1880 1881 1882
	/* Check if the client is initialized */
	if (clp->cl_cons_state != NFS_CS_READY)
		return 0;

1883
	seq_printf(m, "v%u %s %s %3d %s\n",
1884
		   clp->rpc_ops->version,
1885 1886
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);

	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;

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

	m = file->private_data;
	m->private = PDE(inode)->data;

	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)
{
	/* lock the list against modification */
	spin_lock(&nfs_client_lock);
1918
	return seq_list_start_head(&nfs_volume_list, *_pos);
1919 1920 1921 1922 1923 1924 1925
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1926
	return seq_list_next(v, &nfs_volume_list, pos);
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
	spin_unlock(&nfs_client_lock);
}

/*
 * 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];

	/* display header on line 1 */
1947
	if (v == &nfs_volume_list) {
D
David Howells 已提交
1948
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
		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",
1959 1960
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1961

D
David Howells 已提交
1962
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1963
		   clp->rpc_ops->version,
1964 1965
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1966
		   dev,
D
David Howells 已提交
1967 1968
		   fsid,
		   nfs_server_fscache_state(server));
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979

	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
1980
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1981 1982 1983 1984
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1985 1986
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1987 1988 1989 1990
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1991 1992
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1993 1994 1995 1996 1997 1998 1999
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
2000
	remove_proc_entry("fs/nfsfs", NULL);
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
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
2012
	remove_proc_entry("fs/nfsfs", NULL);
2013 2014 2015
}

#endif /* CONFIG_PROC_FS */
2016 2017 2018 2019

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