client.c 44.1 KB
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/* client.c: NFS client sharing and management code
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


#include <linux/module.h>
#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/metrics.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/xprtrdma.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <linux/inet.h>
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#include <linux/in6.h>
#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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#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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/*
 * 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,
	.pipe_dir_name		= "/nfs",
};

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
	INIT_LIST_HEAD(&clp->cl_delegations);
	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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#endif
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	cred = rpc_lookup_machine_cred();
	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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static void nfs4_shutdown_client(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4
	if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
		nfs4_kill_renewd(clp);
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	BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
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	if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
		nfs_idmap_delete(clp);
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	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
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#endif
}

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/*
 * Destroy the NFS4 callback service
 */
static void nfs4_destroy_callback(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
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		nfs_callback_down(clp->cl_minorversion);
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#endif /* CONFIG_NFS_V4 */
}

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/*
 * Clears/puts all minor version specific parts from an nfs_client struct
 * reverting it to minorversion 0.
 */
static void nfs4_clear_client_minor_version(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
	if (nfs4_has_session(clp)) {
		nfs4_destroy_session(clp->cl_session);
		clp->cl_session = NULL;
	}
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	clp->cl_call_sync = _nfs4_call_sync;
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#endif /* CONFIG_NFS_V4_1 */
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	nfs4_destroy_callback(clp);
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}

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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_clear_client_minor_version(clp);
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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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	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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	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);
		spin_unlock(&nfs_client_lock);

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

		nfs_free_client(clp);
	}
}

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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_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
	    sin1->sin6_scope_id != sin2->sin6_scope_id)
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		return 0;
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	return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
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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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/*
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 * Find a client by IP address and protocol version
 * - returns NULL if no such client
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 */
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struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
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{
	struct nfs_client *clp;

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	spin_lock(&nfs_client_lock);
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	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
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		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

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		/* Don't match clients that failed to initialise properly */
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		if (!(clp->cl_cons_state == NFS_CS_READY ||
		      clp->cl_cons_state == NFS_CS_SESSION_INITING))
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			continue;

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

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		/* Match only the IP address, not the port number */
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		if (!nfs_sockaddr_match_ipaddr(addr, clap))
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			continue;

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

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/*
 * Find a client by IP address and protocol version
 * - returns NULL if no such client
 */
struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
{
	struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
	u32 nfsvers = clp->rpc_ops->version;

	spin_lock(&nfs_client_lock);
	list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
		struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;

		/* Don't match clients that failed to initialise properly */
		if (clp->cl_cons_state != NFS_CS_READY)
			continue;

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

		/* Match only the IP address, not the port number */
		if (!nfs_sockaddr_match_ipaddr(sap, clap))
			continue;

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

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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)
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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);
	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:
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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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static int nfs_create_rpc_client(struct nfs_client *clp,
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				 const struct rpc_timeout *timeparms,
				 rpc_authflavor_t flavor,
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				 int discrtry, int noresvport)
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{
	struct rpc_clnt		*clnt = NULL;
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	struct rpc_create_args args = {
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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 (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		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",
623
				__func__, PTR_ERR(clnt));
624 625 626 627 628 629
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
630 631 632 633 634 635 636

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
	if (!(server->flags & NFS_MOUNT_NONLM))
637
		nlmclnt_done(server->nlm_host);
638 639 640 641 642 643 644
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
645 646
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
647 648 649 650 651 652 653
	struct nlmclnt_initdata nlm_init = {
		.hostname	= clp->cl_hostname,
		.address	= (struct sockaddr *)&clp->cl_addr,
		.addrlen	= clp->cl_addrlen,
		.protocol	= server->flags & NFS_MOUNT_TCP ?
						IPPROTO_TCP : IPPROTO_UDP,
		.nfs_version	= clp->rpc_ops->version,
654 655
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
656
	};
657

658
	if (nlm_init.nfs_version > 3)
659
		return 0;
660
	if (server->flags & NFS_MOUNT_NONLM)
661 662
		return 0;

663
	host = nlmclnt_init(&nlm_init);
664 665 666 667 668 669
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
670 671 672 673 674 675 676 677
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
678
	if (server->nfs_client->rpc_ops->version != 3)
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
		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
 */
705 706 707
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
708 709 710 711 712
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
713
		dprintk("%s: couldn't create rpc_client!\n", __func__);
714 715 716
		return PTR_ERR(server->client);
	}

717 718 719 720 721
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

722 723 724 725 726
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
727
			dprintk("%s: couldn't create credcache!\n", __func__);
728 729 730 731 732 733 734 735 736 737 738 739 740
			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
 */
741
static int nfs_init_client(struct nfs_client *clp,
742
			   const struct rpc_timeout *timeparms,
743
			   const struct nfs_parsed_mount_data *data)
744 745 746 747 748 749 750 751 752 753 754 755 756
{
	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
757 758
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
				      0, data->flags & NFS_MOUNT_NORESVPORT);
759 760 761 762 763 764 765 766 767 768 769 770 771 772
	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
 */
773 774
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
775
{
776 777
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
778
		.addr = (const struct sockaddr *)&data->nfs_server.address,
779
		.addrlen = data->nfs_server.addrlen,
780
		.rpc_ops = &nfs_v2_clientops,
781
		.proto = data->nfs_server.protocol,
782
	};
783
	struct rpc_timeout timeparms;
784
	struct nfs_client *clp;
785
	int error;
786 787 788 789 790

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

#ifdef CONFIG_NFS_V3
	if (data->flags & NFS_MOUNT_VER3)
791
		cl_init.rpc_ops = &nfs_v3_clientops;
792 793 794
#endif

	/* Allocate or find a client reference we can use */
795
	clp = nfs_get_client(&cl_init);
796 797 798 799 800
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

801 802 803
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
804 805 806 807 808 809
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
810
	server->flags = data->flags;
811
	server->options = data->options;
812 813 814
	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;
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830

	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;

831 832
	server->port = data->nfs_server.port;

833
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
834 835 836
	if (error < 0)
		goto error;

837 838 839 840 841 842 843 844 845 846
	/* 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;

847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
	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
 */
static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
{
	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
884

885
	server->backing_dev_info.name = "nfs";
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
	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;
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
	if (server->dtsize > PAGE_CACHE_SIZE)
		server->dtsize = PAGE_CACHE_SIZE;
	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;

	/* 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;
	nfs_fattr_init(fattr);
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

	nfs_server_set_fsinfo(server, &fsinfo);
P
Peter Zijlstra 已提交
936 937 938 939
	error = bdi_init(&server->backing_dev_info);
	if (error)
		goto out_error;

940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989

	/* 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;
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
}

/*
 * 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);

990 991
	atomic_set(&server->active, 0);

992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

	return server;
}

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

	spin_lock(&nfs_client_lock);
	list_del(&server->client_link);
	list_del(&server->master_link);
	spin_unlock(&nfs_client_lock);

	if (server->destroy != NULL)
		server->destroy(server);
1015 1016 1017

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1018 1019 1020 1021 1022 1023
	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
1024
	bdi_destroy(&server->backing_dev_info);
1025 1026 1027 1028 1029 1030 1031 1032 1033
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1034
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
	struct nfs_fattr fattr;
	int error;

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

	/* 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 */
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
	if (error < 0)
		goto error;
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	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;
	}

1068 1069 1070 1071 1072 1073 1074 1075 1076
	if (!(fattr.valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
	memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));

1077 1078 1079
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;
	return server;

error:
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1095 1096 1097 1098 1099 1100 1101 1102
/*
 * 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
1103 1104 1105 1106 1107 1108 1109 1110
		if (nfs4_has_session(clp)) {
			error = xprt_setup_backchannel(
						clp->cl_rpcclient->cl_xprt,
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1111 1112
		error = nfs_callback_up(clp->cl_minorversion,
					clp->cl_rpcclient->cl_xprt);
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
		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;
}

1123 1124 1125 1126 1127
/*
 * Initialize the minor version specific parts of an NFS4 client record
 */
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
A
Andy Adamson 已提交
1128 1129
	clp->cl_call_sync = _nfs4_call_sync;

1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
#if defined(CONFIG_NFS_V4_1)
	if (clp->cl_minorversion) {
		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;
A
Andy Adamson 已提交
1143
		clp->cl_call_sync = _nfs4_call_sync_session;
1144 1145 1146
	}
#endif /* CONFIG_NFS_V4_1 */

1147
	return nfs4_init_callback(clp);
1148 1149
}

1150 1151 1152 1153
/*
 * Initialise an NFS4 client record
 */
static int nfs4_init_client(struct nfs_client *clp,
1154
		const struct rpc_timeout *timeparms,
1155
		const char *ip_addr,
C
Chuck Lever 已提交
1156 1157
		rpc_authflavor_t authflavour,
		int flags)
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
{
	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;

1170
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
C
Chuck Lever 已提交
1171
				      1, flags & NFS_MOUNT_NORESVPORT);
1172 1173
	if (error < 0)
		goto error;
1174
	memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1175 1176 1177 1178

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1179
			__func__, error);
1180 1181
		goto error;
	}
T
Trond Myklebust 已提交
1182
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1183

1184 1185 1186 1187
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1188 1189
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
	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,
1202 1203 1204
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1205
		const char *ip_addr,
1206
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1207 1208
		int proto, const struct rpc_timeout *timeparms,
		u32 minorversion)
1209
{
1210 1211
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1212 1213
		.addr = addr,
		.addrlen = addrlen,
1214
		.rpc_ops = &nfs_v4_clientops,
1215
		.proto = proto,
1216
		.minorversion = minorversion,
1217
	};
1218 1219 1220 1221 1222 1223
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1224
	clp = nfs_get_client(&cl_init);
1225 1226 1227 1228
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
C
Chuck Lever 已提交
1229 1230
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
					server->flags);
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
	if (error < 0)
		goto error_put;

	server->nfs_client = clp;
	dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
	return 0;

error_put:
	nfs_put_client(clp);
error:
	dprintk("<-- nfs4_set_client() = xerror %d\n", error);
	return error;
}

1245

1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
/*
 * 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
	if (!nfs4_has_session(server->nfs_client))
		return;
	server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
	server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz;
#endif /* CONFIG_NFS_V4_1 */
}

1261 1262 1263 1264
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1265
		const struct nfs_parsed_mount_data *data)
1266
{
1267
	struct rpc_timeout timeparms;
1268 1269 1270 1271
	int error;

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

1272 1273 1274
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1275 1276
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
1277
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1278
	server->options = data->options;
1279

1280 1281 1282 1283 1284 1285 1286 1287
	/* 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
1288 1289
			&timeparms,
			data->minorversion);
1290 1291 1292
	if (error < 0)
		goto error;

1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	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;

1303 1304
	server->port = data->nfs_server.port;

1305
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1306

1307
error:
1308 1309 1310 1311 1312 1313 1314 1315 1316
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1317
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
				      struct nfs_fh *mntfh)
{
	struct nfs_fattr fattr;
	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 */
1331
	error = nfs4_init_server(server, data);
1332 1333 1334 1335 1336 1337 1338
	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);

1339 1340 1341
	error = nfs4_init_session(server);
	if (error < 0)
		goto error;
1342

1343
	/* Probe the root fh to retrieve its FSID */
1344
	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1345 1346 1347
	if (error < 0)
		goto error;

1348 1349 1350
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1351 1352
	dprintk("Mount FH: %d\n", mntfh->size);

1353 1354
	nfs4_session_set_rwsize(server);

1355 1356 1357 1358
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
	if (error < 0)
		goto error;

1359 1360 1361
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;
	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,
1381
					       struct nfs_fh *mntfh)
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
{
	struct nfs_client *parent_client;
	struct nfs_server *server, *parent_server;
	struct nfs_fattr fattr;
	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;

1397 1398
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1399
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1400

1401 1402
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1403
	error = nfs4_set_client(server, data->hostname,
1404 1405
				data->addr,
				data->addrlen,
1406 1407 1408
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
B
Benny Halevy 已提交
1409 1410
				parent_server->client->cl_timeout,
				parent_client->cl_minorversion);
1411 1412
	if (error < 0)
		goto error;
1413

1414
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1415 1416 1417 1418 1419 1420 1421
	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);

1422 1423 1424 1425 1426
	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_path_walk(server, mntfh, data->mnt_path);
	if (error < 0)
		goto error;

1427
	/* probe the filesystem info for this server filesystem */
1428
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
1429 1430 1431
	if (error < 0)
		goto error;

1432 1433 1434
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1435
	dprintk("Referral FSID: %llx:%llx\n",
1436 1437
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
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

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;

	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;
	struct nfs_fattr fattr_fsinfo;
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1469 1470
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482

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

	/* Copy data from the source */
	server->nfs_client = source->nfs_client;
	atomic_inc(&server->nfs_client->cl_count);
	nfs_server_copy_userdata(server, source);

	server->fsid = fattr->fsid;

1483 1484 1485
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	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 */
	error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
	if (error < 0)
		goto out_free_server;

1496 1497 1498
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1499
	dprintk("Cloned FSID: %llx:%llx\n",
1500 1501
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521

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

	spin_lock(&nfs_client_lock);
	list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
	list_add_tail(&server->master_link, &nfs_volume_list);
	spin_unlock(&nfs_client_lock);

	server->mount_time = jiffies;

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

out_free_server:
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538

#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);

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

1539
static const struct file_operations nfs_server_list_fops = {
1540 1541 1542 1543
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1544
	.owner		= THIS_MODULE,
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
};

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);

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

1560
static const struct file_operations nfs_volume_list_fops = {
1561 1562 1563 1564
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1565
	.owner		= THIS_MODULE,
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
};

/*
 * 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);
1594
	return seq_list_start_head(&nfs_client_list, *_pos);
1595 1596 1597 1598 1599 1600 1601
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1602
	return seq_list_next(v, &nfs_client_list, pos);
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
}

/*
 * 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 */
1621
	if (v == &nfs_client_list) {
1622 1623 1624 1625 1626 1627 1628
		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);

1629
	seq_printf(m, "v%u %s %s %3d %s\n",
1630
		   clp->rpc_ops->version,
1631 1632
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
		   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);
1664
	return seq_list_start_head(&nfs_volume_list, *_pos);
1665 1666 1667 1668 1669 1670 1671
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1672
	return seq_list_next(v, &nfs_volume_list, pos);
1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
}

/*
 * 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 */
1693
	if (v == &nfs_volume_list) {
D
David Howells 已提交
1694
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
		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",
1705 1706
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1707

D
David Howells 已提交
1708
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1709
		   clp->rpc_ops->version,
1710 1711
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1712
		   dev,
D
David Howells 已提交
1713 1714
		   fsid,
		   nfs_server_fscache_state(server));
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725

	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
1726
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1727 1728 1729 1730
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1731 1732
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1733 1734 1735 1736
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1737 1738
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1739 1740 1741 1742 1743 1744 1745
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1746
	remove_proc_entry("fs/nfsfs", NULL);
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
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
1758
	remove_proc_entry("fs/nfsfs", NULL);
1759 1760 1761
}

#endif /* CONFIG_PROC_FS */