client.c 47.6 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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/*
 * 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
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	err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
	if (err)
		goto error_cleanup;

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	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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	clp->cl_mvops = nfs_v4_minor_ops[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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#if defined(CONFIG_NFS_V4_1)
	INIT_LIST_HEAD(&clp->cl_layouts);
#endif
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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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#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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	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);
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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_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, &sin2->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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/* 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)
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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,
619
				 int discrtry, int noresvport)
620 621
{
	struct rpc_clnt		*clnt = NULL;
622
	struct rpc_create_args args = {
623
		.net		= &init_net,
624
		.protocol	= clp->cl_proto,
625
		.address	= (struct sockaddr *)&clp->cl_addr,
626
		.addrsize	= clp->cl_addrlen,
627
		.timeout	= timeparms,
628 629 630 631 632
		.servername	= clp->cl_hostname,
		.program	= &nfs_program,
		.version	= clp->rpc_ops->version,
		.authflavor	= flavor,
	};
633

634 635 636 637 638
	if (discrtry)
		args.flags |= RPC_CLNT_CREATE_DISCRTRY;
	if (noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

639 640 641
	if (!IS_ERR(clp->cl_rpcclient))
		return 0;

642
	clnt = rpc_create(&args);
643 644
	if (IS_ERR(clnt)) {
		dprintk("%s: cannot create RPC client. Error = %ld\n",
645
				__func__, PTR_ERR(clnt));
646 647 648 649 650 651
		return PTR_ERR(clnt);
	}

	clp->cl_rpcclient = clnt;
	return 0;
}
652 653 654 655 656 657

/*
 * Version 2 or 3 client destruction
 */
static void nfs_destroy_server(struct nfs_server *server)
{
658 659
	if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
			!(server->flags & NFS_MOUNT_LOCAL_FCNTL))
660
		nlmclnt_done(server->nlm_host);
661 662 663 664 665 666 667
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
668 669
	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
670 671 672 673 674
	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,
675 676
		.noresvport	= server->flags & NFS_MOUNT_NORESVPORT ?
					1 : 0,
677
	};
678

679
	if (nlm_init.nfs_version > 3)
680
		return 0;
681 682
	if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
			(server->flags & NFS_MOUNT_LOCAL_FCNTL))
683 684
		return 0;

685 686 687 688 689 690 691 692
	switch (clp->cl_proto) {
		default:
			nlm_init.protocol = IPPROTO_TCP;
			break;
		case XPRT_TRANSPORT_UDP:
			nlm_init.protocol = IPPROTO_UDP;
	}

693
	host = nlmclnt_init(&nlm_init);
694 695 696 697 698 699
	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
700 701 702 703 704 705 706 707
}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
708
	if (server->nfs_client->rpc_ops->version != 3)
709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
		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
 */
735 736 737
static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
738 739 740 741 742
{
	struct nfs_client *clp = server->nfs_client;

	server->client = rpc_clone_client(clp->cl_rpcclient);
	if (IS_ERR(server->client)) {
743
		dprintk("%s: couldn't create rpc_client!\n", __func__);
744 745 746
		return PTR_ERR(server->client);
	}

747 748 749 750 751
	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

752 753 754 755 756
	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
757
			dprintk("%s: couldn't create credcache!\n", __func__);
758 759 760 761 762 763 764 765 766 767 768 769 770
			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
 */
771
static int nfs_init_client(struct nfs_client *clp,
772
			   const struct rpc_timeout *timeparms,
773
			   const struct nfs_parsed_mount_data *data)
774 775 776 777 778 779 780 781 782 783 784 785 786
{
	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
787 788
	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
				      0, data->flags & NFS_MOUNT_NORESVPORT);
789 790 791 792 793 794 795 796 797 798 799 800 801 802
	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
 */
803 804
static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
805
{
806 807
	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
808
		.addr = (const struct sockaddr *)&data->nfs_server.address,
809
		.addrlen = data->nfs_server.addrlen,
810
		.rpc_ops = &nfs_v2_clientops,
811
		.proto = data->nfs_server.protocol,
812
	};
813
	struct rpc_timeout timeparms;
814
	struct nfs_client *clp;
815
	int error;
816 817 818 819

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

#ifdef CONFIG_NFS_V3
820
	if (data->version == 3)
821
		cl_init.rpc_ops = &nfs_v3_clientops;
822 823 824
#endif

	/* Allocate or find a client reference we can use */
825
	clp = nfs_get_client(&cl_init);
826 827 828 829 830
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

831 832 833
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
834 835 836 837 838 839
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
840
	server->flags = data->flags;
841
	server->options = data->options;
842 843 844
	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;
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860

	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;

861 862
	server->port = data->nfs_server.port;

863
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
864 865 866
	if (error < 0)
		goto error;

867 868 869 870 871 872 873 874 875 876
	/* 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;

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
	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
914

915
	server->backing_dev_info.name = "nfs";
916 917 918 919 920 921 922
	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;
R
Ricardo Labiaga 已提交
923 924
	set_pnfs_layoutdriver(server, fsinfo->layouttype);

925 926 927
	server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
B
Bryan Schumaker 已提交
928 929
	if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
		server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
930 931 932 933 934 935 936 937 938 939
	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
940 941
	server->time_delta = fsinfo->time_delta;

942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
	/* 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
964
	fsinfo.layouttype = 0;
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
	error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
	if (error < 0)
		goto out_error;

	nfs_server_set_fsinfo(server, &fsinfo);

	/* 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;
996 997
	target->rsize = source->rsize;
	target->wsize = source->wsize;
998 999 1000 1001 1002
	target->acregmin = source->acregmin;
	target->acregmax = source->acregmax;
	target->acdirmin = source->acdirmin;
	target->acdirmax = source->acdirmax;
	target->caps = source->caps;
1003
	target->options = source->options;
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
}

/*
 * 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);

1023 1024
	atomic_set(&server->active, 0);

1025 1026 1027 1028 1029 1030
	server->io_stats = nfs_alloc_iostats();
	if (!server->io_stats) {
		kfree(server);
		return NULL;
	}

1031 1032 1033 1034 1035 1036
	if (bdi_init(&server->backing_dev_info)) {
		nfs_free_iostats(server->io_stats);
		kfree(server);
		return NULL;
	}

F
Fred Isaman 已提交
1037 1038
	pnfs_init_server(server);

1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	return server;
}

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

R
Ricardo Labiaga 已提交
1049
	unset_pnfs_layoutdriver(server);
1050 1051 1052 1053 1054 1055 1056
	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);
1057 1058 1059

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
1060 1061 1062 1063 1064 1065
	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
1066
	bdi_destroy(&server->backing_dev_info);
1067 1068 1069 1070 1071 1072 1073 1074 1075
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
1076
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1077 1078 1079
				     struct nfs_fh *mntfh)
{
	struct nfs_server *server;
1080
	struct nfs_fattr *fattr;
1081 1082 1083 1084 1085 1086
	int error;

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

1087 1088 1089 1090 1091
	error = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto error;

1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
	/* 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 */
1102
	error = nfs_probe_fsinfo(server, mntfh, fattr);
1103 1104
	if (error < 0)
		goto error;
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
	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;
	}

1115 1116
	if (!(fattr->valid & NFS_ATTR_FATTR)) {
		error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1117 1118 1119 1120 1121
		if (error < 0) {
			dprintk("nfs_create_server: getattr error = %d\n", -error);
			goto error;
		}
	}
1122
	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1123

1124 1125 1126
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1127 1128 1129 1130 1131 1132 1133

	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;
1134
	nfs_free_fattr(fattr);
1135 1136 1137
	return server;

error:
1138
	nfs_free_fattr(fattr);
1139 1140 1141 1142 1143
	nfs_free_server(server);
	return ERR_PTR(error);
}

#ifdef CONFIG_NFS_V4
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 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
/*
 * 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
 *
 * CREATE_SESSION triggers a CB_NULL ping from servers. The callback service
 * sessionid can only be set after the CREATE_SESSION return, so a CB_NULL
 * can arrive before the callback sessionid is set. For CB_NULL calls,
 * find a client by IP address protocol version, and minorversion.
 *
 * Returns NULL if no such client
 */
struct nfs_client *
nfs4_find_client_sessionid(const struct sockaddr *addr,
			   struct nfs4_sessionid *sid, int is_cb_compound)
{
	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;

		/* Match sessionid unless cb_null call*/
		if (is_cb_compound && (memcmp(clp->cl_session->sess_id.data,
		    sid->data, NFS4_MAX_SESSIONID_LEN) != 0))
			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,
			   struct nfs4_sessionid *sid, int is_cb_compound)
{
	return NULL;
}
#endif /* CONFIG_NFS_V4_1 */

1239 1240 1241 1242 1243 1244 1245 1246
/*
 * 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
1247 1248 1249 1250 1251 1252 1253 1254
		if (nfs4_has_session(clp)) {
			error = xprt_setup_backchannel(
						clp->cl_rpcclient->cl_xprt,
						NFS41_BC_MIN_CALLBACKS);
			if (error < 0)
				return error;
		}

1255
		error = nfs_callback_up(clp->cl_mvops->minor_version,
1256
					clp->cl_rpcclient->cl_xprt);
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
		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;
}

1267 1268 1269 1270 1271 1272
/*
 * 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)
1273
	if (clp->cl_mvops->minor_version) {
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
		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;
1285 1286 1287 1288 1289 1290 1291
		/*
		 * 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;
1292 1293 1294
	}
#endif /* CONFIG_NFS_V4_1 */

1295
	return nfs4_init_callback(clp);
1296 1297
}

1298 1299 1300 1301
/*
 * Initialise an NFS4 client record
 */
static int nfs4_init_client(struct nfs_client *clp,
1302
		const struct rpc_timeout *timeparms,
1303
		const char *ip_addr,
C
Chuck Lever 已提交
1304 1305
		rpc_authflavor_t authflavour,
		int flags)
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
{
	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;

1318
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
C
Chuck Lever 已提交
1319
				      1, flags & NFS_MOUNT_NORESVPORT);
1320 1321
	if (error < 0)
		goto error;
1322
	strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1323 1324 1325 1326

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
1327
			__func__, error);
1328 1329
		goto error;
	}
T
Trond Myklebust 已提交
1330
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1331

1332 1333 1334 1335
	error = nfs4_init_client_minor_version(clp);
	if (error < 0)
		goto error;

1336 1337
	if (!nfs4_has_session(clp))
		nfs_mark_client_ready(clp, NFS_CS_READY);
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
	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,
1350 1351 1352
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1353
		const char *ip_addr,
1354
		rpc_authflavor_t authflavour,
B
Benny Halevy 已提交
1355 1356
		int proto, const struct rpc_timeout *timeparms,
		u32 minorversion)
1357
{
1358 1359
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1360 1361
		.addr = addr,
		.addrlen = addrlen,
1362
		.rpc_ops = &nfs_v4_clientops,
1363
		.proto = proto,
1364
		.minorversion = minorversion,
1365
	};
1366 1367 1368 1369 1370 1371
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1372
	clp = nfs_get_client(&cl_init);
1373 1374 1375 1376
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
C
Chuck Lever 已提交
1377 1378
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
					server->flags);
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392
	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;
}

1393

1394 1395 1396 1397 1398 1399 1400 1401
/*
 * 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
1402 1403 1404 1405
	struct nfs4_session *sess;
	u32 server_resp_sz;
	u32 server_rqst_sz;

1406 1407
	if (!nfs4_has_session(server->nfs_client))
		return;
1408 1409 1410 1411 1412 1413 1414 1415
	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;
1416 1417 1418
#endif /* CONFIG_NFS_V4_1 */
}

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 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
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);

	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;

	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;
out:
	nfs_free_fattr(fattr);
	return error;
}

1468 1469 1470 1471
/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1472
		const struct nfs_parsed_mount_data *data)
1473
{
1474
	struct rpc_timeout timeparms;
1475 1476 1477 1478
	int error;

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

1479 1480 1481
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

1482 1483
	/* Initialise the client representation from the mount data */
	server->flags = data->flags;
B
Bryan Schumaker 已提交
1484 1485 1486
	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;
1487
	server->options = data->options;
1488

1489 1490 1491 1492 1493 1494 1495 1496
	/* 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
1497 1498
			&timeparms,
			data->minorversion);
1499 1500 1501
	if (error < 0)
		goto error;

1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
	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;

1512 1513
	server->port = data->nfs_server.port;

1514
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1515

1516
error:
1517 1518 1519 1520 1521 1522 1523 1524 1525
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1526
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
				      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 */
1539
	error = nfs4_init_server(server, data);
1540 1541 1542
	if (error < 0)
		goto error;

1543
	error = nfs4_server_common_setup(server, mntfh);
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
	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,
1560
					       struct nfs_fh *mntfh)
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
{
	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;

1575 1576
	/* Initialise the client representation from the parent server */
	nfs_server_copy_userdata(server, parent_server);
1577
	server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1578

1579 1580
	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1581
	error = nfs4_set_client(server, data->hostname,
1582 1583
				data->addr,
				data->addrlen,
1584 1585 1586
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
B
Benny Halevy 已提交
1587
				parent_server->client->cl_timeout,
1588
				parent_client->cl_mvops->minor_version);
1589 1590
	if (error < 0)
		goto error;
1591

1592
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1593 1594 1595
	if (error < 0)
		goto error;

1596
	error = nfs4_server_common_setup(server, mntfh);
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
	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;
1619
	struct nfs_fattr *fattr_fsinfo;
1620 1621 1622
	int error;

	dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1623 1624
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1625 1626 1627 1628 1629

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

1630 1631 1632 1633 1634
	error = -ENOMEM;
	fattr_fsinfo = nfs_alloc_fattr();
	if (fattr_fsinfo == NULL)
		goto out_free_server;

1635 1636 1637 1638 1639 1640 1641
	/* 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;

1642 1643 1644
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1645 1646 1647 1648 1649 1650
	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 */
1651
	error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1652 1653 1654
	if (error < 0)
		goto out_free_server;

1655 1656 1657
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1658
	dprintk("Cloned FSID: %llx:%llx\n",
1659 1660
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672

	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;

1673
	nfs_free_fattr(fattr_fsinfo);
1674 1675 1676 1677
	dprintk("<-- nfs_clone_server() = %p\n", server);
	return server;

out_free_server:
1678
	nfs_free_fattr(fattr_fsinfo);
1679 1680 1681 1682
	nfs_free_server(server);
	dprintk("<-- nfs_clone_server() = error %d\n", error);
	return ERR_PTR(error);
}
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692

#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
1693
static const struct seq_operations nfs_server_list_ops = {
1694 1695 1696 1697 1698 1699
	.start	= nfs_server_list_start,
	.next	= nfs_server_list_next,
	.stop	= nfs_server_list_stop,
	.show	= nfs_server_list_show,
};

1700
static const struct file_operations nfs_server_list_fops = {
1701 1702 1703 1704
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1705
	.owner		= THIS_MODULE,
1706 1707 1708 1709 1710 1711 1712 1713
};

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
1714
static const struct seq_operations nfs_volume_list_ops = {
1715 1716 1717 1718 1719 1720
	.start	= nfs_volume_list_start,
	.next	= nfs_volume_list_next,
	.stop	= nfs_volume_list_stop,
	.show	= nfs_volume_list_show,
};

1721
static const struct file_operations nfs_volume_list_fops = {
1722 1723 1724 1725
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
1726
	.owner		= THIS_MODULE,
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
};

/*
 * 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);
1755
	return seq_list_start_head(&nfs_client_list, *_pos);
1756 1757 1758 1759 1760 1761 1762
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1763
	return seq_list_next(v, &nfs_client_list, pos);
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
}

/*
 * 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 */
1782
	if (v == &nfs_client_list) {
1783 1784 1785 1786 1787 1788 1789
		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);

1790
	seq_printf(m, "v%u %s %s %3d %s\n",
1791
		   clp->rpc_ops->version,
1792 1793
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824
		   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);
1825
	return seq_list_start_head(&nfs_volume_list, *_pos);
1826 1827 1828 1829 1830 1831 1832
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1833
	return seq_list_next(v, &nfs_volume_list, pos);
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
}

/*
 * 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 */
1854
	if (v == &nfs_volume_list) {
D
David Howells 已提交
1855
		seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
		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",
1866 1867
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1868

D
David Howells 已提交
1869
	seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1870
		   clp->rpc_ops->version,
1871 1872
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1873
		   dev,
D
David Howells 已提交
1874 1875
		   fsid,
		   nfs_server_fscache_state(server));
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886

	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
1887
	proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1888 1889 1890 1891
	if (!proc_fs_nfs)
		goto error_0;

	/* a file of servers with which we're dealing */
1892 1893
	p = proc_create("servers", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_server_list_fops);
1894 1895 1896 1897
	if (!p)
		goto error_1;

	/* a file of volumes that we have mounted */
1898 1899
	p = proc_create("volumes", S_IFREG|S_IRUGO,
			proc_fs_nfs, &nfs_volume_list_fops);
1900 1901 1902 1903 1904 1905 1906
	if (!p)
		goto error_2;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
A
Alexey Dobriyan 已提交
1907
	remove_proc_entry("fs/nfsfs", NULL);
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
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
1919
	remove_proc_entry("fs/nfsfs", NULL);
1920 1921 1922
}

#endif /* CONFIG_PROC_FS */