client.c 37.9 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>

#include <asm/system.h>

#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"

#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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};

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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;

	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
		goto error_0;

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	clp->rpc_ops = cl_init->rpc_ops;

	if (cl_init->rpc_ops->version == 4) {
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		if (nfs_callback_up() < 0)
			goto error_2;
		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
	}

	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) {
		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
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		if (!clp->cl_hostname)
			goto error_3;
	}

	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_rwsem(&clp->cl_sem);
	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;
#endif

	return clp;

error_3:
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	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
		nfs_callback_down();
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error_2:
	kfree(clp);
error_0:
	return NULL;
}

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

	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
		nfs_callback_down();

	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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static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
				 const struct sockaddr_in *sa2)
{
	return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
}

static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
				 const struct sockaddr_in6 *sa2)
{
	return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
}

static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
				 const struct sockaddr *sa2)
{
	switch (sa1->sa_family) {
	case AF_INET:
		return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
				(const struct sockaddr_in *)sa2);
	case AF_INET6:
		return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
				(const struct sockaddr_in6 *)sa2);
	}
	BUG();
}

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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)
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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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		if (addr->sa_family != clap->sa_family)
			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;

		if (sap->sa_family != clap->sa_family)
			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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	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
		/* 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 the full socket address */
		if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
			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 (new);

	return ERR_PTR(-ENOMEM);

	/* 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);
	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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static 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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/*
 * 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;
	if (!to->to_retries)
		to->to_retries = 2;

	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_initval == 0)
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			to->to_initval = 60 * HZ;
		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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	default:
		if (!to->to_initval)
			to->to_initval = 11 * HZ / 10;
		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;
	}
}

/*
 * 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,
				 int flags)
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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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		.flags		= flags,
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	};
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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",
				__FUNCTION__, PTR_ERR(clnt));
		return PTR_ERR(clnt);
	}

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

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
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	struct nlm_host *host;
	struct nfs_client *clp = server->nfs_client;
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	struct nlmclnt_initdata nlm_init = {
		.hostname	= clp->cl_hostname,
		.address	= (struct sockaddr *)&clp->cl_addr,
		.addrlen	= clp->cl_addrlen,
		.protocol	= server->flags & NFS_MOUNT_TCP ?
						IPPROTO_TCP : IPPROTO_UDP,
		.nfs_version	= clp->rpc_ops->version,
	};
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	if (nlm_init.nfs_version > 3)
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		return 0;
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	if (server->flags & NFS_MOUNT_NONLM)
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		return 0;

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	host = nlmclnt_init(&nlm_init);
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	if (IS_ERR(host))
		return PTR_ERR(host);

	server->nlm_host = host;
	server->destroy = nfs_destroy_server;
	return 0;
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}

/*
 * Initialise an NFSv3 ACL client connection
 */
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
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	if (server->nfs_client->rpc_ops->version != 3)
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		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
 */
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static int nfs_init_server_rpcclient(struct nfs_server *server,
		const struct rpc_timeout *timeo,
		rpc_authflavor_t pseudoflavour)
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{
	struct nfs_client *clp = server->nfs_client;

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

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	memcpy(&server->client->cl_timeout_default,
			timeo,
			sizeof(server->client->cl_timeout_default));
	server->client->cl_timeout = &server->client->cl_timeout_default;

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	if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
		struct rpc_auth *auth;

		auth = rpcauth_create(pseudoflavour, server->client);
		if (IS_ERR(auth)) {
			dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
			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
 */
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static int nfs_init_client(struct nfs_client *clp,
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			   const struct rpc_timeout *timeparms,
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			   const struct nfs_parsed_mount_data *data)
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{
	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
	 */
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	error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
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	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
 */
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static int nfs_init_server(struct nfs_server *server,
			   const struct nfs_parsed_mount_data *data)
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{
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	struct nfs_client_initdata cl_init = {
		.hostname = data->nfs_server.hostname,
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		.addr = (const struct sockaddr *)&data->nfs_server.address,
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		.addrlen = data->nfs_server.addrlen,
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		.rpc_ops = &nfs_v2_clientops,
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		.proto = data->nfs_server.protocol,
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	};
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	struct rpc_timeout timeparms;
642
	struct nfs_client *clp;
643
	int error;
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	dprintk("--> nfs_init_server()\n");

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

	/* Allocate or find a client reference we can use */
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	clp = nfs_get_client(&cl_init);
654 655 656 657 658
	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

659 660 661
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);
	error = nfs_init_client(clp, &timeparms, data);
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684
	if (error < 0)
		goto error;

	server->nfs_client = clp;

	/* Initialise the client representation from the mount data */
	server->flags = data->flags & NFS_MOUNT_FLAGMASK;

	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;

685 686
	server->port = data->nfs_server.port;

687
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
688 689 690
	if (error < 0)
		goto error;

691 692 693 694 695 696 697 698 699 700
	/* 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;

701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
	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
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739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
	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
789 790 791 792
	error = bdi_init(&server->backing_dev_info);
	if (error)
		goto out_error;

793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842

	/* 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);

843 844 845
	init_waitqueue_head(&server->active_wq);
	atomic_set(&server->active, 0);

846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
	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);
869 870 871

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
872 873 874 875 876 877
	if (!IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	nfs_put_client(server->nfs_client);

	nfs_free_iostats(server->io_stats);
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Peter Zijlstra 已提交
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	bdi_destroy(&server->backing_dev_info);
879 880 881 882 883 884 885 886 887
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
888
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911
				     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;
912 913 914 915 916 917 918 919 920 921
	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;
	}

922 923 924 925 926 927 928 929 930
	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));

931 932 933
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956

	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	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
/*
 * Initialise an NFS4 client record
 */
static int nfs4_init_client(struct nfs_client *clp,
957
		const struct rpc_timeout *timeparms,
958
		const char *ip_addr,
959 960 961 962 963 964 965 966 967 968 969 970 971
		rpc_authflavor_t authflavour)
{
	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;

972
	error = nfs_create_rpc_client(clp, timeparms, authflavour,
973
					RPC_CLNT_CREATE_DISCRTRY);
974 975
	if (error < 0)
		goto error;
976
	memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
977 978 979 980 981 982 983

	error = nfs_idmap_new(clp);
	if (error < 0) {
		dprintk("%s: failed to create idmapper. Error = %d\n",
			__FUNCTION__, error);
		goto error;
	}
T
Trond Myklebust 已提交
984
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
985 986 987 988 989 990 991 992 993 994 995 996 997 998

	nfs_mark_client_ready(clp, NFS_CS_READY);
	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,
999 1000 1001
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
1002
		const char *ip_addr,
1003
		rpc_authflavor_t authflavour,
1004
		int proto, const struct rpc_timeout *timeparms)
1005
{
1006 1007
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
1008 1009
		.addr = addr,
		.addrlen = addrlen,
1010
		.rpc_ops = &nfs_v4_clientops,
1011
		.proto = proto,
1012
	};
1013 1014 1015 1016 1017 1018
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
1019
	clp = nfs_get_client(&cl_init);
1020 1021 1022 1023
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
1024
	error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	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;
}

/*
 * Create a version 4 volume record
 */
static int nfs4_init_server(struct nfs_server *server,
1043
		const struct nfs_parsed_mount_data *data)
1044
{
1045
	struct rpc_timeout timeparms;
1046 1047 1048 1049
	int error;

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

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
	nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
			data->timeo, data->retrans);

	/* 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,
			&timeparms);
	if (error < 0)
		goto error;

1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	/* Initialise the client representation from the mount data */
	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
	server->caps |= NFS_CAP_ATOMIC_OPEN;

	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;

1079 1080
	server->port = data->nfs_server.port;

1081
	error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1082

1083
error:
1084 1085 1086 1087 1088 1089 1090 1091 1092
	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1093
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
				      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 */
1107
	error = nfs4_init_server(server, data);
1108 1109 1110 1111 1112 1113 1114 1115
	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 */
1116
	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1117 1118 1119
	if (error < 0)
		goto error;

1120 1121 1122
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1123 1124 1125 1126 1127 1128
	dprintk("Mount FH: %d\n", mntfh->size);

	error = nfs_probe_fsinfo(server, mntfh, &fattr);
	if (error < 0)
		goto error;

1129 1130 1131
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	BUG_ON(!server->nfs_client);
	BUG_ON(!server->nfs_client->rpc_ops);
	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);

	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,
1155
					       struct nfs_fh *mntfh)
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
{
	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;

	/* Get a client representation.
	 * Note: NFSv4 always uses TCP, */
1173
	error = nfs4_set_client(server, data->hostname,
1174 1175
				data->addr,
				data->addrlen,
1176 1177 1178
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
1179
				parent_server->client->cl_timeout);
1180 1181
	if (error < 0)
		goto error;
1182 1183 1184 1185 1186

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

1187
	error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1188 1189 1190 1191 1192 1193 1194
	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);

1195 1196 1197 1198 1199
	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_path_walk(server, mntfh, data->mnt_path);
	if (error < 0)
		goto error;

1200
	/* probe the filesystem info for this server filesystem */
1201
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
1202 1203 1204
	if (error < 0)
		goto error;

1205 1206 1207
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1208
	dprintk("Referral FSID: %llx:%llx\n",
1209 1210
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241

	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",
1242 1243
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255

	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;

1256 1257 1258
	error = nfs_init_server_rpcclient(server,
			source->client->cl_timeout,
			source->client->cl_auth->au_flavor);
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
	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;

1269 1270 1271
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1272
	dprintk("Cloned FSID: %llx:%llx\n",
1273 1274
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294

	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);
}
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311

#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,
};

1312
static const struct file_operations nfs_server_list_fops = {
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
	.open		= nfs_server_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

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,
};

1332
static const struct file_operations nfs_volume_list_fops = {
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * 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);
1365
	return seq_list_start_head(&nfs_client_list, *_pos);
1366 1367 1368 1369 1370 1371 1372
}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1373
	return seq_list_next(v, &nfs_client_list, pos);
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
}

/*
 * 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 */
1392
	if (v == &nfs_client_list) {
1393 1394 1395 1396 1397 1398 1399
		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);

1400
	seq_printf(m, "v%u %s %s %3d %s\n",
1401
		   clp->rpc_ops->version,
1402 1403
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434
		   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);
1435
	return seq_list_start_head(&nfs_volume_list, *_pos);
1436 1437 1438 1439 1440 1441 1442
}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1443
	return seq_list_next(v, &nfs_volume_list, pos);
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
}

/*
 * 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 */
1464
	if (v == &nfs_volume_list) {
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
		seq_puts(m, "NV SERVER   PORT DEV     FSID\n");
		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",
1476 1477
		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
1478

1479
	seq_printf(m, "v%u %s %s %-7s %-17s\n",
1480
		   clp->rpc_ops->version,
1481 1482
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
		   dev,
		   fsid);

	return 0;
}

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

	proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
	if (!proc_fs_nfs)
		goto error_0;

	proc_fs_nfs->owner = THIS_MODULE;

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

	p->proc_fops = &nfs_server_list_fops;
	p->owner = THIS_MODULE;

	/* a file of volumes that we have mounted */
	p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
	if (!p)
		goto error_2;

	p->proc_fops = &nfs_volume_list_fops;
	p->owner = THIS_MODULE;
	return 0;

error_2:
	remove_proc_entry("servers", proc_fs_nfs);
error_1:
	remove_proc_entry("nfsfs", proc_root_fs);
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);
	remove_proc_entry("nfsfs", proc_root_fs);
}

#endif /* CONFIG_PROC_FS */