client.c 35.7 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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};

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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);

#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);
#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 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;

		/* 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_interruptible(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)
			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);
		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, int proto,
						unsigned int timeo,
						unsigned int retrans,
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						rpc_authflavor_t flavor,
						int flags)
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{
	struct rpc_timeout	timeparms;
	struct rpc_clnt		*clnt = NULL;
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	struct rpc_create_args args = {
		.protocol	= proto,
		.address	= (struct sockaddr *)&clp->cl_addr,
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		.addrsize	= clp->cl_addrlen,
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		.timeout	= &timeparms,
		.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;

	nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
	clp->retrans_timeo = timeparms.to_initval;
	clp->retrans_count = timeparms.to_retries;

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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))
		lockd_down();	/* release rpc.lockd */
}

/*
 * Version 2 or 3 lockd setup
 */
static int nfs_start_lockd(struct nfs_server *server)
{
	int error = 0;

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	if (server->nfs_client->rpc_ops->version > 3)
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		goto out;
	if (server->flags & NFS_MOUNT_NONLM)
		goto out;
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	error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
			IPPROTO_TCP : IPPROTO_UDP);
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	if (error < 0)
		server->flags |= NFS_MOUNT_NONLM;
	else
		server->destroy = nfs_destroy_server;
out:
	return error;
}

/*
 * 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
 */
static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
{
	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);
	}

	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;

	server->client->cl_intr = 0;
	if (server->flags & NFS4_MOUNT_INTR)
		server->client->cl_intr = 1;

	return 0;
}

/*
 * Initialise an NFS2 or NFS3 client
 */
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static int nfs_init_client(struct nfs_client *clp,
			   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, data->nfs_server.protocol,
				data->timeo, data->retrans, 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 = sizeof(data->nfs_server.address),
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		.rpc_ops = &nfs_v2_clientops,
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	};
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	struct nfs_client *clp;
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	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);
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	if (IS_ERR(clp)) {
		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
		return PTR_ERR(clp);
	}

	error = nfs_init_client(clp, data);
	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;

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	error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
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	if (error < 0)
		goto error;

	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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670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
	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
720 721 722 723
	error = bdi_init(&server->backing_dev_info);
	if (error)
		goto out_error;

724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773

	/* 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);

774 775 776
	init_waitqueue_head(&server->active_wq);
	atomic_set(&server->active, 0);

777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
	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);
800 801 802

	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
803 804 805 806 807 808
	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
809
	bdi_destroy(&server->backing_dev_info);
810 811 812 813 814 815 816 817 818
	kfree(server);
	nfs_release_automount_timer();
	dprintk("<-- nfs_free_server()\n");
}

/*
 * Create a version 2 or 3 volume record
 * - keyed on server and FSID
 */
819
struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
				     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;
843 844 845 846 847 848 849 850 851 852
	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;
	}

853 854 855 856 857 858 859 860 861
	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));

862 863 864
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888

	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,
		int proto, int timeo, int retrans,
889
		const char *ip_addr,
890 891 892 893 894 895 896 897 898 899 900 901 902
		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;

903 904
	error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
					RPC_CLNT_CREATE_DISCRTRY);
905 906
	if (error < 0)
		goto error;
907
	memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
908 909 910 911 912 913 914

	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
915
	__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
916 917 918 919 920 921 922 923 924 925 926 927 928 929

	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,
930 931 932
		const char *hostname,
		const struct sockaddr *addr,
		const size_t addrlen,
933
		const char *ip_addr,
934 935 936
		rpc_authflavor_t authflavour,
		int proto, int timeo, int retrans)
{
937 938
	struct nfs_client_initdata cl_init = {
		.hostname = hostname,
939 940
		.addr = addr,
		.addrlen = addrlen,
941
		.rpc_ops = &nfs_v4_clientops,
942
	};
943 944 945 946 947 948
	struct nfs_client *clp;
	int error;

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

	/* Allocate or find a client reference we can use */
949
	clp = nfs_get_client(&cl_init);
950 951 952 953
	if (IS_ERR(clp)) {
		error = PTR_ERR(clp);
		goto error;
	}
954
	error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
	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,
973
		const struct nfs_parsed_mount_data *data)
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
{
	int error;

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

	/* 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;

993
	error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
994 995 996 997 998 999 1000 1001 1002 1003

	/* Done */
	dprintk("<-- nfs4_init_server() = %d\n", error);
	return error;
}

/*
 * Create a version 4 volume record
 * - keyed on server and FSID
 */
1004
struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
				      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);

	/* Get a client record */
1018 1019
	error = nfs4_set_client(server,
			data->nfs_server.hostname,
1020 1021
			(struct sockaddr *)&data->nfs_server.address,
			sizeof(data->nfs_server.address),
1022 1023 1024 1025
			data->client_address,
			data->auth_flavors[0],
			data->nfs_server.protocol,
			data->timeo, data->retrans);
1026 1027 1028 1029
	if (error < 0)
		goto error;

	/* set up the general RPC client */
1030
	error = nfs4_init_server(server, data);
1031 1032 1033 1034 1035 1036 1037 1038
	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 */
1039
	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1040 1041 1042
	if (error < 0)
		goto error;

1043 1044 1045
	dprintk("Server FSID: %llx:%llx\n",
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1046 1047 1048 1049 1050 1051
	dprintk("Mount FH: %d\n", mntfh->size);

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

1052 1053 1054
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	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,
1078
					       struct nfs_fh *mntfh)
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
{
	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, */
1096 1097 1098 1099 1100 1101 1102 1103
	error = nfs4_set_client(server, data->hostname,
				(struct sockaddr *)data->addr,
				sizeof(*data->addr),
				parent_client->cl_ipaddr,
				data->authflavor,
				parent_server->client->cl_xprt->prot,
				parent_client->retrans_timeo,
				parent_client->retrans_count);
1104 1105
	if (error < 0)
		goto error;
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118

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

	error = nfs_init_server_rpcclient(server, data->authflavor);
	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);

1119 1120 1121 1122 1123
	/* Probe the root fh to retrieve its FSID and filehandle */
	error = nfs4_path_walk(server, mntfh, data->mnt_path);
	if (error < 0)
		goto error;

1124
	/* probe the filesystem info for this server filesystem */
1125
	error = nfs_probe_fsinfo(server, mntfh, &fattr);
1126 1127 1128
	if (error < 0)
		goto error;

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

1132
	dprintk("Referral FSID: %llx:%llx\n",
1133 1134
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165

	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",
1166 1167
		(unsigned long long) fattr->fsid.major,
		(unsigned long long) fattr->fsid.minor);
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

	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;

	error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
	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;

1191 1192 1193
	if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
		server->namelen = NFS4_MAXNAMLEN;

1194
	dprintk("Cloned FSID: %llx:%llx\n",
1195 1196
		(unsigned long long) server->fsid.major,
		(unsigned long long) server->fsid.minor);
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216

	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);
}
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233

#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,
};

1234
static const struct file_operations nfs_server_list_fops = {
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
	.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,
};

1254
static const struct file_operations nfs_volume_list_fops = {
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	.open		= nfs_volume_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * 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);
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	return seq_list_start_head(&nfs_client_list, *_pos);
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}

/*
 * move to next server
 */
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
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	return seq_list_next(v, &nfs_client_list, pos);
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}

/*
 * clean up after reading from the transports list
 */
static void nfs_server_list_stop(struct seq_file *p, void *v)
{
	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 */
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	if (v == &nfs_client_list) {
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		seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
		return 0;
	}

	/* display one transport per line on subsequent lines */
	clp = list_entry(v, struct nfs_client, cl_share_link);

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	seq_printf(m, "v%u %s %s %3d %s\n",
1323
		   clp->rpc_ops->version,
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		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
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		   atomic_read(&clp->cl_count),
		   clp->cl_hostname);

	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);
1357
	return seq_list_start_head(&nfs_volume_list, *_pos);
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}

/*
 * move to next volume
 */
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
1365
	return seq_list_next(v, &nfs_volume_list, pos);
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}

/*
 * clean up after reading from the transports list
 */
static void nfs_volume_list_stop(struct seq_file *p, void *v)
{
	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 */
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	if (v == &nfs_volume_list) {
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		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",
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		 (unsigned long long) server->fsid.major,
		 (unsigned long long) server->fsid.minor);
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1401
	seq_printf(m, "v%u %s %s %-7s %-17s\n",
1402
		   clp->rpc_ops->version,
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		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
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		   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 */