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client.c
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client.c
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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 ([email protected])
*
* 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>
#include <linux/sched.h>
#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>
#include <linux/sunrpc/xprtsock.h>
#include <linux/sunrpc/xprtrdma.h>
#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>
#include <linux/in6.h>
#include <net/ipv6.h>
#include <linux/nfs_xdr.h>
#include <linux/sunrpc/bc_xprt.h>
#include <asm/system.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
static LIST_HEAD(nfs_volume_list);
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
/*
* 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 */
struct nfs_client_initdata {
const char *hostname;
const struct sockaddr *addr;
size_t addrlen;
const struct nfs_rpc_ops *rpc_ops;
int proto;
u32 minorversion;
};
/*
* Allocate a shared client record
*
* Since these are allocated/deallocated very rarely, we don't
* bother putting them in a slab cache...
*/
static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
{
struct nfs_client *clp;
struct rpc_cred *cred;
int err = -ENOMEM;
if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
goto error_0;
clp->rpc_ops = cl_init->rpc_ops;
atomic_set(&clp->cl_count, 1);
clp->cl_cons_state = NFS_CS_INITING;
memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
clp->cl_addrlen = cl_init->addrlen;
if (cl_init->hostname) {
err = -ENOMEM;
clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
if (!clp->cl_hostname)
goto error_cleanup;
}
INIT_LIST_HEAD(&clp->cl_superblocks);
clp->cl_rpcclient = ERR_PTR(-EINVAL);
clp->cl_proto = cl_init->proto;
#ifdef CONFIG_NFS_V4
INIT_LIST_HEAD(&clp->cl_delegations);
spin_lock_init(&clp->cl_lock);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_boot_time = CURRENT_TIME;
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
clp->cl_minorversion = cl_init->minorversion;
#endif
cred = rpc_lookup_machine_cred();
if (!IS_ERR(cred))
clp->cl_machine_cred = cred;
nfs_fscache_get_client_cookie(clp);
return clp;
error_cleanup:
kfree(clp);
error_0:
return ERR_PTR(err);
}
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);
BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
nfs_idmap_delete(clp);
rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
#endif
}
/*
* Destroy the NFS4 callback service
*/
static void nfs4_destroy_callback(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4
if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
nfs_callback_down(clp->cl_minorversion);
#endif /* CONFIG_NFS_V4 */
}
/*
* Clears/puts all minor version specific parts from an nfs_client struct
* reverting it to minorversion 0.
*/
static void nfs4_clear_client_minor_version(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
if (nfs4_has_session(clp)) {
nfs4_destroy_session(clp->cl_session);
clp->cl_session = NULL;
}
clp->cl_call_sync = _nfs4_call_sync;
#endif /* CONFIG_NFS_V4_1 */
nfs4_destroy_callback(clp);
}
/*
* Destroy a shared client record
*/
static void nfs_free_client(struct nfs_client *clp)
{
dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
nfs4_clear_client_minor_version(clp);
nfs4_shutdown_client(clp);
nfs_fscache_release_client_cookie(clp);
/* -EIO all pending I/O */
if (!IS_ERR(clp->cl_rpcclient))
rpc_shutdown_client(clp->cl_rpcclient);
if (clp->cl_machine_cred != NULL)
put_rpccred(clp->cl_machine_cred);
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)
{
if (!clp)
return;
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);
}
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/*
* Test if two ip6 socket addresses refer to the same socket by
* comparing relevant fields. The padding bytes specifically, are not
* compared. sin6_flowinfo is not compared because it only affects QoS
* and sin6_scope_id is only compared if the address is "link local"
* because "link local" addresses need only be unique to a specific
* link. Conversely, ordinary unicast addresses might have different
* sin6_scope_id.
*
* The caller should ensure both socket addresses are AF_INET6.
*/
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
sin1->sin6_scope_id != sin2->sin6_scope_id)
return 0;
return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
}
#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
return 0;
}
#endif
/*
* Test if two ip4 socket addresses refer to the same socket, by
* comparing relevant fields. The padding bytes specifically, are
* not compared.
*
* The caller should ensure both socket addresses are AF_INET.
*/
static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}
static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
(sin1->sin6_port == sin2->sin6_port);
}
static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
(sin1->sin_port == sin2->sin_port);
}
/*
* Test if two socket addresses represent the same actual socket,
* by comparing (only) relevant fields, excluding the port number.
*/
static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
if (sa1->sa_family != sa2->sa_family)
return 0;
switch (sa1->sa_family) {
case AF_INET:
return nfs_sockaddr_match_ipaddr4(sa1, sa2);
case AF_INET6:
return nfs_sockaddr_match_ipaddr6(sa1, sa2);
}
return 0;
}
/*
* Test if two socket addresses represent the same actual socket,
* by comparing (only) relevant fields, including the port number.
*/
static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
const struct sockaddr *sa2)
{
if (sa1->sa_family != sa2->sa_family)
return 0;
switch (sa1->sa_family) {
case AF_INET:
return nfs_sockaddr_cmp_ip4(sa1, sa2);
case AF_INET6:
return nfs_sockaddr_cmp_ip6(sa1, sa2);
}
return 0;
}
/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
{
struct nfs_client *clp;
spin_lock(&nfs_client_lock);
list_for_each_entry(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 ||
clp->cl_cons_state == NFS_CS_SESSION_INITING))
continue;
/* Different NFS versions cannot share the same nfs_client */
if (clp->rpc_ops->version != nfsversion)
continue;
/* Match only the IP address, not the port number */
if (!nfs_sockaddr_match_ipaddr(addr, clap))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
}
/*
* Find a client by IP address and protocol version
* - returns NULL if no such client
*/
struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
{
struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
u32 nfsvers = clp->rpc_ops->version;
spin_lock(&nfs_client_lock);
list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* Don't match clients that failed to initialise properly */
if (clp->cl_cons_state != NFS_CS_READY)
continue;
/* Different NFS versions cannot share the same nfs_client */
if (clp->rpc_ops->version != nfsvers)
continue;
/* Match only the IP address, not the port number */
if (!nfs_sockaddr_match_ipaddr(sap, clap))
continue;
atomic_inc(&clp->cl_count);
spin_unlock(&nfs_client_lock);
return clp;
}
spin_unlock(&nfs_client_lock);
return NULL;
}
/*
* Find an nfs_client on the list that matches the initialisation data
* that is supplied.
*/
static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
{
struct nfs_client *clp;
const struct sockaddr *sap = data->addr;
list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* 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 */
if (clp->rpc_ops != data->rpc_ops)
continue;
if (clp->cl_proto != data->proto)
continue;
/* Match nfsv4 minorversion */
if (clp->cl_minorversion != data->minorversion)
continue;
/* Match the full socket address */
if (!nfs_sockaddr_cmp(sap, clap))
continue;
atomic_inc(&clp->cl_count);
return clp;
}
return NULL;
}
/*
* Look up a client by IP address and protocol version
* - creates a new record if one doesn't yet exist
*/
static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
{
struct nfs_client *clp, *new = NULL;
int error;
dprintk("--> nfs_get_client(%s,v%u)\n",
cl_init->hostname ?: "", cl_init->rpc_ops->version);
/* see if the client already exists */
do {
spin_lock(&nfs_client_lock);
clp = nfs_match_client(cl_init);
if (clp)
goto found_client;
if (new)
goto install_client;
spin_unlock(&nfs_client_lock);
new = nfs_alloc_client(cl_init);
} while (!IS_ERR(new));
dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
return new;
/* 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);
error = wait_event_killable(nfs_client_active_wq,
clp->cl_cons_state < NFS_CS_INITING);
if (error < 0) {
nfs_put_client(clp);
return ERR_PTR(-ERESTARTSYS);
}
if (clp->cl_cons_state < NFS_CS_READY) {
error = clp->cl_cons_state;
nfs_put_client(clp);
return ERR_PTR(error);
}
BUG_ON(clp->cl_cons_state != NFS_CS_READY);
dprintk("--> nfs_get_client() = %p [share]\n", clp);
return clp;
}
/*
* Mark a server as ready or failed
*/
void nfs_mark_client_ready(struct nfs_client *clp, int state)
{
clp->cl_cons_state = state;
wake_up_all(&nfs_client_active_wq);
}
/*
* With sessions, the client is not marked ready until after a
* successful EXCHANGE_ID and CREATE_SESSION.
*
* Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
* other versions of NFS can be tried.
*/
int nfs4_check_client_ready(struct nfs_client *clp)
{
if (!nfs4_has_session(clp))
return 0;
if (clp->cl_cons_state < NFS_CS_READY)
return -EPROTONOSUPPORT;
return 0;
}
/*
* Initialise the timeout values for a connection
*/
static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
unsigned int timeo, unsigned int retrans)
{
to->to_initval = timeo * HZ / 10;
to->to_retries = retrans;
switch (proto) {
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
if (to->to_retries == 0)
to->to_retries = NFS_DEF_TCP_RETRANS;
if (to->to_initval == 0)
to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
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);
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;
to->to_exponential = 0;
break;
case XPRT_TRANSPORT_UDP:
if (to->to_retries == 0)
to->to_retries = NFS_DEF_UDP_RETRANS;
if (!to->to_initval)
to->to_initval = NFS_DEF_UDP_TIMEO * 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;
default:
BUG();
}
}
/*
* Create an RPC client handle
*/
static int nfs_create_rpc_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
rpc_authflavor_t flavor,
int discrtry, int noresvport)
{
struct rpc_clnt *clnt = NULL;
struct rpc_create_args args = {
.protocol = clp->cl_proto,
.address = (struct sockaddr *)&clp->cl_addr,
.addrsize = clp->cl_addrlen,
.timeout = timeparms,
.servername = clp->cl_hostname,
.program = &nfs_program,
.version = clp->rpc_ops->version,
.authflavor = flavor,
};
if (discrtry)
args.flags |= RPC_CLNT_CREATE_DISCRTRY;
if (noresvport)
args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
if (!IS_ERR(clp->cl_rpcclient))
return 0;
clnt = rpc_create(&args);
if (IS_ERR(clnt)) {
dprintk("%s: cannot create RPC client. Error = %ld\n",
__func__, PTR_ERR(clnt));
return PTR_ERR(clnt);
}
clp->cl_rpcclient = clnt;
return 0;
}
/*
* Version 2 or 3 client destruction
*/
static void nfs_destroy_server(struct nfs_server *server)
{
if (!(server->flags & NFS_MOUNT_NONLM))
nlmclnt_done(server->nlm_host);
}
/*
* Version 2 or 3 lockd setup
*/
static int nfs_start_lockd(struct nfs_server *server)
{
struct nlm_host *host;
struct nfs_client *clp = server->nfs_client;
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,
.noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
1 : 0,
};
if (nlm_init.nfs_version > 3)
return 0;
if (server->flags & NFS_MOUNT_NONLM)
return 0;
host = nlmclnt_init(&nlm_init);
if (IS_ERR(host))
return PTR_ERR(host);
server->nlm_host = host;
server->destroy = nfs_destroy_server;
return 0;
}
/*
* Initialise an NFSv3 ACL client connection
*/
#ifdef CONFIG_NFS_V3_ACL
static void nfs_init_server_aclclient(struct nfs_server *server)
{
if (server->nfs_client->rpc_ops->version != 3)
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,
const struct rpc_timeout *timeo,
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", __func__);
return PTR_ERR(server->client);
}
memcpy(&server->client->cl_timeout_default,
timeo,
sizeof(server->client->cl_timeout_default));
server->client->cl_timeout = &server->client->cl_timeout_default;
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", __func__);
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
*/
static int nfs_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const struct nfs_parsed_mount_data *data)
{
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
*/
error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
0, data->flags & NFS_MOUNT_NORESVPORT);
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
*/
static int nfs_init_server(struct nfs_server *server,
const struct nfs_parsed_mount_data *data)
{
struct nfs_client_initdata cl_init = {
.hostname = data->nfs_server.hostname,
.addr = (const struct sockaddr *)&data->nfs_server.address,
.addrlen = data->nfs_server.addrlen,
.rpc_ops = &nfs_v2_clientops,
.proto = data->nfs_server.protocol,
};
struct rpc_timeout timeparms;
struct nfs_client *clp;
int error;
dprintk("--> nfs_init_server()\n");
#ifdef CONFIG_NFS_V3
if (data->flags & NFS_MOUNT_VER3)
cl_init.rpc_ops = &nfs_v3_clientops;
#endif
/* Allocate or find a client reference we can use */
clp = nfs_get_client(&cl_init);
if (IS_ERR(clp)) {
dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
return PTR_ERR(clp);
}
nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
data->timeo, data->retrans);
error = nfs_init_client(clp, &timeparms, data);
if (error < 0)
goto error;
server->nfs_client = clp;
/* Initialise the client representation from the mount data */
server->flags = data->flags;
server->options = data->options;
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;
server->port = data->nfs_server.port;
error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
if (error < 0)
goto error;
/* 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;
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;
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);
error = bdi_init(&server->backing_dev_info);
if (error)
goto out_error;
/* 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);
atomic_set(&server->active, 0);
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)