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OpenCloudOS-Kernel/fs/nfs/client.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/* client.c: NFS client sharing and management code
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#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/addr.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/vfs.h>
#include <linux/inet.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <net/ipv6.h>
#include <linux/nfs_xdr.h>
#include <linux/sunrpc/bc_xprt.h>
#include <linux/nsproxy.h>
#include <linux/pid_namespace.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
#include "fscache.h"
#include "pnfs.h"
#include "nfs.h"
#include "netns.h"
#include "sysfs.h"
#include "nfs42.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
static DEFINE_SPINLOCK(nfs_version_lock);
static DEFINE_MUTEX(nfs_version_mutex);
static LIST_HEAD(nfs_versions);
/*
* RPC cruft for NFS
*/
static const struct rpc_version *nfs_version[5] = {
[2] = NULL,
[3] = NULL,
[4] = NULL,
};
const 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_PIPE_DIRNAME,
};
struct rpc_stat nfs_rpcstat = {
.program = &nfs_program
};
static struct nfs_subversion *find_nfs_version(unsigned int version)
{
struct nfs_subversion *nfs;
spin_lock(&nfs_version_lock);
list_for_each_entry(nfs, &nfs_versions, list) {
if (nfs->rpc_ops->version == version) {
spin_unlock(&nfs_version_lock);
return nfs;
}
}
spin_unlock(&nfs_version_lock);
return ERR_PTR(-EPROTONOSUPPORT);
}
struct nfs_subversion *get_nfs_version(unsigned int version)
{
struct nfs_subversion *nfs = find_nfs_version(version);
if (IS_ERR(nfs)) {
mutex_lock(&nfs_version_mutex);
request_module("nfsv%d", version);
nfs = find_nfs_version(version);
mutex_unlock(&nfs_version_mutex);
}
if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
return ERR_PTR(-EAGAIN);
return nfs;
}
void put_nfs_version(struct nfs_subversion *nfs)
{
module_put(nfs->owner);
}
void register_nfs_version(struct nfs_subversion *nfs)
{
spin_lock(&nfs_version_lock);
list_add(&nfs->list, &nfs_versions);
nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
spin_unlock(&nfs_version_lock);
}
EXPORT_SYMBOL_GPL(register_nfs_version);
void unregister_nfs_version(struct nfs_subversion *nfs)
{
spin_lock(&nfs_version_lock);
nfs_version[nfs->rpc_ops->version] = NULL;
list_del(&nfs->list);
spin_unlock(&nfs_version_lock);
}
EXPORT_SYMBOL_GPL(unregister_nfs_version);
/*
* Allocate a shared client record
*
* Since these are allocated/deallocated very rarely, we don't
* bother putting them in a slab cache...
*/
struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
{
struct nfs_client *clp;
int err = -ENOMEM;
if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
goto error_0;
clp->cl_minorversion = cl_init->minorversion;
clp->cl_nfs_mod = cl_init->nfs_mod;
if (!try_module_get(clp->cl_nfs_mod->owner))
goto error_dealloc;
clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
refcount_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_flags = cl_init->init_flags;
clp->cl_proto = cl_init->proto;
clp->cl_nconnect = cl_init->nconnect;
clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
clp->cl_net = get_net(cl_init->net);
clp->cl_principal = "*";
clp->cl_xprtsec = cl_init->xprtsec;
return clp;
error_cleanup:
put_nfs_version(clp->cl_nfs_mod);
error_dealloc:
kfree(clp);
error_0:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(nfs_alloc_client);
#if IS_ENABLED(CONFIG_NFS_V4)
static void nfs_cleanup_cb_ident_idr(struct net *net)
{
struct nfs_net *nn = net_generic(net, nfs_net_id);
idr_destroy(&nn->cb_ident_idr);
}
/* nfs_client_lock held */
static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
{
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
if (clp->cl_cb_ident)
idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
}
static void pnfs_init_server(struct nfs_server *server)
{
rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
}
#else
static void nfs_cleanup_cb_ident_idr(struct net *net)
{
}
static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
{
}
static void pnfs_init_server(struct nfs_server *server)
{
}
#endif /* CONFIG_NFS_V4 */
/*
* Destroy a shared client record
*/
void nfs_free_client(struct nfs_client *clp)
{
/* -EIO all pending I/O */
if (!IS_ERR(clp->cl_rpcclient))
rpc_shutdown_client(clp->cl_rpcclient);
put_net(clp->cl_net);
put_nfs_version(clp->cl_nfs_mod);
kfree(clp->cl_hostname);
kfree(clp->cl_acceptor);
kfree(clp);
}
EXPORT_SYMBOL_GPL(nfs_free_client);
/*
* Release a reference to a shared client record
*/
void nfs_put_client(struct nfs_client *clp)
{
struct nfs_net *nn;
if (!clp)
return;
nn = net_generic(clp->cl_net, nfs_net_id);
if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
list_del(&clp->cl_share_link);
nfs_cb_idr_remove_locked(clp);
spin_unlock(&nn->nfs_client_lock);
WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
clp->rpc_ops->free_client(clp);
}
}
EXPORT_SYMBOL_GPL(nfs_put_client);
/*
* 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 = (struct sockaddr *)data->addr;
struct nfs_net *nn = net_generic(data->net, nfs_net_id);
int error;
again:
list_for_each_entry(clp, &nn->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;
/* If a client is still initializing then we need to wait */
if (clp->cl_cons_state > NFS_CS_READY) {
refcount_inc(&clp->cl_count);
spin_unlock(&nn->nfs_client_lock);
error = nfs_wait_client_init_complete(clp);
nfs_put_client(clp);
spin_lock(&nn->nfs_client_lock);
if (error < 0)
return ERR_PTR(error);
goto again;
}
/* Different NFS versions cannot share the same nfs_client */
if (clp->rpc_ops != data->nfs_mod->rpc_ops)
continue;
if (clp->cl_proto != data->proto)
continue;
/* Match nfsv4 minorversion */
if (clp->cl_minorversion != data->minorversion)
continue;
/* Match request for a dedicated DS */
if (test_bit(NFS_CS_DS, &data->init_flags) !=
test_bit(NFS_CS_DS, &clp->cl_flags))
continue;
/* Match the full socket address */
if (!rpc_cmp_addr_port(sap, clap))
/* Match all xprt_switch full socket addresses */
if (IS_ERR(clp->cl_rpcclient) ||
!rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
sap))
continue;
/* Match the xprt security policy */
if (clp->cl_xprtsec.policy != data->xprtsec.policy)
continue;
refcount_inc(&clp->cl_count);
return clp;
}
return NULL;
}
/*
* Return true if @clp is done initializing, false if still working on it.
*
* Use nfs_client_init_status to check if it was successful.
*/
bool nfs_client_init_is_complete(const struct nfs_client *clp)
{
return clp->cl_cons_state <= NFS_CS_READY;
}
EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
/*
* Return 0 if @clp was successfully initialized, -errno otherwise.
*
* This must be called *after* nfs_client_init_is_complete() returns true,
* otherwise it will pop WARN_ON_ONCE and return -EINVAL
*/
int nfs_client_init_status(const struct nfs_client *clp)
{
/* called without checking nfs_client_init_is_complete */
if (clp->cl_cons_state > NFS_CS_READY) {
WARN_ON_ONCE(1);
return -EINVAL;
}
return clp->cl_cons_state;
}
EXPORT_SYMBOL_GPL(nfs_client_init_status);
int nfs_wait_client_init_complete(const struct nfs_client *clp)
{
return wait_event_killable(nfs_client_active_wq,
nfs_client_init_is_complete(clp));
}
EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
/*
* Found an existing client. Make sure it's ready before returning.
*/
static struct nfs_client *
nfs_found_client(const struct nfs_client_initdata *cl_init,
struct nfs_client *clp)
{
int error;
error = nfs_wait_client_init_complete(clp);
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);
}
smp_rmb();
return clp;
}
/*
* Look up a client by IP address and protocol version
* - creates a new record if one doesn't yet exist
*/
struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
{
struct nfs_client *clp, *new = NULL;
struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
if (cl_init->hostname == NULL) {
WARN_ON(1);
return ERR_PTR(-EINVAL);
}
/* see if the client already exists */
do {
spin_lock(&nn->nfs_client_lock);
clp = nfs_match_client(cl_init);
if (clp) {
spin_unlock(&nn->nfs_client_lock);
if (new)
new->rpc_ops->free_client(new);
if (IS_ERR(clp))
return clp;
return nfs_found_client(cl_init, clp);
}
if (new) {
list_add_tail(&new->cl_share_link,
&nn->nfs_client_list);
spin_unlock(&nn->nfs_client_lock);
return rpc_ops->init_client(new, cl_init);
}
spin_unlock(&nn->nfs_client_lock);
new = rpc_ops->alloc_client(cl_init);
} while (!IS_ERR(new));
return new;
}
EXPORT_SYMBOL_GPL(nfs_get_client);
/*
* Mark a server as ready or failed
*/
void nfs_mark_client_ready(struct nfs_client *clp, int state)
{
smp_wmb();
clp->cl_cons_state = state;
wake_up_all(&nfs_client_active_wq);
}
EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
/*
* Initialise the timeout values for a connection
*/
void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
int timeo, int retrans)
{
to->to_initval = timeo * HZ / 10;
to->to_retries = retrans;
switch (proto) {
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_TCP_TLS:
case XPRT_TRANSPORT_RDMA:
if (retrans == NFS_UNSPEC_RETRANS)
to->to_retries = NFS_DEF_TCP_RETRANS;
if (timeo == NFS_UNSPEC_TIMEO || 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 (retrans == NFS_UNSPEC_RETRANS)
to->to_retries = NFS_DEF_UDP_RETRANS;
if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
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();
}
}
EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
/*
* Create an RPC client handle
*/
int nfs_create_rpc_client(struct nfs_client *clp,
const struct nfs_client_initdata *cl_init,
rpc_authflavor_t flavor)
{
struct rpc_clnt *clnt = NULL;
struct rpc_create_args args = {
.net = clp->cl_net,
.protocol = clp->cl_proto,
.nconnect = clp->cl_nconnect,
.address = (struct sockaddr *)&clp->cl_addr,
.addrsize = clp->cl_addrlen,
.timeout = cl_init->timeparms,
.servername = clp->cl_hostname,
.nodename = cl_init->nodename,
.program = &nfs_program,
.version = clp->rpc_ops->version,
.authflavor = flavor,
.cred = cl_init->cred,
.xprtsec = cl_init->xprtsec,
};
if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_DISCRTRY;
if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_NOPING;
if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_REUSEPORT;
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);
}
clnt->cl_principal = clp->cl_principal;
clp->cl_rpcclient = clnt;
clnt->cl_max_connect = clp->cl_max_connect;
return 0;
}
EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
/*
* Version 2 or 3 client destruction
*/
static void nfs_destroy_server(struct nfs_server *server)
{
if (server->nlm_host)
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,
.nfs_version = clp->rpc_ops->version,
.noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
1 : 0,
.net = clp->cl_net,
.nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
.cred = server->cred,
};
if (nlm_init.nfs_version > 3)
return 0;
if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
(server->flags & NFS_MOUNT_LOCAL_FCNTL))
return 0;
switch (clp->cl_proto) {
default:
nlm_init.protocol = IPPROTO_TCP;
break;
#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
case XPRT_TRANSPORT_UDP:
nlm_init.protocol = IPPROTO_UDP;
#endif
}
host = nlmclnt_init(&nlm_init);
if (IS_ERR(host))
return PTR_ERR(host);
server->nlm_host = host;
server->destroy = nfs_destroy_server;
nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
return 0;
}
/*
* Create a general RPC client
*/
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_set_auth(clp->cl_rpcclient,
pseudoflavour);
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;
server->client->cl_softrtry = 0;
if (server->flags & NFS_MOUNT_SOFTERR)
server->client->cl_softerr = 1;
if (server->flags & NFS_MOUNT_SOFT)
server->client->cl_softrtry = 1;
nfs_sysfs_link_rpc_client(server, server->client, NULL);
return 0;
}
EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
/**
* nfs_init_client - Initialise an NFS2 or NFS3 client
*
* @clp: nfs_client to initialise
* @cl_init: Initialisation parameters
*
* Returns pointer to an NFS client, or an ERR_PTR value.
*/
struct nfs_client *nfs_init_client(struct nfs_client *clp,
const struct nfs_client_initdata *cl_init)
{
int error;
/* the client is already initialised */
if (clp->cl_cons_state == NFS_CS_READY)
return clp;
/*
* Create a client RPC handle for doing FSSTAT with UNIX auth only
* - RFC 2623, sec 2.3.2
*/
error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
if (error < 0) {
nfs_put_client(clp);
clp = ERR_PTR(error);
}
return clp;
}
EXPORT_SYMBOL_GPL(nfs_init_client);
/*
* Create a version 2 or 3 client
*/
static int nfs_init_server(struct nfs_server *server,
const struct fs_context *fc)
{
const struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct rpc_timeout timeparms;
struct nfs_client_initdata cl_init = {
.hostname = ctx->nfs_server.hostname,
.addr = &ctx->nfs_server._address,
.addrlen = ctx->nfs_server.addrlen,
.nfs_mod = ctx->nfs_mod,
.proto = ctx->nfs_server.protocol,
.net = fc->net_ns,
.timeparms = &timeparms,
.cred = server->cred,
.nconnect = ctx->nfs_server.nconnect,
.init_flags = (1UL << NFS_CS_REUSEPORT),
.xprtsec = ctx->xprtsec,
};
struct nfs_client *clp;
int error;
nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
ctx->timeo, ctx->retrans);
if (ctx->flags & NFS_MOUNT_NORESVPORT)
set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
/* Allocate or find a client reference we can use */
clp = nfs_get_client(&cl_init);
if (IS_ERR(clp))
return PTR_ERR(clp);
server->nfs_client = clp;
nfs_sysfs_add_server(server);
nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
/* Initialise the client representation from the mount data */
server->flags = ctx->flags;
server->options = ctx->options;
server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
switch (clp->rpc_ops->version) {
case 2:
server->fattr_valid = NFS_ATTR_FATTR_V2;
break;
case 3:
server->fattr_valid = NFS_ATTR_FATTR_V3;
break;
default:
server->fattr_valid = NFS_ATTR_FATTR_V4;
}
if (ctx->rsize)
server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
if (ctx->wsize)
server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
server->acregmin = ctx->acregmin * HZ;
server->acregmax = ctx->acregmax * HZ;
server->acdirmin = ctx->acdirmin * HZ;
server->acdirmax = ctx->acdirmax * HZ;
/* Start lockd here, before we might error out */
error = nfs_start_lockd(server);
if (error < 0)
goto error;
server->port = ctx->nfs_server.port;
server->auth_info = ctx->auth_info;
error = nfs_init_server_rpcclient(server, &timeparms,
ctx->selected_flavor);
if (error < 0)
goto error;
/* Preserve the values of mount_server-related mount options */
if (ctx->mount_server.addrlen) {
memcpy(&server->mountd_address, &ctx->mount_server.address,
ctx->mount_server.addrlen);
server->mountd_addrlen = ctx->mount_server.addrlen;
}
server->mountd_version = ctx->mount_server.version;
server->mountd_port = ctx->mount_server.port;
server->mountd_protocol = ctx->mount_server.protocol;
server->namelen = ctx->namlen;
return 0;
error:
server->nfs_client = NULL;
nfs_put_client(clp);
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)
{
struct nfs_client *clp = server->nfs_client;
unsigned long max_rpc_payload, raw_max_rpc_payload;
/* Work out a lot of parameters */
if (server->rsize == 0)
server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
if (server->wsize == 0)
server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
raw_max_rpc_payload = rpc_max_payload(server->client);
max_rpc_payload = nfs_block_size(raw_max_rpc_payload, 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_SIZE - 1) >> PAGE_SHIFT;
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_SIZE - 1) >> PAGE_SHIFT;
server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
server->dtsize = NFS_MAX_FILE_IO_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;
server->time_delta = fsinfo->time_delta;
server->change_attr_type = fsinfo->change_attr_type;
server->clone_blksize = fsinfo->clone_blksize;
/* We're airborne Set socket buffersize */
rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
#ifdef CONFIG_NFS_V4_2
/*
* Defaults until limited by the session parameters.
*/
server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
XATTR_SIZE_MAX);
server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
XATTR_SIZE_MAX);
server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
if (fsinfo->xattr_support)
server->caps |= NFS_CAP_XATTR;
#endif
}
/*
* 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;
if (clp->rpc_ops->set_capabilities != NULL) {
error = clp->rpc_ops->set_capabilities(server, mntfh);
if (error < 0)
return error;
}
fsinfo.fattr = fattr;
fsinfo.nlayouttypes = 0;
memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
if (error < 0)
return error;
nfs_server_set_fsinfo(server, &fsinfo);
/* Get some general file system info */
if (server->namelen == 0) {
struct nfs_pathconf pathinfo;
pathinfo.fattr = fattr;
nfs_fattr_init(fattr);
if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
server->namelen = pathinfo.max_namelen;
}
if (clp->rpc_ops->discover_trunking != NULL &&
(server->caps & NFS_CAP_FS_LOCATIONS &&
(server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
error = clp->rpc_ops->discover_trunking(server, mntfh);
if (error < 0)
return error;
}
return 0;
}
/*
* Grab the destination's particulars, including lease expiry time.
*
* Returns zero if probe succeeded and retrieved FSID matches the FSID
* we have cached.
*/
int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
{
struct nfs_fattr *fattr;
int error;
fattr = nfs_alloc_fattr();
if (fattr == NULL)
return -ENOMEM;
/* Sanity: the probe won't work if the destination server
* does not recognize the migrated FH. */
error = nfs_probe_fsinfo(server, mntfh, fattr);
nfs_free_fattr(fattr);
return error;
}
EXPORT_SYMBOL_GPL(nfs_probe_server);
/*
* Copy useful information when duplicating a server record
*/
void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
{
target->flags = source->flags;
target->rsize = source->rsize;
target->wsize = source->wsize;
target->acregmin = source->acregmin;
target->acregmax = source->acregmax;
target->acdirmin = source->acdirmin;
target->acdirmax = source->acdirmax;
target->caps = source->caps;
target->options = source->options;
target->auth_info = source->auth_info;
target->port = source->port;
}
EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
void nfs_server_insert_lists(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
spin_lock(&nn->nfs_client_lock);
list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
list_add_tail(&server->master_link, &nn->nfs_volume_list);
clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
spin_unlock(&nn->nfs_client_lock);
}
EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
void nfs_server_remove_lists(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs_net *nn;
if (clp == NULL)
return;
nn = net_generic(clp->cl_net, nfs_net_id);
spin_lock(&nn->nfs_client_lock);
list_del_rcu(&server->client_link);
if (list_empty(&clp->cl_superblocks))
set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
list_del(&server->master_link);
spin_unlock(&nn->nfs_client_lock);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
static DEFINE_IDA(s_sysfs_ids);
/*
* Allocate and initialise a server record
*/
struct nfs_server *nfs_alloc_server(void)
{
struct nfs_server *server;
server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
if (!server)
return NULL;
server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
if (server->s_sysfs_id < 0) {
kfree(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);
INIT_LIST_HEAD(&server->delegations);
INIT_LIST_HEAD(&server->layouts);
INIT_LIST_HEAD(&server->state_owners_lru);
INIT_LIST_HEAD(&server->ss_copies);
atomic_set(&server->active, 0);
server->io_stats = nfs_alloc_iostats();
if (!server->io_stats) {
kfree(server);
return NULL;
}
server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
ida_init(&server->openowner_id);
ida_init(&server->lockowner_id);
pnfs_init_server(server);
rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
return server;
}
EXPORT_SYMBOL_GPL(nfs_alloc_server);
/*
* Free up a server record
*/
void nfs_free_server(struct nfs_server *server)
{
nfs_server_remove_lists(server);
if (server->destroy != NULL)
server->destroy(server);
if (!IS_ERR(server->client_acl))
rpc_shutdown_client(server->client_acl);
if (!IS_ERR(server->client))
rpc_shutdown_client(server->client);
nfs_put_client(server->nfs_client);
if (server->kobj.state_initialized) {
nfs_sysfs_remove_server(server);
kobject_put(&server->kobj);
}
ida_free(&s_sysfs_ids, server->s_sysfs_id);
ida_destroy(&server->lockowner_id);
ida_destroy(&server->openowner_id);
nfs_free_iostats(server->io_stats);
put_cred(server->cred);
kfree(server);
nfs_release_automount_timer();
}
EXPORT_SYMBOL_GPL(nfs_free_server);
/*
* Create a version 2 or 3 volume record
* - keyed on server and FSID
*/
struct nfs_server *nfs_create_server(struct fs_context *fc)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct nfs_server *server;
struct nfs_fattr *fattr;
int error;
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
server->cred = get_cred(fc->cred);
error = -ENOMEM;
fattr = nfs_alloc_fattr();
if (fattr == NULL)
goto error;
/* Get a client representation */
error = nfs_init_server(server, fc);
if (error < 0)
goto error;
/* Probe the root fh to retrieve its FSID */
error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
if (error < 0)
goto error;
if (server->nfs_client->rpc_ops->version == 3) {
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
server->caps |= NFS_CAP_READDIRPLUS;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
server->namelen = NFS2_MAXNAMLEN;
}
if (!(fattr->valid & NFS_ATTR_FATTR)) {
error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
fattr, NULL);
if (error < 0) {
dprintk("nfs_create_server: getattr error = %d\n", -error);
goto error;
}
}
memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
dprintk("Server FSID: %llx:%llx\n",
(unsigned long long) server->fsid.major,
(unsigned long long) server->fsid.minor);
nfs_server_insert_lists(server);
server->mount_time = jiffies;
nfs_free_fattr(fattr);
return server;
error:
nfs_free_fattr(fattr);
nfs_free_server(server);
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(nfs_create_server);
/*
* 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,
rpc_authflavor_t flavor)
{
struct nfs_server *server;
int error;
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
server->cred = get_cred(source->cred);
/* Copy data from the source */
server->nfs_client = source->nfs_client;
server->destroy = source->destroy;
refcount_inc(&server->nfs_client->cl_count);
nfs_server_copy_userdata(server, source);
server->fsid = fattr->fsid;
nfs_sysfs_add_server(server);
nfs_sysfs_link_rpc_client(server,
server->nfs_client->cl_rpcclient, "_state");
error = nfs_init_server_rpcclient(server,
source->client->cl_timeout,
flavor);
if (error < 0)
goto out_free_server;
/* probe the filesystem info for this server filesystem */
error = nfs_probe_server(server, fh);
if (error < 0)
goto out_free_server;
if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
server->namelen = NFS4_MAXNAMLEN;
error = nfs_start_lockd(server);
if (error < 0)
goto out_free_server;
nfs_server_insert_lists(server);
server->mount_time = jiffies;
return server;
out_free_server:
nfs_free_server(server);
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(nfs_clone_server);
void nfs_clients_init(struct net *net)
{
struct nfs_net *nn = net_generic(net, nfs_net_id);
INIT_LIST_HEAD(&nn->nfs_client_list);
INIT_LIST_HEAD(&nn->nfs_volume_list);
#if IS_ENABLED(CONFIG_NFS_V4)
idr_init(&nn->cb_ident_idr);
#endif
spin_lock_init(&nn->nfs_client_lock);
nn->boot_time = ktime_get_real();
nfs_netns_sysfs_setup(nn, net);
}
void nfs_clients_exit(struct net *net)
{
struct nfs_net *nn = net_generic(net, nfs_net_id);
nfs_netns_sysfs_destroy(nn);
nfs_cleanup_cb_ident_idr(net);
WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
}
#ifdef CONFIG_PROC_FS
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 const 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,
};
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 const 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,
};
/*
* 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)
__acquires(&nn->nfs_client_lock)
{
struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
/* lock the list against modification */
spin_lock(&nn->nfs_client_lock);
return seq_list_start_head(&nn->nfs_client_list, *_pos);
}
/*
* move to next server
*/
static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
{
struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
return seq_list_next(v, &nn->nfs_client_list, pos);
}
/*
* clean up after reading from the transports list
*/
static void nfs_server_list_stop(struct seq_file *p, void *v)
__releases(&nn->nfs_client_lock)
{
struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
spin_unlock(&nn->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;
struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
/* display header on line 1 */
if (v == &nn->nfs_client_list) {
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);
/* Check if the client is initialized */
if (clp->cl_cons_state != NFS_CS_READY)
return 0;
rcu_read_lock();
seq_printf(m, "v%u %s %s %3d %s\n",
clp->rpc_ops->version,
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
refcount_read(&clp->cl_count),
clp->cl_hostname);
rcu_read_unlock();
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)
__acquires(&nn->nfs_client_lock)
{
struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
/* lock the list against modification */
spin_lock(&nn->nfs_client_lock);
return seq_list_start_head(&nn->nfs_volume_list, *_pos);
}
/*
* move to next volume
*/
static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
{
struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
return seq_list_next(v, &nn->nfs_volume_list, pos);
}
/*
* clean up after reading from the transports list
*/
static void nfs_volume_list_stop(struct seq_file *p, void *v)
__releases(&nn->nfs_client_lock)
{
struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
spin_unlock(&nn->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[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
/* display header on line 1 */
if (v == &nn->nfs_volume_list) {
seq_puts(m, "NV SERVER PORT DEV FSID"
" FSC\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, sizeof(dev), "%u:%u",
MAJOR(server->s_dev), MINOR(server->s_dev));
snprintf(fsid, sizeof(fsid), "%llx:%llx",
(unsigned long long) server->fsid.major,
(unsigned long long) server->fsid.minor);
rcu_read_lock();
seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
clp->rpc_ops->version,
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
dev,
fsid,
nfs_server_fscache_state(server));
rcu_read_unlock();
return 0;
}
int nfs_fs_proc_net_init(struct net *net)
{
struct nfs_net *nn = net_generic(net, nfs_net_id);
struct proc_dir_entry *p;
nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
if (!nn->proc_nfsfs)
goto error_0;
/* a file of servers with which we're dealing */
p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
&nfs_server_list_ops, sizeof(struct seq_net_private));
if (!p)
goto error_1;
/* a file of volumes that we have mounted */
p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
&nfs_volume_list_ops, sizeof(struct seq_net_private));
if (!p)
goto error_1;
return 0;
error_1:
remove_proc_subtree("nfsfs", net->proc_net);
error_0:
return -ENOMEM;
}
void nfs_fs_proc_net_exit(struct net *net)
{
remove_proc_subtree("nfsfs", net->proc_net);
}
/*
* initialise the /proc/fs/nfsfs/ directory
*/
int __init nfs_fs_proc_init(void)
{
if (!proc_mkdir("fs/nfsfs", NULL))
goto error_0;
/* a file of servers with which we're dealing */
if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
goto error_1;
/* a file of volumes that we have mounted */
if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
goto error_1;
return 0;
error_1:
remove_proc_subtree("fs/nfsfs", NULL);
error_0:
return -ENOMEM;
}
/*
* clean up the /proc/fs/nfsfs/ directory
*/
void nfs_fs_proc_exit(void)
{
remove_proc_subtree("fs/nfsfs", NULL);
ida_destroy(&s_sysfs_ids);
}
#endif /* CONFIG_PROC_FS */
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