mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 12:06:42 +07:00
9f7761cf04
Don't bail out before cleaning up a new allocation if the wait for
searching for a matching nfs client is interrupted. Memory leaks.
Reported-by: syzbot+7fe11b49c1cc30e3fce2@syzkaller.appspotmail.com
Fixes: 950a578c61
("NFS: make nfs_match_client killable")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
1325 lines
33 KiB
C
1325 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* client.c: NFS client sharing and management code
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*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/stats.h>
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#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>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/lockd/bind.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/vfs.h>
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#include <linux/inet.h>
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#include <linux/in6.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <net/ipv6.h>
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#include <linux/nfs_xdr.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include <linux/nsproxy.h>
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#include <linux/pid_namespace.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#include "internal.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfs.h"
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#include "netns.h"
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#include "sysfs.h"
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#define NFSDBG_FACILITY NFSDBG_CLIENT
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static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
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static DEFINE_SPINLOCK(nfs_version_lock);
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static DEFINE_MUTEX(nfs_version_mutex);
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static LIST_HEAD(nfs_versions);
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/*
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* RPC cruft for NFS
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*/
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static const struct rpc_version *nfs_version[5] = {
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[2] = NULL,
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[3] = NULL,
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[4] = NULL,
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};
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const struct rpc_program nfs_program = {
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.name = "nfs",
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.number = NFS_PROGRAM,
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.nrvers = ARRAY_SIZE(nfs_version),
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.version = nfs_version,
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.stats = &nfs_rpcstat,
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.pipe_dir_name = NFS_PIPE_DIRNAME,
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};
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struct rpc_stat nfs_rpcstat = {
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.program = &nfs_program
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};
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static struct nfs_subversion *find_nfs_version(unsigned int version)
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{
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struct nfs_subversion *nfs;
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spin_lock(&nfs_version_lock);
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list_for_each_entry(nfs, &nfs_versions, list) {
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if (nfs->rpc_ops->version == version) {
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spin_unlock(&nfs_version_lock);
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return nfs;
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}
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}
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spin_unlock(&nfs_version_lock);
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return ERR_PTR(-EPROTONOSUPPORT);
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}
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struct nfs_subversion *get_nfs_version(unsigned int version)
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{
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struct nfs_subversion *nfs = find_nfs_version(version);
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if (IS_ERR(nfs)) {
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mutex_lock(&nfs_version_mutex);
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request_module("nfsv%d", version);
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nfs = find_nfs_version(version);
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mutex_unlock(&nfs_version_mutex);
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}
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if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
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return ERR_PTR(-EAGAIN);
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return nfs;
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}
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void put_nfs_version(struct nfs_subversion *nfs)
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{
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module_put(nfs->owner);
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}
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void register_nfs_version(struct nfs_subversion *nfs)
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{
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spin_lock(&nfs_version_lock);
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list_add(&nfs->list, &nfs_versions);
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nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
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spin_unlock(&nfs_version_lock);
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}
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EXPORT_SYMBOL_GPL(register_nfs_version);
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void unregister_nfs_version(struct nfs_subversion *nfs)
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{
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spin_lock(&nfs_version_lock);
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nfs_version[nfs->rpc_ops->version] = NULL;
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list_del(&nfs->list);
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spin_unlock(&nfs_version_lock);
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}
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EXPORT_SYMBOL_GPL(unregister_nfs_version);
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/*
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* Allocate a shared client record
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*
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* Since these are allocated/deallocated very rarely, we don't
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* bother putting them in a slab cache...
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*/
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struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
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{
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struct nfs_client *clp;
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int err = -ENOMEM;
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if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
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goto error_0;
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clp->cl_nfs_mod = cl_init->nfs_mod;
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if (!try_module_get(clp->cl_nfs_mod->owner))
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goto error_dealloc;
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clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
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refcount_set(&clp->cl_count, 1);
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clp->cl_cons_state = NFS_CS_INITING;
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memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
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clp->cl_addrlen = cl_init->addrlen;
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if (cl_init->hostname) {
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err = -ENOMEM;
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clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
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if (!clp->cl_hostname)
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goto error_cleanup;
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}
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INIT_LIST_HEAD(&clp->cl_superblocks);
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clp->cl_rpcclient = ERR_PTR(-EINVAL);
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clp->cl_proto = cl_init->proto;
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clp->cl_nconnect = cl_init->nconnect;
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clp->cl_net = get_net(cl_init->net);
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clp->cl_principal = "*";
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nfs_fscache_get_client_cookie(clp);
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return clp;
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error_cleanup:
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put_nfs_version(clp->cl_nfs_mod);
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error_dealloc:
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kfree(clp);
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error_0:
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(nfs_alloc_client);
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#if IS_ENABLED(CONFIG_NFS_V4)
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static void nfs_cleanup_cb_ident_idr(struct net *net)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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idr_destroy(&nn->cb_ident_idr);
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}
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/* nfs_client_lock held */
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static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
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{
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struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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if (clp->cl_cb_ident)
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idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
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}
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static void pnfs_init_server(struct nfs_server *server)
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{
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rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
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}
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#else
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static void nfs_cleanup_cb_ident_idr(struct net *net)
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{
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}
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static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
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{
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}
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static void pnfs_init_server(struct nfs_server *server)
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{
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}
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#endif /* CONFIG_NFS_V4 */
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/*
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* Destroy a shared client record
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*/
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void nfs_free_client(struct nfs_client *clp)
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{
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nfs_fscache_release_client_cookie(clp);
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/* -EIO all pending I/O */
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if (!IS_ERR(clp->cl_rpcclient))
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rpc_shutdown_client(clp->cl_rpcclient);
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put_net(clp->cl_net);
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put_nfs_version(clp->cl_nfs_mod);
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kfree(clp->cl_hostname);
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kfree(clp->cl_acceptor);
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kfree(clp);
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}
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EXPORT_SYMBOL_GPL(nfs_free_client);
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/*
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* Release a reference to a shared client record
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*/
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void nfs_put_client(struct nfs_client *clp)
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{
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struct nfs_net *nn;
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if (!clp)
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return;
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nn = net_generic(clp->cl_net, nfs_net_id);
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if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
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list_del(&clp->cl_share_link);
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nfs_cb_idr_remove_locked(clp);
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spin_unlock(&nn->nfs_client_lock);
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WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
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clp->rpc_ops->free_client(clp);
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}
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}
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EXPORT_SYMBOL_GPL(nfs_put_client);
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/*
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* Find an nfs_client on the list that matches the initialisation data
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* 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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{
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struct nfs_client *clp;
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const struct sockaddr *sap = data->addr;
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struct nfs_net *nn = net_generic(data->net, nfs_net_id);
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int error;
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again:
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list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
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const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
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/* Don't match clients that failed to initialise properly */
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if (clp->cl_cons_state < 0)
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continue;
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/* If a client is still initializing then we need to wait */
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if (clp->cl_cons_state > NFS_CS_READY) {
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refcount_inc(&clp->cl_count);
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spin_unlock(&nn->nfs_client_lock);
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error = nfs_wait_client_init_complete(clp);
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nfs_put_client(clp);
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spin_lock(&nn->nfs_client_lock);
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if (error < 0)
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return ERR_PTR(error);
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goto again;
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}
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/* Different NFS versions cannot share the same nfs_client */
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if (clp->rpc_ops != data->nfs_mod->rpc_ops)
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continue;
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if (clp->cl_proto != data->proto)
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continue;
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/* Match nfsv4 minorversion */
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if (clp->cl_minorversion != data->minorversion)
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continue;
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/* Match the full socket address */
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if (!rpc_cmp_addr_port(sap, clap))
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/* Match all xprt_switch full socket addresses */
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if (IS_ERR(clp->cl_rpcclient) ||
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!rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
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sap))
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continue;
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refcount_inc(&clp->cl_count);
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return clp;
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}
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return NULL;
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}
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/*
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* Return true if @clp is done initializing, false if still working on it.
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*
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* Use nfs_client_init_status to check if it was successful.
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*/
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bool nfs_client_init_is_complete(const struct nfs_client *clp)
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{
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return clp->cl_cons_state <= NFS_CS_READY;
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}
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EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
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/*
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* Return 0 if @clp was successfully initialized, -errno otherwise.
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*
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* This must be called *after* nfs_client_init_is_complete() returns true,
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* otherwise it will pop WARN_ON_ONCE and return -EINVAL
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*/
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int nfs_client_init_status(const struct nfs_client *clp)
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{
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/* called without checking nfs_client_init_is_complete */
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if (clp->cl_cons_state > NFS_CS_READY) {
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WARN_ON_ONCE(1);
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return -EINVAL;
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}
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return clp->cl_cons_state;
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}
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EXPORT_SYMBOL_GPL(nfs_client_init_status);
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int nfs_wait_client_init_complete(const struct nfs_client *clp)
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{
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return wait_event_killable(nfs_client_active_wq,
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nfs_client_init_is_complete(clp));
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}
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EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
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/*
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* Found an existing client. Make sure it's ready before returning.
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*/
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static struct nfs_client *
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nfs_found_client(const struct nfs_client_initdata *cl_init,
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struct nfs_client *clp)
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{
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int error;
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error = nfs_wait_client_init_complete(clp);
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if (error < 0) {
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nfs_put_client(clp);
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return ERR_PTR(-ERESTARTSYS);
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}
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if (clp->cl_cons_state < NFS_CS_READY) {
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error = clp->cl_cons_state;
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nfs_put_client(clp);
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return ERR_PTR(error);
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}
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smp_rmb();
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return clp;
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}
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/*
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* Look up a client by IP address and protocol version
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* - creates a new record if one doesn't yet exist
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*/
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struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
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{
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struct nfs_client *clp, *new = NULL;
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struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
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const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
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if (cl_init->hostname == NULL) {
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WARN_ON(1);
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return NULL;
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}
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/* see if the client already exists */
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do {
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spin_lock(&nn->nfs_client_lock);
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clp = nfs_match_client(cl_init);
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if (clp) {
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spin_unlock(&nn->nfs_client_lock);
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if (new)
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new->rpc_ops->free_client(new);
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if (IS_ERR(clp))
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return clp;
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return nfs_found_client(cl_init, clp);
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}
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if (new) {
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list_add_tail(&new->cl_share_link,
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&nn->nfs_client_list);
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spin_unlock(&nn->nfs_client_lock);
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new->cl_flags = cl_init->init_flags;
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return rpc_ops->init_client(new, cl_init);
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}
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spin_unlock(&nn->nfs_client_lock);
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new = rpc_ops->alloc_client(cl_init);
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} while (!IS_ERR(new));
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return new;
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}
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EXPORT_SYMBOL_GPL(nfs_get_client);
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/*
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* Mark a server as ready or failed
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*/
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void nfs_mark_client_ready(struct nfs_client *clp, int state)
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{
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smp_wmb();
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clp->cl_cons_state = state;
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wake_up_all(&nfs_client_active_wq);
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}
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EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
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/*
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* Initialise the timeout values for a connection
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*/
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void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
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int timeo, int retrans)
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{
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to->to_initval = timeo * HZ / 10;
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to->to_retries = retrans;
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switch (proto) {
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case XPRT_TRANSPORT_TCP:
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case XPRT_TRANSPORT_RDMA:
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if (retrans == NFS_UNSPEC_RETRANS)
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to->to_retries = NFS_DEF_TCP_RETRANS;
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if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
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to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
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if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
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to->to_initval = NFS_MAX_TCP_TIMEOUT;
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to->to_increment = to->to_initval;
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to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
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if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
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to->to_maxval = NFS_MAX_TCP_TIMEOUT;
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if (to->to_maxval < to->to_initval)
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to->to_maxval = to->to_initval;
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to->to_exponential = 0;
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break;
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case XPRT_TRANSPORT_UDP:
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if (retrans == NFS_UNSPEC_RETRANS)
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to->to_retries = NFS_DEF_UDP_RETRANS;
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if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
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to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
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if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
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to->to_initval = NFS_MAX_UDP_TIMEOUT;
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to->to_maxval = NFS_MAX_UDP_TIMEOUT;
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to->to_exponential = 1;
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break;
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
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|
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/*
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* Create an RPC client handle
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*/
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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,
|
|
};
|
|
|
|
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 (!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;
|
|
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 = current_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;
|
|
case XPRT_TRANSPORT_UDP:
|
|
nlm_init.protocol = IPPROTO_UDP;
|
|
}
|
|
|
|
host = nlmclnt_init(&nlm_init);
|
|
if (IS_ERR(host))
|
|
return PTR_ERR(host);
|
|
|
|
server->nlm_host = host;
|
|
server->destroy = nfs_destroy_server;
|
|
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;
|
|
|
|
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 nfs_parsed_mount_data *data,
|
|
struct nfs_subversion *nfs_mod)
|
|
{
|
|
struct rpc_timeout timeparms;
|
|
struct nfs_client_initdata cl_init = {
|
|
.hostname = data->nfs_server.hostname,
|
|
.addr = (const struct sockaddr *)&data->nfs_server.address,
|
|
.addrlen = data->nfs_server.addrlen,
|
|
.nfs_mod = nfs_mod,
|
|
.proto = data->nfs_server.protocol,
|
|
.net = data->net,
|
|
.timeparms = &timeparms,
|
|
.cred = server->cred,
|
|
.nconnect = data->nfs_server.nconnect,
|
|
};
|
|
struct nfs_client *clp;
|
|
int error;
|
|
|
|
nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
|
|
data->timeo, data->retrans);
|
|
if (data->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;
|
|
|
|
/* Initialise the client representation from the mount data */
|
|
server->flags = data->flags;
|
|
server->options = data->options;
|
|
server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
|
|
NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
|
|
NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
|
|
|
|
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;
|
|
server->auth_info = data->auth_info;
|
|
|
|
error = nfs_init_server_rpcclient(server, &timeparms,
|
|
data->selected_flavor);
|
|
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;
|
|
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)
|
|
{
|
|
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_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 > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
|
|
server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
|
|
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->clone_blksize = fsinfo->clone_blksize;
|
|
/* 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
|
|
*/
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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->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;
|
|
}
|
|
|
|
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);
|
|
|
|
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 nfs_mount_info *mount_info,
|
|
struct nfs_subversion *nfs_mod)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs_fattr *fattr;
|
|
int error;
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
server->cred = get_cred(current_cred());
|
|
|
|
error = -ENOMEM;
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL)
|
|
goto error;
|
|
|
|
/* Get a client representation */
|
|
error = nfs_init_server(server, mount_info->parsed, nfs_mod);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
/* Probe the root fh to retrieve its FSID */
|
|
error = nfs_probe_fsinfo(server, mount_info->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 (!(mount_info->parsed->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 = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh,
|
|
fattr, NULL, 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;
|
|
struct nfs_fattr *fattr_fsinfo;
|
|
int error;
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
server->cred = get_cred(source->cred);
|
|
|
|
error = -ENOMEM;
|
|
fattr_fsinfo = nfs_alloc_fattr();
|
|
if (fattr_fsinfo == NULL)
|
|
goto out_free_server;
|
|
|
|
/* 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;
|
|
|
|
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_fsinfo(server, fh, fattr_fsinfo);
|
|
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;
|
|
|
|
nfs_free_fattr(fattr_fsinfo);
|
|
return server;
|
|
|
|
out_free_server:
|
|
nfs_free_fattr(fattr_fsinfo);
|
|
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);
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|