2019-01-24 21:10:46 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
|
|
* Copyright (c) 2019 Hammerspace Inc
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kobject.h>
|
|
|
|
#include <linux/sysfs.h>
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/netdevice.h>
|
2019-01-30 02:40:10 +00:00
|
|
|
#include <linux/string.h>
|
|
|
|
#include <linux/nfs_fs.h>
|
|
|
|
#include <linux/rcupdate.h>
|
2019-01-24 21:10:46 +00:00
|
|
|
|
2019-01-30 02:40:10 +00:00
|
|
|
#include "nfs4_fs.h"
|
|
|
|
#include "netns.h"
|
2019-01-24 21:10:46 +00:00
|
|
|
#include "sysfs.h"
|
|
|
|
|
|
|
|
struct kobject *nfs_client_kobj;
|
|
|
|
static struct kset *nfs_client_kset;
|
|
|
|
|
|
|
|
static void nfs_netns_object_release(struct kobject *kobj)
|
|
|
|
{
|
|
|
|
kfree(kobj);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct kobj_ns_type_operations *nfs_netns_object_child_ns_type(
|
|
|
|
struct kobject *kobj)
|
|
|
|
{
|
|
|
|
return &net_ns_type_operations;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct kobj_type nfs_netns_object_type = {
|
|
|
|
.release = nfs_netns_object_release,
|
|
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
|
|
.child_ns_type = nfs_netns_object_child_ns_type,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct kobject *nfs_netns_object_alloc(const char *name,
|
|
|
|
struct kset *kset, struct kobject *parent)
|
|
|
|
{
|
|
|
|
struct kobject *kobj;
|
|
|
|
|
|
|
|
kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
|
|
|
|
if (kobj) {
|
|
|
|
kobj->kset = kset;
|
|
|
|
if (kobject_init_and_add(kobj, &nfs_netns_object_type,
|
|
|
|
parent, "%s", name) == 0)
|
|
|
|
return kobj;
|
|
|
|
kobject_put(kobj);
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
int nfs_sysfs_init(void)
|
|
|
|
{
|
|
|
|
nfs_client_kset = kset_create_and_add("nfs", NULL, fs_kobj);
|
|
|
|
if (!nfs_client_kset)
|
|
|
|
return -ENOMEM;
|
|
|
|
nfs_client_kobj = nfs_netns_object_alloc("net", nfs_client_kset, NULL);
|
|
|
|
if (!nfs_client_kobj) {
|
|
|
|
kset_unregister(nfs_client_kset);
|
|
|
|
nfs_client_kset = NULL;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void nfs_sysfs_exit(void)
|
|
|
|
{
|
|
|
|
kobject_put(nfs_client_kobj);
|
|
|
|
kset_unregister(nfs_client_kset);
|
|
|
|
}
|
2019-01-30 02:40:10 +00:00
|
|
|
|
|
|
|
static ssize_t nfs_netns_identifier_show(struct kobject *kobj,
|
|
|
|
struct kobj_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *c = container_of(kobj,
|
|
|
|
struct nfs_netns_client,
|
|
|
|
kobject);
|
2020-10-14 19:22:11 +00:00
|
|
|
ssize_t ret;
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
ret = scnprintf(buf, PAGE_SIZE, "%s\n", rcu_dereference(c->identifier));
|
|
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
2019-01-30 02:40:10 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Strip trailing '\n' */
|
|
|
|
static size_t nfs_string_strip(const char *c, size_t len)
|
|
|
|
{
|
|
|
|
while (len > 0 && c[len-1] == '\n')
|
|
|
|
--len;
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t nfs_netns_identifier_store(struct kobject *kobj,
|
|
|
|
struct kobj_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *c = container_of(kobj,
|
|
|
|
struct nfs_netns_client,
|
|
|
|
kobject);
|
|
|
|
const char *old;
|
|
|
|
char *p;
|
|
|
|
size_t len;
|
|
|
|
|
|
|
|
len = nfs_string_strip(buf, min_t(size_t, count, CONTAINER_ID_MAXLEN));
|
|
|
|
if (!len)
|
|
|
|
return 0;
|
|
|
|
p = kmemdup_nul(buf, len, GFP_KERNEL);
|
|
|
|
if (!p)
|
|
|
|
return -ENOMEM;
|
2020-10-14 19:22:11 +00:00
|
|
|
old = rcu_dereference_protected(xchg(&c->identifier, (char __rcu *)p), 1);
|
2019-01-30 02:40:10 +00:00
|
|
|
if (old) {
|
|
|
|
synchronize_rcu();
|
|
|
|
kfree(old);
|
|
|
|
}
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nfs_netns_client_release(struct kobject *kobj)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *c = container_of(kobj,
|
|
|
|
struct nfs_netns_client,
|
|
|
|
kobject);
|
|
|
|
|
2020-10-14 19:22:11 +00:00
|
|
|
kfree(rcu_dereference_raw(c->identifier));
|
2019-01-30 02:40:10 +00:00
|
|
|
kfree(c);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const void *nfs_netns_client_namespace(struct kobject *kobj)
|
|
|
|
{
|
|
|
|
return container_of(kobj, struct nfs_netns_client, kobject)->net;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct kobj_attribute nfs_netns_client_id = __ATTR(identifier,
|
|
|
|
0644, nfs_netns_identifier_show, nfs_netns_identifier_store);
|
|
|
|
|
|
|
|
static struct attribute *nfs_netns_client_attrs[] = {
|
|
|
|
&nfs_netns_client_id.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
2021-12-28 14:41:38 +00:00
|
|
|
ATTRIBUTE_GROUPS(nfs_netns_client);
|
2019-01-30 02:40:10 +00:00
|
|
|
|
|
|
|
static struct kobj_type nfs_netns_client_type = {
|
|
|
|
.release = nfs_netns_client_release,
|
2021-12-28 14:41:38 +00:00
|
|
|
.default_groups = nfs_netns_client_groups,
|
2019-01-30 02:40:10 +00:00
|
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
|
|
.namespace = nfs_netns_client_namespace,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
|
|
|
|
struct net *net)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *p;
|
|
|
|
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
|
|
if (p) {
|
|
|
|
p->net = net;
|
|
|
|
p->kobject.kset = nfs_client_kset;
|
|
|
|
if (kobject_init_and_add(&p->kobject, &nfs_netns_client_type,
|
|
|
|
parent, "nfs_client") == 0)
|
|
|
|
return p;
|
|
|
|
kobject_put(&p->kobject);
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *clp;
|
|
|
|
|
|
|
|
clp = nfs_netns_client_alloc(nfs_client_kobj, net);
|
|
|
|
if (clp) {
|
|
|
|
netns->nfs_client = clp;
|
|
|
|
kobject_uevent(&clp->kobject, KOBJ_ADD);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void nfs_netns_sysfs_destroy(struct nfs_net *netns)
|
|
|
|
{
|
|
|
|
struct nfs_netns_client *clp = netns->nfs_client;
|
|
|
|
|
|
|
|
if (clp) {
|
|
|
|
kobject_uevent(&clp->kobject, KOBJ_REMOVE);
|
|
|
|
kobject_del(&clp->kobject);
|
|
|
|
kobject_put(&clp->kobject);
|
|
|
|
netns->nfs_client = NULL;
|
|
|
|
}
|
|
|
|
}
|