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- // 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>
- #include <linux/string.h>
- #include <linux/nfs_fs.h>
- #include <linux/rcupdate.h>
- #include "nfs4_fs.h"
- #include "netns.h"
- #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);
- }
- 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);
- ssize_t ret;
- rcu_read_lock();
- ret = scnprintf(buf, PAGE_SIZE, "%s\n", rcu_dereference(c->identifier));
- rcu_read_unlock();
- return ret;
- }
- /* 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;
- old = rcu_dereference_protected(xchg(&c->identifier, (char __rcu *)p), 1);
- 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);
- kfree(rcu_dereference_raw(c->identifier));
- 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,
- };
- static struct kobj_type nfs_netns_client_type = {
- .release = nfs_netns_client_release,
- .default_attrs = nfs_netns_client_attrs,
- .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;
- }
- }
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