net/sunrpc/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2020 Anna Schumaker <Anna.Schumaker@Netapp.com>
   4  */
   5 #include <linux/sunrpc/clnt.h>
   6 #include <linux/kobject.h>
   7
   8 static struct kset *rpc_sunrpc_kset;
   9 static struct kobject *rpc_sunrpc_client_kobj;
  10
  11 static void rpc_sysfs_object_release(struct kobject *kobj)
  12 {
  13         kfree(kobj);
  14 }
  15
  16 static const struct kobj_ns_type_operations *
  17 rpc_sysfs_object_child_ns_type(struct kobject *kobj)
  18 {
  19         return &net_ns_type_operations;
  20 }
  21
  22 static struct kobj_type rpc_sysfs_object_type = {
  23         .release = rpc_sysfs_object_release,
  24         .sysfs_ops = &kobj_sysfs_ops,
  25         .child_ns_type = rpc_sysfs_object_child_ns_type,
  26 };
  27
  28 static struct kobject *rpc_sysfs_object_alloc(const char *name,
  29                                               struct kset *kset,
  30                                               struct kobject *parent)
  31 {
  32         struct kobject *kobj;
  33
  34         kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
  35         if (kobj) {
  36                 kobj->kset = kset;
  37                 if (kobject_init_and_add(kobj, &rpc_sysfs_object_type,
  38                                          parent, "%s", name) == 0)
  39                         return kobj;
  40                 kobject_put(kobj);
  41         }
  42         return NULL;
  43 }
  44
  45 int rpc_sysfs_init(void)
  46 {
  47         rpc_sunrpc_kset = kset_create_and_add("sunrpc", NULL, kernel_kobj);
  48         if (!rpc_sunrpc_kset)
  49                 return -ENOMEM;
  50         rpc_sunrpc_client_kobj = rpc_sysfs_object_alloc("client", rpc_sunrpc_kset, NULL);
  51         if (!rpc_sunrpc_client_kobj) {
  52                 kset_unregister(rpc_sunrpc_kset);
  53                 rpc_sunrpc_client_kobj = NULL;
  54                 return -ENOMEM;
  55         }
  56         return 0;
  57 }
  58
  59 void rpc_sysfs_exit(void)
  60 {
  61         kobject_put(rpc_sunrpc_client_kobj);
  62         kset_unregister(rpc_sunrpc_kset);
  63 }