fs/nfs/sysctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/nfs/sysctl.c
   4  *
   5  * Sysctl interface to NFS parameters
   6  */
   7 #include <linux/types.h>
   8 #include <linux/linkage.h>
   9 #include <linux/ctype.h>
  10 #include <linux/fs.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/module.h>
  13 #include <linux/nfs_fs.h>
  14
  15 static struct ctl_table_header *nfs_callback_sysctl_table;
  16
  17 static struct ctl_table nfs_cb_sysctls[] = {
  18         {
  19                 .procname       = "nfs_mountpoint_timeout",
  20                 .data           = &nfs_mountpoint_expiry_timeout,
  21                 .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
  22                 .mode           = 0644,
  23                 .proc_handler   = proc_dointvec_jiffies,
  24         },
  25         {
  26                 .procname       = "nfs_congestion_kb",
  27                 .data           = &nfs_congestion_kb,
  28                 .maxlen         = sizeof(nfs_congestion_kb),
  29                 .mode           = 0644,
  30                 .proc_handler   = proc_dointvec,
  31         },
  32         { }
  33 };
  34
  35 static struct ctl_table nfs_cb_sysctl_dir[] = {
  36         {
  37                 .procname = "nfs",
  38                 .mode = 0555,
  39                 .child = nfs_cb_sysctls,
  40         },
  41         { }
  42 };
  43
  44 static struct ctl_table nfs_cb_sysctl_root[] = {
  45         {
  46                 .procname = "fs",
  47                 .mode = 0555,
  48                 .child = nfs_cb_sysctl_dir,
  49         },
  50         { }
  51 };
  52
  53 int nfs_register_sysctl(void)
  54 {
  55         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
  56         if (nfs_callback_sysctl_table == NULL)
  57                 return -ENOMEM;
  58         return 0;
  59 }
  60
  61 void nfs_unregister_sysctl(void)
  62 {
  63         unregister_sysctl_table(nfs_callback_sysctl_table);
  64         nfs_callback_sysctl_table = NULL;
  65 }