fs/nfs/sysctl.c

   1 /*
   2  * linux/fs/nfs/sysctl.c
   3  *
   4  * Sysctl interface to NFS parameters
   5  */
   6 #include <linux/types.h>
   7 #include <linux/linkage.h>
   8 #include <linux/ctype.h>
   9 #include <linux/fs.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/module.h>
  12 #include <linux/nfs4.h>
  13 #include <linux/nfs_idmap.h>
  14 #include <linux/nfs_fs.h>
  15
  16 #include "callback.h"
  17
  18 #ifdef CONFIG_NFS_V4
  19 static const int nfs_set_port_min = 0;
  20 static const int nfs_set_port_max = 65535;
  21 #endif
  22 static struct ctl_table_header *nfs_callback_sysctl_table;
  23
  24 static ctl_table nfs_cb_sysctls[] = {
  25 #ifdef CONFIG_NFS_V4
  26         {
  27                 .procname = "nfs_callback_tcpport",
  28                 .data = &nfs_callback_set_tcpport,
  29                 .maxlen = sizeof(int),
  30                 .mode = 0644,
  31                 .proc_handler = proc_dointvec_minmax,
  32                 .extra1 = (int *)&nfs_set_port_min,
  33                 .extra2 = (int *)&nfs_set_port_max,
  34         },
  35 #ifndef CONFIG_NFS_USE_NEW_IDMAPPER
  36         {
  37                 .procname = "idmap_cache_timeout",
  38                 .data = &nfs_idmap_cache_timeout,
  39                 .maxlen = sizeof(int),
  40                 .mode = 0644,
  41                 .proc_handler = proc_dointvec_jiffies,
  42         },
  43 #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
  44 #endif
  45         {
  46                 .procname       = "nfs_mountpoint_timeout",
  47                 .data           = &nfs_mountpoint_expiry_timeout,
  48                 .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
  49                 .mode           = 0644,
  50                 .proc_handler   = proc_dointvec_jiffies,
  51         },
  52         {
  53                 .procname       = "nfs_congestion_kb",
  54                 .data           = &nfs_congestion_kb,
  55                 .maxlen         = sizeof(nfs_congestion_kb),
  56                 .mode           = 0644,
  57                 .proc_handler   = proc_dointvec,
  58         },
  59         { }
  60 };
  61
  62 static ctl_table nfs_cb_sysctl_dir[] = {
  63         {
  64                 .procname = "nfs",
  65                 .mode = 0555,
  66                 .child = nfs_cb_sysctls,
  67         },
  68         { }
  69 };
  70
  71 static ctl_table nfs_cb_sysctl_root[] = {
  72         {
  73                 .procname = "fs",
  74                 .mode = 0555,
  75                 .child = nfs_cb_sysctl_dir,
  76         },
  77         { }
  78 };
  79
  80 int nfs_register_sysctl(void)
  81 {
  82         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
  83         if (nfs_callback_sysctl_table == NULL)
  84                 return -ENOMEM;
  85         return 0;
  86 }
  87
  88 void nfs_unregister_sysctl(void)
  89 {
  90         unregister_sysctl_table(nfs_callback_sysctl_table);
  91         nfs_callback_sysctl_table = NULL;
  92 }