fs/nfs/sysctl.c

   1 /*
   2  * linux/fs/nfs/sysctl.c
   3  *
   4  * Sysctl interface to NFS parameters
   5  */
   6 #include <linux/config.h>
   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/nfs4.h>
  14 #include <linux/nfs_idmap.h>
  15
  16 #include "callback.h"
  17
  18 static const int nfs_set_port_min = 0;
  19 static const int nfs_set_port_max = 65535;
  20 static struct ctl_table_header *nfs_callback_sysctl_table;
  21 /*
  22  * Something that isn't CTL_ANY, CTL_NONE or a value that may clash.
  23  * Use the same values as fs/lockd/svc.c
  24  */
  25 #define CTL_UNNUMBERED -2
  26
  27 static ctl_table nfs_cb_sysctls[] = {
  28 #ifdef CONFIG_NFS_V4
  29         {
  30                 .ctl_name = CTL_UNNUMBERED,
  31                 .procname = "nfs_callback_tcpport",
  32                 .data = &nfs_callback_set_tcpport,
  33                 .maxlen = sizeof(int),
  34                 .mode = 0644,
  35                 .proc_handler = &proc_dointvec_minmax,
  36                 .extra1 = (int *)&nfs_set_port_min,
  37                 .extra2 = (int *)&nfs_set_port_max,
  38         },
  39         {
  40                 .ctl_name = CTL_UNNUMBERED,
  41                 .procname = "idmap_cache_timeout",
  42                 .data = &nfs_idmap_cache_timeout,
  43                 .maxlen = sizeof(int),
  44                 .mode = 0644,
  45                 .proc_handler = &proc_dointvec_jiffies,
  46                 .strategy = &sysctl_jiffies,
  47         },
  48 #endif
  49         { .ctl_name = 0 }
  50 };
  51
  52 static ctl_table nfs_cb_sysctl_dir[] = {
  53         {
  54                 .ctl_name = CTL_UNNUMBERED,
  55                 .procname = "nfs",
  56                 .mode = 0555,
  57                 .child = nfs_cb_sysctls,
  58         },
  59         { .ctl_name = 0 }
  60 };
  61
  62 static ctl_table nfs_cb_sysctl_root[] = {
  63         {
  64                 .ctl_name = CTL_FS,
  65                 .procname = "fs",
  66                 .mode = 0555,
  67                 .child = nfs_cb_sysctl_dir,
  68         },
  69         { .ctl_name = 0 }
  70 };
  71
  72 int nfs_register_sysctl(void)
  73 {
  74         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root, 0);
  75         if (nfs_callback_sysctl_table == NULL)
  76                 return -ENOMEM;
  77         return 0;
  78 }
  79
  80 void nfs_unregister_sysctl(void)
  81 {
  82         unregister_sysctl_table(nfs_callback_sysctl_table);
  83         nfs_callback_sysctl_table = NULL;
  84 }