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 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 static ctl_table nfs_cb_sysctls[] = {
  23 #ifdef CONFIG_NFS_V4
  24         {
  25                 .ctl_name = CTL_UNNUMBERED,
  26                 .procname = "nfs_callback_tcpport",
  27                 .data = &nfs_callback_set_tcpport,
  28                 .maxlen = sizeof(int),
  29                 .mode = 0644,
  30                 .proc_handler = &proc_dointvec_minmax,
  31                 .extra1 = (int *)&nfs_set_port_min,
  32                 .extra2 = (int *)&nfs_set_port_max,
  33         },
  34         {
  35                 .ctl_name = CTL_UNNUMBERED,
  36                 .procname = "idmap_cache_timeout",
  37                 .data = &nfs_idmap_cache_timeout,
  38                 .maxlen = sizeof(int),
  39                 .mode = 0644,
  40                 .proc_handler = &proc_dointvec_jiffies,
  41                 .strategy = &sysctl_jiffies,
  42         },
  43 #endif
  44         {
  45                 .ctl_name       = CTL_UNNUMBERED,
  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                 .strategy       = &sysctl_jiffies,
  52         },
  53         {
  54                 .ctl_name       = CTL_UNNUMBERED,
  55                 .procname       = "nfs_congestion_kb",
  56                 .data           = &nfs_congestion_kb,
  57                 .maxlen         = sizeof(nfs_congestion_kb),
  58                 .mode           = 0644,
  59                 .proc_handler   = &proc_dointvec,
  60         },
  61         { .ctl_name = 0 }
  62 };
  63
  64 static ctl_table nfs_cb_sysctl_dir[] = {
  65         {
  66                 .ctl_name = CTL_UNNUMBERED,
  67                 .procname = "nfs",
  68                 .mode = 0555,
  69                 .child = nfs_cb_sysctls,
  70         },
  71         { .ctl_name = 0 }
  72 };
  73
  74 static ctl_table nfs_cb_sysctl_root[] = {
  75         {
  76                 .ctl_name = CTL_FS,
  77                 .procname = "fs",
  78                 .mode = 0555,
  79                 .child = nfs_cb_sysctl_dir,
  80         },
  81         { .ctl_name = 0 }
  82 };
  83
  84 int nfs_register_sysctl(void)
  85 {
  86         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
  87         if (nfs_callback_sysctl_table == NULL)
  88                 return -ENOMEM;
  89         return 0;
  90 }
  91
  92 void nfs_unregister_sysctl(void)
  93 {
  94         unregister_sysctl_table(nfs_callback_sysctl_table);
  95         nfs_callback_sysctl_table = NULL;
  96 }