sysctl.c 2.3 KB

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  1. /*
  2. * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
  3. * the Linux-NTFS project. Adapted from the old NTFS driver,
  4. * Copyright (C) 1997 Martin von Löwis, Régis Duchesne
  5. *
  6. * Copyright (c) 2002-2005 Anton Altaparmakov
  7. *
  8. * This program/include file is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as published
  10. * by the Free Software Foundation; either version 2 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * This program/include file is distributed in the hope that it will be
  14. * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15. * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program (in the main directory of the Linux-NTFS
  20. * distribution in the file COPYING); if not, write to the Free Software
  21. * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22. */
  23. #ifdef DEBUG
  24. #include <linux/module.h>
  25. #ifdef CONFIG_SYSCTL
  26. #include <linux/proc_fs.h>
  27. #include <linux/sysctl.h>
  28. #include "sysctl.h"
  29. #include "debug.h"
  30. /* Definition of the ntfs sysctl. */
  31. static ctl_table ntfs_sysctls[] = {
  32. {
  33. .ctl_name = CTL_UNNUMBERED, /* Binary and text IDs. */
  34. .procname = "ntfs-debug",
  35. .data = &debug_msgs, /* Data pointer and size. */
  36. .maxlen = sizeof(debug_msgs),
  37. .mode = 0644, /* Mode, proc handler. */
  38. .proc_handler = &proc_dointvec
  39. },
  40. {}
  41. };
  42. /* Define the parent directory /proc/sys/fs. */
  43. static ctl_table sysctls_root[] = {
  44. {
  45. .ctl_name = CTL_FS,
  46. .procname = "fs",
  47. .mode = 0555,
  48. .child = ntfs_sysctls
  49. },
  50. {}
  51. };
  52. /* Storage for the sysctls header. */
  53. static struct ctl_table_header *sysctls_root_table = NULL;
  54. /**
  55. * ntfs_sysctl - add or remove the debug sysctl
  56. * @add: add (1) or remove (0) the sysctl
  57. *
  58. * Add or remove the debug sysctl. Return 0 on success or -errno on error.
  59. */
  60. int ntfs_sysctl(int add)
  61. {
  62. if (add) {
  63. BUG_ON(sysctls_root_table);
  64. sysctls_root_table = register_sysctl_table(sysctls_root);
  65. if (!sysctls_root_table)
  66. return -ENOMEM;
  67. } else {
  68. BUG_ON(!sysctls_root_table);
  69. unregister_sysctl_table(sysctls_root_table);
  70. sysctls_root_table = NULL;
  71. }
  72. return 0;
  73. }
  74. #endif /* CONFIG_SYSCTL */
  75. #endif /* DEBUG */