fs/xfs/linux-2.6/xfs_sysctl.c

   1 /*
   2  * Copyright (c) 2001-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include <linux/sysctl.h>
  20 #include <linux/proc_fs.h>
  21
  22 static struct ctl_table_header *xfs_table_header;
  23
  24 #ifdef CONFIG_PROC_FS
  25 STATIC int
  26 xfs_stats_clear_proc_handler(
  27         ctl_table       *ctl,
  28         int             write,
  29         struct file     *filp,
  30         void            __user *buffer,
  31         size_t          *lenp,
  32         loff_t          *ppos)
  33 {
  34         int             c, ret, *valp = ctl->data;
  35         __uint32_t      vn_active;
  36
  37         ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);
  38
  39         if (!ret && write && *valp) {
  40                 printk("XFS Clearing xfsstats\n");
  41                 for (c = 0; c < NR_CPUS; c++) {
  42                         if (!cpu_possible(c)) continue;
  43                         preempt_disable();
  44                         /* save vn_active, it's a universal truth! */
  45                         vn_active = per_cpu(xfsstats, c).vn_active;
  46                         memset(&per_cpu(xfsstats, c), 0,
  47                                sizeof(struct xfsstats));
  48                         per_cpu(xfsstats, c).vn_active = vn_active;
  49                         preempt_enable();
  50                 }
  51                 xfs_stats_clear = 0;
  52         }
  53
  54         return ret;
  55 }
  56 #endif /* CONFIG_PROC_FS */
  57
  58 STATIC ctl_table xfs_table[] = {
  59         {XFS_RESTRICT_CHOWN, "restrict_chown", &xfs_params.restrict_chown.val,
  60         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  61         &sysctl_intvec, NULL,
  62         &xfs_params.restrict_chown.min, &xfs_params.restrict_chown.max},
  63
  64         {XFS_SGID_INHERIT, "irix_sgid_inherit", &xfs_params.sgid_inherit.val,
  65         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  66         &sysctl_intvec, NULL,
  67         &xfs_params.sgid_inherit.min, &xfs_params.sgid_inherit.max},
  68
  69         {XFS_SYMLINK_MODE, "irix_symlink_mode", &xfs_params.symlink_mode.val,
  70         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  71         &sysctl_intvec, NULL,
  72         &xfs_params.symlink_mode.min, &xfs_params.symlink_mode.max},
  73
  74         {XFS_PANIC_MASK, "panic_mask", &xfs_params.panic_mask.val,
  75         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  76         &sysctl_intvec, NULL,
  77         &xfs_params.panic_mask.min, &xfs_params.panic_mask.max},
  78
  79         {XFS_ERRLEVEL, "error_level", &xfs_params.error_level.val,
  80         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  81         &sysctl_intvec, NULL,
  82         &xfs_params.error_level.min, &xfs_params.error_level.max},
  83
  84         {XFS_SYNCD_TIMER, "xfssyncd_centisecs", &xfs_params.syncd_timer.val,
  85         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  86         &sysctl_intvec, NULL,
  87         &xfs_params.syncd_timer.min, &xfs_params.syncd_timer.max},
  88
  89         {XFS_INHERIT_SYNC, "inherit_sync", &xfs_params.inherit_sync.val,
  90         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  91         &sysctl_intvec, NULL,
  92         &xfs_params.inherit_sync.min, &xfs_params.inherit_sync.max},
  93
  94         {XFS_INHERIT_NODUMP, "inherit_nodump", &xfs_params.inherit_nodump.val,
  95         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  96         &sysctl_intvec, NULL,
  97         &xfs_params.inherit_nodump.min, &xfs_params.inherit_nodump.max},
  98
  99         {XFS_INHERIT_NOATIME, "inherit_noatime", &xfs_params.inherit_noatim.val,
 100         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 101         &sysctl_intvec, NULL,
 102         &xfs_params.inherit_noatim.min, &xfs_params.inherit_noatim.max},
 103
 104         {XFS_BUF_TIMER, "xfsbufd_centisecs", &xfs_params.xfs_buf_timer.val,
 105         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 106         &sysctl_intvec, NULL,
 107         &xfs_params.xfs_buf_timer.min, &xfs_params.xfs_buf_timer.max},
 108
 109         {XFS_BUF_AGE, "age_buffer_centisecs", &xfs_params.xfs_buf_age.val,
 110         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 111         &sysctl_intvec, NULL,
 112         &xfs_params.xfs_buf_age.min, &xfs_params.xfs_buf_age.max},
 113
 114         {XFS_INHERIT_NOSYM, "inherit_nosymlinks", &xfs_params.inherit_nosym.val,
 115         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 116         &sysctl_intvec, NULL,
 117         &xfs_params.inherit_nosym.min, &xfs_params.inherit_nosym.max},
 118
 119         {XFS_ROTORSTEP, "rotorstep", &xfs_params.rotorstep.val,
 120         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 121         &sysctl_intvec, NULL,
 122         &xfs_params.rotorstep.min, &xfs_params.rotorstep.max},
 123
 124         /* please keep this the last entry */
 125 #ifdef CONFIG_PROC_FS
 126         {XFS_STATS_CLEAR, "stats_clear", &xfs_params.stats_clear.val,
 127         sizeof(int), 0644, NULL, &xfs_stats_clear_proc_handler,
 128         &sysctl_intvec, NULL,
 129         &xfs_params.stats_clear.min, &xfs_params.stats_clear.max},
 130 #endif /* CONFIG_PROC_FS */
 131
 132         {0}
 133 };
 134
 135 STATIC ctl_table xfs_dir_table[] = {
 136         {FS_XFS, "xfs", NULL, 0, 0555, xfs_table},
 137         {0}
 138 };
 139
 140 STATIC ctl_table xfs_root_table[] = {
 141         {CTL_FS, "fs",  NULL, 0, 0555, xfs_dir_table},
 142         {0}
 143 };
 144
 145 void
 146 xfs_sysctl_register(void)
 147 {
 148         xfs_table_header = register_sysctl_table(xfs_root_table, 1);
 149 }
 150
 151 void
 152 xfs_sysctl_unregister(void)
 153 {
 154         if (xfs_table_header)
 155                 unregister_sysctl_table(xfs_table_header);
 156 }