fs/xfs/linux-2.6/xfs_sysctl.c

   1 /*
   2  * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #include "xfs.h"
  33 #include <linux/sysctl.h>
  34 #include <linux/proc_fs.h>
  35
  36
  37 static struct ctl_table_header *xfs_table_header;
  38
  39
  40 #ifdef CONFIG_PROC_FS
  41 STATIC int
  42 xfs_stats_clear_proc_handler(
  43         ctl_table       *ctl,
  44         int             write,
  45         struct file     *filp,
  46         void            __user *buffer,
  47         size_t          *lenp,
  48         loff_t          *ppos)
  49 {
  50         int             c, ret, *valp = ctl->data;
  51         __uint32_t      vn_active;
  52
  53         ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);
  54
  55         if (!ret && write && *valp) {
  56                 printk("XFS Clearing xfsstats\n");
  57                 for (c = 0; c < NR_CPUS; c++) {
  58                         if (!cpu_possible(c)) continue;
  59                         preempt_disable();
  60                         /* save vn_active, it's a universal truth! */
  61                         vn_active = per_cpu(xfsstats, c).vn_active;
  62                         memset(&per_cpu(xfsstats, c), 0,
  63                                sizeof(struct xfsstats));
  64                         per_cpu(xfsstats, c).vn_active = vn_active;
  65                         preempt_enable();
  66                 }
  67                 xfs_stats_clear = 0;
  68         }
  69
  70         return ret;
  71 }
  72 #endif /* CONFIG_PROC_FS */
  73
  74 STATIC ctl_table xfs_table[] = {
  75         {XFS_RESTRICT_CHOWN, "restrict_chown", &xfs_params.restrict_chown.val,
  76         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  77         &sysctl_intvec, NULL,
  78         &xfs_params.restrict_chown.min, &xfs_params.restrict_chown.max},
  79
  80         {XFS_SGID_INHERIT, "irix_sgid_inherit", &xfs_params.sgid_inherit.val,
  81         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  82         &sysctl_intvec, NULL,
  83         &xfs_params.sgid_inherit.min, &xfs_params.sgid_inherit.max},
  84
  85         {XFS_SYMLINK_MODE, "irix_symlink_mode", &xfs_params.symlink_mode.val,
  86         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  87         &sysctl_intvec, NULL,
  88         &xfs_params.symlink_mode.min, &xfs_params.symlink_mode.max},
  89
  90         {XFS_PANIC_MASK, "panic_mask", &xfs_params.panic_mask.val,
  91         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  92         &sysctl_intvec, NULL,
  93         &xfs_params.panic_mask.min, &xfs_params.panic_mask.max},
  94
  95         {XFS_ERRLEVEL, "error_level", &xfs_params.error_level.val,
  96         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  97         &sysctl_intvec, NULL,
  98         &xfs_params.error_level.min, &xfs_params.error_level.max},
  99
 100         {XFS_SYNCD_TIMER, "xfssyncd_centisecs", &xfs_params.syncd_timer.val,
 101         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 102         &sysctl_intvec, NULL,
 103         &xfs_params.syncd_timer.min, &xfs_params.syncd_timer.max},
 104
 105         {XFS_INHERIT_SYNC, "inherit_sync", &xfs_params.inherit_sync.val,
 106         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 107         &sysctl_intvec, NULL,
 108         &xfs_params.inherit_sync.min, &xfs_params.inherit_sync.max},
 109
 110         {XFS_INHERIT_NODUMP, "inherit_nodump", &xfs_params.inherit_nodump.val,
 111         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 112         &sysctl_intvec, NULL,
 113         &xfs_params.inherit_nodump.min, &xfs_params.inherit_nodump.max},
 114
 115         {XFS_INHERIT_NOATIME, "inherit_noatime", &xfs_params.inherit_noatim.val,
 116         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 117         &sysctl_intvec, NULL,
 118         &xfs_params.inherit_noatim.min, &xfs_params.inherit_noatim.max},
 119
 120         {XFS_BUF_TIMER, "xfsbufd_centisecs", &xfs_params.xfs_buf_timer.val,
 121         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 122         &sysctl_intvec, NULL,
 123         &xfs_params.xfs_buf_timer.min, &xfs_params.xfs_buf_timer.max},
 124
 125         {XFS_BUF_AGE, "age_buffer_centisecs", &xfs_params.xfs_buf_age.val,
 126         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 127         &sysctl_intvec, NULL,
 128         &xfs_params.xfs_buf_age.min, &xfs_params.xfs_buf_age.max},
 129
 130         {XFS_INHERIT_NOSYM, "inherit_nosymlinks", &xfs_params.inherit_nosym.val,
 131         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 132         &sysctl_intvec, NULL,
 133         &xfs_params.inherit_nosym.min, &xfs_params.inherit_nosym.max},
 134
 135         {XFS_ROTORSTEP, "rotorstep", &xfs_params.rotorstep.val,
 136         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 137         &sysctl_intvec, NULL,
 138         &xfs_params.rotorstep.min, &xfs_params.rotorstep.max},
 139
 140         /* please keep this the last entry */
 141 #ifdef CONFIG_PROC_FS
 142         {XFS_STATS_CLEAR, "stats_clear", &xfs_params.stats_clear.val,
 143         sizeof(int), 0644, NULL, &xfs_stats_clear_proc_handler,
 144         &sysctl_intvec, NULL,
 145         &xfs_params.stats_clear.min, &xfs_params.stats_clear.max},
 146 #endif /* CONFIG_PROC_FS */
 147
 148         {0}
 149 };
 150
 151 STATIC ctl_table xfs_dir_table[] = {
 152         {FS_XFS, "xfs", NULL, 0, 0555, xfs_table},
 153         {0}
 154 };
 155
 156 STATIC ctl_table xfs_root_table[] = {
 157         {CTL_FS, "fs",  NULL, 0, 0555, xfs_dir_table},
 158         {0}
 159 };
 160
 161 void
 162 xfs_sysctl_register(void)
 163 {
 164         xfs_table_header = register_sysctl_table(xfs_root_table, 1);
 165 }
 166
 167 void
 168 xfs_sysctl_unregister(void)
 169 {
 170         if (xfs_table_header)
 171                 unregister_sysctl_table(xfs_table_header);
 172 }