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
  33 #include "xfs.h"
  34 #include "xfs_rw.h"
  35 #include <linux/sysctl.h>
  36 #include <linux/proc_fs.h>
  37
  38
  39 static struct ctl_table_header *xfs_table_header;
  40
  41
  42 #ifdef CONFIG_PROC_FS
  43 STATIC int
  44 xfs_stats_clear_proc_handler(
  45         ctl_table       *ctl,
  46         int             write,
  47         struct file     *filp,
  48         void            __user *buffer,
  49         size_t          *lenp,
  50         loff_t          *ppos)
  51 {
  52         int             c, ret, *valp = ctl->data;
  53         __uint32_t      vn_active;
  54
  55         ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);
  56
  57         if (!ret && write && *valp) {
  58                 printk("XFS Clearing xfsstats\n");
  59                 for (c = 0; c < NR_CPUS; c++) {
  60                         if (!cpu_possible(c)) continue;
  61                         preempt_disable();
  62                         /* save vn_active, it's a universal truth! */
  63                         vn_active = per_cpu(xfsstats, c).vn_active;
  64                         memset(&per_cpu(xfsstats, c), 0,
  65                                sizeof(struct xfsstats));
  66                         per_cpu(xfsstats, c).vn_active = vn_active;
  67                         preempt_enable();
  68                 }
  69                 xfs_stats_clear = 0;
  70         }
  71
  72         return ret;
  73 }
  74 #endif /* CONFIG_PROC_FS */
  75
  76 STATIC ctl_table xfs_table[] = {
  77         {XFS_RESTRICT_CHOWN, "restrict_chown", &xfs_params.restrict_chown.val,
  78         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  79         &sysctl_intvec, NULL,
  80         &xfs_params.restrict_chown.min, &xfs_params.restrict_chown.max},
  81
  82         {XFS_SGID_INHERIT, "irix_sgid_inherit", &xfs_params.sgid_inherit.val,
  83         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  84         &sysctl_intvec, NULL,
  85         &xfs_params.sgid_inherit.min, &xfs_params.sgid_inherit.max},
  86
  87         {XFS_SYMLINK_MODE, "irix_symlink_mode", &xfs_params.symlink_mode.val,
  88         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  89         &sysctl_intvec, NULL,
  90         &xfs_params.symlink_mode.min, &xfs_params.symlink_mode.max},
  91
  92         {XFS_PANIC_MASK, "panic_mask", &xfs_params.panic_mask.val,
  93         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  94         &sysctl_intvec, NULL,
  95         &xfs_params.panic_mask.min, &xfs_params.panic_mask.max},
  96
  97         {XFS_ERRLEVEL, "error_level", &xfs_params.error_level.val,
  98         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
  99         &sysctl_intvec, NULL,
 100         &xfs_params.error_level.min, &xfs_params.error_level.max},
 101
 102         {XFS_SYNCD_TIMER, "xfssyncd_centisecs", &xfs_params.syncd_timer.val,
 103         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 104         &sysctl_intvec, NULL,
 105         &xfs_params.syncd_timer.min, &xfs_params.syncd_timer.max},
 106
 107         {XFS_INHERIT_SYNC, "inherit_sync", &xfs_params.inherit_sync.val,
 108         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 109         &sysctl_intvec, NULL,
 110         &xfs_params.inherit_sync.min, &xfs_params.inherit_sync.max},
 111
 112         {XFS_INHERIT_NODUMP, "inherit_nodump", &xfs_params.inherit_nodump.val,
 113         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 114         &sysctl_intvec, NULL,
 115         &xfs_params.inherit_nodump.min, &xfs_params.inherit_nodump.max},
 116
 117         {XFS_INHERIT_NOATIME, "inherit_noatime", &xfs_params.inherit_noatim.val,
 118         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 119         &sysctl_intvec, NULL,
 120         &xfs_params.inherit_noatim.min, &xfs_params.inherit_noatim.max},
 121
 122         {XFS_BUF_TIMER, "xfsbufd_centisecs", &xfs_params.xfs_buf_timer.val,
 123         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 124         &sysctl_intvec, NULL,
 125         &xfs_params.xfs_buf_timer.min, &xfs_params.xfs_buf_timer.max},
 126
 127         {XFS_BUF_AGE, "age_buffer_centisecs", &xfs_params.xfs_buf_age.val,
 128         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 129         &sysctl_intvec, NULL,
 130         &xfs_params.xfs_buf_age.min, &xfs_params.xfs_buf_age.max},
 131
 132         {XFS_INHERIT_NOSYM, "inherit_nosymlinks", &xfs_params.inherit_nosym.val,
 133         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 134         &sysctl_intvec, NULL,
 135         &xfs_params.inherit_nosym.min, &xfs_params.inherit_nosym.max},
 136
 137         {XFS_ROTORSTEP, "rotorstep", &xfs_params.rotorstep.val,
 138         sizeof(int), 0644, NULL, &proc_dointvec_minmax,
 139         &sysctl_intvec, NULL,
 140         &xfs_params.rotorstep.min, &xfs_params.rotorstep.max},
 141
 142         /* please keep this the last entry */
 143 #ifdef CONFIG_PROC_FS
 144         {XFS_STATS_CLEAR, "stats_clear", &xfs_params.stats_clear.val,
 145         sizeof(int), 0644, NULL, &xfs_stats_clear_proc_handler,
 146         &sysctl_intvec, NULL,
 147         &xfs_params.stats_clear.min, &xfs_params.stats_clear.max},
 148 #endif /* CONFIG_PROC_FS */
 149
 150         {0}
 151 };
 152
 153 STATIC ctl_table xfs_dir_table[] = {
 154         {FS_XFS, "xfs", NULL, 0, 0555, xfs_table},
 155         {0}
 156 };
 157
 158 STATIC ctl_table xfs_root_table[] = {
 159         {CTL_FS, "fs",  NULL, 0, 0555, xfs_dir_table},
 160         {0}
 161 };
 162
 163 void
 164 xfs_sysctl_register(void)
 165 {
 166         xfs_table_header = register_sysctl_table(xfs_root_table, 1);
 167 }
 168
 169 void
 170 xfs_sysctl_unregister(void)
 171 {
 172         if (xfs_table_header)
 173                 unregister_sysctl_table(xfs_table_header);
 174 }