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         void            __user *buffer,
  30         size_t          *lenp,
  31         loff_t          *ppos)
  32 {
  33         int             c, ret, *valp = ctl->data;
  34         __uint32_t      vn_active;
  35
  36         ret = proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
  37
  38         if (!ret && write && *valp) {
  39                 printk("XFS Clearing xfsstats\n");
  40                 for_each_possible_cpu(c) {
  41                         preempt_disable();
  42                         /* save vn_active, it's a universal truth! */
  43                         vn_active = per_cpu(xfsstats, c).vn_active;
  44                         memset(&per_cpu(xfsstats, c), 0,
  45                                sizeof(struct xfsstats));
  46                         per_cpu(xfsstats, c).vn_active = vn_active;
  47                         preempt_enable();
  48                 }
  49                 xfs_stats_clear = 0;
  50         }
  51
  52         return ret;
  53 }
  54 #endif /* CONFIG_PROC_FS */
  55
  56 static ctl_table xfs_table[] = {
  57         {
  58                 .procname       = "irix_sgid_inherit",
  59                 .data           = &xfs_params.sgid_inherit.val,
  60                 .maxlen         = sizeof(int),
  61                 .mode           = 0644,
  62                 .proc_handler   = proc_dointvec_minmax,
  63                 .extra1         = &xfs_params.sgid_inherit.min,
  64                 .extra2         = &xfs_params.sgid_inherit.max
  65         },
  66         {
  67                 .procname       = "irix_symlink_mode",
  68                 .data           = &xfs_params.symlink_mode.val,
  69                 .maxlen         = sizeof(int),
  70                 .mode           = 0644,
  71                 .proc_handler   = proc_dointvec_minmax,
  72                 .extra1         = &xfs_params.symlink_mode.min,
  73                 .extra2         = &xfs_params.symlink_mode.max
  74         },
  75         {
  76                 .procname       = "panic_mask",
  77                 .data           = &xfs_params.panic_mask.val,
  78                 .maxlen         = sizeof(int),
  79                 .mode           = 0644,
  80                 .proc_handler   = proc_dointvec_minmax,
  81                 .extra1         = &xfs_params.panic_mask.min,
  82                 .extra2         = &xfs_params.panic_mask.max
  83         },
  84
  85         {
  86                 .procname       = "error_level",
  87                 .data           = &xfs_params.error_level.val,
  88                 .maxlen         = sizeof(int),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec_minmax,
  91                 .extra1         = &xfs_params.error_level.min,
  92                 .extra2         = &xfs_params.error_level.max
  93         },
  94         {
  95                 .procname       = "xfssyncd_centisecs",
  96                 .data           = &xfs_params.syncd_timer.val,
  97                 .maxlen         = sizeof(int),
  98                 .mode           = 0644,
  99                 .proc_handler   = proc_dointvec_minmax,
 100                 .extra1         = &xfs_params.syncd_timer.min,
 101                 .extra2         = &xfs_params.syncd_timer.max
 102         },
 103         {
 104                 .procname       = "inherit_sync",
 105                 .data           = &xfs_params.inherit_sync.val,
 106                 .maxlen         = sizeof(int),
 107                 .mode           = 0644,
 108                 .proc_handler   = proc_dointvec_minmax,
 109                 .extra1         = &xfs_params.inherit_sync.min,
 110                 .extra2         = &xfs_params.inherit_sync.max
 111         },
 112         {
 113                 .procname       = "inherit_nodump",
 114                 .data           = &xfs_params.inherit_nodump.val,
 115                 .maxlen         = sizeof(int),
 116                 .mode           = 0644,
 117                 .proc_handler   = proc_dointvec_minmax,
 118                 .extra1         = &xfs_params.inherit_nodump.min,
 119                 .extra2         = &xfs_params.inherit_nodump.max
 120         },
 121         {
 122                 .procname       = "inherit_noatime",
 123                 .data           = &xfs_params.inherit_noatim.val,
 124                 .maxlen         = sizeof(int),
 125                 .mode           = 0644,
 126                 .proc_handler   = proc_dointvec_minmax,
 127                 .extra1         = &xfs_params.inherit_noatim.min,
 128                 .extra2         = &xfs_params.inherit_noatim.max
 129         },
 130         {
 131                 .procname       = "xfsbufd_centisecs",
 132                 .data           = &xfs_params.xfs_buf_timer.val,
 133                 .maxlen         = sizeof(int),
 134                 .mode           = 0644,
 135                 .proc_handler   = proc_dointvec_minmax,
 136                 .extra1         = &xfs_params.xfs_buf_timer.min,
 137                 .extra2         = &xfs_params.xfs_buf_timer.max
 138         },
 139         {
 140                 .procname       = "age_buffer_centisecs",
 141                 .data           = &xfs_params.xfs_buf_age.val,
 142                 .maxlen         = sizeof(int),
 143                 .mode           = 0644,
 144                 .proc_handler   = proc_dointvec_minmax,
 145                 .extra1         = &xfs_params.xfs_buf_age.min,
 146                 .extra2         = &xfs_params.xfs_buf_age.max
 147         },
 148         {
 149                 .procname       = "inherit_nosymlinks",
 150                 .data           = &xfs_params.inherit_nosym.val,
 151                 .maxlen         = sizeof(int),
 152                 .mode           = 0644,
 153                 .proc_handler   = proc_dointvec_minmax,
 154                 .extra1         = &xfs_params.inherit_nosym.min,
 155                 .extra2         = &xfs_params.inherit_nosym.max
 156         },
 157         {
 158                 .procname       = "rotorstep",
 159                 .data           = &xfs_params.rotorstep.val,
 160                 .maxlen         = sizeof(int),
 161                 .mode           = 0644,
 162                 .proc_handler   = proc_dointvec_minmax,
 163                 .extra1         = &xfs_params.rotorstep.min,
 164                 .extra2         = &xfs_params.rotorstep.max
 165         },
 166         {
 167                 .procname       = "inherit_nodefrag",
 168                 .data           = &xfs_params.inherit_nodfrg.val,
 169                 .maxlen         = sizeof(int),
 170                 .mode           = 0644,
 171                 .proc_handler   = proc_dointvec_minmax,
 172                 .extra1         = &xfs_params.inherit_nodfrg.min,
 173                 .extra2         = &xfs_params.inherit_nodfrg.max
 174         },
 175         {
 176                 .procname       = "filestream_centisecs",
 177                 .data           = &xfs_params.fstrm_timer.val,
 178                 .maxlen         = sizeof(int),
 179                 .mode           = 0644,
 180                 .proc_handler   = proc_dointvec_minmax,
 181                 .extra1         = &xfs_params.fstrm_timer.min,
 182                 .extra2         = &xfs_params.fstrm_timer.max,
 183         },
 184         /* please keep this the last entry */
 185 #ifdef CONFIG_PROC_FS
 186         {
 187                 .procname       = "stats_clear",
 188                 .data           = &xfs_params.stats_clear.val,
 189                 .maxlen         = sizeof(int),
 190                 .mode           = 0644,
 191                 .proc_handler   = xfs_stats_clear_proc_handler,
 192                 .extra1         = &xfs_params.stats_clear.min,
 193                 .extra2         = &xfs_params.stats_clear.max
 194         },
 195 #endif /* CONFIG_PROC_FS */
 196
 197         {}
 198 };
 199
 200 static ctl_table xfs_dir_table[] = {
 201         {
 202                 .procname       = "xfs",
 203                 .mode           = 0555,
 204                 .child          = xfs_table
 205         },
 206         {}
 207 };
 208
 209 static ctl_table xfs_root_table[] = {
 210         {
 211                 .procname       = "fs",
 212                 .mode           = 0555,
 213                 .child          = xfs_dir_table
 214         },
 215         {}
 216 };
 217
 218 int
 219 xfs_sysctl_register(void)
 220 {
 221         xfs_table_header = register_sysctl_table(xfs_root_table);
 222         if (!xfs_table_header)
 223                 return -ENOMEM;
 224         return 0;
 225 }
 226
 227 void
 228 xfs_sysctl_unregister(void)
 229 {
 230         unregister_sysctl_table(xfs_table_header);
 231 }