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_each_possible_cpu(c) {
  42                         preempt_disable();
  43                         /* save vn_active, it's a universal truth! */
  44                         vn_active = per_cpu(xfsstats, c).vn_active;
  45                         memset(&per_cpu(xfsstats, c), 0,
  46                                sizeof(struct xfsstats));
  47                         per_cpu(xfsstats, c).vn_active = vn_active;
  48                         preempt_enable();
  49                 }
  50                 xfs_stats_clear = 0;
  51         }
  52
  53         return ret;
  54 }
  55 #endif /* CONFIG_PROC_FS */
  56
  57 static ctl_table xfs_table[] = {
  58         {
  59                 .ctl_name       = XFS_RESTRICT_CHOWN,
  60                 .procname       = "restrict_chown",
  61                 .data           = &xfs_params.restrict_chown.val,
  62                 .maxlen         = sizeof(int),
  63                 .mode           = 0644,
  64                 .proc_handler   = &proc_dointvec_minmax,
  65                 .strategy       = &sysctl_intvec,
  66                 .extra1         = &xfs_params.restrict_chown.min,
  67                 .extra2         = &xfs_params.restrict_chown.max
  68         },
  69         {
  70                 .ctl_name       = XFS_SGID_INHERIT,
  71                 .procname       = "irix_sgid_inherit",
  72                 .data           = &xfs_params.sgid_inherit.val,
  73                 .maxlen         = sizeof(int),
  74                 .mode           = 0644,
  75                 .proc_handler   = &proc_dointvec_minmax,
  76                 .strategy       = &sysctl_intvec,
  77                 .extra1         = &xfs_params.sgid_inherit.min,
  78                 .extra2         = &xfs_params.sgid_inherit.max
  79         },
  80         {
  81                 .ctl_name       = XFS_SYMLINK_MODE,
  82                 .procname       = "irix_symlink_mode",
  83                 .data           = &xfs_params.symlink_mode.val,
  84                 .maxlen         = sizeof(int),
  85                 .mode           = 0644,
  86                 .proc_handler   = &proc_dointvec_minmax,
  87                 .strategy       = &sysctl_intvec,
  88                 .extra1         = &xfs_params.symlink_mode.min,
  89                 .extra2         = &xfs_params.symlink_mode.max
  90         },
  91         {
  92                 .ctl_name       = XFS_PANIC_MASK,
  93                 .procname       = "panic_mask",
  94                 .data           = &xfs_params.panic_mask.val,
  95                 .maxlen         = sizeof(int),
  96                 .mode           = 0644,
  97                 .proc_handler   = &proc_dointvec_minmax,
  98                 .strategy       = &sysctl_intvec,
  99                 .extra1         = &xfs_params.panic_mask.min,
 100                 .extra2         = &xfs_params.panic_mask.max
 101         },
 102
 103         {
 104                 .ctl_name       = XFS_ERRLEVEL,
 105                 .procname       = "error_level",
 106                 .data           = &xfs_params.error_level.val,
 107                 .maxlen         = sizeof(int),
 108                 .mode           = 0644,
 109                 .proc_handler   = &proc_dointvec_minmax,
 110                 .strategy       = &sysctl_intvec,
 111                 .extra1         = &xfs_params.error_level.min,
 112                 .extra2         = &xfs_params.error_level.max
 113         },
 114         {
 115                 .ctl_name       = XFS_SYNCD_TIMER,
 116                 .procname       = "xfssyncd_centisecs",
 117                 .data           = &xfs_params.syncd_timer.val,
 118                 .maxlen         = sizeof(int),
 119                 .mode           = 0644,
 120                 .proc_handler   = &proc_dointvec_minmax,
 121                 .strategy       = &sysctl_intvec,
 122                 .extra1         = &xfs_params.syncd_timer.min,
 123                 .extra2         = &xfs_params.syncd_timer.max
 124         },
 125         {
 126                 .ctl_name       = XFS_INHERIT_SYNC,
 127                 .procname       = "inherit_sync",
 128                 .data           = &xfs_params.inherit_sync.val,
 129                 .maxlen         = sizeof(int),
 130                 .mode           = 0644,
 131                 .proc_handler   = &proc_dointvec_minmax,
 132                 .strategy       = &sysctl_intvec,
 133                 .extra1         = &xfs_params.inherit_sync.min,
 134                 .extra2         = &xfs_params.inherit_sync.max
 135         },
 136         {
 137                 .ctl_name       = XFS_INHERIT_NODUMP,
 138                 .procname       = "inherit_nodump",
 139                 .data           = &xfs_params.inherit_nodump.val,
 140                 .maxlen         = sizeof(int),
 141                 .mode           = 0644,
 142                 .proc_handler   = &proc_dointvec_minmax,
 143                 .strategy       = &sysctl_intvec,
 144                 .extra1         = &xfs_params.inherit_nodump.min,
 145                 .extra2         = &xfs_params.inherit_nodump.max
 146         },
 147         {
 148                 .ctl_name       = XFS_INHERIT_NOATIME,
 149                 .procname       = "inherit_noatime",
 150                 .data           = &xfs_params.inherit_noatim.val,
 151                 .maxlen         = sizeof(int),
 152                 .mode           = 0644,
 153                 .proc_handler   = &proc_dointvec_minmax,
 154                 .strategy       = &sysctl_intvec,
 155                 .extra1         = &xfs_params.inherit_noatim.min,
 156                 .extra2         = &xfs_params.inherit_noatim.max
 157         },
 158         {
 159                 .ctl_name       = XFS_BUF_TIMER,
 160                 .procname       = "xfsbufd_centisecs",
 161                 .data           = &xfs_params.xfs_buf_timer.val,
 162                 .maxlen         = sizeof(int),
 163                 .mode           = 0644,
 164                 .proc_handler   = &proc_dointvec_minmax,
 165                 .strategy       = &sysctl_intvec,
 166                 .extra1         = &xfs_params.xfs_buf_timer.min,
 167                 .extra2         = &xfs_params.xfs_buf_timer.max
 168         },
 169         {
 170                 .ctl_name       = XFS_BUF_AGE,
 171                 .procname       = "age_buffer_centisecs",
 172                 .data           = &xfs_params.xfs_buf_age.val,
 173                 .maxlen         = sizeof(int),
 174                 .mode           = 0644,
 175                 .proc_handler   = &proc_dointvec_minmax,
 176                 .strategy       = &sysctl_intvec,
 177                 .extra1         = &xfs_params.xfs_buf_age.min,
 178                 .extra2         = &xfs_params.xfs_buf_age.max
 179         },
 180         {
 181                 .ctl_name       = XFS_INHERIT_NOSYM,
 182                 .procname       = "inherit_nosymlinks",
 183                 .data           = &xfs_params.inherit_nosym.val,
 184                 .maxlen         = sizeof(int),
 185                 .mode           = 0644,
 186                 .proc_handler   = &proc_dointvec_minmax,
 187                 .strategy       = &sysctl_intvec,
 188                 .extra1         = &xfs_params.inherit_nosym.min,
 189                 .extra2         = &xfs_params.inherit_nosym.max
 190         },
 191         {
 192                 .ctl_name       = XFS_ROTORSTEP,
 193                 .procname       = "rotorstep",
 194                 .data           = &xfs_params.rotorstep.val,
 195                 .maxlen         = sizeof(int),
 196                 .mode           = 0644,
 197                 .proc_handler   = &proc_dointvec_minmax,
 198                 .strategy       = &sysctl_intvec,
 199                 .extra1         = &xfs_params.rotorstep.min,
 200                 .extra2         = &xfs_params.rotorstep.max
 201         },
 202         {
 203                 .ctl_name       = XFS_INHERIT_NODFRG,
 204                 .procname       = "inherit_nodefrag",
 205                 .data           = &xfs_params.inherit_nodfrg.val,
 206                 .maxlen         = sizeof(int),
 207                 .mode           = 0644,
 208                 .proc_handler   = &proc_dointvec_minmax,
 209                 .strategy       = &sysctl_intvec,
 210                 .extra1         = &xfs_params.inherit_nodfrg.min,
 211                 .extra2         = &xfs_params.inherit_nodfrg.max
 212         },
 213         /* please keep this the last entry */
 214 #ifdef CONFIG_PROC_FS
 215         {
 216                 .ctl_name       = XFS_STATS_CLEAR,
 217                 .procname       = "stats_clear",
 218                 .data           = &xfs_params.stats_clear.val,
 219                 .maxlen         = sizeof(int),
 220                 .mode           = 0644,
 221                 .proc_handler   = &xfs_stats_clear_proc_handler,
 222                 .strategy       = &sysctl_intvec,
 223                 .extra1         = &xfs_params.stats_clear.min,
 224                 .extra2         = &xfs_params.stats_clear.max
 225         },
 226 #endif /* CONFIG_PROC_FS */
 227
 228         {}
 229 };
 230
 231 static ctl_table xfs_dir_table[] = {
 232         {
 233                 .ctl_name       = FS_XFS,
 234                 .procname       = "xfs",
 235                 .mode           = 0555,
 236                 .child          = xfs_table
 237         },
 238         {}
 239 };
 240
 241 static ctl_table xfs_root_table[] = {
 242         {
 243                 .ctl_name       = CTL_FS,
 244                 .procname       = "fs",
 245                 .mode           = 0555,
 246                 .child          = xfs_dir_table
 247         },
 248         {}
 249 };
 250
 251 void
 252 xfs_sysctl_register(void)
 253 {
 254         xfs_table_header = register_sysctl_table(xfs_root_table, 0);
 255 }
 256
 257 void
 258 xfs_sysctl_unregister(void)
 259 {
 260         if (xfs_table_header)
 261                 unregister_sysctl_table(xfs_table_header);
 262 }