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                 .ctl_name       = XFS_SGID_INHERIT,
  59                 .procname       = "irix_sgid_inherit",
  60                 .data           = &xfs_params.sgid_inherit.val,
  61                 .maxlen         = sizeof(int),
  62                 .mode           = 0644,
  63                 .proc_handler   = &proc_dointvec_minmax,
  64                 .strategy       = &sysctl_intvec,
  65                 .extra1         = &xfs_params.sgid_inherit.min,
  66                 .extra2         = &xfs_params.sgid_inherit.max
  67         },
  68         {
  69                 .ctl_name       = XFS_SYMLINK_MODE,
  70                 .procname       = "irix_symlink_mode",
  71                 .data           = &xfs_params.symlink_mode.val,
  72                 .maxlen         = sizeof(int),
  73                 .mode           = 0644,
  74                 .proc_handler   = &proc_dointvec_minmax,
  75                 .strategy       = &sysctl_intvec,
  76                 .extra1         = &xfs_params.symlink_mode.min,
  77                 .extra2         = &xfs_params.symlink_mode.max
  78         },
  79         {
  80                 .ctl_name       = XFS_PANIC_MASK,
  81                 .procname       = "panic_mask",
  82                 .data           = &xfs_params.panic_mask.val,
  83                 .maxlen         = sizeof(int),
  84                 .mode           = 0644,
  85                 .proc_handler   = &proc_dointvec_minmax,
  86                 .strategy       = &sysctl_intvec,
  87                 .extra1         = &xfs_params.panic_mask.min,
  88                 .extra2         = &xfs_params.panic_mask.max
  89         },
  90
  91         {
  92                 .ctl_name       = XFS_ERRLEVEL,
  93                 .procname       = "error_level",
  94                 .data           = &xfs_params.error_level.val,
  95                 .maxlen         = sizeof(int),
  96                 .mode           = 0644,
  97                 .proc_handler   = &proc_dointvec_minmax,
  98                 .strategy       = &sysctl_intvec,
  99                 .extra1         = &xfs_params.error_level.min,
 100                 .extra2         = &xfs_params.error_level.max
 101         },
 102         {
 103                 .ctl_name       = XFS_SYNCD_TIMER,
 104                 .procname       = "xfssyncd_centisecs",
 105                 .data           = &xfs_params.syncd_timer.val,
 106                 .maxlen         = sizeof(int),
 107                 .mode           = 0644,
 108                 .proc_handler   = &proc_dointvec_minmax,
 109                 .strategy       = &sysctl_intvec,
 110                 .extra1         = &xfs_params.syncd_timer.min,
 111                 .extra2         = &xfs_params.syncd_timer.max
 112         },
 113         {
 114                 .ctl_name       = XFS_INHERIT_SYNC,
 115                 .procname       = "inherit_sync",
 116                 .data           = &xfs_params.inherit_sync.val,
 117                 .maxlen         = sizeof(int),
 118                 .mode           = 0644,
 119                 .proc_handler   = &proc_dointvec_minmax,
 120                 .strategy       = &sysctl_intvec,
 121                 .extra1         = &xfs_params.inherit_sync.min,
 122                 .extra2         = &xfs_params.inherit_sync.max
 123         },
 124         {
 125                 .ctl_name       = XFS_INHERIT_NODUMP,
 126                 .procname       = "inherit_nodump",
 127                 .data           = &xfs_params.inherit_nodump.val,
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0644,
 130                 .proc_handler   = &proc_dointvec_minmax,
 131                 .strategy       = &sysctl_intvec,
 132                 .extra1         = &xfs_params.inherit_nodump.min,
 133                 .extra2         = &xfs_params.inherit_nodump.max
 134         },
 135         {
 136                 .ctl_name       = XFS_INHERIT_NOATIME,
 137                 .procname       = "inherit_noatime",
 138                 .data           = &xfs_params.inherit_noatim.val,
 139                 .maxlen         = sizeof(int),
 140                 .mode           = 0644,
 141                 .proc_handler   = &proc_dointvec_minmax,
 142                 .strategy       = &sysctl_intvec,
 143                 .extra1         = &xfs_params.inherit_noatim.min,
 144                 .extra2         = &xfs_params.inherit_noatim.max
 145         },
 146         {
 147                 .ctl_name       = XFS_BUF_TIMER,
 148                 .procname       = "xfsbufd_centisecs",
 149                 .data           = &xfs_params.xfs_buf_timer.val,
 150                 .maxlen         = sizeof(int),
 151                 .mode           = 0644,
 152                 .proc_handler   = &proc_dointvec_minmax,
 153                 .strategy       = &sysctl_intvec,
 154                 .extra1         = &xfs_params.xfs_buf_timer.min,
 155                 .extra2         = &xfs_params.xfs_buf_timer.max
 156         },
 157         {
 158                 .ctl_name       = XFS_BUF_AGE,
 159                 .procname       = "age_buffer_centisecs",
 160                 .data           = &xfs_params.xfs_buf_age.val,
 161                 .maxlen         = sizeof(int),
 162                 .mode           = 0644,
 163                 .proc_handler   = &proc_dointvec_minmax,
 164                 .strategy       = &sysctl_intvec,
 165                 .extra1         = &xfs_params.xfs_buf_age.min,
 166                 .extra2         = &xfs_params.xfs_buf_age.max
 167         },
 168         {
 169                 .ctl_name       = XFS_INHERIT_NOSYM,
 170                 .procname       = "inherit_nosymlinks",
 171                 .data           = &xfs_params.inherit_nosym.val,
 172                 .maxlen         = sizeof(int),
 173                 .mode           = 0644,
 174                 .proc_handler   = &proc_dointvec_minmax,
 175                 .strategy       = &sysctl_intvec,
 176                 .extra1         = &xfs_params.inherit_nosym.min,
 177                 .extra2         = &xfs_params.inherit_nosym.max
 178         },
 179         {
 180                 .ctl_name       = XFS_ROTORSTEP,
 181                 .procname       = "rotorstep",
 182                 .data           = &xfs_params.rotorstep.val,
 183                 .maxlen         = sizeof(int),
 184                 .mode           = 0644,
 185                 .proc_handler   = &proc_dointvec_minmax,
 186                 .strategy       = &sysctl_intvec,
 187                 .extra1         = &xfs_params.rotorstep.min,
 188                 .extra2         = &xfs_params.rotorstep.max
 189         },
 190         {
 191                 .ctl_name       = XFS_INHERIT_NODFRG,
 192                 .procname       = "inherit_nodefrag",
 193                 .data           = &xfs_params.inherit_nodfrg.val,
 194                 .maxlen         = sizeof(int),
 195                 .mode           = 0644,
 196                 .proc_handler   = &proc_dointvec_minmax,
 197                 .strategy       = &sysctl_intvec,
 198                 .extra1         = &xfs_params.inherit_nodfrg.min,
 199                 .extra2         = &xfs_params.inherit_nodfrg.max
 200         },
 201         {
 202                 .ctl_name       = XFS_FILESTREAM_TIMER,
 203                 .procname       = "filestream_centisecs",
 204                 .data           = &xfs_params.fstrm_timer.val,
 205                 .maxlen         = sizeof(int),
 206                 .mode           = 0644,
 207                 .proc_handler   = &proc_dointvec_minmax,
 208                 .strategy       = &sysctl_intvec,
 209                 .extra1         = &xfs_params.fstrm_timer.min,
 210                 .extra2         = &xfs_params.fstrm_timer.max,
 211         },
 212         /* please keep this the last entry */
 213 #ifdef CONFIG_PROC_FS
 214         {
 215                 .ctl_name       = XFS_STATS_CLEAR,
 216                 .procname       = "stats_clear",
 217                 .data           = &xfs_params.stats_clear.val,
 218                 .maxlen         = sizeof(int),
 219                 .mode           = 0644,
 220                 .proc_handler   = &xfs_stats_clear_proc_handler,
 221                 .strategy       = &sysctl_intvec,
 222                 .extra1         = &xfs_params.stats_clear.min,
 223                 .extra2         = &xfs_params.stats_clear.max
 224         },
 225 #endif /* CONFIG_PROC_FS */
 226
 227         {}
 228 };
 229
 230 static ctl_table xfs_dir_table[] = {
 231         {
 232                 .ctl_name       = FS_XFS,
 233                 .procname       = "xfs",
 234                 .mode           = 0555,
 235                 .child          = xfs_table
 236         },
 237         {}
 238 };
 239
 240 static ctl_table xfs_root_table[] = {
 241         {
 242                 .ctl_name       = CTL_FS,
 243                 .procname       = "fs",
 244                 .mode           = 0555,
 245                 .child          = xfs_dir_table
 246         },
 247         {}
 248 };
 249
 250 int
 251 xfs_sysctl_register(void)
 252 {
 253         xfs_table_header = register_sysctl_table(xfs_root_table);
 254         if (!xfs_table_header)
 255                 return -ENOMEM;
 256         return 0;
 257 }
 258
 259 void
 260 xfs_sysctl_unregister(void)
 261 {
 262         unregister_sysctl_table(xfs_table_header);
 263 }