fs/xfs/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 #include "xfs_error.h"
  22
  23 static struct ctl_table_header *xfs_table_header;
  24
  25 #ifdef CONFIG_PROC_FS
  26 STATIC int
  27 xfs_stats_clear_proc_handler(
  28         struct ctl_table        *ctl,
  29         int                     write,
  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, buffer, lenp, ppos);
  38
  39         if (!ret && write && *valp) {
  40                 xfs_notice(NULL, "Clearing xfsstats");
  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
  56 STATIC int
  57 xfs_panic_mask_proc_handler(
  58         struct ctl_table        *ctl,
  59         int                     write,
  60         void                    __user *buffer,
  61         size_t                  *lenp,
  62         loff_t                  *ppos)
  63 {
  64         int             ret, *valp = ctl->data;
  65
  66         ret = proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
  67         if (!ret && write) {
  68                 xfs_panic_mask = *valp;
  69 #ifdef DEBUG
  70                 xfs_panic_mask |= (XFS_PTAG_SHUTDOWN_CORRUPT | XFS_PTAG_LOGRES);
  71 #endif
  72         }
  73         return ret;
  74 }
  75 #endif /* CONFIG_PROC_FS */
  76
  77 static struct ctl_table xfs_table[] = {
  78         {
  79                 .procname       = "irix_sgid_inherit",
  80                 .data           = &xfs_params.sgid_inherit.val,
  81                 .maxlen         = sizeof(int),
  82                 .mode           = 0644,
  83                 .proc_handler   = proc_dointvec_minmax,
  84                 .extra1         = &xfs_params.sgid_inherit.min,
  85                 .extra2         = &xfs_params.sgid_inherit.max
  86         },
  87         {
  88                 .procname       = "irix_symlink_mode",
  89                 .data           = &xfs_params.symlink_mode.val,
  90                 .maxlen         = sizeof(int),
  91                 .mode           = 0644,
  92                 .proc_handler   = proc_dointvec_minmax,
  93                 .extra1         = &xfs_params.symlink_mode.min,
  94                 .extra2         = &xfs_params.symlink_mode.max
  95         },
  96         {
  97                 .procname       = "panic_mask",
  98                 .data           = &xfs_params.panic_mask.val,
  99                 .maxlen         = sizeof(int),
 100                 .mode           = 0644,
 101                 .proc_handler   = xfs_panic_mask_proc_handler,
 102                 .extra1         = &xfs_params.panic_mask.min,
 103                 .extra2         = &xfs_params.panic_mask.max
 104         },
 105
 106         {
 107                 .procname       = "error_level",
 108                 .data           = &xfs_params.error_level.val,
 109                 .maxlen         = sizeof(int),
 110                 .mode           = 0644,
 111                 .proc_handler   = proc_dointvec_minmax,
 112                 .extra1         = &xfs_params.error_level.min,
 113                 .extra2         = &xfs_params.error_level.max
 114         },
 115         {
 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                 .extra1         = &xfs_params.syncd_timer.min,
 122                 .extra2         = &xfs_params.syncd_timer.max
 123         },
 124         {
 125                 .procname       = "inherit_sync",
 126                 .data           = &xfs_params.inherit_sync.val,
 127                 .maxlen         = sizeof(int),
 128                 .mode           = 0644,
 129                 .proc_handler   = proc_dointvec_minmax,
 130                 .extra1         = &xfs_params.inherit_sync.min,
 131                 .extra2         = &xfs_params.inherit_sync.max
 132         },
 133         {
 134                 .procname       = "inherit_nodump",
 135                 .data           = &xfs_params.inherit_nodump.val,
 136                 .maxlen         = sizeof(int),
 137                 .mode           = 0644,
 138                 .proc_handler   = proc_dointvec_minmax,
 139                 .extra1         = &xfs_params.inherit_nodump.min,
 140                 .extra2         = &xfs_params.inherit_nodump.max
 141         },
 142         {
 143                 .procname       = "inherit_noatime",
 144                 .data           = &xfs_params.inherit_noatim.val,
 145                 .maxlen         = sizeof(int),
 146                 .mode           = 0644,
 147                 .proc_handler   = proc_dointvec_minmax,
 148                 .extra1         = &xfs_params.inherit_noatim.min,
 149                 .extra2         = &xfs_params.inherit_noatim.max
 150         },
 151         {
 152                 .procname       = "inherit_nosymlinks",
 153                 .data           = &xfs_params.inherit_nosym.val,
 154                 .maxlen         = sizeof(int),
 155                 .mode           = 0644,
 156                 .proc_handler   = proc_dointvec_minmax,
 157                 .extra1         = &xfs_params.inherit_nosym.min,
 158                 .extra2         = &xfs_params.inherit_nosym.max
 159         },
 160         {
 161                 .procname       = "rotorstep",
 162                 .data           = &xfs_params.rotorstep.val,
 163                 .maxlen         = sizeof(int),
 164                 .mode           = 0644,
 165                 .proc_handler   = proc_dointvec_minmax,
 166                 .extra1         = &xfs_params.rotorstep.min,
 167                 .extra2         = &xfs_params.rotorstep.max
 168         },
 169         {
 170                 .procname       = "inherit_nodefrag",
 171                 .data           = &xfs_params.inherit_nodfrg.val,
 172                 .maxlen         = sizeof(int),
 173                 .mode           = 0644,
 174                 .proc_handler   = proc_dointvec_minmax,
 175                 .extra1         = &xfs_params.inherit_nodfrg.min,
 176                 .extra2         = &xfs_params.inherit_nodfrg.max
 177         },
 178         {
 179                 .procname       = "filestream_centisecs",
 180                 .data           = &xfs_params.fstrm_timer.val,
 181                 .maxlen         = sizeof(int),
 182                 .mode           = 0644,
 183                 .proc_handler   = proc_dointvec_minmax,
 184                 .extra1         = &xfs_params.fstrm_timer.min,
 185                 .extra2         = &xfs_params.fstrm_timer.max,
 186         },
 187         {
 188                 .procname       = "speculative_prealloc_lifetime",
 189                 .data           = &xfs_params.eofb_timer.val,
 190                 .maxlen         = sizeof(int),
 191                 .mode           = 0644,
 192                 .proc_handler   = proc_dointvec_minmax,
 193                 .extra1         = &xfs_params.eofb_timer.min,
 194                 .extra2         = &xfs_params.eofb_timer.max,
 195         },
 196         /* please keep this the last entry */
 197 #ifdef CONFIG_PROC_FS
 198         {
 199                 .procname       = "stats_clear",
 200                 .data           = &xfs_params.stats_clear.val,
 201                 .maxlen         = sizeof(int),
 202                 .mode           = 0644,
 203                 .proc_handler   = xfs_stats_clear_proc_handler,
 204                 .extra1         = &xfs_params.stats_clear.min,
 205                 .extra2         = &xfs_params.stats_clear.max
 206         },
 207 #endif /* CONFIG_PROC_FS */
 208
 209         {}
 210 };
 211
 212 static struct ctl_table xfs_dir_table[] = {
 213         {
 214                 .procname       = "xfs",
 215                 .mode           = 0555,
 216                 .child          = xfs_table
 217         },
 218         {}
 219 };
 220
 221 static struct ctl_table xfs_root_table[] = {
 222         {
 223                 .procname       = "fs",
 224                 .mode           = 0555,
 225                 .child          = xfs_dir_table
 226         },
 227         {}
 228 };
 229
 230 int
 231 xfs_sysctl_register(void)
 232 {
 233         xfs_table_header = register_sysctl_table(xfs_root_table);
 234         if (!xfs_table_header)
 235                 return -ENOMEM;
 236         return 0;
 237 }
 238
 239 void
 240 xfs_sysctl_unregister(void)
 241 {
 242         unregister_sysctl_table(xfs_table_header);
 243 }