git.oblomov.eu Git - linux-2.6/blob - fs/gfs2/mount.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/gfs2_ondisk.h>
  15 #include <linux/lm_interface.h>
  16 #include <linux/parser.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "mount.h"
  21 #include "sys.h"
  22 #include "util.h"
  23
  24 enum {
  25         Opt_lockproto,
  26         Opt_locktable,
  27         Opt_hostdata,
  28         Opt_spectator,
  29         Opt_ignore_local_fs,
  30         Opt_localflocks,
  31         Opt_localcaching,
  32         Opt_debug,
  33         Opt_nodebug,
  34         Opt_upgrade,
  35         Opt_num_glockd,
  36         Opt_acl,
  37         Opt_noacl,
  38         Opt_quota_off,
  39         Opt_quota_account,
  40         Opt_quota_on,
  41         Opt_suiddir,
  42         Opt_nosuiddir,
  43         Opt_data_writeback,
  44         Opt_data_ordered,
  45         Opt_err,
  46 };
  47
  48 static match_table_t tokens = {
  49         {Opt_lockproto, "lockproto=%s"},
  50         {Opt_locktable, "locktable=%s"},
  51         {Opt_hostdata, "hostdata=%s"},
  52         {Opt_spectator, "spectator"},
  53         {Opt_ignore_local_fs, "ignore_local_fs"},
  54         {Opt_localflocks, "localflocks"},
  55         {Opt_localcaching, "localcaching"},
  56         {Opt_debug, "debug"},
  57         {Opt_nodebug, "nodebug"},
  58         {Opt_upgrade, "upgrade"},
  59         {Opt_num_glockd, "num_glockd=%d"},
  60         {Opt_acl, "acl"},
  61         {Opt_noacl, "noacl"},
  62         {Opt_quota_off, "quota=off"},
  63         {Opt_quota_account, "quota=account"},
  64         {Opt_quota_on, "quota=on"},
  65         {Opt_suiddir, "suiddir"},
  66         {Opt_nosuiddir, "nosuiddir"},
  67         {Opt_data_writeback, "data=writeback"},
  68         {Opt_data_ordered, "data=ordered"},
  69         {Opt_err, NULL}
  70 };
  71
  72 /**
  73  * gfs2_mount_args - Parse mount options
  74  * @sdp:
  75  * @data:
  76  *
  77  * Return: errno
  78  */
  79
  80 int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
  81 {
  82         struct gfs2_args *args = &sdp->sd_args;
  83         char *data = data_arg;
  84         char *options, *o, *v;
  85         int error = 0;
  86
  87         if (!remount) {
  88                 /*  If someone preloaded options, use those instead  */
  89                 spin_lock(&gfs2_sys_margs_lock);
  90                 if (gfs2_sys_margs) {
  91                         data = gfs2_sys_margs;
  92                         gfs2_sys_margs = NULL;
  93                 }
  94                 spin_unlock(&gfs2_sys_margs_lock);
  95
  96                 /*  Set some defaults  */
  97                 args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
  98                 args->ar_quota = GFS2_QUOTA_DEFAULT;
  99                 args->ar_data = GFS2_DATA_DEFAULT;
 100         }
 101
 102         /* Split the options into tokens with the "," character and
 103            process them */
 104
 105         for (options = data; (o = strsep(&options, ",")); ) {
 106                 int token, option;
 107                 substring_t tmp[MAX_OPT_ARGS];
 108
 109                 if (!*o)
 110                         continue;
 111
 112                 token = match_token(o, tokens, tmp);
 113                 switch (token) {
 114                 case Opt_lockproto:
 115                         v = match_strdup(&tmp[0]);
 116                         if (!v) {
 117                                 fs_info(sdp, "no memory for lockproto\n");
 118                                 error = -ENOMEM;
 119                                 goto out_error;
 120                         }
 121
 122                         if (remount && strcmp(v, args->ar_lockproto)) {
 123                                 kfree(v);
 124                                 goto cant_remount;
 125                         }
 126
 127                         strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
 128                         args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
 129                         kfree(v);
 130                         break;
 131                 case Opt_locktable:
 132                         v = match_strdup(&tmp[0]);
 133                         if (!v) {
 134                                 fs_info(sdp, "no memory for locktable\n");
 135                                 error = -ENOMEM;
 136                                 goto out_error;
 137                         }
 138
 139                         if (remount && strcmp(v, args->ar_locktable)) {
 140                                 kfree(v);
 141                                 goto cant_remount;
 142                         }
 143
 144                         strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
 145                         args->ar_locktable[GFS2_LOCKNAME_LEN - 1]  = 0;
 146                         kfree(v);
 147                         break;
 148                 case Opt_hostdata:
 149                         v = match_strdup(&tmp[0]);
 150                         if (!v) {
 151                                 fs_info(sdp, "no memory for hostdata\n");
 152                                 error = -ENOMEM;
 153                                 goto out_error;
 154                         }
 155
 156                         if (remount && strcmp(v, args->ar_hostdata)) {
 157                                 kfree(v);
 158                                 goto cant_remount;
 159                         }
 160
 161                         strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
 162                         args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
 163                         kfree(v);
 164                         break;
 165                 case Opt_spectator:
 166                         if (remount && !args->ar_spectator)
 167                                 goto cant_remount;
 168                         args->ar_spectator = 1;
 169                         sdp->sd_vfs->s_flags |= MS_RDONLY;
 170                         break;
 171                 case Opt_ignore_local_fs:
 172                         if (remount && !args->ar_ignore_local_fs)
 173                                 goto cant_remount;
 174                         args->ar_ignore_local_fs = 1;
 175                         break;
 176                 case Opt_localflocks:
 177                         if (remount && !args->ar_localflocks)
 178                                 goto cant_remount;
 179                         args->ar_localflocks = 1;
 180                         break;
 181                 case Opt_localcaching:
 182                         if (remount && !args->ar_localcaching)
 183                                 goto cant_remount;
 184                         args->ar_localcaching = 1;
 185                         break;
 186                 case Opt_debug:
 187                         args->ar_debug = 1;
 188                         break;
 189                 case Opt_nodebug:
 190                         args->ar_debug = 0;
 191                         break;
 192                 case Opt_upgrade:
 193                         if (remount && !args->ar_upgrade)
 194                                 goto cant_remount;
 195                         args->ar_upgrade = 1;
 196                         break;
 197                 case Opt_num_glockd:
 198                         if ((error = match_int(&tmp[0], &option))) {
 199                                 fs_info(sdp, "problem getting num_glockd\n");
 200                                 goto out_error;
 201                         }
 202
 203                         if (remount && option != args->ar_num_glockd)
 204                                 goto cant_remount;
 205                         if (!option || option > GFS2_GLOCKD_MAX) {
 206                                 fs_info(sdp, "0 < num_glockd <= %u  (not %u)\n",
 207                                         GFS2_GLOCKD_MAX, option);
 208                                 error = -EINVAL;
 209                                 goto out_error;
 210                         }
 211                         args->ar_num_glockd = option;
 212                         break;
 213                 case Opt_acl:
 214                         args->ar_posix_acl = 1;
 215                         sdp->sd_vfs->s_flags |= MS_POSIXACL;
 216                         break;
 217                 case Opt_noacl:
 218                         args->ar_posix_acl = 0;
 219                         sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
 220                         break;
 221                 case Opt_quota_off:
 222                         args->ar_quota = GFS2_QUOTA_OFF;
 223                         break;
 224                 case Opt_quota_account:
 225                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 226                         break;
 227                 case Opt_quota_on:
 228                         args->ar_quota = GFS2_QUOTA_ON;
 229                         break;
 230                 case Opt_suiddir:
 231                         args->ar_suiddir = 1;
 232                         break;
 233                 case Opt_nosuiddir:
 234                         args->ar_suiddir = 0;
 235                         break;
 236                 case Opt_data_writeback:
 237                         args->ar_data = GFS2_DATA_WRITEBACK;
 238                         break;
 239                 case Opt_data_ordered:
 240                         args->ar_data = GFS2_DATA_ORDERED;
 241                         break;
 242                 case Opt_err:
 243                 default:
 244                         fs_info(sdp, "unknown option: %s\n", o);
 245                         error = -EINVAL;
 246                         goto out_error;
 247                 }
 248         }
 249
 250 out_error:
 251         if (error)
 252                 fs_info(sdp, "invalid mount option(s)\n");
 253
 254         if (data != data_arg)
 255                 kfree(data);
 256
 257         return error;
 258
 259 cant_remount:
 260         fs_info(sdp, "can't remount with option %s\n", o);
 261         return -EINVAL;
 262 }
 263