kernel/2.6.29.6-aldebaran-rt/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_acl,
  36         Opt_noacl,
  37         Opt_quota_off,
  38         Opt_quota_account,
  39         Opt_quota_on,
  40         Opt_suiddir,
  41         Opt_nosuiddir,
  42         Opt_data_writeback,
  43         Opt_data_ordered,
  44         Opt_meta,
  45         Opt_err,
  46 };
  47
  48 static const 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_acl, "acl"},
  60         {Opt_noacl, "noacl"},
  61         {Opt_quota_off, "quota=off"},
  62         {Opt_quota_account, "quota=account"},
  63         {Opt_quota_on, "quota=on"},
  64         {Opt_suiddir, "suiddir"},
  65         {Opt_nosuiddir, "nosuiddir"},
  66         {Opt_data_writeback, "data=writeback"},
  67         {Opt_data_ordered, "data=ordered"},
  68         {Opt_meta, "meta"},
  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                 /*  Set some defaults  */
  89                 args->ar_quota = GFS2_QUOTA_DEFAULT;
  90                 args->ar_data = GFS2_DATA_DEFAULT;
  91         }
  92
  93         /* Split the options into tokens with the "," character and
  94            process them */
  95
  96         for (options = data; (o = strsep(&options, ",")); ) {
  97                 int token;
  98                 substring_t tmp[MAX_OPT_ARGS];
  99
 100                 if (!*o)
 101                         continue;
 102
 103                 token = match_token(o, tokens, tmp);
 104                 switch (token) {
 105                 case Opt_lockproto:
 106                         v = match_strdup(&tmp[0]);
 107                         if (!v) {
 108                                 fs_info(sdp, "no memory for lockproto\n");
 109                                 error = -ENOMEM;
 110                                 goto out_error;
 111                         }
 112
 113                         if (remount && strcmp(v, args->ar_lockproto)) {
 114                                 kfree(v);
 115                                 goto cant_remount;
 116                         }
 117
 118                         strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
 119                         args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
 120                         kfree(v);
 121                         break;
 122                 case Opt_locktable:
 123                         v = match_strdup(&tmp[0]);
 124                         if (!v) {
 125                                 fs_info(sdp, "no memory for locktable\n");
 126                                 error = -ENOMEM;
 127                                 goto out_error;
 128                         }
 129
 130                         if (remount && strcmp(v, args->ar_locktable)) {
 131                                 kfree(v);
 132                                 goto cant_remount;
 133                         }
 134
 135                         strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
 136                         args->ar_locktable[GFS2_LOCKNAME_LEN - 1]  = 0;
 137                         kfree(v);
 138                         break;
 139                 case Opt_hostdata:
 140                         v = match_strdup(&tmp[0]);
 141                         if (!v) {
 142                                 fs_info(sdp, "no memory for hostdata\n");
 143                                 error = -ENOMEM;
 144                                 goto out_error;
 145                         }
 146
 147                         if (remount && strcmp(v, args->ar_hostdata)) {
 148                                 kfree(v);
 149                                 goto cant_remount;
 150                         }
 151
 152                         strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
 153                         args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
 154                         kfree(v);
 155                         break;
 156                 case Opt_spectator:
 157                         if (remount && !args->ar_spectator)
 158                                 goto cant_remount;
 159                         args->ar_spectator = 1;
 160                         sdp->sd_vfs->s_flags |= MS_RDONLY;
 161                         break;
 162                 case Opt_ignore_local_fs:
 163                         if (remount && !args->ar_ignore_local_fs)
 164                                 goto cant_remount;
 165                         args->ar_ignore_local_fs = 1;
 166                         break;
 167                 case Opt_localflocks:
 168                         if (remount && !args->ar_localflocks)
 169                                 goto cant_remount;
 170                         args->ar_localflocks = 1;
 171                         break;
 172                 case Opt_localcaching:
 173                         if (remount && !args->ar_localcaching)
 174                                 goto cant_remount;
 175                         args->ar_localcaching = 1;
 176                         break;
 177                 case Opt_debug:
 178                         args->ar_debug = 1;
 179                         break;
 180                 case Opt_nodebug:
 181                         args->ar_debug = 0;
 182                         break;
 183                 case Opt_upgrade:
 184                         if (remount && !args->ar_upgrade)
 185                                 goto cant_remount;
 186                         args->ar_upgrade = 1;
 187                         break;
 188                 case Opt_acl:
 189                         args->ar_posix_acl = 1;
 190                         sdp->sd_vfs->s_flags |= MS_POSIXACL;
 191                         break;
 192                 case Opt_noacl:
 193                         args->ar_posix_acl = 0;
 194                         sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
 195                         break;
 196                 case Opt_quota_off:
 197                         args->ar_quota = GFS2_QUOTA_OFF;
 198                         break;
 199                 case Opt_quota_account:
 200                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 201                         break;
 202                 case Opt_quota_on:
 203                         args->ar_quota = GFS2_QUOTA_ON;
 204                         break;
 205                 case Opt_suiddir:
 206                         args->ar_suiddir = 1;
 207                         break;
 208                 case Opt_nosuiddir:
 209                         args->ar_suiddir = 0;
 210                         break;
 211                 case Opt_data_writeback:
 212                         args->ar_data = GFS2_DATA_WRITEBACK;
 213                         break;
 214                 case Opt_data_ordered:
 215                         args->ar_data = GFS2_DATA_ORDERED;
 216                         break;
 217                 case Opt_meta:
 218                         if (remount && args->ar_meta != 1)
 219                                 goto cant_remount;
 220                         args->ar_meta = 1;
 221                         break;
 222                 case Opt_err:
 223                 default:
 224                         fs_info(sdp, "unknown option: %s\n", o);
 225                         error = -EINVAL;
 226                         goto out_error;
 227                 }
 228         }
 229
 230 out_error:
 231         if (error)
 232                 fs_info(sdp, "invalid mount option(s)\n");
 233
 234         if (data != data_arg)
 235                 kfree(data);
 236
 237         return error;
 238
 239 cant_remount:
 240         fs_info(sdp, "can't remount with option %s\n", o);
 241         return -EINVAL;
 242 }
 243