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_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                 /*  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_quota = GFS2_QUOTA_DEFAULT;
  98                 args->ar_data = GFS2_DATA_DEFAULT;
  99         }
 100
 101         /* Split the options into tokens with the "," character and
 102            process them */
 103
 104         for (options = data; (o = strsep(&options, ",")); ) {
 105                 int token;
 106                 substring_t tmp[MAX_OPT_ARGS];
 107
 108                 if (!*o)
 109                         continue;
 110
 111                 token = match_token(o, tokens, tmp);
 112                 switch (token) {
 113                 case Opt_lockproto:
 114                         v = match_strdup(&tmp[0]);
 115                         if (!v) {
 116                                 fs_info(sdp, "no memory for lockproto\n");
 117                                 error = -ENOMEM;
 118                                 goto out_error;
 119                         }
 120
 121                         if (remount && strcmp(v, args->ar_lockproto)) {
 122                                 kfree(v);
 123                                 goto cant_remount;
 124                         }
 125
 126                         strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
 127                         args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
 128                         kfree(v);
 129                         break;
 130                 case Opt_locktable:
 131                         v = match_strdup(&tmp[0]);
 132                         if (!v) {
 133                                 fs_info(sdp, "no memory for locktable\n");
 134                                 error = -ENOMEM;
 135                                 goto out_error;
 136                         }
 137
 138                         if (remount && strcmp(v, args->ar_locktable)) {
 139                                 kfree(v);
 140                                 goto cant_remount;
 141                         }
 142
 143                         strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
 144                         args->ar_locktable[GFS2_LOCKNAME_LEN - 1]  = 0;
 145                         kfree(v);
 146                         break;
 147                 case Opt_hostdata:
 148                         v = match_strdup(&tmp[0]);
 149                         if (!v) {
 150                                 fs_info(sdp, "no memory for hostdata\n");
 151                                 error = -ENOMEM;
 152                                 goto out_error;
 153                         }
 154
 155                         if (remount && strcmp(v, args->ar_hostdata)) {
 156                                 kfree(v);
 157                                 goto cant_remount;
 158                         }
 159
 160                         strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
 161                         args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
 162                         kfree(v);
 163                         break;
 164                 case Opt_spectator:
 165                         if (remount && !args->ar_spectator)
 166                                 goto cant_remount;
 167                         args->ar_spectator = 1;
 168                         sdp->sd_vfs->s_flags |= MS_RDONLY;
 169                         break;
 170                 case Opt_ignore_local_fs:
 171                         if (remount && !args->ar_ignore_local_fs)
 172                                 goto cant_remount;
 173                         args->ar_ignore_local_fs = 1;
 174                         break;
 175                 case Opt_localflocks:
 176                         if (remount && !args->ar_localflocks)
 177                                 goto cant_remount;
 178                         args->ar_localflocks = 1;
 179                         break;
 180                 case Opt_localcaching:
 181                         if (remount && !args->ar_localcaching)
 182                                 goto cant_remount;
 183                         args->ar_localcaching = 1;
 184                         break;
 185                 case Opt_debug:
 186                         args->ar_debug = 1;
 187                         break;
 188                 case Opt_nodebug:
 189                         args->ar_debug = 0;
 190                         break;
 191                 case Opt_upgrade:
 192                         if (remount && !args->ar_upgrade)
 193                                 goto cant_remount;
 194                         args->ar_upgrade = 1;
 195                         break;
 196                 case Opt_acl:
 197                         args->ar_posix_acl = 1;
 198                         sdp->sd_vfs->s_flags |= MS_POSIXACL;
 199                         break;
 200                 case Opt_noacl:
 201                         args->ar_posix_acl = 0;
 202                         sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
 203                         break;
 204                 case Opt_quota_off:
 205                         args->ar_quota = GFS2_QUOTA_OFF;
 206                         break;
 207                 case Opt_quota_account:
 208                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 209                         break;
 210                 case Opt_quota_on:
 211                         args->ar_quota = GFS2_QUOTA_ON;
 212                         break;
 213                 case Opt_suiddir:
 214                         args->ar_suiddir = 1;
 215                         break;
 216                 case Opt_nosuiddir:
 217                         args->ar_suiddir = 0;
 218                         break;
 219                 case Opt_data_writeback:
 220                         args->ar_data = GFS2_DATA_WRITEBACK;
 221                         break;
 222                 case Opt_data_ordered:
 223                         args->ar_data = GFS2_DATA_ORDERED;
 224                         break;
 225                 case Opt_meta:
 226                         if (remount && args->ar_meta != 1)
 227                                 goto cant_remount;
 228                         args->ar_meta = 1;
 229                         break;
 230                 case Opt_err:
 231                 default:
 232                         fs_info(sdp, "unknown option: %s\n", o);
 233                         error = -EINVAL;
 234                         goto out_error;
 235                 }
 236         }
 237
 238 out_error:
 239         if (error)
 240                 fs_info(sdp, "invalid mount option(s)\n");
 241
 242         if (data != data_arg)
 243                 kfree(data);
 244
 245         return error;
 246
 247 cant_remount:
 248         fs_info(sdp, "can't remount with option %s\n", o);
 249         return -EINVAL;
 250 }
 251