release/src-rt-6.x/linux/linux-2.6/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 };
  46
  47 static match_table_t tokens = {
  48         {Opt_lockproto, "lockproto=%s"},
  49         {Opt_locktable, "locktable=%s"},
  50         {Opt_hostdata, "hostdata=%s"},
  51         {Opt_spectator, "spectator"},
  52         {Opt_ignore_local_fs, "ignore_local_fs"},
  53         {Opt_localflocks, "localflocks"},
  54         {Opt_localcaching, "localcaching"},
  55         {Opt_debug, "debug"},
  56         {Opt_nodebug, "nodebug"},
  57         {Opt_upgrade, "upgrade"},
  58         {Opt_num_glockd, "num_glockd=%d"},
  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 };
  69
  70 /**
  71  * gfs2_mount_args - Parse mount options
  72  * @sdp:
  73  * @data:
  74  *
  75  * Return: errno
  76  */
  77
  78 int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
  79 {
  80         struct gfs2_args *args = &sdp->sd_args;
  81         char *data = data_arg;
  82         char *options, *o, *v;
  83         int error = 0;
  84
  85         if (!remount) {
  86                 /*  If someone preloaded options, use those instead  */
  87                 spin_lock(&gfs2_sys_margs_lock);
  88                 if (gfs2_sys_margs) {
  89                         data = gfs2_sys_margs;
  90                         gfs2_sys_margs = NULL;
  91                 }
  92                 spin_unlock(&gfs2_sys_margs_lock);
  93
  94                 /*  Set some defaults  */
  95                 args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
  96                 args->ar_quota = GFS2_QUOTA_DEFAULT;
  97                 args->ar_data = GFS2_DATA_DEFAULT;
  98         }
  99
 100         /* Split the options into tokens with the "," character and
 101            process them */
 102
 103         for (options = data; (o = strsep(&options, ",")); ) {
 104                 int token, option;
 105                 substring_t tmp[MAX_OPT_ARGS];
 106
 107                 if (!*o)
 108                         continue;
 109
 110                 token = match_token(o, tokens, tmp);
 111                 switch (token) {
 112                 case Opt_lockproto:
 113                         v = match_strdup(&tmp[0]);
 114                         if (!v) {
 115                                 fs_info(sdp, "no memory for lockproto\n");
 116                                 error = -ENOMEM;
 117                                 goto out_error;
 118                         }
 119
 120                         if (remount && strcmp(v, args->ar_lockproto)) {
 121                                 kfree(v);
 122                                 goto cant_remount;
 123                         }
 124
 125                         strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
 126                         args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
 127                         kfree(v);
 128                         break;
 129                 case Opt_locktable:
 130                         v = match_strdup(&tmp[0]);
 131                         if (!v) {
 132                                 fs_info(sdp, "no memory for locktable\n");
 133                                 error = -ENOMEM;
 134                                 goto out_error;
 135                         }
 136
 137                         if (remount && strcmp(v, args->ar_locktable)) {
 138                                 kfree(v);
 139                                 goto cant_remount;
 140                         }
 141
 142                         strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
 143                         args->ar_locktable[GFS2_LOCKNAME_LEN - 1]  = 0;
 144                         kfree(v);
 145                         break;
 146                 case Opt_hostdata:
 147                         v = match_strdup(&tmp[0]);
 148                         if (!v) {
 149                                 fs_info(sdp, "no memory for hostdata\n");
 150                                 error = -ENOMEM;
 151                                 goto out_error;
 152                         }
 153
 154                         if (remount && strcmp(v, args->ar_hostdata)) {
 155                                 kfree(v);
 156                                 goto cant_remount;
 157                         }
 158
 159                         strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
 160                         args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
 161                         kfree(v);
 162                         break;
 163                 case Opt_spectator:
 164                         if (remount && !args->ar_spectator)
 165                                 goto cant_remount;
 166                         args->ar_spectator = 1;
 167                         sdp->sd_vfs->s_flags |= MS_RDONLY;
 168                         break;
 169                 case Opt_ignore_local_fs:
 170                         if (remount && !args->ar_ignore_local_fs)
 171                                 goto cant_remount;
 172                         args->ar_ignore_local_fs = 1;
 173                         break;
 174                 case Opt_localflocks:
 175                         if (remount && !args->ar_localflocks)
 176                                 goto cant_remount;
 177                         args->ar_localflocks = 1;
 178                         break;
 179                 case Opt_localcaching:
 180                         if (remount && !args->ar_localcaching)
 181                                 goto cant_remount;
 182                         args->ar_localcaching = 1;
 183                         break;
 184                 case Opt_debug:
 185                         args->ar_debug = 1;
 186                         break;
 187                 case Opt_nodebug:
 188                         args->ar_debug = 0;
 189                         break;
 190                 case Opt_upgrade:
 191                         if (remount && !args->ar_upgrade)
 192                                 goto cant_remount;
 193                         args->ar_upgrade = 1;
 194                         break;
 195                 case Opt_num_glockd:
 196                         if ((error = match_int(&tmp[0], &option))) {
 197                                 fs_info(sdp, "problem getting num_glockd\n");
 198                                 goto out_error;
 199                         }
 200
 201                         if (remount && option != args->ar_num_glockd)
 202                                 goto cant_remount;
 203                         if (!option || option > GFS2_GLOCKD_MAX) {
 204                                 fs_info(sdp, "0 < num_glockd <= %u  (not %u)\n",
 205                                         GFS2_GLOCKD_MAX, option);
 206                                 error = -EINVAL;
 207                                 goto out_error;
 208                         }
 209                         args->ar_num_glockd = option;
 210                         break;
 211                 case Opt_acl:
 212                         args->ar_posix_acl = 1;
 213                         sdp->sd_vfs->s_flags |= MS_POSIXACL;
 214                         break;
 215                 case Opt_noacl:
 216                         args->ar_posix_acl = 0;
 217                         sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
 218                         break;
 219                 case Opt_quota_off:
 220                         args->ar_quota = GFS2_QUOTA_OFF;
 221                         break;
 222                 case Opt_quota_account:
 223                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
 224                         break;
 225                 case Opt_quota_on:
 226                         args->ar_quota = GFS2_QUOTA_ON;
 227                         break;
 228                 case Opt_suiddir:
 229                         args->ar_suiddir = 1;
 230                         break;
 231                 case Opt_nosuiddir:
 232                         args->ar_suiddir = 0;
 233                         break;
 234                 case Opt_data_writeback:
 235                         args->ar_data = GFS2_DATA_WRITEBACK;
 236                         break;
 237                 case Opt_data_ordered:
 238                         args->ar_data = GFS2_DATA_ORDERED;
 239                         break;
 240                 default:
 241                         fs_info(sdp, "unknown option: %s\n", o);
 242                         error = -EINVAL;
 243                         goto out_error;
 244                 }
 245         }
 246
 247 out_error:
 248         if (error)
 249                 fs_info(sdp, "invalid mount option(s)\n");
 250
 251         if (data != data_arg)
 252                 kfree(data);
 253
 254         return error;
 255
 256 cant_remount:
 257         fs_info(sdp, "can't remount with option %s\n", o);
 258         return -EINVAL;
 259 }
 260