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