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/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/lm_interface.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "mount.h"
  21 #include "sys.h"
  22 #include "util.h"
  23
  24 /**
  25  * gfs2_mount_args - Parse mount options
  26  * @sdp:
  27  * @data:
  28  *
  29  * Return: errno
  30  */
  31
  32 int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
  33 {
  34         struct gfs2_args *args = &sdp->sd_args;
  35         char *data = data_arg;
  36         char *options, *o, *v;
  37         int error = 0;
  38
  39         if (!remount) {
  40                 /*  If someone preloaded options, use those instead  */
  41                 spin_lock(&gfs2_sys_margs_lock);
  42                 if (gfs2_sys_margs) {
  43                         data = gfs2_sys_margs;
  44                         gfs2_sys_margs = NULL;
  45                 }
  46                 spin_unlock(&gfs2_sys_margs_lock);
  47
  48                 /*  Set some defaults  */
  49                 args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
  50                 args->ar_quota = GFS2_QUOTA_DEFAULT;
  51                 args->ar_data = GFS2_DATA_DEFAULT;
  52         }
  53
  54         /* Split the options into tokens with the "," character and
  55            process them */
  56
  57         for (options = data; (o = strsep(&options, ",")); ) {
  58                 if (!*o)
  59                         continue;
  60
  61                 v = strchr(o, '=');
  62                 if (v)
  63                         *v++ = 0;
  64
  65                 if (!strcmp(o, "lockproto")) {
  66                         if (!v)
  67                                 goto need_value;
  68                         if (remount && strcmp(v, args->ar_lockproto))
  69                                 goto cant_remount;
  70                         strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
  71                         args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
  72                 }
  73
  74                 else if (!strcmp(o, "locktable")) {
  75                         if (!v)
  76                                 goto need_value;
  77                         if (remount && strcmp(v, args->ar_locktable))
  78                                 goto cant_remount;
  79                         strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
  80                         args->ar_locktable[GFS2_LOCKNAME_LEN - 1] = 0;
  81                 }
  82
  83                 else if (!strcmp(o, "hostdata")) {
  84                         if (!v)
  85                                 goto need_value;
  86                         if (remount && strcmp(v, args->ar_hostdata))
  87                                 goto cant_remount;
  88                         strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
  89                         args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
  90                 }
  91
  92                 else if (!strcmp(o, "spectator")) {
  93                         if (remount && !args->ar_spectator)
  94                                 goto cant_remount;
  95                         args->ar_spectator = 1;
  96                         sdp->sd_vfs->s_flags |= MS_RDONLY;
  97                 }
  98
  99                 else if (!strcmp(o, "ignore_local_fs")) {
 100                         if (remount && !args->ar_ignore_local_fs)
 101                                 goto cant_remount;
 102                         args->ar_ignore_local_fs = 1;
 103                 }
 104
 105                 else if (!strcmp(o, "localflocks")) {
 106                         if (remount && !args->ar_localflocks)
 107                                 goto cant_remount;
 108                         args->ar_localflocks = 1;
 109                 }
 110
 111                 else if (!strcmp(o, "localcaching")) {
 112                         if (remount && !args->ar_localcaching)
 113                                 goto cant_remount;
 114                         args->ar_localcaching = 1;
 115                 }
 116
 117                 else if (!strcmp(o, "debug"))
 118                         args->ar_debug = 1;
 119
 120                 else if (!strcmp(o, "nodebug"))
 121                         args->ar_debug = 0;
 122
 123                 else if (!strcmp(o, "upgrade")) {
 124                         if (remount && !args->ar_upgrade)
 125                                 goto cant_remount;
 126                         args->ar_upgrade = 1;
 127                 }
 128
 129                 else if (!strcmp(o, "num_glockd")) {
 130                         unsigned int x;
 131                         if (!v)
 132                                 goto need_value;
 133                         sscanf(v, "%u", &x);
 134                         if (remount && x != args->ar_num_glockd)
 135                                 goto cant_remount;
 136                         if (!x || x > GFS2_GLOCKD_MAX) {
 137                                 fs_info(sdp, "0 < num_glockd <= %u  (not %u)\n",
 138                                         GFS2_GLOCKD_MAX, x);
 139                                 error = -EINVAL;
 140                                 break;
 141                         }
 142                         args->ar_num_glockd = x;
 143                 }
 144
 145                 else if (!strcmp(o, "acl")) {
 146                         args->ar_posix_acl = 1;
 147                         sdp->sd_vfs->s_flags |= MS_POSIXACL;
 148                 }
 149
 150                 else if (!strcmp(o, "noacl")) {
 151                         args->ar_posix_acl = 0;
 152                         sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
 153                 }
 154
 155                 else if (!strcmp(o, "quota")) {
 156                         if (!v)
 157                                 goto need_value;
 158                         if (!strcmp(v, "off"))
 159                                 args->ar_quota = GFS2_QUOTA_OFF;
 160                         else if (!strcmp(v, "account"))
 161                                 args->ar_quota = GFS2_QUOTA_ACCOUNT;
 162                         else if (!strcmp(v, "on"))
 163                                 args->ar_quota = GFS2_QUOTA_ON;
 164                         else {
 165                                 fs_info(sdp, "invalid value for quota\n");
 166                                 error = -EINVAL;
 167                                 break;
 168                         }
 169                 }
 170
 171                 else if (!strcmp(o, "suiddir"))
 172                         args->ar_suiddir = 1;
 173
 174                 else if (!strcmp(o, "nosuiddir"))
 175                         args->ar_suiddir = 0;
 176
 177                 else if (!strcmp(o, "data")) {
 178                         if (!v)
 179                                 goto need_value;
 180                         if (!strcmp(v, "writeback"))
 181                                 args->ar_data = GFS2_DATA_WRITEBACK;
 182                         else if (!strcmp(v, "ordered"))
 183                                 args->ar_data = GFS2_DATA_ORDERED;
 184                         else {
 185                                 fs_info(sdp, "invalid value for data\n");
 186                                 error = -EINVAL;
 187                                 break;
 188                         }
 189                 }
 190
 191                 else {
 192                         fs_info(sdp, "unknown option: %s\n", o);
 193                         error = -EINVAL;
 194                         break;
 195                 }
 196         }
 197
 198         if (error)
 199                 fs_info(sdp, "invalid mount option(s)\n");
 200
 201         if (data != data_arg)
 202                 kfree(data);
 203
 204         return error;
 205
 206 need_value:
 207         fs_info(sdp, "need value for option %s\n", o);
 208         return -EINVAL;
 209
 210 cant_remount:
 211         fs_info(sdp, "can't remount with option %s\n", o);
 212         return -EINVAL;
 213 }
 214