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