[PATCH] ocfs2: fix mount option parsing
[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