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