V4L/DVB (9657): em28xx: add a functio to write on a single register
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / mount.c
blobf96eb90a2cfa1a58d7a16215e8833e38a6e6fff3
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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 */
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>
18 #include "gfs2.h"
19 #include "incore.h"
20 #include "mount.h"
21 #include "sys.h"
22 #include "util.h"
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 Opt_meta,
46 Opt_err,
49 static const match_table_t tokens = {
50 {Opt_lockproto, "lockproto=%s"},
51 {Opt_locktable, "locktable=%s"},
52 {Opt_hostdata, "hostdata=%s"},
53 {Opt_spectator, "spectator"},
54 {Opt_ignore_local_fs, "ignore_local_fs"},
55 {Opt_localflocks, "localflocks"},
56 {Opt_localcaching, "localcaching"},
57 {Opt_debug, "debug"},
58 {Opt_nodebug, "nodebug"},
59 {Opt_upgrade, "upgrade"},
60 {Opt_num_glockd, "num_glockd=%d"},
61 {Opt_acl, "acl"},
62 {Opt_noacl, "noacl"},
63 {Opt_quota_off, "quota=off"},
64 {Opt_quota_account, "quota=account"},
65 {Opt_quota_on, "quota=on"},
66 {Opt_suiddir, "suiddir"},
67 {Opt_nosuiddir, "nosuiddir"},
68 {Opt_data_writeback, "data=writeback"},
69 {Opt_data_ordered, "data=ordered"},
70 {Opt_meta, "meta"},
71 {Opt_err, NULL}
74 /**
75 * gfs2_mount_args - Parse mount options
76 * @sdp:
77 * @data:
79 * Return: errno
82 int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
84 struct gfs2_args *args = &sdp->sd_args;
85 char *data = data_arg;
86 char *options, *o, *v;
87 int error = 0;
89 if (!remount) {
90 /* If someone preloaded options, use those instead */
91 spin_lock(&gfs2_sys_margs_lock);
92 if (gfs2_sys_margs) {
93 data = gfs2_sys_margs;
94 gfs2_sys_margs = NULL;
96 spin_unlock(&gfs2_sys_margs_lock);
98 /* Set some defaults */
99 args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
100 args->ar_quota = GFS2_QUOTA_DEFAULT;
101 args->ar_data = GFS2_DATA_DEFAULT;
104 /* Split the options into tokens with the "," character and
105 process them */
107 for (options = data; (o = strsep(&options, ",")); ) {
108 int token, option;
109 substring_t tmp[MAX_OPT_ARGS];
111 if (!*o)
112 continue;
114 token = match_token(o, tokens, tmp);
115 switch (token) {
116 case Opt_lockproto:
117 v = match_strdup(&tmp[0]);
118 if (!v) {
119 fs_info(sdp, "no memory for lockproto\n");
120 error = -ENOMEM;
121 goto out_error;
124 if (remount && strcmp(v, args->ar_lockproto)) {
125 kfree(v);
126 goto cant_remount;
129 strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
130 args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
131 kfree(v);
132 break;
133 case Opt_locktable:
134 v = match_strdup(&tmp[0]);
135 if (!v) {
136 fs_info(sdp, "no memory for locktable\n");
137 error = -ENOMEM;
138 goto out_error;
141 if (remount && strcmp(v, args->ar_locktable)) {
142 kfree(v);
143 goto cant_remount;
146 strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
147 args->ar_locktable[GFS2_LOCKNAME_LEN - 1] = 0;
148 kfree(v);
149 break;
150 case Opt_hostdata:
151 v = match_strdup(&tmp[0]);
152 if (!v) {
153 fs_info(sdp, "no memory for hostdata\n");
154 error = -ENOMEM;
155 goto out_error;
158 if (remount && strcmp(v, args->ar_hostdata)) {
159 kfree(v);
160 goto cant_remount;
163 strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
164 args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
165 kfree(v);
166 break;
167 case Opt_spectator:
168 if (remount && !args->ar_spectator)
169 goto cant_remount;
170 args->ar_spectator = 1;
171 sdp->sd_vfs->s_flags |= MS_RDONLY;
172 break;
173 case Opt_ignore_local_fs:
174 if (remount && !args->ar_ignore_local_fs)
175 goto cant_remount;
176 args->ar_ignore_local_fs = 1;
177 break;
178 case Opt_localflocks:
179 if (remount && !args->ar_localflocks)
180 goto cant_remount;
181 args->ar_localflocks = 1;
182 break;
183 case Opt_localcaching:
184 if (remount && !args->ar_localcaching)
185 goto cant_remount;
186 args->ar_localcaching = 1;
187 break;
188 case Opt_debug:
189 args->ar_debug = 1;
190 break;
191 case Opt_nodebug:
192 args->ar_debug = 0;
193 break;
194 case Opt_upgrade:
195 if (remount && !args->ar_upgrade)
196 goto cant_remount;
197 args->ar_upgrade = 1;
198 break;
199 case Opt_num_glockd:
200 if ((error = match_int(&tmp[0], &option))) {
201 fs_info(sdp, "problem getting num_glockd\n");
202 goto out_error;
205 if (remount && option != args->ar_num_glockd)
206 goto cant_remount;
207 if (!option || option > GFS2_GLOCKD_MAX) {
208 fs_info(sdp, "0 < num_glockd <= %u (not %u)\n",
209 GFS2_GLOCKD_MAX, option);
210 error = -EINVAL;
211 goto out_error;
213 args->ar_num_glockd = option;
214 break;
215 case Opt_acl:
216 args->ar_posix_acl = 1;
217 sdp->sd_vfs->s_flags |= MS_POSIXACL;
218 break;
219 case Opt_noacl:
220 args->ar_posix_acl = 0;
221 sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
222 break;
223 case Opt_quota_off:
224 args->ar_quota = GFS2_QUOTA_OFF;
225 break;
226 case Opt_quota_account:
227 args->ar_quota = GFS2_QUOTA_ACCOUNT;
228 break;
229 case Opt_quota_on:
230 args->ar_quota = GFS2_QUOTA_ON;
231 break;
232 case Opt_suiddir:
233 args->ar_suiddir = 1;
234 break;
235 case Opt_nosuiddir:
236 args->ar_suiddir = 0;
237 break;
238 case Opt_data_writeback:
239 args->ar_data = GFS2_DATA_WRITEBACK;
240 break;
241 case Opt_data_ordered:
242 args->ar_data = GFS2_DATA_ORDERED;
243 break;
244 case Opt_meta:
245 if (remount && args->ar_meta != 1)
246 goto cant_remount;
247 args->ar_meta = 1;
248 break;
249 case Opt_err:
250 default:
251 fs_info(sdp, "unknown option: %s\n", o);
252 error = -EINVAL;
253 goto out_error;
257 out_error:
258 if (error)
259 fs_info(sdp, "invalid mount option(s)\n");
261 if (data != data_arg)
262 kfree(data);
264 return error;
266 cant_remount:
267 fs_info(sdp, "can't remount with option %s\n", o);
268 return -EINVAL;