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-rw-r--r--fs/gfs2/mount.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/fs/gfs2/mount.c b/fs/gfs2/mount.c
new file mode 100644
index 000000000000..0d4b230785af
--- /dev/null
+++ b/fs/gfs2/mount.c
@@ -0,0 +1,214 @@
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 v.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
17#include "gfs2.h"
18#include "lm_interface.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
32int 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
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