[deliverable/linux.git] / fs / gfs2 / mount.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>

#include "gfs2.h"
#include "incore.h"
#include "mount.h"
#include "sys.h"
#include "util.h"

/**
 * gfs2_mount_args - Parse mount options
 * @sdp:
 * @data:
 *
 * Return: errno
 */

int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
{
	struct gfs2_args *args = &sdp->sd_args;
	char *data = data_arg;
	char *options, *o, *v;
	int error = 0;

	if (!remount) {
		/*  If someone preloaded options, use those instead  */
		spin_lock(&gfs2_sys_margs_lock);
		if (gfs2_sys_margs) {
			data = gfs2_sys_margs;
			gfs2_sys_margs = NULL;
		}
		spin_unlock(&gfs2_sys_margs_lock);

		/*  Set some defaults  */
		args->ar_num_glockd = GFS2_GLOCKD_DEFAULT;
		args->ar_quota = GFS2_QUOTA_DEFAULT;
		args->ar_data = GFS2_DATA_DEFAULT;
	}

	/* Split the options into tokens with the "," character and
	   process them */

	for (options = data; (o = strsep(&options, ",")); ) {
		if (!*o)
			continue;

		v = strchr(o, '=');
		if (v)
			*v++ = 0;

		if (!strcmp(o, "lockproto")) {
			if (!v)
				goto need_value;
			if (remount && strcmp(v, args->ar_lockproto))
				goto cant_remount;
			strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
			args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
		}

		else if (!strcmp(o, "locktable")) {
			if (!v)
				goto need_value;
			if (remount && strcmp(v, args->ar_locktable))
				goto cant_remount;
			strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
			args->ar_locktable[GFS2_LOCKNAME_LEN - 1] = 0;
		}

		else if (!strcmp(o, "hostdata")) {
			if (!v)
				goto need_value;
			if (remount && strcmp(v, args->ar_hostdata))
				goto cant_remount;
			strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
			args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
		}

		else if (!strcmp(o, "spectator")) {
			if (remount && !args->ar_spectator)
				goto cant_remount;
			args->ar_spectator = 1;
			sdp->sd_vfs->s_flags |= MS_RDONLY;
		}

		else if (!strcmp(o, "ignore_local_fs")) {
			if (remount && !args->ar_ignore_local_fs)
				goto cant_remount;
			args->ar_ignore_local_fs = 1;
		}

		else if (!strcmp(o, "localflocks")) {
			if (remount && !args->ar_localflocks)
				goto cant_remount;
			args->ar_localflocks = 1;
		}

		else if (!strcmp(o, "localcaching")) {
			if (remount && !args->ar_localcaching)
				goto cant_remount;
			args->ar_localcaching = 1;
		}

		else if (!strcmp(o, "debug"))
			args->ar_debug = 1;

		else if (!strcmp(o, "nodebug"))
			args->ar_debug = 0;

		else if (!strcmp(o, "upgrade")) {
			if (remount && !args->ar_upgrade)
				goto cant_remount;
			args->ar_upgrade = 1;
		}

		else if (!strcmp(o, "num_glockd")) {
			unsigned int x;
			if (!v)
				goto need_value;
			sscanf(v, "%u", &x);
			if (remount && x != args->ar_num_glockd)
				goto cant_remount;
			if (!x || x > GFS2_GLOCKD_MAX) {
				fs_info(sdp, "0 < num_glockd <= %u  (not %u)\n",
				        GFS2_GLOCKD_MAX, x);
				error = -EINVAL;
				break;
			}
			args->ar_num_glockd = x;
		}

		else if (!strcmp(o, "acl")) {
			args->ar_posix_acl = 1;
			sdp->sd_vfs->s_flags |= MS_POSIXACL;
		}

		else if (!strcmp(o, "noacl")) {
			args->ar_posix_acl = 0;
			sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
		}

		else if (!strcmp(o, "quota")) {
			if (!v)
				goto need_value;
			if (!strcmp(v, "off"))
				args->ar_quota = GFS2_QUOTA_OFF;
			else if (!strcmp(v, "account"))
				args->ar_quota = GFS2_QUOTA_ACCOUNT;
			else if (!strcmp(v, "on"))
				args->ar_quota = GFS2_QUOTA_ON;
			else {
				fs_info(sdp, "invalid value for quota\n");
				error = -EINVAL;
				break;
			}
		}

		else if (!strcmp(o, "suiddir"))
			args->ar_suiddir = 1;

		else if (!strcmp(o, "nosuiddir"))
			args->ar_suiddir = 0;

		else if (!strcmp(o, "data")) {
			if (!v)
				goto need_value;
			if (!strcmp(v, "writeback"))
				args->ar_data = GFS2_DATA_WRITEBACK;
			else if (!strcmp(v, "ordered"))
				args->ar_data = GFS2_DATA_ORDERED;
			else {
				fs_info(sdp, "invalid value for data\n");
				error = -EINVAL;
				break;
			}
		}

		else {
			fs_info(sdp, "unknown option: %s\n", o);
			error = -EINVAL;
			break;
		}
	}

	if (error)
		fs_info(sdp, "invalid mount option(s)\n");

	if (data != data_arg)
		kfree(data);

	return error;

need_value:
	fs_info(sdp, "need value for option %s\n", o);
	return -EINVAL;

cant_remount:
	fs_info(sdp, "can't remount with option %s\n", o);
	return -EINVAL;
}
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	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
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/slab.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
5c676f6d	14	#include <linux/gfs2_ondisk.h>
7d308590	15	#include <linux/lm_interface.h>
b3b94faa DT	16
b3b94faa DT	17	#include "gfs2.h"
5c676f6d	18	#include "incore.h"
b3b94faa DT	19	#include "mount.h"
b3b94faa DT	20	#include "sys.h"
5c676f6d	21	#include "util.h"
b3b94faa DT	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
a91ea69f	205	need_value:
b3b94faa DT	206	fs_info(sdp, "need value for option %s\n", o);
	207	return -EINVAL;
	208
a91ea69f	209	cant_remount:
b3b94faa DT	210	fs_info(sdp, "can't remount with option %s\n", o);
	211	return -EINVAL;
	212	}
	213