summaryrefslogtreecommitdiffstats
path: root/sbin/geom/class/multipath/geom_multipath.c
blob: 1bb3f32239a294ca4e4e670b6a4cf73fb7204b67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*-
 * Copyright (c) 2006 Mathew Jacob <mjacob@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <libgeom.h>
#include <uuid.h>
#include <geom/multipath/g_multipath.h>

#include "core/geom.h"
#include "misc/subr.h"

uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_MULTIPATH_VERSION;

static void mp_main(struct gctl_req *, unsigned int);
static void mp_label(struct gctl_req *);
static void mp_clear(struct gctl_req *);

struct g_command class_commands[] = {
	{
		"label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, mp_main, G_NULL_OPTS,
		NULL, "[-v] name prov ..."
	},
	{
		"clear", G_FLAG_VERBOSE, mp_main, G_NULL_OPTS,
		NULL, "[-v] prov ..."
	},
	G_CMD_SENTINEL
};

static void
mp_main(struct gctl_req *req, unsigned int flags __unused)
{
	const char *name;

	name = gctl_get_ascii(req, "verb");
	if (name == NULL) {
		gctl_error(req, "No '%s' argument.", "verb");
		return;
	}
	if (strcmp(name, "label") == 0) {
		mp_label(req);
	} else if (strcmp(name, "clear") == 0) {
		mp_clear(req);
	} else {
		gctl_error(req, "Unknown command: %s.", name);
	}
}

static void
mp_label(struct gctl_req *req)
{
	struct g_multipath_metadata md;
	off_t disksiz = 0, msize;
	uint8_t *sector;
	char *ptr;
	uuid_t uuid;
	uint32_t secsize = 0, ssize, status;
	const char *name;
	int error, i, nargs;

	nargs = gctl_get_int(req, "nargs");
	if (nargs < 2) {
		gctl_error(req, "wrong number of arguments.");
		return;
	}

	/*
	 * First, check each provider to make sure it's the same size.
	 * This also gets us our size and sectorsize for the metadata.
	 */
	for (i = 1; i < nargs; i++) {
		name = gctl_get_ascii(req, "arg%d", i);
		msize = g_get_mediasize(name);
		ssize = g_get_sectorsize(name);
		if (msize == 0 || ssize == 0) {
			gctl_error(req, "cannot get information about %s: %s.",
			    name, strerror(errno));
			return;
		}
		if (i == 1) {
			secsize = ssize;
			disksiz	= msize;
		} else {
			if (secsize != ssize) {
				gctl_error(req, "%s sector size %u different.",
				    name, ssize);
				return;
			}
			if (disksiz != msize) {
				gctl_error(req, "%s media size %ju different.",
				    name, (intmax_t)msize);
				return;
			}
		}
		
	}

	/*
	 * Allocate a sector to write as metadata.
	 */
	sector = malloc(secsize);
	if (sector == NULL) {
		gctl_error(req, "unable to allocate metadata buffer");
		return;
	}
	memset(sector, 0, secsize);

	/*
	 * Generate metadata.
	 */
	strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic));
	md.md_version = G_MULTIPATH_VERSION;
	name = gctl_get_ascii(req, "arg0");
	strlcpy(md.md_name, name, sizeof(md.md_name));
	md.md_size = disksiz;
	md.md_sectorsize = secsize;
	uuid_create(&uuid, &status);
	if (status != uuid_s_ok) {
		gctl_error(req, "cannot create a UUID.");
		return;
	}
	uuid_to_string(&uuid, &ptr, &status);
	if (status != uuid_s_ok) {
		gctl_error(req, "cannot stringify a UUID.");
		return;
	}
	strlcpy(md.md_uuid, ptr, sizeof (md.md_uuid));
	free(ptr);

	/*
	 * Clear last sector first for each provider to spoil anything extant
	 */
	for (i = 1; i < nargs; i++) {
		name = gctl_get_ascii(req, "arg%d", i);
		error = g_metadata_clear(name, NULL);
		if (error != 0) {
			gctl_error(req, "cannot clear metadata on %s: %s.",
			    name, strerror(error));
			return;
		}
	}

	multipath_metadata_encode(&md, sector);

	/*
	 * Ok, store metadata.
	 */
	for (i = 1; i < nargs; i++) {
		name = gctl_get_ascii(req, "arg%d", i);
		error = g_metadata_store(name, sector, secsize);
		if (error != 0) {
			fprintf(stderr, "Can't store metadata on %s: %s.\n",
			    name, strerror(error));
			goto fail;
		}
	}
	return;

fail:
	/*
	 * Clear last sector first for each provider to spoil anything extant
	 */
	for (i = 1; i < nargs; i++) {
		name = gctl_get_ascii(req, "arg%d", i);
		error = g_metadata_clear(name, NULL);
		if (error != 0) {
			gctl_error(req, "cannot clear metadata on %s: %s.",
			    name, strerror(error));
			continue;
		}
	}
}

static void
mp_clear(struct gctl_req *req)
{
	const char *name;
	int error, i, nargs;

	nargs = gctl_get_int(req, "nargs");
	if (nargs < 1) {
		gctl_error(req, "Too few arguments.");
		return;
	}

        for (i = 0; i < nargs; i++) {
		name = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_clear(name, G_MULTIPATH_MAGIC);
		if (error != 0) {
			fprintf(stderr, "Can't clear metadata on %s: %s.\n",
			    name, strerror(error));
			gctl_error(req, "Not fully done.");
			continue;
                }
        }
}
OpenPOWER on IntegriCloud