g_concat.h revision 126314 
1/*-
2 * Copyright (c) 2003 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/geom/concat/g_concat.h 126314 2004-02-27 15:32:49Z pjd $
27 */
28
29#ifndef	_G_CONCAT_H_
30#define	_G_CONCAT_H_
31
32#include <sys/endian.h>
33
34#define	G_CONCAT_CLASS_NAME	"CONCAT"
35
36#define	G_CONCAT_MAGIC		"GEOM::CONCAT"
37#define	G_CONCAT_VERSION	0
38
39#ifdef _KERNEL
40#define	G_CONCAT_TYPE_MANUAL	0
41#define	G_CONCAT_TYPE_AUTOMATIC	1
42
43#define	G_CONCAT_DEBUG(lvl, ...)	do {				\
44	if (g_concat_debug >= (lvl)) {					\
45		printf("GEOM_CONCAT[%u]: ", lvl);			\
46		printf(__VA_ARGS__);					\
47		printf("\n");						\
48	}								\
49} while (0)
50#define	G_CONCAT_LOGREQ(bp, ...)	do {				\
51	if (g_concat_debug >= 2) {					\
52		printf("GEOM_CONCAT[2]: ");				\
53		printf(__VA_ARGS__);					\
54		g_print_bio(bp);					\
55		printf("\n");						\
56	}								\
57} while (0)
58
59extern struct sysctl_oid_list sysctl__kern_geom_children;
60
61struct g_concat_disk {
62	struct g_consumer	*d_consumer;
63	struct g_concat_softc	*d_softc;
64	off_t			 d_start;
65	off_t			 d_end;
66	off_t			 d_length;
67	boolean_t		 d_valid;
68	LIST_ENTRY(g_concat_path) d_next;
69};
70
71struct g_concat_softc {
72	u_int		sc_type;	/* provider type */
73	struct g_provider *sc_provider;
74	char		sc_name[16];	/* concat name */
75	uint32_t	sc_id;		/* concat unique ID */
76
77	struct g_concat_disk *sc_disks;
78	uint16_t	sc_ndisks;
79};
80#endif	/* _KERNEL */
81
82struct g_concat_metadata {
83	char		md_magic[16];	/* Magic value. */
84	uint32_t	md_version;	/* Version number. */
85	char		md_name[16];	/* Concat name. */
86	uint32_t	md_id;		/* Unique ID. */
87	uint16_t	md_no;		/* Disk number. */
88	uint16_t	md_all;		/* Number of all disks. */
89};
90static __inline void
91concat_metadata_encode(const struct g_concat_metadata *md, u_char *data)
92{
93
94	bcopy(md->md_magic, data, sizeof(md->md_magic));
95	le32enc(data + 16, md->md_version);
96	bcopy(md->md_name, data + 20, sizeof(md->md_name));
97	le32enc(data + 36, md->md_id);
98	le16enc(data + 40, md->md_no);
99	le16enc(data + 42, md->md_all);
100}
101static __inline void
102concat_metadata_decode(const u_char *data, struct g_concat_metadata *md)
103{
104
105	bcopy(data, md->md_magic, sizeof(md->md_magic));
106	md->md_version = le32dec(data + 16);
107	bcopy(data + 20, md->md_name, sizeof(md->md_name));
108	md->md_id = le32dec(data + 36);
109	md->md_no = le16dec(data + 40);
110	md->md_all = le16dec(data + 42);
111}
112#endif	/* _G_CONCAT_H_ */
113