g_stripe.h revision 132664 
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/stripe/g_stripe.h 132664 2004-07-26 16:10:27Z pjd $
27 */
28
29#ifndef	_G_STRIPE_H_
30#define	_G_STRIPE_H_
31
32#include <sys/endian.h>
33
34#define	G_STRIPE_CLASS_NAME	"STRIPE"
35
36#define	G_STRIPE_MAGIC		"GEOM::STRIPE"
37#define	G_STRIPE_VERSION	1
38
39#ifdef _KERNEL
40#define	G_STRIPE_TYPE_MANUAL	0
41#define	G_STRIPE_TYPE_AUTOMATIC	1
42
43#define	G_STRIPE_DEBUG(lvl, ...)	do {				\
44	if (g_stripe_debug >= (lvl)) {					\
45		printf("GEOM_STRIPE");					\
46		if (g_stripe_debug > 0)					\
47			printf("[%u]", lvl);				\
48		printf(": ");						\
49		printf(__VA_ARGS__);					\
50		printf("\n");						\
51	}								\
52} while (0)
53#define	G_STRIPE_LOGREQ(bp, ...)	do {				\
54	if (g_stripe_debug >= 2) {					\
55		printf("GEOM_STRIPE[2]: ");				\
56		printf(__VA_ARGS__);					\
57		printf(" ");						\
58		g_print_bio(bp);					\
59		printf("\n");						\
60	}								\
61} while (0)
62
63struct g_stripe_softc {
64	u_int		 sc_type;	/* provider type */
65	struct g_geom	*sc_geom;
66	struct g_provider *sc_provider;
67	uint32_t	 sc_id;		/* stripe unique ID */
68	struct g_consumer **sc_disks;
69	uint16_t	 sc_ndisks;
70	uint32_t	 sc_stripesize;
71	uint32_t	 sc_stripebits;
72};
73#define	sc_name	sc_geom->name
74#endif	/* _KERNEL */
75
76struct g_stripe_metadata {
77	char		md_magic[16];	/* Magic value. */
78	uint32_t	md_version;	/* Version number. */
79	char		md_name[16];	/* Stripe name. */
80	uint32_t	md_id;		/* Unique ID. */
81	uint16_t	md_no;		/* Disk number. */
82	uint16_t	md_all;		/* Number of all disks. */
83	uint32_t	md_stripesize;	/* Stripe size. */
84};
85static __inline void
86stripe_metadata_encode(const struct g_stripe_metadata *md, u_char *data)
87{
88
89	bcopy(md->md_magic, data, sizeof(md->md_magic));
90	le32enc(data + 16, md->md_version);
91	bcopy(md->md_name, data + 20, sizeof(md->md_name));
92	le32enc(data + 36, md->md_id);
93	le16enc(data + 40, md->md_no);
94	le16enc(data + 42, md->md_all);
95	le32enc(data + 44, md->md_stripesize);
96}
97static __inline void
98stripe_metadata_decode(const u_char *data, struct g_stripe_metadata *md)
99{
100
101	bcopy(data, md->md_magic, sizeof(md->md_magic));
102	md->md_version = le32dec(data + 16);
103	bcopy(data + 20, md->md_name, sizeof(md->md_name));
104	md->md_id = le32dec(data + 36);
105	md->md_no = le16dec(data + 40);
106	md->md_all = le16dec(data + 42);
107	md->md_stripesize = le32dec(data + 44);
108}
109
110#ifndef BITCOUNT
111#define	BITCOUNT(x)	(((BX_(x) + (BX_(x) >> 4)) & 0x0F0F0F0F) % 255)
112#define	BX_(x)		((x) - (((x) >> 1) & 0x77777777) -		\
113			 (((x) >> 2) & 0x33333333) - (((x) >> 3) & 0x11111111))
114#endif
115
116#endif	/* _G_STRIPE_H_ */
117