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https://git.FreeBSD.org/src.git
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6c74f5177c
It allows to fix problems when last provider's sector is shared between few providers. - Bump version number for CONCAT and STRIPE and add code for backward compatibility. - Do not bump version number of MIRROR, as it wasn't officially introduced yet. Even if someone started to play with it, there is no big deal, because wrong MD5 sum of metadata will deny those providers. - Update manual pages. - Add version history to g_(stripe|concat).h files.
126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
/*-
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* Copyright (c) 2003 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _G_STRIPE_H_
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#define _G_STRIPE_H_
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#include <sys/endian.h>
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#define G_STRIPE_CLASS_NAME "STRIPE"
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#define G_STRIPE_MAGIC "GEOM::STRIPE"
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/*
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* Version history:
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* 0 - Initial version number.
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* 1 - Added 'stop' command for gstripe(8).
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* 2 - Added md_provider field to metadata and '-h' option for gstripe(8).
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*/
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#define G_STRIPE_VERSION 2
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#ifdef _KERNEL
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#define G_STRIPE_TYPE_MANUAL 0
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#define G_STRIPE_TYPE_AUTOMATIC 1
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#define G_STRIPE_DEBUG(lvl, ...) do { \
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if (g_stripe_debug >= (lvl)) { \
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printf("GEOM_STRIPE"); \
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if (g_stripe_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_STRIPE_LOGREQ(bp, ...) do { \
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if (g_stripe_debug >= 2) { \
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printf("GEOM_STRIPE[2]: "); \
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printf(__VA_ARGS__); \
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printf(" "); \
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g_print_bio(bp); \
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printf("\n"); \
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} \
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} while (0)
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struct g_stripe_softc {
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u_int sc_type; /* provider type */
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struct g_geom *sc_geom;
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struct g_provider *sc_provider;
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uint32_t sc_id; /* stripe unique ID */
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struct g_consumer **sc_disks;
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uint16_t sc_ndisks;
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uint32_t sc_stripesize;
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uint32_t sc_stripebits;
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};
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#define sc_name sc_geom->name
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#endif /* _KERNEL */
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struct g_stripe_metadata {
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char md_magic[16]; /* Magic value. */
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uint32_t md_version; /* Version number. */
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char md_name[16]; /* Stripe name. */
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uint32_t md_id; /* Unique ID. */
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uint16_t md_no; /* Disk number. */
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uint16_t md_all; /* Number of all disks. */
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uint32_t md_stripesize; /* Stripe size. */
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char md_provider[16]; /* Hardcoded provider. */
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};
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static __inline void
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stripe_metadata_encode(const struct g_stripe_metadata *md, u_char *data)
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{
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bcopy(md->md_magic, data, sizeof(md->md_magic));
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le32enc(data + 16, md->md_version);
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bcopy(md->md_name, data + 20, sizeof(md->md_name));
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le32enc(data + 36, md->md_id);
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le16enc(data + 40, md->md_no);
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le16enc(data + 42, md->md_all);
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le32enc(data + 44, md->md_stripesize);
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bcopy(md->md_provider, data + 48, sizeof(md->md_provider));
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}
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static __inline void
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stripe_metadata_decode(const u_char *data, struct g_stripe_metadata *md)
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{
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bcopy(data, md->md_magic, sizeof(md->md_magic));
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md->md_version = le32dec(data + 16);
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bcopy(data + 20, md->md_name, sizeof(md->md_name));
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md->md_id = le32dec(data + 36);
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md->md_no = le16dec(data + 40);
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md->md_all = le16dec(data + 42);
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md->md_stripesize = le32dec(data + 44);
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bcopy(data + 48, md->md_provider, sizeof(md->md_provider));
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}
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#ifndef BITCOUNT
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#define BITCOUNT(x) (((BX_(x) + (BX_(x) >> 4)) & 0x0F0F0F0F) % 255)
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#define BX_(x) ((x) - (((x) >> 1) & 0x77777777) - \
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(((x) >> 2) & 0x33333333) - (((x) >> 3) & 0x11111111))
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#endif
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#endif /* _G_STRIPE_H_ */
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