117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
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/* $NetBSD: ebh_media.h,v 1.1 2011/11/24 15:51:32 ahoka Exp $ */
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/*-
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* Copyright (c) 2010 Department of Software Engineering,
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* University of Szeged, Hungary
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* Copyright (C) 2009 Ferenc Havasi <havasi@inf.u-szeged.hu>
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* Copyright (C) 2009 Zoltan Sogor <weth@inf.u-szeged.hu>
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* Copyright (C) 2009 David Tengeri <dtengeri@inf.u-szeged.hu>
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* Copyright (C) 2010 Adam Hoka <ahoka@NetBSD.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by the Department of Software Engineering, University of Szeged, Hungary
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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#ifndef EBH_MEDIA_H_
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#define EBH_MEDIA_H_
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#ifndef _LE_TYPES
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#define _LE_TYPES
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typedef uint16_t le16;
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typedef uint32_t le32;
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typedef uint64_t le64;
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#endif
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/*****************************************************************************/
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/* EBH specific structures */
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/*****************************************************************************/
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#define CHFS_MAGIC_BITMASK 0x53454452
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#define CHFS_LID_NOT_DIRTY_BIT 0x80000000
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#define CHFS_LID_DIRTY_BIT_MASK 0x7fffffff
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/* sizeof(crc) + sizeof(lid) */
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#define CHFS_INVALIDATE_SIZE 8
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/* Size of magic + crc_ec + erase_cnt */
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#define CHFS_EB_EC_HDR_SIZE sizeof(struct chfs_eb_ec_hdr)
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/* Size of NOR eraseblock header */
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#define CHFS_EB_HDR_NOR_SIZE sizeof(struct chfs_nor_eb_hdr)
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/* Size of NAND eraseblock header */
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#define CHFS_EB_HDR_NAND_SIZE sizeof(struct chfs_nand_eb_hdr)
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/*
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* chfs_eb_ec_hdr - erase counter header of eraseblock
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* @magic: filesystem magic
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* @crc_ec: CRC32 sum of erase counter
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* @erase_cnt: erase counter
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*
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* This structure holds the erasablock description information.
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* This will be written to the beginning of the eraseblock.
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*
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*/
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struct chfs_eb_ec_hdr {
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le32 magic;
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le32 crc_ec;
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le32 erase_cnt;
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} __packed;
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/**
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* struct chfs_nor_eb_hdr - eraseblock header on NOR flash
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* @crc: CRC32 sum
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* @lid: logical identifier
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*
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* @lid contains the logical block reference but only the first 31 bit (0-30) is
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* used. The 32th bit is for marking a lid dirty (marked for recovery purposes).
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* If a new eraseblock is succesfully assigned with the same lid then the lid of
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* the old one is zeroed. If power failure happened during this operation then
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* the recovery detects that there is two eraseblock with the same lid, but one
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* of them is marked (the old one).
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*
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* Invalidated eraseblock header means that the @crc and @lid is set to 0.
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*/
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struct chfs_nor_eb_hdr {
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le32 crc;
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le32 lid;
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} __packed;
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/**
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* struct chfs_nand_eb_hdr - eraseblock header on NAND flash
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* @crc: CRC32 sum
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* @lid: logical identifier
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* @serial: layout of the lid
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*
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* @serial is an unique number. Every eraseblock header on NAND flash has its
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* own serial. If there are two eraseblock on the flash referencing to the same
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* logical eraseblock, the one with bigger serial is the newer.
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*/
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struct chfs_nand_eb_hdr {
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le32 crc;
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le32 lid;
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le64 serial;
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} __packed;
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#endif /* EBH_MEDIA_H_ */
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