/*
* Copyright (c) 2020 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* $Id: //eng/uds-releases/jasper/src/uds/layoutRegion.h#1 $
*/
#ifndef LAYOUT_REGION_H
#define LAYOUT_REGION_H
/**
* Single file layouts are defined in terms of data regions. Each data region
* is a sub-section of the available space. Some data regions may contain
* subsidiary data regions, for example, a checkpoint or index save will
* contain master index regions (according to the number of zones), an
* index page map region, and possibly an open chapter region.
**/
static const uint64_t REGION_MAGIC = 0x416c6252676e3031; // 'AlbRgn01'
typedef struct regionHeader {
uint64_t magic; // REGION_MAGIC
uint64_t regionBlocks; // size of whole region
uint16_t type; // RH_TYPE_...
uint16_t version; // 1
uint16_t numRegions; // number of layouts in the table
uint16_t payload; // extra data beyond region table
} RegionHeader;
typedef struct layoutRegion {
uint64_t startBlock;
uint64_t numBlocks;
uint32_t checksum; // only used for save regions
uint16_t kind;
uint16_t instance;
} LayoutRegion;
typedef struct regionTable {
RegionHeader header;
LayoutRegion regions[];
} RegionTable;
#endif // LAYOUT_REGION_H