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/*
 * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef GLOBAL_H
#define GLOBAL_H

/* global_hdr_t - first page of every media file
 */
#define GLOBAL_HDR_SZ		PGSZ
#define GLOBAL_HDR_MAGIC	"xFSdump0"
#define GLOBAL_HDR_MAGIC_SZ	8

#define GLOBAL_HDR_VERSION_0	0
#define GLOBAL_HDR_VERSION_1	1
#define GLOBAL_HDR_VERSION_2	2
	/* version 2 adds encoding of holes and a change to on-tape inventory format.
	 * version 1 adds extended file attribute dumping.
	 * version 0 xfsrestore can't handle media produced
	 * by version 1 xfsdump. 
	 */
#define GLOBAL_HDR_VERSION	GLOBAL_HDR_VERSION_2
#define GLOBAL_HDR_VERSION_PREV	1

#define GLOBAL_HDR_STRING_SZ	0x100
#define GLOBAL_HDR_TIME_SZ	4
#define GLOBAL_HDR_UUID_SZ	0x10

struct global_hdr {
	char gh_magic[ GLOBAL_HDR_MAGIC_SZ ];		/*   8    8 */
		/* unique signature of xfsdump */
	u_int32_t gh_version;				/*   4    c */
		/* header version */
	u_int32_t gh_checksum;				/*   4   10 */
		/* 32-bit unsigned additive inverse of entire header */
	time32_t gh_timestamp;				/*   4   14 */
		/* time32_t of dump */
	char gh_pad1[ 4 ];				/*   4   18 */
		/* alignment */
	u_int64_t gh_ipaddr;				/*   8   20 */
		/* from gethostid(2), room for expansion */
	uuid_t gh_dumpid;				/*  10   30 */
		/* ID of dump session	 */
	char gh_pad2[ 0xd0 ];				/*  d0  100 */
		/* alignment */
	char gh_hostname[ GLOBAL_HDR_STRING_SZ ];	/* 100  200 */
		/* from gethostname(2) */
	char gh_dumplabel[ GLOBAL_HDR_STRING_SZ ];	/* 100  300 */
		/* label of dump session */
	char gh_pad3[ 0x100 ];				/* 100  400 */
		/* padding */
	char gh_upper[ GLOBAL_HDR_SZ - 0x400 ];		/* c00 1000 */
		/* header info private to upper software layers */
};

typedef struct global_hdr global_hdr_t;


/* used by main( ) to allocate and populate a global header template.
 * drive managers will copy this into the write header.
 */
extern global_hdr_t * global_hdr_alloc( intgen_t argc, char *argv[ ] );


/* used by main( ) to free the global header template after drive ini.
 */
extern void global_hdr_free( global_hdr_t *ghdrp );


/* global_hdr_checksum_set - fill in the global media file header checksum.
 * utility function for use by drive-specific strategies.
 */
extern void global_hdr_checksum_set( global_hdr_t *hdrp );


/* global_hdr_checksum_check - check the global media file header checksum.
 * utility function for use by drive-specific strategies.
 * returns BOOL_TRUE if ok, BOOL_FALSE if bad
 */
extern bool_t global_hdr_checksum_check( global_hdr_t *hdrp );

/* global_version_check - if we know this version number, return BOOL_TRUE 
 * else return BOOL_FALSE
 */

extern bool_t global_version_check( u_int32_t version );


#endif /* GLOBAL_H */