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/*
* File: jfs_superblock.h
* Copyright (C) 2004 Christophe GRENIER <grenier@cgsecurity.org>
* Copyright (c) International Business Machines Corp., 2000-2002
*
* 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
*/
#ifndef _JFS_SUPERBLOCK_H
#define _JFS_SUPERBLOCK_H
/*
* make the magic number something a human could read
*/
#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
#define JFS_VERSION 2 /* Version number: Version 2 */
#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
/*
* physical xd (pxd)
*/
typedef struct {
unsigned len:24;
unsigned addr1:8;
uint32_t addr2;
} pxd_t;
/*
* Almost identical to Linux's timespec, but not quite
*/
struct jfs_timestruc_t {
uint32_t tv_sec;
uint32_t tv_nsec;
};
/*
* aggregate superblock
*
* The name superblock is too close to super_block, so the name has been
* changed to jfs_superblock. The utilities are still using the old name.
*/
struct jfs_superblock {
char s_magic[4]; /* 4: magic number */
uint32_t s_version; /* 4: version number */
int64_t s_size; /* 8: aggregate size in hardware/LVM blocks;
* VFS: number of blocks
*/
int32_t s_bsize; /* 4: aggregate block size in bytes;
* VFS: fragment size
*/
int16_t s_l2bsize; /* 2: log2 of s_bsize */
int16_t s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
int32_t s_pbsize; /* 4: hardware/LVM block size in bytes */
int16_t s_l2pbsize; /* 2: log2 of s_pbsize */
int16_t pad; /* 2: padding necessary for alignment */
uint32_t s_agsize; /* 4: allocation group size in aggr. blocks */
uint32_t s_flag; /* 4: aggregate attributes:
* see jfs_filsys.h
*/
uint32_t s_state; /* 4: mount/unmount/recovery state:
* see jfs_filsys.h
*/
int32_t s_compress; /* 4: > 0 if data compression */
pxd_t s_ait2; /* 8: first extent of secondary
* aggregate inode table
*/
pxd_t s_aim2; /* 8: first extent of secondary
* aggregate inode map
*/
uint32_t s_logdev; /* 4: device address of log */
int32_t s_logserial; /* 4: log serial number at aggregate mount */
pxd_t s_logpxd; /* 8: inline log extent */
pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
struct jfs_timestruc_t s_time; /* 8: time last updated */
int32_t s_fsckloglen; /* 4: Number of filesystem blocks reserved for
* the fsck service log.
* N.B. These blocks are divided among the
* versions kept. This is not a per
* version size.
* N.B. These blocks are included in the
* length field of s_fsckpxd.
*/
int8_t s_fscklog; /* 1: which fsck service log is most recent
* 0 => no service log data yet
* 1 => the first one
* 2 => the 2nd one
*/
char s_fpack[11]; /* 11: file system volume name
* N.B. This must be 11 bytes to
* conform with the OS/2 BootSector
* requirements
* Only used when s_version is 1
*/
/* extendfs() parameter under s_state & FM_EXTENDFS */
int64_t s_xsize; /* 8: extendfs s_size */
pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
pxd_t s_xlogpxd; /* 8: extendfs logpxd */
/* - 128 byte boundary - */
char s_uuid[16]; /* 16: 128-bit uuid for volume */
char s_label[16]; /* 16: volume label */
char s_loguuid[16]; /* 16: 128-bit uuid for log device */
};
#endif /*_JFS_SUPERBLOCK_H */
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