1N/A/*
1N/A * Copyright (c) International Business Machines Corp., 2000
1N/A *
1N/A * This program is free software; you can redistribute it and/or modify
1N/A * it under the terms of the GNU General Public License as published by
1N/A * the Free Software Foundation; either version 3 of the License, or
1N/A * (at your option) any later version.
1N/A *
1N/A * This program is distributed in the hope that it will be useful,
1N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of
1N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
1N/A * the GNU General Public License for more details.
1N/A *
1N/A * You should have received a copy of the GNU General Public License
1N/A * along with this program. If not, see <http://www.gnu.org/licenses/>.
1N/A *
1N/A */
1N/A#ifndef _H_JFS_SUPERBLOCK
1N/A#define _H_JFS_SUPERBLOCK
1N/A/*
1N/A * jfs_superblock.h
1N/A */
1N/A
1N/A/*
1N/A * make the magic number something a human could read
1N/A */
1N/A#define JFS_MAGIC "JFS1" /* Magic word: Version 1 */
1N/A
1N/A#define JFS_VERSION 1 /* Version number: Version 1 */
1N/A
1N/A#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
1N/A
1N/A/*
1N/A * aggregate superblock
1N/A *
1N/A * The name superblock is too close to super_block, so the name has been
1N/A * changed to jfs_superblock. The utilities are still using the old name.
1N/A */
1N/A#ifdef _JFS_UTILITY
1N/Astruct superblock
1N/A#else
1N/Astruct jfs_superblock
1N/A#endif
1N/A{
1N/A char s_magic[4]; /* 4: magic number */
1N/A u32 s_version; /* 4: version number */
1N/A
1N/A s64 s_size; /* 8: aggregate size in hardware/LVM blocks;
1N/A * VFS: number of blocks
1N/A */
1N/A s32 s_bsize; /* 4: aggregate block size in bytes;
1N/A * VFS: fragment size
1N/A */
1N/A s16 s_l2bsize; /* 2: log2 of s_bsize */
1N/A s16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
1N/A s32 s_pbsize; /* 4: hardware/LVM block size in bytes */
1N/A s16 s_l2pbsize; /* 2: log2 of s_pbsize */
1N/A s16 pad; /* 2: padding necessary for alignment */
1N/A
1N/A u32 s_agsize; /* 4: allocation group size in aggr. blocks */
1N/A
1N/A u32 s_flag; /* 4: aggregate attributes:
1N/A * see jfs_filsys.h
1N/A */
1N/A u32 s_state; /* 4: mount/unmount/recovery state:
1N/A * see jfs_filsys.h
1N/A */
1N/A s32 s_compress; /* 4: > 0 if data compression */
1N/A
1N/A pxd_t s_ait2; /* 8: first extent of secondary
1N/A * aggregate inode table
1N/A */
1N/A
1N/A pxd_t s_aim2; /* 8: first extent of secondary
1N/A * aggregate inode map
1N/A */
1N/A u32 s_logdev; /* 4: device address of log */
1N/A s32 s_logserial; /* 4: log serial number at aggregate mount */
1N/A pxd_t s_logpxd; /* 8: inline log extent */
1N/A
1N/A pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
1N/A
1N/A struct timestruc_t s_time; /* 8: time last updated */
1N/A
1N/A s32 s_fsckloglen; /* 4: Number of file system blocks reserved for
1N/A * the fsck service log.
1N/A * N.B. These blocks are divided among the
1N/A * versions kept. This is not a per
1N/A * version size.
1N/A * N.B. These blocks are included in the
1N/A * length field of s_fsckpxd.
1N/A */
1N/A s8 s_fscklog; /* 1: which fsck service log is most recent
1N/A * 0 => no service log data yet
1N/A * 1 => the first one
1N/A * 2 => the 2nd one
1N/A */
1N/A char s_fpack[11]; /* 11: file system volume name
1N/A * N.B. This must be 11 bytes to
1N/A * conform with the OS/2 BootSector
1N/A * requirements
1N/A */
1N/A
1N/A /* extendfs() parameter under s_state & FM_EXTENDFS */
1N/A s64 s_xsize; /* 8: extendfs s_size */
1N/A pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
1N/A pxd_t s_xlogpxd; /* 8: extendfs logpxd */
1N/A /* - 128 byte boundary - */
1N/A
1N/A /*
1N/A * DFS VFS support (preliminary)
1N/A */
1N/A char s_attach; /* 1: VFS: flag: set when aggregate is attached
1N/A */
1N/A u8 rsrvd4[7]; /* 7: reserved - set to 0 */
1N/A
1N/A u64 totalUsable; /* 8: VFS: total of 1K blocks which are
1N/A * available to "normal" (non-root) users.
1N/A */
1N/A u64 minFree; /* 8: VFS: # of 1K blocks held in reserve for
1N/A * exclusive use of root. This value can be 0,
1N/A * and if it is then totalUsable will be equal
1N/A * to # of blocks in aggregate. I believe this
1N/A * means that minFree + totalUsable = # blocks.
1N/A * In that case, we don't need to store both
1N/A * totalUsable and minFree since we can compute
1N/A * one from the other. I would guess minFree
1N/A * would be the one we should store, and
1N/A * totalUsable would be the one we should
1N/A * compute. (Just a guess...)
1N/A */
1N/A
1N/A u64 realFree; /* 8: VFS: # of free 1K blocks can be used by
1N/A * "normal" users. It may be this is something
1N/A * we should compute when asked for instead of
1N/A * storing in the superblock. I don't know how
1N/A * often this information is needed.
1N/A */
1N/A /*
1N/A * graffiti area
1N/A */
1N/A};
1N/A
1N/A#endif /*_H_JFS_SUPERBLOCK */