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