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* Copyright (C) International Business Machines Corp., 2000-2003
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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 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef _H_JFS_SUPERBLOCK
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#define _H_JFS_SUPERBLOCK
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* make the magic number something a human could read
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#define JFS_MAGIC "JFS1" /* Magic word */
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#define JFS_VERSION 2 /* Version number: Version 2 */
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#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
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* aggregate superblock
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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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struct jfs_superblock {
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char s_magic[4]; /* 4: magic number */
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__le32 s_version; /* 4: version number */
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__le64 s_size; /* 8: aggregate size in hardware/LVM blocks;
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* VFS: number of blocks
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__le32 s_bsize; /* 4: aggregate block size in bytes;
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__le16 s_l2bsize; /* 2: log2 of s_bsize */
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__le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
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__le32 s_pbsize; /* 4: hardware/LVM block size in bytes */
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__le16 s_l2pbsize; /* 2: log2 of s_pbsize */
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__le16 pad; /* 2: padding necessary for alignment */
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__le32 s_agsize; /* 4: allocation group size in aggr. blocks */
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__le32 s_flag; /* 4: aggregate attributes:
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__le32 s_state; /* 4: mount/unmount/recovery state:
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__le32 s_compress; /* 4: > 0 if data compression */
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__le64 s_ait2; /* 8: first extent of secondary
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* aggregate inode table
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__le64 s_aim2; /* 8: first extent of secondary
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__le32 s_logdev; /* 4: device address of log */
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__le32 s_logserial; /* 4: log serial number at aggregate mount */
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__le64 s_logpxd; /* 8: inline log extent */
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__le64 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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__le32 s_fsckloglen; /* 4: Number of filesystem 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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* N.B. These blocks are included in the
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* length field of s_fsckpxd.
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char s_fscklog; /* 1: which fsck service log is most recent
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* 0 => no service log data yet
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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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* Only used when s_version is 1
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/* extendfs() parameter under s_state & FM_EXTENDFS */
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__le64 s_xsize; /* 8: extendfs s_size */
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__le64 s_xfsckpxd; /* 8: extendfs fsckpxd */
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__le64 s_xlogpxd; /* 8: extendfs logpxd */
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/* - 128 byte boundary - */
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char s_uuid[16]; /* 16: 128-bit uuid for volume */
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char s_label[16]; /* 16: volume label */
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char s_loguuid[16]; /* 16: 128-bit uuid for log device */
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#endif /*_H_JFS_SUPERBLOCK */
added
removed
utils/jfs_superblock.h
