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authorChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
commit9928d99936105b4653d2d1b8ca74dc3ffba5c71e (patch)
tree06aa4f5e9f0055027c6fb54dd47a8414cf2fba32 /src/jfs_superblock.h
First version in git
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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 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 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 */