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+/*
+ * Copyright (c) International Business Machines Corp., 2000
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef _H_JFS_SUPERBLOCK
+#define _H_JFS_SUPERBLOCK
+/*
+ * jfs_superblock.h
+ */
+
+/*
+ * make the magic number something a human could read
+ */
+#define JFS_MAGIC "JFS1" /* Magic word: Version 1 */
+
+#define JFS_VERSION 1 /* Version number: Version 1 */
+
+#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
+
+/*
+ * 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.
+ */
+#ifdef _JFS_UTILITY
+struct superblock
+#else
+struct jfs_superblock
+#endif
+{
+ char s_magic[4]; /* 4: magic number */
+ u32 s_version; /* 4: version number */
+
+ s64 s_size; /* 8: aggregate size in hardware/LVM blocks;
+ * VFS: number of blocks
+ */
+ s32 s_bsize; /* 4: aggregate block size in bytes;
+ * VFS: fragment size
+ */
+ s16 s_l2bsize; /* 2: log2 of s_bsize */
+ s16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
+ s32 s_pbsize; /* 4: hardware/LVM block size in bytes */
+ s16 s_l2pbsize; /* 2: log2 of s_pbsize */
+ s16 pad; /* 2: padding necessary for alignment */
+
+ u32 s_agsize; /* 4: allocation group size in aggr. blocks */
+
+ u32 s_flag; /* 4: aggregate attributes:
+ * see jfs_filsys.h
+ */
+ u32 s_state; /* 4: mount/unmount/recovery state:
+ * see jfs_filsys.h
+ */
+ s32 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
+ */
+ u32 s_logdev; /* 4: device address of log */
+ s32 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 */
+
+ s32 s_fsckloglen; /* 4: Number of file system 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.
+ */
+ s8 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
+ */
+
+ /* extendfs() parameter under s_state & FM_EXTENDFS */
+ s64 s_xsize; /* 8: extendfs s_size */
+ pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
+ pxd_t s_xlogpxd; /* 8: extendfs logpxd */
+ /* - 128 byte boundary - */
+
+ /*
+ * DFS VFS support (preliminary)
+ */
+ char s_attach; /* 1: VFS: flag: set when aggregate is attached
+ */
+ u8 rsrvd4[7]; /* 7: reserved - set to 0 */
+
+ u64 totalUsable; /* 8: VFS: total of 1K blocks which are
+ * available to "normal" (non-root) users.
+ */
+ u64 minFree; /* 8: VFS: # of 1K blocks held in reserve for
+ * exclusive use of root. This value can be 0,
+ * and if it is then totalUsable will be equal
+ * to # of blocks in aggregate. I believe this
+ * means that minFree + totalUsable = # blocks.
+ * In that case, we don't need to store both
+ * totalUsable and minFree since we can compute
+ * one from the other. I would guess minFree
+ * would be the one we should store, and
+ * totalUsable would be the one we should
+ * compute. (Just a guess...)
+ */
+
+ u64 realFree; /* 8: VFS: # of free 1K blocks can be used by
+ * "normal" users. It may be this is something
+ * we should compute when asked for instead of
+ * storing in the superblock. I don't know how
+ * often this information is needed.
+ */
+ /*
+ * graffiti area
+ */
+};
+
+#endif /*_H_JFS_SUPERBLOCK */