/*
   *   Copyright (C) International Business Machines Corp., 2000-2003
   *
   *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  #ifndef	_H_JFS_SUPERBLOCK
  #define _H_JFS_SUPERBLOCK
  
  /*
   * make the magic number something a human could read
   */

  #define JFS_MAGIC	"JFS1"	/* Magic word */

  
  #define JFS_VERSION	2	/* Version number: Version 2 */
  
  #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.
   */
  struct jfs_superblock {
  	char s_magic[4];	/* 4: magic number */
  	__le32 s_version;	/* 4: version number */
  
  	__le64 s_size;		/* 8: aggregate size in hardware/LVM blocks;
  				 * VFS: number of blocks
  				 */

  	__le32 s_bsize;		/* 4: aggregate block size in bytes;

  				 * VFS: fragment size
  				 */
  	__le16 s_l2bsize;	/* 2: log2 of s_bsize */
  	__le16 s_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */
  	__le32 s_pbsize;	/* 4: hardware/LVM block size in bytes */
  	__le16 s_l2pbsize;	/* 2: log2 of s_pbsize */
  	__le16 pad;		/* 2: padding necessary for alignment */
  
  	__le32 s_agsize;	/* 4: allocation group size in aggr. blocks */
  
  	__le32 s_flag;		/* 4: aggregate attributes:
  				 *    see jfs_filsys.h
  				 */

  	__le32 s_state;		/* 4: mount/unmount/recovery state:

  				 *    see jfs_filsys.h
  				 */
  	__le32 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
  				 */
  	__le32 s_logdev;		/* 4: device address of log */
  	__le32 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 */
  
  	__le32 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.
  				 */
  	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
  				 *          Only used when s_version is 1
  				 */
  
  	/* extendfs() parameter under s_state & FM_EXTENDFS */
  	__le64 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 */
  
  };
  
  extern int readSuper(struct super_block *, struct buffer_head **);
  extern int updateSuper(struct super_block *, uint);
  extern void jfs_error(struct super_block *, const char *, ...);

  extern int jfs_mount(struct super_block *);
  extern int jfs_mount_rw(struct super_block *, int);
  extern int jfs_umount(struct super_block *);
  extern int jfs_umount_rw(struct super_block *);

  extern int jfs_extendfs(struct super_block *, s64, int);

  extern struct task_struct *jfsIOthread;
  extern struct task_struct *jfsSyncThread;

  #endif /*_H_JFS_SUPERBLOCK */