[net-next-2.6.git] / fs / jfs / jfs_superblock.h

/*
 *   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 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) International Business Machines Corp., 2000-2003
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
63f83c9f	6	* the Free Software Foundation; either version 2 of the License, or
1da177e4	7	* (at your option) any later version.
63f83c9f	8	*
1da177e4 LT	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	12	* the GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
63f83c9f	15	* along with this program; if not, write to the Free Software
1da177e4 LT	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18	#ifndef _H_JFS_SUPERBLOCK
	19	#define _H_JFS_SUPERBLOCK
	20
	21	/*
	22	* make the magic number something a human could read
	23	*/
63f83c9f	24	#define JFS_MAGIC "JFS1" /* Magic word */
1da177e4 LT	25
	26	#define JFS_VERSION 2 /* Version number: Version 2 */
	27
	28	#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
	29
63f83c9f DK	30	/*
63f83c9f DK	31	* aggregate superblock
1da177e4 LT	32	*
	33	* The name superblock is too close to super_block, so the name has been
	34	* changed to jfs_superblock. The utilities are still using the old name.
	35	*/
	36	struct jfs_superblock {
	37	char s_magic[4]; /* 4: magic number */
	38	__le32 s_version; /* 4: version number */
	39
	40	__le64 s_size; /* 8: aggregate size in hardware/LVM blocks;
	41	* VFS: number of blocks
	42	*/
63f83c9f	43	__le32 s_bsize; /* 4: aggregate block size in bytes;
1da177e4 LT	44	* VFS: fragment size
	45	*/
	46	__le16 s_l2bsize; /* 2: log2 of s_bsize */
	47	__le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
	48	__le32 s_pbsize; /* 4: hardware/LVM block size in bytes */
	49	__le16 s_l2pbsize; /* 2: log2 of s_pbsize */
	50	__le16 pad; /* 2: padding necessary for alignment */
	51
	52	__le32 s_agsize; /* 4: allocation group size in aggr. blocks */
	53
	54	__le32 s_flag; /* 4: aggregate attributes:
	55	* see jfs_filsys.h
	56	*/
63f83c9f	57	__le32 s_state; /* 4: mount/unmount/recovery state:
1da177e4 LT	58	* see jfs_filsys.h
	59	*/
	60	__le32 s_compress; /* 4: > 0 if data compression */
	61
	62	pxd_t s_ait2; /* 8: first extent of secondary
	63	* aggregate inode table
	64	*/
	65
	66	pxd_t s_aim2; /* 8: first extent of secondary
	67	* aggregate inode map
	68	*/
	69	__le32 s_logdev; /* 4: device address of log */
	70	__le32 s_logserial; /* 4: log serial number at aggregate mount */
	71	pxd_t s_logpxd; /* 8: inline log extent */
	72
	73	pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
	74
	75	struct timestruc_t s_time; /* 8: time last updated */
	76
	77	__le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for
63f83c9f	78	* the fsck service log.
1da177e4 LT	79	* N.B. These blocks are divided among the
	80	* versions kept. This is not a per
	81	* version size.
63f83c9f	82	* N.B. These blocks are included in the
1da177e4 LT	83	* length field of s_fsckpxd.
	84	*/
	85	s8 s_fscklog; /* 1: which fsck service log is most recent
	86	* 0 => no service log data yet
	87	* 1 => the first one
	88	* 2 => the 2nd one
	89	*/
63f83c9f	90	char s_fpack[11]; /* 11: file system volume name
1da177e4 LT	91	* N.B. This must be 11 bytes to
	92	* conform with the OS/2 BootSector
	93	* requirements
	94	* Only used when s_version is 1
	95	*/
	96
	97	/* extendfs() parameter under s_state & FM_EXTENDFS */
	98	__le64 s_xsize; /* 8: extendfs s_size */
	99	pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
	100	pxd_t s_xlogpxd; /* 8: extendfs logpxd */
	101	/* - 128 byte boundary - */
	102
	103	char s_uuid[16]; /* 16: 128-bit uuid for volume */
	104	char s_label[16]; /* 16: volume label */
	105	char s_loguuid[16]; /* 16: 128-bit uuid for log device */
	106
	107	};
	108
	109	extern int readSuper(struct super_block , struct buffer_head *);
	110	extern int updateSuper(struct super_block *, uint);
	111	extern void jfs_error(struct super_block , const char , ...);
1868f4aa DK	112	extern int jfs_mount(struct super_block *);
	113	extern int jfs_mount_rw(struct super_block *, int);
	114	extern int jfs_umount(struct super_block *);
	115	extern int jfs_umount_rw(struct super_block *);
1868f4aa	116	extern int jfs_extendfs(struct super_block *, s64, int);
1da177e4	117
91dbb4de CH	118	extern struct task_struct *jfsIOthread;
	119	extern struct task_struct *jfsSyncThread;
	120
1da177e4	121	#endif /_H_JFS_SUPERBLOCK /