patch-2.4.20 linux-2.4.20/fs/jfs/jfs_superblock.h

• Lines: 113
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/jfs_superblock.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/jfs_superblock.h linux-2.4.20/fs/jfs/jfs_superblock.h
@@ -0,0 +1,112 @@
+/*
+ *   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., 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 */
+	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 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 */
+	s64 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);
+
+#endif /*_H_JFS_SUPERBLOCK */