FreeBSD/Linux Kernel Cross Reference
sys/fs/jfs/jfs_superblock.h

     /*
      *   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 */

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