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

     /*
      *   Copyright (c) International Business Machines Corp., 2000-2001
      *
      *   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_FILSYS
    #define _H_JFS_FILSYS
    
    /*
     *      jfs_filsys.h
     *
     * file system (implementation-dependent) constants 
     *
     * refer to <limits.h> for system wide implementation-dependent constants 
     */
    
    /*
     *       file system option (superblock flag)
     */
    /* platform option (conditional compilation) */
    #define JFS_AIX         0x80000000      /* AIX support */
    /*      POSIX name/directory  support */
    
    #define JFS_OS2         0x40000000      /* OS/2 support */
    /*      case-insensitive name/directory support */
    
    #define JFS_DFS         0x20000000      /* DCE DFS LFS support */
    
    #define JFS_LINUX       0x10000000      /* Linux support */
    /*      case-sensitive name/directory support */
    
    /* directory option */
    #define JFS_UNICODE     0x00000001      /* unicode name */
    
    /* commit option */
    #define JFS_COMMIT      0x00000f00      /* commit option mask */
    #define JFS_GROUPCOMMIT 0x00000100      /* group (of 1) commit */
    #define JFS_LAZYCOMMIT  0x00000200      /* lazy commit */
    #define JFS_TMPFS       0x00000400      /* temporary file system - 
                                             * do not log/commit:
                                             */
    
    /* log logical volume option */
    #define JFS_INLINELOG   0x00000800      /* inline log within file system */
    #define JFS_INLINEMOVE  0x00001000      /* inline log being moved */
    
    /* Secondary aggregate inode table */
    #define JFS_BAD_SAIT    0x00010000      /* current secondary ait is bad */
    
    /* sparse regular file support */
    #define JFS_SPARSE      0x00020000      /* sparse regular file */
    
    /* DASD Limits          F226941 */
    #define JFS_DASD_ENABLED        0x00040000      /* DASD limits enabled */
    #define JFS_DASD_PRIME          0x00080000      /* Prime DASD usage on boot */
    
    /* big endian flag */
    #define JFS_SWAP_BYTES          0x00100000      /* running on big endian computer */
    
    /* Directory index */
    #define JFS_DIR_INDEX           0x00200000      /* Persistant index for */
                                                    /* directory entries    */
    
    
    /*
     *      buffer cache configuration
     */
    /* page size */
    #ifdef PSIZE
    #undef PSIZE
    #endif
    #define PSIZE           4096    /* page size (in byte) */
    #define L2PSIZE         12      /* log2(PSIZE) */
    #define POFFSET         4095    /* offset within page */
    
    /* buffer page size */
    #define BPSIZE  PSIZE
    
    /*
     *      fs fundamental size
     *
     * PSIZE >= file system block size >= PBSIZE >= DISIZE
     */
    #define PBSIZE          512     /* physical block size (in byte) */
    #define L2PBSIZE        9       /* log2(PBSIZE) */
    
    #define DISIZE          512     /* on-disk inode size (in byte) */
   #define L2DISIZE        9       /* log2(DISIZE) */
   
   #define IDATASIZE       256     /* inode inline data size */
   #define IXATTRSIZE      128     /* inode inline extended attribute size */
   
   #define XTPAGE_SIZE     4096
   #define log2_PAGESIZE     12
   
   #define IAG_SIZE        4096
   #define IAG_EXTENT_SIZE 4096
   #define INOSPERIAG      4096    /* number of disk inodes per iag */
   #define L2INOSPERIAG    12      /* l2 number of disk inodes per iag */
   #define INOSPEREXT      32      /* number of disk inode per extent */
   #define L2INOSPEREXT    5       /* l2 number of disk inode per extent */
   #define IXSIZE          (DISIZE * INOSPEREXT)   /* inode extent size */
   #define INOSPERPAGE     8       /* number of disk inodes per 4K page */
   #define L2INOSPERPAGE   3       /* log2(INOSPERPAGE) */
   
   #define IAGFREELIST_LWM 64
   
   #define INODE_EXTENT_SIZE       IXSIZE  /* inode extent size */
   #define NUM_INODE_PER_EXTENT    INOSPEREXT
   #define NUM_INODE_PER_IAG       INOSPERIAG
   
   #define MINBLOCKSIZE            512
   #define MAXBLOCKSIZE            4096
   #define MAXFILESIZE             ((s64)1 << 52)
   
   #define JFS_LINK_MAX            65535   /* nlink_t is unsigned short */
   
   /* Minimum number of bytes supported for a JFS partition */
   #define MINJFS                  (0x1000000)
   #define MINJFSTEXT              "16"
   
   /*
    * file system block size -> physical block size
    */
   #define LBOFFSET(x)     ((x) & (PBSIZE - 1))
   #define LBNUMBER(x)     ((x) >> L2PBSIZE)
   #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
   #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
   /* size in byte -> last page number */
   #define SIZE2PN(size)   ( ((s64)((size) - 1)) >> (L2PSIZE) )
   /* size in byte -> last file system block number */
   #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
   
   /*
    * fixed physical block address (physical block size = 512 byte)
    *
    * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
    *       these macros should be removed and the byte offset macros used instead.
    */
   #define SUPER1_B        64      /* primary superblock */
   #define AIMAP_B         (SUPER1_B + 8)  /* 1st extent of aggregate inode map */
   #define AITBL_B         (AIMAP_B + 16)  /*
                                            * 1st extent of aggregate inode table
                                            */
   #define SUPER2_B        (AITBL_B + 32)  /* 2ndary superblock pbn */
   #define BMAP_B          (SUPER2_B + 8)  /* block allocation map */
   
   /*
    * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
    * superblock.  This is not the same as the superblock structure, since all of
    * this space is not currently being used.
    */
   #define SIZE_OF_SUPER   PSIZE
   
   /*
    * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
    */
   #define SIZE_OF_AG_TABLE        PSIZE
   
   /*
    * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
    * the inode allocation map (to hold iag)
    */
   #define SIZE_OF_MAP_PAGE        PSIZE
   
   /*
    * fixed byte offset address
    */
   #define SUPER1_OFF      0x8000  /* primary superblock */
   #define AIMAP_OFF       (SUPER1_OFF + SIZE_OF_SUPER)
                                           /*
                                            * Control page of aggregate inode map
                                            * followed by 1st extent of map
                                            */
   #define AITBL_OFF       (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
                                           /* 
                                            * 1st extent of aggregate inode table
                                            */
   #define SUPER2_OFF      (AITBL_OFF + INODE_EXTENT_SIZE)
                                           /*
                                            * secondary superblock
                                            */
   #define BMAP_OFF        (SUPER2_OFF + SIZE_OF_SUPER)
                                           /*
                                            * block allocation map
                                            */
   
   /*
    * The following macro is used to indicate the number of reserved disk blocks at
    * the front of an aggregate, in terms of physical blocks.  This value is
    * currently defined to be 32K.  This turns out to be the same as the primary
    * superblock's address, since it directly follows the reserved blocks.
    */
   #define AGGR_RSVD_BLOCKS        SUPER1_B
   
   /*
    * The following macro is used to indicate the number of reserved bytes at the
    * front of an aggregate.  This value is currently defined to be 32K.  This
    * turns out to be the same as the primary superblock's byte offset, since it
    * directly follows the reserved blocks.
    */
   #define AGGR_RSVD_BYTES SUPER1_OFF
   
   /*
    * The following macro defines the byte offset for the first inode extent in
    * the aggregate inode table.  This allows us to find the self inode to find the
    * rest of the table.  Currently this value is 44K.
    */
   #define AGGR_INODE_TABLE_START  AITBL_OFF
   
   /*
    *      fixed reserved inode number
    */
   /* aggregate inode */
   #define AGGR_RESERVED_I 0       /* aggregate inode (reserved) */
   #define AGGREGATE_I     1       /* aggregate inode map inode */
   #define BMAP_I          2       /* aggregate block allocation map inode */
   #define LOG_I           3       /* aggregate inline log inode */
   #define BADBLOCK_I      4       /* aggregate bad block inode */
   #define FILESYSTEM_I    16      /* 1st/only fileset inode in ait:
                                    * fileset inode map inode
                                    */
   
   /* per fileset inode */
   #define FILESET_RSVD_I  0       /* fileset inode (reserved) */
   #define FILESET_EXT_I   1       /* fileset inode extension */
   #define ROOT_I          2       /* fileset root inode */
   #define ACL_I           3       /* fileset ACL inode */
   
   #define FILESET_OBJECT_I 4      /* the first fileset inode available for a file
                                    * or directory or link...
                                    */
   #define FIRST_FILESET_INO 16    /* the first aggregate inode which describes
                                    * an inode.  (To fsck this is also the first
                                    * inode in part 2 of the agg inode table.)
                                    */
   
   /*
    *      directory configuration
    */
   #define JFS_NAME_MAX    255
   #define JFS_PATH_MAX    BPSIZE
   
   
   /*
    *      file system state (superblock state)
    */
   #define FM_CLEAN 0x00000000     /* file system is unmounted and clean */
   #define FM_MOUNT 0x00000001     /* file system is mounted cleanly */
   #define FM_DIRTY 0x00000002     /* file system was not unmounted and clean 
                                    * when mounted or 
                                    * commit failure occurred while being mounted:
                                    * fsck() must be run to repair 
                                    */
   #define FM_LOGREDO 0x00000004   /* log based recovery (logredo()) failed:
                                    * fsck() must be run to repair 
                                    */
   #define FM_EXTENDFS 0x00000008  /* file system extendfs() in progress */
   
   #endif                          /* _H_JFS_FILSYS */

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