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jfs_filsys.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_FILSYS
#define _H_JFS_FILSYS

/*
 *    jfs_filsys.h
 *
 * file system (implementation-dependent) constants
 *
 * refer to <limits.h> for system wide implementation-dependent constants
 */

#include "jfs_types.h"

/*
 *     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 */

/* 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       ((int64_t)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"

/*
 * 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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