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/*

 *   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_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)

 */

/* mount time flag to disable journaling to disk */

#define JFS_NOINTEGRITY 0x00000010

/* mount time flags for error handling */

#define JFS_ERR_REMOUNT_RO 0x00000002   /* remount read-only */

#define JFS_ERR_CONTINUE   0x00000004   /* continue */

#define JFS_ERR_PANIC      0x00000008   /* panic */

/* 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 */