linux/fs/jfs/jfs_filsys.h
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   1/*
   2 *   Copyright (C) International Business Machines Corp., 2000-2003
   3 *
   4 *   This program is free software;  you can redistribute it and/or modify
   5 *   it under the terms of the GNU General Public License as published by
   6 *   the Free Software Foundation; either version 2 of the License, or
   7 *   (at your option) any later version.
   8 *
   9 *   This program is distributed in the hope that it will be useful,
  10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  12 *   the GNU General Public License for more details.
  13 *
  14 *   You should have received a copy of the GNU General Public License
  15 *   along with this program;  if not, write to the Free Software
  16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 */
  18#ifndef _H_JFS_FILSYS
  19#define _H_JFS_FILSYS
  20
  21/*
  22 *      jfs_filsys.h
  23 *
  24 * file system (implementation-dependent) constants
  25 *
  26 * refer to <limits.h> for system wide implementation-dependent constants
  27 */
  28
  29/*
  30 *       file system option (superblock flag)
  31 */
  32
  33/* directory option */
  34#define JFS_UNICODE     0x00000001      /* unicode name */
  35
  36/* mount time flags for error handling */
  37#define JFS_ERR_REMOUNT_RO 0x00000002   /* remount read-only */
  38#define JFS_ERR_CONTINUE   0x00000004   /* continue */
  39#define JFS_ERR_PANIC      0x00000008   /* panic */
  40
  41/* Quota support */
  42#define JFS_USRQUOTA    0x00000010
  43#define JFS_GRPQUOTA    0x00000020
  44
  45/* mount time flag to disable journaling to disk */
  46#define JFS_NOINTEGRITY 0x00000040
  47
  48/* mount time flag to enable TRIM to ssd disks */
  49#define JFS_DISCARD     0x00000080
  50
  51/* commit option */
  52#define JFS_COMMIT      0x00000f00      /* commit option mask */
  53#define JFS_GROUPCOMMIT 0x00000100      /* group (of 1) commit */
  54#define JFS_LAZYCOMMIT  0x00000200      /* lazy commit */
  55#define JFS_TMPFS       0x00000400      /* temporary file system -
  56                                         * do not log/commit:
  57                                         * Never implemented
  58                                         */
  59
  60/* log logical volume option */
  61#define JFS_INLINELOG   0x00000800      /* inline log within file system */
  62#define JFS_INLINEMOVE  0x00001000      /* inline log being moved */
  63
  64/* Secondary aggregate inode table */
  65#define JFS_BAD_SAIT    0x00010000      /* current secondary ait is bad */
  66
  67/* sparse regular file support */
  68#define JFS_SPARSE      0x00020000      /* sparse regular file */
  69
  70/* DASD Limits          F226941 */
  71#define JFS_DASD_ENABLED 0x00040000     /* DASD limits enabled */
  72#define JFS_DASD_PRIME  0x00080000      /* Prime DASD usage on boot */
  73
  74/* big endian flag */
  75#define JFS_SWAP_BYTES  0x00100000      /* running on big endian computer */
  76
  77/* Directory index */
  78#define JFS_DIR_INDEX   0x00200000      /* Persistent index for */
  79
  80/* platform options */
  81#define JFS_LINUX       0x10000000      /* Linux support */
  82#define JFS_DFS         0x20000000      /* DCE DFS LFS support */
  83/*      Never implemented */
  84
  85#define JFS_OS2         0x40000000      /* OS/2 support */
  86/*      case-insensitive name/directory support */
  87
  88#define JFS_AIX         0x80000000      /* AIX support */
  89
  90/*
  91 *      buffer cache configuration
  92 */
  93/* page size */
  94#ifdef PSIZE
  95#undef PSIZE
  96#endif
  97#define PSIZE           4096    /* page size (in byte) */
  98#define L2PSIZE         12      /* log2(PSIZE) */
  99#define POFFSET         4095    /* offset within page */
 100
 101/* buffer page size */
 102#define BPSIZE  PSIZE
 103
 104/*
 105 *      fs fundamental size
 106 *
 107 * PSIZE >= file system block size >= PBSIZE >= DISIZE
 108 */
 109#define PBSIZE          512     /* physical block size (in byte) */
 110#define L2PBSIZE        9       /* log2(PBSIZE) */
 111
 112#define DISIZE          512     /* on-disk inode size (in byte) */
 113#define L2DISIZE        9       /* log2(DISIZE) */
 114
 115#define IDATASIZE       256     /* inode inline data size */
 116#define IXATTRSIZE      128     /* inode inline extended attribute size */
 117
 118#define XTPAGE_SIZE     4096
 119#define log2_PAGESIZE   12
 120
 121#define IAG_SIZE        4096
 122#define IAG_EXTENT_SIZE 4096
 123#define INOSPERIAG      4096    /* number of disk inodes per iag */
 124#define L2INOSPERIAG    12      /* l2 number of disk inodes per iag */
 125#define INOSPEREXT      32      /* number of disk inode per extent */
 126#define L2INOSPEREXT    5       /* l2 number of disk inode per extent */
 127#define IXSIZE          (DISIZE * INOSPEREXT)   /* inode extent size */
 128#define INOSPERPAGE     8       /* number of disk inodes per 4K page */
 129#define L2INOSPERPAGE   3       /* log2(INOSPERPAGE) */
 130
 131#define IAGFREELIST_LWM 64
 132
 133#define INODE_EXTENT_SIZE       IXSIZE  /* inode extent size */
 134#define NUM_INODE_PER_EXTENT    INOSPEREXT
 135#define NUM_INODE_PER_IAG       INOSPERIAG
 136
 137#define MINBLOCKSIZE            512
 138#define MAXBLOCKSIZE            4096
 139#define MAXFILESIZE             ((s64)1 << 52)
 140
 141#define JFS_LINK_MAX            0xffffffff
 142
 143/* Minimum number of bytes supported for a JFS partition */
 144#define MINJFS                  (0x1000000)
 145#define MINJFSTEXT              "16"
 146
 147/*
 148 * file system block size -> physical block size
 149 */
 150#define LBOFFSET(x)     ((x) & (PBSIZE - 1))
 151#define LBNUMBER(x)     ((x) >> L2PBSIZE)
 152#define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
 153#define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
 154/* size in byte -> last page number */
 155#define SIZE2PN(size)   ( ((s64)((size) - 1)) >> (L2PSIZE) )
 156/* size in byte -> last file system block number */
 157#define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
 158
 159/*
 160 * fixed physical block address (physical block size = 512 byte)
 161 *
 162 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
 163 *       these macros should be removed and the byte offset macros used instead.
 164 */
 165#define SUPER1_B        64      /* primary superblock */
 166#define AIMAP_B         (SUPER1_B + 8)  /* 1st extent of aggregate inode map */
 167#define AITBL_B         (AIMAP_B + 16)  /*
 168                                         * 1st extent of aggregate inode table
 169                                         */
 170#define SUPER2_B        (AITBL_B + 32)  /* 2ndary superblock pbn */
 171#define BMAP_B          (SUPER2_B + 8)  /* block allocation map */
 172
 173/*
 174 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
 175 * superblock.  This is not the same as the superblock structure, since all of
 176 * this space is not currently being used.
 177 */
 178#define SIZE_OF_SUPER   PSIZE
 179
 180/*
 181 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
 182 */
 183#define SIZE_OF_AG_TABLE        PSIZE
 184
 185/*
 186 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
 187 * the inode allocation map (to hold iag)
 188 */
 189#define SIZE_OF_MAP_PAGE        PSIZE
 190
 191/*
 192 * fixed byte offset address
 193 */
 194#define SUPER1_OFF      0x8000  /* primary superblock */
 195#define AIMAP_OFF       (SUPER1_OFF + SIZE_OF_SUPER)
 196                                        /*
 197                                         * Control page of aggregate inode map
 198                                         * followed by 1st extent of map
 199                                         */
 200#define AITBL_OFF       (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
 201                                        /*
 202                                         * 1st extent of aggregate inode table
 203                                         */
 204#define SUPER2_OFF      (AITBL_OFF + INODE_EXTENT_SIZE)
 205                                        /*
 206                                         * secondary superblock
 207                                         */
 208#define BMAP_OFF        (SUPER2_OFF + SIZE_OF_SUPER)
 209                                        /*
 210                                         * block allocation map
 211                                         */
 212
 213/*
 214 * The following macro is used to indicate the number of reserved disk blocks at
 215 * the front of an aggregate, in terms of physical blocks.  This value is
 216 * currently defined to be 32K.  This turns out to be the same as the primary
 217 * superblock's address, since it directly follows the reserved blocks.
 218 */
 219#define AGGR_RSVD_BLOCKS        SUPER1_B
 220
 221/*
 222 * The following macro is used to indicate the number of reserved bytes at the
 223 * front of an aggregate.  This value is currently defined to be 32K.  This
 224 * turns out to be the same as the primary superblock's byte offset, since it
 225 * directly follows the reserved blocks.
 226 */
 227#define AGGR_RSVD_BYTES SUPER1_OFF
 228
 229/*
 230 * The following macro defines the byte offset for the first inode extent in
 231 * the aggregate inode table.  This allows us to find the self inode to find the
 232 * rest of the table.  Currently this value is 44K.
 233 */
 234#define AGGR_INODE_TABLE_START  AITBL_OFF
 235
 236/*
 237 *      fixed reserved inode number
 238 */
 239/* aggregate inode */
 240#define AGGR_RESERVED_I 0       /* aggregate inode (reserved) */
 241#define AGGREGATE_I     1       /* aggregate inode map inode */
 242#define BMAP_I          2       /* aggregate block allocation map inode */
 243#define LOG_I           3       /* aggregate inline log inode */
 244#define BADBLOCK_I      4       /* aggregate bad block inode */
 245#define FILESYSTEM_I    16      /* 1st/only fileset inode in ait:
 246                                 * fileset inode map inode
 247                                 */
 248
 249/* per fileset inode */
 250#define FILESET_RSVD_I  0       /* fileset inode (reserved) */
 251#define FILESET_EXT_I   1       /* fileset inode extension */
 252#define ROOT_I          2       /* fileset root inode */
 253#define ACL_I           3       /* fileset ACL inode */
 254
 255#define FILESET_OBJECT_I 4      /* the first fileset inode available for a file
 256                                 * or directory or link...
 257                                 */
 258#define FIRST_FILESET_INO 16    /* the first aggregate inode which describes
 259                                 * an inode.  (To fsck this is also the first
 260                                 * inode in part 2 of the agg inode table.)
 261                                 */
 262
 263/*
 264 *      directory configuration
 265 */
 266#define JFS_NAME_MAX    255
 267#define JFS_PATH_MAX    BPSIZE
 268
 269
 270/*
 271 *      file system state (superblock state)
 272 */
 273#define FM_CLEAN 0x00000000     /* file system is unmounted and clean */
 274#define FM_MOUNT 0x00000001     /* file system is mounted cleanly */
 275#define FM_DIRTY 0x00000002     /* file system was not unmounted and clean
 276                                 * when mounted or
 277                                 * commit failure occurred while being mounted:
 278                                 * fsck() must be run to repair
 279                                 */
 280#define FM_LOGREDO 0x00000004   /* log based recovery (logredo()) failed:
 281                                 * fsck() must be run to repair
 282                                 */
 283#define FM_EXTENDFS 0x00000008  /* file system extendfs() in progress */
 284
 285#endif                          /* _H_JFS_FILSYS */
 286
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