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/* commit option */
  49#define JFS_COMMIT      0x00000f00      /* commit option mask */
  50#define JFS_GROUPCOMMIT 0x00000100      /* group (of 1) commit */
  51#define JFS_LAZYCOMMIT  0x00000200      /* lazy commit */
  52#define JFS_TMPFS       0x00000400      /* temporary file system -
  53                                         * do not log/commit:
  54                                         * Never implemented
  55                                         */
  56
  57/* log logical volume option */
  58#define JFS_INLINELOG   0x00000800      /* inline log within file system */
  59#define JFS_INLINEMOVE  0x00001000      /* inline log being moved */
  60
  61/* Secondary aggregate inode table */
  62#define JFS_BAD_SAIT    0x00010000      /* current secondary ait is bad */
  63
  64/* sparse regular file support */
  65#define JFS_SPARSE      0x00020000      /* sparse regular file */
  66
  67/* DASD Limits          F226941 */
  68#define JFS_DASD_ENABLED 0x00040000     /* DASD limits enabled */
  69#define JFS_DASD_PRIME  0x00080000      /* Prime DASD usage on boot */
  70
  71/* big endian flag */
  72#define JFS_SWAP_BYTES  0x00100000      /* running on big endian computer */
  73
  74/* Directory index */
  75#define JFS_DIR_INDEX   0x00200000      /* Persistent index for */
  76
  77/* platform options */
  78#define JFS_LINUX       0x10000000      /* Linux support */
  79#define JFS_DFS         0x20000000      /* DCE DFS LFS support */
  80/*      Never implemented */
  81
  82#define JFS_OS2         0x40000000      /* OS/2 support */
  83/*      case-insensitive name/directory support */
  84
  85#define JFS_AIX         0x80000000      /* AIX support */
  86
  87/*
  88 *      buffer cache configuration
  89 */
  90/* page size */
  91#ifdef PSIZE
  92#undef PSIZE
  93#endif
  94#define PSIZE           4096    /* page size (in byte) */
  95#define L2PSIZE         12      /* log2(PSIZE) */
  96#define POFFSET         4095    /* offset within page */
  97
  98/* buffer page size */
  99#define BPSIZE  PSIZE
 100
 101/*
 102 *      fs fundamental size
 103 *
 104 * PSIZE >= file system block size >= PBSIZE >= DISIZE
 105 */
 106#define PBSIZE          512     /* physical block size (in byte) */
 107#define L2PBSIZE        9       /* log2(PBSIZE) */
 108
 109#define DISIZE          512     /* on-disk inode size (in byte) */
 110#define L2DISIZE        9       /* log2(DISIZE) */
 111
 112#define IDATASIZE       256     /* inode inline data size */
 113#define IXATTRSIZE      128     /* inode inline extended attribute size */
 114
 115#define XTPAGE_SIZE     4096
 116#define log2_PAGESIZE   12
 117
 118#define IAG_SIZE        4096
 119#define IAG_EXTENT_SIZE 4096
 120#define INOSPERIAG      4096    /* number of disk inodes per iag */
 121#define L2INOSPERIAG    12      /* l2 number of disk inodes per iag */
 122#define INOSPEREXT      32      /* number of disk inode per extent */
 123#define L2INOSPEREXT    5       /* l2 number of disk inode per extent */
 124#define IXSIZE          (DISIZE * INOSPEREXT)   /* inode extent size */
 125#define INOSPERPAGE     8       /* number of disk inodes per 4K page */
 126#define L2INOSPERPAGE   3       /* log2(INOSPERPAGE) */
 127
 128#define IAGFREELIST_LWM 64
 129
 130#define INODE_EXTENT_SIZE       IXSIZE  /* inode extent size */
 131#define NUM_INODE_PER_EXTENT    INOSPEREXT
 132#define NUM_INODE_PER_IAG       INOSPERIAG
 133
 134#define MINBLOCKSIZE            512
 135#define MAXBLOCKSIZE            4096
 136#define MAXFILESIZE             ((s64)1 << 52)
 137
 138#define JFS_LINK_MAX            0xffffffff
 139
 140/* Minimum number of bytes supported for a JFS partition */
 141#define MINJFS                  (0x1000000)
 142#define MINJFSTEXT              "16"
 143
 144/*
 145 * file system block size -> physical block size
 146 */
 147#define LBOFFSET(x)     ((x) & (PBSIZE - 1))
 148#define LBNUMBER(x)     ((x) >> L2PBSIZE)
 149#define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
 150#define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
 151/* size in byte -> last page number */
 152#define SIZE2PN(size)   ( ((s64)((size) - 1)) >> (L2PSIZE) )
 153/* size in byte -> last file system block number */
 154#define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
 155
 156/*
 157 * fixed physical block address (physical block size = 512 byte)
 158 *
 159 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
 160 *       these macros should be removed and the byte offset macros used instead.
 161 */
 162#define SUPER1_B        64      /* primary superblock */
 163#define AIMAP_B         (SUPER1_B + 8)  /* 1st extent of aggregate inode map */
 164#define AITBL_B         (AIMAP_B + 16)  /*
 165                                         * 1st extent of aggregate inode table
 166                                         */
 167#define SUPER2_B        (AITBL_B + 32)  /* 2ndary superblock pbn */
 168#define BMAP_B          (SUPER2_B + 8)  /* block allocation map */
 169
 170/*
 171 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
 172 * superblock.  This is not the same as the superblock structure, since all of
 173 * this space is not currently being used.
 174 */
 175#define SIZE_OF_SUPER   PSIZE
 176
 177/*
 178 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
 179 */
 180#define SIZE_OF_AG_TABLE        PSIZE
 181
 182/*
 183 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
 184 * the inode allocation map (to hold iag)
 185 */
 186#define SIZE_OF_MAP_PAGE        PSIZE
 187
 188/*
 189 * fixed byte offset address
 190 */
 191#define SUPER1_OFF      0x8000  /* primary superblock */
 192#define AIMAP_OFF       (SUPER1_OFF + SIZE_OF_SUPER)
 193                                        /*
 194                                         * Control page of aggregate inode map
 195                                         * followed by 1st extent of map
 196                                         */
 197#define AITBL_OFF       (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
 198                                        /*
 199                                         * 1st extent of aggregate inode table
 200                                         */
 201#define SUPER2_OFF      (AITBL_OFF + INODE_EXTENT_SIZE)
 202                                        /*
 203                                         * secondary superblock
 204                                         */
 205#define BMAP_OFF        (SUPER2_OFF + SIZE_OF_SUPER)
 206                                        /*
 207                                         * block allocation map
 208                                         */
 209
 210/*
 211 * The following macro is used to indicate the number of reserved disk blocks at
 212 * the front of an aggregate, in terms of physical blocks.  This value is
 213 * currently defined to be 32K.  This turns out to be the same as the primary
 214 * superblock's address, since it directly follows the reserved blocks.
 215 */
 216#define AGGR_RSVD_BLOCKS        SUPER1_B
 217
 218/*
 219 * The following macro is used to indicate the number of reserved bytes at the
 220 * front of an aggregate.  This value is currently defined to be 32K.  This
 221 * turns out to be the same as the primary superblock's byte offset, since it
 222 * directly follows the reserved blocks.
 223 */
 224#define AGGR_RSVD_BYTES SUPER1_OFF
 225
 226/*
 227 * The following macro defines the byte offset for the first inode extent in
 228 * the aggregate inode table.  This allows us to find the self inode to find the
 229 * rest of the table.  Currently this value is 44K.
 230 */
 231#define AGGR_INODE_TABLE_START  AITBL_OFF
 232
 233/*
 234 *      fixed reserved inode number
 235 */
 236/* aggregate inode */
 237#define AGGR_RESERVED_I 0       /* aggregate inode (reserved) */
 238#define AGGREGATE_I     1       /* aggregate inode map inode */
 239#define BMAP_I          2       /* aggregate block allocation map inode */
 240#define LOG_I           3       /* aggregate inline log inode */
 241#define BADBLOCK_I      4       /* aggregate bad block inode */
 242#define FILESYSTEM_I    16      /* 1st/only fileset inode in ait:
 243                                 * fileset inode map inode
 244                                 */
 245
 246/* per fileset inode */
 247#define FILESET_RSVD_I  0       /* fileset inode (reserved) */
 248#define FILESET_EXT_I   1       /* fileset inode extension */
 249#define ROOT_I          2       /* fileset root inode */
 250#define ACL_I           3       /* fileset ACL inode */
 251
 252#define FILESET_OBJECT_I 4      /* the first fileset inode available for a file
 253                                 * or directory or link...
 254                                 */
 255#define FIRST_FILESET_INO 16    /* the first aggregate inode which describes
 256                                 * an inode.  (To fsck this is also the first
 257                                 * inode in part 2 of the agg inode table.)
 258                                 */
 259
 260/*
 261 *      directory configuration
 262 */
 263#define JFS_NAME_MAX    255
 264#define JFS_PATH_MAX    BPSIZE
 265
 266
 267/*
 268 *      file system state (superblock state)
 269 */
 270#define FM_CLEAN 0x00000000     /* file system is unmounted and clean */
 271#define FM_MOUNT 0x00000001     /* file system is mounted cleanly */
 272#define FM_DIRTY 0x00000002     /* file system was not unmounted and clean
 273                                 * when mounted or
 274                                 * commit failure occurred while being mounted:
 275                                 * fsck() must be run to repair
 276                                 */
 277#define FM_LOGREDO 0x00000004   /* log based recovery (logredo()) failed:
 278                                 * fsck() must be run to repair
 279                                 */
 280#define FM_EXTENDFS 0x00000008  /* file system extendfs() in progress */
 281
 282#endif                          /* _H_JFS_FILSYS */
 283
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