fs/jfs/jfs_filsys.h

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