release/src-rt-6.x.4708/linux/linux-2.6.36/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
  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 */