fs/jfs/jfs_filsys.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *   Copyright (C) International Business Machines Corp., 2000-2003
   4  */
   5 #ifndef _H_JFS_FILSYS
   6 #define _H_JFS_FILSYS
   7
   8 /*
   9  *      jfs_filsys.h
  10  *
  11  * file system (implementation-dependent) constants
  12  *
  13  * refer to <limits.h> for system wide implementation-dependent constants
  14  */
  15
  16 /*
  17  *       file system option (superblock flag)
  18  */
  19
  20 /* directory option */
  21 #define JFS_UNICODE     0x00000001      /* unicode name */
  22
  23 /* mount time flags for error handling */
  24 #define JFS_ERR_REMOUNT_RO 0x00000002   /* remount read-only */
  25 #define JFS_ERR_CONTINUE   0x00000004   /* continue */
  26 #define JFS_ERR_PANIC      0x00000008   /* panic */
  27
  28 /* Quota support */
  29 #define JFS_USRQUOTA    0x00000010
  30 #define JFS_GRPQUOTA    0x00000020
  31
  32 /* mount time flag to disable journaling to disk */
  33 #define JFS_NOINTEGRITY 0x00000040
  34
  35 /* mount time flag to enable TRIM to ssd disks */
  36 #define JFS_DISCARD     0x00000080
  37
  38 /* commit option */
  39 #define JFS_COMMIT      0x00000f00      /* commit option mask */
  40 #define JFS_GROUPCOMMIT 0x00000100      /* group (of 1) commit */
  41 #define JFS_LAZYCOMMIT  0x00000200      /* lazy commit */
  42 #define JFS_TMPFS       0x00000400      /* temporary file system -
  43                                          * do not log/commit:
  44                                          * Never implemented
  45                                          */
  46
  47 /* log logical volume option */
  48 #define JFS_INLINELOG   0x00000800      /* inline log within file system */
  49 #define JFS_INLINEMOVE  0x00001000      /* inline log being moved */
  50
  51 /* Secondary aggregate inode table */
  52 #define JFS_BAD_SAIT    0x00010000      /* current secondary ait is bad */
  53
  54 /* sparse regular file support */
  55 #define JFS_SPARSE      0x00020000      /* sparse regular file */
  56
  57 /* DASD Limits          F226941 */
  58 #define JFS_DASD_ENABLED 0x00040000     /* DASD limits enabled */
  59 #define JFS_DASD_PRIME  0x00080000      /* Prime DASD usage on boot */
  60
  61 /* big endian flag */
  62 #define JFS_SWAP_BYTES  0x00100000      /* running on big endian computer */
  63
  64 /* Directory index */
  65 #define JFS_DIR_INDEX   0x00200000      /* Persistent index for */
  66
  67 /* platform options */
  68 #define JFS_LINUX       0x10000000      /* Linux support */
  69 #define JFS_DFS         0x20000000      /* DCE DFS LFS support */
  70 /*      Never implemented */
  71
  72 #define JFS_OS2         0x40000000      /* OS/2 support */
  73 /*      case-insensitive name/directory support */
  74
  75 #define JFS_AIX         0x80000000      /* AIX support */
  76
  77 /*
  78  *      buffer cache configuration
  79  */
  80 /* page size */
  81 #ifdef PSIZE
  82 #undef PSIZE
  83 #endif
  84 #define PSIZE           4096    /* page size (in byte) */
  85 #define L2PSIZE         12      /* log2(PSIZE) */
  86 #define POFFSET         4095    /* offset within page */
  87
  88 /* buffer page size */
  89 #define BPSIZE  PSIZE
  90
  91 /*
  92  *      fs fundamental size
  93  *
  94  * PSIZE >= file system block size >= PBSIZE >= DISIZE
  95  */
  96 #define PBSIZE          512     /* physical block size (in byte) */
  97 #define L2PBSIZE        9       /* log2(PBSIZE) */
  98
  99 #define DISIZE          512     /* on-disk inode size (in byte) */
 100 #define L2DISIZE        9       /* log2(DISIZE) */
 101
 102 #define IDATASIZE       256     /* inode inline data size */
 103 #define IXATTRSIZE      128     /* inode inline extended attribute size */
 104
 105 #define XTPAGE_SIZE     4096
 106 #define log2_PAGESIZE   12
 107
 108 #define IAG_SIZE        4096
 109 #define IAG_EXTENT_SIZE 4096
 110 #define INOSPERIAG      4096    /* number of disk inodes per iag */
 111 #define L2INOSPERIAG    12      /* l2 number of disk inodes per iag */
 112 #define INOSPEREXT      32      /* number of disk inode per extent */
 113 #define L2INOSPEREXT    5       /* l2 number of disk inode per extent */
 114 #define IXSIZE          (DISIZE * INOSPEREXT)   /* inode extent size */
 115 #define INOSPERPAGE     8       /* number of disk inodes per 4K page */
 116 #define L2INOSPERPAGE   3       /* log2(INOSPERPAGE) */
 117
 118 #define IAGFREELIST_LWM 64
 119
 120 #define INODE_EXTENT_SIZE       IXSIZE  /* inode extent size */
 121 #define NUM_INODE_PER_EXTENT    INOSPEREXT
 122 #define NUM_INODE_PER_IAG       INOSPERIAG
 123
 124 #define MINBLOCKSIZE            512
 125 #define MAXBLOCKSIZE            4096
 126 #define MAXFILESIZE             ((s64)1 << 52)
 127
 128 #define JFS_LINK_MAX            0xffffffff
 129
 130 /* Minimum number of bytes supported for a JFS partition */
 131 #define MINJFS                  (0x1000000)
 132 #define MINJFSTEXT              "16"
 133
 134 /*
 135  * file system block size -> physical block size
 136  */
 137 #define LBOFFSET(x)     ((x) & (PBSIZE - 1))
 138 #define LBNUMBER(x)     ((x) >> L2PBSIZE)
 139 #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
 140 #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
 141 /* size in byte -> last page number */
 142 #define SIZE2PN(size)   ( ((s64)((size) - 1)) >> (L2PSIZE) )
 143 /* size in byte -> last file system block number */
 144 #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
 145
 146 /*
 147  * fixed physical block address (physical block size = 512 byte)
 148  *
 149  * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
 150  *       these macros should be removed and the byte offset macros used instead.
 151  */
 152 #define SUPER1_B        64      /* primary superblock */
 153 #define AIMAP_B         (SUPER1_B + 8)  /* 1st extent of aggregate inode map */
 154 #define AITBL_B         (AIMAP_B + 16)  /*
 155                                          * 1st extent of aggregate inode table
 156                                          */
 157 #define SUPER2_B        (AITBL_B + 32)  /* 2ndary superblock pbn */
 158 #define BMAP_B          (SUPER2_B + 8)  /* block allocation map */
 159
 160 /*
 161  * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
 162  * superblock.  This is not the same as the superblock structure, since all of
 163  * this space is not currently being used.
 164  */
 165 #define SIZE_OF_SUPER   PSIZE
 166
 167 /*
 168  * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
 169  */
 170 #define SIZE_OF_AG_TABLE        PSIZE
 171
 172 /*
 173  * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
 174  * the inode allocation map (to hold iag)
 175  */
 176 #define SIZE_OF_MAP_PAGE        PSIZE
 177
 178 /*
 179  * fixed byte offset address
 180  */
 181 #define SUPER1_OFF      0x8000  /* primary superblock */
 182 #define AIMAP_OFF       (SUPER1_OFF + SIZE_OF_SUPER)
 183                                         /*
 184                                          * Control page of aggregate inode map
 185                                          * followed by 1st extent of map
 186                                          */
 187 #define AITBL_OFF       (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
 188                                         /*
 189                                          * 1st extent of aggregate inode table
 190                                          */
 191 #define SUPER2_OFF      (AITBL_OFF + INODE_EXTENT_SIZE)
 192                                         /*
 193                                          * secondary superblock
 194                                          */
 195 #define BMAP_OFF        (SUPER2_OFF + SIZE_OF_SUPER)
 196                                         /*
 197                                          * block allocation map
 198                                          */
 199
 200 /*
 201  * The following macro is used to indicate the number of reserved disk blocks at
 202  * the front of an aggregate, in terms of physical blocks.  This value is
 203  * currently defined to be 32K.  This turns out to be the same as the primary
 204  * superblock's address, since it directly follows the reserved blocks.
 205  */
 206 #define AGGR_RSVD_BLOCKS        SUPER1_B
 207
 208 /*
 209  * The following macro is used to indicate the number of reserved bytes at the
 210  * front of an aggregate.  This value is currently defined to be 32K.  This
 211  * turns out to be the same as the primary superblock's byte offset, since it
 212  * directly follows the reserved blocks.
 213  */
 214 #define AGGR_RSVD_BYTES SUPER1_OFF
 215
 216 /*
 217  * The following macro defines the byte offset for the first inode extent in
 218  * the aggregate inode table.  This allows us to find the self inode to find the
 219  * rest of the table.  Currently this value is 44K.
 220  */
 221 #define AGGR_INODE_TABLE_START  AITBL_OFF
 222
 223 /*
 224  *      fixed reserved inode number
 225  */
 226 /* aggregate inode */
 227 #define AGGR_RESERVED_I 0       /* aggregate inode (reserved) */
 228 #define AGGREGATE_I     1       /* aggregate inode map inode */
 229 #define BMAP_I          2       /* aggregate block allocation map inode */
 230 #define LOG_I           3       /* aggregate inline log inode */
 231 #define BADBLOCK_I      4       /* aggregate bad block inode */
 232 #define FILESYSTEM_I    16      /* 1st/only fileset inode in ait:
 233                                  * fileset inode map inode
 234                                  */
 235
 236 /* per fileset inode */
 237 #define FILESET_RSVD_I  0       /* fileset inode (reserved) */
 238 #define FILESET_EXT_I   1       /* fileset inode extension */
 239 #define ROOT_I          2       /* fileset root inode */
 240 #define ACL_I           3       /* fileset ACL inode */
 241
 242 #define FILESET_OBJECT_I 4      /* the first fileset inode available for a file
 243                                  * or directory or link...
 244                                  */
 245 #define FIRST_FILESET_INO 16    /* the first aggregate inode which describes
 246                                  * an inode.  (To fsck this is also the first
 247                                  * inode in part 2 of the agg inode table.)
 248                                  */
 249
 250 /*
 251  *      directory configuration
 252  */
 253 #define JFS_NAME_MAX    255
 254 #define JFS_PATH_MAX    BPSIZE
 255
 256
 257 /*
 258  *      file system state (superblock state)
 259  */
 260 #define FM_CLEAN 0x00000000     /* file system is unmounted and clean */
 261 #define FM_MOUNT 0x00000001     /* file system is mounted cleanly */
 262 #define FM_DIRTY 0x00000002     /* file system was not unmounted and clean
 263                                  * when mounted or
 264                                  * commit failure occurred while being mounted:
 265                                  * fsck() must be run to repair
 266                                  */
 267 #define FM_LOGREDO 0x00000004   /* log based recovery (logredo()) failed:
 268                                  * fsck() must be run to repair
 269                                  */
 270 #define FM_EXTENDFS 0x00000008  /* file system extendfs() in progress */
 271
 272 #endif                          /* _H_JFS_FILSYS */