jfs_superblock.h 4.1 KB

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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_SUPERBLOCK
  19. #define _H_JFS_SUPERBLOCK
  20. /*
  21. * make the magic number something a human could read
  22. */
  23. #define JFS_MAGIC "JFS1" /* Magic word */
  24. #define JFS_VERSION 2 /* Version number: Version 2 */
  25. #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
  26. /*
  27. * aggregate superblock
  28. *
  29. * The name superblock is too close to super_block, so the name has been
  30. * changed to jfs_superblock. The utilities are still using the old name.
  31. */
  32. struct jfs_superblock {
  33. char s_magic[4]; /* 4: magic number */
  34. __le32 s_version; /* 4: version number */
  35. __le64 s_size; /* 8: aggregate size in hardware/LVM blocks;
  36. * VFS: number of blocks
  37. */
  38. __le32 s_bsize; /* 4: aggregate block size in bytes;
  39. * VFS: fragment size
  40. */
  41. __le16 s_l2bsize; /* 2: log2 of s_bsize */
  42. __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
  43. __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */
  44. __le16 s_l2pbsize; /* 2: log2 of s_pbsize */
  45. __le16 pad; /* 2: padding necessary for alignment */
  46. __le32 s_agsize; /* 4: allocation group size in aggr. blocks */
  47. __le32 s_flag; /* 4: aggregate attributes:
  48. * see jfs_filsys.h
  49. */
  50. __le32 s_state; /* 4: mount/unmount/recovery state:
  51. * see jfs_filsys.h
  52. */
  53. __le32 s_compress; /* 4: > 0 if data compression */
  54. pxd_t s_ait2; /* 8: first extent of secondary
  55. * aggregate inode table
  56. */
  57. pxd_t s_aim2; /* 8: first extent of secondary
  58. * aggregate inode map
  59. */
  60. __le32 s_logdev; /* 4: device address of log */
  61. __le32 s_logserial; /* 4: log serial number at aggregate mount */
  62. pxd_t s_logpxd; /* 8: inline log extent */
  63. pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
  64. struct timestruc_t s_time; /* 8: time last updated */
  65. __le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for
  66. * the fsck service log.
  67. * N.B. These blocks are divided among the
  68. * versions kept. This is not a per
  69. * version size.
  70. * N.B. These blocks are included in the
  71. * length field of s_fsckpxd.
  72. */
  73. s8 s_fscklog; /* 1: which fsck service log is most recent
  74. * 0 => no service log data yet
  75. * 1 => the first one
  76. * 2 => the 2nd one
  77. */
  78. char s_fpack[11]; /* 11: file system volume name
  79. * N.B. This must be 11 bytes to
  80. * conform with the OS/2 BootSector
  81. * requirements
  82. * Only used when s_version is 1
  83. */
  84. /* extendfs() parameter under s_state & FM_EXTENDFS */
  85. __le64 s_xsize; /* 8: extendfs s_size */
  86. pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
  87. pxd_t s_xlogpxd; /* 8: extendfs logpxd */
  88. /* - 128 byte boundary - */
  89. char s_uuid[16]; /* 16: 128-bit uuid for volume */
  90. char s_label[16]; /* 16: volume label */
  91. char s_loguuid[16]; /* 16: 128-bit uuid for log device */
  92. };
  93. extern int readSuper(struct super_block *, struct buffer_head **);
  94. extern int updateSuper(struct super_block *, uint);
  95. extern void jfs_error(struct super_block *, const char *, ...);
  96. extern int jfs_mount(struct super_block *);
  97. extern int jfs_mount_rw(struct super_block *, int);
  98. extern int jfs_umount(struct super_block *);
  99. extern int jfs_umount_rw(struct super_block *);
  100. extern int jfs_extendfs(struct super_block *, s64, int);
  101. extern struct task_struct *jfsIOthread;
  102. extern struct task_struct *jfsSyncThread;
  103. #endif /*_H_JFS_SUPERBLOCK */