jfs_dinode.h 5.6 KB

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  1. /*
  2. * Copyright (C) International Business Machines Corp., 2000-2001
  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_DINODE
  19. #define _H_JFS_DINODE
  20. /*
  21. * jfs_dinode.h: on-disk inode manager
  22. */
  23. #define INODESLOTSIZE 128
  24. #define L2INODESLOTSIZE 7
  25. #define log2INODESIZE 9 /* log2(bytes per dinode) */
  26. /*
  27. * on-disk inode : 512 bytes
  28. *
  29. * note: align 64-bit fields on 8-byte boundary.
  30. */
  31. struct dinode {
  32. /*
  33. * I. base area (128 bytes)
  34. * ------------------------
  35. *
  36. * define generic/POSIX attributes
  37. */
  38. __le32 di_inostamp; /* 4: stamp to show inode belongs to fileset */
  39. __le32 di_fileset; /* 4: fileset number */
  40. __le32 di_number; /* 4: inode number, aka file serial number */
  41. __le32 di_gen; /* 4: inode generation number */
  42. pxd_t di_ixpxd; /* 8: inode extent descriptor */
  43. __le64 di_size; /* 8: size */
  44. __le64 di_nblocks; /* 8: number of blocks allocated */
  45. __le32 di_nlink; /* 4: number of links to the object */
  46. __le32 di_uid; /* 4: user id of owner */
  47. __le32 di_gid; /* 4: group id of owner */
  48. __le32 di_mode; /* 4: attribute, format and permission */
  49. struct timestruc_t di_atime; /* 8: time last data accessed */
  50. struct timestruc_t di_ctime; /* 8: time last status changed */
  51. struct timestruc_t di_mtime; /* 8: time last data modified */
  52. struct timestruc_t di_otime; /* 8: time created */
  53. dxd_t di_acl; /* 16: acl descriptor */
  54. dxd_t di_ea; /* 16: ea descriptor */
  55. __le32 di_next_index; /* 4: Next available dir_table index */
  56. __le32 di_acltype; /* 4: Type of ACL */
  57. /*
  58. * Extension Areas.
  59. *
  60. * Historically, the inode was partitioned into 4 128-byte areas,
  61. * the last 3 being defined as unions which could have multiple
  62. * uses. The first 96 bytes had been completely unused until
  63. * an index table was added to the directory. It is now more
  64. * useful to describe the last 3/4 of the inode as a single
  65. * union. We would probably be better off redesigning the
  66. * entire structure from scratch, but we don't want to break
  67. * commonality with OS/2's JFS at this time.
  68. */
  69. union {
  70. struct {
  71. /*
  72. * This table contains the information needed to
  73. * find a directory entry from a 32-bit index.
  74. * If the index is small enough, the table is inline,
  75. * otherwise, an x-tree root overlays this table
  76. */
  77. struct dir_table_slot _table[12]; /* 96: inline */
  78. dtroot_t _dtroot; /* 288: dtree root */
  79. } _dir; /* (384) */
  80. #define di_dirtable u._dir._table
  81. #define di_dtroot u._dir._dtroot
  82. #define di_parent di_dtroot.header.idotdot
  83. #define di_DASD di_dtroot.header.DASD
  84. struct {
  85. union {
  86. u8 _data[96]; /* 96: unused */
  87. struct {
  88. void *_imap; /* 4: unused */
  89. __le32 _gengen; /* 4: generator */
  90. } _imap;
  91. } _u1; /* 96: */
  92. #define di_gengen u._file._u1._imap._gengen
  93. union {
  94. xtpage_t _xtroot;
  95. struct {
  96. u8 unused[16]; /* 16: */
  97. dxd_t _dxd; /* 16: */
  98. union {
  99. __le32 _rdev; /* 4: */
  100. u8 _fastsymlink[128];
  101. } _u;
  102. u8 _inlineea[128];
  103. } _special;
  104. } _u2;
  105. } _file;
  106. #define di_xtroot u._file._u2._xtroot
  107. #define di_dxd u._file._u2._special._dxd
  108. #define di_btroot di_xtroot
  109. #define di_inlinedata u._file._u2._special._u
  110. #define di_rdev u._file._u2._special._u._rdev
  111. #define di_fastsymlink u._file._u2._special._u._fastsymlink
  112. #define di_inlineea u._file._u2._special._inlineea
  113. } u;
  114. };
  115. /* extended mode bits (on-disk inode di_mode) */
  116. #define IFJOURNAL 0x00010000 /* journalled file */
  117. #define ISPARSE 0x00020000 /* sparse file enabled */
  118. #define INLINEEA 0x00040000 /* inline EA area free */
  119. #define ISWAPFILE 0x00800000 /* file open for pager swap space */
  120. /* more extended mode bits: attributes for OS/2 */
  121. #define IREADONLY 0x02000000 /* no write access to file */
  122. #define IHIDDEN 0x04000000 /* hidden file */
  123. #define ISYSTEM 0x08000000 /* system file */
  124. #define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */
  125. #define IARCHIVE 0x40000000 /* file archive bit */
  126. #define INEWNAME 0x80000000 /* non-8.3 filename format */
  127. #define IRASH 0x4E000000 /* mask for changeable attributes */
  128. #define ATTRSHIFT 25 /* bits to shift to move attribute
  129. specification to mode position */
  130. /* extended attributes for Linux */
  131. #define JFS_NOATIME_FL 0x00080000 /* do not update atime */
  132. #define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */
  133. #define JFS_SYNC_FL 0x00200000 /* Synchronous updates */
  134. #define JFS_SECRM_FL 0x00400000 /* Secure deletion */
  135. #define JFS_UNRM_FL 0x00800000 /* allow for undelete */
  136. #define JFS_APPEND_FL 0x01000000 /* writes to file may only append */
  137. #define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */
  138. #define JFS_FL_USER_VISIBLE 0x03F80000
  139. #define JFS_FL_USER_MODIFIABLE 0x03F80000
  140. #define JFS_FL_INHERIT 0x03C80000
  141. /* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
  142. #define JFS_IOC_GETFLAGS _IOR('f', 1, long)
  143. #define JFS_IOC_SETFLAGS _IOW('f', 2, long)
  144. #endif /*_H_JFS_DINODE */