fs/jfs/jfs_dinode.h

   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 /*
  22  *      jfs_dinode.h: on-disk inode manager
  23  */
  24
  25 #define INODESLOTSIZE           128
  26 #define L2INODESLOTSIZE         7
  27 #define log2INODESIZE           9       /* log2(bytes per dinode) */
  28
  29
  30 /*
  31  *      on-disk inode : 512 bytes
  32  *
  33  * note: align 64-bit fields on 8-byte boundary.
  34  */
  35 struct dinode {
  36         /*
  37          *      I. base area (128 bytes)
  38          *      ------------------------
  39          *
  40          * define generic/POSIX attributes
  41          */
  42         u32 di_inostamp;        /* 4: stamp to show inode belongs to fileset */
  43         s32 di_fileset;         /* 4: fileset number */
  44         u32 di_number;          /* 4: inode number, aka file serial number */
  45         u32 di_gen;             /* 4: inode generation number */
  46
  47         pxd_t di_ixpxd;         /* 8: inode extent descriptor */
  48
  49         s64 di_size;            /* 8: size */
  50         s64 di_nblocks;         /* 8: number of blocks allocated */
  51
  52         u32 di_nlink;           /* 4: number of links to the object */
  53
  54         u32 di_uid;             /* 4: user id of owner */
  55         u32 di_gid;             /* 4: group id of owner */
  56
  57         u32 di_mode;            /* 4: attribute, format and permission */
  58
  59         struct timestruc_t di_atime;    /* 8: time last data accessed */
  60         struct timestruc_t di_ctime;    /* 8: time last status changed */
  61         struct timestruc_t di_mtime;    /* 8: time last data modified */
  62         struct timestruc_t di_otime;    /* 8: time created */
  63
  64         dxd_t di_acl;           /* 16: acl descriptor */
  65
  66         dxd_t di_ea;            /* 16: ea descriptor */
  67
  68         u32 di_next_index;      /* 4: Next available dir_table index */
  69
  70         s32 di_acltype;         /* 4: Type of ACL */
  71
  72         /*
  73          *      Extension Areas.
  74          *
  75          *      Historically, the inode was partitioned into 4 128-byte areas,
  76          *      the last 3 being defined as unions which could have multiple
  77          *      uses.  The first 96 bytes had been completely unused until
  78          *      an index table was added to the directory.  It is now more
  79          *      useful to describe the last 3/4 of the inode as a single
  80          *      union.  We would probably be better off redesigning the
  81          *      entire structure from scratch, but we don't want to break
  82          *      commonality with OS/2's JFS at this time.
  83          */
  84         union {
  85                 struct {
  86                         /*
  87                          * This table contains the information needed to
  88                          * find a directory entry from a 32-bit index.
  89                          * If the index is small enough, the table is inline,
  90                          * otherwise, an x-tree root overlays this table
  91                          */
  92                         struct dir_table_slot _table[12]; /* 96: inline */
  93
  94                         dtroot_t _dtroot;               /* 288: dtree root */
  95                 } _dir;                                 /* (384) */
  96 #define di_dirtable     u._dir._table
  97 #define di_dtroot       u._dir._dtroot
  98 #define di_parent       di_dtroot.header.idotdot
  99 #define di_DASD         di_dtroot.header.DASD
 100
 101                 struct {
 102                         union {
 103                                 u8 _data[96];           /* 96: unused */
 104                                 struct {
 105                                         void *_imap;    /* 4: unused */
 106                                         u32 _gengen;    /* 4: generator */
 107                                 } _imap;
 108                         } _u1;                          /* 96: */
 109 #define di_gengen       u._file._u1._imap._gengen
 110
 111                         union {
 112                                 xtpage_t _xtroot;
 113                                 struct {
 114                                         u8 unused[16];  /* 16: */
 115                                         dxd_t _dxd;     /* 16: */
 116                                         union {
 117                                                 u32 _rdev;      /* 4: */
 118                                                 u8 _fastsymlink[128];
 119                                         } _u;
 120                                         u8 _inlineea[128];
 121                                 } _special;
 122                         } _u2;
 123                 } _file;
 124 #define di_xtroot       u._file._u2._xtroot
 125 #define di_dxd          u._file._u2._special._dxd
 126 #define di_btroot       di_xtroot
 127 #define di_inlinedata   u._file._u2._special._u
 128 #define di_rdev         u._file._u2._special._u._rdev
 129 #define di_fastsymlink  u._file._u2._special._u._fastsymlink
 130 #define di_inlineea     u._file._u2._special._inlineea
 131         } u;
 132 };
 133
 134 /* extended mode bits (on-disk inode di_mode) */
 135 #define IFJOURNAL       0x00010000      /* journalled file */
 136 #define ISPARSE         0x00020000      /* sparse file enabled */
 137 #define INLINEEA        0x00040000      /* inline EA area free */
 138 #define ISWAPFILE       0x00800000      /* file open for pager swap space */
 139
 140 /* more extended mode bits: attributes for OS/2 */
 141 #define IREADONLY       0x02000000      /* no write access to file */
 142 #define IARCHIVE        0x40000000      /* file archive bit */
 143 #define ISYSTEM         0x08000000      /* system file */
 144 #define IHIDDEN         0x04000000      /* hidden file */
 145 #define IRASH           0x4E000000      /* mask for changeable attributes */
 146 #define INEWNAME        0x80000000      /* non-8.3 filename format */
 147 #define IDIRECTORY      0x20000000      /* directory (shadow of real bit) */
 148 #define ATTRSHIFT       25      /* bits to shift to move attribute
 149                                    specification to mode position */
 150
 151 #endif /*_H_JFS_DINODE */