fs/jfs/jfs_dinode.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *   Copyright (C) International Business Machines Corp., 2000-2001
   4  */
   5 #ifndef _H_JFS_DINODE
   6 #define _H_JFS_DINODE
   7
   8 /*
   9  *      jfs_dinode.h: on-disk inode manager
  10  */
  11
  12 #define INODESLOTSIZE           128
  13 #define L2INODESLOTSIZE         7
  14 #define log2INODESIZE           9       /* log2(bytes per dinode) */
  15
  16
  17 /*
  18  *      on-disk inode : 512 bytes
  19  *
  20  * note: align 64-bit fields on 8-byte boundary.
  21  */
  22 struct dinode {
  23         /*
  24          *      I. base area (128 bytes)
  25          *      ------------------------
  26          *
  27          * define generic/POSIX attributes
  28          */
  29         __le32 di_inostamp;     /* 4: stamp to show inode belongs to fileset */
  30         __le32 di_fileset;      /* 4: fileset number */
  31         __le32 di_number;       /* 4: inode number, aka file serial number */
  32         __le32 di_gen;          /* 4: inode generation number */
  33
  34         pxd_t di_ixpxd;         /* 8: inode extent descriptor */
  35
  36         __le64 di_size;         /* 8: size */
  37         __le64 di_nblocks;      /* 8: number of blocks allocated */
  38
  39         __le32 di_nlink;        /* 4: number of links to the object */
  40
  41         __le32 di_uid;          /* 4: user id of owner */
  42         __le32 di_gid;          /* 4: group id of owner */
  43
  44         __le32 di_mode;         /* 4: attribute, format and permission */
  45
  46         struct timestruc_t di_atime;    /* 8: time last data accessed */
  47         struct timestruc_t di_ctime;    /* 8: time last status changed */
  48         struct timestruc_t di_mtime;    /* 8: time last data modified */
  49         struct timestruc_t di_otime;    /* 8: time created */
  50
  51         dxd_t di_acl;           /* 16: acl descriptor */
  52
  53         dxd_t di_ea;            /* 16: ea descriptor */
  54
  55         __le32 di_next_index;   /* 4: Next available dir_table index */
  56
  57         __le32 di_acltype;      /* 4: Type of ACL */
  58
  59         /*
  60          *      Extension Areas.
  61          *
  62          *      Historically, the inode was partitioned into 4 128-byte areas,
  63          *      the last 3 being defined as unions which could have multiple
  64          *      uses.  The first 96 bytes had been completely unused until
  65          *      an index table was added to the directory.  It is now more
  66          *      useful to describe the last 3/4 of the inode as a single
  67          *      union.  We would probably be better off redesigning the
  68          *      entire structure from scratch, but we don't want to break
  69          *      commonality with OS/2's JFS at this time.
  70          */
  71         union {
  72                 struct {
  73                         /*
  74                          * This table contains the information needed to
  75                          * find a directory entry from a 32-bit index.
  76                          * If the index is small enough, the table is inline,
  77                          * otherwise, an x-tree root overlays this table
  78                          */
  79                         struct dir_table_slot _table[12]; /* 96: inline */
  80
  81                         dtroot_t _dtroot;               /* 288: dtree root */
  82                 } _dir;                                 /* (384) */
  83 #define di_dirtable     u._dir._table
  84 #define di_dtroot       u._dir._dtroot
  85 #define di_parent       di_dtroot.header.idotdot
  86 #define di_DASD         di_dtroot.header.DASD
  87
  88                 struct {
  89                         union {
  90                                 u8 _data[96];           /* 96: unused */
  91                                 struct {
  92                                         void *_imap;    /* 4: unused */
  93                                         __le32 _gengen; /* 4: generator */
  94                                 } _imap;
  95                         } _u1;                          /* 96: */
  96 #define di_gengen       u._file._u1._imap._gengen
  97
  98                         union {
  99                                 xtroot_t _xtroot;
 100                                 struct {
 101                                         u8 unused[16];  /* 16: */
 102                                         dxd_t _dxd;     /* 16: */
 103                                         union {
 104                                                 /*
 105                                                  * The fast symlink area
 106                                                  * is expected to overflow
 107                                                  * into _inlineea when
 108                                                  * needed (which will clear
 109                                                  * INLINEEA).
 110                                                  */
 111                                                 struct {
 112                                                         union {
 113                                                                 __le32 _rdev;   /* 4: */
 114                                                                 u8 _fastsymlink[128];
 115                                                         } _u;
 116                                                         u8 _inlineea[128];
 117                                                 };
 118                                                 u8 _inline_all[256];
 119                                         };
 120                                 } _special;
 121                         } _u2;
 122                 } _file;
 123 #define di_xtroot       u._file._u2._xtroot
 124 #define di_dxd          u._file._u2._special._dxd
 125 #define di_btroot       di_xtroot
 126 #define di_inlinedata   u._file._u2._special._u
 127 #define di_rdev         u._file._u2._special._u._rdev
 128 #define di_fastsymlink  u._file._u2._special._u._fastsymlink
 129 #define di_inlineea     u._file._u2._special._inlineea
 130 #define di_inline_all   u._file._u2._special._inline_all
 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 IHIDDEN         0x04000000      /* hidden file */
 143 #define ISYSTEM         0x08000000      /* system file */
 144
 145 #define IDIRECTORY      0x20000000      /* directory (shadow of real bit) */
 146 #define IARCHIVE        0x40000000      /* file archive bit */
 147 #define INEWNAME        0x80000000      /* non-8.3 filename format */
 148
 149 #define IRASH           0x4E000000      /* mask for changeable attributes */
 150 #define ATTRSHIFT       25      /* bits to shift to move attribute
 151                                    specification to mode position */
 152
 153 /* extended attributes for Linux */
 154
 155 #define JFS_NOATIME_FL          0x00080000 /* do not update atime */
 156
 157 #define JFS_DIRSYNC_FL          0x00100000 /* dirsync behaviour */
 158 #define JFS_SYNC_FL             0x00200000 /* Synchronous updates */
 159 #define JFS_SECRM_FL            0x00400000 /* Secure deletion */
 160 #define JFS_UNRM_FL             0x00800000 /* allow for undelete */
 161
 162 #define JFS_APPEND_FL           0x01000000 /* writes to file may only append */
 163 #define JFS_IMMUTABLE_FL        0x02000000 /* Immutable file */
 164
 165 #define JFS_FL_USER_VISIBLE     0x03F80000
 166 #define JFS_FL_USER_MODIFIABLE  0x03F80000
 167 #define JFS_FL_INHERIT          0x03C80000
 168
 169 #endif /*_H_JFS_DINODE */