linux/fs/jfs/jfs_dinode.h
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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/*
  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 */
  35struct dinode {
  36        /*
  37         *      I. base area (128 bytes)
  38         *      ------------------------
  39         *
  40         * define generic/POSIX attributes
  41         */
  42        __le32 di_inostamp;     /* 4: stamp to show inode belongs to fileset */
  43        __le32 di_fileset;      /* 4: fileset number */
  44        __le32 di_number;       /* 4: inode number, aka file serial number */
  45        __le32 di_gen;          /* 4: inode generation number */
  46
  47        pxd_t di_ixpxd;         /* 8: inode extent descriptor */
  48
  49        __le64 di_size;         /* 8: size */
  50        __le64 di_nblocks;      /* 8: number of blocks allocated */
  51
  52        __le32 di_nlink;        /* 4: number of links to the object */
  53
  54        __le32 di_uid;          /* 4: user id of owner */
  55        __le32 di_gid;          /* 4: group id of owner */
  56
  57        __le32 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        __le32 di_next_index;   /* 4: Next available dir_table index */
  69
  70        __le32 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                                        __le32 _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                                                __le32 _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 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/* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
 170#define JFS_IOC_GETFLAGS        _IOR('f', 1, long)
 171#define JFS_IOC_SETFLAGS        _IOW('f', 2, long)
 172
 173#define JFS_IOC_GETFLAGS32      _IOR('f', 1, int)
 174#define JFS_IOC_SETFLAGS32      _IOW('f', 2, int)
 175
 176#endif /*_H_JFS_DINODE */
 177
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