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jfs_dinode.h

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _H_JFS_DINODE
#define _H_JFS_DINODE

/*
 *      jfs_dinode.h: on-disk inode manager
 *
 */
#include "jfs_types.h"
#include "jfs_dtree.h"
#include "jfs_xtree.h"

#define INODESLOTSIZE           128
#define L2INODESLOTSIZE         7
#define log2INODESIZE           9   /* log2(bytes per dinode) */


/*
 *      on-disk inode (struct dinode): 512 bytes
 *
 * note: align 64-bit fields on 8-byte boundary.
 */
struct dinode {
      /*
       *      I. base area (128 bytes)
       *      ------------------------
       *
       * define generic/POSIX attributes
       */
      uint32_t  di_inostamp;  /* 4: stamp to show inode belongs to fileset */
      int32_t   di_fileset;   /* 4: fileset number */
      uint32_t  di_number;    /* 4: inode number, aka file serial number */
      uint32_t  di_gen;       /* 4: inode generation number */

      pxd_t     di_ixpxd;           /* 8: inode extent descriptor */

      int64_t   di_size;            /* 8: size */
      int64_t   di_nblocks;   /* 8: number of blocks allocated */

      uint32_t  di_nlink;           /* 4: number of links to the object */

      uint32_t  di_uid;       /* 4: user id of owner */
      uint32_t  di_gid;       /* 4: group id of owner */

      uint32_t  di_mode;            /* 4: attribute, format and permission */

      struct timestruc_t di_atime;  /* 8: time last data accessed */
      struct timestruc_t di_ctime;  /* 8: time last status changed */
      struct timestruc_t di_mtime;  /* 8: time last data modified */
      struct timestruc_t di_otime;  /* 8: time created */

      dxd_t     di_acl;       /* 16: acl descriptor */

      dxd_t     di_ea;        /* 16: ea descriptor */

      int32_t   di_next_index;/* 4: Next available dir_table index */

      int32_t   di_acltype;   /* 4: Type of ACL */

      /*
       *    Extension Areas.
       *
       *    Historically, the inode was partitioned into 4 128-byte areas,
       *    the last 3 being defined as unions which could have multiple
       *    uses.  The first 96 bytes had been completely unused until
       *    an index table was added to the directory.  It is now more
       *    useful to describe the last 3/4 of the inode as a single
       *    union.  We would probably be better off redesigning the
       *    entire structure from scratch, but we don't want to break
       *    commonality with OS/2's JFS at this time.
       */
      union {
            struct {
                  /*
                   * This table contains the information needed to
                   * find a directory entry from a 32-bit index.
                   * If the index is small enough, the table is inline,
                   * otherwise, an x-tree root overlays this table
                   */
                  struct dir_table_slot _table[12];   /* 96: inline */

                  dtroot_t         _dtroot;           /* 288: dtree root */
            } _dir;                                         /* (384) */
#define di_dirtable     u._dir._table
#define di_dtroot u._dir._dtroot
#define di_parent   di_dtroot.header.idotdot
#define di_DASD         di_dtroot.header.DASD

            struct {
                  union {
                        uint8_t  _data[96];           /* 96: unused */
                        struct {
                              void      *_imap; /* 4: unused */
                              uint32_t  _gengen;      /* 4: generator */
                        } _imap;
                  } _u1;                                /* 96: */
#define di_gengen u._file._u1._imap._gengen

                  union {
                        uint8_t  _xtroot[288];
                        struct {
                              uint8_t  unused[16];    /* 16: */
                              dxd_t    _dxd;            /* 16: */
                              union {
                                    uint32_t  _rdev;  /* 4: */
                                    uint8_t   _fastsymlink[128];
                              } _u;
                              uint8_t  _inlineea[128];
                        } _special;
                  } _u2;
            } _file;
#define di_xtroot     u._file._u2._xtroot
#define di_dxd              u._file._u2._special._dxd
#define di_btroot     di_xtroot
#define di_inlinedata   u._file._u2._special._u
#define di_rdev             u._file._u2._special._u._rdev
#define di_fastsymlink  u._file._u2._special._u._fastsymlink
#define di_inlineea     u._file._u2._special._inlineea
      } u;
};

/* di_mode */
/*
 * The utilities that are dealing directly with the disk
 * i-node define the modes as follows. The filesystem itself
 * should use the standard S_IFMT, etc. defines in stat.h
 */
#define IFMT      0xF000            /* S_IFMT - mask of file type */
#define IFDIR     0x4000            /* S_IFDIR - directory */
#define IFREG     0x8000            /* S_IFREG - regular file */
#define IFLNK     0xA000            /* S_IFLNK - symbolic link */
#define IFBLK     0x6000            /* S_IFBLK - block special file */
#define IFCHR     0x2000            /* S_IFCHR - character special file */
#define IFFIFO    0x1000            /* S_IFFIFO - FIFO */
#define IFSOCK    0xC000            /* S_IFSOCK - socket */

#define ISUID     0x0800            /* S_ISUID - set user id when exec'ing */
#define ISGID     0x0400            /* S_ISGID - set group id when exec'ing */

#define IREAD     0x0100            /* S_IRUSR - read permission */
#define IWRITE    0x0080            /* S_IWUSR - write permission */
#define IEXEC     0x0040            /* S_IXUSR - execute permission */

/* extended mode bits (on-disk inode di_mode) */
#define IFJOURNAL   0x00010000      /* journalled file */
#define ISPARSE     0x00020000      /* sparse file enabled */
#define INLINEEA    0x00040000      /* inline EA area free */
#define ISWAPFILE 0x00800000  /* file open for pager swap space */

/* more extended mode bits */
#define IDIRECTORY      0x20000000  /* directory (shadow of real bit) */

#endif /*_H_JFS_DINODE */

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