[ Previous | Next | Table of Contents | Index | Library Home | Legal | Search ]

Files Reference


inode.h File

Purpose

Describes a file system file or directory entry as it is listed on a disk.

Syntax

#include <sys/types.h>
#include <sys/ino.h>

Description

The inode file for an ordinary file or directory in a file system has the following structure defined by the sys/ino.h file format:

struct dinode
 {
    /*  generation number  */
    ulong di_gen;
    /*  mode_t returned by stat () */
    /*  format,attributes and permission bits  */
mode_t  di_mode;
  
/* number of links to file(if 0,inode is available)  */
ushort di_nlink;
  
/* accounting ID  */
ushort di_acct;
  
/* user id of owner  */
uid_t di_uid;
  
/* group id of owner  */
gid_t di_gid;
  
/* size of file  */
off_t di_size;
  
/* number of blocks actually used by file  */
ulong di_nblocks;
  
/* time last modified  */
struct timestruc_t di_mtime_ts;
  
/* time last accessed  */
struct timestruc_t di_atime_ts;
  
/* time last changed inode  */
struct timestruc_t di_ctime_ts;
  
/*defines for old time_t names */
#define di_mtime   di_mtime_ts.tv_sec
#define di_atime   di_atime_ts.tv_sec
#define di_ctime   di_ctime_ts.tv_sec
  
/* extended access control information  */
long di_acl;  /* acl pointer  */
#define ACL_INCORE  (1<<31)
ulong di_sec;   /*    reserved    */
  
/*  spares  */
ulong di_rsrvd[5];
  
/***** file type-dependent information ****/
/* size of private data in disk inode is D_PRIVATE.
* location and size of fields depend on object type.
*/
# define D_PRIVATE 48
  
  union di_info
{
    /* all types must fit within d_private  */
    char d_private[D_PRIVATE];
    /* jfs regular file or directory.  */
    struct regdir
    {
         /*privilege vector-only for non-directory  */
         struct
        {
             ulong_di_offset;
             ulong_di_flags;
             define;PCL_ENABLED(1<<31)
             define PCL_EXTENDED(1<<30)
             define PCL_FLAGS\
                   (PCL_ENABLED|PCL_EXTENDED)
        }_di_privingo;
        priv_t_di_priv;
        /* ACL templates - only for directory  */
        struct
        {
             ulong_di_aclf;
             ulong_di_acld;
             {_di_aclingo;
        } _di_sec;
} _di_file;
  
/* offsets of regular file or directory private data.  */
#  define di_rdaddr         _di_info._di_file._di_rdaddr
   define di_vindirect      _di_info._di_file._di_vinderect
   define di_rinderect      _di_info._di_file._di_rinderect
   define di_privinfo       _di_info._di_file._di_sec._di_privinfo
   define di_privoffset     _di_privinfo._di_privoffset
   define di_privflags      _di_privinfo._di_privflags
   define di_priv           _di_info._di_file._di_sec._di_priv
   define di_aclf           _di_info._di_file._di_sec._di_aclinfo._di_aclf
   define di_acld           _di_info._di_file._di_sec._di_aclinfo._di_acld
       /*special file (device)  /*
       struct
       }
          dev_t_di_rdev;
       }_di_dev;
  
/* offsets of special file private data.  */
#    define di_rdev         _di_infor._di_dev._di_rdev
#    define di_bnlastr      _di_info._di_dev._di_bnlastr
#    define di_dgp          _di_info._di_dev._di_dgp
#    define di_pino         _di_info._di_dev._di_pino
  
     /*
      * symbolic link.link is stored inode if its
      * length is less than D_PRIVATE. Otherwise like
      * regular file.
      */
     union
{
         char         _s_private[D_PRIVATE];
         struct       regdir_s_symfile;
         }_di_sym;
  
/* offset of symbolic link private data  */
#  define di_symlink   _di_info._di_sym._s_private
 
 
    /*
     *data for mounted filesystem. kept in inode = 0
     *and dev = devt of mounted filesystem in inode table.
     */
     struct mountnode
 {
     struct inode    *_iplog;    /*itab of log*/
     struct inode    *_ipinode;  /*itab of .inodes*/
     struct inode    *_ipind;    /*itab of .indirect*/
     struct inode    *_ipinomap; /*itab of inode map*/
     struct inode    *_ipdmap;   /*itab of disk map*/
     struct inode    *_ipsuper;  /*itab of super blk*/
     struct inode    *_ipinodex; /*itab of .inodex*/
     struct jfsmount *_jfsmnt;   /* ptr to mount data*/
     ushort           _fperpage; /* frag per block */
     ushort           _agsize;   /* frags per ag */
     ushort           _iagsize;  /* inodes per ag */
 }_mt_info;
  
 /*
  * data for mounted filesystem. kept in inode = 0
  * and dev = devt of mounted filesystem in inode table.
  */
 struct mountnode
 {
     struct inode    *_iplog;    /*itab of log*/
     struct inode    *_ipinode;  /*itab of .inodes*/
     struct inode    *_ipind;    /*itab of .indirect*/
     struct inode    *_ipinomap; /*itab of inode map*/
     struct inode    *_ipdmap;   /*itab of disk map*/
     struct inode    *_ipsuper;  /*itab of super blk*/
     struct inode    *_ipinodex; /*itab of .inodex*/
     struct jfsmount *_jfsmnt;   /* ptr to mount data*/
     ushort           _fperpage; /* frag per block */
     ushort           _agsize;   /* frags per ag */
     ushort           _iagsize;  /* inodes per ag */
     ushort           _compress  /* > 0 if data comp */
 }_mt_info;
  
/* offsets of MOUNT data */
#    define di_iplog    _di_info._mt_info._iplog
#    define di_ipinode  _di_info._mt_info._ipinode
#    define di_ipind    _di_info._mt_info._ipind
#    define di_ipinomap _di_info._mt_info._ipinomap
#    define di_ipdmap   _di_info._mt_info._ipdmap
#    define di_ipsuper  _di_info._mt_info._ipsuper
#    define di_ipinodex _di_info._mt_info._ipinodex
#    define di_jfsmnt   _di_info._mt_info._jfsmnt
#    define di_fperpage _di_info._mt_info._fperpage
#    define di_agsize   _di_info._mt_info._agsize
#    define di_iagsize  _di_info._mt_info._iagsize
  
     /*
      * log info. kept in inode = 0 and dev = devt of
      * log device filesystem in inode table.
      */
     struct lognode
     {
         int _logptr    /* page number end of log */
         int _logsize   /* log size in pages */
         int _logend    /* eor in page _logptr */
         int _logsync   /* addr in last syncpt record */
         int _nextsync  /* bytes to next logsyncpt */
     struct gnode * _logdgp; /* pointer to device gnode */
     }_di_log;
  
/* offsets of MOUNT data */
#  define di_iplog      _di_info._mt_info._iplog
#  define di_ipinode    _di_info._mt_info._ipinode
#  define di_ipind      _di_info._mt_info._ipind
#  define di_ipinomap   _di_info._mt_info._ipinomap
#  define di_ipdmap     _di_info._mt_info._ipdmap
#  define di_ipsuper    _di_info._mt_info._ipsuper
#  define di_ipinodex   _di_info._mt_info._ipinodex
#  define di_jfsmnt     _di_info._mt_info._jfsmnt
#  define di_fperpage   _di_info._mt_info._fperpage
#  define di_agsize     _di_info._mt_info._agsize
#  define di_iagsize    _di_info._mt_info._iagsize
#  define di_compress   _di_info._mt_info._compress
 
    /*
     * log info. kept in inode = 0 and dev = devt of
     * log device filesystem in inode table.
     */
    struct lognode
    {
        int _logptr         /* page number end of log */
        int _logsize        /* log size in pages */
        int _logend         /* eor in page _logptr */
        int _logsync        /* addr in last syncpt record */
        int _nextsync       /* bytes to next logsyncpt */
    struct gnode * _logdgp; /* pointer to device gnode */
 }_di_log;
  
/* offsets of LOG data */
#  define di_logptr  _di_info._di_log._logptr
#  define di_logsize _di_info._di_log._logsize
#  define di_logend  _di_info._di_log._logend
#  define di_logsync _di_info._di_log._logsync
#  define di_nextsync  _di_info._di_log._nextsync
#  define di_logdgp  _di_info._di_log._logdgp
  }_di_info;
};

Implementation Specifics

This file is part of Base Operating System (BOS) Runtime.

Related Information

The filsys.h file, stat.h file, types.h file.

Files Overview.

Directory Overview and File Systems Overview for System Management in AIX 5L Version 5.1 System Management Concepts: Operating System and Devices.


[ Previous | Next | Table of Contents | Index | Library Home | Legal | Search ]