inode(4)                      UNIX System V(UFS)                       inode(4)


NAME
      inode (ufs) - format of a ufs inode

SYNOPSIS
      #include <sys/param.h>
      #include <sys/types.h>
      #include <sys/vnode.h>
      #include <sys/fs/ufsinode.h>

DESCRIPTION
      The I node is the focus of all local file activity in UNIX.  There is a
      unique inode allocated for each active file, each current directory, each
      mounted-on file, each mapping, and the root.  An inode is `named' by its
      dev/inumber pair.  Data in icommon is read in from permanent inode on the
      actual volume.

      #define EFTMAGIC 0x90909090/* magic cookie for EFT */
      #define NDADDR   12 /* direct addresses in inode */
      #define NIADDR    3 /* indirect addresses in inode */

      struct inode {
           struct   inode *ichain[2];/* must be first */
           struct   vnode ivnode;    /* vnode associated with this inode */
           struct   vnode *idevvp;   /* vnode for block I/O */
           ushort  iflag;
           devt    idev;            /* device where inode resides */
           inot    inumber;         /* i number, 1-to-1 with device address */
           offt    idiroff;         /* offset in dir, where we found last entry */
           struct   fs *ifs;         /* file sys associated with this inode */
           struct   dquot *idquot;   /* quota structure controlling this file */
           short    iowner;          /* proc index of process locking inode */
           short    icount;          /* number of inode locks for iowner */
           short    irwowner;        /* proc index of process holding rwlock */
           daddrt  inextr;          /* next byte read offset (read-ahead) */
           struct inode  *ifreef;    /* free list forward */
           struct inode **ifreeb;    /* free list back */
           ulong    ivcode;          /* version code attribute */
           ulong    imapcnt;         /* mappings to file pages */
           int      *imap;           /* block list for the corresponding file */
           struct   icommon {
               omodet icsmode;/* 0: mode and type of file */
               short    icnlink;/* 2: number of links to file */
               ouidt  icsuid;/* 4: owner's user id */
               ogidt  icsgid;/* 6: owner's group id */
               quad     icsize;      /* 8: number of bytes in file */
      #ifdef KERNEL
               struct timeval icatime;/* 16: time last accessed */
               struct timeval icmtime;/* 24: time last modified */
               struct timeval icctime;/* 32: last time inode changed */
      #else
               timet  icatime;/* 16: time last accessed */
               long    icatspare;


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inode(4)                      UNIX System V(UFS)                       inode(4)


               timet  icmtime;/* 24: time last modified */
               long    icmtspare;
               timet  icctime;/* 32: last time inode changed */
               long    icctspare;
      #endif
               daddrt icdb[NDADDR];/* 40: disk block addresses */
               daddrt icib[NIADDR];/* 88: indirect blocks */
               long    icflags;/* 100: status, currently unused */
               long    icblocks;/* 104: blocks actually held */
               long    icgen;/* 108: generation number */
               modet  icmode;/* 112: EFT version of mode*/
               uidt   icuid;/* 116: EFT version of uid */
               gidt   icgid;/* 120: EFT version of gid */
               ulong   iceftflag;/* 124: indicate EFT version*/

           } iic;
      };

      struct dinode {
           union {
               struct  icommon diicom;
               char    disize[128];
           } diun;
      };

SEE ALSO
      ufs-specific fs(4)



























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