inode(4)                  FILE FORMATS                   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 */



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inode(4)                  FILE FORMATS                   inode(4)



                    long icatspare;
                    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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