inode(4-ufs)                                                   inode(4-ufs)

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 inode is the focus of all local file activity in Reliant 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 */








Page 1                       Reliant UNIX 5.44                Printed 11/98

inode(4-ufs)                                                   inode(4-ufs)

     #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;
             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
     fs(4-ufs).


















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