NAME

inode (ufs) − format of a ufs inode

SYNOPSIS

#include <sys/param.h>
#include <sys/types.h>
#include <sys/vnode.h>
#include <sys/fs/ufs_inode.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 EFT_MAGIC 0x90909090 /∗ magic cookie for EFT ∗/
#define NDADDR   12/∗ direct addresses in inode ∗/
#define NIADDR    3/∗ indirect addresses in inode ∗/
 struct inode {
     struct   inode ∗i_chain[2];/∗ must be first ∗/
     struct   vnode i_vnode;    /∗ vnode associated with this inode ∗/
     struct   vnode ∗i_devvp;   /∗ vnode for block I/O ∗/
     u_short  i_flag;
     dev_t    i_dev;            /∗ device where inode resides ∗/
     ino_t    i_number;         /∗ i number, 1-to-1 with device address ∗/
     off_t    i_diroff;         /∗ offset in dir, where we found last entry ∗/
     struct   fs ∗i_fs;         /∗ file sys associated with this inode ∗/
     struct   dquot ∗i_dquot;   /∗ quota structure controlling this file ∗/
     short    i_owner;          /∗ proc index of process locking inode ∗/
     short    i_count;          /∗ number of inode locks for i_owner ∗/
     short    i_rwowner;        /∗ proc index of process holding rwlock ∗/
     daddr_t  i_nextr;          /∗ next byte read offset (read-ahead) ∗/
     struct inode  ∗i_freef;    /∗ free list forward ∗/
     struct inode ∗∗i_freeb;    /∗ free list back ∗/
     ulong    i_vcode;          /∗ version code attribute ∗/
     ulong    i_mapcnt;         /∗ mappings to file pages ∗/
     int      ∗i_map;           /∗ block list for the corresponding file ∗/
     struct   icommon {
         o_mode_t ic_smode;/∗ 0: mode and type of file ∗/
         short    ic_nlink;/∗ 2: number of links to file ∗/
         o_uid_t  ic_suid;/∗ 4: owner’s user id ∗/
         o_gid_t  ic_sgid;/∗ 6: owner’s group id ∗/
         quad     ic_size;      /∗ 8: number of bytes in file ∗/
#ifdef _KERNEL
         struct timeval ic_atime; /∗ 16: time last accessed ∗/
         struct timeval ic_mtime; /∗ 24: time last modified ∗/
         struct timeval ic_ctime; /∗ 32: last time inode changed ∗/
#else
         time_t  ic_atime;/∗ 16: time last accessed ∗/
         long    ic_atspare;
         time_t  ic_mtime;/∗ 24: time last modified ∗/
         long    ic_mtspare;
         time_t  ic_ctime;/∗ 32: last time inode changed ∗/
         long    ic_ctspare;
#endif
         daddr_t ic_db[NDADDR]; /∗ 40: disk block addresses ∗/
         daddr_t ic_ib[NIADDR]; /∗ 88: indirect blocks ∗/
         long    ic_flags;/∗ 100: status, currently unused ∗/
         long    ic_blocks;/∗ 104: blocks actually held ∗/
         long    ic_gen;/∗ 108: generation number ∗/
         mode_t  ic_mode;/∗ 112: EFT version of mode∗/
         uid_t   ic_uid;/∗ 116: EFT version of uid ∗/
         gid_t   ic_gid;/∗ 120: EFT version of gid ∗/
         ulong   ic_eftflag;/∗ 124: indicate EFT version∗/
      } i_ic;
};
 struct dinode {
     union {
         struct  icommon di_icom;
         char    di_size[128];
     } di_un;
};

SEE ALSO

ufs-specific fs(4)

  —  UFS