_DIR_ => _DIR_H

[unix-history] / usr / src / sys / ufs / ffs / inode.h

/*
* Copyright (c) 1982, 1989 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)inode.h     7.15 (Berkeley) %G%
*/

#ifdef KERNEL
#include "../ufs/dinode.h"
#else
#include <ufs/dinode.h>
#endif

/*
* The I node is the focus of all file activity in UNIX.
* There is a unique inode allocated for each active file,
* each current directory, each mounted-on file, text file, and the root.
* An inode is 'named' by its dev/inumber pair. (iget/iget.c)
* Data in `struct dinode' is read in from permanent inode on volume.
*/

struct inode {
       struct  inode *i_chain[2]; /* hash chain, MUST be first */
       struct  vnode *i_vnode; /* vnode associated with this inode */
       struct  vnode *i_devvp; /* vnode for block I/O */
       u_long  i_flag;         /* see below */
       dev_t   i_dev;          /* device where inode resides */
       ino_t   i_number;       /* i number, 1-to-1 with device address */
       struct  fs *i_fs;       /* file sys associated with this inode */
       struct  dquot *i_dquot[MAXQUOTAS]; /* pointer to dquot structures */
       struct  lockf *i_lockf; /* Head of byte-level lock list */
       long    i_diroff;       /* offset in dir, where we found last entry */
       off_t   i_endoff;       /* end of useful stuff in directory */
       long    i_spare0;
       long    i_spare1;
       struct  dinode i_din;   /* the on-disk inode */
};

#define i_mode          i_din.di_mode
#define i_nlink         i_din.di_nlink
#define i_uid           i_din.di_uid
#define i_gid           i_din.di_gid
#if BYTE_ORDER == LITTLE_ENDIAN || defined(tahoe) /* ugh! -- must be fixed */
#define i_size          i_din.di_qsize.val[0]
#else /* BYTE_ORDER == BIG_ENDIAN */
#define i_size          i_din.di_qsize.val[1]
#endif
#define i_db            i_din.di_db
#define i_ib            i_din.di_ib
#define i_atime         i_din.di_atime
#define i_mtime         i_din.di_mtime
#define i_ctime         i_din.di_ctime
#define i_blocks        i_din.di_blocks
#define i_rdev          i_din.di_db[0]
#define i_flags         i_din.di_flags
#define i_gen           i_din.di_gen
#define i_forw          i_chain[0]
#define i_back          i_chain[1]

/* flags */
#define ILOCKED         0x0001          /* inode is locked */
#define IWANT           0x0002          /* some process waiting on lock */
#define IRENAME         0x0004          /* inode is being renamed */
#define IUPD            0x0010          /* file has been modified */
#define IACC            0x0020          /* inode access time to be updated */
#define ICHG            0x0040          /* inode has been changed */
#define IMOD            0x0080          /* inode has been modified */
#define ISHLOCK         0x0100          /* file has shared lock */
#define IEXLOCK         0x0200          /* file has exclusive lock */
#define ILWAIT          0x0400          /* someone waiting on file lock */

#ifdef KERNEL
/*
* Convert between inode pointers and vnode pointers
*/
#define VTOI(vp)        ((struct inode *)(vp)->v_data)
#define ITOV(ip)        ((ip)->i_vnode)

/*
* Convert between vnode types and inode formats
*/
extern enum vtype       iftovt_tab[];
extern int              vttoif_tab[];
#define IFTOVT(mode)    (iftovt_tab[((mode) & IFMT) >> 12])
#define VTTOIF(indx)    (vttoif_tab[(int)(indx)])

#define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))

u_long  nextgennumber;          /* next generation number to assign */

extern ino_t    dirpref();

/*
* Lock and unlock inodes.
*/
#ifdef notdef
#define ILOCK(ip) { \
       while ((ip)->i_flag & ILOCKED) { \
               (ip)->i_flag |= IWANT; \
               (void) sleep((caddr_t)(ip), PINOD); \
       } \
       (ip)->i_flag |= ILOCKED; \
}

#define IUNLOCK(ip) { \
       (ip)->i_flag &= ~ILOCKED; \
       if ((ip)->i_flag&IWANT) { \
               (ip)->i_flag &= ~IWANT; \
               wakeup((caddr_t)(ip)); \
       } \
}
#else
#define ILOCK(ip)       ilock(ip)
#define IUNLOCK(ip)     iunlock(ip)
#endif

#define IUPDAT(ip, t1, t2, waitfor) { \
       if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
               (void) iupdat(ip, t1, t2, waitfor); \
}

#define ITIMES(ip, t1, t2) { \
       if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
               (ip)->i_flag |= IMOD; \
               if ((ip)->i_flag&IACC) \
                       (ip)->i_atime = (t1)->tv_sec; \
               if ((ip)->i_flag&IUPD) \
                       (ip)->i_mtime = (t2)->tv_sec; \
               if ((ip)->i_flag&ICHG) \
                       (ip)->i_ctime = time.tv_sec; \
               (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
       } \
}

/*
* This overlays the fid sturcture (see mount.h)
*/
struct ufid {
       u_short ufid_len;       /* length of structure */
       u_short ufid_pad;       /* force long alignment */
       ino_t   ufid_ino;       /* file number (ino) */
       long    ufid_gen;       /* generation number */
};
#endif