only delete space used by inode, on inode deletion; required

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

/*
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Scooter Morris at Genentech Inc.
*
* %sccs.include.redist.c%
*
*      @(#)lockf.h     7.2 (Berkeley) %G%
*/

/*
* The lockf structure is a kernel structure which contains the information
* associated with a byte range lock.  The lockf structures are linked into
* the inode structure. Locks are sorted by the starting byte of the lock for
* efficiency.
*/
struct lockf {
       short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
       short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
       off_t   lf_start;        /* The byte # of the start of the lock */
       off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
       caddr_t lf_id;           /* The id of the resource holding the lock */
       struct  inode *lf_inode; /* Back pointer to the inode */
       struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
       struct  lockf *lf_block; /* The list of blocked locks */
};

/* Maximum length of sleep chains to traverse to try and detect deadlock. */
#define MAXDEPTH 50

__BEGIN_DECLS
void     lf_addblock __P((struct lockf *, struct lockf *));
int      lf_clearlock __P((struct lockf *));
int      lf_findoverlap __P((struct lockf *,
           struct lockf *, int, struct lockf ***, struct lockf **));
struct lockf *
        lf_getblock __P((struct lockf *));
int      lf_getlock __P((struct lockf *, struct flock *));
int      lf_setlock __P((struct lockf *));
void     lf_split __P((struct lockf *, struct lockf *));
void     lf_wakelock __P((struct lockf *));
__END_DECLS

#ifdef LOCKF_DEBUG
extern int lockf_debug;

__BEGIN_DECLS
void    lf_print __P((char *, struct lockf *));
void    lf_printlist __P((char *, struct lockf *));
__END_DECLS
#endif