The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/lockf.h

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Scooter Morris at Genentech Inc.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)lockf.h     8.1 (Berkeley) 6/11/93
   37  * $FreeBSD: src/sys/sys/lockf.h,v 1.4.2.1 1999/09/05 08:22:33 peter Exp $
   38  */
   39 
   40 #ifndef _SYS_LOCKF_H_
   41 #define _SYS_LOCKF_H_
   42 
   43 /*
   44  * The lockf structure is a kernel structure which contains the information
   45  * associated with a byte range lock.  The lockf structures are linked into
   46  * the inode structure. Locks are sorted by the starting byte of the lock for
   47  * efficiency.
   48  */
   49 struct lockf {
   50         short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
   51         short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
   52         off_t   lf_start;        /* The byte # of the start of the lock */
   53         off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
   54         caddr_t lf_id;           /* The id of the resource holding the lock */
   55         struct  lockf **lf_head; /* Back pointer to the head of the lockf list */
   56         struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
   57         struct  lockf *lf_block; /* The list of blocked locks */
   58 };
   59 
   60 /* Maximum length of sleep chains to traverse to try and detect deadlock. */
   61 #define MAXDEPTH 50
   62 
   63 int      lf_advlock __P((struct vop_advlock_args *, struct lockf **, u_quad_t));
   64 
   65 #ifdef LOCKF_DEBUG
   66 extern int lockf_debug;
   67 
   68 void    lf_print __P((char *, struct lockf *));
   69 void    lf_printlist __P((char *, struct lockf *));
   70 #endif
   71 
   72 #endif /* !_SYS_LOCKF_H_ */

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