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 1.10 1999/08/28 00:51:51 peter Exp $
   38  * $DragonFly: src/sys/sys/lockf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
   39  */
   40 
   41 #ifndef _SYS_LOCKF_H_
   42 #define _SYS_LOCKF_H_
   43 
   44 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
   45 #error "This file should not be included by userland programs."
   46 #endif
   47 
   48 #ifndef _SYS_TYPES_H_
   49 #include <sys/types.h>
   50 #endif
   51 #ifndef _SYS_QUEUE_H_
   52 #include <sys/queue.h>
   53 #endif
   54 
   55 struct vop_advlock_args;
   56 
   57 /*
   58  * The lockf structure is a kernel structure which contains the information
   59  * associated with the byte range locks on an inode. The lockf structure is
   60  * embedded in the inode structure.
   61  */
   62 
   63 struct lockf_range {
   64         short            lf_type;       /* Lock type: F_RDLCK, F_WRLCK */
   65         short            lf_flags;      /* Lock flags: F_NOEND */
   66         off_t            lf_start;      /* Byte # of the start of the lock */
   67         off_t            lf_end;        /* Byte # of the end of the lock, */
   68         struct proc     *lf_owner;      /* owning process, NULL for flock locks */
   69         TAILQ_ENTRY(lockf_range) lf_link;
   70 };
   71 
   72 TAILQ_HEAD(lockf_range_list, lockf_range);
   73 
   74 struct lockf {
   75         struct lockf_range_list lf_range;
   76         struct lockf_range_list lf_blocked;
   77         int init_done;
   78 };
   79 
   80 #ifdef _KERNEL
   81 int     lf_advlock(struct vop_advlock_args *, struct lockf *, u_quad_t);
   82 void    lf_count_adjust(struct proc *, int);
   83 
   84 extern int maxposixlocksperuid;
   85 #endif
   86 
   87 #endif /* !_SYS_LOCKF_H_ */

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