sys/sys/lockf.h

   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_ */