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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)lockf.h     8.1 (Berkeley) 6/11/93
  33  * $FreeBSD: src/sys/sys/lockf.h,v 1.10 1999/08/28 00:51:51 peter Exp $
  34  * $DragonFly: src/sys/sys/lockf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_LOCKF_H_
  38 #define _SYS_LOCKF_H_
  39
  40 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  41 #error "This file should not be included by userland programs."
  42 #endif
  43
  44 #ifndef _SYS_TYPES_H_
  45 #include <sys/types.h>
  46 #endif
  47 #ifndef _SYS_QUEUE_H_
  48 #include <sys/queue.h>
  49 #endif
  50
  51 struct vop_advlock_args;
  52
  53 /*
  54  * The lockf structure is a kernel structure which contains the information
  55  * associated with the byte range locks on an inode. The lockf structure is
  56  * embedded in the inode structure.
  57  */
  58
  59 struct lockf_range {
  60         short            lf_type;       /* Lock type: F_RDLCK, F_WRLCK */
  61         short            lf_flags;      /* Lock flags: F_NOEND */
  62         off_t            lf_start;      /* Byte # of the start of the lock */
  63         off_t            lf_end;        /* Byte # of the end of the lock, */
  64         struct proc     *lf_owner;      /* owning process, NULL for flock locks */
  65         TAILQ_ENTRY(lockf_range) lf_link;
  66 };
  67
  68 TAILQ_HEAD(lockf_range_list, lockf_range);
  69
  70 struct lockf {
  71         struct lockf_range_list lf_range;
  72         struct lockf_range_list lf_blocked;
  73         int init_done;
  74 };
  75
  76 #ifdef _KERNEL
  77 int     lf_advlock(struct vop_advlock_args *, struct lockf *, u_quad_t);
  78 void    lf_count_adjust(struct proc *, int);
  79
  80 extern int maxposixlocksperuid;
  81 #endif
  82
  83 #endif /* !_SYS_LOCKF_H_ */