1/* 2 * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * The contents of this file constitute Original Code as defined in and 7 * are subject to the Apple Public Source License Version 1.1 (the 8 * "License"). You may not use this file except in compliance with the 9 * License. Please obtain a copy of the License at 10 * http://www.apple.com/publicsource and read it before using this file. 11 * 12 * This Original Code and all software distributed under the License are 13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER 14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the 17 * License for the specific language governing rights and limitations 18 * under the License. 19 * 20 * @APPLE_LICENSE_HEADER_END@ 21 */ 22/* 23 * Copyright (c) 1991, 1993 24 * The Regents of the University of California. All rights reserved. 25 * 26 * This code is derived from software contributed to Berkeley by 27 * Scooter Morris at Genentech Inc. 28 * 29 * Redistribution and use in source and binary forms, with or without 30 * modification, are permitted provided that the following conditions 31 * are met: 32 * 1. Redistributions of source code must retain the above copyright 33 * notice, this list of conditions and the following disclaimer. 34 * 2. Redistributions in binary form must reproduce the above copyright 35 * notice, this list of conditions and the following disclaimer in the 36 * documentation and/or other materials provided with the distribution. 37 * 4. Neither the name of the University nor the names of its contributors 38 * may be used to endorse or promote products derived from this software 39 * without specific prior written permission. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * @(#)lockf.h 8.1 (Berkeley) 6/11/93 54 * $FreeBSD: src/sys/sys/lockf.h,v 1.16 2004/04/07 04:19:49 imp Exp $ 55 */ 56 57#ifndef _SYS_LOCKF_H_ 58#define _SYS_LOCKF_H_ 59 60#include <sys/queue.h> 61#include <sys/cdefs.h> 62 63struct vnop_advlock_args; 64struct vnode; 65 66#ifdef MALLOC_DECLARE 67MALLOC_DECLARE(M_LOCKF); 68#endif 69 70/* 71 * The lockf structure is a kernel structure which contains the information 72 * associated with a byte range lock. The lockf structures are linked into 73 * the inode structure. Locks are sorted by the starting byte of the lock for 74 * efficiency. 75 */ 76TAILQ_HEAD(locklist, lockf); 77 78#if __DARWIN_ALIGN_POWER 79#pragma options align=power 80#endif 81 82struct lockf { 83 short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */ 84 short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ 85 off_t lf_start; /* Byte # of the start of the lock */ 86 off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */ 87 caddr_t lf_id; /* Id of the resource holding the lock */ 88 struct lockf **lf_head; /* Back pointer to the head of the locf list */ 89 struct vnode *lf_vnode; /* Back pointer to the inode */ 90 struct lockf *lf_next; /* Pointer to the next lock on this inode */ 91 struct locklist lf_blkhd; /* List of requests blocked on this lock */ 92 TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */ 93}; 94 95#if __DARWIN_ALIGN_POWER 96#pragma options align=reset 97#endif 98 99/* Maximum length of sleep chains to traverse to try and detect deadlock. */ 100#define MAXDEPTH 50 101 102__BEGIN_DECLS 103 104int lf_advlock(struct vnop_advlock_args *); 105 106#ifdef LOCKF_DEBUG 107void lf_print(char *, struct lockf *); 108void lf_printlist(char *, struct lockf *); 109#endif 110 111__END_DECLS 112 113#endif /* !_SYS_LOCKF_H_ */ 114