1 /* 2 * Copyright (c) 2004-2018 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * Copyright (c) 1991, 1993 30 * The Regents of the University of California. All rights reserved. 31 * 32 * This code is derived from software contributed to Berkeley by 33 * Scooter Morris at Genentech Inc. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 4. Neither the name of the University nor the names of its contributors 44 * may be used to endorse or promote products derived from this software 45 * without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 57 * SUCH DAMAGE. 58 * 59 * @(#)lockf.h 8.1 (Berkeley) 6/11/93 60 * $FreeBSD: src/sys/sys/lockf.h,v 1.16 2004/04/07 04:19:49 imp Exp $ 61 */ 62 63 #ifndef _SYS_LOCKF_H_ 64 #define _SYS_LOCKF_H_ 65 66 #include <sys/queue.h> 67 #include <sys/cdefs.h> 68 #include <sys/types.h> 69 70 struct vnop_advlock_args; 71 struct vnode; 72 73 #if IMPORTANCE_INHERITANCE 74 #define LF_NOT_BOOSTED 0 75 #define LF_BOOSTED 1 76 #endif /* IMPORTANCE_INHERITANCE */ 77 78 /* 79 * The lockf structure is a kernel structure which contains the information 80 * associated with a byte range lock. The lockf structures are linked into 81 * the vnode structure. Locks are sorted by the starting byte of the lock for 82 * efficiency after they have been committed; uncommitted locks are on the list 83 * head so they may quickly be accessed, and are both short lived and transient. 84 */ 85 TAILQ_HEAD(locklist, lockf); 86 87 struct lockf { 88 short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */ 89 short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ 90 #if IMPORTANCE_INHERITANCE 91 int lf_boosted; /* Is the owner of the lock boosted */ 92 #endif 93 off_t lf_start; /* Byte # of the start of the lock */ 94 off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */ 95 caddr_t lf_id; /* Id of the resource holding the lock */ 96 struct lockf **lf_head; /* Back pointer to the head of the lockf list */ 97 struct vnode *lf_vnode; /* Back pointer to the inode */ 98 struct lockf *lf_next; /* Pointer to the next lock on this inode */ 99 struct locklist lf_blkhd; /* List of requests blocked on this lock */ 100 TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */ 101 struct proc *lf_owner; /* The proc that did the SETLK, if known */ 102 }; 103 104 __BEGIN_DECLS 105 106 #ifdef KERNEL_PRIVATE 107 void lf_init(void); 108 int lf_advlock(struct vnop_advlock_args *); 109 int lf_assert(struct vnop_advlock_args *, void **); 110 void lf_commit(void *, int); 111 void lf_abort_advlocks(vnode_t); 112 113 #ifdef LOCKF_DEBUG 114 void lf_print(char *, struct lockf *); 115 void lf_printlist(char *, struct lockf *); 116 #endif 117 #endif /* KERNEL_PRIVATE */ 118 119 __END_DECLS 120 121 #endif /* !_SYS_LOCKF_H_ */ 122