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 | |