projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 1999 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 | /* (c) 1997-1998 Apple Computer, Inc. All Rights Reserved */ | |
| 24 | /* | |
| 25 | * Copyright (c) 1991, 1993 | |
| 26 | * The Regents of the University of California. All rights reserved. | |
| 27 | * | |
| 28 | * This code is derived from software contributed to Berkeley by | |
| 29 | * Scooter Morris at Genentech Inc. | |
| 30 | * | |
| 31 | * Redistribution and use in source and binary forms, with or without | |
| 32 | * modification, are permitted provided that the following conditions | |
| 33 | * are met: | |
| 34 | * 1. Redistributions of source code must retain the above copyright | |
| 35 | * notice, this list of conditions and the following disclaimer. | |
| 36 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 37 | * notice, this list of conditions and the following disclaimer in the | |
| 38 | * documentation and/or other materials provided with the distribution. | |
| 39 | * 3. All advertising materials mentioning features or use of this software | |
| 40 | * must display the following acknowledgement: | |
| 41 | * This product includes software developed by the University of | |
| 42 | * California, Berkeley and its contributors. | |
| 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 | * | |
| 60 | * @(#)hfs_lockf.h 1.0 5/5/98 | |
| 61 | * derived from @(#)lockf.h 8.2 (Berkeley) 10/26/94 | |
| 62 | */ | |
| 63 | ||
| 64 | /* | |
| 65 | * The hfslockf structure is a kernel structure which contains the information | |
| 66 | * associated with a byte range lock. The hfslockf structures are linked into | |
| 67 | * the inode structure. Locks are sorted by the starting byte of the lock for | |
| 68 | * efficiency. | |
| 69 | */ | |
| 70 | TAILQ_HEAD(locklist, hfslockf); | |
| 71 | ||
| 72 | struct hfslockf { | |
| 73 | short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */ | |
| 74 | short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ | |
| 75 | off_t lf_start; /* Byte # of the start of the lock */ | |
| 76 | off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */ | |
| 77 | caddr_t lf_id; /* Id of the resource holding the lock */ | |
| 78 | struct hfsnode *lf_hfsnode; /* Back pointer to the inode */ | |
| 79 | struct hfslockf *lf_next; /* Pointer to the next lock on this inode */ | |
| 80 | struct locklist lf_blkhd; /* List of requests blocked on this lock */ | |
| 81 | TAILQ_ENTRY(hfslockf) lf_block;/* A request waiting for a lock */ | |
| 82 | }; | |
| 83 | ||
| 84 | /* Maximum length of sleep chains to traverse to try and detect deadlock. */ | |
| 85 | #define MAXDEPTH 50 | |
| 86 | ||
| 87 | __BEGIN_DECLS | |
| 88 | void hfs_addblock __P((struct hfslockf *, struct hfslockf *)); | |
| 89 | int hfs_clearlock __P((struct hfslockf *)); | |
| 90 | int hfs_findoverlap __P((struct hfslockf *, | |
| 91 | struct hfslockf *, int, struct hfslockf ***, struct hfslockf **)); | |
| 92 | struct hfslockf * | |
| 93 | hfs_getblock __P((struct hfslockf *)); | |
| 94 | int hfs_getlock __P((struct hfslockf *, struct flock *)); | |
| 95 | int hfs_setlock __P((struct hfslockf *)); | |
| 96 | void hfs_split __P((struct hfslockf *, struct hfslockf *)); | |
| 97 | void hfs_wakelock __P((struct hfslockf *)); | |
| 98 | __END_DECLS | |
| 99 | ||
| 100 | #ifdef LOCKF_DEBUG | |
| 101 | extern int lockf_debug; | |
| 102 | ||
| 103 | __BEGIN_DECLS | |
| 104 | void hfs_lprint __P((char *, struct hfslockf *)); | |
| 105 | void hfs_lprintlist __P((char *, struct hfslockf *)); | |
| 106 | __END_DECLS | |
| 107 | #endif |