77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
/*
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Scooter Morris at Genentech Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)lockf.h 7.1 (Berkeley) 2/1/91
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*/
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#ifndef _UFS_LOCKF_H_
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#define _UFS_LOCKF_H_
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/*
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* The lockf structure is a kernel structure which contains all the
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* information associated with a byte range lock. The lockf structures
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* are linked into the inode structure. Locks are sorted by the starting
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* byte of the lock for efficiency.
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*/
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struct lockf {
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short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
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short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
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off_t lf_start; /* The byte # of the start of the lock */
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off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/
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caddr_t lf_id; /* The id of the resource holding the lock */
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struct inode *lf_inode; /* Back pointer to the inode */
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struct lockf *lf_next; /* A pointer to the next lock on this inode */
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struct lockf *lf_block; /* The list of blocked locks */
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};
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/*
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* Maximum length of sleep chains to traverse to try and detect deadlock.
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*/
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#define MAXDEPTH 50
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#ifdef KERNEL
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/*
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* Public lock manipulation routines
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*/
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extern struct lockf *lf_remove(); /* Remove a lock */
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extern struct lockf *lf_getblock(); /* Return the first blocking lock */
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#ifdef LOCKF_DEBUG
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extern int lockf_debug;
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#endif LOCKF_DEBUG
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#endif KERNEL
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#endif /* !_UFS_LOCKF_H_ */
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