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79 lines
3.1 KiB
C
79 lines
3.1 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* 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 8.1 (Berkeley) 6/11/93
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* $FreeBSD$
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*/
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#ifndef _SYS_LOCKF_H_
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#define _SYS_LOCKF_H_
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#include <sys/queue.h>
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struct vop_advlock_args;
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_LOCKF);
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#endif
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/*
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* The lockf structure is a kernel structure which contains the information
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* associated with a byte range lock. The lockf structures are linked into
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* the inode structure. Locks are sorted by the starting byte of the lock for
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* efficiency.
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*/
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TAILQ_HEAD(locklist, lockf);
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struct lockf {
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short lf_flags; /* 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; /* Byte # of the start of the lock */
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off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */
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caddr_t lf_id; /* Id of the resource holding the lock */
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struct lockf **lf_head; /* Back pointer to the head of the locf list */
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struct inode *lf_inode; /* Back pointer to the inode */
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struct lockf *lf_next; /* Pointer to the next lock on this inode */
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struct locklist lf_blkhd; /* List of requests blocked on this lock */
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TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */
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};
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/* Maximum length of sleep chains to traverse to try and detect deadlock. */
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#define MAXDEPTH 50
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int lf_advlock(struct vop_advlock_args *, struct lockf **, u_quad_t);
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#ifdef LOCKF_DEBUG
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void lf_print(char *, struct lockf *);
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void lf_printlist(char *, struct lockf *);
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#endif
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#endif /* !_SYS_LOCKF_H_ */
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