83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Scooter Morris at Genentech Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)lockf.h 8.1 (Berkeley) 6/11/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_LOCKF_H_
|
|
#define _SYS_LOCKF_H_
|
|
|
|
#include <sys/queue.h>
|
|
|
|
struct vop_advlock_args;
|
|
|
|
#ifdef MALLOC_DECLARE
|
|
MALLOC_DECLARE(M_LOCKF);
|
|
#endif
|
|
|
|
/*
|
|
* The lockf structure is a kernel structure which contains the information
|
|
* associated with a byte range lock. The lockf structures are linked into
|
|
* the inode structure. Locks are sorted by the starting byte of the lock for
|
|
* efficiency.
|
|
*/
|
|
TAILQ_HEAD(locklist, lockf);
|
|
|
|
struct lockf {
|
|
short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
|
|
short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
|
|
off_t lf_start; /* Byte # of the start of the lock */
|
|
off_t lf_end; /* Byte # of the end of the lock (-1=EOF) */
|
|
caddr_t lf_id; /* Id of the resource holding the lock */
|
|
struct lockf **lf_head; /* Back pointer to the head of the locf list */
|
|
struct inode *lf_inode; /* Back pointer to the inode */
|
|
struct lockf *lf_next; /* Pointer to the next lock on this inode */
|
|
struct locklist lf_blkhd; /* List of requests blocked on this lock */
|
|
TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */
|
|
};
|
|
|
|
/* Maximum length of sleep chains to traverse to try and detect deadlock. */
|
|
#define MAXDEPTH 50
|
|
|
|
int lf_advlock(struct vop_advlock_args *, struct lockf **, u_quad_t);
|
|
|
|
#ifdef LOCKF_DEBUG
|
|
void lf_print(char *, struct lockf *);
|
|
void lf_printlist(char *, struct lockf *);
|
|
#endif
|
|
|
|
#endif /* !_SYS_LOCKF_H_ */
|