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Diffstat (limited to 'sys/sys/lockf.h')
| -rw-r--r-- | sys/sys/lockf.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/sys/sys/lockf.h b/sys/sys/lockf.h new file mode 100644 index 0000000..09b2b68 --- /dev/null +++ b/sys/sys/lockf.h @@ -0,0 +1,86 @@ +/* + * 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 + * $Id: lockf.h,v 1.1 1994/08/08 17:30:58 davidg Exp $ + */ + +#ifndef _SYS_LOCKF_H_ +#define _SYS_LOCKF_H_ + +/* + * 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. + */ +struct lockf { + short lf_flags; /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */ + short lf_type; /* Lock type: F_RDLCK, F_WRLCK */ + off_t lf_start; /* The byte # of the start of the lock */ + off_t lf_end; /* The byte # of the end of the lock (-1=EOF)*/ + caddr_t lf_id; /* The id of the resource holding the lock */ + struct lockf **lf_head; /* Back pointer to the head of the lockf list */ + struct lockf *lf_next; /* A pointer to the next lock on this inode */ + struct lockf *lf_block; /* The list of blocked locks */ +}; + +/* Maximum length of sleep chains to traverse to try and detect deadlock. */ +#define MAXDEPTH 50 + +__BEGIN_DECLS +int lf_advlock __P((struct vop_advlock_args *, struct lockf **, u_quad_t)); +void lf_addblock __P((struct lockf *, struct lockf *)); +int lf_clearlock __P((struct lockf *)); +int lf_findoverlap __P((struct lockf *, + struct lockf *, int, struct lockf ***, struct lockf **)); +struct lockf * + lf_getblock __P((struct lockf *)); +int lf_getlock __P((struct lockf *, struct flock *)); +int lf_setlock __P((struct lockf *)); +void lf_split __P((struct lockf *, struct lockf *)); +void lf_wakelock __P((struct lockf *)); +__END_DECLS + +#ifdef LOCKF_DEBUG +extern int lockf_debug; + +__BEGIN_DECLS +void lf_print __P((char *, struct lockf *)); +void lf_printlist __P((char *, struct lockf *)); +__END_DECLS +#endif + +#endif |
