The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/lockf.h

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    1 /*-
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Scooter Morris at Genentech Inc.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)lockf.h     8.1 (Berkeley) 6/11/93
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _SYS_LOCKF_H_
   37 #define _SYS_LOCKF_H_
   38 
   39 #include <sys/queue.h>
   40 
   41 struct vop_advlock_args;
   42 
   43 #ifdef MALLOC_DECLARE
   44 MALLOC_DECLARE(M_LOCKF);
   45 #endif
   46 
   47 /*
   48  * The lockf structure is a kernel structure which contains the information
   49  * associated with a byte range lock.  The lockf structures are linked into
   50  * the inode structure. Locks are sorted by the starting byte of the lock for
   51  * efficiency.
   52  */
   53 TAILQ_HEAD(locklist, lockf);
   54 
   55 struct lockf {
   56         short   lf_flags;           /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
   57         short   lf_type;            /* Lock type: F_RDLCK, F_WRLCK */
   58         off_t   lf_start;           /* Byte # of the start of the lock */
   59         off_t   lf_end;             /* Byte # of the end of the lock (-1=EOF) */
   60         caddr_t lf_id;              /* Id of the resource holding the lock */
   61         struct  lockf **lf_head;    /* Back pointer to the head of the locf list */
   62         struct  inode *lf_inode;    /* Back pointer to the inode */
   63         struct  lockf *lf_next;     /* Pointer to the next lock on this inode */
   64         struct  locklist lf_blkhd;  /* List of requests blocked on this lock */
   65         TAILQ_ENTRY(lockf) lf_block;/* A request waiting for a lock */
   66 };
   67 
   68 /* Maximum length of sleep chains to traverse to try and detect deadlock. */
   69 #define MAXDEPTH 50
   70 
   71 int      lf_advlock(struct vop_advlock_args *, struct lockf **, u_quad_t);
   72 
   73 #ifdef LOCKF_DEBUG
   74 void    lf_print(char *, struct lockf *);
   75 void    lf_printlist(char *, struct lockf *);
   76 #endif
   77 
   78 #endif /* !_SYS_LOCKF_H_ */

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