FreeBSD/Linux Kernel Cross Reference
sys/bsd/hfs/hfs_lockf.h

     /*
      * Copyright (c) 1999,2001-2002 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    
    /*      (c) 1997-1998,2001 Apple Computer, Inc.  All Rights Reserved */
    /*
     * 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.
     *
     *
     *      @(#)hfs_lockf.h 1.0 5/5/98
     *      derived from @(#)lockf.h        8.2 (Berkeley) 10/26/94
     */
    
    #ifndef  __HFS_LOCKF__
    #define  __HFS_LOCKF__
    
    #include <sys/appleapiopts.h>
    
    #ifdef KERNEL
    #ifdef __APPLE_API_PRIVATE
    /*
     * The hfslockf structure is a kernel structure which contains the information
     * associated with a byte range lock.  The hfslockf structures are linked into
     * a cnode's file fork.  Locks are sorted by the starting byte of the lock for
     * efficiency.
     */
    TAILQ_HEAD(locklist, hfslockf);
    
    struct hfslockf {
            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  filefork *lf_fork;  /* Back pointer to the file fork */
            struct  hfslockf *lf_next;  /* Pointer to the next lock on this fork */
            struct  locklist lf_blkhd;  /* List of requests blocked on this lock */
            TAILQ_ENTRY(hfslockf) lf_block;/* A request waiting for a lock */
    };
    
    /* Maximum length of sleep chains to traverse to try and detect deadlock. */
    #define MAXDEPTH 50
    
    __BEGIN_DECLS
    void     hfs_addblock __P((struct hfslockf *, struct hfslockf *));
    int      hfs_clearlock __P((struct hfslockf *));
   int      hfs_findoverlap __P((struct hfslockf *,
               struct hfslockf *, int, struct hfslockf ***, struct hfslockf **));
   struct hfslockf *
            hfs_getblock __P((struct hfslockf *));
   int      hfs_getlock __P((struct hfslockf *, struct flock *));
   int      hfs_setlock __P((struct hfslockf *));
   void     hfs_split __P((struct hfslockf *, struct hfslockf *));
   void     hfs_wakelock __P((struct hfslockf *));
   __END_DECLS
   
   #ifdef LOCKF_DEBUG
   extern int lockf_debug;
   
   __BEGIN_DECLS
   void    hfs_lprint __P((char *, struct hfslockf *));
   void    hfs_lprintlist __P((char *, struct hfslockf *));
   __END_DECLS
   #endif  /* LOCKF_DEBUG */
   #endif /* __APPLE_API_PRIVATE */
   #endif /* KERNEL */
   #endif  /* __HFS_LOCKF__ */

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