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Annotation of Net2/ufs/lockf.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1991 The Regents of the University of California.
                      3:  * 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:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  *
                     36:  *     @(#)lockf.h     7.1 (Berkeley) 2/1/91
                     37:  */
                     38: 
                     39: /*
                     40:  * The lockf structure is a kernel structure which contains all the
                     41:  * information associated with a byte range lock. The lockf structures
                     42:  * are linked into the inode structure. Locks are sorted by the starting
                     43:  * byte of the lock for efficiency.
                     44:  */
                     45: struct lockf {
                     46:        short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
                     47:        short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
                     48:        off_t   lf_start;        /* The byte # of the start of the lock */
                     49:        off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
                     50:        caddr_t lf_id;           /* The id of the resource holding the lock */
                     51:        struct  inode *lf_inode; /* Back pointer to the inode */
                     52:        struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
                     53:        struct  lockf *lf_block; /* The list of blocked locks */
                     54: };
                     55: 
                     56: /*
                     57:  * Maximum length of sleep chains to traverse to try and detect deadlock.
                     58:  */
                     59: #define MAXDEPTH 50
                     60: 
                     61: #ifdef KERNEL
                     62: /*
                     63:  * Public lock manipulation routines
                     64:  */
                     65: extern struct lockf *lf_remove();      /* Remove a lock */
                     66: extern struct lockf *lf_getblock();    /* Return the first blocking lock */
                     67: 
                     68: #ifdef LOCKF_DEBUG
                     69: extern int lockf_debug;
                     70: #endif LOCKF_DEBUG
                     71: #endif KERNEL

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