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Annotation of Net2/ufs/lockf.h, revision 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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