FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_lock.h

     /*-
      * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved.
      * 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. Berkeley Software Design Inc's name may not be used to endorse or
     *    promote products derived from this software without specific prior
     *    written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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.
     *
     *      from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp
     * $FreeBSD: releng/11.2/sys/nfs/nfs_lock.h 214048 2010-10-19 00:20:00Z rmacklem $
     */
    
    /*
     * lockd uses the nfssvc system call to get the unique kernel services it needs.
     * It passes in a request structure with a version number at the start.
     * This prevents libc from needing to change if the information passed
     * between lockd and the kernel needs to change.
     *
     * If a structure changes, you must bump the version number.
     */
    
    /*
     * The fifo where the kernel writes requests for locks on remote NFS files,
     * and where lockd reads these requests.
     *
     */
    #define _PATH_NFSLCKDEV "nfslock"
    
    /*
     * This structure is used to uniquely identify the process which originated
     * a particular message to lockd.  A sequence number is used to differentiate
     * multiple messages from the same process.  A process start time is used to
     * detect the unlikely, but possible, event of the recycling of a pid.
     */
    struct lockd_msg_ident {
            pid_t           pid;            /* The process ID. */
            struct timeval  pid_start;      /* Start time of process id */
            int             msg_seq;        /* Sequence number of message */
    };
    
    #define LOCKD_MSG_VERSION       3
    
    /*
     * The structure that the kernel hands us for each lock request.
     */
    typedef struct __lock_msg {
            TAILQ_ENTRY(__lock_msg) lm_link;        /* internal linkage */
            int                     lm_version;     /* which version is this */
            struct lockd_msg_ident  lm_msg_ident;   /* originator of the message */
            struct flock            lm_fl;             /* The lock request. */
            int                     lm_wait;           /* The F_WAIT flag. */
            int                     lm_getlk;               /* is this a F_GETLK request */
            struct sockaddr_storage lm_addr;                /* The address. */
            int                     lm_nfsv3;               /* If NFS version 3. */
            size_t                  lm_fh_len;              /* The file handle length. */
            struct xucred           lm_cred;                /* user cred for lock req */
            u_int8_t                lm_fh[NFSX_V3FHMAX];/* The file handle. */
    } LOCKD_MSG;
    
    #define LOCKD_ANS_VERSION       1
    
    struct lockd_ans {
            int             la_vers;
            struct lockd_msg_ident  la_msg_ident;   /* originator of the message */
            int             la_errno;
            int             la_set_getlk_pid;               /* use returned pid */
            int             la_getlk_pid;           /* returned pid for F_GETLK */
    };
    
    #ifdef _KERNEL
    int     nfs_dolock(struct vop_advlock_args *ap);
    extern  vop_advlock_t *nfs_advlock_p;
    extern  vop_reclaim_t *nfs_reclaim_p;
    #endif

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