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/nfsclient/nfs_lock.h

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    1 /*-
    2  * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved.
    3  * Redistribution and use in source and binary forms, with or without
    4  * modification, are permitted provided that the following conditions
    5  * are met:
    6  * 1. Redistributions of source code must retain the above copyright
    7  *    notice, this list of conditions and the following disclaimer.
    8  * 2. Redistributions in binary form must reproduce the above copyright
    9  *    notice, this list of conditions and the following disclaimer in the
   10  *    documentation and/or other materials provided with the distribution.
   11  * 3. Berkeley Software Design Inc's name may not be used to endorse or
   12  *    promote products derived from this software without specific prior
   13  *    written permission.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  *      from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp
   28  * $FreeBSD$
   29  */
   30 
   31 /*
   32  * lockd uses the nfssvc system call to get the unique kernel services it needs.
   33  * It passes in a request structure with a version number at the start.
   34  * This prevents libc from needing to change if the information passed
   35  * between lockd and the kernel needs to change.
   36  *
   37  * If a structure changes, you must bump the version number.
   38  */
   39 
   40 #include <nfs/nfsproto.h>
   41 
   42 /*
   43  * The fifo where the kernel writes requests for locks on remote NFS files,
   44  * and where lockd reads these requests.
   45  *
   46  */
   47 #define _PATH_NFSLCKDEV "nfslock"
   48 
   49 /*
   50  * This structure is used to uniquely identify the process which originated
   51  * a particular message to lockd.  A sequence number is used to differentiate
   52  * multiple messages from the same process.  A process start time is used to
   53  * detect the unlikely, but possible, event of the recycling of a pid.
   54  */
   55 struct lockd_msg_ident {
   56         pid_t           pid;            /* The process ID. */
   57         struct timeval  pid_start;      /* Start time of process id */
   58         int             msg_seq;        /* Sequence number of message */
   59 };
   60 
   61 #define LOCKD_MSG_VERSION       3
   62 
   63 /*
   64  * The structure that the kernel hands us for each lock request.
   65  */
   66 typedef struct __lock_msg {
   67         TAILQ_ENTRY(__lock_msg) lm_link;        /* internal linkage */
   68         int                     lm_version;     /* which version is this */
   69         struct lockd_msg_ident  lm_msg_ident;   /* originator of the message */
   70         struct flock            lm_fl;             /* The lock request. */
   71         int                     lm_wait;           /* The F_WAIT flag. */
   72         int                     lm_getlk;               /* is this a F_GETLK request */
   73         struct sockaddr_storage lm_addr;                /* The address. */
   74         int                     lm_nfsv3;               /* If NFS version 3. */
   75         size_t                  lm_fh_len;              /* The file handle length. */
   76         struct xucred           lm_cred;                /* user cred for lock req */
   77         u_int8_t                lm_fh[NFS_SMALLFH];/* The file handle. */
   78 } LOCKD_MSG;
   79 
   80 #define LOCKD_ANS_VERSION       1
   81 
   82 struct lockd_ans {
   83         int             la_vers;
   84         struct lockd_msg_ident  la_msg_ident;   /* originator of the message */
   85         int             la_errno;
   86         int             la_set_getlk_pid;               /* use returned pid */
   87         int             la_getlk_pid;           /* returned pid for F_GETLK */
   88 };
   89 
   90 #ifdef _KERNEL
   91 int     nfs_dolock(struct vop_advlock_args *ap);
   92 #endif

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