1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved. 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Berkeley Software Design Inc's name may not be used to endorse or 14 * promote products derived from this software without specific prior 15 * written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp 30 * $FreeBSD$ 31 */ 32 33 /* 34 * lockd uses the nfssvc system call to get the unique kernel services it needs. 35 * It passes in a request structure with a version number at the start. 36 * This prevents libc from needing to change if the information passed 37 * between lockd and the kernel needs to change. 38 * 39 * If a structure changes, you must bump the version number. 40 */ 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[NFSX_V3FHMAX];/* 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 extern vop_advlock_t *nfs_advlock_p; 93 extern vop_reclaim_t *nfs_reclaim_p; 94 #endif 95