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 */ 31 32 /* 33 * lockd uses the nfssvc system call to get the unique kernel services it needs. 34 * It passes in a request structure with a version number at the start. 35 * This prevents libc from needing to change if the information passed 36 * between lockd and the kernel needs to change. 37 * 38 * If a structure changes, you must bump the version number. 39 */ 40 41 /* 42 * The fifo where the kernel writes requests for locks on remote NFS files, 43 * and where lockd reads these requests. 44 * 45 */ 46 #define _PATH_NFSLCKDEV "nfslock" 47 48 /* 49 * This structure is used to uniquely identify the process which originated 50 * a particular message to lockd. A sequence number is used to differentiate 51 * multiple messages from the same process. A process start time is used to 52 * detect the unlikely, but possible, event of the recycling of a pid. 53 */ 54 struct lockd_msg_ident { 55 pid_t pid; /* The process ID. */ 56 struct timeval pid_start; /* Start time of process id */ 57 int msg_seq; /* Sequence number of message */ 58 }; 59 60 #define LOCKD_MSG_VERSION 3 61 62 /* 63 * The structure that the kernel hands us for each lock request. 64 */ 65 typedef struct __lock_msg { 66 TAILQ_ENTRY(__lock_msg) lm_link; /* internal linkage */ 67 int lm_version; /* which version is this */ 68 struct lockd_msg_ident lm_msg_ident; /* originator of the message */ 69 struct flock lm_fl; /* The lock request. */ 70 int lm_wait; /* The F_WAIT flag. */ 71 int lm_getlk; /* is this a F_GETLK request */ 72 struct sockaddr_storage lm_addr; /* The address. */ 73 int lm_nfsv3; /* If NFS version 3. */ 74 size_t lm_fh_len; /* The file handle length. */ 75 struct xucred lm_cred; /* user cred for lock req */ 76 u_int8_t lm_fh[NFSX_V3FHMAX];/* The file handle. */ 77 } LOCKD_MSG; 78 79 #define LOCKD_ANS_VERSION 1 80 81 struct lockd_ans { 82 int la_vers; 83 struct lockd_msg_ident la_msg_ident; /* originator of the message */ 84 int la_errno; 85 int la_set_getlk_pid; /* use returned pid */ 86 int la_getlk_pid; /* returned pid for F_GETLK */ 87 }; 88 89 #ifdef _KERNEL 90 int nfs_dolock(struct vop_advlock_args *ap); 91 extern vop_advlock_t *nfs_advlock_p; 92 extern vop_reclaim_t *nfs_reclaim_p; 93 #endif 94