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