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 #define LOCKD_REQ_VERSION 1 44 45 struct lockd_req { 46 int vers; /* keep in sync with kernel please */ 47 int op; /* F_GETLK | F_SETLK | F_UNLCK */ 48 int owner; /* owner of lock, -1 to allocate one */ 49 int owner_rel_ok; /* release owner if no locks left ? */ 50 int *owner_ret; /* owner alloc/free result target */ 51 void *fh; /* NFS file handle */ 52 size_t fh_len; /* NFS file handle length */ 53 u_quad_t offset; /* offset of where to start lock */ 54 u_quad_t len; /* length of range to lock */ 55 int type; /* F_RDLCK | F_WRLCK | F_UNLCK */ 56 struct ucred cred; /* user credentials to use for lock */ 57 struct sockaddr saddr; /* XXX how about non AF_INET ?? */ 58 int pid; /* pid of lock requester */ 59 }; 60 61 /* 62 * The fifo where the kernel writes requests for locks on remote NFS files, 63 * and where lockd reads these requests. 64 * 65 */ 66 #define _PATH_LCKFIFO "/var/run/lock" 67 68 /* 69 * This structure is used to uniquely identify the process which originated 70 * a particular message to lockd. A sequence number is used to differentiate 71 * multiple messages from the same process. A process start time is used to 72 * detect the unlikely, but possible, event of the recycling of a pid. 73 */ 74 struct lockd_msg_ident { 75 pid_t pid; /* The process ID. */ 76 struct timeval pid_start; /* Start time of process id */ 77 int msg_seq; /* Sequence number of message */ 78 }; 79 80 #define LOCKD_MSG_VERSION 1 81 82 /* 83 * The structure that the kernel hands us for each lock request. 84 */ 85 typedef struct __lock_msg { 86 int lm_version; /* which version is this */ 87 struct lockd_msg_ident lm_msg_ident; /* originator of the message */ 88 struct flock lm_fl; /* The lock request. */ 89 int lm_wait; /* The F_WAIT flag. */ 90 int lm_getlk; /* is this a F_GETLK request */ 91 struct sockaddr lm_addr; /* The address. */ 92 int lm_nfsv3; /* If NFS version 3. */ 93 size_t lm_fh_len; /* The file handle length. */ 94 struct ucred lm_cred; /* user cred for lock req */ 95 u_int8_t lm_fh[NFS_SMALLFH];/* The file handle. */ 96 } LOCKD_MSG; 97 98 #define LOCKD_ANS_VERSION 1 99 100 struct lockd_ans { 101 int la_vers; 102 struct lockd_msg_ident la_msg_ident; /* originator of the message */ 103 int la_errno; 104 int la_set_getlk_pid; /* use returned pid */ 105 int la_getlk_pid; /* returned pid for F_GETLK */ 106 }; 107 108 #ifdef _KERNEL 109 int nfs_dolock(struct vop_advlock_args *ap); 110 int nfslockdans(struct proc *p, struct lockd_ans *ansp); 111 int nfslockdreq(struct proc *p, struct lockd_req *reqp); 112 #endif 113