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: src/sys/nfsclient/nfs_lock.h,v 1.6 2004/12/06 08:31:32 phk Exp $
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
93
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