1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*-
* Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp
* $FreeBSD$
*/
/*
* lockd uses the nfssvc system call to get the unique kernel services it needs.
* It passes in a request structure with a version number at the start.
* This prevents libc from needing to change if the information passed
* between lockd and the kernel needs to change.
*
* If a structure changes, you must bump the version number.
*/
#include <nfs/nfsproto.h>
/*
* The fifo where the kernel writes requests for locks on remote NFS files,
* and where lockd reads these requests.
*
*/
#define _PATH_LCKFIFO "/var/run/lock"
/*
* This structure is used to uniquely identify the process which originated
* a particular message to lockd. A sequence number is used to differentiate
* multiple messages from the same process. A process start time is used to
* detect the unlikely, but possible, event of the recycling of a pid.
*/
struct lockd_msg_ident {
pid_t pid; /* The process ID. */
struct timeval pid_start; /* Start time of process id */
int msg_seq; /* Sequence number of message */
};
#define LOCKD_MSG_VERSION 1
/*
* The structure that the kernel hands us for each lock request.
*/
typedef struct __lock_msg {
int lm_version; /* which version is this */
struct lockd_msg_ident lm_msg_ident; /* originator of the message */
struct flock lm_fl; /* The lock request. */
int lm_wait; /* The F_WAIT flag. */
int lm_getlk; /* is this a F_GETLK request */
struct sockaddr lm_addr; /* The address. */
int lm_nfsv3; /* If NFS version 3. */
size_t lm_fh_len; /* The file handle length. */
struct ucred lm_cred; /* user cred for lock req */
u_int8_t lm_fh[NFS_SMALLFH];/* The file handle. */
} LOCKD_MSG;
#define LOCKD_ANS_VERSION 1
struct lockd_ans {
int la_vers;
struct lockd_msg_ident la_msg_ident; /* originator of the message */
int la_errno;
int la_set_getlk_pid; /* use returned pid */
int la_getlk_pid; /* returned pid for F_GETLK */
};
#ifdef _KERNEL
int nfs_dolock(struct vop_advlock_args *ap);
int nfslockdans(struct proc *p, struct lockd_ans *ansp);
#endif
|
