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1 | /* |
2 | * Copyright (c) 2011 Jonathan A. Kollasch | |
3 | * All rights reserved. | |
4 | * | |
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 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
15 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
16 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | |
18 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
21 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
22 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
23 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
24 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include <afsconfig.h> | |
28 | #include "afs/param.h" | |
29 | ||
30 | #include <sys/cdefs.h> | |
31 | #include <sys/param.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/kernel.h> | |
34 | #if !defined(AFS_NBSD60_ENV) | |
35 | #include <sys/lkm.h> | |
36 | #endif | |
37 | #include <sys/module.h> | |
38 | #include <sys/systm.h> | |
39 | #include <sys/syscall.h> | |
40 | #include <sys/syscallargs.h> | |
41 | #include <sys/syscallvar.h> | |
42 | ||
43 | #include "afs/sysincludes.h" /* Standard vendor system headers */ | |
44 | #include "afs/afsincludes.h" /* Afs-based standard headers */ | |
45 | ||
46 | extern int afs3_syscall(struct lwp *, const void *, register_t *); | |
47 | extern int afs_xioctl(struct lwp *, const void *, register_t *); | |
48 | extern int Afs_xsetgroups(struct lwp *, const void *, register_t *); | |
49 | ||
50 | #if !defined(AFS_NBSD60_ENV) | |
51 | extern int sys_lkmnosys(struct lwp *, const void *, register_t *); | |
52 | #endif | |
53 | ||
54 | extern struct vfsops afs_vfsops; | |
55 | ||
56 | static const struct sysent openafs_sysent = { | |
57 | sizeof(struct afs_sysargs)/sizeof(register_t), | |
58 | sizeof(struct afs_sysargs), | |
59 | 0, | |
60 | afs3_syscall, | |
61 | }; | |
62 | ||
63 | static struct sysent old_sysent; | |
64 | static sy_call_t *old_setgroups; | |
65 | static sy_call_t *old_ioctl; | |
66 | ||
67 | MODULE(MODULE_CLASS_VFS, openafs, NULL); | |
68 | ||
69 | #if defined(AFS_NBSD70_ENV) | |
70 | #define SYS_NOSYSCALL sys_nomodule | |
71 | #elif defined(AFS_NBSD60_ENV) | |
72 | #define SYS_NOSYSCALL sys_nosys | |
73 | #else | |
74 | #define SYS_NOSYSCALL sys_lkmnosys | |
75 | #endif | |
76 | ||
77 | static int | |
78 | openafs_modcmd(modcmd_t cmd, void *arg) | |
79 | { | |
80 | struct sysent *se; | |
81 | int error; | |
82 | ||
83 | #ifndef RUMP | |
84 | se = sysent; | |
85 | #else | |
86 | se = emul_netbsd.e_sysent; | |
87 | #endif | |
88 | ||
89 | switch (cmd) { | |
90 | case MODULE_CMD_INIT: | |
91 | error = vfs_attach(&afs_vfsops); | |
92 | if (error != 0) | |
93 | break; | |
94 | old_sysent = se[AFS_SYSCALL]; | |
95 | old_setgroups = se[SYS_setgroups].sy_call; | |
96 | old_ioctl = se[SYS_ioctl].sy_call; | |
97 | ||
98 | #if defined(RUMP) | |
99 | if (true) { | |
100 | #else | |
101 | if (old_sysent.sy_call == SYS_NOSYSCALL) { | |
102 | #endif | |
103 | #if defined(AFS_NBSD60_ENV) | |
104 | kernconfig_lock(); | |
105 | #endif | |
106 | se[AFS_SYSCALL] = openafs_sysent; | |
107 | se[SYS_setgroups].sy_call = Afs_xsetgroups; | |
108 | se[SYS_ioctl].sy_call = afs_xioctl; | |
109 | #if defined(AFS_NBSD60_ENV) | |
110 | kernconfig_unlock(); | |
111 | #endif | |
112 | } else { | |
113 | error = EBUSY; | |
114 | } | |
115 | if (error != 0) | |
116 | break; | |
117 | break; | |
118 | case MODULE_CMD_FINI: | |
119 | #if defined(AFS_NBSD60_ENV) | |
120 | kernconfig_lock(); | |
121 | #endif | |
122 | se[SYS_ioctl].sy_call = old_ioctl; | |
123 | se[SYS_setgroups].sy_call = old_setgroups; | |
124 | se[AFS_SYSCALL] = old_sysent; | |
125 | #if defined(AFS_NBSD60_ENV) | |
126 | kernconfig_unlock(); | |
127 | #endif | |
128 | error = vfs_detach(&afs_vfsops); | |
129 | if (error != 0) | |
130 | break; | |
131 | break; | |
132 | #if defined(AFS_NBSD70_ENV) | |
133 | case MODULE_CMD_AUTOUNLOAD: | |
134 | error = EBUSY; | |
135 | break; | |
136 | #endif | |
137 | default: | |
138 | error = ENOTTY; | |
139 | break; | |
140 | } | |
141 | ||
142 | return error; | |
143 | } |