1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2007-2009 Google Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
16 * distribution.
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
35 *
36 * Copyright (c) 2019 The FreeBSD Foundation
37 *
38 * Portions of this software were developed by BFF Storage Systems, LLC under
39 * sponsorship from the FreeBSD Foundation.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include <sys/cdefs.h>
64 #include <sys/types.h>
65 #include <sys/param.h>
66 #include <sys/module.h>
67 #include <sys/systm.h>
68 #include <sys/errno.h>
69 #include <sys/param.h>
70 #include <sys/kernel.h>
71 #include <sys/conf.h>
72 #include <sys/mutex.h>
73 #include <sys/proc.h>
74 #include <sys/queue.h>
75 #include <sys/mount.h>
76 #include <sys/vnode.h>
77 #include <sys/stat.h>
78 #include <sys/file.h>
79 #include <sys/buf.h>
80 #include <sys/sdt.h>
81 #include <sys/sysctl.h>
82
83 #include "fuse.h"
84 #include "fuse_file.h"
85 #include "fuse_ipc.h"
86 #include "fuse_internal.h"
87 #include "fuse_node.h"
88
89 static void fuse_bringdown(eventhandler_tag eh_tag);
90 static int fuse_loader(struct module *m, int what, void *arg);
91
92 struct mtx fuse_mtx;
93
94 extern struct vfsops fuse_vfsops;
95 extern struct cdevsw fuse_cdevsw;
96 extern struct vop_vector fuse_fifonops;
97
98 static struct vfsconf fuse_vfsconf = {
99 .vfc_version = VFS_VERSION,
100 .vfc_name = "fusefs",
101 .vfc_vfsops = &fuse_vfsops,
102 .vfc_typenum = -1,
103 .vfc_flags = VFCF_JAIL | VFCF_SYNTHETIC
104 };
105
106 SYSCTL_NODE(_vfs, OID_AUTO, fusefs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
107 "FUSE tunables");
108 SYSCTL_NODE(_vfs_fusefs, OID_AUTO, stats, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
109 "FUSE statistics");
110 SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_major, CTLFLAG_RD,
111 SYSCTL_NULL_INT_PTR, FUSE_KERNEL_VERSION, "FUSE kernel abi major version");
112 SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_minor, CTLFLAG_RD,
113 SYSCTL_NULL_INT_PTR, FUSE_KERNEL_MINOR_VERSION, "FUSE kernel abi minor version");
114 SDT_PROVIDER_DEFINE(fusefs);
115
116 /******************************
117 *
118 * >>> Module management stuff
119 *
120 ******************************/
121
122 static void
fuse_bringdown(eventhandler_tag eh_tag)123 fuse_bringdown(eventhandler_tag eh_tag)
124 {
125 fuse_node_destroy();
126 fuse_internal_destroy();
127 fuse_file_destroy();
128 fuse_ipc_destroy();
129 fuse_device_destroy();
130 mtx_destroy(&fuse_mtx);
131 }
132
133 static int
fuse_loader(struct module * m,int what,void * arg)134 fuse_loader(struct module *m, int what, void *arg)
135 {
136 static eventhandler_tag eh_tag = NULL;
137 int err = 0;
138
139 switch (what) {
140 case MOD_LOAD: /* kldload */
141 mtx_init(&fuse_mtx, "fuse_mtx", NULL, MTX_DEF);
142 err = fuse_device_init();
143 if (err) {
144 mtx_destroy(&fuse_mtx);
145 return (err);
146 }
147 fuse_ipc_init();
148 fuse_file_init();
149 fuse_internal_init();
150 fuse_node_init();
151
152 /* vfs_modevent ignores its first arg */
153 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
154 fuse_bringdown(eh_tag);
155 break;
156 case MOD_UNLOAD:
157 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
158 return (err);
159 fuse_bringdown(eh_tag);
160 break;
161 default:
162 return (EINVAL);
163 }
164
165 return (err);
166 }
167
168 /* Registering the module */
169
170 static moduledata_t fuse_moddata = {
171 "fusefs",
172 fuse_loader,
173 &fuse_vfsconf
174 };
175
176 DECLARE_MODULE(fusefs, fuse_moddata, SI_SUB_VFS, SI_ORDER_MIDDLE);
177 MODULE_VERSION(fusefs, 1);
178