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 __FBSDID("$FreeBSD$"); 65 66 #include <sys/types.h> 67 #include <sys/module.h> 68 #include <sys/systm.h> 69 #include <sys/errno.h> 70 #include <sys/param.h> 71 #include <sys/kernel.h> 72 #include <sys/conf.h> 73 #include <sys/mutex.h> 74 #include <sys/proc.h> 75 #include <sys/queue.h> 76 #include <sys/mount.h> 77 #include <sys/vnode.h> 78 #include <sys/stat.h> 79 #include <sys/file.h> 80 #include <sys/buf.h> 81 #include <sys/sdt.h> 82 #include <sys/sysctl.h> 83 84 #include "fuse.h" 85 #include "fuse_file.h" 86 #include "fuse_ipc.h" 87 #include "fuse_internal.h" 88 #include "fuse_node.h" 89 90 static void fuse_bringdown(eventhandler_tag eh_tag); 91 static int fuse_loader(struct module *m, int what, void *arg); 92 93 struct mtx fuse_mtx; 94 95 extern struct vfsops fuse_vfsops; 96 extern struct cdevsw fuse_cdevsw; 97 extern struct vop_vector fuse_fifonops; 98 extern uma_zone_t fuse_pbuf_zone; 99 100 static struct vfsconf fuse_vfsconf = { 101 .vfc_version = VFS_VERSION, 102 .vfc_name = "fusefs", 103 .vfc_vfsops = &fuse_vfsops, 104 .vfc_typenum = -1, 105 .vfc_flags = VFCF_JAIL | VFCF_SYNTHETIC 106 }; 107 108 SYSCTL_NODE(_vfs, OID_AUTO, fusefs, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 109 "FUSE tunables"); 110 SYSCTL_NODE(_vfs_fusefs, OID_AUTO, stats, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 111 "FUSE statistics"); 112 SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_major, CTLFLAG_RD, 113 SYSCTL_NULL_INT_PTR, FUSE_KERNEL_VERSION, "FUSE kernel abi major version"); 114 SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_minor, CTLFLAG_RD, 115 SYSCTL_NULL_INT_PTR, FUSE_KERNEL_MINOR_VERSION, "FUSE kernel abi minor version"); 116 SDT_PROVIDER_DEFINE(fusefs); 117 118 /****************************** 119 * 120 * >>> Module management stuff 121 * 122 ******************************/ 123 124 static void 125 fuse_bringdown(eventhandler_tag eh_tag) 126 { 127 fuse_node_destroy(); 128 fuse_internal_destroy(); 129 fuse_file_destroy(); 130 fuse_ipc_destroy(); 131 fuse_device_destroy(); 132 mtx_destroy(&fuse_mtx); 133 } 134 135 static int 136 fuse_loader(struct module *m, int what, void *arg) 137 { 138 static eventhandler_tag eh_tag = NULL; 139 int err = 0; 140 141 switch (what) { 142 case MOD_LOAD: /* kldload */ 143 mtx_init(&fuse_mtx, "fuse_mtx", NULL, MTX_DEF); 144 err = fuse_device_init(); 145 if (err) { 146 mtx_destroy(&fuse_mtx); 147 return (err); 148 } 149 fuse_ipc_init(); 150 fuse_file_init(); 151 fuse_internal_init(); 152 fuse_node_init(); 153 fuse_pbuf_zone = pbuf_zsecond_create("fusepbuf", nswbuf / 2); 154 155 /* vfs_modevent ignores its first arg */ 156 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf))) 157 fuse_bringdown(eh_tag); 158 break; 159 case MOD_UNLOAD: 160 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf))) 161 return (err); 162 fuse_bringdown(eh_tag); 163 uma_zdestroy(fuse_pbuf_zone); 164 break; 165 default: 166 return (EINVAL); 167 } 168 169 return (err); 170 } 171 172 /* Registering the module */ 173 174 static moduledata_t fuse_moddata = { 175 "fusefs", 176 fuse_loader, 177 &fuse_vfsconf 178 }; 179 180 DECLARE_MODULE(fusefs, fuse_moddata, SI_SUB_VFS, SI_ORDER_MIDDLE); 181 MODULE_VERSION(fusefs, 1); 182