The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/fuse/fuse_main.c

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    1 /*
    2  * Copyright (c) 2007-2009 Google Inc.
    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 are
    7  * met:
    8  *
    9  * * Redistributions of source code must retain the above copyright
   10  *   notice, this list of conditions and the following disclaimer.
   11  * * Redistributions in binary form must reproduce the above
   12  *   copyright notice, this list of conditions and the following disclaimer
   13  *   in the documentation and/or other materials provided with the
   14  *   distribution.
   15  * * Neither the name of Google Inc. nor the names of its
   16  *   contributors may be used to endorse or promote products derived from
   17  *   this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * Copyright (C) 2005 Csaba Henk.
   32  * All rights reserved.
   33  *
   34  * Redistribution and use in source and binary forms, with or without
   35  * modification, are permitted provided that the following conditions
   36  * are met:
   37  * 1. Redistributions of source code must retain the above copyright
   38  *    notice, this list of conditions and the following disclaimer.
   39  * 2. Redistributions in binary form must reproduce the above copyright
   40  *    notice, this list of conditions and the following disclaimer in the
   41  *    documentation and/or other materials provided with the distribution.
   42  *
   43  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   46  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   53  * SUCH DAMAGE.
   54  */
   55 
   56 #include <sys/cdefs.h>
   57 __FBSDID("$FreeBSD: releng/10.1/sys/fs/fuse/fuse_main.c 241519 2012-10-13 23:54:26Z attilio $");
   58 
   59 #include <sys/types.h>
   60 #include <sys/module.h>
   61 #include <sys/systm.h>
   62 #include <sys/errno.h>
   63 #include <sys/param.h>
   64 #include <sys/kernel.h>
   65 #include <sys/conf.h>
   66 #include <sys/mutex.h>
   67 #include <sys/proc.h>
   68 #include <sys/mount.h>
   69 #include <sys/vnode.h>
   70 #include <sys/stat.h>
   71 #include <sys/file.h>
   72 #include <sys/buf.h>
   73 #include <sys/sysctl.h>
   74 
   75 #include "fuse.h"
   76 
   77 static void fuse_bringdown(eventhandler_tag eh_tag);
   78 static int fuse_loader(struct module *m, int what, void *arg);
   79 
   80 struct mtx fuse_mtx;
   81 
   82 extern struct vfsops fuse_vfsops;
   83 extern struct cdevsw fuse_cdevsw;
   84 extern struct vop_vector fuse_vnops;
   85 extern int fuse_pbuf_freecnt;
   86 
   87 static struct vfsconf fuse_vfsconf = {
   88         .vfc_version = VFS_VERSION,
   89         .vfc_name = "fusefs",
   90         .vfc_vfsops = &fuse_vfsops,
   91         .vfc_typenum = -1,
   92         .vfc_flags = VFCF_SYNTHETIC
   93 };
   94 
   95 SYSCTL_INT(_vfs_fuse, OID_AUTO, kernelabi_major, CTLFLAG_RD,
   96     0, FUSE_KERNEL_VERSION, "FUSE kernel abi major version");
   97 SYSCTL_INT(_vfs_fuse, OID_AUTO, kernelabi_minor, CTLFLAG_RD,
   98     0, FUSE_KERNEL_MINOR_VERSION, "FUSE kernel abi minor version");
   99 
  100 /******************************
  101  *
  102  * >>> Module management stuff
  103  *
  104  ******************************/
  105 
  106 static void
  107 fuse_bringdown(eventhandler_tag eh_tag)
  108 {
  109 
  110         fuse_ipc_destroy();
  111         fuse_device_destroy();
  112         mtx_destroy(&fuse_mtx);
  113 }
  114 
  115 static int
  116 fuse_loader(struct module *m, int what, void *arg)
  117 {
  118         static eventhandler_tag eh_tag = NULL;
  119         int err = 0;
  120 
  121         switch (what) {
  122         case MOD_LOAD:                  /* kldload */
  123                 fuse_pbuf_freecnt = nswbuf / 2 + 1;
  124                 mtx_init(&fuse_mtx, "fuse_mtx", NULL, MTX_DEF);
  125                 err = fuse_device_init();
  126                 if (err) {
  127                         mtx_destroy(&fuse_mtx);
  128                         return (err);
  129                 }
  130                 fuse_ipc_init();
  131 
  132                 /* vfs_modevent ignores its first arg */
  133                 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
  134                         fuse_bringdown(eh_tag);
  135                 else
  136                         printf("fuse-freebsd: version %s, FUSE ABI %d.%d\n",
  137                             FUSE_FREEBSD_VERSION,
  138                             FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
  139 
  140                 break;
  141         case MOD_UNLOAD:
  142                 if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
  143                         return (err);
  144                 fuse_bringdown(eh_tag);
  145                 break;
  146         default:
  147                 return (EINVAL);
  148         }
  149 
  150         return (err);
  151 }
  152 
  153 /* Registering the module */
  154 
  155 static moduledata_t fuse_moddata = {
  156         "fuse",
  157         fuse_loader,
  158         &fuse_vfsconf
  159 };
  160 
  161 DECLARE_MODULE(fuse, fuse_moddata, SI_SUB_VFS, SI_ORDER_MIDDLE);
  162 MODULE_VERSION(fuse, 1);

Cache object: 94cd4c4ff5bac346c94ba612b114611b


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