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      1 /* $NetBSD: v26.c,v 1.1 2022/01/22 08:09:40 pho Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2021 The NetBSD Foundation, 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
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote
     16  *    products derived from this software without specific prior written
     17  *    permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     25  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if !defined(lint)
     34 __RCSID("$NetBSD: v26.c,v 1.1 2022/01/22 08:09:40 pho Exp $");
     35 #endif /* !lint */
     36 
     37 #include <err.h>
     38 #include <fuse_internal.h>
     39 #include <stdlib.h>
     40 #include <string.h>
     41 
     42 struct fuse_chan *
     43 fuse_mount_v26(const char *mountpoint, struct fuse_args *args) {
     44     int nominal_fd;
     45 
     46     /* fuse_mount() in FUSE 2.6 returns a fuse_chan instead of fd. We
     47      * still need to store the channel in the global list, because
     48      * users may call fuse_destroy() before fuse_unmount().
     49      */
     50     nominal_fd = fuse_mount_v25(mountpoint, args);
     51     if (nominal_fd == -1)
     52         return NULL;
     53 
     54     return fuse_chan_peek(nominal_fd);
     55 }
     56 
     57 static bool
     58 is_same_channel(struct fuse_chan* chan, void* priv) {
     59     return chan == (struct fuse_chan*)priv;
     60 }
     61 
     62 void
     63 fuse_unmount_v26(const char *mountpoint, struct fuse_chan *ch) {
     64     /* Although the API documentation doesn't say so, fuse_unmount()
     65      * from FUSE >= 2.6 < 3.0 in fact allows "ch" to be NULL. */
     66     if (ch)
     67         if (strcmp(mountpoint, fuse_chan_mountpoint(ch)) != 0)
     68             warnx("%s: mountpoint `%s' differs from that was passed to fuse_mount(): %s",
     69                   __func__, mountpoint, fuse_chan_mountpoint(ch));
     70 
     71     /* Ask fuse_unmount_v11() to find the channel object that is
     72      * already in our hand. We are going to need to know its index in
     73      * the global list anyway. */
     74     fuse_unmount_v11(mountpoint);
     75 }
     76 
     77 struct fuse *
     78 fuse_new_v26(struct fuse_chan *ch, struct fuse_args *args,
     79              const void *op, int op_version,
     80              void *user_data) {
     81     int idx;
     82 
     83     /* Although the fuse_chan object is already in our hand, we need
     84      * to know its index in the global list because that's what
     85      * fuse_new_v25() wants. */
     86     if (fuse_chan_find(is_same_channel, &idx, ch) == NULL)
     87         errx(EXIT_FAILURE, "%s: cannot find the channel index", __func__);
     88 
     89     return fuse_new_v25(idx, args, op, op_version, user_data);
     90 }
     91 
     92 struct fuse *
     93 fuse_setup_v26(int argc, char *argv[],
     94                const void *op, int op_version,
     95                char **mountpoint, int *multithreaded,
     96                void *user_data) {
     97     struct fuse* fuse;
     98     struct fuse_cmdline_opts opts;
     99 
    100     fuse = __fuse_setup(argc, argv, op, op_version, user_data, &opts);
    101     if (fuse == NULL)
    102         return NULL;
    103 
    104     *mountpoint = opts.mountpoint; /* Transfer the ownership of the string. */
    105     *multithreaded = !opts.singlethread;
    106     return fuse;
    107 }
    108 
    109 void
    110 fuse_teardown_v26(struct fuse *fuse,
    111                   char *mountpoint __attribute__((__unused__))) {
    112     __fuse_teardown(fuse);
    113 }
    114