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v21.c revision 1.1 
      1 /* $NetBSD: v21.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: v21.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 
     40 /* Like FUSE 1.x, fuse_mount() is supposed to be called before
     41  * fuse_new(). The argument "opts" is a comma-separated string of
     42  * mount options. */
     43 int
     44 fuse_mount_v21(const char *mountpoint, const char *opts) {
     45     struct fuse_args args = FUSE_ARGS_INIT(0, NULL);
     46     int nominal_fd = -1;
     47 
     48     if (opts) {
     49         if (fuse_opt_add_arg(&args, "-o") != 0)
     50             goto free_args;
     51 
     52         if (fuse_opt_add_arg(&args, opts) != 0)
     53             goto free_args;
     54     }
     55 
     56     nominal_fd = fuse_mount_v25(mountpoint, &args);
     57 
     58   free_args:
     59     fuse_opt_free_args(&args);
     60     return nominal_fd;
     61 }
     62 
     63 struct fuse *
     64 fuse_new_v21(int fd, const char *opts, const void *op,
     65              int op_version, void *user_data) {
     66     struct fuse_chan* chan;
     67     struct fuse* fuse;
     68     int rv;
     69 
     70     chan = fuse_chan_peek(fd);
     71     if (!chan) {
     72         warnx("%s: invalid channel: %d", __func__, fd);
     73         return NULL;
     74     }
     75 
     76     /* "opts" is another set of options to be interpreted by the FUSE
     77      * library, as opposed to the ones passed to fuse_mount() which is
     78      * handled by Linux kernel. We don't have such a distinction, so
     79      * insert them at argv[1] (not at the end of argv, because there
     80      * may be non-options there). */
     81     if (opts) {
     82         if (fuse_opt_insert_arg(fuse_chan_args(chan), 1, "-o") != 0) {
     83             fuse_chan_destroy(chan);
     84             return NULL;
     85         }
     86         if (fuse_opt_insert_arg(fuse_chan_args(chan), 2, opts) != 0) {
     87             fuse_chan_destroy(chan);
     88             return NULL;
     89         }
     90     }
     91 
     92     fuse = __fuse_new(fuse_chan_args(chan), op, op_version, user_data);
     93     if (!fuse) {
     94         fuse_chan_destroy(chan);
     95         return NULL;
     96     }
     97     fuse_chan_set_fuse(chan, fuse);
     98 
     99     /* Now we can finally mount it. Hope it's not too late. */
    100     rv = fuse_mount_v30(fuse, fuse_chan_mountpoint(chan));
    101     if (rv != 0) {
    102         fuse_destroy_v30(fuse);
    103         fuse_chan_destroy(chan);
    104         return NULL;
    105     }
    106 
    107     return fuse;
    108 }
    109