Question about mount_fusefs

[Igor Konev]

В Tue, 21 May 2019 15:32:29 +0300 (MSK)
"Igor V. Ruzanov" <igorr at pochta-mx.canmos.ru> пишет:

> On Tue, 21 May 2019, Igor Konev via freebsd-questions wrote:
> 
> |Hi, I use fusefs to mount ntfs fs. 
> |And I have a question about the command line options for
> mount_fusefs. |
> |What does key -s mean? What is he doing? I tried to use it but
> without |success.
> |
> From MOUNT_FUSEFS(8) :
> 
> Finally, if special is an integer it will be interpreted as the
> number of the file descriptor of an already open fuse device (used
> when the Fuse
>      library invokes mount_fusefs.  (See DAEMON MOUNTS).
> 
> 
> 
> I guess the key is ised in conjunction of another software doing any
> jobs over opened fuse device files.
> 
> |From MOUNT_FUSEFS(8) :
> |
> |MOUNT_FUSEFS(8)
> |
> |SYNOPSIS
> |     mount_fusefs [-A] [-S] [-v] [-D fuse_daemon] [-O daemon_opts]
> |                  [-s special] [-m node] [-h] [-V] [-o option ...]
> |                  special node [fuse_daemon ...]
> |
> |
> |     -s, --special special
> |             Use special as special
> |
> |So for my case, I can run the mount_fusefs command in two ways:
> |- mount_fusefs special node [fuse_daemon ...]
> |- mount_fusefs -s special node [fuse_daemon]
> |
> |1)
> |
> |$ mount_fusefs /dev/fuse ~/mnt0 ntfs-3g /dev/da0s1 ~/mnt0
> |$ echo $?
> |0
> |
> |$ mount
> |/dev/ada0p4 on / (ufs, local, soft-updates)
> |devfs on /dev (devfs, local, multilabel)
> |...
> |/dev/fuse on /usr/home/user1/mnt0 (fusefs, local, nosuid,
> synchronous, |mounted by user1)
> |
> |2)
> |
> |$ mount_fusefs -s /dev/fuse ~/mnt0 ntfs-3g /dev/da0s1 ~/mnt0
> |mount_fusefs: special specified inconsistently
> |$ echo $?
> |1
> |
> |Ivan Konev
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Igor, thank you for your reply. 
I also tried to use the file descriptor number as an argument for the
–s.

$ ls -ali /dev/fuse
57 crw-rw-rw-  1 root  operator  0x39 21 мая   11:40 /dev/fuse

$ mount_fusefs -s 57 ~/mnt0 ntfs-3g /dev/da0s1 ~/mnt0
mount_fusefs: special specified inconsistently

$ echo $?
1
$ 

My question is why "mount_fusefs /dev/fuse ..." works and "mount_fusefs
-s /dev/fuse ..." and "mount_fusefs -s 57" do not work.

Ivan Konev