[Bug 212318] sysutils/fusefs-libs: fails to unmount due to a uniq dev node

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212318

            Bug ID: 212318
           Summary: sysutils/fusefs-libs: fails to unmount due to a uniq
                    dev node
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: ben.rubson at gmail.com
                CC: brendan+freebsd at bbqsrc.net, freebsd-bugs at FreeBSD.org,
                    freebsd-fs at FreeBSD.org
             Flags: maintainer-feedback?(brendan+freebsd at bbqsrc.net)

Hello,

I found a bug with fusefs.

In function fuse_unmount_compat22, the following command is used to find out
the device to unmount :
/usr/bin/fstat /dev/fuse*

Here is its output with FreeBSD 11.0-RC2 :

# fstat /dev/fuse*
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W NAME
user1    encfs      15513    4 /dev         60 crw-rw----    fuse rw  /dev/fuse
user2    encfs      15504    4 /dev         60 crw-rw----    fuse rw  /dev/fuse
user3    encfs      15456    4 /dev         60 crw-rw----    fuse rw  /dev/fuse
user4    encfs      15431    4 /dev         60 crw-rw----    fuse rw  /dev/fuse

As you can see all users use the same dev node /dev/fuse.
So when unmounting, user3 will get for example the following message :
umount: unmount of /home/user2/encfs failed: Operation not permitted

I'm not sure where is the issue, if we should expect a uniq dev node per
mounted FS, or if the unmount command is to correct.

Many thanks for your help !

Ben

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