[dolphin] [Bug 436658] New: CIFS mounts not detected as mounted

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https://bugs.kde.org/show_bug.cgi?id=436658

            Bug ID: 436658
           Summary: CIFS mounts not detected as mounted
           Product: dolphin
           Version: 20.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: places
          Assignee: dolphin-bugs-null at kde.org
          Reporter: nick at ufer.dev
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Just upgraded from 20.10 to 21.04.

Dolphin has a list in the left sidebar called 'Remote'. In this list I have
network shares from fstab which will mount on first click. The shares are
mounted successfully, but Dolphin somehow doesn't get it. It thinks they are
not mounted and tries every time I click on the folder to mount them again
despite being already mounted. When I navigate into a mounted share I can see
all files but the "TiB/GiB free" indicator doesn't work too. It shows the free
space on / and not the mounted share. I also have a nfs share where everything
is working. Just cifs doesn't work.
Because of that I can't normally access the shares via the sidebar but if I
open the path in dolphin manually it works.

Error message from dolphin: 

An error occurred while accessing 'Home', the system responded: mount
error(16): Device or resource busy
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log
messages (dmesg)

I don't know what 'Home' should be, I don't have a mount with that name.


dmesg:
[ 1465.972263] CIFS: Attempting to mount \\192.168....
[ 1693.215546] CIFS: Attempting to mount \\192.168....


STEPS TO REPRODUCE
1. Add cifs shares to /etc/fstab
2. try to mount them via dolphin
3. Mount is successful, Dolphin doesn't recognize it was successful

OBSERVED RESULT

Dolphin doesn't detect that they are already mounted.


EXPECTED RESULT

Dolphin should detect mounts.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
(available in About System)
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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