File Explorer fails to update on mount in Win10 build 2004

[jon-blum]

Seen now on multiple Windows 10 machines after upgrading to Win10 build 2004 from 1909: when mounting a virtual drive using EncFS4win v1.10, the drive does not appear in the left-hand pane of an existing File Explorer window. If a new File Explorer window is opened, the drive is visible there.

This may be a DOKAN issue. No such problems occurred in build 1909 or previous.

[jon-blum]

Update: this appears to be a DOKAN issue. It seems that security restrictions have tightened, and -- at least under some circumstances -- the DOKAN service can no longer send the notification message to File Explorer using the SHChangeNotify function, because it's running as a different user (the service user).

The solution is for EncFS4win to send the notifications itself. The patch appears to be simple:

• On mount, after calling initFS, add the following:

ifdef _WIN32

            SHChangeNotify(SHCNE_DRIVEADD, SHCNF_PATH, 
                (LPCVOID) mountPoint, NULL);

endif

• On unmount, after fuse_unmount, add the following:

ifdef _WIN32

SHChangeNotify(SHCNE_DRIVEREMOVED, SHCNF_PATH,
    (LPCVOID)arg->mountPoint.c_str(), NULL);

endif

As far as I've been able to tell in my limited testing, if DOKAN is working then the duplicate notifications do no harm.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jon-blum]

Update: even with the Dokan fix in, the behaviour still seems to be only intermittently successful. I'll continue to test and see if I can find out more on the Dokan end.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.