umount() taking minutes for FUSE filesystems

[Nikolaus Rath]

On Sep 08 2017, Martin Simmons <martin at lispworks.com> wrote:
>> That said, the filesystem could also detect the unmount by the kernel
>> closing the fd. So I'm not sure what is gained by the extra request
>> either... Theoretically, at least under Linux the destroy handler could
>> perform some notify_* operations, but I don't see how that would be
>> useful when the filesystem will be unmounted anyway.
>
> I don't think the kernel itself ever closes the fd (except implicitly in the
> case where the filesystem program dies unexpected).

Sorry, I should have been more precise. The umount is not detected  by
the kernel closing the fd, but by the kernel returning ENODEV when
accessing the fd.

Best,
-Nikolaus

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