Re: usb: gadget: f_mass_storage: detect eject

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On Sat, 18 Aug 2018, Nuno Gonçalves wrote:

> Hi,
> 
> I am trying to get some kind of notification when the host ejects a
> f_mass_storage disk.
> 
> When it happens, and the lun is removable, then the config
> /sys/kernel/config/usb_gadget/*/functions/*/lun.*/file is cleared.
> 
> I understand that sysfs files can not be monitored with inotify, but
> some might be with select/poll/epoll. But this is a configfs.
> 
> I know nothing works for me. I don't know if this is a bug or expected.

It is expected.  No notifications for host-initiated ejects were ever 
put into the f_mass_storage driver.

I have never tried to use f_mass_storage under configfs.  When you do, 
does the driver create its normal sysfs files?

Alan Stern

> Any insight?
> 
> Thanks!
> Nuno
> 
> 




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