Hi, all
You can simply hack file_storage like this:
1. When gadget_connect/disconnect() hook get called, you can
deliver an udev event to userspace.
2. Write some udev scripts to handle the special udev event and
mount / umount your disk.
2010/1/29 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
> On Thu, 28 Jan 2010, Sergey Lapin wrote:
>
>> Hi, all!
>>
>> What is usage scenario for file storage gadget? I need to achieve this goal:
>>
>> USB cable is out -> /dev/sdaX is mounted om /data and accessible within a device
>> USB cable is inserted -> /dev/sda is unmounted and then exported with
>> g_{file,mass}_storage
>> USB cable is removed -> /dev/sdaX is mounted back.
>>
>> How could I achieve this in generic way?
>
> Currently there is no way to achieve this. You would need to modify
> all the USB device controller drivers. Make them export a file in
> sysfs containing the current connection state and allow processes to
> poll that file.
>
> Alan Stern
>
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