Messages in this thread | | | Date | Mon, 20 Aug 2012 04:19:38 -0700 | From | Joel Becker <> | Subject | Re: [RFC 0/2] USB gadget - configfs |
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On Mon, Aug 20, 2012 at 01:01:03PM +0200, Sebastian Andrzej Siewior wrote: > On 08/20/2012 07:59 AM, Joel Becker wrote: > > I think what you want here is a symlink. Create a directory > >high in the tree called 'ready' or 'available', and when you want to > >lock the device in place, symlink it into that directory. This will pin > >the item. You can also make use of the ->allow_link() and ->drop_link() > >callbacks to prevent symlinking an item until it is fully configured, > >and prevent unlinking an item that is in use. > > > > $ ln -s /cfg/usb-function-gadget/G1/C1/F1/f_mass_storage/lun0 \ > > /cfg/usb-function-gadget/ready/ > > > >or something like that. > > That would be something like > > $ ln -s /cfg/usb-function-gadget/G1 \ > /cfg/usb-function-gadget/udcs/udc1/ > > Where we "bind" the complete gadget (G1) including the mass storage > configuration to the UDC (udc1 in this example). > > At this point we could snapshot the complete configuration so we have > it persistent and if somebody changes attributes within /cfg/usb- > function-gadget/G1 it doesn't matter because we have the copy. > > Is it _this_ what you want us to do? A snapshot?
No, I don't see why you would snapshot. You can, btw, reject ->store_attribute() operations once you are in a "ready" state. That's different from preventing the removal of items.
Joel
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