David Woodhouse wrote:

Out of interest -- have they (or has anyone else) invented a 'file system' USB device yet? For exporting some file systems, pretending to be a block device really isn't very useful.

There's a file system protocol used by many digital still cameras, which isn't actually camera-specific. Not MSFT-specific either.

Originally called "Picture Transfer Protocol" (PTP) it's actually
more of a remote hierarchical filesystem protocol ... with an event
channel (handy for "new picture" or "inserted new flash memory")
and some built-in search capabilities ("what JPGs do you have").
The strangest capability was a file type tag, which isn't actually
that bizarre.

As with RNDIS, and USB Mass Storage, I understand that support for
PTP is part of MS-Windows since about Win2K.  So a PTP gadget
driver would probably be a useful contribution to Linux.

- Dave





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