Re: [Qemu-devel] [PULL v2 2/2] usb: mtp filesharing

[Gerd Hoffmann]

On Mi, 2014-04-23 at 16:09 +0200, Laszlo Ersek wrote:
> On 04/23/14 10:31, Gerd Hoffmann wrote:
> > Implementation of a USB Media Transfer Device device for easy
> > filesharing.  Read-only.  No access control inside qemu, it will
> > happily export any file it is able to open to the guest, i.e.
> > standard unix access rights for the qemu process apply.
> > 
> > Signed-off-by: Gerd Hoffmann <address@hidden>
> > ---
> >  default-configs/usb.mak |    1 +
> >  hw/usb/Makefile.objs    |    4 +
> >  hw/usb/dev-mtp.c        | 1103 
> > +++++++++++++++++++++++++++++++++++++++++++++++
> >  trace-events            |   21 +
> >  4 files changed, 1129 insertions(+)
> >  create mode 100644 hw/usb/dev-mtp.c
> 
> Not a review or a note of any significance, just a question: how does it
> appear in the guest (Windows and Linux)? Mountable block device
> containing vfat, exposed by some guest driver?

Like a modern android phone (4.x, which doesn't export the sdcard as
usb-storage any more), except that it is read-only (i.e. host -> guest
xfer only).

Guest integration usually is at file manager level.

Windows has a shell extension for MTP, so it shows up in the explorer,
you can browse like any other folder, you can copy stuff, and if you
double-click a file it will work just fine too (as far I know windows
does a temporary copy to a real file system to handle this transparently
for applications).  

Linux filemanagers like gnome nautilus work simliar.

cheers,
  Gerd