On Wed, Jun 04, 2008 at 07:29:27AM +0100, Andy Green wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Somebody in the thread at some point said: > | I think we could get around with pretending to be a digital camera / media > | player instead. IIRC the protocol prefered by windows for these is more > | like a file server protocol (i.e. commands at file level) although maybe > | windows doesn't allow to download files from media players and may not > | allow to upload on cameras. > | But that should get around the exclusive access problem. > |
[...] > > The thing that bothers me is the effective requirement to force unmount > the filesystem either way. It's for sure you wanted that filesystem > mounted in the device when it isn't presented as mass storage gadget, so > it limits you to scenarios where you never hold the files in there open > long term. Sorry if i was not clear. I didn't have time to google the exact protocol. But i was suggesting to explore PTP/MTP as alternative protocol to usb storage. citing http://en.wikipedia.org/wiki/Media_Transfer_Protocol: |> A main reason for using MTP rather than for example the USB mass storage |> device class is that the latter operates at the granularity of a mass |> storage device block (usually in practice, a FAT block), rather than at the |> logical file level. In other words, the USB mass storage class is designed |> to give a host computer undifferentiated access to bulk mass storage, such |> as compact flash, rather than to a file system, which might be safely |> shared with the target device (except for specific files which the host |> might be modifying/accessing). In practice, therefore, when a USB host |> computer has mounted an MSC partition, it assumes absolute control of the |> storage, which then may not be safely modified without risk of data |> corruption until the host computer has severed the connection[citation |> needed]. |> |> MTP and PTP specifically overcome this issue by making the unit of |> managed storage a local file rather than an entire (possibly very large) |> unit of mass storage at the block level. While this protocol seems to be hated by many users, it seems to be saner for modern devices. But i don't know how usable windows presents this for normal file storage. And it seems to depend on software i wouldn't suggest installing on windows... But still it's worth a thought, because it would work without unmounting anything. - Martin _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
