Re: [Qemu-devel] [PATCH 0/3] usb-mtp: fix ObjectInfo request handling

[Bandan Das]

Daniel P. Berrangé <address@hidden> writes:

> On Tue, Apr 16, 2019 at 12:10:16PM -0400, Bandan Das wrote:
>> Daniel P. Berrangé <address@hidden> writes:
>> ...
>> >> > The store is read only by default. Are you trying something like:
>> >> >  -device usb-mtp,rootdir=/code/mtpshare,readonly=false ?
>> >> 
>> >> Ah ha, I didn't realize I had to enable write support explicitly. Will
>> >> retry with that.
>> >
>> > Even after setting  readonly=false, I still can't get "mtp-sendfile"
>> > to succeed in a guest.
>> >
>> I posted a patch for a bug introduced by a recent commit that made smaller
>> file sizes return back with a incomplete file transfer.
>> 
>> https://lists.gnu.org/archive/html/qemu-devel/2019-04/msg02552.html
>
> Yes, I applied that and didn't see any difference in behaviour
>

Just noticed the error message you posted:

    Error sending file.
    Error 2: PTP Layer error 02ff: send_file_object_info(): Could not send 
object info.
    Error 2: Error 02ff: PTP I/O Error
    ERROR: Could not close session!

I can't find usb-mtp sending a "I/O error" on an error condition
for the objectinfo phase. It might be libmtp or even the command itself
failing for some reason. For incomplete transfer, I just checked, it's
spitting out the error message correctly as INCOMPLETE_FILE_TRANSFER.

With libmtp version 1.13 on a FC24 guest, here's the output:

$ mtp-sendfile test.txt test.img
libmtp version: 1.1.13

Device 0 (VID=46f4 and PID=0004) is UNKNOWN in libmtp v1.1.13.
Please report this VID/PID and the device model to the libmtp development team
ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session, 
trying again after resetting USB interface
LIBMTP libusb: Attempt to reset device
Sending test.txt to test.img
type: txt, 44
Sending file...
Progress: 322 of 322 (100%)
New file ID: 7

What guest is this ? I can try to reproduce.

> Regards,
> Daniel