> -----Original Message----- > From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Alan Stern > Sent: Thursday, October 27, 2011 9:05 AM > > On Thu, 27 Oct 2011, Barry Song wrote: > > > > Did you understand when I said that closing the backing file would > > > flush the page cache if the backing file is a device? > > > > that is not important. my point is we can just think this gadget as an > > user to vfs on target board, actually it is. > > so there is no any necessarity to do any fsync at all. > > > > when target board is disconnected from pc, pc has the duty to do the > > fsync to this gadget. > > And yet Windows doesn't seem to do this. Which means the gadget driver > has to take responsibility. I'm pretty sure Windows assumes that once a write to a removable device completes, the data is safe. Most Windows users don't bother to "safely eject" a thumb drive, they just yank it once the transfer is shown as complete. -- Paul > > after that, the board which this gadget works on > > takes the duty to do fsync. all should be done by generic OS way but > > not by gadget itself. > Yes, it should be done by the target's OS. I just sent a message to > the SCSI mailing list asking why this doesn't happen. > > Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
