On Sat, 6 Feb 2016, Oliver Neukum wrote: > > In theory, the copy command in Windows shouldn't need to wait either. > > But then you'd run into trouble if you unplugged the USB device without > > first clicking on the "Safely remove hardware" button -- which > > essentially does a sync. > > Well, not fully. Linux knows two modes. Full caching and totally > synchronous operations. It seems to me we could do better. > Like starting the write as soon as dirty blocks appear and do an > fsync upon close.
Even that wouldn't really do just what Marc would like. It would be nice to have a version of cp that would display a progress indicator, and every (say) 5% would do fdatasync. Plus, of course, fsync upon close. My point being that this doesn't require any changes to the kernel -- neither the filesystem layer nor the USB stack. It requires changes to the cp program. Or a new (maybe even graphical) version of cp. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
