On Fri 14-03-14 23:23:45, Roman Peniaev wrote: > On Fri, Mar 14, 2014 at 11:15 PM, Jan Kara <jack@xxxxxxx> wrote: > > On Fri 14-03-14 10:11:43, Tejun Heo wrote: > >> > Also, could you please help me do understand how can I guarantee > >> > integrity in case of block device with big volatile > >> > cache and filesystem, which does not support REQ_FLUSH/FUA? > >> > >> If a device has a volatile cache but doesn't support flush, it can't > >> guarantee integrity. There's no way for its user to determine or > >> force whether certain data is on non-volatile media. It's an > >> inherently broken device. > > I think his problem was that the device does support REQ_FLUSH/FUA but > > the filesystem on top of it doesn't issue it properly. That's a filesystem > > problem so fix the filesystem... :) Which one is it? > > take any old school, e.g. ext2 or even better: fat :) Well, for ext2, you can use ext4 kernel driver which takes care of REQ_FLUSH properly. For fat, you'll need to fix the fs... Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
