Re: [PATCH 1/1] fs/mpage.c: forgotten WRITE_SYNC in case of data integrity write

Roman Peniaev
2014-03-14T14:23:47Z

On Fri, Mar 14, 2014 at 11:15 PM, Jan Kara <jack@suse.cz> 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 :)

--
Roman