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

[Jan Kara]

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?

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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