On Tue, Dec 18, 2018 at 03:24:37PM -0800, Darrick J. Wong wrote: > On Mon, Dec 03, 2018 at 05:25:03PM -0500, Christoph Hellwig wrote: > Granted, I'm still rather fuzzy on what exactly is supposed to happen > with preallocating fallocate when all writes require an allocation to > succeed? For always_cow mode, perhaps we could consider preallocating into the COW fork rather than the data fork? That way when we go to write the data, we've already got the space allocated regardless of whether it is over a hole or existing data? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
