[PATCH 34/71] xfs: support bmapping delalloc extents in the CoW fork

[Christoph Hellwig]

On Tue, Sep 06, 2016 at 09:34:13AM -0700, Darrick J. Wong wrote:
> While we're combining patches, I think it makes sense to modify
> _iomap_write_allocate so that when it's converting a data fork
> delalloc reservation into a real extent that it should look for an
> adjacent (file offset-wise) real extent in the CoW fork and feed that
> to the allocator in the hopes of allocating all the blocks in the same
> part of the disk.  Or better yet as one big(ger) extent record.

That would be nice.  Not sure it's worth doing that for the initial
submission, though.