[PATCH v3 5/5] ext4: Defer mmap cmtime update until writeback

[Andy Lutomirski]

On Mon, Aug 19, 2013 at 7:38 PM, Dave Chinner <david at fromorbit.com> wrote:
> On Fri, Aug 16, 2013 at 04:22:12PM -0700, Andy Lutomirski wrote:
>> A fancier implementation could probably avoid an extra journal
>> transaction by adding a mapping_test_clear_cmtime call in
>> ext4_writepages, but this should already be a considerable
>> improvement -- we'll start one transaction per writepages call
>> instead of one per page.
>
> I'd like to see more than just an ext4 implementation - btrfs and
> XFS are the other main filesystems that should behave identically.

Will do.

>
> Also, it's worthwhile to write a generic xfstest to ensure that they
> all update the timestamp appropriately - if its' in xfstests, then
> we can basically guarantee that it won't get randomly regressed in
> future, and other filesystems can be easily verified as well sa
> their implement this.
>

Is there a guide to writing an xfstest?  I've already written it as a
standalone C program, so I assume it's easy.

--Andy