On Wed, Dec 21, 2016 at 12:03:17PM -0500, Jeff Layton wrote:

Only btrfs, ext4, and xfs implement it for data changes. Because of
this, these filesystems must log the inode to disk whenever the
i_version counter changes. That has a non-zero performance impact,
especially on write-heavy workloads, because we end up dirtying the
inode metadata on every write, not just when the times change. [1]

Do you have numbers to justify these changes?