intent-logging, not synchronizing written blocks?

Hi,

Is intent-logging for raid5 already in mainline or only in -mm? I
looked for it in 2.6.14 and found nothing...

It seems that intent-logging accelerates synchronization by skipping
the blocks that have not changed since the array went out of sync. I'm
not sure but if this is correct I thought that another way to speed
re-sync would be to not sync the blocks that were written to the array
after it started, since they should be already up to date. Is there a
way to do this? Does intent-logging takes this into account?