On 5 Oct 2018, at 16.42, Tom Sommer <mail@tomsommer.dk> wrote:

On 2018-10-05 11:50, Tom Sommer wrote:
On 2018-10-05 11:35, Timo Sirainen wrote:
On 4 Oct 2018, at 17.13, Tom Sommer <mail@tomsommer.dk> wrote:
On 2018-10-04 15:55, Timo Sirainen wrote:
On 4 Oct 2018, at 14.39, Tom Sommer <mail@tomsommer.dk> wrote:
Is this correct, and if so are there any plans to move dotlocks etc. to this directory?
What dotlocks? I guess mbox and Maildir have some locks that could be
moved there, but a better performance optimization for those
installations would be to switch to sdbox/mdbox. Other than that, I
don't remember there being anything important that could be moved
there.
Maildir locks yes, switching format is not a procedure I feel comfortable with :)
Would it be possible to move the maildir/mbox locks to VOLATILEDIR?
Sure it would be possible, but it's such a low priority for us that I
doubt we'll be implementing it.
Might try and look into it myself.

Something like this? See attached.<volatile-dotlock.patch>

Looks like it works. But could you:

1) Add it to github as merge request

2) MAILBOX_LIST_PATH_TYPE_VOLATILEDIR might be useful, but it's kind of a separate change of its own. To simplify, in Maildir code you could have box->list->set->volatile_dir != NULL ? box->list->set->volatile_dir : control_dir. That way it's falling back to control_dir like the previous code when VOLATILEDIR wasn't set.