Is “tmpdir support” feature on the way?

[fpemud]

From bcachefs roadmap:

tmpdir support
Add a directory option for using it as a tmpdir - the contents will be deleted on every mount.
Since the contents won't be needed after an unclean shutdown, there's no need for fsync() to do anything - this option will also turn > fsync() into a noop, and without the fsync buffered IO will only be flushed on memory reclaim - meaning, tmpdir directories should perform just as well as a tmpfs.

This is a very appealing feature.
With it, we could eliminate the need for the size= parameter when mounting tmpfs and effectively have an unlimited-size tmpfs backed by disk.
The size limit of tmpfs has always been an annoyance.

Is this feature currently under development? I'm very keen on this functionality and would be happy to help test patches if needed.

[koverstreet]

Right now, all I'm thinking about is making sure everything is squared away for taking off the experimental label. Hoping to block out a week or so with zero distractions to do nothing but work on the user manual.

After that, and new users showing up with new bug reports... maybe