Re: [ANNOUNCE] DAXFS: A zero-copy, dmabuf-friendly filesystem for shared memory

Matthew Wilcox
2026-01-26T19:16:51Z

On Mon, Jan 26, 2026 at 09:38:23AM -0800, Cong Wang wrote:
> If you are interested in adding multikernel support to EROFS, here is
> the codebase you could start with:
> https://github.com/multikernel/linux. PR is always welcome.

I think the onus is rather the other way around. Adding a new filesystem
to Linux has a high bar to clear because it becomes a maintenance burden
to the rest of us. Convince us that what you're doing here *can't*
be done better by modifying erofs.

Before I saw the email from Gao Xiang, I was also going to suggest that
using erofs would be a better idea than supporting your own filesystem.
Writing a new filesystem is a lot of fun. Supporting a new filesystem
and making it production-quality is a whole lot of pain. It's much
better if you can leverage other people's work. That's why DAX is a
support layer for filesystems rather than its own filesystem.