puzzlefs linux kernel module

[ariel-miculas]

This issue will track the necessary changes required to get puzzlefs into the linux kernel.

[ariel-miculas]

The following dependencies are required for implementing a puzzlefs kernel module:

• the serde crate and its dependencies https://github.com/Rust-for-Linux/linux/pull/1007/commits
• the filesystem abstractions for rust in the linux kernel: Support for filesystem abstractions Rust-for-Linux/linux#1004 and https://rust-for-linux.zulipchat.com/#narrow/stream/384413-Filesystems/topic/Filesystem.20abstractions
• serde_cbor integration into kernel, potentially with the alloc feature if it can be supported: https://rust-for-linux.zulipchat.com/#narrow/stream/291565-Help/topic/Missing.20parts.20of.20alloc
• this_error integration into the kernel

Licensing discussion:
https://rust-for-linux.zulipchat.com/#narrow/stream/291565-Help/topic/Missing.20parts.20of.20alloc
https://docs.kernel.org/process/license-rules.html

[ariel-miculas]

List of missing rust features in the kernel, needed by puzzlefs:

• a TryClone trait, use case: try_clone() a Vec
• a TryFromIterator together with a try_collect method, used extensively in puzzlefs and other crates such as hex.

[ariel-miculas]

First RFC patch series: https://lore.kernel.org/rust-for-linux/ZIO%[email protected]/T/#t
Github branch: Rust-for-Linux/linux@rust-next...ariel-miculas:puzzlefs_rfc_v1
Article in phoronix: https://www.phoronix.com/news/Experimental-Rust-PuzzleFS
Next steps towards upstreaming will be discussed with the Rust for Linux people on June 21st: https://rust-for-linux.zulipchat.com/#narrow/stream/384413-Filesystems/topic/Filesystem.20abstractions

[ariel-miculas]

v2 of the kernel driver: https://lore.kernel.org/all/[email protected]/
Github branch: https://github.com/ariel-miculas/linux/tree/puzzlefs_rfc_v2

[ariel-miculas]

There's a new version of the puzzlefs driver based on Wedson's read-only filesystem abstractions branch. @tych0 FYI.

[tych0]

Nice, thanks for the update. Is your plan to archive this repo at some point?

I'm still finagling some time to work on PuzzleFS at work. I'm hopeful that after the first of the year I'll be able to lend some hours to the effort!

[ariel-miculas]

No, there's no plan to archive this repo. You still need userspace tools to build puzzlefs images, what would be the reason to archive it?

[tych0]

Fair enough, I didn't know if those were going to live in tools/ or something as well. Thanks!

[ariel-miculas]

First we need to convince people it is upstream-worthy.

[tych0]

Of course :)

[ariel-miculas]

We now have a dedicated page under Rust for Linux.

[ariel-miculas]

The latest PuzzleFS patch series is here. There have been discussions about PuzzleFS in this email thread and #114.