Add "PuzzleFS filesystem driver" user page

Signed-off-by: Ariel Miculas <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ariel-miculas

SUMMARY.md

@@ -25,6 +25,7 @@
   - [NVMe Driver](NVMe-driver.md)
   - [Null Block Driver](Null-Block-Driver.md)
   - [Android Binder Driver](Android-Binder-Driver.md)
+  - [PuzzleFS filesystem driver](PuzzleFS-filesystem-driver.md)
 
 # Links
 

src/PuzzleFS-filesystem-driver.md

@@ -0,0 +1,35 @@
+# PuzzleFS filesystem driver
+
+[PuzzleFS](https://github.com/project-machine/puzzlefs) is a container
+filesystem designed to address the limitations of the existing OCI format. The
+main goals of the project are reduced duplication, reproducible image builds,
+direct mounting support and memory safety guarantees, some inspired by the
+[OCIv2 design document](https://hackmd.io/@cyphar/ociv2-brainstorm).
+
+Reduced duplication is achieved using the content defined chunking algorithm
+FastCDC. This implementation allows chunks to be shared among layers. Building
+a new layer starting from an existing one allows reusing most of the chunks.
+
+Another goal of the project is reproducible image builds, which is achieved by
+defining a canonical representation of the image format. Direct mounting
+support is a key feature of puzzlefs and, together with fs-verity, it provides
+data integrity.
+
+Lastly, memory safety is critical to puzzlefs, leading to the decision to
+implement it in Rust. Another goal is to share the same code between user space
+and kernel space in order to provide one secure implementation.
+
+## Resources
+
+  - [PuzzleFS main repository](https://github.com/project-machine/puzzlefs)
+  - [PuzzleFS kernel branch](https://github.com/ariel-miculas/linux/tree/puzzlefs)
+  - [Issue tracking the development of the kernel driver](https://github.com/project-machine/puzzlefs/issues/78)
+  - [Talk at Open Source Summit Europe](https://osseu2023.sched.com/event/b98e711a56261b4a892b5fdcdc29ca73)
+  - [Kangrejos slides](https://kangrejos.com/2023/PuzzleFS.pdf)
+  - [LWN article](https://lwn.net/Articles/945320/)
+
+## Maintenance
+
+The PuzzleFS driver is maintained by Ariel Miculas. Contact him at
+[[email protected]](mailto:[email protected]) or through
+[Zulip](Contact.md#zulip-chat).