This repository contains the code base for Wolves atop Optane DCPMM. Our paper "Fast and Synchronous Crash Consistency with Metadata Write-Once File System" is accepted by OSDI'25.
Our AE code is currently based on the HUNTER file system, wrapped with ENABLE_META_PACK(sb) if-branch. We are working on a new version of the code that will be more modular and easier to use (i.e., the wofs branch). The artifact evaluation steps can be obtained from our AE repository. We now introduce the code base and the branches corresponding to the paper.
Atop HUNTER file system, we mainly add or modify files below for Wolves.
-
tlalloc.c: Two-level allocator implementation. -
objm.c: PTL implementation, package allocation and reclamation (or soft-GC), and the metadata write-once scheme. -
balloc.c: Data block allocation/deallocation implementation. -
bbuild.c: Recovery routine from packages (including four phases).
The remaining files leverage packages and allocators to implement the basic file system operations.
| Branch | Description |
|---|---|
| osdi25 | Wolves without AVX or bandwidth regulation. |
| osdi25-meta-trace | Wolves with I/O timing breakdown. |
| osdi25-avx | Wolves with AVX accelerated I/O. |
| osdi25-fio-regulate | Wolves with FIO BW regulation. |
| osdi25-fb-regulate | Wolves with Filebench BW regulation. |
| osdi25-failure | Wolves with failure recovery. |
| osdi25-dr-recovery | Wolves with dump&restore recovery. |
| osdi25-dr-opt-recovery | Wolves with optimized dump&restore recovery. |
| osdi25-io-trace | Wolves with PM I/O trace. |
| osdi25-aging | Wolves under Agrawal aging profile. |
| wofs | A clean code version of Wolves. |
| osdi25-hunter-dac | HUNTER@DAC'23 file system with asynchronous write. |
| osdi25-hunter-async | HUNTER@TCAD'24 file system with soft update. |
| osdi25-hunter-sync | HUNTER@TCAD'24 file system with synchronous soft update. |
@inproceedings{pan2025fast,
title={Fast and Synchronous Crash Consistency with Metadata Write-Once File System},
author={Pan, Yanqi and Xia, Wen and Zhang, Yifeng and Zou, Xiangyu and Huang, Hao and Li, Zhenhua and Wu, Chentao},
booktitle={19th USENIX Symposium on Operating Systems Design and Implementation (OSDI 25)},
year={2025}
}