ChunkFS

Intro/Background

ChunkFS is about reducing the file system checking (fsck) time. ChunkFS is an idea that Arjan van de Ven and Val Henson came up with in order to avoid the fsck time increase linearly with the disk drive and the metadata on the disk drive increases.

See the reading list for more literature on ChunkFS.

Reading

• Val Henson. The 2006 Linux File System Workshop, 2006 http://lwn.net/Articles/190224/
• Val Henson, Arjan van de Ven, Amit Gud and Zach Brown. Chunkfs: Using divide-and-conquer to improve file system reliability and repair in USENIX Hot Topics in System Dependability, 2006 http://www.usenix.org/events/hotdep06/tech/prelim_papers/henson/henson.pdf

Source Code

ChunkFS git tree: git://git.kernel.org/pub/scm/linux/kernel/git/gud/chunkfs.git

ChunkFS FUSE git tree: git://git.kernel.org/pub/scm/linux/kernel/git/gud/fuse-chunkfs.git

ChunkFS tools: git://git.kernel.org/pub/scm/linux/kernel/git/gud/chunkfs-tools.git

ChunkFS How To

Compiling Tools and Making File System

1. Download tools from git://git.kernel.org/pub/scm/linux/kernel/git/gud/chunkfs-tools.git.
2. Compile it with ./configure and make.
3. Create a sparse file with:

4. Create chunkfs in the sparse file with 4 chunks as:

Compiling ChunkFS git tree

1. Download ChunkFS git tree from git://git.kernel.org/pub/scm/linux/kernel/git/gud/chunkfs.git.
2. Compile with CONFIG_CHUNKFS_FS set and CONFIG_BLK_DEV_LOOP to "y". NOTE: No xattrs and xips yet, CONFIG_EXT2_FS_XATTR and CONFIG_EXT2_FS_XIP should be "no" for clean compile.
3. Boot the compiled kernel and mount the newly created file system as:

4. Play around with it.

Announcement for the code can be found here: http://lwn.net/Articles/231482/

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