Re: [RFC PATCH 0/10] ftrfs: Fault-Tolerant Radiation-Robust Filesystem

Matthew Wilcox
2026-04-13T15:06:10Z

On Mon, Apr 13, 2026 at 04:23:46PM +0200, Aurelien DESBRIERES wrote:
> FTRFS was originally described in:
>
> Fuchs, C.M., Langer, M., Trinitis, C. (2015).
> FTRFS: A Fault-Tolerant Radiation-Robust Filesystem for Space Use.
> ARCS 2015, LNCS vol 9017, Springer.
> https://doi.org/10.1007/978-3-319-16086-3_8

Might be nice to link to a non-paywalled copy of that paper, eg:

https://www.cfuchs.net/chris/publication-list/ARCS2015/FTRFS.pdf

> This implementation is an independent open-source realization of the
> concepts described in that paper, developed for the Linux kernel.

Can I ask why? Is the original code not available or too ugly?

> On-disk layout:
>
> Block 0 : superblock (magic 0x46545246, CRC32-protected)
> Block 1..N : inode table (128 bytes/inode, CRC32 per inode)
> Block N+1..end : data blocks (CRC32 + RS FEC per block)
>
> Inodes use direct addressing (12 direct block pointers) plus single
> and double indirection. Directory entries are fixed-size (268 bytes)
> stored in direct blocks.

This is very old-school. That may be appropriate for the intended
use-case, but it ignores about five decades of filesystem research.