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Bcachefs: Better handling of checksum errors/bitrot

https://lore.kernel.org/linux-bcachefs/20250311201518.3573009-1-kent.overstreet@linux.dev/

by koverstreet • 1 year ago

9 3 1 year ago

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lore.kernel.org

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3

asdffdasy• 1 year ago

i am barely catching up to btrfs

yencabulator• 1 year ago

- - And, moving said extent requires giving it a new checksum [...]
- Extents need a poison bit: "reads return errors, even though it now has a good checksum" - this was added in a separate patch queued up for 6.15.

To me, it sounds like saving the old hash could be useful. That way a human can look at the now-corrupt extent, test flipping that one odd-looking bit, and confirm that the extent now matches the old hash.

So poison bit => failing_hash: Option<Hash>

koverstreet• 1 year ago

Or we could automate that at some point by storing small reed-solomon codes instead of checksums...

If ever get a fast implementation of rslib.c. Which is probably possible since pclmulqdq.

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