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SubjectRe: [patch 0/6][RFC] Cleanup FIBMAP

> The second use case is to look at the physical layout of blocks on disk
> for a specific file, use Mark Lord's write_long patches to inject a disk
> error and then read that file to make sure that we are handling disk IO
> errors correctly. A bit obscure, but really quite useful.

Hmm, yeah, that's interesting.

> We have also used FIBMAP a few times to try and map an observed IO error
> back to a file. Really slow and painful to do, but should work on any
> file system when a better method is not supported.

We're getting off of this FIBMAP topic, but this interests me. Can we
explore this a little? How did you find out about the error without
having a file to associate with it? Drive scrubbing, or some such?

- z
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