Re: Converting from one csum hash algorithm to another?

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On 2020/1/13 下午4:45, Sebastian Döring wrote:
> Hi there,
> 
> just a quick question: Will it be possible to convert existing btrfs
> to a different csum hash? It seems viable to re-read all
> data&metadata, verify existing checksums, and then recalculate a new
> one.

Yes, but consideration the complexity, it's not suitable for kernel i guess.

> 
> I'm pretty excited about the inclusion of xxhash and am wondering if I
> have to recreate the whole fs at some point...

Considering there is the use case, we may consider add such ability to
btrfs-progs.

Since we already have things like btrfstune -M to change UUID, we may be
able to do that.

Thanks,
Qu

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