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https://github.com/openzfs/zfs/issues/15526#issuecomment-181...
> zpool get all tank | grep bclone
> kc3000 bcloneused 442M
> kc3000 bclonesaved 1.42G
> kc3000 bcloneratio 4.30x
> My understanding is this: If the result is 0 for both bcloneused and bclonesaved then it's safe to say that you don't have silent corruption.
> But I recall reading elsewhere a discussion about some userspace program which did depend on holes being present in the filesystem as actual holes (visible to SEEK_HOLE and so on) and not as runs of zeros.
> treatment of on-disk segments as "what was written by programs" can cause areas of 0 to not be written by bmaptool copy
https://github.com/intel/bmap-tools/issues/75
IMO, the issue here isn't filesystem or zfs behavior, it's that bmap-tool wants an extra "don't care bit" per block, which filesystems (traditionally) don't track, and programs interacting with filesystem don't expect to exist.
Some of the comments I've made in this issue describe options to make things better.
I'm keeping an eye on it but it's not there yet e.g. https://github.com/koverstreet/bcachefs/issues/619#issuecomm...