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Use zfs opportunistic block cloning (like cp --reflink=auto) #279

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kc9jud opened this issue Nov 1, 2024 · 0 comments
Open

Use zfs opportunistic block cloning (like cp --reflink=auto) #279

kc9jud opened this issue Nov 1, 2024 · 0 comments

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@kc9jud
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kc9jud commented Nov 1, 2024

For various technical reasons, it is not possible to reflink between different ZFS datasets. However, instead of calling ioctl(FICLONE) one can call copy_file_range() which ZFS will try to handle with block cloning, but not always. It might be useful to have fclones dedupe mimic the behavior of coreutils>=9.1 which tries ioctl(FICLONE) and then falls back to copy_file_range(), at least if the files are on a ZFS dataset.
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