Btrfs: add support for fallocate's zero range operation
This implements support the zero range operation of fallocate. For now at least it's as simple as possible while reusing most of the existing fallocate and hole punching infrastructure. Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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