filesystems:btrfs-clean-unused-space
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Clean unused space in BTRFS with compression enabled
cat /dev/zero works for btrfs if you turn off compression first:
btrfs property set PATH compression none
For example:
mkdir -p btrfs-zero btrfs property set btrfs-zero compression none cat /dev/zero > btrfs-zero/zero ; rm btrfs-zero/zero
Credit: https://unix.stackexchange.com/questions/44725/clear-unused-space-with-zeros-btrfs
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