FAILED: Patch "btrfs: fix defrag not merging contiguous extents due to merged extent maps" failed to apply to v6.1-stable tree

[Sasha Levin]

The patch below does not apply to the v6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------