Hi,
please add commit 848c23b78fafdcd3270b ("btrfs: Remove false alert when
fiemap range is smaller than on-disk extent") to the 4.9.x stable tree.
It fixes a (harmless) warning but that's causing noise and false alerts,
we got a user report.
The warning was introduced by backport to v4.9.136 (commit id in stable
tree is 4b1cfa2e9db6168bcbcc). No other stable trees are affected.
The patch applies cleanly on 4.9.158.
Thanks.
