On Sun, Jul 18, 2021 at 08:54:48PM +0800, Qu Wenruo wrote:

Linux VFS doesn't allow directory to have hard links, thus for btrfs
on-disk directory inode items, their nlinks should never go beyond 1.

Lowmem mode already has the check and will report it without problem.
Only original mode needs this update.

Reported-by: Pepperpoint <redacted>
Link: https://lore.kernel.org/linux-btrfs/162648632340.7.1932907459648384384.10178178@mb.ardentcoding.com/ (local)
Signed-off-by: Qu Wenruo <redacted>

Added to devel, thanks.