Input/Output error when renaming to existing file

Hello,
there is an Input/Output error when renaming a file to an existing one. Copy to overwrite an existing file works but not rename. This causes issues with synchronization software like rsync.

Steps to reproduce:
cd mounted_directory
touch pippo
touch pluto
mv pluto pippo
mv: cannot move 'pluto' to 'pippo': Input/output error
