In NFS v4 and NLM, the lock length type is uint64_t. In many of our supported filesystems, lock length is defined as off_t or off64_t which are signed quantities.

The Windows NFS v3 client at least has demonstrated issuing a lock length of UINT64_MAX.

FSAL_GPFS returns an error if lock length is greater than LONG_MAX.

FSAL_GLUSTER and FSAL_VFS stuff the value into an off64_t, and then complains about lock length being less than zero.

I’m not sure about the other FSALs.

Returning an error ends up making Windows applications not work which is not ideal.

I think it might be best if inside the FSAL, we just quietly reduce lock length to a valid value, though I don’t know if that should be:

0 – indicating end of file

INT64_MAX – largest possible length

INT64_MAX – offset – so end of lock doesn’t exceed INT64_MAX

Does anyone have any thoughts?

Frank