I recently upgraded to FreeNAS 0.7.2 revision 6694 and suddenly symbolic links across zfs filesystems stopped working when accessed using Windows file sharing (CIFS/SMB). They still worked fine from the command line. Apparently the root cause is a security fix in Samba. To work around the change, add the following to “Auxiliary parameters” for CIFS/SMB in the FreeNAS web ui:
They will then be added to the global section of smb.conf. Select “Save and Restart” and the links should work again.