samba 3.0.24 on (gentoo)linux/alpha is reporting wrong sizes of used and available space to clients, confirmed on linux and windows. results on linux differ with smbfs and cifs filesystem driver.
problem persists since 2 samba minor version updates. i tried compiling with different parameters and different gcc versions. always same results. samba built with same paramters and same gcc version on x86 works correctly.
i don't think this is a problem with current samba versions. If you still see this problem with Samba 4.1.x, please reopen this bug and explain how to reproduce the problem that you see.