POSIX file system test suite

A few weeks back a POSIX file system test suite was announced on linux-fsdevel. Some 1700 tests of return values, error codes, and side effects for things like unlink, chmod, and so forth. The suite turned up a number of minor bugs in the MDS and client (mostly relating to things like legal file modes), and what appears to be a VFS bug with rename (affecting only a few filesystems, Ceph included). The Ceph kernel client now passes all but a handful of tests. Yay!

Which ones doesn’t it pass, you ask? They’re all like this:

expect 0 create ${n0} 0644 ctime1=`${fstest} stat ${n0} ctime` sleep 1 expect 0 -- chown ${n0} -1 -1 ctime2=`${fstest} stat ${n0} ctime` case "${os}:${fs}" in Linux:ext3) test_check $ctime1 -lt $ctime2 ;; *) test_check $ctime1 -eq $ctime2 ;; esac

Sorry, chown(file, -1, -1) shouldn’t update ctime, even if ext3 disagrees.