two failing xfstests using xfs (no DAX)

[Ross Zwisler]

On Fri, Oct 02, 2015 at 11:49:41AM -0600, Ross Zwisler wrote:
> Recently I've been trying to get a stable baseline for my DAX testing using
> various filesystems, and in doing so I noticed a pair of tests that were
> behaving badly when run on XFS without DAX.  These test failures happen in
> both v4.2 and v4.3-rc3, though the signatures may vary a bit.
> 
> My testing setup is a kvm virtual machine with 8 GiB of its 16GiB of memory
> reserved for PMEM using the mmap parameter (memmap=8G!8G) and with the
> CONFIG_X86_PMEM_LEGACY config option enabled.  I've attached my full kernel
> config to this mail.

Sorry, one more detail - I have my test setup so that both my scratch device
and my test device are partitions on my PMEM ramdisk.

export TEST_DEV=/dev/pmem0p1
export TEST_DIR=/mnt/xfstests_test
export SCRATCH_DEV=/dev/pmem0p2
export SCRATCH_MNT=/mnt/xfstests_scratch

function xfstests_init {
        parted -s $xfstests_dev mktable msdos
        parted -s -a optimal $xfstests_dev mkpart Primary 1 4GiB
        parted -s -a optimal $xfstests_dev mkpart Primary 4GiB 7GiB

        if [[ $test_fs == "xfs" ]]; then
                mkfs.xfs -f $TEST_DEV
                mkfs.xfs -f $SCRATCH_DEV
        elif [[ $test_fs == "ext4" ]]; then
                mkfs.ext4 -F $TEST_DEV
                mkfs.ext4 -F $SCRATCH_DEV
        elif [[ $test_fs == "ext2" ]]; then
                mkfs.ext2 -F $TEST_DEV
                mkfs.ext2 -F $SCRATCH_DEV
        else
                echo "Invalid test fs '$test_fs'"
        fi
}