xfstests xfs fuzzers fail with DAX

[Xiong Zhou]

Hi,

A few xfs fuzzers in xfstests fail with dax mount option, pass without dax.
They are xfs/086 xfs/088 xfs/089 xfs/091.

xfstests to commit 4470ad4c7e  (Jul 26)
kernel   to commit dd95069545  (Jul 24)

+ ./check xfs/091
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 rhel73 4.7.0+
MKFS_OPTIONS  -- -f -bsize=4096 /dev/pmem1
MOUNT_OPTIONS -- -o context=system_u:object_r:nfs_t:s0 /dev/pmem1 /daxsch

xfs/091	 104s
Ran: xfs/091
Passed all 1 tests

+ echo 'MOUNT_OPTIONS="-o dax"'
+ ./check xfs/091
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 rhel73 4.7.0+
MKFS_OPTIONS  -- -f -bsize=4096 /dev/pmem1
MOUNT_OPTIONS -- -o dax -o context=system_u:object_r:nfs_t:s0 /dev/pmem1 /daxsch

xfs/091 104s ...  - output mismatch (see /root/xfstests/results//xfs/091.out.bad)
    --- tests/xfs/091.out	2016-07-18 02:57:47.670000000 -0400
    +++ /root/xfstests/results//xfs/091.out.bad	2016-08-03 22:38:14.948000000 -0400
    @@ -6,6 +6,70 @@
     + corrupt image
     + mount image
     + modify files
    +pwrite64: Structure needs cleaning
    +pwrite64: Structure needs cleaning
    +pwrite64: Structure needs cleaning
    +pwrite64: Structure needs cleaning
    ...
    (Run 'diff -u tests/xfs/091.out /root/xfstests/results//xfs/091.out.bad'  to see the entire diff)
Ran: xfs/091
Failures: xfs/091
Failed 1 of 1 tests

# diff -u xfstests/tests/xfs/091.out /root/xfstests/results//xfs/091.out.bad
--- xfstests/tests/xfs/091.out	2016-07-18 02:57:47.670000000 -0400
+++ /root/xfstests/results//xfs/091.out.bad	2016-08-03 22:38:14.948000000 -0400
@@ -6,6 +6,70 @@
 + corrupt image
 + mount image
 + modify files
+pwrite64: Structure needs cleaning
<snip 62 more same lines>
+pwrite64: Structure needs cleaning
 + repair fs
 + mount image
 + chattr -R -i


Thanks,
Xiong