As of this kernel commit:
commit 73f34a5e2ced ("ext4: online defrag not supported with DAX")
online defrag operations for ext4 are disallowed when the filesystem is
mounted with the DAX option.
This causes several xfstests to fail because they expect the defrag
operation to change the file layout:
ext4/308 [failed, exit status 1] - output mismatch (see /root/xfstests/results//ext4/308.out.bad)
--- tests/ext4/308.out 2015-10-02 10:19:36.791795792 -0600
+++ /root/xfstests/results//ext4/308.out.bad 2016-02-17 16:20:52.330454602 -0700
@@ -23,659 +23,5 @@
50f924a5dc9b03609a4577f9f961414b SCRATCH_MNT/test.10
Perform compacting
50f924a5dc9b03609a4577f9f961414b SCRATCH_MNT/test.10
-Perform compacting, second pass
-50f924a5dc9b03609a4577f9f961414b SCRATCH_MNT/test.10
-Create file with 20 * 2 fragments
-wrote 1234/1234 bytes at offset 0
...
(Run 'diff -u tests/ext4/308.out /root/xfstests/results//ext4/308.out.bad' to see the entire diff)
generic/018 1s ... [failed, exit status 1] - output mismatch (see /root/xfstests/results//generic/018.out.bad)
--- tests/generic/018.out 2016-02-17 16:02:40.103656140 -0700
+++ /root/xfstests/results//generic/018.out.bad 2016-02-17 16:20:53.117459173 -0700
@@ -10,10 +10,6 @@
After: 1
Write backwards sync, but contiguous - should defrag to 1 extent
Before: in_range(5, 10)
-After: 1
-Write backwards sync leaving holes - defrag should do nothing
-Before: 16
-After: 16
...
(Run 'diff -u tests/generic/018.out /root/xfstests/results//generic/018.out.bad' to see the entire diff)
Avoid this by skipping over defrag tests if we are using ext4 + DAX.
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
common/defrag | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/common/defrag b/common/defrag
index d2b137e..1c970e2 100644
--- a/common/defrag
+++ b/common/defrag
@@ -27,7 +27,12 @@ _require_defrag()
DEFRAG_PROG="$XFS_FSR_PROG"
;;
ext4|ext4dev)
- DEFRAG_PROG="$E4DEFRAG_PROG"
+ echo $MOUNT_OPTIONS | grep -q dax
+ if [ $? -eq 0 ]; then
+ _notrun "defragmentation not supported with DAX"
+ else
+ DEFRAG_PROG="$E4DEFRAG_PROG"
+ fi
;;
btrfs)
DEFRAG_PROG="$BTRFS_UTIL_PROG filesystem defragment"
--
2.5.0
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