Online defragmentation is not supported on DAX-enabled filesystems
because DAX bypasses the page cache required for defrag operations.

Add check in _require_defrag() to skip tests when DAX is enabled,
avoiding false failures on ext4/301-304, ext4/308 and generic/018.

Signed-off-by: Disha Goel <disgoel@linux.ibm.com>
---
 common/defrag | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/defrag b/common/defrag
index 055d0d0e..28db2f7a 100644
--- a/common/defrag
+++ b/common/defrag
@@ -6,6 +6,10 @@
 
 _require_defrag()
 {
+    # Defragmentation is not supported on DAX-enabled filesystems
+    if echo "$MOUNT_OPTIONS" | grep -qw "dax"; then
+        _notrun "Defragmentation not supported on DAX-enabled filesystem"
+    fi
     case "$FSTYP" in
     xfs)
         # xfs_fsr does preallocates, require "falloc"
-- 
2.45.1