common/xfs: verify xfs_io supports statx atomic write attributes

xfs_io atomic write support is a dependency of the scsi and nvme atomic
write tests. The xfs_io atomic write support was introduced across
different versions so if xfs_io pwrite supports the -A (Atomic Write)
option, it doesn't necessarily support statx atomic write fields so that
needs to be verified separately.

Link: #161
Signed-off-by: Alan Adamson <[email protected]>
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: alanpeterad

common/xfs

@@ -11,6 +11,14 @@ _have_xfs_io_atomic_write() {
 
 	_have_program xfs_io || return $?
 
+	# Determine if the statx command returns the atomic writes fields.
+	s=$(xfs_io -c "statx -r -m 0x00010000" /dev/null | grep atomic_write_unit_min)
+	if [[ $s == "" ]];
+	then
+		SKIP_REASONS+=("xfs_io does not support the statx atomic write fields")
+		return 1
+	fi
+
 	# If the pwrite command supports the -A option then this version
 	# of xfs_io supports atomic writes.
 	s=$(xfs_io -c help | grep pwrite | awk '{ print $4}')