[PATCH v3 1/2] common/dmlogwrites: Update _require_log_writes_dax() for new dax option

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

1) Rename _require_log_writes_dax to _require_log_writes_dax_mountopt.
2) Make _require_log_writes_dax_mountopt check if old or new dax option
   is supported.
3) generic/470 takes use of _require_log_writes_dax_mountopt.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
---

V2->V3:
Update comments.

 common/dmlogwrites | 24 +++++++++++++++++++-----
 tests/generic/470  |  2 +-
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/common/dmlogwrites b/common/dmlogwrites
index 2a7ff612..573f4b8a 100644
--- a/common/dmlogwrites
+++ b/common/dmlogwrites
@@ -23,7 +23,18 @@ _require_log_writes()
 # explicitly. But this is considered as a temporary workaround, we want to move
 # all the DAX check back to _require_log_writes when dm-log-writes gains full
 # DAX support and remove this helper.
-_require_log_writes_dax()
+#
+# Check if dax mount options are supported
+# $1 can be either 'dax=always' or 'dax'
+# dax=always
+#      Check for the new dax options (dax=inode, dax=always or dax=never)
+#      by passing "dax=always".
+# dax
+#      Check for the old dax or new dax=always by passing "dax".
+# This only accepts 'dax=always' because dax=always, dax=inode and
+# dax=never are always supported together.  So if the other options are
+# required checking for 'dax=always' indicates support for the other 2.
+_require_log_writes_dax_mountopt()
 {
 	[ -z "$LOGWRITES_DEV" -o ! -b "$LOGWRITES_DEV" ] && \
 		_notrun "This test requires a valid \$LOGWRITES_DEV"
@@ -32,16 +43,19 @@ _require_log_writes_dax()
 	_require_test_program "log-writes/replay-log"
 
 	local ret=0
+	local mountopt=$1
+
 	_log_writes_init $SCRATCH_DEV
 	_log_writes_mkfs > /dev/null 2>&1
-	_log_writes_mount -o dax > /dev/null 2>&1
-	# Check options to be sure. XFS ignores dax option
+	_log_writes_mount "-o $mountopt" > /dev/null 2>&1
+	# Check options to be sure.
+	# XFS ignores dax option(or changes it to dax=never)
 	# and goes on if dev underneath does not support dax.
-	_fs_options $LOGWRITES_DMDEV | grep -qw "dax"
+	_fs_options $LOGWRITES_DMDEV | egrep -q "dax(=always|,|$)"
 	ret=$?
 	_log_writes_cleanup
 	if [ $ret -ne 0 ]; then
-		_notrun "$LOGWRITES_DMDEV $FSTYP does not support -o dax"
+		_notrun "$LOGWRITES_DMDEV $FSTYP does not support -o $mountopt"
 	fi
 }
 
diff --git a/tests/generic/470 b/tests/generic/470
index 93691f4a..fd6da563 100755
--- a/tests/generic/470
+++ b/tests/generic/470
@@ -35,7 +35,7 @@ rm -f $seqres.full
 _supported_fs generic
 _supported_os Linux
 _require_scratch
-_require_log_writes_dax
+_require_log_writes_dax_mountopt "dax"
 _require_xfs_io_command "mmap" "-S"
 _require_xfs_io_command "log_writes"
 
-- 
2.21.0