[PATCH] common/rc: fix _xfs_is_realtime_file for internal rt devices

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Now that we can have internal realtime devices, it's possible to have a
realtime filesystem without setting USE_EXTERNAL=yes or SCRATCH_RTDEV.
Use the existing _xfs_has_feature helper to figure out if the given path
points to a filesystem with an online realtime volume.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
 common/xfs |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/common/xfs b/common/xfs
index ffdb82e6c970ba..8b1b87413659ad 100644
--- a/common/xfs
+++ b/common/xfs
@@ -253,9 +253,9 @@ _xfs_get_dir_blocksize()
 # Decide if this path is a file on the realtime device
 _xfs_is_realtime_file()
 {
-	if [ "$USE_EXTERNAL" != "yes" ] || [ -z "$SCRATCH_RTDEV" ]; then
-		return 1
-	fi
+	local mntpt="$(findmnt --target "$1" --noheadings --output TARGET)"
+
+	_xfs_has_feature $mntpt realtime || return 1
 	$XFS_IO_PROG -c 'stat -v' "$1" | grep -q -w realtime
 }