[PATCH 1/3] libxfs: don't set mp->m_rtdev_targp when no RT devices is provided

[Christoph Hellwig <hch@lst.de>]

The user-space only parts of commit 9840f7e09e2f ("xfs: allow internal
RT devices for zoned mode") accidentally set m_rtdev_targp to
m_ddev_targp when not name is set for the RT device, and thus disable
the check for a non-NULL m_rtdev_targp in rtmount_init.

This lead to tools working without specifying a RT device when they
should abort.  For example this can lead to repair trying to read
and rewrite the rtsb when called without -rc, which will then fail
in weird ways.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 libxfs/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libxfs/init.c b/libxfs/init.c
index 5d8b4a153e28..2a46ddf086ed 100644
--- a/libxfs/init.c
+++ b/libxfs/init.c
@@ -573,7 +573,7 @@ libxfs_buftarg_init(
 	else
 		mp->m_logdev_targp = libxfs_buftarg_alloc(mp, xi, &xi->log,
 				lfail);
-	if (!xi->rt.dev || xi->rt.dev == xi->data.dev)
+	if (xi->rt.dev == xi->data.dev)
 		mp->m_rtdev_targp = mp->m_ddev_targp;
 	else
 		mp->m_rtdev_targp = libxfs_buftarg_alloc(mp, xi, &xi->rt,
-- 
2.53.0