[PATCH] xfs: fail dax mount if reflink is enabled on a partition

Shiyang Ruan
2022-06-09T14:35:05Z

Failure notification is not supported on partitions. So, when we mount
a reflink enabled xfs on a partition with dax option, let it fail with
-EINVAL code.

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
fs/xfs/xfs_super.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 8495ef076ffc..a3c221841fa6 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -348,8 +348,10 @@ xfs_setup_dax_always(
goto disable_dax;
}

- if (xfs_has_reflink(mp)) {
- xfs_alert(mp, "DAX and reflink cannot be used together!");
+ if (xfs_has_reflink(mp) &&
+ bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
+ xfs_alert(mp,
+ "DAX and reflink cannot work with multi-partitions!");
return -EINVAL;
}

--
2.36.1