1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 7ba7b3900cb8..65241f32d3f8 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -313,6 +313,11 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
         struct btrfs_device *tgt_device = NULL;
         struct btrfs_device *src_device = NULL;
 
+        if (btrfs_fs_incompat(fs_info, RAID56)) {
+                pr_warn("btrfs: dev_replace cannot yet handle RAID5/RAID6\n");
+                return -EINVAL;
+        }
+
         switch (args->start.cont_reading_from_srcdev_mode) {
         case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
         case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: