md:Add support for Raid0->Raid5 takeover

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2a64cba9ea72..22c630b7ba6c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3017,6 +3017,20 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
                         mddev->to_remove = &md_redundancy_group;
         }
 
+        if (mddev->pers->sync_request == NULL &&
+            mddev->external) {
+                /* We are converting from a no-redundancy array
+                 * to a redundancy array and metadata is managed
+                 * externally so we need to be sure that writes
+                 * won't block due to a need to transition
+                 *      clean->dirty
+                 * until external management is started.
+                 */
+                mddev->in_sync = 0;
+                mddev->safemode_delay = 0;
+                mddev->safemode = 0;
+        }
+
         module_put(mddev->pers->owner);
         /* Invalidate devices that are now superfluous */
         list_for_each_entry(rdev, &mddev->disks, same_set)