md:Add support for Raid0->Raid5 takeover
Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2a64cba..22c630b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3017,6 +3017,20 @@
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)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 10af371..bb28fd6 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -52,6 +52,7 @@
#include <linux/cpu.h>
#include "md.h"
#include "raid5.h"
+#include "raid0.h"
#include "bitmap.h"
/*
@@ -5619,6 +5620,21 @@
}
+static void *raid5_takeover_raid0(mddev_t *mddev)
+{
+
+ mddev->new_level = 5;
+ mddev->new_layout = ALGORITHM_PARITY_N;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
+ mddev->raid_disks += 1;
+ mddev->delta_disks = 1;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ return setup_conf(mddev);
+}
+
+
static void *raid5_takeover_raid1(mddev_t *mddev)
{
int chunksect;
@@ -5748,6 +5764,16 @@
* raid4 - trivial - just use a raid4 layout.
* raid6 - Providing it is a *_6 layout
*/
+ if (mddev->level == 0) {
+ /* for raid0 takeover only one zone is supported */
+ struct raid0_private_data *raid0_priv
+ = mddev->private;
+ if (raid0_priv->nr_strip_zones > 1) {
+ printk(KERN_ERR "md: cannot takeover raid 0 with more than one zone.\n");
+ return ERR_PTR(-EINVAL);
+ }
+ return raid5_takeover_raid0(mddev);
+ }
if (mddev->level == 1)
return raid5_takeover_raid1(mddev);