md-cluster: remove capabilities

This adds "remove" capabilities for the clustered environment.
When a user initiates removal of a device from the array, a
REMOVE message with disk number in the array is sent to all
the nodes which kick the respective device in their own array.

This facilitates the removal of failed devices.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index d406a79f9140..ca011d1d1de7 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2477,8 +2477,10 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
                 else {
                         struct mddev *mddev = rdev->mddev;
                         if (mddev_is_clustered(mddev))
-                                md_cluster_ops->metadata_update_start(mddev);
+                                md_cluster_ops->remove_disk(mddev, rdev);
                         md_kick_rdev_from_array(rdev);
+                        if (mddev_is_clustered(mddev))
+                                md_cluster_ops->metadata_update_start(mddev);
                         if (mddev->pers)
                                 md_update_sb(mddev, 1);
                         md_new_event(mddev);
@@ -5968,6 +5970,9 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
         if (rdev->raid_disk >= 0)
                 goto busy;
 
+        if (mddev_is_clustered(mddev))
+                md_cluster_ops->remove_disk(mddev, rdev);
+
         md_kick_rdev_from_array(rdev);
         md_update_sb(mddev, 1);
         md_new_event(mddev);