Gather on-going resync information of other nodes

When a node joins, it does not know of other nodes performing resync.
So, each node keeps the resync information in it's LVB. When a new
node joins, it reads the LVB of each "online" bitmap.

[TODO] The new node attempts to get the PW lock on other bitmap, if
it is successful, it reads the bitmap and performs the resync (if
required) on it's behalf.

If the node does not get the PW, it requests CR and reads the LVB
for the resync information.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8f310d98f082..71f655015385 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7626,6 +7626,9 @@ void md_do_sync(struct md_thread *thread)
         md_new_event(mddev);
         update_time = jiffies;
 
+        if (mddev_is_clustered(mddev))
+                md_cluster_ops->resync_info_update(mddev, j, max_sectors);
+
         blk_start_plug(&plug);
         while (j < max_sectors) {
                 sector_t sectors;
@@ -7686,6 +7689,8 @@ void md_do_sync(struct md_thread *thread)
                 j += sectors;
                 if (j > 2)
                         mddev->curr_resync = j;
+                if (mddev_is_clustered(mddev))
+                        md_cluster_ops->resync_info_update(mddev, j, max_sectors);
                 mddev->curr_mark_cnt = io_sectors;
                 if (last_check == 0)
                         /* this is the earliest that rebuild will be
@@ -7746,6 +7751,9 @@ void md_do_sync(struct md_thread *thread)
         /* tell personality that we are finished */
         mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
 
+        if (mddev_is_clustered(mddev))
+                md_cluster_ops->resync_info_update(mddev, 0, 0);
+
         if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
             mddev->curr_resync > 2) {
                 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {