Resync start/Finish actions

When a RESYNC_START message arrives, the node removes the entry
with the current slot number and adds the range to the
suspend_list.

Simlarly, when a RESYNC_FINISHED message is received, node clears
entry with respect to the bitmap number.

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

1 files changed, 46 insertions, 0 deletions

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 6428cc3ce38d..6b0dffebc90f 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -314,6 +314,50 @@ static void ack_bast(void *arg, int mode)
                 md_wakeup_thread(cinfo->recv_thread);
 }
 
+static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
+{
+        struct suspend_info *s, *tmp;
+
+        list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
+                if (slot == s->slot) {
+                        pr_info("%s:%d Deleting suspend_info: %d\n",
+                                        __func__, __LINE__, slot);
+                        list_del(&s->list);
+                        kfree(s);
+                        break;
+                }
+}
+
+static void remove_suspend_info(struct md_cluster_info *cinfo, int slot)
+{
+        spin_lock_irq(&cinfo->suspend_lock);
+        __remove_suspend_info(cinfo, slot);
+        spin_unlock_irq(&cinfo->suspend_lock);
+}
+
+
+static void process_suspend_info(struct md_cluster_info *cinfo,
+                int slot, sector_t lo, sector_t hi)
+{
+        struct suspend_info *s;
+
+        if (!hi) {
+                remove_suspend_info(cinfo, slot);
+                return;
+        }
+        s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
+        if (!s)
+                return;
+        s->slot = slot;
+        s->lo = lo;
+        s->hi = hi;
+        spin_lock_irq(&cinfo->suspend_lock);
+        /* Remove existing entry (if exists) before adding */
+        __remove_suspend_info(cinfo, slot);
+        list_add(&s->list, &cinfo->suspend_list);
+        spin_unlock_irq(&cinfo->suspend_lock);
+}
+
 static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
 {
         switch (msg->type) {
@@ -325,6 +369,8 @@ static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
         case RESYNCING:
                 pr_info("%s: %d Received message: RESYNCING from %d\n",
                         __func__, __LINE__, msg->slot);
+                process_suspend_info(mddev->cluster_info, msg->slot,
+                                msg->low, msg->high);
                 break;
         };
 }