[Qemu-devel] [PATCH 1/3] Replication: Ignore requests after failover

[Lukas Straub <lukasstraub2@web.de>]

After failover, the Secondary side of replication shouldn't change state.
Add the necessary checks to ignore requests after failover.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---
 block/replication.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/block/replication.c b/block/replication.c
index 3d4dedddfc..466d463963 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -454,6 +454,14 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
     aio_context_acquire(aio_context);
     s = bs->opaque;

+    if (s->stage == BLOCK_REPLICATION_DONE || s->stage == BLOCK_REPLICATION_FAILOVER) {
+        /* This case happens when a secondary is promoted to primary.
+         * Ignore the request because the secondary side of replication
+         * doesn't have to do anything anymore. */
+        aio_context_release(aio_context);
+        return;
+    }
+
     if (s->stage != BLOCK_REPLICATION_NONE) {
         error_setg(errp, "Block replication is running or done");
         aio_context_release(aio_context);
@@ -529,8 +537,7 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
                    "Block device is in use by internal backup job");

         top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL);
-        if (!top_bs || !bdrv_is_root_node(top_bs) ||
-            !check_top_bs(top_bs, bs)) {
+        if (!top_bs || !check_top_bs(top_bs, bs)) {
             error_setg(errp, "No top_bs or it is invalid");
             reopen_backing_file(bs, false, NULL);
             aio_context_release(aio_context);
@@ -577,6 +584,14 @@ static void replication_do_checkpoint(ReplicationState *rs, Error **errp)
     aio_context_acquire(aio_context);
     s = bs->opaque;

+    if (s->stage == BLOCK_REPLICATION_DONE || s->stage == BLOCK_REPLICATION_FAILOVER) {
+        /* This case happens when a secondary was promoted to primary.
+         * Ignore the request because the secondary side of replication
+         * doesn't have to do anything anymore. */
+        aio_context_release(aio_context);
+        return;
+    }
+
     if (s->mode == REPLICATION_MODE_SECONDARY) {
         secondary_do_checkpoint(s, errp);
     }
@@ -592,8 +607,8 @@ static void replication_get_error(ReplicationState *rs, Error **errp)
     aio_context = bdrv_get_aio_context(bs);
     aio_context_acquire(aio_context);
     s = bs->opaque;
-
-    if (s->stage != BLOCK_REPLICATION_RUNNING) {
+
+    if (s->stage == BLOCK_REPLICATION_NONE) {
         error_setg(errp, "Block replication is not running");
         aio_context_release(aio_context);
         return;
@@ -635,6 +650,14 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
     aio_context_acquire(aio_context);
     s = bs->opaque;

+    if (s->stage == BLOCK_REPLICATION_DONE || s->stage == BLOCK_REPLICATION_FAILOVER) {
+        /* This case happens when a secondary was promoted to primary.
+         * Ignore the request because the secondary side of replication
+         * doesn't have to do anything anymore. */
+        aio_context_release(aio_context);
+        return;
+    }
+
     if (s->stage != BLOCK_REPLICATION_RUNNING) {
         error_setg(errp, "Block replication is not running");
         aio_context_release(aio_context);
--
2.20.1