[PATCH v5 4/5] replication: Assert that children are writable

[Lukas Straub <lukasstraub2@web.de>]

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Assert that the children are writable where it's needed.
While there is no test-case for the
BLOCK_REPLICATION_FAILOVER_FAILED state, this at least ensures that
s->secondary_disk is always writable in case replication might go
into that state.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---
 block/replication.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/block/replication.c b/block/replication.c
index b74192f795..772bb63374 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -261,6 +261,13 @@ static coroutine_fn int replication_co_writev(BlockDriverState *bs,
     int64_t n;

     assert(!flags);
+    assert(top->perm & BLK_PERM_WRITE);
+    if (s->mode == REPLICATION_MODE_SECONDARY &&
+        s->stage != BLOCK_REPLICATION_NONE &&
+        s->stage != BLOCK_REPLICATION_DONE) {
+        assert(base->perm & BLK_PERM_WRITE);
+    }
+
     ret = replication_get_io_status(s);
     if (ret < 0) {
         goto out;
@@ -318,6 +325,9 @@ static void secondary_do_checkpoint(BlockDriverState *bs, Error **errp)
     Error *local_err = NULL;
     int ret;

+    assert(active_disk->perm & BLK_PERM_WRITE);
+    assert(s->hidden_disk->perm & BLK_PERM_WRITE);
+
     if (!s->backup_job) {
         error_setg(errp, "Backup job was cancelled unexpectedly");
         return;
--
2.20.1


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