Avoid busy loop on rsync exit status 12 or 13.

Although we set the next snapshot time to now + 60 seconds in case
rsync exits with exit status 12 or 13, we miss to check this time
barrier in case the snapshot creation status is HS_NEEDS_RESTART.

Fix this by adding an additional check in the switch() statement
of the select loop. As this change would trigger the assertion

	snapshot_creation_status == HS_READY

in next_snapshot_is_due(), remove this assertion.

diff --git a/dss.c b/dss.c
index 9589f9dd38a18c756419e55c5f62c044aa9be2cf..0a2f55b9fb02035405c791e2343398eeacb78d44 100644 (file)
--- a/dss.c
+++ b/dss.c
@@ -197,7 +197,6 @@ static int next_snapshot_is_due(void)
 {
        int64_t now = get_current_time();
 
-       assert(snapshot_creation_status == HS_READY);
        if (!next_snapshot_time_is_valid())
                next_snapshot_time = compute_next_snapshot_time();
        if (next_snapshot_time <= now) {
@@ -1124,6 +1123,8 @@ static int select_loop(void)
                        create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
                        /* fall through */
                case HS_NEEDS_RESTART:
+                       if (!next_snapshot_is_due())
+                               continue;
                        ret = create_snapshot(rsync_argv);
                        if (ret < 0)
                                goto out;