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Re: [dm-devel] [PATCH 29 of 30] DM Snapshot: utilize snapshare


Do not use 'ss' after it has been used as a list iterator. Besides, each snapshare needs to have its associated table notified of the event.

Will send replacement patch shortly.

Bug was caught by QA department's snapshot tests - specifically, overfilling the snapshot.


On Mar 19, 2009, at 4:37 PM, Jonathan Brassow wrote:

static void __invalidate_snapshot(struct dm_snapshot *s, int err)
+	struct dm_snapshare *ss;
	char *tmp_str = "ES_INVALIDATE";

	if (!s->valid)
@@ -734,12 +823,15 @@ static void __invalidate_snapshot(struct
	else if (err == -ENOMEM)
		DMERR("Invalidating snapshot: Unable to allocate exception.");

-	if (s->store->type->message)
-		s->store->type->message(s->store, 1, &tmp_str);
+	/* Invalidating the snapshot will invalidate all snapshares. */
+	list_for_each_entry(ss, &s->shared_list, shared_list)
+		if (ss->store->type->message)
+			ss->store->type->message(ss->store, 1, &tmp_str);

	s->valid = 0;

-	dm_table_event(s->store->ti->table);
+	dm_table_event(ss->store->ti->table);

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