Method invalidate

switch/source/backupsize.cpp:77–87

}

void BackupSizeCache::invalidate(u64 id)
{
    std::lock_guard<std::mutex> lock(mMutex);
    mCache.erase(id);
    // If a compute for this id is in flight, tell it to discard its (now stale)
    // result so the next request recomputes against the current folders.
    if (mPending.count(id) != 0) {
        mDirty.insert(id);
    }
    mGeneration.fetch_add(1);
}

void BackupSizeCache::pause(void)
{