#include "fs/StorageCache.h"
#include "Log.h"
#include <luna/ScopeGuard.h>

static LinkedList<StorageCache> g_storage_caches;

Result<StorageCache::CacheEntry*> StorageCache::fetch_entry(u64 block)
{
    {
        CacheEntry* entry = m_cache_entries.try_get_ref(block);
        if (entry && !entry->buffer.is_empty()) return entry;
    }

    CacheEntry entry {};
    TRY(m_cache_entries.try_set(block, move(entry)));

#ifdef CACHE_DEBUG
    kdbgln("cache: Created new cache entry for block %lu", block);
#endif

    return m_cache_entries.try_get_ref(block);
}

void StorageCache::clear()
{
    ScopedKMutexLock<100> lock(m_mutex);

    m_cache_entries.clear();
}

StorageCache::StorageCache()
{
    g_storage_caches.append(this);
}

StorageCache::~StorageCache()
{
    g_storage_caches.remove(this);
}

void StorageCache::clear_caches()
{
    for (auto* cache : g_storage_caches) { cache->clear(); }
}