ams_mitm: Implement emummc Nintendo folder redirection

stratosphere/libstratosphere/source/fssrv/fssrv_storage_interface_adapter.cpp

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include <stratosphere/fssrv/fssrv_interface_adapters.hpp>
+
+namespace ams::fssrv::impl {
+
+    StorageInterfaceAdapter::StorageInterfaceAdapter(fs::IStorage *storage) : base_storage(storage) {
+        /* ... */
+    }
+
+    StorageInterfaceAdapter::StorageInterfaceAdapter(std::unique_ptr<fs::IStorage> storage) : base_storage(storage.release()) {
+        /* ... */
+    }
+
+    StorageInterfaceAdapter::StorageInterfaceAdapter(std::shared_ptr<fs::IStorage> &&storage) : base_storage(std::move(storage)) {
+        /* ... */
+    }
+
+    StorageInterfaceAdapter::~StorageInterfaceAdapter() {
+        /* ... */
+    }
+
+    std::optional<std::shared_lock<os::ReadWriteLock>> StorageInterfaceAdapter::AcquireCacheInvalidationReadLock() {
+        std::optional<std::shared_lock<os::ReadWriteLock>> lock;
+        if (this->deep_retry_enabled) {
+            lock.emplace(this->invalidation_lock);
+        }
+        return lock;
+    }
+
+    Result StorageInterfaceAdapter::Read(s64 offset, const ams::sf::OutNonSecureBuffer &buffer, s64 size) {
+        /* TODO: N retries on ResultDataCorrupted, we may want to eventually. */
+        /* TODO: Deep retry */
+        R_UNLESS(offset >= 0, fs::ResultInvalidOffset());
+        R_UNLESS(size >= 0,   fs::ResultInvalidSize());
+        return this->base_storage->Read(offset, buffer.GetPointer(), size);
+    }
+
+    Result StorageInterfaceAdapter::Write(s64 offset, const ams::sf::InNonSecureBuffer &buffer, s64 size)  {
+        /* TODO: N increases thread priority temporarily when writing. We may want to eventually. */
+        R_UNLESS(offset >= 0, fs::ResultInvalidOffset());
+        R_UNLESS(size >= 0,   fs::ResultInvalidSize());
+
+        auto read_lock = this->AcquireCacheInvalidationReadLock();
+        return this->base_storage->Write(offset, buffer.GetPointer(), size);
+    }
+
+    Result StorageInterfaceAdapter::Flush()  {
+        auto read_lock = this->AcquireCacheInvalidationReadLock();
+        return this->base_storage->Flush();
+    }
+
+    Result StorageInterfaceAdapter::SetSize(s64 size)  {
+        R_UNLESS(size >= 0, fs::ResultInvalidSize());
+        auto read_lock = this->AcquireCacheInvalidationReadLock();
+        return this->base_storage->SetSize(size);
+    }
+
+    Result StorageInterfaceAdapter::GetSize(ams::sf::Out<s64> out)  {
+        auto read_lock = this->AcquireCacheInvalidationReadLock();
+        return this->base_storage->GetSize(out.GetPointer());
+    }
+
+    Result StorageInterfaceAdapter::OperateRange(ams::sf::Out<fs::StorageQueryRangeInfo> out, s32 op_id, s64 offset, s64 size) {
+        /* N includes this redundant check, so we will too. */
+        R_UNLESS(out.GetPointer() != nullptr, fs::ResultNullptrArgument());
+
+        out->Clear();
+        if (op_id == static_cast<s32>(fs::OperationId::QueryRange)) {
+            auto read_lock = this->AcquireCacheInvalidationReadLock();
+
+            fs::StorageQueryRangeInfo info;
+            R_TRY(this->base_storage->OperateRange(&info, sizeof(info), fs::OperationId::QueryRange, offset, size, nullptr, 0));
+            out->Merge(info);
+        }
+
+        return ResultSuccess();
+    }
+
+}