Merge branch 'develop-BA-FS26' into 'develop'HEADdevelop

Merge of BA-FS26 branch into develop

See merge request teachos/kernel!49

1 files changed, 94 insertions, 0 deletions

diff --git a/kernel/src/filesystem/mount.tests.cpp b/kernel/src/filesystem/mount.tests.cpp
new file mode 100644
index 0000000..c9ff82e
--- /dev/null
+++ b/kernel/src/filesystem/mount.tests.cpp
@@ -0,0 +1,94 @@
+#include <kernel/filesystem/mount.hpp>
+
+#include <kernel/filesystem/dentry.hpp>
+#include <kernel/test_support/cpu.hpp>
+#include <kernel/test_support/filesystem/filesystem.hpp>
+#include <kernel/test_support/filesystem/inode.hpp>
+
+#include <kstd/memory>
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <stdexcept>
+
+SCENARIO("Mount construction", "[filesystem][mount]")
+{
+  GIVEN("a filesystem and a root dentry")
+  {
+    auto fs = kstd::make_shared<kernel::tests::filesystem::filesystem>();
+    auto root_inode = kstd::make_shared<kernel::tests::filesystem::inode>();
+    auto root_dentry = kstd::make_shared<kernel::filesystem::dentry>(nullptr, root_inode, "/");
+
+    WHEN("constructing a mount with the filesystem and root dentry")
+    {
+      auto mount = kernel::filesystem::mount{root_dentry, root_dentry, fs, nullptr, nullptr};
+
+      THEN("the mount has the correct filesystem, root dentry, mount dentry, and mount path")
+      {
+        REQUIRE(mount.get_filesystem() == fs);
+        REQUIRE(mount.root_dentry() == root_dentry);
+        REQUIRE(mount.mount_dentry() == root_dentry);
+        REQUIRE(mount.mount_path() == "/");
+        REQUIRE(mount.is_ready_to_unmount());
+      }
+
+      THEN("the mount has no parent mount and no source mount")
+      {
+        REQUIRE(mount.parent_mount() == nullptr);
+        REQUIRE(mount.source_mount() == nullptr);
+      }
+    }
+
+    WHEN("constructing a mount with a null filesystem")
+    {
+      THEN("the constructor panics")
+      {
+        REQUIRE_THROWS_AS((kernel::filesystem::mount{root_dentry, root_dentry, nullptr, nullptr, nullptr}),
+                          kernel::tests::cpu::halt);
+      }
+    }
+  }
+}
+
+SCENARIO("Mount reference counting", "[filesystem][mount]")
+{
+  GIVEN("a filesystem and a root dentry")
+  {
+    auto fs = kstd::make_shared<kernel::tests::filesystem::filesystem>();
+    auto root_inode = kstd::make_shared<kernel::tests::filesystem::inode>();
+    auto root_dentry = kstd::make_shared<kernel::filesystem::dentry>(nullptr, root_inode, "/");
+
+    THEN("reference count can be incremented and decremented, the mount is ready to unmount when the reference "
+         "count == 0")
+    {
+      auto mount = kernel::filesystem::mount{root_dentry, root_dentry, fs, nullptr, nullptr};
+
+      mount.increment_ref_count();
+      REQUIRE(mount.ref_count() == 1);
+      REQUIRE_FALSE(mount.is_ready_to_unmount());
+
+      mount.increment_ref_count();
+      REQUIRE(mount.ref_count() == 2);
+      REQUIRE_FALSE(mount.is_ready_to_unmount());
+
+      mount.decrement_ref_count();
+      REQUIRE(mount.ref_count() == 1);
+      REQUIRE_FALSE(mount.is_ready_to_unmount());
+
+      mount.decrement_ref_count();
+      REQUIRE(mount.ref_count() == 0);
+      REQUIRE(mount.is_ready_to_unmount());
+    }
+
+    THEN("decrementing reference count when it is already zero does not decrement it below zero")
+    {
+      auto mount = kernel::filesystem::mount{root_dentry, root_dentry, fs, nullptr, nullptr};
+
+      REQUIRE_THROWS_AS(mount.decrement_ref_count(), std::runtime_error);
+      REQUIRE(mount.ref_count() == 0);
+      REQUIRE(mount.is_ready_to_unmount());
+    }
+  }
+}
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