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#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>
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};
THEN("the mount has the correct filesystem, root dentry, mount dentry, and mount path")
{
REQUIRE(mount.get_filesystem() == fs);
REQUIRE(mount.get_root_dentry() == root_dentry);
REQUIRE(mount.get_mount_dentry() == root_dentry);
REQUIRE(mount.get_mount_path() == "/");
REQUIRE(mount.is_ready_to_unmount());
}
THEN("the mount has no parent mount")
{
REQUIRE(mount.get_parent_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}),
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};
mount.increment_ref_count();
REQUIRE(mount.get_ref_count() == 1);
REQUIRE_FALSE(mount.is_ready_to_unmount());
mount.increment_ref_count();
REQUIRE(mount.get_ref_count() == 2);
REQUIRE_FALSE(mount.is_ready_to_unmount());
REQUIRE(mount.decrement_ref_count());
REQUIRE(mount.get_ref_count() == 1);
REQUIRE_FALSE(mount.is_ready_to_unmount());
REQUIRE(mount.decrement_ref_count());
REQUIRE(mount.get_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};
REQUIRE_FALSE(mount.decrement_ref_count());
REQUIRE(mount.get_ref_count() == 0);
REQUIRE(mount.is_ready_to_unmount());
}
}
}
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