From 29e78eb35bdd6d1a73357ec8bcf9f45645e33637 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 13 Jul 2026 14:17:50 +0200
Subject: kernel/vfs: simplify do_mount

---
 kernel/kernel/filesystem/vfs.cpp       | 34 ++++++++++++++++++++--------------
 kernel/kernel/filesystem/vfs.tests.cpp |  7 +++----
 2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/kernel/kernel/filesystem/vfs.cpp b/kernel/kernel/filesystem/vfs.cpp
index 56e164bd..45424ee2 100644
--- a/kernel/kernel/filesystem/vfs.cpp
+++ b/kernel/kernel/filesystem/vfs.cpp
@@ -118,22 +118,28 @@ namespace kernel::filesystem
       return std::unexpected{make_error_code(vfs_errc::invalid_path)};
     }
 
-    auto [mount_point_dentry, mount_context] = resolve_path_internal(target).value_or(std::pair{nullptr, nullptr});
-    if (mount_point_dentry && mount_context)
+    auto resolved_target = resolve_path_internal(target);
+    if (!resolved_target)
     {
-      auto [source_dentry, source_mount_context] = resolve_path_internal(source).value_or(std::pair{nullptr, nullptr});
-      if (source_dentry && source_mount_context)
-      {
-        if (auto fs = kernel::filesystem::filesystem::probe_and_mount(source_dentry->get_inode()))
-        {
-          do_mount_internal(mount_point_dentry, mount_context, *fs, source_mount_context);
-          return {};
-        }
-        return std::unexpected{make_error_code(vfs_errc::invalid_filesystem)};
-      }
-      return std::unexpected{make_error_code(vfs_errc::non_existent_path)};
+      return std::unexpected{resolved_target.error()};
     }
-    return std::unexpected{make_error_code(vfs_errc::mount_point_not_found)};
+    auto [mount_point_dentry, mount_context] = *resolved_target;
+
+    auto resolved_source = resolve_path_internal(source);
+    if (!resolved_source)
+    {
+      return std::unexpected{resolved_source.error()};
+    }
+    auto [source_dentry, source_mount_context] = *resolved_source;
+
+    auto fs = kernel::filesystem::filesystem::probe_and_mount(source_dentry->get_inode());
+    if (!fs)
+    {
+      return std::unexpected{fs.error()};
+    }
+
+    do_mount_internal(mount_point_dentry, mount_context, *fs, source_mount_context);
+    return {};
   }
 
   auto vfs::unmount(std::string_view path) -> std::expected<void, kstd::error_code>
diff --git a/kernel/kernel/filesystem/vfs.tests.cpp b/kernel/kernel/filesystem/vfs.tests.cpp
index 59589633..e4f042e7 100644
--- a/kernel/kernel/filesystem/vfs.tests.cpp
+++ b/kernel/kernel/filesystem/vfs.tests.cpp
@@ -256,15 +256,14 @@ SCENARIO_METHOD(kernel::tests::filesystem::storage_boot_module_vfs_fixture, "VFS
 
     THEN("mount with null file system fails")
     {
-      REQUIRE(vfs.do_mount("/closed.txt", "/information").error() ==
-              make_error_code(kernel::filesystem::vfs_errc::invalid_filesystem));
+      REQUIRE(vfs.do_mount("/closed.txt", "/information").error() == make_error_condition(kstd::errc::not_supported));
     }
 
     THEN("mount with invalid path fails")
     {
       REQUIRE(vfs.do_mount("/dev/ram16", "").error() == make_error_code(kernel::filesystem::vfs_errc::invalid_path));
       REQUIRE(vfs.do_mount("/dev/ram16", "information").error() ==
-              make_error_code(kernel::filesystem::vfs_errc::mount_point_not_found));
+              make_error_code(kernel::filesystem::vfs_errc::invalid_path));
     }
 
     THEN("mount with non-existent source path fails")
@@ -276,7 +275,7 @@ SCENARIO_METHOD(kernel::tests::filesystem::storage_boot_module_vfs_fixture, "VFS
     THEN("mount with non-existent mount point fails")
     {
       REQUIRE(vfs.do_mount("/dev/ram16", "/information/nonexistent").error() ==
-              make_error_code(kernel::filesystem::vfs_errc::mount_point_not_found));
+              make_error_code(kernel::filesystem::vfs_errc::non_existent_path));
     }
 
     THEN("unmount with invalid path fails")
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