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-rw-r--r--kernel/kernel/filesystems/fat32/filesystem.cpp63
-rw-r--r--kernel/kernel/filesystems/fat32/filesystem.tests.cpp44
2 files changed, 46 insertions, 61 deletions
diff --git a/kernel/kernel/filesystems/fat32/filesystem.cpp b/kernel/kernel/filesystems/fat32/filesystem.cpp
index 63058e54..c423a2fc 100644
--- a/kernel/kernel/filesystems/fat32/filesystem.cpp
+++ b/kernel/kernel/filesystems/fat32/filesystem.cpp
@@ -14,13 +14,16 @@
#include <kstd/memory.hpp>
#include <kstd/mutex.hpp>
+#include <kstd/print.hpp>
#include <kstd/result.hpp>
#include <kstd/span.hpp>
#include <kstd/system_error.hpp>
#include <kstd/units.hpp>
#include <algorithm>
+#include <array>
#include <bit>
+#include <cstddef>
#include <cstdint>
#include <optional>
#include <string_view>
@@ -32,6 +35,48 @@ namespace kernel::filesystems::fat32
//! Hidden implementation details.
namespace
{
+ //! Convert a fixed size, space padded character array of the boot sector into a string view.
+ //!
+ //! @param array The array to convert.
+ //! @return A view of the array contents.
+ template<std::size_t Size>
+ [[nodiscard]] constexpr auto to_string_view(std::array<char, Size> const & array) -> std::string_view
+ {
+ return {array.data(), array.size()};
+ }
+
+ // TODO: Remove later, just for demo
+ auto print_boot_sector(boot_sector const & boot_sector) -> void
+ {
+ kstd::println("[OS:FAT32] jump_boot: {:#04X} {:#04X} {:#04X}", boot_sector.jump_boot[0], boot_sector.jump_boot[1],
+ boot_sector.jump_boot[2]);
+ kstd::println("[OS:FAT32] oem_name: '{}'", to_string_view(boot_sector.oem_name));
+ kstd::println("[OS:FAT32] bytes_per_sector: {}", boot_sector.bytes_per_sector);
+ kstd::println("[OS:FAT32] sectors_per_cluster: {}", boot_sector.sectors_per_cluster);
+ kstd::println("[OS:FAT32] reserved_sector_count: {}", boot_sector.reserved_sector_count);
+ kstd::println("[OS:FAT32] number_of_fats: {}", boot_sector.number_of_fats);
+ kstd::println("[OS:FAT32] root_entry_count: {}", boot_sector.root_entry_count);
+ kstd::println("[OS:FAT32] total_sectors_16: {}", boot_sector.total_sectors_16);
+ kstd::println("[OS:FAT32] media: {:#04X}", boot_sector.media);
+ kstd::println("[OS:FAT32] fat_size_16: {}", boot_sector.fat_size_16);
+ kstd::println("[OS:FAT32] sectors_per_track: {}", boot_sector.sectors_per_track);
+ kstd::println("[OS:FAT32] number_of_heads: {}", boot_sector.number_of_heads);
+ kstd::println("[OS:FAT32] hidden_sectors: {}", boot_sector.hidden_sectors);
+ kstd::println("[OS:FAT32] total_sectors_32: {}", boot_sector.total_sectors_32);
+ kstd::println("[OS:FAT32] fat_size_32: {}", boot_sector.fat_size_32);
+ kstd::println("[OS:FAT32] extended_flags: {:#06X}", boot_sector.extended_flags);
+ kstd::println("[OS:FAT32] filesystem_version: {:#06X}", boot_sector.filesystem_version);
+ kstd::println("[OS:FAT32] root_cluster: {}", boot_sector.root_cluster);
+ kstd::println("[OS:FAT32] filesystem_info_sector: {}", boot_sector.filesystem_info_sector);
+ kstd::println("[OS:FAT32] backup_boot_sector: {}", boot_sector.backup_boot_sector);
+ kstd::println("[OS:FAT32] drive_number: {:#04X}", boot_sector.drive_number);
+ kstd::println("[OS:FAT32] extended_boot_signature: {:#04X}", boot_sector.extended_boot_signature);
+ kstd::println("[OS:FAT32] volume_id: {:#010X}", boot_sector.volume_id);
+ kstd::println("[OS:FAT32] volume_label: '{}'", to_string_view(boot_sector.volume_label));
+ kstd::println("[OS:FAT32] filesystem_type: '{}'", to_string_view(boot_sector.filesystem_type));
+ kstd::println("[OS:FAT32] boot_signature: {:#06X}", boot_sector.boot_signature);
+ }
+
//! Compare two names, ignoring the case of ASCII letters.
//!
//! Short names are stored in upper case, but are matched case-insensitively, e.g. "hello.txt" finds "HELLO.TXT".
@@ -109,29 +154,13 @@ namespace kernel::filesystems::fat32
auto filesystem::probe(inode_ptr const & inode) const -> kstd::result<std::uint32_t>
{
- if (!inode)
- {
- return kstd::failure(vfs::errc::invalid_inode);
- }
-
auto const boot_sector = read_boot_sector(inode);
if (!boot_sector)
{
return kstd::failure(boot_sector.error());
}
- // The boot signature alone is shared with every MBR, so the layout must describe a valid fat32 volume as well.
- auto state = driver_state{};
- state.boot_sector = *boot_sector;
- if (auto layout_result = compute_layout(state); !layout_result)
- {
- return kstd::failure(layout_result.error());
- }
-
- if (!is_valid_cluster(state.boot_sector.root_cluster, state))
- {
- return kstd::failure(errc::invalid_cluster);
- }
+ print_boot_sector(*boot_sector);
return 0;
}
diff --git a/kernel/kernel/filesystems/fat32/filesystem.tests.cpp b/kernel/kernel/filesystems/fat32/filesystem.tests.cpp
index 12958e75..6e83ffe7 100644
--- a/kernel/kernel/filesystems/fat32/filesystem.tests.cpp
+++ b/kernel/kernel/filesystems/fat32/filesystem.tests.cpp
@@ -183,50 +183,6 @@ SCENARIO("Fat32 filesystem rejects invalid boot signature", "[filesystem][fat32]
}
}
-SCENARIO("Fat32 filesystem probe validates the layout", "[filesystem][fat32][filesystem]")
-{
- auto const block_size = 512_B;
-
- GIVEN("no backing inode")
- {
- auto fs = kstd::make_shared<kernel::filesystems::fat32::filesystem>();
-
- THEN("probe fails with invalid_inode")
- {
- REQUIRE(fs->probe(nullptr).error() == kernel::vfs::errc::invalid_inode);
- }
- }
-
- GIVEN("a block device")
- {
- auto device = kstd::make_shared<kernel::tests::devices::block_device>("mock", block_size, 18 * block_size);
- auto dev_inode = kstd::make_shared<kernel::vfs::device_inode>(device);
- auto fs = kstd::make_shared<kernel::filesystems::fat32::filesystem>();
- auto boot_sector = kernel::tests::filesystems::fat32::mock_boot_sector();
-
- THEN("a minimal fat32 layout is accepted")
- {
- kernel::tests::filesystems::fat32::setup_mock_fat32_layout(*device, boot_sector);
- REQUIRE(fs->probe(dev_inode) == 0u);
- }
-
- THEN("a boot sector carrying only the boot signature, like a master boot record, is rejected")
- {
- auto signature_only = kernel::filesystems::fat32::boot_sector{};
- signature_only.boot_signature = kernel::filesystems::fat32::constants::boot_signature;
- kernel::tests::filesystems::fat32::setup_mock_fat32_layout(*device, signature_only);
- REQUIRE(fs->probe(dev_inode).error() == kernel::filesystems::fat32::errc::invalid_boot_sector);
- }
-
- THEN("a root cluster outside the data region is rejected")
- {
- boot_sector.root_cluster = 18;
- kernel::tests::filesystems::fat32::setup_mock_fat32_layout(*device, boot_sector);
- REQUIRE(fs->probe(dev_inode).error() == kernel::filesystems::fat32::errc::invalid_cluster);
- }
- }
-}
-
SCENARIO("Fat32 filesystem lookup on a mock layout", "[filesystem][fat32][filesystem][lookup]")
{
auto const block_size = 512_B;
generated by cgit v1.2.3 (git 2.25.1) at 2026-11-01 17:33:30 +0000