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Kernel: Use DistinctNumeric for filesystem ID's

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This patch adds the FileSystemID type, which is a distinct u32.
This prevents accidental conversion from arbitrary integers.
This commit is contained in:
Andreas Kling 2021-11-18 15:11:31 +01:00
parent 7c57961c61
commit e08d213830
18 changed files with 36 additions and 35 deletions
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6
Kernel/FileSystem/FileSystem.cpp
View file

@ -16,9 +16,9 @@
namespace Kernel {
static u32 s_lastFileSystemID;
static Singleton<HashMap<u32, FileSystem*>> s_file_system_map;
static Singleton<HashMap<FileSystemID, FileSystem*>> s_file_system_map;
static HashMap<u32, FileSystem*>& all_file_systems()
static HashMap<FileSystemID, FileSystem*>& all_file_systems()
{
return *s_file_system_map;
}
@ -34,7 +34,7 @@ FileSystem::~FileSystem()
s_file_system_map->remove(m_fsid);
}
FileSystem* FileSystem::from_fsid(u32 id)
FileSystem* FileSystem::from_fsid(FileSystemID id)
{
auto it = all_file_systems().find(id);
if (it != all_file_systems().end())

8
Kernel/FileSystem/FileSystem.h
View file

@ -26,8 +26,8 @@ class FileSystem : public RefCounted<FileSystem> {
public:
virtual ~FileSystem();
unsigned fsid() const { return m_fsid; }
static FileSystem* from_fsid(u32);
FileSystemID fsid() const { return m_fsid; }
static FileSystem* from_fsid(FileSystemID);
static void sync();
static void lock_all();
@ -72,7 +72,7 @@ protected:
mutable Mutex m_lock { "FS" };
private:
unsigned m_fsid { 0 };
FileSystemID m_fsid;
u64 m_block_size { 0 };
size_t m_fragment_size { 0 };
bool m_readonly { false };
@ -94,7 +94,7 @@ namespace AK {
template<>
struct Traits<Kernel::InodeIdentifier> : public GenericTraits<Kernel::InodeIdentifier> {
static unsigned hash(const Kernel::InodeIdentifier& inode) { return pair_int_hash(inode.fsid(), inode.index().value()); }
static unsigned hash(const Kernel::InodeIdentifier& inode) { return pair_int_hash(inode.fsid().value(), inode.index().value()); }
};
}

2
Kernel/FileSystem/Inode.h
View file

@ -35,7 +35,7 @@ public:
FileSystem& fs() { return m_file_system; }
FileSystem const& fs() const { return m_file_system; }
unsigned fsid() const { return m_file_system.fsid(); }
FileSystemID fsid() const { return m_file_system.fsid(); }
InodeIndex index() const { return m_index; }
size_t size() const { return metadata().size; }

7
Kernel/FileSystem/InodeIdentifier.h
View file

@ -15,12 +15,13 @@ namespace Kernel {
class FileSystem;
struct InodeMetadata;
TYPEDEF_DISTINCT_ORDERED_ID(u32, FileSystemID);
TYPEDEF_DISTINCT_ORDERED_ID(u64, InodeIndex);
class InodeIdentifier {
public:
InodeIdentifier() = default;
InodeIdentifier(u32 fsid, InodeIndex inode)
InodeIdentifier(FileSystemID fsid, InodeIndex inode)
: m_fsid(fsid)
, m_index(inode)
{
@ -28,7 +29,7 @@ public:
bool is_valid() const { return m_fsid != 0 && m_index != 0; }
u32 fsid() const { return m_fsid; }
FileSystemID fsid() const { return m_fsid; }
InodeIndex index() const { return m_index; }
FileSystem* fs();
@ -45,7 +46,7 @@ public:
}
private:
u32 m_fsid { 0 };
FileSystemID m_fsid { 0 };
InodeIndex m_index { 0 };
};

2
Kernel/FileSystem/SysFS.cpp
View file

@ -46,7 +46,7 @@ NonnullRefPtr<SysFSRootDirectory> SysFSRootDirectory::create()
return adopt_ref(*new (nothrow) SysFSRootDirectory);
}
ErrorOr<void> SysFSRootDirectory::traverse_as_directory(unsigned fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
ErrorOr<void> SysFSRootDirectory::traverse_as_directory(FileSystemID fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
{
MutexLocker locker(SysFSComponentRegistry::the().get_lock());
TRY(callback({ ".", { fsid, component_index() }, 0 }));

6
Kernel/FileSystem/SysFS.h
View file

@ -19,7 +19,7 @@ class SysFSRootDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSRootDirectory> create();
virtual ErrorOr<void> traverse_as_directory(unsigned, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
private:
SysFSRootDirectory();
@ -53,7 +53,7 @@ private:
class SysFSBlockDevicesDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSBlockDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual ErrorOr<void> traverse_as_directory(unsigned, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
private:
@ -63,7 +63,7 @@ private:
class SysFSCharacterDevicesDirectory final : public SysFSDirectory {
public:
static NonnullRefPtr<SysFSCharacterDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual ErrorOr<void> traverse_as_directory(unsigned, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
private:

2
Kernel/FileSystem/SysFSComponent.cpp
View file

@ -31,7 +31,7 @@ mode_t SysFSComponent::permissions() const
return S_IRUSR | S_IRGRP | S_IROTH;
}
ErrorOr<void> SysFSDirectory::traverse_as_directory(unsigned fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
ErrorOr<void> SysFSDirectory::traverse_as_directory(FileSystemID fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
{
MutexLocker locker(SysFSComponentRegistry::the().get_lock());
VERIFY(m_parent_directory);

4
Kernel/FileSystem/SysFSComponent.h
View file

@ -27,7 +27,7 @@ class SysFSComponent : public RefCounted<SysFSComponent> {
public:
virtual StringView name() const { return m_name->view(); }
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { return Error::from_errno(ENOTIMPL); }
virtual ErrorOr<void> traverse_as_directory(unsigned, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
virtual mode_t permissions() const;
virtual ErrorOr<void> truncate(u64) { return EPERM; }
@ -51,7 +51,7 @@ private:
class SysFSDirectory : public SysFSComponent {
public:
virtual ErrorOr<void> traverse_as_directory(unsigned, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;