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Kernel/SysFS: Prevent allocation for component name during construction

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Instead, allocate before constructing the object and pass NonnullOwnPtr
of KString to the object if needed. Some classes can determine their
names as they have a known attribute to look for or have a static name.
This commit is contained in:
Liav A 2021-12-12 16:33:08 +02:00 • committed by Andreas Kling
parent 4daf07e69f
commit 478f543899
17 changed files with 116 additions and 65 deletions
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11
Kernel/FileSystem/SysFS.h
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@ -18,6 +18,7 @@ class SysFSRootDirectory final : public SysFSDirectory {
friend class SysFSComponentRegistry;
public:
virtual StringView name() const override { return "."sv; }
static NonnullRefPtr<SysFSRootDirectory> create();
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
@ -33,17 +34,20 @@ class SysFSDeviceComponent final
public:
static NonnullRefPtr<SysFSDeviceComponent> must_create(Device const&);
virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); }
bool is_block_device() const { return m_block_device; }
private:
explicit SysFSDeviceComponent(Device const&);
SysFSDeviceComponent(NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&);
IntrusiveListNode<SysFSDeviceComponent, NonnullRefPtr<SysFSDeviceComponent>> m_list_node;
bool m_block_device;
NonnullOwnPtr<KString> m_major_minor_formatted_device_name;
};
class SysFSDevicesDirectory final : public SysFSDirectory {
public:
virtual StringView name() const override { return "dev"sv; }
static NonnullRefPtr<SysFSDevicesDirectory> must_create(SysFSRootDirectory const&);
private:
@ -52,6 +56,7 @@ private:
class SysFSBlockDevicesDirectory final : public SysFSDirectory {
public:
virtual StringView name() const override { return "block"sv; }
static NonnullRefPtr<SysFSBlockDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
@ -62,6 +67,7 @@ private:
class SysFSCharacterDevicesDirectory final : public SysFSDirectory {
public:
virtual StringView name() const override { return "char"sv; }
static NonnullRefPtr<SysFSCharacterDevicesDirectory> must_create(SysFSDevicesDirectory const&);
virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual RefPtr<SysFSComponent> lookup(StringView name) override;
@ -74,6 +80,7 @@ class SysFSBusDirectory : public SysFSDirectory {
friend class SysFSComponentRegistry;
public:
virtual StringView name() const override { return "bus"sv; }
static NonnullRefPtr<SysFSBusDirectory> must_create(SysFSRootDirectory const&);
private: