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Kernel+SystemServer: Simplify the DevTmpFS design

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We are no longer have a separate Inode object class for the pts
directory. With a small exception to this, all chmod and chown code
is now at one place.
It's now possible to create any name of a sub-directory in the
filesystem.
This commit is contained in:
Liav A 2021-08-20 08:49:07 +03:00 • committed by Andreas Kling
parent a7cb2ca1bf
commit 74c4c864bd
3 changed files with 171 additions and 175 deletions
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80
Kernel/FileSystem/DevTmpFS.h
View file

@ -46,11 +46,13 @@ public:
DevTmpFS const& fs() const { return static_cast<DevTmpFS const&>(Inode::fs()); }
protected:
DevTmpFSInode(DevTmpFS&);
explicit DevTmpFSInode(DevTmpFS&);
DevTmpFSInode(DevTmpFS&, unsigned, unsigned);
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual void flush_metadata() override;
virtual InodeMetadata metadata() const override final;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
@ -59,11 +61,27 @@ protected:
virtual KResult chown(UserID, GroupID) override;
virtual KResult truncate(u64) override;
mode_t m_mode { 0600 };
UserID m_uid { 0 };
GroupID m_gid { 0 };
const unsigned m_major_number { 0 };
const unsigned m_minor_number { 0 };
protected:
enum class Type {
BlockDevice,
CharacterDevice,
Directory,
RootDirectory,
Link
};
virtual Type node_type() const = 0;
private:
IntrusiveListNode<DevTmpFSInode, RefPtr<DevTmpFSInode>> m_list_node;
};
class DevTmpFSDeviceInode : public DevTmpFSInode {
class DevTmpFSDeviceInode final : public DevTmpFSInode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
friend class DevTmpFSDirectoryInode;
@ -74,25 +92,20 @@ public:
private:
DevTmpFSDeviceInode(DevTmpFS&, unsigned, unsigned, bool, NonnullOwnPtr<KString> name);
// ^DevTmpFSInode
virtual Type node_type() const override { return m_block_device ? Type::BlockDevice : Type::CharacterDevice; }
// ^Inode
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
virtual KResult chown(UserID, GroupID) override;
virtual KResult chmod(mode_t) override;
NonnullOwnPtr<KString> m_name;
const unsigned m_major_number;
const unsigned m_minor_number;
const bool m_block_device;
mode_t m_required_mode;
UserID m_uid { 0 };
GroupID m_gid { 0 };
};
class DevTmpFSLinkInode : public DevTmpFSInode {
class DevTmpFSLinkInode final : public DevTmpFSInode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
friend class DevTmpFSDirectoryInode;
public:
virtual StringView name() const override;
@ -100,9 +113,11 @@ public:
protected:
DevTmpFSLinkInode(DevTmpFS&, NonnullOwnPtr<KString>);
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Link; }
// ^Inode
virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
NonnullOwnPtr<KString> m_name;
@ -115,28 +130,23 @@ class DevTmpFSDirectoryInode : public DevTmpFSInode {
public:
virtual ~DevTmpFSDirectoryInode() override;
virtual StringView name() const override { return m_name->view(); }
protected:
DevTmpFSDirectoryInode(DevTmpFS&);
// ^Inode
virtual InodeMetadata metadata() const override;
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Directory; }
IntrusiveList<DevTmpFSInode, NonnullRefPtr<DevTmpFSInode>, &DevTmpFSInode::m_list_node> m_nodes;
};
class DevTmpFSPtsDirectoryInode final : public DevTmpFSDirectoryInode {
friend class DevTmpFS;
friend class DevTmpFSRootDirectoryInode;
public:
virtual ~DevTmpFSPtsDirectoryInode() override;
virtual StringView name() const override { return "pts"; };
private:
explicit DevTmpFSPtsDirectoryInode(DevTmpFS&);
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual KResult remove_child(const StringView& name) override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual InodeMetadata metadata() const override;
DevTmpFSDirectoryInode(DevTmpFS&, NonnullOwnPtr<KString> name);
// ^Inode
OwnPtr<KString> m_name;
IntrusiveList<DevTmpFSInode, NonnullRefPtr<DevTmpFSInode>, &DevTmpFSInode::m_list_node> m_nodes;
private:
explicit DevTmpFSDirectoryInode(DevTmpFS&);
};
class DevTmpFSRootDirectoryInode final : public DevTmpFSDirectoryInode {
@ -147,12 +157,12 @@ public:
virtual StringView name() const override { return "."; }
private:
// ^DevTmpFSInode
virtual Type node_type() const override { return Type::Directory; }
explicit DevTmpFSRootDirectoryInode(DevTmpFS&);
virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual InodeMetadata metadata() const override;
virtual KResult remove_child(const StringView& name) override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(UserID, GroupID) override;
};
}