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https://github.com/RGBCube/serenity
synced 2025-07-25 19:37:35 +00:00
Kernel+SystemServer: Simplify the DevTmpFS design
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
Andreas Kling
parent
a7cb2ca1bf
commit
74c4c864bd
3 changed files with 171 additions and 175 deletions
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@ -47,6 +47,13 @@ DevTmpFSInode::DevTmpFSInode(DevTmpFS& fs)
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{
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}
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DevTmpFSInode::DevTmpFSInode(DevTmpFS& fs, unsigned major_number, unsigned minor_number)
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: Inode(fs, fs.allocate_inode_index())
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, m_major_number(major_number)
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, m_minor_number(minor_number)
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{
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}
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KResultOr<size_t> DevTmpFSInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
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{
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VERIFY_NOT_REACHED();
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@ -73,27 +80,84 @@ KResultOr<size_t> DevTmpFSInode::write_bytes(off_t, size_t, const UserOrKernelBu
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
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{
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return EROFS;
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VERIFY_NOT_REACHED();
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}
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KResult DevTmpFSInode::add_child(Inode&, const StringView&, mode_t)
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{
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return EROFS;
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VERIFY_NOT_REACHED();
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}
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InodeMetadata DevTmpFSInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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VERIFY((m_mode & 0777) == m_mode);
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InodeMetadata metadata;
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metadata.uid = m_uid;
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metadata.gid = m_gid;
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metadata.size = 0;
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metadata.mtime = mepoch;
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switch (node_type()) {
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case Type::RootDirectory:
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metadata.inode = { fsid(), 1 };
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metadata.mode = 0040555;
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metadata.uid = 0;
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metadata.gid = 0;
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metadata.size = 0;
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metadata.mtime = mepoch;
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break;
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case Type::Directory:
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metadata.inode = { fsid(), index() };
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metadata.mode = S_IFDIR | m_mode;
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break;
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case Type::BlockDevice:
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metadata.inode = { fsid(), index() };
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metadata.mode = S_IFBLK | m_mode;
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metadata.major_device = m_major_number;
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metadata.minor_device = m_minor_number;
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break;
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case Type::CharacterDevice:
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metadata.inode = { fsid(), index() };
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metadata.mode = S_IFCHR | m_mode;
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metadata.major_device = m_major_number;
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metadata.minor_device = m_minor_number;
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break;
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case Type::Link:
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metadata.inode = { fsid(), index() };
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// FIXME: For now, it might not be possible to change the m_mode due to
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// it pointing to another device node which its absolute_path() is not
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// recognizable by the VirtualFileSystem.
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// When we resolve the issues with the clunky absolute_path() interface,
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// this should work out of the box...
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metadata.mode = S_IFLNK | m_mode;
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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return metadata;
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}
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KResult DevTmpFSInode::remove_child(const StringView&)
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{
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return EROFS;
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VERIFY_NOT_REACHED();
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}
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KResult DevTmpFSInode::chmod(mode_t)
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KResult DevTmpFSInode::chmod(mode_t mode)
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{
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return EPERM;
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MutexLocker locker(m_inode_lock);
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mode &= 0777;
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if (m_mode == mode)
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return KSuccess;
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m_mode = mode;
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return KSuccess;
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}
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KResult DevTmpFSInode::chown(UserID, GroupID)
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KResult DevTmpFSInode::chown(UserID uid, GroupID gid)
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{
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return EPERM;
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MutexLocker locker(m_inode_lock);
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m_uid = uid;
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m_gid = gid;
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return KSuccess;
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}
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KResult DevTmpFSInode::truncate(u64)
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@ -125,18 +189,6 @@ KResultOr<size_t> DevTmpFSLinkInode::read_bytes(off_t offset, size_t, UserOrKern
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return m_link->length();
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}
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InodeMetadata DevTmpFSLinkInode::metadata() const
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{
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InodeMetadata metadata;
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metadata.inode = { fsid(), index() };
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metadata.mode = S_IFLNK | 0555;
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metadata.uid = 0;
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metadata.gid = 0;
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metadata.size = 0;
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metadata.mtime = mepoch;
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return metadata;
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}
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KResultOr<size_t> DevTmpFSLinkInode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription*)
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{
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auto new_string = TRY(buffer.try_copy_into_kstring(count));
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@ -152,30 +204,18 @@ DevTmpFSDirectoryInode::DevTmpFSDirectoryInode(DevTmpFS& fs)
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: DevTmpFSInode(fs)
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{
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}
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DevTmpFSDirectoryInode::DevTmpFSDirectoryInode(DevTmpFS& fs, NonnullOwnPtr<KString> name)
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: DevTmpFSInode(fs)
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, m_name(move(name))
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{
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}
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DevTmpFSDirectoryInode::~DevTmpFSDirectoryInode()
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{
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}
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InodeMetadata DevTmpFSDirectoryInode::metadata() const
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KResult DevTmpFSDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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InodeMetadata metadata;
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metadata.inode = { fsid(), 1 };
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metadata.mode = 0040555;
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metadata.uid = 0;
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metadata.gid = 0;
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metadata.size = 0;
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metadata.mtime = mepoch;
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return metadata;
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}
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DevTmpFSRootDirectoryInode::DevTmpFSRootDirectoryInode(DevTmpFS& fs)
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: DevTmpFSDirectoryInode(fs)
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{
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}
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KResult DevTmpFSRootDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(fs().m_lock);
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MutexLocker locker(m_inode_lock);
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callback({ ".", identifier(), 0 });
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callback({ "..", identifier(), 0 });
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for (auto& node : m_nodes) {
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@ -185,19 +225,20 @@ KResult DevTmpFSRootDirectoryInode::traverse_as_directory(Function<bool(FileSyst
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return KSuccess;
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}
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSRootDirectoryInode::lookup(StringView name)
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSDirectoryInode::lookup(StringView name)
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{
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MutexLocker locker(fs().m_lock);
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MutexLocker locker(m_inode_lock);
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for (auto& node : m_nodes) {
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if (node.name() == name)
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if (node.name() == name) {
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return node;
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}
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}
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return ENOENT;
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return KResult(ENOENT);
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}
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KResult DevTmpFSRootDirectoryInode::remove_child(const StringView& name)
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KResult DevTmpFSDirectoryInode::remove_child(const StringView& name)
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{
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MutexLocker locker(fs().m_lock);
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MutexLocker locker(m_inode_lock);
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for (auto& node : m_nodes) {
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if (node.name() == name) {
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m_nodes.remove(node);
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@ -207,10 +248,9 @@ KResult DevTmpFSRootDirectoryInode::remove_child(const StringView& name)
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return KResult(ENOENT);
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}
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSRootDirectoryInode::create_child(StringView name, mode_t mode, dev_t device_mode, UserID, GroupID)
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSDirectoryInode::create_child(StringView name, mode_t mode, dev_t device_mode, UserID, GroupID)
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{
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MutexLocker locker(fs().m_lock);
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MutexLocker locker(m_inode_lock);
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for (auto& node : m_nodes) {
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if (node.name() == name)
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return KResult(EEXIST);
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@ -219,9 +259,8 @@ KResultOr<NonnullRefPtr<Inode>> DevTmpFSRootDirectoryInode::create_child(StringV
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InodeMetadata metadata;
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metadata.mode = mode;
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if (metadata.is_directory()) {
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if (name != "pts")
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return EROFS;
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auto new_directory_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevTmpFSPtsDirectoryInode(fs())));
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auto name_kstring = TRY(KString::try_create(name));
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auto new_directory_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevTmpFSDirectoryInode(fs(), move(name_kstring))));
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m_nodes.append(*new_directory_inode);
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return new_directory_inode;
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}
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@ -237,32 +276,34 @@ KResultOr<NonnullRefPtr<Inode>> DevTmpFSRootDirectoryInode::create_child(StringV
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if (metadata.is_symlink()) {
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auto name_kstring = TRY(KString::try_create(name));
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auto new_link_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevTmpFSLinkInode(fs(), move(name_kstring))));
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TRY(new_link_inode->chmod(mode));
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m_nodes.append(*new_link_inode);
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return new_link_inode;
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}
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return EROFS;
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}
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DevTmpFSRootDirectoryInode::DevTmpFSRootDirectoryInode(DevTmpFS& fs)
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: DevTmpFSDirectoryInode(fs)
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{
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m_mode = 0555;
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}
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DevTmpFSRootDirectoryInode::~DevTmpFSRootDirectoryInode()
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{
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}
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InodeMetadata DevTmpFSRootDirectoryInode::metadata() const
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KResult DevTmpFSRootDirectoryInode::chmod(mode_t)
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{
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InodeMetadata metadata;
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metadata.inode = { fsid(), 1 };
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metadata.mode = 0040555;
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metadata.uid = 0;
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metadata.gid = 0;
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metadata.size = 0;
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metadata.mtime = mepoch;
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return metadata;
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return EPERM;
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}
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KResult DevTmpFSRootDirectoryInode::chown(UserID, GroupID)
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{
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return EPERM;
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}
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DevTmpFSDeviceInode::DevTmpFSDeviceInode(DevTmpFS& fs, unsigned major_number, unsigned minor_number, bool block_device, NonnullOwnPtr<KString> name)
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: DevTmpFSInode(fs)
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: DevTmpFSInode(fs, major_number, minor_number)
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, m_name(move(name))
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, m_major_number(major_number)
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, m_minor_number(minor_number)
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, m_block_device(block_device)
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{
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}
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@ -271,24 +312,6 @@ DevTmpFSDeviceInode::~DevTmpFSDeviceInode()
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{
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}
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KResult DevTmpFSDeviceInode::chown(UserID uid, GroupID gid)
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{
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MutexLocker locker(m_inode_lock);
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m_uid = uid;
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m_gid = gid;
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return KSuccess;
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}
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KResult DevTmpFSDeviceInode::chmod(mode_t mode)
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{
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MutexLocker locker(m_inode_lock);
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mode &= 0777;
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if (m_required_mode == mode)
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return KSuccess;
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m_required_mode = mode;
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return KSuccess;
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}
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StringView DevTmpFSDeviceInode::name() const
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{
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return m_name->view();
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@ -309,20 +332,6 @@ KResultOr<size_t> DevTmpFSDeviceInode::read_bytes(off_t offset, size_t count, Us
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return result.value();
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}
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InodeMetadata DevTmpFSDeviceInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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InodeMetadata metadata;
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metadata.inode = { fsid(), index() };
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metadata.mode = (m_block_device ? S_IFBLK : S_IFCHR) | m_required_mode;
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metadata.uid = m_uid;
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metadata.gid = m_gid;
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metadata.size = 0;
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metadata.mtime = mepoch;
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metadata.major_device = m_major_number;
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metadata.minor_device = m_minor_number;
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return metadata;
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}
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KResultOr<size_t> DevTmpFSDeviceInode::write_bytes(off_t offset, size_t count, const UserOrKernelBuffer& buffer, OpenFileDescription* description)
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{
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MutexLocker locker(m_inode_lock);
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@ -338,36 +347,4 @@ KResultOr<size_t> DevTmpFSDeviceInode::write_bytes(off_t offset, size_t count, c
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return result.value();
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}
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DevTmpFSPtsDirectoryInode::DevTmpFSPtsDirectoryInode(DevTmpFS& fs)
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: DevTmpFSDirectoryInode(fs)
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{
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}
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KResult DevTmpFSPtsDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(m_inode_lock);
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callback({ ".", identifier(), 0 });
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callback({ "..", identifier(), 0 });
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return KSuccess;
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}
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KResultOr<NonnullRefPtr<Inode>> DevTmpFSPtsDirectoryInode::lookup(StringView)
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{
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return ENOENT;
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}
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DevTmpFSPtsDirectoryInode::~DevTmpFSPtsDirectoryInode()
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{
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}
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InodeMetadata DevTmpFSPtsDirectoryInode::metadata() const
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{
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InodeMetadata metadata;
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metadata.inode = { fsid(), index() };
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metadata.mode = 0040555;
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metadata.uid = 0;
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metadata.gid = 0;
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metadata.size = 0;
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metadata.mtime = mepoch;
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return metadata;
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}
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}
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