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https://github.com/RGBCube/serenity
synced 2025-07-26 02:57:36 +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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return ENOENT;
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}
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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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@ -46,11 +46,13 @@ public:
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DevTmpFS const& fs() const { return static_cast<DevTmpFS const&>(Inode::fs()); }
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protected:
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DevTmpFSInode(DevTmpFS&);
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explicit DevTmpFSInode(DevTmpFS&);
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DevTmpFSInode(DevTmpFS&, unsigned, unsigned);
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual KResultOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual void flush_metadata() override;
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virtual InodeMetadata metadata() const override final;
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virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
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virtual KResultOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
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@ -59,11 +61,27 @@ protected:
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virtual KResult chown(UserID, GroupID) override;
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virtual KResult truncate(u64) override;
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mode_t m_mode { 0600 };
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UserID m_uid { 0 };
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GroupID m_gid { 0 };
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const unsigned m_major_number { 0 };
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const unsigned m_minor_number { 0 };
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protected:
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enum class Type {
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BlockDevice,
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CharacterDevice,
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Directory,
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RootDirectory,
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Link
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};
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virtual Type node_type() const = 0;
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private:
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IntrusiveListNode<DevTmpFSInode, RefPtr<DevTmpFSInode>> m_list_node;
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};
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class DevTmpFSDeviceInode : public DevTmpFSInode {
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class DevTmpFSDeviceInode final : public DevTmpFSInode {
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friend class DevTmpFS;
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friend class DevTmpFSRootDirectoryInode;
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friend class DevTmpFSDirectoryInode;
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@ -74,25 +92,20 @@ public:
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private:
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DevTmpFSDeviceInode(DevTmpFS&, unsigned, unsigned, bool, NonnullOwnPtr<KString> name);
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// ^DevTmpFSInode
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virtual Type node_type() const override { return m_block_device ? Type::BlockDevice : Type::CharacterDevice; }
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// ^Inode
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
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virtual KResult chown(UserID, GroupID) override;
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virtual KResult chmod(mode_t) override;
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NonnullOwnPtr<KString> m_name;
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const unsigned m_major_number;
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const unsigned m_minor_number;
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const bool m_block_device;
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mode_t m_required_mode;
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UserID m_uid { 0 };
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GroupID m_gid { 0 };
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};
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class DevTmpFSLinkInode : public DevTmpFSInode {
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class DevTmpFSLinkInode final : public DevTmpFSInode {
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friend class DevTmpFS;
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friend class DevTmpFSRootDirectoryInode;
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friend class DevTmpFSDirectoryInode;
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public:
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virtual StringView name() const override;
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@ -100,9 +113,11 @@ public:
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protected:
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DevTmpFSLinkInode(DevTmpFS&, NonnullOwnPtr<KString>);
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// ^DevTmpFSInode
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virtual Type node_type() const override { return Type::Link; }
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// ^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;
|
||||
};
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -83,6 +83,13 @@ static void chown_wrapper(const char* path, uid_t uid, gid_t gid)
|
|||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
static void chmod_wrapper(const char* path, mode_t mode)
|
||||
{
|
||||
int rc = chmod(path, mode);
|
||||
if (rc < 0 && errno != ENOENT) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
static void chown_all_matching_device_nodes(group* group, unsigned major_number)
|
||||
{
|
||||
|
|
@ -341,6 +348,21 @@ static void prepare_synthetic_filesystems()
|
|||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
rc = symlink("/proc/self/fd/0", "/dev/stdin");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
rc = symlink("/proc/self/fd/1", "/dev/stdout");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
rc = symlink("/proc/self/fd/2", "/dev/stderr");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
populate_devfs();
|
||||
|
||||
rc = mkdir("/dev/pts", 0755);
|
||||
|
|
@ -357,6 +379,7 @@ static void prepare_synthetic_filesystems()
|
|||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
chmod_wrapper("/dev/urandom", 0666);
|
||||
|
||||
auto phys_group = getgrnam("phys");
|
||||
VERIFY(phys_group);
|
||||
|
|
@ -376,19 +399,6 @@ static void prepare_synthetic_filesystems()
|
|||
VERIFY(audio_group);
|
||||
chown_wrapper("/dev/audio", 0, audio_group->gr_gid);
|
||||
|
||||
rc = symlink("/proc/self/fd/0", "/dev/stdin");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
rc = symlink("/proc/self/fd/1", "/dev/stdout");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
rc = symlink("/proc/self/fd/2", "/dev/stderr");
|
||||
if (rc < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
// Note: We open the /dev/null device and set file descriptors 0, 1, 2 to it
|
||||
// because otherwise these file descriptors won't have a custody, making
|
||||
// the ProcFS file descriptor links (at /proc/PID/fd/{0,1,2}) to have an
|
||||
|
|
@ -396,7 +406,6 @@ static void prepare_synthetic_filesystems()
|
|||
// This affects also every other process that inherits the file descriptors
|
||||
// from SystemServer, so it is important for other things (also for ProcFS
|
||||
// tests that are running in CI mode).
|
||||
|
||||
int stdin_new_fd = open("/dev/null", O_NONBLOCK);
|
||||
if (stdin_new_fd < 0) {
|
||||
VERIFY_NOT_REACHED();
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue