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cbf78975f1
We have a problem with the original utimensat syscall because when we do call LibC futimens function, internally we provide an empty path, and the Kernel get_syscall_path_argument method will detect this as an invalid path. This happens to spit an error for example in the touch utility, so if a user is running "touch non_existing_file", it will create that file, but the user will still see an error coming from LibC futimens function. This new syscall gets an open file description and it provides the same functionality as utimensat, on the specified open file description. The new syscall will be used later by LibC to properly implement LibC futimens function so the situation described with relation to the "touch" utility could be fixed.
128 lines
6.3 KiB
C++
128 lines
6.3 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/Error.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/FileSystem/FileBackedFileSystem.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/InodeIdentifier.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/FileSystem/Mount.h>
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#include <Kernel/FileSystem/UnveilNode.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Locking/SpinlockProtected.h>
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namespace Kernel {
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// Kernel internal options.
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#define O_NOFOLLOW_NOERROR (1 << 29)
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#define O_UNLINK_INTERNAL (1 << 30)
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struct UidAndGid {
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UserID uid;
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GroupID gid;
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};
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enum class AccessFlags {
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None = 0,
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EffectiveAccess = 1 << 0,
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DoNotFollowSymlinks = 1 << 1,
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};
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AK_ENUM_BITWISE_OPERATORS(AccessFlags);
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class VirtualFileSystem {
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public:
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// Required to be at least 8 by POSIX
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html
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static constexpr int symlink_recursion_limit = 8;
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static void initialize();
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static VirtualFileSystem& the();
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VirtualFileSystem();
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~VirtualFileSystem();
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ErrorOr<void> mount_root(FileSystem&);
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ErrorOr<void> mount(FileSystem&, Custody& mount_point, int flags);
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ErrorOr<void> bind_mount(Custody& source, Custody& mount_point, int flags);
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ErrorOr<void> remount(Custody& mount_point, int new_flags);
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ErrorOr<void> unmount(Custody& mount_point);
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ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Credentials const&, StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
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ErrorOr<NonnullRefPtr<OpenFileDescription>> open(Process const&, Credentials const&, StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
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ErrorOr<NonnullRefPtr<OpenFileDescription>> create(Credentials const&, StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
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ErrorOr<NonnullRefPtr<OpenFileDescription>> create(Process const&, Credentials const&, StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
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ErrorOr<void> mkdir(Credentials const&, StringView path, mode_t mode, Custody& base);
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ErrorOr<void> link(Credentials const&, StringView old_path, StringView new_path, Custody& base);
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ErrorOr<void> unlink(Credentials const&, StringView path, Custody& base);
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ErrorOr<void> symlink(Credentials const&, StringView target, StringView linkpath, Custody& base);
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ErrorOr<void> rmdir(Credentials const&, StringView path, Custody& base);
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ErrorOr<void> chmod(Credentials const&, StringView path, mode_t, Custody& base, int options = 0);
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ErrorOr<void> chmod(Credentials const&, Custody&, mode_t);
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ErrorOr<void> chown(Credentials const&, StringView path, UserID, GroupID, Custody& base, int options);
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ErrorOr<void> chown(Credentials const&, Custody&, UserID, GroupID);
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ErrorOr<void> access(Credentials const&, StringView path, int mode, Custody& base, AccessFlags);
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ErrorOr<InodeMetadata> lookup_metadata(Credentials const&, StringView path, Custody& base, int options = 0);
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ErrorOr<void> utime(Credentials const&, StringView path, Custody& base, time_t atime, time_t mtime);
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ErrorOr<void> utimensat(Credentials const&, StringView path, Custody& base, timespec const& atime, timespec const& mtime, int options = 0);
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ErrorOr<void> do_utimens(Credentials const& credentials, Custody& custody, timespec const& atime, timespec const& mtime);
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ErrorOr<void> rename(Credentials const&, Custody& old_base, StringView oldpath, Custody& new_base, StringView newpath);
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ErrorOr<void> mknod(Credentials const&, StringView path, mode_t, dev_t, Custody& base);
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ErrorOr<NonnullRefPtr<Custody>> open_directory(Credentials const&, StringView path, Custody& base);
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ErrorOr<void> for_each_mount(Function<ErrorOr<void>(Mount const&)>) const;
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ErrorOr<NonnullRefPtr<FileBackedFileSystem>> find_already_existing_or_create_file_backed_file_system(OpenFileDescription& description, Function<ErrorOr<NonnullRefPtr<FileSystem>>(OpenFileDescription&)> callback);
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InodeIdentifier root_inode_id() const;
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void sync_filesystems();
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void lock_all_filesystems();
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static void sync();
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NonnullRefPtr<Custody> root_custody();
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ErrorOr<NonnullRefPtr<Custody>> resolve_path(Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
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ErrorOr<NonnullRefPtr<Custody>> resolve_path(Process const&, Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
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ErrorOr<NonnullRefPtr<Custody>> resolve_path_without_veil(Credentials const&, StringView path, NonnullRefPtr<Custody> base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
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private:
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friend class OpenFileDescription;
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UnveilNode const& find_matching_unveiled_path(Process const&, StringView path);
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ErrorOr<void> validate_path_against_process_veil(Process const&, StringView path, int options);
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ErrorOr<void> validate_path_against_process_veil(Process const& process, Custody const& custody, int options);
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ErrorOr<void> validate_path_against_process_veil(Custody const& path, int options);
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ErrorOr<void> validate_path_against_process_veil(StringView path, int options);
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bool is_vfs_root(InodeIdentifier) const;
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ErrorOr<void> traverse_directory_inode(Inode&, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>);
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bool mount_point_exists_at_inode(InodeIdentifier inode);
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// FIXME: These functions are totally unsafe as someone could unmount the returned Mount underneath us.
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Mount* find_mount_for_host(InodeIdentifier);
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Mount* find_mount_for_guest(InodeIdentifier);
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RefPtr<Inode> m_root_inode;
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SpinlockProtected<RefPtr<Custody>, LockRank::None> m_root_custody {};
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SpinlockProtected<IntrusiveList<&Mount::m_vfs_list_node>, LockRank::None> m_mounts {};
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SpinlockProtected<IntrusiveList<&FileBackedFileSystem::m_file_backed_file_system_node>, LockRank::None> m_file_backed_file_systems_list {};
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SpinlockProtected<IntrusiveList<&FileSystem::m_file_system_node>, LockRank::FileSystem> m_file_systems_list {};
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};
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}
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