d6184afcae
It turns out we don't even need to store the whole custody chain, as we only ever access its last element. So we can just store one custody. This also fixes a performance FIXME :^) Also, rename parent_custody to out_parent.
126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
#pragma once
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#include <AK/Badge.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <AK/String.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/KResult.h>
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#define O_RDONLY 0
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#define O_WRONLY 1
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#define O_RDWR 2
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#define O_EXEC 4
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#define O_CREAT 0100
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#define O_EXCL 0200
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#define O_NOCTTY 0400
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#define O_TRUNC 01000
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#define O_APPEND 02000
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#define O_NONBLOCK 04000
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#define O_DIRECTORY 00200000
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#define O_NOFOLLOW 00400000
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#define O_CLOEXEC 02000000
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#define O_DIRECT 04000000
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#define O_NOFOLLOW_NOERROR 0x4000000
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#define MS_NODEV 1
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#define MS_NOEXEC 2
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#define MS_NOSUID 4
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#define MS_BIND 8
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class Custody;
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class Device;
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class FileDescription;
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struct UidAndGid {
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uid_t uid;
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gid_t gid;
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};
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class VFS {
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AK_MAKE_ETERNAL
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public:
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class Mount {
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public:
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Mount(FS&, Custody* host_custody, int flags);
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Mount(Inode& source, Custody& host_custody, int flags);
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InodeIdentifier host() const;
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InodeIdentifier guest() const { return m_guest; }
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const FS& guest_fs() const { return *m_guest_fs; }
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String absolute_path() const;
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int flags() const { return m_flags; }
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private:
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InodeIdentifier m_host;
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InodeIdentifier m_guest;
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NonnullRefPtr<FS> m_guest_fs;
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RefPtr<Custody> m_host_custody;
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int m_flags;
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};
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static VFS& the();
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VFS();
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~VFS();
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bool mount_root(FS&);
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KResult mount(FS&, Custody& mount_point, int flags);
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KResult bind_mount(Custody& source, Custody& mount_point, int flags);
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KResult unmount(InodeIdentifier guest_inode_id);
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KResultOr<NonnullRefPtr<FileDescription>> open(StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
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KResultOr<NonnullRefPtr<FileDescription>> create(StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
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KResult mkdir(StringView path, mode_t mode, Custody& base);
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KResult link(StringView old_path, StringView new_path, Custody& base);
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KResult unlink(StringView path, Custody& base);
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KResult symlink(StringView target, StringView linkpath, Custody& base);
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KResult rmdir(StringView path, Custody& base);
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KResult chmod(StringView path, mode_t, Custody& base);
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KResult chmod(Inode&, mode_t);
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KResult chown(StringView path, uid_t, gid_t, Custody& base);
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KResult chown(Inode&, uid_t, gid_t);
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KResult access(StringView path, int mode, Custody& base);
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KResultOr<InodeMetadata> lookup_metadata(StringView path, Custody& base, int options = 0);
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KResult utime(StringView path, Custody& base, time_t atime, time_t mtime);
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KResult rename(StringView oldpath, StringView newpath, Custody& base);
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KResult mknod(StringView path, mode_t, dev_t, Custody& base);
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KResultOr<NonnullRefPtr<Custody>> open_directory(StringView path, Custody& base);
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size_t mount_count() const { return m_mounts.size(); }
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void for_each_mount(Function<void(const Mount&)>) const;
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InodeIdentifier root_inode_id() const;
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void sync();
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Custody& root_custody();
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KResultOr<NonnullRefPtr<Custody>> resolve_path(StringView path, 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 FileDescription;
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RefPtr<Inode> get_inode(InodeIdentifier);
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bool is_vfs_root(InodeIdentifier) const;
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void traverse_directory_inode(Inode&, Function<bool(const FS::DirectoryEntry&)>);
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Mount* find_mount_for_host(InodeIdentifier);
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Mount* find_mount_for_guest(InodeIdentifier);
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Lock m_lock { "VFSLock" };
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RefPtr<Inode> m_root_inode;
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Vector<Mount> m_mounts;
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RefPtr<Custody> m_root_custody;
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};
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