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https://github.com/LadybirdBrowser/ladybird.git
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59ed235c85
Files opened with O_DIRECT will now bypass the disk cache in read/write operations (though metadata operations will still hit the disk cache.) This will allow us to test actual disk performance instead of testing disk *cache* performance, if that's what we want. :^) There's room for improvment here, we're very aggressively flushing any dirty cache entries for the specific block before reading/writing that block. This is done by walking the entire cache, which may be slow.
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
#pragma once
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#include <AK/String.h>
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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 <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_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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class Custody;
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class Device;
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class FileDescription;
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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(RefPtr<Custody>&&, NonnullRefPtr<FS>&&);
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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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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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};
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static VFS& the();
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VFS();
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~VFS();
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bool mount_root(NonnullRefPtr<FS>&&);
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KResult mount(NonnullRefPtr<FS>&&, StringView path);
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KResult mount(NonnullRefPtr<FS>&&, Custody& mount_point);
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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);
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KResultOr<NonnullRefPtr<FileDescription>> create(StringView path, int options, mode_t mode, Custody& parent_custody);
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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>* parent = nullptr, int options = 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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NonnullOwnPtrVector<Mount> m_mounts;
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RefPtr<Custody> m_root_custody;
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};
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