RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 18:57:45 +00:00
Code Issues Activity Actions

Kernel: Add TmpFS

Browse source 
This is an FS that stores all of its contents directly in memory.
It's mounted on /tmp by default.
This commit is contained in:
Sergey Bugaev 2019-08-15 18:16:45 +03:00 • committed by Andreas Kling
parent d92ba85689
commit b4c607a8da
4 changed files with 429 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

80
Kernel/FileSystem/TmpFS.h Normal file
View file

@ -0,0 +1,80 @@
#pragma once
#include <AK/Optional.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/KBuffer.h>
class TmpFSInode;
class TmpFS final : public FS {
friend class TmpFSInode;
public:
virtual ~TmpFS() override;
static NonnullRefPtr<TmpFS> create();
virtual bool initialize() override;
virtual const char* class_name() const override { return "TmpFS"; }
virtual InodeIdentifier root_inode() const override;
virtual RefPtr<Inode> get_inode(InodeIdentifier) const override;
virtual RefPtr<Inode> create_inode(InodeIdentifier parent_id, const String& name, mode_t, off_t size, dev_t, int& error) override;
virtual RefPtr<Inode> create_directory(InodeIdentifier parent_id, const String& name, mode_t, int& error) override;
private:
TmpFS();
RefPtr<TmpFSInode> m_root_inode;
HashMap<unsigned, NonnullRefPtr<TmpFSInode>> m_inodes;
void register_inode(TmpFSInode&);
void unregister_inode(InodeIdentifier);
unsigned m_next_inode_index { 1 };
unsigned next_inode_index();
};
class TmpFSInode final : public Inode {
friend class TmpFS;
public:
virtual ~TmpFSInode() override;
TmpFS& fs() { return static_cast<TmpFS&>(Inode::fs()); }
const TmpFS& fs() const { return static_cast<const TmpFS&>(Inode::fs()); }
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, u8* buffer, FileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const override;
virtual InodeIdentifier lookup(StringView name) override;
virtual void flush_metadata() override;
virtual ssize_t write_bytes(off_t, ssize_t, const u8* buffer, FileDescription*) override;
virtual KResult add_child(InodeIdentifier child_id, const StringView& name, mode_t) override;
virtual KResult remove_child(const StringView& name) override;
virtual size_t directory_entry_count() const override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
virtual KResult truncate(off_t) override;
virtual int set_atime(time_t) override;
virtual int set_ctime(time_t) override;
virtual int set_mtime(time_t) override;
virtual void one_ref_left() override;
private:
TmpFSInode(TmpFS& fs, InodeMetadata metadata, InodeIdentifier parent);
static NonnullRefPtr<TmpFSInode> create(TmpFS&, InodeMetadata metadata, InodeIdentifier parent);
static NonnullRefPtr<TmpFSInode> create_root(TmpFS&);
InodeMetadata m_metadata;
InodeIdentifier m_parent;
Optional<KBuffer> m_content;
struct Child {
FS::DirectoryEntry entry;
NonnullRefPtr<TmpFSInode> inode;
};
HashMap<String, Child> m_children;
};