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Kernel: Start work on writable ext2 filesystem

This commit is contained in:
Bananymous 2023-08-31 23:40:31 +03:00
parent 195ccf4f53
commit f31c6b847f
2 changed files with 635 additions and 209 deletions
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27
kernel/include/kernel/FS/Ext2.h
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@ -123,7 +123,7 @@ namespace Kernel
class Ext2Inode final : public Inode
{
public:
virtual ino_t ino() const override { return m_index; };
virtual ino_t ino() const override { return m_ino; };
virtual Mode mode() const override { return { m_inode.mode }; }
virtual nlink_t nlink() const override { return m_inode.links_count; }
virtual uid_t uid() const override { return m_inode.uid; }
@ -144,28 +144,31 @@ namespace Kernel
virtual BAN::ErrorOr<size_t> read(size_t, void*, size_t) override;
virtual BAN::ErrorOr<size_t> write(size_t, const void*, size_t) override;
virtual BAN::ErrorOr<void> truncate(size_t) override;
virtual BAN::ErrorOr<void> create_file(BAN::StringView, mode_t, uid_t, gid_t) override;
private:
BAN::ErrorOr<uint32_t> data_block_index(uint32_t);
BAN::ErrorOr<void> for_data_block_index(uint32_t, const BAN::Function<void(uint32_t&)>&, bool allocate);
uint32_t index() const { return m_index; }
BAN::ErrorOr<uint32_t> data_block_index(uint32_t);
BAN::ErrorOr<uint32_t> allocate_new_block();
BAN::ErrorOr<void> sync();
uint32_t block_group() const;
private:
Ext2Inode(Ext2FS& fs, Ext2::Inode inode, uint32_t index, BAN::StringView name)
Ext2Inode(Ext2FS& fs, Ext2::Inode inode, uint32_t ino)
: m_fs(fs)
, m_inode(inode)
, m_name(name)
, m_index(index)
, m_inode(inode)
, m_ino(ino)
{}
static BAN::ErrorOr<BAN::RefPtr<Inode>> create(Ext2FS&, uint32_t, BAN::StringView);
static BAN::ErrorOr<BAN::RefPtr<Inode>> create(Ext2FS&, uint32_t);
private:
Ext2FS& m_fs;
Ext2::Inode m_inode;
BAN::String m_name;
uint32_t m_index;
const uint32_t m_ino;
friend class Ext2FS;
friend class BAN::RefPtr<Ext2Inode>;
@ -192,6 +195,9 @@ namespace Kernel
void read_block(uint32_t, BAN::Span<uint8_t>);
void write_block(uint32_t, BAN::Span<const uint8_t>);
void sync_superblock();
BAN::ErrorOr<uint32_t> reserve_free_block(uint32_t primary_bgd);
const Ext2::Superblock& superblock() const { return m_superblock; }
@ -209,6 +215,7 @@ namespace Kernel
Partition& m_partition;
BAN::RefPtr<Inode> m_root_inode;
BAN::Vector<uint32_t> m_superblock_backups;
Ext2::Superblock m_superblock;

817
kernel/kernel/FS/Ext2.cpp
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