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BAN: Implement Ext2 file unlinking

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Ext2 inodes can now be unlinked from directories and after last
inode closes (destructor gets called) we check if link count is 0
and cleanup the inode from filesystem
This commit is contained in:
Bananymous
2023-10-25 21:43:36 +03:00
parent 3566ddab00
commit b7007016c0
9 changed files with 160 additions and 18 deletions
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3
kernel/include/kernel/FS/Ext2/FileSystem.h
View File

@@ -58,7 +58,7 @@ namespace Kernel
BAN::ErrorOr<void> initialize_root_inode();
BAN::ErrorOr<uint32_t> create_inode(const Ext2::Inode&);
BAN::ErrorOr<void> delete_inode(uint32_t);
void delete_inode(uint32_t);
BAN::ErrorOr<void> resize_inode(uint32_t, size_t);
void read_block(uint32_t, BlockBufferWrapper&);
@@ -68,6 +68,7 @@ namespace Kernel
BlockBufferWrapper get_block_buffer();
BAN::ErrorOr<uint32_t> reserve_free_block(uint32_t primary_bgd);
void release_block(uint32_t block);
BAN::HashMap<ino_t, BAN::RefPtr<Ext2Inode>>& inode_cache() { return m_inode_cache; }

5
kernel/include/kernel/FS/Ext2/Inode.h
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@@ -13,6 +13,8 @@ namespace Kernel
class Ext2Inode final : public Inode
{
public:
~Ext2Inode();
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; }
@@ -32,6 +34,7 @@ namespace Kernel
virtual BAN::ErrorOr<void> list_next_inodes_impl(off_t, DirectoryEntryList*, size_t) override;
virtual BAN::ErrorOr<void> create_file_impl(BAN::StringView, mode_t, uid_t, gid_t) override;
virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) override;
virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) override;
virtual BAN::ErrorOr<BAN::String> link_target_impl() override;
@@ -45,6 +48,8 @@ namespace Kernel
BAN::ErrorOr<void> link_inode_to_directory(Ext2Inode&, BAN::StringView name);
void cleanup_from_fs();
BAN::ErrorOr<uint32_t> allocate_new_block();
BAN::ErrorOr<void> sync();

4
kernel/include/kernel/FS/Inode.h
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@@ -91,7 +91,7 @@ namespace Kernel
BAN::ErrorOr<void> list_next_inodes(off_t, DirectoryEntryList*, size_t);
BAN::ErrorOr<void> create_file(BAN::StringView, mode_t, uid_t, gid_t);
BAN::ErrorOr<void> create_directory(BAN::StringView, mode_t, uid_t, gid_t);
BAN::ErrorOr<void> delete_inode(BAN::StringView);
BAN::ErrorOr<void> unlink(BAN::StringView);
// Link API
BAN::ErrorOr<BAN::String> link_target();
@@ -109,7 +109,7 @@ namespace Kernel
virtual BAN::ErrorOr<void> list_next_inodes_impl(off_t, DirectoryEntryList*, size_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> create_file_impl(BAN::StringView, mode_t, uid_t, gid_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> delete_inode_impl(BAN::StringView) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) { return BAN::Error::from_errno(ENOTSUP); }
// Link API
virtual BAN::ErrorOr<BAN::String> link_target_impl() { return BAN::Error::from_errno(ENOTSUP); }

2
kernel/include/kernel/FS/RamFS/Inode.h
View File

@@ -97,7 +97,7 @@ namespace Kernel
virtual BAN::ErrorOr<void> list_next_inodes_impl(off_t, DirectoryEntryList*, size_t) override;
virtual BAN::ErrorOr<void> create_file_impl(BAN::StringView, mode_t, uid_t, gid_t) override;
virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) override;
virtual BAN::ErrorOr<void> delete_inode_impl(BAN::StringView) override;
virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) override;
private:
static constexpr size_t m_name_max = NAME_MAX;