vfs.hpp

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#pragma once
 
#include "vfs_types.hpp"
 
namespace vfs {
 
struct Inode {
  uint64_t ino{0};
  FileType type{FileType::kUnknown};
  uint64_t size{0};
  uint32_t permissions{0644};
  uint32_t link_count{1};
  void* fs_private{nullptr};
  FileSystem* fs{nullptr};
 
  InodeOps* ops{nullptr};
};
 
struct Dentry {
  char name[256]{};
  Inode* inode{nullptr};
  Dentry* parent{nullptr};
  Dentry* children{nullptr};
  Dentry* next_sibling{nullptr};
  void* fs_private{nullptr};
  uint32_t ref_count{0};
  bool deleted{false};
};
 
struct File {
  Inode* inode{nullptr};
  Dentry* dentry{nullptr};
  uint64_t offset{0};
  OpenFlags flags{OpenFlags::kOReadOnly};
 
  FileOps* ops{nullptr};
};
 
[[nodiscard]] auto Init() -> Expected<void>;
 
[[nodiscard]] auto Lookup(const char* path) -> Expected<Dentry*>;
 
[[nodiscard]] auto Open(const char* path, OpenFlags flags) -> Expected<File*>;
 
[[nodiscard]] auto Close(File* file) -> Expected<void>;
 
[[nodiscard]] auto Read(File* file, void* buf, size_t count)
    -> Expected<size_t>;
 
[[nodiscard]] auto Write(File* file, const void* buf, size_t count)
    -> Expected<size_t>;
 
[[nodiscard]] auto Seek(File* file, int64_t offset, SeekWhence whence)
    -> Expected<uint64_t>;
 
[[nodiscard]] auto MkDir(const char* path) -> Expected<void>;
 
[[nodiscard]] auto RmDir(const char* path) -> Expected<void>;
 
[[nodiscard]] auto Unlink(const char* path) -> Expected<void>;
 
[[nodiscard]] auto ReadDir(File* file, DirEntry* dirent, size_t count)
    -> Expected<size_t>;
 
[[nodiscard]] auto GetRootDentry() -> Dentry*;
 
}  // namespace vfs