mount.hpp

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#pragma once
 
#include "filesystem.hpp"
 
namespace vfs {
 
struct MountPoint {
  const char* mount_path{nullptr};
  Dentry* mount_dentry{nullptr};
  FileSystem* filesystem{nullptr};
  BlockDevice* device{nullptr};
  Inode* root_inode{nullptr};
  Dentry* root_dentry{nullptr};
  bool active{false};
};
class MountTable {
 public:
  static constexpr size_t kMaxMounts = 16;
 
  MountTable() = default;
  MountTable(const MountTable&) = delete;
  MountTable(MountTable&&) = delete;
  auto operator=(const MountTable&) -> MountTable& = delete;
  auto operator=(MountTable&&) -> MountTable& = delete;
  ~MountTable() = default;
 
  [[nodiscard]] auto Mount(const char* path, FileSystem* fs,
                           BlockDevice* device) -> Expected<void>;
 
  [[nodiscard]] auto Unmount(const char* path) -> Expected<void>;
 
  [[nodiscard]] auto Lookup(const char* path) -> MountPoint*;
 
  [[nodiscard]] auto GetRootDentry(MountPoint* mp) -> Dentry*;
 
  [[nodiscard]] auto FindByMountDentry(const Dentry* dentry) -> MountPoint*;
 
  [[nodiscard]] auto IsMountPoint(const char* path) -> bool;
 
  [[nodiscard]] auto GetRootMount() -> MountPoint*;
 
 private:
  MountPoint mounts_[kMaxMounts]{};
  size_t mount_count_{0};
  MountPoint* root_mount_{nullptr};
};
 
[[nodiscard]] auto GetMountTable() -> MountTable&;
 
}  // namespace vfs