Filesystem Layer

---
title: Filesystem Structures
---
classDiagram
    class vmp_t{
        block_device-t *dev_driver;
        vfs_fs_t *fs_driver;
        char name[16];
        uint8_t block_buff[BLOCK_DEVICE_BLOCK_SIZE];
        unsigned int mounted : 1;
        unsigned int read_only : 1;
        uint8_t subdev;
        union fs_data;
    }
    class block_device_t {
        bool_t active;
        char name[16];
        uint8_t num_sub_devices;

        int (*init)(block_device_t *dev);
        int (*finish)(void);

        int (*read_block)(uint32_t block_num, uint8_t *buff, uint8_t subdev);
        int (*write_block)(uint32_t block_num, uint8_t *buff, uint8_t subdev);

        void *driver_data;
    }
    class vfs_fs_t {
        uint8_t type;
        int (*handles_path)(const char *pathname);
        char *name;
        block_device_t *dev;
        vfs_t api;
    }
    class fs_data <<union>> {
        ext2_fs_t   e2fs;
    }

    block_device_t <|-- vmp_t
    vfs_fs_t <|-- vmp_t