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# Filesystem Layer
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```mermaid
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---
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title: Filesystem Structures
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---
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classDiagram
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class vmp_t{
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block_device-t *dev_driver
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vfs_fs_t *fs_driver
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char name[16]
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uint8_t block_buff[BLOCK_DEVICE_BLOCK_SIZE]
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unsigned int mounted : 1
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unsigned int read_only : 1
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uint8_t subdev
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union fs_data
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}
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class block_device_t {
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bool_t active
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char name[16]
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uint8_t num_sub_devices
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int (*init)(block_device_t *dev)
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int (*finish)(void)
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int (*read_block)(uint32_t block_num, uint8_t *buff, uint8_t subdev)
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int (*write_block)(uint32_t block_num, uint8_t *buff, uint8_t subdev)
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void *driver_data
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}
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class vfs_fs_t {
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uint8_t type
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int (*handles_path)(const char *pathname)
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char *name
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block_device_t *dev
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vfs_t api
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}
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class fs_data <<union>> {
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ext2_fs_t e2fs
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}
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class vfile_t {
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char path[PATH_MAX]
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bool_t open
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vmp_t *mp
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union file_fs_data
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}
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class file_fs_data <<union>> {
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ext2_dirp_t e2dir
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}
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block_device_t <|-- vmp_t
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vfs_fs_t <|-- vmp_t
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file_fs_data <|-- vfile_t
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```
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> [!NOTE]
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> This diagram is evolving as I am in the process of implementing
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> the code for this. Anything could change, so come back often.