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0b059f Bob Green 2026-09-02 14:20:10
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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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block_device_t <|-- vmp_t
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vfs_fs_t <|-- vmp_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.