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use alloc::rc::{Rc, Weak};
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/// Abstract operations on a inode.
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pub trait INode {
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fn open(&mut self, flags: u32) -> Result<(), ()>;
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fn close(&mut self) -> Result<(), ()>;
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fn read_at(&mut self, offset: usize, buf: &mut [u8]) -> Option<usize>;
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fn write_at(&mut self, offset: usize, buf: &[u8]) -> Option<usize>;
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// fn fstat(&mut self, buf: &[u8]) -> Result<(), ()>;
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fn sync(&mut self) -> Result<(), ()>;
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// fn name_file(&mut self) -> Result<(), ()>;
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// fn reclaim(&mut self) -> Result<(), ()>;
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// fn get_type(&mut self) -> Result<u32, ()>;
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// fn try_seek(&mut self, offset: u64) -> Result<(), ()>;
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// fn truncate(&mut self, len: u64) -> Result<(), ()>;
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// fn create(&mut self, name: &'static str, excl: bool) -> Result<(), ()>;
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// fn loopup(&mut self, path: &'static str) -> Result<(), ()>;
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// fn io_ctrl(&mut self, op: u32, data: &[u8]) -> Result<(), ()>;
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}
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/// Abstract filesystem
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pub trait FileSystem {
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type INode: INode;
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fn sync(&mut self) -> Result<(), ()>;
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fn root_inode(&mut self) -> Rc<Self::INode>;
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fn unmount(&mut self) -> Result<(), ()>;
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fn cleanup(&mut self);
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}
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