remove open() & close() from INode

src/sfs.rs

@@ -248,13 +248,6 @@ impl INodeImpl {
 }
 
 impl vfs::INode for INodeImpl {
-    fn open(&self, _flags: u32) -> vfs::Result<()> {
-        // Do nothing
-        Ok(())
-    }
-    fn close(&self) -> vfs::Result<()> {
-        self.sync()
-    }
     fn read_at(&self, offset: usize, buf: &mut [u8]) -> vfs::Result<usize> {
         assert_eq!(self.disk_inode.read().type_, FileType::File, "read_at is only available on file");
         self._read_at(offset, buf)

src/vfs.rs

@@ -11,8 +11,6 @@ pub trait Device: Send {
 
 /// Abstract operations on a inode.
 pub trait INode: Debug + Any + Sync + Send {
-    fn open(&self, flags: u32) -> Result<()>;
-    fn close(&self) -> Result<()>;
     fn read_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize>;
     fn write_at(&self, offset: usize, buf: &[u8]) -> Result<usize>;
     fn info(&self) -> Result<FileInfo>;