Method write

block/src/qcow/mod.rs:2088–2108

(&mut self, buf: &[u8])

impl Write for QcowFile {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        let address: u64 = self.current_offset;
        let write_count: usize = self.limit_range_file(address, buf.len());

        let mut nwritten: usize = 0;
        while nwritten < write_count {
            let curr_addr = address + nwritten as u64;
            let offset = self.file_offset_write(curr_addr)?;
            let count = self.limit_range_cluster(curr_addr, write_count - nwritten);

            self.raw_file.file_mut().seek(SeekFrom::Start(offset))?;
            let count = self
                .raw_file
                .file_mut()
                .write(&buf[nwritten..(nwritten + count)])?;

            nwritten += count;
        }
        self.current_offset += write_count as u64;
        Ok(write_count)
    }

    fn flush(&mut self) -> std::io::Result<()> {
        self.sync_caches()?;