Struct RepackedTree 

pub struct RepackedTree {
    pub new_root: Vec<u8>,
    pub block_writes: Vec<(u64, Vec<u8>)>,
    pub used_nodes: Vec<u64>,
    pub allocated_blocks: Vec<u64>,
}

An extent tree laid out again over blocks the file already owns.

Fields

new_root: Vec<u8>

The 60 bytes for the inode’s i_block.

block_writes: Vec<(u64, Vec<u8>)>

Blocks to write, and what to write into them. The tail checksum is the caller’s, as everywhere else here.

used_nodes: Vec<u64>

The blocks from nodes that the layout used, in the order it used them. Everything else in nodes is now unreferenced.

allocated_blocks: Vec<u64>

Blocks alloc handed out, when the file’s own were not enough. The caller accounts for them as it does for any allocation.