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plan_block_allocation

fs_ext4::alloc

Function plan_block_allocation 

Source 
pub fn plan_block_allocation<F>(
    sb: &Superblock,
    groups: &[BlockGroupDescriptor],
    count: u32,
    hint_group: u32,
    bitmap_reader: F,
) -> Result<BlockAllocationPlan>
where
    F: FnMut(u64) -> Result<Vec<u8>>,
Expand description

Plan allocation of count contiguous blocks.

bitmap_reader is called with a BGD’s bg_block_bitmap and must return the full bitmap block (block_size bytes). Groups are tried in order: hint_group first, then wrapping forward. For groups flagged BLOCK_UNINIT, the bitmap is treated as all-free without reading.