Module util 

Shared helpers for on-disk structures

Little-endian writer functions for placing typed values into raw byte buffers at known offsets, and a raw CRC32C matching the kernel’s format.

Functions

btrfs_csum_data

Standard CRC32C matching the kernel’s hash_crc32c() / btrfs on-disk checksum format.

btrfs_name_hash

Btrfs name hash for DIR_ITEM and DIR_INDEX key offsets.

csum_tree_block

Recompute the checksum of a tree block and write it into the header.

get_uuid

Read a UUID (16 bytes) from a Buf, advancing the cursor.

raw_crc32c

Raw CRC32C matching the kernel’s crc32c_le() function.

write_disk_key

Write a DiskKey (17 bytes) into buf at byte offset off.

write_le_u16

Write a little-endian u16 into buf at byte offset off.

write_le_u32

Write a little-endian u32 into buf at byte offset off.

write_le_u64

Write a little-endian u64 into buf at byte offset off.

write_uuid

Write a UUID (16 bytes) into buf at byte offset off.