Request normalization(ext4_mb_normalize_request()) is key buddy allocator step. Required range size is decided at this moment.
Request is not normalised:
- for metadata
- is exact block requested
- caller ask not normalise
Based on file size (offset + requested size) block count is round to the nearest large from list: 16k, 32k, 64k, 128k, 256k, 512k, 1M, 2M, 4M, 8M.
Already allocated and preallocated ranges are excluded.
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