Anatol Belski 833b360e18 block: Convert qcow raw file table and cluster writes to positional ...

Replace the seek then read/write metadata access in QcowRawFile with
positional read_exact_at, write_all_at, and write_all_zeroes_at on the
AlignedFile. read_pointer_table, write_pointer_table,
write_pointer_table_direct, zero_cluster, and write_cluster no longer
move the file cursor.

These calls still route through AlignedFile, which implements FileExt
and WriteZeroesAt with the O_DIRECT alignment bounce, so the unaligned
behavior is preserved. Each access already issued an absolute seek
before touching the file, so the cursor never carried state between
calls and dropping it is unobservable.

Decoding the pointer table now uses native from_be_bytes over the read
buffer, matching the to_be_bytes path on the write side.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>

2026-06-29 21:55:08 +00:00

..

src

block: Convert qcow raw file table and cluster writes to positional

2026-06-29 21:55:08 +00:00

Cargo.toml

performance-metrics: Switch to QcowDisk

2026-06-08 13:19:32 +00:00