Daniel Verkamp 9c7cd86325 qcow: deallocate clusters in write_zeroes ... When a write_zeroes call covers a whole cluster, we can deallocate the storage for that cluster rather than writing zeroes. This is currently implemented by removing the cluster allocation from the mapping tables, then attempting to release the backing storage using fallocate() with FALLOC_FL_PUNCH_HOLE. BUG=chromium:850998 TEST=cargo test -p qcow Change-Id: Ie4edb2e02bfaa1df9a19919b77eeb3c58c112d1c Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1187019 Reviewed-by: Dylan Reid <dgreid@chromium.org>		2018-09-05 01:25:50 -07:00
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src	qcow: deallocate clusters in write_zeroes	2018-09-05 01:25:50 -07:00
Cargo.toml	qcow: implement WriteZeroes for QcowFile	2018-09-05 01:25:50 -07:00