Daniel Verkamp 2ea8f3d0aa qcow: scan for free clusters at startup ... During runtime, we track unreferenced clusters (via unref_clusters and avail_clusters) and reuse them before extending the disk image. However, across boots, we did not previously recover the list of unreferenced clusters, so the disk file could grow beyond the range that the reference table count represent. This patch adds a boot-time scan for all unreferenced clusters so that they get reused. BUG=chromium:899273 TEST=Boot with qcow2 image, fill the disk with dd, delete the dd'd file, refill with dd, and so on, repeatedly. Ensure that the disk image does not grow beyond the expected max size and that no clusters beyond the size of the refcount table are used. Change-Id: Idd21b08bb4c55b8244e7ecaccafc4ccc46b7b17a Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1327822 Reviewed-by: Dylan Reid <dgreid@chromium.org>		2018-12-04 00:11:37 -08:00
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src	qcow: scan for free clusters at startup	2018-12-04 00:11:37 -08:00
Cargo.toml	qcow: implement WriteZeroes for QcowFile	2018-09-05 01:25:50 -07:00