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Daniel Verkamp 7621d910f5 devices: block: implement discard and write zeroes 
Discard and Write Zeroes commands have been added to the virtio block
specification:
88c8553838

Implement both commands using the WriteZeroes trait.

BUG=chromium:850998
TEST=fstrim within termina on a writable qcow image

Change-Id: I33e54e303202328c10f7f2d6e69ab19f419f3998
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1188680
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
2018-09-10 13:33:46 -07:00
..
arm devices: block: implement discard and write zeroes 2018-09-10 13:33:46 -07:00
x86_64 devices: block: implement discard and write zeroes 2018-09-10 13:33:46 -07:00