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Ilya Dryomov authored
Add an option to turn off discard and write zeroes offload support to avoid deprovisioning a fully provisioned image. When enabled, discard requests will fail with -EOPNOTSUPP, write zeroes requests will fall back to manually zeroing. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Tested-by: Hitoshi Kamei <hitoshi.kamei.xm@hitachi.com>
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