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This commit reports virtio-blk discarding configuration to user space,includes: 1) the maximum discard sectors 2) maximum number of discard segments for the block driver to use 3) the alignment for splitting a discarding request Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> Message-Id: <20240218185606.13509-8-lingshan.zhu@intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>