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52ac23b25e
We may want to subdivide a device-dax range into multiple devices so that each can have separate permissions or naming. Reserve 128K of label space by default so we have the capability of making allocation decisions persistent. This reservation is not something we can add later since it would result in the default size of a device-dax range changing between kernel versions. Signed-off-by: Dan Williams <dan.j.williams@intel.com>