The mount.storage helper open-codes the conventional 64K UID/GID delegation block size as 0x10000 / 0x10000U in four places. Several other places in the tree do the same (nspawn's arg_uid_range default, homed's mount setup, …), but with no shared name. Add USERNS_RANGE_SIZE in user-util.h alongside UID_NOBODY and friends, and switch storagectl over to it. Other call sites can adopt it incrementally. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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