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Each device address region can store multiple snapshots, each snapshot is identified using a different numerical ID. This ID is used when deleting a snapshot or showing an address region specific snapshot. This patch exposes a callback to add a new snapshot to an address region. The snapshot will be deleted using the destructor function when destroying a region or when a snapshot delete command from devlink user tool. Signed-off-by: Alex Vesker <valex@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>