devlink: Add callback to query for snapshot id before snapshot create
To restrict the driver with the snapshot ID selection a new callback is introduced for the driver to get the snapshot ID before creating a new snapshot. This will also allow giving the same ID for multiple snapshots taken of different regions on the same time. Signed-off-by: NAlex Vesker <valex@mellanox.com> Signed-off-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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