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This device-mapper target creates a read-only device that transparently validates the data on one underlying device against a pre-generated tree of cryptographic checksums stored on a second device. Two checksum device formats are supported: version 0 which is already shipping in Chromium OS and version 1 which incorporates some improvements. Signed-off-by: Mikulas Patocka <[email protected]> Signed-off-by: Mandeep Singh Baines <[email protected]> Signed-off-by: Will Drewry <[email protected]> Signed-off-by: Elly Jones <[email protected]> Cc: Milan Broz <[email protected]> Cc: Olof Johansson <[email protected]> Cc: Steffen Klassert <[email protected]> Cc: Andrew Morton <[email protected]> Signed-off-by: Alasdair G Kergon <[email protected]>