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dm verity: add ignore_zero_blocks feature

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If ignore_zero_blocks is enabled dm-verity will return zeroes for blocks
matching a zero hash without validating the content.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Sami Tolvanen
2015-12-03 14:26:31 +00:00
committed by Mike Snitzer
parent a739ff3f54
commit 0cc37c2df4
4 changed files with 93 additions and 10 deletions
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Documentation/device-mapper/verity.txt
+5
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@@ -79,6 +79,11 @@ restart_on_corruption
not compatible with ignore_corruption and requires user space support to
avoid restart loops.
ignore_zero_blocks
Do not verify blocks that are expected to contain zeroes and always return
zeroes instead. This may be useful if the partition contains unused blocks
that are not guaranteed to contain zeroes.
use_fec_from_device <fec_dev>
Use forward error correction (FEC) to recover from corruption if hash
verification fails. Use encoding data from the specified device. This