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authorSami Tolvanen <samitolvanen@google.com>2015-12-03 14:26:31 +0000
committerMike Snitzer <snitzer@redhat.com>2015-12-10 10:39:03 -0500
commit0cc37c2df4fa0aa702f9662edce4b7ce12c86b7a (patch)
treece34d33da52e65c3907034f294af01f7dd96ad0b /Documentation/device-mapper
parenta739ff3f543afbb4a041c16cd0182c8e8d366e70 (diff)
dm verity: add ignore_zero_blocks feature
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>
Diffstat (limited to 'Documentation/device-mapper')
-rw-r--r--Documentation/device-mapper/verity.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/device-mapper/verity.txt b/Documentation/device-mapper/verity.txt
index d602c801ff59..89fd8f9a259f 100644
--- a/Documentation/device-mapper/verity.txt
+++ b/Documentation/device-mapper/verity.txt
@@ -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