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-rw-r--r--man/crypttab.xml24
1 files changed, 24 insertions, 0 deletions
diff --git a/man/crypttab.xml b/man/crypttab.xml
index 3e249ad23e..d4ff760adc 100644
--- a/man/crypttab.xml
+++ b/man/crypttab.xml
@@ -146,6 +146,30 @@
</varlistentry>
<varlistentry>
+ <term><option>offset=</option></term>
+
+ <listitem><para>Start offset in the backend device, in 512-byte sectors.
+ This option is only relevant for plain devices.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>skip=</option></term>
+
+ <listitem><para>How many 512-byte sectors of the encrypted data to skip
+ at the beginning. This is different from the <option>--offset</option>
+ option with respect to the sector numbers used in initialization vector
+ (IV) calculation. Using <option>--offset</option> will shift the IV
+ calculation by the same negative amount. Hence, if <option>--offset n</option>,
+ sector n will get a sector number of 0 for the IV calculation.
+ Using <option>--skip</option> causes sector n to also be the first
+ sector of the mapped device, but with its number for IV generation is n.</para>
+
+ <para>This option is only relevant for plain devices.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>keyfile-offset=</option></term>
<listitem><para>Specifies the number of bytes to skip at the