dm crypt: add post iv call to iv generator

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IV (initialisation vector) can in principle depend not only
on sector but also on plaintext data (or other attributes).

Change IV generator interface to work directly with dmreq
structure to allow such dependence in generator.

Also add post() function which is called after the crypto
operation.

This allows tricky modification of decrypted data or IV
internals.

In asynchronous mode the post() can be called after
ctx->sector count was increased so it is needed
to add iv_sector copy directly to dmreq structure.
(N.B. dmreq always include only one sector in scatterlists)

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

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Milan Broz 2011-01-13 19:59:54 +00:00 • committed by Alasdair G Kergon

parent 20c82538e4

commit 2dc5327d3a

1 changed files with 35 additions and 13 deletions

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drivers/md/dm-crypt.c

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