dm-verity: reduce scope of real and wanted digests

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In preparation for supporting interleaved hashing where dm-verity will
need to keep track of the real and wanted digests for multiple data
blocks simultaneously, stop using the want_digest and real_digest fields
of struct dm_verity_io from so many different places.  Specifically:

- Make various functions take want_digest as a parameter rather than
  having it be implicitly passed via the struct dm_verity_io.

- Add a new tmp_digest field, and use this instead of real_digest when
  computing a digest solely for the purpose of immediately checking it.

The result is that real_digest and want_digest are used only by
verity_verify_io().

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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This commit is contained in:

Eric Biggers 2025-10-14 14:16:56 -07:00 • committed by Mikulas Patocka

parent ba0f428c9b

commit 379475dc88

4 changed files with 34 additions and 31 deletions

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21

drivers/md/dm-verity-fec.c

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5

drivers/md/dm-verity-fec.h

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38

drivers/md/dm-verity-target.c

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1

drivers/md/dm-verity.h

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