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dm-crypt: support relaxed memory alignment #486

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subject: dm-crypt: support relaxed memory alignment
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1042385

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Upstream branch: 944aacb
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@keithbusch @kawasaki
dm-crypt: allow unaligned bio_vecs for direct io
bf59547 
Many storage devices can handle DMA for data that is not aligned to the
sector block size. The block and filesystem layers have introduced
updates to allow that kind of memory alignment flexibility when
possible.

dm-crypt, however, currently constrains itself to aligned memory because
it sends a single scatterlist element for the in/out list to the encrypt
and decrypt algorithms. This forces applications that have unaligned
data to copy through a bounce buffer, increasing CPU and memory
utilization.

Use multiple scatterlist elements to relax the memory alignment
requirement. To keep this simple, this more flexible constraint is
enabled only for certain encryption and initialization vector types,
specifically the ones that don't have additional use for the request
base scatterlist elements beyond holding decrypted data.

Signed-off-by: Keith Busch <[email protected]>
@keithbusch @kawasaki
dm-crypt: dynamic scatterlist for many segments
24ee354 
In the unlikely case where the base bio uses a highly fragmented vector,
the four inline scatterlist elements may not be enough, so allocate a
temporary scatterlist when needed.

Signed-off-by: Keith Busch <[email protected]>
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