blk-crypto: optimize data unit alignment checking

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Avoid the relatively high overhead of constructing and walking per-page
segment bio_vecs for data unit alignment checking by merging the checks
into existing loops.

For hardware support crypto, perform the check in bio_split_io_at, which
already contains a similar alignment check applied for all I/O.  This
means bio-based drivers that do not call bio_split_to_limits, should they
ever grow blk-crypto support, need to implement the check themselves,
just like all other queue limits checks.

For blk-crypto-fallback do it in the encryption/decryption loops.  This
means alignment errors for decryption will only be detected after I/O
has completed, but that seems like a worthwhile trade off.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Christoph Hellwig 2026-01-09 07:07:48 +01:00 • committed by Jens Axboe

parent 3d939695e6

commit 66e5a11d2e

3 changed files with 21 additions and 25 deletions

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15

block/blk-crypto-fallback.c

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22

block/blk-crypto.c

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9

block/blk-merge.c

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