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FROMLIST: dm-verity: provide dma_alignment limit in io_hints

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Since Linux v6.1, some filesystems support submitting direct I/O that is
aligned to only dma_alignment instead of the logical_block_size
alignment that was required before.  I/O that is not aligned to the
logical_block_size is difficult to handle in device-mapper targets that
do cryptographic processing of data, as it makes the units of data that
are hashed or encrypted possibly be split across pages, creating rarely
used and rarely tested edge cases.

As such, dm-crypt and dm-integrity have already opted out of this by
setting dma_alignment to 'logical_block_size - 1'.

Although dm-verity does have code that handles these cases (or at least
is intended to do so), supporting direct I/O with such a low amount of
alignment is not really useful on dm-verity devices.  So, opt dm-verity
out of it too so that it's not necessary to handle these edge cases.

Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>

Bug: 330611177
Link: https://lore.kernel.org/r/20240621165922.77672-11-ebiggers@kernel.org
Change-Id: I1cb4661368363af4244376b8ab89ab743f26fa6d
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2024-06-21 10:37:55 -07:00 committed by William McVicker
parent a936860934
commit 901b6a1577
1 changed files with 2 additions and 0 deletions
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2
drivers/md/dm-verity-target.c
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@ -1002,6 +1002,8 @@ static void verity_io_hints(struct dm_target *ti, struct queue_limits *limits)
limits->physical_block_size = 1 << v->data_dev_block_bits;
blk_limits_io_min(limits, limits->logical_block_size);
limits->dma_alignment = limits->logical_block_size - 1;
}
static void verity_dtr(struct dm_target *ti)