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block: make dma_alignment a stacking queue_limit

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Device mappers had always been getting the default 511 dma mask, but
the underlying device might have a larger alignment requirement. Since
this value is used to determine alloweable direct-io alignment, this
needs to be a stackable limit.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221110184501.2451620-2-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2022-11-10 10:44:57 -08:00
committed by Jens Axboe
parent a7a1598189
commit c964d62f5c
3 changed files with 13 additions and 11 deletions
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block/blk-core.c
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@@ -425,7 +425,6 @@ struct request_queue *blk_alloc_queue(int node_id, bool alloc_srcu)
PERCPU_REF_INIT_ATOMIC, GFP_KERNEL))
goto fail_stats;
blk_queue_dma_alignment(q, 511);
blk_set_default_limits(&q->limits);
q->nr_requests = BLKDEV_DEFAULT_RQ;