From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Keith Busch <kbusch@kernel.org>
Cc: Keith Busch <kbusch@meta.com>,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, snitzer@kernel.org,
axboe@kernel.dk, dw@davidwei.uk, brauner@kernel.org,
Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCHv2 1/7] block: check for valid bio while splitting
Date: Wed, 13 Aug 2025 17:23:47 -0400 [thread overview]
Message-ID: <yq11ppf2bnf.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <aJzwO9dYeBQAHnCC@kbusch-mbp> (Keith Busch's message of "Wed, 13 Aug 2025 14:06:19 -0600")
Hi Keith!
> NVMe wants this check to actually be this:
>
> if ((bv.bv_offset | bv.bv_len) & lim->dma_alignment)
>
> because the dma alignment defines not only the starting address offset,
> but also the length. NVMe's default alignment is 4 bytes.
dma_alignment defines the alignment of the DMA starting address. We
don't have a dedicated queue limit for the transfer length granularity
described by NVMe.
--
Martin K. Petersen
next prev parent reply other threads:[~2025-08-13 21:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-05 14:11 [PATCHv2 0/7] direct-io: even more flexible io vectors Keith Busch
2025-08-05 14:11 ` [PATCHv2 1/7] block: check for valid bio while splitting Keith Busch
2025-08-10 14:37 ` Christoph Hellwig
2025-08-10 15:39 ` Keith Busch
2025-08-10 17:14 ` Christoph Hellwig
2025-08-13 20:06 ` Keith Busch
2025-08-13 20:41 ` Bart Van Assche
2025-08-13 21:01 ` Keith Busch
2025-08-13 23:17 ` Bart Van Assche
2025-08-14 1:42 ` Damien Le Moal
2025-08-13 21:23 ` Martin K. Petersen [this message]
2025-08-13 21:52 ` Keith Busch
2025-08-18 4:49 ` Christoph Hellwig
2025-08-05 14:11 ` [PATCHv2 2/7] block: align the bio after building it Keith Busch
2025-08-06 6:07 ` Hannes Reinecke
2025-08-10 14:43 ` Christoph Hellwig
2025-08-05 14:11 ` [PATCHv2 3/7] block: simplify direct io validity check Keith Busch
2025-08-05 14:11 ` [PATCHv2 4/7] iomap: " Keith Busch
2025-08-06 6:07 ` Hannes Reinecke
2025-08-05 14:11 ` [PATCHv2 5/7] block: remove bdev_iter_is_aligned Keith Busch
2025-08-05 14:11 ` [PATCHv2 6/7] blk-integrity: use simpler alignment check Keith Busch
2025-08-05 14:11 ` [PATCHv2 7/7] iov_iter: remove iov_iter_is_aligned Keith Busch
2025-08-06 6:08 ` Hannes Reinecke
2025-08-06 3:03 ` [PATCHv2 0/7] direct-io: even more flexible io vectors Martin K. Petersen
2025-08-06 14:51 ` Christoph Hellwig
2025-08-07 23:20 ` Keith Busch
2025-08-11 10:32 ` Christoph Hellwig
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