From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@kernel.dk, kbusch@kernel.org, linux-block@vger.kernel.org,
martin.petersen@oracle.com
Subject: Re: [PATCH] block: require LBA dma_alignment when using PI
Date: Wed, 22 Oct 2025 11:53:16 -0400 [thread overview]
Message-ID: <yq1plaf2at1.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <20251022083335.2147105-1-hch@lst.de> (Christoph Hellwig's message of "Wed, 22 Oct 2025 10:33:31 +0200")
Christoph,
> The block layer PI generation / verification code expects the bio_vecs
> to have at least LBA size (or more correctly integrity internal)
> granularity. With the direct I/O alignment relaxation in 2022, user
> space can now feed bios with less alignment than that, leading to
> scribbling outside the PI buffers. Apparently this wasn't noticed so
> far because none of the tests generate such buffers, but since
> 851c4c96db00 ("xfs: implement XFS_IOC_DIOINFO in terms of
> vfs_getattr"), xfstests generic/013 by default generates such I/O now
> that the relaxed alignment is advertised by the XFS_IOC_DIOINFO ioctl.
>
> Fix this by increasing the required alignment when using PI, although
> handling arbitrary alignment in the long run would be even nicer.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
--
Martin K. Petersen
next prev parent reply other threads:[~2025-10-22 15:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-22 8:33 [PATCH] block: require LBA dma_alignment when using PI Christoph Hellwig
2025-10-22 14:23 ` Keith Busch
2025-10-22 15:53 ` Martin K. Petersen [this message]
2025-10-22 16:03 ` Jens Axboe
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