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From: Eric Biggers <ebiggers@kernel.org>
To: Satya Tangirala <satyat@google.com>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH v2 8/8] block: add WARN() in bio_split() for sector alignment
Date: Thu, 15 Apr 2021 13:00:27 -0700	[thread overview]
Message-ID: <YHibW4ndl4sQRkC2@gmail.com> (raw)
In-Reply-To: <20210325212609.492188-9-satyat@google.com>

On Thu, Mar 25, 2021 at 09:26:09PM +0000, Satya Tangirala wrote:
> The number of sectors passed to bio_split() should be aligned to
> bio_required_sector_alignment(). All callers (other than bounce.c) have
> been updated to ensure this, so add a WARN() if the number of sectors is
> not aligned. (bounce.c was not updated since it's legacy code that
> won't interact with inline encryption).

What does bounce.c "won't interact with inline encryption" mean, exactly?
Devices that enable bounce buffering won't declare inline encryption support, so
bounce.c will never see a bio that has an encryption context?

> diff --git a/block/bio.c b/block/bio.c
> index 26b7f721cda8..cb348f134a15 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -1458,6 +1458,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
>  
>  	BUG_ON(sectors <= 0);
>  	BUG_ON(sectors >= bio_sectors(bio));
> +	WARN_ON(!IS_ALIGNED(sectors, bio_required_sector_alignment(bio)));

If this warning triggers, shouldn't the function return NULL to indicate a
failure rather than proceeding on?

- Eric

  parent reply	other threads:[~2021-04-15 20:00 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25 21:26 [PATCH v2 0/8] ensure bios aren't split in middle of crypto data unit Satya Tangirala
2021-03-25 21:26 ` [PATCH v2 1/8] block: introduce blk_ksm_is_empty() Satya Tangirala
2021-03-30 18:04   ` Christoph Hellwig
2021-04-15 19:21   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 2/8] dm,mmc,ufshcd: handle error from blk_ksm_register() Satya Tangirala
2021-04-15 19:27   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 3/8] block: blk-crypto: introduce blk_crypto_bio_sectors_alignment() Satya Tangirala
2021-04-15 19:33   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 4/8] block: introduce bio_required_sector_alignment() Satya Tangirala
2021-03-30 18:06   ` Christoph Hellwig
2021-04-15 19:37     ` Eric Biggers
2021-04-15 19:44   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 5/8] block: respect bio_required_sector_alignment() in blk-crypto-fallback Satya Tangirala
2021-04-15 19:45   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 6/8] block: keyslot-manager: introduce blk_ksm_restrict_dus_to_queue_limits() Satya Tangirala
2021-03-26  3:50   ` kernel test robot
2021-03-26  6:28   ` kernel test robot
2021-04-15 19:55   ` Eric Biggers
2021-03-25 21:26 ` [PATCH v2 7/8] blk-merge: Ensure bios aren't split in middle of a crypto data unit Satya Tangirala
2021-03-25 21:26 ` [PATCH v2 8/8] block: add WARN() in bio_split() for sector alignment Satya Tangirala
2021-03-26  3:47   ` Bart Van Assche
2021-04-15 20:00   ` Eric Biggers [this message]
2021-03-25 21:51 ` [PATCH v2 0/8] ensure bios aren't split in middle of crypto data unit Bart Van Assche
2021-03-26  1:39   ` Satya Tangirala
2021-03-26  3:46     ` Bart Van Assche
2021-03-26  7:56       ` Satya Tangirala

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