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From: Bart Van Assche <bvanassche@acm.org>
To: Changheun Lee <nanich.lee@samsung.com>,
	hch@infradead.org, Johannes.Thumshirn@wdc.com,
	alex_y_xu@yahoo.ca, asml.silence@gmail.com, axboe@kernel.dk,
	bgoncalv@redhat.com, damien.lemoal@wdc.com,
	gregkh@linuxfoundation.org, jaegeuk@kernel.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	ming.lei@redhat.com, osandov@fb.com, patchwork-bot@kernel.org,
	tj@kernel.org, tom.leiming@gmail.com, yi.zhang@redhat.com
Cc: jisoo2146.oh@samsung.com, junho89.kim@samsung.com,
	mj0123.lee@samsung.com, seunghwan.hyun@samsung.com,
	sookwan7.kim@samsung.com, woosung2.lee@samsung.com,
	yt0928.kim@samsung.com
Subject: Re: [PATCH v11 3/3] scsi: set max_bio_bytes with queue max sectors
Date: Wed, 2 Jun 2021 12:04:04 -0700	[thread overview]
Message-ID: <10c02317-7528-bbad-3cfb-75db54d2ab91@acm.org> (raw)
In-Reply-To: <20210602121037.11083-4-nanich.lee@samsung.com>

On 6/2/21 5:10 AM, Changheun Lee wrote:
> Set max_bio_bytes same with queue max sectors. It will lead to fast bio
> submit when bio size is over than queue max sectors. And it might be helpful
> to align submit bio size in some case.
> 
> Signed-off-by: Changheun Lee <nanich.lee@samsung.com>
> ---
>  drivers/scsi/scsi_lib.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 532304d42f00..f6269268b0e0 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1837,6 +1837,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
>  	blk_queue_virt_boundary(q, shost->virt_boundary_mask);
>  	dma_set_max_seg_size(dev, queue_max_segment_size(q));
>  
> +	blk_queue_max_bio_bytes(q, queue_max_sectors(q));
> +
>  	/*
>  	 * Set a reasonable default alignment:  The larger of 32-byte (dword),
>  	 * which is a common minimum for HBAs, and the minimum DMA alignment,

Has this patch been tested with dm-crypt on top of a SCSI device? I'm
concerned that this patch will trigger data corruption with dm-crypt on
top because the above change will make the following dm-crypt code fail
for a sufficiently large bio:

		bio_add_page(clone, page, len, 0);

When testing dm-crypt on top of this patch series, please change the
above dm-crypt code into the following before running any tests:

		WARN_ON(bio_add_page(clone, page, len, 0) < len);

Thanks,

Bart.

  parent reply	other threads:[~2021-06-02 19:05 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210602122909epcas1p4f4cad512dd31ed9458ca6049c5074b71@epcas1p4.samsung.com>
2021-06-02 12:10 ` [PATCH v11 0/3] bio: control bio max size Changheun Lee
     [not found]   ` <CGME20210602122910epcas1p17ab868175c38cf3f143b64f4ec59f75c@epcas1p1.samsung.com>
2021-06-02 12:10     ` [PATCH v11 1/3] " Changheun Lee
2021-06-02 12:51       ` Damien Le Moal
     [not found]         ` <CGME20210603084659epcas1p1bc7b425e65bdc6517f69cf5a0e0628dc@epcas1p1.samsung.com>
2021-06-03  8:28           ` Changheun Lee
     [not found]   ` <CGME20210602122911epcas1p1c7574ee73f4da9ce17605a78f864ce95@epcas1p1.samsung.com>
2021-06-02 12:10     ` [PATCH v11 2/3] blk-sysfs: add max_bio_bytes Changheun Lee
     [not found]   ` <CGME20210602122912epcas1p4faff714cc9457b0d482fc1a4b63a49a9@epcas1p4.samsung.com>
2021-06-02 12:10     ` [PATCH v11 3/3] scsi: set max_bio_bytes with queue max sectors Changheun Lee
2021-06-02 12:53       ` Damien Le Moal
     [not found]         ` <CGME20210603085107epcas1p223fb68f0d992fd9b64df84d8bcfea1f0@epcas1p2.samsung.com>
2021-06-03  8:32           ` Changheun Lee
     [not found]             ` <CGME20210603130204epcas1p1f33c937feb12b181af0c57f464a19f84@epcas1p1.samsung.com>
2021-06-03 12:43               ` Changheun Lee
2021-06-02 19:04       ` Bart Van Assche [this message]
     [not found]         ` <CGME20210603094700epcas1p3921df0cd92caca7b098205d35d861eb9@epcas1p3.samsung.com>
2021-06-03  9:28           ` Changheun Lee

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