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From: Bart Van Assche <bvanassche@acm.org>
To: Mikulas Patocka <mpatocka@redhat.com>,
	Milan Broz <gmazyland@gmail.com>, Theodore Ts'o <tytso@mit.edu>,
	Changheun Lee <nanich.lee@samsung.com>
Cc: alex_y_xu@yahoo.ca, axboe@kernel.dk, bgoncalv@redhat.com,
	dm-crypt@saout.de, hch@lst.de, jaegeuk@kernel.org,
	linux-block@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
	ming.lei@redhat.com, yi.zhang@redhat.com, dm-devel@redhat.com
Subject: Re: regression: data corruption with ext4 on LUKS on nvme with torvalds master
Date: Thu, 13 May 2021 14:18:14 -0700	[thread overview]
Message-ID: <fdee795d-7a4b-9506-b9ca-359b9bcbec34@acm.org> (raw)
In-Reply-To: <alpine.LRH.2.02.2105131510330.21927@file01.intranet.prod.int.rdu2.redhat.com>

On 5/13/21 12:22 PM, Mikulas Patocka wrote:
> We already had problems with too large bios in dm-crypt and we fixed it by 
> adding this piece of code:
> 
>         /*
>          * Check if bio is too large, split as needed.
>          */
>         if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_VECS << PAGE_SHIFT)) &&
>             (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size))
>                 dm_accept_partial_bio(bio, ((BIO_MAX_VECS << PAGE_SHIFT) >> SECTOR_SHIFT));
> 
> It will ask the device mapper to split the bio if it is too large. So, 
> crypt_alloc_buffer can't receive a bio that is larger than BIO_MAX_VECS << 
> PAGE_SHIFT.

Hi Mikulas,

Are you perhaps referring to commit 4e870e948fba ("dm crypt: fix error
with too large bios")? Did that commit go upstream before multi-page
bvec support? Can larger bios be supported in case of two or more
contiguous pages now that multi-page bvec support is upstream?

Thanks,

Bart.

  reply	other threads:[~2021-05-13 21:18 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210513100034epcas1p4b23892cd77bde73c777eea6dc51c16a4@epcas1p4.samsung.com>
2021-05-13  9:42 ` regression: data corruption with ext4 on LUKS on nvme with torvalds master Changheun Lee
2021-05-13 14:15   ` Theodore Ts'o
2021-05-13 15:59     ` Bart Van Assche
     [not found]       ` <0e7b0b6e-e78c-f22d-af8d-d7bdcb597bea@gmail.com>
2021-05-13 19:22         ` Mikulas Patocka
2021-05-13 21:18           ` Bart Van Assche [this message]
2021-05-14  9:43             ` Mikulas Patocka
2021-05-14  9:50           ` Mikulas Patocka
     [not found]             ` <CGME20210514104426epcas1p3ee2f22f8e18c961118795c356e6a14ae@epcas1p3.samsung.com>
2021-05-14 10:26               ` Changheun Lee
2021-07-09 20:45                 ` Samuel Mendoza-Jonas
     [not found] <1620493841.bxdq8r5haw.none.ref@localhost>
2021-05-08 17:54 ` Alex Xu (Hello71)
2021-05-09  2:29   ` Alex Xu (Hello71)
2021-05-09  3:51     ` Jens Axboe
2021-05-09 14:47       ` Alex Xu (Hello71)

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