linux-kernel - Re: [PATCH] dm verity: fix unaligned block size

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Message-ID: <YHHv1dn9cP4mO7u+@google.com>
Date:   Sat, 10 Apr 2021 11:35:01 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Snitzer <snitzer@...hat.com>, kernel-team@...roid.com
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH] dm verity: fix unaligned block size

Sorry, this patch is totally wrong. Let me dig out more.

On 04/10, Jaegeuk Kim wrote:
> From: Jaegeuk Kim <jaegeuk@...gle.com>
> 
> When f->roots is 2 and block size is 4096, it will gives unaligned block size
> length in the scsi command like below. Let's allocate dm_bufio to set the block
> size length to match IO chunk size.
> 
> E sd 0    : 0:0:0: [sda] tag#30 request not aligned to the logical block size
> E blk_update_request: I/O error, dev sda, sector 10368424 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
> E device-mapper: verity-fec: 254:8: FEC 9244672: parity read failed (block 18056): -5
> 
> Fixes: ce1cca17381f ("dm verity: fix FEC for RS roots unaligned to block size")
> Cc: stable@...r.kernel.org
> Signed-off-by: Jaegeuk Kim <jaegeuk@...gle.com>
> ---
>  drivers/md/dm-verity-fec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
> index 66f4c6398f67..656238131dd7 100644
> --- a/drivers/md/dm-verity-fec.c
> +++ b/drivers/md/dm-verity-fec.c
> @@ -743,7 +743,7 @@ int verity_fec_ctr(struct dm_verity *v)
>  	}
>  
>  	f->bufio = dm_bufio_client_create(f->dev->bdev,
> -					  f->roots << SECTOR_SHIFT,
> +					  1 << v->data_dev_block_bits,
>  					  1, 0, NULL, NULL);
>  	if (IS_ERR(f->bufio)) {
>  		ti->error = "Cannot initialize FEC bufio client";
> -- 
> 2.31.1.295.g9ea45b61b8-goog