linux-kernel - Re: [PATCH] udf: Increase UDF_MAX_READ

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Date:   Mon, 5 Dec 2022 11:51:43 +0100
From:   Jan Kara <jack@...e.cz>
To:     Bartosz Taudul <wolf@...eid.pl>
Cc:     Jan Kara <jack@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] udf: Increase UDF_MAX_READ_VERSION to 0x0260

On Sat 03-12-22 01:07:24, Bartosz Taudul wrote:
> Some discs containing the UDF file system are unable to be mounted,
> failing with the following message:
> 
>   UDF-fs: error (device sr0): udf_fill_super: minUDFReadRev=260
>     (max is 250)
> 
> The UDF 2.60 specification [0] states in the section Basic Restrictions
> & Requirements (page 10):
> 
>   The Minimum UDF Read Revision value shall be at most #0250 for all
>   media with a UDF 2.60 file system. This indicates that a UDF 2.50
>   implementation can read all UDF 2.60 media. Media that do not have a
>   Metadata Partition may use a value lower than #250.
> 
> The conclusion is that the discs failing to mount were burned with a
> faulty software, which didn't follow the specification. This can be
> worked around by increasing UDF_MAX_READ_VERSION to 0x260, to match the
> Minimum Read Revision. No other changes are required, as reading UDF
> 2.60 is backward compatible with UDF 2.50.
> 
> [0] http://www.osta.org/specs/pdf/udf260.pdf
> 
> Signed-off-by: Bartosz Taudul <wolf@...eid.pl>

Yeah, thanks for the patch. I've merged it into my tree.

								Honza

> ---
>  fs/udf/
> udf_sb.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
> index 4fa620543d30..09d62bf1f5fb 100644
> --- a/fs/udf/udf_sb.h
> +++ b/fs/udf/udf_sb.h
> @@ -6,7 +6,7 @@
>  #include <linux/bitops.h>
>  #include <linux/magic.h>
> 
> -#define UDF_MAX_READ_VERSION		0x0250
> +#define UDF_MAX_READ_VERSION		0x0260
>  #define UDF_MAX_WRITE_VERSION		0x0201
> 
>  #define UDF_FLAG_USE_EXTENDED_FE	0
> --
> 2.38.1
> 


-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR