linux-kernel - [PATCH] udf: Increase UDF_MAX_READ

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Date:   Sat, 03 Dec 2022 01:07:24 +0000
From:   Bartosz Taudul <wolf@...eid.pl>
To:     Jan Kara <jack@...e.com>
Cc:     linux-kernel@...r.kernel.org, Bartosz Taudul <wolf@...eid.pl>
Subject: [PATCH] udf: Increase UDF_MAX_READ_VERSION to 0x0260

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>
---
 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

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