From 7868f93006ad27c00ecddcc2904118aa705459ca Mon Sep 17 00:00:00 2001 From: Bartosz Taudul Date: Sat, 3 Dec 2022 01:07:24 +0000 Subject: 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 Signed-off-by: Jan Kara --- fs/udf/udf_sb.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index 4fa620543d30..291b56dd011e 100644 --- a/fs/udf/udf_sb.h +++ b/fs/udf/udf_sb.h @@ -6,7 +6,11 @@ #include #include -#define UDF_MAX_READ_VERSION 0x0250 +/* + * Even UDF 2.6 media should have version <= 0x250 but apparently there are + * some broken filesystems with version set to 0x260. Accommodate those. + */ +#define UDF_MAX_READ_VERSION 0x0260 #define UDF_MAX_WRITE_VERSION 0x0201 #define UDF_FLAG_USE_EXTENDED_FE 0 -- cgit v1.2.3