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7868f93006
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@nereid.pl>
Signed-off-by: Jan Kara <jack@suse.cz>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.