Copy include/linux/jbd2.h from Linux v6.18. This header defines the
JBD2 journaling layer interface used by ext4.
Series-to: concept
Cover-letter:
ext4l: Begin an implementation of ext4 based on Linux
U-Boot has long had a solid implementation of ext4. Support for writing
and basic journaling was added as well.
However, there are some missing features. For example, some distros
enable metadata checksums which are not supported. There also also other
features such as fast commit and special feature for small files which
are not currently available.
Linux has the canonical implementation of ext4, so one approach would be
to plumb that code into U-Boot. It is not a small undertaking, since the
existing linux/compat.h has only a small fraction of the required
features.
As a start towards this effort, bring in the entire Linux code,
unmodified.
Note: There are 1000s of checkpatch checks and warnings, plus over 100
errors. These have been left along to reduce the source delta.
END
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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