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ebdca07268
New on disk format version: backpointers new include the generation number of the bucket they refer to, and the obsolete bucket_offset field (no longer needed because we no longer store backpointers in alloc keys) is gone. This is an expensive forced upgrade - hopefully the last; we have to run the extents_to_backpointers recovery pass to regenerate backpointers. It's a forced incompatible upgrade because the alternative would've been permamently making backpointers bigger, and as one of the biggest btrees (along with the extents btree) that's not an ideal option. It's worth it though, because this allows us to make the check_extents_to_backpointers pass drastically cheaper: an upcoming patch changes it to sum up backpointers in a bucket and check the sum against the sector counts for that bucket, only looking for missing backpointers if they don't match (and then only for specific buckets). Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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 reStructuredText 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.