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c738866e47
Instead of walking every extent and every backpointer it points to, first sum up backpointers in each bucket and check for mismatches, and only look for missing backpointers if mismatches were detected, and only check extents in those buckets. This is a major fsck scalability improvement, since the two backpointers passes (backpointers -> extents and extents -> backpointers) are the most expensive fsck passes by far. Additionally, to speed up the upgrade for backpointer bucket gens, or in situations when we have to rebuild alloc info, add a special case for when no backpointers are found in a bucket - don't check each individual backpointer (in particular, avoiding the write buffer flushes), just recreate them. 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.