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Years ago when XFS was thought to be much more simple, we introduced m_ag_maxlevels to specify the maximum btree height of per-AG btrees for a given filesystem mount. Then we observed that inode btrees don't actually have the same height and split that off; and now we have rmap and refcount btrees with much different geometries and separate maxlevels variables. The 'ag' part of the name doesn't make much sense anymore, so rename this to m_alloc_maxlevels to reinforce that this is the maximum height of the *free space* btrees. This sets us up for the next patch, which will add a variable to track the maximum height of all AG btrees. (Also take the opportunity to improve adjacent comments and fix minor style problems.) Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com>
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.