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In the next patch, the rmap btree repair code will need to estimate the size of the new ondisk rmapbt. The size is a function of the number of records that will be written to disk, and the size of the recordset is the number of observations made while scanning the filesystem plus the number of OWN_AG records that will be injected into the rmap btree. OWN_AG rmap records track the free space btrees, the AGFL, and the new rmap btree itself. The repair tool uses a bitmap to record the space used for all four structures, which is why we need a function to count the number of set regions. A reviewer requested that this be pulled into a separate patch with its own justification, so here it is. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
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.