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ce4a71ee15
The member btrfs_fs_info::subpage_info stores the cached bitmap start position inside the merged bitmap. However in reality there is only one thing depending on the sectorsize, bitmap_nr_bits, which records the number of sectors that fit inside a page. The sequence of sub-bitmaps have fixed order, thus it's just a quick multiplication to calculate the start position of each sub-bitmaps. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.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 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.