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The new function, write_one_subpage_eb(), as a subroutine for subpage metadata write, will handle the extent buffer bio submission. The major differences between the new write_one_subpage_eb() and write_one_eb() is: - No page locking When entering write_one_subpage_eb() the page is no longer locked. We only lock the page for its status update, and unlock immediately. Now we completely rely on extent io tree locking. - Extra bitmap update along with page status update Now page dirty and writeback is controlled by btrfs_subpage::dirty_bitmap and btrfs_subpage::writeback_bitmap. They both follow the schema that any sector is dirty/writeback, then the full page gets dirty/writeback. - When to update the nr_written number Now we take a shortcut, if we have cleared the last dirty bit of the page, we update nr_written. This is not completely perfect, but should emulate the old behavior well enough. Signed-off-by: Qu Wenruo <wqu@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 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.