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6c6201278e
Currently inside write_one_eb() we have two different ways of handling subpage and regular metadata. The differences are: - Extra offset/length calculation when adding the folio range to bio for subpage cases - Only decrease wbc->nr_to_write if the whole page is no longer dirty for subpage cases - Use subpage helper for subpage cases Merge the tow ways into a shared one: - Always calculate the to-be-queued range So that bio_add_folio() can use the same calculated resulted length and offset for both cases. - Use btrfs_meta_folio_clear_dirty() and btrfs_meta_folio_set_writeback() helpers This will cover both cases. - Only decrease wbc->nr_to_write if the folio is no longer dirty Since we have the folio locked, no one else can modify the folio dirty flags (set_extent_buffer_dirty() will also lock the folio for subpage cases). Thus after our btrfs_meta_folio_clear_dirty() call, if the whole folio is no longer dirty, we're submitting the last dirty eb of the folio, and can decrease wbc->nr_to_write properly. 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.