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ef7e7cbb32
Use iomap for dirty folio writeback in ->writepages(). This allows for granular dirty writeback of large folios. Only the dirty portions of the large folio will be written instead of having to write out the entire folio. For example if there is a 1 MB large folio and only 2 bytes in it are dirty, only the page for those dirty bytes will be written out. .dirty_folio needs to be set to iomap_dirty_folio so that the bitmap iomap uses for dirty tracking correctly reflects dirty regions that need to be written back. Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Link: https://lore.kernel.org/20250715202122.2282532-3-joannelkoong@gmail.com Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
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.