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bvec_try_merge_page currently returns if the added page fragment is within the same page as the last page in the last current bio_vec. This information is used by __bio_iov_iter_get_pages so that we always have a single folio pin per page even when the page is split over multiple __bio_iov_iter_get_pages calls. Threading this through the entire lowlevel add page to bio logic is annoying and inefficient and leads to less code sharing than otherwise possible. Instead add code to __bio_iov_iter_get_pages that checks if the bio_vecs did not change and thus a merge into the last segment must have happened, and if there is an offset into the page for the currently added fragment, because if yes we must have already had a previous fragment of the same page in the last bio_vec. While this is still a bit ugly, it keeps the logic in the one place that needs it and allows for more code sharing. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20250512042354.514329-1-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.