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5722bcd7d3Jens Axboe <axboe@kernel.dk> says: As per the thread here: https://lore.kernel.org/linux-fsdevel/20250525083209.GS2023217@ZenIV/ there was an issue with the dropbehind support, and hence it got reverted (effectively) for the 6.15 kernel release. The problem stems from the fact that the folio can get redirtied and/or scheduled for writeback after the initial dropbehind test, and before we have it locked again for invalidation. Patches 1+2 add a generic helper that both the read and write side can use, and which checks for !dirty && !writeback before going ahead with the invalidation. Patch 3 reverts the FOP_DONTCACHE disable, and patches 4 and 5 do a bit of cleanup work to further unify how the read and write side handling works. This can reasonably be considered a 2 part series, as 1-3 fix the issue and could go to stable, while 4-5 just cleanup the code. * patches from https://lore.kernel.org/20250527133255.452431-1-axboe@kernel.dk: mm/filemap: unify dropbehind flag testing and clearing mm/filemap: unify read/write dropbehind naming Revert "Disable FOP_DONTCACHE for now due to bugs" mm/filemap: use filemap_end_dropbehind() for read invalidation mm/filemap: gate dropbehind invalidate on folio !dirty && !writeback Link: https://lore.kernel.org/20250527133255.452431-1-axboe@kernel.dk Signed-off-by: Christian Brauner <brauner@kernel.org> |
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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.