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There are some cases where when iomap_read_end() is called, the folio may already have been marked uptodate. For example, if the iomap block needed zeroing, then the folio may have been marked uptodate after the zeroing. iomap_read_end() should unlock the folio instead of calling folio_end_read(), which is how these cases were handled prior to commitf8eaf79406("iomap: simplify ->read_folio_range() error handling for reads"). Calling folio_end_read() on an uptodate folio leads to buggy behavior where marking an already uptodate folio as uptodate will XOR it to be marked nonuptodate. Fixes:f8eaf79406("iomap: simplify ->read_folio_range() error handling for reads") Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Link: https://patch.msgid.link/20251118211111.1027272-2-joannelkoong@gmail.com Tested-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reported-by: Matthew Wilcox (Oracle) <willy@infradead.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.