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Darrick J. Wong
af9f02457f
xfs_bmap_rtalloc initializes the bno_hint variable to NULLRTBLOCK (aka NULLFSBLOCK). If the allocation request is for a file range that's adjacent to an existing mapping, it will then change bno_hint to the blkno hint in the bmalloca structure. In other words, bno_hint is either a rt block number, or it's all 1s. Unfortunately, commitec12f97f1bdidn't take the NULLRTBLOCK state into account, which means that it tries to translate that into a realtime extent number. We then end up with an obnoxiously high rtx number and pointlessly feed that to the near allocator. This often fails and falls back to the by-size allocator. Seeing as we had no locality hint anyway, this is a waste of time. Fix the code to detect a lack of bno_hint correctly. This was detected by running xfs/009 with metadir enabled and a 28k rt extent size. Cc: <stable@vger.kernel.org> # v6.12 Fixes:ec12f97f1b("xfs: make the rtalloc start hint a xfs_rtblock_t") Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
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.