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In commit11f4c3a53a, we tried to simplify the extent lookup in xfs_can_free_eofblocks so that it doesn't incur the overhead of all the extra stuff that xfs_bmapi_read does around the iext lookup. Unfortunately, this causes regressions on generic/603, xfs/108, generic/219, xfs/173, generic/694, xfs/052, generic/230, and xfs/441 when always_cow is turned on. In all cases, the regressions take the form of alwayscow files consuming rather more space than the golden output is expecting. I observed that in all these cases, the cause of the excess space usage was due to CoW fork delalloc reservations that go beyond EOF. For alwayscow files we allow posteof delalloc CoW reservations because all writes go through the CoW fork. Recall that all extents in the CoW fork are accounted for via i_delayed_blks, which means that prior to this patch, we'd invoke xfs_free_eofblocks on first close if anything was in the CoW fork. Now we don't do that. Fix the problem by reverting the removal of the i_delayed_blks check. Cc: <stable@vger.kernel.org> # v6.12-rc1 Fixes:11f4c3a53a("xfs: simplify extent lookup in xfs_can_free_eofblocks") 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.