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commit be3f1938d3e6ea8186f0de3dd95245dda4f22c1e upstream. In run_delalloc_nocow(), when the found btrfs_key's offset > cur_offset, it indicates a gap between the current processing region and the next file extent. The original code would directly jump to the "must_cow" label, which increments the slot and forces a fallback to COW. This behavior might skip an extent item and result in an overestimated COW fallback range. This patch modifies the logic so that when a gap is detected: - If no COW range is already being recorded (cow_start is unset), cow_start is set to cur_offset. - cur_offset is then advanced to the beginning of the next extent. - Instead of jumping to "must_cow", control flows directly to "next_slot" so that the same extent item can be reexamined properly. The change ensures that we accurately account for the extent gap and avoid accidentally extending the range that needs to fallback to COW. CC: stable@vger.kernel.org # 6.6+ Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Dave Chen <davechen@synology.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 Restructured Text 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.