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When a flush is issued to an RAID array, a child flush IO is created and issued for each member disk in the RAID array. Since commitb75197e86e("md: Remove flush handling"), each child flush IO has been chained with the original bio. As a result, the failure of any child IO could modify the bi_status of the original bio, potentially impacting the upper-layer filesystem. Fix the issue by preventing child flush IO from altering the original bio->bi_status as before. However, this design introduces a known issue: in the event of a power failure, if a flush IO on a member disk fails, the upper layers may not be informed. This issue is not easy to fix and will not be addressed for the time being in this issue. Fixes:b75197e86e("md: Remove flush handling") Signed-off-by: Li Nan <linan122@huawei.com> Reviewed-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240919063048.2887579-1-linan666@huaweicloud.com Signed-off-by: Song Liu <song@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.