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In direct_io_relax mode, there can be shared mmaped files and thus dirty pages in its page cache. Therefore those dirty pages should be written back to backend before direct io to avoid data loss. Signed-off-by: Hao Xu <howeyxu@tencent.com> Reviewed-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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.