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[ Upstream commit71f2c82062] Commit3c62be17d4("f2fs: support multiple devices") missed to support direct IO for multiple device feature, this patch adds to support the missing part of multidevice feature. In addition, for multiple device image, we should be aware of any issued direct write IO rather than just buffered write IO, so that fsync and syncfs can issue a preflush command to the device where direct write IO goes, to persist user data for posix compliant. Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Stable-dep-of: fd244524c2cf ("f2fs: compress: fix to cover normal cluster write with cp_rwsem") Signed-off-by: Sasha Levin <sashal@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 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.