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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>