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4d67490498
Don't create discard thread when device doesn't support realtime discard or user specifies nodiscard mount option. Signed-off-by: Fengnan Chang <changfengnan@vivo.com> Signed-off-by: Yangtao Li <frank.li@vivo.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>