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由 Jaegeuk Kim 提交于
This patch adds a kernel thread to issue discard commands. It proposes three states, D_PREP, D_SUBMIT, and D_DONE to identify current bio status. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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