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由 Alasdair G Kergon 提交于
The snapshot and origin targets are incapable of handling barriers and need to indicate this. Signed-off-by: NAlasdair G Kergon <agk@redhat.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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