block: stack unplug
MD raid1 prepares to dispatch request in unplug callback. If make_request in low level queue also uses unplug callback to dispatch request, the low level queue's unplug callback will not be called. Recheck the callback list helps this case. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -2913,17 +2913,16 @@ static void flush_plug_callbacks(struct blk_plug *plug)
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{
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{
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LIST_HEAD(callbacks);
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LIST_HEAD(callbacks);
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if (list_empty(&plug->cb_list))
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while (!list_empty(&plug->cb_list)) {
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return;
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list_splice_init(&plug->cb_list, &callbacks);
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list_splice_init(&plug->cb_list, &callbacks);
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while (!list_empty(&callbacks)) {
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struct blk_plug_cb *cb = list_first_entry(&callbacks,
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while (!list_empty(&callbacks)) {
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struct blk_plug_cb *cb = list_first_entry(&callbacks,
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struct blk_plug_cb,
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struct blk_plug_cb,
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list);
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list);
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list_del(&cb->list);
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list_del(&cb->list);
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cb->callback(cb);
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cb->callback(cb);
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}
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}
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}
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}
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}
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