add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/block/bfq-iosched.c
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@@ -373,6 +373,12 @@
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 void bic_set_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq, bool is_sync)
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 {
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+	struct bfq_queue *old_bfqq = bic->bfqq[is_sync];
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+
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+	/* Clear bic pointer if bfqq is detached from this bic */
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+	if (old_bfqq && old_bfqq->bic == bic)
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+		old_bfqq->bic = NULL;
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+
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 	bic->bfqq[is_sync] = bfqq;
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 }
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@@ -2810,7 +2816,7 @@
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 	/*
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 	 * Merge queues (that is, let bic redirect its requests to new_bfqq)
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 	 */
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-	bic_set_bfqq(bic, new_bfqq, 1);
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+	bic_set_bfqq(bic, new_bfqq, true);
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 	bfq_mark_bfqq_coop(new_bfqq);
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 	/*
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 	 * new_bfqq now belongs to at least two bics (it is a shared queue):
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@@ -4974,9 +4980,8 @@
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 		unsigned long flags;
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 		spin_lock_irqsave(&bfqd->lock, flags);
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-		bfqq->bic = NULL;
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-		bfq_exit_bfqq(bfqd, bfqq);
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 		bic_set_bfqq(bic, NULL, is_sync);
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+		bfq_exit_bfqq(bfqd, bfqq);
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 		spin_unlock_irqrestore(&bfqd->lock, flags);
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 	}
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 }
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@@ -5062,9 +5067,11 @@
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 	bfqq = bic_to_bfqq(bic, false);
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 	if (bfqq) {
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-		bfq_release_process_ref(bfqd, bfqq);
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-		bfqq = bfq_get_queue(bfqd, bio, BLK_RW_ASYNC, bic);
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+		struct bfq_queue *old_bfqq = bfqq;
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+
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+		bfqq = bfq_get_queue(bfqd, bio, false, bic);
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 		bic_set_bfqq(bic, bfqq, false);
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+		bfq_release_process_ref(bfqd, old_bfqq);
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 	}
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 	bfqq = bic_to_bfqq(bic, true);
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@@ -6004,7 +6011,7 @@
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 		return bfqq;
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 	}
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-	bic_set_bfqq(bic, NULL, 1);
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+	bic_set_bfqq(bic, NULL, true);
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 	bfq_put_cooperator(bfqq);
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