add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-verity-target.c
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@@ -482,7 +482,7 @@
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 		sector_t cur_block = io->block + b;
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 		struct ahash_request *req = verity_io_hash_req(v, io);
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-		if (v->validated_blocks &&
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+		if (v->validated_blocks && bio->bi_status == BLK_STS_OK &&
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 		    likely(test_bit(cur_block, v->validated_blocks))) {
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 			verity_bv_skip_block(v, io, &io->iter);
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 			continue;
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@@ -538,7 +538,7 @@
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 				return -EIO;
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 			}
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 			if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA,
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-					   cur_block))
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+					      cur_block))
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 				return -EIO;
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 		}
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 	}
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@@ -1219,8 +1219,16 @@
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 		goto bad;
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 	}
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-	/* WQ_UNBOUND greatly improves performance when running on ramdisk */
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-	v->verify_wq = alloc_workqueue("kverityd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus());
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+	/*
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+	 * Using WQ_HIGHPRI improves throughput and completion latency by
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+	 * reducing wait times when reading from a dm-verity device.
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+	 *
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+	 * Also as required for the "try_verify_in_tasklet" feature: WQ_HIGHPRI
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+	 * allows verify_wq to preempt softirq since verification in tasklet
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+	 * will fall-back to using it for error handling (or if the bufio cache
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+	 * doesn't have required hashes).
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+	 */
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+	v->verify_wq = alloc_workqueue("kverityd", WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
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 	if (!v->verify_wq) {
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 		ti->error = "Cannot allocate workqueue";
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 		r = -ENOMEM;