add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-cache-policy-smq.c
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@@ -854,7 +854,13 @@
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 	struct background_tracker *bg_work;
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-	bool migrations_allowed;
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+	bool migrations_allowed:1;
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+
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+	/*
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+	 * If this is set the policy will try and clean the whole cache
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+	 * even if the device is not idle.
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+	 */
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+	bool cleaner:1;
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 };
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 /*----------------------------------------------------------------*/
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@@ -1133,7 +1139,7 @@
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 	 * Cache entries may not be populated.  So we cannot rely on the
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 	 * size of the clean queue.
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 	 */
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-	if (idle) {
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+	if (idle || mq->cleaner) {
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 		/*
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 		 * We'd like to clean everything.
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 		 */
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@@ -1716,11 +1722,9 @@
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 		*hotspot_block_size /= 2u;
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 }
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-static struct dm_cache_policy *__smq_create(dm_cblock_t cache_size,
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-					    sector_t origin_size,
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-					    sector_t cache_block_size,
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-					    bool mimic_mq,
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-					    bool migrations_allowed)
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+static struct dm_cache_policy *
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+__smq_create(dm_cblock_t cache_size, sector_t origin_size, sector_t cache_block_size,
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+	     bool mimic_mq, bool migrations_allowed, bool cleaner)
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 {
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 	unsigned i;
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 	unsigned nr_sentinels_per_queue = 2u * NR_CACHE_LEVELS;
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@@ -1807,6 +1811,7 @@
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 		goto bad_btracker;
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 	mq->migrations_allowed = migrations_allowed;
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+	mq->cleaner = cleaner;
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 	return &mq->policy;
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@@ -1830,21 +1835,24 @@
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 					  sector_t origin_size,
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 					  sector_t cache_block_size)
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 {
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-	return __smq_create(cache_size, origin_size, cache_block_size, false, true);
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+	return __smq_create(cache_size, origin_size, cache_block_size,
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+			    false, true, false);
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 }
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 static struct dm_cache_policy *mq_create(dm_cblock_t cache_size,
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 					 sector_t origin_size,
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 					 sector_t cache_block_size)
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 {
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-	return __smq_create(cache_size, origin_size, cache_block_size, true, true);
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+	return __smq_create(cache_size, origin_size, cache_block_size,
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+			    true, true, false);
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 }
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 static struct dm_cache_policy *cleaner_create(dm_cblock_t cache_size,
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 					      sector_t origin_size,
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 					      sector_t cache_block_size)
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 {
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-	return __smq_create(cache_size, origin_size, cache_block_size, false, false);
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+	return __smq_create(cache_size, origin_size, cache_block_size,
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+			    false, false, true);
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 }
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 /*----------------------------------------------------------------*/