修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/drivers/md/bcache/bcache.h
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@@ -176,7 +176,7 @@
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  * - updates to non leaf nodes just happen synchronously (see btree_split()).
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  */
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-#define pr_fmt(fmt) "bcache: %s() " fmt "\n", __func__
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+#define pr_fmt(fmt) "bcache: %s() " fmt, __func__
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 #include <linux/bcache.h>
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 #include <linux/bio.h>
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@@ -301,6 +301,7 @@
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 	struct block_device	*bdev;
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 	struct cache_sb		sb;
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+	struct cache_sb_disk	*sb_disk;
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 	struct bio		sb_bio;
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 	struct bio_vec		sb_bv[1];
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 	struct closure		sb_write;
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@@ -406,6 +407,7 @@
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 struct cache {
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 	struct cache_set	*set;
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 	struct cache_sb		sb;
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+	struct cache_sb_disk	*sb_disk;
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 	struct bio		sb_bio;
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 	struct bio_vec		sb_bv[1];
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@@ -515,11 +517,7 @@
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 	atomic_t		idle_counter;
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 	atomic_t		at_max_writeback_rate;
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-	struct cache_sb		sb;
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-
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-	struct cache		*cache[MAX_CACHES_PER_SET];
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-	struct cache		*cache_by_alloc[MAX_CACHES_PER_SET];
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-	int			caches_loaded;
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+	struct cache		*cache;
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 	struct bcache_device	**devices;
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 	unsigned int		devices_max_used;
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@@ -631,6 +629,20 @@
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 	struct bkey		gc_done;
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 	/*
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+	 * For automatical garbage collection after writeback completed, this
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+	 * varialbe is used as bit fields,
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+	 * - 0000 0001b (BCH_ENABLE_AUTO_GC): enable gc after writeback
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+	 * - 0000 0010b (BCH_DO_AUTO_GC):     do gc after writeback
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+	 * This is an optimization for following write request after writeback
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+	 * finished, but read hit rate dropped due to clean data on cache is
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+	 * discarded. Unless user explicitly sets it via sysfs, it won't be
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+	 * enabled.
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+	 */
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+#define BCH_ENABLE_AUTO_GC	1
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+#define BCH_DO_AUTO_GC		2
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+	uint8_t			gc_after_writeback;
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+
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+	/*
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 	 * The allocation code needs gc_mark in struct bucket to be correct, but
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 	 * it's not while a gc is in progress. Protected by bucket_lock.
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 	 */
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@@ -654,6 +666,7 @@
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 	struct mutex		verify_lock;
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 #endif
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+	uint8_t			set_uuid[16];
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 	unsigned int		nr_uuids;
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 	struct uuid_entry	*uuids;
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 	BKEY_PADDED(uuid_bucket);
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@@ -662,7 +675,11 @@
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 	/*
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 	 * A btree node on disk could have too many bsets for an iterator to fit
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-	 * on the stack - have to dynamically allocate them
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+	 * on the stack - have to dynamically allocate them.
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+	 * bch_cache_set_alloc() will make sure the pool can allocate iterators
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+	 * equipped with enough room that can host
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+	 *     (sb.bucket_size / sb.block_size)
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+	 * btree_iter_sets, which is more than static MAX_BSETS.
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 	 */
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 	mempool_t		fill_iter;
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@@ -691,8 +708,8 @@
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 	atomic_long_t		writeback_keys_failed;
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 	atomic_long_t		reclaim;
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+	atomic_long_t		reclaimed_journal_buckets;
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 	atomic_long_t		flush_write;
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-	atomic_long_t		retry_flush_write;
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 	enum			{
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 		ON_ERROR_UNREGISTER,
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@@ -709,6 +726,7 @@
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 	unsigned int		gc_always_rewrite:1;
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 	unsigned int		shrinker_disabled:1;
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 	unsigned int		copy_gc_enabled:1;
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+	unsigned int		idle_max_writeback_rate_enabled:1;
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 #define BUCKET_HASH_BITS	12
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 	struct hlist_head	bucket_hash[1 << BUCKET_HASH_BITS];
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@@ -737,15 +755,35 @@
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 #define btree_default_blocks(c)						\
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 	((unsigned int) ((PAGE_SECTORS * (c)->btree_pages) >> (c)->block_bits))
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-#define bucket_pages(c)		((c)->sb.bucket_size / PAGE_SECTORS)
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-#define bucket_bytes(c)		((c)->sb.bucket_size << 9)
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-#define block_bytes(c)		((c)->sb.block_size << 9)
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+#define bucket_bytes(ca)	((ca)->sb.bucket_size << 9)
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+#define block_bytes(ca)		((ca)->sb.block_size << 9)
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-#define prios_per_bucket(c)				\
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-	((bucket_bytes(c) - sizeof(struct prio_set)) /	\
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+static inline unsigned int meta_bucket_pages(struct cache_sb *sb)
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+{
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+	unsigned int n, max_pages;
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+
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+	max_pages = min_t(unsigned int,
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+			  __rounddown_pow_of_two(USHRT_MAX) / PAGE_SECTORS,
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+			  MAX_ORDER_NR_PAGES);
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+
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+	n = sb->bucket_size / PAGE_SECTORS;
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+	if (n > max_pages)
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+		n = max_pages;
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+
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+	return n;
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+}
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+
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+static inline unsigned int meta_bucket_bytes(struct cache_sb *sb)
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+{
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+	return meta_bucket_pages(sb) << PAGE_SHIFT;
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+}
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+
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+#define prios_per_bucket(ca)						\
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+	((meta_bucket_bytes(&(ca)->sb) - sizeof(struct prio_set)) /	\
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 	 sizeof(struct bucket_disk))
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-#define prio_buckets(c)					\
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-	DIV_ROUND_UP((size_t) (c)->sb.nbuckets, prios_per_bucket(c))
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+
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+#define prio_buckets(ca)						\
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+	DIV_ROUND_UP((size_t) (ca)->sb.nbuckets, prios_per_bucket(ca))
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 static inline size_t sector_to_bucket(struct cache_set *c, sector_t s)
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 {
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@@ -759,14 +797,14 @@
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 static inline sector_t bucket_remainder(struct cache_set *c, sector_t s)
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 {
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-	return s & (c->sb.bucket_size - 1);
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+	return s & (c->cache->sb.bucket_size - 1);
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 }
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 static inline struct cache *PTR_CACHE(struct cache_set *c,
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 				      const struct bkey *k,
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 				      unsigned int ptr)
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 {
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-	return c->cache[PTR_DEV(k, ptr)];
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+	return c->cache;
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 }
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 static inline size_t PTR_BUCKET_NR(struct cache_set *c,
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@@ -847,9 +885,6 @@
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 /* Looping macros */
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-#define for_each_cache(ca, cs, iter)					\
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-	for (iter = 0; ca = cs->cache[iter], iter < (cs)->sb.nr_in_set; iter++)
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-
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 #define for_each_bucket(b, ca)						\
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 	for (b = (ca)->buckets + (ca)->sb.first_bucket;			\
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 	     b < (ca)->buckets + (ca)->sb.nbuckets; b++)
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@@ -891,11 +926,9 @@
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 static inline void wake_up_allocators(struct cache_set *c)
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 {
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-	struct cache *ca;
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-	unsigned int i;
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+	struct cache *ca = c->cache;
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-	for_each_cache(ca, c, i)
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-		wake_up_process(ca->alloc_thread);
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+	wake_up_process(ca->alloc_thread);
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 }
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 static inline void closure_bio_submit(struct cache_set *c,
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@@ -908,7 +941,7 @@
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 		bio_endio(bio);
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 		return;
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 	}
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-	generic_make_request(bio);
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+	submit_bio_noacct(bio);
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 }
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 /*
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@@ -952,9 +985,9 @@
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 long bch_bucket_alloc(struct cache *ca, unsigned int reserve, bool wait);
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 int __bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
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-			   struct bkey *k, int n, bool wait);
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+			   struct bkey *k, bool wait);
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 int bch_bucket_alloc_set(struct cache_set *c, unsigned int reserve,
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-			 struct bkey *k, int n, bool wait);
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+			 struct bkey *k, bool wait);
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 bool bch_alloc_sectors(struct cache_set *c, struct bkey *k,
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 		       unsigned int sectors, unsigned int write_point,
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 		       unsigned int write_prio, bool wait);
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@@ -968,6 +1001,7 @@
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 extern struct workqueue_struct *bcache_wq;
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 extern struct workqueue_struct *bch_journal_wq;
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+extern struct workqueue_struct *bch_flush_wq;
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 extern struct mutex bch_register_lock;
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 extern struct list_head bch_cache_sets;
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@@ -990,7 +1024,7 @@
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 int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
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 			  uint8_t *set_uuid);
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 void bch_cached_dev_detach(struct cached_dev *dc);
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-void bch_cached_dev_run(struct cached_dev *dc);
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+int bch_cached_dev_run(struct cached_dev *dc);
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 void bcache_device_stop(struct bcache_device *d);
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 void bch_cache_set_unregister(struct cache_set *c);
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@@ -1006,8 +1040,10 @@
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 int bch_cache_allocator_start(struct cache *ca);
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 void bch_debug_exit(void);
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-void bch_debug_init(struct kobject *kobj);
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+void bch_debug_init(void);
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 void bch_request_exit(void);
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 int bch_request_init(void);
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+void bch_btree_exit(void);
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+int bch_btree_init(void);
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 #endif /* _BCACHE_H */