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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/md/bcache/journal.h
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@@ -103,6 +103,9 @@
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 /* Embedded in struct cache_set */
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 struct journal {
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 	spinlock_t		lock;
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+	spinlock_t		flush_write_lock;
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+	bool			btree_flushing;
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+	bool			do_reserve;
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 	/* used when waiting because the journal was full */
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 	struct closure_waitlist	wait;
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 	struct closure		io;
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@@ -154,6 +157,8 @@
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 	struct bio_vec		bv[8];
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 };
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+#define BTREE_FLUSH_NR	8
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+
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 #define journal_pin_cmp(c, l, r)				\
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 	(fifo_idx(&(c)->journal.pin, (l)) > fifo_idx(&(c)->journal.pin, (r)))
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@@ -178,5 +183,6 @@
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 void bch_journal_free(struct cache_set *c);
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 int bch_journal_alloc(struct cache_set *c);
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+void bch_journal_space_reserve(struct journal *j);
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 #endif /* _BCACHE_JOURNAL_H */