From 9a02b7eeeb446a0418ec83afc80eb38bc188f5c8 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@daterainc.com>
Date: Fri, 20 Dec 2013 17:24:46 -0800
Subject: [PATCH] bcache: Remove/fix some header dependencies

In the process of disentagling/libraryizing bset.c from the rest of the
bcache code.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
---
 drivers/md/bcache/bcache.h | 23 ++++++++++++++++++-----
 drivers/md/bcache/bset.h   | 21 ++-------------------
 drivers/md/bcache/util.h   |  6 ++++++
 3 files changed, 26 insertions(+), 24 deletions(-)

diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 25f017248a81..3fd87323368c 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -704,11 +704,6 @@ struct bbio {
 	struct bio		bio;
 };
 
-static inline unsigned local_clock_us(void)
-{
-	return local_clock() >> 10;
-}
-
 #define BTREE_PRIO		USHRT_MAX
 #define INITIAL_PRIO		32768
 
@@ -776,6 +771,24 @@ static inline struct bucket *PTR_BUCKET(struct cache_set *c,
 	return PTR_CACHE(c, k, ptr)->buckets + PTR_BUCKET_NR(c, k, ptr);
 }
 
+static inline uint8_t gen_after(uint8_t a, uint8_t b)
+{
+	uint8_t r = a - b;
+	return r > 128U ? 0 : r;
+}
+
+static inline uint8_t ptr_stale(struct cache_set *c, const struct bkey *k,
+				unsigned i)
+{
+	return gen_after(PTR_BUCKET(c, k, i)->gen, PTR_GEN(k, i));
+}
+
+static inline bool ptr_available(struct cache_set *c, const struct bkey *k,
+				 unsigned i)
+{
+	return (PTR_DEV(k, i) < MAX_CACHES_PER_SET) && PTR_CACHE(c, k, i);
+}
+
 /* Btree key macros */
 
 static inline void bkey_init(struct bkey *k)
diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h
index 1d3c24f9fa0e..ba02f055bc64 100644
--- a/drivers/md/bcache/bset.h
+++ b/drivers/md/bcache/bset.h
@@ -142,6 +142,8 @@
  * first key in that range of bytes again.
  */
 
+struct cache_set;
+
 /* Btree key comparison/iteration */
 
 #define MAX_BSETS		4U
@@ -282,25 +284,6 @@ bool bch_extent_ptr_invalid(struct cache_set *, const struct bkey *);
 
 bool bch_ptr_bad(struct btree *, const struct bkey *);
 
-static inline uint8_t gen_after(uint8_t a, uint8_t b)
-{
-	uint8_t r = a - b;
-	return r > 128U ? 0 : r;
-}
-
-static inline uint8_t ptr_stale(struct cache_set *c, const struct bkey *k,
-				unsigned i)
-{
-	return gen_after(PTR_BUCKET(c, k, i)->gen, PTR_GEN(k, i));
-}
-
-static inline bool ptr_available(struct cache_set *c, const struct bkey *k,
-				 unsigned i)
-{
-	return (PTR_DEV(k, i) < MAX_CACHES_PER_SET) && PTR_CACHE(c, k, i);
-}
-
-
 typedef bool (*ptr_filter_fn)(struct btree *, const struct bkey *);
 
 struct bkey *bch_btree_iter_next(struct btree_iter *);
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 1030c6020e98..3ebaef5f645b 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -2,6 +2,7 @@
 #ifndef _BCACHE_UTIL_H
 #define _BCACHE_UTIL_H
 
+#include <linux/blkdev.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/llist.h>
@@ -391,6 +392,11 @@ struct time_stats {
 
 void bch_time_stats_update(struct time_stats *stats, uint64_t time);
 
+static inline unsigned local_clock_us(void)
+{
+	return local_clock() >> 10;
+}
+
 #define NSEC_PER_ns			1L
 #define NSEC_PER_us			NSEC_PER_USEC
 #define NSEC_PER_ms			NSEC_PER_MSEC