1 files changed, 18 insertions, 5 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)