--- zzzz-none-000/linux-3.10.107/fs/ext4/extents_status.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/ext4/extents_status.h	2021-02-04 17:41:59.000000000 +0000
@@ -29,16 +29,30 @@
 /*
  * These flags live in the high bits of extent_status.es_pblk
  */
-#define EXTENT_STATUS_WRITTEN	(1ULL << 63)
-#define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
-#define EXTENT_STATUS_DELAYED	(1ULL << 61)
-#define EXTENT_STATUS_HOLE	(1ULL << 60)
-
-#define EXTENT_STATUS_FLAGS	(EXTENT_STATUS_WRITTEN | \
-				 EXTENT_STATUS_UNWRITTEN | \
-				 EXTENT_STATUS_DELAYED | \
-				 EXTENT_STATUS_HOLE)
+enum {
+	ES_WRITTEN_B,
+	ES_UNWRITTEN_B,
+	ES_DELAYED_B,
+	ES_HOLE_B,
+	ES_REFERENCED_B,
+	ES_FLAGS
+};
+
+#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
+#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
+
+#define EXTENT_STATUS_WRITTEN	(1 << ES_WRITTEN_B)
+#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
+#define EXTENT_STATUS_DELAYED	(1 << ES_DELAYED_B)
+#define EXTENT_STATUS_HOLE	(1 << ES_HOLE_B)
+#define EXTENT_STATUS_REFERENCED	(1 << ES_REFERENCED_B)
+
+#define ES_TYPE_MASK	((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
+			  EXTENT_STATUS_UNWRITTEN | \
+			  EXTENT_STATUS_DELAYED | \
+			  EXTENT_STATUS_HOLE) << ES_SHIFT)
 
+struct ext4_sb_info;
 struct ext4_extent;
 
 struct extent_status {
@@ -53,13 +67,26 @@
 	struct extent_status *cache_es;	/* recently accessed extent */
 };
 
+struct ext4_es_stats {
+	unsigned long es_stats_shrunk;
+	unsigned long es_stats_cache_hits;
+	unsigned long es_stats_cache_misses;
+	u64 es_stats_scan_time;
+	u64 es_stats_max_scan_time;
+	struct percpu_counter es_stats_all_cnt;
+	struct percpu_counter es_stats_shk_cnt;
+};
+
 extern int __init ext4_init_es(void);
 extern void ext4_exit_es(void);
 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
 
 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
 				 ext4_lblk_t len, ext4_fsblk_t pblk,
-				 unsigned long long status);
+				 unsigned int status);
+extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
+				 ext4_lblk_t len, ext4_fsblk_t pblk,
+				 unsigned int status);
 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
 				 ext4_lblk_t len);
 extern void ext4_es_find_delayed_extent_range(struct inode *inode,
@@ -67,36 +94,55 @@
 					struct extent_status *es);
 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
 				 struct extent_status *es);
-extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);
+
+static inline unsigned int ext4_es_status(struct extent_status *es)
+{
+	return es->es_pblk >> ES_SHIFT;
+}
+
+static inline unsigned int ext4_es_type(struct extent_status *es)
+{
+	return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
+}
 
 static inline int ext4_es_is_written(struct extent_status *es)
 {
-	return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
+	return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
 }
 
 static inline int ext4_es_is_unwritten(struct extent_status *es)
 {
-	return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
+	return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
 }
 
 static inline int ext4_es_is_delayed(struct extent_status *es)
 {
-	return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
+	return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
 }
 
 static inline int ext4_es_is_hole(struct extent_status *es)
 {
-	return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
+	return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
 }
 
-static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
+static inline void ext4_es_set_referenced(struct extent_status *es)
 {
-	return (es->es_pblk & EXTENT_STATUS_FLAGS);
+	es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
+}
+
+static inline void ext4_es_clear_referenced(struct extent_status *es)
+{
+	es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
+}
+
+static inline int ext4_es_is_referenced(struct extent_status *es)
+{
+	return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
 }
 
 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
 {
-	return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
+	return es->es_pblk & ~ES_MASK;
 }
 
 static inline void ext4_es_store_pblock(struct extent_status *es,
@@ -104,24 +150,28 @@
 {
 	ext4_fsblk_t block;
 
-	block = (pb & ~EXTENT_STATUS_FLAGS) |
-		(es->es_pblk & EXTENT_STATUS_FLAGS);
+	block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
 	es->es_pblk = block;
 }
 
 static inline void ext4_es_store_status(struct extent_status *es,
-					unsigned long long status)
+					unsigned int status)
 {
-	ext4_fsblk_t block;
+	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
+		      (es->es_pblk & ~ES_MASK);
+}
 
-	block = (status & EXTENT_STATUS_FLAGS) |
-		(es->es_pblk & ~EXTENT_STATUS_FLAGS);
-	es->es_pblk = block;
+static inline void ext4_es_store_pblock_status(struct extent_status *es,
+					       ext4_fsblk_t pb,
+					       unsigned int status)
+{
+	es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
+		      (pb & ~ES_MASK);
 }
 
-extern void ext4_es_register_shrinker(struct super_block *sb);
-extern void ext4_es_unregister_shrinker(struct super_block *sb);
-extern void ext4_es_lru_add(struct inode *inode);
-extern void ext4_es_lru_del(struct inode *inode);
+extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
+extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
+
+extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
 
 #endif /* _EXT4_EXTENTS_STATUS_H */