ext4: use unsigned int for es_status values

Don't use an unsigned long long for the es_status flags; this requires
that we pass 64-bit values around which is painful on 32-bit systems.
Instead pass the extent status flags around using the low 4 bits of an
unsigned int, and shift them into place when we are reading or writing
es_pblk.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>

1 files changed, 27 insertions, 20 deletions

diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index e936730cc5b0..d72af848f989 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -29,16 +29,26 @@
 /*
  * 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 ES_SHIFT        60
+
+#define EXTENT_STATUS_WRITTEN   (1 << 3)
+#define EXTENT_STATUS_UNWRITTEN (1 << 2)
+#define EXTENT_STATUS_DELAYED   (1 << 1)
+#define EXTENT_STATUS_HOLE      (1 << 0)
 
 #define EXTENT_STATUS_FLAGS     (EXTENT_STATUS_WRITTEN | \
                                  EXTENT_STATUS_UNWRITTEN | \
                                  EXTENT_STATUS_DELAYED | \
                                  EXTENT_STATUS_HOLE)
 
+#define ES_WRITTEN              (1ULL << 63)
+#define ES_UNWRITTEN            (1ULL << 62)
+#define ES_DELAYED              (1ULL << 61)
+#define ES_HOLE                 (1ULL << 60)
+
+#define ES_MASK                 (ES_WRITTEN | ES_UNWRITTEN | \
+                                 ES_DELAYED | ES_HOLE)
+
 struct ext4_sb_info;
 struct ext4_extent;
 
@@ -60,7 +70,7 @@ 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 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,
@@ -72,32 +82,32 @@ extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);
 
 static inline int ext4_es_is_written(struct extent_status *es)
 {
-        return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
+        return (es->es_pblk & ES_WRITTEN) != 0;
 }
 
 static inline int ext4_es_is_unwritten(struct extent_status *es)
 {
-        return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
+        return (es->es_pblk & ES_UNWRITTEN) != 0;
 }
 
 static inline int ext4_es_is_delayed(struct extent_status *es)
 {
-        return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
+        return (es->es_pblk & ES_DELAYED) != 0;
 }
 
 static inline int ext4_es_is_hole(struct extent_status *es)
 {
-        return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
+        return (es->es_pblk & ES_HOLE) != 0;
 }
 
-static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
+static inline unsigned int ext4_es_status(struct extent_status *es)
 {
-        return (es->es_pblk & EXTENT_STATUS_FLAGS);
+        return es->es_pblk >> ES_SHIFT;
 }
 
 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,
@@ -105,19 +115,16 @@ static inline void ext4_es_store_pblock(struct extent_status *es,
 {
         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;
-
-        block = (status & EXTENT_STATUS_FLAGS) |
-                (es->es_pblk & ~EXTENT_STATUS_FLAGS);
-        es->es_pblk = block;
+        es->es_pblk = (((ext4_fsblk_t)
+                        (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
+                       (es->es_pblk & ~ES_MASK));
 }
 
 extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);