[PATCH v10 04/16] Btrfs: introduce dedup state

[Liu Bo <bo.li.liu@oracle.com>]

This introduces dedup state and relative operations to mark and unmark
the dedup data range, it'll be used in later patches.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/extent_io.c | 14 ++++++++++++++
 fs/btrfs/extent_io.h |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index ae69a00..d51487b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1296,6 +1296,20 @@ int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 				cached_state, mask);
 }
 
+int set_extent_dedup(struct extent_io_tree *tree, u64 start, u64 end,
+		     struct extent_state **cached_state, gfp_t mask)
+{
+	return set_extent_bit(tree, start, end, EXTENT_DEDUP, 0,
+			      cached_state, mask);
+}
+
+int clear_extent_dedup(struct extent_io_tree *tree, u64 start, u64 end,
+			  struct extent_state **cached_state, gfp_t mask)
+{
+	return clear_extent_bit(tree, start, end, EXTENT_DEDUP, 0, 0,
+				cached_state, mask);
+}
+
 /*
  * either insert or lock state struct between start and end use mask to tell
  * us if waiting is desired.
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 58b27e5..897110d 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -20,6 +20,7 @@
 #define EXTENT_NEED_WAIT (1 << 13)
 #define EXTENT_DAMAGED (1 << 14)
 #define EXTENT_NORESERVE (1 << 15)
+#define EXTENT_DEDUP (1 << 16)
 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
 
@@ -226,6 +227,10 @@ int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 			struct extent_state **cached_state, gfp_t mask);
 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 			  struct extent_state **cached_state, gfp_t mask);
+int set_extent_dedup(struct extent_io_tree *tree, u64 start, u64 end,
+		     struct extent_state **cached_state, gfp_t mask);
+int clear_extent_dedup(struct extent_io_tree *tree, u64 start, u64 end,
+		       struct extent_state **cached_state, gfp_t mask);
 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 		   gfp_t mask);
 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
-- 
1.8.1.4