Btrfs: Avoid memcpy where possible in extent_buffers

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 895789039ddd..3b3abf34c403 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -62,14 +62,13 @@ struct extent_state {
         struct list_head list;
 };
 
-#define EXTENT_BUFFER_SIZE(nr) (sizeof(struct extent_buffer) + \
-                               (nr - 1) * sizeof(struct page *))
 struct extent_buffer {
         u64 start;
         unsigned long len;
         atomic_t refs;
         int flags;
-        struct page *pages[];
+        struct list_head list;
+        struct page *first_page;
 };
 
 typedef struct extent_map *(get_extent_t)(struct inode *inode,