Btrfs: delay commits during fsync to allow more writers

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 6bce46b..f446f16 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -25,6 +25,11 @@
 	struct btrfs_block_group_cache *block_group;
 	struct btrfs_key location;
 	struct inode vfs_inode;
+
+	/*
+	 * transid of the trans_handle that last modified this inode
+	 */
+	u64 last_trans;
 };
 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 {