ext4: let fallocate handle inline data correctly

If we are punching hole in a file, we will return ENOTSUPP.
As for the fallocation of some extents, we will convert the
inline data to a normal extent based file first.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 1a71a97..4222388 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -192,6 +192,7 @@
 					 int needed);
 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
 
+extern int ext4_convert_inline_data(struct inode *inode);
 # else  /* CONFIG_EXT4_FS_XATTR */
 
 static inline int
@@ -420,6 +421,10 @@
 	return;
 }
 
+static inline int ext4_convert_inline_data(struct inode *inode)
+{
+	return 0;
+}
 # endif  /* CONFIG_EXT4_FS_XATTR */
 
 #ifdef CONFIG_EXT4_FS_SECURITY