btrfs: move extent_range_clear_dirty_for_io() into inode.c

The function is only used inside inode.c by compress_file_range(),
so move it to inode.c and unexport it.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -164,21 +164,6 @@ void __cold extent_buffer_free_cachep(void)
 	kmem_cache_destroy(extent_buffer_cache);
 }
 
-void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
-{
-	unsigned long index = start >> PAGE_SHIFT;
-	unsigned long end_index = end >> PAGE_SHIFT;
-	struct page *page;
-
-	while (index <= end_index) {
-		page = find_get_page(inode->i_mapping, index);
-		BUG_ON(!page); /* Pages should be in the extent_io_tree */
-		clear_page_dirty_for_io(page);
-		put_page(page);
-		index++;
-	}
-}
-
 static void process_one_page(struct btrfs_fs_info *fs_info,
 			     struct page *page, const struct page *locked_page,
 			     unsigned long page_ops, u64 start, u64 end)

fs/btrfs/extent_io.h

@@ -353,7 +353,6 @@ void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
 void set_extent_buffer_dirty(struct extent_buffer *eb);
 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
-void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
 				  const struct page *locked_page,
 				  struct extent_state **cached,

fs/btrfs/inode.c

@@ -867,6 +867,21 @@ static inline void inode_should_defrag(struct btrfs_inode *inode,
 		btrfs_add_inode_defrag(NULL, inode, small_write);
 }
 
+static void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
+{
+	unsigned long index = start >> PAGE_SHIFT;
+	unsigned long end_index = end >> PAGE_SHIFT;
+	struct page *page;
+
+	while (index <= end_index) {
+		page = find_get_page(inode->i_mapping, index);
+		BUG_ON(!page); /* Pages should be in the extent_io_tree */
+		clear_page_dirty_for_io(page);
+		put_page(page);
+		index++;
+	}
+}
+
 /*
  * Work queue call back to started compression on a file and pages.
  *