[Btrfs-devel] [PATCH] extent_map: make the writepage_io hook optional

[Christoph Hellwig]

The writepage_io is not mandatory, e.g. my port of xfs to the extent_map
code does not have one for now.  So handle a NULL pointer gracefully
here.


Signed-off-by: Christoph Hellwig <hch at lst.de>

Index: btrfs-9cb5f0f5c713/extent_map.c
===================================================================
--- btrfs-9cb5f0f5c713.orig/extent_map.c	2007-09-02 02:24:10.000000000 +0200
+++ btrfs-9cb5f0f5c713/extent_map.c	2007-09-02 02:25:19.000000000 +0200
@@ -1603,7 +1603,12 @@ int extent_write_full_page(struct extent
 			continue;
 		}
 		clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS);
-		ret = tree->ops->writepage_io_hook(page, cur, cur + iosize - 1);
+		if (tree->ops && tree->ops->writepage_io_hook) {
+			ret = tree->ops->writepage_io_hook(page, cur,
+						cur + iosize - 1);
+		} else {
+			ret = 0;
+		}
 		if (ret)
 			SetPageError(page);
 		else {