From: Christoph Hellwig <hch@lst.de>
Date: Tue, 11 Sep 2007 00:02:32 +0000 (-0400)
Subject: Btrfs: [PATCH] extent_map: make the writepage_io hook optional
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=b06355f0fe04a62d08238438654ec453e05304ba;p=linux-edison.git

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

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

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index ff2b1dd25bf..162766773a3 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -1607,7 +1607,12 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
 			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 {