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 <[EMAIL PROTECTED]>
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 {
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