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

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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>
This commit is contained in:
Christoph Hellwig 2007-09-10 20:02:32 -04:00 committed by David Woodhouse
parent d396c6f554
commit b06355f0fe
1 changed files with 6 additions and 1 deletions
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7
fs/btrfs/extent_map.c
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@ -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 {