From b06355f0fe04a62d08238438654ec453e05304ba Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 10 Sep 2007 20:02:32 -0400 Subject: 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 Signed-off-by: Chris Mason --- fs/btrfs/extent_map.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/btrfs') 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 { -- cgit v1.2.3