Btrfs: [PATCH] extent_map: add writepage_end_io hook

XFS updates the ondisk inode size only after the data I/O has finished, so it needs a hook when the writepage end_bio handler has finished. Might not be worth applying as-is as the per-page callback is very ineffcient. What XFS really wants is a callback when writeout of a whole extent has completed. This delayed i_size updates scheme might be worthwile for btrfs aswell, btw. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Chris Mason <[email protected]>
mrcsosa · Sep 11, 2007 · 0e2752a · 0e2752a
1 parent b06355f
commit 0e2752a
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diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
@@ -1231,6 +1231,8 @@ static int end_bio_extent_writepage(struct bio *bio,
 			end_page_writeback(page);
 		else
 			check_page_writeback(tree, page);
+		if (tree->ops && tree->ops->writepage_end_io_hook)
+			tree->ops->writepage_end_io_hook(page, start, end);
 	} while (bvec >= bio->bi_io_vec);
 
 	bio_put(bio);

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
@@ -11,6 +11,7 @@ struct extent_map_ops {
 	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
 	int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
 	int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
+	void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
 };
 
 struct extent_map_tree {