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Commit 0e2752a7 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David Woodhouse
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent b06355f0

fs/btrfs/extent_map.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

fs/btrfs/extent_map.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {