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Commit 39bab87b authored by Wang Sheng-Hui's avatar Wang Sheng-Hui Committed by Josef Bacik
Browse files

Btrfs: fix btrfs_release_extent_buffer_page with the right usage of num_extent_pages 



num_extent_pages returns the number of pages in the specific range, not
the index of the last page in the eb range.

btrfs_release_extent_buffer_page is called with start_idx set 0 in current
codes, so it's not a problem yet. But the logic is indeed wrong.

Fix it here.

Signed-off-by: default avatarWang Sheng-Hui <shhuiw@gmail.com>
parent 1b303fc0

fs/btrfs/extent_io.c

+3 −1
Original line number Original line Diff line number Diff line
@@ -3981,11 +3981,13 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, 
						unsigned long start_idx)

						unsigned long start_idx)

{

{

	unsigned long index;

	unsigned long index;

	unsigned long num_pages;

	struct page *page;

	struct page *page;





	BUG_ON(extent_buffer_under_io(eb));

	BUG_ON(extent_buffer_under_io(eb));





	index = num_extent_pages(eb->start, eb->len);

	num_pages = num_extent_pages(eb->start, eb->len);

	index = start_idx + num_pages;

	if (start_idx >= index)

	if (start_idx >= index)

		return;

		return;