From: Wang Sheng-Hui Date: Fri, 6 Apr 2012 06:35:31 +0000 (+0800) Subject: Btrfs: fix btrfs_release_extent_buffer_page with the right usage of num_extent_pages X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=39bab87ba6f4d8cce2b70c19e60233ad8030d7b4;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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: Wang Sheng-Hui --- diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index aeb98ceda51c..455daec2b6ce 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3981,11 +3981,13 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb, unsigned long start_idx) { unsigned long index; + unsigned long num_pages; struct page *page; 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) return;