From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wang Sheng-Hui Subject: [PATCH 3/4 RESEND] Btrfs: fix btrfs_release_extent_buffer_page with the right usage of num_extent_pages Date: Fri, 06 Apr 2012 14:35:31 +0800 Message-ID: <4F7E8EB3.4070609@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: Chris Mason , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: List-ID: 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 --- fs/btrfs/extent_io.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5505356..ddfc1d5 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3975,11 +3975,13 @@ 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; -- 1.7.1