From 3dd39914bc0737d055c780d29c20a1d117819cdb Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 11 Apr 2008 10:51:07 -0400 Subject: [PATCH] Btrfs: Add extra checks to avoid removing extent_state from pages we can't free Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index cf1de75f088a..e22960e23501 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -436,6 +436,12 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags) struct extent_map_tree *map; int ret; + if (page_count(page) > 3) { + /* once for page->private, once for the caller, once + * once for the page cache + */ + return 0; + } tree = &BTRFS_I(page->mapping->host)->io_tree; map = &BTRFS_I(page->mapping->host)->extent_tree; ret = try_release_extent_mapping(map, tree, page, gfp_flags); -- 2.20.1