From 7c2fe32a238eb12422beca5cbd5194a594baa559 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Wed, 20 Aug 2008 08:51:50 -0400 Subject: Btrfs: Fix add_extent_mapping to check for duplicates across the whole range add_extent_mapping was allowing the insertion of overlapping extents. This never used to happen because it only inserted the extents from disk and those were never overlapping. But, with the data=ordered code, the disk and memory representations of the file are not the same. add_extent_mapping needs to ensure a new extent does not overlap before it inserts. Signed-off-by: Chris Mason --- fs/btrfs/extent_map.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs/btrfs/extent_map.c') diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 954b047639ab..78ced11d18c7 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -207,7 +207,14 @@ int add_extent_mapping(struct extent_map_tree *tree, int ret = 0; struct extent_map *merge = NULL; struct rb_node *rb; + struct extent_map *exist; + exist = lookup_extent_mapping(tree, em->start, em->len); + if (exist) { + free_extent_map(exist); + ret = -EEXIST; + goto out; + } assert_spin_locked(&tree->lock); rb = tree_insert(&tree->map, em->start, &em->rb_node); if (rb) { -- cgit v1.2.2