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authorChris Mason <chris.mason@oracle.com>2008-08-20 08:51:50 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:06 -0400
commit7c2fe32a238eb12422beca5cbd5194a594baa559 (patch)
treea95bada9d991780e0611e94529e63c8178f4f3be /fs/btrfs/extent_map.c
parent902b22f341efa00be802418a0a8c57bddcd269a6 (diff)
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 <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_map.c')
-rw-r--r--fs/btrfs/extent_map.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 954b047639a..78ced11d18c 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) {