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Btrfs: Fix add_extent_mapping to check for duplicates across the whole range

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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>
This commit is contained in:
Chris Mason
2008-08-20 08:51:50 -04:00
parent 902b22f341
commit 7c2fe32a23
2 changed files with 24 additions and 4 deletions
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fs/btrfs/extent_map.c
+7
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@@ -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) {