From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
radix_tree_replace_clear_tags() can be called with NULL as the replacement
value; in this case we need to delete sibling entries which point to
the slot.
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
lib/radix-tree.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index e49f32f7c537..89092c4011b8 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1799,17 +1799,23 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
}
EXPORT_SYMBOL(radix_tree_delete);
+/*
+ * If the caller passes NULL for @entry, it must take care to adjust
+ * node->count. See page_cache_tree_delete() for an example.
+ */
struct radix_tree_node *radix_tree_replace_clear_tags(
struct radix_tree_root *root,
unsigned long index, void *entry)
{
struct radix_tree_node *node;
void **slot;
+ unsigned int offset;
__radix_tree_lookup(root, index, &node, &slot);
if (node) {
- unsigned int tag, offset = get_slot_offset(node, slot);
+ unsigned int tag;
+ offset = get_slot_offset(node, slot);
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
node_tag_clear(root, node, tag, offset);
} else {
@@ -1818,6 +1824,9 @@ struct radix_tree_node *radix_tree_replace_clear_tags(
}
radix_tree_replace_slot(slot, entry);
+ if (!entry && node)
+ delete_sibling_entries(node, node_to_entry(slot), offset);
+
return node;
}
--
2.8.1
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