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-rw-r--r--lib/radix-tree.c69
1 files changed, 43 insertions, 26 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 7af368a4401b..0eee4020a7be 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -104,7 +104,7 @@ radix_tree_node_alloc(struct radix_tree_root *root)
rtp->nr--;
}
}
- BUG_ON(radix_tree_is_direct_ptr(ret));
+ BUG_ON(radix_tree_is_indirect_ptr(ret));
return ret;
}
@@ -240,7 +240,7 @@ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index)
return -ENOMEM;
/* Increase the height. */
- node->slots[0] = radix_tree_direct_to_ptr(root->rnode);
+ node->slots[0] = radix_tree_indirect_to_ptr(root->rnode);
/* Propagate the aggregated tag info into the new root */
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) {
@@ -251,6 +251,7 @@ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index)
newheight = root->height+1;
node->height = newheight;
node->count = 1;
+ node = radix_tree_ptr_to_indirect(node);
rcu_assign_pointer(root->rnode, node);
root->height = newheight;
} while (height > root->height);
@@ -274,7 +275,7 @@ int radix_tree_insert(struct radix_tree_root *root,
int offset;
int error;
- BUG_ON(radix_tree_is_direct_ptr(item));
+ BUG_ON(radix_tree_is_indirect_ptr(item));
/* Make sure the tree is high enough. */
if (index > radix_tree_maxindex(root->height)) {
@@ -283,7 +284,8 @@ int radix_tree_insert(struct radix_tree_root *root,
return error;
}
- slot = root->rnode;
+ slot = radix_tree_indirect_to_ptr(root->rnode);
+
height = root->height;
shift = (height-1) * RADIX_TREE_MAP_SHIFT;
@@ -298,7 +300,8 @@ int radix_tree_insert(struct radix_tree_root *root,
rcu_assign_pointer(node->slots[offset], slot);
node->count++;
} else
- rcu_assign_pointer(root->rnode, slot);
+ rcu_assign_pointer(root->rnode,
+ radix_tree_ptr_to_indirect(slot));
}
/* Go a level down */
@@ -318,7 +321,7 @@ int radix_tree_insert(struct radix_tree_root *root,
BUG_ON(tag_get(node, 0, offset));
BUG_ON(tag_get(node, 1, offset));
} else {
- rcu_assign_pointer(root->rnode, radix_tree_ptr_to_direct(item));
+ rcu_assign_pointer(root->rnode, item);
BUG_ON(root_tag_get(root, 0));
BUG_ON(root_tag_get(root, 1));
}
@@ -350,11 +353,12 @@ void **radix_tree_lookup_slot(struct radix_tree_root *root, unsigned long index)
if (node == NULL)
return NULL;
- if (radix_tree_is_direct_ptr(node)) {
+ if (!radix_tree_is_indirect_ptr(node)) {
if (index > 0)
return NULL;
return (void **)&root->rnode;
}
+ node = radix_tree_indirect_to_ptr(node);
height = node->height;
if (index > radix_tree_maxindex(height))
@@ -398,11 +402,12 @@ void *radix_tree_lookup(struct radix_tree_root *root, unsigned long index)
if (node == NULL)
return NULL;
- if (radix_tree_is_direct_ptr(node)) {
+ if (!radix_tree_is_indirect_ptr(node)) {
if (index > 0)
return NULL;
- return radix_tree_direct_to_ptr(node);
+ return node;
}
+ node = radix_tree_indirect_to_ptr(node);
height = node->height;
if (index > radix_tree_maxindex(height))
@@ -447,7 +452,7 @@ void *radix_tree_tag_set(struct radix_tree_root *root,
height = root->height;
BUG_ON(index > radix_tree_maxindex(height));
- slot = root->rnode;
+ slot = radix_tree_indirect_to_ptr(root->rnode);
shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
while (height > 0) {
@@ -497,7 +502,7 @@ void *radix_tree_tag_clear(struct radix_tree_root *root,
shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
pathp->node = NULL;
- slot = root->rnode;
+ slot = radix_tree_indirect_to_ptr(root->rnode);
while (height > 0) {
int offset;
@@ -562,8 +567,9 @@ int radix_tree_tag_get(struct radix_tree_root *root,
if (node == NULL)
return 0;
- if (radix_tree_is_direct_ptr(node))
+ if (!radix_tree_is_indirect_ptr(node))
return (index == 0);
+ node = radix_tree_indirect_to_ptr(node);
height = node->height;
if (index > radix_tree_maxindex(height))
@@ -716,13 +722,13 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
if (!node)
return 0;
- if (radix_tree_is_direct_ptr(node)) {
+ if (!radix_tree_is_indirect_ptr(node)) {
if (first_index > 0)
return 0;
- node = radix_tree_direct_to_ptr(node);
- results[0] = rcu_dereference(node);
+ results[0] = node;
return 1;
}
+ node = radix_tree_indirect_to_ptr(node);
max_index = radix_tree_maxindex(node->height);
@@ -844,13 +850,13 @@ radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
if (!node)
return 0;
- if (radix_tree_is_direct_ptr(node)) {
+ if (!radix_tree_is_indirect_ptr(node)) {
if (first_index > 0)
return 0;
- node = radix_tree_direct_to_ptr(node);
- results[0] = rcu_dereference(node);
+ results[0] = node;
return 1;
}
+ node = radix_tree_indirect_to_ptr(node);
max_index = radix_tree_maxindex(node->height);
@@ -880,12 +886,22 @@ EXPORT_SYMBOL(radix_tree_gang_lookup_tag);
static inline void radix_tree_shrink(struct radix_tree_root *root)
{
/* try to shrink tree height */
- while (root->height > 0 &&
- root->rnode->count == 1 &&
- root->rnode->slots[0]) {
+ while (root->height > 0) {
struct radix_tree_node *to_free = root->rnode;
void *newptr;
+ BUG_ON(!radix_tree_is_indirect_ptr(to_free));
+ to_free = radix_tree_indirect_to_ptr(to_free);
+
+ /*
+ * The candidate node has more than one child, or its child
+ * is not at the leftmost slot, we cannot shrink.
+ */
+ if (to_free->count != 1)
+ break;
+ if (!to_free->slots[0])
+ break;
+
/*
* We don't need rcu_assign_pointer(), since we are simply
* moving the node from one part of the tree to another. If
@@ -894,8 +910,8 @@ static inline void radix_tree_shrink(struct radix_tree_root *root)
* one (root->rnode).
*/
newptr = to_free->slots[0];
- if (root->height == 1)
- newptr = radix_tree_ptr_to_direct(newptr);
+ if (root->height > 1)
+ newptr = radix_tree_ptr_to_indirect(newptr);
root->rnode = newptr;
root->height--;
/* must only free zeroed nodes into the slab */
@@ -930,12 +946,12 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
goto out;
slot = root->rnode;
- if (height == 0 && root->rnode) {
- slot = radix_tree_direct_to_ptr(slot);
+ if (height == 0) {
root_tag_clear_all(root);
root->rnode = NULL;
goto out;
}
+ slot = radix_tree_indirect_to_ptr(slot);
shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
pathp->node = NULL;
@@ -977,7 +993,8 @@ void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
radix_tree_node_free(to_free);
if (pathp->node->count) {
- if (pathp->node == root->rnode)
+ if (pathp->node ==
+ radix_tree_indirect_to_ptr(root->rnode))
radix_tree_shrink(root);
goto out;
}

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