From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: radix-tree: rewrite radix_tree_tag_clear
Use the new multi-order support functions to rewrite
radix_tree_tag_clear()
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/radix-tree.c | 44 ++++++++++++++++++++------------------------
1 file changed, 20 insertions(+), 24 deletions(-)
diff -puN lib/radix-tree.c~radix-tree-rewrite-radix_tree_tag_clear lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-rewrite-radix_tree_tag_clear
+++ a/lib/radix-tree.c
@@ -768,44 +768,40 @@ EXPORT_SYMBOL(radix_tree_tag_set);
void *radix_tree_tag_clear(struct radix_tree_root *root,
unsigned long index, unsigned int tag)
{
- struct radix_tree_node *node = NULL;
- struct radix_tree_node *slot = NULL;
- unsigned int height, shift;
+ struct radix_tree_node *node, *parent;
+ unsigned long maxindex;
+ unsigned int shift;
int uninitialized_var(offset);
- height = root->height;
- if (index > radix_tree_maxindex(height))
- goto out;
-
- shift = height * RADIX_TREE_MAP_SHIFT;
- slot = root->rnode;
+ shift = radix_tree_load_root(root, &node, &maxindex);
+ if (index > maxindex)
+ return NULL;
- while (shift) {
- if (slot == NULL)
- goto out;
- if (!radix_tree_is_indirect_ptr(slot))
- break;
- slot = indirect_to_ptr(slot);
+ parent = NULL;
+ while (radix_tree_is_indirect_ptr(node)) {
shift -= RADIX_TREE_MAP_SHIFT;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- node = slot;
- slot = slot->slots[offset];
+
+ parent = indirect_to_ptr(node);
+ offset = radix_tree_descend(parent, &node, offset);
}
- if (slot == NULL)
+ if (node == NULL)
goto out;
- while (node) {
- if (!tag_get(node, tag, offset))
+ index >>= shift;
+
+ while (parent) {
+ if (!tag_get(parent, tag, offset))
goto out;
- tag_clear(node, tag, offset);
- if (any_tag_set(node, tag))
+ tag_clear(parent, tag, offset);
+ if (any_tag_set(parent, tag))
goto out;
index >>= RADIX_TREE_MAP_SHIFT;
offset = index & RADIX_TREE_MAP_MASK;
- node = node->parent;
+ parent = parent->parent;
}
/* clear the root's tag bit */
@@ -813,7 +809,7 @@ void *radix_tree_tag_clear(struct radix_
root_tag_clear(root, tag);
out:
- return slot;
+ return node;
}
EXPORT_SYMBOL(radix_tree_tag_clear);
_
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