From: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Subject: radix-tree: tidy up range_tag_if_tagged
Convert radix_tree_range_tag_if_tagged to name the nodes parent, node and
child instead of node & slot.
Use parent->offset instead of playing games with 'upindex'.
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>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/radix-tree.c | 39 +++++++++++++++++----------------------
1 file changed, 17 insertions(+), 22 deletions(-)
diff -puN lib/radix-tree.c~radix-tree-tidy-up-range_tag_if_tagged lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-tidy-up-range_tag_if_tagged
+++ a/lib/radix-tree.c
@@ -1009,9 +1009,9 @@ unsigned long radix_tree_range_tag_if_ta
unsigned long nr_to_tag,
unsigned int iftag, unsigned int settag)
{
- struct radix_tree_node *slot, *node = NULL;
+ struct radix_tree_node *parent, *node, *child;
unsigned long maxindex;
- unsigned int shift = radix_tree_load_root(root, &slot, &maxindex);
+ unsigned int shift = radix_tree_load_root(root, &child, &maxindex);
unsigned long tagged = 0;
unsigned long index = *first_indexp;
@@ -1024,28 +1024,25 @@ unsigned long radix_tree_range_tag_if_ta
*first_indexp = last_index + 1;
return 0;
}
- if (!radix_tree_is_internal_node(slot)) {
+ if (!radix_tree_is_internal_node(child)) {
*first_indexp = last_index + 1;
root_tag_set(root, settag);
return 1;
}
- node = entry_to_node(slot);
+ node = entry_to_node(child);
shift -= RADIX_TREE_MAP_SHIFT;
for (;;) {
- unsigned long upindex;
- unsigned offset;
-
- offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- offset = radix_tree_descend(node, &slot, offset);
- if (!slot)
+ unsigned offset = (index >> shift) & RADIX_TREE_MAP_MASK;
+ offset = radix_tree_descend(node, &child, offset);
+ if (!child)
goto next;
if (!tag_get(node, iftag, offset))
goto next;
/* Sibling slots never have tags set on them */
- if (radix_tree_is_internal_node(slot)) {
- node = entry_to_node(slot);
+ if (radix_tree_is_internal_node(child)) {
+ node = entry_to_node(child);
shift -= RADIX_TREE_MAP_SHIFT;
continue;
}
@@ -1054,20 +1051,18 @@ unsigned long radix_tree_range_tag_if_ta
tagged++;
tag_set(node, settag, offset);
- slot = node->parent;
/* walk back up the path tagging interior nodes */
- upindex = index >> shift;
- while (slot) {
- upindex >>= RADIX_TREE_MAP_SHIFT;
- offset = upindex & RADIX_TREE_MAP_MASK;
-
+ parent = node;
+ for (;;) {
+ offset = parent->offset;
+ parent = parent->parent;
+ if (!parent)
+ break;
/* stop if we find a node with the tag already set */
- if (tag_get(slot, settag, offset))
+ if (tag_get(parent, settag, offset))
break;
- tag_set(slot, settag, offset);
- slot = slot->parent;
+ tag_set(parent, settag, offset);
}
-
next:
/* Go to next item at level determined by 'shift' */
index = ((index >> shift) + 1) << shift;
_
--
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