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Subject[PATCH 14/19] radix-tree: Tidy up range_tag_if_tagged
Date
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@linux.intel.com>
---
lib/radix-tree.c | 39 +++++++++++++++++----------------------
1 file changed, 17 insertions(+), 22 deletions(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index fab4485..412dc35 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1009,9 +1009,9 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
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_tagged(struct radix_tree_root *root,
*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_tagged(struct radix_tree_root *root,
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;
--
2.8.0.rc3
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