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authorMatthew Wilcox <willy@linux.intel.com>2016-05-20 17:03:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 17:58:30 -0700
commita8e4da25d3c573a0c3cf2fb33e91ec5cad8d7f16 (patch)
tree71b242a4d20cd9e56158d5f48b58fafb22fc3c4a /lib
parent8c1244de00ef98f73e21eecc42d84b2742fbb4f9 (diff)
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@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/radix-tree.c39
1 files changed, 17 insertions, 22 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index c42867a1769a..1a82066165db 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;