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radix-tree: rewrite radix_tree_tag_clear

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Use the new multi-order support functions to rewrite
radix_tree_tag_clear()

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ross Zwisler 2016-05-20 17:02:35 -07:00 committed by Linus Torvalds
parent fb969909dd
commit 00f47b5811
1 changed files with 20 additions and 24 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

44
lib/radix-tree.c
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@ -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 = radix_tree_load_root(root, &node, &maxindex);
if (index > maxindex)
return NULL;
shift = height * RADIX_TREE_MAP_SHIFT;
slot = root->rnode;
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_tree_root *root,
root_tag_clear(root, tag);
out:
return slot;
return node;
}
EXPORT_SYMBOL(radix_tree_tag_clear);