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radix-tree: Store a pointer to the root in each node

소스 검색 
Instead of having this mysterious private_data in each radix_tree_node,
store a pointer to the root, which can be useful for debugging.  This also
relieves the mm code from the duty of updating it.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Matthew Wilcox
2017-01-16 17:10:21 -05:00
부모 1293d5c5f5
커밋 d58275bc96
3개의 변경된 파일과 11개의 추가작업 그리고 11개의 파일을 삭제
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14
lib/radix-tree.c
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@@ -374,6 +374,7 @@ static void ida_dump(struct ida *ida)
*/
static struct radix_tree_node *
radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent,
struct radix_tree_root *root,
unsigned int shift, unsigned int offset,
unsigned int count, unsigned int exceptional)
{
@@ -419,11 +420,12 @@ radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent,
out:
BUG_ON(radix_tree_is_internal_node(ret));
if (ret) {
ret->parent = parent;
ret->shift = shift;
ret->offset = offset;
ret->count = count;
ret->exceptional = exceptional;
ret->parent = parent;
ret->root = root;
}
return ret;
}
@@ -631,7 +633,7 @@ static int radix_tree_extend(struct radix_tree_root *root, gfp_t gfp,
do {
struct radix_tree_node *node = radix_tree_node_alloc(gfp, NULL,
shift, 0, 1, 0);
root, shift, 0, 1, 0);
if (!node)
return -ENOMEM;
@@ -828,7 +830,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
shift -= RADIX_TREE_MAP_SHIFT;
if (child == NULL) {
/* Have to add a child node. */
child = radix_tree_node_alloc(gfp, node, shift,
child = radix_tree_node_alloc(gfp, node, root, shift,
offset, 0, 0);
if (!child)
return -ENOMEM;
@@ -1330,7 +1332,7 @@ int radix_tree_split(struct radix_tree_root *root, unsigned long index,
for (;;) {
if (node->shift > order) {
child = radix_tree_node_alloc(gfp, node,
child = radix_tree_node_alloc(gfp, node, root,
node->shift - RADIX_TREE_MAP_SHIFT,
offset, 0, 0);
if (!child)
@@ -2152,8 +2154,8 @@ void **idr_get_free(struct radix_tree_root *root,
shift -= RADIX_TREE_MAP_SHIFT;
if (child == NULL) {
/* Have to add a child node. */
child = radix_tree_node_alloc(gfp, node, shift, offset,
0, 0);
child = radix_tree_node_alloc(gfp, node, root, shift,
offset, 0, 0);
if (!child)
return ERR_PTR(-ENOMEM);
all_tag_set(child, IDR_FREE);