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xarray: Define struct xa_node

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This is a direct replacement for struct radix_tree_node.  A couple of
struct members have changed name, so convert those.  Use a #define so
that radix tree users continue to work without change.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Matthew Wilcox
2017-11-09 09:23:56 -05:00
parent f8d5d0cc14
commit 01959dfe77
5 changed files with 77 additions and 73 deletions
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48
lib/radix-tree.c
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@@ -260,11 +260,11 @@ static void dump_node(struct radix_tree_node *node, unsigned long index)
{
unsigned long i;
pr_debug("radix node: %p offset %d indices %lu-%lu parent %p tags %lx %lx %lx shift %d count %d exceptional %d\n",
pr_debug("radix node: %p offset %d indices %lu-%lu parent %p tags %lx %lx %lx shift %d count %d nr_values %d\n",
node, node->offset, index, index | node_maxindex(node),
node->parent,
node->tags[0][0], node->tags[1][0], node->tags[2][0],
node->shift, node->count, node->exceptional);
node->shift, node->count, node->nr_values);
for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) {
unsigned long first = index | (i << node->shift);
@@ -354,7 +354,7 @@ 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)
unsigned int count, unsigned int nr_values)
{
struct radix_tree_node *ret = NULL;
@@ -401,9 +401,9 @@ out:
ret->shift = shift;
ret->offset = offset;
ret->count = count;
ret->exceptional = exceptional;
ret->nr_values = nr_values;
ret->parent = parent;
ret->root = root;
ret->array = root;
}
return ret;
}
@@ -633,8 +633,8 @@ static int radix_tree_extend(struct radix_tree_root *root, gfp_t gfp,
if (radix_tree_is_internal_node(entry)) {
entry_to_node(entry)->parent = node;
} else if (xa_is_value(entry)) {
/* Moving an exceptional root->xa_head to a node */
node->exceptional = 1;
/* Moving a value entry root->xa_head to a node */
node->nr_values = 1;
}
/*
* entry was already in the radix tree, so we do not need
@@ -928,12 +928,12 @@ static inline int insert_entries(struct radix_tree_node *node,
if (xa_is_node(old))
radix_tree_free_nodes(old);
if (xa_is_value(old))
node->exceptional--;
node->nr_values--;
}
if (node) {
node->count += n;
if (xa_is_value(item))
node->exceptional += n;
node->nr_values += n;
}
return n;
}
@@ -947,7 +947,7 @@ static inline int insert_entries(struct radix_tree_node *node,
if (node) {
node->count++;
if (xa_is_value(item))
node->exceptional++;
node->nr_values++;
}
return 1;
}
@@ -1083,7 +1083,7 @@ void *radix_tree_lookup(const struct radix_tree_root *root, unsigned long index)
EXPORT_SYMBOL(radix_tree_lookup);
static inline void replace_sibling_entries(struct radix_tree_node *node,
void __rcu **slot, int count, int exceptional)
void __rcu **slot, int count, int values)
{
#ifdef CONFIG_RADIX_TREE_MULTIORDER
unsigned offset = get_slot_offset(node, slot);
@@ -1096,18 +1096,18 @@ static inline void replace_sibling_entries(struct radix_tree_node *node,
node->slots[offset] = NULL;
node->count--;
}
node->exceptional += exceptional;
node->nr_values += values;
}
#endif
}
static void replace_slot(void __rcu **slot, void *item,
struct radix_tree_node *node, int count, int exceptional)
struct radix_tree_node *node, int count, int values)
{
if (node && (count || exceptional)) {
if (node && (count || values)) {
node->count += count;
node->exceptional += exceptional;
replace_sibling_entries(node, slot, count, exceptional);
node->nr_values += values;
replace_sibling_entries(node, slot, count, values);
}
rcu_assign_pointer(*slot, item);
@@ -1161,17 +1161,17 @@ void __radix_tree_replace(struct radix_tree_root *root,
radix_tree_update_node_t update_node)
{
void *old = rcu_dereference_raw(*slot);
int exceptional = !!xa_is_value(item) - !!xa_is_value(old);
int values = !!xa_is_value(item) - !!xa_is_value(old);
int count = calculate_count(root, node, slot, item, old);
/*
* This function supports replacing exceptional entries and
* This function supports replacing value entries and
* deleting entries, but that needs accounting against the
* node unless the slot is root->xa_head.
*/
WARN_ON_ONCE(!node && (slot != (void __rcu **)&root->xa_head) &&
(count || exceptional));
replace_slot(slot, item, node, count, exceptional);
(count || values));
replace_slot(slot, item, node, count, values);
if (!node)
return;
@@ -1193,7 +1193,7 @@ void __radix_tree_replace(struct radix_tree_root *root,
* across slot lookup and replacement.
*
* NOTE: This cannot be used to switch between non-entries (empty slots),
* regular entries, and exceptional entries, as that requires accounting
* regular entries, and value entries, as that requires accounting
* inside the radix tree node. When switching from one type of entry or
* deleting, use __radix_tree_lookup() and __radix_tree_replace() or
* radix_tree_iter_replace().
@@ -1301,7 +1301,7 @@ int radix_tree_split(struct radix_tree_root *root, unsigned long index,
rcu_assign_pointer(parent->slots[end], RADIX_TREE_RETRY);
}
rcu_assign_pointer(parent->slots[offset], RADIX_TREE_RETRY);
parent->exceptional -= (end - offset);
parent->nr_values -= (end - offset);
if (order == parent->shift)
return 0;
@@ -1961,7 +1961,7 @@ static bool __radix_tree_delete(struct radix_tree_root *root,
struct radix_tree_node *node, void __rcu **slot)
{
void *old = rcu_dereference_raw(*slot);
int exceptional = xa_is_value(old) ? -1 : 0;
int values = xa_is_value(old) ? -1 : 0;
unsigned offset = get_slot_offset(node, slot);
int tag;
@@ -1971,7 +1971,7 @@ static bool __radix_tree_delete(struct radix_tree_root *root,
for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++)
node_tag_clear(root, node, tag, offset);
replace_slot(slot, NULL, node, -1, exceptional);
replace_slot(slot, NULL, node, -1, values);
return node && delete_node(root, node, NULL);
}