#ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT 6
+#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6)
#else
#define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */
#endif
-#define RADIX_TREE_TAGS 2
#define RADIX_TREE_MAP_SIZE (1UL << RADIX_TREE_MAP_SHIFT)
#define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE-1)
struct radix_tree_node {
unsigned int count;
void *slots[RADIX_TREE_MAP_SIZE];
- unsigned long tags[RADIX_TREE_TAGS][RADIX_TREE_TAG_LONGS];
+ unsigned long tags[RADIX_TREE_MAX_TAGS][RADIX_TREE_TAG_LONGS];
};
struct radix_tree_path {
};
DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, };
+static inline gfp_t root_gfp_mask(struct radix_tree_root *root)
+{
+ return root->gfp_mask & __GFP_BITS_MASK;
+}
+
/*
* This assumes that the caller has performed appropriate preallocation, and
* that the caller has pinned this thread of control to the current CPU.
radix_tree_node_alloc(struct radix_tree_root *root)
{
struct radix_tree_node *ret;
+ gfp_t gfp_mask = root_gfp_mask(root);
- ret = kmem_cache_alloc(radix_tree_node_cachep, root->gfp_mask);
- if (ret == NULL && !(root->gfp_mask & __GFP_WAIT)) {
+ ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
+ if (ret == NULL && !(gfp_mask & __GFP_WAIT)) {
struct radix_tree_preload *rtp;
rtp = &__get_cpu_var(radix_tree_preloads);
return ret;
}
-static inline void tag_set(struct radix_tree_node *node, int tag, int offset)
+static inline void tag_set(struct radix_tree_node *node, unsigned int tag,
+ int offset)
+{
+ __set_bit(offset, node->tags[tag]);
+}
+
+static inline void tag_clear(struct radix_tree_node *node, unsigned int tag,
+ int offset)
+{
+ __clear_bit(offset, node->tags[tag]);
+}
+
+static inline int tag_get(struct radix_tree_node *node, unsigned int tag,
+ int offset)
+{
+ return test_bit(offset, node->tags[tag]);
+}
+
+static inline void root_tag_set(struct radix_tree_root *root, unsigned int tag)
+{
+ root->gfp_mask |= (1 << (tag + __GFP_BITS_SHIFT));
+}
+
+
+static inline void root_tag_clear(struct radix_tree_root *root, unsigned int tag)
{
- if (!test_bit(offset, &node->tags[tag][0]))
- __set_bit(offset, &node->tags[tag][0]);
+ root->gfp_mask &= ~(1 << (tag + __GFP_BITS_SHIFT));
}
-static inline void tag_clear(struct radix_tree_node *node, int tag, int offset)
+static inline void root_tag_clear_all(struct radix_tree_root *root)
{
- __clear_bit(offset, &node->tags[tag][0]);
+ root->gfp_mask &= __GFP_BITS_MASK;
}
-static inline int tag_get(struct radix_tree_node *node, int tag, int offset)
+static inline int root_tag_get(struct radix_tree_root *root, unsigned int tag)
{
- return test_bit(offset, &node->tags[tag][0]);
+ return root->gfp_mask & (1 << (tag + __GFP_BITS_SHIFT));
+}
+
+/*
+ * Returns 1 if any slot in the node has this tag set.
+ * Otherwise returns 0.
+ */
+static inline int any_tag_set(struct radix_tree_node *node, unsigned int tag)
+{
+ int idx;
+ for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) {
+ if (node->tags[tag][idx])
+ return 1;
+ }
+ return 0;
}
/*
{
struct radix_tree_node *node;
unsigned int height;
- char tags[RADIX_TREE_TAGS];
int tag;
/* Figure out what the height should be. */
goto out;
}
- /*
- * Prepare the tag status of the top-level node for propagation
- * into the newly-pushed top-level node(s)
- */
- for (tag = 0; tag < RADIX_TREE_TAGS; tag++) {
- int idx;
-
- tags[tag] = 0;
- for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) {
- if (root->rnode->tags[tag][idx]) {
- tags[tag] = 1;
- break;
- }
- }
- }
-
do {
if (!(node = radix_tree_node_alloc(root)))
return -ENOMEM;
node->slots[0] = root->rnode;
/* Propagate the aggregated tag info into the new root */
- for (tag = 0; tag < RADIX_TREE_TAGS; tag++) {
- if (tags[tag])
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) {
+ if (root_tag_get(root, tag))
tag_set(node, tag, 0);
}
int error;
/* Make sure the tree is high enough. */
- if ((!index && !root->rnode) ||
- index > radix_tree_maxindex(root->height)) {
+ if (index > radix_tree_maxindex(root->height)) {
error = radix_tree_extend(root, index);
if (error)
return error;
node->slots[offset] = item;
BUG_ON(tag_get(node, 0, offset));
BUG_ON(tag_get(node, 1, offset));
- } else
+ } else {
root->rnode = item;
+ BUG_ON(root_tag_get(root, 0));
+ BUG_ON(root_tag_get(root, 1));
+ }
return 0;
}
struct radix_tree_node **slot;
height = root->height;
+
if (index > radix_tree_maxindex(height))
return NULL;
+ if (height == 0 && root->rnode)
+ return (void **)&root->rnode;
+
shift = (height-1) * RADIX_TREE_MAP_SHIFT;
slot = &root->rnode;
* @index: index key
* @tag: tag index
*
- * Set the search tag corresponging to @index in the radix tree. From
+ * Set the search tag (which must be < RADIX_TREE_MAX_TAGS)
+ * corresponding to @index in the radix tree. From
* the root all the way down to the leaf node.
*
* Returns the address of the tagged item. Setting a tag on a not-present
* item is a bug.
*/
void *radix_tree_tag_set(struct radix_tree_root *root,
- unsigned long index, int tag)
+ unsigned long index, unsigned int tag)
{
unsigned int height, shift;
struct radix_tree_node *slot;
height = root->height;
- if (index > radix_tree_maxindex(height))
- return NULL;
+ BUG_ON(index > radix_tree_maxindex(height));
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
slot = root->rnode;
+ shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
while (height > 0) {
int offset;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- tag_set(slot, tag, offset);
+ if (!tag_get(slot, tag, offset))
+ tag_set(slot, tag, offset);
slot = slot->slots[offset];
BUG_ON(slot == NULL);
shift -= RADIX_TREE_MAP_SHIFT;
height--;
}
+ /* set the root's tag bit */
+ if (slot && !root_tag_get(root, tag))
+ root_tag_set(root, tag);
+
return slot;
}
EXPORT_SYMBOL(radix_tree_tag_set);
* @index: index key
* @tag: tag index
*
- * Clear the search tag corresponging to @index in the radix tree. If
+ * Clear the search tag (which must be < RADIX_TREE_MAX_TAGS)
+ * corresponding to @index in the radix tree. If
* this causes the leaf node to have no tags set then clear the tag in the
* next-to-leaf node, etc.
*
* has the same return value and semantics as radix_tree_lookup().
*/
void *radix_tree_tag_clear(struct radix_tree_root *root,
- unsigned long index, int tag)
+ unsigned long index, unsigned int tag)
{
struct radix_tree_path path[RADIX_TREE_MAX_PATH], *pathp = path;
- struct radix_tree_node *slot;
+ struct radix_tree_node *slot = NULL;
unsigned int height, shift;
- void *ret = NULL;
height = root->height;
if (index > radix_tree_maxindex(height))
height--;
}
- ret = slot;
- if (ret == NULL)
+ if (slot == NULL)
goto out;
- do {
- int idx;
-
+ while (pathp->node) {
+ if (!tag_get(pathp->node, tag, pathp->offset))
+ goto out;
tag_clear(pathp->node, tag, pathp->offset);
- for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) {
- if (pathp->node->tags[tag][idx])
- goto out;
- }
+ if (any_tag_set(pathp->node, tag))
+ goto out;
pathp--;
- } while (pathp->node);
+ }
+
+ /* clear the root's tag bit */
+ if (root_tag_get(root, tag))
+ root_tag_clear(root, tag);
+
out:
- return ret;
+ return slot;
}
EXPORT_SYMBOL(radix_tree_tag_clear);
* radix_tree_tag_get - get a tag on a radix tree node
* @root: radix tree root
* @index: index key
- * @tag: tag index
+ * @tag: tag index (< RADIX_TREE_MAX_TAGS)
*
* Return values:
*
- * 0: tag not present
- * 1: tag present, set
- * -1: tag present, unset
+ * 0: tag not present or not set
+ * 1: tag set
*/
int radix_tree_tag_get(struct radix_tree_root *root,
- unsigned long index, int tag)
+ unsigned long index, unsigned int tag)
{
unsigned int height, shift;
struct radix_tree_node *slot;
if (index > radix_tree_maxindex(height))
return 0;
+ /* check the root's tag bit */
+ if (!root_tag_get(root, tag))
+ return 0;
+
+ if (height == 0)
+ return 1;
+
shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
slot = root->rnode;
int ret = tag_get(slot, tag, offset);
BUG_ON(ret && saw_unset_tag);
- return ret ? 1 : -1;
+ return !!ret;
}
slot = slot->slots[offset];
shift -= RADIX_TREE_MAP_SHIFT;
unsigned long i;
height = root->height;
- if (height == 0)
+ if (height == 0) {
+ if (root->rnode && index == 0)
+ results[nr_found++] = root->rnode;
goto out;
+ }
shift = (height-1) * RADIX_TREE_MAP_SHIFT;
slot = root->rnode;
*/
static unsigned int
__lookup_tag(struct radix_tree_root *root, void **results, unsigned long index,
- unsigned int max_items, unsigned long *next_index, int tag)
+ unsigned int max_items, unsigned long *next_index, unsigned int tag)
{
unsigned int nr_found = 0;
unsigned int shift;
unsigned int height = root->height;
struct radix_tree_node *slot;
+ if (height == 0) {
+ if (root->rnode && index == 0)
+ results[nr_found++] = root->rnode;
+ goto out;
+ }
+
shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
slot = root->rnode;
- while (height > 0) {
+ do {
unsigned long i = (index >> shift) & RADIX_TREE_MAP_MASK;
for ( ; i < RADIX_TREE_MAP_SIZE; i++) {
}
shift -= RADIX_TREE_MAP_SHIFT;
slot = slot->slots[i];
- }
+ } while (height > 0);
out:
*next_index = index;
return nr_found;
* @results: where the results of the lookup are placed
* @first_index: start the lookup from this key
* @max_items: place up to this many items at *results
- * @tag: the tag index
+ * @tag: the tag index (< RADIX_TREE_MAX_TAGS)
*
* Performs an index-ascending scan of the tree for present items which
* have the tag indexed by @tag set. Places the items at *@results and
*/
unsigned int
radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
- unsigned long first_index, unsigned int max_items, int tag)
+ unsigned long first_index, unsigned int max_items,
+ unsigned int tag)
{
const unsigned long max_index = radix_tree_maxindex(root->height);
unsigned long cur_index = first_index;
unsigned int ret = 0;
+ /* check the root's tag bit */
+ if (!root_tag_get(root, tag))
+ return 0;
+
while (ret < max_items) {
unsigned int nr_found;
unsigned long next_index; /* Index of next search */
}
EXPORT_SYMBOL(radix_tree_gang_lookup_tag);
+/**
+ * radix_tree_shrink - shrink height of a radix tree to minimal
+ * @root radix tree root
+ */
+static inline void radix_tree_shrink(struct radix_tree_root *root)
+{
+ /* try to shrink tree height */
+ while (root->height > 0 &&
+ root->rnode->count == 1 &&
+ root->rnode->slots[0]) {
+ struct radix_tree_node *to_free = root->rnode;
+
+ root->rnode = to_free->slots[0];
+ root->height--;
+ /* must only free zeroed nodes into the slab */
+ tag_clear(to_free, 0, 0);
+ tag_clear(to_free, 1, 0);
+ to_free->slots[0] = NULL;
+ to_free->count = 0;
+ radix_tree_node_free(to_free);
+ }
+}
+
/**
* radix_tree_delete - delete an item from a radix tree
* @root: radix tree root
void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
{
struct radix_tree_path path[RADIX_TREE_MAX_PATH], *pathp = path;
- struct radix_tree_path *orig_pathp;
- struct radix_tree_node *slot;
+ struct radix_tree_node *slot = NULL;
unsigned int height, shift;
- void *ret = NULL;
- char tags[RADIX_TREE_TAGS];
- int nr_cleared_tags;
+ int tag;
+ int offset;
height = root->height;
if (index > radix_tree_maxindex(height))
goto out;
- shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
- pathp->node = NULL;
slot = root->rnode;
+ if (height == 0 && root->rnode) {
+ root_tag_clear_all(root);
+ root->rnode = NULL;
+ goto out;
+ }
- for ( ; height > 0; height--) {
- int offset;
+ shift = (height - 1) * RADIX_TREE_MAP_SHIFT;
+ pathp->node = NULL;
+ do {
if (slot == NULL)
goto out;
+ pathp++;
offset = (index >> shift) & RADIX_TREE_MAP_MASK;
- pathp[1].offset = offset;
- pathp[1].node = slot;
+ pathp->offset = offset;
+ pathp->node = slot;
slot = slot->slots[offset];
- pathp++;
shift -= RADIX_TREE_MAP_SHIFT;
- }
+ height--;
+ } while (height > 0);
- ret = slot;
- if (ret == NULL)
+ if (slot == NULL)
goto out;
- orig_pathp = pathp;
-
/*
* Clear all tags associated with the just-deleted item
*/
- memset(tags, 0, sizeof(tags));
- do {
- int tag;
-
- nr_cleared_tags = RADIX_TREE_TAGS;
- for (tag = 0; tag < RADIX_TREE_TAGS; tag++) {
- int idx;
-
- if (tags[tag])
- continue;
-
- tag_clear(pathp->node, tag, pathp->offset);
-
- for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) {
- if (pathp->node->tags[tag][idx]) {
- tags[tag] = 1;
- nr_cleared_tags--;
- break;
- }
- }
- }
- pathp--;
- } while (pathp->node && nr_cleared_tags);
+ for (tag = 0; tag < RADIX_TREE_MAX_TAGS; tag++) {
+ if (tag_get(pathp->node, tag, pathp->offset))
+ radix_tree_tag_clear(root, index, tag);
+ }
/* Now free the nodes we do not need anymore */
- for (pathp = orig_pathp; pathp->node; pathp--) {
+ while (pathp->node) {
pathp->node->slots[pathp->offset] = NULL;
- if (--pathp->node->count)
+ pathp->node->count--;
+
+ if (pathp->node->count) {
+ if (pathp->node == root->rnode)
+ radix_tree_shrink(root);
goto out;
+ }
/* Node with zero slots in use so free it */
radix_tree_node_free(pathp->node);
+
+ pathp--;
}
- root->rnode = NULL;
+ root_tag_clear_all(root);
root->height = 0;
+ root->rnode = NULL;
+
out:
- return ret;
+ return slot;
}
EXPORT_SYMBOL(radix_tree_delete);
* @root: radix tree root
* @tag: tag to test
*/
-int radix_tree_tagged(struct radix_tree_root *root, int tag)
+int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag)
{
- int idx;
-
- if (!root->rnode)
- return 0;
- for (idx = 0; idx < RADIX_TREE_TAG_LONGS; idx++) {
- if (root->rnode->tags[tag][idx])
- return 1;
- }
- return 0;
+ return root_tag_get(root, tag);
}
EXPORT_SYMBOL(radix_tree_tagged);
projects / powerpc.git / blobdiff