bool increment_applied;
};
+DEFINE_MIN_HEAP(struct numbered_block_mapping, replay_heap);
+
struct repair_completion {
/* The completion header */
struct vdo_completion completion;
* order, then original journal order. This permits efficient iteration over the journal
* entries in order.
*/
- struct min_heap replay_heap;
+ struct replay_heap replay_heap;
/* Fields tracking progress through the journal entries. */
struct numbered_block_mapping *current_entry;
struct numbered_block_mapping *current_unfetched_entry;
}
static const struct min_heap_callbacks repair_min_heap = {
- .elem_size = sizeof(struct numbered_block_mapping),
.less = mapping_is_less_than,
.swp = swap_mappings,
};
static struct numbered_block_mapping *sort_next_heap_element(struct repair_completion *repair)
{
- struct min_heap *heap = &repair->replay_heap;
+ struct replay_heap *heap = &repair->replay_heap;
struct numbered_block_mapping *last;
if (heap->nr == 0)
* Organize the journal entries into a binary heap so we can iterate over them in sorted
* order incrementally, avoiding an expensive sort call.
*/
- repair->replay_heap = (struct min_heap) {
+ repair->replay_heap = (struct replay_heap) {
.data = repair->entries,
.nr = repair->block_map_entry_count,
.size = repair->block_map_entry_count,
#include <linux/types.h>
/**
- * struct min_heap - Data structure to hold a min-heap.
- * @data: Start of array holding the heap elements.
+ * Data structure to hold a min-heap.
* @nr: Number of elements currently in the heap.
* @size: Maximum number of elements that can be held in current storage.
+ * @data: Pointer to the start of array holding the heap elements.
+ * @preallocated: Start of the static preallocated array holding the heap elements.
*/
-struct min_heap {
- void *data;
- int nr;
- int size;
-};
+#define MIN_HEAP_PREALLOCATED(_type, _name, _nr) \
+struct _name { \
+ int nr; \
+ int size; \
+ _type *data; \
+ _type preallocated[_nr]; \
+}
+
+#define DEFINE_MIN_HEAP(_type, _name) MIN_HEAP_PREALLOCATED(_type, _name, 0)
+
+typedef DEFINE_MIN_HEAP(char, min_heap_char) min_heap_char;
+
+#define __minheap_cast(_heap) (typeof((_heap)->data[0]) *)
+#define __minheap_obj_size(_heap) sizeof((_heap)->data[0])
/**
* struct min_heap_callbacks - Data/functions to customise the min_heap.
- * @elem_size: The nr of each element in bytes.
* @less: Partial order function for this heap.
* @swp: Swap elements function.
*/
struct min_heap_callbacks {
- int elem_size;
bool (*less)(const void *lhs, const void *rhs);
void (*swp)(void *lhs, void *rhs);
};
/* Sift the element at pos down the heap. */
static __always_inline
-void min_heapify(struct min_heap *heap, int pos,
+void __min_heapify(min_heap_char *heap, int pos, size_t elem_size,
const struct min_heap_callbacks *func)
{
void *left, *right;
void *data = heap->data;
- void *root = data + pos * func->elem_size;
+ void *root = data + pos * elem_size;
int i = pos, j;
/* Find the sift-down path all the way to the leaves. */
for (;;) {
if (i * 2 + 2 >= heap->nr)
break;
- left = data + (i * 2 + 1) * func->elem_size;
- right = data + (i * 2 + 2) * func->elem_size;
+ left = data + (i * 2 + 1) * elem_size;
+ right = data + (i * 2 + 2) * elem_size;
i = func->less(left, right) ? i * 2 + 1 : i * 2 + 2;
}
i = i * 2 + 1;
/* Backtrack to the correct location. */
- while (i != pos && func->less(root, data + i * func->elem_size))
+ while (i != pos && func->less(root, data + i * elem_size))
i = (i - 1) / 2;
/* Shift the element into its correct place. */
j = i;
while (i != pos) {
i = (i - 1) / 2;
- func->swp(data + i * func->elem_size, data + j * func->elem_size);
+ func->swp(data + i * elem_size, data + j * elem_size);
}
}
+#define min_heapify(_heap, _pos, _func) \
+ __min_heapify((min_heap_char *)_heap, _pos, __minheap_obj_size(_heap), _func)
+
/* Floyd's approach to heapification that is O(nr). */
static __always_inline
-void min_heapify_all(struct min_heap *heap,
+void __min_heapify_all(min_heap_char *heap, size_t elem_size,
const struct min_heap_callbacks *func)
{
int i;
for (i = heap->nr / 2 - 1; i >= 0; i--)
- min_heapify(heap, i, func);
+ __min_heapify(heap, i, elem_size, func);
}
+#define min_heapify_all(_heap, _func) \
+ __min_heapify_all((min_heap_char *)_heap, __minheap_obj_size(_heap), _func)
+
/* Remove minimum element from the heap, O(log2(nr)). */
static __always_inline
-void min_heap_pop(struct min_heap *heap,
+void __min_heap_pop(min_heap_char *heap, size_t elem_size,
const struct min_heap_callbacks *func)
{
void *data = heap->data;
/* Place last element at the root (position 0) and then sift down. */
heap->nr--;
- memcpy(data, data + (heap->nr * func->elem_size), func->elem_size);
- min_heapify(heap, 0, func);
+ memcpy(data, data + (heap->nr * elem_size), elem_size);
+ __min_heapify(heap, 0, elem_size, func);
}
+#define min_heap_pop(_heap, _func) \
+ __min_heap_pop((min_heap_char *)_heap, __minheap_obj_size(_heap), _func)
+
/*
* Remove the minimum element and then push the given element. The
* implementation performs 1 sift (O(log2(nr))) and is therefore more
* efficient than a pop followed by a push that does 2.
*/
static __always_inline
-void min_heap_pop_push(struct min_heap *heap,
- const void *element,
+void __min_heap_pop_push(min_heap_char *heap,
+ const void *element, size_t elem_size,
const struct min_heap_callbacks *func)
{
- memcpy(heap->data, element, func->elem_size);
- min_heapify(heap, 0, func);
+ memcpy(heap->data, element, elem_size);
+ __min_heapify(heap, 0, elem_size, func);
}
+#define min_heap_pop_push(_heap, _element, _func) \
+ __min_heap_pop_push((min_heap_char *)_heap, _element, __minheap_obj_size(_heap), _func)
+
/* Push an element on to the heap, O(log2(nr)). */
static __always_inline
-void min_heap_push(struct min_heap *heap, const void *element,
+void __min_heap_push(min_heap_char *heap, const void *element, size_t elem_size,
const struct min_heap_callbacks *func)
{
void *data = heap->data;
/* Place at the end of data. */
pos = heap->nr;
- memcpy(data + (pos * func->elem_size), element, func->elem_size);
+ memcpy(data + (pos * elem_size), element, elem_size);
heap->nr++;
/* Sift child at pos up. */
for (; pos > 0; pos = (pos - 1) / 2) {
- child = data + (pos * func->elem_size);
- parent = data + ((pos - 1) / 2) * func->elem_size;
+ child = data + (pos * elem_size);
+ parent = data + ((pos - 1) / 2) * elem_size;
if (func->less(parent, child))
break;
func->swp(parent, child);
}
}
+#define min_heap_push(_heap, _element, _func) \
+ __min_heap_push((min_heap_char *)_heap, _element, __minheap_obj_size(_heap), _func)
+
#endif /* _LINUX_MIN_HEAP_H */
#include <linux/printk.h>
#include <linux/random.h>
+DEFINE_MIN_HEAP(int, min_heap_test);
+
static __init bool less_than(const void *lhs, const void *rhs)
{
return *(int *)lhs < *(int *)rhs;
}
static __init int pop_verify_heap(bool min_heap,
- struct min_heap *heap,
+ struct min_heap_test *heap,
const struct min_heap_callbacks *funcs)
{
int *values = heap->data;
{
int values[] = { 3, 1, 2, 4, 0x8000000, 0x7FFFFFF, 0,
-3, -1, -2, -4, 0x8000000, 0x7FFFFFF };
- struct min_heap heap = {
+ struct min_heap_test heap = {
.data = values,
.nr = ARRAY_SIZE(values),
.size = ARRAY_SIZE(values),
};
struct min_heap_callbacks funcs = {
- .elem_size = sizeof(int),
.less = min_heap ? less_than : greater_than,
.swp = swap_ints,
};
const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
-3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
int values[ARRAY_SIZE(data)];
- struct min_heap heap = {
+ struct min_heap_test heap = {
.data = values,
.nr = 0,
.size = ARRAY_SIZE(values),
};
struct min_heap_callbacks funcs = {
- .elem_size = sizeof(int),
.less = min_heap ? less_than : greater_than,
.swp = swap_ints,
};
const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
-3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
int values[ARRAY_SIZE(data)];
- struct min_heap heap = {
+ struct min_heap_test heap = {
.data = values,
.nr = 0,
.size = ARRAY_SIZE(values),
};
struct min_heap_callbacks funcs = {
- .elem_size = sizeof(int),
.less = min_heap ? less_than : greater_than,
.swp = swap_ints,
};
projects / thirdparty / linux.git / commitdiff
