mirror of https://gitee.com/openkylin/linux.git
152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
|
|
#ifdef __KERNEL__
|
|
# include <linux/slab.h>
|
|
#else
|
|
# include <stdlib.h>
|
|
# include <assert.h>
|
|
# define kfree(x) do { if (x) free(x); } while (0)
|
|
# define BUG_ON(x) assert(!(x))
|
|
#endif
|
|
|
|
#include <linux/crush/crush.h>
|
|
|
|
const char *crush_bucket_alg_name(int alg)
|
|
{
|
|
switch (alg) {
|
|
case CRUSH_BUCKET_UNIFORM: return "uniform";
|
|
case CRUSH_BUCKET_LIST: return "list";
|
|
case CRUSH_BUCKET_TREE: return "tree";
|
|
case CRUSH_BUCKET_STRAW: return "straw";
|
|
default: return "unknown";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* crush_get_bucket_item_weight - Get weight of an item in given bucket
|
|
* @b: bucket pointer
|
|
* @p: item index in bucket
|
|
*/
|
|
int crush_get_bucket_item_weight(struct crush_bucket *b, int p)
|
|
{
|
|
if (p >= b->size)
|
|
return 0;
|
|
|
|
switch (b->alg) {
|
|
case CRUSH_BUCKET_UNIFORM:
|
|
return ((struct crush_bucket_uniform *)b)->item_weight;
|
|
case CRUSH_BUCKET_LIST:
|
|
return ((struct crush_bucket_list *)b)->item_weights[p];
|
|
case CRUSH_BUCKET_TREE:
|
|
if (p & 1)
|
|
return ((struct crush_bucket_tree *)b)->node_weights[p];
|
|
return 0;
|
|
case CRUSH_BUCKET_STRAW:
|
|
return ((struct crush_bucket_straw *)b)->item_weights[p];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* crush_calc_parents - Calculate parent vectors for the given crush map.
|
|
* @map: crush_map pointer
|
|
*/
|
|
void crush_calc_parents(struct crush_map *map)
|
|
{
|
|
int i, b, c;
|
|
|
|
for (b = 0; b < map->max_buckets; b++) {
|
|
if (map->buckets[b] == NULL)
|
|
continue;
|
|
for (i = 0; i < map->buckets[b]->size; i++) {
|
|
c = map->buckets[b]->items[i];
|
|
BUG_ON(c >= map->max_devices ||
|
|
c < -map->max_buckets);
|
|
if (c >= 0)
|
|
map->device_parents[c] = map->buckets[b]->id;
|
|
else
|
|
map->bucket_parents[-1-c] = map->buckets[b]->id;
|
|
}
|
|
}
|
|
}
|
|
|
|
void crush_destroy_bucket_uniform(struct crush_bucket_uniform *b)
|
|
{
|
|
kfree(b->h.perm);
|
|
kfree(b->h.items);
|
|
kfree(b);
|
|
}
|
|
|
|
void crush_destroy_bucket_list(struct crush_bucket_list *b)
|
|
{
|
|
kfree(b->item_weights);
|
|
kfree(b->sum_weights);
|
|
kfree(b->h.perm);
|
|
kfree(b->h.items);
|
|
kfree(b);
|
|
}
|
|
|
|
void crush_destroy_bucket_tree(struct crush_bucket_tree *b)
|
|
{
|
|
kfree(b->node_weights);
|
|
kfree(b);
|
|
}
|
|
|
|
void crush_destroy_bucket_straw(struct crush_bucket_straw *b)
|
|
{
|
|
kfree(b->straws);
|
|
kfree(b->item_weights);
|
|
kfree(b->h.perm);
|
|
kfree(b->h.items);
|
|
kfree(b);
|
|
}
|
|
|
|
void crush_destroy_bucket(struct crush_bucket *b)
|
|
{
|
|
switch (b->alg) {
|
|
case CRUSH_BUCKET_UNIFORM:
|
|
crush_destroy_bucket_uniform((struct crush_bucket_uniform *)b);
|
|
break;
|
|
case CRUSH_BUCKET_LIST:
|
|
crush_destroy_bucket_list((struct crush_bucket_list *)b);
|
|
break;
|
|
case CRUSH_BUCKET_TREE:
|
|
crush_destroy_bucket_tree((struct crush_bucket_tree *)b);
|
|
break;
|
|
case CRUSH_BUCKET_STRAW:
|
|
crush_destroy_bucket_straw((struct crush_bucket_straw *)b);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* crush_destroy - Destroy a crush_map
|
|
* @map: crush_map pointer
|
|
*/
|
|
void crush_destroy(struct crush_map *map)
|
|
{
|
|
int b;
|
|
|
|
/* buckets */
|
|
if (map->buckets) {
|
|
for (b = 0; b < map->max_buckets; b++) {
|
|
if (map->buckets[b] == NULL)
|
|
continue;
|
|
crush_destroy_bucket(map->buckets[b]);
|
|
}
|
|
kfree(map->buckets);
|
|
}
|
|
|
|
/* rules */
|
|
if (map->rules) {
|
|
for (b = 0; b < map->max_rules; b++)
|
|
kfree(map->rules[b]);
|
|
kfree(map->rules);
|
|
}
|
|
|
|
kfree(map->bucket_parents);
|
|
kfree(map->device_parents);
|
|
kfree(map);
|
|
}
|
|
|
|
|