crush.c
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#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);
}