Quelle  crush.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#ifdef __KERNEL__
# include <linux/slab.h>
# include <linux/crush/crush.h>
#else
# include "crush_compat.h"
# include "crush.h"
#endif

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";
 case CRUSH_BUCKET_STRAW2: return "straw2";
 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(const struct crush_bucket *b, int p)
{
 if ((__u32)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:
  return ((struct crush_bucket_tree *)b)->node_weights[crush_calc_tree_node(p)];
 case CRUSH_BUCKET_STRAW:
  return ((struct crush_bucket_straw *)b)->item_weights[p];
 case CRUSH_BUCKET_STRAW2:
  return ((struct crush_bucket_straw2 *)b)->item_weights[p];
 }
 return 0;
}

void crush_destroy_bucket_uniform(struct crush_bucket_uniform *b)
{
 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.items);
 kfree(b);
}

void crush_destroy_bucket_tree(struct crush_bucket_tree *b)
{
 kfree(b->h.items);
 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.items);
 kfree(b);
}

void crush_destroy_bucket_straw2(struct crush_bucket_straw2 *b)
{
 kfree(b->item_weights);
 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;
 case CRUSH_BUCKET_STRAW2:
  crush_destroy_bucket_straw2((struct crush_bucket_straw2 *)b);
  break;
 }
}

/**
 * crush_destroy - Destroy a crush_map
 * @map: crush_map pointer
 */
void crush_destroy(struct crush_map *map)
{
 /* buckets */
 if (map->buckets) {
  __s32 b;
  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) {
  __u32 b;
  for (b = 0; b < map->max_rules; b++)
   crush_destroy_rule(map->rules[b]);
  kfree(map->rules);
 }

#ifndef __KERNEL__
 kfree(map->choose_tries);
#else
 clear_crush_names(&map->type_names);
 clear_crush_names(&map->names);
 clear_choose_args(map);
#endif
 kfree(map);
}

void crush_destroy_rule(struct crush_rule *rule)
{
 kfree(rule);
}