3 # include <linux/slab.h>
7 # define kfree(x) do { if (x) free(x); } while (0)
8 # define BUG_ON(x) assert(!(x))
13 const char *crush_bucket_alg_name(int alg)
16 case CRUSH_BUCKET_UNIFORM: return "uniform";
17 case CRUSH_BUCKET_LIST: return "list";
18 case CRUSH_BUCKET_TREE: return "tree";
19 case CRUSH_BUCKET_STRAW: return "straw";
20 default: return "unknown";
25 * crush_get_bucket_item_weight - Get weight of an item in given bucket
27 * @p: item index in bucket
29 int crush_get_bucket_item_weight(struct crush_bucket *b, int p)
35 case CRUSH_BUCKET_UNIFORM:
36 return ((struct crush_bucket_uniform *)b)->item_weight;
37 case CRUSH_BUCKET_LIST:
38 return ((struct crush_bucket_list *)b)->item_weights[p];
39 case CRUSH_BUCKET_TREE:
41 return ((struct crush_bucket_tree *)b)->node_weights[p];
43 case CRUSH_BUCKET_STRAW:
44 return ((struct crush_bucket_straw *)b)->item_weights[p];
50 * crush_calc_parents - Calculate parent vectors for the given crush map.
51 * @map: crush_map pointer
53 void crush_calc_parents(struct crush_map *map)
57 for (b = 0; b < map->max_buckets; b++) {
58 if (map->buckets[b] == NULL)
60 for (i = 0; i < map->buckets[b]->size; i++) {
61 c = map->buckets[b]->items[i];
62 BUG_ON(c >= map->max_devices ||
63 c < -map->max_buckets);
65 map->device_parents[c] = map->buckets[b]->id;
67 map->bucket_parents[-1-c] = map->buckets[b]->id;
72 void crush_destroy_bucket_uniform(struct crush_bucket_uniform *b)
79 void crush_destroy_bucket_list(struct crush_bucket_list *b)
81 kfree(b->item_weights);
82 kfree(b->sum_weights);
88 void crush_destroy_bucket_tree(struct crush_bucket_tree *b)
90 kfree(b->node_weights);
94 void crush_destroy_bucket_straw(struct crush_bucket_straw *b)
97 kfree(b->item_weights);
103 void crush_destroy_bucket(struct crush_bucket *b)
106 case CRUSH_BUCKET_UNIFORM:
107 crush_destroy_bucket_uniform((struct crush_bucket_uniform *)b);
109 case CRUSH_BUCKET_LIST:
110 crush_destroy_bucket_list((struct crush_bucket_list *)b);
112 case CRUSH_BUCKET_TREE:
113 crush_destroy_bucket_tree((struct crush_bucket_tree *)b);
115 case CRUSH_BUCKET_STRAW:
116 crush_destroy_bucket_straw((struct crush_bucket_straw *)b);
122 * crush_destroy - Destroy a crush_map
123 * @map: crush_map pointer
125 void crush_destroy(struct crush_map *map)
131 for (b = 0; b < map->max_buckets; b++) {
132 if (map->buckets[b] == NULL)
134 crush_destroy_bucket(map->buckets[b]);
141 for (b = 0; b < map->max_rules; b++)
142 kfree(map->rules[b]);
146 kfree(map->bucket_parents);
147 kfree(map->device_parents);