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