net/ceph/crush/crush.c

   1 #ifdef __KERNEL__
   2 # include <linux/slab.h>
   3 # include <linux/crush/crush.h>
   4 #else
   5 # include "crush_compat.h"
   6 # include "crush.h"
   7 #endif
   8
   9 const char *crush_bucket_alg_name(int alg)
  10 {
  11         switch (alg) {
  12         case CRUSH_BUCKET_UNIFORM: return "uniform";
  13         case CRUSH_BUCKET_LIST: return "list";
  14         case CRUSH_BUCKET_TREE: return "tree";
  15         case CRUSH_BUCKET_STRAW: return "straw";
  16         case CRUSH_BUCKET_STRAW2: return "straw2";
  17         default: return "unknown";
  18         }
  19 }
  20
  21 /**
  22  * crush_get_bucket_item_weight - Get weight of an item in given bucket
  23  * @b: bucket pointer
  24  * @p: item index in bucket
  25  */
  26 int crush_get_bucket_item_weight(const struct crush_bucket *b, int p)
  27 {
  28         if ((__u32)p >= b->size)
  29                 return 0;
  30
  31         switch (b->alg) {
  32         case CRUSH_BUCKET_UNIFORM:
  33                 return ((struct crush_bucket_uniform *)b)->item_weight;
  34         case CRUSH_BUCKET_LIST:
  35                 return ((struct crush_bucket_list *)b)->item_weights[p];
  36         case CRUSH_BUCKET_TREE:
  37                 return ((struct crush_bucket_tree *)b)->node_weights[crush_calc_tree_node(p)];
  38         case CRUSH_BUCKET_STRAW:
  39                 return ((struct crush_bucket_straw *)b)->item_weights[p];
  40         case CRUSH_BUCKET_STRAW2:
  41                 return ((struct crush_bucket_straw2 *)b)->item_weights[p];
  42         }
  43         return 0;
  44 }
  45
  46 void crush_destroy_bucket_uniform(struct crush_bucket_uniform *b)
  47 {
  48         kfree(b->h.items);
  49         kfree(b);
  50 }
  51
  52 void crush_destroy_bucket_list(struct crush_bucket_list *b)
  53 {
  54         kfree(b->item_weights);
  55         kfree(b->sum_weights);
  56         kfree(b->h.items);
  57         kfree(b);
  58 }
  59
  60 void crush_destroy_bucket_tree(struct crush_bucket_tree *b)
  61 {
  62         kfree(b->h.items);
  63         kfree(b->node_weights);
  64         kfree(b);
  65 }
  66
  67 void crush_destroy_bucket_straw(struct crush_bucket_straw *b)
  68 {
  69         kfree(b->straws);
  70         kfree(b->item_weights);
  71         kfree(b->h.items);
  72         kfree(b);
  73 }
  74
  75 void crush_destroy_bucket_straw2(struct crush_bucket_straw2 *b)
  76 {
  77         kfree(b->item_weights);
  78         kfree(b->h.items);
  79         kfree(b);
  80 }
  81
  82 void crush_destroy_bucket(struct crush_bucket *b)
  83 {
  84         switch (b->alg) {
  85         case CRUSH_BUCKET_UNIFORM:
  86                 crush_destroy_bucket_uniform((struct crush_bucket_uniform *)b);
  87                 break;
  88         case CRUSH_BUCKET_LIST:
  89                 crush_destroy_bucket_list((struct crush_bucket_list *)b);
  90                 break;
  91         case CRUSH_BUCKET_TREE:
  92                 crush_destroy_bucket_tree((struct crush_bucket_tree *)b);
  93                 break;
  94         case CRUSH_BUCKET_STRAW:
  95                 crush_destroy_bucket_straw((struct crush_bucket_straw *)b);
  96                 break;
  97         case CRUSH_BUCKET_STRAW2:
  98                 crush_destroy_bucket_straw2((struct crush_bucket_straw2 *)b);
  99                 break;
 100         }
 101 }
 102
 103 /**
 104  * crush_destroy - Destroy a crush_map
 105  * @map: crush_map pointer
 106  */
 107 void crush_destroy(struct crush_map *map)
 108 {
 109         /* buckets */
 110         if (map->buckets) {
 111                 __s32 b;
 112                 for (b = 0; b < map->max_buckets; b++) {
 113                         if (map->buckets[b] == NULL)
 114                                 continue;
 115                         crush_destroy_bucket(map->buckets[b]);
 116                 }
 117                 kfree(map->buckets);
 118         }
 119
 120         /* rules */
 121         if (map->rules) {
 122                 __u32 b;
 123                 for (b = 0; b < map->max_rules; b++)
 124                         crush_destroy_rule(map->rules[b]);
 125                 kfree(map->rules);
 126         }
 127
 128 #ifndef __KERNEL__
 129         kfree(map->choose_tries);
 130 #endif
 131         kfree(map);
 132 }
 133
 134 void crush_destroy_rule(struct crush_rule *rule)
 135 {
 136         kfree(rule);
 137 }