kernel/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.perm);
  49         kfree(b->h.items);
  50         kfree(b);
  51 }
  52
  53 void crush_destroy_bucket_list(struct crush_bucket_list *b)
  54 {
  55         kfree(b->item_weights);
  56         kfree(b->sum_weights);
  57         kfree(b->h.perm);
  58         kfree(b->h.items);
  59         kfree(b);
  60 }
  61
  62 void crush_destroy_bucket_tree(struct crush_bucket_tree *b)
  63 {
  64         kfree(b->h.perm);
  65         kfree(b->h.items);
  66         kfree(b->node_weights);
  67         kfree(b);
  68 }
  69
  70 void crush_destroy_bucket_straw(struct crush_bucket_straw *b)
  71 {
  72         kfree(b->straws);
  73         kfree(b->item_weights);
  74         kfree(b->h.perm);
  75         kfree(b->h.items);
  76         kfree(b);
  77 }
  78
  79 void crush_destroy_bucket_straw2(struct crush_bucket_straw2 *b)
  80 {
  81         kfree(b->item_weights);
  82         kfree(b->h.perm);
  83         kfree(b->h.items);
  84         kfree(b);
  85 }
  86
  87 void crush_destroy_bucket(struct crush_bucket *b)
  88 {
  89         switch (b->alg) {
  90         case CRUSH_BUCKET_UNIFORM:
  91                 crush_destroy_bucket_uniform((struct crush_bucket_uniform *)b);
  92                 break;
  93         case CRUSH_BUCKET_LIST:
  94                 crush_destroy_bucket_list((struct crush_bucket_list *)b);
  95                 break;
  96         case CRUSH_BUCKET_TREE:
  97                 crush_destroy_bucket_tree((struct crush_bucket_tree *)b);
  98                 break;
  99         case CRUSH_BUCKET_STRAW:
 100                 crush_destroy_bucket_straw((struct crush_bucket_straw *)b);
 101                 break;
 102         case CRUSH_BUCKET_STRAW2:
 103                 crush_destroy_bucket_straw2((struct crush_bucket_straw2 *)b);
 104                 break;
 105         }
 106 }
 107
 108 /**
 109  * crush_destroy - Destroy a crush_map
 110  * @map: crush_map pointer
 111  */
 112 void crush_destroy(struct crush_map *map)
 113 {
 114         /* buckets */
 115         if (map->buckets) {
 116                 __s32 b;
 117                 for (b = 0; b < map->max_buckets; b++) {
 118                         if (map->buckets[b] == NULL)
 119                                 continue;
 120                         crush_destroy_bucket(map->buckets[b]);
 121                 }
 122                 kfree(map->buckets);
 123         }
 124
 125         /* rules */
 126         if (map->rules) {
 127                 __u32 b;
 128                 for (b = 0; b < map->max_rules; b++)
 129                         crush_destroy_rule(map->rules[b]);
 130                 kfree(map->rules);
 131         }
 132
 133 #ifndef __KERNEL__
 134         kfree(map->choose_tries);
 135 #endif
 136         kfree(map);
 137 }
 138
 139 void crush_destroy_rule(struct crush_rule *rule)
 140 {
 141         kfree(rule);
 142 }