mirror of
https://github.com/ceph/ceph
synced 2025-02-09 03:49:38 +00:00
124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
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#ifndef _CRUSH_CRUSH_H
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#define _CRUSH_CRUSH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef __CYGWIN__
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# include <asm/types.h>
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# include <inttypes.h>
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typedef uint64_t __u64;
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#else
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# include <linux/types.h> /* just for int types */
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#endif
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#ifndef BUG_ON
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# include <assert.h>
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# define BUG_ON(x) assert(!(x))
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#endif
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/*** RULES ***/
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enum {
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CRUSH_RULE_TAKE,
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CRUSH_RULE_CHOOSE_FIRSTN,
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CRUSH_RULE_CHOOSE_INDEP,
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CRUSH_RULE_EMIT
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};
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#define CRUSH_MAX_DEPTH 10
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#define CRUSH_MAX_SET 10
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struct crush_rule_step {
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__u32 op;
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__s32 arg1;
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__s32 arg2;
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};
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struct crush_rule {
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__u32 len;
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struct crush_rule_step *steps;
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};
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/*** BUCKETS ***/
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enum {
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CRUSH_BUCKET_UNIFORM = 1,
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CRUSH_BUCKET_LIST = 2,
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CRUSH_BUCKET_TREE = 3,
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CRUSH_BUCKET_STRAW = 4
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};
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struct crush_bucket {
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__s32 id; /* this'll be negative */
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__u16 type;
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__u16 bucket_type;
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__u32 weight; /* 16-bit fixed point */
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__u32 size; /* num items */
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__s32 *items;
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};
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struct crush_bucket_uniform {
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struct crush_bucket h;
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__u32 *primes;
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__u32 item_weight; /* 16-bit fixed point */
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};
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struct crush_bucket_list {
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struct crush_bucket h;
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__u32 *item_weights; /* 16-bit fixed point */
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__u32 *sum_weights; /* 16-bit fixed point. element i is sum of weights 0..i, inclusive */
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};
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struct crush_bucket_tree {
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struct crush_bucket h; /* note: h.size is tree size, not number of actual items */
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__u32 *node_weights;
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};
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struct crush_bucket_straw {
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struct crush_bucket h;
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__u32 *straws; /* 16-bit fixed point */
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};
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/*** CRUSH ***/
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struct crush_map {
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struct crush_bucket **buckets;
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struct crush_rule **rules;
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/* parent pointers */
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__u32 *bucket_parents;
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__u32 *device_parents;
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/* offload
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* size max_devices, values 0...0xffff
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* 0 == normal
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* 0x10000 == 100% offload (i.e. failed)
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*/
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__u32 *device_offload;
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__u32 max_buckets;
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__u32 max_rules;
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__s32 max_devices;
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};
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/* common destructors */
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extern void crush_destroy_bucket_uniform(struct crush_bucket_uniform *);
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extern void crush_destroy_bucket_list(struct crush_bucket_list *);
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extern void crush_destroy_bucket_tree(struct crush_bucket_tree *);
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extern void crush_destroy_bucket_straw(struct crush_bucket_straw *);
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extern void crush_destroy(struct crush_map *map);
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#ifdef __cplusplus
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}
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#endif
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#endif
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