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kernel add
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#ifndef CEPH_CRUSH_HASH_H
#define CEPH_CRUSH_HASH_H
#ifdef __KERNEL__
# include <linux/types.h>
#else
# include "crush_compat.h"
#endif
#define CRUSH_HASH_RJENKINS1 0
#define CRUSH_HASH_DEFAULT CRUSH_HASH_RJENKINS1
extern const char *crush_hash_name(int type);
extern __u32 crush_hash32(int type, __u32 a);
extern __u32 crush_hash32_2(int type, __u32 a, __u32 b);
extern __u32 crush_hash32_3(int type, __u32 a, __u32 b, __u32 c);
extern __u32 crush_hash32_4(int type, __u32 a, __u32 b, __u32 c, __u32 d);
extern __u32 crush_hash32_5(int type, __u32 a, __u32 b, __u32 c, __u32 d,
__u32 e);
#endif
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