btrfs-progs/crypto/hash.c

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#include "crypto/hash.h"
#include "crypto/xxhash.h"
int hash_xxhash(const u8 *buf, size_t length, u8 *out)
{
XXH64_hash_t hash;
hash = XXH64(buf, length, 0);
/*
* NOTE: we're not taking the canonical form here but the plain hash to
* be compatible with the kernel implementation!
*/
memcpy(out, &hash, 8);
return 0;
}