-#ifdef __KERNEL__
-/* This hash calculate method must be same as the lvar hash method */
-
-#define LVAR_HASH_SANDWICH (0)
-#define LVAR_HASH_TEA (1)
-#define LVAR_HASH_R5 (0)
-#define LVAR_HASH_PREFIX (0)
-
-static __u32 hash_build0(const char *name, int namelen)
-{
- __u32 result;
-
- if (namelen == 0)
- return 0;
- if (strncmp(name, ".", 1) == 0 && namelen == 1)
- return 1;
- if (strncmp(name, "..", 2) == 0 && namelen == 2)
- return 2;
-
- if (LVAR_HASH_PREFIX) {
- result = 0;
- strncpy((void *)&result,
- name, min(namelen, (int)sizeof result));
- } else {
- struct ldiskfs_dx_hash_info hinfo;
-
- if (LVAR_HASH_TEA)
- hinfo.hash_version = LDISKFS_DX_HASH_TEA;
- else
- hinfo.hash_version = LDISKFS_DX_HASH_R5;
- hinfo.seed = 0;
- ldiskfsfs_dirhash(name, namelen, &hinfo);
- result = hinfo.hash;
- if (LVAR_HASH_SANDWICH) {
- __u32 result2;
-
- hinfo.hash_version = LDISKFS_DX_HASH_TEA;
- hinfo.seed = 0;
- ldiskfsfs_dirhash(name, namelen, &hinfo);
- result2 = hinfo.hash;
- result = (0xfc000000 & result2) | (0x03ffffff & result);
- }
- }
-
- return result;
-}
-
-enum {
- HASH_GRAY_AREA = 1024
-};
-
-static __u32 hash_build(const char *name, int namelen)
-{
- __u32 hash;
-
- hash = (hash_build0(name, namelen) << 1) & MAX_HASH_SIZE;
- if (hash > MAX_HASH_SIZE - HASH_GRAY_AREA)
- hash &= HASH_GRAY_AREA - 1;
- return hash;
-}
-
-static int mea_hash_segment(int count, const char *name, int namelen)
-{
- __u32 hash;
-
- LASSERT(IS_PO2(MAX_HASH_SIZE + 1));
-
- hash = hash_build(name, namelen) / (MAX_HASH_SIZE / count);
- LASSERTF(hash < count, "hash %x count %d \n", hash, count);
-
- return hash;
-}
-#else
-static int mea_hash_segment(int count, char *name, int namelen)
-{
-#warning "fix for liblustre"
- return 0;
-}
-#endif