| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License version 2 for more details. A copy is |
| * included in the COPYING file that accompanied this code. |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2013, Intel Corporation. |
| */ |
| /* |
| * lustre/include/lustre_lmv.h |
| * |
| * Lustre LMV structures and functions. |
| * |
| * Author: Di Wang <di.wang@intel.com> |
| */ |
| |
| #ifndef _LUSTRE_LMV_H |
| #define _LUSTRE_LMV_H |
| #include <uapi/linux/lustre/lustre_idl.h> |
| |
| struct lmv_oinfo { |
| struct lu_fid lmo_fid; |
| u32 lmo_mds; |
| struct inode *lmo_root; |
| }; |
| |
| struct lmv_stripe_md { |
| __u32 lsm_md_magic; |
| __u32 lsm_md_stripe_count; |
| __u32 lsm_md_master_mdt_index; |
| __u32 lsm_md_hash_type; |
| __u32 lsm_md_layout_version; |
| __u32 lsm_md_default_count; |
| __u32 lsm_md_default_index; |
| char lsm_md_pool_name[LOV_MAXPOOLNAME + 1]; |
| struct lmv_oinfo lsm_md_oinfo[0]; |
| }; |
| |
| static inline bool |
| lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2) |
| { |
| __u32 idx; |
| |
| if (lsm1->lsm_md_magic != lsm2->lsm_md_magic || |
| lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count || |
| lsm1->lsm_md_master_mdt_index != lsm2->lsm_md_master_mdt_index || |
| lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type || |
| lsm1->lsm_md_layout_version != lsm2->lsm_md_layout_version || |
| !strcmp(lsm1->lsm_md_pool_name, lsm2->lsm_md_pool_name)) |
| return false; |
| |
| for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) { |
| if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid, |
| &lsm2->lsm_md_oinfo[idx].lmo_fid)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| union lmv_mds_md; |
| |
| void lmv_free_memmd(struct lmv_stripe_md *lsm); |
| |
| static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst, |
| const struct lmv_mds_md_v1 *lmv_src) |
| { |
| __u32 i; |
| |
| lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic); |
| lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count); |
| lmv_dst->lmv_master_mdt_index = |
| le32_to_cpu(lmv_src->lmv_master_mdt_index); |
| lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type); |
| lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version); |
| |
| for (i = 0; i < lmv_src->lmv_stripe_count; i++) |
| fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i], |
| &lmv_src->lmv_stripe_fids[i]); |
| } |
| |
| static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst, |
| const union lmv_mds_md *lmv_src) |
| { |
| switch (le32_to_cpu(lmv_src->lmv_magic)) { |
| case LMV_MAGIC_V1: |
| lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* This hash is only for testing purpose */ |
| static inline unsigned int |
| lmv_hash_all_chars(unsigned int count, const char *name, int namelen) |
| { |
| const unsigned char *p = (const unsigned char *)name; |
| unsigned int c = 0; |
| |
| while (--namelen >= 0) |
| c += p[namelen]; |
| |
| c = c % count; |
| |
| return c; |
| } |
| |
| static inline unsigned int |
| lmv_hash_fnv1a(unsigned int count, const char *name, int namelen) |
| { |
| __u64 hash; |
| |
| hash = lustre_hash_fnv_1a_64(name, namelen); |
| |
| return do_div(hash, count); |
| } |
| |
| static inline int lmv_name_to_stripe_index(__u32 lmv_hash_type, |
| unsigned int stripe_count, |
| const char *name, int namelen) |
| { |
| __u32 hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK; |
| int idx; |
| |
| LASSERT(namelen > 0); |
| if (stripe_count <= 1) |
| return 0; |
| |
| /* for migrating object, always start from 0 stripe */ |
| if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION) |
| return 0; |
| |
| switch (hash_type) { |
| case LMV_HASH_TYPE_ALL_CHARS: |
| idx = lmv_hash_all_chars(stripe_count, name, namelen); |
| break; |
| case LMV_HASH_TYPE_FNV_1A_64: |
| idx = lmv_hash_fnv1a(stripe_count, name, namelen); |
| break; |
| default: |
| idx = -EBADFD; |
| break; |
| } |
| CDEBUG(D_INFO, "name %.*s hash_type %d idx %d\n", namelen, name, |
| hash_type, idx); |
| |
| return idx; |
| } |
| |
| static inline bool lmv_is_known_hash_type(__u32 type) |
| { |
| return (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_FNV_1A_64 || |
| (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_ALL_CHARS; |
| } |
| |
| #endif |