Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | /*
* 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 "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;
int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
const union lmv_mds_md *lmm, int stripe_count);
static inline int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripe_count)
{
return lmv_unpack_md(NULL, lsmp, NULL, stripe_count);
}
static inline void lmv_free_memmd(struct lmv_stripe_md *lsm)
{
lmv_unpack_md(NULL, &lsm, NULL, 0);
}
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
|