lustre/include/lustre_lmv.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/include/lustre_lmv.h
  27  *
  28  * Lustre LMV structures and functions.
  29  *
  30  * Author: Di Wang <di.wang@intel.com>
  31  */
  32
  33 #ifndef _LUSTRE_LMV_H
  34 #define _LUSTRE_LMV_H
  35 #include <lustre/lustre_idl.h>
  36
  37 struct lmv_oinfo {
  38         struct lu_fid   lmo_fid;
  39         mdsno_t         lmo_mds;
  40         struct inode    *lmo_root;
  41 };
  42
  43 struct lmv_stripe_md {
  44         __u32   lsm_md_magic;
  45         __u32   lsm_md_stripe_count;
  46         __u32   lsm_md_master_mdt_index;
  47         __u32   lsm_md_hash_type;
  48         __u32   lsm_md_layout_version;
  49         __u32   lsm_md_default_count;
  50         __u32   lsm_md_default_index;
  51         struct lu_fid   lsm_md_master_fid;
  52         char    lsm_md_pool_name[LOV_MAXPOOLNAME];
  53         struct lmv_oinfo lsm_md_oinfo[0];
  54 };
  55
  56 static inline bool
  57 lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
  58 {
  59         int idx;
  60
  61         if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
  62             lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
  63             lsm1->lsm_md_master_mdt_index !=
  64                                 lsm2->lsm_md_master_mdt_index ||
  65             lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
  66             lsm1->lsm_md_layout_version !=
  67                                 lsm2->lsm_md_layout_version ||
  68             strcmp(lsm1->lsm_md_pool_name,
  69                       lsm2->lsm_md_pool_name) != 0)
  70                 return false;
  71
  72         for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
  73                 if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
  74                                &lsm2->lsm_md_oinfo[idx].lmo_fid))
  75                         return false;
  76         }
  77
  78         return true;
  79 }
  80 union lmv_mds_md;
  81
  82 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
  83                        int stripe_count);
  84 int lmv_alloc_md(union lmv_mds_md **lmmp, int stripe_count);
  85 void lmv_free_md(union lmv_mds_md *lmm);
  86 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripe_count);
  87 void lmv_free_memmd(struct lmv_stripe_md *lsm);
  88
  89 static inline void lmv1_cpu_to_le(struct lmv_mds_md_v1 *lmv_dst,
  90                                   const struct lmv_mds_md_v1 *lmv_src)
  91 {
  92         int i;
  93
  94         lmv_dst->lmv_magic = cpu_to_le32(lmv_src->lmv_magic);
  95         lmv_dst->lmv_stripe_count = cpu_to_le32(lmv_src->lmv_stripe_count);
  96         lmv_dst->lmv_master_mdt_index =
  97                         cpu_to_le32(lmv_src->lmv_master_mdt_index);
  98         lmv_dst->lmv_hash_type = cpu_to_le32(lmv_src->lmv_hash_type);
  99         lmv_dst->lmv_layout_version = cpu_to_le32(lmv_src->lmv_layout_version);
 100         for (i = 0; i < lmv_src->lmv_stripe_count; i++)
 101                 fid_cpu_to_le(&lmv_dst->lmv_stripe_fids[i],
 102                               &lmv_src->lmv_stripe_fids[i]);
 103 }
 104
 105 static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
 106                                   const struct lmv_mds_md_v1 *lmv_src)
 107 {
 108         int i;
 109
 110         lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
 111         lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
 112         lmv_dst->lmv_master_mdt_index =
 113                                 le32_to_cpu(lmv_src->lmv_master_mdt_index);
 114         lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
 115         lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
 116         for (i = 0; i < lmv_src->lmv_stripe_count; i++)
 117                 fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
 118                               &lmv_src->lmv_stripe_fids[i]);
 119 }
 120
 121 static inline void lmv_cpu_to_le(union lmv_mds_md *lmv_dst,
 122                                  const union lmv_mds_md *lmv_src)
 123 {
 124         switch (lmv_src->lmv_magic) {
 125         case LMV_MAGIC_V1:
 126                 lmv1_cpu_to_le(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
 127                 break;
 128         default:
 129                 break;
 130         }
 131 }
 132
 133 static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
 134                                  const union lmv_mds_md *lmv_src)
 135 {
 136         switch (le32_to_cpu(lmv_src->lmv_magic)) {
 137         case LMV_MAGIC_V1:
 138                 lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
 139                 break;
 140         default:
 141                 break;
 142         }
 143 }
 144
 145 #endif