lustre/lib/lov_pack.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002 Cluster File Systems, Inc. <adilger@clusterfs.com>
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * (Un)packing of OST/MDS requests
  22  *
  23  */
  24
  25 #define DEBUG_SUBSYSTEM S_LLITE
  26
  27 #include <linux/lustre_net.h>
  28 #include <linux/obd.h>
  29 #include <linux/obd_support.h>
  30
  31 void lov_packdesc(struct lov_desc *ld)
  32 {
  33         ld->ld_tgt_count = HTON__u32(ld->ld_tgt_count);
  34         ld->ld_default_stripe_count = HTON__u32(ld->ld_default_stripe_count);
  35         ld->ld_default_stripe_size = HTON__u32(ld->ld_default_stripe_size);
  36         ld->ld_pattern = HTON__u32(ld->ld_pattern);
  37 }
  38
  39 void lov_unpackdesc(struct lov_desc *ld)
  40 {
  41         ld->ld_tgt_count = NTOH__u32(ld->ld_tgt_count);
  42         ld->ld_default_stripe_count = HTON__u32(ld->ld_default_stripe_count);
  43         ld->ld_default_stripe_size = HTON__u32(ld->ld_default_stripe_size);
  44         ld->ld_pattern = HTON__u32(ld->ld_pattern);
  45 }
  46
  47 void lov_packmd(struct lov_mds_md *lmm, struct lov_stripe_md *lsm)
  48 {
  49         struct lov_oinfo *loi;
  50         int i;
  51
  52         /* XXX endianness */
  53         lmm->lmm_magic = (lsm->lsm_magic);
  54         lmm->lmm_easize = (lsm->lsm_mds_easize);
  55         lmm->lmm_object_id = (lsm->lsm_object_id);
  56         lmm->lmm_stripe_size = (lsm->lsm_stripe_size);
  57         lmm->lmm_stripe_pattern = (lsm->lsm_stripe_pattern);
  58         lmm->lmm_ost_count = (lsm->lsm_ost_count);
  59         lmm->lmm_stripe_count = (lsm->lsm_stripe_count);
  60         lmm->lmm_stripe_offset = (lsm->lsm_stripe_offset);
  61
  62         /* Only fill in the object ids which we are actually using.
  63          * Assumes lmd_objects is otherwise zero-filled. */
  64         for (i = 0,loi = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++,loi++) {
  65                 lmm->lmm_objects[loi->loi_ost_idx].l_object_id =
  66                         (loi->loi_id);
  67         }
  68 }
  69
  70 void lov_unpackmd(struct lov_stripe_md *lsm, struct lov_mds_md *lmm)
  71 {
  72         struct lov_oinfo *loi;
  73         int ost_count, ost_offset;
  74         int i;
  75
  76         /* XXX endianness */
  77         lsm->lsm_magic = (lmm->lmm_magic);
  78         lsm->lsm_mds_easize = (lmm->lmm_easize);
  79         lsm->lsm_object_id = (lmm->lmm_object_id);
  80         lsm->lsm_stripe_size = (lmm->lmm_stripe_size);
  81         lsm->lsm_stripe_pattern = (lmm->lmm_stripe_pattern);
  82         lsm->lsm_ost_count = (lmm->lmm_ost_count);
  83         lsm->lsm_stripe_count = (lmm->lmm_stripe_count);
  84         lsm->lsm_stripe_offset = (lmm->lmm_stripe_offset);
  85
  86         ost_count = lsm->lsm_ost_count;
  87         ost_offset = lsm->lsm_stripe_offset;
  88
  89         for (i = 0, loi = lsm->lsm_oinfo; i < ost_count; i++, ost_offset++) {
  90                 ost_offset %= ost_count;
  91
  92                 if (!lmm->lmm_objects[ost_offset].l_object_id)
  93                         continue;
  94
  95                 LASSERT(loi - lsm->lsm_oinfo < lsm->lsm_stripe_count);
  96                 loi->loi_id = (lmm->lmm_objects[ost_offset].l_object_id);
  97                 loi->loi_ost_idx = ost_offset;
  98                 loi->loi_size = 0;         /* set by LOV later */
  99                 loi++;
 100         }
 101 }