lustre/obdclass/statfs_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, 2003 Cluster File Systems, Inc.
   5  *   Author: Andreas Dilger <adilger@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * (Un)packing of OST/MDS requests
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_CLASS
  27
  28 #define EXPORT_SYMTAB
  29 #include <linux/lustre_net.h>
  30 #include <linux/obd_support.h>
  31 #include <linux/obd_class.h>
  32
  33 void obd_statfs_pack(struct obd_statfs *tgt, struct obd_statfs *src)
  34 {
  35         tgt->os_type = HTON__u64(src->os_type);
  36         tgt->os_blocks = HTON__u64(src->os_blocks);
  37         tgt->os_bfree = HTON__u64(src->os_bfree);
  38         tgt->os_bavail = HTON__u64(src->os_bavail);
  39         tgt->os_files = HTON__u64(src->os_files);
  40         tgt->os_ffree = HTON__u64(src->os_ffree);
  41         tgt->os_bsize = HTON__u32(src->os_bsize);
  42         tgt->os_namelen = HTON__u32(src->os_namelen);
  43 }
  44
  45 void obd_statfs_unpack(struct obd_statfs *tgt, struct obd_statfs *src)
  46 {
  47         obd_statfs_pack(tgt, src);
  48 }
  49
  50 void statfs_pack(struct obd_statfs *osfs, struct statfs *sfs)
  51 {
  52         osfs->os_type = sfs->f_type;
  53         osfs->os_blocks = sfs->f_blocks;
  54         osfs->os_bfree = sfs->f_bfree;
  55         osfs->os_bavail = sfs->f_bavail;
  56         osfs->os_files = sfs->f_files;
  57         osfs->os_ffree = sfs->f_ffree;
  58         osfs->os_bsize = sfs->f_bsize;
  59         osfs->os_namelen = sfs->f_namelen;
  60 }
  61
  62 void statfs_unpack(struct statfs *sfs, struct obd_statfs *osfs)
  63 {
  64         sfs->f_type = osfs->os_type;
  65         sfs->f_blocks = osfs->os_blocks;
  66         sfs->f_bfree = osfs->os_bfree;
  67         sfs->f_bavail = osfs->os_bavail;
  68         sfs->f_files = osfs->os_files;
  69         sfs->f_ffree = osfs->os_ffree;
  70         sfs->f_bsize = osfs->os_bsize;
  71         sfs->f_namelen = osfs->os_namelen;
  72 }
  73
  74 int obd_self_statfs(struct obd_device *obd, struct statfs *sfs)
  75 {
  76         struct lustre_handle conn;
  77         struct obd_export *export, *my_export = NULL;
  78         struct obd_statfs osfs = { 0 };
  79         int rc;
  80         ENTRY;
  81
  82         if (list_empty(&obd->obd_exports)) {
  83                 export = my_export = class_new_export(obd);
  84                 if (export == NULL)
  85                         RETURN(-ENOMEM);
  86         } else
  87                 export = list_entry(obd->obd_exports.next, typeof(*export),
  88                                     exp_obd_chain);
  89         conn.addr = (unsigned long)export;
  90         conn.cookie = export->exp_cookie;
  91
  92         rc = obd_statfs(&conn, &osfs);
  93         if (!rc)
  94                 statfs_unpack(sfs, &osfs);
  95
  96         if (my_export)
  97                 class_destroy_export(my_export);
  98         RETURN(rc);
  99 }
 100
 101 EXPORT_SYMBOL(obd_statfs_pack);
 102 EXPORT_SYMBOL(obd_statfs_unpack);
 103 EXPORT_SYMBOL(statfs_pack);
 104 EXPORT_SYMBOL(statfs_unpack);
 105 EXPORT_SYMBOL(obd_self_statfs);