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 #ifndef __KERNEL__
  30 #include <liblustre.h>
  31 #else
  32 #include <linux/version.h>
  33 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  34 #include <asm/statfs.h>
  35 #endif
  36 #endif
  37
  38 #include <linux/lustre_export.h>
  39 #include <linux/lustre_net.h>
  40 #include <linux/obd_support.h>
  41 #include <linux/obd_class.h>
  42
  43 void statfs_pack(struct obd_statfs *osfs, struct statfs *sfs)
  44 {
  45         osfs->os_type = sfs->f_type;
  46         osfs->os_blocks = sfs->f_blocks;
  47         osfs->os_bfree = sfs->f_bfree;
  48         osfs->os_bavail = sfs->f_bavail;
  49         osfs->os_files = sfs->f_files;
  50         osfs->os_ffree = sfs->f_ffree;
  51         osfs->os_bsize = sfs->f_bsize;
  52         osfs->os_namelen = sfs->f_namelen;
  53 }
  54
  55 void statfs_unpack(struct statfs *sfs, struct obd_statfs *osfs)
  56 {
  57         sfs->f_type = osfs->os_type;
  58         sfs->f_blocks = osfs->os_blocks;
  59         sfs->f_bfree = osfs->os_bfree;
  60         sfs->f_bavail = osfs->os_bavail;
  61         sfs->f_files = osfs->os_files;
  62         sfs->f_ffree = osfs->os_ffree;
  63         sfs->f_bsize = osfs->os_bsize;
  64         sfs->f_namelen = osfs->os_namelen;
  65 }
  66
  67 int obd_self_statfs(struct obd_device *obd, struct statfs *sfs)
  68 {
  69         struct obd_export *export, *my_export = NULL;
  70         struct obd_statfs osfs = { 0 };
  71         int rc;
  72         ENTRY;
  73
  74         LASSERT( obd != NULL );
  75
  76         spin_lock(&obd->obd_dev_lock);
  77         if (list_empty(&obd->obd_exports)) {
  78                 spin_unlock(&obd->obd_dev_lock);
  79                 export = my_export = class_new_export(obd);
  80                 if (export == NULL)
  81                         RETURN(-ENOMEM);
  82         } else {
  83                 export = list_entry(obd->obd_exports.next, typeof(*export),
  84                                     exp_obd_chain);
  85                 export = class_export_get(export);
  86                 spin_unlock(&obd->obd_dev_lock);
  87         }
  88
  89         rc = obd_statfs(export, &osfs);
  90         if (!rc)
  91                 statfs_unpack(sfs, &osfs);
  92
  93         if (my_export)
  94                 class_unlink_export(my_export);
  95
  96         class_export_put(export);
  97         RETURN(rc);
  98 }
  99
 100 EXPORT_SYMBOL(statfs_pack);
 101 EXPORT_SYMBOL(statfs_unpack);
 102 EXPORT_SYMBOL(obd_self_statfs);