1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc. <adilger@clusterfs.com>
6 * This file is part of Lustre, http://www.lustre.org.
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.
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.
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.
21 * (Un)packing of OST/MDS requests
25 #define DEBUG_SUBSYSTEM S_LLITE
27 #include <linux/lustre_net.h>
28 #include <linux/obd_support.h>
30 void obd_statfs_pack(struct obd_statfs *osfs, struct statfs *sfs)
32 if (osfs == NULL || sfs == NULL)
35 osfs->os_type = HTON__u64(sfs->f_type);
36 osfs->os_blocks = HTON__u64(sfs->f_blocks);
37 osfs->os_bfree = HTON__u64(sfs->f_bfree);
38 osfs->os_bavail = HTON__u64(sfs->f_bavail);
39 osfs->os_files = HTON__u64(sfs->f_files);
40 osfs->os_ffree = HTON__u64(sfs->f_ffree);
41 osfs->os_bsize = HTON__u32(sfs->f_bsize);
42 osfs->os_namelen = HTON__u32(sfs->f_namelen);
45 #if BITS_PER_LONG > 32
46 #define statfs_max(val) val
48 static inline long statfs_max(__u64 val)
50 return ((long)val < val) ? (long)-1 : val;
55 * Note: since linux statfs is limited to a "long" for the statfs
56 * fields, we quickly overflow that. If we wanted, we could start
57 * playing games with the blocksize until the blocks count fit into
58 * a long. Note that it also appears that userspace interprets these
59 * fields as an unsigned long, which is helps us a bit, and it also
60 * appears to do 64-bit math for at least some of the computations.
62 void obd_statfs_unpack(struct obd_statfs *osfs, struct statfs *sfs)
64 if (osfs == NULL || sfs == NULL)
67 sfs->f_type = NTOH__u64(osfs->os_type);
68 sfs->f_blocks = statfs_max(NTOH__u64(osfs->os_blocks));
69 sfs->f_bfree = statfs_max(NTOH__u64(osfs->os_bfree));
70 sfs->f_bavail = statfs_max(NTOH__u64(osfs->os_bavail));
71 sfs->f_files = statfs_max(NTOH__u64(osfs->os_files));
72 sfs->f_ffree = statfs_max(NTOH__u64(osfs->os_ffree));
73 sfs->f_bsize = NTOH__u32(osfs->os_bsize);
74 sfs->f_namelen = NTOH__u32(osfs->os_namelen);