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 *tgt, struct obd_statfs *src)
32 tgt->os_type = HTON__u64(src->os_type);
33 tgt->os_blocks = HTON__u64(src->os_blocks);
34 tgt->os_bfree = HTON__u64(src->os_bfree);
35 tgt->os_bavail = HTON__u64(src->os_bavail);
36 tgt->os_files = HTON__u64(src->os_files);
37 tgt->os_ffree = HTON__u64(src->os_ffree);
38 tgt->os_bsize = HTON__u32(src->os_bsize);
39 tgt->os_namelen = HTON__u32(src->os_namelen);
42 #define obd_statfs_unpack(tgt, src) obd_statfs_pack(tgt, src)
44 void statfs_pack(struct obd_statfs *osfs, struct statfs *sfs)
46 osfs->os_type = sfs->f_type;
47 osfs->os_blocks = sfs->f_blocks;
48 osfs->os_bfree = sfs->f_bfree;
49 osfs->os_bavail = sfs->f_bavail;
50 osfs->os_files = sfs->f_files;
51 osfs->os_ffree = sfs->f_ffree;
52 osfs->os_bsize = sfs->f_bsize;
53 osfs->os_namelen = sfs->f_namelen;
56 #if BITS_PER_LONG > 32
57 #define statfs_max(val) val
59 static inline long statfs_max(__u64 val)
61 return ((long)val < val) ? (long)-1 : val;
66 * Note: since linux statfs is limited to a "long" for the statfs
67 * fields, we quickly overflow that. If we wanted, we could start
68 * playing games with the blocksize until the blocks count fit into
69 * a long. Note that it also appears that userspace interprets these
70 * fields as an unsigned long, which is helps us a bit, and it also
71 * appears to do 64-bit math for at least some of the computations.
73 void statfs_unpack(struct statfs *sfs, struct obd_statfs *osfs)
75 sfs->f_type = osfs->os_type;
76 sfs->f_blocks = statfs_max(osfs->os_blocks);
77 sfs->f_bfree = statfs_max(osfs->os_bfree);
78 sfs->f_bavail = statfs_max(osfs->os_bavail);
79 sfs->f_files = statfs_max(osfs->os_files);
80 sfs->f_ffree = statfs_max(osfs->os_ffree);
81 sfs->f_bsize = osfs->os_bsize;
82 sfs->f_namelen = osfs->os_namelen;