1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001 Cluster File Systems, Inc. <braam@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 requests
27 #define DEBUG_SUBSYSTEM S_CLASS
29 #include <linux/obd_class.h>
30 #include <linux/lustre_net.h>
32 int lustre_pack_msg(int count, int *lens, char **bufs, int *len, char **buf)
38 for (i = 0; i < count; i++)
39 size += size_round(lens[i]);
41 *len = sizeof(*m) + count * sizeof(__u32) + size;
43 OBD_ALLOC(*buf, *len);
47 m = (struct lustre_msg *)(*buf);
48 m->bufcount = HTON__u32(count);
49 for (i = 0; i < count; i++)
50 m->buflens[i] = HTON__u32(lens[i]);
52 ptr = *buf + sizeof(*m) + sizeof(__u32) * count;
53 for (i = 0; i < count; i++) {
57 LOGL(tmp, lens[i], ptr);
63 /* This returns the size of the buffer that is required to hold a lustre_msg
64 * with the given sub-buffer lengths. */
65 int lustre_msg_size(int count, int *lengths)
67 int size = sizeof(struct lustre_msg), i;
69 for (i = 0; i < count; i++)
70 size += size_round(lengths[i]);
72 size += count * sizeof(__u32);
77 int lustre_unpack_msg(char *buf, int len)
79 struct lustre_msg *m = (struct lustre_msg *)buf;
82 required_len = sizeof(*m);
83 if (len < required_len)
86 m->opc = NTOH__u32(m->opc);
87 m->xid = NTOH__u32(m->xid);
88 m->status = NTOH__u32(m->status);
89 m->type = NTOH__u32(m->type);
90 m->connid = NTOH__u32(m->connid);
91 m->bufcount = NTOH__u32(m->bufcount);
93 required_len += m->bufcount * sizeof(__u32);
94 if (len < required_len)
97 for (i = 0; i < m->bufcount; i++) {
98 m->buflens[i] = NTOH__u32(m->buflens[i]);
99 required_len += size_round(m->buflens[i]);
102 if (len < required_len) {
103 CERROR("len: %d, required_len %d\n", len, required_len);
110 void *lustre_msg_buf(struct lustre_msg *m, int n)
114 if (n < 0 || n >= m->bufcount) {
115 CERROR("referencing bad sub buffer!\n");
120 if (m->buflens[n] == 0)
123 offset = sizeof(*m) + m->bufcount * sizeof(__u32);
125 for (i = 0; i < n; i++)
126 offset += size_round(m->buflens[i]);
128 return (char *)m + offset;