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
25 #define DEBUG_SUBSYSTEM S_RPC
27 #include <linux/obd_support.h>
28 #include <linux/lustre_net.h>
30 int lustre_pack_msg(int count, int *lens, char **bufs, int *len,
31 struct lustre_msg **msg)
37 for (i = 0; i < count; i++)
38 size += size_round(lens[i]);
40 *len = size_round(sizeof(*m) + count * sizeof(__u32)) + size;
42 OBD_ALLOC(*msg, *len);
47 m->bufcount = HTON__u32(count);
48 for (i = 0; i < count; i++)
49 m->buflens[i] = HTON__u32(lens[i]);
51 ptr = (char *)m + size_round(sizeof(*m) + count * sizeof(__u32));
52 for (i = 0; i < count; i++) {
56 LOGL(tmp, lens[i], ptr);
62 /* This returns the size of the buffer that is required to hold a lustre_msg
63 * with the given sub-buffer lengths. */
64 int lustre_msg_size(int count, int *lengths)
68 for (i = 0; i < count; i++)
69 size += size_round(lengths[i]);
71 size += size_round(sizeof(struct lustre_msg) + count * sizeof(__u32));
76 int lustre_unpack_msg(struct lustre_msg *m, int len)
81 required_len = size_round(sizeof(*m));
82 if (len < required_len)
85 m->opc = NTOH__u32(m->opc);
86 m->status = NTOH__u32(m->status);
87 m->type = NTOH__u32(m->type);
88 m->bufcount = NTOH__u32(m->bufcount);
89 m->last_xid = NTOH__u64(m->last_xid);
90 m->last_committed = NTOH__u64(m->last_committed);
92 required_len = size_round(sizeof(*m) + m->bufcount * sizeof(__u32));
93 if (len < required_len)
96 for (i = 0; i < m->bufcount; i++) {
97 m->buflens[i] = NTOH__u32(m->buflens[i]);
98 required_len += size_round(m->buflens[i]);
101 if (len < required_len) {
102 CERROR("len: %d, required_len %d\n", len, required_len);
103 CERROR("bufcount: %d\n", m->bufcount);
104 for (i = 0; i < m->bufcount; i++)
105 CERROR("buffer %d length %d\n", i, m->buflens[i]);
112 void *lustre_msg_buf(struct lustre_msg *m, int n)
117 CERROR("no message buffer!\n");
122 if (n < 0 || n >= m->bufcount) {
123 CERROR("referencing bad sub buffer in %p (want %d, count "
124 "%d)!\n", m, n, m->bufcount);
129 if (m->buflens[n] == 0) {
130 CERROR("zero-length buffer requested for buffer %d in %p\n",
135 offset = size_round(sizeof(*m) + m->bufcount * sizeof(__u32));
137 for (i = 0; i < n; i++)
138 offset += size_round(m->buflens[i]);
140 return (char *)m + offset;