FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/nfsm_subs.h
1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD$
33 */
34
35 #ifndef _NFS_NFSM_SUBS_H_
36 #define _NFS_NFSM_SUBS_H_
37
38
39 /*
40 * These macros do strange and peculiar things to mbuf chains for
41 * the assistance of the nfs code. To attempt to use them for any
42 * other purpose will be dangerous. (they make weird assumptions)
43 */
44
45 #ifndef APPLE
46 /*
47 * First define what the actual subs. return
48 */
49 #define NFSM_DATAP(m, s) (m)->m_data += (s)
50
51 /*
52 * Now for the macros that do the simple stuff and call the functions
53 * for the hard stuff.
54 * They use fields in struct nfsrv_descript to handle the mbuf queues.
55 * Replace most of the macro with an inline function, to minimize
56 * the machine code. The inline functions in lower case can be called
57 * directly, bypassing the macro.
58 */
59 static __inline void *
60 nfsm_build(struct nfsrv_descript *nd, int siz)
61 {
62 void *retp;
63 struct mbuf *mb2;
64
65 if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
66 NFSMCLGET(mb2, M_NOWAIT);
67 if (siz > MLEN)
68 panic("build > MLEN");
69 mbuf_setlen(mb2, 0);
70 nd->nd_bpos = NFSMTOD(mb2, caddr_t);
71 nd->nd_mb->m_next = mb2;
72 nd->nd_mb = mb2;
73 }
74 retp = (void *)(nd->nd_bpos);
75 nd->nd_mb->m_len += siz;
76 nd->nd_bpos += siz;
77 return (retp);
78 }
79
80 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
81
82 static __inline void *
83 nfsm_dissect(struct nfsrv_descript *nd, int siz)
84 {
85 int tt1;
86 void *retp;
87
88 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
89 if (tt1 >= siz) {
90 retp = (void *)nd->nd_dpos;
91 nd->nd_dpos += siz;
92 } else {
93 retp = nfsm_dissct(nd, siz, M_WAITOK);
94 }
95 return (retp);
96 }
97
98 static __inline void *
99 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
100 {
101 int tt1;
102 void *retp;
103
104 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
105 if (tt1 >= siz) {
106 retp = (void *)nd->nd_dpos;
107 nd->nd_dpos += siz;
108 } else {
109 retp = nfsm_dissct(nd, siz, M_NOWAIT);
110 }
111 return (retp);
112 }
113
114 #define NFSM_DISSECT(a, c, s) \
115 do { \
116 (a) = (c)nfsm_dissect(nd, (s)); \
117 if ((a) == NULL) { \
118 error = EBADRPC; \
119 goto nfsmout; \
120 } \
121 } while (0)
122
123 #define NFSM_DISSECT_NONBLOCK(a, c, s) \
124 do { \
125 (a) = (c)nfsm_dissect_nonblock(nd, (s)); \
126 if ((a) == NULL) { \
127 error = EBADRPC; \
128 goto nfsmout; \
129 } \
130 } while (0)
131 #endif /* !APPLE */
132
133 #define NFSM_STRSIZ(s, m) \
134 do { \
135 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
136 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
137 error = EBADRPC; \
138 goto nfsmout; \
139 } \
140 } while (0)
141
142 #define NFSM_RNDUP(a) (((a)+3)&(~0x3))
143
144 #endif /* _NFS_NFSM_SUBS_H_ */
Cache object: 6020b53d9770c7dc88192b284f501c1a
|