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: releng/9.0/sys/fs/nfs/nfsm_subs.h 191783 2009-05-04 15:23:58Z rmacklem $
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 M_HASCL(m) ((m)->m_flags & M_EXT)
50 #define NFSMINOFF(m) \
51 if (M_HASCL(m)) \
52 (m)->m_data = (m)->m_ext.ext_buf; \
53 else if ((m)->m_flags & M_PKTHDR) \
54 (m)->m_data = (m)->m_pktdat; \
55 else \
56 (m)->m_data = (m)->m_dat
57 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \
58 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
59 #define NFSM_DATAP(m, s) (m)->m_data += (s)
60
61 /*
62 * Now for the macros that do the simple stuff and call the functions
63 * for the hard stuff.
64 * They use fields in struct nfsrv_descript to handle the mbuf queues.
65 * Replace most of the macro with an inline function, to minimize
66 * the machine code. The inline functions in lower case can be called
67 * directly, bypassing the macro.
68 */
69 static __inline void *
70 nfsm_build(struct nfsrv_descript *nd, int siz)
71 {
72 void *retp;
73 struct mbuf *mb2;
74
75 if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
76 NFSMCLGET(mb2, M_DONTWAIT);
77 if (siz > MLEN)
78 panic("build > MLEN");
79 mbuf_setlen(mb2, 0);
80 nd->nd_bpos = NFSMTOD(mb2, caddr_t);
81 nd->nd_mb->m_next = mb2;
82 nd->nd_mb = mb2;
83 }
84 retp = (void *)(nd->nd_bpos);
85 nd->nd_mb->m_len += siz;
86 nd->nd_bpos += siz;
87 return (retp);
88 }
89
90 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
91
92 static __inline void *
93 nfsm_dissect(struct nfsrv_descript *nd, int siz)
94 {
95 int tt1;
96 void *retp;
97
98 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
99 if (tt1 >= siz) {
100 retp = (void *)nd->nd_dpos;
101 nd->nd_dpos += siz;
102 } else {
103 retp = nfsm_dissct(nd, siz);
104 }
105 return (retp);
106 }
107
108 #define NFSM_DISSECT(a, c, s) \
109 do { \
110 (a) = (c)nfsm_dissect(nd, (s)); \
111 if ((a) == NULL) { \
112 error = EBADRPC; \
113 goto nfsmout; \
114 } \
115 } while (0)
116 #endif /* !APPLE */
117
118 #define NFSM_STRSIZ(s, m) \
119 do { \
120 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
121 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
122 error = EBADRPC; \
123 goto nfsmout; \
124 } \
125 } while (0)
126
127 #define NFSM_RNDUP(a) (((a)+3)&(~0x3))
128
129 #endif /* _NFS_NFSM_SUBS_H_ */
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