2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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35 #ifndef _NFS_NFSM_SUBS_H_
36 #define _NFS_NFSM_SUBS_H_
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)
47 * First define what the actual subs. return
49 #define NFSM_DATAP(m, s) (m)->m_data += (s)
52 * Now for the macros that do the simple stuff and call the functions
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.
59 static __inline void *
60 nfsm_build(struct nfsrv_descript *nd, int siz)
65 if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
66 NFSMCLGET(mb2, M_NOWAIT);
68 panic("build > MLEN");
70 nd->nd_bpos = NFSMTOD(mb2, caddr_t);
71 nd->nd_mb->m_next = mb2;
74 retp = (void *)(nd->nd_bpos);
75 nd->nd_mb->m_len += siz;
80 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
82 static __inline void *
83 nfsm_dissect(struct nfsrv_descript *nd, int siz)
88 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
90 retp = (void *)nd->nd_dpos;
93 retp = nfsm_dissct(nd, siz, M_WAITOK);
98 static __inline void *
99 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
104 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
106 retp = (void *)nd->nd_dpos;
109 retp = nfsm_dissct(nd, siz, M_NOWAIT);
114 #define NFSM_DISSECT(a, c, s) \
116 (a) = (c)nfsm_dissect(nd, (s)); \
123 #define NFSM_DISSECT_NONBLOCK(a, c, s) \
125 (a) = (c)nfsm_dissect_nonblock(nd, (s)); \
133 #define NFSM_STRSIZ(s, m) \
135 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
136 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
142 #define NFSM_RNDUP(a) (((a)+3)&(~0x3))
144 #endif /* _NFS_NFSM_SUBS_H_ */