2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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37 #ifndef _NFS_NFSM_SUBS_H_
38 #define _NFS_NFSM_SUBS_H_
42 * These macros do strange and peculiar things to mbuf chains for
43 * the assistance of the nfs code. To attempt to use them for any
44 * other purpose will be dangerous. (they make weird assumptions)
49 * First define what the actual subs. return
51 #define NFSM_DATAP(m, s) (m)->m_data += (s)
54 * Now for the macros that do the simple stuff and call the functions
56 * They use fields in struct nfsrv_descript to handle the mbuf queues.
57 * Replace most of the macro with an inline function, to minimize
58 * the machine code. The inline functions in lower case can be called
59 * directly, bypassing the macro.
61 static __inline void *
62 nfsm_build(struct nfsrv_descript *nd, int siz)
67 if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
68 NFSMCLGET(mb2, M_NOWAIT);
70 panic("build > MLEN");
72 nd->nd_bpos = NFSMTOD(mb2, caddr_t);
73 nd->nd_mb->m_next = mb2;
76 retp = (void *)(nd->nd_bpos);
77 nd->nd_mb->m_len += siz;
82 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
84 static __inline void *
85 nfsm_dissect(struct nfsrv_descript *nd, int siz)
90 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
92 retp = (void *)nd->nd_dpos;
95 retp = nfsm_dissct(nd, siz, M_WAITOK);
100 static __inline void *
101 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
106 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
108 retp = (void *)nd->nd_dpos;
111 retp = nfsm_dissct(nd, siz, M_NOWAIT);
116 #define NFSM_DISSECT(a, c, s) \
118 (a) = (c)nfsm_dissect(nd, (s)); \
125 #define NFSM_DISSECT_NONBLOCK(a, c, s) \
127 (a) = (c)nfsm_dissect_nonblock(nd, (s)); \
135 #define NFSM_STRSIZ(s, m) \
137 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
138 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
144 #define NFSM_RNDUP(a) (((a)+3)&(~0x3))
146 #endif /* _NFS_NFSM_SUBS_H_ */