159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NFS_NFSM_SUBS_H_
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#define _NFS_NFSM_SUBS_H_
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/*
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* These macros do strange and peculiar things to mbuf chains for
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* the assistance of the nfs code. To attempt to use them for any
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* other purpose will be dangerous. (they make weird assumptions)
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*/
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#ifndef APPLE
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/*
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* First define what the actual subs. return
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*/
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#define NFSM_DATAP(m, s) (m)->m_data += (s)
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/*
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* Now for the macros that do the simple stuff and call the functions
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* for the hard stuff.
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* They use fields in struct nfsrv_descript to handle the mbuf queues.
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* Replace most of the macro with an inline function, to minimize
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* the machine code. The inline functions in lower case can be called
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* directly, bypassing the macro.
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*/
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static __inline void *
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nfsm_build(struct nfsrv_descript *nd, int siz)
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{
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void *retp;
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struct mbuf *mb2;
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if ((nd->nd_flag & ND_EXTPG) == 0 &&
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siz > M_TRAILINGSPACE(nd->nd_mb)) {
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NFSMCLGET(mb2, M_NOWAIT);
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if (siz > MLEN)
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panic("build > MLEN");
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mb2->m_len = 0;
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nd->nd_bpos = mtod(mb2, char *);
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nd->nd_mb->m_next = mb2;
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nd->nd_mb = mb2;
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} else if ((nd->nd_flag & ND_EXTPG) != 0) {
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if (siz > nd->nd_bextpgsiz) {
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mb2 = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
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nd->nd_bpos = (char *)(void *)
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PHYS_TO_DMAP(mb2->m_epg_pa[0]);
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nd->nd_bextpg = 0;
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nd->nd_bextpgsiz = PAGE_SIZE - siz;
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nd->nd_mb->m_next = mb2;
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nd->nd_mb = mb2;
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} else
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nd->nd_bextpgsiz -= siz;
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nd->nd_mb->m_epg_last_len += siz;
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}
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retp = (void *)(nd->nd_bpos);
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nd->nd_mb->m_len += siz;
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nd->nd_bpos += siz;
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return (retp);
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}
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#define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
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static __inline void *
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nfsm_dissect(struct nfsrv_descript *nd, int siz)
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{
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int tt1;
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void *retp;
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tt1 = mtod(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
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if (tt1 >= siz) {
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retp = (void *)nd->nd_dpos;
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nd->nd_dpos += siz;
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} else {
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retp = nfsm_dissct(nd, siz, M_WAITOK);
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}
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return (retp);
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}
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static __inline void *
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nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
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{
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int tt1;
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void *retp;
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tt1 = mtod(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
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if (tt1 >= siz) {
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retp = (void *)nd->nd_dpos;
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nd->nd_dpos += siz;
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} else {
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retp = nfsm_dissct(nd, siz, M_NOWAIT);
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}
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return (retp);
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}
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#define NFSM_DISSECT(a, c, s) \
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do { \
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(a) = (c)nfsm_dissect(nd, (s)); \
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if ((a) == NULL) { \
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error = EBADRPC; \
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goto nfsmout; \
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} \
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} while (0)
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#define NFSM_DISSECT_NONBLOCK(a, c, s) \
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do { \
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(a) = (c)nfsm_dissect_nonblock(nd, (s)); \
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if ((a) == NULL) { \
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error = EBADRPC; \
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goto nfsmout; \
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} \
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} while (0)
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#endif /* !APPLE */
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#define NFSM_STRSIZ(s, m) \
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do { \
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tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
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if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
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error = EBADRPC; \
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goto nfsmout; \
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} \
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} while (0)
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#define NFSM_RNDUP(a) (((a)+3)&(~0x3))
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#endif /* _NFS_NFSM_SUBS_H_ */
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