2da1527844
This is the first of a series of commits that add support to the NFS client and server for building RPC messages in ext_pgs mbufs with anonymous pages. This is useful so that the entire mbuf list does not need to be copied before calling sosend() when NFS over TLS is enabled. Since ND_EXTPG is never set yet, there is no semantic change at this time.
160 lines
4.7 KiB
C
160 lines
4.7 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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