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nfsm_subs.h revision 1.1 
      1 /*	$NetBSD: nfsm_subs.h,v 1.1 2013/09/30 07:19:40 dholland Exp $	*/
      2 /*-
      3  * Copyright (c) 1989, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * Rick Macklem at The University of Guelph.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  * FreeBSD: head/sys/fs/nfs/nfsm_subs.h 249592 2013-04-17 21:00:22Z ken
     34  * $NetBSD: nfsm_subs.h,v 1.1 2013/09/30 07:19:40 dholland Exp $
     35  */
     36 
     37 #ifndef _NFS_NFSM_SUBS_H_
     38 #define	_NFS_NFSM_SUBS_H_
     39 
     40 
     41 /*
     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)
     45  */
     46 
     47 #ifndef APPLE
     48 /*
     49  * First define what the actual subs. return
     50  */
     51 #define	M_HASCL(m)	((m)->m_flags & M_EXT)
     52 #define	NFSMINOFF(m) 							\
     53 		if (M_HASCL(m)) 					\
     54 			(m)->m_data = (m)->m_ext.ext_buf; 		\
     55 		else if ((m)->m_flags & M_PKTHDR) 			\
     56 			(m)->m_data = (m)->m_pktdat; 			\
     57 				else 					\
     58 			(m)->m_data = (m)->m_dat
     59 #define	NFSMSIZ(m)	((M_HASCL(m))?MCLBYTES: 			\
     60 				(((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
     61 #define	NFSM_DATAP(m, s)	(m)->m_data += (s)
     62 
     63 /*
     64  * Now for the macros that do the simple stuff and call the functions
     65  * for the hard stuff.
     66  * They use fields in struct nfsrv_descript to handle the mbuf queues.
     67  * Replace most of the macro with an inline function, to minimize
     68  * the machine code. The inline functions in lower case can be called
     69  * directly, bypassing the macro.
     70  */
     71 static __inline void *
     72 nfsm_build(struct nfsrv_descript *nd, int siz)
     73 {
     74 	void *retp;
     75 	struct mbuf *mb2;
     76 
     77 	if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
     78 		NFSMCLGET(mb2, M_NOWAIT);
     79 		if (siz > MLEN)
     80 			panic("build > MLEN");
     81 		mbuf_setlen(mb2, 0);
     82 		nd->nd_bpos = NFSMTOD(mb2, caddr_t);
     83 		nd->nd_mb->m_next = mb2;
     84 		nd->nd_mb = mb2;
     85 	}
     86 	retp = (void *)(nd->nd_bpos);
     87 	nd->nd_mb->m_len += siz;
     88 	nd->nd_bpos += siz;
     89 	return (retp);
     90 }
     91 
     92 #define	NFSM_BUILD(a, c, s)	((a) = (c)nfsm_build(nd, (s)))
     93 
     94 static __inline void *
     95 nfsm_dissect(struct nfsrv_descript *nd, int siz)
     96 {
     97 	int tt1;
     98 	void *retp;
     99 
    100 	tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
    101 	if (tt1 >= siz) {
    102 		retp = (void *)nd->nd_dpos;
    103 		nd->nd_dpos += siz;
    104 	} else {
    105 		retp = nfsm_dissct(nd, siz, M_WAITOK);
    106 	}
    107 	return (retp);
    108 }
    109 
    110 static __inline void *
    111 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
    112 {
    113 	int tt1;
    114 	void *retp;
    115 
    116 	tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos;
    117 	if (tt1 >= siz) {
    118 		retp = (void *)nd->nd_dpos;
    119 		nd->nd_dpos += siz;
    120 	} else {
    121 		retp = nfsm_dissct(nd, siz, M_NOWAIT);
    122 	}
    123 	return (retp);
    124 }
    125 
    126 #define	NFSM_DISSECT(a, c, s) 						\
    127 	do {								\
    128 		(a) = (c)nfsm_dissect(nd, (s));	 			\
    129 		if ((a) == NULL) { 					\
    130 			error = EBADRPC; 				\
    131 			goto nfsmout; 					\
    132 		}							\
    133 	} while (0)
    134 
    135 #define	NFSM_DISSECT_NONBLOCK(a, c, s) 					\
    136 	do {								\
    137 		(a) = (c)nfsm_dissect_nonblock(nd, (s));		\
    138 		if ((a) == NULL) { 					\
    139 			error = EBADRPC; 				\
    140 			goto nfsmout; 					\
    141 		}							\
    142 	} while (0)
    143 #endif	/* !APPLE */
    144 
    145 #define	NFSM_STRSIZ(s, m)  						\
    146 	do {								\
    147 		tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED);	\
    148 		if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
    149 			error = EBADRPC; 				\
    150 			goto nfsmout; 					\
    151 		}							\
    152 	} while (0)
    153 
    154 #define	NFSM_RNDUP(a)	(((a)+3)&(~0x3))
    155 
    156 #endif	/* _NFS_NFSM_SUBS_H_ */
    157