OpenBSD-4.6/sys/nfs/nfsm_subs.h
/* $OpenBSD: nfsm_subs.h,v 1.38 2009/06/06 00:33:51 thib Exp $ */
/* $NetBSD: nfsm_subs.h,v 1.10 1996/03/20 21:59:56 fvdl Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95
*/
#ifndef _NFS_NFSM_SUBS_H_
#define _NFS_NFSM_SUBS_H_
/*
* These macros do strange and peculiar things to mbuf chains for
* the assistance of the nfs code. To attempt to use them for any
* other purpose will be dangerous. (they make weird assumptions)
*/
/*
* First define what the actual subs. return
*/
#define M_HASCL(m) ((m)->m_flags & M_EXT)
#define NFSMSIZ(m) ((M_HASCL(m)) ? (m)->m_ext.ext_size : \
(((m)->m_flags & M_PKTHDR) ? MHLEN : MLEN))
/*
* Now for the macros that do the simple stuff and call the functions
* for the hard stuff.
* These macros use several vars. declared in nfsm_reqhead and these
* vars. must not be used elsewhere unless you are careful not to corrupt
* them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
* that may be used so long as the value is not expected to retained
* after a macro.
* I know, this is kind of dorkey, but it makes the actual op functions
* fairly clean and deals with the mess caused by the xdr discriminating
* unions.
*/
#define nfsm_dissect(a, c, s) { \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
(a) = (c)(dpos); \
dpos += (s); \
} else if ((t1 = \
nfsm_disct(&md, &dpos, (s), t1, &cp2)) != 0) { \
error = t1; \
m_freem(mrep); \
goto nfsmout; \
} else { \
(a) = (c)cp2; \
} \
}
#define nfsm_srvpostop_fh(f) { \
tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED + NFSX_V3FH); \
*tl++ = nfs_true; \
*tl++ = txdr_unsigned(NFSX_V3FH); \
bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \
}
#define nfsm_mtofh(d, v, v3, f) { \
struct nfsnode *ttnp; nfsfh_t *ttfhp; int ttfhsize; \
if (v3) { \
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
(f) = fxdr_unsigned(int, *tl); \
} else \
(f) = 1; \
if (f) { \
nfsm_getfh(ttfhp, ttfhsize, (v3)); \
if ((t1 = nfs_nget((d)->v_mount, ttfhp, ttfhsize, \
&ttnp)) != 0) { \
error = t1; \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = NFSTOV(ttnp); \
} \
if (v3) { \
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
if (f) \
(f) = fxdr_unsigned(int, *tl); \
else if (fxdr_unsigned(int, *tl)) \
nfsm_adv(NFSX_V3FATTR); \
} \
if (f) \
nfsm_loadattr((v), (struct vattr *)0); \
}
#define nfsm_getfh(f, s, v3) { \
if (v3) { \
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(int, *tl)) <= 0 || \
(s) > NFSX_V3FHMAX) { \
m_freem(mrep); \
error = EBADRPC; \
goto nfsmout; \
} \
} else \
(s) = NFSX_V2FH; \
nfsm_dissect((f), nfsfh_t *, nfsm_rndup(s)); \
}
#define nfsm_loadattr(v, a) { \
struct vnode *ttvp = (v); \
if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, (a))) != 0) { \
error = t1; \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = ttvp; \
}
#define nfsm_postop_attr(v, f) { \
struct vnode *ttvp = (v); \
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
if (((f) = fxdr_unsigned(int, *tl)) != 0) { \
if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, \
(struct vattr *)0)) != 0) { \
error = t1; \
(f) = 0; \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = ttvp; \
} \
}
/* Used as (f) for nfsm_wcc_data() */
#define NFSV3_WCCRATTR 0
#define NFSV3_WCCCHK 1
#define nfsm_wcc_data(v, f) do { \
struct timespec _mtime; \
int ttattrf, ttretf = 0; \
\
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
if (*tl == nfs_true) { \
nfsm_dissect(tl, u_int32_t *, 6 * NFSX_UNSIGNED); \
fxdr_nfsv3time(tl + 2, &_mtime); \
if (f) { \
ttretf = timespeccmp(&VTONFS(v)->n_mtime, \
&_mtime, !=); \
} \
} \
nfsm_postop_attr((v), ttattrf); \
if (f) { \
(f) = ttretf; \
} else { \
(f) = ttattrf; \
} \
} while (0)
#define nfsm_strsiz(s,m) { \
nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(int32_t,*tl)) > (m)) { \
m_freem(mrep); \
error = EBADRPC; \
goto nfsmout; \
} \
}
#define nfsm_srvnamesiz(s) { \
nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(int32_t,*tl)) > NFS_MAXNAMLEN) \
error = NFSERR_NAMETOL; \
if ((s) <= 0) \
error = EBADRPC; \
if (error) \
nfsm_reply(0); \
}
#define nfsm_mtouio(p,s) \
if ((s) > 0 && \
(t1 = nfsm_mbuftouio(&md,(p),(s),&dpos)) != 0) { \
error = t1; \
m_freem(mrep); \
goto nfsmout; \
}
#define nfsm_rndup(a) (((a)+3)&(~0x3))
#define nfsm_strtom(a,s,m) \
if ((s) > (m)) { \
m_freem(mreq); \
error = ENAMETOOLONG; \
goto nfsmout; \
} \
nfsm_strtombuf(&mb, (a), (s))
#define nfsm_reply(s) { \
nfsd->nd_repstat = error; \
if (error && !(nfsd->nd_flag & ND_NFSV3)) \
(void) nfs_rephead(0, nfsd, slp, error, \
mrq, &mb); \
else \
(void) nfs_rephead((s), nfsd, slp, error, \
mrq, &mb); \
if (mrep != NULL) { \
m_freem(mrep); \
mrep = NULL; \
} \
mreq = *mrq; \
if (error && (!(nfsd->nd_flag & ND_NFSV3) || error == EBADRPC)) \
return(0); \
}
#define nfsm_writereply(s, v3) { \
nfsd->nd_repstat = error; \
if (error && !(v3)) \
(void) nfs_rephead(0, nfsd, slp, error, &mreq, &mb); \
else \
(void) nfs_rephead((s), nfsd, slp, error, &mreq, &mb); \
}
#define nfsm_adv(s) { \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
dpos += (s); \
} else if ((t1 = nfs_adv(&md, &dpos, (s), t1)) != 0) { \
error = t1; \
m_freem(mrep); \
goto nfsmout; \
} \
}
#define nfsm_srvmtofh(f) { \
if (nfsd->nd_flag & ND_NFSV3) { \
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \
if (fxdr_unsigned(int, *tl) != NFSX_V3FH) { \
error = EBADRPC; \
nfsm_reply(0); \
} \
} \
nfsm_dissect(tl, u_int32_t *, NFSX_V3FH); \
bcopy((caddr_t)tl, (caddr_t)(f), NFSX_V3FH); \
if ((nfsd->nd_flag & ND_NFSV3) == 0) \
nfsm_adv(NFSX_V2FH - NFSX_V3FH); \
}
#endif