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freebsd/sys/nfs/nfs_common.h
Poul-Henning Kamp 6ae324074a This is a bunch of changes from NetBSD. There are a couple of bug-fixes.
But mostly it is changes to use the list-maintenance macros instead of
doing the pointer-gymnastics by hand.

Obtained from: NetBSD
1994-10-17 17:47:45 +00:00

287 lines
8.4 KiB
C

/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 8.1 (Berkeley) 6/16/93
* $Id: nfsm_subs.h,v 1.4 1994/10/02 17:27:05 phk Exp $
*/
#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
*/
extern struct mbuf *nfsm_reqh();
#define M_HASCL(m) ((m)->m_flags & M_EXT)
#define NFSMINOFF(m) \
if (M_HASCL(m)) \
(m)->m_data = (m)->m_ext.ext_buf; \
else if ((m)->m_flags & M_PKTHDR) \
(m)->m_data = (m)->m_pktdat; \
else \
(m)->m_data = (m)->m_dat
#define NFSMADV(m, s) (m)->m_data += (s)
#define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \
(((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_build(a,c,s) \
{ if ((s) > M_TRAILINGSPACE(mb)) { \
MGET(mb2, M_WAIT, MT_DATA); \
if ((s) > MLEN) \
panic("build > MLEN"); \
mb->m_next = mb2; \
mb = mb2; \
mb->m_len = 0; \
bpos = mtod(mb, caddr_t); \
} \
(a) = (c)(bpos); \
mb->m_len += (s); \
bpos += (s); }
#define nfsm_dissect(a,c,s) \
{ t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
(a) = (c)(dpos); \
dpos += (s); \
} else { \
error = nfsm_disct(&md, &dpos, (s), t1, &cp2); \
if (error) { \
m_freem(mrep); \
goto nfsmout; \
} else { \
(a) = (c)cp2; \
} \
} }
#define nfsm_fhtom(v) \
nfsm_build(cp,caddr_t,NFSX_FH); \
bcopy((caddr_t)&(VTONFS(v)->n_fh), cp, NFSX_FH)
#define nfsm_srvfhtom(f) \
nfsm_build(cp,caddr_t,NFSX_FH); \
bcopy((caddr_t)(f), cp, NFSX_FH)
#define nfsm_mtofh(d,v) \
{ struct nfsnode *np; nfsv2fh_t *fhp; \
nfsm_dissect(fhp,nfsv2fh_t *,NFSX_FH); \
error = nfs_nget((d)->v_mount, fhp, &np); \
if (error) { \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = NFSTOV(np); \
nfsm_loadattr(v, (struct vattr *)0); \
}
#define nfsm_loadattr(v,a) \
{ struct vnode *tvp = (v); \
error = nfs_loadattrcache(&tvp, &md, &dpos, (a)); \
if (error) { \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = tvp; }
#define nfsm_strsiz(s,m) \
{ nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(long,*tl)) > (m)) { \
m_freem(mrep); \
error = EBADRPC; \
goto nfsmout; \
} }
#define nfsm_srvstrsiz(s,m) \
{ nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(long,*tl)) > (m) || (s) <= 0) { \
error = EBADRPC; \
nfsm_reply(0); \
} }
#define nfsm_mtouio(p,s) \
if ((s) > 0 && \
(error = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \
m_freem(mrep); \
goto nfsmout; \
}
#define nfsm_uiotom(p,s) \
error = nfsm_uiotombuf((p),&mb,(s),&bpos); \
if (error) { \
m_freem(mreq); \
goto nfsmout; \
}
#define nfsm_reqhead(v,a,s) \
mb = mreq = nfsm_reqh((v),(a),(s),&bpos)
#define nfsm_reqdone m_freem(mrep); \
nfsmout:
#define nfsm_rndup(a) (((a)+3)&(~0x3))
#define nfsm_request(v, t, p, c) \
error = nfs_request((v), mreq, (t), (p), \
(c), &mrep, &md, &dpos); \
if (error) \
goto nfsmout
#define nfsm_strtom(a,s,m) \
if ((s) > (m)) { \
m_freem(mreq); \
error = ENAMETOOLONG; \
goto nfsmout; \
} \
t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \
if (t2 <= M_TRAILINGSPACE(mb)) { \
nfsm_build(tl,u_long *,t2); \
*tl++ = txdr_unsigned(s); \
*(tl+((t2>>2)-2)) = 0; \
bcopy((caddr_t)(a), (caddr_t)tl, (s)); \
} else { \
error = nfsm_strtmbuf(&mb, &bpos, (a), (s)); \
if (error) { \
m_freem(mreq); \
goto nfsmout; \
} \
}
#define nfsm_srvdone \
nfsmout: \
return(error)
#define nfsm_reply(s) \
{ \
nfsd->nd_repstat = error; \
if (error) \
(void) nfs_rephead(0, nfsd, error, cache, &frev, \
mrq, &mb, &bpos); \
else \
(void) nfs_rephead((s), nfsd, error, cache, &frev, \
mrq, &mb, &bpos); \
m_freem(mrep); \
mreq = *mrq; \
if (error) \
return(0); \
}
#define nfsm_adv(s) \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
dpos += (s); \
} else { \
error = nfs_adv(&md, &dpos, (s), t1); \
if (error) { \
m_freem(mrep); \
goto nfsmout; \
} \
}
#define nfsm_srvmtofh(f) \
nfsm_dissect(tl, u_long *, NFSX_FH); \
bcopy((caddr_t)tl, (caddr_t)f, NFSX_FH)
#define nfsm_clget \
if (bp >= be) { \
if (mp == mb) \
mp->m_len += bp-bpos; \
MGET(mp, M_WAIT, MT_DATA); \
MCLGET(mp, M_WAIT); \
mp->m_len = NFSMSIZ(mp); \
mp2->m_next = mp; \
mp2 = mp; \
bp = mtod(mp, caddr_t); \
be = bp+mp->m_len; \
} \
tl = (u_long *)bp
#define nfsm_srvfillattr \
fp->fa_type = vtonfs_type(vap->va_type); \
fp->fa_mode = vtonfs_mode(vap->va_type, vap->va_mode); \
fp->fa_nlink = txdr_unsigned(vap->va_nlink); \
fp->fa_uid = txdr_unsigned(vap->va_uid); \
fp->fa_gid = txdr_unsigned(vap->va_gid); \
if (nfsd->nd_nqlflag == NQL_NOVAL) { \
fp->fa_nfsblocksize = txdr_unsigned(vap->va_blocksize); \
if (vap->va_type == VFIFO) \
fp->fa_nfsrdev = 0xffffffff; \
else \
fp->fa_nfsrdev = txdr_unsigned(vap->va_rdev); \
fp->fa_nfsfsid = txdr_unsigned(vap->va_fsid); \
fp->fa_nfsfileid = txdr_unsigned(vap->va_fileid); \
fp->fa_nfssize = txdr_unsigned(vap->va_size); \
fp->fa_nfsblocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); \
txdr_nfstime(&vap->va_atime, &fp->fa_nfsatime); \
txdr_nfstime(&vap->va_mtime, &fp->fa_nfsmtime); \
txdr_nfstime(&vap->va_ctime, &fp->fa_nfsctime); \
} else { \
fp->fa_nqblocksize = txdr_unsigned(vap->va_blocksize); \
if (vap->va_type == VFIFO) \
fp->fa_nqrdev = 0xffffffff; \
else \
fp->fa_nqrdev = txdr_unsigned(vap->va_rdev); \
fp->fa_nqfsid = txdr_unsigned(vap->va_fsid); \
fp->fa_nqfileid = txdr_unsigned(vap->va_fileid); \
txdr_hyper(&vap->va_size, &fp->fa_nqsize); \
txdr_hyper(&vap->va_bytes, &fp->fa_nqbytes); \
txdr_nqtime(&vap->va_atime, &fp->fa_nqatime); \
txdr_nqtime(&vap->va_mtime, &fp->fa_nqmtime); \
txdr_nqtime(&vap->va_ctime, &fp->fa_nqctime); \
fp->fa_nqflags = txdr_unsigned(vap->va_flags); \
fp->fa_nqgen = txdr_unsigned(vap->va_gen); \
txdr_hyper(&vap->va_filerev, &fp->fa_nqfilerev); \
}
#endif