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"update from Rick Macklem"
[unix-history] / usr / src / sys / nfs / nfsm_subs.h
/*
* Copyright (c) 1989 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 are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)nfsm_subs.h 7.9 (Berkeley) %G%
*/
/*
* 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 NFSMGETHDR(m) \
MGETHDR(m, M_WAIT, MT_DATA); \
(m)->m_pkthdr.len = 0; \
(m)->m_pkthdr.rcvif = (struct ifnet *)0
#define NFSMINOFF(m) \
if (M_HASCL(m)) \
(m)->m_data = (m)->m_ext.ext_buf; \
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.
*/
#ifndef lint
#define nfsm_build(a,c,s) \
t1 = NFSMSIZ(mb); \
if ((s) > (t1-mb->m_len)) { \
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)
#else /* lint */
#define nfsm_build(a,c,s) \
t1 = NFSMSIZ(mb); \
if ((s) > (t1-mb->m_len)) { \
MGET(mb2, M_WAIT, MT_DATA); \
mb->m_next = mb2; \
mb = mb2; \
mb->m_len = 0; \
bpos = mtod(mb, caddr_t); \
} \
(a) = (c)(bpos); \
mb->m_len += (s); \
bpos += (s)
#endif /* lint */
#define nfsm_disect(a,c,s) \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
(a) = (c)(dpos); \
dpos += (s); \
} else if (error = nfsm_disct(&md, &dpos, (s), t1, TRUE, &cp2)) { \
m_freem(mrep); \
goto nfsmout; \
} else { \
(a) = (c)cp2; \
}
#define nfsm_disecton(a,c,s) \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
(a) = (c)(dpos); \
dpos += (s); \
} else if (error = nfsm_disct(&md, &dpos, (s), t1, FALSE, &cp2)) { \
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_disect(fhp,nfsv2fh_t *,NFSX_FH); \
if (error = nfs_nget((d)->v_mount, fhp, &np)) { \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = NFSTOV(np); \
nfsm_loadattr(v, (struct vattr *)0); \
}
#define nfsm_loadattr(v,a) \
{ struct vnode *tvp = (v); \
if (error = nfs_loadattrcache(&tvp, &md, &dpos, (a))) { \
m_freem(mrep); \
goto nfsmout; \
} \
(v) = tvp; }
#define nfsm_strsiz(s,m) \
nfsm_disect(p,u_long *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(long,*p)) > (m)) { \
m_freem(mrep); \
error = EBADRPC; \
goto nfsmout; \
}
#define nfsm_srvstrsiz(s,m) \
nfsm_disect(p,u_long *,NFSX_UNSIGNED); \
if (((s) = fxdr_unsigned(long,*p)) > (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) \
if (error = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \
m_freem(mreq); \
goto nfsmout; \
}
#define nfsm_reqhead(a,c,s) \
if ((mreq = nfsm_reqh(nfs_prog,nfs_vers,(a),(c),(s),&bpos,&mb,&xid)) == NULL) { \
error = ENOBUFS; \
goto nfsmout; \
}
#define nfsm_reqdone m_freem(mrep); \
nfsmout:
#define nfsm_rndup(a) (((a)+3)&(~0x3))
#define nfsm_request(v, t, p, h) \
if (error = nfs_request((v), mreq, xid, (t), (p), (h), \
(v)->v_mount, &mrep, &md, &dpos)) \
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<=(NFSMSIZ(mb)-mb->m_len)){ \
nfsm_build(p,u_long *,t2); \
*p++ = txdr_unsigned(s); \
*(p+((t2>>2)-2)) = 0; \
bcopy((caddr_t)(a), (caddr_t)p, (s)); \
} else if (error = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \
m_freem(mreq); \
goto nfsmout; \
}
#define nfsm_srvdone \
nfsmout: \
return(error)
#ifndef lint
#define nfsm_reply(s) \
{ \
*repstat = error; \
if (error) \
nfs_rephead(0, xid, error, mrq, &mb, &bpos); \
else \
nfs_rephead((s), xid, error, mrq, &mb, &bpos); \
m_freem(mrep); \
mreq = *mrq; \
if (error) \
return(0); \
}
#else /* lint */
#define nfsm_reply(s) \
{ \
*repstat = error; \
if (error) \
nfs_rephead(0, xid, error, mrq, &mb, &bpos); \
else \
nfs_rephead((s), xid, error, mrq, &mb, &bpos); \
m_freem(mrep); \
mreq = *mrq; \
mrep = mreq; \
if (error) \
return(0); \
}
#endif /* lint */
#define nfsm_adv(s) \
t1 = mtod(md, caddr_t)+md->m_len-dpos; \
if (t1 >= (s)) { \
dpos += (s); \
} else if (error = nfs_adv(&md, &dpos, (s), t1)) { \
m_freem(mrep); \
goto nfsmout; \
}
#define nfsm_srvmtofh(f) \
nfsm_disecton(p, u_long *, NFSX_FH); \
bcopy((caddr_t)p, (caddr_t)f, NFSX_FH)
#define nfsm_clget \
if (bp >= be) { \
MGET(mp, M_WAIT, MT_DATA); \
MCLGET(mp, M_WAIT); \
mp->m_len = NFSMSIZ(mp); \
if (mp3 == NULL) \
mp3 = mp2 = mp; \
else { \
mp2->m_next = mp; \
mp2 = mp; \
} \
bp = mtod(mp, caddr_t); \
be = bp+mp->m_len; \
} \
p = (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); \
fp->fa_size = txdr_unsigned(vap->va_size); \
fp->fa_blocksize = txdr_unsigned(vap->va_blocksize); \
if (vap->va_type == VFIFO) \
fp->fa_rdev = 0xffffffff; \
else \
fp->fa_rdev = txdr_unsigned(vap->va_rdev); \
fp->fa_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); \
fp->fa_fsid = txdr_unsigned(vap->va_fsid); \
fp->fa_fileid = txdr_unsigned(vap->va_fileid); \
fp->fa_atime.tv_sec = txdr_unsigned(vap->va_atime.tv_sec); \
fp->fa_atime.tv_usec = txdr_unsigned(vap->va_flags); \
txdr_time(&vap->va_mtime, &fp->fa_mtime); \
fp->fa_ctime.tv_sec = txdr_unsigned(vap->va_ctime.tv_sec); \
fp->fa_ctime.tv_usec = txdr_unsigned(vap->va_gen)
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.