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nfs_subs.c revision 1.1
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1989 The Regents of the University of California.
      3  1.1  cgd  * All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * This code is derived from software contributed to Berkeley by
      6  1.1  cgd  * Rick Macklem at The University of Guelph.
      7  1.1  cgd  *
      8  1.1  cgd  * Redistribution and use in source and binary forms, with or without
      9  1.1  cgd  * modification, are permitted provided that the following conditions
     10  1.1  cgd  * are met:
     11  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     12  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     13  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     14  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     15  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     16  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     17  1.1  cgd  *    must display the following acknowledgement:
     18  1.1  cgd  *	This product includes software developed by the University of
     19  1.1  cgd  *	California, Berkeley and its contributors.
     20  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     21  1.1  cgd  *    may be used to endorse or promote products derived from this software
     22  1.1  cgd  *    without specific prior written permission.
     23  1.1  cgd  *
     24  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  1.1  cgd  * SUCH DAMAGE.
     35  1.1  cgd  *
     36  1.1  cgd  *	@(#)nfs_subs.c	7.41 (Berkeley) 5/15/91
     37  1.1  cgd  */
     38  1.1  cgd 
     39  1.1  cgd /*
     40  1.1  cgd  * These functions support the macros and help fiddle mbuf chains for
     41  1.1  cgd  * the nfs op functions. They do things like create the rpc header and
     42  1.1  cgd  * copy data between mbuf chains and uio lists.
     43  1.1  cgd  */
     44  1.1  cgd #include "param.h"
     45  1.1  cgd #include "proc.h"
     46  1.1  cgd #include "filedesc.h"
     47  1.1  cgd #include "systm.h"
     48  1.1  cgd #include "kernel.h"
     49  1.1  cgd #include "mount.h"
     50  1.1  cgd #include "file.h"
     51  1.1  cgd #include "vnode.h"
     52  1.1  cgd #include "namei.h"
     53  1.1  cgd #include "mbuf.h"
     54  1.1  cgd 
     55  1.1  cgd #include "../ufs/quota.h"
     56  1.1  cgd #include "../ufs/inode.h"
     57  1.1  cgd 
     58  1.1  cgd #include "rpcv2.h"
     59  1.1  cgd #include "nfsv2.h"
     60  1.1  cgd #include "nfsnode.h"
     61  1.1  cgd #include "nfs.h"
     62  1.1  cgd #include "nfsiom.h"
     63  1.1  cgd #include "xdr_subs.h"
     64  1.1  cgd #include "nfsm_subs.h"
     65  1.1  cgd #include "nfscompress.h"
     66  1.1  cgd 
     67  1.1  cgd #define TRUE	1
     68  1.1  cgd #define	FALSE	0
     69  1.1  cgd 
     70  1.1  cgd /*
     71  1.1  cgd  * Data items converted to xdr at startup, since they are constant
     72  1.1  cgd  * This is kinda hokey, but may save a little time doing byte swaps
     73  1.1  cgd  */
     74  1.1  cgd u_long nfs_procids[NFS_NPROCS];
     75  1.1  cgd u_long nfs_xdrneg1;
     76  1.1  cgd u_long rpc_call, rpc_vers, rpc_reply, rpc_msgdenied,
     77  1.1  cgd 	rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
     78  1.1  cgd u_long nfs_vers, nfs_prog, nfs_true, nfs_false;
     79  1.1  cgd /* And other global data */
     80  1.1  cgd static u_long *rpc_uidp = (u_long *)0;
     81  1.1  cgd static u_long nfs_xid = 1;
     82  1.1  cgd static char *rpc_unixauth;
     83  1.1  cgd extern long hostid;
     84  1.1  cgd enum vtype ntov_type[7] = { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON };
     85  1.1  cgd extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
     86  1.1  cgd extern struct nfsreq nfsreqh;
     87  1.1  cgd 
     88  1.1  cgd /* Function ret types */
     89  1.1  cgd static char *nfs_unixauth();
     90  1.1  cgd 
     91  1.1  cgd /*
     92  1.1  cgd  * Maximum number of groups passed through to NFS server.
     93  1.1  cgd  * According to RFC1057 it should be 16.
     94  1.1  cgd  * For release 3.X systems, the maximum value is 8.
     95  1.1  cgd  * For some other servers, the maximum value is 10.
     96  1.1  cgd  */
     97  1.1  cgd int numgrps = 8;
     98  1.1  cgd 
     99  1.1  cgd /*
    100  1.1  cgd  * Create the header for an rpc request packet
    101  1.1  cgd  * The function nfs_unixauth() creates a unix style authorization string
    102  1.1  cgd  * and returns a ptr to it.
    103  1.1  cgd  * The hsiz is the size of the rest of the nfs request header.
    104  1.1  cgd  * (just used to decide if a cluster is a good idea)
    105  1.1  cgd  * nb: Note that the prog, vers and procid args are already in xdr byte order
    106  1.1  cgd  */
    107  1.1  cgd struct mbuf *nfsm_reqh(prog, vers, procid, cred, hsiz, bpos, mb, retxid)
    108  1.1  cgd 	u_long prog;
    109  1.1  cgd 	u_long vers;
    110  1.1  cgd 	u_long procid;
    111  1.1  cgd 	struct ucred *cred;
    112  1.1  cgd 	int hsiz;
    113  1.1  cgd 	caddr_t *bpos;
    114  1.1  cgd 	struct mbuf **mb;
    115  1.1  cgd 	u_long *retxid;
    116  1.1  cgd {
    117  1.1  cgd 	register struct mbuf *mreq, *m;
    118  1.1  cgd 	register u_long *tl;
    119  1.1  cgd 	struct mbuf *m1;
    120  1.1  cgd 	char *ap;
    121  1.1  cgd 	int asiz, siz;
    122  1.1  cgd 
    123  1.1  cgd 	NFSMGETHDR(mreq);
    124  1.1  cgd 	asiz = ((((cred->cr_ngroups - 1) > numgrps) ? numgrps :
    125  1.1  cgd 		  (cred->cr_ngroups - 1)) << 2);
    126  1.1  cgd #ifdef FILLINHOST
    127  1.1  cgd 	asiz += nfsm_rndup(hostnamelen)+(9*NFSX_UNSIGNED);
    128  1.1  cgd #else
    129  1.1  cgd 	asiz += 9*NFSX_UNSIGNED;
    130  1.1  cgd #endif
    131  1.1  cgd 
    132  1.1  cgd 	/* If we need a lot, alloc a cluster ?? */
    133  1.1  cgd 	if ((asiz+hsiz+RPC_SIZ) > MHLEN)
    134  1.1  cgd 		MCLGET(mreq, M_WAIT);
    135  1.1  cgd 	mreq->m_len = NFSMSIZ(mreq);
    136  1.1  cgd 	siz = mreq->m_len;
    137  1.1  cgd 	m1 = mreq;
    138  1.1  cgd 	/*
    139  1.1  cgd 	 * Alloc enough mbufs
    140  1.1  cgd 	 * We do it now to avoid all sleeps after the call to nfs_unixauth()
    141  1.1  cgd 	 */
    142  1.1  cgd 	while ((asiz+RPC_SIZ) > siz) {
    143  1.1  cgd 		MGET(m, M_WAIT, MT_DATA);
    144  1.1  cgd 		m1->m_next = m;
    145  1.1  cgd 		m->m_len = MLEN;
    146  1.1  cgd 		siz += MLEN;
    147  1.1  cgd 		m1 = m;
    148  1.1  cgd 	}
    149  1.1  cgd 	tl = mtod(mreq, u_long *);
    150  1.1  cgd 	*tl++ = *retxid = txdr_unsigned(++nfs_xid);
    151  1.1  cgd 	*tl++ = rpc_call;
    152  1.1  cgd 	*tl++ = rpc_vers;
    153  1.1  cgd 	*tl++ = prog;
    154  1.1  cgd 	*tl++ = vers;
    155  1.1  cgd 	*tl++ = procid;
    156  1.1  cgd 
    157  1.1  cgd 	/* Now we can call nfs_unixauth() and copy it in */
    158  1.1  cgd 	ap = nfs_unixauth(cred);
    159  1.1  cgd 	m = mreq;
    160  1.1  cgd 	siz = m->m_len-RPC_SIZ;
    161  1.1  cgd 	if (asiz <= siz) {
    162  1.1  cgd 		bcopy(ap, (caddr_t)tl, asiz);
    163  1.1  cgd 		m->m_len = asiz+RPC_SIZ;
    164  1.1  cgd 	} else {
    165  1.1  cgd 		bcopy(ap, (caddr_t)tl, siz);
    166  1.1  cgd 		ap += siz;
    167  1.1  cgd 		asiz -= siz;
    168  1.1  cgd 		while (asiz > 0) {
    169  1.1  cgd 			siz = (asiz > MLEN) ? MLEN : asiz;
    170  1.1  cgd 			m = m->m_next;
    171  1.1  cgd 			bcopy(ap, mtod(m, caddr_t), siz);
    172  1.1  cgd 			m->m_len = siz;
    173  1.1  cgd 			asiz -= siz;
    174  1.1  cgd 			ap += siz;
    175  1.1  cgd 		}
    176  1.1  cgd 	}
    177  1.1  cgd 
    178  1.1  cgd 	/* Finally, return values */
    179  1.1  cgd 	*mb = m;
    180  1.1  cgd 	*bpos = mtod(m, caddr_t)+m->m_len;
    181  1.1  cgd 	return (mreq);
    182  1.1  cgd }
    183  1.1  cgd 
    184  1.1  cgd /*
    185  1.1  cgd  * copies mbuf chain to the uio scatter/gather list
    186  1.1  cgd  */
    187  1.1  cgd nfsm_mbuftouio(mrep, uiop, siz, dpos)
    188  1.1  cgd 	struct mbuf **mrep;
    189  1.1  cgd 	register struct uio *uiop;
    190  1.1  cgd 	int siz;
    191  1.1  cgd 	caddr_t *dpos;
    192  1.1  cgd {
    193  1.1  cgd 	register char *mbufcp, *uiocp;
    194  1.1  cgd 	register int xfer, left, len;
    195  1.1  cgd 	register struct mbuf *mp;
    196  1.1  cgd 	long uiosiz, rem;
    197  1.1  cgd 	int error = 0;
    198  1.1  cgd 
    199  1.1  cgd 	mp = *mrep;
    200  1.1  cgd 	mbufcp = *dpos;
    201  1.1  cgd 	len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
    202  1.1  cgd 	rem = nfsm_rndup(siz)-siz;
    203  1.1  cgd 	while (siz > 0) {
    204  1.1  cgd 		if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
    205  1.1  cgd 			return (EFBIG);
    206  1.1  cgd 		left = uiop->uio_iov->iov_len;
    207  1.1  cgd 		uiocp = uiop->uio_iov->iov_base;
    208  1.1  cgd 		if (left > siz)
    209  1.1  cgd 			left = siz;
    210  1.1  cgd 		uiosiz = left;
    211  1.1  cgd 		while (left > 0) {
    212  1.1  cgd 			while (len == 0) {
    213  1.1  cgd 				mp = mp->m_next;
    214  1.1  cgd 				if (mp == NULL)
    215  1.1  cgd 					return (EBADRPC);
    216  1.1  cgd 				mbufcp = mtod(mp, caddr_t);
    217  1.1  cgd 				len = mp->m_len;
    218  1.1  cgd 			}
    219  1.1  cgd 			xfer = (left > len) ? len : left;
    220  1.1  cgd #ifdef notdef
    221  1.1  cgd 			/* Not Yet.. */
    222  1.1  cgd 			if (uiop->uio_iov->iov_op != NULL)
    223  1.1  cgd 				(*(uiop->uio_iov->iov_op))
    224  1.1  cgd 				(mbufcp, uiocp, xfer);
    225  1.1  cgd 			else
    226  1.1  cgd #endif
    227  1.1  cgd 			if (uiop->uio_segflg == UIO_SYSSPACE)
    228  1.1  cgd 				bcopy(mbufcp, uiocp, xfer);
    229  1.1  cgd 			else
    230  1.1  cgd 				copyout(mbufcp, uiocp, xfer);
    231  1.1  cgd 			left -= xfer;
    232  1.1  cgd 			len -= xfer;
    233  1.1  cgd 			mbufcp += xfer;
    234  1.1  cgd 			uiocp += xfer;
    235  1.1  cgd 			uiop->uio_offset += xfer;
    236  1.1  cgd 			uiop->uio_resid -= xfer;
    237  1.1  cgd 		}
    238  1.1  cgd 		if (uiop->uio_iov->iov_len <= siz) {
    239  1.1  cgd 			uiop->uio_iovcnt--;
    240  1.1  cgd 			uiop->uio_iov++;
    241  1.1  cgd 		} else {
    242  1.1  cgd 			uiop->uio_iov->iov_base += uiosiz;
    243  1.1  cgd 			uiop->uio_iov->iov_len -= uiosiz;
    244  1.1  cgd 		}
    245  1.1  cgd 		siz -= uiosiz;
    246  1.1  cgd 	}
    247  1.1  cgd 	*dpos = mbufcp;
    248  1.1  cgd 	*mrep = mp;
    249  1.1  cgd 	if (rem > 0) {
    250  1.1  cgd 		if (len < rem)
    251  1.1  cgd 			error = nfs_adv(mrep, dpos, rem, len);
    252  1.1  cgd 		else
    253  1.1  cgd 			*dpos += rem;
    254  1.1  cgd 	}
    255  1.1  cgd 	return (error);
    256  1.1  cgd }
    257  1.1  cgd 
    258  1.1  cgd /*
    259  1.1  cgd  * copies a uio scatter/gather list to an mbuf chain...
    260  1.1  cgd  */
    261  1.1  cgd nfsm_uiotombuf(uiop, mq, siz, bpos)
    262  1.1  cgd 	register struct uio *uiop;
    263  1.1  cgd 	struct mbuf **mq;
    264  1.1  cgd 	int siz;
    265  1.1  cgd 	caddr_t *bpos;
    266  1.1  cgd {
    267  1.1  cgd 	register char *uiocp;
    268  1.1  cgd 	register struct mbuf *mp, *mp2;
    269  1.1  cgd 	register int xfer, left, len;
    270  1.1  cgd 	int uiosiz, clflg, rem;
    271  1.1  cgd 	char *cp;
    272  1.1  cgd 
    273  1.1  cgd 	if (siz > MLEN)		/* or should it >= MCLBYTES ?? */
    274  1.1  cgd 		clflg = 1;
    275  1.1  cgd 	else
    276  1.1  cgd 		clflg = 0;
    277  1.1  cgd 	rem = nfsm_rndup(siz)-siz;
    278  1.1  cgd 	mp2 = *mq;
    279  1.1  cgd 	while (siz > 0) {
    280  1.1  cgd 		if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
    281  1.1  cgd 			return (EINVAL);
    282  1.1  cgd 		left = uiop->uio_iov->iov_len;
    283  1.1  cgd 		uiocp = uiop->uio_iov->iov_base;
    284  1.1  cgd 		if (left > siz)
    285  1.1  cgd 			left = siz;
    286  1.1  cgd 		uiosiz = left;
    287  1.1  cgd 		while (left > 0) {
    288  1.1  cgd 			MGET(mp, M_WAIT, MT_DATA);
    289  1.1  cgd 			if (clflg)
    290  1.1  cgd 				MCLGET(mp, M_WAIT);
    291  1.1  cgd 			mp->m_len = NFSMSIZ(mp);
    292  1.1  cgd 			mp2->m_next = mp;
    293  1.1  cgd 			mp2 = mp;
    294  1.1  cgd 			xfer = (left > mp->m_len) ? mp->m_len : left;
    295  1.1  cgd #ifdef notdef
    296  1.1  cgd 			/* Not Yet.. */
    297  1.1  cgd 			if (uiop->uio_iov->iov_op != NULL)
    298  1.1  cgd 				(*(uiop->uio_iov->iov_op))
    299  1.1  cgd 				(uiocp, mtod(mp, caddr_t), xfer);
    300  1.1  cgd 			else
    301  1.1  cgd #endif
    302  1.1  cgd 			if (uiop->uio_segflg == UIO_SYSSPACE)
    303  1.1  cgd 				bcopy(uiocp, mtod(mp, caddr_t), xfer);
    304  1.1  cgd 			else
    305  1.1  cgd 				copyin(uiocp, mtod(mp, caddr_t), xfer);
    306  1.1  cgd 			len = mp->m_len;
    307  1.1  cgd 			mp->m_len = xfer;
    308  1.1  cgd 			left -= xfer;
    309  1.1  cgd 			uiocp += xfer;
    310  1.1  cgd 			uiop->uio_offset += xfer;
    311  1.1  cgd 			uiop->uio_resid -= xfer;
    312  1.1  cgd 		}
    313  1.1  cgd 		if (uiop->uio_iov->iov_len <= siz) {
    314  1.1  cgd 			uiop->uio_iovcnt--;
    315  1.1  cgd 			uiop->uio_iov++;
    316  1.1  cgd 		} else {
    317  1.1  cgd 			uiop->uio_iov->iov_base += uiosiz;
    318  1.1  cgd 			uiop->uio_iov->iov_len -= uiosiz;
    319  1.1  cgd 		}
    320  1.1  cgd 		siz -= uiosiz;
    321  1.1  cgd 	}
    322  1.1  cgd 	if (rem > 0) {
    323  1.1  cgd 		if (rem > (len-mp->m_len)) {
    324  1.1  cgd 			MGET(mp, M_WAIT, MT_DATA);
    325  1.1  cgd 			mp->m_len = 0;
    326  1.1  cgd 			mp2->m_next = mp;
    327  1.1  cgd 		}
    328  1.1  cgd 		cp = mtod(mp, caddr_t)+mp->m_len;
    329  1.1  cgd 		for (left = 0; left < rem; left++)
    330  1.1  cgd 			*cp++ = '\0';
    331  1.1  cgd 		mp->m_len += rem;
    332  1.1  cgd 		*bpos = cp;
    333  1.1  cgd 	} else
    334  1.1  cgd 		*bpos = mtod(mp, caddr_t)+mp->m_len;
    335  1.1  cgd 	*mq = mp;
    336  1.1  cgd 	return (0);
    337  1.1  cgd }
    338  1.1  cgd 
    339  1.1  cgd /*
    340  1.1  cgd  * Help break down an mbuf chain by setting the first siz bytes contiguous
    341  1.1  cgd  * pointed to by returned val.
    342  1.1  cgd  * If Updateflg == True we can overwrite the first part of the mbuf data
    343  1.1  cgd  * This is used by the macros nfsm_disect and nfsm_disecton for tough
    344  1.1  cgd  * cases. (The macros use the vars. dpos and dpos2)
    345  1.1  cgd  */
    346  1.1  cgd nfsm_disct(mdp, dposp, siz, left, updateflg, cp2)
    347  1.1  cgd 	struct mbuf **mdp;
    348  1.1  cgd 	caddr_t *dposp;
    349  1.1  cgd 	int siz;
    350  1.1  cgd 	int left;
    351  1.1  cgd 	int updateflg;
    352  1.1  cgd 	caddr_t *cp2;
    353  1.1  cgd {
    354  1.1  cgd 	register struct mbuf *mp, *mp2;
    355  1.1  cgd 	register int siz2, xfer;
    356  1.1  cgd 	register caddr_t tl;
    357  1.1  cgd 
    358  1.1  cgd 	mp = *mdp;
    359  1.1  cgd 	while (left == 0) {
    360  1.1  cgd 		*mdp = mp = mp->m_next;
    361  1.1  cgd 		if (mp == NULL)
    362  1.1  cgd 			return (EBADRPC);
    363  1.1  cgd 		left = mp->m_len;
    364  1.1  cgd 		*dposp = mtod(mp, caddr_t);
    365  1.1  cgd 	}
    366  1.1  cgd 	if (left >= siz) {
    367  1.1  cgd 		*cp2 = *dposp;
    368  1.1  cgd 		*dposp += siz;
    369  1.1  cgd 	} else if (mp->m_next == NULL) {
    370  1.1  cgd 		return (EBADRPC);
    371  1.1  cgd 	} else if (siz > MHLEN) {
    372  1.1  cgd 		panic("nfs S too big");
    373  1.1  cgd 	} else {
    374  1.1  cgd 		/* Iff update, you can overwrite, else must alloc new mbuf */
    375  1.1  cgd 		if (updateflg) {
    376  1.1  cgd 			NFSMINOFF(mp);
    377  1.1  cgd 		} else {
    378  1.1  cgd 			MGET(mp2, M_WAIT, MT_DATA);
    379  1.1  cgd 			mp2->m_next = mp->m_next;
    380  1.1  cgd 			mp->m_next = mp2;
    381  1.1  cgd 			mp->m_len -= left;
    382  1.1  cgd 			mp = mp2;
    383  1.1  cgd 		}
    384  1.1  cgd 		*cp2 = tl = mtod(mp, caddr_t);
    385  1.1  cgd 		bcopy(*dposp, tl, left);		/* Copy what was left */
    386  1.1  cgd 		siz2 = siz-left;
    387  1.1  cgd 		tl += left;
    388  1.1  cgd 		mp2 = mp->m_next;
    389  1.1  cgd 		/* Loop around copying up the siz2 bytes */
    390  1.1  cgd 		while (siz2 > 0) {
    391  1.1  cgd 			if (mp2 == NULL)
    392  1.1  cgd 				return (EBADRPC);
    393  1.1  cgd 			xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
    394  1.1  cgd 			if (xfer > 0) {
    395  1.1  cgd 				bcopy(mtod(mp2, caddr_t), tl, xfer);
    396  1.1  cgd 				NFSMADV(mp2, xfer);
    397  1.1  cgd 				mp2->m_len -= xfer;
    398  1.1  cgd 				tl += xfer;
    399  1.1  cgd 				siz2 -= xfer;
    400  1.1  cgd 			}
    401  1.1  cgd 			if (siz2 > 0)
    402  1.1  cgd 				mp2 = mp2->m_next;
    403  1.1  cgd 		}
    404  1.1  cgd 		mp->m_len = siz;
    405  1.1  cgd 		*mdp = mp2;
    406  1.1  cgd 		*dposp = mtod(mp2, caddr_t);
    407  1.1  cgd 	}
    408  1.1  cgd 	return (0);
    409  1.1  cgd }
    410  1.1  cgd 
    411  1.1  cgd /*
    412  1.1  cgd  * Advance the position in the mbuf chain.
    413  1.1  cgd  */
    414  1.1  cgd nfs_adv(mdp, dposp, offs, left)
    415  1.1  cgd 	struct mbuf **mdp;
    416  1.1  cgd 	caddr_t *dposp;
    417  1.1  cgd 	int offs;
    418  1.1  cgd 	int left;
    419  1.1  cgd {
    420  1.1  cgd 	register struct mbuf *m;
    421  1.1  cgd 	register int s;
    422  1.1  cgd 
    423  1.1  cgd 	m = *mdp;
    424  1.1  cgd 	s = left;
    425  1.1  cgd 	while (s < offs) {
    426  1.1  cgd 		offs -= s;
    427  1.1  cgd 		m = m->m_next;
    428  1.1  cgd 		if (m == NULL)
    429  1.1  cgd 			return (EBADRPC);
    430  1.1  cgd 		s = m->m_len;
    431  1.1  cgd 	}
    432  1.1  cgd 	*mdp = m;
    433  1.1  cgd 	*dposp = mtod(m, caddr_t)+offs;
    434  1.1  cgd 	return (0);
    435  1.1  cgd }
    436  1.1  cgd 
    437  1.1  cgd /*
    438  1.1  cgd  * Copy a string into mbufs for the hard cases...
    439  1.1  cgd  */
    440  1.1  cgd nfsm_strtmbuf(mb, bpos, cp, siz)
    441  1.1  cgd 	struct mbuf **mb;
    442  1.1  cgd 	char **bpos;
    443  1.1  cgd 	char *cp;
    444  1.1  cgd 	long siz;
    445  1.1  cgd {
    446  1.1  cgd 	register struct mbuf *m1, *m2;
    447  1.1  cgd 	long left, xfer, len, tlen;
    448  1.1  cgd 	u_long *tl;
    449  1.1  cgd 	int putsize;
    450  1.1  cgd 
    451  1.1  cgd 	putsize = 1;
    452  1.1  cgd 	m2 = *mb;
    453  1.1  cgd 	left = NFSMSIZ(m2)-m2->m_len;
    454  1.1  cgd 	if (left > 0) {
    455  1.1  cgd 		tl = ((u_long *)(*bpos));
    456  1.1  cgd 		*tl++ = txdr_unsigned(siz);
    457  1.1  cgd 		putsize = 0;
    458  1.1  cgd 		left -= NFSX_UNSIGNED;
    459  1.1  cgd 		m2->m_len += NFSX_UNSIGNED;
    460  1.1  cgd 		if (left > 0) {
    461  1.1  cgd 			bcopy(cp, (caddr_t) tl, left);
    462  1.1  cgd 			siz -= left;
    463  1.1  cgd 			cp += left;
    464  1.1  cgd 			m2->m_len += left;
    465  1.1  cgd 			left = 0;
    466  1.1  cgd 		}
    467  1.1  cgd 	}
    468  1.1  cgd 	/* Loop arround adding mbufs */
    469  1.1  cgd 	while (siz > 0) {
    470  1.1  cgd 		MGET(m1, M_WAIT, MT_DATA);
    471  1.1  cgd 		if (siz > MLEN)
    472  1.1  cgd 			MCLGET(m1, M_WAIT);
    473  1.1  cgd 		m1->m_len = NFSMSIZ(m1);
    474  1.1  cgd 		m2->m_next = m1;
    475  1.1  cgd 		m2 = m1;
    476  1.1  cgd 		tl = mtod(m1, u_long *);
    477  1.1  cgd 		tlen = 0;
    478  1.1  cgd 		if (putsize) {
    479  1.1  cgd 			*tl++ = txdr_unsigned(siz);
    480  1.1  cgd 			m1->m_len -= NFSX_UNSIGNED;
    481  1.1  cgd 			tlen = NFSX_UNSIGNED;
    482  1.1  cgd 			putsize = 0;
    483  1.1  cgd 		}
    484  1.1  cgd 		if (siz < m1->m_len) {
    485  1.1  cgd 			len = nfsm_rndup(siz);
    486  1.1  cgd 			xfer = siz;
    487  1.1  cgd 			if (xfer < len)
    488  1.1  cgd 				*(tl+(xfer>>2)) = 0;
    489  1.1  cgd 		} else {
    490  1.1  cgd 			xfer = len = m1->m_len;
    491  1.1  cgd 		}
    492  1.1  cgd 		bcopy(cp, (caddr_t) tl, xfer);
    493  1.1  cgd 		m1->m_len = len+tlen;
    494  1.1  cgd 		siz -= xfer;
    495  1.1  cgd 		cp += xfer;
    496  1.1  cgd 	}
    497  1.1  cgd 	*mb = m1;
    498  1.1  cgd 	*bpos = mtod(m1, caddr_t)+m1->m_len;
    499  1.1  cgd 	return (0);
    500  1.1  cgd }
    501  1.1  cgd 
    502  1.1  cgd /*
    503  1.1  cgd  * Called once to initialize data structures...
    504  1.1  cgd  */
    505  1.1  cgd nfs_init()
    506  1.1  cgd {
    507  1.1  cgd 	register int i;
    508  1.1  cgd 
    509  1.1  cgd 	rpc_vers = txdr_unsigned(RPC_VER2);
    510  1.1  cgd 	rpc_call = txdr_unsigned(RPC_CALL);
    511  1.1  cgd 	rpc_reply = txdr_unsigned(RPC_REPLY);
    512  1.1  cgd 	rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
    513  1.1  cgd 	rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
    514  1.1  cgd 	rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
    515  1.1  cgd 	rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
    516  1.1  cgd 	nfs_vers = txdr_unsigned(NFS_VER2);
    517  1.1  cgd 	nfs_prog = txdr_unsigned(NFS_PROG);
    518  1.1  cgd 	nfs_true = txdr_unsigned(TRUE);
    519  1.1  cgd 	nfs_false = txdr_unsigned(FALSE);
    520  1.1  cgd 	/* Loop thru nfs procids */
    521  1.1  cgd 	for (i = 0; i < NFS_NPROCS; i++)
    522  1.1  cgd 		nfs_procids[i] = txdr_unsigned(i);
    523  1.1  cgd 	/* Ensure async daemons disabled */
    524  1.1  cgd 	for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
    525  1.1  cgd 		nfs_iodwant[i] = (struct proc *)0;
    526  1.1  cgd 	nfs_xdrneg1 = txdr_unsigned(-1);
    527  1.1  cgd 	nfs_nhinit();			/* Init the nfsnode table */
    528  1.1  cgd 	nfsrv_initcache();		/* Init the server request cache */
    529  1.1  cgd 
    530  1.1  cgd 	/*
    531  1.1  cgd 	 * Initialize reply list and start timer
    532  1.1  cgd 	 */
    533  1.1  cgd 	nfsreqh.r_prev = nfsreqh.r_next = &nfsreqh;
    534  1.1  cgd 	nfs_timer();
    535  1.1  cgd }
    536  1.1  cgd 
    537  1.1  cgd /*
    538  1.1  cgd  * Fill in the rest of the rpc_unixauth and return it
    539  1.1  cgd  */
    540  1.1  cgd static char *nfs_unixauth(cr)
    541  1.1  cgd 	register struct ucred *cr;
    542  1.1  cgd {
    543  1.1  cgd 	register u_long *tl;
    544  1.1  cgd 	register int i;
    545  1.1  cgd 	int ngr;
    546  1.1  cgd 
    547  1.1  cgd 	/* Maybe someday there should be a cache of AUTH_SHORT's */
    548  1.1  cgd 	if ((tl = rpc_uidp) == NULL) {
    549  1.1  cgd #ifdef FILLINHOST
    550  1.1  cgd 		i = nfsm_rndup(hostnamelen)+(25*NFSX_UNSIGNED);
    551  1.1  cgd #else
    552  1.1  cgd 		i = 25*NFSX_UNSIGNED;
    553  1.1  cgd #endif
    554  1.1  cgd 		MALLOC(tl, u_long *, i, M_TEMP, M_WAITOK);
    555  1.1  cgd 		bzero((caddr_t)tl, i);
    556  1.1  cgd 		rpc_unixauth = (caddr_t)tl;
    557  1.1  cgd 		*tl++ = txdr_unsigned(RPCAUTH_UNIX);
    558  1.1  cgd 		tl++;	/* Fill in size later */
    559  1.1  cgd 		*tl++ = hostid;
    560  1.1  cgd #ifdef FILLINHOST
    561  1.1  cgd 		*tl++ = txdr_unsigned(hostnamelen);
    562  1.1  cgd 		i = nfsm_rndup(hostnamelen);
    563  1.1  cgd 		bcopy(hostname, (caddr_t)tl, hostnamelen);
    564  1.1  cgd 		tl += (i>>2);
    565  1.1  cgd #else
    566  1.1  cgd 		*tl++ = 0;
    567  1.1  cgd #endif
    568  1.1  cgd 		rpc_uidp = tl;
    569  1.1  cgd 	}
    570  1.1  cgd 	*tl++ = txdr_unsigned(cr->cr_uid);
    571  1.1  cgd 	*tl++ = txdr_unsigned(cr->cr_groups[0]);
    572  1.1  cgd 	ngr = ((cr->cr_ngroups - 1) > numgrps) ? numgrps : (cr->cr_ngroups - 1);
    573  1.1  cgd 	*tl++ = txdr_unsigned(ngr);
    574  1.1  cgd 	for (i = 1; i <= ngr; i++)
    575  1.1  cgd 		*tl++ = txdr_unsigned(cr->cr_groups[i]);
    576  1.1  cgd 	/* And add the AUTH_NULL */
    577  1.1  cgd 	*tl++ = 0;
    578  1.1  cgd 	*tl = 0;
    579  1.1  cgd 	i = (((caddr_t)tl)-rpc_unixauth)-12;
    580  1.1  cgd 	tl = (u_long *)(rpc_unixauth+4);
    581  1.1  cgd 	*tl = txdr_unsigned(i);
    582  1.1  cgd 	return (rpc_unixauth);
    583  1.1  cgd }
    584  1.1  cgd 
    585  1.1  cgd /*
    586  1.1  cgd  * Attribute cache routines.
    587  1.1  cgd  * nfs_loadattrcache() - loads or updates the cache contents from attributes
    588  1.1  cgd  *	that are on the mbuf list
    589  1.1  cgd  * nfs_getattrcache() - returns valid attributes if found in cache, returns
    590  1.1  cgd  *	error otherwise
    591  1.1  cgd  */
    592  1.1  cgd 
    593  1.1  cgd /*
    594  1.1  cgd  * Load the attribute cache (that lives in the nfsnode entry) with
    595  1.1  cgd  * the values on the mbuf list and
    596  1.1  cgd  * Iff vap not NULL
    597  1.1  cgd  *    copy the attributes to *vaper
    598  1.1  cgd  */
    599  1.1  cgd nfs_loadattrcache(vpp, mdp, dposp, vaper)
    600  1.1  cgd 	struct vnode **vpp;
    601  1.1  cgd 	struct mbuf **mdp;
    602  1.1  cgd 	caddr_t *dposp;
    603  1.1  cgd 	struct vattr *vaper;
    604  1.1  cgd {
    605  1.1  cgd 	register struct vnode *vp = *vpp;
    606  1.1  cgd 	register struct vattr *vap;
    607  1.1  cgd 	register struct nfsv2_fattr *fp;
    608  1.1  cgd 	extern struct vnodeops spec_nfsv2nodeops;
    609  1.1  cgd 	register struct nfsnode *np;
    610  1.1  cgd 	register long t1;
    611  1.1  cgd 	caddr_t dpos, cp2;
    612  1.1  cgd 	int error = 0;
    613  1.1  cgd 	struct mbuf *md;
    614  1.1  cgd 	enum vtype type;
    615  1.1  cgd 	u_short mode;
    616  1.1  cgd 	long rdev;
    617  1.1  cgd 	struct timeval mtime;
    618  1.1  cgd 	struct vnode *nvp;
    619  1.1  cgd 
    620  1.1  cgd 	md = *mdp;
    621  1.1  cgd 	dpos = *dposp;
    622  1.1  cgd 	t1 = (mtod(md, caddr_t)+md->m_len)-dpos;
    623  1.1  cgd 	if (error = nfsm_disct(&md, &dpos, NFSX_FATTR, t1, TRUE, &cp2))
    624  1.1  cgd 		return (error);
    625  1.1  cgd 	fp = (struct nfsv2_fattr *)cp2;
    626  1.1  cgd 	type = nfstov_type(fp->fa_type);
    627  1.1  cgd 	mode = fxdr_unsigned(u_short, fp->fa_mode);
    628  1.1  cgd 	if (type == VNON)
    629  1.1  cgd 		type = IFTOVT(mode);
    630  1.1  cgd 	rdev = fxdr_unsigned(long, fp->fa_rdev);
    631  1.1  cgd 	fxdr_time(&fp->fa_mtime, &mtime);
    632  1.1  cgd 	/*
    633  1.1  cgd 	 * If v_type == VNON it is a new node, so fill in the v_type,
    634  1.1  cgd 	 * n_mtime fields. Check to see if it represents a special
    635  1.1  cgd 	 * device, and if so, check for a possible alias. Once the
    636  1.1  cgd 	 * correct vnode has been obtained, fill in the rest of the
    637  1.1  cgd 	 * information.
    638  1.1  cgd 	 */
    639  1.1  cgd 	np = VTONFS(vp);
    640  1.1  cgd 	if (vp->v_type == VNON) {
    641  1.1  cgd 		if (type == VCHR && rdev == 0xffffffff)
    642  1.1  cgd 			vp->v_type = type = VFIFO;
    643  1.1  cgd 		else
    644  1.1  cgd 			vp->v_type = type;
    645  1.1  cgd 		if (vp->v_type == VFIFO) {
    646  1.1  cgd #ifdef FIFO
    647  1.1  cgd 			extern struct vnodeops fifo_nfsv2nodeops;
    648  1.1  cgd 			vp->v_op = &fifo_nfsv2nodeops;
    649  1.1  cgd #else
    650  1.1  cgd 			return (EOPNOTSUPP);
    651  1.1  cgd #endif /* FIFO */
    652  1.1  cgd 		}
    653  1.1  cgd 		if (vp->v_type == VCHR || vp->v_type == VBLK) {
    654  1.1  cgd 			vp->v_op = &spec_nfsv2nodeops;
    655  1.1  cgd 			if (nvp = checkalias(vp, (dev_t)rdev, vp->v_mount)) {
    656  1.1  cgd 				/*
    657  1.1  cgd 				 * Reinitialize aliased node.
    658  1.1  cgd 				 */
    659  1.1  cgd 				np = VTONFS(nvp);
    660  1.1  cgd 				np->n_vnode = nvp;
    661  1.1  cgd 				np->n_flag = 0;
    662  1.1  cgd 				nfs_lock(nvp);
    663  1.1  cgd 				bcopy((caddr_t)&VTONFS(vp)->n_fh,
    664  1.1  cgd 					(caddr_t)&np->n_fh, NFSX_FH);
    665  1.1  cgd 				insque(np, nfs_hash(&np->n_fh));
    666  1.1  cgd 				np->n_attrstamp = 0;
    667  1.1  cgd 				np->n_sillyrename = (struct sillyrename *)0;
    668  1.1  cgd 				/*
    669  1.1  cgd 				 * Discard unneeded vnode and update actual one
    670  1.1  cgd 				 */
    671  1.1  cgd 				vput(vp);
    672  1.1  cgd 				*vpp = nvp;
    673  1.1  cgd 			}
    674  1.1  cgd 		}
    675  1.1  cgd 		np->n_mtime = mtime.tv_sec;
    676  1.1  cgd 	}
    677  1.1  cgd 	vap = &np->n_vattr;
    678  1.1  cgd 	vap->va_type = type;
    679  1.1  cgd 	vap->va_mode = (mode & 07777);
    680  1.1  cgd 	vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
    681  1.1  cgd 	vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
    682  1.1  cgd 	vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
    683  1.1  cgd 	vap->va_size = fxdr_unsigned(u_long, fp->fa_size);
    684  1.1  cgd 	if ((np->n_flag & NMODIFIED) == 0 || vap->va_size > np->n_size) {
    685  1.1  cgd 		np->n_size = vap->va_size;
    686  1.1  cgd 		vnode_pager_setsize(vp, np->n_size);
    687  1.1  cgd 	}
    688  1.1  cgd 	vap->va_size_rsv = 0;
    689  1.1  cgd 	vap->va_blocksize = fxdr_unsigned(long, fp->fa_blocksize);
    690  1.1  cgd 	vap->va_rdev = (dev_t)rdev;
    691  1.1  cgd 	vap->va_bytes = fxdr_unsigned(long, fp->fa_blocks) * NFS_FABLKSIZE;
    692  1.1  cgd 	vap->va_bytes_rsv = 0;
    693  1.1  cgd 	vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
    694  1.1  cgd 	vap->va_fileid = fxdr_unsigned(long, fp->fa_fileid);
    695  1.1  cgd 	vap->va_atime.tv_sec = fxdr_unsigned(long, fp->fa_atime.tv_sec);
    696  1.1  cgd 	vap->va_atime.tv_usec = 0;
    697  1.1  cgd 	vap->va_flags = fxdr_unsigned(u_long, fp->fa_atime.tv_usec);
    698  1.1  cgd 	vap->va_mtime = mtime;
    699  1.1  cgd 	vap->va_ctime.tv_sec = fxdr_unsigned(long, fp->fa_ctime.tv_sec);
    700  1.1  cgd 	vap->va_ctime.tv_usec = 0;
    701  1.1  cgd 	vap->va_gen = fxdr_unsigned(u_long, fp->fa_ctime.tv_usec);
    702  1.1  cgd 	np->n_attrstamp = time.tv_sec;
    703  1.1  cgd 	*dposp = dpos;
    704  1.1  cgd 	*mdp = md;
    705  1.1  cgd 	if (vaper != NULL) {
    706  1.1  cgd 		bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
    707  1.1  cgd 		if ((np->n_flag & NMODIFIED) && (np->n_size > vap->va_size))
    708  1.1  cgd 			vaper->va_size = np->n_size;
    709  1.1  cgd 	}
    710  1.1  cgd 	return (0);
    711  1.1  cgd }
    712  1.1  cgd 
    713  1.1  cgd /*
    714  1.1  cgd  * Check the time stamp
    715  1.1  cgd  * If the cache is valid, copy contents to *vap and return 0
    716  1.1  cgd  * otherwise return an error
    717  1.1  cgd  */
    718  1.1  cgd nfs_getattrcache(vp, vap)
    719  1.1  cgd 	register struct vnode *vp;
    720  1.1  cgd 	struct vattr *vap;
    721  1.1  cgd {
    722  1.1  cgd 	register struct nfsnode *np;
    723  1.1  cgd 
    724  1.1  cgd 	np = VTONFS(vp);
    725  1.1  cgd 	if ((time.tv_sec-np->n_attrstamp) < NFS_ATTRTIMEO) {
    726  1.1  cgd 		nfsstats.attrcache_hits++;
    727  1.1  cgd 		bcopy((caddr_t)&np->n_vattr,(caddr_t)vap,sizeof(struct vattr));
    728  1.1  cgd 		if ((np->n_flag & NMODIFIED) == 0) {
    729  1.1  cgd 			np->n_size = vap->va_size;
    730  1.1  cgd 			vnode_pager_setsize(vp, np->n_size);
    731  1.1  cgd 		} else if (np->n_size > vap->va_size)
    732  1.1  cgd 			vap->va_size = np->n_size;
    733  1.1  cgd 		return (0);
    734  1.1  cgd 	} else {
    735  1.1  cgd 		nfsstats.attrcache_misses++;
    736  1.1  cgd 		return (ENOENT);
    737  1.1  cgd 	}
    738  1.1  cgd }
    739  1.1  cgd 
    740  1.1  cgd /*
    741  1.1  cgd  * Set up nameidata for a namei() call and do it
    742  1.1  cgd  */
    743  1.1  cgd nfs_namei(ndp, fhp, len, mdp, dposp, p)
    744  1.1  cgd 	register struct nameidata *ndp;
    745  1.1  cgd 	fhandle_t *fhp;
    746  1.1  cgd 	int len;
    747  1.1  cgd 	struct mbuf **mdp;
    748  1.1  cgd 	caddr_t *dposp;
    749  1.1  cgd 	struct proc *p;
    750  1.1  cgd {
    751  1.1  cgd 	register int i, rem;
    752  1.1  cgd 	register struct mbuf *md;
    753  1.1  cgd 	register char *fromcp, *tocp;
    754  1.1  cgd 	struct vnode *dp;
    755  1.1  cgd 	int flag;
    756  1.1  cgd 	int error;
    757  1.1  cgd 
    758  1.1  cgd 	flag = ndp->ni_nameiop & OPMASK;
    759  1.1  cgd 	MALLOC(ndp->ni_pnbuf, char *, len + 1, M_NAMEI, M_WAITOK);
    760  1.1  cgd 	/*
    761  1.1  cgd 	 * Copy the name from the mbuf list to ndp->ni_pnbuf
    762  1.1  cgd 	 * and set the various ndp fields appropriately.
    763  1.1  cgd 	 */
    764  1.1  cgd 	fromcp = *dposp;
    765  1.1  cgd 	tocp = ndp->ni_pnbuf;
    766  1.1  cgd 	md = *mdp;
    767  1.1  cgd 	rem = mtod(md, caddr_t) + md->m_len - fromcp;
    768  1.1  cgd 	ndp->ni_hash = 0;
    769  1.1  cgd 	for (i = 0; i < len; i++) {
    770  1.1  cgd 		while (rem == 0) {
    771  1.1  cgd 			md = md->m_next;
    772  1.1  cgd 			if (md == NULL) {
    773  1.1  cgd 				error = EBADRPC;
    774  1.1  cgd 				goto out;
    775  1.1  cgd 			}
    776  1.1  cgd 			fromcp = mtod(md, caddr_t);
    777  1.1  cgd 			rem = md->m_len;
    778  1.1  cgd 		}
    779  1.1  cgd 		if (*fromcp == '\0' || *fromcp == '/') {
    780  1.1  cgd 			error = EINVAL;
    781  1.1  cgd 			goto out;
    782  1.1  cgd 		}
    783  1.1  cgd 		if (*fromcp & 0200)
    784  1.1  cgd 			if ((*fromcp&0377) == ('/'|0200) || flag != DELETE) {
    785  1.1  cgd 				error = EINVAL;
    786  1.1  cgd 				goto out;
    787  1.1  cgd 			}
    788  1.1  cgd 		ndp->ni_hash += (unsigned char)*fromcp;
    789  1.1  cgd 		*tocp++ = *fromcp++;
    790  1.1  cgd 		rem--;
    791  1.1  cgd 	}
    792  1.1  cgd 	*tocp = '\0';
    793  1.1  cgd 	*mdp = md;
    794  1.1  cgd 	*dposp = fromcp;
    795  1.1  cgd 	len = nfsm_rndup(len)-len;
    796  1.1  cgd 	if (len > 0) {
    797  1.1  cgd 		if (rem >= len)
    798  1.1  cgd 			*dposp += len;
    799  1.1  cgd 		else if (error = nfs_adv(mdp, dposp, len, rem))
    800  1.1  cgd 			goto out;
    801  1.1  cgd 	}
    802  1.1  cgd 	ndp->ni_pathlen = tocp - ndp->ni_pnbuf;
    803  1.1  cgd 	ndp->ni_ptr = ndp->ni_pnbuf;
    804  1.1  cgd 	/*
    805  1.1  cgd 	 * Extract and set starting directory.
    806  1.1  cgd 	 */
    807  1.1  cgd 	if (error = nfsrv_fhtovp(fhp, FALSE, &dp, ndp->ni_cred))
    808  1.1  cgd 		goto out;
    809  1.1  cgd 	if (dp->v_type != VDIR) {
    810  1.1  cgd 		vrele(dp);
    811  1.1  cgd 		error = ENOTDIR;
    812  1.1  cgd 		goto out;
    813  1.1  cgd 	}
    814  1.1  cgd 	ndp->ni_startdir = dp;
    815  1.1  cgd 	ndp->ni_nameiop |= (NOCROSSMOUNT | REMOTE);
    816  1.1  cgd 	/*
    817  1.1  cgd 	 * And call lookup() to do the real work
    818  1.1  cgd 	 */
    819  1.1  cgd 	if (error = lookup(ndp, p))
    820  1.1  cgd 		goto out;
    821  1.1  cgd 	/*
    822  1.1  cgd 	 * Check for encountering a symbolic link
    823  1.1  cgd 	 */
    824  1.1  cgd 	if (ndp->ni_more) {
    825  1.1  cgd 		if ((ndp->ni_nameiop & LOCKPARENT) && ndp->ni_pathlen == 1)
    826  1.1  cgd 			vput(ndp->ni_dvp);
    827  1.1  cgd 		else
    828  1.1  cgd 			vrele(ndp->ni_dvp);
    829  1.1  cgd 		vput(ndp->ni_vp);
    830  1.1  cgd 		ndp->ni_vp = NULL;
    831  1.1  cgd 		error = EINVAL;
    832  1.1  cgd 		goto out;
    833  1.1  cgd 	}
    834  1.1  cgd 	/*
    835  1.1  cgd 	 * Check for saved name request
    836  1.1  cgd 	 */
    837  1.1  cgd 	if (ndp->ni_nameiop & (SAVENAME | SAVESTART)) {
    838  1.1  cgd 		ndp->ni_nameiop |= HASBUF;
    839  1.1  cgd 		return (0);
    840  1.1  cgd 	}
    841  1.1  cgd out:
    842  1.1  cgd 	FREE(ndp->ni_pnbuf, M_NAMEI);
    843  1.1  cgd 	return (error);
    844  1.1  cgd }
    845  1.1  cgd 
    846  1.1  cgd /*
    847  1.1  cgd  * A fiddled version of m_adj() that ensures null fill to a long
    848  1.1  cgd  * boundary and only trims off the back end
    849  1.1  cgd  */
    850  1.1  cgd nfsm_adj(mp, len, nul)
    851  1.1  cgd 	struct mbuf *mp;
    852  1.1  cgd 	register int len;
    853  1.1  cgd 	int nul;
    854  1.1  cgd {
    855  1.1  cgd 	register struct mbuf *m;
    856  1.1  cgd 	register int count, i;
    857  1.1  cgd 	register char *cp;
    858  1.1  cgd 
    859  1.1  cgd 	/*
    860  1.1  cgd 	 * Trim from tail.  Scan the mbuf chain,
    861  1.1  cgd 	 * calculating its length and finding the last mbuf.
    862  1.1  cgd 	 * If the adjustment only affects this mbuf, then just
    863  1.1  cgd 	 * adjust and return.  Otherwise, rescan and truncate
    864  1.1  cgd 	 * after the remaining size.
    865  1.1  cgd 	 */
    866  1.1  cgd 	count = 0;
    867  1.1  cgd 	m = mp;
    868  1.1  cgd 	for (;;) {
    869  1.1  cgd 		count += m->m_len;
    870  1.1  cgd 		if (m->m_next == (struct mbuf *)0)
    871  1.1  cgd 			break;
    872  1.1  cgd 		m = m->m_next;
    873  1.1  cgd 	}
    874  1.1  cgd 	if (m->m_len > len) {
    875  1.1  cgd 		m->m_len -= len;
    876  1.1  cgd 		if (nul > 0) {
    877  1.1  cgd 			cp = mtod(m, caddr_t)+m->m_len-nul;
    878  1.1  cgd 			for (i = 0; i < nul; i++)
    879  1.1  cgd 				*cp++ = '\0';
    880  1.1  cgd 		}
    881  1.1  cgd 		return;
    882  1.1  cgd 	}
    883  1.1  cgd 	count -= len;
    884  1.1  cgd 	if (count < 0)
    885  1.1  cgd 		count = 0;
    886  1.1  cgd 	/*
    887  1.1  cgd 	 * Correct length for chain is "count".
    888  1.1  cgd 	 * Find the mbuf with last data, adjust its length,
    889  1.1  cgd 	 * and toss data from remaining mbufs on chain.
    890  1.1  cgd 	 */
    891  1.1  cgd 	for (m = mp; m; m = m->m_next) {
    892  1.1  cgd 		if (m->m_len >= count) {
    893  1.1  cgd 			m->m_len = count;
    894  1.1  cgd 			if (nul > 0) {
    895  1.1  cgd 				cp = mtod(m, caddr_t)+m->m_len-nul;
    896  1.1  cgd 				for (i = 0; i < nul; i++)
    897  1.1  cgd 					*cp++ = '\0';
    898  1.1  cgd 			}
    899  1.1  cgd 			break;
    900  1.1  cgd 		}
    901  1.1  cgd 		count -= m->m_len;
    902  1.1  cgd 	}
    903  1.1  cgd 	while (m = m->m_next)
    904  1.1  cgd 		m->m_len = 0;
    905  1.1  cgd }
    906  1.1  cgd 
    907  1.1  cgd /*
    908  1.1  cgd  * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
    909  1.1  cgd  * 	- look up fsid in mount list (if not found ret error)
    910  1.1  cgd  *	- check that it is exported
    911  1.1  cgd  *	- get vp by calling VFS_FHTOVP() macro
    912  1.1  cgd  *	- if not lockflag unlock it with VOP_UNLOCK()
    913  1.1  cgd  *	- if cred->cr_uid == 0 set it to m_exroot
    914  1.1  cgd  */
    915  1.1  cgd nfsrv_fhtovp(fhp, lockflag, vpp, cred)
    916  1.1  cgd 	fhandle_t *fhp;
    917  1.1  cgd 	int lockflag;
    918  1.1  cgd 	struct vnode **vpp;
    919  1.1  cgd 	struct ucred *cred;
    920  1.1  cgd {
    921  1.1  cgd 	register struct mount *mp;
    922  1.1  cgd 
    923  1.1  cgd 	if ((mp = getvfs(&fhp->fh_fsid)) == NULL)
    924  1.1  cgd 		return (ESTALE);
    925  1.1  cgd 	if ((mp->mnt_flag & MNT_EXPORTED) == 0)
    926  1.1  cgd 		return (EACCES);
    927  1.1  cgd 	if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp))
    928  1.1  cgd 		return (ESTALE);
    929  1.1  cgd 	if (cred->cr_uid == 0)
    930  1.1  cgd 		cred->cr_uid = mp->mnt_exroot;
    931  1.1  cgd 	if (!lockflag)
    932  1.1  cgd 		VOP_UNLOCK(*vpp);
    933  1.1  cgd 	return (0);
    934  1.1  cgd }
    935  1.1  cgd 
    936  1.1  cgd /*
    937  1.1  cgd  * These two functions implement nfs rpc compression.
    938  1.1  cgd  * The algorithm is a trivial run length encoding of '\0' bytes. The high
    939  1.1  cgd  * order nibble of hex "e" is or'd with the number of zeroes - 2 in four
    940  1.1  cgd  * bits. (2 - 17 zeros) Any data byte with a high order nibble of hex "e"
    941  1.1  cgd  * is byte stuffed.
    942  1.1  cgd  * The compressed data is padded with 0x0 bytes to an even multiple of
    943  1.1  cgd  * 4 bytes in length to avoid any weird long pointer alignments.
    944  1.1  cgd  * If compression/uncompression is unsuccessful, the original mbuf list
    945  1.1  cgd  * is returned.
    946  1.1  cgd  * The first four bytes (the XID) are left uncompressed and the fifth
    947  1.1  cgd  * byte is set to 0x1 for request and 0x2 for reply.
    948  1.1  cgd  * An uncompressed RPC will always have the fifth byte == 0x0.
    949  1.1  cgd  */
    950  1.1  cgd struct mbuf *
    951  1.1  cgd nfs_compress(m0)
    952  1.1  cgd 	struct mbuf *m0;
    953  1.1  cgd {
    954  1.1  cgd 	register u_char ch, nextch;
    955  1.1  cgd 	register int i, rlelast;
    956  1.1  cgd 	register u_char *ip, *op;
    957  1.1  cgd 	register int ileft, oleft, noteof;
    958  1.1  cgd 	register struct mbuf *m, *om;
    959  1.1  cgd 	struct mbuf **mp, *retm;
    960  1.1  cgd 	int olen, clget;
    961  1.1  cgd 
    962  1.1  cgd 	i = rlelast = 0;
    963  1.1  cgd 	noteof = 1;
    964  1.1  cgd 	m = m0;
    965  1.1  cgd 	if (m->m_len < 12)
    966  1.1  cgd 		return (m0);
    967  1.1  cgd 	if (m->m_pkthdr.len >= MINCLSIZE)
    968  1.1  cgd 		clget = 1;
    969  1.1  cgd 	else
    970  1.1  cgd 		clget = 0;
    971  1.1  cgd 	ileft = m->m_len - 9;
    972  1.1  cgd 	ip = mtod(m, u_char *);
    973  1.1  cgd 	MGETHDR(om, M_WAIT, MT_DATA);
    974  1.1  cgd 	if (clget)
    975  1.1  cgd 		MCLGET(om, M_WAIT);
    976  1.1  cgd 	retm = om;
    977  1.1  cgd 	mp = &om->m_next;
    978  1.1  cgd 	olen = om->m_len = 5;
    979  1.1  cgd 	oleft = M_TRAILINGSPACE(om);
    980  1.1  cgd 	op = mtod(om, u_char *);
    981  1.1  cgd 	*((u_long *)op) = *((u_long *)ip);
    982  1.1  cgd 	ip += 7;
    983  1.1  cgd 	op += 4;
    984  1.1  cgd 	*op++ = *ip++ + 1;
    985  1.1  cgd 	nextch = *ip++;
    986  1.1  cgd 	while (noteof) {
    987  1.1  cgd 		ch = nextch;
    988  1.1  cgd 		if (ileft == 0) {
    989  1.1  cgd 			do {
    990  1.1  cgd 				m = m->m_next;
    991  1.1  cgd 			} while (m && m->m_len == 0);
    992  1.1  cgd 			if (m) {
    993  1.1  cgd 				ileft = m->m_len;
    994  1.1  cgd 				ip = mtod(m, u_char *);
    995  1.1  cgd 			} else {
    996  1.1  cgd 				noteof = 0;
    997  1.1  cgd 				nextch = 0x1;
    998  1.1  cgd 				goto doit;
    999  1.1  cgd 			}
   1000  1.1  cgd 		}
   1001  1.1  cgd 		nextch = *ip++;
   1002  1.1  cgd 		ileft--;
   1003  1.1  cgd doit:
   1004  1.1  cgd 		if (ch == '\0') {
   1005  1.1  cgd 			if (++i == NFSC_MAX || nextch != '\0') {
   1006  1.1  cgd 				if (i < 2) {
   1007  1.1  cgd 					nfscput('\0');
   1008  1.1  cgd 				} else {
   1009  1.1  cgd 					if (rlelast == i) {
   1010  1.1  cgd 						nfscput('\0');
   1011  1.1  cgd 						i--;
   1012  1.1  cgd 					}
   1013  1.1  cgd 					if (NFSCRLE(i) == (nextch & 0xff)) {
   1014  1.1  cgd 						i--;
   1015  1.1  cgd 						if (i < 2) {
   1016  1.1  cgd 							nfscput('\0');
   1017  1.1  cgd 						} else {
   1018  1.1  cgd 							nfscput(NFSCRLE(i));
   1019  1.1  cgd 						}
   1020  1.1  cgd 						nfscput('\0');
   1021  1.1  cgd 						rlelast = 0;
   1022  1.1  cgd 					} else {
   1023  1.1  cgd 						nfscput(NFSCRLE(i));
   1024  1.1  cgd 						rlelast = i;
   1025  1.1  cgd 					}
   1026  1.1  cgd 				}
   1027  1.1  cgd 				i = 0;
   1028  1.1  cgd 			}
   1029  1.1  cgd 		} else {
   1030  1.1  cgd 			if ((ch & NFSCRL) == NFSCRL) {
   1031  1.1  cgd 				nfscput(ch);
   1032  1.1  cgd 			}
   1033  1.1  cgd 			nfscput(ch);
   1034  1.1  cgd 			i = rlelast = 0;
   1035  1.1  cgd 		}
   1036  1.1  cgd 	}
   1037  1.1  cgd 	if (olen < m0->m_pkthdr.len) {
   1038  1.1  cgd 		m_freem(m0);
   1039  1.1  cgd 		if (i = (olen & 0x3)) {
   1040  1.1  cgd 			i = 4 - i;
   1041  1.1  cgd 			while (i-- > 0) {
   1042  1.1  cgd 				nfscput('\0');
   1043  1.1  cgd 			}
   1044  1.1  cgd 		}
   1045  1.1  cgd 		retm->m_pkthdr.len = olen;
   1046  1.1  cgd 		retm->m_pkthdr.rcvif = (struct ifnet *)0;
   1047  1.1  cgd 		return (retm);
   1048  1.1  cgd 	} else {
   1049  1.1  cgd 		m_freem(retm);
   1050  1.1  cgd 		return (m0);
   1051  1.1  cgd 	}
   1052  1.1  cgd }
   1053  1.1  cgd 
   1054  1.1  cgd struct mbuf *
   1055  1.1  cgd nfs_uncompress(m0)
   1056  1.1  cgd 	struct mbuf *m0;
   1057  1.1  cgd {
   1058  1.1  cgd 	register u_char cp, nextcp, *ip, *op;
   1059  1.1  cgd 	register struct mbuf *m, *om;
   1060  1.1  cgd 	struct mbuf *retm, **mp;
   1061  1.1  cgd 	int i, j, noteof, clget, ileft, oleft, olen;
   1062  1.1  cgd 
   1063  1.1  cgd 	m = m0;
   1064  1.1  cgd 	i = 0;
   1065  1.1  cgd 	while (m && i < MINCLSIZE) {
   1066  1.1  cgd 		i += m->m_len;
   1067  1.1  cgd 		m = m->m_next;
   1068  1.1  cgd 	}
   1069  1.1  cgd 	if (i < 6)
   1070  1.1  cgd 		return (m0);
   1071  1.1  cgd 	if (i >= MINCLSIZE)
   1072  1.1  cgd 		clget = 1;
   1073  1.1  cgd 	else
   1074  1.1  cgd 		clget = 0;
   1075  1.1  cgd 	m = m0;
   1076  1.1  cgd 	MGET(om, M_WAIT, MT_DATA);
   1077  1.1  cgd 	if (clget)
   1078  1.1  cgd 		MCLGET(om, M_WAIT);
   1079  1.1  cgd 	olen = om->m_len = 8;
   1080  1.1  cgd 	oleft = M_TRAILINGSPACE(om);
   1081  1.1  cgd 	op = mtod(om, u_char *);
   1082  1.1  cgd 	retm = om;
   1083  1.1  cgd 	mp = &om->m_next;
   1084  1.1  cgd 	if (m->m_len >= 6) {
   1085  1.1  cgd 		ileft = m->m_len - 6;
   1086  1.1  cgd 		ip = mtod(m, u_char *);
   1087  1.1  cgd 		*((u_long *)op) = *((u_long *)ip);
   1088  1.1  cgd 		bzero(op + 4, 3);
   1089  1.1  cgd 		ip += 4;
   1090  1.1  cgd 		op += 7;
   1091  1.1  cgd 		if (*ip == '\0') {
   1092  1.1  cgd 			m_freem(om);
   1093  1.1  cgd 			return (m0);
   1094  1.1  cgd 		}
   1095  1.1  cgd 		*op++ = *ip++ - 1;
   1096  1.1  cgd 		cp = *ip++;
   1097  1.1  cgd 	} else {
   1098  1.1  cgd 		ileft = m->m_len;
   1099  1.1  cgd 		ip = mtod(m, u_char *);
   1100  1.1  cgd 		nfscget(*op++);
   1101  1.1  cgd 		nfscget(*op++);
   1102  1.1  cgd 		nfscget(*op++);
   1103  1.1  cgd 		nfscget(*op++);
   1104  1.1  cgd 		bzero(op, 3);
   1105  1.1  cgd 		op += 3;
   1106  1.1  cgd 		nfscget(*op);
   1107  1.1  cgd 		if (*op == '\0') {
   1108  1.1  cgd 			m_freem(om);
   1109  1.1  cgd 			return (m0);
   1110  1.1  cgd 		}
   1111  1.1  cgd 		(*op)--;
   1112  1.1  cgd 		op++;
   1113  1.1  cgd 		nfscget(cp);
   1114  1.1  cgd 	}
   1115  1.1  cgd 	noteof = 1;
   1116  1.1  cgd 	while (noteof) {
   1117  1.1  cgd 		if ((cp & NFSCRL) == NFSCRL) {
   1118  1.1  cgd 			nfscget(nextcp);
   1119  1.1  cgd 			if (cp == nextcp) {
   1120  1.1  cgd 				nfscput(cp);
   1121  1.1  cgd 				goto readit;
   1122  1.1  cgd 			} else {
   1123  1.1  cgd 				i = (cp & 0xf) + 2;
   1124  1.1  cgd 				for (j = 0; j < i; j++) {
   1125  1.1  cgd 					nfscput('\0');
   1126  1.1  cgd 				}
   1127  1.1  cgd 				cp = nextcp;
   1128  1.1  cgd 			}
   1129  1.1  cgd 		} else {
   1130  1.1  cgd 			nfscput(cp);
   1131  1.1  cgd readit:
   1132  1.1  cgd 			nfscget(cp);
   1133  1.1  cgd 		}
   1134  1.1  cgd 	}
   1135  1.1  cgd 	m_freem(m0);
   1136  1.1  cgd 	if (i = (olen & 0x3))
   1137  1.1  cgd 		om->m_len -= i;
   1138  1.1  cgd 	return (retm);
   1139  1.1  cgd }
   1140