+/*
+ * 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.
+ *
+ * @(#)nfs_subs.c 7.1 (Berkeley) %G%
+ */
+
+/*
+ * These functions support the macros and help fiddle mbuf chains for
+ * the nfs op functions. They do things like create the rpc header and
+ * copy data between mbuf chains and uio lists.
+ */
+#include "strings.h"
+#include "types.h"
+#include "param.h"
+#include "mount.h"
+#include "dir.h"
+#include "time.h"
+#include "errno.h"
+#include "kernel.h"
+#include "malloc.h"
+#include "mbuf.h"
+#include "file.h"
+#include "vnode.h"
+#include "uio.h"
+#include "namei.h"
+#include "ucred.h"
+#include "rpcv2.h"
+#include "nfsv2.h"
+#include "nfsnode.h"
+#include "nfs.h"
+#include "xdr_subs.h"
+#include "nfsm_subs.h"
+
+#define TRUE 1
+#define FALSE 0
+
+/*
+ * Data items converted to xdr at startup, since they are constant
+ * This is kinda hokey, but may save a little time doing byte swaps
+ */
+u_long nfs_procids[NFS_NPROCS];
+u_long nfs_xdrneg1;
+u_long rpc_call, rpc_vers, rpc_reply, rpc_msgdenied,
+ rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
+u_long nfs_vers, nfs_prog, nfs_true, nfs_false;
+/* And other global data */
+static u_long *rpc_uidp = (u_long *)0;
+static u_long nfs_xid = 1;
+static char *rpc_unixauth;
+extern long hostid;
+extern enum vtype v_type[NFLNK+1];
+
+/* Function ret types */
+static char *nfs_unixauth();
+
+/*
+ * Create the header for an rpc request packet
+ * The function nfs_unixauth() creates a unix style authorization string
+ * and returns a ptr to it.
+ * The hsiz is the size of the rest of the nfs request header.
+ * (just used to decide if a cluster is a good idea)
+ * nb: Note that the prog, vers and proc args are already in xdr byte order
+ */
+struct mbuf *nfsm_reqh(prog, vers, proc, cred, hsiz, bpos, mb, retxid)
+ u_long prog;
+ u_long vers;
+ u_long proc;
+ struct ucred *cred;
+ int hsiz;
+ caddr_t *bpos;
+ struct mbuf **mb;
+ u_long *retxid;
+{
+ register struct mbuf *mreq, *m;
+ register u_long *p;
+ struct mbuf *m1;
+ char *ap;
+ int asiz, siz;
+
+ NFSMGETHDR(mreq);
+ asiz = (((cred->cr_ngroups > 10) ? 10 : cred->cr_ngroups)<<2);
+ asiz += nfsm_rndup(hostnamelen)+(9*NFSX_UNSIGNED);
+
+ /* If we need a lot, alloc a cluster ?? */
+ if ((asiz+hsiz+RPC_SIZ) > MHLEN)
+ NFSMCLGET(mreq, M_WAIT);
+ mreq->m_len = NFSMSIZ(mreq);
+ siz = mreq->m_len;
+ m1 = mreq;
+ /*
+ * Alloc enough mbufs
+ * We do it now to avoid all sleeps after the call to nfs_unixauth()
+ */
+ while ((asiz+RPC_SIZ) > siz) {
+ MGET(m, M_WAIT, MT_DATA);
+ m1->m_next = m;
+ m->m_len = MLEN;
+ siz += MLEN;
+ m1 = m;
+ }
+ p = mtod(mreq, u_long *);
+ *p++ = *retxid = txdr_unsigned(++nfs_xid);
+ *p++ = rpc_call;
+ *p++ = rpc_vers;
+ *p++ = prog;
+ *p++ = vers;
+ *p++ = proc;
+
+ /* Now we can call nfs_unixauth() and copy it in */
+ ap = nfs_unixauth(cred);
+ m = mreq;
+ siz = m->m_len-RPC_SIZ;
+ if (asiz <= siz) {
+ bcopy(ap, (caddr_t)p, asiz);
+ m->m_len = asiz+RPC_SIZ;
+ } else {
+ bcopy(ap, (caddr_t)p, siz);
+ ap += siz;
+ asiz -= siz;
+ while (asiz > 0) {
+ siz = (asiz > MLEN) ? MLEN : asiz;
+ m = m->m_next;
+ bcopy(ap, mtod(m, caddr_t), siz);
+ m->m_len = siz;
+ asiz -= siz;
+ ap += siz;
+ }
+ }
+
+ /* Finally, return values */
+ *mb = m;
+ *bpos = mtod(m, caddr_t)+m->m_len;
+ return (mreq);
+}
+
+/*
+ * copies mbuf chain to the uio scatter/gather list
+ */
+nfsm_mbuftouio(mrep, uiop, siz, dpos)
+ struct mbuf **mrep;
+ struct uio *uiop;
+ int siz;
+ caddr_t *dpos;
+{
+ register int xfer, left, len;
+ register struct mbuf *mp;
+ register char *mbufcp, *uiocp;
+ long uiosiz, rem;
+
+ mp = *mrep;
+ mbufcp = *dpos;
+ len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
+ rem = nfsm_rndup(siz)-siz;
+ while (siz > 0) {
+ if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
+ return(EFBIG);
+ left = uiop->uio_iov->iov_len;
+ uiocp = uiop->uio_iov->iov_base;
+ if (left > siz)
+ left = siz;
+ uiosiz = left;
+ while (left > 0) {
+ while (len == 0) {
+ mp = mp->m_next;
+ if (mp == NULL)
+ return (EBADRPC);
+ mbufcp = mtod(mp, caddr_t);
+ len = mp->m_len;
+ }
+ xfer = (left > len) ? len : left;
+#ifdef notdef
+ /* Not Yet.. */
+ if (uiop->uio_iov->iov_op != NULL)
+ (*(uiop->uio_iov->iov_op))
+ (mbufcp, uiocp, xfer);
+ else
+#endif
+ if (uiop->uio_segflg == UIO_SYSSPACE)
+ bcopy(mbufcp, uiocp, xfer);
+ else
+ copyout(mbufcp, uiocp, xfer);
+ left -= xfer;
+ len -= xfer;
+ mbufcp += xfer;
+ uiocp += xfer;
+ uiop->uio_resid -= xfer;
+ }
+ if (uiop->uio_iov->iov_len <= siz) {
+ uiop->uio_iovcnt--;
+ uiop->uio_iov++;
+ } else {
+ uiop->uio_iov->iov_base += uiosiz;
+ uiop->uio_iov->iov_len -= uiosiz;
+ }
+ siz -= uiosiz;
+ }
+ if (rem > 0)
+ mbufcp += rem;
+ *dpos = mbufcp;
+ *mrep = mp;
+ return(0);
+}
+
+/*
+ * copies a uio scatter/gather list to an mbuf chain...
+ */
+nfsm_uiotombuf(uiop, mq, siz, bpos)
+ register struct uio *uiop;
+ struct mbuf **mq;
+ int siz;
+ caddr_t *bpos;
+{
+ register struct mbuf *mp;
+ struct mbuf *mp2;
+ long xfer, left, uiosiz, off;
+ int clflg;
+ int rem, len;
+ char *cp, *uiocp;
+
+ if (siz > MLEN) /* or should it >= MCLBYTES ?? */
+ clflg = 1;
+ else
+ clflg = 0;
+ rem = nfsm_rndup(siz)-siz;
+ mp2 = *mq;
+ while (siz > 0) {
+ if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
+ return(EINVAL);
+ left = uiop->uio_iov->iov_len;
+ uiocp = uiop->uio_iov->iov_base;
+ if (left > siz)
+ left = siz;
+ uiosiz = left;
+ while (left > 0) {
+ MGET(mp, M_WAIT, MT_DATA);
+ if (clflg)
+ NFSMCLGET(mp, M_WAIT);
+ mp->m_len = NFSMSIZ(mp);
+ mp2->m_next = mp;
+ mp2 = mp;
+ xfer = (left > mp->m_len) ? mp->m_len : left;
+#ifdef notdef
+ /* Not Yet.. */
+ if (uiop->uio_iov->iov_op != NULL)
+ (*(uiop->uio_iov->iov_op))
+ (uiocp, mtod(mp, caddr_t), xfer);
+ else
+#endif
+ if (uiop->uio_segflg == UIO_SYSSPACE)
+ bcopy(uiocp, mtod(mp, caddr_t), xfer);
+ else
+ copyin(uiocp, mtod(mp, caddr_t), xfer);
+ len = mp->m_len;
+ mp->m_len = xfer;
+ left -= xfer;
+ uiocp += xfer;
+ uiop->uio_resid -= xfer;
+ }
+ if (uiop->uio_iov->iov_len <= siz) {
+ uiop->uio_iovcnt--;
+ uiop->uio_iov++;
+ } else {
+ uiop->uio_iov->iov_base += uiosiz;
+ uiop->uio_iov->iov_len -= uiosiz;
+ }
+ siz -= uiosiz;
+ }
+ if (rem > 0) {
+ if (rem > (len-mp->m_len)) {
+ MGET(mp, M_WAIT, MT_DATA);
+ mp->m_len = 0;
+ mp2->m_next = mp;
+ }
+ cp = mtod(mp, caddr_t)+mp->m_len;
+ for (left = 0; left < rem; left++)
+ *cp++ = '\0';
+ mp->m_len += rem;
+ *bpos = cp;
+ } else
+ *bpos = mtod(mp, caddr_t)+mp->m_len;
+ *mq = mp;
+ return(0);
+}
+
+/*
+ * Help break down an mbuf chain by setting the first siz bytes contiguous
+ * pointed to by returned val.
+ * If Updateflg == True we can overwrite the first part of the mbuf data
+ * This is used by the macros nfsm_disect and nfsm_disecton for tough
+ * cases. (The macros use the vars. dpos and dpos2)
+ */
+nfsm_disct(mdp, dposp, siz, left, updateflg, cp2)
+ struct mbuf **mdp;
+ caddr_t *dposp;
+ int siz;
+ int left;
+ int updateflg;
+ caddr_t *cp2;
+{
+ register struct mbuf *mp, *mp2;
+ register int siz2, xfer;
+ register caddr_t p;
+ caddr_t p2;
+
+ mp = *mdp;
+ while (left == 0) {
+ *mdp = mp = mp->m_next;
+ if (mp == NULL)
+ return(EBADRPC);
+ left = mp->m_len;
+ *dposp = mtod(mp, caddr_t);
+ }
+ if (left >= siz) {
+ *cp2 = *dposp;
+ *dposp += siz;
+ return(0);
+ } else if (mp->m_next == NULL) {
+ return(EBADRPC);
+ } else if (siz > MCLBYTES) {
+ panic("nfs S too big");
+ } else {
+ /* Iff update, you can overwrite, else must alloc new mbuf */
+ if (updateflg) {
+ NFSMINOFF(mp);
+ } else {
+ MGET(mp2, M_WAIT, MT_DATA);
+ mp2->m_next = mp->m_next;
+ mp->m_next = mp2;
+ mp->m_len -= left;
+ mp = mp2;
+ }
+ /* Alloc cluster iff we need it */
+ if (!M_HASCL(mp) && siz > NFSMSIZ(mp)) {
+ NFSMCLGET(mp, M_WAIT);
+ if (!M_HASCL(mp))
+ return(ENOBUFS);
+ }
+ *cp2 = p = mtod(mp, caddr_t);
+ bcopy(*dposp, p, left); /* Copy what was left */
+ siz2 = siz-left;
+ p += left;
+ mp2 = mp->m_next;
+ /* Loop arround copying up the siz2 bytes */
+ while (siz2 > 0) {
+ if (mp2 == NULL)
+ return (EBADRPC);
+ xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
+ bcopy(mtod(mp2, caddr_t), p, xfer);
+ NFSMADV(mp2, xfer);
+ mp2->m_len -= xfer;
+ siz2 -= xfer;
+ if (siz2 > 0)
+ mp2 = mp2->m_next;
+ }
+ mp->m_len = siz;
+ *mdp = mp2;
+ *dposp = mtod(mp2, caddr_t);
+ return (0);
+ }
+}
+
+/*
+ * Advance the position in the mbuf chain with/without freeing mbufs
+ */
+nfs_adv(mdp, dposp, offs, left)
+ struct mbuf **mdp;
+ caddr_t *dposp;
+ int offs;
+ int left;
+{
+ register struct mbuf *m;
+ register int s;
+
+ m = *mdp;
+ s = left;
+ while (s < offs) {
+ offs -= s;
+ m = m->m_next;
+ if (m == NULL)
+ return(EBADRPC);
+ s = m->m_len;
+ }
+ *mdp = m;
+ *dposp = mtod(m, caddr_t)+offs;
+ return(0);
+}
+
+/*
+ * Copy a string into mbufs for the hard cases...
+ */
+nfsm_strtmbuf(mb, bpos, cp, siz)
+ struct mbuf **mb;
+ char **bpos;
+ char *cp;
+ long siz;
+{
+ register struct mbuf *m1, *m2;
+ long left, xfer, len, tlen;
+ u_long *p;
+ int putsize;
+
+ putsize = 1;
+ m2 = *mb;
+ left = NFSMSIZ(m2)-m2->m_len;
+ if (left > 0) {
+ p = ((u_long *)(*bpos));
+ *p++ = txdr_unsigned(siz);
+ putsize = 0;
+ left -= NFSX_UNSIGNED;
+ m2->m_len += NFSX_UNSIGNED;
+ if (left > 0) {
+ bcopy(cp, (caddr_t) p, left);
+ siz -= left;
+ cp += left;
+ m2->m_len += left;
+ left = 0;
+ }
+ }
+ /* Loop arround adding mbufs */
+ while (siz > 0) {
+ MGET(m1, M_WAIT, MT_DATA);
+ if (siz > MLEN)
+ NFSMCLGET(m1, M_WAIT);
+ m1->m_len = NFSMSIZ(m1);
+ m2->m_next = m1;
+ m2 = m1;
+ p = mtod(m1, u_long *);
+ tlen = 0;
+ if (putsize) {
+ *p++ = txdr_unsigned(siz);
+ m1->m_len -= NFSX_UNSIGNED;
+ tlen = NFSX_UNSIGNED;
+ putsize = 0;
+ }
+ if (siz < m1->m_len) {
+ len = nfsm_rndup(siz);
+ xfer = siz;
+ if (xfer < len)
+ *(p+(xfer>>2)) = 0;
+ } else {
+ xfer = len = m1->m_len;
+ }
+ bcopy(cp, (caddr_t) p, xfer);
+ m1->m_len = len+tlen;
+ siz -= xfer;
+ cp += xfer;
+ }
+ *mb = m1;
+ *bpos = mtod(m1, caddr_t)+m1->m_len;
+ return(0);
+}
+
+/*
+ * Called once to initialize data structures...
+ */
+nfsinit()
+{
+ register int i;
+
+ rpc_vers = txdr_unsigned(RPC_VER2);
+ rpc_call = txdr_unsigned(RPC_CALL);
+ rpc_reply = txdr_unsigned(RPC_REPLY);
+ rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
+ rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
+ rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
+ rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
+ nfs_vers = txdr_unsigned(NFS_VER2);
+ nfs_prog = txdr_unsigned(NFS_PROG);
+ nfs_true = txdr_unsigned(TRUE);
+ nfs_false = txdr_unsigned(FALSE);
+ /* Loop thru nfs procids */
+ for (i = 0; i < NFS_NPROCS; i++)
+ nfs_procids[i] = txdr_unsigned(i);
+ v_type[0] = VNON;
+ v_type[1] = VREG;
+ v_type[2] = VDIR;
+ v_type[3] = VBLK;
+ v_type[4] = VCHR;
+ v_type[5] = VLNK;
+ nfs_xdrneg1 = txdr_unsigned(-1);
+ nfs_nhinit(); /* Init the nfsnode table */
+ /* And start timer */
+ nfs_timer();
+}
+
+/*
+ * Fill in the rest of the rpc_unixauth and return it
+ */
+static char *nfs_unixauth(cr)
+ register struct ucred *cr;
+{
+ register u_long *p;
+ register int i;
+ int ngr;
+
+ /* Maybe someday there should be a cache of AUTH_SHORT's */
+ if ((p = rpc_uidp) == NULL) {
+ i = nfsm_rndup(hostnamelen)+(19*NFSX_UNSIGNED);
+ MALLOC(p, u_long *, i, M_TEMP, M_WAITOK);
+ bzero((caddr_t)p, i);
+ rpc_unixauth = (caddr_t)p;
+ *p++ = txdr_unsigned(RPCAUTH_UNIX);
+ p++; /* Fill in size later */
+ *p++ = hostid;
+ *p++ = txdr_unsigned(hostnamelen);
+ i = nfsm_rndup(hostnamelen);
+ bcopy(hostname, (caddr_t)p, hostnamelen);
+ p += (i>>2);
+ rpc_uidp = p;
+ }
+ *p++ = txdr_unsigned(cr->cr_uid);
+ *p++ = txdr_unsigned(cr->cr_groups[0]);
+ ngr = (cr->cr_ngroups > 10) ? 10 : cr->cr_ngroups;
+ *p++ = txdr_unsigned(ngr);
+ for (i = 0; i < ngr; i++)
+ *p++ = txdr_unsigned(cr->cr_groups[i]);
+ /* And add the AUTH_NULL */
+ *p++ = 0;
+ *p = 0;
+ i = (((caddr_t)p)-rpc_unixauth)-12;
+ p = (u_long *)(rpc_unixauth+4);
+ *p = txdr_unsigned(i);
+ return(rpc_unixauth);
+}
+
+/*
+ * Attribute cache routines.
+ * nfs_loadattrcache() - loads or updates the cache contents from attributes
+ * that are on the mbuf list
+ * nfs_getattrcache() - returns valid attributes if found in cache, returns
+ * error otherwise
+ */
+
+/*
+ * Load the attribute cache (that lives in the nfsnode table) with
+ * the values on the mbuf list and
+ * Iff vap not NULL
+ * copy the attributes to *vaper
+ */
+nfs_loadattrcache(vp, mdp, dposp, vaper)
+ register struct vnode *vp;
+ struct mbuf **mdp;
+ caddr_t *dposp;
+ struct vattr *vaper;
+{
+ register struct vattr *vap;
+ nfsm_vars;
+ struct nfsnode *np;
+
+ md = *mdp;
+ dpos = *dposp;
+ t1 = (mtod(md, caddr_t)+md->m_len)-dpos;
+ if (error = nfsm_disct(&md, &dpos, NFSX_FATTR, t1, TRUE, &cp2))
+ return (error);
+ p = (u_long *)cp2;
+ np = VTONFS(vp);
+ vap = &np->n_vattr;
+ vap->va_type = nfstov_type(*p++);
+ vap->va_mode = nfstov_mode(*p++);
+ vap->va_nlink = fxdr_unsigned(u_short, *p++);
+ vap->va_uid = fxdr_unsigned(uid_t, *p++);
+ vap->va_gid = fxdr_unsigned(gid_t, *p++);
+ vap->va_size = fxdr_unsigned(u_long, *p++);
+ vap->va_size1 = 0; /* OR -1 ?? */
+ vap->va_blocksize = fxdr_unsigned(long, *p++);
+ vap->va_rdev = fxdr_unsigned(dev_t, *p++);
+ vap->va_bytes = fxdr_unsigned(long, *p++);
+ vap->va_bytes1 = -1;
+ vap->va_fsid = fxdr_unsigned(long, *p++);
+ vap->va_fileid = fxdr_unsigned(long, *p++);
+ fxdr_time(p, &(vap->va_atime));
+ p += 2;
+ fxdr_time(p, &(vap->va_mtime));
+ p += 2;
+ fxdr_time(p, &(vap->va_ctime));
+ np->n_attrstamp = time.tv_sec;
+ *dposp = dpos;
+ *mdp = md;
+ if (vaper != NULL)
+ bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
+ return (0);
+}
+
+/*
+ * Check the time stamp
+ * If the cache is valid, copy contents to *vap and return 0
+ * otherwise return an error
+ */
+nfs_getattrcache(vp, vap)
+ register struct vnode *vp;
+ struct vattr *vap;
+{
+ register struct nfsnode *np;
+
+ np = VTONFS(vp);
+ if ((time.tv_sec-np->n_attrstamp) < NFS_ATTRTIMEO) {
+ nfsstats.attrcache_hits++;
+ bcopy((caddr_t)&np->n_vattr,(caddr_t)vap,sizeof(struct vattr));
+ return (0);
+ } else {
+ nfsstats.attrcache_misses++;
+ return (ENOENT);
+ }
+}
+
+#ifndef OPFLAG
+#define OPFLAG (CREATE | DELETE | LOOKUP)
+#endif
+
+/*
+ * nfs_namei - a liitle like namei(), but for one element only
+ * essentially look up file handle, fill in ndp and call VOP_LOOKUP()
+ */
+nfs_namei(ndp, fhp, len, mdp, dposp)
+ register struct nameidata *ndp;
+ fhandle_t *fhp;
+ int len;
+ struct mbuf **mdp;
+ caddr_t *dposp;
+{
+ register int i, rem;
+ register struct mbuf *md;
+ register char *cp;
+ struct vnode *dp = (struct vnode *)0;
+ struct vnode *tdp;
+ struct mount *mp;
+ int flag;
+ int docache;
+ int wantparent;
+ int lockparent;
+ int rootflg = 0;
+ int error = 0;
+
+ ndp->ni_vp = ndp->ni_dvp = (struct vnode *)0;
+ flag = ndp->ni_nameiop & OPFLAG;
+ wantparent = ndp->ni_nameiop & (LOCKPARENT | WANTPARENT);
+ lockparent = ndp->ni_nameiop & LOCKPARENT;
+ docache = (ndp->ni_nameiop & NOCACHE) ^ NOCACHE;
+ if (flag == DELETE || wantparent)
+ docache = 0;
+
+ /* Fill in the nameidata and call lookup */
+ cp = *dposp;
+ md = *mdp;
+ rem = mtod(md, caddr_t)+md->m_len-cp;
+ ndp->ni_hash = 0;
+ for (i = 0; i < len;) {
+ if (rem == 0) {
+ md = md->m_next;
+ if (md == NULL)
+ return (EBADRPC);
+ cp = mtod(md, caddr_t);
+ rem = md->m_len;
+ }
+ if (*cp == '\0' || *cp == '/')
+ return (EINVAL);
+ if (*cp & 0200)
+ if ((*cp&0377) == ('/'|0200) || flag != DELETE)
+ return (EINVAL);
+ ndp->ni_dent.d_name[i++] = *cp;
+ ndp->ni_hash += (unsigned char)*cp * i;
+ cp++;
+ rem--;
+ }
+ *mdp = md;
+ len = nfsm_rndup(len)-len;
+ if (len > 0)
+ *dposp = cp+len;
+ else
+ *dposp = cp;
+ ndp->ni_namelen = i;
+ ndp->ni_dent.d_namlen = i;
+ ndp->ni_dent.d_name[i] = '\0';
+ ndp->ni_pathlen = 0;
+ ndp->ni_dirp = ndp->ni_ptr = &ndp->ni_dent.d_name[0];
+ ndp->ni_next = &ndp->ni_dent.d_name[i];
+ ndp->ni_loopcnt = 0; /* Not actually used for now */
+ ndp->ni_endoff = 0;
+ if (docache)
+ ndp->ni_makeentry = 1;
+ else
+ ndp->ni_makeentry = 0;
+ ndp->ni_isdotdot = (i == 2 &&
+ ndp->ni_dent.d_name[1] == '.' && ndp->ni_dent.d_name[0] == '.');
+
+ /*
+ * Must remember if this is root so that cr_uid can be set to
+ * mp->m_exroot at mount points
+ * Then call nfsrv_fhtovp() to get the locked directory vnode
+ */
+ if (ndp->ni_cred->cr_uid == 0)
+ rootflg++;
+ if (error = nfsrv_fhtovp(fhp, TRUE, &dp, ndp->ni_cred))
+ return (error);
+
+ /*
+ * Handle "..": two special cases.
+ * 1. If at root directory (e.g. after chroot)
+ * then ignore it so can't get out.
+ * 2. If this vnode is the root of a mounted
+ * file system, then replace it with the
+ * vnode which was mounted on so we take the
+ * .. in the other file system.
+ */
+ if (ndp->ni_isdotdot) {
+ for (;;) {
+ if (dp == rootdir) {
+ ndp->ni_dvp = dp;
+ dp->v_count++;
+ goto nextname;
+ }
+ if ((dp->v_flag & VROOT) == 0)
+ break;
+ tdp = dp;
+ dp = dp->v_mount->m_vnodecovered;
+ vput(tdp);
+ if ((dp->v_mount->m_flag & M_EXPORTED) == 0)
+ return (EACCES);
+ VOP_LOCK(dp);
+ dp->v_count++;
+ if (rootflg)
+ ndp->ni_cred->cr_uid = dp->v_mount->m_exroot;
+ }
+ }
+
+ /*
+ * We now have a segment name to search for, and a directory to search.
+ */
+ if (error = VOP_LOOKUP(dp, ndp)) {
+ if (ndp->ni_vp != NULL)
+ panic("leaf should be empty");
+ /*
+ * If creating and at end of pathname, then can consider
+ * allowing file to be created.
+ */
+ if (ndp->ni_dvp->v_mount->m_flag & (M_RDONLY | M_EXRDONLY))
+ error = EROFS;
+ if (flag == LOOKUP || flag == DELETE || error != ENOENT)
+ goto bad;
+ /*
+ * We return with ni_vp NULL to indicate that the entry
+ * doesn't currently exist, leaving a pointer to the
+ * (possibly locked) directory inode in ndp->ni_dvp.
+ */
+ return (0); /* should this be ENOENT? */
+ }
+
+ /*
+ * Check for symbolic link
+ */
+ dp = ndp->ni_vp;
+#ifdef notdef
+ if ((dp->v_type == VLNK) &&
+ (ndp->ni_nameiop & FOLLOW)) {
+ struct iovec aiov;
+ struct uio auio;
+ int linklen;
+
+ if (++ndp->ni_loopcnt > MAXSYMLINKS) {
+ error = ELOOP;
+ goto bad2;
+ }
+ MALLOC(cp, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ aiov.iov_base = cp;
+ aiov.iov_len = MAXPATHLEN;
+ auio.uio_iov = &aiov;
+ auio.uio_iovcnt = 1;
+ auio.uio_offset = 0;
+ auio.uio_rw = UIO_READ;
+ auio.uio_segflg = UIO_SYSSPACE;
+ auio.uio_resid = MAXPATHLEN;
+ if (error = VOP_READLINK(dp, &auio, ndp->ni_cred)) {
+ free(cp, M_NAMEI);
+ goto bad2;
+ }
+ linklen = MAXPATHLEN - auio.uio_resid;
+ if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
+ free(cp, M_NAMEI);
+ error = ENAMETOOLONG;
+ goto bad2;
+ }
+ bcopy(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
+ ndp->ni_pnbuf = cp;
+ } else
+ ndp->ni_pnbuf[linklen] = '\0';
+ ndp->ni_ptr = cp;
+ ndp->ni_pathlen += linklen;
+ vput(dp);
+ dp = ndp->ni_dvp;
+ goto start;
+ }
+#endif
+
+ /*
+ * Check to see if the vnode has been mounted on;
+ * if so find the root of the mounted file system.
+ * Ignore NFS mount points
+ */
+mntloop:
+ while (dp->v_type == VDIR && (mp = dp->v_mountedhere) &&
+ mp->m_fsid.val[1] != MOUNT_NFS) {
+ while(mp->m_flag & M_MLOCK) {
+ mp->m_flag |= M_MWAIT;
+ sleep((caddr_t)mp, PVFS);
+ goto mntloop;
+ }
+ error = VFS_ROOT(mp, &tdp);
+ if (error || (mp->m_flag & M_EXPORTED) == 0)
+ goto bad2;
+ vput(dp);
+ ndp->ni_vp = dp = tdp;
+ if (rootflg)
+ ndp->ni_cred->cr_uid = mp->m_exroot;
+ }
+
+nextname:
+ /*
+ * Check for read-only file systems and executing texts
+ */
+ if (flag != LOOKUP && ((dp->v_mount->m_flag & (M_RDONLY | M_EXRDONLY)) ||
+ (error = vn_access(dp, VWRITE, ndp->ni_cred))))
+ goto bad2;
+
+ /*
+ * Kludge city... This is hokey, but since ufs_rename() calls
+ * namei() and namei() expects ni_cdir to be set, what can I
+ * do. Fortunately rename() holds onto the parent so I don't
+ * have to increment the v_count.
+ */
+ if (!wantparent)
+ vrele(ndp->ni_dvp);
+ else
+ ndp->ni_cdir = ndp->ni_dvp;
+
+ if ((ndp->ni_nameiop & LOCKLEAF) == 0)
+ VOP_UNLOCK(dp);
+ return (0);
+
+bad2:
+ if (lockparent)
+ VOP_UNLOCK(ndp->ni_dvp);
+ vrele(ndp->ni_dvp);
+bad:
+ vput(dp);
+ ndp->ni_vp = NULL;
+ return (error);
+}
+
+/*
+ * A fiddled version of m_adj() that ensures null fill to a long
+ * boundary and only trims off the back end
+ */
+nfsm_adj(mp, len, nul)
+ struct mbuf *mp;
+ register int len;
+ int nul;
+{
+ register struct mbuf *m;
+ register int count, i;
+ register char *cp;
+
+ /*
+ * Trim from tail. Scan the mbuf chain,
+ * calculating its length and finding the last mbuf.
+ * If the adjustment only affects this mbuf, then just
+ * adjust and return. Otherwise, rescan and truncate
+ * after the remaining size.
+ */
+ count = 0;
+ m = mp;
+ for (;;) {
+ count += m->m_len;
+ if (m->m_next == (struct mbuf *)0)
+ break;
+ m = m->m_next;
+ }
+ if (m->m_len >= len) {
+ m->m_len -= len;
+ if (nul > 0) {
+ cp = mtod(m, caddr_t)+m->m_len-nul;
+ for (i = 0; i < nul; i++)
+ *cp++ = '\0';
+ }
+ return;
+ }
+ count -= len;
+ if (count < 0)
+ count = 0;
+ /*
+ * Correct length for chain is "count".
+ * Find the mbuf with last data, adjust its length,
+ * and toss data from remaining mbufs on chain.
+ */
+ for (m = mp; m; m = m->m_next) {
+ if (m->m_len >= count) {
+ m->m_len = count;
+ if (nul > 0) {
+ cp = mtod(m, caddr_t)+m->m_len-nul;
+ for (i = 0; i < nul; i++)
+ *cp++ = '\0';
+ }
+ break;
+ }
+ count -= m->m_len;
+ }
+ while (m = m->m_next)
+ m->m_len = 0;
+}
+
+/*
+ * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
+ * - look up fsid in mount list (if not found ret error)
+ * - check that it is exported
+ * - get vp by calling VFS_FHTOVP() macro
+ * - if not lockflag unlock it with VOP_UNLOCK()
+ * - if cred->cr_uid == 0 set it to m_exroot
+ */
+nfsrv_fhtovp(fhp, lockflag, vpp, cred)
+ fhandle_t *fhp;
+ int lockflag;
+ struct vnode **vpp;
+ struct ucred *cred;
+{
+ register struct mount *mp;
+ int error;
+
+ if ((mp = getvfs(&fhp->fh_fsid)) == NULL)
+ return (ESTALE);
+ if ((mp->m_flag & M_EXPORTED) == 0)
+ return (EACCES);
+ if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp))
+ return (ESTALE);
+ if (cred->cr_uid == 0)
+ cred->cr_uid = mp->m_exroot;
+ if (!lockflag)
+ VOP_UNLOCK(*vpp);
+ return (0);
+}
+
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