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- /*
- * 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, 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.
- *
- * @(#)nfs_subs.c 7.41 (Berkeley) 5/15/91
- */
-
- /*
- * 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 "param.h"
- #include "proc.h"
- #include "filedesc.h"
- #include "systm.h"
- #include "kernel.h"
- #include "mount.h"
- #include "file.h"
- #include "vnode.h"
- #include "namei.h"
- #include "mbuf.h"
- #include "map.h"
-
- #include "../ufs/quota.h"
- #include "../ufs/inode.h"
-
- #include "rpcv2.h"
- #include "nfsv2.h"
- #include "nfsnode.h"
- #include "nfs.h"
- #include "nfsiom.h"
- #include "xdr_subs.h"
- #include "nfsm_subs.h"
- #include "nfscompress.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;
- enum vtype ntov_type[7] = { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON };
- extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
- extern struct map nfsmap[NFS_MSIZ];
- extern struct nfsreq nfsreqh;
-
- /* Function ret types */
- static char *nfs_unixauth();
-
- /*
- * Maximum number of groups passed through to NFS server.
- * According to RFC1057 it should be 16.
- * For release 3.X systems, the maximum value is 8.
- * For some other servers, the maximum value is 10.
- */
- int numgrps = 8;
-
- /*
- * 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 procid args are already in xdr byte order
- */
- struct mbuf *nfsm_reqh(prog, vers, procid, cred, hsiz, bpos, mb, retxid)
- u_long prog;
- u_long vers;
- u_long procid;
- struct ucred *cred;
- int hsiz;
- caddr_t *bpos;
- struct mbuf **mb;
- u_long *retxid;
- {
- register struct mbuf *mreq, *m;
- register u_long *tl;
- struct mbuf *m1;
- char *ap;
- int asiz, siz;
-
- NFSMGETHDR(mreq);
- asiz = ((((cred->cr_ngroups - 1) > numgrps) ? numgrps :
- (cred->cr_ngroups - 1)) << 2);
- #ifdef FILLINHOST
- asiz += nfsm_rndup(hostnamelen)+(9*NFSX_UNSIGNED);
- #else
- asiz += 9*NFSX_UNSIGNED;
- #endif
-
- /* If we need a lot, alloc a cluster ?? */
- if ((asiz+hsiz+RPC_SIZ) > MHLEN)
- MCLGET(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;
- }
- tl = mtod(mreq, u_long *);
- *tl++ = *retxid = txdr_unsigned(++nfs_xid);
- *tl++ = rpc_call;
- *tl++ = rpc_vers;
- *tl++ = prog;
- *tl++ = vers;
- *tl++ = procid;
-
- /* 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)tl, asiz);
- m->m_len = asiz+RPC_SIZ;
- } else {
- bcopy(ap, (caddr_t)tl, 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;
- register struct uio *uiop;
- int siz;
- caddr_t *dpos;
- {
- register char *mbufcp, *uiocp;
- register int xfer, left, len;
- register struct mbuf *mp;
- long uiosiz, rem;
- int error = 0;
-
- 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_offset += 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;
- }
- *dpos = mbufcp;
- *mrep = mp;
- if (rem > 0) {
- if (len < rem)
- error = nfs_adv(mrep, dpos, rem, len);
- else
- *dpos += rem;
- }
- return (error);
- }
-
- /*
- * 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 char *uiocp;
- register struct mbuf *mp, *mp2;
- register int xfer, left, len;
- int uiosiz, clflg, rem;
- char *cp;
-
- 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)
- MCLGET(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_offset += 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 tl;
-
- 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;
- } else if (mp->m_next == NULL) {
- return (EBADRPC);
- } else if (siz > MHLEN) {
- 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;
- }
- *cp2 = tl = mtod(mp, caddr_t);
- bcopy(*dposp, tl, left); /* Copy what was left */
- siz2 = siz-left;
- tl += left;
- mp2 = mp->m_next;
- /* Loop around copying up the siz2 bytes */
- while (siz2 > 0) {
- if (mp2 == NULL)
- return (EBADRPC);
- xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
- if (xfer > 0) {
- bcopy(mtod(mp2, caddr_t), tl, xfer);
- NFSMADV(mp2, xfer);
- mp2->m_len -= xfer;
- tl += 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.
- */
- 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 *tl;
- int putsize;
-
- putsize = 1;
- m2 = *mb;
- left = NFSMSIZ(m2)-m2->m_len;
- if (left > 0) {
- tl = ((u_long *)(*bpos));
- *tl++ = txdr_unsigned(siz);
- putsize = 0;
- left -= NFSX_UNSIGNED;
- m2->m_len += NFSX_UNSIGNED;
- if (left > 0) {
- bcopy(cp, (caddr_t) tl, 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)
- MCLGET(m1, M_WAIT);
- m1->m_len = NFSMSIZ(m1);
- m2->m_next = m1;
- m2 = m1;
- tl = mtod(m1, u_long *);
- tlen = 0;
- if (putsize) {
- *tl++ = 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)
- *(tl+(xfer>>2)) = 0;
- } else {
- xfer = len = m1->m_len;
- }
- bcopy(cp, (caddr_t) tl, 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...
- */
- nfs_init()
- {
- 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);
- /* Ensure async daemons disabled */
- for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
- nfs_iodwant[i] = (struct proc *)0;
- nfs_xdrneg1 = txdr_unsigned(-1);
- nfs_nhinit(); /* Init the nfsnode table */
- nfsrv_initcache(); /* Init the server request cache */
- rminit(nfsmap, (long)NFS_MAPREG, (long)1, "nfs mapreg", NFS_MSIZ);
-
- /*
- * Initialize reply list and start timer
- */
- nfsreqh.r_prev = nfsreqh.r_next = &nfsreqh;
- 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 *tl;
- register int i;
- int ngr;
-
- /* Maybe someday there should be a cache of AUTH_SHORT's */
- if ((tl = rpc_uidp) == NULL) {
- #ifdef FILLINHOST
- i = nfsm_rndup(hostnamelen)+(25*NFSX_UNSIGNED);
- #else
- i = 25*NFSX_UNSIGNED;
- #endif
- MALLOC(tl, u_long *, i, M_TEMP, M_WAITOK);
- bzero((caddr_t)tl, i);
- rpc_unixauth = (caddr_t)tl;
- *tl++ = txdr_unsigned(RPCAUTH_UNIX);
- tl++; /* Fill in size later */
- *tl++ = hostid;
- #ifdef FILLINHOST
- *tl++ = txdr_unsigned(hostnamelen);
- i = nfsm_rndup(hostnamelen);
- bcopy(hostname, (caddr_t)tl, hostnamelen);
- tl += (i>>2);
- #else
- *tl++ = 0;
- #endif
- rpc_uidp = tl;
- }
- *tl++ = txdr_unsigned(cr->cr_uid);
- *tl++ = txdr_unsigned(cr->cr_groups[0]);
- ngr = ((cr->cr_ngroups - 1) > numgrps) ? numgrps : (cr->cr_ngroups - 1);
- *tl++ = txdr_unsigned(ngr);
- for (i = 1; i <= ngr; i++)
- *tl++ = txdr_unsigned(cr->cr_groups[i]);
- /* And add the AUTH_NULL */
- *tl++ = 0;
- *tl = 0;
- i = (((caddr_t)tl)-rpc_unixauth)-12;
- tl = (u_long *)(rpc_unixauth+4);
- *tl = 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 entry) with
- * the values on the mbuf list and
- * Iff vap not NULL
- * copy the attributes to *vaper
- */
- nfs_loadattrcache(vpp, mdp, dposp, vaper)
- struct vnode **vpp;
- struct mbuf **mdp;
- caddr_t *dposp;
- struct vattr *vaper;
- {
- register struct vnode *vp = *vpp;
- register struct vattr *vap;
- register struct nfsv2_fattr *fp;
- extern struct vnodeops spec_nfsv2nodeops;
- register struct nfsnode *np;
- register long t1;
- caddr_t dpos, cp2;
- int error = 0;
- struct mbuf *md;
- enum vtype type;
- u_short mode;
- long rdev;
- struct timeval mtime;
- struct vnode *nvp;
-
- 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);
- fp = (struct nfsv2_fattr *)cp2;
- type = nfstov_type(fp->fa_type);
- mode = fxdr_unsigned(u_short, fp->fa_mode);
- if (type == VNON)
- type = IFTOVT(mode);
- rdev = fxdr_unsigned(long, fp->fa_rdev);
- fxdr_time(&fp->fa_mtime, &mtime);
- /*
- * If v_type == VNON it is a new node, so fill in the v_type,
- * n_mtime fields. Check to see if it represents a special
- * device, and if so, check for a possible alias. Once the
- * correct vnode has been obtained, fill in the rest of the
- * information.
- */
- np = VTONFS(vp);
- if (vp->v_type == VNON) {
- if (type == VCHR && rdev == 0xffffffff)
- vp->v_type = type = VFIFO;
- else
- vp->v_type = type;
- if (vp->v_type == VFIFO) {
- #ifdef FIFO
- extern struct vnodeops fifo_nfsv2nodeops;
- vp->v_op = &fifo_nfsv2nodeops;
- #else
- return (EOPNOTSUPP);
- #endif /* FIFO */
- }
- if (vp->v_type == VCHR || vp->v_type == VBLK) {
- vp->v_op = &spec_nfsv2nodeops;
- if (nvp = checkalias(vp, (dev_t)rdev, vp->v_mount)) {
- /*
- * Reinitialize aliased node.
- */
- np = VTONFS(nvp);
- np->n_vnode = nvp;
- np->n_flag = 0;
- nfs_lock(nvp);
- bcopy((caddr_t)&VTONFS(vp)->n_fh,
- (caddr_t)&np->n_fh, NFSX_FH);
- insque(np, nfs_hash(&np->n_fh));
- np->n_attrstamp = 0;
- np->n_sillyrename = (struct sillyrename *)0;
- /*
- * Discard unneeded vnode and update actual one
- */
- vput(vp);
- *vpp = nvp;
- }
- }
- np->n_mtime = mtime.tv_sec;
- }
- vap = &np->n_vattr;
- vap->va_type = type;
- vap->va_mode = (mode & 07777);
- vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
- vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
- vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
- vap->va_size = fxdr_unsigned(u_long, fp->fa_size);
- if ((np->n_flag & NMODIFIED) == 0 || vap->va_size > np->n_size) {
- np->n_size = vap->va_size;
- vnode_pager_setsize(vp, np->n_size);
- }
- vap->va_size_rsv = 0;
- vap->va_blocksize = fxdr_unsigned(long, fp->fa_blocksize);
- vap->va_rdev = (dev_t)rdev;
- vap->va_bytes = fxdr_unsigned(long, fp->fa_blocks) * NFS_FABLKSIZE;
- vap->va_bytes_rsv = 0;
- vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
- vap->va_fileid = fxdr_unsigned(long, fp->fa_fileid);
- vap->va_atime.tv_sec = fxdr_unsigned(long, fp->fa_atime.tv_sec);
- vap->va_atime.tv_usec = 0;
- vap->va_flags = fxdr_unsigned(u_long, fp->fa_atime.tv_usec);
- vap->va_mtime = mtime;
- vap->va_ctime.tv_sec = fxdr_unsigned(long, fp->fa_ctime.tv_sec);
- vap->va_ctime.tv_usec = 0;
- vap->va_gen = fxdr_unsigned(u_long, fp->fa_ctime.tv_usec);
- np->n_attrstamp = time.tv_sec;
- *dposp = dpos;
- *mdp = md;
- if (vaper != NULL) {
- bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
- if ((np->n_flag & NMODIFIED) && (np->n_size > vap->va_size))
- vaper->va_size = np->n_size;
- }
- 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));
- if ((np->n_flag & NMODIFIED) == 0) {
- np->n_size = vap->va_size;
- vnode_pager_setsize(vp, np->n_size);
- } else if (np->n_size > vap->va_size)
- vap->va_size = np->n_size;
- return (0);
- } else {
- nfsstats.attrcache_misses++;
- return (ENOENT);
- }
- }
-
- /*
- * Set up nameidata for a namei() call and do it
- */
- nfs_namei(ndp, fhp, len, mdp, dposp, p)
- register struct nameidata *ndp;
- fhandle_t *fhp;
- int len;
- struct mbuf **mdp;
- caddr_t *dposp;
- struct proc *p;
- {
- register int i, rem;
- register struct mbuf *md;
- register char *fromcp, *tocp;
- struct vnode *dp;
- int flag;
- int error;
-
- flag = ndp->ni_nameiop & OPMASK;
- MALLOC(ndp->ni_pnbuf, char *, len + 1, M_NAMEI, M_WAITOK);
- /*
- * Copy the name from the mbuf list to ndp->ni_pnbuf
- * and set the various ndp fields appropriately.
- */
- fromcp = *dposp;
- tocp = ndp->ni_pnbuf;
- md = *mdp;
- rem = mtod(md, caddr_t) + md->m_len - fromcp;
- ndp->ni_hash = 0;
- for (i = 0; i < len; i++) {
- while (rem == 0) {
- md = md->m_next;
- if (md == NULL) {
- error = EBADRPC;
- goto out;
- }
- fromcp = mtod(md, caddr_t);
- rem = md->m_len;
- }
- if (*fromcp == '\0' || *fromcp == '/') {
- error = EINVAL;
- goto out;
- }
- if (*fromcp & 0200)
- if ((*fromcp&0377) == ('/'|0200) || flag != DELETE) {
- error = EINVAL;
- goto out;
- }
- ndp->ni_hash += (unsigned char)*fromcp;
- *tocp++ = *fromcp++;
- rem--;
- }
- *tocp = '\0';
- *mdp = md;
- *dposp = fromcp;
- len = nfsm_rndup(len)-len;
- if (len > 0) {
- if (rem >= len)
- *dposp += len;
- else if (error = nfs_adv(mdp, dposp, len, rem))
- goto out;
- }
- ndp->ni_pathlen = tocp - ndp->ni_pnbuf;
- ndp->ni_ptr = ndp->ni_pnbuf;
- /*
- * Extract and set starting directory.
- */
- if (error = nfsrv_fhtovp(fhp, FALSE, &dp, ndp->ni_cred))
- goto out;
- if (dp->v_type != VDIR) {
- vrele(dp);
- error = ENOTDIR;
- goto out;
- }
- ndp->ni_startdir = dp;
- ndp->ni_nameiop |= (NOCROSSMOUNT | REMOTE);
- /*
- * And call lookup() to do the real work
- */
- if (error = lookup(ndp, p))
- goto out;
- /*
- * Check for encountering a symbolic link
- */
- if (ndp->ni_more) {
- if ((ndp->ni_nameiop & LOCKPARENT) && ndp->ni_pathlen == 1)
- vput(ndp->ni_dvp);
- else
- vrele(ndp->ni_dvp);
- vput(ndp->ni_vp);
- ndp->ni_vp = NULL;
- error = EINVAL;
- goto out;
- }
- /*
- * Check for saved name request
- */
- if (ndp->ni_nameiop & (SAVENAME | SAVESTART)) {
- ndp->ni_nameiop |= HASBUF;
- return (0);
- }
- out:
- FREE(ndp->ni_pnbuf, M_NAMEI);
- 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;
-
- if ((mp = getvfs(&fhp->fh_fsid)) == NULL)
- return (ESTALE);
- if ((mp->mnt_flag & MNT_EXPORTED) == 0)
- return (EACCES);
- if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp))
- return (ESTALE);
- if (cred->cr_uid == 0)
- cred->cr_uid = mp->mnt_exroot;
- if (!lockflag)
- VOP_UNLOCK(*vpp);
- return (0);
- }
-
- /*
- * These two functions implement nfs rpc compression.
- * The algorithm is a trivial run length encoding of '\0' bytes. The high
- * order nibble of hex "e" is or'd with the number of zeroes - 2 in four
- * bits. (2 - 17 zeros) Any data byte with a high order nibble of hex "e"
- * is byte stuffed.
- * The compressed data is padded with 0x0 bytes to an even multiple of
- * 4 bytes in length to avoid any weird long pointer alignments.
- * If compression/uncompression is unsuccessful, the original mbuf list
- * is returned.
- * The first four bytes (the XID) are left uncompressed and the fifth
- * byte is set to 0x1 for request and 0x2 for reply.
- * An uncompressed RPC will always have the fifth byte == 0x0.
- */
- struct mbuf *
- nfs_compress(m0)
- struct mbuf *m0;
- {
- register u_char ch, nextch;
- register int i, rlelast;
- register u_char *ip, *op;
- register int ileft, oleft, noteof;
- register struct mbuf *m, *om;
- struct mbuf **mp, *retm;
- int olen, clget;
-
- i = rlelast = 0;
- noteof = 1;
- m = m0;
- if (m->m_len < 12)
- return (m0);
- if (m->m_pkthdr.len >= MINCLSIZE)
- clget = 1;
- else
- clget = 0;
- ileft = m->m_len - 9;
- ip = mtod(m, u_char *);
- MGETHDR(om, M_WAIT, MT_DATA);
- if (clget)
- MCLGET(om, M_WAIT);
- retm = om;
- mp = &om->m_next;
- olen = om->m_len = 5;
- oleft = M_TRAILINGSPACE(om);
- op = mtod(om, u_char *);
- *((u_long *)op) = *((u_long *)ip);
- ip += 7;
- op += 4;
- *op++ = *ip++ + 1;
- nextch = *ip++;
- while (noteof) {
- ch = nextch;
- if (ileft == 0) {
- do {
- m = m->m_next;
- } while (m && m->m_len == 0);
- if (m) {
- ileft = m->m_len;
- ip = mtod(m, u_char *);
- } else {
- noteof = 0;
- nextch = 0x1;
- goto doit;
- }
- }
- nextch = *ip++;
- ileft--;
- doit:
- if (ch == '\0') {
- if (++i == NFSC_MAX || nextch != '\0') {
- if (i < 2) {
- nfscput('\0');
- } else {
- if (rlelast == i) {
- nfscput('\0');
- i--;
- }
- if (NFSCRLE(i) == (nextch & 0xff)) {
- i--;
- if (i < 2) {
- nfscput('\0');
- } else {
- nfscput(NFSCRLE(i));
- }
- nfscput('\0');
- rlelast = 0;
- } else {
- nfscput(NFSCRLE(i));
- rlelast = i;
- }
- }
- i = 0;
- }
- } else {
- if ((ch & NFSCRL) == NFSCRL) {
- nfscput(ch);
- }
- nfscput(ch);
- i = rlelast = 0;
- }
- }
- if (olen < m0->m_pkthdr.len) {
- m_freem(m0);
- if (i = (olen & 0x3)) {
- i = 4 - i;
- while (i-- > 0) {
- nfscput('\0');
- }
- }
- retm->m_pkthdr.len = olen;
- retm->m_pkthdr.rcvif = (struct ifnet *)0;
- return (retm);
- } else {
- m_freem(retm);
- return (m0);
- }
- }
-
- struct mbuf *
- nfs_uncompress(m0)
- struct mbuf *m0;
- {
- register u_char cp, nextcp, *ip, *op;
- register struct mbuf *m, *om;
- struct mbuf *retm, **mp;
- int i, j, noteof, clget, ileft, oleft, olen;
-
- m = m0;
- i = 0;
- while (m && i < MINCLSIZE) {
- i += m->m_len;
- m = m->m_next;
- }
- if (i < 6)
- return (m0);
- if (i >= MINCLSIZE)
- clget = 1;
- else
- clget = 0;
- m = m0;
- MGET(om, M_WAIT, MT_DATA);
- if (clget)
- MCLGET(om, M_WAIT);
- olen = om->m_len = 8;
- oleft = M_TRAILINGSPACE(om);
- op = mtod(om, u_char *);
- retm = om;
- mp = &om->m_next;
- if (m->m_len >= 6) {
- ileft = m->m_len - 6;
- ip = mtod(m, u_char *);
- *((u_long *)op) = *((u_long *)ip);
- bzero(op + 4, 3);
- ip += 4;
- op += 7;
- if (*ip == '\0') {
- m_freem(om);
- return (m0);
- }
- *op++ = *ip++ - 1;
- cp = *ip++;
- } else {
- ileft = m->m_len;
- ip = mtod(m, u_char *);
- nfscget(*op++);
- nfscget(*op++);
- nfscget(*op++);
- nfscget(*op++);
- bzero(op, 3);
- op += 3;
- nfscget(*op);
- if (*op == '\0') {
- m_freem(om);
- return (m0);
- }
- (*op)--;
- op++;
- nfscget(cp);
- }
- noteof = 1;
- while (noteof) {
- if ((cp & NFSCRL) == NFSCRL) {
- nfscget(nextcp);
- if (cp == nextcp) {
- nfscput(cp);
- goto readit;
- } else {
- i = (cp & 0xf) + 2;
- for (j = 0; j < i; j++) {
- nfscput('\0');
- }
- cp = nextcp;
- }
- } else {
- nfscput(cp);
- readit:
- nfscget(cp);
- }
- }
- m_freem(m0);
- if (i = (olen & 0x3))
- om->m_len -= i;
- return (retm);
- }
-