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freebsd-skq/sys/nfsclient/nfs_subs.c
dyson 20f29bf525 Slight re-ordering of the creation of a vmio object to fix a condition 
that can cause NFS I/O failures.
1995-04-21 02:58:49 +00:00

1228 lines
29 KiB
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_subs.c 8.3 (Berkeley) 1/4/94
* $Id: nfs_subs.c,v 1.12 1995/03/16 18:15:39 bde Exp $
*/
/*
* 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 <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifdef VFS_LKM
#include <sys/sysent.h>
#include <sys/syscall.h>
#endif
#include <vm/vm.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>
#include <nfs/nfsrtt.h>
#include <miscfs/specfs/specdev.h>
#include <vm/vnode_pager.h>
#include <netinet/in.h>
#ifdef ISO
#include <netiso/iso.h>
#endif
#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_autherr,
rpc_mismatch, rpc_auth_unix, rpc_msgaccepted, rpc_rejectedcred,
rpc_auth_kerb;
u_long nfs_vers, nfs_prog, nfs_true, nfs_false;
/* And other global data */
static u_long nfs_xid = 0;
enum vtype ntov_type[7] = { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON };
extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
extern int nqnfs_piggy[NFS_NPROCS];
extern struct nfsrtt nfsrtt;
extern time_t nqnfsstarttime;
extern u_long nqnfs_prog, nqnfs_vers;
extern int nqsrv_clockskew;
extern int nqsrv_writeslack;
extern int nqsrv_maxlease;
#ifdef VFS_LKM
struct getfh_args;
extern int getfh(struct proc *, struct getfh_args *, int *);
struct nfssvc_args;
extern int nfssvc(struct proc *, struct nfssvc_args *, int *);
#endif
LIST_HEAD(nfsnodehashhead, nfsnode);
/*
* Create the header for an rpc request packet
* The hsiz is the size of the rest of the nfs request header.
* (just used to decide if a cluster is a good idea)
*/
struct mbuf *
nfsm_reqh(vp, procid, hsiz, bposp)
struct vnode *vp;
u_long procid;
int hsiz;
caddr_t *bposp;
{
register struct mbuf *mb;
register u_long *tl;
register caddr_t bpos;
struct mbuf *mb2;
struct nfsmount *nmp;
int nqflag;
MGET(mb, M_WAIT, MT_DATA);
if (hsiz >= MINCLSIZE)
MCLGET(mb, M_WAIT);
mb->m_len = 0;
bpos = mtod(mb, caddr_t);
/*
* For NQNFS, add lease request.
*/
if (vp) {
nmp = VFSTONFS(vp->v_mount);
if (nmp->nm_flag & NFSMNT_NQNFS) {
nqflag = NQNFS_NEEDLEASE(vp, procid);
if (nqflag) {
nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(nqflag);
*tl = txdr_unsigned(nmp->nm_leaseterm);
} else {
nfsm_build(tl, u_long *, NFSX_UNSIGNED);
*tl = 0;
}
}
}
/* Finally, return values */
*bposp = bpos;
return (mb);
}
/*
* Build the RPC header and fill in the authorization info.
* The authorization string argument is only used when the credentials
* come from outside of the kernel.
* Returns the head of the mbuf list.
*/
struct mbuf *
nfsm_rpchead(cr, nqnfs, procid, auth_type, auth_len, auth_str, mrest,
mrest_len, mbp, xidp)
register struct ucred *cr;
int nqnfs;
int procid;
int auth_type;
int auth_len;
char *auth_str;
struct mbuf *mrest;
int mrest_len;
struct mbuf **mbp;
u_long *xidp;
{
register struct mbuf *mb;
register u_long *tl;
register caddr_t bpos;
register int i;
struct mbuf *mreq, *mb2;
int siz, grpsiz, authsiz;
authsiz = nfsm_rndup(auth_len);
if (auth_type == RPCAUTH_NQNFS)
authsiz += 2 * NFSX_UNSIGNED;
MGETHDR(mb, M_WAIT, MT_DATA);
if ((authsiz + 10*NFSX_UNSIGNED) >= MINCLSIZE) {
MCLGET(mb, M_WAIT);
} else if ((authsiz + 10*NFSX_UNSIGNED) < MHLEN) {
MH_ALIGN(mb, authsiz + 10*NFSX_UNSIGNED);
} else {
MH_ALIGN(mb, 8*NFSX_UNSIGNED);
}
mb->m_len = 0;
mreq = mb;
bpos = mtod(mb, caddr_t);
/*
* First the RPC header.
*/
nfsm_build(tl, u_long *, 8*NFSX_UNSIGNED);
if (++nfs_xid == 0)
nfs_xid++;
*tl++ = *xidp = txdr_unsigned(nfs_xid);
*tl++ = rpc_call;
*tl++ = rpc_vers;
if (nqnfs) {
*tl++ = txdr_unsigned(NQNFS_PROG);
*tl++ = txdr_unsigned(NQNFS_VER1);
} else {
*tl++ = txdr_unsigned(NFS_PROG);
*tl++ = txdr_unsigned(NFS_VER2);
}
*tl++ = txdr_unsigned(procid);
/*
* And then the authorization cred.
*/
*tl++ = txdr_unsigned(auth_type);
*tl = txdr_unsigned(authsiz);
switch (auth_type) {
case RPCAUTH_UNIX:
nfsm_build(tl, u_long *, auth_len);
*tl++ = 0; /* stamp ?? */
*tl++ = 0; /* NULL hostname */
*tl++ = txdr_unsigned(cr->cr_uid);
*tl++ = txdr_unsigned(cr->cr_groups[0]);
grpsiz = (auth_len >> 2) - 5;
*tl++ = txdr_unsigned(grpsiz);
for (i = 1; i <= grpsiz; i++)
*tl++ = txdr_unsigned(cr->cr_groups[i]);
break;
case RPCAUTH_NQNFS:
nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(cr->cr_uid);
*tl = txdr_unsigned(auth_len);
siz = auth_len;
while (siz > 0) {
if (M_TRAILINGSPACE(mb) == 0) {
MGET(mb2, M_WAIT, MT_DATA);
if (siz >= MINCLSIZE)
MCLGET(mb2, M_WAIT);
mb->m_next = mb2;
mb = mb2;
mb->m_len = 0;
bpos = mtod(mb, caddr_t);
}
i = min(siz, M_TRAILINGSPACE(mb));
bcopy(auth_str, bpos, i);
mb->m_len += i;
auth_str += i;
bpos += i;
siz -= i;
}
if ((siz = (nfsm_rndup(auth_len) - auth_len)) > 0) {
for (i = 0; i < siz; i++)
*bpos++ = '\0';
mb->m_len += siz;
}
break;
};
nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(RPCAUTH_NULL);
*tl = 0;
mb->m_next = mrest;
mreq->m_pkthdr.len = authsiz + 10*NFSX_UNSIGNED + mrest_len;
mreq->m_pkthdr.rcvif = (struct ifnet *)0;
*mbp = mb;
return (mreq);
}
/*
* copies mbuf chain to the uio scatter/gather list
*/
int
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...
*/
int
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, mlen;
int uiosiz, clflg, rem;
char *cp;
if (siz > MLEN) /* or should it >= MCLBYTES ?? */
clflg = 1;
else
clflg = 0;
rem = nfsm_rndup(siz)-siz;
mp = 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) {
mlen = M_TRAILINGSPACE(mp);
if (mlen == 0) {
MGET(mp, M_WAIT, MT_DATA);
if (clflg)
MCLGET(mp, M_WAIT);
mp->m_len = 0;
mp2->m_next = mp;
mp2 = mp;
mlen = M_TRAILINGSPACE(mp);
}
xfer = (left > mlen) ? mlen : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
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 > M_TRAILINGSPACE(mp)) {
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.
* This is used by the macros nfsm_dissect and nfsm_dissecton for tough
* cases. (The macros use the vars. dpos and dpos2)
*/
int
nfsm_disct(mdp, dposp, siz, left, cp2)
struct mbuf **mdp;
caddr_t *dposp;
int siz;
int left;
caddr_t *cp2;
{
register struct mbuf *mp, *mp2;
register int siz2, xfer;
register caddr_t p;
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 {
MGET(mp2, M_WAIT, MT_DATA);
mp2->m_next = mp->m_next;
mp->m_next = mp2;
mp->m_len -= left;
mp = mp2;
*cp2 = p = mtod(mp, caddr_t);
bcopy(*dposp, p, left); /* Copy what was left */
siz2 = siz-left;
p += 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), p, xfer);
NFSMADV(mp2, xfer);
mp2->m_len -= xfer;
p += 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.
*/
int
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...
*/
int
nfsm_strtmbuf(mb, bpos, cp, siz)
struct mbuf **mb;
char **bpos;
char *cp;
long siz;
{
register struct mbuf *m1 = 0, *m2;
long left, xfer, len, tlen;
u_long *tl;
int putsize;
putsize = 1;
m2 = *mb;
left = M_TRAILINGSPACE(m2);
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 around 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...
*/
int
nfs_init()
{
register int i;
nfsrtt.pos = 0;
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_autherr = txdr_unsigned(RPC_AUTHERR);
rpc_rejectedcred = txdr_unsigned(AUTH_REJECTCRED);
rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
rpc_auth_kerb = txdr_unsigned(RPCAUTH_NQNFS);
nfs_vers = txdr_unsigned(NFS_VER2);
nfs_prog = txdr_unsigned(NFS_PROG);
nfs_true = txdr_unsigned(TRUE);
nfs_false = txdr_unsigned(FALSE);
nfs_xdrneg1 = txdr_unsigned(-1);
/* 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;
TAILQ_INIT(&nfs_bufq);
nfs_nhinit(); /* Init the nfsnode table */
nfsrv_init(0); /* Init server data structures */
nfsrv_initcache(); /* Init the server request cache */
/*
* Initialize the nqnfs server stuff.
*/
if (nqnfsstarttime == 0) {
nqnfsstarttime = boottime.tv_sec + nqsrv_maxlease
+ nqsrv_clockskew + nqsrv_writeslack;
NQLOADNOVRAM(nqnfsstarttime);
nqnfs_prog = txdr_unsigned(NQNFS_PROG);
nqnfs_vers = txdr_unsigned(NQNFS_VER1);
CIRCLEQ_INIT(&nqtimerhead);
nqfhhashtbl = hashinit(NQLCHSZ, M_NQLEASE, &nqfhhash);
}
/*
* Initialize reply list and start timer
*/
TAILQ_INIT(&nfs_reqq);
nfs_timer(0);
/*
* Set up lease_check and lease_updatetime so that other parts
* of the system can call us, if we are loadable.
*/
lease_check = nfs_lease_check;
lease_updatetime = nfs_lease_updatetime;
vfsconf[MOUNT_NFS]->vfc_refcount++; /* make us non-unloadable */
#ifdef VFS_LKM
sysent[SYS_nfssvc].sy_narg = 2;
sysent[SYS_nfssvc].sy_call = nfssvc;
sysent[SYS_getfh].sy_narg = 2;
sysent[SYS_getfh].sy_call = getfh;
#endif
return (0);
}
/*
* 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
*/
int
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;
register struct nfsnode *np;
register struct nfsnodehashhead *nhpp;
register long t1;
caddr_t dpos, cp2;
int error = 0, isnq;
struct mbuf *md;
enum vtype vtyp;
u_short vmode;
long rdev;
struct timespec mtime;
struct vnode *nvp;
md = *mdp;
dpos = *dposp;
t1 = (mtod(md, caddr_t) + md->m_len) - dpos;
isnq = (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS);
error = nfsm_disct(&md, &dpos, NFSX_FATTR(isnq), t1, &cp2);
if (error)
return (error);
fp = (struct nfsv2_fattr *)cp2;
vtyp = nfstov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
if (vtyp == VNON || vtyp == VREG)
vtyp = IFTOVT(vmode);
if (isnq) {
rdev = fxdr_unsigned(long, fp->fa_nqrdev);
fxdr_nqtime(&fp->fa_nqmtime, &mtime);
} else {
rdev = fxdr_unsigned(long, fp->fa_nfsrdev);
fxdr_nfstime(&fp->fa_nfsmtime, &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 (vtyp == VCHR && rdev == 0xffffffff)
vp->v_type = vtyp = VFIFO;
else
vp->v_type = vtyp;
if (vp->v_type == VFIFO) {
vp->v_op = fifo_nfsv2nodeop_p;
}
if (vp->v_type == VCHR || vp->v_type == VBLK) {
vp->v_op = spec_nfsv2nodeop_p;
nvp = checkalias(vp, (dev_t)rdev, vp->v_mount);
if (nvp) {
/*
* Discard unneeded vnode, but save its nfsnode.
*/
LIST_REMOVE(np, n_hash);
nvp->v_data = vp->v_data;
vp->v_data = NULL;
vp->v_op = spec_vnodeop_p;
vrele(vp);
vgone(vp);
/*
* Reinitialize aliased node.
*/
np->n_vnode = nvp;
nhpp = nfs_hash(&np->n_fh);
LIST_INSERT_HEAD(nhpp, np, n_hash);
*vpp = vp = nvp;
}
}
np->n_mtime = mtime.ts_sec;
}
vap = &np->n_vattr;
vap->va_type = vtyp;
vap->va_mode = (vmode & 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_rdev = (dev_t)rdev;
vap->va_mtime = mtime;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
if (isnq) {
fxdr_hyper(&fp->fa_nqsize, &vap->va_size);
vap->va_blocksize = fxdr_unsigned(long, fp->fa_nqblocksize);
fxdr_hyper(&fp->fa_nqbytes, &vap->va_bytes);
vap->va_fileid = fxdr_unsigned(long, fp->fa_nqfileid);
fxdr_nqtime(&fp->fa_nqatime, &vap->va_atime);
vap->va_flags = fxdr_unsigned(u_long, fp->fa_nqflags);
fxdr_nqtime(&fp->fa_nqctime, &vap->va_ctime);
vap->va_gen = fxdr_unsigned(u_long, fp->fa_nqgen);
fxdr_hyper(&fp->fa_nqfilerev, &vap->va_filerev);
} else {
vap->va_size = fxdr_unsigned(u_long, fp->fa_nfssize);
vap->va_blocksize = fxdr_unsigned(long, fp->fa_nfsblocksize);
vap->va_bytes = fxdr_unsigned(long, fp->fa_nfsblocks) * NFS_FABLKSIZE;
vap->va_fileid = fxdr_unsigned(long, fp->fa_nfsfileid);
fxdr_nfstime(&fp->fa_nfsatime, &vap->va_atime);
vap->va_flags = 0;
fxdr_nfstime(&fp->fa_nfsctime, &vap->va_ctime);
vap->va_gen = 0;
vap->va_filerev = 0;
}
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (np->n_flag & NMODIFIED) {
if (vap->va_size < np->n_size)
vap->va_size = np->n_size;
else
np->n_size = vap->va_size;
} else
np->n_size = vap->va_size;
vnode_pager_setsize(vp, (u_long)np->n_size);
} else
np->n_size = vap->va_size;
}
np->n_attrstamp = time.tv_sec;
*dposp = dpos;
*mdp = md;
if (vaper != NULL) {
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
#ifdef notdef
if ((np->n_flag & NMODIFIED) && np->n_size > vap->va_size)
if (np->n_size > vap->va_size)
vaper->va_size = np->n_size;
#endif
if (np->n_flag & NCHG) {
if (np->n_flag & NACC) {
vaper->va_atime.ts_sec = np->n_atim.tv_sec;
vaper->va_atime.ts_nsec =
np->n_atim.tv_usec * 1000;
}
if (np->n_flag & NUPD) {
vaper->va_mtime.ts_sec = np->n_mtim.tv_sec;
vaper->va_mtime.ts_nsec =
np->n_mtim.tv_usec * 1000;
}
}
}
return (0);
}
/*
* Check the time stamp
* If the cache is valid, copy contents to *vap and return 0
* otherwise return an error
*/
int
nfs_getattrcache(vp, vaper)
register struct vnode *vp;
struct vattr *vaper;
{
register struct nfsnode *np = VTONFS(vp);
register struct vattr *vap;
if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQLOOKLEASE) {
if (!NQNFS_CKCACHABLE(vp, NQL_READ) || np->n_attrstamp == 0) {
nfsstats.attrcache_misses++;
return (ENOENT);
}
} else if ((time.tv_sec - np->n_attrstamp) >= NFS_ATTRTIMEO(np)) {
nfsstats.attrcache_misses++;
return (ENOENT);
}
nfsstats.attrcache_hits++;
vap = &np->n_vattr;
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (np->n_flag & NMODIFIED) {
if (vap->va_size < np->n_size)
vap->va_size = np->n_size;
else
np->n_size = vap->va_size;
} else
np->n_size = vap->va_size;
vnode_pager_setsize(vp, (u_long)np->n_size);
} else
np->n_size = vap->va_size;
}
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
#ifdef notdef
if ((np->n_flag & NMODIFIED) == 0) {
np->n_size = vaper->va_size;
vnode_pager_setsize(vp, (u_long)np->n_size);
} else if (np->n_size > vaper->va_size)
if (np->n_size > vaper->va_size)
vaper->va_size = np->n_size;
#endif
if (np->n_flag & NCHG) {
if (np->n_flag & NACC) {
vaper->va_atime.ts_sec = np->n_atim.tv_sec;
vaper->va_atime.ts_nsec = np->n_atim.tv_usec * 1000;
}
if (np->n_flag & NUPD) {
vaper->va_mtime.ts_sec = np->n_mtim.tv_sec;
vaper->va_mtime.ts_nsec = np->n_mtim.tv_usec * 1000;
}
}
return (0);
}
/*
* Set up nameidata for a lookup() call and do it
*/
int
nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, p)
register struct nameidata *ndp;
fhandle_t *fhp;
int len;
struct nfssvc_sock *slp;
struct mbuf *nam;
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 error, rdonly;
struct componentname *cnp = &ndp->ni_cnd;
MALLOC(cnp->cn_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 = cnp->cn_pnbuf;
md = *mdp;
rem = mtod(md, caddr_t) + md->m_len - fromcp;
cnp->cn_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;
}
cnp->cn_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 {
error = nfs_adv(mdp, dposp, len, rem);
if (error)
goto out;
}
}
ndp->ni_pathlen = tocp - cnp->cn_pnbuf;
cnp->cn_nameptr = cnp->cn_pnbuf;
/*
* Extract and set starting directory.
*/
error = nfsrv_fhtovp(fhp, FALSE, &dp, ndp->ni_cnd.cn_cred, slp,
nam, &rdonly);
if (error)
goto out;
if (dp->v_type != VDIR) {
nfsrv_vrele(dp);
error = ENOTDIR;
goto out;
}
ndp->ni_startdir = dp;
if (rdonly)
cnp->cn_flags |= (NOCROSSMOUNT | RDONLY);
else
cnp->cn_flags |= NOCROSSMOUNT;
/*
* And call lookup() to do the real work
*/
cnp->cn_proc = p;
error = lookup(ndp);
if (error)
goto out;
/*
* Check for encountering a symbolic link
*/
if (cnp->cn_flags & ISSYMLINK) {
if ((cnp->cn_flags & 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 (cnp->cn_flags & (SAVENAME | SAVESTART)) {
cnp->cn_flags |= HASBUF;
nfsrv_vmio( ndp->ni_vp);
return (0);
}
out:
FREE(cnp->cn_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
*/
void
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;
}
for (m = m->m_next;m;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)
* - get vp and export rights by calling VFS_FHTOVP()
* - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
* - if not lockflag unlock it with VOP_UNLOCK()
*/
int
nfsrv_fhtovp(fhp, lockflag, vpp, cred, slp, nam, rdonlyp)
fhandle_t *fhp;
int lockflag;
struct vnode **vpp;
struct ucred *cred;
struct nfssvc_sock *slp;
struct mbuf *nam;
int *rdonlyp;
{
register struct mount *mp;
register struct nfsuid *uidp;
register int i;
struct ucred *credanon;
int error, exflags;
*vpp = (struct vnode *)0;
mp = getvfs(&fhp->fh_fsid);
if (!mp)
return (ESTALE);
error = VFS_FHTOVP(mp, &fhp->fh_fid, nam, vpp, &exflags, &credanon);
if (error)
return (error);
/*
* Check/setup credentials.
*/
if (exflags & MNT_EXKERB) {
for (uidp = NUIDHASH(slp, cred->cr_uid)->lh_first; uidp != 0;
uidp = uidp->nu_hash.le_next) {
if (uidp->nu_uid == cred->cr_uid)
break;
}
if (uidp == 0) {
vput(*vpp);
return (NQNFS_AUTHERR);
}
cred->cr_uid = uidp->nu_cr.cr_uid;
for (i = 0; i < uidp->nu_cr.cr_ngroups; i++)
cred->cr_groups[i] = uidp->nu_cr.cr_groups[i];
cred->cr_ngroups = i;
} else if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
cred->cr_uid = credanon->cr_uid;
for (i = 0; i < credanon->cr_ngroups && i < NGROUPS; i++)
cred->cr_groups[i] = credanon->cr_groups[i];
cred->cr_ngroups = i;
}
if (exflags & MNT_EXRDONLY)
*rdonlyp = 1;
else
*rdonlyp = 0;
nfsrv_vmio(*vpp);
if (!lockflag)
VOP_UNLOCK(*vpp);
return (0);
}
/*
* This function compares two net addresses by family and returns TRUE
* if they are the same host.
* If there is any doubt, return FALSE.
* The AF_INET family is handled as a special case so that address mbufs
* don't need to be saved to store "struct in_addr", which is only 4 bytes.
*/
int
netaddr_match(family, haddr, nam)
int family;
union nethostaddr *haddr;
struct mbuf *nam;
{
register struct sockaddr_in *inetaddr;
switch (family) {
case AF_INET:
inetaddr = mtod(nam, struct sockaddr_in *);
if (inetaddr->sin_family == AF_INET &&
inetaddr->sin_addr.s_addr == haddr->had_inetaddr)
return (1);
break;
#ifdef ISO
case AF_ISO:
{
register struct sockaddr_iso *isoaddr1, *isoaddr2;
isoaddr1 = mtod(nam, struct sockaddr_iso *);
isoaddr2 = mtod(haddr->had_nam, struct sockaddr_iso *);
if (isoaddr1->siso_family == AF_ISO &&
isoaddr1->siso_nlen > 0 &&
isoaddr1->siso_nlen == isoaddr2->siso_nlen &&
SAME_ISOADDR(isoaddr1, isoaddr2))
return (1);
break;
}
#endif /* ISO */
default:
break;
};
return (0);
}
int
nfsrv_vmio( struct vnode *vp) {
vm_object_t object;
vm_pager_t pager;
if( (vp == NULL) || (vp->v_type != VREG))
return 1;
retry:
if( (vp->v_flag & VVMIO) == 0) {
pager = (vm_pager_t) vnode_pager_alloc((caddr_t) vp, 0, 0, 0);
object = (vm_object_t) vp->v_vmdata;
if( object->pager != pager)
panic("nfsrv_vmio: pager/object mismatch");
(void) vm_object_lookup( pager);
pager_cache( object, TRUE);
vp->v_flag |= VVMIO;
} else {
if( (object = (vm_object_t)vp->v_vmdata) &&
(object->flags & OBJ_DEAD)) {
tsleep( (caddr_t) object, PVM, "nfdead", 0);
goto retry;
}
if( !object)
panic("nfsrv_vmio: VMIO object missing");
pager = object->pager;
if( !pager)
panic("nfsrv_vmio: VMIO pager missing");
(void) vm_object_lookup( pager);
}
return 0;
}
int
nfsrv_vput( struct vnode *vp) {
if( (vp->v_flag & VVMIO) && vp->v_vmdata) {
vput( vp);
vm_object_deallocate( (vm_object_t) vp->v_vmdata);
} else {
vput( vp);
}
return 0;
}
int
nfsrv_vrele( struct vnode *vp) {
if( (vp->v_flag & VVMIO) && vp->v_vmdata) {
vrele( vp);
vm_object_deallocate( (vm_object_t) vp->v_vmdata);
} else {
vrele( vp);
}
return 0;
}
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