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77f53bcf27
freebsd-skq/sys/nfsclient/nfs_subs.c
David Greenman 77f53bcf27 Fixed some serious bugs that resulted in object reference counts not being 
handled correctly. This would manifest itself as "object deallocated too
many times" panics and perhaps other strange inconsistencies on NFS servers.

Reviewed by:	me, of course
Submitted by:	John Dyson
1995-05-29 04:01:09 +00:00

1230 lines
29 KiB
C
Raw Blame History

/*
* 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 1.13 1995/04/21 02:58:49 dyson 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;
}
nfsrv_vmio(ndp->ni_vp);
/*
* Check for saved name request
*/
if (cnp->cn_flags & (SAVENAME | SAVESTART)) {
cnp->cn_flags |= HASBUF;
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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