File: [cvs.NetBSD.org] / src / sys / nfs / nfs_serv.c (download)
Revision 1.7, Fri Sep 3 23:57:25 1993 UTC (30 years, 7 months ago) by jtc
Branch: MAIN
Changes since 1.6: +2 -1
lines
Include systm.h to get prototypes (and possibly inlines) of *max functions.
|
/*
* 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.
*
* from: @(#)nfs_serv.c 7.40 (Berkeley) 5/15/91
* $Id: nfs_serv.c,v 1.7 1993/09/03 23:57:25 jtc Exp $
*/
/*
* nfs version 2 server calls to vnode ops
* - these routines generally have 3 phases
* 1 - break down and validate rpc request in mbuf list
* 2 - do the vnode ops for the request
* (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c)
* 3 - build the rpc reply in an mbuf list
* nb:
* - do not mix the phases, since the nfsm_?? macros can return failures
* on a bad rpc or similar and do not do any vrele() or vput()'s
*
* - the nfsm_reply() macro generates an nfs rpc reply with the nfs
* error number iff error != 0 whereas
* returning an error from the server function implies a fatal error
* such as a badly constructed rpc request that should be dropped without
* a reply.
*/
#include "param.h"
#include "systm.h"
#include "proc.h"
#include "file.h"
#include "namei.h"
#include "vnode.h"
#include "mount.h"
#include "mbuf.h"
#include "../ufs/quota.h"
#include "../ufs/inode.h"
#include "../ufs/dir.h"
#include "nfsv2.h"
#include "nfs.h"
#include "xdr_subs.h"
#include "nfsm_subs.h"
/* Defs */
#define TRUE 1
#define FALSE 0
/* Global vars */
extern u_long nfs_procids[NFS_NPROCS];
extern u_long nfs_xdrneg1;
extern u_long nfs_false, nfs_true;
nfstype nfs_type[9]={ NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON,
NFCHR, NFNON };
int nfsrv_null(),
nfsrv_getattr(),
nfsrv_setattr(),
nfsrv_lookup(),
nfsrv_readlink(),
nfsrv_read(),
nfsrv_write(),
nfsrv_create(),
nfsrv_remove(),
nfsrv_rename(),
nfsrv_link(),
nfsrv_symlink(),
nfsrv_mkdir(),
nfsrv_rmdir(),
nfsrv_readdir(),
nfsrv_statfs(),
nfsrv_noop();
int (*nfsrv_procs[NFS_NPROCS])() = {
nfsrv_null,
nfsrv_getattr,
nfsrv_setattr,
nfsrv_noop,
nfsrv_lookup,
nfsrv_readlink,
nfsrv_read,
nfsrv_noop,
nfsrv_write,
nfsrv_create,
nfsrv_remove,
nfsrv_rename,
nfsrv_link,
nfsrv_symlink,
nfsrv_mkdir,
nfsrv_rmdir,
nfsrv_readdir,
nfsrv_statfs,
};
/*
* nfs getattr service
*/
nfsrv_getattr(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct nfsv2_fattr *fp;
struct vattr va;
register struct vattr *vap = &va;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
error = VOP_GETATTR(vp, vap, cred, p);
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs setattr service
*/
nfsrv_setattr(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct vattr va;
register struct vattr *vap = &va;
register struct nfsv2_sattr *sp;
register struct nfsv2_fattr *fp;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(sp, struct nfsv2_sattr *, NFSX_SATTR);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VWRITE, cred, p))
goto out;
VATTR_NULL(vap);
/*
* Nah nah nah nah na nah
* There is a bug in the Sun client that puts 0xffff in the mode
* field of sattr when it should put in 0xffffffff. The u_short
* doesn't sign extend.
* --> check the low order 2 bytes for 0xffff
*/
if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
vap->va_mode = nfstov_mode(sp->sa_mode);
if (sp->sa_uid != nfs_xdrneg1)
vap->va_uid = fxdr_unsigned(uid_t, sp->sa_uid);
if (sp->sa_gid != nfs_xdrneg1)
vap->va_gid = fxdr_unsigned(gid_t, sp->sa_gid);
if (sp->sa_size != nfs_xdrneg1)
vap->va_size = fxdr_unsigned(u_long, sp->sa_size);
/*
* The usec field of sa_atime is overloaded with the va_flags field
* for 4.4BSD clients. Hopefully other clients always set both the
* sec and usec fields to -1 when not setting the atime.
*
* jfw@ksr.com (6/2/93): Suns certainly don't set the usec field to
* -1 when *setting* the atime, resulting in
* va_flags acquiring random contents.
*/
#if 0 /* bad assumption, NFS is too fragile to extend. */
if (sp->sa_atime.tv_sec != nfs_xdrneg1) {
vap->va_atime.tv_sec = fxdr_unsigned(long, sp->sa_atime.tv_sec);
vap->va_atime.tv_usec = 0;
}
if (sp->sa_atime.tv_usec != nfs_xdrneg1)
vap->va_flags = fxdr_unsigned(u_long, sp->sa_atime.tv_usec);
#else
if (sp->sa_atime.tv_sec != nfs_xdrneg1)
fxdr_time(&sp->sa_atime, &vap->va_atime);
#endif
if (sp->sa_mtime.tv_sec != nfs_xdrneg1)
fxdr_time(&sp->sa_mtime, &vap->va_mtime);
if (error = VOP_SETATTR(vp, vap, cred, p)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred, p);
out:
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs lookup rpc
*/
nfsrv_lookup(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct nfsv2_fattr *fp;
struct nameidata nd;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register caddr_t cp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
long len;
struct vattr va, *vap = &va;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = LOOKUP | LOCKLEAF;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
nfsm_reply(0);
vp = nd.ni_vp;
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred, p);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs readlink service
*/
nfsrv_readlink(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
register struct iovec *ivp = iv;
register struct mbuf *mp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mp2, *mp3, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
int i, tlen, len;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
len = 0;
i = 0;
while (len < NFS_MAXPATHLEN) {
MGET(mp, M_WAIT, MT_DATA);
MCLGET(mp, M_WAIT);
mp->m_len = NFSMSIZ(mp);
if (len == 0)
mp3 = mp2 = mp;
else {
mp2->m_next = mp;
mp2 = mp;
}
if ((len+mp->m_len) > NFS_MAXPATHLEN) {
mp->m_len = NFS_MAXPATHLEN-len;
len = NFS_MAXPATHLEN;
} else
len += mp->m_len;
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
i++;
ivp++;
}
uiop->uio_iov = iv;
uiop->uio_iovcnt = i;
uiop->uio_offset = 0;
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_procp = (struct proc *)0;
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred)) {
m_freem(mp3);
nfsm_reply(0);
}
if (vp->v_type != VLNK) {
error = EINVAL;
goto out;
}
error = VOP_READLINK(vp, uiop, cred);
out:
vput(vp);
if (error)
m_freem(mp3);
nfsm_reply(NFSX_UNSIGNED);
if (uiop->uio_resid > 0) {
len -= uiop->uio_resid;
tlen = nfsm_rndup(len);
nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len);
}
nfsm_build(tl, u_long *, NFSX_UNSIGNED);
*tl = txdr_unsigned(len);
mb->m_next = mp3;
nfsm_srvdone;
}
/*
* nfs read service
*/
nfsrv_read(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct iovec *iv;
struct iovec *iv2;
register struct mbuf *m;
register struct nfsv2_fattr *fp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct mbuf *m2, *m3;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
struct vattr va, *vap = &va;
int i, cnt, len, left, siz, tlen;
off_t off;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(tl, u_long *, NFSX_UNSIGNED);
off = fxdr_unsigned(off_t, *tl);
nfsm_srvstrsiz(cnt, NFS_MAXDATA);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if ((error = nfsrv_access(vp, VREAD, cred, p)) &&
(error = nfsrv_access(vp, VEXEC, cred, p))) {
vput(vp);
nfsm_reply(0);
}
len = left = cnt;
/*
* Generate the mbuf list with the uio_iov ref. to it.
*/
i = 0;
m3 = (struct mbuf *)0;
#ifdef lint
m2 = (struct mbuf *)0;
#endif /* lint */
MALLOC(iv, struct iovec *,
((NFS_MAXDATA+MLEN-1)/MLEN) * sizeof (struct iovec), M_TEMP,
M_WAITOK);
iv2 = iv;
while (left > 0) {
MGET(m, M_WAIT, MT_DATA);
if (left > MINCLSIZE)
MCLGET(m, M_WAIT);
m->m_len = 0;
siz = min(M_TRAILINGSPACE(m), left);
m->m_len = siz;
iv->iov_base = mtod(m, caddr_t);
iv->iov_len = siz;
iv++;
i++;
left -= siz;
if (m3) {
m2->m_next = m;
m2 = m;
} else
m3 = m2 = m;
}
uiop->uio_iov = iv2;
uiop->uio_iovcnt = i;
uiop->uio_offset = off;
uiop->uio_resid = cnt;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_procp = (struct proc *)0;
error = VOP_READ(vp, uiop, IO_NODELOCKED, cred);
off = uiop->uio_offset;
FREE((caddr_t)iv2, M_TEMP);
if (error) {
m_freem(m3);
vput(vp);
nfsm_reply(0);
}
if (error = VOP_GETATTR(vp, vap, cred, p))
m_freem(m3);
vput(vp);
nfsm_reply(NFSX_FATTR+NFSX_UNSIGNED);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
len -= uiop->uio_resid;
if (len > 0) {
tlen = nfsm_rndup(len);
if (cnt != tlen || tlen != len)
nfsm_adj(m3, cnt-tlen, tlen-len);
} else {
m_freem(m3);
m3 = (struct mbuf *)0;
}
nfsm_build(tl, u_long *, NFSX_UNSIGNED);
*tl = txdr_unsigned(len);
mb->m_next = m3;
nfsm_srvdone;
}
/*
* nfs write service
*/
nfsrv_write(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct iovec *ivp;
register struct mbuf *mp;
register struct nfsv2_fattr *fp;
struct iovec iv[NFS_MAXIOVEC];
struct vattr va;
register struct vattr *vap = &va;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
off_t off;
long siz, len, xfer;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(tl, u_long *, 4*NFSX_UNSIGNED);
off = fxdr_unsigned(off_t, *++tl);
tl += 2;
len = fxdr_unsigned(long, *tl);
if (len > NFS_MAXDATA || len <= 0) {
error = EBADRPC;
nfsm_reply(0);
}
if (dpos == (mtod(md, caddr_t)+md->m_len)) {
mp = md->m_next;
if (mp == NULL) {
error = EBADRPC;
nfsm_reply(0);
}
} else {
mp = md;
siz = dpos-mtod(mp, caddr_t);
mp->m_len -= siz;
NFSMADV(mp, siz);
}
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VWRITE, cred, p)) {
vput(vp);
nfsm_reply(0);
}
uiop->uio_resid = 0;
uiop->uio_rw = UIO_WRITE;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_procp = (struct proc *)0;
/*
* Do up to NFS_MAXIOVEC mbufs of write each iteration of the
* loop until done.
*/
while (len > 0 && uiop->uio_resid == 0) {
ivp = iv;
siz = 0;
uiop->uio_iov = ivp;
uiop->uio_iovcnt = 0;
uiop->uio_offset = off;
while (len > 0 && uiop->uio_iovcnt < NFS_MAXIOVEC && mp != NULL) {
ivp->iov_base = mtod(mp, caddr_t);
if (len < mp->m_len)
ivp->iov_len = xfer = len;
else
ivp->iov_len = xfer = mp->m_len;
#ifdef notdef
/* Not Yet .. */
if (M_HASCL(mp) && (((u_long)ivp->iov_base) & CLOFSET) == 0)
ivp->iov_op = NULL; /* what should it be ?? */
else
ivp->iov_op = NULL;
#endif
uiop->uio_iovcnt++;
ivp++;
len -= xfer;
siz += xfer;
mp = mp->m_next;
}
if (len > 0 && mp == NULL) {
error = EBADRPC;
vput(vp);
nfsm_reply(0);
}
uiop->uio_resid = siz;
if (error = VOP_WRITE(vp, uiop, IO_SYNC | IO_NODELOCKED,
cred)) {
vput(vp);
nfsm_reply(0);
}
off = uiop->uio_offset;
}
error = VOP_GETATTR(vp, vap, cred, p);
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs create service
* if it already exists, just set length * 28 Aug 92*
* do NOT truncate unconditionally !
*/
nfsrv_create(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct nfsv2_fattr *fp;
struct vattr va;
register struct vattr *vap = &va;
struct nameidata nd;
register caddr_t cp;
register u_long *tl;
register long t1;
caddr_t bpos;
long rdev;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
nd.ni_nameiop = 0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF | SAVESTART;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
nfsm_reply(0);
VATTR_NULL(vap);
nfsm_disect(tl, u_long *, NFSX_SATTR);
/*
* If it doesn't exist, create it * 28 Aug 92*
* otherwise just set length from attributes
* should I set the mode too ??
*/
if (nd.ni_vp == NULL) {
vap->va_type = IFTOVT(fxdr_unsigned(u_long, *tl));
if (vap->va_type == VNON)
vap->va_type = VREG;
vap->va_mode = nfstov_mode(*tl);
rdev = fxdr_unsigned(long, *(tl+3));
if (vap->va_type == VREG || vap->va_type == VSOCK) {
vrele(nd.ni_startdir);
if (error = VOP_CREATE(&nd, vap, p))
nfsm_reply(0);
FREE(nd.ni_pnbuf, M_NAMEI);
} else if (vap->va_type == VCHR || vap->va_type == VBLK ||
vap->va_type == VFIFO) {
if (vap->va_type == VCHR && rdev == 0xffffffff)
vap->va_type = VFIFO;
if (vap->va_type == VFIFO) {
#ifndef FIFO
VOP_ABORTOP(&nd);
vput(nd.ni_dvp);
error = ENXIO;
goto out;
#endif /* FIFO */
} else if (error = suser(cred, (u_short *)0)) {
VOP_ABORTOP(&nd);
vput(nd.ni_dvp);
goto out;
} else
vap->va_rdev = (dev_t)rdev;
if (error = VOP_MKNOD(&nd, vap, cred, p)) {
vrele(nd.ni_startdir);
nfsm_reply(0);
}
nd.ni_nameiop &= ~(OPMASK | LOCKPARENT | SAVESTART);
nd.ni_nameiop |= LOOKUP;
if (error = lookup(&nd, p)) {
free(nd.ni_pnbuf, M_NAMEI);
nfsm_reply(0);
}
FREE(nd.ni_pnbuf, M_NAMEI);
if (nd.ni_more) {
vrele(nd.ni_dvp);
vput(nd.ni_vp);
VOP_ABORTOP(&nd);
error = EINVAL;
nfsm_reply(0);
}
} else {
VOP_ABORTOP(&nd);
vput(nd.ni_dvp);
error = ENXIO;
goto out;
}
vp = nd.ni_vp;
} else {
vrele(nd.ni_startdir);
free(nd.ni_pnbuf, M_NAMEI);
vp = nd.ni_vp;
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
VOP_ABORTOP(&nd);
vap->va_size = fxdr_unsigned(long, *(tl+3)); /* 28 Aug 92*/
/* 08 Sep 92*/ if (vap->va_size != -1 && (error = VOP_SETATTR(vp, vap, cred, p))) {
vput(vp);
nfsm_reply(0);
}
}
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred, p);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
return (error);
nfsmout:
if (nd.ni_nameiop)
vrele(nd.ni_startdir);
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vput(nd.ni_vp);
return (error);
out:
vrele(nd.ni_startdir);
free(nd.ni_pnbuf, M_NAMEI);
nfsm_reply(0);
}
/*
* nfs remove service
*/
nfsrv_remove(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct nameidata nd;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
nfsm_reply(0);
vp = nd.ni_vp;
if (vp->v_type == VDIR &&
(error = suser(cred, (u_short *)0)))
goto out;
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT) {
error = EBUSY;
goto out;
}
if (vp->v_flag & VTEXT)
(void) vnode_pager_uncache(vp);
out:
if (!error) {
error = VOP_REMOVE(&nd, p);
} else {
VOP_ABORTOP(&nd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs rename service
*/
nfsrv_rename(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct nameidata fromnd, tond;
struct vnode *fvp, *tvp, *tdvp;
nfsv2fh_t fnfh, tnfh;
fhandle_t *ffhp, *tfhp;
long len, len2;
int rootflg = 0;
ffhp = &fnfh.fh_generic;
tfhp = &tnfh.fh_generic;
fromnd.ni_nameiop = 0;
tond.ni_nameiop = 0;
nfsm_srvmtofh(ffhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
/*
* Remember if we are root so that we can reset cr_uid before
* the second nfs_namei() call
*/
if (cred->cr_uid == 0)
rootflg++;
fromnd.ni_cred = cred;
fromnd.ni_nameiop = DELETE | WANTPARENT | SAVESTART;
if (error = nfs_namei(&fromnd, ffhp, len, &md, &dpos, p))
nfsm_reply(0);
fvp = fromnd.ni_vp;
nfsm_srvmtofh(tfhp);
nfsm_strsiz(len2, NFS_MAXNAMLEN);
if (rootflg)
cred->cr_uid = 0;
tond.ni_cred = cred;
tond.ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE
| SAVESTART;
if (error = nfs_namei(&tond, tfhp, len2, &md, &dpos, p)) {
VOP_ABORTOP(&fromnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = EISDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = ENOTDIR;
goto out;
}
}
if (fvp->v_mount != tdvp->v_mount) {
error = EXDEV;
goto out;
}
if (fvp == tdvp)
error = EINVAL;
/*
* If source is the same as the destination (that is the
* same vnode with the same name in the same directory),
* then there is nothing to do.
*/
if (fvp == tvp && fromnd.ni_dvp == tdvp &&
fromnd.ni_namelen == tond.ni_namelen &&
!bcmp(fromnd.ni_ptr, tond.ni_ptr, fromnd.ni_namelen))
error = -1;
out:
if (!error) {
error = VOP_RENAME(&fromnd, &tond, p);
} else {
VOP_ABORTOP(&tond);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(&fromnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
vrele(tond.ni_startdir);
FREE(tond.ni_pnbuf, M_NAMEI);
out1:
vrele(fromnd.ni_startdir);
FREE(fromnd.ni_pnbuf, M_NAMEI);
nfsm_reply(0);
return (error);
nfsmout:
if (tond.ni_nameiop) {
vrele(tond.ni_startdir);
FREE(tond.ni_pnbuf, M_NAMEI);
}
if (fromnd.ni_nameiop) {
vrele(fromnd.ni_startdir);
FREE(fromnd.ni_pnbuf, M_NAMEI);
VOP_ABORTOP(&fromnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
}
return (error);
}
/*
* nfs link service
*/
nfsrv_link(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct nameidata nd;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp, *xp;
nfsv2fh_t nfh, dnfh;
fhandle_t *fhp, *dfhp;
long len;
fhp = &nfh.fh_generic;
dfhp = &dnfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvmtofh(dfhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
if (error = nfsrv_fhtovp(fhp, FALSE, &vp, cred))
nfsm_reply(0);
if (vp->v_type == VDIR && (error = suser(cred, NULL)))
goto out1;
nd.ni_cred = cred;
nd.ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(&nd, dfhp, len, &md, &dpos, p))
goto out1;
xp = nd.ni_vp;
if (xp != NULL) {
error = EEXIST;
goto out;
}
xp = nd.ni_dvp;
if (vp->v_mount != xp->v_mount)
error = EXDEV;
out:
if (!error) {
error = VOP_LINK(vp, &nd, p);
} else {
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
}
out1:
vrele(vp);
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs symbolic link service
*/
nfsrv_symlink(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct vattr va;
struct nameidata nd;
register struct vattr *vap = &va;
register u_long *tl;
register long t1;
struct nfsv2_sattr *sp;
caddr_t bpos;
struct uio io;
struct iovec iv;
int error = 0;
char *pathcp, *cp2;
struct mbuf *mb, *mreq;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len, len2;
pathcp = (char *)0;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
goto out;
nfsm_strsiz(len2, NFS_MAXPATHLEN);
MALLOC(pathcp, caddr_t, len2 + 1, M_TEMP, M_WAITOK);
iv.iov_base = pathcp;
iv.iov_len = len2;
io.uio_resid = len2;
io.uio_offset = 0;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_procp = (struct proc *)0;
nfsm_mtouio(&io, len2);
nfsm_disect(sp, struct nfsv2_sattr *, NFSX_SATTR);
*(pathcp + len2) = '\0';
if (nd.ni_vp) {
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
goto out;
}
VATTR_NULL(vap);
vap->va_mode = fxdr_unsigned(u_short, sp->sa_mode);
error = VOP_SYMLINK(&nd, vap, pathcp, p);
out:
if (pathcp)
FREE(pathcp, M_TEMP);
nfsm_reply(0);
return (error);
nfsmout:
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
if (pathcp)
FREE(pathcp, M_TEMP);
return (error);
}
/*
* nfs mkdir service
*/
nfsrv_mkdir(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
struct vattr va;
register struct vattr *vap = &va;
register struct nfsv2_fattr *fp;
struct nameidata nd;
register caddr_t cp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
nfsm_reply(0);
nfsm_disect(tl, u_long *, NFSX_UNSIGNED);
VATTR_NULL(vap);
vap->va_type = VDIR;
vap->va_mode = nfstov_mode(*tl++);
vp = nd.ni_vp;
if (vp != NULL) {
VOP_ABORTOP(&nd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
error = EEXIST;
nfsm_reply(0);
}
if (error = VOP_MKDIR(&nd, vap, p))
nfsm_reply(0);
vp = nd.ni_vp;
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred, p);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
return (error);
nfsmout:
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
return (error);
}
/*
* nfs rmdir service
*/
nfsrv_rmdir(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
struct nameidata nd;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
nd.ni_cred = cred;
nd.ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
if (error = nfs_namei(&nd, fhp, len, &md, &dpos, p))
nfsm_reply(0);
vp = nd.ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (nd.ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
out:
if (!error) {
error = VOP_RMDIR(&nd, p);
} else {
VOP_ABORTOP(&nd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs readdir service
* - mallocs what it thinks is enough to read
* count rounded up to a multiple of NFS_DIRBLKSIZ <= NFS_MAXREADDIR
* - calls VOP_READDIR()
* - loops around building the reply
* if the output generated exceeds count break out of loop
* The nfsm_clget macro is used here so that the reply will be packed
* tightly in mbuf clusters.
* - it only knows that it has encountered eof when the VOP_READDIR()
* reads nothing
* - as such one readdir rpc will return eof false although you are there
* and then the next will return eof
* - it trims out records with d_ino == 0
* this doesn't matter for Unix clients, but they might confuse clients
* for other os'.
* NB: It is tempting to set eof to true if the VOP_READDIR() reads less
* than requested, but this may not apply to all filesystems. For
* example, client NFS does not { although it is never remote mounted
* anyhow }
* PS: The NFS protocol spec. does not clarify what the "count" byte
* argument is a count of.. just name strings and file id's or the
* entire reply rpc or ...
* I tried just file name and id sizes and it confused the Sun client,
* so I am using the full rpc size now. The "paranoia.." comment refers
* to including the status longwords that are not a part of the dir.
* "entry" structures, but are in the rpc.
*/
nfsrv_readdir(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register char *bp, *be;
register struct mbuf *mp;
register struct direct *dp;
register caddr_t cp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
char *cpos, *cend;
int len, nlen, rem, xfer, tsiz, i;
struct vnode *vp;
struct mbuf *mp2, *mp3;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io;
struct iovec iv;
int siz, cnt, fullsiz, eofflag;
u_long on;
char *rbuf;
off_t off, toff;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(tl, u_long *, 2*NFSX_UNSIGNED);
toff = fxdr_unsigned(off_t, *tl++);
off = (toff & ~(NFS_DIRBLKSIZ-1));
on = (toff & (NFS_DIRBLKSIZ-1));
cnt = fxdr_unsigned(int, *tl);
siz = ((cnt+NFS_DIRBLKSIZ-1) & ~(NFS_DIRBLKSIZ-1));
if (cnt > NFS_MAXREADDIR)
siz = NFS_MAXREADDIR;
fullsiz = siz;
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VEXEC, cred, p)) {
vput(vp);
nfsm_reply(0);
}
VOP_UNLOCK(vp);
MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
again:
iv.iov_base = rbuf;
iv.iov_len = fullsiz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = off;
io.uio_resid = fullsiz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_procp = (struct proc *)0;
error = VOP_READDIR(vp, &io, cred, &eofflag);
off = io.uio_offset;
if (error) {
vrele(vp);
free((caddr_t)rbuf, M_TEMP);
nfsm_reply(0);
}
if (io.uio_resid) {
siz -= io.uio_resid;
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
nfsm_reply(2*NFSX_UNSIGNED);
nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
*tl++ = nfs_false;
*tl = nfs_true;
FREE((caddr_t)rbuf, M_TEMP);
return (0);
}
}
/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf + on;
cend = rbuf + siz;
dp = (struct direct *)cpos;
while (cpos < cend && dp->d_ino == 0) {
cpos += dp->d_reclen;
dp = (struct direct *)cpos;
}
if (cpos >= cend) {
toff = off;
siz = fullsiz;
on = 0;
goto again;
}
cpos = rbuf + on;
cend = rbuf + siz;
dp = (struct direct *)cpos;
vrele(vp);
len = 3*NFSX_UNSIGNED; /* paranoia, probably can be 0 */
bp = be = (caddr_t)0;
mp3 = (struct mbuf *)0;
nfsm_reply(siz);
/* Loop through the records and build reply */
while (cpos < cend) {
if (dp->d_ino != 0) {
nlen = dp->d_namlen;
rem = nfsm_rndup(nlen)-nlen;
/*
* As noted above, the NFS spec. is not clear about what
* should be included in "count" as totalled up here in
* "len".
*/
len += (4*NFSX_UNSIGNED+nlen+rem);
if (len > cnt) {
eofflag = 0;
break;
}
/* Build the directory record xdr from the direct entry */
nfsm_clget;
*tl = nfs_true;
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(dp->d_ino);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;
/* And loop arround copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp+xfer) > be)
tsiz = be-bp;
else
tsiz = xfer;
bcopy(cp, bp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to a long boundary */
for (i = 0; i < rem; i++)
*bp++ = '\0';
nfsm_clget;
/* Finish off the record */
toff += dp->d_reclen;
*tl = txdr_unsigned(toff);
bp += NFSX_UNSIGNED;
} else
toff += dp->d_reclen;
cpos += dp->d_reclen;
dp = (struct direct *)cpos;
}
nfsm_clget;
*tl = nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
if (eofflag)
*tl = nfs_true;
else
*tl = nfs_false;
bp += NFSX_UNSIGNED;
if (bp < be)
mp->m_len = bp-mtod(mp, caddr_t);
mb->m_next = mp3;
FREE(rbuf, M_TEMP);
nfsm_srvdone;
}
/*
* nfs statfs service
*/
nfsrv_statfs(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
register struct statfs *sf;
register struct nfsv2_statfs *sfp;
register u_long *tl;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct statfs statfs;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
sf = &statfs;
error = VFS_STATFS(vp->v_mount, sf, p);
vput(vp);
nfsm_reply(NFSX_STATFS);
nfsm_build(sfp, struct nfsv2_statfs *, NFSX_STATFS);
sfp->sf_tsize = txdr_unsigned(NFS_MAXDGRAMDATA);
sfp->sf_bsize = txdr_unsigned(sf->f_fsize);
sfp->sf_blocks = txdr_unsigned(sf->f_blocks);
sfp->sf_bfree = txdr_unsigned(sf->f_bfree);
sfp->sf_bavail = txdr_unsigned(sf->f_bavail);
nfsm_srvdone;
}
/*
* Null operation, used by clients to ping server
*/
/* ARGSUSED */
nfsrv_null(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
caddr_t bpos;
int error = 0;
struct mbuf *mb, *mreq;
error = VNOVAL;
nfsm_reply(0);
return (error);
}
/*
* No operation, used for obsolete procedures
*/
/* ARGSUSED */
nfsrv_noop(mrep, md, dpos, cred, xid, mrq, repstat, p)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
struct proc *p;
{
caddr_t bpos;
int error; /* 08 Sep 92*/
struct mbuf *mb, *mreq;
if (*repstat) /* 08 Sep 92*/
error = *repstat;
else
error = EPROCUNAVAIL;
nfsm_reply(0);
return (error);
}
/*
* Perform access checking for vnodes obtained from file handles that would
* refer to files already opened by a Unix client. You cannot just use
* vn_writechk() and VOP_ACCESS() for two reasons.
* 1 - You must check for MNT_EXRDONLY as well as MNT_RDONLY for the write case
* 2 - The owner is to be given access irrespective of mode bits so that
* processes that chmod after opening a file don't break. I don't like
* this because it opens a security hole, but since the nfs server opens
* a security hole the size of a barn door anyhow, what the heck.
*/
nfsrv_access(vp, flags, cred, p)
register struct vnode *vp;
int flags;
register struct ucred *cred;
struct proc *p;
{
struct vattr vattr;
int error;
if (flags & VWRITE) {
/* Just vn_writechk() changed to check MNT_EXRDONLY */
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket or a block or character
* device resident on the file system.
*/
if (vp->v_mount->mnt_flag & (MNT_RDONLY | MNT_EXRDONLY)) {
switch (vp->v_type) {
case VREG: case VDIR: case VLNK:
return (EROFS);
}
}
/*
* If there's shared text associated with
* the inode, try to free it up once. If
* we fail, we can't allow writing.
*/
if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp))
return (ETXTBSY);
}
if (error = VOP_GETATTR(vp, &vattr, cred, p))
return (error);
if ((error = VOP_ACCESS(vp, flags, cred, p)) &&
cred->cr_uid != vattr.va_uid)
return (error);
return (0);
}
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