/* $NetBSD: nfs_serv.c,v 1.184 2023/03/23 19:53:01 riastradh Exp $ */

/* $NetBSD: nfs_serv.c,v 1.184 2023/03/23 19:53:01 riastradh Exp $ */

/*
* 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. 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_serv.c 8.8 (Berkeley) 7/31/95
*/

/*
* nfs version 2 and 3 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.
* For Version 3, nfsm_reply() does not return for the error case, since
* most version 3 rpcs return more than the status for error cases.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_serv.c,v 1.184 2023/03/23 19:53:01 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/fstrans.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/kernel.h>
#include <sys/hash.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <sys/syscall.h>
#include <sys/syscallargs.h>
#include <sys/syscallvar.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_loan.h>
#include <uvm/uvm_page.h>

#include <nfs/nfsproto.h>
#include <nfs/rpcv2.h>
#include <nfs/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfs_var.h>

MODULE(MODULE_CLASS_MISC, nfsserver, "nfs");

/* Global vars */
extern u_int32_t nfs_xdrneg1;
extern u_int32_t nfs_false, nfs_true;
extern const enum vtype nv3tov_type[8];
extern struct nfsstats nfsstats;
extern const nfstype nfsv2_type[9];
extern const nfstype nfsv3_type[9];
int nfsrvw_procrastinate = NFS_GATHERDELAY * 1000;
bool nfsd_use_loan = true; /* use page-loan for READ OP */

#define nqsrv_getl(vp, rw) /* nothing */

static const struct syscall_package nfsserver_syscalls[] = {
{ SYS_nfssvc, 0, (sy_call_t *)sys_nfssvc },
{ 0, 0, NULL },
};

static int
nfsserver_modcmd(modcmd_t cmd, void *arg)
{
extern struct vfs_hooks nfs_export_hooks; /* XXX */
int error;

switch (cmd) {
case MODULE_CMD_INIT:
error = syscall_establish(NULL, nfsserver_syscalls);
if (error != 0) {
return error;
}
nfs_init(); /* XXX for monolithic kernel */
netexport_init();
nfsrv_initcache(); /* Init the server request cache */
nfsrv_init(0); /* Init server data structures */
vfs_hooks_attach(&nfs_export_hooks);
nfs_timer_srvinit(nfsrv_timer);
return 0;
case MODULE_CMD_FINI:
error = syscall_disestablish(NULL, nfsserver_syscalls);
if (error != 0) {
return error;
}
/*
* Kill export list before detaching VFS hooks, so we
* we don't leak state due to a concurrent umount().
*/
netexport_fini();
vfs_hooks_detach(&nfs_export_hooks);

/* Kill timer before server goes away. */
nfs_timer_srvfini();
nfsrv_fini();

/* Server uses server cache, so kill cache last. */
nfsrv_finicache();
nfs_fini();
return 0;
case MODULE_CMD_AUTOUNLOAD:
if (netexport_hasexports())
return EBUSY;
/*FALLTHROUGH*/
default:
return ENOTTY;
}
}

/*
* nfs v3 access service
*/
int
nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vnode *vp;
nfsrvfh_t nsfh;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, getret;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vattr va;
u_long inmode, testmode, outmode;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam, &rdonly,
(nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(1, (struct vattr *)0);
return (0);
}
inmode = fxdr_unsigned(u_int32_t, *tl);
outmode = 0;
if ((inmode & NFSV3ACCESS_READ) &&
nfsrv_access(vp, VREAD, cred, rdonly, lwp, 0) == 0)
outmode |= NFSV3ACCESS_READ;
if (vp->v_type != VDIR) {
testmode = inmode & (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
if (testmode &&
nfsrv_access(vp, VWRITE, cred, rdonly, lwp, 0) == 0)
outmode |= testmode;
if ((inmode & NFSV3ACCESS_EXECUTE) &&
nfsrv_access(vp, VEXEC, cred, rdonly, lwp, 0) == 0)
outmode |= NFSV3ACCESS_EXECUTE;
} else {
testmode = inmode & (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
NFSV3ACCESS_DELETE);
if (testmode &&
nfsrv_access(vp, VWRITE, cred, rdonly, lwp, 0) == 0)
outmode |= testmode;
if ((inmode & NFSV3ACCESS_LOOKUP) &&
nfsrv_access(vp, VEXEC, cred, rdonly, lwp, 0) == 0)
outmode |= NFSV3ACCESS_LOOKUP;
}
getret = VOP_GETATTR(vp, &va, cred);
vput(vp);
nfsm_reply(NFSX_POSTOPATTR(1) + NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &va);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(outmode);
nfsm_srvdone;
}

/*
* nfs getattr service
*/
int
nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct vattr va;
struct vnode *vp;
nfsrvfh_t nsfh;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0;
char *cp2;
struct mbuf *mb, *mreq __unused;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam, &rdonly,
(nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(0);
return (0);
}
nqsrv_getl(vp, ND_READ);
error = VOP_GETATTR(vp, &va, cred);
vput(vp);
nfsm_reply(NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
if (error)
return (0);
nfsm_build(fp, struct nfs_fattr *, NFSX_FATTR(nfsd->nd_flag & ND_NFSV3));
nfsm_srvfillattr(&va, fp);
nfsm_srvdone;
}

/*
* nfs setattr service
*/
int
nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vattr va, preat;
struct nfsv2_sattr *sp;
struct nfs_fattr *fp;
struct vnode *vp;
nfsrvfh_t nsfh;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, preat_ret = 1, postat_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3), gcheck = 0;
char *cp2;
struct mbuf *mb, *mreq __unused;
u_quad_t frev;
struct timespec guard;

memset(&guard, 0, sizeof guard); /* XXX gcc */

nfsm_srvmtofh(&nsfh);
vattr_null(&va);
if (v3) {
nfsm_srvsattr(&va);
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
gcheck = fxdr_unsigned(int, *tl);
if (gcheck) {
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
fxdr_nfsv3time(tl, &guard);
}
} else {
nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
/*
* 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)
va.va_mode = nfstov_mode(sp->sa_mode);
if (sp->sa_uid != nfs_xdrneg1)
va.va_uid = fxdr_unsigned(uid_t, sp->sa_uid);
if (sp->sa_gid != nfs_xdrneg1)
va.va_gid = fxdr_unsigned(gid_t, sp->sa_gid);
if (sp->sa_size != nfs_xdrneg1)
va.va_size = fxdr_unsigned(u_quad_t, sp->sa_size);
if (sp->sa_atime.nfsv2_sec != nfs_xdrneg1) {
#ifdef notyet
fxdr_nfsv2time(&sp->sa_atime, &va.va_atime);
#else
va.va_atime.tv_sec =
fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
va.va_atime.tv_nsec = 0;
#endif
}
if (sp->sa_mtime.nfsv2_sec != nfs_xdrneg1)
fxdr_nfsv2time(&sp->sa_mtime, &va.va_mtime);

}

/*
* Now that we have all the fields, lets do it.
*/
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam, &rdonly,
(nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, &va);
return (0);
}
nqsrv_getl(vp, ND_WRITE);
if (v3) {
error = preat_ret = VOP_GETATTR(vp, &preat, cred);
if (!error && gcheck &&
(preat.va_ctime.tv_sec != guard.tv_sec ||
preat.va_ctime.tv_nsec != guard.tv_nsec))
error = NFSERR_NOT_SYNC;
if (error) {
vput(vp);
nfsm_reply(NFSX_WCCDATA(v3));
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, &va);
return (0);
}
}

/*
* If the size is being changed write access is required, otherwise
* just check for a read only file system.
*/
if (va.va_size == ((u_quad_t)((quad_t) -1))) {
if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
error = EROFS;
goto out;
}
} else {
if (vp->v_type == VDIR) {
error = EISDIR;
goto out;
} else if ((error = nfsrv_access(vp, VWRITE, cred, rdonly,
lwp, 0)) != 0)
goto out;
}
error = VOP_SETATTR(vp, &va, cred);
postat_ret = VOP_GETATTR(vp, &va, cred);
if (!error)
error = postat_ret;
out:
vput(vp);
nfsm_reply(NFSX_WCCORFATTR(v3));
if (v3) {
nfsm_srvwcc_data(preat_ret, &preat, postat_ret, &va);
return (0);
} else {
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
nfsm_srvdone;
}

/*
* nfs lookup rpc
*/
int
nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct nameidata nd, ind, *ndp = &nd;
struct pathbuf *ipb = NULL;
struct vnode *vp, *dirp;
nfsrvfh_t nsfh;
char *cp;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, cache = 0, dirattr_ret = 1;
uint32_t len;
int v3 = (nfsd->nd_flag & ND_NFSV3), pubflag;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vattr va, dirattr;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);

pubflag = nfs_ispublicfh(&nsfh);

nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = LOOKUP;
nd.ni_cnd.cn_flags = LOCKLEAF;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, NULL, NULL,
lwp, (nfsd->nd_flag & ND_KERBAUTH), pubflag);

if (!error && pubflag) {
if (nd.ni_vp->v_type == VDIR && nfs_pub.np_index != NULL &&
(ipb = pathbuf_create(nfs_pub.np_index)) != NULL) {
/*
* Setup call to lookup() to see if we can find
* the index file. Arguably, this doesn't belong
* in a kernel.. Ugh.
*/
ind = nd;
VOP_UNLOCK(nd.ni_vp);
ind.ni_pathbuf = ipb;

error = lookup_for_nfsd_index(&ind, nd.ni_vp);
if (!error) {
/*
* Found an index file. Get rid of
* the old references.
*/
if (dirp)
vrele(dirp);
dirp = nd.ni_vp;
ndp = &ind;
} else
error = 0;
}
/*
* If the public filehandle was used, check that this lookup
* didn't result in a filehandle outside the publicly exported
* filesystem.
*/

if (!error && ndp->ni_vp->v_mount != nfs_pub.np_mount) {
vput(nd.ni_vp);
error = EPERM;
}
}

if (error) {
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
}
if (ipb != NULL) {
pathbuf_destroy(ipb);
}
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
dirattr_ret = VOP_GETATTR(dirp, &dirattr, cred);
vput(dirp);
} else
vrele(dirp);
}
nfsm_reply(NFSX_POSTOPATTR(v3));
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
return (0);
}

nqsrv_getl(ndp->ni_startdir, ND_READ);
pathbuf_destroy(nd.ni_pathbuf);
if (ipb != NULL) {
pathbuf_destroy(ipb);
}
vp = ndp->ni_vp;
error = nfsrv_composefh(vp, &nsfh, v3);
if (!error)
error = VOP_GETATTR(vp, &va, cred);
vput(vp);
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
dirattr_ret = VOP_GETATTR(dirp, &dirattr, cred);
vput(dirp);
} else
vrele(dirp);
}
nfsm_reply(NFSX_SRVFH(&nsfh, v3) + NFSX_POSTOPORFATTR(v3) +
NFSX_POSTOPATTR(v3));
if (error) {
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
return (0);
}
nfsm_srvfhtom(&nsfh, v3);
if (v3) {
nfsm_srvpostop_attr(0, &va);
nfsm_srvpostop_attr(dirattr_ret, &dirattr);
} else {
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
nfsm_srvdone;
}

/*
* nfs readlink service
*/
int
nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
struct iovec *ivp = iv;
struct mbuf *mp;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, i, padlen, getret;
uint32_t len;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mp2 = NULL, *mp3 = NULL, *mreq __unused;
struct vnode *vp;
struct vattr attr;
nfsrvfh_t nsfh;
struct uio io, *uiop = &io;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
len = 0;
i = 0;
while (len < NFS_MAXPATHLEN) {
mp = m_get(M_WAIT, MT_DATA);
MCLAIM(mp, &nfs_mowner);
m_clget(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, void *);
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;
UIO_SETUP_SYSSPACE(uiop);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
m_freem(mp3);
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvpostop_attr(1, (struct vattr *)0);
return (0);
}
if (vp->v_type != VLNK) {
if (v3)
error = EINVAL;
else
error = ENXIO;
goto out;
}
nqsrv_getl(vp, ND_READ);
error = VOP_READLINK(vp, uiop, cred);
out:
getret = VOP_GETATTR(vp, &attr, cred);
vput(vp);
if (error)
m_freem(mp3);
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_UNSIGNED);
if (v3) {
nfsm_srvpostop_attr(getret, &attr);
if (error)
return (0);
}
len -= uiop->uio_resid;
padlen = nfsm_padlen(len);
if (len == 0) {
m_freem(mp3);
mp3 = NULL;
} else if (uiop->uio_resid || padlen)
nfs_zeropad(mp3, uiop->uio_resid, padlen);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(len);
mb->m_next = mp3;
nfsm_srvdone;
}

/*
* nfs read service
*/
int
nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct mbuf *m;
struct nfs_fattr *fp;
u_int32_t *tl;
int32_t t1;
int i;
char *bpos;
int error = 0, rdonly, cache = 0, getret;
int v3 = (nfsd->nd_flag & ND_NFSV3);
uint32_t reqlen, len, cnt, left;
int padlen;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsrvfh_t nsfh;
struct uio io, *uiop = &io;
struct vattr va;
off_t off;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
if (v3) {
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
} else {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
off = (off_t)fxdr_unsigned(u_int32_t, *tl);
}
nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED);
reqlen = fxdr_unsigned(uint32_t, *tl);
reqlen = MIN(reqlen, NFS_SRVMAXDATA(nfsd));
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvpostop_attr(1, (struct vattr *)0);
return (0);
}
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
if (!error) {
nqsrv_getl(vp, ND_READ);
if ((error = nfsrv_access(vp, VREAD, cred, rdonly, lwp, 1)) != 0)
error = nfsrv_access(vp, VEXEC, cred, rdonly, lwp, 1);
}
getret = VOP_GETATTR(vp, &va, cred);
if (!error)
error = getret;
if (error) {
vput(vp);
nfsm_reply(NFSX_POSTOPATTR(v3));
nfsm_srvpostop_attr(getret, &va);
return (0);
}
if (off >= va.va_size)
cnt = 0;
else if ((off + reqlen) > va.va_size)
cnt = va.va_size - off;
else
cnt = reqlen;
nfsm_reply(NFSX_POSTOPORFATTR(v3) + 3 * NFSX_UNSIGNED+nfsm_rndup(cnt));
if (v3) {
nfsm_build(tl, u_int32_t *, NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
*tl++ = nfs_true;
fp = (struct nfs_fattr *)tl;
tl += (NFSX_V3FATTR / sizeof (u_int32_t));
} else {
nfsm_build(tl, u_int32_t *, NFSX_V2FATTR + NFSX_UNSIGNED);
fp = (struct nfs_fattr *)tl;
tl += (NFSX_V2FATTR / sizeof (u_int32_t));
}
len = left = cnt;
if (cnt > 0) {
if (nfsd_use_loan) {
struct vm_page **pgpp;
voff_t pgoff = trunc_page(off);
int npages;
vaddr_t lva;

npages = (round_page(off + cnt) - pgoff) >> PAGE_SHIFT;
KASSERT(npages <= M_EXT_MAXPAGES); /* XXX */

/* allocate kva for mbuf data */
lva = sokvaalloc(pgoff, npages << PAGE_SHIFT,
slp->ns_so);
if (lva == 0) {
/* fall back to VOP_READ */
goto loan_fail;
}

/* allocate mbuf */
m = m_get(M_WAIT, MT_DATA);
MCLAIM(m, &nfs_mowner);
pgpp = m->m_ext.ext_pgs;

/* loan pages */
error = uvm_loanuobjpages(&vp->v_uobj, pgoff, npages,
pgpp);
if (error) {
sokvafree(lva, npages << PAGE_SHIFT);
m_free(m);
if (error == EBUSY)
goto loan_fail;
goto read_error;
}

/* associate kva to mbuf */
MEXTADD(m, (void *)(lva + ((vaddr_t)off & PAGE_MASK)),
cnt, M_MBUF, soloanfree, slp->ns_so);
m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
m->m_len = cnt;

/* map pages */
for (i = 0; i < npages; i++) {
pmap_kenter_pa(lva, VM_PAGE_TO_PHYS(pgpp[i]),
VM_PROT_READ, 0);
lva += PAGE_SIZE;
}

pmap_update(pmap_kernel());

mb->m_next = m;
mb = m;
error = 0;
uiop->uio_resid = 0;
} else {
struct iovec *iv;
struct iovec *iv2;
struct mbuf *m2;
int siz;
loan_fail:
/*
* Generate the mbuf list with the uio_iov ref. to it.
*/
i = 0;
m = m2 = mb;
while (left > 0) {
siz = uimin(M_TRAILINGSPACE(m), left);
if (siz > 0) {
left -= siz;
i++;
}
if (left > 0) {
m = m_get(M_WAIT, MT_DATA);
MCLAIM(m, &nfs_mowner);
m_clget(m, M_WAIT);
m->m_len = 0;
m2->m_next = m;
m2 = m;
}
}
iv = malloc(i * sizeof(struct iovec), M_TEMP, M_WAITOK);
uiop->uio_iov = iv2 = iv;
m = mb;
left = cnt;
i = 0;
while (left > 0) {
if (m == NULL)
panic("nfsrv_read iov");
siz = uimin(M_TRAILINGSPACE(m), left);
if (siz > 0) {
iv->iov_base = mtod(m, char *) +
m->m_len;
iv->iov_len = siz;
m->m_len += siz;
left -= siz;
iv++;
i++;
}
m = m->m_next;
}
uiop->uio_iovcnt = i;
uiop->uio_offset = off;
uiop->uio_resid = cnt;
uiop->uio_rw = UIO_READ;
UIO_SETUP_SYSSPACE(uiop);
error = VOP_READ(vp, uiop, IO_NODELOCKED, cred);
free((void *)iv2, M_TEMP);
}
read_error:
if (error || (getret = VOP_GETATTR(vp, &va, cred)) != 0){
if (!error)
error = getret;
m_freem(mreq);
vput(vp);
nfsm_reply(NFSX_POSTOPATTR(v3));
nfsm_srvpostop_attr(getret, &va);
return (0);
}
} else {
uiop->uio_resid = 0;
}
vput(vp);
nfsm_srvfillattr(&va, fp);
len -= uiop->uio_resid;
padlen = nfsm_padlen(len);
if (uiop->uio_resid || padlen)
nfs_zeropad(mb, uiop->uio_resid, padlen);
if (v3) {
/* count */
*tl++ = txdr_unsigned(len);
/* eof */
if (off + len >= va.va_size)
*tl++ = nfs_true;
else
*tl++ = nfs_false;
}
*tl = txdr_unsigned(len);
nfsm_srvdone;
}

/*
* nfs write service
*/
int
nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct iovec *ivp;
int i, cnt;
struct mbuf *mp;
struct nfs_fattr *fp;
struct iovec *iv;
struct vattr va, forat;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, len, forat_ret = 1;
int ioflags, aftat_ret = 1, retlen, zeroing, adjust;
int stable = NFSV3WRITE_FILESYNC;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp;
nfsrvfh_t nsfh;
struct uio io, *uiop = &io;
off_t off;
u_quad_t frev;

if (mrep == NULL) {
*mrq = NULL;
return (0);
}
nfsm_srvmtofh(&nsfh);
if (v3) {
nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
tl += 3;
stable = fxdr_unsigned(int, *tl++);
} else {
nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
tl += 2;
}
retlen = len = fxdr_unsigned(int32_t, *tl);
cnt = i = 0;

/*
* For NFS Version 2, it is not obvious what a write of zero length
* should do, but I might as well be consistent with Version 3,
* which is to return ok so long as there are no permission problems.
*/
if (len > 0) {
zeroing = 1;
mp = mrep;
while (mp) {
if (mp == md) {
zeroing = 0;
adjust = dpos - mtod(mp, char *);
mp->m_len -= adjust;
if (mp->m_len > 0 && adjust > 0)
NFSMADV(mp, adjust);
}
if (zeroing)
mp->m_len = 0;
else if (mp->m_len > 0) {
i += mp->m_len;
if (i > len) {
mp->m_len -= (i - len);
zeroing = 1;
}
if (mp->m_len > 0)
cnt++;
}
mp = mp->m_next;
}
}
if (len > NFS_MAXDATA || len < 0 || i < len) {
error = EIO;
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
return (0);
}
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
return (0);
}
if (v3)
forat_ret = VOP_GETATTR(vp, &forat, cred);
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
if (!error) {
nqsrv_getl(vp, ND_WRITE);
error = nfsrv_access(vp, VWRITE, cred, rdonly, lwp, 1);
}
if (error) {
vput(vp);
nfsm_reply(NFSX_WCCDATA(v3));
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
return (0);
}

if (len > 0) {
ivp = malloc(cnt * sizeof (struct iovec), M_TEMP, M_WAITOK);
uiop->uio_iov = iv = ivp;
uiop->uio_iovcnt = cnt;
mp = mrep;
while (mp) {
if (mp->m_len > 0) {
ivp->iov_base = mtod(mp, void *);
ivp->iov_len = mp->m_len;
ivp++;
}
mp = mp->m_next;
}

/*
* XXX
* The IO_METASYNC flag indicates that all metadata (and not
* just enough to ensure data integrity) must be written to
* stable storage synchronously.
* (IO_METASYNC is not yet implemented in 4.4BSD-Lite.)
*/
if (stable == NFSV3WRITE_UNSTABLE)
ioflags = IO_NODELOCKED;
else if (stable == NFSV3WRITE_DATASYNC)
ioflags = (IO_SYNC | IO_NODELOCKED);
else
ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
uiop->uio_resid = len;
uiop->uio_rw = UIO_WRITE;
uiop->uio_offset = off;
UIO_SETUP_SYSSPACE(uiop);
error = VOP_WRITE(vp, uiop, ioflags, cred);
nfsstats.srvvop_writes++;
free(iv, M_TEMP);
}
aftat_ret = VOP_GETATTR(vp, &va, cred);
vput(vp);
if (!error)
error = aftat_ret;
nfsm_reply(NFSX_PREOPATTR(v3) + NFSX_POSTOPORFATTR(v3) +
2 * NFSX_UNSIGNED + NFSX_WRITEVERF(v3));
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
if (error)
return (0);
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(retlen);
if (stable == NFSV3WRITE_UNSTABLE)
*tl++ = txdr_unsigned(stable);
else
*tl++ = txdr_unsigned(NFSV3WRITE_FILESYNC);
/*
* Actually, there is no need to txdr these fields,
* but it may make the values more human readable,
* for debugging purposes.
*/
struct timeval btv;
getmicroboottime(&btv);
*tl++ = txdr_unsigned(btv.tv_sec);
*tl = txdr_unsigned(btv.tv_usec);
} else {
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
nfsm_srvdone;
}

/*
* XXX elad: the original NFSW_SAMECRED() macro also made sure the
* two nd_flag fields of the descriptors contained
* ND_KERBAUTH.
*/
static int
nfsrv_samecred(kauth_cred_t cred1, kauth_cred_t cred2)
{
int i, do_ngroups;

if (kauth_cred_geteuid(cred1) != kauth_cred_geteuid(cred2))
return (0);
if (kauth_cred_ngroups(cred1) != kauth_cred_ngroups(cred2))
return (0);
do_ngroups = kauth_cred_ngroups(cred1);
for (i = 0; i < do_ngroups; i++)
if (kauth_cred_group(cred1, i) !=
kauth_cred_group(cred2, i))
return (0);

return (1);
}

static struct nfsrvw_delayhash *
nfsrv_nwdelayhash(struct nfssvc_sock *slp, const nfsrvfh_t *nsfh)
{
uint32_t hash;

hash = hash32_buf(NFSRVFH_DATA(nsfh), NFSRVFH_SIZE(nsfh),
HASH32_BUF_INIT);
return &slp->ns_wdelayhashtbl[hash % NFS_WDELAYHASHSIZ];
}

/*
* NFS write service with write gathering support. Called when
* nfsrvw_procrastinate > 0.
* See: Chet Juszczak, "Improving the Write Performance of an NFS Server",
* in Proc. of the Winter 1994 Usenix Conference, pg. 247-259, San Franscisco,
* Jan. 1994.
*/
int
nfsrv_writegather(struct nfsrv_descript **ndp, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct timeval now;
struct iovec *ivp;
struct mbuf *mp;
struct nfsrv_descript *wp, *nfsd, *owp, *swp;
struct nfs_fattr *fp;
int i = 0;
struct iovec *iov;
struct nfsrvw_delayhash *wpp;
kauth_cred_t cred;
struct vattr va, forat;
u_int32_t *tl;
int32_t t1;
char *bpos, *dpos;
int error = 0, rdonly, cache = 0, len = 0, forat_ret = 1;
int ioflags, aftat_ret = 1, adjust, v3, zeroing;
char *cp2;
struct mbuf *mb, *mreq, *mrep, *md;
struct vnode *vp;
struct uio io, *uiop = &io;
u_quad_t frev, cur_usec;

*mrq = NULL;
if (*ndp) {
nfsd = *ndp;
*ndp = NULL;
mrep = nfsd->nd_mrep;
md = nfsd->nd_md;
dpos = nfsd->nd_dpos;
cred = nfsd->nd_cr;
v3 = (nfsd->nd_flag & ND_NFSV3);
LIST_INIT(&nfsd->nd_coalesce);
nfsd->nd_mreq = NULL;
nfsd->nd_stable = NFSV3WRITE_FILESYNC;
getmicrotime(&now);
cur_usec = (u_quad_t)now.tv_sec * 1000000 + (u_quad_t)now.tv_usec;
nfsd->nd_time = cur_usec + nfsrvw_procrastinate;

/*
* Now, get the write header..
*/
nfsm_srvmtofh(&nfsd->nd_fh);
if (v3) {
nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
nfsd->nd_off = fxdr_hyper(tl);
tl += 3;
nfsd->nd_stable = fxdr_unsigned(int, *tl++);
} else {
nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
nfsd->nd_off = (off_t)fxdr_unsigned(u_int32_t, *++tl);
tl += 2;
}
len = fxdr_unsigned(int32_t, *tl);
nfsd->nd_len = len;
nfsd->nd_eoff = nfsd->nd_off + len;

/*
* Trim the header out of the mbuf list and trim off any trailing
* junk so that the mbuf list has only the write data.
*/
zeroing = 1;
i = 0;
mp = mrep;
while (mp) {
if (mp == md) {
zeroing = 0;
adjust = dpos - mtod(mp, char *);
mp->m_len -= adjust;
if (mp->m_len > 0 && adjust > 0)
NFSMADV(mp, adjust);
}
if (zeroing)
mp->m_len = 0;
else {
i += mp->m_len;
if (i > len) {
mp->m_len -= (i - len);
zeroing = 1;
}
}
mp = mp->m_next;
}
if (len > NFS_MAXDATA || len < 0 || i < len) {
nfsmout:
m_freem(mrep);
error = EIO;
nfsm_writereply(2 * NFSX_UNSIGNED, v3);
if (v3)
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
nfsd->nd_mreq = mreq;
nfsd->nd_mrep = NULL;
nfsd->nd_time = 0;
}

/*
* Add this entry to the hash and time queues.
*/
owp = NULL;
mutex_enter(&nfsd_lock);
wp = LIST_FIRST(&slp->ns_tq);
while (wp && wp->nd_time < nfsd->nd_time) {
owp = wp;
wp = LIST_NEXT(wp, nd_tq);
}
if (owp) {
LIST_INSERT_AFTER(owp, nfsd, nd_tq);
} else {
LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
}
if (nfsd->nd_mrep) {
wpp = nfsrv_nwdelayhash(slp, &nfsd->nd_fh);
owp = NULL;
wp = LIST_FIRST(wpp);
while (wp && nfsrv_comparefh(&nfsd->nd_fh, &wp->nd_fh)) {
owp = wp;
wp = LIST_NEXT(wp, nd_hash);
}
while (wp && wp->nd_off < nfsd->nd_off &&
!nfsrv_comparefh(&nfsd->nd_fh, &wp->nd_fh)) {
owp = wp;
wp = LIST_NEXT(wp, nd_hash);
}
if (owp) {
LIST_INSERT_AFTER(owp, nfsd, nd_hash);

/*
* Search the hash list for overlapping entries and
* coalesce.
*/
for(; nfsd && NFSW_CONTIG(owp, nfsd); nfsd = wp) {
wp = LIST_NEXT(nfsd, nd_hash);
if (nfsrv_samecred(owp->nd_cr, nfsd->nd_cr))
nfsrvw_coalesce(owp, nfsd);
}
} else {
LIST_INSERT_HEAD(wpp, nfsd, nd_hash);
}
}
mutex_exit(&nfsd_lock);
}

/*
* Now, do VOP_WRITE()s for any one(s) that need to be done now
* and generate the associated reply mbuf list(s).
*/
loop1:
getmicrotime(&now);
cur_usec = (u_quad_t)now.tv_sec * 1000000 + (u_quad_t)now.tv_usec;
mutex_enter(&nfsd_lock);
for (nfsd = LIST_FIRST(&slp->ns_tq); nfsd; nfsd = owp) {
owp = LIST_NEXT(nfsd, nd_tq);
if (nfsd->nd_time > cur_usec)
break;
if (nfsd->nd_mreq)
continue;
LIST_REMOVE(nfsd, nd_tq);
LIST_REMOVE(nfsd, nd_hash);
mutex_exit(&nfsd_lock);

mrep = nfsd->nd_mrep;
nfsd->nd_mrep = NULL;
cred = nfsd->nd_cr;
v3 = (nfsd->nd_flag & ND_NFSV3);
forat_ret = aftat_ret = 1;
error = nfsrv_fhtovp(&nfsd->nd_fh, 1, &vp, cred, slp,
nfsd->nd_nam, &rdonly, (nfsd->nd_flag & ND_KERBAUTH),
false);
if (!error) {
if (v3)
forat_ret = VOP_GETATTR(vp, &forat, cred);
if (vp->v_type != VREG) {
if (v3)
error = EINVAL;
else
error = (vp->v_type == VDIR) ? EISDIR : EACCES;
}
} else
vp = NULL;
if (!error) {
nqsrv_getl(vp, ND_WRITE);
error = nfsrv_access(vp, VWRITE, cred, rdonly, lwp, 1);
}

if (nfsd->nd_stable == NFSV3WRITE_UNSTABLE)
ioflags = IO_NODELOCKED;
else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC)
ioflags = (IO_SYNC | IO_NODELOCKED);
else
ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED);
uiop->uio_rw = UIO_WRITE;
uiop->uio_offset = nfsd->nd_off;
uiop->uio_resid = nfsd->nd_eoff - nfsd->nd_off;
UIO_SETUP_SYSSPACE(uiop);
if (uiop->uio_resid > 0) {
mp = mrep;
i = 0;
while (mp) {
if (mp->m_len > 0)
i++;
mp = mp->m_next;
}
uiop->uio_iovcnt = i;
iov = malloc(i * sizeof (struct iovec), M_TEMP, M_WAITOK);
uiop->uio_iov = ivp = iov;
mp = mrep;
while (mp) {
if (mp->m_len > 0) {
ivp->iov_base = mtod(mp, void *);
ivp->iov_len = mp->m_len;
ivp++;
}
mp = mp->m_next;
}
if (!error) {
error = VOP_WRITE(vp, uiop, ioflags, cred);
nfsstats.srvvop_writes++;
}
free((void *)iov, M_TEMP);
}
m_freem(mrep);
if (vp) {
aftat_ret = VOP_GETATTR(vp, &va, cred);
vput(vp);
}

/*
* Loop around generating replies for all write rpcs that have
* now been completed.
*/
swp = nfsd;
do {
if (error) {
nfsm_writereply(NFSX_WCCDATA(v3), v3);
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
}
} else {
nfsm_writereply(NFSX_PREOPATTR(v3) +
NFSX_POSTOPORFATTR(v3) + 2 * NFSX_UNSIGNED +
NFSX_WRITEVERF(v3), v3);
if (v3) {
nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, &va);
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(nfsd->nd_len);
*tl++ = txdr_unsigned(swp->nd_stable);
/*
* Actually, there is no need to txdr these fields,
* but it may make the values more human readable,
* for debugging purposes.
*/
struct timeval btv;
getmicroboottime(&btv);
*tl++ = txdr_unsigned(btv.tv_sec);
*tl = txdr_unsigned(btv.tv_usec);
} else {
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
}
nfsd->nd_mreq = mreq;
if (nfsd->nd_mrep)
panic("nfsrv_write: nd_mrep not free");

/*
* Done. Put it at the head of the timer queue so that
* the final phase can return the reply.
*/
mutex_enter(&nfsd_lock);
if (nfsd != swp) {
nfsd->nd_time = 0;
LIST_INSERT_HEAD(&slp->ns_tq, nfsd, nd_tq);
}
nfsd = LIST_FIRST(&swp->nd_coalesce);
if (nfsd) {
LIST_REMOVE(nfsd, nd_tq);
}
mutex_exit(&nfsd_lock);
} while (nfsd);
swp->nd_time = 0;

mutex_enter(&nfsd_lock);
LIST_INSERT_HEAD(&slp->ns_tq, swp, nd_tq);
mutex_exit(&nfsd_lock);
goto loop1;
}
mutex_exit(&nfsd_lock);
nfs_timer_start();

/*
* Search for a reply to return.
*/
mutex_enter(&nfsd_lock);
LIST_FOREACH(nfsd, &slp->ns_tq, nd_tq) {
if (nfsd->nd_mreq) {
LIST_REMOVE(nfsd, nd_tq);
*mrq = nfsd->nd_mreq;
*ndp = nfsd;
break;
}
}
mutex_exit(&nfsd_lock);
return (0);
}

/*
* Coalesce the write request nfsd into owp. To do this we must:
* - remove nfsd from the queues
* - merge nfsd->nd_mrep into owp->nd_mrep
* - update the nd_eoff and nd_stable for owp
* - put nfsd on owp's nd_coalesce list
* NB: Must be called at splsoftclock().
*/
void
nfsrvw_coalesce(struct nfsrv_descript *owp, struct nfsrv_descript *nfsd)
{
int overlap;
struct mbuf *mp;
struct nfsrv_descript *m;

KASSERT(mutex_owned(&nfsd_lock));

LIST_REMOVE(nfsd, nd_hash);
LIST_REMOVE(nfsd, nd_tq);
if (owp->nd_eoff < nfsd->nd_eoff) {
overlap = owp->nd_eoff - nfsd->nd_off;
if (overlap < 0)
panic("nfsrv_coalesce: bad off");
if (overlap > 0)
m_adj(nfsd->nd_mrep, overlap);
mp = owp->nd_mrep;
while (mp->m_next)
mp = mp->m_next;
mp->m_next = nfsd->nd_mrep;
owp->nd_eoff = nfsd->nd_eoff;
} else
m_freem(nfsd->nd_mrep);
nfsd->nd_mrep = NULL;
if (nfsd->nd_stable == NFSV3WRITE_FILESYNC)
owp->nd_stable = NFSV3WRITE_FILESYNC;
else if (nfsd->nd_stable == NFSV3WRITE_DATASYNC &&
owp->nd_stable == NFSV3WRITE_UNSTABLE)
owp->nd_stable = NFSV3WRITE_DATASYNC;
LIST_INSERT_HEAD(&owp->nd_coalesce, nfsd, nd_tq);
/*
* nfsd might hold coalesce elements! Move them to owp.
* Otherwise, requests may be lost and clients will be stuck.
*/
while ((m = LIST_FIRST(&nfsd->nd_coalesce)) != NULL) {
LIST_REMOVE(m, nd_tq);
LIST_INSERT_HEAD(&owp->nd_coalesce, m, nd_tq);
}
}

/*
* nfs create service
* now does a truncate to 0 length via. setattr if it already exists
*/
int
nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct nfs_fattr *fp;
struct vattr va, dirfor, diraft;
struct nfsv2_sattr *sp;
u_int32_t *tl;
struct nameidata nd;
char *cp;
int32_t t1;
char *bpos;
int error = 0, cache = 0, len, tsize, dirfor_ret = 1, diraft_ret = 1;
int rdev = 0, abort = 0;
int v3 = (nfsd->nd_flag & ND_NFSV3), how, exclusive_flag = 0;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp = NULL, *dirp = NULL;
nfsrvfh_t nsfh;
u_quad_t frev, tempsize;
u_char cverf[NFSX_V3CREATEVERF];

nd.ni_cnd.cn_nameiop = 0;
nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_WCCDATA(v3));
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
if (dirp)
vrele(dirp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
return (0);
}
abort = 1;
vattr_null(&va);
if (v3) {
va.va_mode = 0;
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
how = fxdr_unsigned(int, *tl);
switch (how) {
case NFSV3CREATE_GUARDED:
if (nd.ni_vp) {
error = EEXIST;
break;
}
/* FALLTHROUGH */
case NFSV3CREATE_UNCHECKED:
nfsm_srvsattr(&va);
break;
case NFSV3CREATE_EXCLUSIVE:
nfsm_dissect(cp, void *, NFSX_V3CREATEVERF);
memcpy(cverf, cp, NFSX_V3CREATEVERF);
exclusive_flag = 1;
break;
};
va.va_type = VREG;
} else {
nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
va.va_type = IFTOVT(fxdr_unsigned(u_int32_t, sp->sa_mode));
if (va.va_type == VNON)
va.va_type = VREG;
va.va_mode = nfstov_mode(sp->sa_mode);
switch (va.va_type) {
case VREG:
tsize = fxdr_unsigned(int32_t, sp->sa_size);
if (tsize != -1)
va.va_size = (u_quad_t)tsize;
break;
case VCHR:
case VBLK:
case VFIFO:
rdev = fxdr_unsigned(int32_t, sp->sa_size);
break;
default:
break;
};
}

/*
* Iff doesn't exist, create it
* otherwise just truncate to 0 length
* should I set the mode too ??
*/
if (nd.ni_vp == NULL) {
if (va.va_type == VREG || va.va_type == VSOCK) {
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va);
if (!error) {
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
if (exclusive_flag) {
exclusive_flag = 0;
vattr_null(&va);
/*
* XXX
* assuming NFSX_V3CREATEVERF
* == sizeof(nfstime3)
*/
fxdr_nfsv3time(cverf, &va.va_atime);
error = VOP_SETATTR(nd.ni_vp, &va,
cred);
}
}
} else if (va.va_type == VCHR || va.va_type == VBLK ||
va.va_type == VFIFO) {
if (va.va_type == VCHR && rdev == 0xffffffff)
va.va_type = VFIFO;
if (va.va_type != VFIFO &&
(error = kauth_authorize_system(cred,
KAUTH_SYSTEM_MKNOD, 0, NULL, NULL, NULL))) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
abort = 0;
nfsm_reply(0);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
return (error);
} else
va.va_rdev = (dev_t)rdev;
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd,
&va);
if (!error) {
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
} else {
nfsm_reply(0);
}
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
error = ENXIO;
abort = 0;
}
vp = nd.ni_vp;
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
vp = nd.ni_vp;
abort = 0;
if (!error && va.va_size != -1) {
error = nfsrv_access(vp, VWRITE, cred,
(nd.ni_cnd.cn_flags & RDONLY), lwp, 0);
if (!error) {
nqsrv_getl(vp, ND_WRITE);
tempsize = va.va_size;
vattr_null(&va);
va.va_size = tempsize;
error = VOP_SETATTR(vp, &va, cred);
}
}
if (error)
vput(vp);
}
if (!error) {
error = nfsrv_composefh(vp, &nsfh, v3);
if (!error)
error = VOP_GETATTR(vp, &va, cred);
vput(vp);
}
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (v3) {
if (exclusive_flag && !error) {
/*
* XXX assuming NFSX_V3CREATEVERF == sizeof(nfstime3)
*/
char oldverf[NFSX_V3CREATEVERF];

txdr_nfsv3time(&va.va_atime, oldverf);
if (memcmp(cverf, oldverf, NFSX_V3CREATEVERF))
error = EEXIST;
}
if (dirp) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
}
if (dirp) {
vrele(dirp);
dirp = NULL;
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
abort = 0;
nfsm_reply(NFSX_SRVFH(&nsfh, v3) + NFSX_FATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(&nsfh);
nfsm_srvpostop_attr(0, &va);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
} else {
nfsm_srvfhtom(&nsfh, v3);
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
return (0);
nfsmout:
if (dirp)
vrele(dirp);
if (abort) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vput(nd.ni_vp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
}
return (error);
}

/*
* nfs v3 mknod service
*/
int
nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
u_int32_t *tl;
struct nameidata nd;
int32_t t1;
char *bpos;
int error = 0, cache = 0, len, dirfor_ret = 1, diraft_ret = 1;
int abort = 0;
u_int32_t major, minor;
enum vtype vtyp;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp, *dirp = (struct vnode *)0;
nfsrvfh_t nsfh;
u_quad_t frev;

nd.ni_cnd.cn_nameiop = 0;
nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, &dirfor_ret, &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_WCCDATA(1));
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
if (dirp)
vrele(dirp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
return (0);
}
abort = 1;
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
vtyp = nfsv3tov_type(*tl);
if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
error = NFSERR_BADTYPE;
goto abort;
}
vattr_null(&va);
va.va_mode = 0;
nfsm_srvsattr(&va);
if (vtyp == VCHR || vtyp == VBLK) {
dev_t rdev;

nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
major = fxdr_unsigned(u_int32_t, *tl++);
minor = fxdr_unsigned(u_int32_t, *tl);
rdev = makedev(major, minor);
if (major(rdev) != major || minor(rdev) != minor) {
error = EINVAL;
goto abort;
}
va.va_rdev = rdev;
}

/*
* Iff doesn't exist, create it.
*/
if (nd.ni_vp) {
error = EEXIST;
abort:
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_vp)
vput(nd.ni_vp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
goto out;
}
va.va_type = vtyp;
if (vtyp == VSOCK) {
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va);
} else {
if (va.va_type != VFIFO &&
(error = kauth_authorize_system(cred,
KAUTH_SYSTEM_MKNOD, 0, NULL, NULL, NULL))) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
vput(nd.ni_dvp);
goto out;
}
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va);
if (error)
goto out;
}
if (!error) {
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
}
out:
vp = nd.ni_vp;
if (!error) {
error = nfsrv_composefh(vp, &nsfh, true);
if (!error)
error = VOP_GETATTR(vp, &va, cred);
vput(vp);
}
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (dirp) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
vrele(dirp);
dirp = NULL;
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
abort = 0;
nfsm_reply(NFSX_SRVFH(&nsfh, true) + NFSX_POSTOPATTR(1) +
NFSX_WCCDATA(1));
if (!error) {
nfsm_srvpostop_fh(&nsfh);
nfsm_srvpostop_attr(0, &va);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
return (0);
nfsmout:
if (abort) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vput(nd.ni_vp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
}
if (dirp)
vrele(dirp);
return (error);
}

/*
* nfs remove service
*/
int
nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct nameidata nd;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, cache = 0, len, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp, *dirp;
struct vattr dirfor, diraft;
nfsrvfh_t nsfh;
u_quad_t frev;

#ifndef nolint
vp = (struct vnode *)0;
#endif
nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = DELETE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (!error) {
vp = nd.ni_vp;
if (vp->v_type == VDIR) {
error = EPERM;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_vflag & VV_ROOT) {
error = EBUSY;
}
out:
if (!error) {
nqsrv_getl(nd.ni_dvp, ND_WRITE);
nqsrv_getl(vp, ND_WRITE);
error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
vput(nd.ni_dvp);
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
vrele(dirp);
}
nfsm_reply(NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
return (0);
}
nfsm_srvdone;
}

/*
* nfs rename service
*/
int
nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, cache = 0, fdirfor_ret = 1, fdiraft_ret = 1;
uint32_t len, len2;
int tdirfor_ret = 1, tdiraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct nameidata fromnd, tond;
struct vnode *fvp, *tvp, *tdvp;
struct vnode *fdirp = NULL, *tdirp = NULL;
struct mount *localfs = NULL;
struct vattr fdirfor, fdiraft, tdirfor, tdiraft;
nfsrvfh_t fnsfh, tnsfh;
u_quad_t frev;
uid_t saved_uid;

#ifndef nolint
fvp = (struct vnode *)0;
#endif
fromnd.ni_cnd.cn_nameiop = 0;
tond.ni_cnd.cn_nameiop = 0;
nfsm_srvmtofh(&fnsfh);
nfsm_srvnamesiz(len);
/*
* Remember our original uid so that we can reset cr_uid before
* the second nfs_namei() call, in case it is remapped.
*/
saved_uid = kauth_cred_geteuid(cred);
fromnd.ni_cnd.cn_cred = cred;
fromnd.ni_cnd.cn_nameiop = DELETE;
fromnd.ni_cnd.cn_flags = LOCKPARENT;
error = nfs_namei(&fromnd, &fnsfh, len, slp, nam, &md,
&dpos, &fdirp, (v3 ? &fdirfor_ret : NULL), &fdirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
fromnd.ni_cnd.cn_nameiop = 0;
nfsm_reply(2 * NFSX_WCCDATA(v3));
nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
if (fdirp)
vrele(fdirp);
if (fromnd.ni_pathbuf != NULL) {
pathbuf_destroy(fromnd.ni_pathbuf);
}
return (0);
}
localfs = fromnd.ni_dvp->v_mount;
fstrans_start(localfs);
if (fromnd.ni_dvp != fromnd.ni_vp) {
VOP_UNLOCK(fromnd.ni_dvp);
}
fvp = fromnd.ni_vp;

error = VFS_RENAMELOCK_ENTER(localfs);
if (error) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
goto out1;
}

/* Copied, regrettably, from vfs_syscalls.c (q.v.) */
vrele(fvp);
if ((fromnd.ni_cnd.cn_namelen == 1 &&
fromnd.ni_cnd.cn_nameptr[0] == '.') ||
(fromnd.ni_cnd.cn_namelen == 2 &&
fromnd.ni_cnd.cn_nameptr[0] == '.' &&
fromnd.ni_cnd.cn_nameptr[1] == '.')) {
error = EINVAL;
VFS_RENAMELOCK_EXIT(localfs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
goto out1;
}
vn_lock(fromnd.ni_dvp, LK_EXCLUSIVE | LK_RETRY);
error = relookup(fromnd.ni_dvp, &fromnd.ni_vp, &fromnd.ni_cnd, 0);
if (error) {
VOP_UNLOCK(fromnd.ni_dvp);
VFS_RENAMELOCK_EXIT(localfs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
goto out1;
}
VOP_UNLOCK(fromnd.ni_vp);
if (fromnd.ni_dvp != fromnd.ni_vp)
VOP_UNLOCK(fromnd.ni_dvp);
fvp = fromnd.ni_vp;

nfsm_srvmtofh(&tnsfh);
if (v3) {
nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED);
len2 = fxdr_unsigned(uint32_t, *tl);
/* len2 will be checked by nfs_namei */
}
else {
/* NFSv2 */
nfsm_strsiz(len2, NFS_MAXNAMLEN);
}
kauth_cred_seteuid(cred, saved_uid);
tond.ni_cnd.cn_cred = cred;
tond.ni_cnd.cn_nameiop = RENAME;
tond.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | NOCACHE;
error = nfs_namei(&tond, &tnsfh, len2, slp, nam, &md,
&dpos, &tdirp, (v3 ? &tdirfor_ret : NULL), &tdirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
VFS_RENAMELOCK_EXIT(localfs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
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) {
if (v3)
error = EEXIST;
else
error = EISDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
if (v3)
error = EEXIST;
else
error = ENOTDIR;
goto out;
}
if (tvp->v_type == VDIR && tvp->v_mountedhere) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
}
if (fvp->v_type == VDIR && fvp->v_mountedhere) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
if (fvp->v_mount != tdvp->v_mount) {
if (v3)
error = EXDEV;
else
error = ENOTEMPTY;
goto out;
}
if (fvp == tdvp) {
if (v3)
error = EINVAL;
else
error = ENOTEMPTY;
}
/*
* 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_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
!memcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
fromnd.ni_cnd.cn_namelen))
error = -1;
out:
if (!error) {
nqsrv_getl(fromnd.ni_dvp, ND_WRITE);
nqsrv_getl(tdvp, ND_WRITE);
if (tvp) {
nqsrv_getl(tvp, ND_WRITE);
}
error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
VFS_RENAMELOCK_EXIT(localfs);
} else {
VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VFS_RENAMELOCK_EXIT(localfs);
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
vrele(fromnd.ni_dvp);
vrele(fvp);
if (error == -1)
error = 0;
}
if (tond.ni_pathbuf != NULL) {
pathbuf_destroy(tond.ni_pathbuf);
tond.ni_pathbuf = NULL;
}
tond.ni_cnd.cn_nameiop = 0;
out1:
if (fdirp) {
if (v3) {
vn_lock(fdirp, LK_SHARED | LK_RETRY);
fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft, cred);
VOP_UNLOCK(fdirp);
}
vrele(fdirp);
fdirp = NULL;
}
if (tdirp) {
if (v3) {
vn_lock(tdirp, LK_SHARED | LK_RETRY);
tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft, cred);
VOP_UNLOCK(tdirp);
}
vrele(tdirp);
tdirp = NULL;
}
pathbuf_destroy(fromnd.ni_pathbuf);
fromnd.ni_pathbuf = NULL;
fromnd.ni_cnd.cn_nameiop = 0;
fstrans_done(localfs);
localfs = NULL;
nfsm_reply(2 * NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft);
nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft);
}
return (0);

nfsmout:
if (fdirp)
vrele(fdirp);
#ifdef notdef
if (tdirp)
vrele(tdirp);
#endif
if (tond.ni_cnd.cn_nameiop) {
if (tond.ni_pathbuf != NULL) {
pathbuf_destroy(tond.ni_pathbuf);
tond.ni_pathbuf = NULL;
}
}
if (localfs) {
VFS_RENAMELOCK_EXIT(localfs);
fstrans_done(localfs);
}
if (fromnd.ni_cnd.cn_nameiop) {
VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
if (fromnd.ni_pathbuf != NULL) {
pathbuf_destroy(fromnd.ni_pathbuf);
fromnd.ni_pathbuf = NULL;
}
vrele(fromnd.ni_dvp);
vrele(fvp);
}
return (error);
}

/*
* nfs link service
*/
int
nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct nameidata nd;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, len, dirfor_ret = 1, diraft_ret = 1;
int getret = 1, v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp, *xp, *dirp = (struct vnode *)0;
struct vattr dirfor, diraft, at;
nfsrvfh_t nsfh, dnsfh;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
nfsm_srvmtofh(&dnsfh);
nfsm_srvnamesiz(len);
error = nfsrv_fhtovp(&nsfh, false, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
nfsm_srvpostop_attr(getret, &at);
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
return (0);
}
if (vp->v_type == VDIR) {
error = EPERM;
goto out1;
}
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT;
error = nfs_namei(&nd, &dnsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error)
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) {
nqsrv_getl(vp, ND_WRITE);
nqsrv_getl(xp, ND_WRITE);
error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
if (nd.ni_dvp != nd.ni_vp)
VOP_UNLOCK(nd.ni_dvp);
vrele(nd.ni_dvp);
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
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:
if (v3) {
vn_lock(vp, LK_SHARED | LK_RETRY);
getret = VOP_GETATTR(vp, &at, cred);
VOP_UNLOCK(vp);
}
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
vrele(dirp);
}
vrele(vp);
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvpostop_attr(getret, &at);
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
return (0);
}
nfsm_srvdone;
}

/*
* nfs symbolic link service
*/
int
nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
struct nameidata nd;
u_int32_t *tl;
int32_t t1;
struct nfsv2_sattr *sp;
char *bpos, *pathcp = NULL, *cp2;
struct uio io;
struct iovec iv;
int error = 0, cache = 0, dirfor_ret = 1, diraft_ret = 1, abort = 0;
uint32_t len, len2;
int v3 = (nfsd->nd_flag & ND_NFSV3);
struct mbuf *mb, *mreq __unused;
struct vnode *dirp = (struct vnode *)0;
nfsrvfh_t nsfh;
u_quad_t frev;

nd.ni_cnd.cn_nameiop = 0;
nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error)
goto out;
abort = 1;
vattr_null(&va);
va.va_type = VLNK;
if (v3) {
va.va_mode = 0;
nfsm_srvsattr(&va);
nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED);
len2 = fxdr_unsigned(uint32_t, *tl);
if (len2 > PATH_MAX) {
/* XXX should check _PC_NO_TRUNC */
error = ENAMETOOLONG;
goto abortop;
}
}
else {
/* NFSv2 */
nfsm_strsiz(len2, NFS_MAXPATHLEN);
}
pathcp = malloc(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_rw = UIO_READ;
UIO_SETUP_SYSSPACE(&io);
nfsm_mtouio(&io, len2);
if (!v3) {
nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
va.va_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
}
*(pathcp + len2) = '\0';
if (nd.ni_vp) {
error = EEXIST;
abortop:
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp)
vrele(nd.ni_vp);
goto out;
}
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va, pathcp);
if (!error) {
if (v3) {
vn_lock(nd.ni_vp, LK_SHARED | LK_RETRY);
error = nfsrv_composefh(nd.ni_vp, &nsfh, v3);
if (!error)
error = VOP_GETATTR(nd.ni_vp, &va, cred);
vput(nd.ni_vp);
} else {
vrele(nd.ni_vp);
}
}
vput(nd.ni_dvp);
out:
if (pathcp)
free(pathcp, M_TEMP);
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
vrele(dirp);
dirp = NULL;
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
abort = 0;
nfsm_reply(NFSX_SRVFH(&nsfh, v3) + NFSX_POSTOPATTR(v3) +
NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(&nsfh);
nfsm_srvpostop_attr(0, &va);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
}
return (0);
nfsmout:
if (abort) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
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 (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
}
if (dirp)
vrele(dirp);
if (pathcp)
free(pathcp, M_TEMP);
return (error);
}

/*
* nfs mkdir service
*/
int
nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vattr va, dirfor, diraft;
struct nfs_fattr *fp;
struct nameidata nd;
char *cp;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, cache = 0, len, dirfor_ret = 1, diraft_ret = 1;
int abort = 0;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp, *dirp = (struct vnode *)0;
nfsrvfh_t nsfh;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = CREATE;
nd.ni_cnd.cn_flags = LOCKPARENT;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
nfsm_reply(NFSX_WCCDATA(v3));
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
if (dirp)
vrele(dirp);
return (0);
}
abort = 1;
vattr_null(&va);
if (v3) {
va.va_mode = 0;
nfsm_srvsattr(&va);
} else {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
va.va_mode = nfstov_mode(*tl++);
}
va.va_type = VDIR;
vp = nd.ni_vp;
if (vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(vp);
error = EEXIST;
goto out;
}
nqsrv_getl(nd.ni_dvp, ND_WRITE);
error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &va);
if (!error) {
vp = nd.ni_vp;
vn_lock(vp, LK_SHARED | LK_RETRY);
error = nfsrv_composefh(vp, &nsfh, v3);
if (!error)
error = VOP_GETATTR(vp, &va, cred);
vput(vp);
}
vput(nd.ni_dvp);
out:
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
vrele(dirp);
dirp = NULL;
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
abort = 0;
nfsm_reply(NFSX_SRVFH(&nsfh, v3) + NFSX_POSTOPATTR(v3) +
NFSX_WCCDATA(v3));
if (v3) {
if (!error) {
nfsm_srvpostop_fh(&nsfh);
nfsm_srvpostop_attr(0, &va);
}
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
} else {
nfsm_srvfhtom(&nsfh, v3);
nfsm_build(fp, struct nfs_fattr *, NFSX_V2FATTR);
nfsm_srvfillattr(&va, fp);
}
return (0);
nfsmout:
if (abort) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
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 (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
}
if (dirp)
vrele(dirp);
return (error);
}

/*
* nfs rmdir service
*/
int
nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, cache = 0, len, dirfor_ret = 1, diraft_ret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp, *dirp = (struct vnode *)0;
struct vattr dirfor, diraft;
nfsrvfh_t nsfh;
struct nameidata nd;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
nfsm_srvnamesiz(len);
nd.ni_cnd.cn_cred = cred;
nd.ni_cnd.cn_nameiop = DELETE;
nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
error = nfs_namei(&nd, &nsfh, len, slp, nam, &md, &dpos,
&dirp, (v3 ? &dirfor_ret : NULL), &dirfor,
lwp, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
nfsm_reply(NFSX_WCCDATA(v3));
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
if (dirp)
vrele(dirp);
return (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_vflag & VV_ROOT)
error = EBUSY;
out:
if (!error) {
nqsrv_getl(nd.ni_dvp, ND_WRITE);
nqsrv_getl(vp, ND_WRITE);
error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
vput(nd.ni_dvp);
} else {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vput(vp);
}
if (nd.ni_pathbuf != NULL) {
pathbuf_destroy(nd.ni_pathbuf);
nd.ni_pathbuf = NULL;
}
if (dirp) {
if (v3) {
vn_lock(dirp, LK_SHARED | LK_RETRY);
diraft_ret = VOP_GETATTR(dirp, &diraft, cred);
VOP_UNLOCK(dirp);
}
vrele(dirp);
}
nfsm_reply(NFSX_WCCDATA(v3));
if (v3) {
nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft);
return (0);
}
nfsm_srvdone;
}

/*
* nfs readdir service
* - mallocs what it thinks is enough to read
* count rounded up to a multiple of NFS_SRVDIRBLKSIZ <= 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_fileno == 0
* this doesn't matter for Unix clients, but they might confuse clients
* for other os'.
* - it trims out records with d_type == DT_WHT
* these cannot be seen through NFS (unless we extend the protocol)
* 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 }
* The alternate call nfsrv_readdirplus() does lookups as well.
* 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.
*/

#define NFS_SRVDIRBLKSIZ 1024

struct flrep {
nfsuint64 fl_off;
u_int32_t fl_postopok;
struct nfs_fattr fl_fattr; /* XXX: must be of fattr3 size */
u_int32_t fl_fhok;
u_int32_t fl_fhsize;
/* handle comes here, filled in dynamically */
};

int
nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
char *bp, *be;
struct mbuf *mp;
struct dirent *dp;
char *cp;
u_int32_t *tl;
int32_t t1;
char *bpos;
struct mbuf *mb, *mreq __unused, *mp2;
char *cpos, *cend, *cp2, *rbuf;
struct vnode *vp;
struct vattr at;
nfsrvfh_t nsfh;
struct uio io;
struct iovec iv;
int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
int siz, cnt, fullsiz, eofflag, rdonly, cache = 0, ncookies;
int v3 = (nfsd->nd_flag & ND_NFSV3);
u_quad_t frev, off, toff;
#ifdef NFS3_STRICTVERF
u_quad_t verf;
#endif
off_t *cookies = NULL, *cookiep;
nfsuint64 jar;

nfsm_srvmtofh(&nsfh);
if (v3) {
nfsm_dissect(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
toff = fxdr_hyper(tl);
tl += 2;
#ifdef NFS3_STRICTVERF
verf = fxdr_hyper(tl);
#endif
tl += 2;
} else {
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
toff = fxdr_unsigned(u_quad_t, *tl++);
}
off = toff;
cnt = fxdr_unsigned(int, *tl);
siz = ((cnt + NFS_SRVDIRBLKSIZ - 1) & ~(NFS_SRVDIRBLKSIZ - 1));
xfer = NFS_SRVMAXDATA(nfsd);
if (siz > xfer)
siz = xfer;
fullsiz = siz;
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
nqsrv_getl(vp, ND_READ);
if (v3) {
error = getret = VOP_GETATTR(vp, &at, cred);
#ifdef NFS3_STRICTVERF
/*
* XXX This check is too strict for Solaris 2.5 clients.
*/
if (!error && toff && verf != at.va_filerev)
error = NFSERR_BAD_COOKIE;
#endif
}
if (!error)
error = nfsrv_access(vp, VEXEC, cred, rdonly, lwp, 0);
if (error) {
vput(vp);
nfsm_reply(NFSX_POSTOPATTR(v3));
nfsm_srvpostop_attr(getret, &at);
return (0);
}
VOP_UNLOCK(vp);
rbuf = malloc(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_t)off;
io.uio_resid = fullsiz;
io.uio_rw = UIO_READ;
UIO_SETUP_SYSSPACE(&io);
eofflag = 0;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

error = VOP_READDIR(vp, &io, cred, &eofflag, &cookies, &ncookies);

off = (off_t)io.uio_offset;
if (!cookies && !error)
error = NFSERR_PERM;
if (v3) {
getret = VOP_GETATTR(vp, &at, cred);
if (!error)
error = getret;
}

VOP_UNLOCK(vp);
if (error) {
vrele(vp);
free((void *)rbuf, M_TEMP);
if (cookies)
free((void *)cookies, M_TEMP);
nfsm_reply(NFSX_POSTOPATTR(v3));
nfsm_srvpostop_attr(getret, &at);
return (0);
}
if (io.uio_resid) {
siz -= io.uio_resid;

/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) +
2 * NFSX_UNSIGNED);
if (v3) {
nfsm_srvpostop_attr(getret, &at);
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
tl += 2;
} else
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = nfs_false;
*tl = nfs_true;
free((void *)rbuf, M_TEMP);
free((void *)cookies, M_TEMP);
return (0);
}
}

/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;

while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT)) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
toff = off;
siz = fullsiz;
free(cookies, M_TEMP);
cookies = NULL;
goto again;
}

len = 3 * NFSX_UNSIGNED; /* paranoia, probably can be 0 */
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) + siz);
if (v3) {
nfsm_srvpostop_attr(getret, &at);
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
}
mp = mp2 = mb;
bp = bpos;
be = bp + M_TRAILINGSPACE(mp);

/* Loop through the records and build reply */
while (cpos < cend && ncookies > 0) {
if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
nlen = dp->d_namlen;
rem = nfsm_rndup(nlen)-nlen;
len += (4 * NFSX_UNSIGNED + nlen + rem);
if (v3)
len += 2 * NFSX_UNSIGNED;
if (len > cnt) {
eofflag = 0;
break;
}
/*
* Build the directory record xdr from
* the dirent entry.
*/
nfsm_clget;
*tl = nfs_true;
bp += NFSX_UNSIGNED;
if (v3) {
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno >> 32);
bp += NFSX_UNSIGNED;
}
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;

/* And loop around copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp+xfer) > be)
tsiz = be-bp;
else
tsiz = xfer;
memcpy(bp, cp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to an int32_t boundary */
for (i = 0; i < rem; i++)
*bp++ = '\0';
nfsm_clget;

/* Finish off the record */
txdr_hyper(*cookiep, &jar);
if (v3) {
*tl = jar.nfsuquad[0];
bp += NFSX_UNSIGNED;
nfsm_clget;
}
*tl = jar.nfsuquad[1];
bp += NFSX_UNSIGNED;
}
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
vrele(vp);
nfsm_clget;
*tl = nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
if (eofflag)
*tl = nfs_true;
else
*tl = nfs_false;
bp += NFSX_UNSIGNED;
if (mp != mb) {
if (bp < be)
mp->m_len = bp - mtod(mp, char *);
} else
mp->m_len += bp - bpos;
free((void *)rbuf, M_TEMP);
free((void *)cookies, M_TEMP);
nfsm_srvdone;
}

int
nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
char *bp, *be;
struct mbuf *mp;
struct dirent *dp;
char *cp;
u_int32_t *tl;
int32_t t1;
char *bpos;
struct mbuf *mb, *mreq __unused, *mp2;
char *cpos, *cend, *cp2, *rbuf;
struct vnode *vp, *nvp;
struct flrep fl;
nfsrvfh_t nsfh;
struct uio io;
struct iovec iv;
struct vattr va, at, *vap = &va;
struct nfs_fattr *fp;
int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1;
int siz, cnt, fullsiz, eofflag, rdonly, cache = 0, dirlen, ncookies;
u_quad_t frev, off, toff;
#ifdef NFS3_STRICTVERF
u_quad_t verf;
#endif
off_t *cookies = NULL, *cookiep;

nfsm_srvmtofh(&nsfh);
nfsm_dissect(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
toff = fxdr_hyper(tl);
tl += 2;
#ifdef NFS3_STRICTVERF
verf = fxdr_hyper(tl);
#endif
tl += 2;
siz = fxdr_unsigned(int, *tl++);
cnt = fxdr_unsigned(int, *tl);
off = toff;
siz = ((siz + NFS_SRVDIRBLKSIZ - 1) & ~(NFS_SRVDIRBLKSIZ - 1));
xfer = NFS_SRVMAXDATA(nfsd);
if (siz > xfer)
siz = xfer;
fullsiz = siz;
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
error = getret = VOP_GETATTR(vp, &at, cred);
#ifdef NFS3_STRICTVERF
/*
* XXX This check is too strict for Solaris 2.5 clients.
*/
if (!error && toff && verf != at.va_filerev)
error = NFSERR_BAD_COOKIE;
#endif
if (!error) {
nqsrv_getl(vp, ND_READ);
error = nfsrv_access(vp, VEXEC, cred, rdonly, lwp, 0);
}
if (error) {
vput(vp);
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
VOP_UNLOCK(vp);

rbuf = malloc(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_t)off;
io.uio_resid = fullsiz;
io.uio_rw = UIO_READ;
UIO_SETUP_SYSSPACE(&io);
eofflag = 0;

vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);

error = VOP_READDIR(vp, &io, cred, &eofflag, &cookies, &ncookies);

off = (u_quad_t)io.uio_offset;
getret = VOP_GETATTR(vp, &at, cred);

VOP_UNLOCK(vp);

/*
* If the VGET operation doesn't work for this filesystem,
* we can't support readdirplus. Returning NOTSUPP should
* make clients fall back to plain readdir.
* There's no need to check for VPTOFH as well, we wouldn't
* even be here otherwise.
*/
if (!getret) {
if ((getret = VFS_VGET(vp->v_mount, at.va_fileid,
LK_EXCLUSIVE, &nvp)))
getret = (getret == EOPNOTSUPP) ?
NFSERR_NOTSUPP : NFSERR_IO;
else
vput(nvp);
}

if (!cookies && !error)
error = NFSERR_PERM;
if (!error)
error = getret;
if (error) {
vrele(vp);
if (cookies)
free((void *)cookies, M_TEMP);
free((void *)rbuf, M_TEMP);
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
if (io.uio_resid) {
siz -= io.uio_resid;

/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF +
2 * NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
tl += 2;
*tl++ = nfs_false;
*tl = nfs_true;
free((void *)cookies, M_TEMP);
free((void *)rbuf, M_TEMP);
return (0);
}
}

/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;

while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT)) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
toff = off;
siz = fullsiz;
free(cookies, M_TEMP);
cookies = NULL;
goto again;
}

dirlen = len = NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF + 2 * NFSX_UNSIGNED;
nfsm_reply(cnt);
nfsm_srvpostop_attr(getret, &at);
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
txdr_hyper(at.va_filerev, tl);
mp = mp2 = mb;
bp = bpos;
be = bp + M_TRAILINGSPACE(mp);

/* Loop through the records and build reply */
while (cpos < cend && ncookies > 0) {
if (dp->d_fileno != 0 && dp->d_type != DT_WHT) {
nfsrvfh_t nnsfh;

nlen = dp->d_namlen;
rem = nfsm_rndup(nlen)-nlen;

/*
* For readdir_and_lookup get the vnode using
* the file number.
*/
if (VFS_VGET(vp->v_mount, dp->d_fileno, LK_EXCLUSIVE,
&nvp))
goto invalid;
if (nfsrv_composefh(nvp, &nnsfh, true)) {
vput(nvp);
goto invalid;
}
if (VOP_GETATTR(nvp, vap, cred)) {
vput(nvp);
goto invalid;
}
vput(nvp);

/*
* If either the dircount or maxcount will be
* exceeded, get out now. Both of these lengths
* are calculated conservatively, including all
* XDR overheads.
*/
len += (8 * NFSX_UNSIGNED + nlen + rem + NFSX_V3FH +
NFSX_V3POSTOPATTR);
dirlen += (6 * NFSX_UNSIGNED + nlen + rem);
if (len > cnt || dirlen > fullsiz) {
eofflag = 0;
break;
}

/*
* Build the directory record xdr from
* the dirent entry.
*/
fp = (struct nfs_fattr *)&fl.fl_fattr;
nfsm_srvfillattr(vap, fp);
fl.fl_fhsize = txdr_unsigned(NFSX_V3FH);
fl.fl_fhok = nfs_true;
fl.fl_postopok = nfs_true;
txdr_hyper(*cookiep, fl.fl_off.nfsuquad);

nfsm_clget;
*tl = nfs_true;
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno >> 32);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(dp->d_fileno);
bp += NFSX_UNSIGNED;
nfsm_clget;
*tl = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;

/* And loop around copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp + xfer) > be)
tsiz = be - bp;
else
tsiz = xfer;
memcpy(bp, cp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to an int32_t boundary */
for (i = 0; i < rem; i++)
*bp++ = '\0';

/*
* Now copy the flrep structure out.
*/
xfer = sizeof(struct flrep);
cp = (void *)&fl;
while (xfer > 0) {
nfsm_clget;
if ((bp + xfer) > be)
tsiz = be - bp;
else
tsiz = xfer;
memcpy(bp, cp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}

/*
* ... and filehandle.
*/
xfer = NFSRVFH_SIZE(&nnsfh);
cp = NFSRVFH_DATA(&nnsfh);
while (xfer > 0) {
nfsm_clget;
if ((bp + xfer) > be)
tsiz = be - bp;
else
tsiz = xfer;
memcpy(bp, cp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
}
invalid:
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
vrele(vp);
nfsm_clget;
*tl = nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
if (eofflag)
*tl = nfs_true;
else
*tl = nfs_false;
bp += NFSX_UNSIGNED;
if (mp != mb) {
if (bp < be)
mp->m_len = bp - mtod(mp, char *);
} else
mp->m_len += bp - bpos;
free((void *)cookies, M_TEMP);
free((void *)rbuf, M_TEMP);
nfsm_srvdone;
}

/*
* nfs commit service
*/
int
nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct vattr bfor, aft;
struct vnode *vp;
nfsrvfh_t nsfh;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, for_ret = 1, aft_ret = 1, cache = 0;
uint32_t cnt;
char *cp2;
struct mbuf *mb, *mreq __unused;
u_quad_t frev, off, end;

nfsm_srvmtofh(&nsfh);
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);

off = fxdr_hyper(tl);
tl += 2;
cnt = fxdr_unsigned(uint32_t, *tl);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(2 * NFSX_UNSIGNED);
nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
return (0);
}
for_ret = VOP_GETATTR(vp, &bfor, cred);
end = (cnt > 0) ? off + cnt : vp->v_size;
if (end < off || end > vp->v_size)
end = vp->v_size;
if (off < vp->v_size)
error = VOP_FSYNC(vp, cred, FSYNC_WAIT, off, end);
/* else error == 0, from nfsrv_fhtovp() */
aft_ret = VOP_GETATTR(vp, &aft, cred);
vput(vp);
nfsm_reply(NFSX_V3WCCDATA + NFSX_V3WRITEVERF);
nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft);
if (!error) {
nfsm_build(tl, u_int32_t *, NFSX_V3WRITEVERF);
struct timeval btv;
getmicroboottime(&btv);
*tl++ = txdr_unsigned(btv.tv_sec);
*tl = txdr_unsigned(btv.tv_usec);
} else {
return (0);
}
nfsm_srvdone;
}

/*
* nfs statfs service
*/
int
nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
struct statvfs *sf = NULL;
struct nfs_statfs *sfp;
u_int32_t *tl;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, getret = 1;
int v3 = (nfsd->nd_flag & ND_NFSV3);
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp;
struct vattr at;
nfsrvfh_t nsfh;
u_quad_t frev, tval;

nfsm_srvmtofh(&nsfh);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
sf = malloc(sizeof(*sf), M_TEMP, M_WAITOK);
error = VFS_STATVFS(vp->v_mount, sf);
getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_STATFS(v3));
if (v3)
nfsm_srvpostop_attr(getret, &at);
if (error) {
free(sf, M_TEMP);
return (0);
}
nfsm_build(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
if (v3) {
tval = (u_quad_t)((quad_t)sf->f_blocks * (quad_t)sf->f_frsize);
txdr_hyper(tval, &sfp->sf_tbytes);
tval = (u_quad_t)((quad_t)sf->f_bfree * (quad_t)sf->f_frsize);
txdr_hyper(tval, &sfp->sf_fbytes);
tval = (u_quad_t)((quad_t)sf->f_bavail * (quad_t)sf->f_frsize);
txdr_hyper(tval, &sfp->sf_abytes);
tval = (u_quad_t)sf->f_files;
txdr_hyper(tval, &sfp->sf_tfiles);
tval = (u_quad_t)sf->f_ffree;
txdr_hyper(tval, &sfp->sf_ffiles);
txdr_hyper(tval, &sfp->sf_afiles);
sfp->sf_invarsec = 0;
} else {
sfp->sf_tsize = txdr_unsigned(NFS_MAXDGRAMDATA);
sfp->sf_bsize = txdr_unsigned(NFS_V2CLAMP16(sf->f_frsize));
sfp->sf_blocks = txdr_unsigned(NFS_V2CLAMP32(sf->f_blocks));
sfp->sf_bfree = txdr_unsigned(NFS_V2CLAMP32(sf->f_bfree));
sfp->sf_bavail = txdr_unsigned(NFS_V2CLAMP32(sf->f_bavail));
}
nfsmout:
if (sf)
free(sf, M_TEMP);
return error;
}

/*
* nfs fsinfo service
*/
int
nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
u_int32_t *tl;
struct nfsv3_fsinfo *sip;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, getret = 1;
uint32_t maxdata;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp;
struct vattr at;
nfsrvfh_t nsfh;
u_quad_t frev, maxfsize;
struct statvfs *sb;

nfsm_srvmtofh(&nsfh);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
return (0);
}

/* XXX Try to make a guess on the max file size. */
sb = malloc(sizeof(*sb), M_TEMP, M_WAITOK);
VFS_STATVFS(vp->v_mount, sb);
maxfsize = (u_quad_t)0x80000000 * sb->f_frsize - 1;
free(sb, M_TEMP);

getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO);
nfsm_srvpostop_attr(getret, &at);
nfsm_build(sip, struct nfsv3_fsinfo *, NFSX_V3FSINFO);

/*
* XXX
* There should be file system VFS OP(s) to get this information.
* For now, assume ufs.
*/
if (slp->ns_so->so_type == SOCK_DGRAM)
maxdata = NFS_MAXDGRAMDATA;
else
maxdata = NFS_MAXDATA;
sip->fs_rtmax = txdr_unsigned(maxdata);
sip->fs_rtpref = txdr_unsigned(maxdata);
sip->fs_rtmult = txdr_unsigned(NFS_FABLKSIZE);
sip->fs_wtmax = txdr_unsigned(maxdata);
sip->fs_wtpref = txdr_unsigned(maxdata);
sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE);
sip->fs_dtpref = txdr_unsigned(maxdata);
txdr_hyper(maxfsize, &sip->fs_maxfilesize);
sip->fs_timedelta.nfsv3_sec = 0;
sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1);
sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK |
NFSV3FSINFO_SYMLINK | NFSV3FSINFO_HOMOGENEOUS |
NFSV3FSINFO_CANSETTIME);
nfsm_srvdone;
}

/*
* nfs pathconf service
*/
int
nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
struct mbuf *nam = nfsd->nd_nam;
char *dpos = nfsd->nd_dpos;
kauth_cred_t cred = nfsd->nd_cr;
u_int32_t *tl;
struct nfsv3_pathconf *pc;
int32_t t1;
char *bpos;
int error = 0, rdonly, cache = 0, getret = 1;
register_t linkmax, namemax, chownres, notrunc;
char *cp2;
struct mbuf *mb, *mreq __unused;
struct vnode *vp;
struct vattr at;
nfsrvfh_t nsfh;
u_quad_t frev;

nfsm_srvmtofh(&nsfh);
error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam,
&rdonly, (nfsd->nd_flag & ND_KERBAUTH), false);
if (error) {
nfsm_reply(NFSX_UNSIGNED);
nfsm_srvpostop_attr(getret, &at);
return (0);
}
error = VOP_PATHCONF(vp, _PC_LINK_MAX, &linkmax);
if (!error)
error = VOP_PATHCONF(vp, _PC_NAME_MAX, &namemax);
if (!error)
error = VOP_PATHCONF(vp, _PC_CHOWN_RESTRICTED, &chownres);
if (!error)
error = VOP_PATHCONF(vp, _PC_NO_TRUNC, &notrunc);
getret = VOP_GETATTR(vp, &at, cred);
vput(vp);
nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3PATHCONF);
nfsm_srvpostop_attr(getret, &at);
if (error)
return (0);
nfsm_build(pc, struct nfsv3_pathconf *, NFSX_V3PATHCONF);

pc->pc_linkmax = txdr_unsigned(linkmax);
pc->pc_namemax = txdr_unsigned(namemax);
pc->pc_notrunc = txdr_unsigned(notrunc);
pc->pc_chownrestricted = txdr_unsigned(chownres);

/*
* These should probably be supported by VOP_PATHCONF(), but
* until msdosfs is exportable (why would you want to?), the
* Unix defaults should be ok.
*/
pc->pc_caseinsensitive = nfs_false;
pc->pc_casepreserving = nfs_true;
nfsm_srvdone;
}

/*
* Null operation, used by clients to ping server
*/
/* ARGSUSED */
int
nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep;
char *bpos;
int error = NFSERR_RETVOID, cache = 0;
struct mbuf *mb, *mreq __unused;
u_quad_t frev;

nfsm_reply(0);
nfsmout:
return (0);
}

/*
* No operation, used for obsolete procedures
*/
/* ARGSUSED */
int
nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct lwp *lwp, struct mbuf **mrq)
{
struct mbuf *mrep = nfsd->nd_mrep;
char *bpos;
int error, cache = 0;
struct mbuf *mb, *mreq __unused;
u_quad_t frev;

if (nfsd->nd_repstat)
error = nfsd->nd_repstat;
else
error = EPROCUNAVAIL;
nfsm_reply(0);
nfsmout:
return (0);
}

/*
* 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 exported rdonly as well as MNT_RDONLY for the write case
* 2 - The owner is to be given access irrespective of mode bits for some
* operations, 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.
*
* The exception to rule 2 is EPERM. If a file is IMMUTABLE, VOP_ACCESS()
* will return EPERM instead of EACCES. EPERM is always an error.
*/
int
nfsrv_access(struct vnode *vp, int flags, kauth_cred_t cred, int rdonly, struct lwp *lwp, int override)
{
struct vattr vattr;
int error;
if (flags & VWRITE) {
/* Just vn_writechk() changed to check rdonly */
/*
* 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 (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}

/*
* If the vnode is in use as a process's text,
* we can't allow writing.
*/
if (vp->v_iflag & VI_TEXT)
return (ETXTBSY);
}
error = VOP_GETATTR(vp, &vattr, cred);
if (error)
return (error);
error = VOP_ACCESS(vp, flags, cred);
/*
* Allow certain operations for the owner (reads and writes
* on files that are already open).
*/
if (override && error == EACCES && kauth_cred_geteuid(cred) == vattr.va_uid)
error = 0;
return error;
}