/
nfs_serv.c
3614 lines (3462 loc) · 88.2 KB
/
nfs_serv.c
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/* $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)