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add islocked function to vnode switch
[unix-history] / usr / src / sys / nfs / nfs_serv.c
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)nfs_serv.c 7.11 (Berkeley) %G%
*/
/*
* nfs version 2 server calls to vnode ops
* - these routines generally have 3 phases
* 1 - break down and validate rpc request in mbuf list
* 2 - do the vnode ops for the request
* (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c)
* 3 - build the rpc reply in an mbuf list
* nb:
* - do not mix the phases, since the nfsm_?? macros can return failures
* on mbuf exhaustion 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
* nfsm_srverr simply drops the mbufs and gives up
* (==> nfsm_srverr implies an error here at the server, usually mbuf
* exhaustion)
*/
#include "strings.h"
#include "time.h"
#include "param.h"
#include "mount.h"
#include "malloc.h"
#include "mbuf.h"
#include "file.h"
#include "user.h"
#include "../ufs/dir.h"
#include "vnode.h"
#include "uio.h"
#include "ucred.h"
#include "namei.h"
#include "errno.h"
#include "../ufs/inode.h"
#include "nfsv2.h"
#include "nfs.h"
#include "xdr_subs.h"
#include "nfsm_subs.h"
/* Defs */
#define TRUE 1
#define FALSE 0
/* Global vars */
extern u_long nfs_procids[NFS_NPROCS];
extern u_long nfs_xdrneg1;
extern u_long nfs_false, nfs_true;
nfstype nfs_type[VSOCK+1]={ NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON, };
/*
* nfs getattr service
*/
nfsrv_getattr(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct nfsv2_fattr *fp;
struct vattr va;
register struct vattr *vap = &va;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs setattr service
*/
nfsrv_setattr(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct vattr va;
register struct vattr *vap = &va;
register struct nfsv2_sattr *sp;
register struct nfsv2_fattr *fp;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(sp, struct nfsv2_sattr *, NFSX_SATTR);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VWRITE, cred))
goto out;
vattr_null(vap);
/*
* Nah nah nah nah na nah
* There is a bug in the Sun client that puts 0xffff in the mode
* field of sattr when it should put in 0xffffffff. The u_short
* doesn't sign extend.
* --> check the low order 2 bytes for 0xffff
*/
if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
vap->va_mode = nfstov_mode(sp->sa_mode);
if (sp->sa_uid != nfs_xdrneg1)
vap->va_uid = fxdr_unsigned(uid_t, sp->sa_uid);
if (sp->sa_gid != nfs_xdrneg1)
vap->va_gid = fxdr_unsigned(gid_t, sp->sa_gid);
if (sp->sa_size != nfs_xdrneg1)
vap->va_size = fxdr_unsigned(u_long, sp->sa_size);
/*
* The usec field of sa_atime is overloaded with the va_flags field
* for 4.4BSD clients. Hopefully other clients always set both the
* sec and usec fields to -1 when not setting the atime.
*/
if (sp->sa_atime.tv_sec != nfs_xdrneg1) {
vap->va_atime.tv_sec = fxdr_unsigned(long, sp->sa_atime.tv_sec);
vap->va_atime.tv_usec = 0;
}
if (sp->sa_atime.tv_usec != nfs_xdrneg1)
vap->va_flags = fxdr_unsigned(u_long, sp->sa_atime.tv_usec);
if (sp->sa_mtime.tv_sec != nfs_xdrneg1)
fxdr_time(&sp->sa_mtime, &vap->va_mtime);
if (error = VOP_SETATTR(vp, vap, cred)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred);
out:
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs lookup rpc
*/
nfsrv_lookup(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct nfsv2_fattr *fp;
struct nameidata nami;
register struct nameidata *ndp = &nami;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
register caddr_t cp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
long len;
struct vattr va, *vap = &va;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = LOOKUP | LOCKLEAF;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
nfsm_reply(0);
vp = ndp->ni_vp;
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->m_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs readlink service
*/
nfsrv_readlink(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct iovec iv[NFS_MAXPATHLEN/MLEN+1];
register struct iovec *ivp = iv;
register struct mbuf *mp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mp2, *mp3, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
int i, tlen, len;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
len = 0;
i = 0;
while (len < NFS_MAXPATHLEN) {
MGET(mp, M_WAIT, MT_DATA);
NFSMCLGET(mp, M_WAIT);
mp->m_len = NFSMSIZ(mp);
if (len == 0)
mp3 = mp2 = mp;
else
mp2->m_next = mp;
if ((len+mp->m_len) > NFS_MAXPATHLEN) {
mp->m_len = NFS_MAXPATHLEN-len;
len = NFS_MAXPATHLEN;
} else
len += mp->m_len;
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
i++;
ivp++;
}
uiop->uio_iov = iv;
uiop->uio_iovcnt = i;
uiop->uio_offset = 0;
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred)) {
m_freem(mp3);
nfsm_reply(0);
}
if (vp->v_type != VLNK) {
error = EINVAL;
goto out;
}
error = VOP_READLINK(vp, uiop, cred);
out:
vput(vp);
if (error)
m_freem(mp3);
nfsm_reply(NFSX_UNSIGNED);
if (uiop->uio_resid > 0) {
len -= uiop->uio_resid;
tlen = nfsm_rndup(len);
nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len);
}
nfsm_build(p, u_long *, NFSX_UNSIGNED);
*p = txdr_unsigned(len);
mb->m_next = mp3;
nfsm_srvdone;
}
/*
* nfs read service
*/
nfsrv_read(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct iovec iv[NFS_MAXDATA/MCLBYTES+1];
register struct iovec *ivp = iv;
register struct mbuf *mp;
register struct nfsv2_fattr *fp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct mbuf *mp2, *mp3;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
struct vattr va, *vap = &va;
int i, tlen, cnt, len, nio, left;
off_t off;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(p, u_long *, NFSX_UNSIGNED);
off = fxdr_unsigned(off_t, *p);
nfsm_srvstrsiz(cnt, NFS_MAXDATA);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VREAD | VEXEC, cred)) {
vput(vp);
nfsm_reply(0);
}
len = left = cnt;
nio = (cnt+MCLBYTES-1)/MCLBYTES;
uiop->uio_iov = ivp;
uiop->uio_iovcnt = nio;
uiop->uio_offset = off;
uiop->uio_resid = cnt;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
for (i = 0; i < nio; i++) {
MGET(mp, M_WAIT, MT_DATA);
if (left > MLEN)
NFSMCLGET(mp, M_WAIT);
mp->m_len = (M_HASCL(mp)) ? MCLBYTES : MLEN;
if (i == 0) {
mp3 = mp2 = mp;
} else {
mp2->m_next = mp;
mp2 = mp;
}
if (left > MLEN && !M_HASCL(mp)) {
m_freem(mp3);
vput(vp);
nfsm_srverr;
}
ivp->iov_base = mtod(mp, caddr_t);
if (left > mp->m_len) {
ivp->iov_len = mp->m_len;
left -= mp->m_len;
} else {
ivp->iov_len = mp->m_len = left;
left = 0;
}
ivp++;
}
error = VOP_READ(vp, uiop, IO_NODELOCKED, cred);
off = uiop->uio_offset;
if (error) {
m_freem(mp3);
vput(vp);
nfsm_reply(0);
}
if (error = VOP_GETATTR(vp, vap, cred))
m_freem(mp3);
vput(vp);
nfsm_reply(NFSX_FATTR+NFSX_UNSIGNED);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
if (uiop->uio_resid > 0) {
len -= uiop->uio_resid;
if (len > 0) {
tlen = nfsm_rndup(len);
nfsm_adj(mp3, cnt-tlen, tlen-len);
} else {
m_freem(mp3);
mp3 = (struct mbuf *)0;
}
}
nfsm_build(p, u_long *, NFSX_UNSIGNED);
*p = txdr_unsigned(len);
mb->m_next = mp3;
nfsm_srvdone;
}
/*
* nfs write service
*/
nfsrv_write(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct iovec *ivp;
register struct mbuf *mp;
register struct nfsv2_fattr *fp;
struct iovec iv[MAX_IOVEC];
struct vattr va;
register struct vattr *vap = &va;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io, *uiop = &io;
off_t off;
long siz, len, xfer;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(p, u_long *, 4*NFSX_UNSIGNED);
off = fxdr_unsigned(off_t, *++p);
p += 2;
len = fxdr_unsigned(long, *p);
if (len > NFS_MAXDATA || len <= 0) {
error = EBADRPC;
nfsm_reply(0);
}
if (dpos == (mtod(md, caddr_t)+md->m_len)) {
mp = md->m_next;
if (mp == NULL) {
error = EBADRPC;
nfsm_reply(0);
}
} else {
mp = md;
siz = dpos-mtod(mp, caddr_t);
mp->m_len -= siz;
NFSMADV(mp, siz);
}
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VWRITE, cred)) {
vput(vp);
nfsm_reply(0);
}
uiop->uio_resid = 0;
uiop->uio_rw = UIO_WRITE;
uiop->uio_segflg = UIO_SYSSPACE;
/*
* Do up to MAX_IOVEC mbufs of write each iteration of the
* loop until done.
*/
while (len > 0 && uiop->uio_resid == 0) {
ivp = iv;
siz = 0;
uiop->uio_iov = ivp;
uiop->uio_iovcnt = 0;
uiop->uio_offset = off;
while (len > 0 && uiop->uio_iovcnt < MAX_IOVEC && mp != NULL) {
ivp->iov_base = mtod(mp, caddr_t);
if (len < mp->m_len)
ivp->iov_len = xfer = len;
else
ivp->iov_len = xfer = mp->m_len;
#ifdef notdef
/* Not Yet .. */
if (M_HASCL(mp) && (((u_long)ivp->iov_base) & CLOFSET) == 0)
ivp->iov_op = NULL; /* what should it be ?? */
else
ivp->iov_op = NULL;
#endif
uiop->uio_iovcnt++;
ivp++;
len -= xfer;
siz += xfer;
mp = mp->m_next;
}
if (len > 0 && mp == NULL) {
error = EBADRPC;
vput(vp);
nfsm_reply(0);
}
uiop->uio_resid = siz;
if (error = VOP_WRITE(vp, uiop, IO_SYNC | IO_NODELOCKED,
cred)) {
vput(vp);
nfsm_reply(0);
}
off = uiop->uio_offset;
}
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
nfsm_reply(NFSX_FATTR);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
nfsm_srvdone;
}
/*
* nfs create service
* now does a truncate to 0 length via. setattr if it already exists
*/
nfsrv_create(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct nfsv2_fattr *fp;
struct vattr va;
register struct vattr *vap = &va;
struct nameidata nami;
register struct nameidata *ndp = &nami;
register caddr_t cp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
nfsm_reply(0);
vattr_null(vap);
nfsm_disect(p, u_long *, NFSX_UNSIGNED);
/*
* Iff doesn't exist, create it
* otherwise just truncate to 0 length
* should I set the mode too ??
*/
if (ndp->ni_vp == NULL) {
vap->va_type = VREG;
vap->va_mode = nfstov_mode(*p++);
if (error = VOP_CREATE(ndp, vap))
nfsm_reply(0);
vp = ndp->ni_vp;
} else {
vp = ndp->ni_vp;
ndp->ni_vp = (struct vnode *)0;
VOP_ABORTOP(ndp);
vap->va_size = 0;
if (error = VOP_SETATTR(vp, vap, cred))
nfsm_reply(0);
}
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->m_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
return (error);
nfsmout:
VOP_ABORTOP(ndp);
return (error);
}
/*
* nfs remove service
*/
nfsrv_remove(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct nameidata nami;
register struct nameidata *ndp = &nami;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
nfsm_reply(0);
vp = ndp->ni_vp;
if (vp->v_type == VDIR &&
(error = suser(cred, (short *)0)))
goto out;
/*
* Don't unlink a mounted file.
*/
if (vp->v_flag & VROOT) {
error = EBUSY;
goto out;
}
if (vp->v_flag & VTEXT)
xrele(vp); /* try once to free text */
out:
if (error)
VOP_ABORTOP(ndp);
else
error = VOP_REMOVE(ndp);
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs rename service
*/
nfsrv_rename(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct nameidata *ndp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct nameidata nami, tond;
struct vnode *fvp, *tvp, *tdvp;
nfsv2fh_t fnfh, tnfh;
fhandle_t *ffhp, *tfhp;
long len, len2;
int rootflg = 0;
ndp = &nami;
ndinit(ndp);
ffhp = &fnfh.fh_generic;
tfhp = &tnfh.fh_generic;
nfsm_srvmtofh(ffhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
/*
* Remember if we are root so that we can reset cr_uid before
* the second nfs_namei() call
*/
if (cred->cr_uid == 0)
rootflg++;
ndp->ni_cred = cred;
ndp->ni_nameiop = DELETE | WANTPARENT;
if (error = nfs_namei(ndp, ffhp, len, &md, &dpos))
nfsm_reply(0);
fvp = ndp->ni_vp;
nfsm_srvmtofh(tfhp);
nfsm_srvstrsiz(len2, NFS_MAXNAMLEN);
if (rootflg)
cred->cr_uid = 0;
ndinit(&tond);
crhold(cred);
tond.ni_cred = cred;
tond.ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE;
error = nfs_namei(&tond, tfhp, len2, &md, &dpos);
tdvp = tond.ni_dvp;
tvp = tond.ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = EISDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = ENOTDIR;
goto out;
}
}
if (error) {
VOP_ABORTOP(ndp);
goto out1;
}
if (fvp->v_mount != tdvp->v_mount) {
error = EXDEV;
goto out;
}
if (fvp == tdvp || fvp == tvp)
error = EINVAL;
out:
if (error) {
VOP_ABORTOP(&tond);
VOP_ABORTOP(ndp);
} else {
VREF(ndp->ni_cdir);
VREF(tond.ni_cdir);
error = VOP_RENAME(ndp, &tond);
vrele(ndp->ni_cdir);
vrele(tond.ni_cdir);
}
out1:
crfree(cred);
nfsm_reply(0);
return (error);
nfsmout:
VOP_ABORTOP(ndp);
return (error);
}
/*
* nfs link service
*/
nfsrv_link(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct nameidata nami;
register struct nameidata *ndp = &nami;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp, *xp;
nfsv2fh_t nfh, dnfh;
fhandle_t *fhp, *dfhp;
long len;
ndinit(ndp);
fhp = &nfh.fh_generic;
dfhp = &dnfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvmtofh(dfhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
if (error = nfsrv_fhtovp(fhp, FALSE, &vp, cred))
nfsm_reply(0);
if (vp->v_type == VDIR && (error = suser(cred, NULL)))
goto out1;
ndp->ni_cred = cred;
ndp->ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(ndp, dfhp, len, &md, &dpos))
goto out1;
xp = ndp->ni_vp;
if (xp != NULL) {
error = EEXIST;
goto out;
}
xp = ndp->ni_dvp;
if (vp->v_mount != xp->v_mount)
error = EXDEV;
out:
if (error)
VOP_ABORTOP(ndp);
else
error = VOP_LINK(vp, ndp);
out1:
vrele(vp);
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs symbolic link service
*/
nfsrv_symlink(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct vattr va;
struct nameidata nami;
register struct nameidata *ndp = &nami;
register struct vattr *vap = &va;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len, tlen, len2;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
goto out1;
nfsm_srvstrsiz(len2, NFS_MAXPATHLEN);
tlen = nfsm_rndup(len2);
if (len2 == tlen) {
nfsm_disect(cp2, caddr_t, tlen+NFSX_UNSIGNED);
*(cp2+tlen) = '\0';
} else {
nfsm_disect(cp2, caddr_t, tlen);
}
vp = ndp->ni_vp;
if (vp) {
error = EEXIST;
goto out;
}
vp = ndp->ni_dvp;
vattr_null(vap);
vap->va_mode = 0777;
out:
if (error)
VOP_ABORTOP(ndp);
else
error = VOP_SYMLINK(ndp, vap, cp2);
out1:
nfsm_reply(0);
return (error);
nfsmout:
VOP_ABORTOP(ndp);
return (error);
}
/*
* nfs mkdir service
*/
nfsrv_mkdir(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct vattr va;
register struct vattr *vap = &va;
register struct nfsv2_fattr *fp;
struct nameidata nami;
register struct nameidata *ndp = &nami;
register caddr_t cp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = CREATE | LOCKPARENT;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
nfsm_reply(0);
nfsm_disect(p, u_long *, NFSX_UNSIGNED);
vattr_null(vap);
vap->va_type = VDIR;
vap->va_mode = nfstov_mode(*p++);
vp = ndp->ni_vp;
if (vp != NULL) {
VOP_ABORTOP(ndp);
error = EEXIST;
nfsm_reply(0);
}
if (error = VOP_MKDIR(ndp, vap))
nfsm_reply(0);
vp = ndp->ni_vp;
bzero((caddr_t)fhp, sizeof(nfh));
fhp->fh_fsid = vp->v_mount->m_fsid;
if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
vput(vp);
nfsm_reply(0);
}
error = VOP_GETATTR(vp, vap, cred);
vput(vp);
nfsm_reply(NFSX_FH+NFSX_FATTR);
nfsm_srvfhtom(fhp);
nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR);
nfsm_srvfillattr;
return (error);
nfsmout:
VOP_ABORTOP(ndp);
return (error);
}
/*
* nfs rmdir service
*/
nfsrv_rmdir(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf *mrep, *md, **mrq;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
struct nameidata nami;
register struct nameidata *ndp = &nami;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
long len;
ndinit(ndp);
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
ndp->ni_cred = cred;
ndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
if (error = nfs_namei(ndp, fhp, len, &md, &dpos))
nfsm_reply(0);
vp = ndp->ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (ndp->ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* Don't unlink a mounted file.
*/
if (vp->v_flag & VROOT)
error = EBUSY;
out:
if (error)
VOP_ABORTOP(ndp);
else
error = VOP_RMDIR(ndp);
nfsm_reply(0);
nfsm_srvdone;
}
/*
* nfs readdir service
* - mallocs what it thinks is enough to read
* count rounded up to a multiple of DIRBLKSIZ <= MAX_READDIR
* - calls VOP_READDIR()
* - loops arround building the reply
* if the output generated exceeds count break out of loop
* The nfsm_clget macro is used here so that the reply will be packed
* tightly in mbuf clusters.
* - it only knows that it has encountered eof when the VOP_READDIR()
* reads nothing
* - as such one readdir rpc will return eof false although you are there
* and then the next will return eof
* - it trims out records with d_ino == 0
* this doesn't matter for Unix clients, but they might confuse clients
* for other os'.
* NB: It is tempting to set eof to true if the VOP_READDIR() reads less
* than requested, but this may not apply to all filesystems. For
* example, client NFS does not { although it is never remote mounted
* anyhow }
* PS: The NFS protocol spec. does not clarify what the "count" byte
* argument is a count of.. just name strings and file id's or the
* entire reply rpc or ...
* I tried just file name and id sizes and it confused the Sun client,
* so I am using the full rpc size now. The "paranoia.." comment refers
* to including the status longwords that are not a part of the dir.
* "entry" structures, but are in the rpc.
*/
nfsrv_readdir(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register char *bp, *be;
register struct mbuf *mp;
register struct direct *dp;
register caddr_t cp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
char *cpos, *cend;
int len, nlen, rem, xfer, tsiz, i;
struct vnode *vp;
struct mbuf *mp2, *mp3;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct uio io;
struct iovec iv;
int siz, cnt, fullsiz;
u_long on;
char *rbuf;
off_t off, toff;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
nfsm_disect(p, u_long *, 2*NFSX_UNSIGNED);
toff = fxdr_unsigned(off_t, *p++);
off = (toff & ~(DIRBLKSIZ-1));
on = (toff & (DIRBLKSIZ-1));
cnt = fxdr_unsigned(int, *p);
siz = ((cnt+DIRBLKSIZ) & ~(DIRBLKSIZ-1));
if (cnt > MAX_READDIR)
siz = MAX_READDIR;
fullsiz = siz;
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
if (error = nfsrv_access(vp, VEXEC, cred)) {
vput(vp);
nfsm_reply(0);
}
VOP_UNLOCK(vp);
MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
again:
iv.iov_base = rbuf;
iv.iov_len = fullsiz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = off;
io.uio_resid = fullsiz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
error = VOP_READDIR(vp, &io, cred);
off = io.uio_offset;
if (error) {
vrele(vp);
free((caddr_t)rbuf, M_TEMP);
nfsm_reply(0);
}
if (io.uio_resid) {
siz -= io.uio_resid;
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vrele(vp);
nfsm_reply(2*NFSX_UNSIGNED);
nfsm_build(p, u_long *, 2*NFSX_UNSIGNED);
*p++ = nfs_false;
*p = nfs_true;
FREE((caddr_t)rbuf, M_TEMP);
return (0);
}
}
cpos = rbuf+on;
cend = rbuf+siz;
dp = (struct direct *)cpos;
/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
if (cpos >= cend || (dp->d_ino == 0 && (cpos+dp->d_reclen) >= cend)) {
toff = off;
siz = fullsiz;
on = 0;
goto again;
}
vrele(vp);
len = 3*NFSX_UNSIGNED; /* paranoia, probably can be 0 */
bp = be = (caddr_t)0;
mp3 = (struct mbuf *)0;
nfsm_reply(siz);
/* Loop through the records and build reply */
while (cpos < cend) {
if (dp->d_ino != 0) {
nlen = dp->d_namlen;
rem = nfsm_rndup(nlen)-nlen;
/*
* As noted above, the NFS spec. is not clear about what
* should be included in "count" as totalled up here in
* "len".
*/
len += (4*NFSX_UNSIGNED+nlen+rem);
if (len > cnt)
break;
/* Build the directory record xdr from the direct entry */
nfsm_clget;
*p = nfs_true;
bp += NFSX_UNSIGNED;
nfsm_clget;
*p = txdr_unsigned(dp->d_ino);
bp += NFSX_UNSIGNED;
nfsm_clget;
*p = txdr_unsigned(nlen);
bp += NFSX_UNSIGNED;
/* And loop arround copying the name */
xfer = nlen;
cp = dp->d_name;
while (xfer > 0) {
nfsm_clget;
if ((bp+xfer) > be)
tsiz = be-bp;
else
tsiz = xfer;
bcopy(cp, bp, tsiz);
bp += tsiz;
xfer -= tsiz;
if (xfer > 0)
cp += tsiz;
}
/* And null pad to a long boundary */
for (i = 0; i < rem; i++)
*bp++ = '\0';
nfsm_clget;
/* Finish off the record */
toff += dp->d_reclen;
*p = txdr_unsigned(toff);
bp += NFSX_UNSIGNED;
} else
toff += dp->d_reclen;
cpos += dp->d_reclen;
dp = (struct direct *)cpos;
}
nfsm_clget;
*p = nfs_false;
bp += NFSX_UNSIGNED;
nfsm_clget;
*p = nfs_false;
bp += NFSX_UNSIGNED;
if (bp < be)
mp->m_len = bp-mtod(mp, caddr_t);
mb->m_next = mp3;
FREE(rbuf, M_TEMP);
nfsm_srvdone;
}
/*
* nfs statfs service
*/
nfsrv_statfs(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
register struct statfs *sf;
register struct nfsv2_statfs *sfp;
register u_long *p;
register long t1;
caddr_t bpos;
int error = 0;
char *cp2;
struct mbuf *mb, *mb2, *mreq;
struct vnode *vp;
nfsv2fh_t nfh;
fhandle_t *fhp;
struct statfs statfs;
fhp = &nfh.fh_generic;
nfsm_srvmtofh(fhp);
if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred))
nfsm_reply(0);
sf = &statfs;
error = VFS_STATFS(vp->v_mount, sf);
vput(vp);
nfsm_reply(NFSX_STATFS);
nfsm_build(sfp, struct nfsv2_statfs *, NFSX_STATFS);
sfp->sf_tsize = txdr_unsigned(NFS_MAXDATA);
sfp->sf_bsize = txdr_unsigned(sf->f_fsize);
sfp->sf_blocks = txdr_unsigned(sf->f_blocks);
sfp->sf_bfree = txdr_unsigned(sf->f_bfree);
sfp->sf_bavail = txdr_unsigned(sf->f_bavail);
nfsm_srvdone;
}
/*
* Null operation, used by clients to ping server
*/
/* ARGSUSED */
nfsrv_null(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
caddr_t bpos;
int error = 0;
struct mbuf *mb, *mreq;
error = VNOVAL;
nfsm_reply(0);
return (error);
}
/*
* No operation, used for obsolete procedures
*/
/* ARGSUSED */
nfsrv_noop(mrep, md, dpos, cred, xid, mrq, repstat)
struct mbuf **mrq;
struct mbuf *mrep, *md;
caddr_t dpos;
struct ucred *cred;
u_long xid;
int *repstat;
{
caddr_t bpos;
int error = 0;
struct mbuf *mb, *mreq;
error = EPROCUNAVAIL;
nfsm_reply(0);
return (error);
}
/*
* Perform access checking for vnodes obtained from file handles that would
* refer to files already opened by a Unix client. You cannot just use
* vn_writechk() and VOP_ACCESS() for two reasons.
* 1 - You must check for M_EXRDONLY as well as M_RDONLY for the write case
* 2 - The owner is to be given access irrespective of mode bits so that
* processes that chmod after opening a file don't break. I don't like
* this because it opens a security hole, but since the nfs server opens
* a security hole the size of a barn door anyhow, what the heck.
*/
nfsrv_access(vp, flags, cred)
register struct vnode *vp;
int flags;
register struct ucred *cred;
{
struct vattr vattr;
int error;
if (flags & VWRITE) {
/* Just vn_writechk() changed to check M_EXRDONLY */
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket or a block or character
* device resident on the file system.
*/
if ((vp->v_mount->m_flag & (M_RDONLY | M_EXRDONLY)) &&
vp->v_type != VCHR &&
vp->v_type != VBLK &&
vp->v_type != VSOCK)
return (EROFS);
/*
* If there's shared text associated with
* the inode, try to free it up once. If
* we fail, we can't allow writing.
*/
if (vp->v_flag & VTEXT)
xrele(vp);
if (vp->v_flag & VTEXT)
return (ETXTBSY);
if (error = VOP_GETATTR(vp, &vattr, cred))
return (error);
if (cred->cr_uid == vattr.va_uid)
return (0);
} else {
if (error = VOP_GETATTR(vp, &vattr, cred))
return (error);
if (cred->cr_uid == vattr.va_uid)
return (0);
}
return (VOP_ACCESS(vp, flags, cred));
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.