nfs_serv.c

早期freebsd实现

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs_serv.c	8.3 (Berkeley) 1/12/94
 */

/*
 * nfs version 2 server calls to vnode ops
 * - these routines generally have 3 phases
 *   1 - break down and validate rpc request in mbuf list
 *   2 - do the vnode ops for the request
 *       (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c)
 *   3 - build the rpc reply in an mbuf list
 *   nb:
 *	- do not mix the phases, since the nfsm_?? macros can return failures
 *	  on a bad rpc or similar and do not do any vrele() or vput()'s
 *
 *      - the nfsm_reply() macro generates an nfs rpc reply with the nfs
 *	error number iff error != 0 whereas
 *	returning an error from the server function implies a fatal error
 *	such as a badly constructed rpc request that should be dropped without
 *	a reply.
 */

#include <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/mbuf.h>
#include <sys/dirent.h>
#include <sys/stat.h>

#include <vm/vm.h>

#include <nfs/nfsv2.h>
#include <nfs/rpcv2.h>
#include <nfs/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nqnfs.h>

/* Defs */
#define	TRUE	1
#define	FALSE	0

/* Global vars */
extern u_long nfs_procids[NFS_NPROCS];
extern u_long nfs_xdrneg1;
extern u_long nfs_false, nfs_true;
nfstype nfs_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON,
		      NFCHR, NFNON };

/*
 * nqnfs access service
 */
nqnfsrv_access(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, rdonly, cache, mode = 0;
	char *cp2;
	struct mbuf *mb, *mreq;
	u_quad_t frev;

	fhp = &nfh.fh_generic;
	nfsm_srvmtofh(fhp);
	nfsm_dissect(tl, u_long *, 3 * NFSX_UNSIGNED);
	if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly))
		nfsm_reply(0);
	if (*tl++ == nfs_true)
		mode |= VREAD;
	if (*tl++ == nfs_true)
		mode |= VWRITE;
	if (*tl == nfs_true)
		mode |= VEXEC;
	error = nfsrv_access(vp, mode, cred, rdonly, nfsd->nd_procp);
	vput(vp);
	nfsm_reply(0);
	nfsm_srvdone;
}

/*
 * nfs getattr service
 */
nfsrv_getattr(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	register struct nfsv2_fattr *fp;
	struct vattr va;
	register struct vattr *vap = &va;
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, rdonly, cache;
	char *cp2;
	struct mbuf *mb, *mb2, *mreq;
	u_quad_t frev;

	fhp = &nfh.fh_generic;
	nfsm_srvmtofh(fhp);
	if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly))
		nfsm_reply(0);
	nqsrv_getl(vp, NQL_READ);
	error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp);
	vput(vp);
	nfsm_reply(NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL));
	nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL));
	nfsm_srvfillattr;
	nfsm_srvdone;
}

/*
 * nfs setattr service
 */
nfsrv_setattr(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	struct vattr va;
	register struct vattr *vap = &va;
	register struct nfsv2_sattr *sp;
	register struct nfsv2_fattr *fp;
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, rdonly, cache;
	char *cp2;
	struct mbuf *mb, *mb2, *mreq;
	u_quad_t frev, frev2;

	fhp = &nfh.fh_generic;
	nfsm_srvmtofh(fhp);
	nfsm_dissect(sp, struct nfsv2_sattr *, NFSX_SATTR(nfsd->nd_nqlflag != NQL_NOVAL));
	if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly))
		nfsm_reply(0);
	nqsrv_getl(vp, NQL_WRITE);
	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 (nfsd->nd_nqlflag == NQL_NOVAL) {
		if (sp->sa_nfssize != nfs_xdrneg1)
			vap->va_size = fxdr_unsigned(u_quad_t, sp->sa_nfssize);
		if (sp->sa_nfsatime.nfs_sec != nfs_xdrneg1) {
#ifdef notyet
			fxdr_nfstime(&sp->sa_nfsatime, &vap->va_atime);
#else
			vap->va_atime.ts_sec =
				fxdr_unsigned(long, sp->sa_nfsatime.nfs_sec);
			vap->va_atime.ts_nsec = 0;
#endif
		}
		if (sp->sa_nfsmtime.nfs_sec != nfs_xdrneg1)
			fxdr_nfstime(&sp->sa_nfsmtime, &vap->va_mtime);
	} else {
		fxdr_hyper(&sp->sa_nqsize, &vap->va_size);
		fxdr_nqtime(&sp->sa_nqatime, &vap->va_atime);
		fxdr_nqtime(&sp->sa_nqmtime, &vap->va_mtime);
		vap->va_flags = fxdr_unsigned(u_long, sp->sa_nqflags);
	}

	/*
	 * If the size is being changed write acces is required, otherwise
	 * just check for a read only file system.
	 */
	if (vap->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,
			nfsd->nd_procp))
			goto out;
	}
	if (error = VOP_SETATTR(vp, vap, cred, nfsd->nd_procp)) {
		vput(vp);
		nfsm_reply(0);
	}
	error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp);
out:
	vput(vp);
	nfsm_reply(NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL) + 2*NFSX_UNSIGNED);
	nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL));
	nfsm_srvfillattr;
	if (nfsd->nd_nqlflag != NQL_NOVAL) {
		nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
		txdr_hyper(&frev2, tl);
	}
	nfsm_srvdone;
}

/*
 * nfs lookup rpc
 */
nfsrv_lookup(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	register struct nfsv2_fattr *fp;
	struct nameidata nd;
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	register caddr_t cp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, cache, duration2, cache2, len;
	char *cp2;
	struct mbuf *mb, *mb2, *mreq;
	struct vattr va, *vap = &va;
	u_quad_t frev, frev2;

	fhp = &nfh.fh_generic;
	duration2 = 0;
	if (nfsd->nd_nqlflag != NQL_NOVAL) {
		nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
		duration2 = fxdr_unsigned(int, *tl);
	}
	nfsm_srvmtofh(fhp);
	nfsm_srvstrsiz(len, NFS_MAXNAMLEN);
	nd.ni_cnd.cn_cred = cred;
	nd.ni_cnd.cn_nameiop = LOOKUP;
	nd.ni_cnd.cn_flags = LOCKLEAF | SAVESTART;
	if (error = nfs_namei(&nd, fhp, len, nfsd->nd_slp, nam, &md, &dpos,
	    nfsd->nd_procp))
		nfsm_reply(0);
	nqsrv_getl(nd.ni_startdir, NQL_READ);
	vrele(nd.ni_startdir);
	FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI);
	vp = nd.ni_vp;
	bzero((caddr_t)fhp, sizeof(nfh));
	fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
	if (error = VFS_VPTOFH(vp, &fhp->fh_fid)) {
		vput(vp);
		nfsm_reply(0);
	}
	if (duration2)
		(void) nqsrv_getlease(vp, &duration2, NQL_READ, nfsd,
			nam, &cache2, &frev2, cred);
	error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp);
	vput(vp);
	nfsm_reply(NFSX_FH + NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL) + 5*NFSX_UNSIGNED);
	if (nfsd->nd_nqlflag != NQL_NOVAL) {
		if (duration2) {
			nfsm_build(tl, u_long *, 5*NFSX_UNSIGNED);
			*tl++ = txdr_unsigned(NQL_READ);
			*tl++ = txdr_unsigned(cache2);
			*tl++ = txdr_unsigned(duration2);
			txdr_hyper(&frev2, tl);
		} else {
			nfsm_build(tl, u_long *, NFSX_UNSIGNED);
			*tl = 0;
		}
	}
	nfsm_srvfhtom(fhp);
	nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL));
	nfsm_srvfillattr;
	nfsm_srvdone;
}

/*
 * nfs readlink service
 */
nfsrv_readlink(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
	register struct iovec *ivp = iv;
	register struct mbuf *mp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, rdonly, cache, i, tlen, len;
	char *cp2;
	struct mbuf *mb, *mb2, *mp2, *mp3, *mreq;
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	struct uio io, *uiop = &io;
	u_quad_t frev;

	fhp = &nfh.fh_generic;
	nfsm_srvmtofh(fhp);
	len = 0;
	i = 0;
	while (len < NFS_MAXPATHLEN) {
		MGET(mp, M_WAIT, MT_DATA);
		MCLGET(mp, M_WAIT);
		mp->m_len = NFSMSIZ(mp);
		if (len == 0)
			mp3 = mp2 = mp;
		else {
			mp2->m_next = mp;
			mp2 = mp;
		}
		if ((len+mp->m_len) > NFS_MAXPATHLEN) {
			mp->m_len = NFS_MAXPATHLEN-len;
			len = NFS_MAXPATHLEN;
		} else
			len += mp->m_len;
		ivp->iov_base = mtod(mp, caddr_t);
		ivp->iov_len = mp->m_len;
		i++;
		ivp++;
	}
	uiop->uio_iov = iv;
	uiop->uio_iovcnt = i;
	uiop->uio_offset = 0;
	uiop->uio_resid = len;
	uiop->uio_rw = UIO_READ;
	uiop->uio_segflg = UIO_SYSSPACE;
	uiop->uio_procp = (struct proc *)0;
	if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly)) {
		m_freem(mp3);
		nfsm_reply(0);
	}
	if (vp->v_type != VLNK) {
		error = EINVAL;
		goto out;
	}
	nqsrv_getl(vp, NQL_READ);
	error = VOP_READLINK(vp, uiop, cred);
out:
	vput(vp);
	if (error)
		m_freem(mp3);
	nfsm_reply(NFSX_UNSIGNED);
	if (uiop->uio_resid > 0) {
		len -= uiop->uio_resid;
		tlen = nfsm_rndup(len);
		nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len);
	}
	nfsm_build(tl, u_long *, NFSX_UNSIGNED);
	*tl = txdr_unsigned(len);
	mb->m_next = mp3;
	nfsm_srvdone;
}

/*
 * nfs read service
 */
nfsrv_read(nfsd, mrep, md, dpos, cred, nam, mrq)
	struct nfsd *nfsd;
	struct mbuf *mrep, *md;
	caddr_t dpos;
	struct ucred *cred;
	struct mbuf *nam, **mrq;
{
	register struct iovec *iv;
	struct iovec *iv2;
	register struct mbuf *m;
	register struct nfsv2_fattr *fp;
	register u_long *tl;
	register long t1;
	caddr_t bpos;
	int error = 0, rdonly, cache, i, cnt, len, left, siz, tlen;
	char *cp2;
	struct mbuf *mb, *mb2, *mreq;
	struct mbuf *m2;
	struct vnode *vp;
	nfsv2fh_t nfh;
	fhandle_t *fhp;
	struct uio io, *uiop = &io;
	struct vattr va, *vap = &va;
	off_t off;
	u_quad_t frev;

	fhp = &nfh.fh_generic;
	nfsm_srvmtofh(fhp);
	if (nfsd->nd_nqlflag == NQL_NOVAL) {
		nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
		off = (off_t)fxdr_unsigned(u_long, *tl);
	} else {
		nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED);
		fxdr_hyper(tl, &off);
	}
	nfsm_srvstrsiz(cnt, NFS_MAXDATA);
	if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly))
		nfsm_reply(0);
	if (vp->v_type != VREG) {
		error = (vp->v_type == VDIR) ? EISDIR : EACCES;
		vput(vp);
		nfsm_reply(0);
	}
	nqsrv_getl(vp, NQL_READ);
	if ((error = nfsrv_access(vp, VREAD, cred, rdonly, nfsd->nd_procp)) &&
	    (error = nfsrv_access(vp, VEXEC, cred, rdonly, nfsd->nd_procp))) {
		vput(vp);
		nfsm_reply(0);
	}
	if (error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp)) {
		vput(vp);
		nfsm_reply(0);
	}
	if (off >= vap->va_size)
		cnt = 0;
	else if ((off + cnt) > vap->va_size)
		cnt = nfsm_rndup(vap->va_size - off);
	nfsm_reply(NFSX_FATTR(nfsd->nd_nqlflag != NQL_NOVAL)+NFSX_UNSIGNED+nfsm_rndup(cnt));