488 lines
13 KiB
C
488 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* These functions support the macros and help fiddle mbuf chains for
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* the nfs op functions. They do things like create the rpc header and
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* copy data between mbuf chains and uio lists.
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*/
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#include <fs/nfs/nfsport.h>
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extern struct nfsstatsv1 nfsstatsv1;
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extern int ncl_mbuf_mlen;
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extern enum vtype newnv2tov_type[8];
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extern enum vtype nv34tov_type[8];
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NFSCLSTATEMUTEX;
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static nfsuint64 nfs_nullcookie = {{ 0, 0 }};
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/*
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* copies a uio scatter/gather list to an mbuf chain.
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* NOTE: can ony handle iovcnt == 1
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*/
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void
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nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz)
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{
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char *uiocp;
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struct mbuf *mp, *mp2;
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int xfer, left, mlen;
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int uiosiz, clflg, rem;
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char *mcp, *tcp;
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KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
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if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */
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clflg = 1;
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else
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clflg = 0;
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rem = NFSM_RNDUP(siz) - siz;
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mp = mp2 = nd->nd_mb;
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mcp = nd->nd_bpos;
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while (siz > 0) {
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KASSERT((nd->nd_flag & ND_EXTPG) != 0 || mcp ==
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mtod(mp, char *) + mp->m_len, ("nfsm_uiombuf: mcp wrong"));
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left = uiop->uio_iov->iov_len;
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uiocp = uiop->uio_iov->iov_base;
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if (left > siz)
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left = siz;
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uiosiz = left;
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while (left > 0) {
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if ((nd->nd_flag & ND_EXTPG) != 0)
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mlen = nd->nd_bextpgsiz;
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else
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mlen = M_TRAILINGSPACE(mp);
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if (mlen == 0) {
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if ((nd->nd_flag & ND_EXTPG) != 0) {
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mp = nfsm_add_ext_pgs(mp,
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nd->nd_maxextsiz, &nd->nd_bextpg);
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mcp = (char *)(void *)PHYS_TO_DMAP(
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mp->m_epg_pa[nd->nd_bextpg]);
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nd->nd_bextpgsiz = mlen = PAGE_SIZE;
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} else {
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if (clflg)
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NFSMCLGET(mp, M_WAITOK);
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else
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NFSMGET(mp);
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mp->m_len = 0;
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mlen = M_TRAILINGSPACE(mp);
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mcp = mtod(mp, char *);
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mp2->m_next = mp;
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mp2 = mp;
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}
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}
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xfer = (left > mlen) ? mlen : left;
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if (uiop->uio_segflg == UIO_SYSSPACE)
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NFSBCOPY(uiocp, mcp, xfer);
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else
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copyin(uiocp, mcp, xfer);
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mp->m_len += xfer;
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left -= xfer;
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uiocp += xfer;
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mcp += xfer;
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if ((nd->nd_flag & ND_EXTPG) != 0) {
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nd->nd_bextpgsiz -= xfer;
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mp->m_epg_last_len += xfer;
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}
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uiop->uio_offset += xfer;
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uiop->uio_resid -= xfer;
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}
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tcp = (char *)uiop->uio_iov->iov_base;
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tcp += uiosiz;
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uiop->uio_iov->iov_base = (void *)tcp;
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uiop->uio_iov->iov_len -= uiosiz;
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siz -= uiosiz;
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}
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if (rem > 0) {
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if ((nd->nd_flag & ND_EXTPG) == 0 && rem >
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M_TRAILINGSPACE(mp)) {
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NFSMGET(mp);
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mp->m_len = 0;
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mp2->m_next = mp;
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mcp = mtod(mp, char *);
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} else if ((nd->nd_flag & ND_EXTPG) != 0 && rem >
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nd->nd_bextpgsiz) {
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mp = nfsm_add_ext_pgs(mp, nd->nd_maxextsiz,
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&nd->nd_bextpg);
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mcp = (char *)(void *)
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PHYS_TO_DMAP(mp->m_epg_pa[nd->nd_bextpg]);
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nd->nd_bextpgsiz = PAGE_SIZE;
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}
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for (left = 0; left < rem; left++)
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*mcp++ = '\0';
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mp->m_len += rem;
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if ((nd->nd_flag & ND_EXTPG) != 0) {
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nd->nd_bextpgsiz -= rem;
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mp->m_epg_last_len += rem;
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}
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}
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nd->nd_bpos = mcp;
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nd->nd_mb = mp;
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}
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/*
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* copies a uio scatter/gather list to an mbuf chain.
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* This version returns the mbuf list and does not use "nd".
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* NOTE: can ony handle iovcnt == 1
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*/
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struct mbuf *
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nfsm_uiombuflist(struct uio *uiop, int siz, u_int maxext)
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{
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char *uiocp;
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struct mbuf *mp, *mp2, *firstmp;
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int extpg, extpgsiz = 0, i, left, mlen, rem, xfer;
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int uiosiz, clflg;
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char *mcp, *tcp;
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KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
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if (maxext > 0) {
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mp = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
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mcp = (char *)(void *)PHYS_TO_DMAP(mp->m_epg_pa[0]);
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extpg = 0;
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extpgsiz = PAGE_SIZE;
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} else {
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if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */
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clflg = 1;
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else
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clflg = 0;
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if (clflg != 0)
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NFSMCLGET(mp, M_WAITOK);
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else
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NFSMGET(mp);
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mcp = mtod(mp, char *);
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}
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mp->m_len = 0;
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firstmp = mp2 = mp;
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rem = NFSM_RNDUP(siz) - siz;
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while (siz > 0) {
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left = uiop->uio_iov->iov_len;
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uiocp = uiop->uio_iov->iov_base;
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if (left > siz)
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left = siz;
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uiosiz = left;
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while (left > 0) {
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if (maxext > 0)
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mlen = extpgsiz;
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else
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mlen = M_TRAILINGSPACE(mp);
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if (mlen == 0) {
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if (maxext > 0) {
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mp = nfsm_add_ext_pgs(mp, maxext,
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&extpg);
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mlen = extpgsiz = PAGE_SIZE;
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mcp = (char *)(void *)PHYS_TO_DMAP(
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mp->m_epg_pa[extpg]);
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} else {
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if (clflg)
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NFSMCLGET(mp, M_WAITOK);
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else
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NFSMGET(mp);
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mcp = mtod(mp, char *);
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mlen = M_TRAILINGSPACE(mp);
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mp->m_len = 0;
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mp2->m_next = mp;
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mp2 = mp;
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}
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}
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xfer = (left > mlen) ? mlen : left;
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if (uiop->uio_segflg == UIO_SYSSPACE)
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NFSBCOPY(uiocp, mcp, xfer);
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else
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copyin(uiocp, mcp, xfer);
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mp->m_len += xfer;
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mcp += xfer;
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if (maxext > 0) {
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extpgsiz -= xfer;
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mp->m_epg_last_len += xfer;
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}
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left -= xfer;
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uiocp += xfer;
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uiop->uio_offset += xfer;
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uiop->uio_resid -= xfer;
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}
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tcp = (char *)uiop->uio_iov->iov_base;
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tcp += uiosiz;
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uiop->uio_iov->iov_base = (void *)tcp;
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uiop->uio_iov->iov_len -= uiosiz;
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siz -= uiosiz;
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}
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if (rem > 0) {
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KASSERT((mp->m_flags & M_EXTPG) != 0 ||
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rem <= M_TRAILINGSPACE(mp),
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("nfsm_uiombuflist: no space for padding"));
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for (i = 0; i < rem; i++)
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*mcp++ = '\0';
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mp->m_len += rem;
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if (maxext > 0)
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mp->m_epg_last_len += rem;
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}
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return (firstmp);
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}
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/*
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* Load vnode attributes from the xdr file attributes.
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* Returns EBADRPC if they can't be parsed, 0 otherwise.
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*/
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int
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nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap)
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{
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struct nfs_fattr *fp;
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int error = 0;
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if (nd->nd_flag & ND_NFSV4) {
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error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL,
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NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL);
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} else if (nd->nd_flag & ND_NFSV3) {
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NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR);
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nap->na_type = nfsv34tov_type(fp->fa_type);
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nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
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nap->na_rdev = NFSMAKEDEV(
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fxdr_unsigned(int, fp->fa3_rdev.specdata1),
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fxdr_unsigned(int, fp->fa3_rdev.specdata2));
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nap->na_nlink = fxdr_unsigned(uint32_t, fp->fa_nlink);
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nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
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nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
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nap->na_size = fxdr_hyper(&fp->fa3_size);
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nap->na_blocksize = NFS_FABLKSIZE;
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nap->na_bytes = fxdr_hyper(&fp->fa3_used);
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nap->na_fileid = fxdr_hyper(&fp->fa3_fileid);
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fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime);
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fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime);
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fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime);
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nap->na_flags = 0;
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nap->na_filerev = 0;
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} else {
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NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR);
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nap->na_type = nfsv2tov_type(fp->fa_type);
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nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode);
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if (nap->na_type == VNON || nap->na_type == VREG)
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nap->na_type = IFTOVT(nap->na_mode);
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nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev);
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/*
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* Really ugly NFSv2 kludge.
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*/
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if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1))
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nap->na_type = VFIFO;
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nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
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nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid);
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nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid);
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nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
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nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
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nap->na_bytes =
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(u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) *
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NFS_FABLKSIZE;
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nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid);
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fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime);
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fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime);
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nap->na_flags = 0;
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nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t,
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fp->fa2_ctime.nfsv2_sec);
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nap->na_ctime.tv_nsec = 0;
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nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
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nap->na_filerev = 0;
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}
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nfsmout:
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return (error);
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}
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/*
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* This function finds the directory cookie that corresponds to the
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* logical byte offset given.
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*/
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nfsuint64 *
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nfscl_getcookie(struct nfsnode *np, off_t off, int add)
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{
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struct nfsdmap *dp, *dp2;
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int pos;
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pos = off / NFS_DIRBLKSIZ;
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if (pos == 0) {
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KASSERT(!add, ("nfs getcookie add at 0"));
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return (&nfs_nullcookie);
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}
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pos--;
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dp = LIST_FIRST(&np->n_cookies);
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if (!dp) {
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if (add) {
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dp = malloc(sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp->ndm_eocookie = 0;
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LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
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} else
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return (NULL);
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}
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while (pos >= NFSNUMCOOKIES) {
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pos -= NFSNUMCOOKIES;
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if (LIST_NEXT(dp, ndm_list) != NULL) {
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if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
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pos >= dp->ndm_eocookie)
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return (NULL);
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dp = LIST_NEXT(dp, ndm_list);
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} else if (add) {
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dp2 = malloc(sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp2->ndm_eocookie = 0;
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LIST_INSERT_AFTER(dp, dp2, ndm_list);
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dp = dp2;
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} else
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return (NULL);
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}
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if (pos >= dp->ndm_eocookie) {
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if (add)
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dp->ndm_eocookie = pos + 1;
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else
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return (NULL);
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}
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return (&dp->ndm_cookies[pos]);
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}
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/*
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* Gets a file handle out of an nfs reply sent to the client and returns
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* the file handle and the file's attributes.
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* For V4, it assumes that Getfh and Getattr Op's results are here.
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*/
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int
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nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp,
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struct nfsvattr *nap, int *attrflagp)
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{
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u_int32_t *tl;
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int error = 0, flag = 1;
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*nfhpp = NULL;
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*attrflagp = 0;
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/*
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* First get the file handle and vnode.
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*/
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if (nd->nd_flag & ND_NFSV3) {
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NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
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flag = fxdr_unsigned(int, *tl);
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} else if (nd->nd_flag & ND_NFSV4) {
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NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
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/* If the GetFH failed, clear flag. */
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if (*++tl != 0) {
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nd->nd_flag |= ND_NOMOREDATA;
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flag = 0;
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error = ENXIO; /* Return ENXIO so *nfhpp isn't used. */
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}
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}
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if (flag) {
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error = nfsm_getfh(nd, nfhpp);
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if (error)
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return (error);
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}
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/*
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* Now, get the attributes.
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*/
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if (flag != 0 && (nd->nd_flag & ND_NFSV4) != 0) {
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NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
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if (*++tl != 0) {
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nd->nd_flag |= ND_NOMOREDATA;
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flag = 0;
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}
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} else if (nd->nd_flag & ND_NFSV3) {
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NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
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if (flag) {
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flag = fxdr_unsigned(int, *tl);
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} else if (fxdr_unsigned(int, *tl)) {
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error = nfsm_advance(nd, NFSX_V3FATTR, -1);
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if (error)
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return (error);
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}
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}
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if (flag) {
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error = nfsm_loadattr(nd, nap);
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if (!error)
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*attrflagp = 1;
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}
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nfsmout:
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return (error);
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}
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/*
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* Initialize the owner/delegation sleep lock.
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*/
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void
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nfscl_lockinit(struct nfsv4lock *lckp)
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{
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lckp->nfslock_usecnt = 0;
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lckp->nfslock_lock = 0;
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}
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/*
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* Get an exclusive lock. (Not needed for OpenBSD4, since there is only one
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* thread for each posix process in the kernel.)
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*/
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void
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nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex)
|
|
{
|
|
int igotlock;
|
|
|
|
do {
|
|
igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL);
|
|
} while (!igotlock);
|
|
}
|
|
|
|
/*
|
|
* Release an exclusive lock.
|
|
*/
|
|
void
|
|
nfscl_lockunlock(struct nfsv4lock *lckp)
|
|
{
|
|
|
|
nfsv4_unlock(lckp, 0);
|
|
}
|
|
|
|
/*
|
|
* Called to derefernce a lock on a stateid (delegation or open owner).
|
|
*/
|
|
void
|
|
nfscl_lockderef(struct nfsv4lock *lckp)
|
|
{
|
|
|
|
NFSLOCKCLSTATE();
|
|
lckp->nfslock_usecnt--;
|
|
if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) {
|
|
lckp->nfslock_lock &= ~NFSV4LOCK_WANTED;
|
|
wakeup((caddr_t)lckp);
|
|
}
|
|
NFSUNLOCKCLSTATE();
|
|
}
|