e225b7bd09
- Reorganize locking in UVM and provide extra serialisation for pmap(9). New lock order: [vmpage-owner-lock] -> pmap-lock. - Simplify locking in some pmap(9) modules by removing P->V locking. - Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs). - Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner. Add TLBSTATS option for x86 to collect statistics about TLB shootdowns. - Unify /dev/mem et al in MI code and provide required locking (removes kernel-lock on some ports). Also, avoid cache-aliasing issues. Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches formed the core changes of this branch.
547 lines
16 KiB
C
547 lines
16 KiB
C
/* $NetBSD: nfs_clntsubs.c,v 1.2 2011/06/12 03:35:59 rmind Exp $ */
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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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* @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
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*/
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/*
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* Copyright 2000 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nfs_clntsubs.c,v 1.2 2011/06/12 03:35:59 rmind Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_nfs.h"
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#endif
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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 <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/filedesc.h>
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#include <sys/time.h>
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#include <sys/dirent.h>
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#include <sys/once.h>
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#include <sys/kauth.h>
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#include <sys/atomic.h>
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#include <uvm/uvm_extern.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfsnode.h>
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#include <nfs/nfs.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfsm_subs.h>
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#include <nfs/nfsmount.h>
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#include <nfs/nfsrtt.h>
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#include <nfs/nfs_var.h>
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#include <miscfs/specfs/specdev.h>
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#include <netinet/in.h>
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/*
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* Attribute cache routines.
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* nfs_loadattrcache() - loads or updates the cache contents from attributes
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* that are on the mbuf list
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* nfs_getattrcache() - returns valid attributes if found in cache, returns
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* error otherwise
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*/
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/*
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* Load the attribute cache (that lives in the nfsnode entry) with
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* the values on the mbuf list and
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* Iff vap not NULL
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* copy the attributes to *vaper
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*/
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int
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nfsm_loadattrcache(struct vnode **vpp, struct mbuf **mdp, char **dposp, struct vattr *vaper, int flags)
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{
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int32_t t1;
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char *cp2;
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int error = 0;
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struct mbuf *md;
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int v3 = NFS_ISV3(*vpp);
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md = *mdp;
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t1 = (mtod(md, char *) + md->m_len) - *dposp;
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error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2);
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if (error)
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return (error);
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return nfs_loadattrcache(vpp, (struct nfs_fattr *)cp2, vaper, flags);
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}
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int
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nfs_loadattrcache(struct vnode **vpp, struct nfs_fattr *fp, struct vattr *vaper, int flags)
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{
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struct vnode *vp = *vpp;
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struct vattr *vap;
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int v3 = NFS_ISV3(vp);
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enum vtype vtyp;
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u_short vmode;
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struct timespec mtime;
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struct timespec ctime;
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int32_t rdev;
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struct nfsnode *np;
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extern int (**spec_nfsv2nodeop_p)(void *);
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uid_t uid;
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gid_t gid;
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if (v3) {
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vtyp = nfsv3tov_type(fp->fa_type);
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vmode = fxdr_unsigned(u_short, fp->fa_mode);
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rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1),
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fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2));
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fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
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fxdr_nfsv3time(&fp->fa3_ctime, &ctime);
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} else {
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vtyp = nfsv2tov_type(fp->fa_type);
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vmode = fxdr_unsigned(u_short, fp->fa_mode);
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if (vtyp == VNON || vtyp == VREG)
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vtyp = IFTOVT(vmode);
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rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
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fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
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ctime.tv_sec = fxdr_unsigned(u_int32_t,
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fp->fa2_ctime.nfsv2_sec);
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ctime.tv_nsec = 0;
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/*
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* Really ugly NFSv2 kludge.
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*/
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if (vtyp == VCHR && rdev == 0xffffffff)
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vtyp = VFIFO;
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}
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vmode &= ALLPERMS;
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/*
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* If v_type == VNON it is a new node, so fill in the v_type,
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* n_mtime fields. Check to see if it represents a special
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* device, and if so, check for a possible alias. Once the
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* correct vnode has been obtained, fill in the rest of the
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* information.
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*/
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np = VTONFS(vp);
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if (vp->v_type == VNON) {
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vp->v_type = vtyp;
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if (vp->v_type == VFIFO) {
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extern int (**fifo_nfsv2nodeop_p)(void *);
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vp->v_op = fifo_nfsv2nodeop_p;
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} else if (vp->v_type == VREG) {
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mutex_init(&np->n_commitlock, MUTEX_DEFAULT, IPL_NONE);
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} else if (vp->v_type == VCHR || vp->v_type == VBLK) {
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vp->v_op = spec_nfsv2nodeop_p;
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spec_node_init(vp, (dev_t)rdev);
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}
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np->n_mtime = mtime;
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}
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uid = fxdr_unsigned(uid_t, fp->fa_uid);
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gid = fxdr_unsigned(gid_t, fp->fa_gid);
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vap = np->n_vattr;
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/*
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* Invalidate access cache if uid, gid, mode or ctime changed.
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*/
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if (np->n_accstamp != -1 &&
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(gid != vap->va_gid || uid != vap->va_uid || vmode != vap->va_mode
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|| timespeccmp(&ctime, &vap->va_ctime, !=)))
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np->n_accstamp = -1;
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vap->va_type = vtyp;
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vap->va_mode = vmode;
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vap->va_rdev = (dev_t)rdev;
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vap->va_mtime = mtime;
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vap->va_ctime = ctime;
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vap->va_birthtime.tv_sec = VNOVAL;
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vap->va_birthtime.tv_nsec = VNOVAL;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
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switch (vtyp) {
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case VDIR:
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vap->va_blocksize = NFS_DIRFRAGSIZ;
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break;
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case VBLK:
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vap->va_blocksize = BLKDEV_IOSIZE;
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break;
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case VCHR:
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vap->va_blocksize = MAXBSIZE;
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break;
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default:
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vap->va_blocksize = v3 ? vp->v_mount->mnt_stat.f_iosize :
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fxdr_unsigned(int32_t, fp->fa2_blocksize);
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break;
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}
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if (v3) {
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vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
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vap->va_uid = uid;
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vap->va_gid = gid;
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vap->va_size = fxdr_hyper(&fp->fa3_size);
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vap->va_bytes = fxdr_hyper(&fp->fa3_used);
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vap->va_fileid = fxdr_hyper(&fp->fa3_fileid);
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fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
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vap->va_flags = 0;
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vap->va_filerev = 0;
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} else {
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vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
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vap->va_uid = uid;
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vap->va_gid = gid;
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vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
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vap->va_bytes = fxdr_unsigned(int32_t, fp->fa2_blocks)
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* NFS_FABLKSIZE;
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vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
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fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
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vap->va_flags = 0;
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vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
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vap->va_filerev = 0;
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}
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if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) {
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return EFBIG;
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}
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if (vap->va_size != np->n_size) {
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if ((np->n_flag & NMODIFIED) && vap->va_size < np->n_size) {
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vap->va_size = np->n_size;
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} else {
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np->n_size = vap->va_size;
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if (vap->va_type == VREG) {
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/*
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* we can't free pages if NAC_NOTRUNC because
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* the pages can be owned by ourselves.
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*/
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if (flags & NAC_NOTRUNC) {
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np->n_flag |= NTRUNCDELAYED;
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} else {
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genfs_node_wrlock(vp);
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mutex_enter(vp->v_interlock);
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(void)VOP_PUTPAGES(vp, 0,
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0, PGO_SYNCIO | PGO_CLEANIT |
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PGO_FREE | PGO_ALLPAGES);
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uvm_vnp_setsize(vp, np->n_size);
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genfs_node_unlock(vp);
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}
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}
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}
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}
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np->n_attrstamp = time_second;
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if (vaper != NULL) {
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memcpy((void *)vaper, (void *)vap, sizeof(*vap));
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if (np->n_flag & NCHG) {
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if (np->n_flag & NACC)
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vaper->va_atime = np->n_atim;
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if (np->n_flag & NUPD)
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vaper->va_mtime = np->n_mtim;
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}
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}
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return (0);
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}
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/*
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* Check the time stamp
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* If the cache is valid, copy contents to *vap and return 0
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* otherwise return an error
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*/
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int
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nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
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{
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struct nfsnode *np = VTONFS(vp);
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struct nfsmount *nmp = VFSTONFS(vp->v_mount);
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struct vattr *vap;
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if (np->n_attrstamp == 0 ||
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(time_second - np->n_attrstamp) >= nfs_attrtimeo(nmp, np)) {
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nfsstats.attrcache_misses++;
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return (ENOENT);
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}
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nfsstats.attrcache_hits++;
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vap = np->n_vattr;
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if (vap->va_size != np->n_size) {
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if (vap->va_type == VREG) {
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if ((np->n_flag & NMODIFIED) != 0 &&
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vap->va_size < np->n_size) {
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vap->va_size = np->n_size;
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} else {
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np->n_size = vap->va_size;
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}
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genfs_node_wrlock(vp);
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uvm_vnp_setsize(vp, np->n_size);
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genfs_node_unlock(vp);
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} else
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np->n_size = vap->va_size;
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}
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memcpy((void *)vaper, (void *)vap, sizeof(struct vattr));
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if (np->n_flag & NCHG) {
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if (np->n_flag & NACC)
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vaper->va_atime = np->n_atim;
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if (np->n_flag & NUPD)
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vaper->va_mtime = np->n_mtim;
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}
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return (0);
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}
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void
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nfs_delayedtruncate(struct vnode *vp)
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{
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struct nfsnode *np = VTONFS(vp);
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if (np->n_flag & NTRUNCDELAYED) {
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np->n_flag &= ~NTRUNCDELAYED;
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genfs_node_wrlock(vp);
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mutex_enter(vp->v_interlock);
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(void)VOP_PUTPAGES(vp, 0,
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0, PGO_SYNCIO | PGO_CLEANIT | PGO_FREE | PGO_ALLPAGES);
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uvm_vnp_setsize(vp, np->n_size);
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genfs_node_unlock(vp);
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}
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}
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#define NFS_WCCKLUDGE_TIMEOUT (24 * 60 * 60) /* 1 day */
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#define NFS_WCCKLUDGE(nmp, now) \
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(((nmp)->nm_iflag & NFSMNT_WCCKLUDGE) && \
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((now) - (nmp)->nm_wcckludgetime - NFS_WCCKLUDGE_TIMEOUT) < 0)
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/*
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* nfs_check_wccdata: check inaccurate wcc_data
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*
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* => return non-zero if we shouldn't trust the wcc_data.
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* => NFS_WCCKLUDGE_TIMEOUT is for the case that the server is "fixed".
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*/
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int
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nfs_check_wccdata(struct nfsnode *np, const struct timespec *ctime,
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struct timespec *mtime, bool docheck)
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{
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int error = 0;
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#if !defined(NFS_V2_ONLY)
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if (docheck) {
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struct vnode *vp = NFSTOV(np);
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struct nfsmount *nmp;
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long now = time_second;
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const struct timespec *omtime = &np->n_vattr->va_mtime;
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const struct timespec *octime = &np->n_vattr->va_ctime;
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const char *reason = NULL; /* XXX: gcc */
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if (timespeccmp(omtime, mtime, <=)) {
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reason = "mtime";
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error = EINVAL;
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}
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if (vp->v_type == VDIR && timespeccmp(octime, ctime, <=)) {
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reason = "ctime";
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error = EINVAL;
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}
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nmp = VFSTONFS(vp->v_mount);
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if (error) {
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/*
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* despite of the fact that we've updated the file,
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* timestamps of the file were not updated as we
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* expected.
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* it means that the server has incompatible
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* semantics of timestamps or (more likely)
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* the server time is not precise enough to
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* track each modifications.
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* in that case, we disable wcc processing.
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*
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* yes, strictly speaking, we should disable all
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* caching. it's a compromise.
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*/
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mutex_enter(&nmp->nm_lock);
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if (!NFS_WCCKLUDGE(nmp, now)) {
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printf("%s: inaccurate wcc data (%s) detected,"
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" disabling wcc"
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" (ctime %u.%09u %u.%09u,"
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" mtime %u.%09u %u.%09u)\n",
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vp->v_mount->mnt_stat.f_mntfromname,
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reason,
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(unsigned int)octime->tv_sec,
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(unsigned int)octime->tv_nsec,
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(unsigned int)ctime->tv_sec,
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(unsigned int)ctime->tv_nsec,
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(unsigned int)omtime->tv_sec,
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(unsigned int)omtime->tv_nsec,
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(unsigned int)mtime->tv_sec,
|
|
(unsigned int)mtime->tv_nsec);
|
|
}
|
|
nmp->nm_iflag |= NFSMNT_WCCKLUDGE;
|
|
nmp->nm_wcckludgetime = now;
|
|
mutex_exit(&nmp->nm_lock);
|
|
} else if (NFS_WCCKLUDGE(nmp, now)) {
|
|
error = EPERM; /* XXX */
|
|
} else if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
|
|
mutex_enter(&nmp->nm_lock);
|
|
if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
|
|
printf("%s: re-enabling wcc\n",
|
|
vp->v_mount->mnt_stat.f_mntfromname);
|
|
nmp->nm_iflag &= ~NFSMNT_WCCKLUDGE;
|
|
}
|
|
mutex_exit(&nmp->nm_lock);
|
|
}
|
|
}
|
|
|
|
#endif /* !defined(NFS_V2_ONLY) */
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Heuristic to see if the server XDR encodes directory cookies or not.
|
|
* it is not supposed to, but a lot of servers may do this. Also, since
|
|
* most/all servers will implement V2 as well, it is expected that they
|
|
* may return just 32 bits worth of cookie information, so we need to
|
|
* find out in which 32 bits this information is available. We do this
|
|
* to avoid trouble with emulated binaries that can't handle 64 bit
|
|
* directory offsets.
|
|
*/
|
|
|
|
void
|
|
nfs_cookieheuristic(struct vnode *vp, int *flagp, struct lwp *l, kauth_cred_t cred)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
char *tbuf, *cp;
|
|
struct dirent *dp;
|
|
off_t *cookies = NULL, *cop;
|
|
int error, eof, nc, len;
|
|
|
|
tbuf = malloc(NFS_DIRFRAGSIZ, M_TEMP, M_WAITOK);
|
|
|
|
aiov.iov_base = tbuf;
|
|
aiov.iov_len = NFS_DIRFRAGSIZ;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_resid = NFS_DIRFRAGSIZ;
|
|
auio.uio_offset = 0;
|
|
UIO_SETUP_SYSSPACE(&auio);
|
|
|
|
error = VOP_READDIR(vp, &auio, cred, &eof, &cookies, &nc);
|
|
|
|
len = NFS_DIRFRAGSIZ - auio.uio_resid;
|
|
if (error || len == 0) {
|
|
free(tbuf, M_TEMP);
|
|
if (cookies)
|
|
free(cookies, M_TEMP);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Find the first valid entry and look at its offset cookie.
|
|
*/
|
|
|
|
cp = tbuf;
|
|
for (cop = cookies; len > 0; len -= dp->d_reclen) {
|
|
dp = (struct dirent *)cp;
|
|
if (dp->d_fileno != 0 && len >= dp->d_reclen) {
|
|
if ((*cop >> 32) != 0 && (*cop & 0xffffffffLL) == 0) {
|
|
*flagp |= NFSMNT_SWAPCOOKIE;
|
|
nfs_invaldircache(vp, 0);
|
|
nfs_vinvalbuf(vp, 0, cred, l, 1);
|
|
}
|
|
break;
|
|
}
|
|
cop++;
|
|
cp += dp->d_reclen;
|
|
}
|
|
|
|
free(tbuf, M_TEMP);
|
|
free(cookies, M_TEMP);
|
|
}
|
|
|
|
/*
|
|
* Set the attribute timeout based on how recently the file has been modified.
|
|
*/
|
|
|
|
time_t
|
|
nfs_attrtimeo(struct nfsmount *nmp, struct nfsnode *np)
|
|
{
|
|
time_t timeo;
|
|
|
|
if ((nmp->nm_flag & NFSMNT_NOAC) != 0)
|
|
return 0;
|
|
|
|
if (((np)->n_flag & NMODIFIED) != 0)
|
|
return NFS_MINATTRTIMO;
|
|
|
|
timeo = (time_second - np->n_mtime.tv_sec) / 10;
|
|
timeo = max(timeo, NFS_MINATTRTIMO);
|
|
timeo = min(timeo, NFS_MAXATTRTIMO);
|
|
return timeo;
|
|
}
|