7a970115da
date: 1996/09/06 03:00:31; author: donn; state: Exp; lines: +1 -2 Because NFS doesn't implement vnode locking, nfs_inactive() doesn't really have the vnode locked and hence it can't reliably access the vnode after it performs a blocking operation. We remove one blocking call and push the no-op VOP_UNLOCK higher so that we don't access the vnode after we delete the sillyrename file. This should prevent crashes we've seen in which the vnode turned into a UFS vnode and caused a panic in ufs_unlock() when we tried to 'unlock' it. date: 1996/09/25 19:15:21; author: cp; state: Exp; lines: +4 -0 Kirk's change to not corrupt files after a delete. date: 1996/11/08 19:53:45; author: donn; state: Exp; lines: +16 -4 Krik's change to solve the paradox that vclean() calls nfs_inactive() with VXLOCK set on the vnode, and nfs_inactive() was calling vget() to get a reference on the vnode, which in turn hung on VXLOCK. Nfs_inactive() now checks v_usecount to make sure that the vnode is not coming from vclean() before it does a vget().
330 lines
7.9 KiB
C
330 lines
7.9 KiB
C
/* $NetBSD: nfs_node.c,v 1.19 1997/02/22 02:45:48 fvdl 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. 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 by the University of
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* California, Berkeley and its contributors.
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* 4. 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_node.c 8.6 (Berkeley) 5/22/95
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfs.h>
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#include <nfs/nfsnode.h>
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#include <nfs/nfsmount.h>
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#include <nfs/nqnfs.h>
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#include <nfs/nfs_var.h>
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LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
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u_long nfsnodehash;
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#define TRUE 1
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#define FALSE 0
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/*
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* Initialize hash links for nfsnodes
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* and build nfsnode free list.
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*/
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void
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nfs_nhinit()
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{
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nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
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}
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/*
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* Compute an entry in the NFS hash table structure
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*/
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u_long
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nfs_hash(fhp, fhsize)
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register nfsfh_t *fhp;
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int fhsize;
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{
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register u_char *fhpp;
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register u_long fhsum;
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register int i;
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fhpp = &fhp->fh_bytes[0];
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fhsum = 0;
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for (i = 0; i < fhsize; i++)
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fhsum += *fhpp++;
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return (fhsum);
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}
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/*
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* Look up a vnode/nfsnode by file handle.
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* Callers must check for mount points!!
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* In all cases, a pointer to a
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* nfsnode structure is returned.
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*/
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int
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nfs_nget(mntp, fhp, fhsize, npp)
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struct mount *mntp;
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register nfsfh_t *fhp;
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int fhsize;
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struct nfsnode **npp;
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{
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#ifdef Lite2_integrated
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struct proc *p = curproc; /* XXX */
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#endif
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register struct nfsnode *np;
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struct nfsnodehashhead *nhpp;
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register struct vnode *vp;
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extern int (**nfsv2_vnodeop_p)__P((void *));
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struct vnode *nvp;
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int error;
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nhpp = NFSNOHASH(nfs_hash(fhp, fhsize));
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loop:
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for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
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if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
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bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
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continue;
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vp = NFSTOV(np);
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#ifdef Lite2_integrated
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if (vget(vp, LK_EXCLUSIVE, p))
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#else
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if (vget(vp, 1))
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#endif
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goto loop;
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*npp = np;
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return(0);
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}
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error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
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if (error) {
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*npp = 0;
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return (error);
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}
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vp = nvp;
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MALLOC(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
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bzero((caddr_t)np, sizeof *np);
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vp->v_data = np;
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np->n_vnode = vp;
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/*
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* Insert the nfsnode in the hash queue for its new file handle
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*/
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LIST_INSERT_HEAD(nhpp, np, n_hash);
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if (fhsize > NFS_SMALLFH) {
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MALLOC(np->n_fhp, nfsfh_t *, fhsize, M_NFSBIGFH, M_WAITOK);
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} else
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np->n_fhp = &np->n_fh;
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bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
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np->n_fhsize = fhsize;
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*npp = np;
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return (0);
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}
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int
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nfs_inactive(v)
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void *v;
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{
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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#ifdef Lite2_integrated
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struct proc *a_p;
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#endif
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} */ *ap = v;
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register struct nfsnode *np;
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register struct sillyrename *sp;
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struct proc *p = curproc; /* XXX */
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extern int prtactive;
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np = VTONFS(ap->a_vp);
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if (prtactive && ap->a_vp->v_usecount != 0)
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vprint("nfs_inactive: pushing active", ap->a_vp);
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if (ap->a_vp->v_type != VDIR) {
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sp = np->n_sillyrename;
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np->n_sillyrename = (struct sillyrename *)0;
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} else
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sp = (struct sillyrename *)0;
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#ifdef Lite2_integrated
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VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
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#else
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VOP_UNLOCK(ap->a_vp);
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#endif
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if (sp) {
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/*
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* If the usecount is greater than zero, then we are
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* being inactivated by a forcible unmount and do not
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* have to get our own reference. In the normal case,
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* we need a reference to keep the vnode from being
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* recycled by getnewvnode while we do the I/O
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* associated with discarding the buffers.
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*/
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if (ap->a_vp->v_usecount > 0)
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(void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
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#ifdef Lite2_integrated
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else if (vget(ap->a_vp, 0, p))
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#else
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else if (vget(ap->a_vp, 0))
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#endif
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panic("nfs_inactive: lost vnode");
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else {
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(void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
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vrele(ap->a_vp);
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}
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/*
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* Remove the silly file that was rename'd earlier
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*/
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nfs_removeit(sp);
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crfree(sp->s_cred);
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vrele(sp->s_dvp);
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FREE((caddr_t)sp, M_NFSREQ);
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}
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np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
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NQNFSNONCACHE | NQNFSWRITE);
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return (0);
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}
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/*
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* Reclaim an nfsnode so that it can be used for other purposes.
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*/
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int
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nfs_reclaim(v)
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void *v;
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{
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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register struct vnode *vp = ap->a_vp;
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register struct nfsnode *np = VTONFS(vp);
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register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
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register struct nfsdmap *dp, *dp2;
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extern int prtactive;
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if (prtactive && vp->v_usecount != 0)
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vprint("nfs_reclaim: pushing active", vp);
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LIST_REMOVE(np, n_hash);
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/*
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* For nqnfs, take it off the timer queue as required.
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*/
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if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_timer.cqe_next != 0) {
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CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
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}
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/*
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* Free up any directory cookie structures and
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* large file handle structures that might be associated with
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* this nfs node.
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*/
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if (vp->v_type == VDIR) {
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dp = np->n_cookies.lh_first;
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while (dp) {
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dp2 = dp;
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dp = dp->ndm_list.le_next;
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FREE((caddr_t)dp2, M_NFSDIROFF);
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}
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}
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if (np->n_fhsize > NFS_SMALLFH) {
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FREE((caddr_t)np->n_fhp, M_NFSBIGFH);
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}
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cache_purge(vp);
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FREE(vp->v_data, M_NFSNODE);
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vp->v_data = (void *)0;
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return (0);
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}
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#ifndef Lite2_integrated
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/*
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* Lock an nfsnode
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*/
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int
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nfs_lock(v)
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void *v;
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{
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struct vop_lock_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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register struct vnode *vp = ap->a_vp;
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/*
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* Ugh, another place where interruptible mounts will get hung.
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* If you make this sleep interruptible, then you have to fix all
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* the VOP_LOCK() calls to expect interruptibility.
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*/
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while (vp->v_flag & VXLOCK) {
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vp->v_flag |= VXWANT;
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(void) tsleep((caddr_t)vp, PINOD, "nfslck", 0);
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}
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if (vp->v_tag == VT_NON)
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return (ENOENT);
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return (0);
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}
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/*
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* Unlock an nfsnode
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*/
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int
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nfs_unlock(v)
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void *v;
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{
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#if 0
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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#endif
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return (0);
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}
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/*
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* Check for a locked nfsnode
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*/
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int
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nfs_islocked(v)
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void *v;
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{
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#if 0
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struct vop_islocked_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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#endif
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return (0);
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}
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#endif /* Lite2_integrated */
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