cd6ce72f3c
mount point for seeing whether or not the new nfsnode is already in the hash queue. We're pretty much guaranteed that the old nfsnode is already in the hash queue. Wank! Infinite Loop! Looks like just a minor typo.... (ah the influence of fortran ... np && np2... why not nfsnode_the_first && nfsnode_the_second???)...
406 lines
10 KiB
C
406 lines
10 KiB
C
/*
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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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* $Id: nfs_node.c,v 1.30 1999/06/15 23:24:14 mjacob Exp $
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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/malloc.h>
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#include <vm/vm_zone.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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static vm_zone_t nfsnode_zone;
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static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
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static 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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nfsnode_zone = zinit("NFSNODE", sizeof(struct nfsnode), 0, 0, 1);
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nfsnodehashtbl = hashinit(desiredvnodes, M_NFSHASH, &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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static int nfs_node_hash_lock;
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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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struct proc *p = curproc; /* XXX */
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struct nfsnode *np, *np2;
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struct nfsnodehashhead *nhpp;
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register struct vnode *vp;
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struct vnode *nvp;
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int error;
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retry:
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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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if (vget(vp, LK_EXCLUSIVE, p))
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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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/*
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* Obtain a lock to prevent a race condition if the getnewvnode()
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* or MALLOC() below happens to block.
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*/
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if (nfs_node_hash_lock) {
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while (nfs_node_hash_lock) {
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nfs_node_hash_lock = -1;
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tsleep(&nfs_node_hash_lock, PVM, "nfsngt", 0);
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}
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goto loop;
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}
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nfs_node_hash_lock = 1;
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/*
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* Allocate before getnewvnode since doing so afterward
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* might cause a bogus v_data pointer to get dereferenced
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* elsewhere if zalloc should block.
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*/
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np = zalloc(nfsnode_zone);
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error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
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if (error) {
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if (nfs_node_hash_lock < 0)
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wakeup(&nfs_node_hash_lock);
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nfs_node_hash_lock = 0;
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*npp = 0;
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zfree(nfsnode_zone, np);
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return (error);
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}
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vp = nvp;
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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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for (np2 = nhpp->lh_first; np2 != 0; np2 = np2->n_hash.le_next) {
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if (mntp != NFSTOV(np2)->v_mount || np2->n_fhsize != fhsize ||
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bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize))
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continue;
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vrele(vp);
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if (nfs_node_hash_lock < 0)
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wakeup(&nfs_node_hash_lock);
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nfs_node_hash_lock = 0;
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zfree(nfsnode_zone, np);
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goto retry;
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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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if (nfs_node_hash_lock < 0)
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wakeup(&nfs_node_hash_lock);
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nfs_node_hash_lock = 0;
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/*
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* Lock the new nfsnode.
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*/
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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return (0);
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}
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int
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nfs_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap;
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{
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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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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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if (sp) {
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/*
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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 unless we
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* are being forcibly unmounted in which case we already
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* have our own reference.
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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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else if (vget(ap->a_vp, 0, p))
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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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VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
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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(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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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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if (prtactive && vp->v_usecount != 0)
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vprint("nfs_reclaim: pushing active", vp);
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if (np->n_hash.le_prev != NULL)
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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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zfree(nfsnode_zone, vp->v_data);
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vp->v_data = (void *)0;
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return (0);
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}
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#if 0
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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(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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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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#if 0
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/*
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* Only lock regular files. If a server crashed while we were
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* holding a directory lock, we could easily end up sleeping
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* until the server rebooted while holding a lock on the root.
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* Locks are only needed for protecting critical sections in
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* VMIO at the moment.
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* New vnodes will have type VNON but they should be locked
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* since they may become VREG. This is checked in loadattrcache
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* and unwanted locks are released there.
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*/
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if (vp->v_type == VREG || vp->v_type == VNON) {
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while (np->n_flag & NLOCKED) {
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np->n_flag |= NWANTED;
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(void) tsleep((caddr_t) np, PINOD, "nfslck2", 0);
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/*
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* If the vnode has transmuted into a VDIR while we
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* were asleep, then skip the lock.
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*/
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if (vp->v_type != VREG && vp->v_type != VNON)
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return (0);
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}
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np->n_flag |= NLOCKED;
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}
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#endif
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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(ap)
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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#if 0
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struct vnode* vp = ap->a_vp;
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struct nfsnode* np = VTONFS(vp);
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if (vp->v_type == VREG || vp->v_type == VNON) {
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if (!(np->n_flag & NLOCKED))
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panic("nfs_unlock: nfsnode not locked");
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np->n_flag &= ~NLOCKED;
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if (np->n_flag & NWANTED) {
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np->n_flag &= ~NWANTED;
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wakeup((caddr_t) np);
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}
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}
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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(ap)
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struct vop_islocked_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
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}
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#endif
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/*
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* Nfs abort op, called after namei() when a CREATE/DELETE isn't actually
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* done. Currently nothing to do.
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*/
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/* ARGSUSED */
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int
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nfs_abortop(ap)
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struct vop_abortop_args /* {
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struct vnode *a_dvp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
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zfree(namei_zone, ap->a_cnp->cn_pnbuf);
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return (0);
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}
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