a18b1f1d4d
Add lockdestroy() and appropriate invocations, which corresponds to lockinit() and must be called to clean up after a lockmgr lock is no longer needed.
405 lines
10 KiB
C
405 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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* $FreeBSD$
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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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int rsflags;
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struct nfsmount *nmp;
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/*
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* Calculate nfs mount point and figure out whether the rslock should
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* be interruptable or not.
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*/
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nmp = VFSTONFS(mntp);
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if (nmp->nm_flag & NFSMNT_INT)
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rsflags = PCATCH;
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else
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rsflags = 0;
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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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lockinit(&np->n_rslock, PVFS | rsflags, "nfrslk", 0, LK_NOPAUSE);
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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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lockdestroy(&np->n_rslock);
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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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struct proc *a_p;
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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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