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/* $NetBSD: nfs_node.c,v 1.14 1995/12/19 23:07:27 cgd Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_node.c 8.2 (Berkeley) 12/30/93
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>
#define NFSNOHASH(fhsum) \
(&nfsnodehashtbl[(fhsum) & nfsnodehash])
LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
u_long nfsnodehash;
#define TRUE 1
#define FALSE 0
/*
* Initialize hash links for nfsnodes
* and build nfsnode free list.
*/
nfs_nhinit()
{
nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
}
/*
* Compute an entry in the NFS hash table structure
*/
struct nfsnodehashhead *
nfs_hash(fhp)
register nfsv2fh_t *fhp;
{
register u_char *fhpp;
register u_long fhsum;
int i;
fhpp = &fhp->fh_bytes[0];
fhsum = 0;
for (i = 0; i < NFSX_FH; i++)
fhsum += *fhpp++;
return (NFSNOHASH(fhsum));
}
/*
* Look up a vnode/nfsnode by file handle.
* Callers must check for mount points!!
* In all cases, a pointer to a
* nfsnode structure is returned.
*/
nfs_nget(mntp, fhp, npp)
struct mount *mntp;
register nfsv2fh_t *fhp;
struct nfsnode **npp;
{
register struct nfsnode *np;
struct nfsnodehashhead *nhpp;
register struct vnode *vp;
extern int (**nfsv2_vnodeop_p)();
struct vnode *nvp;
int error;
nhpp = nfs_hash(fhp);
loop:
for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
if (mntp != NFSTOV(np)->v_mount ||
bcmp((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH))
continue;
vp = NFSTOV(np);
if (vget(vp, 1))
goto loop;
*npp = np;
return(0);
}
if (error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp)) {
*npp = 0;
return (error);
}
vp = nvp;
MALLOC(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
vp->v_data = np;
np->n_vnode = vp;
/*
* Insert the nfsnode in the hash queue for its new file handle
*/
np->n_flag = 0;
LIST_INSERT_HEAD(nhpp, np, n_hash);
bcopy((caddr_t)fhp, (caddr_t)&np->n_fh, NFSX_FH);
np->n_attrstamp = 0;
np->n_direofoffset = 0;
np->n_sillyrename = (struct sillyrename *)0;
np->n_size = 0;
np->n_mtime = 0;
np->n_lockf = 0;
if (VFSTONFS(mntp)->nm_flag & NFSMNT_NQNFS) {
np->n_brev = 0;
np->n_lrev = 0;
np->n_expiry = (time_t)0;
np->n_timer.cqe_next = (struct nfsnode *)0;
}
*npp = np;
return (0);
}
nfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct nfsnode *np;
register struct sillyrename *sp;
struct proc *p = curproc; /* XXX */
extern int prtactive;
np = VTONFS(ap->a_vp);
if (prtactive && ap->a_vp->v_usecount != 0)
vprint("nfs_inactive: pushing active", ap->a_vp);
sp = np->n_sillyrename;
np->n_sillyrename = (struct sillyrename *)0;
if (sp) {
/*
* Remove the silly file that was rename'd earlier
*/
(void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
nfs_removeit(sp);
crfree(sp->s_cred);
vrele(sp->s_dvp);
#ifdef SILLYSEPARATE
free((caddr_t)sp, M_NFSREQ);
#endif
}
np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
NQNFSNONCACHE | NQNFSWRITE);
return (0);
}
/*
* Reclaim an nfsnode so that it can be used for other purposes.
*/
nfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct nfsnode *np = VTONFS(vp);
register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
extern int prtactive;
if (prtactive && vp->v_usecount != 0)
vprint("nfs_reclaim: pushing active", vp);
LIST_REMOVE(np, n_hash);
/*
* For nqnfs, take it off the timer queue as required.
*/
if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_timer.cqe_next != 0) {
CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
}
cache_purge(vp);
FREE(vp->v_data, M_NFSNODE);
vp->v_data = (void *)0;
return (0);
}
/*
* Lock an nfsnode
*/
nfs_lock(ap)
struct vop_lock_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
/*
* Ugh, another place where interruptible mounts will get hung.
* If you make this sleep interruptible, then you have to fix all
* the VOP_LOCK() calls to expect interruptibility.
*/
while (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
sleep((caddr_t)vp, PINOD);
}
if (vp->v_tag == VT_NON)
return (ENOENT);
return (0);
}
/*
* Unlock an nfsnode
*/
nfs_unlock(ap)
struct vop_unlock_args /* {
struct vnode *a_vp;
} */ *ap;
{
return (0);
}
/*
* Check for a locked nfsnode
*/
nfs_islocked(ap)
struct vop_islocked_args /* {
struct vnode *a_vp;
} */ *ap;
{
return (0);
}
/*
* Nfs abort op, called after namei() when a CREATE/DELETE isn't actually
* done. Currently nothing to do.
*/
/* ARGSUSED */
int
nfs_abortop(ap)
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap;
{
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
return (0);
}
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