Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/nfs/nfs_node.c

342 lines
8.6 KiB
C
Raw Blame History

/* $NetBSD: nfs_node.c,v 1.70 2003/08/07 16:33:50 agc 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. 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 8.6 (Berkeley) 5/22/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.70 2003/08/07 16:33:50 agc Exp $");
#include "opt_nfs.h"
#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 <sys/pool.h>
#include <sys/lock.h>
#include <sys/hash.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>
#include <nfs/nfs_var.h>
struct nfsnodehashhead *nfsnodehashtbl;
u_long nfsnodehash;
struct lock nfs_hashlock;
struct pool nfs_node_pool; /* memory pool for nfs nodes */
struct pool nfs_vattr_pool; /* memory pool for nfs vattrs */
MALLOC_DEFINE(M_NFSBIGFH, "NFS bigfh", "NFS big filehandle");
MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part");
extern int prtactive;
#define nfs_hash(x,y) hash32_buf((x), (y), HASH32_BUF_INIT)
void nfs_gop_size(struct vnode *, off_t, off_t *, int);
int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *);
int nfs_gop_write(struct vnode *, struct vm_page **, int, int);
struct genfs_ops nfs_genfsops = {
nfs_gop_size,
nfs_gop_alloc,
nfs_gop_write,
};
/*
* Initialize hash links for nfsnodes
* and build nfsnode free list.
*/
void
nfs_nhinit()
{
nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE,
M_WAITOK, &nfsnodehash);
lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0);
pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl",
&pool_allocator_nointr);
pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl",
&pool_allocator_nointr);
}
/*
* Reinitialize inode hash table.
*/
void
nfs_nhreinit()
{
struct nfsnode *np;
struct nfsnodehashhead *oldhash, *hash;
u_long oldmask, mask, val;
int i;
hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK,
&mask);
lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL);
oldhash = nfsnodehashtbl;
oldmask = nfsnodehash;
nfsnodehashtbl = hash;
nfsnodehash = mask;
for (i = 0; i <= oldmask; i++) {
while ((np = LIST_FIRST(&oldhash[i])) != NULL) {
LIST_REMOVE(np, n_hash);
val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize));
LIST_INSERT_HEAD(&hash[val], np, n_hash);
}
}
lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
hashdone(oldhash, M_NFSNODE);
}
/*
* Free resources previoslu allocated in nfs_nhinit().
*/
void
nfs_nhdone()
{
hashdone(nfsnodehashtbl, M_NFSNODE);
pool_destroy(&nfs_node_pool);
pool_destroy(&nfs_vattr_pool);
}
/*
* 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.
*/
int
nfs_nget(mntp, fhp, fhsize, npp)
struct mount *mntp;
nfsfh_t *fhp;
int fhsize;
struct nfsnode **npp;
{
struct nfsnode *np;
struct nfsnodehashhead *nhpp;
struct vnode *vp;
struct vnode *nvp;
int error;
nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))];
loop:
LIST_FOREACH(np, nhpp, n_hash) {
if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
memcmp(fhp, np->n_fhp, fhsize))
continue;
vp = NFSTOV(np);
if (vget(vp, LK_EXCLUSIVE))
goto loop;
*npp = np;
return(0);
}
if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0))
goto loop;
error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
if (error) {
*npp = 0;
lockmgr(&nfs_hashlock, LK_RELEASE, 0);
return (error);
}
vp = nvp;
np = pool_get(&nfs_node_pool, PR_WAITOK);
memset(np, 0, sizeof *np);
lockinit(&np->n_commitlock, PINOD, "nfsclock", 0, 0);
vp->v_data = np;
np->n_vnode = vp;
genfs_node_init(vp, &nfs_genfsops);
/*
* Insert the nfsnode in the hash queue for its new file handle
*/
LIST_INSERT_HEAD(nhpp, np, n_hash);
if (fhsize > NFS_SMALLFH) {
np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
} else
np->n_fhp = &np->n_fh;
memcpy(np->n_fhp, fhp, fhsize);
np->n_fhsize = fhsize;
np->n_accstamp = -1;
np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK);
lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL);
lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
error = VOP_GETATTR(vp, np->n_vattr, curproc->p_ucred, curproc);
if (error) {
vput(vp);
return error;
}
uvm_vnp_setsize(vp, np->n_vattr->va_size);
*npp = np;
return (0);
}
int
nfs_inactive(v)
void *v;
{
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap = v;
struct nfsnode *np;
struct sillyrename *sp;
struct proc *p = ap->a_p;
struct vnode *vp = ap->a_vp;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
boolean_t removed;
np = VTONFS(vp);
if (prtactive && vp->v_usecount != 0)
vprint("nfs_inactive: pushing active", vp);
if (vp->v_type != VDIR) {
sp = np->n_sillyrename;
np->n_sillyrename = (struct sillyrename *)0;
} else
sp = NULL;
if (sp != NULL)
nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1);
removed = (np->n_flag & NREMOVED) != 0;
np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
NQNFSNONCACHE | NQNFSWRITE);
VOP_UNLOCK(vp, 0);
if (sp != NULL) {
/*
* Remove the silly file that was rename'd earlier
*/
vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY);
nfs_removeit(sp);
crfree(sp->s_cred);
vput(sp->s_dvp);
FREE(sp, M_NFSREQ);
}
if ((nmp->nm_flag & NFSMNT_NQNFS) && CIRCLEQ_NEXT(np, n_timer) != 0) {
CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
}
if (vp->v_type == VDIR && np->n_dircache)
nfs_invaldircache(vp, 1);
if (removed)
vrecycle(vp, NULL, p);
return (0);
}
/*
* Reclaim an nfsnode so that it can be used for other purposes.
*/
int
nfs_reclaim(v)
void *v;
{
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
if (prtactive && vp->v_usecount != 0)
vprint("nfs_reclaim: pushing active", vp);
LIST_REMOVE(np, n_hash);
/*
* Free up any directory cookie structures and
* large file handle structures that might be associated with
* this nfs node.
*/
if (vp->v_type == VDIR && np->n_dircache)
hashdone(np->n_dircache, M_NFSDIROFF);
KASSERT(np->n_dirgens == NULL);
if (np->n_fhsize > NFS_SMALLFH)
free(np->n_fhp, M_NFSBIGFH);
pool_put(&nfs_vattr_pool, np->n_vattr);
if (np->n_rcred)
crfree(np->n_rcred);
if (np->n_wcred)
crfree(np->n_wcred);
cache_purge(vp);
pool_put(&nfs_node_pool, vp->v_data);
vp->v_data = NULL;
return (0);
}
void
nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags)
{
KASSERT(flags & (GOP_SIZE_READ | GOP_SIZE_WRITE));
KASSERT((flags & (GOP_SIZE_READ | GOP_SIZE_WRITE))
!= (GOP_SIZE_READ | GOP_SIZE_WRITE));
*eobp = MAX(size, vp->v_size);
}
int
nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
struct ucred *cred)
{
return 0;
}
int
nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
{
int i;
for (i = 0; i < npages; i++) {
pmap_page_protect(pgs[i], VM_PROT_READ);
}
return genfs_gop_write(vp, pgs, npages, flags);
}
Reference in New Issue View Git Blame Copy Permalink