382 lines
9.3 KiB
C
382 lines
9.3 KiB
C
/*
|
|
* 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 8.6 (Berkeley) 5/22/95
|
|
* $Id: nfs_node.c,v 1.21 1997/10/12 20:25:40 phk Exp $
|
|
*/
|
|
|
|
|
|
#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/malloc.h>
|
|
|
|
#include <nfs/rpcv2.h>
|
|
#include <nfs/nfsproto.h>
|
|
#include <nfs/nfs.h>
|
|
#include <nfs/nfsnode.h>
|
|
#include <nfs/nfsmount.h>
|
|
|
|
static MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part");
|
|
|
|
LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
|
|
u_long nfsnodehash;
|
|
|
|
#define TRUE 1
|
|
#define FALSE 0
|
|
|
|
/*
|
|
* Initialize hash links for nfsnodes
|
|
* and build nfsnode free list.
|
|
*/
|
|
void
|
|
nfs_nhinit()
|
|
{
|
|
|
|
#ifndef lint
|
|
if ((sizeof(struct nfsnode) - 1) & sizeof(struct nfsnode))
|
|
printf("nfs_nhinit: bad size %d\n", sizeof(struct nfsnode));
|
|
#endif /* not lint */
|
|
nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
|
|
}
|
|
|
|
/*
|
|
* Compute an entry in the NFS hash table structure
|
|
*/
|
|
u_long
|
|
nfs_hash(fhp, fhsize)
|
|
register nfsfh_t *fhp;
|
|
int fhsize;
|
|
{
|
|
register u_char *fhpp;
|
|
register u_long fhsum;
|
|
register int i;
|
|
|
|
fhpp = &fhp->fh_bytes[0];
|
|
fhsum = 0;
|
|
for (i = 0; i < fhsize; i++)
|
|
fhsum += *fhpp++;
|
|
return (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.
|
|
*/
|
|
int nfs_node_hash_lock;
|
|
|
|
int
|
|
nfs_nget(mntp, fhp, fhsize, npp)
|
|
struct mount *mntp;
|
|
register nfsfh_t *fhp;
|
|
int fhsize;
|
|
struct nfsnode **npp;
|
|
{
|
|
struct proc *p = curproc; /* XXX */
|
|
struct nfsnode *np;
|
|
struct nfsnodehashhead *nhpp;
|
|
register struct vnode *vp;
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
nhpp = NFSNOHASH(nfs_hash(fhp, fhsize));
|
|
loop:
|
|
for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
|
|
if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
|
|
bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
|
|
continue;
|
|
vp = NFSTOV(np);
|
|
if (vget(vp, LK_EXCLUSIVE, p))
|
|
goto loop;
|
|
*npp = np;
|
|
return(0);
|
|
}
|
|
/*
|
|
* Obtain a lock to prevent a race condition if the getnewvnode()
|
|
* or MALLOC() below happens to block.
|
|
*/
|
|
if (nfs_node_hash_lock) {
|
|
while (nfs_node_hash_lock) {
|
|
nfs_node_hash_lock = -1;
|
|
tsleep(&nfs_node_hash_lock, PVM, "nfsngt", 0);
|
|
}
|
|
goto loop;
|
|
}
|
|
nfs_node_hash_lock = 1;
|
|
|
|
/*
|
|
* Do the MALLOC before the getnewvnode since doing so afterward
|
|
* might cause a bogus v_data pointer to get dereferenced
|
|
* elsewhere if MALLOC should block.
|
|
*/
|
|
MALLOC(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
|
|
|
|
error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
|
|
if (error) {
|
|
if (nfs_node_hash_lock < 0)
|
|
wakeup(&nfs_node_hash_lock);
|
|
nfs_node_hash_lock = 0;
|
|
*npp = 0;
|
|
FREE(np, M_NFSNODE);
|
|
return (error);
|
|
}
|
|
vp = nvp;
|
|
bzero((caddr_t)np, sizeof *np);
|
|
vp->v_data = np;
|
|
np->n_vnode = vp;
|
|
/*
|
|
* Insert the nfsnode in the hash queue for its new file handle
|
|
*/
|
|
LIST_INSERT_HEAD(nhpp, np, n_hash);
|
|
if (fhsize > NFS_SMALLFH) {
|
|
MALLOC(np->n_fhp, nfsfh_t *, fhsize, M_NFSBIGFH, M_WAITOK);
|
|
} else
|
|
np->n_fhp = &np->n_fh;
|
|
bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
|
|
np->n_fhsize = fhsize;
|
|
*npp = np;
|
|
|
|
if (nfs_node_hash_lock < 0)
|
|
wakeup(&nfs_node_hash_lock);
|
|
nfs_node_hash_lock = 0;
|
|
|
|
/*
|
|
* Lock the new nfsnode.
|
|
*/
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nfs_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct nfsnode *np;
|
|
register struct sillyrename *sp;
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
np = VTONFS(ap->a_vp);
|
|
if (prtactive && ap->a_vp->v_usecount != 0)
|
|
vprint("nfs_inactive: pushing active", ap->a_vp);
|
|
if (ap->a_vp->v_type != VDIR) {
|
|
sp = np->n_sillyrename;
|
|
np->n_sillyrename = (struct sillyrename *)0;
|
|
} else
|
|
sp = (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);
|
|
FREE((caddr_t)sp, M_NFSREQ);
|
|
}
|
|
np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
|
|
NQNFSNONCACHE | NQNFSWRITE);
|
|
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Reclaim an nfsnode so that it can be used for other purposes.
|
|
*/
|
|
int
|
|
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);
|
|
register struct nfsdmap *dp, *dp2;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Free up any directory cookie structures and
|
|
* large file handle structures that might be associated with
|
|
* this nfs node.
|
|
*/
|
|
if (vp->v_type == VDIR) {
|
|
dp = np->n_cookies.lh_first;
|
|
while (dp) {
|
|
dp2 = dp;
|
|
dp = dp->ndm_list.le_next;
|
|
FREE((caddr_t)dp2, M_NFSDIROFF);
|
|
}
|
|
}
|
|
if (np->n_fhsize > NFS_SMALLFH) {
|
|
FREE((caddr_t)np->n_fhp, M_NFSBIGFH);
|
|
}
|
|
|
|
cache_purge(vp);
|
|
FREE(vp->v_data, M_NFSNODE);
|
|
vp->v_data = (void *)0;
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* Lock an nfsnode
|
|
*/
|
|
int
|
|
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;
|
|
(void) tsleep((caddr_t)vp, PINOD, "nfslck", 0);
|
|
}
|
|
if (vp->v_tag == VT_NON)
|
|
return (ENOENT);
|
|
|
|
#if 0
|
|
/*
|
|
* Only lock regular files. If a server crashed while we were
|
|
* holding a directory lock, we could easily end up sleeping
|
|
* until the server rebooted while holding a lock on the root.
|
|
* Locks are only needed for protecting critical sections in
|
|
* VMIO at the moment.
|
|
* New vnodes will have type VNON but they should be locked
|
|
* since they may become VREG. This is checked in loadattrcache
|
|
* and unwanted locks are released there.
|
|
*/
|
|
if (vp->v_type == VREG || vp->v_type == VNON) {
|
|
while (np->n_flag & NLOCKED) {
|
|
np->n_flag |= NWANTED;
|
|
(void) tsleep((caddr_t) np, PINOD, "nfslck2", 0);
|
|
/*
|
|
* If the vnode has transmuted into a VDIR while we
|
|
* were asleep, then skip the lock.
|
|
*/
|
|
if (vp->v_type != VREG && vp->v_type != VNON)
|
|
return (0);
|
|
}
|
|
np->n_flag |= NLOCKED;
|
|
}
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unlock an nfsnode
|
|
*/
|
|
int
|
|
nfs_unlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
#if 0
|
|
struct vnode* vp = ap->a_vp;
|
|
struct nfsnode* np = VTONFS(vp);
|
|
|
|
if (vp->v_type == VREG || vp->v_type == VNON) {
|
|
if (!(np->n_flag & NLOCKED))
|
|
panic("nfs_unlock: nfsnode not locked");
|
|
np->n_flag &= ~NLOCKED;
|
|
if (np->n_flag & NWANTED) {
|
|
np->n_flag &= ~NWANTED;
|
|
wakeup((caddr_t) np);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check for a locked nfsnode
|
|
*/
|
|
int
|
|
nfs_islocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
zfree(namei_zone, ap->a_cnp->cn_pnbuf);
|
|
return (0);
|
|
}
|