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NetBSD/sys/miscfs/genfs/genfs_vnops.c

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/* $NetBSD: genfs_vnops.c,v 1.20 2000/09/19 22:01:59 fvdl Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*
*/
#include "opt_nfsserver.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/poll.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#ifdef NFSSERVER
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nqnfs.h>
#include <nfs/nfs_var.h>
#endif
int
genfs_poll(v)
void *v;
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
struct proc *a_p;
} */ *ap = v;
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
int
genfs_fsync(v)
void *v;
{
struct vop_fsync_args /* {
struct vnode *a_vp;
struct ucred *a_cred;
int a_flags;
off_t offlo;
off_t offhi;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
int wait;
wait = (ap->a_flags & FSYNC_WAIT) != 0;
vflushbuf(vp, wait);
if ((ap->a_flags & FSYNC_DATAONLY) != 0)
return (0);
else
return (VOP_UPDATE(vp, NULL, NULL, wait ? UPDATE_WAIT : 0));
}
int
genfs_seek(v)
void *v;
{
struct vop_seek_args /* {
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
struct ucred *a_ucred;
} */ *ap = v;
if (ap->a_newoff < 0)
return (EINVAL);
return (0);
}
int
genfs_abortop(v)
void *v;
{
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap = v;
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
return (0);
}
int
genfs_fcntl(v)
void *v;
{
struct vop_fcntl_args /* {
struct vnode *a_vp;
u_int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
if (ap->a_command == F_SETFL)
return (0);
else
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
genfs_badop(v)
void *v;
{
panic("genfs: bad op");
}
/*ARGSUSED*/
int
genfs_nullop(v)
void *v;
{
return (0);
}
/*ARGSUSED*/
int
genfs_einval(v)
void *v;
{
return (EINVAL);
}
/*ARGSUSED*/
int
genfs_eopnotsupp(v)
void *v;
{
return (EOPNOTSUPP);
}
/*
* Called when an fs doesn't support a particular vop but the vop needs to
* vrele, vput, or vunlock passed in vnodes.
*/
int
genfs_eopnotsupp_rele(v)
void *v;
{
struct vop_generic_args /*
struct vnodeop_desc *a_desc;
/ * other random data follows, presumably * /
} */ *ap = v;
struct vnodeop_desc *desc = ap->a_desc;
struct vnode *vp;
int flags, i, j, offset;
flags = desc->vdesc_flags;
for (i = 0; i < VDESC_MAX_VPS; flags >>=1, i++) {
if ((offset = desc->vdesc_vp_offsets[i]) == VDESC_NO_OFFSET)
break; /* stop at end of list */
if ((j = flags & VDESC_VP0_WILLPUT)) {
vp = *VOPARG_OFFSETTO(struct vnode**,offset,ap);
switch (j) {
case VDESC_VP0_WILLPUT:
vput(vp);
break;
case VDESC_VP0_WILLUNLOCK:
VOP_UNLOCK(vp, 0);
break;
case VDESC_VP0_WILLRELE:
vrele(vp);
break;
}
}
}
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
genfs_ebadf(v)
void *v;
{
return (EBADF);
}
/* ARGSUSED */
int
genfs_enoioctl(v)
void *v;
{
return (ENOTTY);
}
/*
* Eliminate all activity associated with the requested vnode
* and with all vnodes aliased to the requested vnode.
*/
int
genfs_revoke(v)
void *v;
{
struct vop_revoke_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp, *vq;
struct proc *p = curproc; /* XXX */
#ifdef DIAGNOSTIC
if ((ap->a_flags & REVOKEALL) == 0)
panic("genfs_revoke: not revokeall");
#endif
vp = ap->a_vp;
simple_lock(&vp->v_interlock);
if (vp->v_flag & VALIASED) {
/*
* If a vgone (or vclean) is already in progress,
* wait until it is done and return.
*/
if (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
simple_unlock(&vp->v_interlock);
tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
return (0);
}
/*
* Ensure that vp will not be vgone'd while we
* are eliminating its aliases.
*/
vp->v_flag |= VXLOCK;
simple_unlock(&vp->v_interlock);
while (vp->v_flag & VALIASED) {
simple_lock(&spechash_slock);
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type || vp == vq)
continue;
simple_unlock(&spechash_slock);
vgone(vq);
break;
}
if (vq == NULLVP)
simple_unlock(&spechash_slock);
}
/*
* Remove the lock so that vgone below will
* really eliminate the vnode after which time
* vgone will awaken any sleepers.
*/
simple_lock(&vp->v_interlock);
vp->v_flag &= ~VXLOCK;
}
vgonel(vp, p);
return (0);
}
/*
* Lock the node.
*/
int
genfs_lock(v)
void *v;
{
struct vop_lock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock));
}
/*
* Unlock the node.
*/
int
genfs_unlock(v)
void *v;
{
struct vop_unlock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE,
&vp->v_interlock));
}
/*
* Return whether or not the node is locked.
*/
int
genfs_islocked(v)
void *v;
{
struct vop_islocked_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockstatus(&vp->v_lock));
}
/*
* Stubs to use when there is no locking to be done on the underlying object.
*/
int
genfs_nolock(v)
void *v;
{
struct vop_lock_args /* {
struct vnode *a_vp;
int a_flags;
struct proc *a_p;
} */ *ap = v;
/*
* Since we are not using the lock manager, we must clear
* the interlock here.
*/
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&ap->a_vp->v_interlock);
return (0);
}
int
genfs_nounlock(v)
void *v;
{
return (0);
}
int
genfs_noislocked(v)
void *v;
{
return (0);
}
/*
* Local lease check for NFS servers. Just set up args and let
* nqsrv_getlease() do the rest. If NFSSERVER is not in the kernel,
* this is a null operation.
*/
int
genfs_lease_check(v)
void *v;
{
#ifdef NFSSERVER
struct vop_lease_args /* {
struct vnode *a_vp;
struct proc *a_p;
struct ucred *a_cred;
int a_flag;
} */ *ap = v;
u_int32_t duration = 0;
int cache;
u_quad_t frev;
(void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
NQLOCALSLP, ap->a_p, (struct mbuf *)0, &cache, &frev, ap->a_cred);
return (0);
#else
return (0);
#endif /* NFSSERVER */
}
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