415 lines
8.1 KiB
C
415 lines
8.1 KiB
C
/* $NetBSD: genfs_vnops.c,v 1.16 2000/03/30 12:22:14 augustss Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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*/
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#include "opt_nfsserver.h"
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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/kernel.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/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/specfs/specdev.h>
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#ifdef NFSSERVER
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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/nqnfs.h>
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#include <nfs/nfs_var.h>
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#endif
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int
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genfs_poll(v)
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void *v;
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{
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct proc *a_p;
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} */ *ap = v;
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return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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int
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genfs_fsync(v)
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void *v;
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{
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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struct ucred *a_cred;
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int a_flags;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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int wait;
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wait = (ap->a_flags & FSYNC_WAIT) != 0;
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vflushbuf(vp, wait);
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if ((ap->a_flags & FSYNC_DATAONLY) != 0)
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return (0);
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else
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return (VOP_UPDATE(ap->a_vp, NULL, NULL, wait));
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}
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int
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genfs_seek(v)
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void *v;
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{
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struct vop_seek_args /* {
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struct vnode *a_vp;
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off_t a_oldoff;
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off_t a_newoff;
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struct ucred *a_ucred;
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} */ *ap = v;
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if (ap->a_newoff < 0)
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return (EINVAL);
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return (0);
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}
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int
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genfs_abortop(v)
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void *v;
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{
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struct vop_abortop_args /* {
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struct vnode *a_dvp;
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struct componentname *a_cnp;
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} */ *ap = v;
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if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
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FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
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return (0);
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}
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int
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genfs_fcntl(v)
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void *v;
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{
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struct vop_fcntl_args /* {
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struct vnode *a_vp;
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u_int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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if (ap->a_command == F_SETFL)
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return (0);
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else
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return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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genfs_badop(v)
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void *v;
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{
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panic("genfs: bad op");
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}
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/*ARGSUSED*/
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int
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genfs_nullop(v)
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void *v;
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{
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return (0);
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}
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/*ARGSUSED*/
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int
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genfs_einval(v)
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void *v;
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{
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return (EINVAL);
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}
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/*ARGSUSED*/
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int
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genfs_eopnotsupp(v)
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void *v;
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{
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return (EOPNOTSUPP);
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}
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/*
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* Called when an fs doesn't support a particular vop but the vop needs to
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* vrele, vput, or vunlock passed in vnodes.
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*/
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int
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genfs_eopnotsupp_rele(v)
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void *v;
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{
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struct vop_generic_args /*
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struct vnodeop_desc *a_desc;
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/ * other random data follows, presumably * /
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} */ *ap = v;
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struct vnodeop_desc *desc = ap->a_desc;
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struct vnode *vp;
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int flags, i, j, offset;
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flags = desc->vdesc_flags;
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for (i = 0; i < VDESC_MAX_VPS; flags >>=1, i++) {
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if ((offset = desc->vdesc_vp_offsets[i]) == VDESC_NO_OFFSET)
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break; /* stop at end of list */
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if ((j = flags & VDESC_VP0_WILLPUT)) {
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vp = *VOPARG_OFFSETTO(struct vnode**,offset,ap);
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switch (j) {
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case VDESC_VP0_WILLPUT:
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vput(vp);
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break;
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case VDESC_VP0_WILLUNLOCK:
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VOP_UNLOCK(vp, 0);
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break;
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case VDESC_VP0_WILLRELE:
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vrele(vp);
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break;
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}
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}
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}
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return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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genfs_ebadf(v)
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void *v;
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{
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return (EBADF);
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}
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/* ARGSUSED */
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int
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genfs_enoioctl(v)
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void *v;
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{
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return (ENOTTY);
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}
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/*
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* Eliminate all activity associated with the requested vnode
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* and with all vnodes aliased to the requested vnode.
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*/
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int
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genfs_revoke(v)
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void *v;
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{
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struct vop_revoke_args /* {
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struct vnode *a_vp;
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int a_flags;
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} */ *ap = v;
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struct vnode *vp, *vq;
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struct proc *p = curproc; /* XXX */
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#ifdef DIAGNOSTIC
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if ((ap->a_flags & REVOKEALL) == 0)
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panic("genfs_revoke: not revokeall");
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#endif
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vp = ap->a_vp;
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simple_lock(&vp->v_interlock);
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if (vp->v_flag & VALIASED) {
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/*
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* If a vgone (or vclean) is already in progress,
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* wait until it is done and return.
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*/
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if (vp->v_flag & VXLOCK) {
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vp->v_flag |= VXWANT;
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simple_unlock(&vp->v_interlock);
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tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
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return (0);
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}
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/*
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* Ensure that vp will not be vgone'd while we
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* are eliminating its aliases.
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*/
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vp->v_flag |= VXLOCK;
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simple_unlock(&vp->v_interlock);
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while (vp->v_flag & VALIASED) {
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simple_lock(&spechash_slock);
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for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
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if (vq->v_rdev != vp->v_rdev ||
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vq->v_type != vp->v_type || vp == vq)
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continue;
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simple_unlock(&spechash_slock);
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vgone(vq);
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break;
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}
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if (vq == NULLVP)
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simple_unlock(&spechash_slock);
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}
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/*
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* Remove the lock so that vgone below will
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* really eliminate the vnode after which time
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* vgone will awaken any sleepers.
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*/
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simple_lock(&vp->v_interlock);
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vp->v_flag &= ~VXLOCK;
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}
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vgonel(vp, p);
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return (0);
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}
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/*
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* Lock the node.
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*/
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int
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genfs_lock(v)
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void *v;
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{
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock));
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}
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/*
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* Unlock the node.
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*/
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int
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genfs_unlock(v)
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void *v;
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{
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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int a_flags;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE,
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&vp->v_interlock));
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}
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/*
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* Return whether or not the node is locked.
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*/
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int
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genfs_islocked(v)
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void *v;
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{
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struct vop_islocked_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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return (lockstatus(&vp->v_lock));
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}
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/*
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* Stubs to use when there is no locking to be done on the underlying object.
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*/
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int
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genfs_nolock(v)
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void *v;
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{
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap = v;
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/*
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* Since we are not using the lock manager, we must clear
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* the interlock here.
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*/
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if (ap->a_flags & LK_INTERLOCK)
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simple_unlock(&ap->a_vp->v_interlock);
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return (0);
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}
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int
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genfs_nounlock(v)
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void *v;
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{
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return (0);
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}
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int
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genfs_noislocked(v)
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void *v;
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{
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return (0);
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}
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/*
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* Local lease check for NFS servers. Just set up args and let
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* nqsrv_getlease() do the rest. If NFSSERVER is not in the kernel,
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* this is a null operation.
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*/
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int
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genfs_lease_check(v)
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void *v;
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{
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#ifdef NFSSERVER
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struct vop_lease_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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struct ucred *a_cred;
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int a_flag;
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} */ *ap = v;
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u_int32_t duration = 0;
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int cache;
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u_quad_t frev;
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(void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
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NQLOCALSLP, ap->a_p, (struct mbuf *)0, &cache, &frev, ap->a_cred);
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return (0);
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#else
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return (0);
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#endif /* NFSSERVER */
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}
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