503 lines
10 KiB
C
503 lines
10 KiB
C
/* $NetBSD: genfs_vnops.c,v 1.167 2008/04/28 20:24:08 martin Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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. 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 <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.167 2008/04/28 20:24:08 martin Exp $");
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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/kmem.h>
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#include <sys/poll.h>
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#include <sys/mman.h>
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#include <sys/file.h>
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#include <sys/kauth.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/genfs/genfs_node.h>
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#include <miscfs/specfs/specdev.h>
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#include <uvm/uvm.h>
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#include <uvm/uvm_pager.h>
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static void filt_genfsdetach(struct knote *);
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static int filt_genfsread(struct knote *, long);
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static int filt_genfsvnode(struct knote *, long);
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int
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genfs_poll(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 lwp *a_l;
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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_seek(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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kauth_cred_t cred;
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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(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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PNBUF_PUT(ap->a_cnp->cn_pnbuf);
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return (0);
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}
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int
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genfs_fcntl(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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void *a_data;
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int a_fflag;
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kauth_cred_t a_cred;
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struct lwp *a_l;
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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(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(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(void *v)
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{
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return (EINVAL);
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}
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/*
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* Called when an fs doesn't support a particular vop.
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* This takes care to vrele, vput, or vunlock passed in vnodes.
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*/
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int
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genfs_eopnotsupp(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, *vp_last = NULL;
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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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/* Skip if NULL */
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if (!vp)
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continue;
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switch (j) {
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case VDESC_VP0_WILLPUT:
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/* Check for dvp == vp cases */
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if (vp == vp_last)
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vrele(vp);
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else {
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vput(vp);
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vp_last = vp;
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}
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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(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(void *v)
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{
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return (EPASSTHROUGH);
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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(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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#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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vrevoke(ap->a_vp);
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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(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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int flags = ap->a_flags;
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if ((flags & LK_INTERLOCK) != 0) {
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flags &= ~LK_INTERLOCK;
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mutex_exit(&vp->v_interlock);
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}
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return (vlockmgr(vp->v_vnlock, flags));
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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(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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KASSERT(ap->a_flags == 0);
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return (vlockmgr(vp->v_vnlock, LK_RELEASE));
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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(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 (vlockstatus(vp->v_vnlock));
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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(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 lwp *a_l;
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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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mutex_exit(&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(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(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_mmap(void *v)
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{
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return (0);
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}
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void
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genfs_node_init(struct vnode *vp, const struct genfs_ops *ops)
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{
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struct genfs_node *gp = VTOG(vp);
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rw_init(&gp->g_glock);
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gp->g_op = ops;
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}
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void
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genfs_node_destroy(struct vnode *vp)
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{
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struct genfs_node *gp = VTOG(vp);
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rw_destroy(&gp->g_glock);
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}
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void
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genfs_size(struct vnode *vp, off_t size, off_t *eobp, int flags)
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{
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int bsize;
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bsize = 1 << vp->v_mount->mnt_fs_bshift;
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*eobp = (size + bsize - 1) & ~(bsize - 1);
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}
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static void
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filt_genfsdetach(struct knote *kn)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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mutex_enter(&vp->v_interlock);
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SLIST_REMOVE(&vp->v_klist, kn, knote, kn_selnext);
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mutex_exit(&vp->v_interlock);
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}
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static int
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filt_genfsread(struct knote *kn, long hint)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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int rv;
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/*
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* filesystem is gone, so set the EOF flag and schedule
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* the knote for deletion.
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*/
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switch (hint) {
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case NOTE_REVOKE:
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KASSERT(mutex_owned(&vp->v_interlock));
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kn->kn_flags |= (EV_EOF | EV_ONESHOT);
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return (1);
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case 0:
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mutex_enter(&vp->v_interlock);
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kn->kn_data = vp->v_size - ((file_t *)kn->kn_obj)->f_offset;
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rv = (kn->kn_data != 0);
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mutex_exit(&vp->v_interlock);
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return rv;
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default:
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KASSERT(mutex_owned(&vp->v_interlock));
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kn->kn_data = vp->v_size - ((file_t *)kn->kn_obj)->f_offset;
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return (kn->kn_data != 0);
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}
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}
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static int
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filt_genfsvnode(struct knote *kn, long hint)
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{
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struct vnode *vp = (struct vnode *)kn->kn_hook;
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int fflags;
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switch (hint) {
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case NOTE_REVOKE:
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KASSERT(mutex_owned(&vp->v_interlock));
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kn->kn_flags |= EV_EOF;
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if ((kn->kn_sfflags & hint) != 0)
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kn->kn_fflags |= hint;
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return (1);
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case 0:
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mutex_enter(&vp->v_interlock);
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fflags = kn->kn_fflags;
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mutex_exit(&vp->v_interlock);
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break;
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default:
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KASSERT(mutex_owned(&vp->v_interlock));
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if ((kn->kn_sfflags & hint) != 0)
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kn->kn_fflags |= hint;
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fflags = kn->kn_fflags;
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break;
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}
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return (fflags != 0);
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}
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static const struct filterops genfsread_filtops =
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{ 1, NULL, filt_genfsdetach, filt_genfsread };
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static const struct filterops genfsvnode_filtops =
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{ 1, NULL, filt_genfsdetach, filt_genfsvnode };
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int
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genfs_kqfilter(void *v)
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{
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struct vop_kqfilter_args /* {
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struct vnode *a_vp;
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struct knote *a_kn;
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} */ *ap = v;
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struct vnode *vp;
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struct knote *kn;
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vp = ap->a_vp;
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kn = ap->a_kn;
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switch (kn->kn_filter) {
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case EVFILT_READ:
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kn->kn_fop = &genfsread_filtops;
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break;
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case EVFILT_VNODE:
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kn->kn_fop = &genfsvnode_filtops;
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break;
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default:
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return (EINVAL);
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}
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kn->kn_hook = vp;
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mutex_enter(&vp->v_interlock);
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SLIST_INSERT_HEAD(&vp->v_klist, kn, kn_selnext);
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mutex_exit(&vp->v_interlock);
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return (0);
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}
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void
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genfs_node_wrlock(struct vnode *vp)
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{
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struct genfs_node *gp = VTOG(vp);
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rw_enter(&gp->g_glock, RW_WRITER);
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}
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void
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genfs_node_rdlock(struct vnode *vp)
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{
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struct genfs_node *gp = VTOG(vp);
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rw_enter(&gp->g_glock, RW_READER);
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}
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void
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genfs_node_unlock(struct vnode *vp)
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{
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struct genfs_node *gp = VTOG(vp);
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rw_exit(&gp->g_glock);
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}
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