1860 lines
42 KiB
C
1860 lines
42 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994, 1995 Jan-Simon Pendry.
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* Copyright (c) 1992, 1993, 1994, 1995
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* The Regents of the University of California.
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* Copyright (c) 2005, 2006 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
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* Copyright (c) 2006 Daichi Goto <daichi@freebsd.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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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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* 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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* @(#)union_vnops.c 8.32 (Berkeley) 6/23/95
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* $FreeBSD: src/sys/fs/unionfs/union_vnops.c,v 1.152 2008/01/13 14:44:06 attilio Exp $
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/buf.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/dirent.h>
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#include <sys/proc.h>
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#include <fs/unionfs/unionfs.h>
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#if 0
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#define UNIONFS_INTERNAL_DEBUG(msg, args...) printf(msg, ## args)
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#define UNIONFS_IDBG_RENAME
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#else
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#define UNIONFS_INTERNAL_DEBUG(msg, args...)
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#endif
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static int
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unionfs_lookup(void *v)
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{
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struct vop_lookup_args *ap = v;
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int iswhiteout;
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int lockflag;
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int error , uerror, lerror;
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u_long nameiop;
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u_long cnflags, cnflagsbk;
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struct unionfs_node *dunp;
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struct vnode *dvp, *udvp, *ldvp, *vp, *uvp, *lvp, *dtmpvp;
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struct vattr va;
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struct componentname *cnp;
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iswhiteout = 0;
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lockflag = 0;
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error = uerror = lerror = ENOENT;
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cnp = ap->a_cnp;
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nameiop = cnp->cn_nameiop;
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cnflags = cnp->cn_flags;
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dvp = ap->a_dvp;
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dunp = VTOUNIONFS(dvp);
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udvp = dunp->un_uppervp;
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ldvp = dunp->un_lowervp;
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vp = uvp = lvp = NULLVP;
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*(ap->a_vpp) = NULLVP;
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: enter: nameiop=%ld, flags=%lx, path=%s\n", nameiop, cnflags, cnp->cn_nameptr);
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if (dvp->v_type != VDIR)
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return (ENOTDIR);
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/*
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* If read-only and op is not LOOKUP, will return EROFS.
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*/
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if ((cnflags & ISLASTCN) &&
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(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
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LOOKUP != nameiop)
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return (EROFS);
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/*
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* lookup dotdot
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*/
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if (cnflags & ISDOTDOT) {
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if (LOOKUP != nameiop && udvp == NULLVP)
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return (EROFS);
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if (udvp != NULLVP) {
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dtmpvp = udvp;
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if (ldvp != NULLVP)
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VOP_UNLOCK(ldvp);
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}
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else
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dtmpvp = ldvp;
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error = VOP_LOOKUP(dtmpvp, &vp, cnp);
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if (dtmpvp == udvp && ldvp != NULLVP) {
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VOP_UNLOCK(udvp);
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vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
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}
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if (error == 0) {
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/*
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* Exchange lock and reference from vp to
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* dunp->un_dvp. vp is upper/lower vnode, but it
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* will need to return the unionfs vnode.
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*/
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if (nameiop == DELETE || nameiop == RENAME)
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VOP_UNLOCK(vp);
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vrele(vp);
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VOP_UNLOCK(dvp);
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*(ap->a_vpp) = dunp->un_dvp;
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vref(dunp->un_dvp);
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vn_lock(dunp->un_dvp, LK_EXCLUSIVE | LK_RETRY);
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vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
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} else if (error == ENOENT && nameiop != CREATE)
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cache_enter(dvp, NULLVP, cnp->cn_nameptr,
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cnp->cn_namelen, cnp->cn_flags);
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", error);
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return (error);
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}
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/*
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* lookup upper layer
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*/
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if (udvp != NULLVP) {
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uerror = VOP_LOOKUP(udvp, &uvp, cnp);
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if (uerror == 0) {
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if (udvp == uvp) { /* is dot */
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vrele(uvp);
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*(ap->a_vpp) = dvp;
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vref(dvp);
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", uerror);
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return (uerror);
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}
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}
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/* check whiteout */
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if (uerror == ENOENT || uerror == EJUSTRETURN)
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if (cnp->cn_flags & ISWHITEOUT)
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iswhiteout = 1; /* don't lookup lower */
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if (iswhiteout == 0 && ldvp != NULLVP)
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if (VOP_GETATTR(udvp, &va, cnp->cn_cred) == 0 &&
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(va.va_flags & OPAQUE))
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iswhiteout = 1; /* don't lookup lower */
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#if 0
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: debug: whiteout=%d, path=%s\n", iswhiteout, cnp->cn_nameptr);
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#endif
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}
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/*
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* lookup lower layer
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*/
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if (ldvp != NULLVP && !(cnflags & DOWHITEOUT) && iswhiteout == 0) {
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/* always op is LOOKUP */
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cnp->cn_nameiop = LOOKUP;
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cnflagsbk = cnp->cn_flags;
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cnp->cn_flags = cnflags;
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lerror = VOP_LOOKUP(ldvp, &lvp, cnp);
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cnp->cn_nameiop = nameiop;
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if (udvp != NULLVP && (uerror == 0 || uerror == EJUSTRETURN))
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cnp->cn_flags = cnflagsbk;
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if (lerror == 0) {
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if (ldvp == lvp) { /* is dot */
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if (uvp != NULLVP)
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vrele(uvp); /* no need? */
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vrele(lvp);
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*(ap->a_vpp) = dvp;
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vref(dvp);
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", lerror);
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if (uvp != NULL)
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VOP_UNLOCK(uvp);
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return (lerror);
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}
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}
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}
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/*
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* check lookup result
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*/
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if (uvp == NULLVP && lvp == NULLVP) {
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n",
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(udvp != NULLVP ? uerror : lerror));
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return (udvp != NULLVP ? uerror : lerror);
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}
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/*
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* check vnode type
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*/
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if (uvp != NULLVP && lvp != NULLVP && uvp->v_type != lvp->v_type) {
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vput(lvp);
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lvp = NULLVP;
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}
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/*
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* check shadow dir
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*/
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if (uerror != 0 && uerror != EJUSTRETURN && udvp != NULLVP &&
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lerror == 0 && lvp != NULLVP && lvp->v_type == VDIR &&
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!(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
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(1 < cnp->cn_namelen || '.' != *(cnp->cn_nameptr))) {
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/* get unionfs vnode in order to create a new shadow dir. */
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error = unionfs_nodeget(dvp->v_mount, NULLVP, lvp, dvp, &vp,
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cnp);
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if (error != 0)
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goto unionfs_lookup_out;
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error = unionfs_mkshadowdir(MOUNTTOUNIONFSMOUNT(dvp->v_mount),
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udvp, VTOUNIONFS(vp), cnp);
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if (error != 0) {
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UNIONFSDEBUG("unionfs_lookup: Unable to create shadow dir.");
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vput(vp);
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goto unionfs_lookup_out;
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}
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}
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/*
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* get unionfs vnode.
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*/
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else {
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if (uvp != NULLVP)
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error = uerror;
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else
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error = lerror;
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if (error != 0)
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goto unionfs_lookup_out;
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error = unionfs_nodeget(dvp->v_mount, uvp, lvp, dvp, &vp, cnp);
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if (error != 0) {
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UNIONFSDEBUG("unionfs_lookup: Unable to create unionfs vnode.");
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goto unionfs_lookup_out;
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}
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}
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*(ap->a_vpp) = vp;
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cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
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cnp->cn_flags);
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/* XXXAD lock status on error */
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unionfs_lookup_out:
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if (uvp != NULLVP)
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vrele(uvp);
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if (lvp != NULLVP)
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vrele(lvp);
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if (error == ENOENT && nameiop != CREATE)
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cache_enter(dvp, NULLVP, cnp->cn_nameptr, cnp->cn_namelen,
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cnp->cn_flags);
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UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", error);
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return (error);
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}
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static int
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unionfs_create(void *v)
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{
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struct vop_create_args *ap = v;
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struct unionfs_node *dunp;
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struct componentname *cnp;
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struct vnode *udvp;
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struct vnode *vp;
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int error;
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UNIONFS_INTERNAL_DEBUG("unionfs_create: enter\n");
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dunp = VTOUNIONFS(ap->a_dvp);
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cnp = ap->a_cnp;
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udvp = dunp->un_uppervp;
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error = EROFS;
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if (udvp != NULLVP) {
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if ((error = VOP_CREATE(udvp, &vp, cnp, ap->a_vap)) == 0) {
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error = unionfs_nodeget(ap->a_dvp->v_mount, vp, NULLVP,
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ap->a_dvp, ap->a_vpp, cnp);
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if (error) {
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vput(vp);
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} else {
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vrele(vp);
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}
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}
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}
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UNIONFS_INTERNAL_DEBUG("unionfs_create: leave (%d)\n", error);
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return (error);
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}
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static int
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unionfs_whiteout(void *v)
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{
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struct vop_whiteout_args *ap = v;
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struct unionfs_node *dunp;
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struct componentname *cnp;
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struct vnode *udvp;
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int error;
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UNIONFS_INTERNAL_DEBUG("unionfs_whiteout: enter\n");
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dunp = VTOUNIONFS(ap->a_dvp);
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cnp = ap->a_cnp;
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udvp = dunp->un_uppervp;
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error = EOPNOTSUPP;
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if (udvp != NULLVP) {
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switch (ap->a_flags) {
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case CREATE:
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case DELETE:
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case LOOKUP:
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error = VOP_WHITEOUT(udvp, cnp, ap->a_flags);
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break;
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default:
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error = EINVAL;
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break;
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}
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}
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UNIONFS_INTERNAL_DEBUG("unionfs_whiteout: leave (%d)\n", error);
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return (error);
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}
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static int
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unionfs_mknod(void *v)
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{
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struct vop_mknod_args *ap = v;
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struct unionfs_node *dunp;
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struct componentname *cnp;
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struct vnode *udvp;
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struct vnode *vp;
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int error;
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UNIONFS_INTERNAL_DEBUG("unionfs_mknod: enter\n");
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dunp = VTOUNIONFS(ap->a_dvp);
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cnp = ap->a_cnp;
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udvp = dunp->un_uppervp;
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error = EROFS;
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if (udvp != NULLVP) {
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if ((error = VOP_MKNOD(udvp, &vp, cnp, ap->a_vap)) == 0) {
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error = unionfs_nodeget(ap->a_dvp->v_mount, vp, NULLVP,
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ap->a_dvp, ap->a_vpp, cnp);
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if (error) {
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vput(vp);
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} else {
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vrele(vp);
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}
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}
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}
|
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UNIONFS_INTERNAL_DEBUG("unionfs_mknod: leave (%d)\n", error);
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|
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return (error);
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}
|
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|
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static int
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unionfs_open(void *v)
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{
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struct vop_open_args *ap = v;
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int error;
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struct unionfs_node *unp;
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struct unionfs_node_status *unsp;
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struct vnode *uvp;
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struct vnode *lvp;
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struct vnode *targetvp;
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kauth_cred_t cred;
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|
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UNIONFS_INTERNAL_DEBUG("unionfs_open: enter\n");
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error = 0;
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unp = VTOUNIONFS(ap->a_vp);
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uvp = unp->un_uppervp;
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lvp = unp->un_lowervp;
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targetvp = NULLVP;
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cred = ap->a_cred;
|
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|
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unionfs_get_node_status(unp, &unsp);
|
|
|
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if (unsp->uns_lower_opencnt > 0 || unsp->uns_upper_opencnt > 0) {
|
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/* vnode is already opend. */
|
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if (unsp->uns_upper_opencnt > 0)
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targetvp = uvp;
|
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else
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targetvp = lvp;
|
|
|
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if (targetvp == lvp &&
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(ap->a_mode & FWRITE) && lvp->v_type == VREG)
|
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targetvp = NULLVP;
|
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}
|
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if (targetvp == NULLVP) {
|
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if (uvp == NULLVP) {
|
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if ((ap->a_mode & FWRITE) && lvp->v_type == VREG) {
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error = unionfs_copyfile(unp,
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!(ap->a_mode & O_TRUNC), cred);
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if (error != 0)
|
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goto unionfs_open_abort;
|
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targetvp = uvp = unp->un_uppervp;
|
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} else
|
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targetvp = lvp;
|
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} else
|
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targetvp = uvp;
|
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}
|
|
|
|
error = VOP_OPEN(targetvp, ap->a_mode, cred);
|
|
if (error == 0) {
|
|
if (targetvp == uvp) {
|
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if (uvp->v_type == VDIR && lvp != NULLVP &&
|
|
unsp->uns_lower_opencnt <= 0) {
|
|
/* open lower for readdir */
|
|
error = VOP_OPEN(lvp, FREAD, cred);
|
|
if (error != 0) {
|
|
VOP_CLOSE(uvp, ap->a_mode, cred);
|
|
goto unionfs_open_abort;
|
|
}
|
|
unsp->uns_node_flag |= UNS_OPENL_4_READDIR;
|
|
unsp->uns_lower_opencnt++;
|
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}
|
|
unsp->uns_upper_opencnt++;
|
|
} else {
|
|
unsp->uns_lower_opencnt++;
|
|
unsp->uns_lower_openmode = ap->a_mode;
|
|
}
|
|
}
|
|
|
|
unionfs_open_abort:
|
|
if (error != 0)
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_open: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_close(void *v)
|
|
{
|
|
struct vop_close_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
kauth_cred_t cred;
|
|
struct vnode *ovp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_close: enter\n");
|
|
|
|
KASSERT(VOP_ISLOCKED(ap->a_vp) == LK_EXCLUSIVE);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
cred = ap->a_cred;
|
|
|
|
unionfs_get_node_status(unp, &unsp);
|
|
|
|
if (unsp->uns_lower_opencnt <= 0 && unsp->uns_upper_opencnt <= 0) {
|
|
#ifdef DIAGNOSTIC
|
|
printf("unionfs_close: warning: open count is 0\n");
|
|
#endif
|
|
if (unp->un_uppervp != NULLVP)
|
|
ovp = unp->un_uppervp;
|
|
else
|
|
ovp = unp->un_lowervp;
|
|
} else if (unsp->uns_upper_opencnt > 0)
|
|
ovp = unp->un_uppervp;
|
|
else
|
|
ovp = unp->un_lowervp;
|
|
|
|
error = VOP_CLOSE(ovp, ap->a_fflag, cred);
|
|
|
|
if (error != 0)
|
|
goto unionfs_close_abort;
|
|
|
|
if (ovp == unp->un_uppervp) {
|
|
unsp->uns_upper_opencnt--;
|
|
if (unsp->uns_upper_opencnt == 0) {
|
|
if (unsp->uns_node_flag & UNS_OPENL_4_READDIR) {
|
|
VOP_CLOSE(unp->un_lowervp, FREAD, cred);
|
|
unsp->uns_node_flag &= ~UNS_OPENL_4_READDIR;
|
|
unsp->uns_lower_opencnt--;
|
|
}
|
|
}
|
|
} else
|
|
unsp->uns_lower_opencnt--;
|
|
|
|
unionfs_close_abort:
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_close: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Check the access mode toward shadow file/dir.
|
|
*/
|
|
static int
|
|
unionfs_check_corrected_access(u_short mode, struct vattr *va, kauth_cred_t cred)
|
|
{
|
|
int result;
|
|
int error;
|
|
uid_t uid; /* upper side vnode's uid */
|
|
gid_t gid; /* upper side vnode's gid */
|
|
u_short vmode; /* upper side vnode's mode */
|
|
u_short mask;
|
|
|
|
mask = 0;
|
|
uid = va->va_uid;
|
|
gid = va->va_gid;
|
|
vmode = va->va_mode;
|
|
|
|
/* check owner */
|
|
if (kauth_cred_getuid(cred) == uid) {
|
|
if (mode & VEXEC)
|
|
mask |= S_IXUSR;
|
|
if (mode & VREAD)
|
|
mask |= S_IRUSR;
|
|
if (mode & VWRITE)
|
|
mask |= S_IWUSR;
|
|
return ((vmode & mask) == mask ? 0 : EACCES);
|
|
}
|
|
|
|
/* check group */
|
|
error = kauth_cred_ismember_gid(cred, gid, &result);
|
|
if (error != 0)
|
|
return error;
|
|
if (result) {
|
|
if (mode & VEXEC)
|
|
mask |= S_IXGRP;
|
|
if (mode & VREAD)
|
|
mask |= S_IRGRP;
|
|
if (mode & VWRITE)
|
|
mask |= S_IWGRP;
|
|
return ((vmode & mask) == mask ? 0 : EACCES);
|
|
}
|
|
|
|
/* check other */
|
|
if (mode & VEXEC)
|
|
mask |= S_IXOTH;
|
|
if (mode & VREAD)
|
|
mask |= S_IROTH;
|
|
if (mode & VWRITE)
|
|
mask |= S_IWOTH;
|
|
|
|
return ((vmode & mask) == mask ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
unionfs_access(void *v)
|
|
{
|
|
struct vop_access_args *ap = v;
|
|
struct unionfs_mount *ump;
|
|
struct unionfs_node *unp;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct vattr va;
|
|
int mode;
|
|
int error;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_access: enter\n");
|
|
|
|
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
mode = ap->a_mode;
|
|
error = EACCES;
|
|
|
|
if ((mode & VWRITE) &&
|
|
(ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)) {
|
|
switch (ap->a_vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
case VLNK:
|
|
return (EROFS);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (uvp != NULLVP) {
|
|
error = VOP_ACCESS(uvp, mode, ap->a_cred);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
if (lvp != NULLVP) {
|
|
if (mode & VWRITE) {
|
|
if (ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY) {
|
|
switch (ap->a_vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
case VLNK:
|
|
return (EROFS);
|
|
default:
|
|
break;
|
|
}
|
|
} else if (ap->a_vp->v_type == VREG || ap->a_vp->v_type == VDIR) {
|
|
/* check shadow file/dir */
|
|
if (ump->um_copymode != UNIONFS_TRANSPARENT) {
|
|
error = unionfs_create_uppervattr(ump,
|
|
lvp, &va, ap->a_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = unionfs_check_corrected_access(
|
|
mode, &va, ap->a_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
}
|
|
mode &= ~VWRITE;
|
|
mode |= VREAD; /* will copy to upper */
|
|
}
|
|
error = VOP_ACCESS(lvp, mode, ap->a_cred);
|
|
}
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_getattr(void *v)
|
|
{
|
|
struct vop_getattr_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_mount *ump;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct vattr va;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: enter\n");
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
|
|
if (uvp != NULLVP) {
|
|
if ((error = VOP_GETATTR(uvp, ap->a_vap, ap->a_cred)) == 0)
|
|
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
|
|
ap->a_vap->va_mode, ap->a_vap->va_uid,
|
|
ap->a_vap->va_gid, error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
error = VOP_GETATTR(lvp, ap->a_vap, ap->a_cred);
|
|
|
|
if (error == 0 && !(ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY)) {
|
|
/* correct the attr toward shadow file/dir. */
|
|
if (ap->a_vp->v_type == VREG || ap->a_vp->v_type == VDIR) {
|
|
unionfs_create_uppervattr_core(ump, ap->a_vap, &va);
|
|
ap->a_vap->va_mode = va.va_mode;
|
|
ap->a_vap->va_uid = va.va_uid;
|
|
ap->a_vap->va_gid = va.va_gid;
|
|
}
|
|
}
|
|
|
|
if (error == 0)
|
|
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
|
|
ap->a_vap->va_mode, ap->a_vap->va_uid, ap->a_vap->va_gid, error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_setattr(void *v)
|
|
{
|
|
struct vop_setattr_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct vattr *vap;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_setattr: enter\n");
|
|
|
|
error = EROFS;
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
vap = ap->a_vap;
|
|
|
|
if ((ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) &&
|
|
(vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
|
|
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
|
|
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL))
|
|
return (EROFS);
|
|
|
|
if (uvp == NULLVP && lvp->v_type == VREG) {
|
|
error = unionfs_copyfile(unp, (vap->va_size != 0),
|
|
ap->a_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
uvp = unp->un_uppervp;
|
|
}
|
|
|
|
if (uvp != NULLVP)
|
|
error = VOP_SETATTR(uvp, vap, ap->a_cred);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_setattr: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_read(void *v)
|
|
{
|
|
struct vop_read_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_read: enter\n"); */
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
error = VOP_READ(tvp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_read: leave (%d)\n", error); */
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_write(void *v)
|
|
{
|
|
struct vop_write_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_write: enter\n"); */
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
error = VOP_WRITE(tvp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_write: leave (%d)\n", error); */
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_ioctl(void *v)
|
|
{
|
|
struct vop_ioctl_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
struct vnode *ovp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: enter\n");
|
|
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
unionfs_get_node_status(unp, &unsp);
|
|
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
VOP_UNLOCK(ap->a_vp);
|
|
|
|
if (ovp == NULLVP)
|
|
return (EBADF);
|
|
|
|
error = VOP_IOCTL(ovp, ap->a_command, ap->a_data, ap->a_fflag,
|
|
ap->a_cred);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: lease (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_poll(void *v)
|
|
{
|
|
struct vop_poll_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
struct vnode *ovp;
|
|
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
unionfs_get_node_status(unp, &unsp);
|
|
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
VOP_UNLOCK(ap->a_vp);
|
|
|
|
if (ovp == NULLVP)
|
|
return (EBADF);
|
|
|
|
return (VOP_POLL(ovp, ap->a_events));
|
|
}
|
|
|
|
static int
|
|
unionfs_fsync(void *v)
|
|
{
|
|
struct vop_fsync_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
struct vnode *ovp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
unionfs_get_node_status(unp, &unsp);
|
|
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
|
|
if (ovp == NULLVP)
|
|
return (EBADF);
|
|
|
|
return (VOP_FSYNC(ovp, ap->a_cred, ap->a_flags, ap->a_offlo, ap->a_offhi));
|
|
}
|
|
|
|
static int
|
|
unionfs_remove(void *v)
|
|
{
|
|
struct vop_remove_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *dunp;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_mount *ump;
|
|
struct vnode *udvp;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct componentname *cnp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_remove: enter\n");
|
|
|
|
error = 0;
|
|
dunp = VTOUNIONFS(ap->a_dvp);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
udvp = dunp->un_uppervp;
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
cnp = ap->a_cnp;
|
|
|
|
if (udvp == NULLVP)
|
|
return (EROFS);
|
|
|
|
if (uvp != NULLVP) {
|
|
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
|
|
if (ump->um_whitemode == UNIONFS_WHITE_ALWAYS || lvp != NULLVP)
|
|
cnp->cn_flags |= DOWHITEOUT;
|
|
error = VOP_REMOVE(udvp, uvp, cnp);
|
|
} else if (lvp != NULLVP)
|
|
error = unionfs_mkwhiteout(udvp, cnp, unp->un_path);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_remove: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_link(void *v)
|
|
{
|
|
#if 0
|
|
struct vop_link_v2_args *ap = v;
|
|
int error;
|
|
int needrelookup;
|
|
struct unionfs_node *dunp;
|
|
struct unionfs_node *unp;
|
|
struct vnode *udvp;
|
|
struct vnode *uvp;
|
|
struct componentname *cnp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_link: enter\n");
|
|
|
|
error = 0;
|
|
needrelookup = 0;
|
|
dunp = VTOUNIONFS(ap->a_tdvp);
|
|
unp = NULL;
|
|
udvp = dunp->un_uppervp;
|
|
uvp = NULLVP;
|
|
cnp = ap->a_cnp;
|
|
|
|
if (udvp == NULLVP)
|
|
return (EROFS);
|
|
|
|
if (ap->a_vp->v_op != unionfs_vnodeop_p)
|
|
uvp = ap->a_vp;
|
|
else {
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
|
|
if (unp->un_uppervp == NULLVP) {
|
|
if (ap->a_vp->v_type != VREG)
|
|
return (EOPNOTSUPP);
|
|
|
|
error = unionfs_copyfile(unp, 1, cnp->cn_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
needrelookup = 1;
|
|
}
|
|
uvp = unp->un_uppervp;
|
|
}
|
|
|
|
if (needrelookup != 0)
|
|
error = unionfs_relookup_for_create(ap->a_tdvp, cnp);
|
|
|
|
if (error == 0)
|
|
error = VOP_LINK(udvp, uvp, cnp);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_link: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
#else
|
|
panic("XXXAD");
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
unionfs_rename(void *v)
|
|
{
|
|
struct vop_rename_args *ap = v;
|
|
int error;
|
|
struct vnode *fdvp;
|
|
struct vnode *fvp;
|
|
struct componentname *fcnp;
|
|
struct vnode *tdvp;
|
|
struct vnode *tvp;
|
|
struct componentname *tcnp;
|
|
struct vnode *ltdvp;
|
|
struct vnode *ltvp;
|
|
|
|
/* rename target vnodes */
|
|
struct vnode *rfdvp;
|
|
struct vnode *rfvp;
|
|
struct vnode *rtdvp;
|
|
struct vnode *rtvp;
|
|
|
|
int needrelookup;
|
|
struct unionfs_mount *ump;
|
|
struct unionfs_node *unp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_rename: enter\n");
|
|
|
|
error = 0;
|
|
fdvp = ap->a_fdvp;
|
|
fvp = ap->a_fvp;
|
|
fcnp = ap->a_fcnp;
|
|
tdvp = ap->a_tdvp;
|
|
tvp = ap->a_tvp;
|
|
tcnp = ap->a_tcnp;
|
|
ltdvp = NULLVP;
|
|
ltvp = NULLVP;
|
|
rfdvp = fdvp;
|
|
rfvp = fvp;
|
|
rtdvp = tdvp;
|
|
rtvp = tvp;
|
|
needrelookup = 0;
|
|
|
|
/* check for cross device rename */
|
|
if (fvp->v_mount != tdvp->v_mount ||
|
|
(tvp != NULLVP && fvp->v_mount != tvp->v_mount)) {
|
|
error = EXDEV;
|
|
goto unionfs_rename_abort;
|
|
}
|
|
|
|
/* Renaming a file to itself has no effect. */
|
|
if (fvp == tvp)
|
|
goto unionfs_rename_abort;
|
|
|
|
/*
|
|
* from/to vnode is unionfs node.
|
|
*/
|
|
|
|
unp = VTOUNIONFS(fdvp);
|
|
#ifdef UNIONFS_IDBG_RENAME
|
|
UNIONFS_INTERNAL_DEBUG("fdvp=%p, ufdvp=%p, lfdvp=%p\n", fdvp, unp->un_uppervp, unp->un_lowervp);
|
|
#endif
|
|
if (unp->un_uppervp == NULLVP) {
|
|
error = ENODEV;
|
|
goto unionfs_rename_abort;
|
|
}
|
|
rfdvp = unp->un_uppervp;
|
|
vref(rfdvp);
|
|
|
|
unp = VTOUNIONFS(fvp);
|
|
#ifdef UNIONFS_IDBG_RENAME
|
|
UNIONFS_INTERNAL_DEBUG("fvp=%p, ufvp=%p, lfvp=%p\n", fvp, unp->un_uppervp, unp->un_lowervp);
|
|
#endif
|
|
ump = MOUNTTOUNIONFSMOUNT(fvp->v_mount);
|
|
if (unp->un_uppervp == NULLVP) {
|
|
switch (fvp->v_type) {
|
|
case VREG:
|
|
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
|
|
goto unionfs_rename_abort;
|
|
error = unionfs_copyfile(unp, 1, fcnp->cn_cred);
|
|
VOP_UNLOCK(fvp);
|
|
if (error != 0)
|
|
goto unionfs_rename_abort;
|
|
break;
|
|
case VDIR:
|
|
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
|
|
goto unionfs_rename_abort;
|
|
error = unionfs_mkshadowdir(ump, rfdvp, unp, fcnp);
|
|
VOP_UNLOCK(fvp);
|
|
if (error != 0)
|
|
goto unionfs_rename_abort;
|
|
break;
|
|
default:
|
|
error = ENODEV;
|
|
goto unionfs_rename_abort;
|
|
}
|
|
|
|
needrelookup = 1;
|
|
}
|
|
|
|
if (unp->un_lowervp != NULLVP)
|
|
fcnp->cn_flags |= DOWHITEOUT;
|
|
rfvp = unp->un_uppervp;
|
|
vref(rfvp);
|
|
|
|
unp = VTOUNIONFS(tdvp);
|
|
#ifdef UNIONFS_IDBG_RENAME
|
|
UNIONFS_INTERNAL_DEBUG("tdvp=%p, utdvp=%p, ltdvp=%p\n", tdvp, unp->un_uppervp, unp->un_lowervp);
|
|
#endif
|
|
if (unp->un_uppervp == NULLVP) {
|
|
error = ENODEV;
|
|
goto unionfs_rename_abort;
|
|
}
|
|
rtdvp = unp->un_uppervp;
|
|
ltdvp = unp->un_lowervp;
|
|
vref(rtdvp);
|
|
|
|
if (tdvp == tvp) {
|
|
rtvp = rtdvp;
|
|
vref(rtvp);
|
|
} else if (tvp != NULLVP) {
|
|
unp = VTOUNIONFS(tvp);
|
|
#ifdef UNIONFS_IDBG_RENAME
|
|
UNIONFS_INTERNAL_DEBUG("tvp=%p, utvp=%p, ltvp=%p\n", tvp, unp->un_uppervp, unp->un_lowervp);
|
|
#endif
|
|
if (unp->un_uppervp == NULLVP)
|
|
rtvp = NULLVP;
|
|
else {
|
|
if (tvp->v_type == VDIR) {
|
|
error = EINVAL;
|
|
goto unionfs_rename_abort;
|
|
}
|
|
rtvp = unp->un_uppervp;
|
|
ltvp = unp->un_lowervp;
|
|
vref(rtvp);
|
|
}
|
|
}
|
|
|
|
if (needrelookup != 0) {
|
|
if ((error = vn_lock(fdvp, LK_EXCLUSIVE)) != 0)
|
|
goto unionfs_rename_abort;
|
|
error = unionfs_relookup_for_delete(fdvp, fcnp);
|
|
VOP_UNLOCK(fdvp);
|
|
if (error != 0)
|
|
goto unionfs_rename_abort;
|
|
|
|
/* Locke of tvp is canceled in order to avoid recursive lock. */
|
|
if (tvp != NULLVP && tvp != tdvp)
|
|
VOP_UNLOCK(tvp);
|
|
error = unionfs_relookup_for_rename(tdvp, tcnp);
|
|
if (tvp != NULLVP && tvp != tdvp)
|
|
vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (error != 0)
|
|
goto unionfs_rename_abort;
|
|
}
|
|
|
|
error = VOP_RENAME(rfdvp, rfvp, fcnp, rtdvp, rtvp, tcnp);
|
|
|
|
if (error == 0) {
|
|
if (rtvp != NULLVP && rtvp->v_type == VDIR)
|
|
cache_purge(tdvp);
|
|
if (fvp->v_type == VDIR && fdvp != tdvp)
|
|
cache_purge(fdvp);
|
|
}
|
|
|
|
if (fdvp != rfdvp)
|
|
vrele(fdvp);
|
|
if (fvp != rfvp)
|
|
vrele(fvp);
|
|
if (ltdvp != NULLVP)
|
|
VOP_UNLOCK(ltdvp);
|
|
if (tdvp != rtdvp)
|
|
vrele(tdvp);
|
|
if (ltvp != NULLVP)
|
|
VOP_UNLOCK(ltvp);
|
|
if (tvp != rtvp && tvp != NULLVP) {
|
|
if (rtvp == NULLVP)
|
|
vput(tvp);
|
|
else
|
|
vrele(tvp);
|
|
}
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
|
|
unionfs_rename_abort:
|
|
if (fdvp != rfdvp)
|
|
vrele(rfdvp);
|
|
if (fvp != rfvp)
|
|
vrele(rfvp);
|
|
if (tdvp != rtdvp)
|
|
vrele(rtdvp);
|
|
vput(tdvp);
|
|
if (tvp != rtvp && rtvp != NULLVP)
|
|
vrele(rtvp);
|
|
if (tvp != NULLVP) {
|
|
if (tdvp != tvp)
|
|
vput(tvp);
|
|
else
|
|
vrele(tvp);
|
|
}
|
|
vrele(fdvp);
|
|
vrele(fvp);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_mkdir(void *v)
|
|
{
|
|
struct vop_mkdir_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *dunp;
|
|
struct componentname *cnp;
|
|
struct vnode *udvp;
|
|
struct vnode *uvp;
|
|
struct vattr va;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_mkdir: enter\n");
|
|
|
|
error = EROFS;
|
|
dunp = VTOUNIONFS(ap->a_dvp);
|
|
cnp = ap->a_cnp;
|
|
udvp = dunp->un_uppervp;
|
|
|
|
if (udvp != NULLVP) {
|
|
/* check opaque */
|
|
if (!(cnp->cn_flags & ISWHITEOUT)) {
|
|
error = VOP_GETATTR(udvp, &va, cnp->cn_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
if (va.va_flags & OPAQUE)
|
|
cnp->cn_flags |= ISWHITEOUT;
|
|
}
|
|
|
|
if ((error = VOP_MKDIR(udvp, &uvp, cnp, ap->a_vap)) == 0) {
|
|
error = unionfs_nodeget(ap->a_dvp->v_mount, uvp, NULLVP,
|
|
ap->a_dvp, ap->a_vpp, cnp);
|
|
if (error) {
|
|
vput(uvp);
|
|
} else {
|
|
vrele(uvp);
|
|
}
|
|
}
|
|
}
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_mkdir: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_rmdir(void *v)
|
|
{
|
|
struct vop_rmdir_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *dunp;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_mount *ump;
|
|
struct componentname *cnp;
|
|
struct vnode *udvp;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: enter\n");
|
|
|
|
error = 0;
|
|
dunp = VTOUNIONFS(ap->a_dvp);
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
cnp = ap->a_cnp;
|
|
udvp = dunp->un_uppervp;
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
|
|
if (udvp == NULLVP)
|
|
return (EROFS);
|
|
|
|
if (udvp == uvp)
|
|
return (EOPNOTSUPP);
|
|
|
|
if (uvp != NULLVP) {
|
|
if (lvp != NULLVP) {
|
|
error = unionfs_check_rmdir(ap->a_vp, cnp->cn_cred);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
|
|
if (ump->um_whitemode == UNIONFS_WHITE_ALWAYS || lvp != NULLVP)
|
|
cnp->cn_flags |= DOWHITEOUT;
|
|
error = VOP_RMDIR(udvp, uvp, cnp);
|
|
}
|
|
else if (lvp != NULLVP)
|
|
error = unionfs_mkwhiteout(udvp, cnp, unp->un_path);
|
|
|
|
if (error == 0) {
|
|
cache_purge(ap->a_dvp);
|
|
cache_purge(ap->a_vp);
|
|
}
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_symlink(void *v)
|
|
{
|
|
struct vop_symlink_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *dunp;
|
|
struct componentname *cnp;
|
|
struct vnode *udvp;
|
|
struct vnode *uvp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: enter\n");
|
|
|
|
error = EROFS;
|
|
dunp = VTOUNIONFS(ap->a_dvp);
|
|
cnp = ap->a_cnp;
|
|
udvp = dunp->un_uppervp;
|
|
|
|
if (udvp != NULLVP) {
|
|
error = VOP_SYMLINK(udvp, &uvp, cnp, ap->a_vap, ap->a_target);
|
|
if (error == 0) {
|
|
error = unionfs_nodeget(ap->a_dvp->v_mount, uvp, NULLVP,
|
|
ap->a_dvp, ap->a_vpp, cnp);
|
|
if (error) {
|
|
vput(uvp);
|
|
} else {
|
|
vrele(uvp);
|
|
}
|
|
}
|
|
}
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_readdir(void *v)
|
|
{
|
|
struct vop_readdir_args *ap = v;
|
|
int error;
|
|
int eofflag;
|
|
int locked;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
struct uio *uio;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct vattr va;
|
|
|
|
int ncookies_bk;
|
|
off_t *cookies_bk;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_readdir: enter\n");
|
|
|
|
error = 0;
|
|
eofflag = 0;
|
|
locked = 0;
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
uio = ap->a_uio;
|
|
uvp = unp->un_uppervp;
|
|
lvp = unp->un_lowervp;
|
|
ncookies_bk = 0;
|
|
cookies_bk = NULL;
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
/* check opaque */
|
|
if (uvp != NULLVP && lvp != NULLVP) {
|
|
if ((error = VOP_GETATTR(uvp, &va, ap->a_cred)) != 0)
|
|
goto unionfs_readdir_exit;
|
|
if (va.va_flags & OPAQUE)
|
|
lvp = NULLVP;
|
|
}
|
|
|
|
/* check the open count. unionfs needs to open before readdir. */
|
|
VOP_UNLOCK(ap->a_vp);
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
|
|
unionfs_get_node_status(unp, &unsp);
|
|
if ((uvp != NULLVP && unsp->uns_upper_opencnt <= 0) ||
|
|
(lvp != NULLVP && unsp->uns_lower_opencnt <= 0)) {
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
error = EBADF;
|
|
}
|
|
if (error != 0)
|
|
goto unionfs_readdir_exit;
|
|
|
|
/* upper only */
|
|
if (uvp != NULLVP && lvp == NULLVP) {
|
|
error = VOP_READDIR(uvp, uio, ap->a_cred, ap->a_eofflag,
|
|
ap->a_cookies, ap->a_ncookies);
|
|
unsp->uns_readdir_status = 0;
|
|
|
|
goto unionfs_readdir_exit;
|
|
}
|
|
|
|
/* lower only */
|
|
if (uvp == NULLVP && lvp != NULLVP) {
|
|
error = VOP_READDIR(lvp, uio, ap->a_cred, ap->a_eofflag,
|
|
ap->a_cookies, ap->a_ncookies);
|
|
unsp->uns_readdir_status = 2;
|
|
|
|
goto unionfs_readdir_exit;
|
|
}
|
|
|
|
/*
|
|
* readdir upper and lower
|
|
*/
|
|
KASSERT(uvp != NULLVP);
|
|
KASSERT(lvp != NULLVP);
|
|
if (uio->uio_offset == 0)
|
|
unsp->uns_readdir_status = 0;
|
|
|
|
if (unsp->uns_readdir_status == 0) {
|
|
/* read upper */
|
|
error = VOP_READDIR(uvp, uio, ap->a_cred, &eofflag,
|
|
ap->a_cookies, ap->a_ncookies);
|
|
|
|
if (error != 0 || eofflag == 0)
|
|
goto unionfs_readdir_exit;
|
|
unsp->uns_readdir_status = 1;
|
|
|
|
/*
|
|
* ufs(and other fs) needs size of uio_resid larger than
|
|
* DIRBLKSIZ.
|
|
* size of DIRBLKSIZ equals DEV_BSIZE.
|
|
* (see: ufs/ufs/ufs_vnops.c ufs_readdir func , ufs/ufs/dir.h)
|
|
*/
|
|
if (uio->uio_resid <= (uio->uio_resid & (DEV_BSIZE -1)))
|
|
goto unionfs_readdir_exit;
|
|
|
|
/*
|
|
* backup cookies
|
|
* It prepares to readdir in lower.
|
|
*/
|
|
if (ap->a_ncookies != NULL) {
|
|
ncookies_bk = *(ap->a_ncookies);
|
|
*(ap->a_ncookies) = 0;
|
|
}
|
|
if (ap->a_cookies != NULL) {
|
|
cookies_bk = *(ap->a_cookies);
|
|
*(ap->a_cookies) = NULL;
|
|
}
|
|
}
|
|
|
|
/* initialize for readdir in lower */
|
|
if (unsp->uns_readdir_status == 1) {
|
|
unsp->uns_readdir_status = 2;
|
|
uio->uio_offset = 0;
|
|
}
|
|
|
|
if (lvp == NULLVP) {
|
|
error = EBADF;
|
|
goto unionfs_readdir_exit;
|
|
}
|
|
/* read lower */
|
|
error = VOP_READDIR(lvp, uio, ap->a_cred, ap->a_eofflag,
|
|
ap->a_cookies, ap->a_ncookies);
|
|
|
|
if (cookies_bk != NULL) {
|
|
/* merge cookies */
|
|
int size;
|
|
off_t *newcookies, *pos;
|
|
|
|
size = *(ap->a_ncookies) + ncookies_bk;
|
|
newcookies = (off_t *) malloc(size * sizeof(off_t),
|
|
M_TEMP, M_WAITOK);
|
|
pos = newcookies;
|
|
|
|
memcpy(pos, cookies_bk, ncookies_bk * sizeof(off_t));
|
|
pos += ncookies_bk * sizeof(off_t);
|
|
memcpy(pos, *(ap->a_cookies), *(ap->a_ncookies) * sizeof(off_t));
|
|
free(cookies_bk, M_TEMP);
|
|
free(*(ap->a_cookies), M_TEMP);
|
|
*(ap->a_ncookies) = size;
|
|
*(ap->a_cookies) = newcookies;
|
|
}
|
|
|
|
unionfs_readdir_exit:
|
|
if (error != 0 && ap->a_eofflag != NULL)
|
|
*(ap->a_eofflag) = 1;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_readdir: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_readlink(void *v)
|
|
{
|
|
struct vop_readlink_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: enter\n");
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
error = VOP_READLINK(vp, ap->a_uio, ap->a_cred);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: leave (%d)\n", error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unionfs_inactive(void *v)
|
|
{
|
|
struct vop_inactive_args *ap = v;
|
|
*ap->a_recycle = true;
|
|
VOP_UNLOCK(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
unionfs_reclaim(void *v)
|
|
{
|
|
struct vop_reclaim_args *ap = v;
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_reclaim: enter\n"); */
|
|
|
|
unionfs_noderem(ap->a_vp);
|
|
|
|
/* UNIONFS_INTERNAL_DEBUG("unionfs_reclaim: leave\n"); */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
unionfs_print(void *v)
|
|
{
|
|
struct vop_print_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
/* struct unionfs_node_status *unsp; */
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
/* unionfs_get_node_status(unp, &unsp); */
|
|
|
|
printf("unionfs_vp=%p, uppervp=%p, lowervp=%p\n",
|
|
ap->a_vp, unp->un_uppervp, unp->un_lowervp);
|
|
/*
|
|
printf("unionfs opencnt: uppervp=%d, lowervp=%d\n",
|
|
unsp->uns_upper_opencnt, unsp->uns_lower_opencnt);
|
|
*/
|
|
|
|
if (unp->un_uppervp != NULLVP)
|
|
vprint("unionfs: upper", unp->un_uppervp);
|
|
if (unp->un_lowervp != NULLVP)
|
|
vprint("unionfs: lower", unp->un_lowervp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
unionfs_lock(void *v)
|
|
{
|
|
struct vop_lock_args *ap = v;
|
|
int error;
|
|
int flags;
|
|
struct vnode *lvp;
|
|
struct vnode *uvp;
|
|
struct unionfs_node *unp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
lvp = unp->un_lowervp;
|
|
uvp = unp->un_uppervp;
|
|
flags = ap->a_flags;
|
|
error = 0;
|
|
|
|
if (lvp != NULLVP) {
|
|
error = VOP_LOCK(lvp, flags);
|
|
}
|
|
if (error == 0 && uvp != NULLVP) {
|
|
error = VOP_LOCK(uvp, flags);
|
|
if (error != 0) {
|
|
VOP_UNLOCK(lvp);
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
unionfs_unlock(void *v)
|
|
{
|
|
struct vop_unlock_args *ap = v;
|
|
int error;
|
|
struct vnode *lvp;
|
|
struct vnode *uvp;
|
|
struct unionfs_node *unp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
lvp = unp->un_lowervp;
|
|
uvp = unp->un_uppervp;
|
|
error = 0;
|
|
|
|
if (lvp != NULLVP) {
|
|
error = VOP_UNLOCK(lvp);
|
|
}
|
|
if (error == 0 && uvp != NULLVP) {
|
|
error = VOP_UNLOCK(uvp);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
unionfs_pathconf(void *v)
|
|
{
|
|
struct vop_pathconf_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return (VOP_PATHCONF(vp, ap->a_name, ap->a_retval));
|
|
}
|
|
|
|
static int
|
|
unionfs_advlock(void *v)
|
|
{
|
|
struct vop_advlock_args *ap = v;
|
|
int error;
|
|
struct unionfs_node *unp;
|
|
struct unionfs_node_status *unsp;
|
|
struct vnode *vp;
|
|
struct vnode *uvp;
|
|
kauth_cred_t cred;
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: enter\n");
|
|
|
|
vp = ap->a_vp;
|
|
cred = kauth_cred_get();
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
uvp = unp->un_uppervp;
|
|
|
|
if (uvp == NULLVP) {
|
|
error = unionfs_copyfile(unp, 1, cred);
|
|
if (error != 0)
|
|
goto unionfs_advlock_abort;
|
|
uvp = unp->un_uppervp;
|
|
|
|
unionfs_get_node_status(unp, &unsp);
|
|
if (unsp->uns_lower_opencnt > 0) {
|
|
/* try reopen the vnode */
|
|
error = VOP_OPEN(uvp, unsp->uns_lower_openmode, cred);
|
|
if (error)
|
|
goto unionfs_advlock_abort;
|
|
unsp->uns_upper_opencnt++;
|
|
VOP_CLOSE(unp->un_lowervp, unsp->uns_lower_openmode, cred);
|
|
unsp->uns_lower_opencnt--;
|
|
} else
|
|
unionfs_tryrem_node_status(unp, unsp);
|
|
}
|
|
|
|
VOP_UNLOCK(vp);
|
|
|
|
error = VOP_ADVLOCK(uvp, ap->a_id, ap->a_op, ap->a_fl, ap->a_flags);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: leave (%d)\n", error);
|
|
|
|
return error;
|
|
|
|
unionfs_advlock_abort:
|
|
VOP_UNLOCK(vp);
|
|
|
|
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: leave (%d)\n", error);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
unionfs_strategy(void *v)
|
|
{
|
|
struct vop_strategy_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vp == NULLVP)
|
|
panic("unionfs_strategy: nullvp");
|
|
if ((ap->a_bp->b_flags & B_READ) == 0 && vp == unp->un_lowervp)
|
|
panic("unionfs_strategy: writing to lowervp");
|
|
#endif
|
|
|
|
return (VOP_STRATEGY(vp, ap->a_bp));
|
|
}
|
|
|
|
static int
|
|
unionfs_kqfilter(void *v)
|
|
{
|
|
struct vop_kqfilter_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_KQFILTER(tvp, ap->a_kn);
|
|
}
|
|
|
|
static int
|
|
unionfs_bmap(void *v)
|
|
{
|
|
struct vop_bmap_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_BMAP(tvp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp);
|
|
}
|
|
|
|
static int
|
|
unionfs_mmap(void *v)
|
|
{
|
|
struct vop_mmap_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_MMAP(tvp, ap->a_prot, ap->a_cred);
|
|
}
|
|
|
|
static int
|
|
unionfs_abortop(void *v)
|
|
{
|
|
struct vop_abortop_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_dvp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_ABORTOP(tvp, ap->a_cnp);
|
|
}
|
|
|
|
static int
|
|
unionfs_islocked(void *v)
|
|
{
|
|
struct vop_islocked_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_ISLOCKED(tvp);
|
|
}
|
|
|
|
static int
|
|
unionfs_seek(void *v)
|
|
{
|
|
struct vop_seek_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
return VOP_SEEK(tvp, ap->a_oldoff, ap->a_newoff, ap->a_cred);
|
|
}
|
|
|
|
static int
|
|
unionfs_putpages(void *v)
|
|
{
|
|
struct vop_putpages_args /* {
|
|
struct vnode *a_vp;
|
|
voff_t a_offlo;
|
|
voff_t a_offhi;
|
|
int a_flags;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp, *tvp;
|
|
struct unionfs_node *unp;
|
|
|
|
KASSERT(mutex_owned(vp->v_interlock));
|
|
|
|
unp = VTOUNIONFS(vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
KASSERT(tvp->v_interlock == vp->v_interlock);
|
|
|
|
if (ap->a_flags & PGO_RECLAIM) {
|
|
mutex_exit(vp->v_interlock);
|
|
return 0;
|
|
}
|
|
return VOP_PUTPAGES(tvp, ap->a_offlo, ap->a_offhi, ap->a_flags);
|
|
}
|
|
|
|
static int
|
|
unionfs_getpages(void *v)
|
|
{
|
|
struct vop_getpages_args /* {
|
|
struct vnode *a_vp;
|
|
voff_t a_offset;
|
|
struct vm_page **a_m;
|
|
int *a_count;
|
|
int a_centeridx;
|
|
vm_prot_t a_access_type;
|
|
int a_advice;
|
|
int a_flags;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp, *tvp;
|
|
struct unionfs_node *unp;
|
|
|
|
KASSERT(mutex_owned(vp->v_interlock));
|
|
|
|
unp = VTOUNIONFS(vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
KASSERT(tvp->v_interlock == vp->v_interlock);
|
|
|
|
if (ap->a_flags & PGO_LOCKED) {
|
|
return EBUSY;
|
|
}
|
|
return VOP_GETPAGES(tvp, ap->a_offset, ap->a_m, ap->a_count,
|
|
ap->a_centeridx, ap->a_access_type, ap->a_advice, ap->a_flags);
|
|
}
|
|
|
|
static int
|
|
unionfs_revoke(void *v)
|
|
{
|
|
struct vop_revoke_args *ap = v;
|
|
struct unionfs_node *unp;
|
|
struct vnode *tvp;
|
|
int error;
|
|
|
|
unp = VTOUNIONFS(ap->a_vp);
|
|
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
|
|
|
|
error = VOP_REVOKE(tvp, ap->a_flags);
|
|
if (error == 0) {
|
|
vgone(ap->a_vp); /* ??? */
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Global vfs data structures
|
|
*/
|
|
int (**unionfs_vnodeop_p)(void *);
|
|
const struct vnodeopv_entry_desc unionfs_vnodeop_entries[] = {
|
|
{ &vop_default_desc, vn_default_error },
|
|
{ &vop_lookup_desc, unionfs_lookup }, /* lookup */
|
|
{ &vop_create_desc, unionfs_create }, /* create */
|
|
{ &vop_whiteout_desc, unionfs_whiteout }, /* whiteout */
|
|
{ &vop_mknod_desc, unionfs_mknod }, /* mknod */
|
|
{ &vop_open_desc, unionfs_open }, /* open */
|
|
{ &vop_close_desc, unionfs_close }, /* close */
|
|
{ &vop_access_desc, unionfs_access }, /* access */
|
|
{ &vop_getattr_desc, unionfs_getattr }, /* getattr */
|
|
{ &vop_setattr_desc, unionfs_setattr }, /* setattr */
|
|
{ &vop_read_desc, unionfs_read }, /* read */
|
|
{ &vop_write_desc, unionfs_write }, /* write */
|
|
{ &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */
|
|
{ &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */
|
|
{ &vop_ioctl_desc, unionfs_ioctl }, /* ioctl */
|
|
{ &vop_poll_desc, unionfs_poll }, /* select */
|
|
{ &vop_revoke_desc, unionfs_revoke }, /* revoke */
|
|
{ &vop_mmap_desc, unionfs_mmap }, /* mmap */
|
|
{ &vop_fsync_desc, unionfs_fsync }, /* fsync */
|
|
{ &vop_seek_desc, unionfs_seek }, /* seek */
|
|
{ &vop_remove_desc, unionfs_remove }, /* remove */
|
|
{ &vop_link_desc, unionfs_link }, /* link */
|
|
{ &vop_rename_desc, unionfs_rename }, /* rename */
|
|
{ &vop_mkdir_desc, unionfs_mkdir }, /* mkdir */
|
|
{ &vop_rmdir_desc, unionfs_rmdir }, /* rmdir */
|
|
{ &vop_symlink_desc, unionfs_symlink }, /* symlink */
|
|
{ &vop_readdir_desc, unionfs_readdir }, /* readdir */
|
|
{ &vop_readlink_desc, unionfs_readlink }, /* readlink */
|
|
{ &vop_abortop_desc, unionfs_abortop }, /* abortop */
|
|
{ &vop_inactive_desc, unionfs_inactive }, /* inactive */
|
|
{ &vop_reclaim_desc, unionfs_reclaim }, /* reclaim */
|
|
{ &vop_lock_desc, unionfs_lock }, /* lock */
|
|
{ &vop_unlock_desc, unionfs_unlock }, /* unlock */
|
|
{ &vop_bmap_desc, unionfs_bmap }, /* bmap */
|
|
{ &vop_strategy_desc, unionfs_strategy }, /* strategy */
|
|
{ &vop_print_desc, unionfs_print }, /* print */
|
|
{ &vop_islocked_desc, unionfs_islocked }, /* islocked */
|
|
{ &vop_pathconf_desc, unionfs_pathconf }, /* pathconf */
|
|
{ &vop_advlock_desc, unionfs_advlock }, /* advlock */
|
|
{ &vop_getpages_desc, unionfs_getpages }, /* getpages */
|
|
{ &vop_putpages_desc, unionfs_putpages }, /* putpages */
|
|
{ &vop_kqfilter_desc, unionfs_kqfilter }, /* kqfilter */
|
|
#ifdef notdef
|
|
{ &vop_bwrite_desc, unionfs_bwrite }, /* bwrite */
|
|
#endif
|
|
{ NULL, NULL }
|
|
};
|
|
const struct vnodeopv_desc unionfs_vnodeop_opv_desc =
|
|
{ &unionfs_vnodeop_p, unionfs_vnodeop_entries };
|