589 lines
13 KiB
C
589 lines
13 KiB
C
/*-
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* Copyright (c) 1994, 1995 The Regents of the University of California.
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* Copyright (c) 1994, 1995 Jan-Simon Pendry.
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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 donated 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_vfsops.c 8.20 (Berkeley) 5/20/95
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* $FreeBSD: src/sys/fs/unionfs/union_vfsops.c,v 1.89 2008/01/13 14:44:06 attilio Exp $
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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/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/namei.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/module.h>
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#include <fs/unionfs/unionfs.h>
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MODULE(MODULE_CLASS_VFS, unionfs, "layerfs");
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MALLOC_DEFINE(M_UNIONFSMNT, "UNIONFS mount", "UNIONFS mount structure");
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struct vfsops unionfs_vfsops;
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VFS_PROTOS(unionfs);
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static struct sysctllog *unionfs_sysctl_log;
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/*
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* Mount unionfs layer.
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*/
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int
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unionfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
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{
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int error;
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struct vnode *lowerrootvp;
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struct vnode *upperrootvp;
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struct unionfs_mount *ump;
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int below;
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uid_t uid;
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gid_t gid;
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u_short udir;
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u_short ufile;
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unionfs_copymode copymode;
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unionfs_whitemode whitemode;
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struct pathbuf *pb;
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struct componentname fakecn;
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struct nameidata nd, *ndp;
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struct vattr va;
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struct union_args *args = data;
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kauth_cred_t cred;
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size_t size;
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size_t len;
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const char *cp;
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char *xp;
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if (*data_len < sizeof *args)
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return EINVAL;
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UNIONFSDEBUG("unionfs_mount(mp = %p)\n", (void *)mp);
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error = 0;
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below = 0;
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uid = 0;
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gid = 0;
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udir = 0;
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ufile = 0;
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copymode = UNIONFS_TRANSPARENT; /* default */
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whitemode = UNIONFS_WHITE_ALWAYS;
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ndp = &nd;
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cred = kauth_cred_get();
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if (mp->mnt_flag & MNT_ROOTFS) {
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printf("union_mount: cannot union mount root filesystem\n");
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return (EOPNOTSUPP);
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}
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if (mp->mnt_flag & MNT_GETARGS) {
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ump = MOUNTTOUNIONFSMOUNT(mp);
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if (ump == NULL)
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return EIO;
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args->target = NULL;
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args->mntflags = ump->um_op;
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*data_len = sizeof *args;
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return 0;
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}
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/*
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* Update is a no operation.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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printf("union_mount: cannot update union mount\n");
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return (EOPNOTSUPP);
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}
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vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_GETATTR(mp->mnt_vnodecovered, &va, cred);
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if (!error) {
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if (udir == 0)
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udir = va.va_mode;
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if (ufile == 0)
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ufile = va.va_mode;
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uid = va.va_uid;
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gid = va.va_gid;
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}
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VOP_UNLOCK(mp->mnt_vnodecovered);
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if (error)
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return (error);
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switch (args->mntflags & UNMNT_OPMASK) {
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case UNMNT_ABOVE:
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below = 0;
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break;
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case UNMNT_BELOW:
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below = 1;
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break;
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case UNMNT_REPLACE:
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default:
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return EINVAL;
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}
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/* If copymode is UNIONFS_TRADITIONAL, uid/gid is mounted user. */
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if (copymode == UNIONFS_TRADITIONAL) {
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uid = kauth_cred_getuid(cred);
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gid = kauth_cred_getgid(cred);
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}
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UNIONFSDEBUG("unionfs_mount: uid=%d, gid=%d\n", uid, gid);
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UNIONFSDEBUG("unionfs_mount: udir=0%03o, ufile=0%03o\n", udir, ufile);
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UNIONFSDEBUG("unionfs_mount: copymode=%d\n", copymode);
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/*
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* Find upper node
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*/
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error = pathbuf_copyin(args->target, &pb);
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if (error) {
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return error;
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}
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NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, pb);
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if ((error = namei(ndp))) {
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pathbuf_destroy(pb);
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return error;
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}
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/* get root vnodes */
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lowerrootvp = mp->mnt_vnodecovered;
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upperrootvp = ndp->ni_vp;
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vrele(ndp->ni_dvp);
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ndp->ni_dvp = NULLVP;
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pathbuf_destroy(pb);
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/* create unionfs_mount */
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ump = (struct unionfs_mount *)malloc(sizeof(struct unionfs_mount),
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M_UNIONFSMNT, M_WAITOK | M_ZERO);
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/*
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* Save reference
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*/
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if (below) {
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VOP_UNLOCK(upperrootvp);
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vn_lock(lowerrootvp, LK_EXCLUSIVE | LK_RETRY);
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ump->um_lowervp = upperrootvp;
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ump->um_uppervp = lowerrootvp;
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} else {
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ump->um_lowervp = lowerrootvp;
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ump->um_uppervp = upperrootvp;
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}
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ump->um_rootvp = NULLVP;
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ump->um_uid = uid;
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ump->um_gid = gid;
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ump->um_udir = udir;
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ump->um_ufile = ufile;
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ump->um_copymode = copymode;
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ump->um_whitemode = whitemode;
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if ((lowerrootvp->v_mount->mnt_iflag & IMNT_MPSAFE) &&
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(upperrootvp->v_mount->mnt_flag & IMNT_MPSAFE))
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mp->mnt_iflag |= IMNT_MPSAFE;
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mp->mnt_data = ump;
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/*
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* Copy upper layer's RDONLY flag.
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*/
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mp->mnt_flag |= ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY;
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/*
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* Check whiteout
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*/
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if ((mp->mnt_flag & MNT_RDONLY) == 0) {
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memset(&fakecn, 0, sizeof(fakecn));
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fakecn.cn_nameiop = LOOKUP;
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error = VOP_WHITEOUT(ump->um_uppervp, &fakecn, LOOKUP);
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if (error) {
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if (below) {
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VOP_UNLOCK(ump->um_uppervp);
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vrele(upperrootvp);
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} else
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vput(ump->um_uppervp);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (error);
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}
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}
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/*
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* Unlock the node
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*/
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VOP_UNLOCK(ump->um_uppervp);
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ump->um_op = args->mntflags & UNMNT_OPMASK;
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/*
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* Get the unionfs root vnode.
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*/
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error = unionfs_nodeget(mp, ump->um_uppervp, ump->um_lowervp,
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NULLVP, &(ump->um_rootvp), NULL);
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vrele(upperrootvp);
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if (error) {
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (error);
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}
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/*
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* Check mnt_flag
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*/
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if ((ump->um_lowervp->v_mount->mnt_flag & MNT_LOCAL) &&
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(ump->um_uppervp->v_mount->mnt_flag & MNT_LOCAL))
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mp->mnt_flag |= MNT_LOCAL;
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/*
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* Get new fsid
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*/
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vfs_getnewfsid(mp);
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error = set_statvfs_info(path, UIO_USERSPACE, NULL, UIO_USERSPACE,
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mp->mnt_op->vfs_name, mp, curlwp);
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if (error) {
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unionfs_noderem(ump->um_rootvp);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (error);
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}
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switch (ump->um_op) {
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case UNMNT_ABOVE:
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cp = "<above>:";
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break;
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case UNMNT_BELOW:
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cp = "<below>:";
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break;
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default:
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panic("union_mount: bad um_op");
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break;
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}
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len = strlen(cp);
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memcpy(mp->mnt_stat.f_mntfromname, cp, len);
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xp = mp->mnt_stat.f_mntfromname + len;
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len = MNAMELEN - len;
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(void) copyinstr(args->target, xp, len - 1, &size);
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memset(xp + size, 0, len - size);
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UNIONFSDEBUG("unionfs_mount: from %s, on %s\n",
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mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
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return (0);
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}
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/*
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* Free reference to unionfs layer
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*/
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int
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unionfs_unmount(struct mount *mp, int mntflags)
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{
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struct unionfs_mount *ump;
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int error;
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int freeing;
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int flags;
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UNIONFSDEBUG("unionfs_unmount: mp = %p\n", (void *)mp);
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ump = MOUNTTOUNIONFSMOUNT(mp);
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flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/* vflush (no need to call vrele) */
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for (freeing = 0; (error = vflush(mp, NULL, flags)) != 0;) {
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struct vnode *vp;
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int n;
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/* count #vnodes held on mount list */
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n = 0;
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TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
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n++;
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/* if this is unchanged then stop */
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if (n == freeing)
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break;
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/* otherwise try once more time */
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freeing = n;
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}
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if (error)
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return (error);
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free(ump, M_UNIONFSMNT);
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mp->mnt_data = NULL;
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return (0);
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}
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int
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unionfs_root(struct mount *mp, struct vnode **vpp)
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{
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struct unionfs_mount *ump;
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struct vnode *vp;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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vp = ump->um_rootvp;
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UNIONFSDEBUG("unionfs_root: rootvp=%p locked=%x\n",
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vp, VOP_ISLOCKED(vp));
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vref(vp);
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vn_lock(vp, LK_EXCLUSIVE);
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*vpp = vp;
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return (0);
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}
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int
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unionfs_quotactl(struct mount *mp, prop_dictionary_t dict)
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{
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struct unionfs_mount *ump;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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/*
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* Writing is always performed to upper vnode.
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*/
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return (VFS_QUOTACTL(ump->um_uppervp->v_mount, dict));
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}
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int
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unionfs_statvfs(struct mount *mp, struct statvfs *sbp)
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{
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struct unionfs_mount *ump;
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int error;
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uint64_t lbsize;
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struct statvfs *sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK | M_ZERO);
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ump = MOUNTTOUNIONFSMOUNT(mp);
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UNIONFSDEBUG("unionfs_statvfs(mp = %p, lvp = %p, uvp = %p)\n",
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(void *)mp, (void *)ump->um_lowervp, (void *)ump->um_uppervp);
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error = VFS_STATVFS(ump->um_lowervp->v_mount, sbuf);
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if (error)
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goto done;
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/* now copy across the "interesting" information and fake the rest */
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sbp->f_blocks = sbuf->f_blocks;
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sbp->f_files = sbuf->f_files;
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lbsize = sbuf->f_bsize;
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error = VFS_STATVFS(ump->um_uppervp->v_mount, sbuf);
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if (error)
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goto done;
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/*
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* The FS type etc is copy from upper vfs.
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* (write able vfs have priority)
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*/
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sbp->f_flag = sbuf->f_flag;
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sbp->f_bsize = sbuf->f_bsize;
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sbp->f_iosize = sbuf->f_iosize;
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if (sbuf->f_bsize != lbsize)
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sbp->f_blocks = ((off_t)sbp->f_blocks * lbsize) / sbuf->f_bsize;
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sbp->f_blocks += sbuf->f_blocks;
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sbp->f_bfree = sbuf->f_bfree;
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sbp->f_bavail = sbuf->f_bavail;
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sbp->f_files += sbuf->f_files;
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sbp->f_ffree = sbuf->f_ffree;
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done:
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free(sbuf, M_TEMP);
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return (error);
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}
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int
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unionfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
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{
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/* nothing to do */
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return (0);
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}
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int
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unionfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
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{
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return (EOPNOTSUPP);
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}
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int
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unionfs_fhtovp(struct mount *mp, struct fid *fidp, struct vnode **vpp)
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{
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return (EOPNOTSUPP);
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}
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int
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unionfs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
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int namespace, const char *attrname)
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{
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struct unionfs_mount *ump;
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struct unionfs_node *unp;
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ump = MOUNTTOUNIONFSMOUNT(mp);
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unp = VTOUNIONFS(filename_vp);
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if (unp->un_uppervp != NULLVP) {
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return (VFS_EXTATTRCTL(ump->um_uppervp->v_mount, cmd,
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unp->un_uppervp, namespace, attrname));
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} else {
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return (VFS_EXTATTRCTL(ump->um_lowervp->v_mount, cmd,
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unp->un_lowervp, namespace, attrname));
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}
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}
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/*
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* Initialize
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*/
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void
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unionfs_init(void)
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{
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UNIONFSDEBUG("unionfs_init\n"); /* printed during system boot */
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}
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static int
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unionfs_renamelock_enter(struct mount *mp)
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{
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struct unionfs_mount *um = MOUNTTOUNIONFSMOUNT(mp);
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/* Lock just the upper fs, where the action happens. */
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return VFS_RENAMELOCK_ENTER(um->um_uppervp->v_mount);
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}
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static void
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unionfs_renamelock_exit(struct mount *mp)
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{
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struct unionfs_mount *um = MOUNTTOUNIONFSMOUNT(mp);
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VFS_RENAMELOCK_EXIT(um->um_uppervp->v_mount);
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}
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int
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unionfs_start(struct mount *mp, int flags)
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{
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return (0);
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}
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void
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unionfs_done(void)
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{
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/* Make sure to unset the readdir hook. */
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vn_union_readdir_hook = NULL;
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}
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extern const struct vnodeopv_desc unionfs_vnodeop_opv_desc;
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const struct vnodeopv_desc * const unionfs_vnodeopv_descs[] = {
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&unionfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops unionfs_vfsops = {
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MOUNT_UNION,
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sizeof (struct unionfs_args),
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unionfs_mount,
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unionfs_start,
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unionfs_unmount,
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unionfs_root,
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(void *)eopnotsupp, /* vfs_quotactl */
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unionfs_statvfs,
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unionfs_sync,
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unionfs_vget,
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(void *)eopnotsupp, /* vfs_fhtovp */
|
|
(void *)eopnotsupp, /* vfs_vptofh */
|
|
unionfs_init,
|
|
NULL, /* vfs_reinit */
|
|
unionfs_done,
|
|
NULL, /* vfs_mountroot */
|
|
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
|
|
vfs_stdextattrctl,
|
|
(void *)eopnotsupp, /* vfs_suspendctl */
|
|
unionfs_renamelock_enter,
|
|
unionfs_renamelock_exit,
|
|
(void *)eopnotsupp,
|
|
unionfs_vnodeopv_descs,
|
|
0, /* vfs_refcount */
|
|
{ NULL, NULL },
|
|
};
|
|
|
|
static int
|
|
unionfs_modcmd(modcmd_t cmd, void *arg)
|
|
{
|
|
int error;
|
|
|
|
switch (cmd) {
|
|
case MODULE_CMD_INIT:
|
|
error = vfs_attach(&unionfs_vfsops);
|
|
if (error != 0)
|
|
break;
|
|
sysctl_createv(&unionfs_sysctl_log, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "vfs", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_VFS, CTL_EOL);
|
|
sysctl_createv(&unionfs_sysctl_log, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "union",
|
|
SYSCTL_DESCR("Union file system"),
|
|
NULL, 0, NULL, 0,
|
|
CTL_VFS, 15, CTL_EOL);
|
|
/*
|
|
* XXX the "15" above could be dynamic, thereby eliminating
|
|
* one more instance of the "number to vfs" mapping problem,
|
|
* but "15" is the order as taken from sys/mount.h
|
|
*/
|
|
break;
|
|
case MODULE_CMD_FINI:
|
|
error = vfs_detach(&unionfs_vfsops);
|
|
if (error != 0)
|
|
break;
|
|
sysctl_teardown(&unionfs_sysctl_log);
|
|
break;
|
|
default:
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|