384 lines
8.6 KiB
C
384 lines
8.6 KiB
C
/*
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* Copyright (c) 1992 The Regents of the University of California
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* Copyright (c) 1990, 1992 Jan-Simon Pendry
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From:
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* Id: lofs_vfsops.c,v 4.1 1993/12/17 10:47:45 jsp Rel
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*
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* $Id: lofs_vfsops.c,v 1.2 1994/01/05 15:11:51 cgd Exp $
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*/
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/*
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* Loopback Filesystem
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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/time.h>
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#include <sys/types.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <miscfs/lofs/lofs.h>
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#if 0
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/*
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* Allocate a new unique fsid
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*/
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getnewfsid(mp, mtype)
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struct mount *mp;
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int mtype;
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{
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static u_short xxxfs_mntid;
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fsid_t tfsid;
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mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */
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mp->mnt_stat.f_fsid.val[1] = MOUNT_LOFS;
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if (xxxfs_mntid == 0)
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++xxxfs_mntid;
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tfsid.val[0] = makedev(nblkdev, xxxfs_mntid);
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tfsid.val[1] = mtype;
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while (getvfs(&tfsid)) {
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#ifdef DIAGNOSTIC
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printf("mntid %d in use\n", xxxfs_mntid);
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#endif
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tfsid.val[0]++;
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xxxfs_mntid++;
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}
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mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
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}
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#endif
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/*
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* Mount loopback copy of existing name space
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*/
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lofs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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int error = 0;
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struct lofs_args args;
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struct vnode *vp;
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struct vnode *rootvp;
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struct lofsmount *amp;
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u_int size;
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#ifdef LOFS_DIAGNOSTIC
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printf("lofs_mount(mp = %x)\n", mp);
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#endif
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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return (EOPNOTSUPP);
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/* return VFS_MOUNT(VFSTOLOFS(mp)->looped_vfs, path, data, ndp, p);*/
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}
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/*
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* Get argument
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*/
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if (error = copyin(data, (caddr_t)&args, sizeof(struct lofs_args)))
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return (error);
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/*
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* Find target node
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*/
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ndp->ni_nameiop = LOOKUP | FOLLOW | WANTPARENT | LOCKLEAF;
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ndp->ni_segflg = UIO_USERSPACE;
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ndp->ni_dirp = args.target;
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if (error = namei(ndp, p))
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return (error);
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/*
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* Sanity check on target vnode
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*/
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vp = ndp->ni_vp;
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#ifdef LOFS_DIAGNOSTIC
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printf("vp = %x, check for VDIR...\n", vp);
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#endif
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vrele(ndp->ni_dvp);
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ndp->ni_dvp = 0;
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if (vp->v_type != VDIR) {
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vput(vp);
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return (EINVAL);
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}
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#ifdef LOFS_DIAGNOSTIC
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printf("mp = %x\n", mp);
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#endif
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amp = (struct lofsmount *) malloc(sizeof(struct lofsmount),
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M_UFSMNT, M_WAITOK); /* XXX */
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/*
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* Save reference to underlying target FS
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*/
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amp->looped_vfs = vp->v_mount;
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/*
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* Save reference. Each mount also holds
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* a reference on the root vnode.
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*/
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error = make_lofs(mp, ndp);
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/*
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* Unlock the node (either the target or the alias)
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*/
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VOP_UNLOCK(ndp->ni_vp);
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/*
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* Make sure the node alias worked
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*/
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if (error) {
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vrele(ndp->ni_vp);
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free(amp, M_UFSMNT); /* XXX */
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return (error);
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}
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/*
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* Keep a held reference to the root vnode.
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* It is vrele'd in lofs_unmount.
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*/
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rootvp = ndp->ni_vp;
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rootvp->v_flag |= VROOT;
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amp->rootvp = rootvp;
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if (LOFSVP(rootvp)->v_mount->mnt_flag & MNT_LOCAL)
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) amp;
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getnewfsid(mp, MOUNT_LOFS);
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(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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#ifdef LOFS_DIAGNOSTIC
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printf("lofs_mount: target %s, alias at %s\n",
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mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
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#endif
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return (0);
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}
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/*
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* VFS start. Nothing needed here - the start routine
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* on the underlying filesystem will have been called
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* when that filesystem was mounted.
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*/
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lofs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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/* return VFS_START(VFSTOLOFS(mp)->looped_vfs, flags, p); */
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}
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/*
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* Free reference to looped FS
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*/
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lofs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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struct vnode *rootvp = VFSTOLOFS(mp)->rootvp;
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int error;
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int flags = 0;
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extern int doforce;
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#ifdef LOFS_DIAGNOSTIC
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printf("lofs_unmount(mp = %x)\n", mp);
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#endif
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if (mntflags & MNT_FORCE) {
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/* lofs can never be rootfs so don't check for it */
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if (!doforce)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*/
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
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return (EBUSY);
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if (rootvp->v_usecount > 1)
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return (EBUSY);
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if (error = vflush(mp, rootvp, flags))
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return (error);
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#ifdef LOFS_DIAGNOSTIC
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/*
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* Flush any remaining vnode references
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*/
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lofs_flushmp(mp);
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#endif
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#ifdef LOFS_DIAGNOSTIC
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vprint("alias root of target", rootvp);
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#endif
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/*
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* Release reference on underlying root vnode
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*/
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vrele(rootvp);
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/*
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* And blow it away for future re-use
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*/
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vgone(rootvp);
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/*
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* Finally, throw away the lofsmount structure
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*/
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free(mp->mnt_data, M_UFSMNT); /* XXX */
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mp->mnt_data = 0;
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return 0;
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}
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lofs_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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struct vnode *vp;
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#ifdef LOFS_DIAGNOSTIC
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printf("lofs_root(mp = %x, vp = %x->%x)\n", mp,
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VFSTOLOFS(mp)->rootvp,
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LOFSVP(VFSTOLOFS(mp)->rootvp)
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);
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOLOFS(mp)->rootvp;
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VREF(vp);
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VOP_LOCK(vp);
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*vpp = vp;
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return 0;
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}
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lofs_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return VFS_QUOTACTL(VFSTOLOFS(mp)->looped_vfs, cmd, uid, arg, p);
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}
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lofs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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int error;
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struct statfs mstat;
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#ifdef LOFS_DIAGNOSTIC
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printf("lofs_statfs(mp = %x, vp = %x->%x)\n", mp,
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VFSTOLOFS(mp)->rootvp,
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LOFSVP(VFSTOLOFS(mp)->rootvp)
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);
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#endif
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bzero(&mstat, sizeof(mstat));
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error = VFS_STATFS(VFSTOLOFS(mp)->looped_vfs, &mstat, p);
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if (error)
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return (error);
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/* now copy across the "interesting" information and fake the rest */
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sbp->f_type = mstat.f_type;
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sbp->f_flags = mstat.f_flags;
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sbp->f_fsize = mstat.f_fsize;
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sbp->f_bsize = mstat.f_bsize;
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sbp->f_blocks = mstat.f_blocks;
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sbp->f_bfree = mstat.f_bfree;
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sbp->f_bavail = mstat.f_bavail;
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sbp->f_files = mstat.f_files;
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sbp->f_ffree = mstat.f_ffree;
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if (sbp != &mp->mnt_stat) {
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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lofs_sync(mp, waitfor)
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struct mount *mp;
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int waitfor;
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{
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return (0);
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}
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lofs_fhtovp(mp, fhp, vpp)
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struct mount *mp;
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struct fid *fhp;
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struct vnode **vpp;
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{
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return VFS_FHTOVP(VFSTOLOFS(mp)->looped_vfs, fhp, vpp);
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}
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lofs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return VFS_VPTOFH(LOFSVP(vp), fhp);
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}
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int lofs_init __P((void));
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struct vfsops lofs_vfsops = {
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lofs_mount,
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lofs_start,
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lofs_unmount,
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lofs_root,
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lofs_quotactl,
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lofs_statfs,
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lofs_sync,
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lofs_fhtovp,
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lofs_vptofh,
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lofs_init,
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};
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