588 lines
15 KiB
C
588 lines
15 KiB
C
/* $NetBSD: union_vfsops.c,v 1.35 2006/05/14 21:31:52 elad Exp $ */
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/*
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* Copyright (c) 1994 The Regents of the University of California.
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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. 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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*/
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/*
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* Copyright (c) 1994 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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* @(#)union_vfsops.c 8.20 (Berkeley) 5/20/95
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*/
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/*
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* Union Layer
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: union_vfsops.c,v 1.35 2006/05/14 21:31:52 elad Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/proc.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 <sys/filedesc.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <sys/kauth.h>
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#include <fs/union/union.h>
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int union_mount(struct mount *, const char *, void *, struct nameidata *,
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struct lwp *);
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int union_start(struct mount *, int, struct lwp *);
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int union_unmount(struct mount *, int, struct lwp *);
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int union_root(struct mount *, struct vnode **);
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int union_quotactl(struct mount *, int, uid_t, void *, struct lwp *);
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int union_statvfs(struct mount *, struct statvfs *, struct lwp *);
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int union_sync(struct mount *, int, kauth_cred_t, struct lwp *);
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int union_vget(struct mount *, ino_t, struct vnode **);
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/*
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* Mount union filesystem
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*/
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int
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union_mount(mp, path, data, ndp, l)
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struct mount *mp;
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const char *path;
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void *data;
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struct nameidata *ndp;
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struct lwp *l;
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{
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int error = 0;
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struct union_args args;
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struct vnode *lowerrootvp = NULLVP;
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struct vnode *upperrootvp = NULLVP;
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struct union_mount *um = 0;
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const char *cp;
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char *xp;
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int len;
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size_t size;
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#ifdef UNION_DIAGNOSTIC
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printf("union_mount(mp = %p)\n", mp);
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#endif
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if (mp->mnt_flag & MNT_GETARGS) {
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um = MOUNTTOUNIONMOUNT(mp);
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if (um == NULL)
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return EIO;
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args.target = NULL;
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args.mntflags = um->um_op;
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return copyout(&args, data, sizeof(args));
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}
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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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/*
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* Need to provide.
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* 1. a way to convert between rdonly and rdwr mounts.
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* 2. support for nfs exports.
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*/
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error = EOPNOTSUPP;
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goto bad;
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}
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/*
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* Get argument
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*/
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error = copyin(data, &args, sizeof(struct union_args));
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if (error)
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goto bad;
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lowerrootvp = mp->mnt_vnodecovered;
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VREF(lowerrootvp);
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/*
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* Find upper node.
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*/
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NDINIT(ndp, LOOKUP, FOLLOW,
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UIO_USERSPACE, args.target, l);
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if ((error = namei(ndp)) != 0)
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goto bad;
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upperrootvp = ndp->ni_vp;
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if (upperrootvp->v_type != VDIR) {
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error = EINVAL;
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goto bad;
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}
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um = (struct union_mount *) malloc(sizeof(struct union_mount),
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M_UFSMNT, M_WAITOK); /* XXX */
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/*
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* Keep a held reference to the target vnodes.
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* They are vrele'd in union_unmount.
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*
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* Depending on the _BELOW flag, the filesystems are
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* viewed in a different order. In effect, this is the
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* same as providing a mount under option to the mount syscall.
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*/
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um->um_op = args.mntflags & UNMNT_OPMASK;
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switch (um->um_op) {
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case UNMNT_ABOVE:
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um->um_lowervp = lowerrootvp;
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um->um_uppervp = upperrootvp;
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break;
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case UNMNT_BELOW:
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um->um_lowervp = upperrootvp;
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um->um_uppervp = lowerrootvp;
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break;
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case UNMNT_REPLACE:
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vrele(lowerrootvp);
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lowerrootvp = NULLVP;
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um->um_uppervp = upperrootvp;
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um->um_lowervp = lowerrootvp;
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break;
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default:
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error = EINVAL;
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goto bad;
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}
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/*
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* Unless the mount is readonly, ensure that the top layer
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* supports whiteout operations
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*/
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if ((mp->mnt_flag & MNT_RDONLY) == 0) {
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error = VOP_WHITEOUT(um->um_uppervp, (struct componentname *) 0, LOOKUP);
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if (error)
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goto bad;
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}
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um->um_cred = l->l_proc->p_cred;
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kauth_cred_hold(um->um_cred);
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um->um_cmode = UN_DIRMODE &~ l->l_proc->p_cwdi->cwdi_cmask;
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/*
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* Depending on what you think the MNT_LOCAL flag might mean,
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* you may want the && to be || on the conditional below.
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* At the moment it has been defined that the filesystem is
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* only local if it is all local, ie the MNT_LOCAL flag implies
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* that the entire namespace is local. If you think the MNT_LOCAL
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* flag implies that some of the files might be stored locally
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* then you will want to change the conditional.
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*/
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if (um->um_op == UNMNT_ABOVE) {
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if (((um->um_lowervp == NULLVP) ||
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(um->um_lowervp->v_mount->mnt_flag & MNT_LOCAL)) &&
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(um->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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/*
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* Copy in the upper layer's RDONLY flag. This is for the benefit
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* of lookup() which explicitly checks the flag, rather than asking
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* the filesystem for it's own opinion. This means, that an update
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* mount of the underlying filesystem to go from rdonly to rdwr
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* will leave the unioned view as read-only.
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*/
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mp->mnt_flag |= (um->um_uppervp->v_mount->mnt_flag & MNT_RDONLY);
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mp->mnt_data = um;
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mp->mnt_leaf = um->um_uppervp->v_mount->mnt_leaf;
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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, l);
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if (error)
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goto bad;
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switch (um->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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case UNMNT_REPLACE:
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cp = "";
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break;
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default:
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cp = "<invalid>:";
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#ifdef DIAGNOSTIC
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panic("union_mount: bad um_op");
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#endif
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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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#ifdef UNION_DIAGNOSTIC
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printf("union_mount: from %s, on %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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/* Setup the readdir hook if it's not set already */
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if (!vn_union_readdir_hook)
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vn_union_readdir_hook = union_readdirhook;
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return (0);
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bad:
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if (um)
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free(um, M_UFSMNT);
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if (upperrootvp)
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vrele(upperrootvp);
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if (lowerrootvp)
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vrele(lowerrootvp);
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return (error);
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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(s) will have been called
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* when that filesystem was mounted.
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*/
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/*ARGSUSED*/
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int
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union_start(mp, flags, l)
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struct mount *mp;
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int flags;
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struct lwp *l;
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{
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return (0);
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}
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/*
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* Free reference to union layer
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*/
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int
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union_unmount(mp, mntflags, l)
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struct mount *mp;
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int mntflags;
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struct lwp *l;
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{
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struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
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int freeing;
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int error;
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#ifdef UNION_DIAGNOSTIC
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printf("union_unmount(mp = %p)\n", mp);
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#endif
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/*
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* Keep flushing vnodes from the mount list.
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* This is needed because of the un_pvp held
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* reference to the parent vnode.
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* If more vnodes have been freed on a given pass,
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* the try again. The loop will iterate at most
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* (d) times, where (d) is the maximum tree depth
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* in the filesystem.
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*/
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for (freeing = 0; (error = vflush(mp, NULL, 0)) != 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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for (n = 0, vp = mp->mnt_vnodelist.lh_first;
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vp != NULLVP;
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vp = vp->v_mntvnodes.le_next)
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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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/*
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* Ok, now that we've tried doing it gently, get out the hammer.
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*/
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if (mntflags & MNT_FORCE)
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error = vflush(mp, NULL, FORCECLOSE);
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if (error)
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return error;
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/*
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* Discard references to upper and lower target vnodes.
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*/
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if (um->um_lowervp)
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vrele(um->um_lowervp);
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vrele(um->um_uppervp);
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kauth_cred_free(um->um_cred);
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/*
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* Finally, throw away the union_mount 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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int
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union_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 union_mount *um = MOUNTTOUNIONMOUNT(mp);
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int error;
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int loselock;
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/*
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* Return locked reference to root.
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*/
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VREF(um->um_uppervp);
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if ((um->um_op == UNMNT_BELOW) &&
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VOP_ISLOCKED(um->um_uppervp)) {
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loselock = 1;
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} else {
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vn_lock(um->um_uppervp, LK_EXCLUSIVE | LK_RETRY);
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loselock = 0;
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}
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if (um->um_lowervp)
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VREF(um->um_lowervp);
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error = union_allocvp(vpp, mp,
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(struct vnode *) 0,
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(struct vnode *) 0,
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(struct componentname *) 0,
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um->um_uppervp,
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um->um_lowervp,
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1);
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if (error) {
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if (!loselock)
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VOP_UNLOCK(um->um_uppervp, 0);
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vrele(um->um_uppervp);
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if (um->um_lowervp)
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vrele(um->um_lowervp);
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} else {
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if (loselock)
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VTOUNION(*vpp)->un_flags &= ~UN_ULOCK;
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}
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return (error);
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}
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/*ARGSUSED*/
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int
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union_quotactl(mp, cmd, uid, arg, l)
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struct mount *mp;
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int cmd;
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uid_t uid;
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void *arg;
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struct lwp *l;
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{
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return (EOPNOTSUPP);
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}
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int
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union_statvfs(mp, sbp, l)
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struct mount *mp;
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struct statvfs *sbp;
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struct lwp *l;
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{
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int error;
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struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
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struct statvfs *sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK | M_ZERO);
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unsigned long lbsize;
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#ifdef UNION_DIAGNOSTIC
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printf("union_statvfs(mp = %p, lvp = %p, uvp = %p)\n", mp,
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um->um_lowervp, um->um_uppervp);
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#endif
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if (um->um_lowervp) {
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error = VFS_STATVFS(um->um_lowervp->v_mount, sbuf, l);
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if (error)
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goto done;
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}
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/* now copy across the "interesting" information and fake the rest */
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lbsize = sbuf->f_bsize;
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sbp->f_blocks = sbuf->f_blocks - sbuf->f_bfree;
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sbp->f_files = sbuf->f_files - sbuf->f_ffree;
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error = VFS_STATVFS(um->um_uppervp->v_mount, sbuf, l);
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if (error)
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goto done;
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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_frsize = sbuf->f_frsize;
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sbp->f_iosize = sbuf->f_iosize;
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/*
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* The "total" fields count total resources in all layers,
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* the "free" fields count only those resources which are
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* free in the upper layer (since only the upper layer
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* is writable).
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*/
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if (sbuf->f_bsize != lbsize)
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sbp->f_blocks = 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_bresvd = sbuf->f_bresvd;
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sbp->f_files += sbuf->f_files;
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sbp->f_ffree = sbuf->f_ffree;
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sbp->f_favail = sbuf->f_favail;
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sbp->f_fresvd = sbuf->f_fresvd;
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copy_statvfs_info(sbp, mp);
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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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/*ARGSUSED*/
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int
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union_sync(mp, waitfor, cred, l)
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struct mount *mp;
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int waitfor;
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kauth_cred_t cred;
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struct lwp *l;
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{
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/*
|
|
* XXX - Assumes no data cached at union layer.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
union_vget(mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
SYSCTL_SETUP(sysctl_vfs_union_setup, "sysctl vfs.union subtree setup")
|
|
{
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "vfs", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_VFS, CTL_EOL);
|
|
sysctl_createv(clog, 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
|
|
*/
|
|
}
|
|
|
|
extern const struct vnodeopv_desc union_vnodeop_opv_desc;
|
|
|
|
const struct vnodeopv_desc * const union_vnodeopv_descs[] = {
|
|
&union_vnodeop_opv_desc,
|
|
NULL,
|
|
};
|
|
|
|
struct vfsops union_vfsops = {
|
|
MOUNT_UNION,
|
|
union_mount,
|
|
union_start,
|
|
union_unmount,
|
|
union_root,
|
|
union_quotactl,
|
|
union_statvfs,
|
|
union_sync,
|
|
union_vget,
|
|
NULL, /* vfs_fhtovp */
|
|
NULL, /* vfs_vptofh */
|
|
union_init,
|
|
NULL, /* vfs_reinit */
|
|
union_done,
|
|
NULL, /* vfs_mountroot */
|
|
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
|
|
vfs_stdextattrctl,
|
|
union_vnodeopv_descs,
|
|
};
|
|
VFS_ATTACH(union_vfsops);
|