+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
-/*
- * Copyright (c) 1992, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software donated to Berkeley by
- * Jan-Simon Pendry.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95
- *
- * @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
- */
-
-/*
- * Null Layer
- * (See null_vnops.c for a description of what this does.)
- */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/proc.h>
-#include <sys/kauth.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/vnode.h>
-#include <sys/mount_internal.h>
-#include <sys/namei.h>
-#include <sys/malloc.h>
-#include <miscfs/nullfs/null.h>
-
-/*
- * Mount null layer
- */
-static int
-nullfs_mount(mp, devvp, data, context)
- struct mount *mp;
- vnode_t devvp;
- user_addr_t data;
- vfs_context_t context;
-{
- int error = 0;
- struct user_null_args args;
- struct vnode *lowerrootvp, *vp;
- struct vnode *nullm_rootvp;
- struct null_mount *xmp;
- u_int size;
-
-#ifdef NULLFS_DIAGNOSTIC
- printf("nullfs_mount(mp = %x)\n", mp);
-#endif
-
- /*
- * Update is a no-op
- */
- if (mp->mnt_flag & MNT_UPDATE) {
- return (ENOTSUP);
- /* return VFS_MOUNT(MOUNTTONULLMOUNT(mp)->nullm_vfs, devvp, data, p);*/
- }
-
- /*
- * Get argument
- */
- if (vfs_context_is64bit(context)) {
- error = copyin(data, (caddr_t)&args, sizeof (args));
- }
- else {
- struct null_args temp;
- error = copyin(data, (caddr_t)&temp, sizeof (temp));
- args.target = CAST_USER_ADDR_T(temp.target);
- }
- if (error)
- return (error);
-
- /*
- * Find lower node
- */
- NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
- UIO_USERSPACE, args.target, context);
- if (error = namei(ndp))
- return (error);
- nameidone(ndp);
- /*
- * Sanity check on lower vnode
- */
- lowerrootvp = ndp->ni_vp;
-
- vnode_put(ndp->ni_dvp);
- ndp->ni_dvp = NULL;
-
- xmp = (struct null_mount *) _MALLOC(sizeof(struct null_mount),
- M_UFSMNT, M_WAITOK); /* XXX */
-
- /*
- * Save reference to underlying FS
- */
- xmp->nullm_vfs = lowerrootvp->v_mount;
-
- /*
- * Save reference. Each mount also holds
- * a reference on the root vnode.
- */
- error = null_node_create(mp, lowerrootvp, &vp);
- /*
- * Make sure the node alias worked
- */
- if (error) {
- vnode_put(lowerrootvp);
- FREE(xmp, M_UFSMNT); /* XXX */
- return (error);
- }
-
- /*
- * Keep a held reference to the root vnode.
- * It is vnode_put'd in nullfs_unmount.
- */
- nullm_rootvp = vp;
- nullm_rootvp->v_flag |= VROOT;
- xmp->nullm_rootvp = nullm_rootvp;
- if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
- mp->mnt_flag |= MNT_LOCAL;
- mp->mnt_data = (qaddr_t) xmp;
- vfs_getnewfsid(mp);
-
- (void) copyinstr(args.target, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1,
- &size);
- bzero(mp->mnt_vfsstat.f_mntfromname + size, MNAMELEN - size);
-#ifdef NULLFS_DIAGNOSTIC
- printf("nullfs_mount: lower %s, alias at %s\n",
- mp->mnt_vfsstat.f_mntfromname, mp->mnt_vfsstat.f_mntonname);
-#endif
- return (0);
-}
-
-/*
- * VFS start. Nothing needed here - the start routine
- * on the underlying filesystem will have been called
- * when that filesystem was mounted.
- */
-static int
-nullfs_start(mp, flags, context)
- struct mount *mp;
- int flags;
- vfs_context_t context;
-{
- return (0);
- /* return VFS_START(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, context); */
-}
-
-/*
- * Free reference to null layer
- */
-static int
-nullfs_unmount(mp, mntflags, context)
- struct mount *mp;
- int mntflags;
- vfs_context_t context;
-{
- struct vnode *nullm_rootvp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
- int error;
- int flags = 0;
- int force = 0;
-
-#ifdef NULLFS_DIAGNOSTIC
- printf("nullfs_unmount(mp = %x)\n", mp);
-#endif
-
- if (mntflags & MNT_FORCE) {
- flags |= FORCECLOSE;
- force = 1;
- }
-
- if ( (nullm_rootvp->v_usecount > 1) && !force )
- return (EBUSY);
- if ( (error = vflush(mp, nullm_rootvp, flags)) && !force )
- return (error);
-
-#ifdef NULLFS_DIAGNOSTIC
- vprint("alias root of lower", nullm_rootvp);
-#endif
- /*
- * Release reference on underlying root vnode
- */
- vnode_put(nullm_rootvp);
- /*
- * And blow it away for future re-use
- */
- vnode_reclaim(nullm_rootvp);
- /*
- * Finally, throw away the null_mount structure
- */
- FREE(mp->mnt_data, M_UFSMNT); /* XXX */
- mp->mnt_data = 0;
- return 0;
-}
-
-static int
-nullfs_root(mp, vpp, context)
- struct mount *mp;
- struct vnode **vpp;
- vfs_context_t context;
-{
- struct proc *p = curproc; /* XXX */
- struct vnode *vp;
-
-#ifdef NULLFS_DIAGNOSTIC
- printf("nullfs_root(mp = %x, vp = %x->%x)\n", mp,
- MOUNTTONULLMOUNT(mp)->nullm_rootvp,
- NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
- );
-#endif
-
- /*
- * Return locked reference to root.
- */
- vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
- vnode_get(vp);
- *vpp = vp;
- return 0;
-}
-
-static int
-nullfs_quotactl(mp, cmd, uid, datap, context)
- struct mount *mp;
- int cmd;
- uid_t uid;
- caddr_t datap;
- vfs_context_t context;
-{
- return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, datap, context);
-}
-
-static int
-nullfs_statfs(mp, sbp, context)
- struct mount *mp;
- struct vfsstatfs *sbp;
- vfs_context_t context;
-{
- int error;
- struct vfsstatfs mstat;
-
-#ifdef NULLFS_DIAGNOSTIC
- printf("nullfs_statfs(mp = %x, vp = %x->%x)\n", mp,
- MOUNTTONULLMOUNT(mp)->nullm_rootvp,
- NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
- );
-#endif
-
- bzero(&mstat, sizeof(mstat));
-
- error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_vfs, &mstat, context);
- if (error)
- return (error);
-
- /* now copy across the "interesting" information and fake the rest */
- //sbp->f_type = mstat.f_type;
- sbp->f_flags = mstat.f_flags;
- sbp->f_bsize = mstat.f_bsize;
- sbp->f_iosize = mstat.f_iosize;
- sbp->f_blocks = mstat.f_blocks;
- sbp->f_bfree = mstat.f_bfree;
- sbp->f_bavail = mstat.f_bavail;
- sbp->f_files = mstat.f_files;
- sbp->f_ffree = mstat.f_ffree;
- return (0);
-}
-
-static int
-nullfs_sync(__unused struct mount *mp, __unused int waitfor,
- __unused kauth_cred_t cred, __unused vfs_context_t context)
-{
- /*
- * XXX - Assumes no data cached at null layer.
- */
- return (0);
-}
-
-static int
-nullfs_vget(mp, ino, vpp, context)
- struct mount *mp;
- ino64_t ino;
- struct vnode **vpp;
- vfs_context_t context;
-{
-
- return VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, vpp, context);
-}
-
-static int
-nullfs_fhtovp(mp, fhlen, fhp, vpp, context)
- struct mount *mp;
- int fhlen;
- unsigned char *fhp;
- struct vnode **vpp;
- vfs_context_t context;
-{
-
- return VFS_FHTOVP(MOUNTTONULLMOUNT(mp)->nullm_vfs, fhlen, fhp, vpp, context);
-}
-
-static int
-nullfs_vptofh(vp, fhlenp, fhp, context)
- struct vnode *vp;
- int *fhlenp;
- unsigned char *fhp;
- vfs_context_t context;
-{
- return VFS_VPTOFH(NULLVPTOLOWERVP(vp), fhlenp, fhp, context);
-}
-
-int nullfs_init (struct vfsconf *);
-
-#define nullfs_sysctl (int (*) (int *, u_int, user_addr_t, size_t *, user_addr_t, size_t, proc_t))eopnotsupp
-
-struct vfsops null_vfsops = {
- nullfs_mount,
- nullfs_start,
- nullfs_unmount,
- nullfs_root,
- nullfs_quotactl,
- nullfs_statfs,
- nullfs_sync,
- nullfs_vget,
- nullfs_fhtovp,
- nullfs_vptofh,
- nullfs_init,
- nullfs_sysctl
-};
projects / apple / xnu.git / blobdiff