90688fce27
'const char *', and 'void *', respectively. The second arg is taken directly from user arguments, and is const there, so must be const in the prototypes and functions. The third arg is also taken directly from user arguments. It doesn't have to be changed, but since it's cleaner to keep the type the same as the user arg's type, and I'm already making the 'const char *' change...
384 lines
9.3 KiB
C
384 lines
9.3 KiB
C
/* $NetBSD: null_vfsops.c,v 1.14 1996/12/22 10:10:23 cgd Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. 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: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp
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* from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
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* @(#)null_vfsops.c 8.2 (Berkeley) 1/21/94
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*/
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/*
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* Null Layer
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* (See null_vnops.c for a description of what this does.)
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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/nullfs/null.h>
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int nullfs_mount __P((struct mount *, const char *, void *,
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struct nameidata *, struct proc *));
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int nullfs_start __P((struct mount *, int, struct proc *));
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int nullfs_unmount __P((struct mount *, int, struct proc *));
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int nullfs_root __P((struct mount *, struct vnode **));
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int nullfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
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struct proc *));
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int nullfs_statfs __P((struct mount *, struct statfs *, struct proc *));
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int nullfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
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int nullfs_vget __P((struct mount *, ino_t, struct vnode **));
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int nullfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *,
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struct vnode **, int *, struct ucred **));
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int nullfs_vptofh __P((struct vnode *, struct fid *));
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/*
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* Mount null layer
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*/
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int
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nullfs_mount(mp, path, data, ndp, p)
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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 proc *p;
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{
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int error = 0;
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struct null_args args;
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struct vnode *lowerrootvp, *vp;
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struct vnode *nullm_rootvp;
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struct null_mount *xmp;
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size_t size;
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#ifdef NULLFS_DIAGNOSTIC
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printf("nullfs_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(MOUNTTONULLMOUNT(mp)->nullm_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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error = copyin(data, (caddr_t)&args, sizeof(struct null_args));
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if (error)
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return (error);
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/*
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* Find lower node
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*/
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NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
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UIO_USERSPACE, args.target, p);
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if ((error = namei(ndp)) != 0)
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return (error);
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/*
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* Sanity check on lower vnode
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*/
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lowerrootvp = ndp->ni_vp;
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vrele(ndp->ni_dvp);
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ndp->ni_dvp = NULL;
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xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
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M_UFSMNT, M_WAITOK); /* XXX */
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/*
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* Save reference to underlying FS
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*/
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xmp->nullm_vfs = lowerrootvp->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 = null_node_create(mp, lowerrootvp, &vp, 1);
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/*
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* Unlock the node (either the lower or the alias)
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*/
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VOP_UNLOCK(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(lowerrootvp);
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free(xmp, 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 nullfs_unmount.
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*/
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nullm_rootvp = vp;
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nullm_rootvp->v_flag |= VROOT;
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xmp->nullm_rootvp = nullm_rootvp;
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if (NULLVPTOLOWERVP(nullm_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) xmp;
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getnewfsid(mp, makefstype(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 NULLFS_DIAGNOSTIC
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printf("nullfs_mount: lower %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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int
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nullfs_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(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, p); */
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}
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/*
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* Free reference to null layer
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*/
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int
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nullfs_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 *nullm_rootvp = MOUNTTONULLMOUNT(mp)->nullm_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 NULLFS_DIAGNOSTIC
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printf("nullfs_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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#if 0
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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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#endif
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if (nullm_rootvp->v_usecount > 1)
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return (EBUSY);
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if ((error = vflush(mp, nullm_rootvp, flags)) != 0)
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return (error);
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#ifdef NULLFS_DIAGNOSTIC
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vprint("alias root of lower", nullm_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(nullm_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(nullm_rootvp);
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/*
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* Finally, throw away the null_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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nullfs_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 NULLFS_DIAGNOSTIC
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printf("nullfs_root(mp = %x, vp = %x->%x)\n", mp,
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MOUNTTONULLMOUNT(mp)->nullm_rootvp,
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NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp));
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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 = MOUNTTONULLMOUNT(mp)->nullm_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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int
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nullfs_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(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, arg, p);
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}
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int
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nullfs_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 NULLFS_DIAGNOSTIC
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printf("nullfs_statfs(mp = %x, vp = %x->%x)\n", mp,
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MOUNTTONULLMOUNT(mp)->nullm_rootvp,
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NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp));
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#endif
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bzero(&mstat, sizeof(mstat));
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error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_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_bsize = mstat.f_bsize;
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sbp->f_iosize = mstat.f_iosize;
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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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strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
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return (0);
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}
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int
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nullfs_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* XXX - Assumes no data cached at null layer.
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*/
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return (0);
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}
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int
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nullfs_vget(mp, ino, vpp)
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struct mount *mp;
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ino_t ino;
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struct vnode **vpp;
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{
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return VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, vpp);
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}
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int
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nullfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
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struct mount *mp;
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struct fid *fidp;
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struct mbuf *nam;
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struct vnode **vpp;
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int *exflagsp;
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struct ucred**credanonp;
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{
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return (EOPNOTSUPP);
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}
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int
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nullfs_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 (EOPNOTSUPP);
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}
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struct vfsops null_vfsops = {
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MOUNT_NULL,
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nullfs_mount,
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nullfs_start,
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nullfs_unmount,
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nullfs_root,
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nullfs_quotactl,
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nullfs_statfs,
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nullfs_sync,
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nullfs_vget,
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nullfs_fhtovp,
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nullfs_vptofh,
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nullfs_init,
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};
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