6ac84ba2f8
VFCF_NETWORK (this FS goes over the net) VFCF_READONLY (read-write mounts do not make any sense) VFCF_SYNTHETIC (data in this FS is not real) VFCF_LOOPBACK (this FS aliases something else) cd9660 is readonly; nullfs, umapfs, and union are loopback; NFS is netowkr; procfs, kernfs, and fdesc are synthetic.
414 lines
9.6 KiB
C
414 lines
9.6 KiB
C
/*
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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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* the UCLA Ficus project.
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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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* @(#)umap_vfsops.c 8.3 (Berkeley) 1/21/94
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*
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* $Id: umap_vfsops.c,v 1.6 1995/03/16 18:13:55 bde Exp $
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*/
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/*
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* Umap Layer
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* (See mount_umap(8) for a description of this layer.)
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/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/umapfs/umap.h>
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/*
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* Mount umap layer
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*/
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int
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umapfs_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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struct umap_args args;
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struct vnode *lowerrootvp, *vp;
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struct vnode *umapm_rootvp;
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struct umap_mount *amp;
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u_int size;
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int error;
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#ifdef UMAPFS_DIAGNOSTIC
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printf("umapfs_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(MOUNTTOUMAPMOUNT(mp)->umapm_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 umap_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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error = namei(ndp);
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if (error)
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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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#ifdef UMAPFS_DIAGNOSTIC
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printf("vp = %x, check for VDIR...\n", lowerrootvp);
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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 (lowerrootvp->v_type != VDIR) {
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vput(lowerrootvp);
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return (EINVAL);
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}
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#ifdef UMAPFS_DIAGNOSTIC
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printf("mp = %x\n", mp);
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#endif
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amp = (struct umap_mount *) malloc(sizeof(struct umap_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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amp->umapm_vfs = lowerrootvp->v_mount;
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/*
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* Now copy in the number of entries and maps for umap mapping.
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*/
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amp->info_nentries = args.nentries;
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amp->info_gnentries = args.gnentries;
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error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
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2*sizeof(u_long)*args.nentries);
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if (error)
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return (error);
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#ifdef UMAP_DIAGNOSTIC
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printf("umap_mount:nentries %d\n",args.nentries);
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for (i = 0; i < args.nentries; i++)
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printf(" %d maps to %d\n", amp->info_mapdata[i][0],
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amp->info_mapdata[i][1]);
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#endif
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error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
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2*sizeof(u_long)*args.nentries);
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if (error)
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return (error);
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#ifdef UMAP_DIAGNOSTIC
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printf("umap_mount:gnentries %d\n",args.gnentries);
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for (i = 0; i < args.gnentries; i++)
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printf(" group %d maps to %d\n",
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amp->info_gmapdata[i][0],
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amp->info_gmapdata[i][1]);
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#endif
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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 = umap_node_create(mp, lowerrootvp, &vp);
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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(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 umapfs_unmount.
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*/
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umapm_rootvp = vp;
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umapm_rootvp->v_flag |= VROOT;
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amp->umapm_rootvp = umapm_rootvp;
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if (UMAPVPTOLOWERVP(umapm_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 UMAPFS_DIAGNOSTIC
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printf("umapfs_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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umapfs_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(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
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}
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/*
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* Free reference to umap layer
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*/
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int
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umapfs_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 *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
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int error;
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int flags = 0;
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#ifdef UMAPFS_DIAGNOSTIC
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printf("umapfs_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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#ifdef notyet
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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 (umapm_rootvp->v_usecount > 1)
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return (EBUSY);
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error = vflush(mp, umapm_rootvp, flags);
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if (error)
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return (error);
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#ifdef UMAPFS_DIAGNOSTIC
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vprint("alias root of lower", umapm_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(umapm_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(umapm_rootvp);
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/*
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* Finally, throw away the umap_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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umapfs_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 UMAPFS_DIAGNOSTIC
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printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp,
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MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_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 = MOUNTTOUMAPMOUNT(mp)->umapm_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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umapfs_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(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
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}
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int
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umapfs_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 UMAPFS_DIAGNOSTIC
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printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp,
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MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
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UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_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(MOUNTTOUMAPMOUNT(mp)->umapm_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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return (0);
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}
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int
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umapfs_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 umap layer.
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*/
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return (0);
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}
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int
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umapfs_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(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
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}
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int
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umapfs_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 (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, nam, vpp, exflagsp,credanonp));
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}
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int
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umapfs_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(UMAPVPTOLOWERVP(vp), fhp));
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}
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int umapfs_init __P((void));
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struct vfsops umap_vfsops = {
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umapfs_mount,
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umapfs_start,
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umapfs_unmount,
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umapfs_root,
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umapfs_quotactl,
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umapfs_statfs,
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umapfs_sync,
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umapfs_vget,
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umapfs_fhtovp,
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umapfs_vptofh,
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umapfs_init,
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};
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VFS_SET(umap_vfsops, umap, MOUNT_UMAP, VFCF_LOOPBACK);
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