330 lines
8.3 KiB
C
330 lines
8.3 KiB
C
/* $NetBSD: umap_vfsops.c,v 1.77 2008/05/05 17:11:17 ad 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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* 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. 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: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92
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* @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
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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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.77 2008/05/05 17:11:17 ad 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/proc.h>
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#include <sys/time.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/kauth.h>
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#include <miscfs/umapfs/umap.h>
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#include <miscfs/genfs/layer_extern.h>
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VFS_PROTOS(umapfs);
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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, data_len)
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struct mount *mp;
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const char *path;
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void *data;
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size_t *data_len;
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{
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struct lwp *l = curlwp;
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struct nameidata nd;
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struct umap_args *args = data;
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struct vnode *lowerrootvp, *vp;
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struct umap_mount *amp;
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int error;
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#ifdef UMAPFS_DIAGNOSTIC
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int i;
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#endif
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if (*data_len < sizeof *args)
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return EINVAL;
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if (mp->mnt_flag & MNT_GETARGS) {
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amp = MOUNTTOUMAPMOUNT(mp);
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if (amp == NULL)
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return EIO;
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args->la.target = NULL;
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args->nentries = amp->info_nentries;
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args->gnentries = amp->info_gnentries;
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*data_len = sizeof *args;
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return 0;
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}
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/* only for root */
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if ((error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
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NULL)) != 0)
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return error;
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#ifdef UMAPFS_DIAGNOSTIC
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printf("umapfs_mount(mp = %p)\n", mp);
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#endif
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/*
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* Update is not supported
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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return EOPNOTSUPP;
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/*
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* Find lower node
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*/
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NDINIT(&nd, LOOKUP, FOLLOW|LOCKLEAF,
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UIO_USERSPACE, args->umap_target);
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if ((error = namei(&nd)) != 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 = nd.ni_vp;
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#ifdef UMAPFS_DIAGNOSTIC
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printf("vp = %p, check for VDIR...\n", lowerrootvp);
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#endif
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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 = %p\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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memset(amp, 0, sizeof(struct umap_mount));
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mp->mnt_data = amp;
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amp->umapm_vfs = lowerrootvp->v_mount;
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if (amp->umapm_vfs->mnt_flag & MNT_LOCAL)
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mp->mnt_flag |= MNT_LOCAL;
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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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if (args->nentries > MAPFILEENTRIES || args->gnentries > GMAPFILEENTRIES) {
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vput(lowerrootvp);
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return (error);
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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, amp->info_mapdata,
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2*sizeof(u_long)*args->nentries);
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if (error) {
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vput(lowerrootvp);
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return (error);
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}
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#ifdef UMAPFS_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(" %ld maps to %ld\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, amp->info_gmapdata,
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2*sizeof(u_long)*args->gnentries);
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if (error) {
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vput(lowerrootvp);
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return (error);
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}
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#ifdef UMAPFS_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("\tgroup %ld maps to %ld\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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* Make sure the mount point's sufficiently initialized
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* that the node create call will work.
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*/
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vfs_getnewfsid(mp);
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amp->umapm_size = sizeof(struct umap_node);
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amp->umapm_tag = VT_UMAP;
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amp->umapm_bypass = umap_bypass;
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amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */
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amp->umapm_vnodeop_p = umap_vnodeop_p;
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mutex_init(&->umapm_hashlock, MUTEX_DEFAULT, IPL_NONE);
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amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, true,
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&->umapm_node_hash);
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/*
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* fix up umap node for root vnode.
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*/
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error = layer_node_create(mp, lowerrootvp, &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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vput(lowerrootvp);
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hashdone(amp->umapm_node_hashtbl, HASH_LIST,
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amp->umapm_node_hash);
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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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* Unlock the node (either the lower or the alias)
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*/
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vp->v_vflag |= VV_ROOT;
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VOP_UNLOCK(vp, 0);
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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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amp->umapm_rootvp = vp;
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error = set_statvfs_info(path, UIO_USERSPACE, args->umap_target,
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UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
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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 error;
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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(struct mount *mp, int mntflags)
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{
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struct umap_mount *amp = MOUNTTOUMAPMOUNT(mp);
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struct vnode *rtvp = amp->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 = %p)\n", mp);
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#endif
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
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return (EBUSY);
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if ((error = vflush(mp, rtvp, flags)) != 0)
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return (error);
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#ifdef UMAPFS_DIAGNOSTIC
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vprint("alias root of lower", rtvp);
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#endif
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/*
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* Blow it away for future re-use
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*/
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vgone(rtvp);
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/*
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* Finally, throw away the umap_mount structure
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*/
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mutex_destroy(&->umapm_hashlock);
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hashdone(amp->umapm_node_hashtbl, HASH_LIST, amp->umapm_node_hash);
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free(amp, 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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SYSCTL_SETUP(sysctl_vfs_umap_setup, "sysctl vfs.umap subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "umap",
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SYSCTL_DESCR("UID/GID remapping file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 10, CTL_EOL);
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/*
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* XXX the "10" above could be dynamic, thereby eliminating
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* one more instance of the "number to vfs" mapping problem,
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* but "10" is the order as taken from sys/mount.h
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*/
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}
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extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc;
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const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = {
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&umapfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops umapfs_vfsops = {
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MOUNT_UMAP,
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sizeof (struct umap_args),
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umapfs_mount,
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layerfs_start,
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umapfs_unmount,
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layerfs_root,
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layerfs_quotactl,
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layerfs_statvfs,
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layerfs_sync,
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layerfs_vget,
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layerfs_fhtovp,
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layerfs_vptofh,
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layerfs_init,
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NULL,
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layerfs_done,
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NULL, /* vfs_mountroot */
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layerfs_snapshot,
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vfs_stdextattrctl,
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(void *)eopnotsupp, /* vfs_suspendctl */
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layerfs_renamelock_enter,
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layerfs_renamelock_exit,
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(void *)eopnotsupp,
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umapfs_vnodeopv_descs,
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0, /* vfs_refcount */
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{ NULL, NULL },
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};
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VFS_ATTACH(umapfs_vfsops);
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