/* $NetBSD: umap_vfsops.c,v 1.53 2005/05/29 21:55:34 christos Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * the UCLA Ficus project. * * 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. 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. * * from: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95 */ /* * Umap Layer * (See mount_umap(8) for a description of this layer.) */ #include __KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.53 2005/05/29 21:55:34 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include int umapfs_mount __P((struct mount *, const char *, void *, struct nameidata *, struct proc *)); int umapfs_unmount __P((struct mount *, int, struct proc *)); /* * Mount umap layer */ int umapfs_mount(mp, path, data, ndp, p) struct mount *mp; const char *path; void *data; struct nameidata *ndp; struct proc *p; { struct umap_args args; struct vnode *lowerrootvp, *vp; struct umap_mount *amp; int error; #ifdef UMAPFS_DIAGNOSTIC int i; #endif if (mp->mnt_flag & MNT_GETARGS) { amp = MOUNTTOUMAPMOUNT(mp); if (amp == NULL) return EIO; args.la.target = NULL; vfs_showexport(mp, &args.la.export, &->umapm_export); args.nentries = amp->info_nentries; args.gnentries = amp->info_gnentries; return copyout(&args, data, sizeof(args)); } /* only for root */ if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return error; #ifdef UMAPFS_DIAGNOSTIC printf("umapfs_mount(mp = %p)\n", mp); #endif /* * Get argument */ error = copyin(data, &args, sizeof(struct umap_args)); if (error) return (error); /* * Update only does export updating. */ if (mp->mnt_flag & MNT_UPDATE) { amp = MOUNTTOUMAPMOUNT(mp); if (args.umap_target == 0) return (vfs_export(mp, &->umapm_export, &args.umap_export)); else return (EOPNOTSUPP); } /* * Find lower node */ NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, UIO_USERSPACE, args.umap_target, p); if ((error = namei(ndp)) != 0) return (error); /* * Sanity check on lower vnode */ lowerrootvp = ndp->ni_vp; #ifdef UMAPFS_DIAGNOSTIC printf("vp = %p, check for VDIR...\n", lowerrootvp); #endif if (lowerrootvp->v_type != VDIR) { vput(lowerrootvp); return (EINVAL); } #ifdef UMAPFS_DIAGNOSTIC printf("mp = %p\n", mp); #endif amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), M_UFSMNT, M_WAITOK); /* XXX */ memset(amp, 0, sizeof(struct umap_mount)); mp->mnt_data = amp; mp->mnt_leaf = lowerrootvp->v_mount->mnt_leaf; amp->umapm_vfs = lowerrootvp->v_mount; if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) mp->mnt_flag |= MNT_LOCAL; /* * Now copy in the number of entries and maps for umap mapping. */ if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { vput(lowerrootvp); return (error); } amp->info_nentries = args.nentries; amp->info_gnentries = args.gnentries; error = copyin(args.mapdata, amp->info_mapdata, 2*sizeof(u_long)*args.nentries); if (error) { vput(lowerrootvp); return (error); } #ifdef UMAPFS_DIAGNOSTIC printf("umap_mount:nentries %d\n",args.nentries); for (i = 0; i < args.nentries; i++) printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], amp->info_mapdata[i][1]); #endif error = copyin(args.gmapdata, amp->info_gmapdata, 2*sizeof(u_long)*args.gnentries); if (error) { vput(lowerrootvp); return (error); } #ifdef UMAPFS_DIAGNOSTIC printf("umap_mount:gnentries %d\n",args.gnentries); for (i = 0; i < args.gnentries; i++) printf("\tgroup %ld maps to %ld\n", amp->info_gmapdata[i][0], amp->info_gmapdata[i][1]); #endif /* * Make sure the mount point's sufficiently initialized * that the node create call will work. */ vfs_getnewfsid(mp); amp->umapm_size = sizeof(struct umap_node); amp->umapm_tag = VT_UMAP; amp->umapm_bypass = umap_bypass; amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ amp->umapm_vnodeop_p = umap_vnodeop_p; simple_lock_init(&->umapm_hashlock); amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, M_WAITOK, &->umapm_node_hash); /* * fix up umap node for root vnode. */ error = layer_node_create(mp, lowerrootvp, &vp); /* * Make sure the node alias worked */ if (error) { vput(lowerrootvp); free(amp, M_UFSMNT); /* XXX */ return (error); } /* * Unlock the node (either the lower or the alias) */ VOP_UNLOCK(vp, 0); /* * Keep a held reference to the root vnode. * It is vrele'd in umapfs_unmount. */ vp->v_flag |= VROOT; amp->umapm_rootvp = vp; error = set_statvfs_info(path, UIO_USERSPACE, args.umap_target, UIO_USERSPACE, mp, p); #ifdef UMAPFS_DIAGNOSTIC printf("umapfs_mount: lower %s, alias at %s\n", mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); #endif return error; } /* * Free reference to umap layer */ int umapfs_unmount(mp, mntflags, p) struct mount *mp; int mntflags; struct proc *p; { struct vnode *rtvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; int error; int flags = 0; #ifdef UMAPFS_DIAGNOSTIC printf("umapfs_unmount(mp = %p)\n", mp); #endif if (mntflags & MNT_FORCE) flags |= FORCECLOSE; /* * Clear out buffer cache. I don't think we * ever get anything cached at this level at the * moment, but who knows... */ #ifdef notyet mntflushbuf(mp, 0); if (mntinvalbuf(mp, 1)) return (EBUSY); #endif if (rtvp->v_usecount > 1) return (EBUSY); if ((error = vflush(mp, rtvp, flags)) != 0) return (error); #ifdef UMAPFS_DIAGNOSTIC vprint("alias root of lower", rtvp); #endif /* * Release reference on underlying root vnode */ vrele(rtvp); /* * And blow it away for future re-use */ vgone(rtvp); /* * Finally, throw away the umap_mount structure */ free(mp->mnt_data, M_UFSMNT); /* XXX */ mp->mnt_data = 0; return (0); } SYSCTL_SETUP(sysctl_vfs_umap_setup, "sysctl vfs.umap 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, "umap", SYSCTL_DESCR("UID/GID remapping file system"), NULL, 0, NULL, 0, CTL_VFS, 10, CTL_EOL); /* * XXX the "10" above could be dynamic, thereby eliminating * one more instance of the "number to vfs" mapping problem, * but "10" is the order as taken from sys/mount.h */ } extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { &umapfs_vnodeop_opv_desc, NULL, }; struct vfsops umapfs_vfsops = { MOUNT_UMAP, umapfs_mount, layerfs_start, umapfs_unmount, layerfs_root, layerfs_quotactl, layerfs_statvfs, layerfs_sync, layerfs_vget, layerfs_fhtovp, layerfs_vptofh, layerfs_init, NULL, layerfs_done, NULL, NULL, /* vfs_mountroot */ layerfs_checkexp, layerfs_snapshot, vfs_stdextattrctl, umapfs_vnodeopv_descs, }; VFS_ATTACH(umapfs_vfsops);