/* $NetBSD: layer_vfsops.c,v 1.1 1999/07/08 01:19:01 wrstuden Exp $ */ /* * Copyright (c) 1999 National Aeronautics & Space Administration * All rights reserved. * * This software was written by William Studenmund of the * Numerical Aerospace Similation Facility, NASA Ames Research Center. * * 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 the name of the National Aeronautics & Space Administration * 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 NATIONAL AERONAUTICS & SPACE ADMINISTRATION * ``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 ADMINISTRATION OR CONTRIB- * UTORS 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. */ /* * Copyright (c) 1992, 1993, 1995 * 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. * * from: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp * from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92 * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95 */ /* * generic layer vfs ops. */ #include #include #include #include #include #include #include #include #include #include #include /* * VFS start. Nothing needed here - the start routine * on the underlying filesystem will have been called * when that filesystem was mounted. */ int layerfs_start(mp, flags, p) struct mount *mp; int flags; struct proc *p; { return (0); /* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, p); */ } int layerfs_root(mp, vpp) struct mount *mp; struct vnode **vpp; { struct vnode *vp; #ifdef LAYERFS_DIAGNOSTIC printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp, MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); #endif /* * Return locked reference to root. */ vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp; if (vp == NULL) { *vpp = NULL; return (EINVAL); } VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); *vpp = vp; return 0; } int layerfs_quotactl(mp, cmd, uid, arg, p) struct mount *mp; int cmd; uid_t uid; caddr_t arg; struct proc *p; { return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, cmd, uid, arg, p); } int layerfs_statfs(mp, sbp, p) struct mount *mp; struct statfs *sbp; struct proc *p; { int error; struct statfs mstat; #ifdef LAYERFS_DIAGNOSTIC printf("layerfs_statfs(mp = %p, vp = %p->%p)\n", mp, MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); #endif memset(&mstat, 0, sizeof(mstat)); error = VFS_STATFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, &mstat, p); 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; if (sbp != &mp->mnt_stat) { memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); } strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); return (0); } int layerfs_sync(mp, waitfor, cred, p) struct mount *mp; int waitfor; struct ucred *cred; struct proc *p; { /* * XXX - Assumes no data cached at layer. */ return (0); } int layerfs_vget(mp, ino, vpp) struct mount *mp; ino_t ino; struct vnode **vpp; { int error; struct vnode *vp; if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp))) { *vpp = NULL; return (error); } if ((error = layer_node_create(mp, vp, vpp))) { vput(vp); *vpp = NULL; return (error); } return (0); } int layerfs_fhtovp(mp, fidp, vpp) struct mount *mp; struct fid *fidp; struct vnode **vpp; { int error; struct vnode *vp; if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp))) return (error); if ((error = layer_node_create(mp, vp, vpp))) { vput(vp); *vpp = NULL; return (error); } return (0); } int layerfs_checkexp(mp, nam, exflagsp, credanonp) struct mount *mp; struct mbuf *nam; int *exflagsp; struct ucred**credanonp; { struct netcred *np; struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp); /* * get the export permission structure for this tuple. */ if ((np = vfs_export_lookup(mp, &lmp->layerm_export, nam)) == NULL) return (EACCES); *exflagsp = np->netc_exflags; *credanonp = &np->netc_anon; return (0); } int layerfs_vptofh(vp, fhp) struct vnode *vp; struct fid *fhp; { return (VFS_VPTOFH(LAYERVPTOLOWERVP(vp), fhp)); } int layerfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { return (EOPNOTSUPP); }